Leno selvage forming apparatus for loom |
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申请号 | EP13002916.8 | 申请日 | 2013-06-06 | 公开(公告)号 | EP2674520A1 | 公开(公告)日 | 2013-12-18 |
申请人 | TSUDAKOMA KOGYO KABUSHIKI KAISHA; | 发明人 | Yamamura, Koji; | ||||
摘要 | A selvage forming apparatus (1) forms a leno selvage construction by using a first selvage yarn (16a, 16b) and a second selvage yarn (16c). The selvage forming apparatus (1) includes a selvage-yarn-path switching device (2) that moves a path of the first selvage yarn (16a, 16b) in a weaving-width direction and a selvage shedding device (3) that moves a path of the second selvage yarn (16c) in a top-bottom direction. The selvage-yarn-path switching device (2) includes a selvage-yarn guide member (5) having an eyelet (4) through which the first selvage yarn (16a, 16b) is inserted and a first drive device (8) that switches a position of the eyelet (4) between two positions that are on the left and right sides of the second selvage yarn (16c). The selvage shedding device (3) includes an engagement portion (9) that engages with the second selvage yarn (16c) and moves so as to move the path of the second selvage yarn (16c) in the top-bottom direction. The engagement portion (9) moves along a revolution path including positions at which the second selvage yarn (16c) is closer to the first drive device (8) than the eyelet (4) and farther from the first drive device (8) than a tip end of the selvage-yarn guide member (5) in the top-bottom direction at a position of the selvage-yarn guide member (5). | ||||||
权利要求 | |||||||
说明书全文 | The present invention relates to a selvage forming apparatus for a loom, the selvage forming apparatus forming a selvage construction by using at least two selvage yarns pulled from respective bobbins. Japanese Unexamined Patent Application Publication (Translation of PCT Application) No. This apparatus forms a so-called leno selvage construction by using three selvage yarns. The three selvage yarns include two twisting yarns and a single stationary yarn. A shed is formed by switching paths of the two twisting yarns and a path of the single stationary yarn in a top-down direction each time a weft insertion operation is performed. Positions of the two twisting yarns are switched in a left-right direction every other time the weft insertion operation is performed. Thus, the weft yarns are caught by the selvage yarns. To move the selvage yarns in the above-described manner, the apparatus according to Patent Document 1 includes a first swing device and a second swing device. The first swing device swings a single tube-shaped guide needle, which guides the stationary yarn, in the top-bottom direction. The second swing device swings two tube-shaped guide needles, which guide the respective twisting yarns, in the top-bottom direction and includes a rotating mechanism for switching the positions of the two guide needles by rotating the two guide needles around an axis parallel to the guide needles at an intermediate position between the two guide needles. In the apparatus according to Patent Document 1, the guide needle of the first swing device and the guide needles of the second swing device are swung in the top-bottom direction so that the guide needle of the first swing device is inserted between the two guide needles of the second swing device, thereby forming a first shed. After a weft yarn is inserted into the first shed, the guide needle of the first swing device is removed from between the two guide needles of the second swing device, so that a second shed is formed. The rotating mechanism rotates and switches the positions of the two guide needles of the second swing device at the position of the second shed, so that the paths of the two twisting yarns are switched in a weaving-width direction. Then, a weft yarn is inserted into the second shed. The apparatus according to Patent Document 1 forms the leno selvage construction by repeating the above-described processes. In the apparatus according to Patent Document 1, the guide needle of the first swing device and the guide needles of the second swing device are both swung in the top-bottom direction to cause the selvage yarns to form a shed. In the case where the components are reciprocated in this manner, load is applied to the drive devices owing to the influence of inertia when the moving directions (swing directions) of the components are reversed. The first swing device simply swings the guide needle thereof in the top-bottom direction, and the guide needle itself is light. Therefore, the load applied to the drive device is small when the amount by which the guide needle is swung is small. In contrast, the second swing device swings not only the two guide needles thereof but also the rotating mechanism in the top-bottom direction, and the influence of inertia of the rotating mechanism, which is heavy, is large. Therefore, a large load is applied to the drive device and there is a high possibility that the drive device for driving the second swing device will be damaged when the apparatus is driven continuously. In particular, when the rotation speed of a main shaft of the loom is increased, the load applied to the drive device is also increased owing to the influence of inertia, and the drive device is more easily damaged. Therefore, the speed of the loom including the apparatus according to Patent Document 1 cannot be increased. In the apparatus according to Patent Document 1, the above-described damage to the drive device owing to the inertia may be suppressed when the second swing device including the rotating mechanism is configured to not perform the swinging operation in the top-bottom direction. More specifically, the second swing device may be configured such that the guide needles thereof are only rotated by the rotating mechanism, and the shed may be formed mainly by swinging the guide needle of the first swing device. However, to form the shed only by the swing movement of the guide needle of the first swing device, it is necessary to increase the swing angle of the first swing device in the top-bottom direction. To perform the shedding motion only by the swinging operation of the first swing device within a period required to perform the shedding motion when both the first and second swing devices perform the swinging operation, it is necessary to increase the swing speed of the first swing device. As a result, the above-described influence of the inertia on the drive device increases, and the load applied to the drive device that drives the first swing device increases accordingly. In this case, there is a high possibility that the drive device for driving the first swing device will be damaged. Therefore, also in this case, the speed of the loom including the apparatus cannot be used. Accordingly, an object of the present invention is to provide a selvage forming apparatus that can be used in a high-speed loom. To achieve the above-described object, according to the present invention, a selvage forming apparatus for a loom, which forms a selvage construction by using at least two selvage yarns which are pulled from respective bobbins and include a first selvage yarn and a second selvage yarn, is configured as follows. That is, the selvage forming apparatus for the loom includes a selvage-yarn-path switching device disposed on a warp let-off side of a cloth fell in a warp direction and a selvage shedding device disposed on the warp let-off side of the selvage-yarn-path switching device in the warp direction. The selvage-yarn-path switching device includes a selvage-yarn guide member that is rod-shaped and extends at least in a top-bottom direction, the selvage-yarn guide member having an eyelet, through which the first selvage yarn is inserted, at a tip end thereof; a support member that is fixedly arranged with respect to a frame of the loom; a displacement member that supports the selvage-yarn guide member and that is supported by the support member so as to be movable with respect to the frame of the loom so that a position of the selvage-yarn guide member in a weaving-width direction is capable of being switched; and a first drive device that is fixedly arranged with respect to the frame of the loom and connected to the displacement member, the first drive device driving the displacement member so as to periodically switch a position of the eyelet between two positions that are on a warp row side of and a side opposite the warp row side of the second selvage yarn in the weaving-width direction. The selvage shedding device includes a rotary member that is fixedly arranged with respect to the frame of the loom so as to be rotatable around a rotation axis that extends in a direction that crosses the top-bottom direction, the rotary member including an engagement portion that is separated from the rotation axis and that engages with the second selvage yarn to move a path of the second selvage yarn; and a second drive device that rotationally drives the rotary member continuously in one direction around the rotation axis. The selvage shedding device is configured so that, when the second drive device rotationally drives the rotary member, the engagement portion is moved along a revolution path including a position at which the path of the second selvage yarn is closer to the first drive device than the eyelet in the top-bottom direction at least at a position of the selvage-yarn guide member in the warp direction, and a position at which the path of the second selvage yarn is farther from the first drive device than the tip end of the selvage-yarn guide member in the top-bottom direction at least at the position of the selvage-yarn guide member in the warp direction. With regard to the "selvage-yarn guide member", "extends at least in a top-bottom direction" means that the extending direction of the selvage-yarn guide member is not limited to the top-bottom direction. As long as the extending direction includes a component in the top-bottom direction, as in the case where, for example, the extending direction is inclined or bent, the path of the first selvage yarn may be moved in the weaving-width direction and switched with respect to the path of the second selvage yarn that moves in the top-bottom direction. Therefore, all of such directions are included. In addition, "fixedly arranged" means that the arrangement of the member is fixed, irrespective of whether the member is rotatable or non-rotatable in that arrangement. With regard to the "displacement member", "supported by the support member so as to be movable with respect to the frame of the loom" means that both a case in which the displacement member is fixedly supported by the support member and is moved by a movement of the support member and a case in which the displacement member is movably supported by the support member are included. With regard to the "rotary member", "rotation axis that extends in a direction that crosses the top-bottom direction" means that cases in which the rotation axis of the rotary member extends in all directions other than the vertical direction are included. As long as the direction of the rotation axis of the rotary member is not the vertical direction, the engagement portion can be moved in the top-bottom direction by rotationally driving the rotary member, so that the engagement portion can move and switch the path of the second selvage yarn with respect to the path of the first selvage yarn in the top-bottom direction. Therefore, the cases in which the rotation axis extends in all of these directions are included. In the selvage forming apparatus according to the present invention, the rotary member may include a main body that is rotationally driven by the second drive device, and an engagement pin that serves as the engagement portion and projects from the main body toward the warp row side in the weaving-width direction, the engagement pin engaging with the second selvage yarn at one side of the second selvage yarn in the top-bottom direction and switching the path of the second selvage yarn by moving the path of the second selvage yarn from one side to the other side of a path of the first selvage yarn. The rotary member may further include a balancer at a position symmetrical to the engagement pin about the rotation axis. At least a part of the rotary member may be disposed at a position of a heald frame in the warp direction. The selvage forming apparatus may further include a regulating member that is disposed at a position closer to the cloth fell than the selvage shedding device in the warp direction and that regulates the path of the second selvage yarn in the weaving-width direction. The second drive device may rotationally drive the rotary member in a rotation direction such that, in a period in which the second selvage yarn is moved in a direction for forming a shed between the second selvage yarn and the first selvage yarn in the top-bottom direction, that is, in a direction toward the first drive device in the top-bottom direction, the engagement portion is moved along a part of the revolution path that is closer to the cloth fell than a vertical line that passes though the rotation axis of the rotary member. In the selvage forming apparatus for the loom according to the present invention, the selvage shedding device includes the rotary member including the engagement portion that is separated from the rotation axis in a radial direction and the second drive device that rotationally drives the rotary member continuously in one direction around the rotation axis. The second drive device rotationally drives the rotary member so that the engagement portion moves the path of the second selvage yarn in the top-bottom direction and switches the path of the second selvage yarn with respect to the path of the first selvage yarn. Therefore, compared to the structure according to the related art in which the shed is formed by the reciprocating motion of the swing devices, the load applied to the second drive device can be reduced by a large amount. Accordingly, the possibility that the second drive device will be damaged can be reduced. In addition, the second drive device can rotate a rotating shaft at a high speed, so that the selvage shedding apparatus can be operated at a high speed. Therefore, the selvage forming apparatus can be used in a high-speed loom. In the case where the engagement portion of the rotary member is formed as the engagement pin that projects from the main body of the rotary member toward the warp row side in the weaving-width direction, the engagement pin can be caused to engage with the second selvage yarn at one side of the second selvage yarn in the top-bottom direction and move the path of the second selvage yarn toward the other side, thereby switching the path of the second selvage yarn in the top-bottom direction. Owing to the engagement pin, unlike the case in which, for example, the engagement portion has an eyelet that extends through the engagement portion in the weaving-width direction of the rotary member and the second selvage yarn is inserted through the eyelet, the path of the second selvage yarn is not bent by a large amount in the weaving-width direction. Therefore, excessive variation in the tension of the second selvage yarn can be suppressed and an appropriate selvage construction can be formed. More specifically, when the engagement portion is moved along the revolution path, the engagement portion moves not only in the top-bottom direction but also in the warp direction, and the length of the path of the second selvage yarn from the cloth fell to the engagement portion varies accordingly. In this case, when, for example, the engagement portion has an eyelet that extends through the engagement portion in the weaving-width direction of the rotary member and the second selvage yarn is inserted through the eyelet, the second selvage yarn is bent by a large amount in the weaving-width direction at the eyelet. Therefore, when the length of the path varies as described above, the tension of the second selvage yarn significantly varies owing to frictional resistance (bending resistance) at the bent portion. In the case where the engagement portion has the eyelet, the tension of the second selvage yarn may be reduced to suppress the excessive variation in the tension of the second selvage yarn. However, when the tension of the second selvage yarn is reduced, there may be a case in which an appropriate selvage construction cannot be formed. In contrast, in the case where the engagement portion of the rotary member is formed of the engagement pin and the engagement pin is engaged with the second selvage yarn at one side of the second selvage yarn in the top-bottom direction, the second selvage yarn can be guided to the cloth fell without being bent by a large amount in the weaving-width direction. Therefore, the frictional resistance applied between the engagement portion and the second selvage yarn can be reduced. Accordingly, even when the length of the path of the second selvage yarn varies as described above, the pulling force generated by the movement of the engagement pin does not easily act on the second selvage yarn and the excess variation in the tension of the second selvage yarn can be suppressed. Since the excess variation in the tension of the second selvage yarn can be suppressed without reducing the tension of the second selvage yarn, an appropriate selvage construction can be reliably formed. Since the variation in the tension of the second selvage yarn can be suppressed, the tension of the second selvage yarn can be easily adjusted. In addition, since the engagement pin engages with the second selvage yarn at one side of the second selvage yarn in the top-bottom direction, the operator can more easily connect the second selvage yarn to the engagement portion compared to the case in which the engagement portion has an eyelet that extends through the engagement portion in the weaving-width direction of the rotary member. In the case where the rotary member includes the balancer at a position symmetrical to the engagement pin about the rotation axis, a vibratory force generated by the rotation of the engagement pin around the rotation axis may be canceled by a vibratory force generated by the rotation of the balancer around the rotation axis, and vibration of the rotary member can be suppressed. Thus, the load applied to the second drive device owing to the vibration can be reduced, and the rotary member can be rotated by the second drive device at a high speed. Accordingly, the selvage forming apparatus can be used in a loom operated at a higher speed. In the case where at least a part of the rotary member is disposed at a position of the heald frame in the warp direction, the distance between the engagement portion and the cloth fell is reduced. Therefore, the swing angle of the path of the second selvage yarn (angle between the path of the second selvage yarn at the uppermost position and the path of the second selvage yarn at the lowermost position) can be increased without increasing the size (diameter) of the revolution path, that is, without increasing the size of the rotary member. Accordingly, the selvage forming apparatus can be used in a loom operated at a higher speed. More specifically, for example, when the size of the revolution path is constant, the angle between the line segment connecting the engagement portion to the cloth fell and the horizontal line decreases as the distance between the rotary member and the cloth fell increases. Therefore, the swing angle of the second selvage yarn is larger in the case where at least a part of the rotary member is disposed at a position of the heald frame in the warp direction than in the case where the rotary member is disposed at a position farther from the cloth fell than the position of the heald frame. In other words, in the case where the rotary member is disposed at a position farther from the cloth fell than the position of the heald frame, the size of the revolution path (rotary member) needs to be increased to set the swing angle to the above-described swing angle. The swing angle affects the size of the selvage shed. Therefore, when a selvage shed having a desired size is to be formed, the rotary member may be arranged such that at least a part thereof is disposed at the position of the heald frame in the warp direction, so that the selvage shed having the desired size can be formed without increasing the size of the revolution path. In such a case, the size of the rotary member that causes the second selvage yarn to perform the shedding motion can be reduced and the inertia of rotation of the rotary member can be reduced accordingly. As a result, the load applied to the second drive device owing to the inertia can be reduced, so that the selvage forming apparatus can be used in a high-speed loom. In the case where the selvage forming apparatus further includes the regulating member that is closer to the cloth fell than the selvage shedding device in the warp direction and that regulates the path of the second selvage yarn in the weaving-width direction, the position of the path of the second selvage yarn in the weaving-width direction can be maintained at a predetermined position at the position of the selvage-yarn guide member in the warp direction. Accordingly, the amount by which the displacement member is moved to periodically switch the path of the first selvage yarn between the two positions that are on the warp row side of and the side opposite the warp row side of the second selvage yarn in the weaving-width direction can be reduced. For example, the swing angle by which the selvage-yarn guide member is swung around the axis of a support shaft can be reduced. Thus, the time required to switch the path of the first selvage yarn can be reduced, so that the selvage forming apparatus can be used in a loom operated at a higher speed. In addition, since the swing angle of the selvage-yarn guide member can be reduced, the size of the first drive device can be reduced accordingly. In the case where the selvage forming apparatus includes the regulating member, the second drive device may rotationally drive the rotary member in a rotation direction such that, in a period in which the second selvage yarn is moved in the direction for forming the shed between the second selvage yarn and the first selvage yarn in the top-bottom direction, the engagement portion is moved along a part of the revolution path that is closer to the cloth fell than a vertical line that passes though the rotation axis of the rotary member. In this case, the length of the path of the second selvage yarn between the engagement portion and the regulating member in the above-described period is relatively small, and therefore the path of the second selvage yarn is not easily bent. Accordingly, even when the second selvage yarn slides along the regulating member and receives a frictional resistance, the second selvage yarn reliably follows the movement of the engagement portion. As a result, the period in which the selvage shed formed by the movement of the second selvage yarn toward the first drive device has a desired size can be increased. A selvage forming apparatus according to an embodiment of the present invention will now be described with reference to Bobbins 22 that feed selvage yarns 16 to the selvage forming apparatus 1 are disposed upstream of the selvage forming apparatus 1. The selvage forming apparatus 1 according to the present embodiment forms a three-yarn leno selvage construction by using three selvage yarns 16, which include two first selvage yarns 16a and 16b and a single second selvage yarn 16c. Accordingly, the bobbins 22 include two bobbins 22a and 22b for the first selvage yarns 16a and 16b, respectively, and a single bobbin 22c for the second selvage yarn 16c. Each of the three bobbins 22 is rotatably supported by a bobbin stand 23 that is fixedly arranged on a frame 20 of the loom. In the present embodiment, the bobbins 22 are located upstream of the selvage forming apparatus 1 in the warp direction. However, when the selvage yarns 16 pulled from the respective bobbins 22 are appropriately routed, the bobbins 22 may instead be located downstream of the selvage forming apparatus 1, and even be located downstream of a cloth fell 24 if possible. The selvage yarns 16 pulled from the bobbins 22 pass through a tenser device 25 that adjusts the tension applied to each selvage yarn 16, and are guided to the selvage forming apparatus 1 according to the embodiment of the present invention. Then, the selvage yarns 16 extend to the cloth fell 24 through between reed dents of a reed 29. The selvage forming apparatus 1 is supported at a location upstream of a heald frame group 28 by the frame 20 at the weft insertion side of the loom with a stand 30 provided therebetween. The stand 30 stands on a cross beam member 21 that extends between the frame 20 at the weft insertion side of the loom and a frame (not shown) at the weft arrival side of the loom. Each heald frame 28a included in the heald frame group 28 has a space for receiving the selvage forming apparatus 1 between a heald 28b that is closest to the cloth edge and a side frame 28c of the heald frame 28a. A part of the selvage forming apparatus 1 is inserted through that space from the upstream side so that the selvage forming apparatus 1 is disposed between the heald 28b closest to the cloth edge and the side frame 28c of the heald frame 28a in the weaving-width direction. The overall structure of the selvage forming apparatus 1 will now be described with reference to Referring to In the illustrated example, the selvage forming apparatus 1 includes plate-shaped guard members 33 that are provided on the support frame 32 at the side adjacent to the healds in order to prevent the selvage-yarn-path switching device 2 and the selvage shedding device 3 from contacting the heald 28b closest to the cloth edge (not shown). The guard members 33 are attached to the support frame 32 with respective stays (not shown) and bolts 34, and extend over a region in which the selvage-yarn-path switching device 2 and the selvage shedding device 3 are present in the warp direction. The selvage-yarn-path switching device 2 will be described in detail with reference to The main block 35 is a block-shaped member having a substantially rectangular parallelepiped shape, and has an opening 39 that opens in three side surfaces of the main block 35. The main block 35 has an angular U-shape with its open side facing rightward in side view. The main block 35 is fixed to a side surface of the support frame 32 illustrated in The main block 35 has bearing-receiving holes 41 that extend therethrough in the top-bottom direction with the opening 39 provided between the bearing-receiving holes 41. Bearings 42 are fitted to the respective bearing-receiving holes 41 such that the bearings 42 are separated from each other in the top-bottom direction with the opening 39 provided therebetween and rotation axes thereof extend in the top-bottom direction. The support shaft 36 is supported by the bearings 42 in the bearing-receiving holes 41 formed in the main block 35. Thus, the support shaft 36 is fixedly arranged with respect to the frame of the loom by the bearings 42 and the main block. The support shaft 36 is rotatably supported by the main block 35 such that the axis thereof extends in the top-bottom direction (in a direction that crosses the weaving-width direction). A part of the support shaft 36 is exposed to the outside at the opening 39 between the bearings 42. The support shaft 36 has a length that is greater than the height (dimension in the axial direction of the bearing-receiving holes 41) of the main block 35, and is assembled to the main block 35 so as to project from the top surface of the main block 35. The base member 37 is assembled to the portion of the support shaft 36 that projects from the main block 35 such that the base member 37 is not rotatable relative to the support shaft 36. Thus, the base member 37 is supported by the support shaft 36 such that the base member 37 is movable relative to the frame of the loom owing to the bearings 42. The base member 37 is a flat block-shaped member. Through holes 43a and 43b and a through hole 43c for receiving the two selvage-yarn guide rods 38a and 38b and the support shaft 36, respectively, are formed in the base member 37 so as to extend through the base member 37 in the thickness direction. As illustrated in As illustrated in The two selvage-yarn guide rods 38a and 38b have different lengths (dimensions in the direction in which they extend). In the illustrated example, the selvage-yarn guide rod 38b is shorter than the selvage-yarn guide rod 38a. More specifically, the lengths of the selvage-yarn guide rods 38a and 38b are set so that, in the state in which the two selvage-yarn guide rods 38a and 38b are assembled to the base member 37, the tip end of the selvage-yarn guide rod 38b is below the straight line that connects the bottom end of the eyelet 4 in the selvage-yarn guide rod 38a and the cloth fell 24 in the top-bottom direction. Therefore, as illustrated in Referring to As illustrated in A through hole 45c for receiving the support shaft 36 is formed in the swing block 45 so as to extend though the swing block 45 in the thickness direction. The center of the through hole 45c is positioned on the axis of symmetry 51. The portion of the support shaft 36 that is exposed at the opening 39 of the main block 35 is inserted through the through hole 45c, and the swing block 45 is fixed to the support shaft 36 such that the swing block 45 is not rotatable relative to the support shaft 36. Thus, the swing block 45 included in the first drive device 8 is connected to the base member 37 by the support shaft 36. Attachment holes 52 and 53 for the permanent magnets 46 and 47, respectively, are formed in the two oblique surfaces 45b of the swing block 45. The permanent magnets 46 and 47 are inserted into the attachment holes 52 and 53, respectively, in the swing block 45 and are fixed to the swing block 45 by means of, for example, an adhesive. The permanent magnets 46 and 47 have the same cylindrical shape, and are attached to the attachment holes 52 and 53, respectively, in the swing block 45 such that the polarities thereof are opposite to each other. The electromagnet 48 is housed in the electromagnet housing 49. The electromagnet housing 49 is fixed to an upstream side surface 54 of the main block 35 (among two side surfaces in a direction orthogonal to the width direction, the side surface in which the opening is formed). The electromagnet housing 49 has a substantially rectangular parallelepiped shape, and includes an attachment flange 55 at one end thereof in the longitudinal direction, as illustrated in A through hole 56 that receives the electromagnet 48 is formed in the electromagnet housing 49 so as to extend through the electromagnet housing 49 in the longitudinal direction, and the electromagnet 48 is fixedly arranged in the through hole 56. The polarity of the electromagnet 48 in an excited state is reversed when the direction in which current flows through a coil included in the electromagnet 48 is switched. When the polarity of the electromagnet 48 is reversed, the permanent magnets 46 and 47, which are arranged such that polarities thereof are opposite to each other, are alternately attracted to the electromagnet 48, so that the swing block 45 swings around the axis of the support shaft 36. The stopper member 50 is plate-shaped and is fixed to the bottom surface (downstream surface) of the opening 39 in the main block 35. The thickness of the stopper member 50 is set so that a gap that allows the swing block 45 to swing is formed between the stopper member 50 and the swing block 45, and so that the swing block 45 comes into contact with the stopper member 50 when the amount of swing movement of the swing block 45 reaches a predetermined amount. The swing motion of the swing block 45 based on the excitation of the electromagnet 48 is regulated by the stopper member 50 when the side surface 45a of the swing block 45 at the downstream side comes into contact with the stopper member 50. A swingable range of the swing block 45 is between a swing position (swing limit) at which a portion of the side surface 45a of the swing block 45 at the side opposite the warp row side comes into contact with the stopper member 50 and a swing position (swing limit) at which a portion of the side surface 45a of the swing block 45 at the warp row side comes into contact with the stopper member 50. The swing positions are determined by the above-described gap and the width of the swing block. In the selvage-yarn-path switching device 2 having the above-described structure, as illustrated in When the swing block 45 swings between the above-described two swing positions (swing limits), the base member 37 swings around the axis of the support shaft 36 (center of the through holes 43c and 45c) such that the position where the line segment L is at the angle α relative to the warp direction serves as a neutral position. When the swing block 45 swings by a maximum amount toward the side opposite the warp row side, a portion of the base member 37 on the warp row side of the support shaft 36 is at a most upstream position (state illustrated in When the base member 37 is at the above-described upstream swing limit (in the state illustrated in When the base member 37 is at the above-described downstream swing limit (in the state illustrated in The selvage shedding device 3 will now be described in detail with reference to The second drive device 11 according to the present embodiment is formed of a so-called direct-drive motor (hereinafter referred to as a DD motor). Referring to The rotary member 10 is assembled to the rotor 59b of the DD motor 58 such that the rotary member 10 is not rotatable relative to the rotor 59b. In the present embodiment, the rotary member 10 includes a main body 12 that is rotationally driven by the DD motor 58 and an engagement pin 13 that serves as the engagement portion 9 and that projects from the main body 12 toward the warp row side in the weaving-width direction. As illustrated in The engagement pin 13 is attached to the support stay 63 of the rotating disc 61. The engagement pin 13 guides the path of the second selvage yarn 16c in the top-bottom direction by engaging with the second selvage yarn 16c, and moves the path of the second selvage yarn 16c in the top-bottom direction. In the illustrated example, the engagement pin 13 is a round, rod-shaped member, and is provided with a flange portion 62 at the warp-row-side end thereof in the weaving-width direction to prevent the second selvage yarn 16c from being released. The engagement pin 13 is fixed to a side surface of the support stay 63 at the warp row side in the weaving-width direction such that an axis thereof extends in the weaving-width direction. When the main body 12 of the rotary member 10 is rotationally driven by the DD motor 58, the engagement pin 13 moves along a revolution path having the rotation axis 60 at the center. In the present embodiment, the selvage yarn guide 27, which will be described below, is disposed between the selvage shedding device 3 and the tenser device 25. The position of the path of the second selvage yarn 16c in the top-bottom direction in the state in which the engagement pin 13 is omitted (when it is assumed that the engagement pin 13 is not present) is determined by the vertical position of the selvage yarn guide 27 relative to the cloth fell 24 (straight line that extends through the guide position of the selvage yarn guide 27 and the cloth fell 24). In the present embodiment, the path of the second selvage yarn 16c determined by the selvage yarn guide 27 and the cloth fell 24 is such that when the component of the revolution of the engagement pin 13 in the top-bottom direction is upward, the second selvage yarn 16c is pushed upward from below by the engagement pin 13. When the component of the revolution of the engagement pin 13 in the top-bottom direction is downward, the second selvage yarn 16c moves downward so as to follow the downward movement of the engagement pin 13 owing to the tension of the second selvage yarn 16c. Therefore, as illustrated in Condition 1: Referring to Condition 2: Referring to As illustrated in The balancer stay 64 is a plate-shaped member having substantially the same weight and shape as those of the support stay 63. The balancer pin 65 is a round, rod-shaped member having substantially the same weight and shape as those of the engagement pin 13. The balancer pin 65 is arranged at a position symmetrical to the engagement pin 13 about the center of the rotating disc 61 (rotation axis 60 of the DD motor). The structure of the selvage shedding device 3 has been described. In the selvage shedding device 3, parts of the DD motor 58 and the rotary member 10 are disposed in a region in which the heald frames 28a are disposed in the warp direction. The reason for this is as follows. As illustrated in When the diameter of the revolution path of the engagement pin 13 (rotary member 10) is constant and the vertical positions of the first and second positions P1 and P2 in the top-bottom direction are also constant, the swing angle of the second selvage yarn 16c is determined by the distance from the cloth fell 24 to the first position P1 in the warp direction. Therefore, when the distance from the cloth fell 24 to the first and second positions P1 and P2 is large, the swing angle is small and a shed having a desired size for the weft insertion operation cannot be formed. The size of the shed may be increased by moving the center of the revolution path (center of the rotary member 10) to a lower position to move the first position P1 to a lower position. However, when the center of the revolution path is moved to a lower position, the second position P2 is also moved to a lower position, and Condition 2 cannot be satisfied. The size of the shed may also be increased by increasing the size of the revolution path, more specifically, by increasing the distance from the center of the rotary member 10 to the engagement pin 13 or increasing the diameter of the rotor 59b of the DD motor 58 or the rotary member 10. However, when the size of the revolution path is increased, the inertia of rotation of the engagement pin 13, the rotor 59b of the DD motor 58, and the main body 12 increases, and it becomes difficult to increase the speed of the loom. In addition, the size of the selvage shedding device 3 increases and the arrangement of the selvage forming apparatus 1 in the loom is limited. Accordingly, in the present embodiment, the selvage shedding device 3 is arranged such that a part thereof is positioned in a region in which the heald frames 28a are disposed, as illustrated in As described above, in the present embodiment, the selvage yarn guide 27 is provided between the selvage shedding device 3 and the tenser device 25. The second selvage yarn 16c engages with an upper portion of the engagement pin 13, and is guided to the cloth fell 24. The path of the second selvage yarn 16c is moved in the top-bottom direction by causing the second selvage yarn 16c to engage with the engagement pin 13, which moves in the top-bottom direction. Accordingly, the following condition needs to be satisfied to set the size of the shed formed by the second selvage yarn 16c at a maximum when the engagement pin 13 is at the first position P1. That is, the position of the path of the second selvage yarn 16c in the top-bottom direction in the state in which the engagement pin 13 is omitted (in the state in which the second selvage yarn 16c is directly guided from the selvage yarn guide 27 to the cloth fell 24) at the position of the selvage shedding device 3 needs to be below or at substantially the same level as the engagement pin 13 at the first position P1. In other words, the path of the second selvage yarn 16c needs to be below the selvage shedding device 3 in a region upstream of the selvage shedding device 3. In the present embodiment, as illustrated in The selvage yarn guide 27 is formed of a substantially cylindrical member, and is fixed to one of fixing holes 31a formed in a stay 31, which stands on the cross beam member 21, such that an axis thereof extends in the weaving-width direction. Thus, the selvage yarn guide 27 is fixedly arranged with respect to the frame of the loom. As illustrated in As illustrated in In the present embodiment, the selvage yarn guide 27 is also used to guide the first selvage yarns 16a and 16b. The selvage yarn guide 27 has not only the guide groove 66c but also guide grooves 66a and 66b for guiding the first selvage yarns 16a and 16b, respectively, in the peripheral surface thereof. The guide grooves 66a and 66b are on the side opposite the warp row side of the guide groove 66c in the axial direction of the selvage yarn guide 27, and on the side opposite the warp row side of the region in which the engagement pin 13 extends in the weaving-width direction. The three guide grooves 66b, 66a, and 66c for guiding the selvage yarns 16 are arranged in that order from the weft insertion side. The first selvage yarns 16b and 16a and the second selvage yarn 16c are guided by the respective three guide grooves in that order from the weft insertion side. The guide grooves regulate the paths of the respective selvage yarns 16 in the top-bottom direction and the weaving-width direction. In the present embodiment, the regulating member 15, which is disposed between the selvage shedding device 3 and the selvage-yarn-path switching device 2, regulates the path of the second selvage yarn 16c in the weaving-width direction. The regulating member 15 serves to maintain the path of the second selvage yarn 16c at a desired position in the weaving-width direction in a region near the selvage-yarn guide rods 38a and 38b included in the selvage-yarn-path switching device 2. The regulating member 15 will be described in more detail. As illustrated in Therefore, when the regulating member 15 is omitted and the second selvage yarn 16c is engaged with the engagement pin 13 while the second selvage yarn 16c is directly guided from the selvage yarn guide 27 to the cloth edge 19 at the cloth fell 24, the position of the second selvage yarn 16c with respect to the engagement pin 13 in the weaving-width direction differs between the state in which the engagement pin 13 is at the most downstream position and the state in which the engagement pin 13 is at the most upstream position. Accordingly, the second selvage yarn 16c reciprocates along the engagement pin 13 in the weaving-width direction, and the engagement between the second selvage yarn 16c and the engagement pin 13 becomes unstable. Therefore, there is a possibility that the second selvage yarn 16c will be released from the engagement pin 13 when the rotary member 10 (engagement pin 13) is continuously rotated. If the engagement pin 13 is configured so as to maintain the state in which the second selvage yarn 16c is engaged with the engagement pin 13, the second selvage yarn 16c can be prevented from being released from the engagement pin 13 as described above even when the regulating member 15 is not provided. Even in such a case, although the position of the cloth edge 19 at the cloth fell 24 is constant, the position of the engagement pin 13 moves forward and backward in the warp direction when the rotary member 10 (engagement pin 13) is continuously rotated. Therefore, the angle of the path of the second selvage yarn 16c between the engagement pin 13 and the cloth fell 24 with respect to the warp direction periodically changes, and the path of the second selvage yarn 16c between the engagement pin 13 and the cloth fell 24 vibrates (reciprocates) in the weaving-width direction. In this case, when, for example, the engagement pin 13 is moved from the second position P2 to the first position P1, the path of the second selvage yarn 16c varies while the engagement pin 13 is being moved, and there may be a case in which the second selvage yarn 16c cannot be properly guided into between the selvage-yarn guide rods 38a and 38b of the selvage-yarn-path switching device 2. Although this may be prevented by increasing the swing angle of the base member 37, there is a high possibility that the selvage forming apparatus cannot be used in a high-speed loom when the swing angle of the base member 37 is increased. Accordingly, in the present embodiment, the regulating member 15 is provided between the selvage shedding device 3 and the selvage-yarn-path switching device 2 to reduce the variation in the positional relationship between the engagement pin 13 and the second selvage yarn 16c caused by the rotation of the rotary member 10 and the vibration of the path of the second selvage yarn 16c in the weaving-width direction in a region downstream of (on the cloth fell side of) the selvage shedding device 3. As illustrated in As illustrated in In the selvage shedding device 3, the positional relationship between the engagement pin 13 and the path of the second selvage yarn 16c in the weaving-width direction is always constant while the rotary member 10 rotates, and the second selvage yarn 16c can be prevented from being released from the engagement pin 13 when the rotary member 10 continuously rotates. As described above, the path of the second selvage yarn 16c is parallel to the rotating disc 61 of the rotary member 10. Therefore, when the engagement pin 13 is rotated by the rotation of the main body 12, the second selvage yarn 16c does not move in the weaving-width direction, and moves only in the top-bottom direction. As a result, the above-described vibration of the second selvage yarn 16c does not occur in the region downstream of the selvage shedding device 3. Since the path of the second selvage yarn 16c between the selvage shedding device 3 and the selvage-yarn-path switching device 2 is regulated by the regulating member 15, the path of the second selvage yarn 16c between the regulating member 15 and the cloth fell 24 is at a constant position in the weaving-width direction. In the present embodiment, the path of the second selvage yarn 16c that is guided to the cloth fell 24 by the regulating member 15 is at the angle α (see In the present embodiment, as illustrated in The paths of the first selvage yarns 16a and 16b and the second selvage yarn 16c will now be described. In the weaving-width direction, the positional relationship between the paths of the selvage yarns 16 from the respective bobbins 22 to the selvage-yarn-path switching device 2 is constant, and the first selvage yarn 16b, the first selvage yarn 16a, and the second selvage yarn 16c are always arranged in that order from the side opposite the warp row side, as illustrated in In the top-bottom direction, referring to Referring to As illustrated in As illustrated in Similarly, the first selvage yarn 16b is pulled from the bobbin 22b and is guided to the selvage-yarn-path switching device 2 through the tenser device 25 and the guide groove 66b of the selvage yarn guide 27 in that order from the upstream side. The first selvage yarn 16b that is guided to the selvage-yarn-path switching device 2 is guided through a first selvage yarn guide 67b that is fixed to the support frame 32, a first selvage yarn guide 44b that is attached to the base member 37 of the selvage-yarn-path switching device 2, and the eyelet 4 in the selvage-yarn guide rod 38b, and extends to the cloth fell 24. In the illustrated example, the path of the first selvage yarn 16b is on the side opposite the warp row side of the path of the first selvage yarn 16a and is below the path of the first selvage yarn 16a. The first selvage yarn guides 67a and 67b are provided so that the paths of the first selvage yarns 16a and 16b that are guided from the selvage yarn guide 27 to the eyelets 4 in the selvage-yarn guide rods 38a and 38b are regulated to positions below the rotary member 10. The first selvage yarn guides 67a and 67b are fixedly arranged in a region between the rotary member 10 and the selvage-yarn-path switching device 2 in the warp direction. The reason why the paths of the first selvage yarns 16a and 16b are positioned below the rotary member 10 is as follows. That is, as illustrated in In the structure of the present embodiment, when the first selvage yarns 16a and 16b are directly guided from the selvage yarn guide 27 to the eyelets 4 in the selvage-yarn guide rods 38a and 38b, respectively, the paths of the first selvage yarns 16a and 16b interfere with the selvage shedding device 3. To prevent this, in the present embodiment, the first selvage yarn guides 67a and 67b are provided to regulate the paths of the first selvage yarns 16a and 16b to positions below the rotary member 10. In the present embodiment, the first selvage yarn guides 67a and 67b are disposed on the side opposite the warp row side of the engagement pin 13 of the selvage shedding device 3 in the weaving-width direction and at substantially the same vertical position as that of the first position P1 of the engagement pin 13 in the top-bottom direction. To prevent the path of the first selvage yarn 16b from crossing the path of the first selvage yarn 16a, the first selvage yarn guide 67b is disposed on the side opposite the warp row side of the first selvage yarn guide 67a in the weaving-width direction and on the downstream side of the first selvage yarn guide 67a in the warp direction. In addition, the first selvage yarn guide 67b is located below the first selvage yarn guide 67a in the top-bottom direction. The first selvage yarn guides 44a and 44b are provided on the top surface of the base member 37 of the selvage-yarn-path switching device 2 to prevent the first selvage yarns 16a and 16b that are guided from the first selvage yarn guides 67a and 67b to the eyelets 4 in the selvage-yarn guide rods 38a and 38b, respectively, from interfering with the second selvage yarn 16c. More specifically, the first selvage yarn guides 67a and 67b guide the first selvage yarns 16a and 16b, respectively, at fixed positions in a region upstream of the selvage-yarn-path switching device 2 (selvage-yarn guide rods 38a and 38b). The eyelets 4 in the selvage-yarn guide rods 38a and 38b are swung by the base member 37 in a region downstream of the first selvage yarn guides 67a and 67b. When the base member 37 is at an upstream or downstream swing limit, one or the other of the first selvage yarns 16a and 16b passes through a position where it crosses the path of the second selvage yarn 16c in the weaving-width direction in a region between the first selvage yarn guide 67a and the selvage-yarn guide rod 38a or between the first selvage yarn guide 67b and the selvage-yarn guide rod 38b. Therefore, if the first selvage yarns 16a and 16b are directly guided from the first selvage yarn guides 67a and 67b to the eyelets 4 in the selvage-yarn guide rods 38a and 38b, respectively, the paths from the first selvage yarn guides 67a and 67b to the eyelets 4 in the selvage-yarn guide rods 38a and 38b, respectively, pass through positions where they cross the path of the second selvage yarn 16c at the lowermost position (path of the second selvage yarn 16c in the state in which the engagement pin 13 is at the first position P1) also in the top-bottom direction. In such a case, when the second selvage yarn 16c is moved downward in response to the movement of the engagement pin 13, the second selvage yarn 16c interferes with one of the first selvage yarns 16a and 16b and cannot be moved to an intended position. As a result, a selvage shed having the desired size cannot be formed. To prevent this, the first selvage yarn guides 44a and 44b are arranged near the selvage-yarn guide rods 38a and 38b, respectively, on the base member 37 in the present embodiment. The first selvage yarn guides 44a and 44b regulate the paths of the first selvage yarns 16a and 16b from the first selvage yarn guides 67a and 67b to positions near the bottom ends of the selvage-yarn guide rods 38a and 38b, respectively, to positions below the path of the second selvage yarn 16c at the lowermost position. As illustrated in As illustrated in With the above-described structure, the amount by which the swing block 45 swings may be adjusted so that the middle position of the line segment L is located on the path of the second selvage yarn 16c in top view when the base member 37 is at the upstream or downstream swing limit. Accordingly, as illustrated in The selvage yarn guide 27 according to the present embodiment illustrated in The operation of the selvage forming apparatus 1 will now be described with reference to In the weaving operation of the loom, the DD motor 58 (not shown) included in the selvage shedding device 3 is driven so that the rotary member 10 (engagement pin 13) rotates through one revolution clockwise when viewed from the warp row side in the weaving-width direction each time the loom main shaft rotates through one revolution. In the present embodiment, the phase relationship between the rotation angle of the loom main shaft and that of the engagement pin 13 that moves along the revolution path is set so that the engagement pin 13 is at a middle position of a movement path from the second position P2 to the first position P1 when the main shaft angle is 0°, at which beating-up motion for the weft yarn is performed. The phase relationship between the rotation angle of the loom main shaft and that of the engagement pin 13 that moves along the revolution path is not limited to this, and the phase of the rotary member 10 with respect to the main shaft of the loom may be changed as necessary. In the selvage-yarn-path switching device 2, the time at which the base member 37 is swung from one of the upstream and downstream swing limits to the other (time at which the polarity of the electromagnet is switched in the first drive device 8, that is, the time at which the paths of the first selvage yarns 16a and 16b are switched) is set to the time at which the engagement pin 13 reaches the second position in the selvage shedding device 3. (1) Referring to At this time, the second selvage yarn 16c extends through a space between the selvage-yarn guide rods 38a and 38b in the warp direction. (2) While the partial path of the second selvage yarn 16c is being moved upward after the selvage shed is formed in step (1), the weft insertion operation is started when the rotation angle of the loom main shaft reaches the weft insertion start angle. Accordingly, the weft yarn is inserted into the selvage shed. The leading end of the inserted weft yarn passes through the selvage shed at the weft insertion side immediately after the start of the weft insertion operation, travels through the warp shed, and reaches the selvage shed at the weft arrival side (not shown) after passing the position of the cloth edge at the weft arrival side. Therefore, the driving operation of the DD motor 58 included in the selvage forming apparatus 1 at the weft insertion side is controlled so that the size of the selvage shed is greater than or equal to the size large enough for the weft insertion operation (required size) at least over the entire weft insertion period. The driving operation of the DD motor 58 included in the selvage forming apparatus 1 at the weft arrival side (not shown) is controlled so that the size of the selvage shed is greater than or equal to the required size at least at the end of the weft insertion operation. (3) As illustrated in (4) Subsequently, when the engagement pin 13 reaches the second position P2, the partial path of the second selvage yarn 16c reaches the uppermost position at which the partial path is above the tip end of the selvage-yarn guide rod 38a. At this time, the first drive device 8 of the selvage-yarn-path switching device 2 swings the base member 37 around the axis of the support shaft 36 from one of the swing limits to the other. Accordingly, the paths of the first selvage yarns 16a and 16b at the side opposite the warp row side of and the warp row side of the path of the second selvage yarn 16c in the weaving-width direction when viewed from above are switched in the weaving-width direction (see (5) Next, when the rotary member 10 is further rotated and the engagement pin 13 is moved downward from the second position P2, the partial path of the second selvage yarn 16c is also moved downward from the uppermost position. When the main shaft angle of the loom reaches 0°, the partial path of the second selvage yarn 16c reaches the above-described middle position. At this time, the beating-up motion for the inserted weft yarn is performed. When the partial path of the second selvage yarn 16c is moved downward from the uppermost position, the partial path of the second selvage yarn 16c is moved in a direction for opening the selvage shed in which the weft yarn is held. However, as described above, the first selvage yarns 16a and 16b are caused to cross the second selvage yarn 16c in the weaving-width direction. Therefore, even when the partial path of the second selvage yarn 16c is moved downward to a position below the first selvage yarns 16a and 16b, the weft yarn is not released from the selvage shed and the state in which the weft yarn is held by the first selvage yarns 16a and 16b and the second selvage yarn 16c is maintained. The above-described steps (1) to (5) are repeated each time the main shaft of the loom rotates through one revolution, so that a three-yarn leno selvage construction illustrated in Although an embodiment of the present invention has been described, the present invention is not limited to the above-described embodiment, and various embodiments are possible within the technical scope of the present invention. Other embodiments will now be described. Although the selvage forming apparatus according to the above-described embodiment forms a three-yarn leno selvage construction by using the two first selvage yarns 16a and 16b and one second selvage yarn 16c, the number of selvage yarns are not limited to three. For example, the number of first selvage yarns 16a and 16b may be reduced to one, and a two-yarn leno selvage construction illustrated in In the above-described embodiment, the selvage-yarn-path switching device 2 forms the leno selvage construction illustrated in In the above-described embodiment, the selvage-yarn guide rods 38a and 38b are arranged so as to stand on the top surface of the base member 37 and extend upward in the vertical direction, and the first drive device 8 is disposed below the base member 37. However, for example, the selvage-yarn-path switching device 2 according to the above-described embodiment may be vertically inverted, as illustrated in In the structure illustrated in In the illustrated example, unlike the above-described embodiment, the selvage yarn guide 27 is disposed above the selvage shedding device 3, and the path of the second selvage yarn 16c in the state in which the engagement pin 13 is omitted is above or at substantially the same level as the engagement pin 13 at the uppermost position in the top-bottom direction. Therefore, opposite to the above-described embodiment, when the component of the revolution of the engagement pin 13 in the top-bottom direction is upward, the second selvage yarn 16c moves upward so as to follow the engagement pin 13 owing to the tension of the second selvage yarn 16c, and the path of the second selvage yarn 16c is moved upward to a position where the weft insertion operation can be performed (a shed is formed). When the component of the revolution of the engagement pin 13 in the top-bottom direction is downward, the second selvage yarn 16c is pushed downward from above by the engagement pin 13, and the path of the second selvage yarn 16c is moved downward to a position where the paths of the first selvage yarns 16a and 16b can be switched by the selvage-yarn-path switching device 2. The direction in which the selvage-yarn guide members 5 extend is not limited to the vertical direction as described above, and may be at an angle relative to the vertical direction and inclined toward the warp direction and/or the weaving-width direction as long as the paths of the first selvage yarns 16a and 16b can be switched without a problem. In this case, the entire body of the selvage-yarn-path switching device 2 may be inclined (the support member 6 may be inclined with respect to the top-bottom direction (vertical direction) toward the warp direction and/or the weaving-width direction). Alternatively, the support member 6 may be oriented in the vertical direction and the selvage-yarn guide members 5 may be inclined with respect to the displacement member 7. In the above-described embodiment, the positions of the selvage-yarn guide members 5 (eyelets 4) are switched in the weaving-width direction by swinging the base member 37, which functions as the displacement member 7 to which the selvage-yarn guide members 5 are fixed, around the rotation axis that extends in the vertical direction. However, the structures illustrated in In the example illustrated in A selvage-yarn-path switching device 2 of this example includes actuators 73 that function as first drive devices 8; a groove member 71 in which grooves 70 are formed so as to extend in the weaving-width direction and that functions as a support member 6; and slide bases 72 that support the respective selvage-yarn guide members 5, that are movable in the weaving-width direction along the grooves 70 in the groove member 71, and that function as the displacement members 7. First selvage yarn guides 74 are fixed to the groove member 71. The actuators 73 linearly move the slide bases 72 in the weaving-width direction along the grooves 70 in the groove member 71 so that the positions of eyelets 4 in the selvage-yarn guide members 5 are switched in the weaving-width direction. In the example illustrated in A selvage-yarn-path switching device 2 of this example illustrated in The servo motor 76 rotationally drives the disc-shaped base member 78 in one direction so that the selvage-yarn guide member 5 revolves around the rotation axis of the support shaft 77 and the position of the eyelet 4 in the selvage-yarn guide member 5 is switched in the weaving-width direction. In this case, the servo motor 76 is preferably controlled so as to rotate intermittently. However, the servo motor 76 may instead be controlled so as to rotate continuously. In the case where the servo motor 76 is intermittently rotated, two specific positions may be set on both sides (the warp row side and the side opposite the warp row side) of a path of a second selvage yarn 16c in the weaving-width direction. The servo motor 76 may be controlled so that the output shaft of the servo motor 76 (the support shaft 77) is rotated through half a revolution to move the selvage-yarn guide member 5 between the two positions each time the main shaft is rotated through one revolution and so that the selvage-yarn guide member 5 is at one of the two positions in a predetermined period during each revolution of the loom main shaft. The selvage-yarn guide member 5 may be moved between the two positions while the second selvage yarn 16c is positioned above the top end of the selvage-yarn guide member 5 in the top-bottom direction. In the case where the servo motor 76 is continuously rotated, the output shaft of the servo motor 76 (support shaft 77) is rotated through a single revolution so that the selvage-yarn guide member 5 is rotated through a single revolution around the axis of the support shaft 77 each time the main shaft of the loom rotates through two revolutions. The servo motor 76 is controlled so that the time at which the selvage-yarn guide member 5 crosses the path of the second selvage yarn 16c in the weaving-width direction is within the period in which the second selvage yarn 16c is above the top end of the selvage-yarn guide member 5 in the top-bottom direction. In this example, the selvage-yarn guide member 5 is supported by the disc-shaped base member 78 with the bearing 80 interposed therebetween. Therefore, the selvage-yarn guide member 5 revolves around the axis of the support shaft 77 while rotating so that the eyelet 4 is always oriented in the warp direction owing to the tension of a first selvage yarn 16a. Thus, the first selvage yarn 16a is prevented from being coiled (wound) around the selvage-yarn guide member 5 as a result of the revolution of the selvage-yarn guide member 5. A selvage-yarn-path switching device 2 of the present embodiment includes a support shaft 82 that is fixedly arranged on a main-body bracket 83 so as to extend in the warp direction and that functions as a support member 6. Swing rods 85, which function as the selvage-yarn guide members 5, are supported by respective end portions of the support shaft 82 in a swingable manner. The swing rods 85 have through holes 84 at intermediate positions in the direction in which the swing rods 85 extend, and the support shaft 82 are fitted to the through holes 84 so that the swing rods 85 are supported in a swingable manner. The swing rods 85 have elongate holes 86 at the bottom ends (ends opposite to the ends at which the eyelets 4 are formed) thereof. The elongate holes 86 are long in the direction in which the swing rods 85 extend and extend through the swing rods 85 in the thickness direction. First selvage yarn guides 92 are fixed to the main-body bracket 83. In the illustrated example, a first drive device 8 includes a rotating shaft 87 that is fixedly arranged so as to extend in the warp direction; two crank discs 88 that are integrated with respective end portions of the rotating shaft 87 such that rotation centers thereof are on the axis of the rotating shaft 87 and such that the crank discs 88 are not rotatable relative to each other; swing pins 89 attached to the respective crank discs 88 at positions shifted from the rotation centers of the crank discs 88; a pinion gear 91 that meshes with gear teeth formed on the outer periphery of one of the two crank discs 88 (the upstream crank disc 88 in the illustrated example); and a servo motor 90 that is attached to an output shaft of the pinion gear 91. The swing pins 89 are inserted through the elongate holes 86 in the respective swing rods 85, so that the first drive device 8 is connected to the swing rods 85. Thus, the swing rods 85 (in particular, portions of the swing rods 85 below the through holes 84), the crank discs 88, and the swing pins 89 form a crank mechanism. When the servo motor 90 rotationally drives the crank discs 88, the swing pins 89 move in the weaving-width direction so that the swing rods 85 swing in a reciprocating manner around the support shaft 82. As a result, portions of the swing rods 85 above the support shaft 82 move symmetrically to the respective swing pins 89 about the support shaft 82, and the positions of the eyelets 4 are moved in the weaving-width direction. Since the swing pins 89 are inserted through the elongate holes 86 formed in the swing rods 85, the swing rods 85 are not influenced by the movement of the swing pins 89 in the top-bottom direction due to the rotation of the crank discs 88. In the example illustrated in In a selvage-yarn-path switching device 2 of this example, a first drive device 8 includes two servo motors 94 for respective swing rods 93 that serve as the selvage-yarn guide members 5. The servo motors 94 are fixedly arranged on a main block 95 such that rotation axes of output shafts 94a thereof extend in the warp direction. Drive discs 96 are attached to the output shafts 94a of the respective servo motors 94, and the swing rods 93 are arranged so as to stand on the respective drive discs 96. First selvage yarn guides 97 are fixed to the main block 95. When the servo motors 94 periodically (intermittently) rotate the respective drive discs 96 in a reciprocating manner, the swing rods 93 are driven so as to swing in a reciprocating manner, so that the positions of eyelets 4 formed in the swing rods 93 are switched between two positions that are on the warp row side of and the side opposite the warp row side of a second selvage yarn 16c in the weaving-width direction. In this case, the output shafts 94a of the servo motors 94 correspond to support members 6, and the drive discs 96 correspond to displacement members 7. In the above-described embodiment, the selvage shedding device 3 is configured such that the main body 12 of the rotary member 10 included in the selvage shedding device 3 includes the rotating disc 61, which is a disc-shaped thin plate member, and the support stay 63 attached to the rotating disc 61. However, the structure of the rotary member 10 is not limited to this, and the structures illustrated in In this example, the drive pulley 101 and the driven pulley 102 are attached to a support frame 32 such that a part of the path of the belt member 103 wound around the drive pulley 101 and the driven pulley 102 is perpendicular to the top-bottom direction and parallel to the warp direction. In this example, similar to the above-described embodiment, an engagement portion 9 is formed of an engagement pin 13. The engagement pin 13 is fixed to the outer peripheral surface of the belt member 103 such that an axis thereof is parallel to an axis of the drive shaft 100, and is arranged so as to partially project from the belt member 103 in the weaving-width direction. The drive pulley 101 is rotationally driven so that the belt member 103 is continuously rotated in one direction. Accordingly, the engagement pin 13 is moved along a revolution path that extends along the outer peripheral surface of the belt member 103. In the above-described embodiment, the selvage shedding device is configured such that the engagement portion 9, which engages with the second selvage yarn 16c, is formed of the engagement pin 13 that engages with the second selvage yarn 16c at the outer peripheral surface thereof. However, the structure of the engagement portion 9 is not limited to this. For example, as illustrated in In the illustrated example, the selvage shedding device 3 includes a second drive device 11 that is composed of an inner-rotor DD motor (not shown), as in the above-described embodiment. The DD motor is attached to a support frame 108 in such a manner that the rotation axis of the DD motor extends in the weaving-width direction. A rotating disc 106, which serves as the main body 12 of the rotary member 10, is attached to a warp-row-side surface of a rotor of the DD motor such that the rotating disc 106 is not rotatable relative to the rotor. A first stay 107 is fixed to a warp-row-side surface of the rotating disc 106. The first stay 107 includes an end portion having a side surface that is parallel to the warp direction. A through hole is formed in the end portion of the first stay 107 so as to extend through the end portion in the weaving-width direction, and a first eyelet member 110 in which the eyelet 105 is formed is attached to the through hole. The first eyelet member 110 is a cylindrical member through which the eyelet 105 extends in the axial direction, and has a flange portion for guiding the second selvage yarn 16c at an end thereof in the axial direction. The first eyelet member 110 is fitted to the through hole in the first stay 107 such that the flange portion thereof projects from a warp-row-side surface of the first stay 107. The second selvage yarn 16c is inserted through the eyelet 105 from the rotating-disc-106 side, is engaged with and bent at the inner peripheral edge of the flange portion of the first eyelet member 110, and is guided toward the cloth fell 24. Therefore, in this example, the eyelet 105 in the first eyelet member 110 corresponds to the engagement portion 9 of the rotary member 10. The dimension of the first stay 107, that is, the dimension from an attachment portion of the first stay 107 that is attached to the rotating disc 106 to the tip end, is set so that the revolution path of the eyelet 105 around the rotation axis satisfies conditions 1 and 2 as in the above-described embodiment. In the case where the second selvage yarn 16c is inserted through the eyelet 105 as in the illustrated example, it is necessary that the path of the second selvage yarn 16c do not interfere with the rotary member 10 in a region upstream of (on the bobbin side of) the eyelet 105. More specifically, it is necessary that there is no component that crosses the path of the second selvage yarn 16c in the weaving-width direction (the first stay 107 in this example) in a region upstream of the eyelet 105. Accordingly, in the present embodiment, a tubular path 111 is provided so as to extend through the selvage shedding device 3 in the weaving-width direction, and the second selvage yarn 16c is inserted through the tubular path 111 from the side opposite the warp row side. The second selvage yarn 16c is constantly guided from a position of the rotation axis at the warp row side of the tubular path 111 to the eyelet 105. Accordingly, irrespective of the position of the eyelet 105 on the revolution path, no component crosses the path of the second selvage yarn 16c in the region upstream of the eyelet 105 in the selvage shedding device 3. More specifically, the tubular path 111 includes a cylindrical member (not shown) through which a through hole extends in the axial direction and two second eyelet members 112 that are fitted to the through hole in the cylindrical member at both ends of the through hole. The cylindrical member (not shown) is long enough to extend through the rotating disc 106, the DD motor (not shown), and the support frame 108 in the weaving-width direction, and is fixed to the rotating disc 106 so as to extend through the rotating disc 106, the DD motor (not shown), and the support frame 108 such that the axis thereof coincides with the rotation axis of the rotary member 10. With this structure, the second selvage yarn 16c is inserted into the eyelet member 112 at the end of the tubular path 111 on the side opposite the warp row side (back side of the support frame 108), as illustrated in In this example, as illustrated in The second stay 113 is attached to a side surface of the rotating disc 106 on the side opposite the warp row side, and a through hole is formed in an end portion of the second stay 113 so as to extend though the end portion in the weaving-width direction. A third eyelet member 114 having an eyelet is fitted to the through hole. The second stay 113 is attached to the rotating disc 106 so that the eyelet in the eyelet member 114 is at the same position as the eyelet in the first eyelet member 110 in the weaving-width direction. In the illustrated example, the path of the second selvage yarn 16c extends through the eyelet in the third eyelet member 114 in a region upstream of the second eyelet members 112 (tubular path 111). With this structure, the variation in the length of the partial path of the second selvage yarn 16c from the cloth fell 24 to the first eyelet member 110 due to the rotation of the rotary member 10 (first stay 107) is absorbed and reduced by the variation in the length of the path of the second selvage yarn 16c in the region upstream of the second eyelet members 112. As in the illustrated example, in the case where the second selvage yarn 16c is positively moved in the top-bottom direction by the eyelet 105, which serves as the engagement portion 9, the selvage yarn guide 27 according to the above-described embodiment that determines the path of the second selvage yarn 16c in the state in which the shed is opened is not necessary. More specifically, in the above-described embodiment, the second selvage yarn 16c is passively moved downward by using the tension of the second selvage yarn 16c itself. Therefore, the selvage yarn guide 27 is required to regulate the position of the path of the second selvage yarn 16c in the top-bottom direction in the state in which the shed is opened to a position where the size of the selvage shed is at a maximum. In contrast, in the illustrated example, the second selvage yarn 16c is inserted through the eyelet 105 and is positively moved in the top-bottom direction. Therefore, the selvage yarn guide 27 according to the above-described embodiment is not necessary. Only a selvage yarn guide having a function of simply guiding the second selvage yarn 16c from the corresponding bobbin to the eyelet 105 is required, and the freedom of arrangement of the selvage yarn guide is increased compared to that in the above-described embodiment. Instead of the engagement pin 13 that serves as the engagement portion 9 of the selvage shedding device 3 in the above-described embodiment, an eyelet pin 123 having an eyelet 122 may be provided as the engagement portion 9. The structure illustrated in In this example, the eyelet pin 123 is supported by a support stay 124 of a rotary member 10 such that the axis thereof extends in the weaving-width direction. The eyelet pin 123 has an eyelet 122 that extends through the eyelet pin 123 in a direction orthogonal to the axis of the eyelet pin 123 (weaving-width direction) at a position on the warp row side of the position at which the eyelet pin 123 is supported by the support stay 124. The eyelet pin 123 is supported by the support stay 124 with a bearing 125 interposed therebetween, and is rotatable around the axis thereof. The reason why the eyelet pin 123 is attached to the support stay 124 with the bearing 125 interposed therebetween will now be described. If the bearing 125 is omitted, the eyelet pin 123 itself serves as a component that crosses the path of the second selvage yarn 16c in the region upstream of the eyelet 122 depending on the orientation of the eyelet 122. Therefore, the second selvage yarn 16c becomes wound around the eyelet pin 123 when the rotary member 10 is rotated. In contrast, in the case where the eyelet pin 123 is supported by the support stay 124 with the bearing 125 interposed therebetween, when the rotary member 10 is rotated, the eyelet pin 123 moves along the revolution path while rotating so that the eyelet 122 is always oriented toward the cloth fell owing to the tension of the second selvage yarn 16c. Owing to the rotation of the eyelet pin 123, there is no component that crosses the path of the second selvage yarn 16c in the region upstream of the eyelet 122. In other words, irrespective of the position of the eyelet pin 123 on the revolution path, the eyelet pin 123 does not contact the second selvage yarn 16c in regions other than the eyelet 122. As a result, the second selvage yarn 16c is prevented from being wound around the eyelet pin 123. In the above-described embodiment, the engagement pin 13 having a circular cross section is used as the engagement portion 9. However, in the case where the engagement portion 9 is formed of an engagement pin, the cross-sectional shape of the engagement pin is not limited to a circular shape, and may instead be flat as illustrated in In the case where an engagement pin 126 having a flat cross section illustrated in In the above-described embodiment, the engagement portion 9 is provided on the support stay 63 that is fixed to the main body 12. However, the support stay 63 may be omitted in the above-described embodiment, and the engagement pin 13 may be attached to the rotating disc 61 that serves as the main body 12. Alternatively, as illustrated in In the example illustrated in The eyelet members 116 are similar to the eyelet member 110 in the example illustrated in The second selvage yarn 16c is inserted into the eyelet member 116 at the side opposite the warp row side (back side of the support frame 121) (not shown) and is pulled out from the eyelet member 116 at the warp row side (front side of the support frame 121), so that the second selvage yarn 16c extends through the rotary ring 115 and is guided toward the cloth fell 24. No component that extends in the weaving-width direction is attached to the side surface of the rotary ring 115 on the warp row side or the side surface of the rotary ring 115 on the side opposite the warp row side. Therefore, there is no component that crosses the path of the second selvage yarn 16c in the weaving-width direction in the region upstream of the eyelet members 116, and the rotary member 10 does not interfere with the second selvage yarn 16c when the rotary member 10 is rotated. In the example illustrated in More specifically, in the example illustrated in In the examples illustrated in In the above-described embodiment, the engagement portion 9 is moved along the revolution path by rotating the rotary member 10 around the rotation axis that extends parallel to the weaving-width direction. However, the rotary member 10 may instead be rotated around a rotation axis that is inclined from the weaving-width direction toward the top-bottom direction and the warp direction within a range in which the movement of the path of the second selvage yarn 16c in the top-bottom direction is not adversely affected. In the above-described embodiment, the second drive device 11 used to rotate the rotary member 10 is the DD motor 58 of an inner rotor type. However, the second drive device 11 is not limited to this, and may instead be a DD motor of an outer rotor type. Alternatively, a servo motor may be used in place of the DD motor, and the rotary member 10 may be directly attached to a rotating shaft of the servo motor. Alternatively, as illustrated in In the selvage forming apparatus 1 at the weft insertion side according to the above-described embodiment, the rotary member 10 is rotated clockwise when the selvage forming apparatus 1 is viewed from the warp row side in the weaving-width direction. However, the rotary member 10 may instead be rotated counterclockwise. When the rotary member 10 is rotated counterclockwise in the structure including the regulating member 15 according to the above-described embodiment, there is an advantage that the period in which the shed that allows the weft insertion operation is formed is longer than that in the case where the rotary member 10 is rotated clockwise. This will be described in more detail. In the following description, it is assumed that the revolution path along which the engagement pin is moved is divided into an upstream section and a downstream section by a vertical line that passes through the rotation center of the rotary member 10. The upstream section of the revolution path is referred so as an upstream revolution path section, and the downstream section of the revolution path is referred to as a downstream revolution path section. In the case where the regulating member 15 is disposed downstream of the selvage shedding device 3 as in the above-described embodiment, the second selvage yarn 16c is bent toward the warp row side in the weaving-width direction at the position of the regulating member 15, and is then guided to the cloth fell 24. In this case, when the second selvage yarn 16c is moved in the top-bottom direction, the second selvage yarn 16c slides along the regulating member 15 and receives a frictional resistance. When the rotary member 10 is rotated counterclockwise to rotate the engagement portion 9 from the second position P2 to the first position P1, the engagement portion 9 is moved along the downstream revolution path section. When the rotary member 10 is rotated clockwise, the engagement portion 9 is moved along the upstream revolution path section. Thus, the distance between the engagement portion 9 and the regulating member 15, that is, the length of the path of the second selvage yarn 16c between the engagement portion 9 and the regulating member 15, differs between the case in which the rotary member 10 is rotated counterclockwise and the case in which the rotary member 10 is rotated clockwise. In the former case, the second selvage yarn 16c is moved downward while the length of the above-described path is smaller than that in the state in which the engagement portion 9 is at the second position P2. In the latter case, the second selvage yarn 16c is moved downward while the length of the above-described path is larger than that in the state in which the engagement portion 9 is at the second position P2. When the rotary member 10 is rotated counterclockwise, the length of the above-described path is smaller than that in the case where the rotary member 10 is rotated clockwise, and therefore the partial path of the second selvage yarn 16c is not easily bent. Even though the second selvage yarn 16c slides along the regulating member 15 and receives a frictional resistance, the second selvage yarn 16c reliably follows the movement of the engagement portion 9 and moves downward. As a result, the selvage shed is quickly formed in response to the movement of the engagement portion 9 when the rotary member 10 is rotated counterclockwise. When the rotary member 10 is rotated counterclockwise to rotate the engagement portion 9 from the first position P1 to the second position P2, the engagement portion 9 is moved along the upstream revolution path section. When the rotary member 10 is rotated clockwise, the engagement portion 9 is moved along the downstream revolution path section. Thus, the length of the path of the second selvage yarn 16c between the engagement portion 9 and the regulating member 15 differs between the case in which the rotary member 10 is rotated counterclockwise and the case in which the rotary member 10 is rotated clockwise. In the former case, the second selvage yarn 16c is moved upward while the length of the above-described path is larger than that in the state in which the engagement portion 9 is at the first position P1. In the latter case, the second selvage yarn 16c is moved upward while the length of the above-described path is smaller than that in the state in which the engagement portion 9 is at the first position P1. When the rotary member 10 is rotated counterclockwise, the length of the above-described path is larger than that in the case where the rotary member 10 is rotated clockwise, and therefore the partial path of the second selvage yarn 16c is easily bent. When the second selvage yarn 16c slides along the regulating member 15 and receives a frictional resistance, followability of the second selvage yarn 16c to the movement of the engagement portion 9 is reduced. Accordingly, the upward movement of the second selvage yarn 16c is slower than the movement of the engagement portion 9. As a result, the selvage shed is slowly closed in response to the movement of the engagement portion 9 when the rotary member 10 is rotated counterclockwise. As described above, in the case where the selvage forming apparatus 1 includes the regulating member 15 and the rotary member 10 is rotated counterclockwise, the selvage shed is quickly formed and slowly closed in response to the movement of the engagement portion 9. Therefore, there is an advantage that the selvage-shed opening period in which the weft insertion operation can be performed can be made longer than that in the case where the rotary member 10 is rotated clockwise. However, in the case where the rotary member 10 is rotated clockwise as in the above-described embodiment, there is an advantage that the time at which the paths of the first selvage yarns 16a and 16b are switched can be made earlier than that in the case where the rotary member 10 is rotated counterclockwise. This will be described in more detail. When the rotary member 10 is rotated clockwise, the engagement pin 13 that is rotated from the first position P1 to the second position P2 is moved upward along the downstream revolution path section that is on the downstream side from the rotation axis of the rotary member 10. The length of the path of the second selvage yarn 16c between the engagement portion 9 and the regulating member 15 is small, and the partial path of the second selvage yarn 16c is not easily bent. Accordingly, the second selvage yarn 16c reliably follows the movement of the engagement pin 13. If the selvage-yarn-path switching device 2 starts switching the paths of the first selvage yarns 16a and 16b while the vertical position of the partial path of the second selvage yarn 16c at the positions of the selvage-yarn guide members 5 in the warp direction is below the top ends of the selvage-yarn guide members 5, the selvage-yarn guide members 5 may interfere with the second selvage yarn 16c. Even in such a case, since the partial path of the second selvage yarn 16c is not easily bent, the second selvage yarn 16c is not easily caught as a result of receiving a frictional resistance or being bent when the selvage-yarn guide members 5 interfere with the second selvage yarn 16c, and can be forcedly moved upward and released from between the selvage-yarn guide members 5. Therefore, the time at which the paths of the first selvage yarns 16a and 16b are switched can be made earlier, and the selvage forming apparatus can be used in a loom operated at a higher speed. Similar to the selvage forming apparatus at the weft insertion side, also in the selvage forming apparatus at the weft arrival side (not shown), the rotary member may be rotated either clockwise or counterclockwise. In the selvage forming apparatus at the weft arrival side, the relationship between the rotation direction of the rotary member 10 and the shed forming and closing operations is similar to that in the selvage forming apparatus 1 at the weft insertion side described above, except "counterclockwise" is to be read as "clockwise" and "clockwise" is to be read as "counterclockwise" in the above description. In the above-described embodiment, a part of the selvage shedding device 3 (rotary member 10) is disposed in a region in which the heald frames 28a are present. However, it is not necessary to dispose the selvage shedding device 3 (rotary member 10) in the region in which the heald frames 28a are present. For example, if the size of the selvage shed is larger than that required for the weft insertion operation, the rotary member 10 may be disposed upstream of the heald frames 28a in the warp direction within a range in which the weft insertion operation can be performed without a problem. In the case where the rotation speed of the main shaft of the loom in the weaving operation is relatively low, the rotation speed of the DD motor 58 and the rotary member 10 of the selvage shedding device 3 may also be relatively low. Therefore, the load applied to the second drive device 11 owing to the inertia of the DD motor 58 and the rotary member 10 is also small. In such a case, the diameter of the revolution path of the engagement portion 9 may be increased by increasing the diameter of the rotary member 10 within a range in which the load applied to the second drive device 11 owing to the inertia is allowable, and the amount of movement of the second selvage yarn 16c in the top-bottom direction may be increased accordingly. Then, the rotary member 10 may be disposed upstream of the heald frames 28a in the warp direction while the size of the shed formed by the selvage yarns 16 is maintained at the size required for the weft insertion operation. In the above-described embodiment, the regulating member 15 is provided between the selvage shedding device 3 and the selvage-yarn-path switching device 2 in the warp direction. The regulating member 15 is provided to prevent the path of the second selvage yarn 16c from vibrating in the weaving-width direction in a region closer to the cloth fell 24 than the selvage shedding device 3 when the rotary member 10 is rotated. However, the regulating member 15 may be omitted. In such a case, the selvage shedding device 3 is preferably configured such that a plane including the revolution path of the engagement portion 9 is parallel to the path of the second selvage yarn 16c from the selvage yarn guide 27 to the cloth fell 24, that is, such that the path of the second selvage yarn 16c is orthogonal to the rotation axis of the rotary member 10. However, the regulating member 15 may be simply omitted when the arrangement of the selvage shedding device 3, the size of the revolution path of the rotary member 10, etc., are such that the above-described vibration is allowable or when the selvage-yarn-path switching device 2 is configured to tolerate the above-described vibration. In the above-described embodiment, the selvage yarn guide 27 is disposed below the selvage shedding device 3 so that, in the state in which the engagement pin 13 is omitted, the position of the path of the second selvage yarn 16c in the top-bottom direction at the position of the selvage shedding device 3 is below or at substantially the same level as the engagement pin 13 at the first position P1, which is the lowermost position on the revolution path. However, as illustrated in According to the above-described embodiment, the selvage forming apparatus 1 is provided at each of the weft insertion side and the weft arrival side of the loom that weaves a single strip of cloth, that is, at each side of the woven cloth. However, the present invention may also be applied to a center selvage forming apparatus of a double-width loom that simultaneously weaves a plurality of strips of cloth. In this case, in addition to the selvage forming apparatuses provided at the weft insertion side and the weft arrival side of the loom, two selvage forming apparatuses 1 for forming center selvages are provided between the adjacent strips of woven cloth (for example, between first and second strips formed in a two-strip weaving operation) so as to correspond to the cloth edges of the respective strips. In this case, similar to the above-described embodiment, each of the two selvage forming apparatuses 1 disposed between the adjacent strips of woven cloth may include a dedicated selvage-yarn-path switching device 2. Alternatively, however, a single selvage-yarn-path switching device 2 may be provided for the two selvage forming apparatuses 1. For example, Switching of the paths of the first selvage yarns 16a and 16b for the first woven cloth 127 and switching of the paths of the first selvage yarns 16a and 16b for the second woven cloth 128 are both performed by the selvage-yarn-path switching device 2. The selvage-yarn-path switching device 2 in this example includes a base member 129 that serves as a displacement member 7. Selvage-yarn guide rods 130a and 130b for the first woven cloth 127 and selvage-yarn guide rods 131a and 131b for the second woven cloth 128 are provided on the base member 129 as selvage-yarn guide members 5. The base member 129 is fixed to a support shaft 132 that serves as a support member 6. Similar to the above-described embodiment, a first drive device 8 (not shown) causes the base member 129 to swing with the support shaft 132 interposed therebetween, thereby switching the paths of the first selvage yarns 16a and 16b. In the illustrated example, first selvage yarn guides 133a, 133b, 134a, and 134b correspond to the first selvage yarn guides 44a and 44b according to the above-described embodiment, and regulating members 135 and 136 correspond to the regulating member 15 according to the above-described embodiment. The selvage forming apparatus according to the present invention may be used as a catch-cord selvage forming apparatus. In this case, the selvage yarns of the selvage forming apparatus according to the present invention that is disposed near a cloth edge and serves as a catch-cord selvage forming apparatus catch an end of the inserted weft yarn to form a selvage construction. The selvage construction is cut by a cutter after beating-up motion, and is released from the woven cloth as a catch-cord selvage. The catch-cord selvage that has been cut off, the catch-cord selvage being formed of the end of the weft yarn and the selvage yarns, is discarded. |