The coil spring manufacturing device (1A) includes a first continuous material mounting portion (4), a second continuous material mounting portion (5), a straightener (7), a cutter (8) which cuts a material (2), a short material mounting portion (9) on which a short material (2') obtained by the cutting is mounted, and a coiling machine (10). The material (2) reeled out from a first continuous material (2A) or a second continuous material (2B) is cut by the cutter (8). The coil spring manufacturing device (1A) can switch a process among a first continuous material coiling process of manufacturing a coil spring by using the material (2) reeled out from the first continuous material (2A), a second continuous material coiling process of manufacturing a coil spring by using the material (2) reeled out from the second continuous material (2B), and a short material coiling process of manufacturing a coil spring by using the short material (2').

A coil spring manufacturing device (10) includes a mandrel (11) around which a wire (W) is wound, a feed mechanism (12) which feeds the wire (W) toward the mandrel (11), guide members (15, 16) which guide the wire (W), a chuck (13) which fixes a distal end (W1) of the wire (W), and a clamp mechanism (71). The clamp mechanism (71) sandwiches the wire (W) from both sides before the distal end (W1) of the wire (W) reaches the mandrel (11). Further, the clamp mechanism (71) can be rotated about a fulcrum (80) by rotation means, and can also be slid in a direction along an axis (X1) of the mandrel (11) by slide means. In a state in which the wire (W) is sandwiched by the clamp mechanism (71), the clamp mechanism (71) is rotated, and if necessary, is slid. Thereby, a bent portion (W2) for a negative pitch portion of a coil spring is formed at a part of the wire (W).

The present invention includes a spiral forming step causing a substantially liner elongated member, which is conveyed toward one side in a longitudinal direction of the elongated member by a pair of conveying rollers, to be engaged at one side in a second direction with a pressing member movable in the second direction so that a spiral body including the fixed coil part, the first movable coil part and the second movable coil part is formed from the linear elongated member. The spiral forming step is configured to control the position of the pressing member with respect to the second direction, while recognizing, based on a signal from a rotational speed sensor for detecting the rotational speed of the conveying roller, a relationship between a position in the longitudinal direction of the elongated member that is engaged with the pressing member and the position in the circumferential direction after the spiral body is formed.

A pigtailing machine for providing a double pigtail (a;b) to a coil spring (14) includes a second forming head (18) and a support pedestal (22) secured to a cassette base (26). The cassette base (26) is located upon a base (20) which mounts the first forming head (16) to provide for a relatively quick changeover should another double pigtail coil spring need be manufactured. By fixing the second forming head (18) and the support pedestal (22) to the cassette base (26) alignment and proper manufacture of the spring is assured. Alternatively, the first forming head (16) is also mounted to the cassette base (26).

A device for bending the ends (17) which result from cutting to size a metallic binding spiral (9) includes a contrasting member (4) provided at the front with two pairs (12, 12') of flat lugs, mutually parallel and orthogonal to the axis of the spiral (9), suitable to securely retain the roots (16) of the two prongs (14) of the spiral (9) between which the cut has been performed, and a pushing member (7) provided at the front with a central tooth (13) radiused to the body of the pusher (7) and also orthogonal to the axis of the spiral (9), suitable to bend the ends (17) parallelly to the prongs (14) by interacting with said contrast (4). The contrast (4) and the pusher (7) move along substantially orthogonal axes under the action of double-acting pneumatic jacks.

An apparatus (11) for raising hooks of semi-finished springs (1), includes a rocking arm (17) arranged to be pivotally movable between an upper and a lower position and having a pair of lateral semi-finished spring holding pieces (21) at its forward end portion for transferring the semi-finished springs (1) manufactured by a spring manufacturing machine (9) towards a hook raising section (10) provided above a spring discharge opening (13) formed in a table (12) of the apparatus (11), a clamping unit (75) for fixedly clamping the semi-finished spring holding pieces (21) which have been transferred to the hook raising section (10) a rotational position control member (48) which rotates the semi-finished spring held between the semi-finished spring holding pieces (21) for its positional control and a pair of slide members (60) on which hook raising tools (67, 70) are mounted and which are adapted to advance freely towards or withdraw from the hook raising section (10) The apparatus is capable of automatically discharging the finished springs (1) through the discharge opening (13) by opening the pair of lateral holding pieces (21) after accurately effecting the hook raising of the semi-finished spring (1) above the spring discharge opening (13) of the table (12) through the positional control of the semi-finished springs.

An apparatus (11) for raising hooks of semi-finished springs (1), includes a rocking arm (17) arranged to be pivotally movable between an upper and a lower position and having a pair of lateral semi-finished spring holding pieces (21) at its forward end portion for transferring the semi-finished springs (1) manufactured by a spring manufacturing machine (9) towards a hook raising section (10) provided above a spring discharge opening (13) formed in a table (12) of the apparatus (11), a clamping unit (75) for fixedly clamping the semi-finished spring holding pieces (21) which have been transferred to the hook raising section (10) a rotational position control member (48) which rotates the semi-finished spring held between the semi-finished spring holding pieces (21) for its positional control and a pair of slide members (60) on which hook raising tools (67, 70) are mounted and which are adapted to advance freely towards or withdraw from the hook raising section (10) The apparatus is capable of automatically discharging the finished springs (1) through the discharge opening (13) by opening the pair of lateral holding pieces (21) after accurately effecting the hook raising of the semi-finished spring (1) above the spring discharge opening (13) of the table (12) through the positional control of the semi-finished springs.

Procédé de calandrage d'un ressort de barillet (100), depuis un lacet (1) comportant un coquillon (2) façonné au préalable, utilisant une calandre (20) comportant un premier moyen d'appui (10) exerçant un effort (F) sur ledit lacet (1) en une première zone de contact (A) située entre une deuxième (B) et une troisième (C) zones de contact que comportent un deuxième (12) et un troisième (13) moyens d'appui, pour enrouler, au-delà dudit coquillon (2), une zone d'accumulation (5) avec une courbure opposée à celle dudit coquillon (2), et où, lors de l'avance dudit lacet (1) on modifie progressivement la position de ladite première zone de contact (A) en l'éloignant desdites deuxième (B) et troisième (C) zones de contact, pour faire varier le rayon de calandrage depuis une première valeur minimale (R1) jusqu'à une deuxième valeur (R2) maximale au niveau d'un cou (3) de jonction entre ladite zone d'accumulation (5) et ledit coquillon (2).

Bei einer Federherstellungsmaschine mit einem Maschinengestell, auf dem ein Drahteinzug und eine Drahtführung (5) zur Zuführung eines Drahtes (10) in einer Zuführrichtung (s), ferner ein der Drahtführung (5) nachgeschalteter, senkrecht zum zugeführten Draht (10) sowohl in Höhenrichtung, als auch in Richtung senkrecht zum Maschinengestell verfahrbarer Dorn (16) und nach diesem ein parallel zur Drahtzuführrichtung (s) sowie in zwei zueinander und jeweils zur Drahtzuführrichtung (s) senkrechten Richtungen verfahrbares Umformwerkzeug (15) angebracht sind, weist der Dorn (16) einen Drahtzuführungskanal (27) auf, der im Dorn (16) in einem Abstand von dessen vom Maschinengestell abgewandter äußeren Seitenwand (31) ausgebildet ist, durch den der zugeführte Draht (10) durch den Dorn (16) zum Umformwerkzeug (15) führbar ist, wobei der Draht (10) ferner über eine Öffnung (46) im Dorn (16) in den Drahtführungskanal (27) einführbar ist.