TWO DOOR INTERLOCK MECHANISM FOR AN IMAGING DEVICE |
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申请号 | US15351537 | 申请日 | 2016-11-15 | 公开(公告)号 | US20170308028A1 | 公开(公告)日 | 2017-10-26 |
申请人 | LEXMARK INTERNATIONAL, INC.; | 发明人 | JOSEPH EDWIN DOMHOFF; PAUL DOUGLAS HORRALL; ALAN T PULLINS; | ||||
摘要 | An imaging device with a two door interlock system for detecting a positional state of orthogonally mounted first and second access doors of the imaging device. The two door interlock system includes a mounting assembly rotatably mounted to a frame of the imaging device and movable by the first access door between a first position and a second position, and an actuator projecting from an inner surface of the second access door, and a sensor positioned on the mounting assembly and providing an output signal that changes between a first state and a second state. The output signal being in the first state when both of the first and second access doors are in their respective closed positions and in the second state when at least one of the first and second access doors are in their respective open positions. | ||||||
权利要求 | What is claimed is: |
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说明书全文 | The present application is related to and claims priority under 35 U.S.C. 119(e) from U.S. provisional application No. 62/326,186, filed Apr. 22, 2016, entitled, “Two Door Interlock Mechanism For An Imaging Device” the content of which is hereby incorporated by reference herein in its entirety and which is assigned to the assignee of the present application. None. None. The field relates generally an imaging device, and, in particular, to door interlock systems. Imaging devices often have modular designs comprising varying consumer replaceable units (CRUs) such as waste toner cartridges, photoconductive members, and transport belt modules. Over the life of an imaging device, these CRUs may be replaced multiple times as the need arises. Replacing these CRUs typically requires access to the interior of the imaging device. In addition to replacing CRUs, there may be other times when it is necessary to access the interior of an imaging device. For instance, paper jam errors sometimes require access to interior portions of a paper feed path to clear misfeeds. As a result, imaging devices are often provided with access doors that may be opened or closed to access the interior of the device. Replacing CRUs or correcting paper jams often requires the user to be near high voltage components or laser components. Further, device errors and damage to moving components, hinges, or latch mechanisms may occur when the access doors are not closed and latched properly, thus causing device downtime and/or expensive repairs. It would be advantageous to use a mechanical system having only one interlock module to detect the positional states of each of two adjacent access doors at one centrally located position. Such design makes the system very robust against manufacturing tolerances and reduces cost. Disclosed is an imaging device having a two door interlock system. The imaging device comprises a frame having a first side and a second side positioned orthogonally with respect to the first side and a housing mounted on the frame. The housing includes a first and a second access door pivotally mounted on the first and second sides, respectively. The first and second access doors are movable between respective closed and open positions. The first access door substantially forms a first side of the housing when in the closed position and permits access to an interior of the housing when in the open position. The second access door substantially forms a second side of the housing when in the closed position and permits access to the interior of the housing when in the open position. A two door interlock system is positioned about immediately adjacent vertical edges of the first and second sides of the frame and is operative to detect a positional state of each of the first and second access doors. The two door interlock system includes a mounting assembly rotatably mounted to the frame of the imaging device and is movable between a first position and a second position when the first access door is in its closed and open positions, respectively. A bias spring is coupled to the mounting assembly for continuously biasing the mounting assembly towards its second position. A plunger assembly projects from an inner surface of the first access door and engages the mounting assembly when the first access door is moved from the open position to the closed position. With the first access door moved to the closed position, the plunger assembly moves the mounting assembly from its second position to its first position against the biasing force of the bias spring. An actuator projects from an inner surface of the second access door and is engageable with a sensor positioned on the mounting assembly when both the first and second access doors are in their respective closed positions. The sensor provides an output signal that changes between a first state and a second state wherein the first state indicates that the first and second access doors are in their respective closed positions and the second state indicates that at least one of the first and second access doors is in its open position. When the first and second access doors are in their respective closed positions, the actuator engages the sensor causing the output signal thereof to be in the first state. When the second access door is moved from the closed position to the open position while the first access door is in the closed position, the actuator is disengaged from the sensor causing the output signal thereof to change from the first state to the second state to indicate that one of the first and second access doors is in its open position. When the first access door is moved from the closed position to the open position while the second access door is in the closed position, the sensor disengages from the actuator as the mounting assembly is biased to rotate towards the second position causing the output signal of the sensor to change from the first state to the second state to indicate that at least one of the first and second access doors is in its open position. The above-mentioned and other features and advantages of this invention, and the manner of attaining them, will become more apparent and the invention will be better understood by reference to the following description of embodiments of the invention taken in conjunction with the accompanying drawings. It is to be understood that the present disclosure is not limited in its application to the details of construction and the arrangement of components set forth in the following description or illustrated in the drawings. The present disclosure is capable of other embodiments and of being practiced or of being carried out in various ways. Also, it is to be understood that the phraseology and terminology used herein is for the purpose of description and should not be regarded as limiting. As used herein, the terms “having”, “containing”, “including”, “comprising”, and the like are open ended terms that indicate the presence of stated elements or features, but do not preclude additional elements or features. The articles “a”, “an” and “the” are intended to include the plural as well as the singular, unless the context clearly indicates otherwise. The use of “including”, “comprising”, or “having” and variations thereof herein is meant to encompass the items listed thereafter and equivalents thereof as well as additional items. Terms such as “about” and the like have a contextual meaning, are used to describe various characteristics of an object, and have their ordinary and customary meaning to persons of ordinary skill in the pertinent art. Terms such as “about” and the like, in a first context mean “approximately” to an extent as understood by persons of ordinary skill in the pertinent art; and, in a second context, are used to describe various characteristics of an object, and in such second context mean “within a small percentage of” as understood by persons of ordinary skill in the pertinent art. Unless limited otherwise, the terms “connected”, “coupled”, and “mounted”, and variations thereof herein are used broadly and encompass direct and indirect connections, couplings, and mountings. In addition, the terms “connected” and “coupled” and variations thereof are not restricted to physical or mechanical connections or couplings. Spatially relative terms such as “left”, “right”, “top”, “bottom”, “front”, “back”, “rear”, “side”, “under”, “below”, “lower”, “over”, “upper”, and the like, are used for ease of description to explain the positioning of one element relative to a second element. These terms are intended to encompass different orientations of the device in addition to different orientations than those depicted in the figures. Relative positional terms may be used herein. For example, “superior” means that an element is above another element. Conversely “inferior” means that an element is below or beneath another element. Further, terms such as “first”, “second”, and the like, are also used to describe various elements, regions, sections, etc. and are also not intended to be limiting. Where possible, like terms refer to like elements throughout the description. Furthermore, and as described in subsequent paragraphs, the specific mechanical configurations illustrated in the drawings are intended to exemplify embodiments of the present disclosure and that other alternative mechanical configurations are possible. “Media” or “media sheet” refers to a material that receives a printed image or, with a document to be scanned, a material containing a printed image. The media is said to move along a media path, a media branch, and a media path extension from an upstream location to a downstream location as it moves from the media trays to the output area of the imaging system. For a top feed media tray, the top of the media tray is downstream from the bottom of the media tray. Conversely, for a bottom feed media tray, the top of the media tray is upstream from the bottom. As used herein, the leading edge of the media is that edge which first enters the media path and the trailing edge of the media is that edge that last enters the media path. Depending on the orientation of the media in a media tray, the leading/trailing edges may be the short edge of the media or the long edge of the media, in that most media is rectangular. As used herein, the term “media width” refers to the dimension of the media that is transverse to the direction of the media path. The term “media length” refers to the dimension of the media that is aligned to the direction of the media path. “Media process direction” describes the movement of media within the imaging device, and is generally means from an input toward an output of the imaging device. The terms “front” “rear” “left” and “right” as used herein for a removable media tray and its components are with reference to the removable media tray being inserted in the imaging device as viewed in As used herein, the term “communication link” is used to generally refer to structure that facilitates electronic communication between multiple components, and may operate using wired or wireless technology. Communications among components may be done via a standard communication protocol, such as for example, universal serial bus (USB), Ethernet, or IEEE 802.xx. Controller 70 is mounted within imaging device 10 and is used to control operation of imaging device 10, including a drive motor used to rotate one or more feed roll pairs to convey media through imaging device 10, motors for a pick mechanism for feeding media sheets from the removable media tray 80, and imaging operations, such as printing. A user interface 60, comprising a display 62 and a key panel 64, may be located on the front 22 of housing 20. User interface 60 is in operable communication with controller 70. Using the user interface 60, a user is able to enter commands and generally control the operation of the imaging device 10. For example, the user may enter commands to switch modes (e.g., color mode, monochrome mode), view the number of images printed, take the imaging device 10 on/off line to perform periodic maintenance, and the like. Controller 70 is also configured to work with the two door interlock system of the present disclosure. Controller 70 includes a processor unit and associated memory and may be formed as one or more Application Specific Integrated Circuits (ASICs). The associated memory may be, for example, random access memory (RAM), read only memory (ROM), and/or non-volatile RAM (NVRAM). Alternatively, the associated memory may be in the form of a separate electronic memory (e.g., RAM, ROM, and/or NVRAM), a hard drive, a CD or DVD drive, or any memory device convenient for use with the controller. Controller 70 may be illustrated in the figures as a single entity but it is understood that controller 70 may be implemented as any number of controllers, microcontrollers and/or processors. Side access door 50 includes a latching system 200 mounted on an interior surface 50-5 of side access door 50. Latching system 200 includes two pivotally mounted latch arms 210, 220 that engage with correspondingly aligned catches 215, 225, respectively, (see With reference to Mounting assembly 103 has top and bottom ends 103-1, 103-2 that are received into openings 152, 162 provided in top and bottom pivot mounts 150, 160, respectively. Top pivot mount 150 is fastened to frame 90 via opening 156 by a fastener 154. Top pivot mount 150 includes a slotted opening 152 for receiving top end 103-1 of mounting assembly 105. Slotted opening 152 allows the top of mounting assembly 103 some translation movement. Bottom pivot mount 160 is fastened to frame 90 via opening 166 by a fastener 164. Opening 162 is circular and receives the bottom end 103-2 of mounting assembly 103 allowing bottom end 103-2 to rotate therein. An upper bias spring 130 is mounted between the top end 103-1 of mounting assembly 103 and frame 90 of imaging device 10 for biasing the top end 103-1 towards frame 90. Upper bias spring 130 allows the top portion of the mounting assembly 103 to pivot into its closed position but also translate within slotted opening 152 when moving into this position. This allows the top 103-1 of the mounting assembly 103 that controls the location of switch actuator 107 on switch 105 to be referenced directly to the actuator 56. This advantageously eliminates all mechanical tolerances between the mounting assembly 103, switch 105 and the switch actuator 107. One skilled in the art would recognize that other forms of pivot mounts can be used to the same effect and that the illustrated pivot mounts are not considered to be a limitation of the design. A switch mount 110 for switch 105 is provided proximate to top end 103-1 of mounting assembly 103. Switch mount 110 includes a surface 111 having a pair of rods 112 and a pair of latching posts 113 projecting from surface 111. Switch 105 includes a pair of openings 106 that align with the pair of rods 112. Switch 105 is mounted via openings 112 on the pair of rods 112 and secured in place by the pair of latching posts 113. Switch 105 and its actuator 107 engage with actuator 56 through an opening 95 of frame 90 (see Referring to Referring to Referring to As shown in It will be realized that the output signal of only switch 105 may be used to indicate that both front and side access doors are closed. With side access door 50 closed and front access door 40 open, mounting assembly 103 rotates into its second position, moving switch 105 away from actuator 56 causing the output signal of switch 105 to change state indicating that at least one of the two doors 40, 50 are in an open position. With reference to As shown in With reference to In one example embodiment, access door latching system 200 uses an asymmetric latching design such that when a closing force is applied to side access door 50 near front latch arm 210 to move the side access door 50 towards its closed position, front and rear latch arms 210, 220 both latch onto their respective front and rear catches 215, 225. With the front access door 40 closed and side access door 50 open, as would be the case when a media jam is indicated on user interface 60, when the closing force is applied to side access door 50 near rear latch arm 220, rear latch arm 220 locks onto rear catch 225 without front latch arm 210 locking onto front catch 215 causing actuator 56 to not actuate switch 105 and change the state of signal S1 being sent to controller 70 indicating that side access door 50 remains in its open position. In As access door release handle 52 is actuated to move side access door 50 to its open position, first and second latch arms 210, 220 unlatches from their respective catches 215, 225, allowing side access door 50 to move from the closed position to the open position. In the event that side access door 50 is in the open position and front access door 40 is in the closed position, mounting assembly 103 will still be in the first position as shown in Operation of the asymmetric access door latching system 200 will be briefly discussed with reference to The foregoing description of several methods and an embodiment of the present disclosure have been presented for purposes of illustration. It is not intended to be exhaustive or to limit the present disclosure to the precise steps and/or forms disclosed, and obviously many modifications and variations are possible in light of the above description. It is intended that the scope of the present disclosure be defined by the claims appended hereto. |