JP2011053335A - Attaching/detaching mechanism and image forming device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an attaching/detaching mechanism reducing an operation force required to attach and detach an attaching/detaching member such as a cover or the like to/from a device body, and thereby improving the operability. <P>SOLUTION: In this attaching/detaching mechanism, a projection 32 formed on an inner face of a front cover 3 crosses a step part 62a of a link 6 to press the link 6 down when closing the front cover 3, a fixing lever 5 is inverted in the direction of fixation by the lowering link 6, next a fixing lever 9 is energized in the direction of fixation by tensile force of an extension spring 93 passing through an intermediate point, and the front cover 3 is pulled into the direction of closing and is held there. A rotary operation of the fixing lever 5 in the direction of fixation is assisted in accordance with the operation for closing the front cover 3 by the projection 32 and the link 6. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a cover attaching / detaching mechanism provided in, for example, an image forming apparatus (a copying machine, a printer, a facsimile, or a complex machine thereof). The present invention also relates to an image forming apparatus provided with the attachment / detachment mechanism.

  In the image forming apparatus, various opening / closing members are provided to be openable / closable with respect to the apparatus main body. Examples of the opening / closing member include a paper feed cassette that is inserted into the apparatus main body, a maintenance cover, and a door that is opened when replacement parts such as toner are exchanged. These opening / closing members are devised such that when closing to the apparatus main body side, the operation force is reduced by the action of being pulled in the closing direction by a closing mechanism having a spring or the like, and positioning at the closed position is performed. What is made is known (patent documents 1 to 4).

JP-A-6-222629 JP 2006-139052 A Japanese Patent Laid-Open No. 2001-240259 JP 2008-254841 A

  The present invention provides a reversing operation of the fixing lever in a configuration having a fixing lever that generates a pull-in force by reversing when the attaching / detaching member including the opening / closing member is attached to or detached from the apparatus main body. An object of the present invention is to provide an attaching / detaching mechanism capable of reducing the operating force by assisting and improving the operability of the attaching / detaching member, and an image forming apparatus including the attaching / detaching mechanism.

  The invention according to claim 1 is an apparatus main body, a detachable member that is detachably attached to the apparatus main body, and is supported by the apparatus main body so as to be able to rotate forward and backward via a support shaft. A fixing lever for fixing a state of being attached to the main body, and the detachable member, the fixing lever is forwardly coupled when the detachable member is attached to the apparatus main body, and the device of the detachable member The connected portion where the fixing lever is reversely released when detached from the main body, the fixing direction in which the fixing lever is connected to the connected portion, and the release direction in which the fixing lever is released from the connected portion reversed from the fixing direction. An elastic member that biases in the direction; and a rotation assisting unit that assists the rotation of the fixing lever accompanying the operation of the detachable member when the detachable member is attached to and / or detached from the apparatus main body. To It is a de-mechanism.

  The invention according to claim 2 is the invention according to claim 1, wherein the rotation assisting means has a link member connected to the fixing lever, and the attachment / detachment of the attachment / detachment member to / from the apparatus main body is performed. The detachable member is connected to or disconnected from the link member.

  According to a third aspect of the present invention, in the second aspect of the present invention, the rotation assisting unit acts when the detachable member is attached to and detached from the apparatus main body.

  The invention according to claim 4 is the invention according to claim 2 or 3, wherein the rotation assisting means is provided on the detachable member and has a protrusion connected to the link member.

  The invention according to claim 5 is the invention according to claim 2 or 3, wherein the connecting means is an elastic member provided on the detachable member and elastically connected to the link member. .

  The invention according to claim 6 is the drawer member according to any one of claims 1 to 3, wherein the detachable member is a pull-out member that is attached to the apparatus main body by being pushed in and pulled out and detached. The rotation assisting means is provided on the drawer member, and has a rack extending along a direction in which the drawer member is attached and detached, and a pinion that meshes with the rack and rotates, and the link member is connected to the pinion. It is characterized by.

  A seventh aspect of the present invention is an image forming apparatus including the attachment / detachment mechanism according to any one of the first to fifth aspects, wherein an image forming unit including a process cartridge is incorporated in the apparatus main body. The attachment / detachment member is a door member for replacing the process cartridge.

  An eighth aspect of the present invention is an image forming apparatus including the attachment / detachment mechanism according to the sixth aspect, wherein an image forming section is built in the apparatus main body, and the drawer member is the image forming section. It is a paper feed cassette for supplying paper to the printer.

  According to the first aspect of the present invention, the operating force of the detachable member when the fixing lever is reversed can be reduced, and the operability of the detachable member can be improved.

  According to the second aspect of the present invention, it is possible to effectively assist the operating force of the detachable member when either the detachable member is attached or detached.

  According to the invention of claim 3, it is possible to effectively assist the operating force of the detachable member in either case of attaching or detaching the detachable member.

  According to invention of Claim 4, a rotation assistance means can be made into a simple structure.

  According to the invention of claim 5, the rotation assist of the fixing lever is more effectively and smoothly performed by the elasticity of the elastic member.

  According to the invention of claim 6, the present invention can be applied to the drawer member with a simple structure.

  According to the seventh aspect of the invention, the operability of the process cartridge replacement door member is improved, and the process cartridge can be replaced smoothly.

  According to the invention of claim 8, the detachability of the paper feed cassette is improved, and the paper feed cassette can be exchanged smoothly.

FIG. 2 is a side view schematically showing the internal structure of the printer according to the first embodiment of the present invention. It is a side view which shows the attachment / detachment mechanism of the front cover which concerns on 1st Embodiment, Comprising: The effect | action at the time of a front cover closing is shown. It is a side view which shows the attachment / detachment mechanism of the front cover which concerns on 2nd Embodiment of this invention, Comprising: The effect | action at the time of a front cover opening is shown. The effect | action at the time of a front cover opening in the attachment / detachment mechanism of the front cover which concerns on 2nd Embodiment is shown. It is a perspective view which shows the attachment / detachment mechanism of the paper feed cassette which concerns on 3rd Embodiment of this invention. It is a top view which shows the attachment / detachment mechanism of the paper feed cassette of 3rd Embodiment, Comprising: The effect | action at the time of a paper feed cassette closing is shown. It is a top view which shows the attachment or detachment mechanism of the paper feed cassette which concerns on 4th Embodiment of this invention, Comprising: The effect | action at the time of a paper feed cassette opening is shown.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
(1) First Embodiment (1-1) Basic Configuration of Printer FIG. 1 schematically illustrates an internal configuration of a printer 1 that is an image forming apparatus according to an embodiment. As shown in FIG. 1, the printer 1 includes an apparatus main body 2, a front cover 3 that opens a front side in the apparatus main body 2 (F direction in FIG. 1 is the front of the printer 1), and an upper front side of the apparatus main body 2. An upper cover 4 is provided. In the following description, directions such as front, rear, left, and right refer to directions when the apparatus main body 2 is viewed from the front side unless otherwise noted.

  The apparatus main body 2 includes a full-color image forming unit 21, a transfer unit 23, a power supply unit 24, and a control unit 25 that are disposed opposite to each other in front of the image forming unit 21. In addition, a sheet feeding cassette 10 that stacks and stores a large number of sheets P is detachably attached to the lower portion of the apparatus body 2. The paper feed cassette 10 is pulled out rearward from the apparatus main body 2 to store the paper P therein.

  The front cover 3 is rotatably supported by the apparatus main body 2 via a hinge shaft 31 whose lower end extends in the left-right direction. The front cover 3 is rotated forward from the apparatus main body 2 to be opened, and when the front cover 3 is rotated rearward, the front cover 3 is connected to the apparatus main body 2 and closed in an upright state.

  The upper cover 4 is rotatably supported by the apparatus body 2 via a hinge shaft 41 whose rear end extends in the left-right direction. The upper cover 4 is opened by rotating upward from the apparatus main body 2 and is closed when rotated downward. The upper cover 4 is closed so as to overlap the upper end of the closed front cover 3 from the front side. Therefore, the front cover 3 cannot be opened unless the upper cover 4 is opened, and the front cover 3 is closed and then the upper cover 4 is closed.

  The image forming unit 21 mainly includes four-color image forming units 22Y, 22M, 22C, and 22K that are process cartridges arranged in a stacked state from the bottom to the top above the sheet feeding cassette 10. The image forming units 22Y, 22M, 22C, and 22K form yellow, magenta, cyan, and black toner images, respectively. The photosensitive drum 221, the charging roller 222, the developing roller 223, the photosensitive drum cleaner 224, It comprises a static eliminating roller 225 and the like. A latent image is formed on the photosensitive drum 221 by an exposure device 226 disposed behind the image forming units 22Y, 22M, 22C, and 22K.

  The transfer unit 23 is located at a position corresponding to each of the photosensitive drums 221 of the image forming units 22Y, 22M, 22C, and 22K inside the conveyance belt 232 and the conveyance belt 232 spanned between the pair of upper and lower belt rollers 231. The transfer roller 233 is disposed respectively.

  The paper P to be printed is lifted from the paper feed cassette 10 on a conveyance path 26 formed between the image forming unit 21 and the transfer unit 23 and discharged to a paper discharge tray 27 formed on the upper portion of the apparatus main body 2. Is done. The sheet conveyance path 26 is provided between the conveyance belt 232 and each photosensitive drum 221, a pair of paper feed rollers 28 </ b> A, a pickup roller pair 28 </ b> B on the upstream side of the conveyance belt 232, and a pair of fixing rollers 28 </ b> C on the downstream side of the conveyance belt 232. The paper discharge roller pair 28D is used.

  Color image information is input to the printer 1 from a personal computer or the like. When the color image information is input, one sheet P is fed from the sheet feeding cassette 10 to the sheet feeding roller pair 28A by the pickup roller pair 28B, and is electrostatically attracted to the conveying belt 232 charged by the charging device 29. It is conveyed upward. On the other hand, the photosensitive drums 221 of the image forming units 22Y, 22M, 22C, and 22K are charged by the charging roller 222, and an electrostatic latent image corresponding to the image of each color is formed on the surface of each photosensitive drum 221 by the exposure device 226. Is done. This color image is developed on the surface of the photosensitive drum 221 by each developing roller 223, and this development is transferred to the paper P that is transported upward by the transport drum 232 and developed.

  Such development from the photosensitive drum 221 to the paper P is sequentially performed at a predetermined timing in each of the image forming units 22Y, 22M, 22C, and 22K, and when passing through the black image forming unit 22K on the most downstream side, the paper P A full color toner image is formed.

  The paper P on which the full-color toner image has been transferred through the black image forming unit 22K passes through the fixing roller pair 28C, and the full-color toner image is fixed to the paper P by pressing and heating by the fixing roller pair 28C. Is done. The paper P that has passed through the fixing roller pair 28C is discharged to the paper discharge tray 27 by the paper discharge roller pair 28D.

(1-2) Front Cover Attachment / Removal Mechanism The basic configuration and operation of the printer 1 have been described above. Next, the attachment / detachment mechanism of the front cover 3 with respect to the apparatus main body 2 will be described with reference to FIG.

  A fixing lever 5 is provided at the upper end of the apparatus body 2 as shown in FIG. The fixing lever 5 is disposed in a pair of left and right states at the upper end portion of the apparatus main body 2. The left and right fixing levers 5 are fixed to a single support shaft 54 extending in the left-right direction, and the apparatus main body 2 is rotatable in the A-B direction while being integrally connected via the support shaft 54. It is supported by.

  The fixed lever 5 is a plate piece whose central portion is bent at an angle of about 120 °, and is a first piece portion 51 that extends from the bent portion to one side, and a bent portion that extends from the first piece portion 51 toward the B direction. A second piece 52 is provided. The support shaft 54 is fixed to the bent portion. In FIG. 2C, the fixing lever 5 is urged in the fixing direction, which is the A direction, by a tension spring 53 spanned between the first piece 51 and the apparatus main body 2. Further, when the fixing lever 5 is rotated in the releasing direction, which is the B direction, from the state of being biased in the fixing direction, the fixing lever 5 is reversed through an intermediate point where the tension of the tension spring 53 shown in FIG. Then, it is urged by the tension spring 53 in the releasing direction (B direction) as shown in FIG.

  A long hole 52 a extending along the second piece portion 52 is formed in the second piece portion 52 of the fixing lever 5. And the upper end part of the link 6 extended in the up-down direction is attached to this long hole 52a so that a movement along the long hole 52a is possible via the pin 61, and relative rotation is possible. The link 6 is supported by a guide member (not shown) so as to be movable along the vertical direction (the longitudinal direction of the link 6). At the lower end portion of the link 6, a convex portion 62 that protrudes in the lateral direction (the front side in the drawing) is formed, and on the upper surface of the convex portion 62, a step portion 62 a that is inclined forward and downward is formed.

  The front cover 3 whose lower end is rotatably supported by the apparatus main body 2 via the hinge shaft 31 is rotated forward from the apparatus main body 2 to be opened, and when rotated rearward, the front cover 3 is connected to the apparatus main body 2 side. Closed in an upright state.

  A pin 31 protruding in the lateral direction is formed at a position corresponding to the left and right fixing levers 5 at the upper end of the front cover 3. Further, a protrusion 32 that protrudes toward the apparatus main body 2 is formed below the middle portion in the vertical direction of the front cover 3. The lower surface of the protrusion 32 is inclined forward and downward. In the first embodiment, the rotation assisting means of the present invention is constituted by the projection 32 of the front cover 3 and the link 6.

Hereinafter, the closing operation of the front cover 3 will be described.
In the state where the front cover 3 is opened, as shown in FIG. 2A, the fixing lever 5 is urged in the direction B by the tension spring 53, the first piece 51 extends to the front side, and the second piece 52 Is in a released state inclined downward. At this time, the link 6 is lifted by the fixing lever 5 and positioned upward.

  Next, when the front cover 3 is closed, the projection 32 of the front cover 3 rides on the stepped portion 62a of the convex portion 62 of the link 6 as shown in FIGS. The fixing lever 5 rotates in the A direction. Then, the tension spring 53 passes through the intermediate point, and the fixing lever 5 is reversed and biased in the A direction, and the fixing lever 5 is further rotated in the A direction by the pulling force of the tension spring 53.

  As a result, the front cover 3 is pulled in the closing direction via the pin 31 that has entered the inside of the first piece 51, and the front cover 3 is biased in the A direction by the tension spring 53 as shown in FIG. The fixed lever 5 is held in the closed state on the apparatus main body 2 side. On the other hand, in order to open the front cover 3, the front cover 3 may be rotated to the near side, and the fixing lever 5 is rotated in the reverse direction to the above to be in the original released state.

  According to the first embodiment, the protrusion 32 rotates the fixing lever 5 in the fixing direction via the link 6 as the front cover 3 closes. Thereby, the force which closes the front cover 3 until the tension spring 53 reaches an intermediate point and the fixing lever 5 reverses is assisted. Therefore, the operation force for closing the front cover 3 until the fixing lever 5 is reversed in the fixing direction is reduced, and the operability is improved. Further, such an auxiliary operation can be realized with a simple configuration such as the protrusion 32 connected to the link 6.

(2) Second Embodiment Next, an attachment / detachment mechanism for the front cover 3 according to a second embodiment based on the first embodiment will be described with reference to FIGS. 3 and 4. As shown in these drawings, in the second embodiment, the elongated hole 52a is not formed in the second piece 52 of the fixed lever 5, and the upper end of the link 6 is simply connected to the fixed lever 5 via the pin 61. It is mounted for rotation. A long hole 63 extending in the vertical direction is formed at the lower end portion of the link 6, and a pin 64 is movably fitted in the long hole 63 instead of the convex portion 62. On the other hand, a leaf spring 33 that is curved upward is fixed below the protrusion 32 of the front cover 3. In the second embodiment, in addition to the protrusion 32 and the link 6 of the front cover 3, the leaf spring 33 constitutes the rotation assisting means of the present invention.

  According to the second embodiment, when the front cover 3 is closed as shown in FIG. 3A, the front cover 3 is closed by the fixing lever 5 biased in the fixing direction (direction A) by the tension spring 53. State is maintained. At this time, the protrusion 32 is disposed above the pin 64, and the leaf spring 33 is disposed below the pin 64. Next, as shown in FIG. 3B, when the front cover 3 is opened, the leaf spring 33 lifts the link 6 via the pin 64, whereby the fixing lever 5 rotates in the release direction (B direction). Then, when the tension spring 53 passes the intermediate point and the fixing lever 5 is reversed, the front cover 3 can be opened.

  Next, when the front cover 3 is closed, as shown in FIGS. 4A to 4B, the projection 32 rides on the pin 64, whereby the link 6 is pushed down, and the fixing lever 5 is fixed in the fixing direction (A direction). And the tension spring 53 is turned through the intermediate point, the fixing lever 5 is reversed, and is urged in the fixing direction. As a result, the front cover 3 is held in the closed state shown in FIG.

  According to the second embodiment, when the front cover 3 is closed, the projection 32 of the front cover 3 pushes down the link 6 to assist the rotation of the fixing lever 5 in the fixing direction, as in the first embodiment. When the front cover 3 is opened, the reverse of the fixing lever 5 is assisted by the leaf spring 33. Therefore, the operation force is reduced in any operation when the front cover 3 is opened or closed.

(3) Third Embodiment Next, a third embodiment in which the present invention is applied to the paper feed cassette 10 will be described with reference to FIGS. 5 and 6. As shown in FIG. 5, the paper feed cassette 10 is inserted and set in a storage space 201 provided in the apparatus main body 2, and is pulled out of the storage space 201 and replenished with paper P.

  Guide rails 11 are formed on both side walls of the paper feed cassette 10, and the paper feed cassette 10 is inserted into the storage space 201 by sliding these guide rails 10 into the guide grooves 202 on the apparatus body 2 side. , It is set at a predetermined position in the apparatus main body 2. A rack 12 having teeth formed inside is fixed to one side of the lower surface of the paper feed cassette 10. A pin 13 is provided at a predetermined position on the lower surface of the paper feed cassette 10.

  On the other hand, on the back side of the bottom surface of the storage space 201 in the apparatus main body 2, a pinion 7 in which teeth that mesh with the rack 12 are formed on the outer peripheral surface is provided. The pinion 7 is supported so as to be rotatable in the CD direction via a shaft 71 extending in the vertical direction as shown in FIG. One end of a two-joint type link 8 is rotatably supported on the outer peripheral portion of the upper surface of the pinion 7 via a pin 81. The link 8 extends in a direction opposite to the rack 12, and the other end is rotatably attached to the fixing lever 9 via a pin 82.

  The fixing lever 9 is bent in an L shape having a long piece portion 91 and a short piece portion 92, and is attached to the apparatus main body 2 via a support shaft 94 parallel to the shaft 71 of the pinion 7 attached to the bent portion. It is supported so as to be rotatable in the −F direction. The other end of the link 8 is attached to the long piece portion 91. Further, a tension spring 93 is bridged between the long piece portion 91 and the apparatus main body 2.

  In FIG. 6A, the fixing lever 9 is in a standby state waiting for insertion of the paper feed cassette 10, and the fixing lever 9 at this time is urged in the release direction which is the E direction by the tension spring 93. In this state, the pin 13 of the paper feed cassette 10 is formed at a position where it can enter the inside of the fixing lever 9. When the pinion 7 rotates in the C direction from the state of FIG. 6A, the fixing lever 9 is pushed by the link 8 and rotates in the fixing direction which is the F direction, and the tension of the tension spring 93 shown in FIG. Inverts through the maximum midpoint. As shown in FIG. 6C, the link 8 is bent, and the fixing lever 9 is held in a state of being biased in the fixing direction by the tension spring 93. In the third embodiment, the rotation assisting means of the present invention is constituted by the rack 12 and the pin 13 on the paper feed cassette 10 side and the pinion 7 and the link 8 on the apparatus main body 2 side.

  According to the third embodiment, when the paper feed cassette 10 is inserted into the storage space 201, the rack 12 meshes with the pinion 7 and the pinion 7 starts to rotate in the C direction as shown in FIG. At this time, the pin 13 has advanced to a position where it enters the inside of the stationary lever 9 in the standby state. When the pinion 7 rotates, the fixing lever 9 is pushed by the link 8 and rotates in the fixing direction (F direction), and the fixing lever 9 passes through an intermediate point where the tension of the tension spring 93 shown in FIG. 9 is inverted.

  When the fixing lever 9 is reversed, the long piece portion 91 pulls the sheet cassette 10 into the storage space 201 through the pin 13. Then, as shown in FIG. 6C, the link 8 is bent, and the state where the sheet feeding cassette 10 is stored in the storage space 201 is held by the fixing lever 9 urged in the fixing direction. On the other hand, when the paper feed cassette 10 is pulled out from the storage space 201 to some extent, the fixing lever 9 rotates in the reverse direction to the above and returns to the original released state.

  According to the third embodiment, the fixing lever 9 is rotated in the fixing direction via the rack 12, the pinion 7 and the link 8 in accordance with the operation of inserting the paper feed cassette 10. Thereby, the force for inserting the paper feed cassette 10 until the tension spring 93 reaches the intermediate point and the fixing lever 9 is reversed is assisted. Therefore, the operating force for inserting the paper feed cassette 10 when the fixing lever 9 is reversed in the fixing direction is reduced, and the operability is improved.

(4) Fourth Embodiment Next, a fourth embodiment, which is a modification of the third embodiment, will be described with reference to FIG. The fourth embodiment is configured to assist the reversal of the fixing lever 9 when the paper feed cassette 10 is pulled out. For this purpose, a two-joint second link 85 is bridged between the end of the short piece 92 of the fixing lever 9 and the pinion 7 via pins 88 and 89. The attachment location of the second link 85 to the pinion 7 is on the C direction side with respect to the link 8, and the second link 85 intersects with the lower side of the link 8 being overlapped.

  FIG. 7A shows a state in which the paper feed cassette 10 corresponding to FIG. 6C is inserted. When the paper feeding cassette 10 is pulled out from this state, the pinion 7 is rotated in the D direction by the retreating rack 12, and the fixing lever 9 is reversed and rotated in the releasing direction (E direction). When the sheet cassette 10 is further pulled out, as shown in FIGS. 7B to 7C, the tension spring 93 passes the intermediate point and the fixing lever 9 is further reversed, whereby the sheet cassette 10 is pulled out. . In the fourth embodiment, the rotation assisting means of the present invention is configured by the second link 85 in addition to the rack 12 and the pin 13, the pinion 7 and the link 8.

  According to the fourth embodiment, when the paper feeding cassette 10 is pulled out, the fixing lever 9 is rotated in the releasing direction by the second link 85 to assist the reversal of the fixing lever 9. Therefore, the operation force is reduced in both the operation of inserting and pulling out the paper feed cassette 10.

  The present invention is not limited to the above-described embodiment, and examples of the detachable member include a door for replacing a process cartridge constituting each of the image forming units 22Y, 22M, 22C, and 22K.

  The detachable member in the present invention is a member such as a cover that is opened and closed with respect to the apparatus main body as in the first embodiment and the second embodiment, as in the third embodiment and the fourth embodiment. Examples include a member that can be attached to and detached from the apparatus main body in various modes, such as a drawer member that is inserted into and withdrawn from the apparatus main body.

1 ... Printer (image forming apparatus)
2 ... Main body 3 ... Front cover (detachable member)
5, 9 ... fixed lever 6, 8, 85 ... link (rotation assisting means)
7 ... pinion (rotation assisting means)
10: Paper cassette (detachable member, drawer member)
12 ... Rack (rotation assisting means)
13 ... Pin of paper cassette (connected part)
21: Image forming unit 22Y, 22M, 22C, 22K ... Image forming unit (process cartridge)
31 ... Front cover pin (connected part)
32 ... protrusion (rotation assisting means)
33 ... leaf spring (elastic member, rotation assist means)
53, 93 ... tension spring (elastic member)
54, 94 ... spindle

Claims (8)

The device body;
A detachable member that is detachably attached to the apparatus body;
A fixing lever that is supported by the apparatus main body via a support shaft so as to be able to rotate forward and backward, and that fixes the state where the detachable member is attached to the apparatus main body,
The fixing lever is provided on the detachable member, and the fixing lever is forwardly connected when the detachable member is attached to the apparatus main body, and the fixing lever is reversely detached when the detachable member is detached from the apparatus main body. Connected parts;
An elastic member that urges the fixing lever in two directions: a fixing direction in which the fixing lever is connected to the connected portion; and a release direction in which the fixing lever is released from the connected portion reversed from the fixing direction;
Rotation assisting means for assisting rotation of the fixing lever accompanying the operation of the detachable member when the detachable member is attached to and / or detached from the apparatus main body;
An attachment / detachment mechanism comprising:   The rotation assisting means has a link member connected to the fixed lever, and the attachment / detachment member is connected to or disconnected from the link member as the attachment / detachment of the attachment / detachment member to / from the apparatus main body. The attachment / detachment mechanism according to claim 1.   The attachment / detachment mechanism according to claim 2, wherein the rotation assisting unit acts when the attachment / detachment member is attached to and detached from the apparatus main body.   4. The attachment / detachment mechanism according to claim 2, wherein the rotation assisting unit includes a protrusion provided on the attachment / detachment member and connected to the link member. 5.   The attachment / detachment mechanism according to claim 2 or 3, wherein the connection means is an elastic member provided on the attachment / detachment member and elastically connected to the link member.   The detachable member is a drawer member that is pushed in and attached to the apparatus main body, and is pulled out and detached, and the rotation assisting means is provided in the drawer member, and follows a direction in which the drawer member is attached and detached. The attachment / detachment mechanism according to any one of claims 1 to 3, further comprising: a rack extending in a row, and a pinion that meshes with the rack and rotates, wherein the link member is connected to the pinion. An image forming apparatus comprising the attachment / detachment mechanism according to claim 1,
An image forming unit including a process cartridge is built in the apparatus main body,
The image forming apparatus, wherein the detachable member is a door member for replacing the process cartridge. An image forming apparatus comprising the attachment / detachment mechanism according to claim 6,
An image forming unit is built in the apparatus body,
The image forming apparatus according to claim 1, wherein the drawer member is a paper feed cassette that supplies paper to the image forming unit.

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