JP5807449B2 - Image forming apparatus - Google Patents

Description

  The present invention relates to an image forming apparatus including an endless belt facing a plurality of photosensitive drums and a cleaning unit that collects toner on the endless belt.

  Conventionally, a plurality of photosensitive drums arranged to face an endless belt, a plurality of developing cartridges having a developing roller for supplying toner to the photosensitive drum, and a cleaning unit having a cleaning roller for collecting toner on the endless belt An image forming apparatus is known (see Patent Document 1). In this technique, the photosensitive drums, the developing cartridges, and the cleaning unit described above are integrally supported by a drawer, and the drawer can be pulled out from the apparatus main body.

  Specifically, the drawer supports the photosensitive drums and the cleaning roller so as to be exposed to the outside of the drawer, the contact positions where the photosensitive drums and the cleaning roller contact the endless belt, and the photosensitive drums and the cleaning roller are the endless belt. Between each of the photosensitive drums and the cleaning roller, and a drawing position where the photosensitive drum and the cleaning roller are located outside the apparatus main body. As a result, the developing cartridge or the like can be exchanged by pulling the drawer from the apparatus main body in the order of the contact position, the separation position, and the pull-out position.

JP 2009-210937 A

  However, in the technique described above, since the cleaning roller is exposed outside the drawer, the user may accidentally touch the cleaning roller located at the drawing position. Further, when the drawer is pulled out, there is a possibility that the toner is scattered from the cleaning roller to the outside of the drawer.

  Therefore, the present invention can prevent toner (developer) from being scattered from the cleaning roller (cleaning member) when the drawer (drawing member) is pulled out, and can also prevent the user from touching the cleaning roller by mistake. An object is to provide an image forming apparatus.

In order to solve the above problems, an image forming apparatus according to the present invention includes an apparatus main body, an endless belt provided in the apparatus main body, a plurality of photosensitive drums arranged to face the endless belt, and the plurality of the plurality of photosensitive drums. A photosensitive drum is rotatably provided, a contact position where the photosensitive drum contacts the endless belt, a separation position where the photosensitive drum is separated from the endless belt, and a drawer where the photosensitive drum is pulled out of the apparatus main body. A pulling member movable to a position; a cleaning unit provided on the pulling member and having a cleaning member for collecting toner on the endless belt; a covering position covering the cleaning member; and the cleaning member as the endless belt. Cover member that can be moved to an exposed position that is open to be exposed toward the side , In conjunction with movement of said drawer member, and a closing mechanism for moving the cover member and the exposed position and the covering position.
The opening / closing mechanism is configured to move the cover member from the exposed position to the covering position while the drawing member moves from the contact position to the drawing position.

  According to this configuration, when the drawing member is pulled out from the contact position to the drawing position, the cover member is closed and covers the cleaning member, so that the toner on the cleaning member can be prevented from scattering. Further, since the cleaning member is covered with the cover member in the state where the drawing member is pulled out, it is possible to prevent the user from touching the cleaning member by mistake.

  In the above-described configuration, the opening / closing mechanism is configured to move the cover member from the exposed position to the covering position while the drawer member moves from the contact position to the separated position. Is desirable.

  According to this, since the cover member is already closed at the separation position, the toner can be prevented from scattering when the extraction member is moved from the separation position to the extraction position.

  In the above-described configuration, the opening / closing mechanism includes a main body side contact portion provided in the apparatus main body, and a cover side contact portion provided in the cover member and in contact with the main body side contact portion, While the drawer member moves from the separated position to the contact position, the cover-side contact portion is pushed by the body-side contact portion so that the cover member moves from the covering position to the exposed position. It may be configured.

  In the above-described configuration, it is desirable that the cover member is rotatable and has a weight balance that is biased toward the covering position.

  According to this, the cover member can be returned from the exposed position to the covering position without providing other members such as a spring.

  In the above-described configuration, the opening / closing mechanism may be configured to move the cover member from the exposed position to the covering position while the drawer member moves from the separated position to the drawer position. Good.

  Further, in the above-described configuration, the opening / closing mechanism is provided in a main body side contact portion provided in the apparatus main body, a biasing member that biases the cover member to the covering position, and the drawer member, and the exposure member A link mechanism capable of swinging between a pressing posture corresponding to the position and a release posture corresponding to the covering position, wherein the pulling member moves from the pulling position to the separation position. When the cover member is in contact with the main body side contact portion and swings from the release posture to the pressing posture, the cover member is pressed to the exposed position, and the drawing member moves from the separation position to the drawing position. In this case, the pressing force applied to the cover member may be released by contacting the main body side contact portion and swinging from the pressing posture to the releasing posture.

  Further, in the above-described configuration, the cleaning unit is detachably provided on the drawer member, and the drawer member swings by contacting the cleaning unit when the cleaning unit is mounted, thereby linking the link mechanism. It is desirable that a return member for returning the pressing posture to the releasing posture is provided.

  According to this, even when the link mechanism is in the pressing posture in a state where the cleaning unit is removed from the drawing member, when the new cleaning unit is mounted, the link mechanism is returned to the release posture, and the link mechanism And the cover member can be corrected to an appropriate positional relationship.

  According to the present invention, when the drawer member is pulled out, it is possible to prevent the developer from scattering from the cleaning member and to prevent the user from touching the cleaning member by mistake.

It is explanatory drawing which shows the color printer which concerns on embodiment of this invention. It is explanatory drawing which shows the state in which a drawer is located in a separation position. It is explanatory drawing which shows the state in which a drawer is located in a drawer position. It is explanatory drawing (a), (b) which shows operation | movement of an opening / closing mechanism. It is explanatory drawing which shows the opening / closing mechanism which concerns on other embodiment. It is explanatory drawing which shows the relationship between the main body side contact part for opening, and a link mechanism. It is explanatory drawing which shows the relationship between the main body side contact part for obstruction | occlusion, and a link mechanism. It is explanatory drawing which shows the relationship between a cleaning unit, a return member, and a link mechanism. It is explanatory drawing which shows the state which the link mechanism returned to the cancellation | release attitude | position by the return member.

  Next, a color printer as an example of an image forming apparatus according to an embodiment of the present invention will be described in detail with reference to the drawings as appropriate. In the following description, the direction will be described based on the user who uses the color printer. That is, the left side in FIG. 1 is “front”, the right side is “rear”, the front side is “right”, and the back side is “left”. Also, the vertical direction in FIG.

  As shown in FIG. 1, the color printer 1 includes a paper feeding unit 30, a scanner unit 40, a drawer 50 as an example of a drawing member, a transfer unit 60, a cleaning unit 70, and a fixing unit in an apparatus main body 10. Device 80.

  A paper discharge tray 11 on which the paper S discharged from the apparatus main body 10 is placed is provided on the upper part of the apparatus main body 10.

  The paper feed unit 30 is provided in the lower part of the apparatus main body 10, and a paper feed tray 31 that stores the paper S, and a transfer position of the paper S from the paper feed tray 31 (between the endless belt 63 and the secondary transfer roller 65). ) Is fed. The sheets S in the sheet feeding tray 31 are separated one by one by the sheet feeding mechanism 32 and conveyed to the transfer position.

  The scanner unit 40 is disposed above the paper feeding unit 30 and includes a laser light emitting unit, a polygon mirror, a lens, a reflecting mirror, and the like (not shown). In the scanner unit 40, the laser beam is irradiated on the surface of the photosensitive drum 51 by high-speed scanning through a path indicated by a two-dot chain line in the drawing.

  The drawer 50 is disposed below the endless belt 63 (between the endless belt 63 and the scanner unit 40), and includes four photosensitive drums 51, four well-known chargers (not shown), four developing cartridges 52, 1 Two cleaning units 70. Each photosensitive drum 51 is provided so as to be rotatable with respect to the drawer 50, and is disposed so as to face the lower surface of the endless belt 63.

  Each developing cartridge 52 is provided with a developing roller 53, a known supply roller (not shown), a layer thickness regulating blade, a toner storage chamber, and the like. The developing cartridge 52 is provided at a position where the developing roller 53 faces upward and the rotating shaft of the developing roller 53 is disposed below the rotating shaft of the photosensitive drum 51. Each developing cartridge 52 and the cleaning unit 70 are detachably attached to the drawer 50.

  The drawer 50 is supported so as to be movable in the front-rear direction with respect to the apparatus main body 10 and can be pulled out from an opening (not shown) formed in the front wall of the apparatus main body 10 (see FIG. 2). ). Specifically, the drawer 50 includes a contact position where each photosensitive drum 51 contacts the endless belt 63 (position shown in FIG. 1), a separation position where each photosensitive drum 51 separates from the endless belt 63 (position shown in FIG. 2), The photosensitive drum 51 is movable to a drawing position (position shown in FIG. 3) drawn out of the apparatus main body 10.

  As a means for moving the drawer 50 to the contact position / separation position / drawing position, for example, a mechanism for vertically moving a rail that supports the drawer 50 so as to be movable in the front-rear direction, a mechanism extending in the front-rear direction, and A rail whose rear end is bent so as to extend obliquely upward and rearward may be employed.

  The transfer unit 60 is provided above the drawer 50, via a driving roller 61, a driven roller 62, an endless endless belt 63 stretched between the driving roller 61 and the driven roller 62, and an endless belt 63. The four primary transfer rollers 64 disposed opposite to the photosensitive drum 51 and the secondary transfer roller 65 disposed opposite to the driving roller 61 via the endless belt 63 are provided.

  In such a drawer 50 and transfer unit 60, first, the surface of the photosensitive drum 51 is uniformly charged by a charger and then exposed by the scanner unit 40, so that the photosensitive drum 51 is based on image data. An electrostatic latent image is formed. The toner in the toner storage chamber is carried on the surface of the developing roller 53 via a supply roller.

  The toner carried on the surface of the developing roller 53 is supplied from the developing roller 53 to the electrostatic latent image on the photosensitive drum 51. As a result, the electrostatic latent image is visualized and a toner image is formed (carried) on the photosensitive drum 51. The toner images of the respective colors formed on the respective photosensitive drums 51 are sequentially transferred onto the endless belt 63 in a superimposed manner. Then, the sheet S conveyed from the sheet feeding unit 30 passes through the transfer position between the endless belt 63 and the secondary transfer roller 65, whereby the toner image on the endless belt 63 is transferred to the sheet S.

  The cleaning unit 70 is a mechanism for collecting the toner remaining on the endless belt 63, and a part thereof (cleaning roller 71) is downstream of the secondary transfer roller 65 in the rotation direction of the endless belt 63, and The plurality of photosensitive drums 51 are disposed so as to come into contact with a portion upstream. Specifically, the cleaning unit 70 is detachably supported by the drawer 50 at a position in front of the plurality of photosensitive drums 51.

  In the cleaning unit 70, the toner remaining on the endless belt 63 without being transferred to the paper S at the transfer position between the endless belt 63 and the secondary transfer roller 65 is collected. The structure of the cleaning unit 70 will be described in detail later.

  The fixing device 80 is provided on the upper rear side of the transfer unit 60, and includes a heating roller 81 and a pressure roller 82 that faces the heating roller 81 and presses the heating roller 81. In the fixing device 80, the sheet S passes between the heating roller 81 and the pressure roller 82, so that the toner image transferred onto the sheet S is thermally fixed. The heat-fixed paper S is conveyed by a paper discharge roller (not shown) and discharged onto the paper discharge tray 11.

<Detailed Structure of Cleaning Unit 70>
Next, the structure of the cleaning unit 70 will be described in detail.
As shown in FIG. 4A, the cleaning unit 70 is supported by a cleaning roller 71 as an example of a cleaning member, a casing 72 that rotatably supports the cleaning roller 71, and a casing 72 that is rotatable. The cover member 73 is provided.

  The cleaning roller 71 is disposed so as to be exposed upward of the housing 72 and contact the outer peripheral surface of the endless belt 63, and between the cleaning roller 71 (not shown) disposed on the inner peripheral surface of the endless belt 63. The toner on the endless belt 63 is collected by applying a collection bias.

  The housing 72 includes a cleaning roller (not shown) that collects the toner on the cleaning roller 71, and a blade (not shown) that scrapes off the toner on the collecting roller to a lower portion of the housing 72 in addition to the cleaning roller 71.

  The cover member 73 has a covering position that covers the cleaning roller 71 (position shown in FIG. 4B) and an exposed position that opens the cleaning roller 71 so as to expose it toward the endless belt 63 side (position shown in FIG. 4A). ) And turnable (movable). Specifically, the cover member 73 includes a substantially U-shaped cover main body portion 73A that covers both end surfaces and the upper half of the outer peripheral surface of the cleaning roller 71, and weight portions 73B provided at both end portions of the cover main body portion 73A. And.

  The cover main body 73A includes a fan-shaped side wall A1 disposed on the left and right sides of the housing 72, and an arc-shaped upper wall A2 that connects the arc-shaped ends of the side wall A1. The center portion of A1 is rotatably supported by the casing 72. The weight portion 73B is fixed to the center portion of the side wall A1 of the cover main body portion 73A, and can rotate integrally with the cover main body portion 73A with respect to the housing 72.

  As a result, in a state where no force is applied to the cover member 73 (the state shown in FIG. 4B), the center portion of the side wall A1 is directed downward by the weight portion 73B, so that the upper portion on the opposite side of the center portion. The wall A2 is positioned above the cleaning roller 71, that is, at the covering position. That is, since the cover member 73 is formed with a weight balance that is urged to the covering position, the cover member 73 can be returned from the exposed position to the covering position without providing other members such as a spring. It has become.

  The cover member 73 is rotated by the opening / closing mechanism 100 to the covering position and the exposure position in conjunction with the movement of the drawer 50. Specifically, the opening / closing mechanism 100 includes a main body side contact portion 110 and a cover side contact portion 120.

  The main body side contact portion 110 is provided on at least one of the left and right side walls of the apparatus main body 10 and is disposed at a position where it can contact the cover side contact portion 120 that moves from the separated position to the contact position.

  The cover-side contact portion 120 is provided at a position away from the center (rotation center) of at least one of the left and right side walls A1 of the cover member 73 (the side wall A1 corresponding to the main body-side contact portion 110). Accordingly, when the cover side contact portion 120 contacts the lower surface of the main body side contact portion 110 while the drawer 50 moves from the separated position to the contact position, the main body side contact portion 110 causes the cover side contact portion 120 to contact. Is pushed downward, and the cover member 73 is rotated clockwise from the covering position to the exposed position.

  Further, when the drawer 50 is moved from the contact position to the separation position, the cover member 73 is automatically rotated from the exposure position to the covering position by the weight of the weight portion 73B. Therefore, according to this structure, since the cover member 73 is already closed at the separation position, it is possible to prevent the toner from being scattered when the drawer 50 is moved over a long distance from the separation position to the extraction position. It has become.

  Further, as shown in FIG. 3, even when the drawer 50 is pulled out, the cleaning roller 71 is covered with the cover member 73, so that it is possible to prevent the user from touching the cleaning roller 71 by mistake. ing. Specifically, the drawer 50 is frequently pulled out to the drawing position for the purpose of replacing the developing cartridge 52. When the cleaning unit is provided in the drawer 50 that is frequently pulled out as described above, if the cover is not provided, the user's hand is required. May get dirty frequently by touching the cleaning roller.

  On the other hand, in this embodiment, since the cover member 73 that closes in conjunction with the drawing operation of the drawer 50 is provided, it is possible to reliably prevent the user's hand from becoming dirty. Further, in the embodiment in which the cleaning unit 70 is provided on the front side of each photosensitive drum 51 as in this embodiment, there is a higher possibility that the user's hand gets dirty when the developing cartridge 52 is replaced. The invention becomes effective.

  In addition, this invention is not limited to the said embodiment, It can utilize with various forms so that it may illustrate below.

  In the embodiment, the cover member 73 is rotated from the exposed position to the covering position when the drawer 50 moves from the contact position to the separated position. However, the present invention is not limited to this, and the drawer member is pulled out from the contact position. While moving to the position, the cover member may be moved from the exposed position to the covering position. For example, the cover member may be moved from the exposed position to the covering position while the drawer 50 moves from the separated position to the drawn position (see FIGS. 2 and 3).

  Specifically, instead of the cleaning unit 70 and the opening / closing mechanism 100 in the embodiment, a cleaning unit 200 and an opening / closing mechanism 300 as shown in FIGS. 5 to 9 may be provided. Below, the form of FIGS. 5-9 is demonstrated. In the following description, the same reference numerals are given to members having substantially the same structure as in the above embodiment, and the description thereof is omitted.

  As shown in FIG. 5, the cleaning unit 200 is provided detachably with respect to the drawer 50, and mainly includes a cleaning roller 71, a cover member 210, and a housing 220. The cover member 210 includes a cover main body portion 211 that covers the cleaning roller 71, a pair of left and right first arm portions 212 that rotatably support the left and right sides of the front end portion of the cover main body portion 211, and the rear end of the cover main body portion 211. And a pair of left and right second arm parts 213 that rotatably support the left and right sides of the part.

  The first arm portion 212 is formed so as to extend in a substantially vertical direction, and a substantially central portion thereof is rotatably supported by the left and right side walls 221 of the housing 220, and a torsion spring 310 as an example of an urging member. Is always biased to the covering position (position in FIG. 5). The torsion spring 310 is provided between the housing 220 and the first arm portion 212 such that each end thereof engages with the housing 220 and the first arm portion 212.

  A protrusion 320 that protrudes outward in the left-right direction is formed at the lower end of the first arm portion 212. The protrusion 320 is configured to be pushed forward by a link mechanism 330 described later.

  The second arm portion 213 is formed to be shorter than the first arm portion 212 and is rotatably supported at appropriate positions on the left and right side walls 221 of the housing 220. When the protrusion 320 is pushed forward by the link mechanism 330, the cover member 210 configured as described above rotates from the covering position to the exposed position (the position in FIG. 7), and the pressing force by the link mechanism 330 is reduced. When released, the urging force of the torsion spring 310 automatically returns from the exposed position to the covering position.

  As shown in FIGS. 6 and 7, the opening / closing mechanism 300 includes the torsion spring 310 and the protrusion 320, the link mechanism 330, the opening main body side contact portion 341, and the closing main body side contact portion 342. It is configured with.

  The link mechanism 330 is provided on at least one of the left and right side walls of the drawer 50, and between the pressing posture corresponding to the exposed position (the posture in FIG. 7) and the releasing posture corresponding to the covering position (the posture in FIG. 6). It can swing. Specifically, the link mechanism 330 includes a pressing arm 331 that is rotatably supported by the drawer 50, a regulating arm 332 that regulates the attitude of the pressing arm 331, and a pressing attitude and a releasing attitude of the pressing arm 331. And a coil spring 333 for switching between the two.

  The pressing arm 331 is a long member, one end 331A of which is rotatably supported by the drawer 50, and presses the projection 320 of the first arm 212 described above on the other end side. It is configured as follows. On the other end side of the pressing arm 331, a long hole 331B is formed along the longitudinal direction of the pressing arm 331.

  The restriction arm 332 is a long member, one end portion 332A thereof is rotatably supported by the drawer 50, the other end portion 332B protrudes on both sides in the left-right direction, and the length of the pressing arm 331 on the inner side in the left-right direction. While being movably engaged with the hole 331B, it protrudes outward in the left-right direction through a hole (not shown) formed in the drawer 50. The restriction arm 332 is in a posture substantially orthogonal to the pressing arm 331 in each posture so that the pressing arm 331 does not rotate by the biasing force of the coil spring 333 in both the pressing posture and the releasing posture. Is provided.

  The upper end of the coil spring 333 is rotatably supported by the drawer 50, and the lower end of the coil spring 333 is rotatably supported by the other end 332B of the restriction arm 332. An urging force that pulls the arm 331 toward the upper end side is generated.

  The opening main body side contact portion 341 is provided in the apparatus main body 10 so as to be positioned at a position where it comes into contact with the other end portion 332B of the restriction arm 332 of the link mechanism 330 in the release posture. On the other hand, the closing main body side contact portion 342 is provided in the apparatus main body 10 so as to be located at a position where it comes into contact with the other end portion 332B of the restriction arm 332 of the link mechanism 330 in the pressing posture.

  Specifically, since the other end portion 332B of the restricting arm 332 of the link mechanism 330 is positioned at the upper position when the pressing posture is set to the releasing posture, the closing main body side contact portion 342 is used for opening. It is provided in front of and above the main body side contact portion 341. Thus, when the drawer 50 is mounted, the other end portion 332B of the regulating arm 332 does not interfere with the closing main body side contact portion 342 but contacts only the opening main body side contact portion 341, and the drawer 50 is pulled out. In some cases, the other end portion 332B of the restriction arm 332 is in contact with only the closing main body contact portion 342 without interfering with the opening main body contact portion 341.

Hereinafter, the operation of the link mechanism 330 will be described.
When the drawer 50 is moved from the pull-out position to the separation position, the other end 332B of the restriction arm 332 of the link mechanism 330 that is in the release posture is positioned below the closing main body side contact portion 342. Without interfering with the closing main body side contact portion 342, it passes through the lower side of the closing main body side contact portion 342 and contacts the opening main body side contact portion 341. The other end portion 332B in contact with the opening main body side contact portion 341 is relatively pushed forward (counterclockwise in the drawing) by the opening main body side contact portion 341, so that the link mechanism 330 is released. The cover member 210 is pressed to the exposed position by the link mechanism 330.

  Further, when the drawer 50 is moved from the separated position to the pulled-out position, the other end portion 332B of the restriction arm 332 of the link mechanism 330 that is in the pressing posture is positioned above the opening main body side contact portion 341. Therefore, it passes through the upper side of the opening main body side contact part 341 without interfering with the opening main body side contact part 341 and comes into contact with the closing main body side contact part 342. When the other end 332B in contact with the closing main body contact portion 342 is relatively pushed backward (clockwise in the drawing) by the closing main body contact portion 342, the link mechanism 330 is released from the pressing posture. Since the pressing force from the link mechanism 330 to the cover member 210 is released by swinging in the posture, the cover member 210 returns to the covering position by the urging force of the torsion spring 310.

  5 to 9, the opening main body side contact portion 341 and the closing main body side contact portion 342 are separately configured. However, depending on the structure of the link mechanism, it may be configured as one part. Also good.

  Further, in this structure, as shown in FIG. 8, when the cleaning unit 200 is mounted, the return member 400 that swings by contacting the cleaning unit 200 and returns the link mechanism 330 from the pressing posture to the releasing posture is provided. The drawer 50 is provided to be swingable. Specifically, the return member 400 is a long member extending substantially in the vertical direction, and its substantially central portion is rotatable to at least one of the left and right side walls of the drawer 50 (the side wall on which the link mechanism 330 is located). It is supported by.

  The lower end portion 410 of the return member 400 protrudes inward in the left-right direction, and can be engaged from the front side with the pressing arm 331 of the link mechanism 330 in the pressing posture. Further, the upper end portion 420 of the return member 400 protrudes inward in the left-right direction and is formed on at least one of the left and right side walls 221 (the side wall 221 having the link mechanism 330) of the housing 220 of the cleaning unit 200. The rib 222 can be engaged from the front side.

  The pressing rib 222 is formed to be inclined forward as it goes upward. As a result, when the cleaning unit 200 is mounted from the upper side to the lower side of the drawer 50, the upper end portion 420 of the return member 400 is tilted forward by the pressing rib 222, and the return member 400 is swung clockwise in the figure. It comes to move.

  Therefore, as shown in FIG. 8, even when the link mechanism 330 is in the pressing posture when the cleaning unit 200 is mounted, the pressing arm 331 is tilted backward by the lower end portion 410 of the return member 400 that swings. As shown in FIG. 9, the link mechanism 330 automatically returns to the release posture. As a result, even if the link mechanism 330 is in a pressing posture in a state where the cleaning unit 200 is removed from the drawer 50, the link mechanism 330 is automatically brought into a release posture in accordance with the mounting operation of a new cleaning unit 200. Since it returns, it is possible to correct the link mechanism 330 and the cover member 210 to an appropriate positional relationship.

  In the above embodiment, the cleaning roller 71 is exemplified as the cleaning member. However, the present invention is not limited to this, and any cleaning bias may be applied, such as a conductive brush or a conductive leaf spring.

  In the above embodiment, the cleaning unit 70 can be attached to and detached from the drawer 50. However, the present invention is not limited to this, and the cleaning unit may be fixed to the drawer (cannot be attached or detached unless a tool or the like is used). In this case, the cover member may be provided not on the cleaning unit but on the drawer.

  In the above embodiment, the present invention is applied to the color printer 1. However, the present invention is not limited to this, and the present invention may be applied to other image forming apparatuses such as a copying machine and a multifunction machine.

DESCRIPTION OF SYMBOLS 1 Color printer 10 Apparatus main body 50 Drawer 51 Photosensitive drum 63 Endless belt 70 Cleaning unit 71 Cleaning roller 73 Cover member 100 Opening-closing mechanism 110 Main body side contact part 120 Cover side contact part

Claims (2)

The device body;
An endless belt provided in the apparatus body;
A plurality of photosensitive drums arranged to face the endless belt;
The plurality of photosensitive drums are rotatably provided, a contact position where the photosensitive drum contacts the endless belt, a separation position where the photosensitive drum is separated from the endless belt, and the photosensitive drum is pulled out of the apparatus main body. A drawer member movable to the drawn-out position,
A cleaning unit provided on the drawing member and having a cleaning member for collecting toner on the endless belt;
A cover member movable to a covering position that covers the cleaning member and an exposed position that is opened so as to expose the cleaning member toward the endless belt;
An opening / closing mechanism that moves the cover member to the covering position and the exposure position in conjunction with the movement of the drawing member;
The opening / closing mechanism includes a main body side contact portion provided in the apparatus main body, a biasing member that biases the cover member to the covering position, and a pressing posture corresponding to the exposure position provided in the drawing member. A link mechanism swingable between a release posture corresponding to the covering position, and the cover member is moved from the exposed position to the drawn position while the drawn member moves from the separated position to the drawn position. Configured to move to the covering position ,
The link mechanism contacts the body-side contact portion and swings from the release position to the pressing position when the pulling member moves from the pulling position to the separation position, thereby exposing the cover member. When the pulling member is moved to the pulling position from the separated position, it is brought into contact with the main body side abutting portion and swings from the pressing posture to the releasing posture to push the cover member. An image forming apparatus that releases pressure . The cleaning unit is detachably provided on the drawer member,
The pull-out member is provided with a return member that swings by contacting the cleaning unit when the cleaning unit is mounted, and returns the link mechanism from the pressing posture to the releasing posture. The image forming apparatus according to claim 1 .

Images