JP2019023737A - cartridge - Google Patents

Abstract

To realize a structure in which a drum cartridge is removable when the drum cartridge is being in the insertion position of a device main body 1a and the lock of a cover member 200 and a device main body 1a is retained until the drum cartridge is inserted to a certain degree.SOLUTION: The present invention includes a main body lock mechanism 600 that can lock or unlock a cover member 200 and a device main body 1a. The main lock mechanism 600 locks the device main device 1a and the cover member 200 when a drum cartridge is inserted from the insertion position of the device main body 1a by a first predetermined length. The main lock mechanism 600, on the other hand, unlocks the device main body 1a and the cover member 200 when the drum cartridge is inserted from the insertion position by a second predetermined length, which is longer than the first predetermined length.SELECTED DRAWING: Figure 12

Description

  The present invention relates to an image forming apparatus such as a copying machine, a printer, a facsimile machine, and a multi-function machine having a plurality of these functions, and more particularly to a configuration in which a unit such as a drum cartridge can be inserted into and removed from the apparatus main body.

  Conventionally, there is a configuration in which a unit such as a drum cartridge or a process cartridge can be inserted into and removed from the apparatus main body. As such a unit, there is a unit having a cover member for protecting an internal member such as a photosensitive drum. In addition, in this configuration having the cover member, when the unit is inserted into the apparatus main body, a configuration is proposed in which the cover member is detached from the unit by engaging a part of the cover member and the apparatus main body ( For example, Patent Document 1).

  Further, a configuration is proposed in which the cover member is locked to the apparatus main body when the unit is set at the insertion position of the apparatus main body, and the lock is released after the unit is inserted into a predetermined position of the apparatus main body (for example, a patent). Reference 2). Further, a configuration has been proposed in which the cover member is locked to the apparatus main body when the unit is set at the insertion position of the apparatus main body, and this lock can be released at any time (for example, Patent Document 3). In the case of the configurations described in Patent Documents 2 and 3, the unit is guided by a cover member locked to the apparatus main body. Further, in the case of the configuration described in Patent Document 3, the unit and the cover member are locked, and the lock between the unit and the cover member is released by performing the insertion operation of the unit while being attached to the apparatus main body. .

JP 2002-132120 A JP 2007-240661 A JP 2010-78703 A

  In the case of the configuration described in Patent Document 1, the cover member is not locked with respect to the apparatus main body when the unit is set at the insertion position of the apparatus main body, so that the unit including the cover member is inadvertently detached from the apparatus main body. There is a possibility.

  On the other hand, in the case of the configuration described in Patent Document 2, the cover member is locked with respect to the apparatus main body when the unit is set at the insertion position of the apparatus main body, but the lock is kept until the unit is mounted at a predetermined position of the apparatus main body. It will not be released. In this case, when the unit is attached by mistake, the cover member cannot be removed from the apparatus main body unless the unit is inserted to a predetermined position. Then, the unit inserted up to a predetermined position is removed without being covered by the cover member, and an image forming member such as a photosensitive drum disposed in the unit is exposed.

  Further, for example, a case where a configuration in which the lock between the unit and the cover member is released at the time of the unit insertion operation as described in Patent Document 3 will be considered. In this case, if the lock mechanism between the unit and the cover member fails and the lock cannot be released, the unit cannot be inserted to a predetermined position, and the lock between the cover member and the apparatus main body cannot be released.

  On the other hand, in the case of the configuration described in Patent Document 3, the lock between the cover member and the apparatus main body can be released at any time. However, it is desirable that the lock between the cover member and the apparatus main body not be removed until the unit is inserted into the apparatus main body to some extent. This is because if the cover member is detached from the apparatus main body during the insertion of the unit, the unit guided by the cover member may fall out of the apparatus main body. Further, if the cover member is detached from the apparatus main body during the insertion of the unit, an image forming member such as a photosensitive drum disposed in the unit may be exposed.

  In view of such circumstances, the present invention is configured such that the unit can be removed in a state where the unit is set at the insertion position of the apparatus main body, and the cover member and the apparatus main body cannot be unlocked until the unit is inserted to some extent. Invented to realize the above.

  The present invention includes an apparatus main body, a unit that can be inserted into and removed from the apparatus main body and includes an image forming member for forming an image, and a guide portion that guides the unit when the unit is inserted into the apparatus main body. When the first predetermined amount is inserted from the insertion position into the apparatus main body and the cover member that covers the image forming member, the apparatus main body and the cover member are locked, and the unit is inserted into the insertion position. The image forming apparatus includes: a main body locking unit that releases the lock between the apparatus main body and the cover member when a second predetermined amount larger than the first predetermined amount is inserted.

  According to the present invention, the unit can be removed in a state where the unit is set at the insertion position of the apparatus main body, and the cover member and the apparatus main body cannot be unlocked until the unit is inserted by the second predetermined amount.

1 is a schematic sectional view of an image forming apparatus according to a first embodiment. The side view which looked at the drum cartridge which concerns on 1st Embodiment from the right side of (a) perspective view, (b) sectional drawing, (c) (b). The (a) perspective view of the cover member which concerns on 1st Embodiment, (b) The perspective view seen from the insertion direction front end side. The perspective view which looked at the cover member which concerns on 1st Embodiment from the angle different from FIG.3 (b) from the (a) insertion direction front end side, (b) The side view which expands and shows a part. The drum cartridge which concerns on 1st Embodiment shows the state protected by the cover member, (a) Perspective view, (b) Sectional drawing. Sectional drawing which shows the locked state of the drum cartridge and cover member which concern on 1st Embodiment. FIG. 2A is a perspective view showing a state where a front cover is opened in a part of the apparatus main body according to the first embodiment, and FIG. 3B is a perspective view showing a state where a drum cartridge is taken out from the apparatus main body. FIG. 2A is a perspective view showing a state where a drum cartridge is installed on a rail in a part of the apparatus main body according to the first embodiment, and FIG. Sectional drawing which shows the locking mechanism of the drum cartridge and rail which concern on 1st Embodiment. FIG. 2A is a perspective view illustrating a state in which the drum cartridge is set at an insertion position via a cover member in a part of the apparatus main body according to the first embodiment, and FIG. 2B is a state in which the drum cartridge is inserted into the apparatus main body. FIG. The perspective view which shows the to-be-inserted part of a drum cartridge in a part of apparatus main body which concerns on 1st Embodiment. The drum cartridge according to the first embodiment is mounted on the apparatus main body, (a) in the first step, and (b) in the second step, the engaging portion of the moving member and the engaged portion of the apparatus main body, respectively. Sectional drawing which shows the relationship. (A) Sectional view showing the relationship between the engaging portion of the moving member and the engaged portion of the apparatus main body in the third step of mounting the drum cartridge according to the first embodiment on the apparatus main body, (b) movement The figure which shows the relationship between the protrusion part of a member, and the lock engaging part of an apparatus main body. (A) Sectional view showing the relationship between the engaging portion of the moving member and the engaged portion of the apparatus main body in the fourth step of mounting the drum cartridge according to the first embodiment on the apparatus main body, (b) movement The figure which shows the relationship between the protrusion part of a member, and the lock guide part of an apparatus main body. FIG. 5A is a cross-sectional view showing the relationship between the engaging portion of the moving member and the engaged portion of the apparatus main body in the fifth step of mounting the drum cartridge according to the first embodiment on the apparatus main body, and FIG. The figure which shows the relationship between the protrusion part of a member, and the lock release guide part of an apparatus main body. FIG. 2A is a perspective view showing a state where a drum cartridge is mounted on the apparatus main body, and FIG. 4B is a perspective view showing a state where a front cover is closed, in a part of the apparatus main body according to the first embodiment. (A) The perspective view shown in the state which opened the cover part of the cover member which concerns on 2nd Embodiment, (b) The perspective view shown in the state which closed the cover part. (A) The perspective view which expands and shows the hinge part of the cover member which concerns on 2nd Embodiment, (b) Sectional drawing shown in the state which closed the cover part. The cover member which concerns on 2nd Embodiment, (a) Top view, (b) AA sectional drawing of (a). (A) B part enlarged view of FIG.19 (b), (c) C part enlarged view. Sectional drawing which shows the state by which the drum cartridge which concerns on 2nd Embodiment is protected by the cover member. The left end enlarged view of FIG. (A) Perspective view showing a state before the drum cartridge is set in the apparatus main body, (b) The drum cartridge is set in the insertion position via the cover member in a part of the apparatus main body according to the second embodiment. The perspective view which shows a state. (A) A perspective view showing a state before removing the end cover member from the cover member according to the second embodiment, (b) a perspective view showing a state in the middle of removal, and (c) a state after removing. FIG. Sectional drawing which shows the state which set the drum cartridge provided with the cover member which concerns on 2nd Embodiment to the apparatus main body. The D section enlarged view of FIG. (A) A perspective view showing a state in which the cover part of the cover member set at the insertion position is opened in a part of the apparatus main body according to the second embodiment; (b) in the middle of inserting the drum cartridge into the apparatus main body. The perspective view which shows a state. The relationship between the elastically deformable portion and the cover member according to the second embodiment is as follows: (a) a perspective view showing a state where insertion of the drum cartridge into the apparatus main body is not started; (b) a perspective view showing a state during the insertion. FIG. 4C is a perspective view showing a state immediately before the insertion is completed. (A) The figure which shows a lock release state of the cover member and apparatus main body which concern on 2nd Embodiment, (b) The figure which shows a lock state. FIG. 7A is a perspective view showing a part of the apparatus main body according to the second embodiment, in which (a) a drum cartridge is mounted on the apparatus main body, and (b) a perspective view showing a state in which a cover member is removed from the apparatus main body.

<First Embodiment>
A first embodiment of the present invention will be described with reference to FIGS. First, a schematic configuration of the image forming apparatus of the present embodiment will be described with reference to FIG.

[Image forming apparatus]
The image forming apparatus 1 includes an image forming unit 10 for each color of Y (yellow), M (magenta), C (cyan), and K (black). The image forming apparatus 1 according to the present embodiment has a so-called tandem configuration in which the image forming units 10 of the respective colors are arranged in the rotational direction of the intermediate transfer belt 61. In the image forming unit 10 for each color, image formation is performed as follows. A photosensitive drum (photosensitive member) 11 serving as an image carrier is charged on its surface by a laser scanner 13 that is uniformly charged on the surface by a charging roller 12 and then driven based on a signal of transmitted image information. Is formed. Note that the image forming apparatus 1 of the present embodiment includes an image reading device 2, and the image information described above includes image information of a document read by the image reading device 2 and a personal computer connected to the image forming device 1. There is image information sent from an external terminal such as a computer.

  The latent image formed on the photosensitive drum 11 as described above is visualized as a toner image by the developing device 14, and a toner image corresponding to each color is formed on the photosensitive drum 11. That is, the developing device 14 includes a developing sleeve 14 a as a developer carrying member at a position facing the photosensitive drum 11. The developing sleeve 14a rotates while carrying the developer in the developing unit 14, and a predetermined developing bias is applied between the developing sleeve 14a and the photosensitive drum 11, thereby supplying toner to the photosensitive drum 11. The latent image is developed with toner.

  The toner images respectively formed on the photosensitive drums 11 of the respective colors are sequentially transferred to the intermediate transfer belt 61 by applying a predetermined pressing force and an electrostatic load bias by the primary transfer roller 17. After the transfer, a small amount of residual toner remaining on the photosensitive drum 11 is removed and collected by the cleaning blade 15 to prepare for the next image formation again. Since toner in the developing device 14 is consumed by such image formation, the toner is supplied from the toner cartridge 19 to the developing device 14.

  On the other hand, recording materials (sheets such as paper) P are fed one by one from the paper feed cassette 20 and conveyed to the registration roller pair 23. The recording material P has a leading edge that follows the nip portion of the registration roller pair 23 to form a loop, thereby correcting skew. Thereafter, the registration roller pair 23 conveys the recording material P between the intermediate transfer belt 61 and the secondary transfer outer roller 35 in synchronization with the toner image on the intermediate transfer belt 61. The toner image on the intermediate transfer belt 61 is applied to the recording material P by applying a predetermined pressurizing force and an electrostatic load bias at the nip portion between the driving roller 62 and the secondary transfer outer roller 35 disposed opposite to each other. Transcribed. After the transfer, a slight residual toner remaining on the intermediate transfer belt 61 is removed and collected by the cleaning unit 70, and is again prepared for the next image formation.

  The toner image transferred onto the recording material P is fixed on the recording material P by being heated and pressed at the nip portion between the heating roller 41 and the pressure roller 42 of the fixing device 40. The recording material P on which the toner image is fixed is discharged onto the paper discharge tray 51 by the paper discharge roller pair 50. In the image forming apparatus 1 of the present embodiment, a paper discharge tray 51 is provided between the image reading apparatus 2 and the apparatus main body 1a on which the above-described image forming unit 10, the intermediate transfer belt 61, the fixing device 40, and the like are arranged. It has a so-called in-body discharge configuration.

  In the case of the present embodiment, a recording material conveyance unit 3 that conveys the recording material P in the vertical direction is disposed on the right side of FIG. Further, a side cover 90 is provided on the right side surface of the image forming apparatus 1 in FIG. 1 so as to be rotatable about a rotation shaft 91, and is locked to a part of the apparatus main body 1 a by a locking portion 92. The side of the apparatus main body 1a is covered. The side cover 90 can release the side of the apparatus main body 1a by releasing the locking of the locking portion 92, and opens the side cover 90 when the recording material is jammed in the recording material transport unit 3. Thus, the inside of the apparatus main body 1a can be accessed.

[Drum cartridge]
In the case of this embodiment, the drum cartridge 100 (unit) having the photosensitive drum 11 which is also an image forming member for performing image formation is detachably attached to the apparatus main body 1a so that it can be replaced. As shown in FIGS. 2A and 2B, the drum cartridge 100 includes a photosensitive drum 11, a charging roller 12, and a cleaning blade 15, which are integrally supported by a housing 101. The photosensitive drum 11 and the charging roller 12 are supported so as to be rotatable with respect to the housing 101, and the charging roller 12 and the cleaning blade 15 are supported while being pressed against the photosensitive drum 11.

  Since the photosensitive drum 11, the charging roller 12, and the cleaning blade 15 are deteriorated when an image is formed, the drum cartridge 100 needs to be replaced according to the print amount. Accordingly, as will be described later, the drum cartridge 100 can be inserted / removed in the frontward direction of the apparatus main body 1a, and can be replaced when it reaches the end of its life. Note that the near side of the apparatus main body 1a is a side on which the user operates the image forming apparatus 1. Hereinafter, the “insertion direction” is the direction in which the drum cartridge 100 is inserted into the apparatus main body 1a, that is, the direction of the arrow α in FIGS. 2 (a) and 2 (c).

  By mounting the drum cartridge 100 on the apparatus main body 1a, the photosensitive drum 11 is drivingly connected to a drive transmission unit of a motor (not shown) on the apparatus main body 1a side via a coupling. Thereby, the photosensitive drum 11 is rotationally driven by the motor. Since the charging roller 12 is pressed by the photosensitive drum 11, it rotates following the photosensitive drum 11.

  As shown in FIGS. 2A to 2C, the housing 101 of the drum cartridge 100 is formed with a rib 102 and a guide 103 which are guided by a cover member 200 which will be described later when inserted into the apparatus main body 1a. As shown in FIGS. 2 (a) and 2 (b), the ribs 102 project laterally at portions near one end of the drum cartridge 100 in the insertion direction on one side surface of the housing 101 (left side surface in FIG. 2 (b)). It is formed as follows. As shown in FIGS. 2B and 2C, the guide 103 is a groove formed on the other side surface of the housing 101 (the right side surface in FIG. 2B) substantially parallel to the insertion direction.

  On the other side of the housing 101, a lock guide portion 104 formed in a groove shape adjacent to the guide 103 is formed along the insertion direction. The lock guide portion 104 is formed so as to be freely engageable with a protruding portion 211 (see FIG. 3B and the like) formed on a swing plate 210 provided on a cover member 200 to be described later. Like to do. As shown in FIG. 2C, the width of the vertical groove is wider than the lock guide portion 104 at the distal end in the insertion direction of the lock guide portion 104 (the right end of FIG. 2C). A lock engaging portion 105 is formed between which a step is formed. Further, a groove-like unlocking guide portion 106 that is inclined upward toward the rear side in the insertion direction from the lock guide portion 104 is formed at the rear end in the insertion direction of the lock guide portion 104 (left end in FIG. 2C). Has been. The lock engagement portion 105, the lock guide portion 104, and the lock release guide portion 106 are successively formed in this order. As will be described later, the lock engagement portion 105, the lock guide portion 104, and the lock release guide portion 106 are engaged with the protruding portion 211 to position the rotation phase of the swing plate 210 at predetermined positions.

[Cover member]
In this embodiment, before the drum cartridge 100 is attached to the apparatus main body 1a, the cover member 200 that covers at least the photosensitive drum 11 is attached to the drum cartridge 100 in order to protect the members such as the photosensitive drum 11. As shown in FIG. 3A, the cover member 200 is long in the insertion direction of the drum cartridge 100 (in the direction of arrow α in FIG. 3A) and is formed in a substantially box shape with the insertion direction leading end side and lower side open. ing. In the following description, the “insertion direction” is also used for the cover member 200 in the same manner as described above, but this is the direction when the cover member 200 is mounted on the drum cartridge 100.

  Such a cover member 200 includes a top plate portion 201, a first side plate portion 202, and a second side plate portion 203, as shown in FIGS. 3 (a), 3 (b), and 4 (a). The first side plate portion 202 and the second side plate portion 203 are respectively provided so as to protrude downward from both end portions in the width direction orthogonal to the insertion direction of the drum cartridge 100 of the top plate portion 201. In the present embodiment, as will be described later, the first side plate portion 202 is arranged in the vertical direction so as to appropriately cover the side of the photosensitive drum 11 that faces the developing device 14 of the drum cartridge 100 and is exposed in a wide range. Is made longer than the second side plate portion 203.

  As shown in FIG. 3B, the first side plate portion 202 has a groove-shaped drum guide 202a formed along the insertion direction on the inner surface thereof. As shown in FIG. 4A, the second side plate portion 203 is formed with protruding holding ribs 203a at both end portions of the inner side surface in the insertion direction.

  Further, an insertion portion 204 to be inserted at a predetermined position of the apparatus main body 1a is provided at the distal end portion of the cover member 200 in the insertion direction. On the rear side of the insertion portion 204 in the insertion direction, an abutting portion 205 that abuts a part of the apparatus main body 1a when inserted into the apparatus main body 1a is formed. Further, as shown in FIGS. 3B and 4A, the front end side of the cover member 200 in the insertion direction is opened so that the attached drum cartridge 100 can be inserted and removed. As shown in FIG. 3A, the rear end side of the cover member 200 in the insertion direction connects the rear end portion of the second side plate portion 203 and the first side plate portion 202 within the range of the length of the second side plate portion 203. As shown in FIG.

  Further, as shown in FIGS. 3A and 4B, a swing plate 210 as a moving member is disposed on the distal end side in the insertion direction of the second side plate portion 203. The swing plate 210 swings in the direction of arrow β in FIG. 4B with respect to the second side plate portion 203 of the cover member 200 about a swing shaft (not shown) orthogonal to the side surface of the second side plate portion 203. It is provided freely (movable). The swing plate 210 is formed so that the vertical width on the front end side in the insertion direction is small and the vertical width on the rear end side in the insertion direction is large.

  A protruding portion 211 that protrudes toward the inside of the cover member 200, that is, toward the drum cartridge 100 covered by the cover member 200, is provided at the tip of the swing plate 210. In the second side plate portion 203, a through hole 203 b is formed in the region corresponding to the distal end portion in the insertion direction of the swing plate 210 along the swing direction of the swing plate 210. As shown in FIGS. 3B and 4A, a protruding portion 211 formed at the tip of the swing plate 210 protrudes into the cover member 200 through the through hole 203b. Thereby, the swinging plate 210 can swing within a range in which the protruding portion 211 can move in the through hole 203b. Further, an engaging portion 212 that protrudes on the opposite side of the second side plate portion 203 is provided at the upper end portion near the rear end of the swing plate 210.

[Mounting the drum cartridge to the cover member]
As shown in FIGS. 5 and 6, the drum cartridge 100 is mounted on the cover member 200 configured as described above. Specifically, the drum cartridge 100 is inserted from the opening on the front end side of the cover member 200. At this time, as shown in FIG. 5B, the rib 102 formed on one side surface of the housing 101 of the drum cartridge 100 has a drum guide 202 a formed on the inner side surface of the first side plate portion 202 of the cover member 200. Engage. The holding rib 203 a formed on the inner side surface of the second side plate portion 203 engages with the guide 103 formed on the other side surface of the housing 101.

  The drum cartridge 100 is guided into the cover member 200 along the insertion direction by engaging the guides and the ribs as guide portions. With the drum cartridge 100 mounted on the cover member 200 in this way, the space in which the photosensitive drum 11 and the like are disposed is covered with the top plate portion 201, the first side plate portion 202, and the second side plate portion 203. The photosensitive drum 11 and the like are not exposed to the outside.

  The drum cartridge 100 and the cover member 200 are locked so as not to be separated in the mounted state. Therefore, as shown in FIG. 6, the protrusion 211 of the swing plate 210 provided on the cover member 200 is formed on the front end side in the insertion direction on the other side of the housing 101 of the drum cartridge 100 in the mounted state. The lock engaging portion 105 is engaged. Thereby, it is possible to prevent the drum cartridge 100 from being pulled out from the opening on the distal end side in the insertion direction of the cover member 200. That is, the drum cartridge 100 cannot be moved relative to the cover member 200 in the direction of the arrow α in FIG. Since the rear end side of the cover member 200 in the insertion direction is covered with the rear plate 206, the drum cartridge 100 is not pulled out from the rear end side in the insertion direction.

[Drum cartridge replacement]
Next, replacement of the drum cartridge 100 of this embodiment will be described. First, the operation of extracting the drum cartridge 100 attached to the apparatus main body 1a will be described with reference to FIGS.

[Drum cartridge removal]
FIG. 7 is a schematic diagram that simply shows the configuration of a portion of the image forming apparatus 1 according to the present embodiment where the drum cartridges 100 of the respective colors are mounted. The apparatus main body 1a is provided with a front cover 400 that can be freely opened and closed on the front side, and as shown in FIG. 7A, the drum cartridge 100 of each color can be accessed by opening the front cover 400. In the apparatus main body 1a, a plurality of drum cartridges 100 can be arranged in the order of yellow, magenta, cyan, and black from the left in FIG. In the present embodiment, the plurality of drum cartridges 100 have a common configuration. The cover members 200 that cover the drum cartridges 100 of the respective colors are also common to each other. In FIG. 7A, each color developing device 14 is arranged adjacent to each color drum cartridge 100.

  In the following description, replacement of the cyan (third from the left in FIG. 7A) drum cartridge 100 will be described, but the same applies to drum cartridges of other colors. It is assumed that the cyan drum cartridge 100 replacement sign is notified to a display unit (for example, an operation panel) (not shown) of the image forming apparatus 1 or a connected external terminal. In this case, an operator such as a user or a service person opens the front cover 400 as shown in FIG. Next, as shown in FIG. 7B, the corresponding drum cartridge 100 is extracted from the apparatus main body 1a.

  Here, as shown in FIGS. 8 and 9, the drum cartridge 100 is locked so as not to come out of a predetermined mounting position of the apparatus main body 1a. That is, as shown in FIG. 8A, the drum cartridge 100 is provided in the apparatus main body 1 a and is placed on a guide rail 410 that guides the drum cartridge 100. As shown in FIG. 8B, the guide rail 410 is provided with a lock claw 411 that is movable in part in the vertical direction by elastic deformation and whose tip protrudes upward. When the drum cartridge 100 is mounted at a predetermined mounting position of the apparatus main body 1a, the lock claw 411 engages with an engagement hole 16a provided at a predetermined position on the lower surface of the drum cartridge 100 as shown in FIG. Thus, it is locked at the mounting position.

  Moreover, as shown in FIG. 9, the lock release member 16b is arrange | positioned in the engagement hole 16a. The lock release member 16b is movable along an engagement hole 16a formed in the vertical direction, and has an operation lever 16c exposed to the front surface of the drum cartridge 100 and operable by an operator. When the operator depresses the operation lever 16c in the direction of the arrow γ in FIG. 9, the lock release member 16b is also lowered, the lock claw 411 is pushed down, and the engagement between the lock claw 411 and the engagement hole 16a is released. Thereby, the lock of the drum cartridge 100 is released, and the drum cartridge 100 can be extracted from the apparatus main body 1a in the direction of the arrow δ in FIG.

  Since the drum cartridge 100 has been used after the drum cartridge 100 has been pulled out, the protection after pulling out may be rough compared to when the drum cartridge 100 is inserted. The drum cartridge 100 after being pulled out is collected by a service person or the like. Note that when the drum cartridge 100 is pulled out, the cover member 200 may be attached to an insertion position, which will be described later, of the apparatus main body 1a to guide the drum cartridge 100 into the cover member 200. Thereby, for example, even if the toner adheres to the photosensitive drum 11 or the like, it is possible to prevent the operator from getting dirty.

[Installing the drum cartridge]
Next, the operation of mounting the drum cartridge 100 to the apparatus main body 1a will be described with reference to FIGS. First, as shown in FIG. 10A, the operator inserts a new drum cartridge 100 covered by the cover member 200 into the insertion position of the apparatus main body 1a. Then, as shown in FIG. 10B, the drum cartridge 100 is inserted into the apparatus main body 1a by being moved relative to the cover member 200 in the insertion direction.

  Here, as shown in FIG. 11, the insertion portion 300 into which the drum cartridge 100 of the apparatus main body 1a is inserted has a support portion that can be engaged with the insertion portion 204 provided at the distal end portion in the insertion direction of the cover member 200. 301 is formed. The support portion 301 supports the cover member 200 and the drum cartridge 100 on the apparatus main body 1a in a state where the drum cartridge 100 covered by the cover member 200 is inserted by a predetermined amount toward the insertion position of the apparatus main body 1a.

  Specifically, the support portion 301 is formed so as to be recessed above the insertion portion 300 and to have a predetermined length in the insertion direction, and the support surface 302 is formed on the upper surface, and both ends of the support surface 302 in the width direction. The guide rib 304 is formed in the side wall 303 along the insertion direction. In addition, a protrusion 305 formed so as to protrude downward is provided on an end of the guide rib 304 on one side (the right side in FIG. 11) on the receiving side of the drum cartridge 100 (the left end in FIG. 12A).

  On the other hand, the insertion portion 204 of the cover member 200 has a contact surface 204a and an engagement rib 204b as shown in FIGS. 3 and 12A. The contact surface 204a contacts the support surface 302 in a state where the cover member 200 is inserted into the apparatus main body 1a. The engaging ribs 204b are respectively placed on the guide ribs 304 on both sides in the width direction of the contact surface 204a and can engage with the guide ribs 304.

  When the drum cartridge 100 covered by the cover member 200 is inserted toward the insertion position of the apparatus main body 1a, the insertion part 204 of the cover member 200 is inserted into the support part 301 of the apparatus main body 1a. In this state, the contact surface 204a contacts the support surface 302, and the engagement rib 204b is supported by the guide rib 304, whereby the cover member 200 is guided toward the insertion position.

[First step]
Then, as shown in FIG. 12A, the engaging portion 212 of the swing plate 210 provided on the cover member 200 is formed on the guide rib 304 on one side in a state where the cover member 200 is inserted by a predetermined amount Y. It comes into contact with the front surface of the protruding portion 305. The front surface of the protrusion 305 is a surface on the side where the cover member 200 and the drum cartridge 100 are inserted, and is a front surface of the apparatus main body 1a. The rear surface of the protrusion 305 described later is the back side of the front surface and the back surface of the apparatus main body 1a.

  Here, the interval X between the support surface 302 and the upper surface of the guide rib 304 is formed to be slightly larger than the interval between the contact surface 204a of the insertion portion 204 and the lower surface of the engagement rib 204b. And the support part 301 are small. Therefore, the drum cartridge 100 covered by the cover member 200 is supported with respect to the apparatus main body 1a in a state where the insertion portion 204 is inserted into the support portion 301 by a predetermined amount Y. That is, even if the operator releases his / her hands from the cover member 200 and the drum cartridge 100, they will not fall out of the apparatus main body 1a.

[Second step]
Next, when the cover member 200 and the drum cartridge 100 are further inserted from the state shown in FIG. 12A, the swing plate 210 provided on the cover member 200 is engaged with the engaging portion 212 as shown in FIG. And begins to rotate in the β1 direction by engagement with the protrusion 305. 12A and 12B, the protrusion 211 of the swing plate 210 remains engaged with the lock engaging portion 105 of the drum cartridge 100, as shown in FIG. The cartridge 100 is locked to the cover member 200.

[Third step]
Next, when the cover member 200 and the drum cartridge 100 are further inserted, as shown in FIG. 13A, the swinging plate 210 further rotates in the arrow β1 direction, and the engaging portion 212 passes below the protruding portion 305. To do. At this time, the contact portion 205 of the cover member 200 contacts the contacted surface 306 which is a part of the apparatus main body 1a, and the cover member 200 is not inserted any more. In this state, the cover member 200 and the drum cartridge 100 are located at the insertion position of the apparatus main body 1a. Further, as shown in FIG. 13B, the protrusion 211 and the lock engagement portion 105 are disengaged, and the lock between the cover member 200 and the drum cartridge 100 is released. Then, the drum cartridge 100 can move in the insertion direction with respect to the cover member 200.

  That is, in the case of the present embodiment, when the drum cartridge 100 covered by the cover member 200 is arranged at the insertion position (position shown in FIG. 13A), the lock between the drum cartridge 100 and the cover member 200 is released. Thus, in the case of the present embodiment, the unit lock mechanism 500 is provided as a unit lock unit that locks and unlocks the drum cartridge 100 and the cover member 200. The unit lock mechanism 500 includes an engagement portion 212, a protrusion 305 as an engaged portion, a swing plate 210 as a moving member, a protrusion 211, and a lock engagement portion 105.

  As described above, the engaging portion 212 is provided on the cover member 200. The protruding portion 305 as the engaged portion is provided on the apparatus main body 1a and is freely engageable with the engaging portion 212. An oscillating plate 210 as a moving member is provided with an engaging portion 212 and is arranged to be movable (swingable) with respect to the cover member 200. The protrusion 211 protrudes toward the drum cartridge 100 provided on the swing plate 210 and covered by the cover member 200. The lock engaging portion 105 is freely engageable with the protruding portion 211, and locks the drum cartridge 100 and the cover member 200 while being engaged with the protruding portion 211. On the other hand, when the drum cartridge 100 covered by the cover member 200 is disposed at the insertion position, the lock engagement portion 105 is moved by the engagement portion 212 engaging with the protrusion 305 and the swing plate 210 being moved. The engagement with the portion 211 is released.

  As shown in FIG. 13B, a release portion 105 a that is recessed upward from the lock guide portion 104 is formed above the lock engagement portion 105. For this reason, the protruding portion 211 can move above the position of the lock guide portion 104, and the swing plate 210 can also swing in the direction of the arrow β1. As a result, the position of the engaging portion 212 can be further lowered with respect to the protrusion 305, and the engagement can be released more reliably.

  As described above, the drum cartridge 100 that is unlocked from the cover member 200 by releasing the engagement between the protruding portion 211 and the lock engaging portion 105 is guided to the cover member 200, and the apparatus main body. It can be inserted into 1a. That is, as shown in FIG. 5B, the rib 102 of the drum cartridge 100 is engaged with the drum guide 202 a of the cover member 200, and the holding rib 203 a of the cover member 200 is engaged with the guide 103 of the drum cartridge 100. Match. Therefore, these engagements allow the drum cartridge 100 to be inserted into the apparatus main body 1a while being guided by the cover member 200.

[Fourth step]
When only the drum cartridge 100 is inserted from this insertion position toward the mounting position of the apparatus main body 1a, the swing plate 210 is opposite to the direction of the arrow β1 as shown in FIG. It rotates in the direction of the arrow β2. At this time, the contact portion 205 of the cover member 200 contacts the contacted surface 306 which is a part of the apparatus main body 1a, and the cover member 200 is not inserted any more. Thus, the engaging portion 212 that has passed through the protrusion 305 is disposed at a position where it can engage with the rear surface of the protrusion 305.

  That is, when the first predetermined amount of drum cartridge 100 is inserted from the insertion position, the protruding portion 211 of the swing plate 210 moves relative to the drum cartridge 100 as shown in FIG. Engage with the lock guide 104. At this time, the protruding portion 211 positioned above the lock guide portion 104 by the release portion 105a is guided by an inclined portion 105b formed between the release portion 105a and the upper surface of the lock guide portion 104, thereby locking. Engages with the guide portion 104. As a result, as shown in FIG. 14A, the swinging plate 210 swings in the direction of the arrow β2, and the engaging portion 212 moves to a position where it can engage with the protruding portion 305. And the cover member 200 is locked with respect to the apparatus main body 1a, and the cover member 200 cannot be removed from the apparatus main body 1a.

  Thus, in the case of this embodiment, it has the main body locking mechanism 600 as a main body locking means for locking and unlocking the apparatus main body 1a and the cover member 200. The main body lock mechanism 600 includes an engaging portion 212 and a protrusion 305 as an engaged portion. Then, the main body lock mechanism 600 engages the engaging portion 212 and the protruding portion 305 when the drum cartridge 100 is inserted from the insertion position by a first predetermined amount. On the other hand, as will be described later, the main body locking mechanism 600 releases the engagement between the engaging portion 212 and the protruding portion 305 when the drum cartridge 100 is inserted into the second predetermined amount from the insertion position.

  More specifically, the main body lock mechanism 600 also includes a swing plate 210 as a moving member, a protruding portion 211, a lock guide portion 104, and a lock release guide portion 106. The lock guide portion 104 is within a range in which the drum cartridge 100 moves relative to the cover member 200 to a position that does not include a position that becomes the second predetermined amount between the first predetermined amount and the second predetermined amount. It is formed substantially parallel to the insertion direction. The lock guide portion 104 has a protruding portion so that the rocking plate 210 is held at an engaging position where the engaging portion 212 and the protruding portion 305 engage when the drum cartridge 100 moves in this range. 211 is engaged and guided. On the other hand, the lock release guide portion 106 swings to an engagement release position where the engagement between the engagement portion 212 and the protrusion 305 is released when the drum cartridge 100 is moved to a position where the second predetermined amount is reached. The protrusion 211 is engaged and guided so as to move the plate 210. This point will be described later.

  As described above, in the present embodiment, the main body lock mechanism 600 includes the above-described unit lock mechanism 500, the engaging portion 212, the protruding portion 305 as the engaged portion, the swing plate 210 as the moving member, and the protruding portion 211. The configuration is common. Further, the lock guide portion 104 and the lock release guide portion 106 are grooves formed continuously with the lock engagement portion 105. For this reason, the main body lock mechanism 600 and the unit lock mechanism 500 have a common configuration as a mechanism.

  Here, even if the cover member 200 is pulled out from the apparatus main body 1a in a state where the cover member 200 is locked to the apparatus main body 1a, the cover member 200 cannot be pulled out from the apparatus main body 1a. That is, in this state, as shown in FIG. 14B, the swinging of the swinging plate 210 is restricted by the engagement of the protruding portion 211 and the lock guide portion 104, so the engaging portion 212 and the protruding portion The state of engagement with the rear surface of 305 is maintained. For this reason, the cover member 200 cannot be pulled out from the apparatus main body 1a.

  On the other hand, when the drum cartridge 100 that has been inserted from the insertion position by a first predetermined amount or more is returned to the insertion position, the lock between the apparatus main body 1a and the cover member 200 is released. That is, when the drum cartridge 100 is returned to the insertion position, the protruding portion 211 moves to the region of the lock engagement portion 105 at the distal end side in the insertion direction with respect to the lock guide portion 104 as shown in FIG. As a result, the swing plate 210 can swing in the direction of the arrow β1, and as shown in FIG. 13A, the engagement between the engagement portion 212 and the protrusion 305 is released, and the apparatus main body 1a and the cover member are disengaged. The lock with 200 is released. Therefore, if the drum cartridge 100 is returned to the insertion position, the cover member 200 and the drum cartridge 100 can be detached from the apparatus main body 1a.

  The first predetermined amount described above may be a distance that allows the drum cartridge 100 to move in the insertion direction with respect to the cover member 200 from the insertion position shown in FIG. In other words, the cover member 200 and the apparatus main body 1a may be locked by pushing only the drum cartridge 100 from the state where the operator sets the drum cartridge 100 and the cover member 200 at the insertion position. In other words, the cover member 200 and the apparatus main body 1a are locked when only the drum cartridge 100 moves in the insertion direction due to momentum when the operator sets the drum cartridge 100 and the cover member 200 at the insertion position. To the extent that it is not. For this reason, the first predetermined amount is set to be larger than, for example, rattling in the insertion direction of the locked drum cartridge 100 and the cover member 200.

[Fifth step]
When only the drum cartridge 100 is further inserted from this state toward the mounting position of the apparatus main body 1a, the swinging plate 210 rotates in the direction of arrow β1, as shown in FIG. And the engaging part 212 of the rocking | swiveling plate 210 is located under the protrusion part 305 (engagement release position), and these engagements are cancelled | released. As a result, the lock between the apparatus main body 1a and the cover member 200 is released, and the cover member 200 can be detached from the apparatus main body 1a.

  That is, when the drum cartridge 100 is inserted from the insertion position by a second predetermined amount that is larger than the first predetermined amount, the protruding portion 211 of the swing plate 210 moves relative to the drum cartridge 100 as shown in FIG. Move relative. Then, the protruding portion 211 engages with the lock release guide portion 106. As described above, since the unlocking guide part 106 is inclined upwardly toward the rear side in the insertion direction with respect to the locking guide part 104, the protruding part 211 is guided while being engaged with the unlocking guide part 106. As a result, the swing plate 210 rotates in the direction of the arrow β1. As a result, as shown in FIG. 15A, the swing plate 210 swings in the direction of the arrow β1, and the engaging portion 212 moves to a position where it does not engage with the protruding portion 305.

  Further, the guide 103 and the lock release guide portion 106 formed on the other side surface (the right side surface in FIG. 2B) of the housing 101 of the drum cartridge 100 are open to the rear end in the insertion direction on the other side surface. Here, as shown in FIG. 2A, both side surfaces of the housing 101 are continuous with the rear end surface in the insertion direction and the inclined surface 101a, respectively. The pair of inclined surfaces 101a are inclined in a direction in which the distance between them becomes narrower toward the rear end side in the insertion direction. Therefore, as shown in FIG. 2 (a), the guide 103 and the unlocking guide portion 106 have penetrated to the inclined surface 101a by the depth.

  As a result, the holding rib 203a and the protrusion 211 that engage with the guide 103 and the unlock guide part 106, respectively, can come out from the guide 103 and the unlock guide part 106 in the insertion direction. As shown in FIG. 4A, the drum guide 202a formed on the cover member 200 is also opened to the front side in the insertion direction of the cover member 200. Therefore, the rib 102 of the drum cartridge 100 engaged therewith can be pulled out from the drum guide 202a to the front side in the insertion direction. As described above, the cover member 200 can be removed from the drum cartridge 100 when the cover member 200 is removed from the apparatus main body 1a. That is, the cover member 200 can be detached from the apparatus main body 1a and the drum cartridge 100 when the drum cartridge 100 is inserted into the second predetermined amount.

  The second predetermined amount is preferably set until the drum cartridge 100 is inserted to a predetermined mounting position of the apparatus main body 1a. In the insertion position, as shown in FIGS. 8 and 9, the lock claw 411 of the apparatus main body 1a is engaged with the engagement hole 16a of the drum cartridge 100, and the drum cartridge 100 is locked with respect to the apparatus main body 1a. Is done. For this reason, when the cover member 200 is removed from the apparatus main body 1a, the drum cartridge 100 can be prevented from being pulled out carelessly.

  However, the second predetermined amount may be a position where the center of gravity of the drum cartridge 100 enters the apparatus main body 1a. That is, if the center of gravity of the drum cartridge 100 is on the guide rail 410 of the apparatus main body 1a, the drum cartridge 100 can be prevented from being accidentally dropped from the apparatus main body 1a even if the cover member 200 is removed. Further, in the case of the drum cartridge 100 having the photosensitive drum 11 inside as in the present embodiment, the second predetermined amount may be a position where the photosensitive drum 11 is accommodated in the apparatus main body. That is, if the photosensitive drum 11 is within the apparatus main body 1a, the photosensitive drum 11 is hardly exposed to the outside even if the cover member 200 is removed, and the photosensitive drum 11 is damaged or difficult to be exposed at the time of insertion.

  In any case, the cover member 200 is removed from the apparatus main body 1a and the drum cartridge 100 after the drum cartridge 100 is inserted by the second predetermined amount from the insertion position. In the present embodiment, the cover member 200 is removed after the drum cartridge 100 is inserted to a predetermined mounting position. As a result, the drum cartridge 100 is mounted at a predetermined mounting position as shown in FIG. 16A, and then the front cover 400 is closed as shown in FIG. The work is complete.

  As described above, in this embodiment, the drum cartridge 100 is positioned at the insertion position of the apparatus main body 1a while being protected by the cover member 200, and then the drum cartridge 100 is inserted into the apparatus main body 1a. Therefore, the insertion operation of the apparatus main body 1a can be performed without damaging each member such as the photosensitive drum 11 in the drum cartridge 100. In addition, since the cover member 200 and the drum cartridge 100 are locked by the unit lock mechanism 500 in the state before mounting, it is possible to prevent the cover member 200 from being accidentally removed from the drum cartridge 100 before mounting.

  In the case of this embodiment, the drum cartridge 100 can be removed in a state where the drum cartridge 100 is set at the insertion position of the apparatus main body 1a. That is, as shown in FIG. 13A described above, at the insertion position, the engaging portion 212 provided on the swing plate 210 of the cover member 200 and the protrusion 305 provided on the apparatus main body 1a are engaged. Not done. For this reason, in the state which set the drum cartridge 100 and the cover member 200 in the insertion position, these can be easily removed from the apparatus main body 1a. For this reason, even if the drum cartridge 100 is mistakenly set at the insertion position of the apparatus main body 1a, the drum cartridge 100 can be removed without being accompanied by the insertion operation as described in Patent Document 2 described above.

  In the case of this embodiment, when the drum cartridge 100 is inserted from the insertion position by a first predetermined amount, the apparatus main body 1a and the cover member 200 are locked. Further, the lock between the cover member 200 and the apparatus main body 1a cannot be released until the drum cartridge 100 is inserted by the second predetermined amount. Therefore, the cover member 200 is not inadvertently detached from the apparatus main body 1a when the drum cartridge 100 is inserted, and the drum cartridge 100 can be mounted up to a predetermined mounting position while being guided by the cover member 200.

  For example, if the cover member 200 and the apparatus main body 1a can be unlocked at any time as described in Patent Document 3, the operator mistakenly attaches the cover member 200 to the apparatus main body 1a during the insertion operation of the drum cartridge 100. May be removed. Thus, when the cover member 200 is removed from the apparatus main body 1a during the insertion operation of the drum cartridge 100, the drum cartridge 100 is not guided by the cover member 200, and therefore the insertion operation cannot be performed smoothly. In the present embodiment, since at least the second predetermined amount is the position where the center of gravity of the drum cartridge 100 is located in the apparatus main body 1a, the drum cartridge 100 even if the cover member 200 and the apparatus main body 1a are unlocked in this state. Can be prevented from falling off. After that, the drum cartridge 100 is guided by the guide rail 410 of the apparatus main body 1a, and the insertion operation can be performed smoothly.

  In the present embodiment, the cover member 200 and the drum cartridge 100 are unlocked by disposing the cover member 200 and the drum cartridge 100 at the insertion position. Therefore, the lock between the cover member 200 and the drum cartridge 100 can be released without performing another operation.

  Further, when a failure occurs in the unit lock mechanism 500 that locks and unlocks the cover member 200 and the drum cartridge 100 and this mechanism does not operate, the cover member 200 and the drum cartridge 100 cannot be disposed at the insertion position. . For example, when the swing plate 210 is stuck and does not rotate, the swing plate 210 rotates even if the engaging portion 212 and the projection 305 are engaged when the cover member 200 is set at the insertion position. Without the cover member 200 being inserted into the insertion position. Even if the cover member 200 can be disposed at the insertion position, the drum cartridge 100 cannot be inserted into the first predetermined amount unless the cover member 200 and the drum cartridge 100 are unlocked. For this reason, the cover member 200 and the apparatus main body 1a are not locked. In any case, when a failure occurs in the unit lock mechanism 500, the cover member 200 can be prevented from being inadvertently locked to the apparatus main body 1a, and can be removed from the apparatus main body 1a.

  In the present embodiment, the main body lock mechanism 600 and the unit lock mechanism 500 have a common configuration as a mechanism. For this reason, the number of parts can be reduced as compared with the case where these mechanisms are configured differently. In addition, as described above, the main body lock mechanism 600 and the unit lock mechanism 500 perform locking and unlocking in conjunction with the setting of the cover member 200 and the drum cartridge 100 to the insertion position and the insertion operation of the drum cartridge 100, respectively. Do. That is, in the present embodiment, the lock mechanism is locked and unlocked only by setting and inserting the drum cartridge 100 into the apparatus main body 1a. For this reason, the mounting operation of the apparatus main body 1a of the drum cartridge 100 can be easily performed without performing an operation only for locking and unlocking each locking mechanism.

  In the above description, the main body lock mechanism 600 and the unit lock mechanism 500 have a common configuration, but these may be different configurations. In addition, each lock mechanism is locked and unlocked by swinging the swing plate 210, but another configuration, for example, a moving member that slides instead of the swing plate may be used. good. That is, the moving member may slide up and down along the lock engaging portion 105, the lock guide portion 104, and the lock release guide portion 106.

<Second Embodiment>
A second embodiment of the present invention will be described with reference to FIGS. In the case of the present embodiment, the cover member 700 that covers the drum cartridge 100 and the configuration of locking and unlocking the apparatus main body 1b are different from those of the first embodiment. For this reason, the description and illustration overlapping with the first embodiment will be omitted or simplified below, and the description will focus on parts that are different from the first embodiment.

[Cover member]
As shown in FIGS. 17A and 17B, the cover member 700 includes a lid portion 710 at the upper portion and a housing portion 720 at the lower portion, and the lid portion 710 is provided to be openable and closable with respect to the housing portion 720. ing. A delivery port 740 for delivering the drum cartridge 100 from the cover member 700 to the apparatus main body 1b is provided at the distal end side in the insertion direction of the cover member 700. The outer periphery of the delivery port 740 serves as a fitting portion 750 into which the cover member 700 is fitted into an opening portion 800 (inserted portion, FIG. 23A) that is a receiving port of the drum cartridge 100 of the apparatus main body 1b. Further, an engaging portion 760 that engages with the protruding portion 810 (FIG. 29A) of the apparatus main body 1 b is provided on the upper portion of the fitting portion 750.

  In the present embodiment, the cover portion 710 and the housing portion 720 of the cover member 700 are formed of an integral resin, and the material is made of a resin such as black polypropylene, for example. As shown in FIG. 18A, the lid 710 can be opened and closed with respect to the accommodating portion 720 by a living hinge 730. Further, as shown in FIG. 18B, a light is not directly applied to the inside of the cover member 700 by providing a 711 in the vicinity of the gap when the lid 710 is closed with respect to the housing 720. I have to.

  As shown in FIGS. 19A and 19B, the lid portion 710 is provided with a snap fit 712 and a hook 713, and when the lid portion 710 is closed, the lid portion 710 is engaged with the accommodating portion 720, respectively. . As a result, the lid portion 710 is locked to the accommodating portion 720. As shown in FIG. 20A, the hook 713 can enter the inside through an opening 721 formed in the housing portion 720 while being elastically deformed. Then, the hook 713 is engaged with the periphery of the opening 721, so that the lid 710 is locked in the closed state in the housing 720. The hook 713 cannot be removed unless the lid portion 710 moves relative to the housing portion 720 to the back side (arrow R direction, insertion direction front side, right side in FIG. 19B).

  Further, as shown in FIG. 20B, the snap fit 712 can enter the inside through an opening 722 formed in the housing portion 720 while being elastically deformed. Then, the snap fit 712 engages with the periphery of the opening 722, so that the lid 710 is locked in the closed state in the housing portion 720. When snap fit 712 receives a force on the front side (arrow F direction, insertion direction rear side, left side in FIG. 19B) with respect to housing portion 720, it bends and disengages from the periphery of opening 722. It is possible.

  In the present embodiment, when the lid portion 710 is closed, the snap fit 712 and the hook 713 are all hooked on a part of the accommodating portion 220, and the lid portion 710 is not easily opened. On the other hand, in the state where the snap fit 712 is deflected by applying a force in the direction of arrow F and is detached from the accommodating portion 220, when the lid portion 710 is opened, the lid portion 710 is inclined because only the back side is opened. In this state, the hook 713 also moves in the direction of the arrow R, and the lid 710 can be opened in the raised state.

[Mounting the drum cartridge to the cover member]
As shown in FIGS. 21 and 22, the drum cartridge 100 is mounted on the cover member 700 configured as described above. Specifically, the drum cartridge 100 is disposed in the housing portion 720 with the lid portion 710 opened, and the lid portion 710 is shown. As a result, the drum cartridge 100 is housed in the cover member 700, and the drum cartridge 100 is covered by the cover member 700. Further, in this state, the end cover member 770 is fitted into a fitting portion 750 provided on the distal end side (right side in FIG. 21) of the cover member 700 in the insertion direction.

  The end cover member 770 is formed of, for example, a foam material, and is coupled to the engagement portion 760 of the cover member 700 by the elasticity of the foam material. As a result, the delivery port 740 is covered with the end cover member 770, and the entire drum cartridge 100 is covered with the cover member 700 and the end cover member 770. Further, as shown in FIG. 22, a stopper portion 714 is provided on the rear end side in the insertion direction of the lid portion 710. Then, with the lid portion 710 closed, the stopper portion 714 is brought into contact with the end surface on the distal end side in the insertion direction of the protruding portion 110 protruding upward at the rear end portion in the insertion direction of the drum cartridge 100. Thereby, it is possible to prevent the drum cartridge 100 from moving toward the distal end side in the insertion direction within the cover member 700. Therefore, even if the end cover member 770 is not present, the drum cartridge 100 does not jump out of the delivery port 740 of the cover member 700.

  As shown in FIG. 28A described later, a part of the drum cartridge 100 comes into contact with the engaging portion 760 and elastically pushes the engaging portion 760 apart. In this state, the drum cartridge 100 is housed protected by the cover member 700 and the end cover member 770. As a physical distribution packing form of the drum cartridge 100, the cover member 700 may be packed together with a cushioning member such as a foaming material, a protective bag, a cardboard box, and the like as in the conventional case.

[Drum cartridge replacement]
Next, replacement of the drum cartridge 100 of this embodiment will be described. In the present embodiment, as in the first embodiment, the replacement of the cyan (third from the left in FIG. 23A) drum cartridge 100 will be described, but the same applies to drum cartridges of other colors. As in the first embodiment, the drum cartridge 100 to be replaced is extracted from the apparatus main body 1b (FIG. 23A). Then, as shown in FIG. 23B, the new drum cartridge 100 covered by the cover member 700 is inserted into the insertion position of the apparatus main body 1b.

  At this time, as shown in FIGS. 24A to 24C, the end cover member 770 is removed from the cover member 700. Here, as described with reference to FIG. 22, the stopper portion 714 of the cover member 700 is in contact with the protruding portion 110 of the drum cartridge 100. For this reason, even if the end cover member 770 is removed, the drum cartridge 100 does not fall off the cover member 700 until the end cover member 770 is positioned on the apparatus main body 1a.

  Then, the drum cartridge 100 covered by the cover member 700 is inserted into the insertion position of the apparatus main body 1b. At this time, as shown in FIG. 25, the fitting portion 750 of the cover member 700 is fitted into the opening 800 of the apparatus main body 1b. Since the end cover member 770 is larger than the opening 800, the cover member 700 cannot be inserted into the opening 800 with the end cover member 770 attached.

  Further, the opening 800 serving as a support portion allows the cover member 700 and the drum cartridge 100 to be inserted into the apparatus main body 1b in a state where a predetermined amount of the drum cartridge 100 covered by the cover member 700 is inserted toward the insertion position of the apparatus main body 1b. To support. That is, as shown in FIG. 25, the fitting portion 750 of the cover member 700 is fitted to the opening 800 of the apparatus main body 1b without rattling, and the fitting width Y is set to 50 mm, for example. Thereby, the drum cartridge 100 covered with the cover member 700 is supported with respect to the apparatus main body 1b. That is, even if the operator releases his / her hands from the cover member 700 and the drum cartridge 100, they will not fall out of the apparatus main body 1b. In the present embodiment, this position is the insertion position of the drum cartridge 100 with respect to the apparatus main body 1b.

  Further, as shown in FIG. 26, a protrusion 801 is formed on a part of the front side (left side in FIG. 26) of the apparatus main body 1b on the upper side of the opening 800 so as to protrude to the front side. Yes. On the other hand, an opening 723 is formed in a part of the housing portion 720 of the cover member 700 at a portion facing the snap fit 712 of the lid portion 710. Then, in a state where the cover member 700 and the drum cartridge 100 are set at the insertion position of the apparatus main body 1b, the protrusion 801 pushes the snap fit 712 through the opening 723 in the arrow F direction. Thereby, the engagement of the snap fit 712 is released. Thereby, as described above, the lid portion 710 of the cover member 700 can be opened.

  Next, as shown in FIG. 27A, the lid 710 is opened. As a result, the operator can access the drum cartridge 100. At this time, the engagement between the stopper portion 714 and the protruding portion 110 described with reference to FIG. 22 is disengaged, and the drum cartridge 100 can be moved in the insertion direction of the apparatus main body 1b with respect to the cover member 700. In this state, as shown in FIG. 27B, the drum cartridge 100 is inserted toward a predetermined mounting position of the apparatus main body 1b. At this time, the drum cartridge 100 is guided to be inserted into the cover member 700. Specifically, as shown in FIG. 21, the drum cartridge 100 is placed on the bottom portion 701 of the cover member 700 and is guided along the bottom portion 701 as a guide portion. Further, since the operator can visually recognize both the drum cartridge 100 and the cover member 700, the drum cartridge 100 can be easily inserted. Further, by opening the lid portion 710 after restricting the position of the apparatus main body 1b to the insertion position, it is possible to prevent the photosensitive drum 11 from being exposed or damaged until just before the drum cartridge 100 is inserted.

[Main body lock mechanism]
Next, a main body locking mechanism 900 that locks and unlocks the cover member 700 and the apparatus main body 1b in this embodiment will be described with reference to FIGS. The main body lock mechanism 900 of this embodiment includes an engaging portion 760 and a protruding portion 810 as an engaged portion. The engaging portion 760 is provided on the cover member 700, and the protruding portion 810 is provided on the apparatus main body 1 b and is freely engageable with the engaging portion 760. A pair of protrusions 810 is formed on the upper surface of the surface of the opening 800 of the apparatus main body 1b where the fitting portion 750 of the cover member 700 is fitted so as to protrude downward. When the first predetermined amount of drum cartridge 100 is inserted from the insertion position, the engaging portion 760 and the protruding portion 810 are engaged, and the apparatus main body 1b and the cover member 700 are locked. On the other hand, when the drum cartridge 100 is inserted by a second predetermined amount from the insertion position, the engagement between the engagement portion 760 and the projection 810 is released, and the lock between the apparatus main body 1b and the cover member 700 is released.

  More specifically, the main body lock mechanism 900 further includes an elastic deformation portion 761, a protruding portion 120 as a first engaging portion, and a protruding portion 110 as a second engaging portion. The elastic deformation portion 761 is provided with an engagement portion 760 at the tip, and the engagement portion 760 and the projection portion 810 can be engaged and released by elastic deformation. In this embodiment, notches 762 are formed at two locations on the upper surface of the fitting portion 750, and the elastic deformation portions 761 are formed so as to protrude from the back of each notch 762 toward the front. Yes. The elastic deformation portion 761 is formed of resin integrally with the cover member 700 and can be elastically deformed in the notch 762. Further, an engaging portion 760 that protrudes toward each other is provided at each tip portion of the pair of elastic deformation portions 761. Therefore, the pair of engaging portions 760 approaches or separates when the elastic deformation portion 761 is elastically deformed.

  The protruding portion 120 as the first engaging portion is provided so as to protrude upward at the distal end portion in the insertion direction of the drum cartridge 100. 28A, the protrusion 120 is engaged with the elastic deformation portion 761 in a state where the drum cartridge 100 is disposed on the cover member 700 and is not moved in the insertion direction with respect to the cover member 700. Then, the pair of elastic deformation portions 761 are elastically deformed and spread. Further, the length of the protruding portion 120 in the insertion direction moves relative to the cover member 700 to a position where the drum cartridge 100 does not include the position where the first predetermined amount is between the insertion position and the first predetermined amount. At this time, the elastic deformation portion 761 is engaged. For this reason, in this range, a pair of elastic deformation part 761 is pushed and extended by the protrusion part 120, and as shown to Fig.29 (a), the engaging part 760 and the projection part 810 do not engage.

  The protruding portion 110 as the second engaging portion is provided to protrude upward at the rear end portion in the insertion direction of the drum cartridge 100. Then, as shown in FIG. 28C, when the drum cartridge 100 moves relative to the cover member 700 from the insertion position to the second predetermined amount, the protrusion 110 engages with the elastic deformation portion 761. Then, the pair of elastic deformation portions 761 are elastically deformed and spread. Even in this state, as shown in FIG. 29A, the engaging portion 760 and the protruding portion 810 are not engaged.

  With respect to the insertion direction of the drum cartridge 100, no protrusion or the like that engages with the elastic deformation portion 761 is provided between the protrusion 110 and the protrusion 120. Therefore, the elastic deformation portion 761 does not elastically deform when not engaged with the protrusion 110 and the protrusion 120, and engages the engagement portion 760 with the protrusion 810 as shown in FIG. Position it as possible.

  In the case of this embodiment having such a main body locking mechanism 900, in a state where the drum cartridge 100 covered by the cover member 700 is set at the insertion position shown in FIG. 23, the cover member 700 is attached to the apparatus main body 1b. Is not locked. That is, in a state where the drum cartridge 100 is not inserted, as shown in FIG. 28A, the protrusion 120 pushes the elastic deformation portion 761, and the engagement portion 760 of the cover member 700 is connected to the apparatus main body 1b. It does not engage with the protrusion 810. For this reason, in this state, the cover member 700 and the drum cartridge 100 can still be removed from the apparatus main body 1b.

  In this state, when the first predetermined amount of the drum cartridge 100 is inserted from the insertion position, the engagement between the protruding portion 120 and the elastic deformation portion 761 is released as shown in FIG. Is restored elastically. As a result, as shown in FIG. 29B, the engaging portion 760 and the protruding portion 810 are engaged, and the cover member 700 is locked with respect to the apparatus main body 1b, and the cover member 700 cannot be pulled out.

  In addition, when the drum cartridge 100 inserted more than the first predetermined amount from the insertion position is returned to the insertion position, the lock between the apparatus main body 1b and the cover member 700 is released. That is, when the drum cartridge 100 is returned to the insertion position, as shown in FIG. 28A, the projecting portion 120 spreads the elastic deformation portion 761, and the engagement portion 760 and the projection portion 810 are engaged. The device main body 1b and the cover member 700 are unlocked. Therefore, if the drum cartridge 100 is returned to the insertion position, the cover member 700 and the drum cartridge 100 can be detached from the apparatus main body 1b.

  Further, when the drum cartridge 100 is inserted by a second predetermined amount from the insertion position, the projecting portion 110 and the elastic deforming portion 761 are engaged with each other as shown in FIG. It is pushed out. As a result, as shown in FIG. 29A, the engagement portion 760 and the projection 810 are disengaged, the lock between the cover member 700 and the apparatus main body 1b is released, and the cover member 700 can be pulled out. a.

  As shown in FIG. 30A, in a state where the drum cartridge 100 is pushed to a predetermined position, the cover member 700 is removed from the apparatus main body 1b (FIG. 30B), and then the front cover 400 is closed, whereby the drum The replacement operation of the cartridge 100 is completed.

  In the case of this embodiment as well, as in the first embodiment, the drum cartridge 100 can be removed in a state where the drum cartridge 100 is set at the insertion position of the apparatus main body 1b. When the first predetermined amount of drum cartridge 100 is inserted from the insertion position, apparatus main body 1b and cover member 700 are locked. Further, the lock between the cover member 700 and the apparatus main body 1b cannot be released until the drum cartridge 100 is inserted into the second predetermined amount. Therefore, the cover member 700 is not inadvertently detached from the apparatus main body 1b when the drum cartridge 100 is inserted, and the drum cartridge 100 can be mounted up to a predetermined mounting position while being guided by the cover member 700.

  In the case of this embodiment, a mechanism for locking and unlocking the drum cartridge 100 and the cover member 700 is not provided, but it may be provided similarly to the first embodiment. Other configurations and operations are the same as those in the first embodiment.

<Other embodiments>
In each of the above-described embodiments, the case where the drum cartridge 100 is applied as a unit that can be inserted into and removed from the apparatus main body has been described. However, the unit of the present invention may be another unit. For example, a charging unit having only a charging function, a developing unit having only development, a cleaner unit having only a cleaner function, a transfer unit having a transfer function, a fixing unit having a fixing function, etc. . In the case of the charging unit, the image forming member for forming an image is, for example, the charging roller 12. Similarly, in the case of the developing unit, the image forming member is, for example, the developing sleeve 14a. In the case of the cleaner unit, the image forming member is, for example, the cleaning blade 15. In the case of the transfer unit, the image forming member is, for example, the intermediate transfer belt 61. In the case of the fixing unit, the image forming member is, for example, a heating roller 41 and a pressure roller 42. The unit of the present invention may be a process cartridge in which the drum cartridge 100 and the developing device 14 are combined.

  Here, when these various units are applied to the tandem type image forming apparatus described above, a plurality of units are arranged side by side. In this case, the units may have a common configuration. In this case, if the configuration is the same except for the toner color, such as the developing unit and the process cartridge, the unit may be placed in the wrong color position. Even in such a case, the present invention can be detached from the apparatus main body only by setting the unit at the insertion position.

  DESCRIPTION OF SYMBOLS 1 ... Image forming apparatus / 1a, 1b ... Apparatus main body / 11 ... Photosensitive drum (image forming member) / 100 ... Drum cartridge (unit) / 102 ... Rib (guide part) / 103 ... Guide (guide part) / 104 ... Lock guide part / 105 ... Lock engagement part / 106 ... Lock release guide part / 110 ... Protrusion part (second engagement part) / 120 ... Projection part (first engagement part) / 200, 700 ... Cover member / 202a ... Drum guide (guide part) / 203a ... Retention rib (guide part) / 210 ... Oscillation Plate (moving member) / 211... Projection / 212, 760... Engagement part / 301... Support part / 305... Projection (engaged part) / 500. (Unit lock means) / 600, 900 ... Main unit lock Mechanism (main body locking means) / 701 ... bottom (guide portion) / 761 ... resilient deformation part / 800 ... opening (supporting portion) / 810 ... protrusion (engaged portion)

The present invention is a copying machine, a printer, a facsimile, a cartridge such as detachable drum cartridge to the apparatus main body of an image forming apparatus such as a complex machine thereof having a plurality of functions, and relates to an image forming apparatus.

Conventionally, there is a configuration in which a unit (cartridge ) such as a drum cartridge or a process cartridge can be inserted into and removed from the apparatus main body. As such a unit, there is a unit having a cover member for protecting an internal member such as a photosensitive drum. In addition, in this configuration having the cover member, when the unit is inserted into the apparatus main body, a configuration is proposed in which the cover member is detached from the unit by engaging a part of the cover member and the apparatus main body ( For example, Patent Document 1).

  Further, a configuration is proposed in which the cover member is locked to the apparatus main body when the unit is set at the insertion position of the apparatus main body, and the lock is released after the unit is inserted into a predetermined position of the apparatus main body (for example, a patent). Reference 2). Further, a configuration has been proposed in which the cover member is locked to the apparatus main body when the unit is set at the insertion position of the apparatus main body, and this lock can be released at any time (for example, Patent Document 3). In the case of the configurations described in Patent Documents 2 and 3, the unit is guided by a cover member locked to the apparatus main body. Further, in the case of the configuration described in Patent Document 3, the unit and the cover member are locked, and the lock between the unit and the cover member is released by performing the insertion operation of the unit while being attached to the apparatus main body. .

JP 2002-132120 A JP 2007-240661 A JP 2010-78703 A

  In the case of the configuration described in Patent Document 1, the cover member is not locked with respect to the apparatus main body when the unit is set at the insertion position of the apparatus main body, so that the unit including the cover member is inadvertently detached from the apparatus main body. There is a possibility.

  On the other hand, in the case of the configuration described in Patent Document 2, the cover member is locked with respect to the apparatus main body when the unit is set at the insertion position of the apparatus main body, but the lock is kept until the unit is mounted at a predetermined position of the apparatus main body. It will not be released. In this case, when the unit is attached by mistake, the cover member cannot be removed from the apparatus main body unless the unit is inserted to a predetermined position. Then, the unit inserted up to a predetermined position is removed without being covered by the cover member, and an image forming member such as a photosensitive drum disposed in the unit is exposed.

  Further, for example, a case where a configuration in which the lock between the unit and the cover member is released at the time of the unit insertion operation as described in Patent Document 3 will be considered. In this case, if the lock mechanism between the unit and the cover member fails and the lock cannot be released, the unit cannot be inserted to a predetermined position, and the lock between the cover member and the apparatus main body cannot be released.

  On the other hand, in the case of the configuration described in Patent Document 3, the lock between the cover member and the apparatus main body can be released at any time. However, it is desirable that the lock between the cover member and the apparatus main body not be removed until the unit is inserted into the apparatus main body to some extent. This is because if the cover member is detached from the apparatus main body during the insertion of the unit, the unit guided by the cover member may fall out of the apparatus main body. Further, if the cover member is detached from the apparatus main body during the insertion of the unit, an image forming member such as a photosensitive drum disposed in the unit may be exposed.

In view of such circumstances, in the state where the set cartridge insertion start position of the apparatus main cartridge removable, and the cartridge does not come off the locking between the cover member and the apparatus body until it is somewhat inserted It was invented to realize the configuration.

The cartridge of the present invention is detachably provided to the apparatus main body of the image forming apparatus, and includes a cartridge main body provided with image forming means, and a cover member that covers the image forming means and engages with the cartridge main body. An insertion portion that is provided on the cover member and is inserted into the apparatus main body when the cartridge main body is attached to the apparatus main body, and a lock member that locks the apparatus main body and the cover member. A lock member movable to a lock position for locking the cover member and the apparatus main body and an unlock position for releasing the lock; and the cartridge main body in a state where the insertion portion is inserted into the apparatus main body. the lock in conjunction with the movement of the cartridge body from the insertion starting position for the previous SL apparatus main body to a position to be inserted first predetermined amount The member is moved to the lock position, the cartridge present body second predetermined amount inserted is greater than the first predetermined amount relative to said insertion start position from the inserted position the first predetermined amount relative to the apparatus main body Moving means for moving the lock member to the unlock position in conjunction with the movement of the cartridge main body to the position to be moved .
The cartridge of the present invention is provided to be detachable to the apparatus main body of the image forming apparatus, and covered with the cartridge body having an image forming means, said image forming means, engageable with said cartridge body a cover member which is provided on the cover member to lock an insertion portion to be inserted to the cartridge body to the apparatus main body when attached to the apparatus main body, and said cover member and the instrumentation Okimoto body A lock member that is movable to a lock position that locks the cover member and the apparatus main body and an unlock position that releases the lock, and the insertion portion is inserted into the apparatus main body wherein in conjunction with the movement of a predetermined amount from the insertion start position relative to the apparatus main body of the cartridge body moving the locking member into the locking position, before the Mounting operation relative to the apparatus main body of the cartridge body, characterized that you comprising a moving means for moving the locking member to the unlocked position until Ryosuru complete, the.

According to the present invention, in the state where the set cartridge insertion start position of the apparatus main body cartridge is removable, and the cartridge can not come off the locking between the cover member and the apparatus body until it is somewhat inserted.

1 is a schematic sectional view of an image forming apparatus according to a first embodiment. The side view which looked at the drum cartridge which concerns on 1st Embodiment from the right side of (a) perspective view, (b) sectional drawing, (c) (b). The (a) perspective view of the cover member which concerns on 1st Embodiment, (b) The perspective view seen from the insertion direction front end side. The perspective view which looked at the cover member which concerns on 1st Embodiment from the angle different from FIG.3 (b) from the (a) insertion direction front end side, (b) The side view which expands and shows a part. The drum cartridge which concerns on 1st Embodiment shows the state protected by the cover member, (a) Perspective view, (b) Sectional drawing. Sectional drawing which shows the locked state of the drum cartridge and cover member which concern on 1st Embodiment. FIG. 2A is a perspective view showing a state where a front cover is opened in a part of the apparatus main body according to the first embodiment, and FIG. 3B is a perspective view showing a state where a drum cartridge is taken out from the apparatus main body. FIG. 2A is a perspective view showing a state where a drum cartridge is installed on a rail in a part of the apparatus main body according to the first embodiment, and FIG. Sectional drawing which shows the locking mechanism of the drum cartridge and rail which concern on 1st Embodiment. FIG. 2A is a perspective view illustrating a state in which the drum cartridge is set at an insertion position via a cover member in a part of the apparatus main body according to the first embodiment, and FIG. 2B is a state in which the drum cartridge is inserted into the apparatus main body. FIG. The perspective view which shows the to-be-inserted part of a drum cartridge in a part of apparatus main body which concerns on 1st Embodiment. The drum cartridge according to the first embodiment is mounted on the apparatus main body, (a) in the first step, and (b) in the second step, the engaging portion of the moving member and the engaged portion of the apparatus main body, respectively. Sectional drawing which shows the relationship. (A) Sectional view showing the relationship between the engaging portion of the moving member and the engaged portion of the apparatus main body in the third step of mounting the drum cartridge according to the first embodiment on the apparatus main body, (b) movement The figure which shows the relationship between the protrusion part of a member, and the lock engaging part of an apparatus main body. (A) Sectional view showing the relationship between the engaging portion of the moving member and the engaged portion of the apparatus main body in the fourth step of mounting the drum cartridge according to the first embodiment on the apparatus main body, (b) movement The figure which shows the relationship between the protrusion part of a member, and the lock guide part of an apparatus main body. FIG. 5A is a cross-sectional view showing the relationship between the engaging portion of the moving member and the engaged portion of the apparatus main body in the fifth step of mounting the drum cartridge according to the first embodiment on the apparatus main body, and FIG. The figure which shows the relationship between the protrusion part of a member, and the lock release guide part of an apparatus main body. FIG. 2A is a perspective view showing a state where a drum cartridge is mounted on the apparatus main body, and FIG. 4B is a perspective view showing a state where a front cover is closed, in a part of the apparatus main body according to the first embodiment. (A) The perspective view shown in the state which opened the cover part of the cover member which concerns on 2nd Embodiment, (b) The perspective view shown in the state which closed the cover part. (A) The perspective view which expands and shows the hinge part of the cover member which concerns on 2nd Embodiment, (b) Sectional drawing shown in the state which closed the cover part. The cover member which concerns on 2nd Embodiment, (a) Top view, (b) AA sectional drawing of (a). (A) B part enlarged view of FIG.19 (b), (c) C part enlarged view. Sectional drawing which shows the state by which the drum cartridge which concerns on 2nd Embodiment is protected by the cover member. The left end enlarged view of FIG. (A) Perspective view showing a state before the drum cartridge is set in the apparatus main body, (b) The drum cartridge is set in the insertion position via the cover member in a part of the apparatus main body according to the second embodiment. The perspective view which shows a state. (A) A perspective view showing a state before removing the end cover member from the cover member according to the second embodiment, (b) a perspective view showing a state in the middle of removal, and (c) a state after removing. FIG. Sectional drawing which shows the state which set the drum cartridge provided with the cover member which concerns on 2nd Embodiment to the apparatus main body. The D section enlarged view of FIG. (A) A perspective view showing a state in which the cover part of the cover member set at the insertion position is opened in a part of the apparatus main body according to the second embodiment; (b) in the middle of inserting the drum cartridge into the apparatus main body. The perspective view which shows a state. The relationship between the elastically deformable portion and the cover member according to the second embodiment is as follows: (a) a perspective view showing a state where insertion of the drum cartridge into the apparatus main body is not started; (b) a perspective view showing a state during the insertion. FIG. 4C is a perspective view showing a state immediately before the insertion is completed. (A) The figure which shows a lock release state of the cover member and apparatus main body which concern on 2nd Embodiment, (b) The figure which shows a lock state. FIG. 7A is a perspective view showing a part of the apparatus main body according to the second embodiment, in which (a) a drum cartridge is mounted on the apparatus main body, and (b) a perspective view showing a state in which a cover member is removed from the apparatus main body.

<First Embodiment>
A first embodiment of the present invention will be described with reference to FIGS. First, a schematic configuration of the image forming apparatus of the present embodiment will be described with reference to FIG.

[Image forming apparatus]
The image forming apparatus 1 includes an image forming unit 10 for each color of Y (yellow), M (magenta), C (cyan), and K (black). The image forming apparatus 1 according to the present embodiment has a so-called tandem configuration in which the image forming units 10 of the respective colors are arranged in the rotational direction of the intermediate transfer belt 61. In the image forming unit 10 for each color, image formation is performed as follows. A photosensitive drum (photosensitive member) 11 serving as an image carrier is charged on its surface by a laser scanner 13 that is uniformly charged on the surface by a charging roller 12 and then driven based on a signal of transmitted image information. Is formed. Note that the image forming apparatus 1 of the present embodiment includes an image reading device 2, and the image information described above includes image information of a document read by the image reading device 2 and a personal computer connected to the image forming device 1. There is image information sent from an external terminal such as a computer.

  The latent image formed on the photosensitive drum 11 as described above is visualized as a toner image by the developing device 14, and a toner image corresponding to each color is formed on the photosensitive drum 11. That is, the developing device 14 includes a developing sleeve 14 a as a developer carrying member at a position facing the photosensitive drum 11. The developing sleeve 14a rotates while carrying the developer in the developing unit 14, and a predetermined developing bias is applied between the developing sleeve 14a and the photosensitive drum 11, thereby supplying toner to the photosensitive drum 11. The latent image is developed with toner.

  The toner images respectively formed on the photosensitive drums 11 of the respective colors are sequentially transferred to the intermediate transfer belt 61 by applying a predetermined pressing force and an electrostatic load bias by the primary transfer roller 17. After the transfer, a small amount of residual toner remaining on the photosensitive drum 11 is removed and collected by the cleaning blade 15 to prepare for the next image formation again. Since toner in the developing device 14 is consumed by such image formation, the toner is supplied from the toner cartridge 19 to the developing device 14.

  On the other hand, recording materials (sheets such as paper) P are fed one by one from the paper feed cassette 20 and conveyed to the registration roller pair 23. The recording material P has a leading edge that follows the nip portion of the registration roller pair 23 to form a loop, thereby correcting skew. Thereafter, the registration roller pair 23 conveys the recording material P between the intermediate transfer belt 61 and the secondary transfer outer roller 35 in synchronization with the toner image on the intermediate transfer belt 61. The toner image on the intermediate transfer belt 61 is applied to the recording material P by applying a predetermined pressurizing force and an electrostatic load bias at the nip portion between the driving roller 62 and the secondary transfer outer roller 35 disposed opposite to each other. Transcribed. After the transfer, a slight residual toner remaining on the intermediate transfer belt 61 is removed and collected by the cleaning unit 70, and is again prepared for the next image formation.

  The toner image transferred onto the recording material P is fixed on the recording material P by being heated and pressed at the nip portion between the heating roller 41 and the pressure roller 42 of the fixing device 40. The recording material P on which the toner image is fixed is discharged onto the paper discharge tray 51 by the paper discharge roller pair 50. In the image forming apparatus 1 of the present embodiment, a paper discharge tray 51 is provided between the image reading apparatus 2 and the apparatus main body 1a on which the above-described image forming unit 10, the intermediate transfer belt 61, the fixing device 40, and the like are arranged. It has a so-called in-body discharge configuration.

  In the case of the present embodiment, a recording material conveyance unit 3 that conveys the recording material P in the vertical direction is disposed on the right side of FIG. Further, a side cover 90 is provided on the right side surface of the image forming apparatus 1 in FIG. 1 so as to be rotatable about a rotation shaft 91, and is locked to a part of the apparatus main body 1 a by a locking portion 92. The side of the apparatus main body 1a is covered. The side cover 90 can release the side of the apparatus main body 1a by releasing the locking of the locking portion 92, and opens the side cover 90 when the recording material is jammed in the recording material transport unit 3. Thus, the inside of the apparatus main body 1a can be accessed.

[Drum cartridge]
In the case of the present embodiment, the drum cartridge 100 ( cartridge main body ) having the photosensitive drum 11 which is also an image forming member (image forming means) for performing image formation is detachable from the apparatus main body 1a so that it can be replaced. ing. As shown in FIGS. 2A and 2B, the drum cartridge 100 includes a photosensitive drum 11, a charging roller 12, and a cleaning blade 15, which are integrally supported by a housing 101. The photosensitive drum 11 and the charging roller 12 are supported so as to be rotatable with respect to the housing 101, and the charging roller 12 and the cleaning blade 15 are supported while being pressed against the photosensitive drum 11.

  Since the photosensitive drum 11, the charging roller 12, and the cleaning blade 15 are deteriorated when an image is formed, the drum cartridge 100 needs to be replaced according to the print amount. Accordingly, as will be described later, the drum cartridge 100 can be inserted / removed in the frontward direction of the apparatus main body 1a, and can be replaced when it reaches the end of its life. Note that the near side of the apparatus main body 1a is a side on which the user operates the image forming apparatus 1. Hereinafter, the “insertion direction” is the direction in which the drum cartridge 100 is inserted into the apparatus main body 1a, that is, the direction of the arrow α in FIGS. 2 (a) and 2 (c).

  By mounting the drum cartridge 100 on the apparatus main body 1a, the photosensitive drum 11 is drivingly connected to a drive transmission unit of a motor (not shown) on the apparatus main body 1a side via a coupling. Thereby, the photosensitive drum 11 is rotationally driven by the motor. Since the charging roller 12 is pressed by the photosensitive drum 11, it rotates following the photosensitive drum 11.

  As shown in FIGS. 2A to 2C, the housing 101 of the drum cartridge 100 is formed with a rib 102 and a guide 103 which are guided by a cover member 200 which will be described later when inserted into the apparatus main body 1a. As shown in FIGS. 2 (a) and 2 (b), the ribs 102 project laterally at portions near one end of the drum cartridge 100 in the insertion direction on one side surface of the housing 101 (left side surface in FIG. 2 (b)). It is formed as follows. As shown in FIGS. 2B and 2C, the guide 103 is a groove formed on the other side surface of the housing 101 (the right side surface in FIG. 2B) substantially parallel to the insertion direction.

  On the other side of the housing 101, a lock guide portion 104 formed in a groove shape adjacent to the guide 103 is provided.(Lock guide)Is formed along the insertion direction. The lock guide portion 104 is a swing plate 210 provided on a cover member 200 described later.(Lock member)The protrusion 211 is formed so as to be freely engageable with the protrusion 211 (see FIG. 3B, etc.), and the protrusion 211 is engaged and guided. As shown in FIG. 2C, the width of the vertical groove is wider than the lock guide portion 104 at the distal end in the insertion direction of the lock guide portion 104 (the right end of FIG. 2C). A step is formed betweenEngaging recess105 is formed. Further, at the rear end in the insertion direction of the lock guide portion 104 (left end in FIG. 2C), a groove-like unlocking guide portion 106 that is inclined upward toward the rear side in the insertion direction from the lock guide portion 104. (Inclined guide part)Is formed. theseEngaging recess105, the lock guide part 104, and the lock release guide part 106 are successively formed in order. theseEngaging recess105, the lock guide part 104, and the lock release guide part 106 each position the rotational phase of the swing plate 210 at a predetermined position by engaging with the protrusion 211, as will be described later.

[Cover member]
In this embodiment, before the drum cartridge 100 is attached to the apparatus main body 1a, the cover member 200 that covers at least the photosensitive drum 11 is attached to the drum cartridge 100 in order to protect the members such as the photosensitive drum 11. As shown in FIG. 3A, the cover member 200 is long in the insertion direction of the drum cartridge 100 (in the direction of arrow α in FIG. 3A) and is formed in a substantially box shape with the insertion direction leading end side and lower side open. ing. In the following description, the “insertion direction” is also used for the cover member 200 in the same manner as described above, but this is the direction when the cover member 200 is mounted on the drum cartridge 100.

  Such a cover member 200 includes a top plate portion 201, a first side plate portion 202, and a second side plate portion 203, as shown in FIGS. 3 (a), 3 (b), and 4 (a). The first side plate portion 202 and the second side plate portion 203 are respectively provided so as to protrude downward from both end portions in the width direction orthogonal to the insertion direction of the drum cartridge 100 of the top plate portion 201. In the present embodiment, as will be described later, the first side plate portion 202 is arranged in the vertical direction so as to appropriately cover the side of the photosensitive drum 11 that faces the developing device 14 of the drum cartridge 100 and is exposed in a wide range. Is made longer than the second side plate portion 203.

  As shown in FIG. 3B, the first side plate portion 202 has a groove-shaped drum guide 202a formed along the insertion direction on the inner surface thereof. As shown in FIG. 4A, the second side plate portion 203 is formed with protruding holding ribs 203a at both end portions of the inner side surface in the insertion direction.

  Further, an insertion portion 204 to be inserted at a predetermined position of the apparatus main body 1a is provided at the distal end portion of the cover member 200 in the insertion direction. On the rear side of the insertion portion 204 in the insertion direction, an abutting portion 205 that abuts a part of the apparatus main body 1a when inserted into the apparatus main body 1a is formed. Further, as shown in FIGS. 3B and 4A, the front end side of the cover member 200 in the insertion direction is opened so that the attached drum cartridge 100 can be inserted and removed. As shown in FIG. 3A, the rear end side of the cover member 200 in the insertion direction connects the rear end portion of the second side plate portion 203 and the first side plate portion 202 within the range of the length of the second side plate portion 203. As shown in FIG.

  Further, as shown in FIGS. 3A and 4B, a swing plate 210 as a moving member is disposed on the distal end side in the insertion direction of the second side plate portion 203. The swing plate 210 swings in the direction of arrow β in FIG. 4B with respect to the second side plate portion 203 of the cover member 200 about a swing shaft (not shown) orthogonal to the side surface of the second side plate portion 203. It is provided freely (movable). The swing plate 210 is formed so that the vertical width on the front end side in the insertion direction is small and the vertical width on the rear end side in the insertion direction is large.

  A protruding portion 211 that protrudes toward the inside of the cover member 200, that is, toward the drum cartridge 100 covered by the cover member 200, is provided at the tip of the swing plate 210. In the second side plate portion 203, a through hole 203 b is formed in the region corresponding to the distal end portion in the insertion direction of the swing plate 210 along the swing direction of the swing plate 210. As shown in FIGS. 3B and 4A, a protruding portion 211 formed at the tip of the swing plate 210 protrudes into the cover member 200 through the through hole 203b. Thereby, the swinging plate 210 can swing within a range in which the protruding portion 211 can move in the through hole 203b. Further, at the upper end near the rear end of the swinging plate 210, the engaging portion 212 protruding to the opposite side of the second side plate portion 203 is provided. (Lock engagement part)Is provided.

[Mounting the drum cartridge to the cover member]
As shown in FIGS. 5 and 6, the drum cartridge 100 is mounted on the cover member 200 configured as described above. Specifically, the drum cartridge 100 is inserted from the opening on the front end side of the cover member 200. At this time, as shown in FIG. 5B, the rib 102 formed on one side surface of the housing 101 of the drum cartridge 100 has a drum guide 202 a formed on the inner side surface of the first side plate portion 202 of the cover member 200. Engage. The holding rib 203 a formed on the inner side surface of the second side plate portion 203 engages with the guide 103 formed on the other side surface of the housing 101.

  The drum cartridge 100 is guided into the cover member 200 along the insertion direction by engaging the guides and the ribs as guide portions. With the drum cartridge 100 mounted on the cover member 200 in this way, the space in which the photosensitive drum 11 and the like are disposed is covered with the top plate portion 201, the first side plate portion 202, and the second side plate portion 203. The photosensitive drum 11 and the like are not exposed to the outside.

The drum cartridge 100 and the cover member 200 are locked so as not to be separated in the mounted state. Therefore, as shown in FIG. 6, the protrusion 211 of the swing plate 210 provided on the cover member 200 is formed on the front end side in the insertion direction on the other side of the housing 101 of the drum cartridge 100 in the mounted state. It engages with the engaging recess 105. Thereby, it is possible to prevent the drum cartridge 100 from being pulled out from the opening on the distal end side in the insertion direction of the cover member 200. That is, the drum cartridge 100 cannot be moved relative to the cover member 200 in the direction of the arrow α in FIG. Since the rear end side of the cover member 200 in the insertion direction is covered with the rear plate 206, the drum cartridge 100 is not pulled out from the rear end side in the insertion direction.

[Drum cartridge replacement]
Next, replacement of the drum cartridge 100 of this embodiment will be described. First, the operation of extracting the drum cartridge 100 attached to the apparatus main body 1a will be described with reference to FIGS.

[Drum cartridge removal]
FIG. 7 is a schematic diagram that simply shows the configuration of a portion of the image forming apparatus 1 according to the present embodiment where the drum cartridges 100 of the respective colors are mounted. The apparatus main body 1a is provided with a front cover 400 that can be freely opened and closed on the front side, and as shown in FIG. 7A, the drum cartridge 100 of each color can be accessed by opening the front cover 400. In the apparatus main body 1a, a plurality of drum cartridges 100 can be arranged in the order of yellow, magenta, cyan, and black from the left in FIG. In the present embodiment, the plurality of drum cartridges 100 have a common configuration. The cover members 200 that cover the drum cartridges 100 of the respective colors are also common to each other. In FIG. 7A, each color developing device 14 is arranged adjacent to each color drum cartridge 100.

  In the following description, replacement of the cyan (third from the left in FIG. 7A) drum cartridge 100 will be described, but the same applies to drum cartridges of other colors. It is assumed that the cyan drum cartridge 100 replacement sign is notified to a display unit (for example, an operation panel) (not shown) of the image forming apparatus 1 or a connected external terminal. In this case, an operator such as a user or a service person opens the front cover 400 as shown in FIG. Next, as shown in FIG. 7B, the corresponding drum cartridge 100 is extracted from the apparatus main body 1a.

  Here, as shown in FIGS. 8 and 9, the drum cartridge 100 is locked so as not to come out of a predetermined mounting position of the apparatus main body 1a. That is, as shown in FIG. 8A, the drum cartridge 100 is provided in the apparatus main body 1 a and is placed on a guide rail 410 that guides the drum cartridge 100. As shown in FIG. 8B, the guide rail 410 is provided with a lock claw 411 that is movable in part in the vertical direction by elastic deformation and whose tip protrudes upward. When the drum cartridge 100 is mounted at a predetermined mounting position of the apparatus main body 1a, the lock claw 411 engages with an engagement hole 16a provided at a predetermined position on the lower surface of the drum cartridge 100 as shown in FIG. Thus, it is locked at the mounting position.

  Moreover, as shown in FIG. 9, the lock release member 16b is arrange | positioned in the engagement hole 16a. The lock release member 16b is movable along an engagement hole 16a formed in the vertical direction, and has an operation lever 16c exposed to the front surface of the drum cartridge 100 and operable by an operator. When the operator depresses the operation lever 16c in the direction of the arrow γ in FIG. 9, the lock release member 16b is also lowered, the lock claw 411 is pushed down, and the engagement between the lock claw 411 and the engagement hole 16a is released. Thereby, the lock of the drum cartridge 100 is released, and the drum cartridge 100 can be extracted from the apparatus main body 1a in the direction of the arrow δ in FIG.

  Since the drum cartridge 100 has been used after the drum cartridge 100 has been pulled out, the protection after pulling out may be rough compared to when the drum cartridge 100 is inserted. The drum cartridge 100 after being pulled out is collected by a service person or the like. Note that when the drum cartridge 100 is pulled out, the cover member 200 may be attached to an insertion position, which will be described later, of the apparatus main body 1a to guide the drum cartridge 100 into the cover member 200. Thereby, for example, even if the toner adheres to the photosensitive drum 11 or the like, it is possible to prevent the operator from getting dirty.

[Installing the drum cartridge]
Next, the operation of mounting the drum cartridge 100 to the apparatus main body 1a will be described with reference to FIGS. First, as shown in FIG. 10A, the operator inserts a new drum cartridge 100 covered by the cover member 200 into the insertion position of the apparatus main body 1a. Then, as shown in FIG. 10B, the drum cartridge 100 is inserted into the apparatus main body 1a by being moved relative to the cover member 200 in the insertion direction.

  Here, as shown in FIG. 11, the insertion portion 300 into which the drum cartridge 100 of the apparatus main body 1a is inserted has a support portion that can be engaged with the insertion portion 204 provided at the distal end portion in the insertion direction of the cover member 200. 301 is formed. The support portion 301 supports the cover member 200 and the drum cartridge 100 on the apparatus main body 1a in a state where the drum cartridge 100 covered by the cover member 200 is inserted by a predetermined amount toward the insertion position of the apparatus main body 1a.

  Specifically, the support portion 301 is formed so as to be recessed above the insertion portion 300 and to have a predetermined length in the insertion direction, and the support surface 302 is formed on the upper surface, and both ends of the support surface 302 in the width direction. The guide rib 304 is formed in the side wall 303 along the insertion direction. In addition, a protrusion 305 formed so as to protrude downward is provided on an end of the guide rib 304 on one side (the right side in FIG. 11) on the receiving side of the drum cartridge 100 (the left end in FIG. 12A).

  On the other hand, the insertion portion 204 of the cover member 200 has a contact surface 204a and an engagement rib 204b as shown in FIGS. 3 and 12A. The contact surface 204a contacts the support surface 302 in a state where the cover member 200 is inserted into the apparatus main body 1a. The engaging ribs 204b are respectively placed on the guide ribs 304 on both sides in the width direction of the contact surface 204a and can engage with the guide ribs 304.

  When the drum cartridge 100 covered by the cover member 200 is inserted toward the insertion position of the apparatus main body 1a, the insertion part 204 of the cover member 200 is inserted into the support part 301 of the apparatus main body 1a. In this state, the contact surface 204a contacts the support surface 302, and the engagement rib 204b is supported by the guide rib 304, whereby the cover member 200 is guided toward the insertion position.

[First step]
Then, as shown in FIG. 12A, the engaging portion 212 of the swing plate 210 provided on the cover member 200 is formed on the guide rib 304 on one side in a state where the cover member 200 is inserted by a predetermined amount Y. It comes into contact with the front surface of the protruding portion 305. The front surface of the protrusion 305 is a surface on the side where the cover member 200 and the drum cartridge 100 are inserted, and is a front surface of the apparatus main body 1a. The rear surface of the protrusion 305 described later is the back side of the front surface and the back surface of the apparatus main body 1a.

  Here, the interval X between the support surface 302 and the upper surface of the guide rib 304 is formed to be slightly larger than the interval between the contact surface 204a of the insertion portion 204 and the lower surface of the engagement rib 204b. And the support part 301 are small. Therefore, the drum cartridge 100 covered by the cover member 200 is supported with respect to the apparatus main body 1a in a state where the insertion portion 204 is inserted into the support portion 301 by a predetermined amount Y. That is, even if the operator releases his / her hands from the cover member 200 and the drum cartridge 100, they will not fall out of the apparatus main body 1a.

[Second step]
Next, when the cover member 200 and the drum cartridge 100 are further inserted from the state shown in FIG. 12A, the swing plate 210 provided on the cover member 200 is engaged with the engaging portion 212 as shown in FIG. And begins to rotate in the β1 direction by engagement with the protrusion 305. 12A and 12B, the protrusion 211 of the swing plate 210 remains engaged with the engagement recess 105 of the drum cartridge 100, as shown in FIG. 100 is locked to the cover member 200.

[Third step]
Next, when the cover member 200 and the drum cartridge 100 are further inserted, as shown in FIG. 13A, the swinging plate 210 further rotates in the arrow β1 direction, and the engaging portion 212 passes below the protruding portion 305. To do. At this time, the contact portion 205 of the cover member 200 contacts the contacted surface 306 which is a part of the apparatus main body 1a, and the cover member 200 is not inserted any more. In this state, the cover member 200 and the drum cartridge 100 are located at the insertion position of the apparatus main body 1a. Further, as shown in FIG. 13B, the protrusion 211 and the engagement recess 105 are disengaged, and the cover member 200 and the drum cartridge 100 are unlocked. Then, the drum cartridge 100 can move in the insertion direction with respect to the cover member 200.

That is, in the case of the present embodiment, when the drum cartridge 100 covered by the cover member 200 is arranged at the insertion position (position shown in FIG. 13A), the lock between the drum cartridge 100 and the cover member 200 is released. Thus, in the case of the present embodiment, the unit lock mechanism 500 is provided as a unit lock unit that locks and unlocks the drum cartridge 100 and the cover member 200. The unit lock mechanism 500 includes an engaging part 212, a protruding part 305 as an engaged part, a swinging plate 210 as a moving member, a protruding part 211, and an engaging concave part 105.

As described above, the engaging portion 212 is provided on the cover member 200. The protruding portion 305 as the engaged portion is provided on the apparatus main body 1a and is freely engageable with the engaging portion 212. An oscillating plate 210 as a moving member is provided with an engaging portion 212 and is arranged to be movable (swingable) with respect to the cover member 200. The protrusion 211 protrudes toward the drum cartridge 100 provided on the swing plate 210 and covered by the cover member 200. The engagement recess 105 is engageable with the protrusion 211 and locks the drum cartridge 100 and the cover member 200 in a state of being engaged with the protrusion 211. On the other hand, when the drum cartridge 100 covered by the cover member 200 is arranged at the insertion position, the engagement recess 105 moves the swinging plate 210 due to the engagement portion 212 engaging the protrusion 305, and the protrusion The engagement with 211 is released.

As shown in FIG. 13B, a release portion 105 a that is recessed above the lock guide portion 104 is formed above the engagement recess 105. For this reason, the protruding portion 211 can move above the position of the lock guide portion 104, and the swing plate 210 can also swing in the direction of the arrow β1. As a result, the position of the engaging portion 212 can be further lowered with respect to the protrusion 305, and the engagement can be released more reliably.

As described above, the drum cartridge 100 unlocked from the cover member 200 by releasing the engagement between the protruding portion 211 and the engaging recess 105 is guided to the cover member 200 while being in the apparatus main body 1a. It becomes possible to insert in. That is, as shown in FIG. 5B, the rib 102 of the drum cartridge 100 is engaged with the drum guide 202 a of the cover member 200, and the holding rib 203 a of the cover member 200 is engaged with the guide 103 of the drum cartridge 100. Match. Therefore, these engagements allow the drum cartridge 100 to be inserted into the apparatus main body 1a while being guided by the cover member 200.

[Fourth step]
When only the drum cartridge 100 is inserted from the insertion position (insertion start position) toward the mounting position of the apparatus body 1a, the first predetermined amount (first predetermined amount) is inserted, as shown in FIG. 14 (a). The plate 210 (locking member) rotates in the arrow β2 direction opposite to the arrow β1 direction described above. At this time, the contact portion 205 of the cover member 200 contacts the contacted surface 306 which is a part of the apparatus main body 1a, and the cover member 200 is not inserted any more. Thus, the engaging portion 212 that has passed through the protrusion 305 is disposed at a position where it can engage with the rear surface of the protrusion 305.

  That is, when the first predetermined amount of drum cartridge 100 is inserted from the insertion position, the protruding portion 211 of the swing plate 210 moves relative to the drum cartridge 100 as shown in FIG. Engage with the lock guide 104. At this time, the protruding portion 211 positioned above the lock guide portion 104 by the release portion 105a is guided by an inclined portion 105b formed between the release portion 105a and the upper surface of the lock guide portion 104, thereby locking. Engages with the guide portion 104. As a result, as shown in FIG. 14A, the swinging plate 210 swings in the direction of the arrow β2, and the engaging portion 212 moves to a position where it can engage with the protruding portion 305. And the cover member 200 is locked with respect to the apparatus main body 1a, and the cover member 200 cannot be removed from the apparatus main body 1a.

Thus, in the case of this embodiment, it has the main body locking mechanism 600 as a main body locking means for locking and unlocking the apparatus main body 1a and the cover member 200. The main body lock mechanism 600 includes an engaging portion 212 and a protrusion 305 as an engaged portion. Then, the main body lock mechanism 600 engages the engaging portion 212 and the protruding portion 305 when the drum cartridge 100 is inserted from the insertion position by a first predetermined amount. On the other hand, as will be described later, when the drum cartridge 100 is inserted into the second predetermined amount from the insertion position ( second predetermined amount from the position where the first predetermined amount is inserted ) , the main body locking mechanism 600 is engaged with the engaging portion 212 and the protrusion 305. Release the engagement.

  More specifically, the main body lock mechanism 600 also includes a swing plate 210 as a moving member, a protruding portion 211, a lock guide portion 104, and a lock release guide portion 106. The lock guide portion 104 is within a range in which the drum cartridge 100 moves relative to the cover member 200 to a position that does not include a position that becomes the second predetermined amount between the first predetermined amount and the second predetermined amount. It is formed substantially parallel to the insertion direction. The lock guide portion 104 has a protruding portion so that the rocking plate 210 is held at an engaging position where the engaging portion 212 and the protruding portion 305 engage when the drum cartridge 100 moves in this range. 211 is engaged and guided. On the other hand, the lock release guide portion 106 swings to an engagement release position where the engagement between the engagement portion 212 and the protrusion 305 is released when the drum cartridge 100 is moved to a position where the second predetermined amount is reached. The protrusion 211 is engaged and guided so as to move the plate 210. This point will be described later.

As described above, in the present embodiment, the main body lock mechanism 600 includes the above-described unit lock mechanism 500, the engaging portion 212, the protruding portion 305 as the engaged portion, the swing plate 210 as the moving member, and the protruding portion 211. The configuration is common. Further, the lock guide portion 104 and the lock release guide portion 106 are grooves formed continuously with the engagement recess 105. For this reason, the main body lock mechanism 600 and the unit lock mechanism 500 have a common configuration as a mechanism.

  Here, even if the cover member 200 is pulled out from the apparatus main body 1a in a state where the cover member 200 is locked to the apparatus main body 1a, the cover member 200 cannot be pulled out from the apparatus main body 1a. That is, in this state, as shown in FIG. 14B, the swinging of the swinging plate 210 is restricted by the engagement of the protruding portion 211 and the lock guide portion 104, so the engaging portion 212 and the protruding portion The state of engagement with the rear surface of 305 is maintained. For this reason, the cover member 200 cannot be pulled out from the apparatus main body 1a.

On the other hand, when the drum cartridge 100 that has been inserted from the insertion position by a first predetermined amount or more is returned to the insertion position, the lock between the apparatus main body 1a and the cover member 200 is released. That is, when the drum cartridge 100 is returned to the insertion position, the protruding portion 211 moves to the region of the engaging recess 105 on the distal side in the insertion direction with respect to the lock guide portion 104 as shown in FIG. As a result, the swing plate 210 can swing in the direction of the arrow β1, and as shown in FIG. 13A, the engagement between the engagement portion 212 and the protrusion 305 is released, and the apparatus main body 1a and the cover member are disengaged. The lock with 200 is released. Therefore, if the drum cartridge 100 is returned to the insertion position, the cover member 200 and the drum cartridge 100 can be detached from the apparatus main body 1a.

  The first predetermined amount described above may be a distance that allows the drum cartridge 100 to move in the insertion direction with respect to the cover member 200 from the insertion position shown in FIG. In other words, the cover member 200 and the apparatus main body 1a may be locked by pushing only the drum cartridge 100 from the state where the operator sets the drum cartridge 100 and the cover member 200 at the insertion position. In other words, the cover member 200 and the apparatus main body 1a are locked when only the drum cartridge 100 moves in the insertion direction due to momentum when the operator sets the drum cartridge 100 and the cover member 200 at the insertion position. To the extent that it is not. For this reason, the first predetermined amount is set to be larger than, for example, rattling in the insertion direction of the locked drum cartridge 100 and the cover member 200.

[Fifth step]
When only the drum cartridge 100 is further inserted from this state toward the mounting position of the apparatus main body 1a, the swinging plate 210 rotates in the direction of arrow β1, as shown in FIG. And the engaging part 212 of the rocking | swiveling plate 210 is located under the protrusion part 305 (engagement release position), and these engagements are cancelled | released. As a result, the lock between the apparatus main body 1a and the cover member 200 is released, and the cover member 200 can be detached from the apparatus main body 1a.

  That is, when the drum cartridge 100 is inserted from the insertion position by a second predetermined amount that is larger than the first predetermined amount, the protruding portion 211 of the swing plate 210 moves relative to the drum cartridge 100 as shown in FIG. Move relative. Then, the protruding portion 211 engages with the lock release guide portion 106. As described above, since the unlocking guide part 106 is inclined upwardly toward the rear side in the insertion direction with respect to the locking guide part 104, the protruding part 211 is guided while being engaged with the unlocking guide part 106. As a result, the swing plate 210 rotates in the direction of the arrow β1. As a result, as shown in FIG. 15A, the swing plate 210 swings in the direction of the arrow β1, and the engaging portion 212 moves to a position where it does not engage with the protruding portion 305.

  Further, the guide 103 and the lock release guide portion 106 formed on the other side surface (the right side surface in FIG. 2B) of the housing 101 of the drum cartridge 100 are open to the rear end in the insertion direction on the other side surface. Here, as shown in FIG. 2A, both side surfaces of the housing 101 are continuous with the rear end surface in the insertion direction and the inclined surface 101a, respectively. The pair of inclined surfaces 101a are inclined in a direction in which the distance between them becomes narrower toward the rear end side in the insertion direction. Therefore, as shown in FIG. 2 (a), the guide 103 and the unlocking guide portion 106 have penetrated to the inclined surface 101a by the depth.

  As a result, the holding rib 203a and the protrusion 211 that engage with the guide 103 and the unlock guide part 106, respectively, can come out from the guide 103 and the unlock guide part 106 in the insertion direction. As shown in FIG. 4A, the drum guide 202a formed on the cover member 200 is also opened to the front side in the insertion direction of the cover member 200. Therefore, the rib 102 of the drum cartridge 100 engaged therewith can be pulled out from the drum guide 202a to the front side in the insertion direction. As described above, the cover member 200 can be removed from the drum cartridge 100 when the cover member 200 is removed from the apparatus main body 1a. That is, the cover member 200 can be detached from the apparatus main body 1a and the drum cartridge 100 when the drum cartridge 100 is inserted into the second predetermined amount.

  The second predetermined amount is preferably set until the drum cartridge 100 is inserted to a predetermined mounting position of the apparatus main body 1a. In the insertion position, as shown in FIGS. 8 and 9, the lock claw 411 of the apparatus main body 1a is engaged with the engagement hole 16a of the drum cartridge 100, and the drum cartridge 100 is locked with respect to the apparatus main body 1a. Is done. For this reason, when the cover member 200 is removed from the apparatus main body 1a, the drum cartridge 100 can be prevented from being pulled out carelessly.

  However, the second predetermined amount may be a position where the center of gravity of the drum cartridge 100 enters the apparatus main body 1a. That is, if the center of gravity of the drum cartridge 100 is on the guide rail 410 of the apparatus main body 1a, the drum cartridge 100 can be prevented from being accidentally dropped from the apparatus main body 1a even if the cover member 200 is removed. Further, in the case of the drum cartridge 100 having the photosensitive drum 11 inside as in the present embodiment, the second predetermined amount may be a position where the photosensitive drum 11 is accommodated in the apparatus main body. That is, if the photosensitive drum 11 is within the apparatus main body 1a, the photosensitive drum 11 is hardly exposed to the outside even if the cover member 200 is removed, and the photosensitive drum 11 is damaged or difficult to be exposed at the time of insertion.

  In any case, the cover member 200 is removed from the apparatus main body 1a and the drum cartridge 100 after the drum cartridge 100 is inserted by the second predetermined amount from the insertion position. In the present embodiment, the cover member 200 is removed after the drum cartridge 100 is inserted to a predetermined mounting position. As a result, the drum cartridge 100 is mounted at a predetermined mounting position as shown in FIG. 16A, and then the front cover 400 is closed as shown in FIG. The work is complete.

  As described above, in this embodiment, the drum cartridge 100 is positioned at the insertion position of the apparatus main body 1a while being protected by the cover member 200, and then the drum cartridge 100 is inserted into the apparatus main body 1a. Therefore, the insertion operation of the apparatus main body 1a can be performed without damaging each member such as the photosensitive drum 11 in the drum cartridge 100. In addition, since the cover member 200 and the drum cartridge 100 are locked by the unit lock mechanism 500 in the state before mounting, it is possible to prevent the cover member 200 from being accidentally removed from the drum cartridge 100 before mounting.

  In the case of this embodiment, the drum cartridge 100 can be removed in a state where the drum cartridge 100 is set at the insertion position of the apparatus main body 1a. That is, as shown in FIG. 13A described above, at the insertion position, the engaging portion 212 provided on the swing plate 210 of the cover member 200 and the protrusion 305 provided on the apparatus main body 1a are engaged. Not done. For this reason, in the state which set the drum cartridge 100 and the cover member 200 in the insertion position, these can be easily removed from the apparatus main body 1a. For this reason, even if the drum cartridge 100 is mistakenly set at the insertion position of the apparatus main body 1a, the drum cartridge 100 can be removed without being accompanied by the insertion operation as described in Patent Document 2 described above.

  In the case of this embodiment, when the drum cartridge 100 is inserted from the insertion position by a first predetermined amount, the apparatus main body 1a and the cover member 200 are locked. Further, the lock between the cover member 200 and the apparatus main body 1a cannot be released until the drum cartridge 100 is inserted by the second predetermined amount. Therefore, the cover member 200 is not inadvertently detached from the apparatus main body 1a when the drum cartridge 100 is inserted, and the drum cartridge 100 can be mounted up to a predetermined mounting position while being guided by the cover member 200.

  For example, if the cover member 200 and the apparatus main body 1a can be unlocked at any time as described in Patent Document 3, the operator mistakenly attaches the cover member 200 to the apparatus main body 1a during the insertion operation of the drum cartridge 100. May be removed. Thus, when the cover member 200 is removed from the apparatus main body 1a during the insertion operation of the drum cartridge 100, the drum cartridge 100 is not guided by the cover member 200, and therefore the insertion operation cannot be performed smoothly. In the present embodiment, since at least the second predetermined amount is the position where the center of gravity of the drum cartridge 100 is located in the apparatus main body 1a, the drum cartridge 100 even if the cover member 200 and the apparatus main body 1a are unlocked in this state. Can be prevented from falling off. After that, the drum cartridge 100 is guided by the guide rail 410 of the apparatus main body 1a, and the insertion operation can be performed smoothly.

  In the present embodiment, the cover member 200 and the drum cartridge 100 are unlocked by disposing the cover member 200 and the drum cartridge 100 at the insertion position. Therefore, the lock between the cover member 200 and the drum cartridge 100 can be released without performing another operation.

  Further, when a failure occurs in the unit lock mechanism 500 that locks and unlocks the cover member 200 and the drum cartridge 100 and this mechanism does not operate, the cover member 200 and the drum cartridge 100 cannot be disposed at the insertion position. . For example, when the swing plate 210 is stuck and does not rotate, the swing plate 210 rotates even if the engaging portion 212 and the projection 305 are engaged when the cover member 200 is set at the insertion position. Without the cover member 200 being inserted into the insertion position. Even if the cover member 200 can be disposed at the insertion position, the drum cartridge 100 cannot be inserted into the first predetermined amount unless the cover member 200 and the drum cartridge 100 are unlocked. For this reason, the cover member 200 and the apparatus main body 1a are not locked. In any case, when a failure occurs in the unit lock mechanism 500, the cover member 200 can be prevented from being inadvertently locked to the apparatus main body 1a, and can be removed from the apparatus main body 1a.

  In the present embodiment, the main body lock mechanism 600 and the unit lock mechanism 500 have a common configuration as a mechanism. For this reason, the number of parts can be reduced as compared with the case where these mechanisms are configured differently. In addition, as described above, the main body lock mechanism 600 and the unit lock mechanism 500 perform locking and unlocking in conjunction with the setting of the cover member 200 and the drum cartridge 100 to the insertion position and the insertion operation of the drum cartridge 100, respectively. Do. That is, in the present embodiment, the lock mechanism is locked and unlocked only by setting and inserting the drum cartridge 100 into the apparatus main body 1a. For this reason, the mounting operation of the apparatus main body 1a of the drum cartridge 100 can be easily performed without performing an operation only for locking and unlocking each locking mechanism.

In the above description, the main body lock mechanism 600 and the unit lock mechanism 500 have a common configuration, but these may be different configurations. In addition, each lock mechanism is locked and unlocked by swinging the swing plate 210, but another configuration, for example, a moving member that slides instead of the swing plate may be used. good. That is, the moving member may be slid up and down along the engaging recess 105, the lock guide portion 104, and the lock release guide portion 106.

<Second Embodiment>
A second embodiment of the present invention will be described with reference to FIGS. In the case of the present embodiment, the cover member 700 that covers the drum cartridge 100 and the configuration of locking and unlocking the apparatus main body 1b are different from those of the first embodiment. For this reason, the description and illustration overlapping with the first embodiment will be omitted or simplified below, and the description will focus on parts that are different from the first embodiment.

[Cover member]
As shown in FIGS. 17A and 17B, the cover member 700 includes a lid portion 710 at the upper portion and a housing portion 720 at the lower portion, and the lid portion 710 is provided to be openable and closable with respect to the housing portion 720. ing. A delivery port 740 for delivering the drum cartridge 100 from the cover member 700 to the apparatus main body 1b is provided at the distal end side in the insertion direction of the cover member 700. The outer periphery of the delivery port 740 serves as a fitting portion 750 into which the cover member 700 is fitted into an opening portion 800 (inserted portion, FIG. 23A) that is a receiving port of the drum cartridge 100 of the apparatus main body 1b. Further, an engaging portion 760 that engages with the protruding portion 810 (FIG. 29A) of the apparatus main body 1 b is provided on the upper portion of the fitting portion 750.

  In the present embodiment, the cover portion 710 and the housing portion 720 of the cover member 700 are formed of an integral resin, and the material is made of a resin such as black polypropylene, for example. As shown in FIG. 18A, the lid 710 can be opened and closed with respect to the accommodating portion 720 by a living hinge 730. Further, as shown in FIG. 18B, a light is not directly applied to the inside of the cover member 700 by providing a 711 in the vicinity of the gap when the lid 710 is closed with respect to the housing 720. I have to.

  As shown in FIGS. 19A and 19B, the lid portion 710 is provided with a snap fit 712 and a hook 713, and when the lid portion 710 is closed, the lid portion 710 is engaged with the accommodating portion 720, respectively. . As a result, the lid portion 710 is locked to the accommodating portion 720. As shown in FIG. 20A, the hook 713 can enter the inside through an opening 721 formed in the housing portion 720 while being elastically deformed. Then, the hook 713 is engaged with the periphery of the opening 721, so that the lid 710 is locked in the closed state in the housing 720. The hook 713 cannot be removed unless the lid portion 710 moves relative to the housing portion 720 to the back side (arrow R direction, insertion direction front side, right side in FIG. 19B).

  Further, as shown in FIG. 20B, the snap fit 712 can enter the inside through an opening 722 formed in the housing portion 720 while being elastically deformed. Then, the snap fit 712 engages with the periphery of the opening 722, so that the lid 710 is locked in the closed state in the housing portion 720. When snap fit 712 receives a force on the front side (arrow F direction, insertion direction rear side, left side in FIG. 19B) with respect to housing portion 720, it bends and disengages from the periphery of opening 722. It is possible.

  In the present embodiment, when the lid portion 710 is closed, the snap fit 712 and the hook 713 are all hooked on a part of the accommodating portion 220, and the lid portion 710 is not easily opened. On the other hand, in the state where the snap fit 712 is deflected by applying a force in the direction of arrow F and is detached from the accommodating portion 220, when the lid portion 710 is opened, the lid portion 710 is inclined because only the back side is opened. In this state, the hook 713 also moves in the direction of the arrow R, and the lid 710 can be opened in the raised state.

[Mounting the drum cartridge to the cover member]
As shown in FIGS. 21 and 22, the drum cartridge 100 is mounted on the cover member 700 configured as described above. Specifically, the drum cartridge 100 is disposed in the housing portion 720 with the lid portion 710 opened, and the lid portion 710 is shown. As a result, the drum cartridge 100 is housed in the cover member 700, and the drum cartridge 100 is covered by the cover member 700. Further, in this state, the end cover member 770 is fitted into a fitting portion 750 provided on the distal end side (right side in FIG. 21) of the cover member 700 in the insertion direction.

  The end cover member 770 is formed of, for example, a foam material, and is coupled to the engagement portion 760 of the cover member 700 by the elasticity of the foam material. As a result, the delivery port 740 is covered with the end cover member 770, and the entire drum cartridge 100 is covered with the cover member 700 and the end cover member 770. Further, as shown in FIG. 22, a stopper portion 714 is provided on the rear end side in the insertion direction of the lid portion 710. Then, with the lid portion 710 closed, the stopper portion 714 is brought into contact with the end surface on the distal end side in the insertion direction of the protruding portion 110 protruding upward at the rear end portion in the insertion direction of the drum cartridge 100. Thereby, it is possible to prevent the drum cartridge 100 from moving toward the distal end side in the insertion direction within the cover member 700. Therefore, even if the end cover member 770 is not present, the drum cartridge 100 does not jump out of the delivery port 740 of the cover member 700.

  As shown in FIG. 28A described later, a part of the drum cartridge 100 comes into contact with the engaging portion 760 and elastically pushes the engaging portion 760 apart. In this state, the drum cartridge 100 is housed protected by the cover member 700 and the end cover member 770. As a physical distribution packing form of the drum cartridge 100, the cover member 700 may be packed together with a cushioning member such as a foaming material, a protective bag, a cardboard box, and the like as in the conventional case.

[Drum cartridge replacement]
Next, replacement of the drum cartridge 100 of this embodiment will be described. In the present embodiment, as in the first embodiment, the replacement of the cyan (third from the left in FIG. 23A) drum cartridge 100 will be described, but the same applies to drum cartridges of other colors. As in the first embodiment, the drum cartridge 100 to be replaced is extracted from the apparatus main body 1b (FIG. 23A). Then, as shown in FIG. 23B, the new drum cartridge 100 covered by the cover member 700 is inserted into the insertion position of the apparatus main body 1b.

  At this time, as shown in FIGS. 24A to 24C, the end cover member 770 is removed from the cover member 700. Here, as described with reference to FIG. 22, the stopper portion 714 of the cover member 700 is in contact with the protruding portion 110 of the drum cartridge 100. For this reason, even if the end cover member 770 is removed, the drum cartridge 100 does not fall off the cover member 700 until the end cover member 770 is positioned on the apparatus main body 1a.

  Then, the drum cartridge 100 covered by the cover member 700 is inserted into the insertion position of the apparatus main body 1b. At this time, as shown in FIG. 25, the fitting portion 750 of the cover member 700 is fitted into the opening 800 of the apparatus main body 1b. Since the end cover member 770 is larger than the opening 800, the cover member 700 cannot be inserted into the opening 800 with the end cover member 770 attached.

  Further, the opening 800 serving as a support portion allows the cover member 700 and the drum cartridge 100 to be inserted into the apparatus main body 1b in a state where a predetermined amount of the drum cartridge 100 covered by the cover member 700 is inserted toward the insertion position of the apparatus main body 1b. To support. That is, as shown in FIG. 25, the fitting portion 750 of the cover member 700 is fitted to the opening 800 of the apparatus main body 1b without rattling, and the fitting width Y is set to 50 mm, for example. Thereby, the drum cartridge 100 covered with the cover member 700 is supported with respect to the apparatus main body 1b. That is, even if the operator releases his / her hands from the cover member 700 and the drum cartridge 100, they will not fall out of the apparatus main body 1b. In the present embodiment, this position is the insertion position of the drum cartridge 100 with respect to the apparatus main body 1b.

  Further, as shown in FIG. 26, a protrusion 801 is formed on a part of the front side (left side in FIG. 26) of the apparatus main body 1b on the upper side of the opening 800 so as to protrude to the front side. Yes. On the other hand, an opening 723 is formed in a part of the housing portion 720 of the cover member 700 at a portion facing the snap fit 712 of the lid portion 710. Then, in a state where the cover member 700 and the drum cartridge 100 are set at the insertion position of the apparatus main body 1b, the protrusion 801 pushes the snap fit 712 through the opening 723 in the arrow F direction. Thereby, the engagement of the snap fit 712 is released. Thereby, as described above, the lid portion 710 of the cover member 700 can be opened.

  Next, as shown in FIG. 27A, the lid 710 is opened. As a result, the operator can access the drum cartridge 100. At this time, the engagement between the stopper portion 714 and the protruding portion 110 described with reference to FIG. 22 is disengaged, and the drum cartridge 100 can be moved in the insertion direction of the apparatus main body 1b with respect to the cover member 700. In this state, as shown in FIG. 27B, the drum cartridge 100 is inserted toward a predetermined mounting position of the apparatus main body 1b. At this time, the drum cartridge 100 is guided to be inserted into the cover member 700. Specifically, as shown in FIG. 21, the drum cartridge 100 is placed on the bottom portion 701 of the cover member 700 and is guided along the bottom portion 701 as a guide portion. Further, since the operator can visually recognize both the drum cartridge 100 and the cover member 700, the drum cartridge 100 can be easily inserted. Further, by opening the lid portion 710 after restricting the position of the apparatus main body 1b to the insertion position, it is possible to prevent the photosensitive drum 11 from being exposed or damaged until just before the drum cartridge 100 is inserted.

[Main body lock mechanism]
Next, a main body locking mechanism 900 that locks and unlocks the cover member 700 and the apparatus main body 1b in this embodiment will be described with reference to FIGS. The main body lock mechanism 900 of this embodiment includes an engaging portion 760 and a protruding portion 810 as an engaged portion. The engaging portion 760 is provided on the cover member 700, and the protruding portion 810 is provided on the apparatus main body 1 b and is freely engageable with the engaging portion 760. A pair of protrusions 810 is formed on the upper surface of the surface of the opening 800 of the apparatus main body 1b where the fitting portion 750 of the cover member 700 is fitted so as to protrude downward. When the first predetermined amount of drum cartridge 100 is inserted from the insertion position, the engaging portion 760 and the protruding portion 810 are engaged, and the apparatus main body 1b and the cover member 700 are locked. On the other hand, when the drum cartridge 100 is inserted by a second predetermined amount from the insertion position, the engagement between the engagement portion 760 and the projection 810 is released, and the lock between the apparatus main body 1b and the cover member 700 is released.

  More specifically, the main body lock mechanism 900 further includes an elastic deformation portion 761, a protruding portion 120 as a first engaging portion, and a protruding portion 110 as a second engaging portion. The elastic deformation portion 761 is provided with an engagement portion 760 at the tip, and the engagement portion 760 and the projection portion 810 can be engaged and released by elastic deformation. In this embodiment, notches 762 are formed at two locations on the upper surface of the fitting portion 750, and the elastic deformation portions 761 are formed so as to protrude from the back of each notch 762 toward the front. Yes. The elastic deformation portion 761 is formed of resin integrally with the cover member 700 and can be elastically deformed in the notch 762. Further, an engaging portion 760 that protrudes toward each other is provided at each tip portion of the pair of elastic deformation portions 761. Therefore, the pair of engaging portions 760 approaches or separates when the elastic deformation portion 761 is elastically deformed.

  The protruding portion 120 as the first engaging portion is provided so as to protrude upward at the distal end portion in the insertion direction of the drum cartridge 100. 28A, the protrusion 120 is engaged with the elastic deformation portion 761 in a state where the drum cartridge 100 is disposed on the cover member 700 and is not moved in the insertion direction with respect to the cover member 700. Then, the pair of elastic deformation portions 761 are elastically deformed and spread. Further, the length of the protruding portion 120 in the insertion direction moves relative to the cover member 700 to a position where the drum cartridge 100 does not include the position where the first predetermined amount is between the insertion position and the first predetermined amount. At this time, the elastic deformation portion 761 is engaged. For this reason, in this range, a pair of elastic deformation part 761 is pushed and extended by the protrusion part 120, and as shown to Fig.29 (a), the engaging part 760 and the projection part 810 do not engage.

  The protruding portion 110 as the second engaging portion is provided to protrude upward at the rear end portion in the insertion direction of the drum cartridge 100. Then, as shown in FIG. 28C, when the drum cartridge 100 moves relative to the cover member 700 from the insertion position to the second predetermined amount, the protrusion 110 engages with the elastic deformation portion 761. Then, the pair of elastic deformation portions 761 are elastically deformed and spread. Even in this state, as shown in FIG. 29A, the engaging portion 760 and the protruding portion 810 are not engaged.

  With respect to the insertion direction of the drum cartridge 100, no protrusion or the like that engages with the elastic deformation portion 761 is provided between the protrusion 110 and the protrusion 120. Therefore, the elastic deformation portion 761 does not elastically deform when not engaged with the protrusion 110 and the protrusion 120, and engages the engagement portion 760 with the protrusion 810 as shown in FIG. Position it as possible.

  In the case of this embodiment having such a main body locking mechanism 900, in a state where the drum cartridge 100 covered by the cover member 700 is set at the insertion position shown in FIG. 23, the cover member 700 is attached to the apparatus main body 1b. Is not locked. That is, in a state where the drum cartridge 100 is not inserted, as shown in FIG. 28A, the protrusion 120 pushes the elastic deformation portion 761, and the engagement portion 760 of the cover member 700 is connected to the apparatus main body 1b. It does not engage with the protrusion 810. For this reason, in this state, the cover member 700 and the drum cartridge 100 can still be removed from the apparatus main body 1b.

  In this state, when the first predetermined amount of the drum cartridge 100 is inserted from the insertion position, the engagement between the protruding portion 120 and the elastic deformation portion 761 is released as shown in FIG. Is restored elastically. As a result, as shown in FIG. 29B, the engaging portion 760 and the protruding portion 810 are engaged, and the cover member 700 is locked with respect to the apparatus main body 1b, and the cover member 700 cannot be pulled out.

  In addition, when the drum cartridge 100 inserted more than the first predetermined amount from the insertion position is returned to the insertion position, the lock between the apparatus main body 1b and the cover member 700 is released. That is, when the drum cartridge 100 is returned to the insertion position, as shown in FIG. 28A, the projecting portion 120 spreads the elastic deformation portion 761, and the engagement portion 760 and the projection portion 810 are engaged. The device main body 1b and the cover member 700 are unlocked. Therefore, if the drum cartridge 100 is returned to the insertion position, the cover member 700 and the drum cartridge 100 can be detached from the apparatus main body 1b.

  Further, when the drum cartridge 100 is inserted by a second predetermined amount from the insertion position, the projecting portion 110 and the elastic deforming portion 761 are engaged with each other as shown in FIG. It is pushed out. As a result, as shown in FIG. 29A, the engagement portion 760 and the projection 810 are disengaged, the lock between the cover member 700 and the apparatus main body 1b is released, and the cover member 700 can be pulled out. a.

  As shown in FIG. 30A, in a state where the drum cartridge 100 is pushed to a predetermined position, the cover member 700 is removed from the apparatus main body 1b (FIG. 30B), and then the front cover 400 is closed, whereby the drum The replacement operation of the cartridge 100 is completed.

  In the case of this embodiment as well, as in the first embodiment, the drum cartridge 100 can be removed in a state where the drum cartridge 100 is set at the insertion position of the apparatus main body 1b. When the first predetermined amount of drum cartridge 100 is inserted from the insertion position, apparatus main body 1b and cover member 700 are locked. Further, the lock between the cover member 700 and the apparatus main body 1b cannot be released until the drum cartridge 100 is inserted into the second predetermined amount. Therefore, the cover member 700 is not inadvertently detached from the apparatus main body 1b when the drum cartridge 100 is inserted, and the drum cartridge 100 can be mounted up to a predetermined mounting position while being guided by the cover member 700.

  In the case of this embodiment, a mechanism for locking and unlocking the drum cartridge 100 and the cover member 700 is not provided, but it may be provided similarly to the first embodiment. Other configurations and operations are the same as those in the first embodiment.

<Other embodiments>
In each of the above-described embodiments, the case where the drum cartridge 100 is applied as a unit that can be inserted into and removed from the apparatus main body has been described. However, the unit of the present invention may be another unit. For example, a charging unit having only a charging function, a developing unit having only development, a cleaner unit having only a cleaner function, a transfer unit having a transfer function, a fixing unit having a fixing function, etc. . In the case of the charging unit, the image forming member for forming an image is, for example, the charging roller 12. Similarly, in the case of the developing unit, the image forming member is, for example, the developing sleeve 14a. In the case of the cleaner unit, the image forming member is, for example, the cleaning blade 15. In the case of the transfer unit, the image forming member is, for example, the intermediate transfer belt 61. In the case of the fixing unit, the image forming member is, for example, a heating roller 41 and a pressure roller 42. The unit of the present invention may be a process cartridge in which the drum cartridge 100 and the developing device 14 are combined.

  Here, when these various units are applied to the tandem type image forming apparatus described above, a plurality of units are arranged side by side. In this case, the units may have a common configuration. In this case, if the configuration is the same except for the toner color, such as the developing unit and the process cartridge, the unit may be placed in the wrong color position. Even in such a case, the present invention can be detached from the apparatus main body only by setting the unit at the insertion position.

  DESCRIPTION OF SYMBOLS 1 ... Image forming apparatus / 1a, 1b ... Main body / 11 ... Photosensitive drum (Image formation means) / 100 ... Drum cartridge (Cartridge body) / 102 ... Rib (guide part) / 103 ... Guide (guide part) / 104 ... Lock guide part(Rock Guy Department)/ 105 ...Engaging recess/ 106 ... Unlocking guide part / 110 ... Projection part (second engagement part) / 120 ... Projection part (first engagement part) / 200, 700 ... Cover member / 202a ... Drum guide (guide portion) / 203a ... holding rib (guide portion) / 210 ... swing plate (Lock member) / 211 ... projection / 212,760 ... engagement / 301 ... support / 305 ... projection (engaged) / 500 ... unit lock mechanism (unit lock means) ) / 600, 900... Main body locking mechanism (main body locking means) / 701... Bottom portion (guide portion) / 761... Elastic deformation portion / 800. Projection (engaged part)

Claims (1)

The device body;
A unit that can be inserted into and removed from the apparatus main body and has an image forming member for image formation;
A cover member for guiding the unit when the unit is inserted into the apparatus main body, and covering the image forming member;
When the first predetermined amount is inserted from the insertion position into the apparatus main body, the apparatus main body and the cover member are locked, and the unit is moved from the insertion position to the second predetermined amount larger than the first predetermined amount. A main body locking means for releasing the lock between the apparatus main body and the cover member when inserted by a predetermined amount,
An image forming apparatus.

Images