Image forming device

Abstract

To provide an image forming apparatus that can prevent a reduction in the accuracy of positioning of photoconductor drums in a main body housing.SOLUTION: An image forming apparatus 1 comprises a drum cartridge 5Y, a toner cartridge 6Y, and a drawer 4. The drawer 4 includes a lock member 43Y. In a state in which the drum cartridge 5Y is attached to the drawer 4, the lock member 43Y is movable between a locking position and a lock release position. In a state in which the lock member 43Y is located at the locking position, the lock member 43Y locks a photoconductor drum 11Y to the drawer 4. In a state in which the lock member 43Y is located at the lock release position, the lock member 43Y releases the lock of the photoconductor drum 11Y to the drawer 4.SELECTED DRAWING: Figure 9

Description

[Technical field]

[0001] The present disclosure relates to an image forming apparatus. [Background technology]

[0002] 2. Description of the Related Art Conventionally, there has been known an image forming apparatus in which a toner cartridge is detachably attached to a drawer having a photosensitive drum (see Patent Document 1 below). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2011-075887 A Summary of the Invention [Problem to be solved by the invention]

[0004] In an image forming apparatus such as that described in Patent Document 1, it may be desirable to configure the drum unit having the photosensitive drum so as to be detachable from the drawer, and the toner cartridge so as to be detachable from the drum unit. In this case, when an operator attaches or detaches the toner cartridge to or from the drum unit attached to the drawer, the drum unit may move relative to the drawer. If the drum unit moves relative to the drawer, the positioning accuracy of the photosensitive drum within the main body housing may decrease.

[0005] In view of the above, an object of the present disclosure is to provide an image forming apparatus capable of suppressing a decrease in the positioning accuracy of a photosensitive drum within a main body housing. [Means for solving the problem]

[0006] (1) The image forming apparatus of the present disclosure includes a main body housing, a drum cartridge, a toner cartridge, and a drawer. The drum cartridge includes a photosensitive drum. The toner cartridge is detachably attached to the drum cartridge. The drawer is movable between an inner position and an outer position. When the drawer is located at the inner position, the drawer is located inside the main body housing. When the drawer is located at the outer position, the drawer is located outside the main body housing. The drum cartridge is detachably attached to the drawer.

[0007] The drawer includes a locking member. When the drum cartridge is attached to the drawer, the locking member is movable between a locked position and an unlocked position. When the locking member is located at the locked position, the locking member locks the photosensitive drum to the drawer. When the locking member is located at the unlocked position, the locking member releases the lock of the photosensitive drum from the drawer.

[0008] According to this configuration, when replacing the toner cartridge with the drum cartridge attached to the drawer, the toner cartridge can be replaced with respect to the drum cartridge with the photosensitive drum locked in the drawer by the locking member.

[0009] Therefore, the photosensitive drum can be prevented from moving relative to the drawer during the replacement of the toner cartridge.

[0010] As a result, it is possible to suppress a decrease in the positioning accuracy of the photosensitive drum within the main body housing.

[0011] (2) The photosensitive drum is rotatable about a drum shaft. The drum shaft extends in the axial direction. The locking member may be rotatable about a first shaft between a locked position and an unlocked position. The first shaft may extend in the axial direction.

[0012] According to this configuration, when the locking member is moved between the locked position and the unlocked position, it is not necessary to move the locking member in the axial direction.

[0013] Therefore, it is possible to save space in the axial direction.

[0014] (3) The locking member may be rotatable about the drum shaft between a locked position and an unlocked position.

[0015] According to this configuration, the range of movement of the locking member relative to the photosensitive drum can be reduced.

[0016] Therefore, it is possible to prevent the drawer from becoming large due to the provision of the locking member.

[0017] (4) The locking member may have a disk shape. The locking member may have a lock guide and a through hole. The locking guide extends in a radial direction of the locking member. The through hole is located in the center of the locking member. The through hole is circular. The through hole is located within the locking guide.

[0018] (5) The drawer may have a drawer guide. When the drum cartridge is attached to the drawer, the drawer guide guides one end of the photosensitive drum in the axial direction of the photosensitive drum. The locking member may have a lock guide. When the drum cartridge is attached to the drawer, one end of the photosensitive drum fits into the lock guide. When the locking member is in the locked position, the lock guide extends in a direction intersecting the extension direction of the drawer guide. When the locking member is in the unlocked position, the lock guide extends in the extension direction of the drawer guide and is connected to the drawer guide.

[0019] With this configuration, when the drum cartridge is attached to the drawer with the locking member in the unlocked position, one end of the photosensitive drum in the axial direction can be guided by the drawer guide and the locking guide, allowing it to be smoothly fitted into the locking member.

[0020] Furthermore, when the drum cartridge is attached to the drawer and the locking member is in the locked position, one end of the photosensitive drum in the axial direction can be locked to the drawer by the locking guide.

[0021] (6) The locking member may have a locking portion. When the locking member is in the locked position, the locking portion locks the photosensitive drum to the drawer. When the drum cartridge is installed in the drawer and the locking member is in the locked position, the locking portion is located between one end of the photosensitive drum and the drawer guide. When the drum cartridge is installed in the drawer and the locking member is in the unlocked position, the locking portion retracts from between one end of the photosensitive drum and the drawer guide.

[0022] According to this configuration, when the drum cartridge is attached to the drawer and the locking member is in the locked position, one end of the photosensitive drum in the axial direction can be locked to the drawer by the locking portion.

[0023] (7) The drawer may have a positioning plate. When the drum cartridge is installed in the drawer, the positioning plate comes into contact with one end of the photosensitive drum to determine the position of the photosensitive drum. The locking member may have a pressing member. When the drum cartridge is installed in the drawer, the pressing member presses one end of the photosensitive drum toward the positioning plate.

[0024] According to this configuration, the locking member can be used to press one end of the photosensitive drum against the positioning plate.

[0025] (8) The locking member may have a spring. When the drum cartridge is attached to the drawer, the spring presses the pressing member toward one end of the photosensitive drum.

[0026] (9) The positioning plate may have a recess. When the drum cartridge is attached to the drawer, one end of the photosensitive drum fits into the recess. When the drum cartridge is attached to the drawer, the pressing member may press the one end of the photosensitive drum toward the recess of the positioning plate.

[0027] (10) The main body housing has a positioning member. When the drawer is located at the inner position, the positioning member positions the positioning plate on the main body housing. The positioning plate has a positioned portion. When the drawer is located at the inner position, the positioned portion comes into contact with the positioning member.

[0028] (11) The positioning member may have a cylindrical shape. The positioned portion may be a notch. When the drawer is located at the inner position, the positioning member fits into the notch.

[0029] (12) The drawer may further include a lever that moves the locking member between a locked position and an unlocked position. The lever is movable together with the locking member.

[0030] (13) The drawer may have a side plate. The side plate may have an inner surface, an outer surface, and a through hole. When the drum cartridge is attached to the drawer, the inner surface faces the drum cartridge. When the drum cartridge is attached to the drawer, the outer surface is located on the opposite side of the drum cartridge from the inner surface. The through hole passes from the inner surface to the outer surface. The locking member may be located within the through hole of the side plate. The lever may be located outside the outer surface of the side plate.

[0031] With this configuration, an operator can operate the locking member from outside the side plate.

[0032] Therefore, the operator can move the locking member smoothly.

[0033] (14) When the locking member is in the locked position, the lever may be movable between a first position and a second position. When the lever is in the first position, the lever extends along an outer surface of the side plate. When the lever is in the second position, the lever protrudes from the outer surface of the side plate. When the locking member is in the locked position and the lever is in the first position, the lever is locked with respect to the side plate. When the locking member is in the locked position and the lever is in the second position, the lever is unlocked with respect to the side plate.

[0034] With this configuration, the locking member can be locked in the locked position by using the lever.

[0035] (15) The lever may have a protrusion. The side plate may have a hole. When the locking member is in the locked position and the lever is in the first position, the protrusion of the lever fits into the hole in the side plate, thereby locking the lever to the side plate. When the locking member is in the locked position and the lever is in the second position, the protrusion of the lever comes out of the hole in the side plate, thereby unlocking the lever from the side plate.

[0036] (16) The main housing may have an abutment portion. When the drawer is moved from the outer position to the inner position while the lever is in the second position, the lever abuts against the abutment portion.

[0037] According to this configuration, it is possible to prevent the drawer from being positioned at the inner position when the lever is in the second position.

[0038] Therefore, when an operator moves the drawer from the outer position to the inner position, the operator can be prompted to place the lock member in the lock position and the lever in the first position.

[0039] (17) The photosensitive drum may have a coupling. The coupling is located at one end of the photosensitive drum. The locking member may have a through hole. When the drum cartridge is attached to the drawer, the coupling is exposed from the through hole. When the drum cartridge is attached to the drawer and the lever is located at the second position, the lever may cover at least a portion of the coupling in the axial direction of the photosensitive drum.

[0040] According to this configuration, when the drawer is positioned at the inner position with the lever positioned at the second position, the main body coupling can be prevented from fitting into the coupling by the lever.

[0041] Therefore, it is possible to prevent image formation from being started in a state in which the photosensitive drum is not locked in the drawer.

[0042] (18) When the drum cartridge is installed in the drawer and the lever is in the second position, the lever may extend in a radial direction of the photosensitive drum. The lever has a first end and a second end in the direction in which the lever extends. The second end may be located on the opposite side of the through hole from the first end.

[0043] (19) When the toner cartridge is attached to the drum cartridge, the toner cartridge may be rotatable about a second axis between a cartridge first position and a cartridge second position. When the toner cartridge is located in the cartridge first position, the toner cartridge is locked to the drum cartridge. When the toner cartridge is located in the cartridge second position, the lock of the toner cartridge to the drum cartridge is released. The second axis may extend in the axial direction of the photosensitive drum. Effect of the Invention

[0044] According to the image forming apparatus of the present disclosure, it is possible to suppress a decrease in the positioning accuracy of the photosensitive drum within the main body housing. [Brief description of the drawings]

[0045] [Figure 1] FIG. 1 is a schematic diagram of an image forming apparatus. [Diagram 2] FIG. 2 is an explanatory diagram for explaining the movement of the drawer shown in FIG. 1, showing a state in which the cover is in the cover open position and the drawer is in the outer position. [Diagram 3] FIG. 3 is a perspective view of the drum cartridge, showing a state in which the toner shutter of the drum cartridge is located at the closed position. [Figure 4] FIG. 4 is a perspective view of the drum cartridge shown in FIG. 3, showing a state in which the toner shutter of the drum cartridge is located at the open position. [Diagram 5] FIG. 5 is a cross-sectional view of the drum cartridge shown in FIG. 3, passing through the toner receiving opening. [Figure 6] 6 is a cross-sectional view of the drawer and the drum cartridge shown in FIG. 2 taken along line AA. [Figure 7] FIG. 7 is a side view of the drawer shown in FIG. [Figure 8] FIG. 8 is a cross-sectional view of the drawer taken at the center in the axial direction. [Figure 9] FIG. 9 is a cross-sectional view of the drawer shown in FIG. 6, taken along a line passing through the drawer guide and the lock guide. [Figure 10] FIG. 10 is a cross-sectional view of the drawer shown in FIG. 9, showing the locking member in the unlocked position. [Figure 11] FIG. 11 is a side view of the drawer shown in FIG. 7, showing the locking member in the unlocked position. [Figure 12] FIG. 12 is a perspective view of the toner cartridge, showing a state in which the toner shutter of the toner cartridge is located at the closed position. [Figure 13] FIG. 13 shows a state in which the toner cartridge is attached to the drum cartridge and is located at the cartridge first position. [Figure 14]FIG. 14 shows a state in which the toner cartridge is attached to the drum cartridge and located at the cartridge second position. [Figure 15] FIG. 15 is a perspective view of the toner cartridge shown in FIG. 12, showing a state in which the toner shutter of the toner cartridge is located at the open position. [Figure 16] FIG. 16 is a cross-sectional view of the toner cartridge shown in FIG. 12, passing through the toner discharge port. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0046] 1. Image forming device 1 An outline of an image forming apparatus 1 will be described with reference to FIGS.

[0047] As shown in FIG. 1, the image forming apparatus 1 includes a main body housing 2, a sheet cassette 3, a drawer 4, multiple drum cartridges 5Y, 5M, 5C, and 5K, multiple toner cartridges 6Y, 6M, 6C, and 6K, an exposure device 7, a belt unit 8, a transfer roller 9, and a fixing device 10.

[0048] 1.1 Main unit 2 The main body housing 2 accommodates a sheet cassette 3, a drawer 4, drum cartridges 5Y, 5M, 5C, and 5K, toner cartridges 6Y, 6M, 6C, and 6K, an exposure device 7, a belt unit 8, a transfer roller 9, and a fixing device 10. The main body housing 2 has an opening 21, a cover 22, and a positioning member 23.

[0049] The opening 21 is located on one side wall of the main body housing 2 in the first direction.

[0050] The cover 22 is movable between a cover closed position (see FIG. 1) and a cover open position (see FIG. 2). As shown in FIG. 1, when the cover 22 is located at the cover closed position, the cover 22 closes the opening 21. As shown in FIG. 2, when the cover 22 is located at the cover open position, the opening 21 is open.

[0051] The positioning member 23 extends in the axial direction. The axial direction will be described later. The positioning member 23 has a cylindrical shape. The positioning member 23 is made of a metal such as stainless steel or iron.

[0052] 1.2 Sheet cassette 3 1, the sheet cassette 3 is capable of housing a sheet S. The sheet S in the sheet cassette 3 is transported toward a transfer roller 9.

[0053] 1.3 Drawer 4 As shown in Fig. 2, when the cover 22 is in the cover open position, the drawer 4 is movable in a first direction between an inner position (see Fig. 1) and an outer position (see Fig. 2) through the opening 21. As shown in Fig. 1, when the drawer 4 is in the inner position, the entirety of the drawer 4 is located inside the main body housing 2. As shown in Fig. 2, when the drawer 4 is in the outer position, at least a part of the drawer 4 is located outside the main body housing 2.

[0054] 1.4 Drum cartridges 5Y, 5M, 5C, 5K Each of the drum cartridges 5Y, 5M, 5C, and 5K can be attached to and detached from the drawer 4. More specifically, each of the drum cartridges 5Y, 5M, 5C, and 5K can be attached to and detached from the drawer 4 when the drawer 4 is in the outer position.

[0055] The drum cartridges 5M, 5C, and 5K will be described in the same manner as the drum cartridge 5Y, and therefore, in the following description, the description of the drum cartridges 5M, 5C, and 5K will be omitted.

[0056] As shown in FIG. 1, the drum cartridge 5Y includes a photosensitive drum 11Y, a charging device 12Y, and a developing device 13Y.

[0057] 1.4.1 Photosensitive drum 11Y The photosensitive drum 11Y extends in an axial direction. When the drum cartridge 5Y is attached to the drawer 4, the axial direction intersects with the first direction. Preferably, when the drum cartridge 5Y is attached to the drawer 4, the axial direction is perpendicular to the first direction. The photosensitive drum 11Y is rotatable about a drum axis A1. The drum axis A1 extends in the axial direction. As shown in FIG. 3, the photosensitive drum 11Y has a coupling 111Y.

[0058] The coupling 111Y is located at one end of the photosensitive drum 11Y in the axial direction. The coupling 111Y rotates together with the photosensitive drum 11Y. When the drum cartridge 5Y is attached to the drawer 4 and the drawer 4 is located at the inner position, a main body coupling (not shown) fits into the coupling 111Y. The coupling 111Y rotates by receiving power from a main body coupling (not shown).

[0059] 1.4.2 Charging device 12Y 1, the charging device 12Y charges the peripheral surface of the photosensitive drum 11Y. In this embodiment, the charging device 12Y is a charging roller. The charging device 12Y may be a scorotron type charger.

[0060] 1.4.3 Developing unit 13Y The developing device 13Y is capable of supplying toner to the photosensitive drum 11Y. In more detail, the developing device 13Y includes a developing housing 131Y and a developing roller 132Y.

[0061] 1.4.3.1 Developer housing 131Y The developing housing 131Y can accommodate the toner from the toner cartridge 6Y. The developing housing 131Y has a developing opening 133. The toner from the toner cartridge 6Y passes through the developing opening 133 and enters the developing housing 131Y. The developing housing 131Y supports a developing roller 132Y.

[0062] 1.4.3.2 Developing roller 132Y The developing roller 132Y can supply toner in the developing housing 131Y to the photosensitive drum 11Y. The developing roller 132Y contacts the photosensitive drum 11Y. The developing roller 132Y may be separable from the photosensitive drum 11Y. The developing roller 132Y extends in the axial direction. The developing roller 132Y can rotate about a developing shaft A2. The developing shaft A2 extends in the axial direction.

[0063] 1.6 Multiple Toner Cartridges 6Y, 6M, 6C, 6K The toner cartridge 6Y contains toner to be supplied to the photosensitive drum 11Y. The toner cartridge 6Y is detachable from the drum cartridge 5Y. When the toner cartridge 6Y is attached to the drum cartridge 5Y, the toner cartridge 6Y can supply toner to the developing device 13Y.

[0064] The toner cartridge 6M contains toner to be supplied to the photosensitive drum 11M. The toner cartridge 6M is detachable from the drum cartridge 5M. When the toner cartridge 6M is attached to the drum cartridge 5M, the toner cartridge 6M can supply toner to the developing device 13M.

[0065] The toner cartridge 6C contains toner to be supplied to the photosensitive drum 11C. The toner cartridge 6C is detachable from the drum cartridge 5C. When the toner cartridge 6C is attached to the drum cartridge 5C, the toner cartridge 6C can supply toner to the developing device 13C.

[0066] The toner cartridge 6K contains toner to be supplied to the photosensitive drum 11K. The toner cartridge 6K is detachable from the drum cartridge 5K. When the toner cartridge 6K is attached to the drum cartridge 5K, the toner cartridge 6K can supply toner to the developing device 13K.

[0067] 1.7 Exposure equipment 7 When the drum cartridges 5Y, 5M, 5C, and 5K are attached to the drawer 4 and the drawer 4 is located in the inner position, the exposure device 7 can expose the peripheral surfaces of the photosensitive drums 11Y, 11M, 11C, and 11K to light. In this embodiment, the exposure device 7 is a laser scan unit.

[0068] 1.8 Belt Unit 8 When the drum cartridges 5Y, 5M, 5C, and 5K are attached to the drawer 4 and the drawer 4 is located in the inner position, the belt unit 8 is located below the drum cartridges 5Y, 5M, 5C, and 5K. The belt unit 8 includes an intermediate transfer belt 81 and a plurality of transfer rollers 82Y, 82M, 82C, and 82K.

[0069] When the drum cartridges 5Y, 5M, 5C, and 5K are attached to the drawer 4 and the drawer 4 is located at the inner position, the intermediate transfer belt 81 contacts the photosensitive drums 11Y, 11M, 11C, and 11K.

[0070] The transfer roller 82Y transfers the toner on the photosensitive drum 11Y to the intermediate transfer belt 81. The transfer roller 82M transfers the toner on the photosensitive drum 11M to the intermediate transfer belt 81. The transfer roller 82C transfers the toner on the photosensitive drum 11C to the intermediate transfer belt 81. The transfer roller 82K transfers the toner on the photosensitive drum 11K to the intermediate transfer belt 81.

[0071] 1.9 Transfer roller 9 The transfer roller 9 transfers the toner on the intermediate transfer belt 81 onto the sheet S. More specifically, the sheet S transported from the sheet cassette 3 toward the transfer roller 9 passes between the transfer roller 9 and the intermediate transfer belt 81 and is transported to the fixing device 10. At this time, the transfer roller 9 transfers the toner on the intermediate transfer belt 81 onto the sheet S.

[0072] 1.10 Fixing device 10 The fixing device 10 applies heat and pressure to the sheet S onto which the toner has been transferred, thereby fixing the toner to the sheet S. The sheet S that has passed through the fixing device 10 is discharged onto the top surface of the main body housing 2.

[0073] 2. Details of the 5Y drum cartridge Next, the drum cartridge 5Y will be described in detail with reference to FIGS.

[0074] In addition, the "first direction" in the following description of the drum cartridge 5Y refers to the "first direction" in a state in which the drum cartridge 5Y is attached to the drawer 4.

[0075] As shown in FIG. 3, the drum cartridge 5Y has a drum frame 51 in addition to the above-mentioned photosensitive drum 11Y, charging device 12Y, and developing device 13Y.

[0076] The drum frame 51 supports the photosensitive drum 11Y, the charging device 12Y, the developing device 13Y, and the drum cleaner 52. The drum frame 51 has drum side plates 511A and 511B, toner guides 512A and 512B, a receiving portion 513, a toner shutter 514, a seal member 515, and cylindrical portions 516A and 516B (see FIG. 6).

[0077] 2.1 Drum side panels 511A, 511B The drum side plate 511A is located at one end of the drum cartridge 5Y in the axial direction. The drum side plate 511A has an outer surface S1 and an inner surface S2. The inner surface S2 is located between the outer surface S1 and the drum side plate 511B in the axial direction.

[0078] The drum side plate 511B is located at the other end of the drum cartridge 5Y in the axial direction. The drum side plate 511B is located away from the drum side plate 511A in the axial direction. The drum side plate 511B has an outer surface S11 and an inner surface S12. The inner surface S12 is located between the outer surface S11 and the drum side plate 511A in the axial direction.

[0079] 2.2 Toner guides 512A, 512B The toner guide 512A is located on the inner surface S2 of the drum side plate 511A. The toner guide 512A is located on the opposite side of the developing device 13Y with respect to the receiving portion 513. The toner guide 512A is a recessed groove. The toner guide 512A has a guide portion 5121A and a lock portion 5122A.

[0080] The guide portion 5121A extends in a second direction. The second direction intersects with the first direction and the axial direction. More specifically, the second direction intersects with the first direction and is perpendicular to the axial direction. When the toner cartridge 6Y is attached to the drum cartridge 5Y, the guide portion 5121A guides a protrusion 62A (see FIG. 12) of the toner cartridge 6Y. The protrusion 62A will be described later. The guide portion 5121A has one end in the second direction and the other end in the second direction. The other end of the guide portion 5121A is located between the one end of the guide portion 5121A and the receiving portion 513 in the second direction.

[0081] The lock portion 5122A is located at the other end of the guide portion 5121A. The lock portion 5122A extends in a direction intersecting the second direction. The lock portion 5122A extends in a direction perpendicular to the first direction and the axial direction.

[0082] The toner guide 512B is located on the inner surface S12 of the drum side plate 511B. The toner guide 512B has a guide portion 5121B and a lock portion 5122B. The guide portion 5121B has the same shape as the guide portion 5121A. The lock portion 5122B has the same shape as the lock portion 5122A. When the toner cartridge 6Y is attached to the drum cartridge 5Y, the guide portion 5121B guides a protrusion 62B (see FIG. 12) of the toner cartridge 6Y. The protrusion 62B will be described later.

[0083] 2.3 Receiving part 513 When the toner cartridge 6Y is supported by the drum cartridge 5Y, the receiving portion 513 receives the second accommodating portion 612 (see FIG. 12) of the toner cartridge 6Y. The receiving portion 513 extends in the axial direction. One end of the receiving portion 513 in the axial direction is connected to the drum side plate 511A. The other end of the receiving portion 513 in the axial direction is connected to the drum side plate 511B. The receiving portion 513 has a semi-cylindrical shape. The receiving portion 513 has a toner receiving opening 5131 and multiple holes 5132A, 5132B.

[0084] The toner receiving opening 5131 is located in the axial center of the receiving portion 513. The toner receiving opening 5131 communicates with the developing opening 133 (see FIG. 5) of the developing casing 131Y.

[0085] The hole 5132A is located between the toner receiving opening 5131 and the drum side plate 511A in the axial direction. The hole 5132A is located away from the toner receiving opening 5131 in the axial direction.

[0086] The hole 5132B is located between the toner receiving opening 5131 and the drum side plate 511B in the axial direction. The hole 5132B is located on the opposite side of the hole 5132A with respect to the toner receiving opening 5131 in the axial direction. The hole 5132B is located away from the toner receiving opening 5131 in the axial direction.

[0087] 2.4 Toner Shutter 514 The toner shutter 514 is attached to the receiving portion 513. The toner shutter 514 is movable between a closed position (see FIG. 3) and an open position (see FIG. 4). As shown in FIG. 3, when the toner shutter 514 is in the closed position, the toner shutter 514 closes the toner receiving port 5131. As shown in FIG. 4, when the toner shutter 514 is in the open position, the toner receiving port 5131 opens. The toner shutter 514 has a toner shutter opening 5141, a plurality of through holes 5142A, 5142B, and a plurality of through holes 5143A, 5143B.

[0088] The toner shutter opening 5141 extends in the axial direction. When the toner shutter 514 is in the open position, at least a portion of the toner shutter opening 5141 communicates with the toner receiving port 5131. Thus, when the toner shutter 514 is in the open position, the toner receiving port 5131 is open. On the other hand, as shown in FIG. 3, when the toner shutter 514 is in the closed position, the toner shutter opening 5141 is located away from the toner receiving port 5131.

[0089] The through hole 5142A is located between the toner shutter opening 5141 and the drum side plate 511A in the axial direction. The through hole 5142A is located away from the toner shutter opening 5141 in the axial direction. The through hole 5142A extends in the moving direction of the toner shutter 514. As shown in FIGS. 3 and 4, the through hole 5142A communicates with the hole 5132A both when the toner shutter 514 is in the closed position and when the toner shutter 514 is in the open position.

[0090] As shown in FIG. 3, the through hole 5142B is located between the toner shutter opening 5141 and the drum side plate 511B in the axial direction. The through hole 5142B is located on the opposite side of the through hole 5142A with respect to the toner shutter opening 5141 in the axial direction. The through hole 5142B is located away from the toner shutter opening 5141 in the axial direction. The through hole 5142B extends in the moving direction of the toner shutter 514. As shown in FIG. 3 and FIG. 4, the through hole 5142B communicates with the hole 5132B both when the toner shutter 514 is located at the closed position and when the toner shutter 514 is located at the open position.

[0091] 3, the through hole 5143A is located between the through hole 5142A and the drum side plate 511A in the axial direction. The through hole 5143A is located on the opposite side of the toner shutter opening 5141 with respect to the through hole 5142A in the axial direction.

[0092] The through hole 5143B is located between the through hole 5142B and the drum side plate 511B in the axial direction. The through hole 5143B is located on the opposite side of the toner shutter opening 5141 with respect to the through hole 5142B in the axial direction.

[0093] 2.5 Sealing material 515 3 and 5, the seal member 515 is located between the receiving portion 513 and the developing housing 131Y. The seal member 515 seals between the receiving portion 513 and the developing housing 131Y. The seal member 515 surrounds the toner receiving opening 5131 and the developing opening 133. The seal member 515 is made of, for example, a sponge.

[0094] 2.6 Cylindrical Parts 516A, 516B As shown in Fig. 3, the cylindrical portion 516A is located on the opposite side of the drum side plate 511A from the drum side plate 511B in the axial direction. The cylindrical portion 516A extends from the outer surface S1 of the drum side plate 511A. The cylindrical portion 516A may be attached to the drum side plate 511A. The cylindrical portion 516A extends in the axial direction. The cylindrical portion 516A receives one end of the photosensitive drum 11Y in the axial direction.

[0095] As shown in Fig. 6, the cylindrical portion 516B is located on the opposite side of the drum side plate 511B from the drum side plate 511A in the axial direction. The cylindrical portion 516B extends from the outer surface S11 of the drum side plate 511B. The cylindrical portion 516B may be attached to the drum side plate 511B. The cylindrical portion 516B extends in the axial direction. The cylindrical portion 516B receives the other end of the photosensitive drum 11Y in the axial direction.

[0096] 3. Details of Drawer 4 The drawer 4 will be described in detail with reference to FIGS.

[0097] In the following description of the drawer 4, the "axial direction" refers to the "axial direction" in a state in which the drum cartridge 5Y is attached to the drawer 4.

[0098] The drawer 4 has two side plates 41A, 41B (see FIG. 6), two positioning plates 42A, 42B (see FIG. 6), a plurality of locking members 43Y, 43M, 43C, 43K (see FIG. 7), a plurality of levers 44Y, 44M, 44C, 44K (see FIG. 7), a plurality of locking members 45Y (see FIG. 6), 45M, 45C, 45K, and a plurality of levers 46Y (see FIG. 6), 46M, 46C, 46K. Note that the locking members 45M, 45C, 45K and the levers 46M, 46C, 46K are not shown.

[0099] 3.1 Side plate 41A As shown in FIG. 6, the side plate 41A is located at one end of the drawer 4 in the axial direction. When the drum cartridge 5Y is attached to the drawer 4, the side plate 41A faces the drum side plate 511A in the axial direction. When the drum cartridge 5Y is attached to the drawer 4, the side plate 41A faces the drum side plate 511B in the axial direction with respect to the drum side plate 511A. The side plate 41A has an outer surface S21 and an inner surface S22. When the drum cartridge 5Y is attached to the drawer 4, the outer surface S21 faces the drum cartridge 5Y with respect to the inner surface S22 in the axial direction. The inner surface S22 is located between the outer surface S21 and the side plate 41B in the axial direction. When the drum cartridge 5Y is attached to the drawer 4, the inner surface S22 faces the drum cartridge 5Y.

[0100] 8, side plate 41A has a plurality of drawer guides 411Y, 411M, 411C, 411K, a plurality of through holes 412Y, 412M, 412C, 412K, a plurality of holes 413Y (see FIG. 7), a plurality of holes 413M (see FIG. 7), a plurality of holes 413C (see FIG. 7), and a plurality of holes 413K (see FIG. 7). In other words, drawer 4 has a plurality of drawer guides 411Y, 411M, 411C, 411K, a plurality of through holes 412Y, 412M, 412C, 412K, a plurality of holes 413Y, a plurality of holes 413M, a plurality of holes 413C, and a plurality of holes 413K.

[0101] 3.1.1 Drawer Guide 411Y, 411M, 411C, 411K The drawer guides 411Y, 411M, 411C, and 411K are aligned in the first direction at intervals from one another.

[0102] The drawer guide 411Y guides the attachment of the drum cartridge 5Y to the drawer 4. Specifically, the drawer guide 411Y guides one end of the photosensitive drum 11Y in the axial direction when the drum cartridge 5Y is attached to the drawer 4. The drawer guide 411Y is located on the inner surface S22 of the side plate 41A. The drawer guide 411Y extends in a guide direction. The guide direction intersects with the first direction and the axial direction. Specifically, the guide direction intersects with the first direction and is perpendicular to the axial direction. The drawer guide 411Y has one end E1 and the other end E2 in the guide direction. The other end E2 is located between the one end E1 and the lock member 43Y in the guide direction. The drawer guide 411Y is a recess. The drawer guide 411Y may be a rib. When the drum cartridge 5Y is attached to the drawer 4, the cylindrical portion 516A (see FIG. 6) of the drum cartridge 5Y fits into the drawer guide 411Y.

[0103] The description of each of the drawer guides 411M, 411C, and 411K is similar to the description of the drawer guide 411Y, so the description of the drawer guides 411M, 411C, and 411K will be omitted.

[0104] 3.1.2 Through hole 412Y, 412M, 412C, 412K The through hole 412Y is located on the other side of the drawer guide 411Y in the guide direction. In other words, the through hole 412Y is located on the opposite side of one end E1 of the drawer guide 411Y with respect to the other end E2 of the drawer guide 411Y in the guide direction. The through hole 412Y has a circular shape. As shown in FIG 6, the through hole 412Y penetrates from the inner surface S22 of the side plate 41A to the outer surface S21 of the side plate 41A.

[0105] The description of each of the through holes 412M, 412C, and 412K is similar to the description of the through hole 412Y, and therefore the description of each of the through holes 412M, 412C, and 412K will be omitted.

[0106] 3.1.3 Holes 413Y, 413M, 413C, 413K 6 and 7, the hole 413Y is located on the outer surface S21 of the side plate 41A. The hole 413Y is located on the edge of the through hole 412M. The hole 413Y is recessed from the outer surface S21 toward the inner surface S22 in the axial direction. The hole 413Y may be a through hole.

[0107] The explanation for each of the holes 413M, 413C, and 413K is similar to the explanation for the hole 413Y, so the explanation for the holes 413M, 413C, and 413K will be omitted.

[0108] 3.2 Side plate 41B As shown in FIG. 6, the side plate 41B is located at the other end of the drawer 4 in the axial direction. The side plate 41B is located away from the side plate 41A in the axial direction. When the drum cartridge 5Y is attached to the drawer 4, the side plate 41B faces the drum side plate 511B in the axial direction. When the drum cartridge 5Y is attached to the drawer 4, the side plate 41B is located on the opposite side of the drum side plate 511B from the drum side plate 511A in the axial direction. The side plate 41B has an outer surface S31 and an inner surface S32. The inner surface S32 is located between the outer surface S31 and the side plate 41A in the axial direction.

[0109] Side plate 41B has a plurality of drawer guides 414Y, 414M, 414C, and 414K, a plurality of through holes 415Y, 415M, 415C, and 415K, a plurality of holes 416Y, a plurality of holes 416M, a plurality of holes 416C, and a plurality of holes 416K. Drawer guides 414M, 414C, and 414K, through holes 415M, 415C, and 415K, and holes 416M, 416C, and 416K are not shown.

[0110] 3.2.1 Drawer Guide 414Y, 414M, 414C, 414K The drawer guides 414Y, 414M, 414C, and 414K are aligned in the first direction at intervals from one another.

[0111] The drawer guide 414Y, together with the drawer guide 411Y, guides the installation of the drum cartridge 5Y into the drawer 4. The drawer guide 414Y is located on the inner surface S32 of the side plate 41B. The drawer guide 414Y extends in the guide direction. The drawer guide 414Y is a recess. The drawer guide 414Y may be a rib. When the drum cartridge 5Y is installed in the drawer 4, the cylindrical portion 516B of the drum cartridge 5Y fits into the drawer guide 414Y.

[0112] The description of each of the drawer guides 414M, 414C, and 414K is similar to the description of the drawer guide 414Y, and therefore, the description of the drawer guides 414M, 414C, and 414K will be omitted.

[0113] 3.2.2 Through holes 415Y, 415M, 415C, 415K The through hole 415Y is located on the other side of the drawer guide 414Y in the guide direction. The through hole 415Y has a circular shape. The through hole 415Y penetrates from the inner surface S32 of the side plate 41B to the outer surface S31 of the side plate 41B.

[0114] The description of each of the through holes 415M, 415C, and 415K is similar to the description of the through hole 415Y, so the description of each of the through holes 415M, 415C, and 415K will be omitted.

[0115] 3.2.3 Holes 416Y, 416M, 416C, 416K As shown in Fig. 6, the hole 416Y is located on the outer surface S31 of the side plate 41B. The hole 416Y is located on the edge of the through hole 415M, similar to the hole 413Y (see Fig. 7). The hole 416Y is recessed from the outer surface S31 toward the inner surface S32 in the axial direction. The hole 416Y may be a through hole.

[0116] The description of each of the holes 416M, 416C, and 416K is similar to the description of the hole 416Y, so the description of the holes 416M, 416C, and 416K will be omitted.

[0117] 3.3 Positioning plates 42A, 42B As shown in Fig. 6, the positioning plate 42A is located at one end of the drawer 4 in the axial direction. The positioning plate 42A is located inside the inner surface S22 of the side plate 41A in the axial direction. In other words, the positioning plate 42A is located between the side plates 41A and 41B in the axial direction. As shown in Fig. 8, the positioning plate 42A extends in the first direction. The positioning plate 42A is made of a metal such as stainless steel or iron.

[0118] 6, when the drum cartridges 5Y, 5M, 5C, and 5K are attached to the drawer 4, the positioning plate 42A comes into contact with one end of each of the photosensitive drums 11Y, 11M, 11C, and 11K to determine the positions of the photosensitive drums 11Y, 11M, 11C, and 11K. In more detail, as shown in FIG. 8, the positioning plate 42A has a plurality of recesses 421Y, 421M, 421C, and 421K and a positioned portion 422.

[0119] 3.3.1 Recesses 421Y, 421M, 421C, 421K When the drum cartridge 5Y is attached to the drawer 4, one end of the photosensitive drum 11Y fits into the recess 421Y. The recess 421Y overlaps with the locking member 43Y in the axial direction. More specifically, when the locking member 43Y is in the locked position, the recess 421Y overlaps with the locking guide 431 of the locking member 43Y in the axial direction. The locking position and the locking guide 431 will be described later.

[0120] The recesses 421Y, 421M, 421C, and 421K are arranged in the first direction at intervals from each other. The description of the recesses 421M, 421C, and 421K is the same as the description of the recess 421Y. Therefore, the description of the recesses 421M, 421C, and 421K will be omitted.

[0121] 3.3.2 Positioned portion 422 When the drawer 4 is located at the inner position, the positioned portion 422 is positioned by the positioning member 23 of the main housing 2. In other words, when the drawer 4 is located at the inner position, the positioning member 23 of the main housing 2 positions the positioning plate 42A to the main housing 2.

[0122] The positioned portion 422 is located at one end of the positioning plate 42A in the first direction. When the drawer 4 is located at the inner position, the positioned portion 422 comes into contact with the positioning member 23. In this embodiment, the positioned portion 422 is a notch. When the drawer 4 is located at the inner position, the positioning member 23 of the main housing 2 fits into the notch, which is the positioned portion 422.

[0123] 3.4 Locking members 43Y, 43M, 43C, 43K As shown in FIG. 7, the locking member 43Y is located in the through hole 412Y of the side plate 41A. The locking member 43Y has a disk shape. When the drum cartridge 5Y is attached to the drawer 4, the locking member 43Y is movable between a locked position (see FIG. 9) and an unlocked position (see FIG. 10). The locking member 43Y is rotatable between the locked position and the unlocked position about a first axis A11 (see FIG. 6). The first axis A11 extends in the axial direction. In this embodiment, the first axis A11 coincides with the drum axis A1 (see FIG. 6). That is, the locking member 43Y is rotatable between the locked position and the unlocked position about the drum axis A1. The first axis A11 may be misaligned with the drum axis A1.

[0124] 9, when the locking member 43Y is located at the locked position with the drum cartridge 5Y attached to the drawer 4, the locking member 43Y locks the photosensitive drum 11Y to the drawer 4. "Locking the photosensitive drum 11Y to the drawer 4" means preventing the photosensitive drum 11Y from moving in the direction in which the drum cartridge 5Y is removed from the drawer 4.

[0125] As shown in FIG. 10, when the drum cartridge 5Y is attached to the drawer 4 and the lock member 43Y is located at the unlocking position, the lock of the photosensitive drum 11Y with respect to the drawer 4 is released.

[0126] As shown in Fig. 6, the locking member 43Y has an outer surface S41 and an inner surface S42. The inner surface S42 is located between the outer surface S41 and the side plate 41B of the drawer 4 in the axial direction. When the drum cartridge 5Y is attached to the drawer 4, the inner surface S42 faces the outer surface S1 of the drum side plate 511A. As shown in Fig. 8, the locking member 43Y has a lock guide 431, a lock portion 432, a through hole 433, a pressing member 434, and a spring 435.

[0127] The locking members 43M, 43C, and 43K will be described in the same manner as the locking member 43Y, and therefore a description of the locking members 43M, 43C, and 43K will be omitted.

[0128] 3.3.1 Lock Guide 431 The lock guide 431 extends in the radial direction of the lock member 43Y. When the drum cartridge 5Y is attached to the drawer 4, the cylindrical portion 516A (see FIG. 3) of the drum cartridge 5Y fits into the lock guide 431. As a result, when the drum cartridge 5Y is attached to the drawer 4, one end (see FIG. 6) of the photosensitive drum 11Y in the axial direction fits into the lock guide 431.

[0129] 9, when the locking member 43Y is in the locked position, the locking guide 431 extends in a direction intersecting the guide direction. In other words, when the locking member 43Y is in the locked position, the locking guide 431 extends in a direction intersecting the extension direction of the drawer guide 411Y. When the locking member 43Y is in the locked position, the locking guide 431 is not connected to the drawer guide 411Y.

[0130] Therefore, when the drum cartridge 5Y is attached to the drawer 4 and the locking member 43Y is located at the locking position, if the drum cartridge 5Y moves in the guide direction, the cylindrical portion 516A does not come out of the lock guide 431. As a result, when the drum cartridge 5Y is attached to the drawer 4 and the locking member 43Y is located at the locking position, the drum cartridge 5Y cannot be removed from the drawer 4.

[0131] 10, when the locking member 43Y is in the unlocked position, the lock guide 431 extends in the guide direction. In other words, when the locking member 43Y is in the unlocked position, the lock guide 431 extends in the direction in which the drawer guide 411Y extends. When the locking member 43Y is in the unlocked position, the lock guide 431 is connected to the drawer guide 411Y.

[0132] Therefore, when the drum cartridge 5Y is attached to the drawer 4 and the locking member 43Y is located at the unlocking position, if the drum cartridge 5Y moves in the guide direction, the cylindrical portion 516A comes out of the lock guide 431. As a result, when the drum cartridge 5Y is attached to the drawer 4 and the locking member 43Y is located at the unlocking position, the drum cartridge 5Y can be removed from the drawer 4.

[0133] 3.3.2 Locking part 432 6 and 9, the lock portion 432 is a part of the lock member 43Y. In this embodiment, the lock portion 432 is a wall that defines the lock guide 431.

[0134] As shown in FIG. 9, when the locking member 43Y is in the locking position, the locking portion 432 extends in a direction intersecting with the guide direction. In other words, when the locking member 43Y is in the locking position, the locking guide 431 extends in a direction intersecting with the extension direction of the drawer guide 411Y. When the drum cartridge 5Y is attached to the drawer 4 and the locking member 43Y is in the locking position, the locking portion 432 is located between one end of the photosensitive drum 11Y and the drawer guide 411Y. Therefore, when the drum cartridge 5Y is attached to the drawer 4 and the locking member 43Y is in the locking position, if the drum cartridge 5Y moves in the guide direction, the cylindrical portion 516A does not come out of the locking guide 431. As a result, when the drum cartridge 5Y is attached to the drawer 4 and the locking member 43Y is in the locking position, the locking portion 432 locks the photosensitive drum 11Y to the drawer 4.

[0135] On the other hand, as shown in Fig. 10, when the locking member 43Y is in the unlocked position, the locking portion 432 extends in the guide direction. In other words, when the locking member 43Y is in the unlocked position, the locking guide 431 extends in the direction in which the drawer guide 411Y extends. When the drum cartridge 5Y is attached to the drawer 4 and the locking member 43Y is in the unlocked position, the locking portion 432 retreats from between one end of the photosensitive drum 11Y and the drawer guide 411Y. Therefore, when the drum cartridge 5Y is attached to the drawer 4 and the locking member 43Y is in the unlocked position, and the drum cartridge 5Y moves in the guide direction, the cylindrical portion 516A comes out of the locking guide 431.

[0136] 3.3.3 Through Hole 433 As shown in Fig. 8, the through hole 433 is located at the center of the lock member 43Y. The through hole 433 is located inside the lock guide 431. The through hole 433 has a circular shape. As shown in Fig. 7, when the drum cartridge 5Y is attached to the drawer 4, the coupling 111Y of the photosensitive drum 11Y is exposed from the through hole 433. When the drum cartridge 5Y is attached to the drawer 4 and the drawer 4 is located at the inner position, the main body coupling (not shown) fits into the coupling 111Y through the through hole 433.

[0137] 3.3.4 Pressing member 434 As shown in FIG. 9, the pressing member 434 is attached to the locking portion 432. When the drum cartridge 5Y is attached to the drawer 4 and the locking member 43Y is in the locked position, the pressing member 434 is located between one end of the photosensitive drum 11Y and the drawer guide 411Y. When the drum cartridge 5Y is attached to the drawer 4 and the locking member 43Y is in the locked position, the pressing member 434 is located on the opposite side of the positioning plate 42A from one end of the photosensitive drum 11Y. When the drum cartridge 5Y is attached to the drawer 4 and the locking member 43Y is in the locked position, the pressing member 434 presses the cylindrical portion 516A of the drum cartridge 5Y toward the positioning plate 42A. As a result, when the drum cartridge 5Y is attached to the drawer 4 and the locking member 43Y is in the locked position, the pressing member 434 presses one end of the photosensitive drum 11Y toward the positioning plate 42A. Specifically, when the drum cartridge 5Y is attached to the drawer 4 and the locking member 43Y is in the locked position, the pressing member 434 presses one end of the photosensitive drum 11Y toward the recessed portion 421Y of the positioning plate 42A.

[0138] 10, when the drum cartridge 5Y is attached to the drawer 4 and the locking member 43Y is in the unlocked position, the pressing member 434 retreats from between one end of the photosensitive drum 11Y and the drawer guide 411Y. As a result, when the drum cartridge 5Y is attached to the drawer 4 and the locking member 43Y is in the unlocked position, the pressing of the pressing member 434 against the one end of the photosensitive drum 11Y toward the positioning plate 42A is released.

[0139] 3.3.5 Spring 435 9, the spring 435 presses the pressing member 434. When the drum cartridge 5Y is attached to the drawer 4, the spring 435 presses the pressing member 434 toward one end of the photosensitive drum 11Y.

[0140] When the drum cartridge 5Y is attached to the drawer 4 and the locking member 43Y is in the locked position, the spring 435 presses the pressing member 434 toward the positioning plate 42A.

[0141] 3.5 Lever 44Y, 44M, 44C, 44K The explanation for each of the levers 44M, 44C, and 44K is the same as the explanation for the lever 44Y, so in the following explanation, the explanation for the levers 44M, 44C, and 44K will be omitted.

[0142] As shown in Figs. 6 and 7, the lever 44Y is attached to an outer surface S41 of the locking member 43Y. This allows the lever 44Y to move together with the locking member 43Y. The lever 44Y is located outside the outer surface S21 of the side plate 41A in the axial direction. In other words, the lever 44Y is located on the opposite side of the side plate 41B from the side plate 41A in the axial direction. The lever 44Y is operated by an operator to move the locking member 43Y. In detail, the lever 44Y is operated by an operator to move the locking member 43Y between a locked position (see Fig. 9) and an unlocked position (see Fig. 10).

[0143] Here, the lever 44Y has a function of locking the locking member 43Y in the locking position. More specifically, as shown in Fig. 6, when the locking member 43Y is in the locking position, the lever 44Y can move between a first position and a second position. The lever 44Y in the first position is shown by a solid line in Fig. 6. The lever 44Y in the second position is shown by a virtual line in Fig. 6.

[0144] When the lock member 43Y is in the locked position and the lever 44Y is in the first position, the lever 44Y is locked to the side plate 41A. This causes the lever 44Y to lock the lock member 43Y in the locked position. When the lever 44Y is in the first position, the lever 44Y extends along the outer surface S21 of the side plate 41A.

[0145] On the other hand, when the locking member 43Y is in the locked position and the lever 44Y is in the second position, the lock of the lever 44Y to the side plate 41A is released. This causes the lever 44Y to release the lock of the locking member 43Y in the locked position. When the lever 44Y is in the second position, the locking member 43Y is movable between the locked position and the unlocked position. When the lever 44Y is in the second position, the lever 44Y protrudes from the outer surface S21 of the side plate 41A.

[0146] In addition, when the lever 44Y is located at the second position and the lock member 43Y has moved from the lock position, the lever 44Y cannot move from the second position to the first position. Therefore, when the drawer 4 is located at the outer position (see FIG. 2) and the lever 44Y is located at the second position, if the drawer 4 moves from the outer position to the inner position (see FIG. 1), the lever 44Y abuts against the abutment portion of the main body housing 2. This makes it possible to prevent the drawer 4 from being located at the inner position when the lock member 43Y is not located at the lock position. Therefore, it is possible to prompt the operator to place the lock member 43Y at the lock position. In this embodiment, the abutment portion is the edge of the opening 21 of the main body housing 2. That is, the main body housing 2 has the abutment portion.

[0147] 6 and 11, when the drum cartridge 5Y is attached to the drawer 4 and the lever 44Y is in the second position, the lever 44Y covers at least a part of the coupling 111Y in the axial direction. This prevents the main body coupling (not shown) from fitting into the coupling 111Y even if the drawer 4 is in the inner position when the locking member 43Y is not in the locked position. This prevents image formation from starting when the photosensitive drum 11Y is not locked to the drawer 4.

[0148] The lever 44Y has a lever body 441 and two protrusions 442A and 442B.

[0149] 3.5.1 Lever body 441 When the drum cartridge 5Y is attached to the drawer 4 and the lever 44Y is located at the second position, the lever body 441 extends in the radial direction of the photosensitive drum 11Y. In other words, when the drum cartridge 5Y is attached to the drawer 4 and the lever 44Y is located at the second position, the lever 44Y extends in the radial direction of the photosensitive drum 11Y. The lever body 441 has a first end 441A, a second end 441B, and a circular arc portion 441C.

[0150] The first end 441A is one end of the lever body 441 in the direction in which the lever 44Y extends. The second end 441B is the other end of the lever body 441 in the direction in which the lever 44Y extends. In other words, the lever 44Y has a first end 441A and a second end 441B in the direction in which the lever 44Y extends. The second end 441B is located on the opposite side of the through hole 433 of the locking member 43Y to the first end 441A.

[0151] 7, when the lever 44Y is located at the first position, the arc portion 441C fits along the edge of the through hole 433 of the locking member 43Y. As a result, when the lever 44Y is located at the first position, the lever 44Y does not cover the through hole 433 of the locking member 43Y.

[0152] 3.5.2 Protrusions 442A, 442B 11, the protrusion 442A extends from a first end 441A of the lever body 441. The protrusion 442A may be attached to the first end 441A of the lever body 441.

[0153] The protrusion 442B extends from the second end 441B of the lever body 441. The protrusion 442B may be attached to the second end 441B of the lever body 441.

[0154] 6, when the locking member 43Y is in the locked position and the lever 44Y is in the first position, the protrusion 442A of the lever 44Y fits into one of the two holes 413Y in the side plate 41A, and the protrusion 442B of the lever 44Y fits into the other of the two holes 413Y in the side plate 41A. This locks the lever 44Y to the side plate 41A.

[0155] When the locking member 43Y is in the locked position and the lever 44Y is in the second position, the projection 442A of the lever 44Y comes out of one of the two holes 413Y in the side plate 41A, and the projection 442B of the lever 44Y comes out of the other of the two holes 413Y in the side plate 41A. This releases the lock of the lever 44Y from the side plate 41A.

[0156] 3.6 Locking members 45Y, 45M, 45C, 45K The locking member 45Y is located in a through hole 415Y of the side plate 41B. The description of the locking member 45Y is similar to the description of the locking member 43Y. Therefore, the description of the locking member 45Y will be omitted.

[0157] Further, the description of each of the locking members 45M, 45C, and 45K is similar to the description of the locking member 43Y, and therefore the description of each of the locking members 45M, 45C, and 45K will also be omitted.

[0158] 3.7 Levers 46Y, 46M, 46C, 46K The lever 46Y is attached to the outer surface S51 of the lock member 45Y. The description of the lever 46Y is similar to the description of the lever 44Y. Therefore, the description of the lever 46Y will be omitted.

[0159] Further, the description of each of the levers 46M, 46C, and 46K is similar to the description of the lever 46Y, so the description of each of the levers 46M, 46C, and 46K will also be omitted.

[0160] 4. Toner Cartridge 6Y Details The toner cartridge 6Y will be described in detail with reference to FIGS.

[0161] The description of each of the toner cartridges 6M, 6C, and 6K is the same as the description of the toner cartridge 6Y, and therefore the description of the toner cartridges 6M, 6C, and 6K will be omitted.

[0162] In addition, in the following description of the toner cartridge 6Y, the "axial direction" refers to the "axial direction" in a state in which the toner cartridge 6Y is attached to the drum cartridge 5Y.

[0163] As shown in Fig. 12, the toner cartridge 6Y extends in the axial direction. The toner cartridge 6Y includes a toner housing 61, a plurality of protrusions 62A and 62B, a plurality of protrusions 63A and 63B, a toner shutter 64, a plurality of protrusions 65A and 65B, and a toner conveying member 66 (see Fig. 16).

[0164] 4.1 Toner housing 61 With the toner cartridge 6Y attached to the drum cartridge 5Y, the toner housing 61 can rotate about the second axis A12 between a cartridge first position (see FIG. 13) and a cartridge second position (see FIG. 14). In other words, with the toner cartridge 6Y attached to the drum cartridge 5Y, the toner cartridge 6Y can rotate about the second axis A12 between the cartridge first position and the cartridge second position. The second axis A12 extends in the axial direction.

[0165] As shown in FIG. 13, when the toner housing 61 is located at the cartridge first position, the protrusion 62A (see FIG. 12) fits into the locking portion 5122A (see FIG. 3) of the drum cartridge 5Y, and the protrusion 62B (see FIG. 12) fits into the locking portion 5122B (see FIG. 3) of the drum cartridge 5Y. As a result, when the toner housing 61 is located at the cartridge first position, the toner cartridge 6Y is locked to the drum cartridge 5Y. "The toner cartridge 6Y is locked to the drum cartridge 5Y" means that the toner cartridge 6Y cannot be removed from the drum cartridge 5Y. As shown in FIG. 14, when the toner housing 61 is located at the cartridge second position, the protrusion 62A (see FIG. 12) comes off the locking portion 5122A (see FIG. 3) of the drum cartridge 5Y, and the protrusion 62B (see FIG. 12) comes off the locking portion 5122B (see FIG. 3) of the drum cartridge 5Y. As a result, with the toner housing 61 located in the second cartridge position, the toner cartridge 6Y is unlocked from the drum cartridge 5Y.

[0166] 12, the toner housing 61 extends in the axial direction. The toner housing 61 has a first container 611, a second container 612, and a plurality of connectors 613A and 613B.

[0167] 4.1.1 First Container 611 The first container 611 extends in the axial direction. The first container 611 has a cylindrical shape. The first container 611 is capable of containing toner. In other words, the toner housing 61 is capable of containing toner.

[0168] 4.1.2 Second Container 612 The second storage portion 612 is located away from the first storage portion 611 in the third direction. The third direction intersects with the axial direction. Preferably, the third direction is perpendicular to the axial direction. The second storage portion 612 extends in the axial direction. The second storage portion 612 has a cylindrical shape. The volume of the second storage portion 612 is smaller than the volume of the first storage portion 611. The second storage portion 612 has a toner discharge port 614. In other words, the toner housing 61 has the toner discharge port 614.

[0169] The toner discharge port 614 is located between the protrusions 63A and 63B in the axial direction. The toner discharge port 614 is located at the center of the second container 612 in the axial direction. The toner discharge port 614 extends in the axial direction. The toner discharge port 614 is capable of discharging the toner in the toner housing 61.

[0170] 4.1.3 Connections 613A, 613B The connecting portion 613A is located between one end of the first accommodating portion 611 in the axial direction and one end of the second accommodating portion 612 in the axial direction. The connecting portion 613A connects one end of the first accommodating portion 611 in the axial direction and one end of the second accommodating portion 612 in the axial direction.

[0171] The connecting portion 613B is located between the other end of the first accommodating portion 611 in the axial direction and the other end of the second accommodating portion 612 in the axial direction. The connecting portion 613B is located at a distance from the connecting portion 613A in the axial direction. The connecting portion 613B connects the other end of the first accommodating portion 611 in the axial direction and the other end of the second accommodating portion 612 in the axial direction.

[0172] Second container 612 communicates with first container 611 via connecting portion 613A and connecting portion 613B. Toner in first container 611 flows into second container 612 through connecting portion 613A and connecting portion 613B.

[0173] 4.2 Protrusions 62A, 62B The protrusion 62A is located at one end of the toner cartridge 6Y in the axial direction. The protrusion 62A is located at one end of the second accommodating portion 612 in the axial direction. The protrusion 62A protrudes in the axial direction from one end of the second accommodating portion 612 in the axial direction. The protrusion 62A extends in the radial direction of the second accommodating portion 612. The protrusion 62A extends in the third direction.

[0174] The protrusion 62B is located at the other end of the toner cartridge 6Y in the axial direction. The protrusion 62B is located at the other end of the second accommodating portion 612 in the axial direction. The protrusion 62B protrudes in the axial direction from the other end of the second accommodating portion 612 in the axial direction. The protrusion 62B extends in the radial direction of the second accommodating portion 612. The protrusion 62B extends in the third direction.

[0175] 4.3 Protrusions 63A, 63B The protrusion 63A is located between the toner discharge port 614 and the protrusion 62A in the axial direction. The protrusion 63A is located between the toner shutter 64 and the protrusion 62A in the axial direction. The protrusion 63A is located on the opposite side of the second container portion 612 from the first container portion 611 in the third direction. The protrusion 63A extends from the circumferential surface of the second container portion 612 in the third direction.

[0176] The protrusion 63B is located away from the protrusion 63A in the axial direction. The protrusion 63B is located on the opposite side of the protrusion 63A with respect to the toner discharge port 614 in the axial direction. The protrusion 63B is located between the toner discharge port 614 and the protrusion 62B in the axial direction. The protrusion 63B is located on the opposite side of the protrusion 63A with respect to the toner shutter 64 in the axial direction. The protrusion 63B is located between the toner shutter 64 and the protrusion 62B in the axial direction. The protrusion 63B is located on the opposite side of the first container 611 with respect to the second container 612 in the third direction. The protrusion 63B extends in the third direction from the circumferential surface of the second container 612.

[0177] 4.4 Toner Shutter 64 The toner shutter 64 is located between the connection portion 613A and the connection portion 613B in the axial direction. The toner shutter 64 is located on the circumferential surface of the second storage portion 612. The toner shutter 64 is movable relative to the toner discharge port 614 between a toner closed position (see FIG. 12) and a toner open position (see FIG. 15). As shown in FIG. 12, when the toner shutter 64 is located at the closed position, the toner shutter 64 closes the toner discharge port 614. As shown in FIG. 14, when the toner cartridge 6Y is mounted on the drum cartridge 5Y and the toner housing 61 is located at the cartridge second position, the toner shutter 64 is located at the toner closed position. As shown in FIG. 15, when the toner shutter 64 is located at the open position, the toner discharge port 614 is open. As shown in FIG. 13, when the toner cartridge 6Y is mounted on the drum cartridge 5Y and the toner housing 61 is located at the cartridge first position, the toner shutter 64 is located at the toner open position.

[0178] As shown in Fig. 12, the toner shutter 64 extends in the axial direction. The toner shutter 64 has a cylindrical shape. The toner shutter 64 has an opening 641. The opening 641 extends in the axial direction. When the toner shutter 64 is in the closed position, the opening 641 is located away from the toner discharge port 614. As shown in Fig. 15, when the toner shutter 64 is in the open position, at least a portion of the opening 641 communicates with the toner discharge port 614.

[0179] 4.5 Protrusion 65A, 65B 12, the protrusion 65A is located on the peripheral surface of the toner shutter 64. The protrusion 65A extends from the peripheral surface of the toner shutter 64. The protrusion 65A is located between the opening 641 and the protrusion 63A in the axial direction.

[0180] The protrusion 65B is located away from the protrusion 65A in the axial direction. The protrusion 65B is located on the opposite side of the opening 641 to the protrusion 65A in the axial direction. The protrusion 65B is located on the circumferential surface of the toner shutter 64. The protrusion 65B extends from the circumferential surface of the toner shutter 64. The protrusion 65B is located between the opening 641 and the protrusion 63B in the axial direction.

[0181] 4.6 Toner transport member 66 As shown in FIG. 16, the toner transport member 66 is located in the second storage unit 612. The toner transport member 66 is rotatable about an axis A21. The axis A21 extends in the axial direction. The toner transport member 66 extends along the axis A21. The toner transport member 66 transports the toner that has entered the second storage unit 612 through the connection portion 613A and the toner that has entered the second storage unit 612 through the connection portion 613B toward the toner discharge port 614.

[0182] 5. Replacing the toner cartridge 6Y Next, the replacement operation of the toner cartridge 6Y will be described with reference to FIGS. 1 to 3, 6, 7, and 12 to 14.

[0183] As shown in FIGS. 1 and 2, to replace the toner cartridge 6Y, an operator first moves the drawer 4 from the inner position (see FIG. 1) to the outer position (see FIG. 2).

[0184] 6 and 7, when the drawer 4 is in the outer position, the locking member 43Y is in the locked position, and the lever 44Y is in the first position. With the lever 44Y in the first position, the locking member 43Y is locked in the locked position. With the locking member 43Y in the locked position, the photosensitive drum 11Y is locked to the drawer 4.

[0185] Next, as shown in FIGS. 13 and 14, the worker moves the toner housing 61 from the cartridge first position (see FIG. 13) to the cartridge second position (see FIG. 14).

[0186] Then, as shown in FIG. 14, with the toner housing 61 located in the second cartridge position, the toner shutter 64 of the toner cartridge 6Y is located in the closed position, and the toner shutter 514 of the drum cartridge 5Y is located in the closed position.

[0187] Next, the worker pulls out the toner cartridge 6Y from the drum cartridge 5Y in the third direction, whereby the toner cartridge 6Y is detached from the drum cartridge 5Y.

[0188] At this time, since the photosensitive drum 11Y is locked to the drawer 4, the photosensitive drum 11Y can be prevented from moving relative to the drawer 4.

[0189] Next, when the drawer 4 is in the outer position and the drum cartridge 5Y is attached to the drawer 4, to attach the toner cartridge 6Y to the drum cartridge 5Y, the worker first fits the protrusion 62A (see Figure 12) into the toner guide 512A (see Figure 3) and then fits the protrusion 62B (see Figure 12) into the toner guide 512B (see Figure 3).

[0190] As a result, the second accommodating portion 612 of the toner cartridge 6Y is guided by the toner guide 512A and the toner guide 512B toward the receiving portion 513. The second accommodating portion 612 fits into the receiving portion 513 as shown in FIG.

[0191] Then, the toner cartridge 6Y is supported by the drum cartridge 5Y. At this time, the toner housing 61 is located at the cartridge second position.

[0192] When the toner cartridge 6Y is supported by the drum cartridge 5Y and the toner housing 61 is located at the cartridge second position, the protrusion 65A (see FIG. 12) passes through the through hole 5142A (see FIG. 3) of the toner shutter 514 and fits into the hole 5132A (see FIG. 3) of the receiving portion 513, and the protrusion 65B (see FIG. 12) passes through the through hole 5142B (see FIG. 3) of the toner shutter 514 and fits into the hole 5132B (see FIG. 3) of the receiving portion 513. The toner shutter 64 is fixed to the receiving portion 513 by the protrusion 65A fitting into the hole 5132A of the receiving portion 513 and the protrusion 65B fitting into the hole 5132B of the receiving portion 513.

[0193] Furthermore, the protrusion 63A (see FIG. 12) fits into the through hole 5143A (see FIG. 3) of the toner shutter 514, and the protrusion 63B (see FIG. 12) fits into the through hole 5143B (see FIG. 3) of the toner shutter 514. The protrusion 63A fits into the through hole 5143A of the toner shutter 514, and the protrusion 63B fits into the through hole 5143B of the toner shutter 514, so that the toner shutter 514 can move together with the toner housing 61.

[0194] 13 and 14, the worker moves the toner housing 61 from the cartridge second position (see FIG. 14) to the cartridge first position (see FIG. 13). At this time, the toner housing 61 pivots about the second container portion 612.

[0195] Then, as the toner housing 61 moves from the cartridge second position to the cartridge first position, the toner shutter 64 moves from the closed position to the open position relative to the toner housing 61. Also, as the toner housing 61 moves from the cartridge second position to the cartridge first position, the toner shutter 514 moves from the closed position to the open position.

[0196] 13, when the toner housing 61 is located in the cartridge first position, the toner shutter 64 is located in the open position, and the toner shutter 514 is located in the open position. Then, the toner discharge port 614 communicates with the toner receiving port 5131. This allows the toner receiving port 5131 to receive the toner discharged from the toner discharge port 614.

[0197] Next, the worker moves the drawer 4 from the outer position to the inner position. This completes the replacement work of the toner cartridge 6Y.

[0198] 6. Replacing the drum cartridge 5Y Next, the replacement operation of the drum cartridge 5Y will be described with reference to FIGS. 1 to 3 and 6 to 11.

[0199] The drum cartridge 5Y may be replaced with the toner cartridge 6Y still attached to the drum cartridge 5Y, or may be replaced with the toner cartridge 6Y removed from the drum cartridge 5Y and still attached.

[0200] As shown in FIGS. 1 and 2, to replace the drum cartridge 5Y, an operator first moves the drawer 4 from the inner position (see FIG. 1) to the outer position (see FIG. 2).

[0201] 6 and 7, when the drawer 4 is in the outer position, the locking member 43Y is in the locked position, and the lever 44Y is in the first position. Also, the locking member 45Y (see FIG. 6) is in the locked position, and the lever 46Y (see FIG. 6) is in the first position.

[0202] When the lever 44Y is in the first position, the locking member 43Y is locked in the locked position, and when the lever 46Y is in the first position, the locking member 45Y is locked in the locked position.

[0203] The photosensitive drum 11Y is locked to the drawer 4 by the locking member 43Y being in the locking position and the locking member 45Y being in the locking position.

[0204] Next, the worker moves the lever 44Y from the first position to the second position. Then, with the lever 44Y in the second position, the locking member 43Y is unlocked. Also, the worker moves the lever 46Y from the first position to the second position. Then, with the lever 46Y in the second position, the locking member 45Y is unlocked.

[0205] Next, as shown in Fig. 7 and Fig. 11, the worker rotates the locking member 43Y from the locking position to the unlocking position. The worker also rotates the locking member 45Y (see Fig. 6) from the locking position to the unlocking position. Then, as shown in Fig. 10, the locking of the photosensitive drum 11Y with respect to the drawer 4 is released in a state in which the locking member 43Y is located at the unlocking position and the locking member 45Y (see Fig. 6) is located at the unlocking position.

[0206] Next, the worker pulls out the drum cartridge 5Y from the drawer 4. Then, the cylindrical portion 516A (see FIG. 3) of the drum cartridge 5Y is disengaged from the lock guide 431 of the locking member 43Y, and the cylindrical portion 516B (see FIG. 6) of the drum cartridge 5Y is disengaged from the lock guide 451 (see FIG. 6) of the locking member 45Y, and the drum cartridge 5Y is removed from the drawer 4.

[0207] Next, to install the drum cartridge 5Y in the drawer 4 with the drawer 4 in the outer position, the operator first fits the cylindrical portion 516A into the drawer guide 411Y of the drawer 4 and fits the cylindrical portion 516B into the drawer guide 414Y of the drawer 4, as shown in Fig. 6. As a result, the drum cartridge 5Y is guided by the drawer guide 411Y and the drawer guide 414Y and installed in the drawer 4.

[0208] When the drum cartridge 5Y is attached to the drawer 4, the cylindrical portion 516A of the drum cartridge 5Y fits into the lock guide 431 of the locking member 43Y, and the cylindrical portion 516B of the drum cartridge 5Y fits into the lock guide 451 of the locking member 45Y.

[0209] 7 and 11, the worker grasps the lever 44Y located at the second position and rotates the locking member 43Y from the unlocked position to the locked position. The worker also grasps the lever 46Y (see FIG. 6) located at the second position and rotates the locking member 45Y (see FIG. 6) from the unlocked position to the locked position.

[0210] Then, as shown in FIG. 9, the photosensitive drum 11Y is locked to the drawer 4 with the locking member 43Y located at the locking position and the locking member 45Y (see FIG. 6) located at the locking position.

[0211] Next, the worker moves the lever 44Y from the second position to the first position. Also, the worker moves the lever 46Y (see FIG. 6) from the second position to the first position. Next, the worker moves the drawer 4 from the outer position to the inner position. This completes the replacement operation of the drum cartridge 5Y.

[0212] 7. Effects (1) According to the image forming device 1, when the toner cartridge 6Y is replaced while the drum cartridge 5Y is attached to the drawer 4 as shown in FIG. 2, the toner cartridge 6Y can be replaced with respect to the drum cartridge 5Y while the photosensitive drum 11Y is locked to the drawer 4 by the locking member 43Y as shown in FIG. 9.

[0213] Therefore, the photosensitive drum 11Y can be prevented from moving relative to the drawer 4 during the replacement work of the toner cartridge 6Y.

[0214] As a result, the positioning accuracy of the photosensitive drum 11Y in the main body housing 2 can be prevented from decreasing.

[0215] (2) According to the image forming apparatus 1, as shown in FIGS. 9 and 10, the locking member 43Y is rotatable about a first shaft A11 extending in the axial direction between a locked position (see FIG. 9) and an unlocked position (see FIG. 10).

[0216] Therefore, when the locking member 43Y is moved between the locked position and the unlocked position, it is not necessary to move the locking member 43Y in the axial direction.

[0217] As a result, space can be saved in the axial direction.

[0218] (3) According to the image forming apparatus 1, as shown in FIGS. 9 and 10, the locking member 43Y is rotatable about the drum shaft A1 between a locked position (see FIG. 9) and an unlocked position (see FIG. 10).

[0219] Therefore, the movement range of the lock member 43Y relative to the photosensitive drum 11Y can be made small.

[0220] As a result, the drawer 4 can be prevented from becoming large due to the provision of the locking member 43Y.

[0221] (4) According to image forming apparatus 1, as shown in FIG. 9, when lock member 43Y is in the unlocked position, lock guide 431 extends in the same direction as drawer guide 411Y and is connected to drawer guide 411Y.

[0222] Therefore, when the drum cartridge 5Y is attached to the drawer 4 with the locking member 43Y positioned in the unlocked position, one end of the photosensitive drum 11Y in the axial direction can be guided by the drawer guide 411Y and the locking guide 431, allowing it to be smoothly fitted into the locking member 43Y.

[0223] Furthermore, as shown in FIG. 10, when the lock member 43Y is in the locked position, the lock guide 431 extends in a direction intersecting with the direction in which the drawer guide 411Y extends.

[0224] Therefore, when the drum cartridge 5Y is attached to the drawer 4 and the locking member 43Y is in the locked position, one end of the photosensitive drum 11Y in the axial direction can be locked to the drawer 4 by the locking guide 431.

[0225] (5) According to the image forming apparatus 1, as shown in FIG. 9, when the drum cartridge 5Y is attached to the drawer 4 and the locking member 43Y is in the locked position, the locking portion 432 is positioned between one end of the photosensitive drum 11Y and the drawer guide 411Y.

[0226] With this, when the drum cartridge 5Y is attached to the drawer 4 and the locking member 43Y is in the locked position, one end of the photosensitive drum 11Y in the axial direction can be locked to the drawer 4 by the locking portion 432.

[0227] (6) According to the image forming apparatus 1, as shown in Fig. 9, the locking member 43Y has a pressing member 434. When the drum cartridge 5Y is attached to the drawer 4, the pressing member 434 presses one end of the photosensitive drum 11Y toward the positioning plate 42A.

[0228] This makes it possible to press one end of the photosensitive drum 11Y toward the positioning plate 42A by utilizing the locking member 43Y.

[0229] (7) According to the image forming apparatus 1, as shown in FIG. 6, the lever 44Y is located outside the outer surface S21 of the side plate 41A.

[0230] Therefore, an operator can operate the lock member 43Y from the outside of the side plate 41A.

[0231] As a result, the operator can smoothly move the lock member 43Y.

[0232] (8) According to the image forming apparatus 1, as shown in FIGS. 6 and 7, when the locking member 43Y is in the locked position and the lever 44Y is in the first position, the lever 44Y is locked with respect to the side plate 41A.

[0233] Therefore, the lever 44Y can be used to lock the locking member 43Y in the locked position.

[0234] (9) According to the image forming device 1, as shown by the phantom lines in FIG. 6, when the drawer 4 is positioned at the outer position and the lever 44Y is positioned at the second position, when the drawer 4 moves from the outer position to the inner position, the lever 44Y abuts against the abutment portion of the main housing 2.

[0235] This makes it possible to prevent the drawer 4 from being positioned at the inner position when the lever 44Y is positioned at the second position.

[0236] Therefore, when the worker moves the drawer 4 from the outer position to the inner position, the worker can be prompted to place the lock member 43Y in the lock position and the lever 44Y in the first position.

[0237] (10) According to the image forming device 1, as shown in FIG. 11, when the drum cartridge 5Y is attached to the drawer 4 and the lever 44Y is in the second position, the lever 44Y covers at least a portion of the coupling 111Y in the axial direction of the photosensitive drum 11Y.

[0238] Therefore, if the drawer 4 is located at the inner position while the lever 44Y is located at the second position, the main body coupling can be prevented from fitting into the coupling 111Y by the lever 44Y.

[0239] As a result, it is possible to prevent image formation from being started in a state in which the photosensitive drum 11Y is not locked in the drawer 4.

[0240] 8. Variations (1) The image forming apparatus 1 does not have to include the drum cartridges 5Y, 5M, and 5C. The image forming apparatus 1 may be dedicated to printing monochrome images.

[0241] (2) The locking member 43Y may be movable linearly. [Explanation of symbols]

[0242] 1. Image forming device 4 Drawer 5Y drum cartridge 6Y Toner Cartridge 11Y Photosensitive drum 23 Positioning member 41A side plate 42A Positioning plate 43Y Locking member 44Y Lever 111Y Coupling 411Y Drawer Guide 412Y through hole 413Y Hole 421Y Recess 422 Positioned part 431 Lock Guide 432 Rock Department 433 Through Hole 434 Pressing member 435 Spring 441A 1st end 441B 2nd end 442A Protrusion A1 Drum shaft A11 1st axis A12 2nd axis S21 Exterior S22 Inside

Claims

1. A main body housing; a drum cartridge including a photosensitive drum; a toner cartridge detachably attached to the drum cartridge; a drawer movable between an inner position located within the main body housing and an outer position located outside the main body housing, the drum cartridge being detachably attached to the drawer, the drawer including a locking member movable between a locking position for locking the photosensitive drum to the drawer and an unlocking position for unlocking the photosensitive drum to the drawer when the drum cartridge is attached to the drawer; Equipped with The locking member has a disk shape, A lock guide extending in a radial direction of the lock member; the locking member has a circular through hole located at a center thereof, the through hole being located within the locking guide.

2. A main body housing, a drum cartridge including a photosensitive drum; a toner cartridge detachably attached to the drum cartridge; a drawer movable between an inner position located within the main body housing and an outer position located outside the main body housing, the drum cartridge being detachably attached to the drawer, the drawer including a locking member movable between a locking position for locking the photosensitive drum to the drawer and an unlocking position for unlocking the photosensitive drum to the drawer when the drum cartridge is attached to the drawer; Equipped with The drawer includes: a positioning plate that contacts one end of the photosensitive drum when the drum cartridge is attached to the drawer to determine a position of the photosensitive drum; The locking member is an image forming apparatus including a pressing member that presses the one end of the photosensitive drum toward the positioning plate when the drum cartridge is attached to the drawer;

3. 3. The image forming apparatus according to claim 2, wherein the locking member has a spring that presses the pressing member toward the one end of the photosensitive drum when the drum cartridge is attached to the drawer.

4. The positioning plate is a recess into which the one end of the photosensitive drum fits when the drum cartridge is attached to the drawer, 4. The image forming apparatus according to claim 2, wherein the pressing member presses the one end of the photosensitive drum toward the recess of the positioning plate in a state in which the drum cartridge is attached to the drawer.

5. The main body housing includes: a positioning member for positioning the positioning plate to the main body housing when the drawer is located at the inner position; The positioning plate is The image forming apparatus according to claim 2 , further comprising a positioned portion that comes into contact with the positioning member when the drawer is located at the inner position.

6. The positioning member has a cylindrical shape, The image forming apparatus according to claim 5 , wherein the positioned portion is a notch into which the positioning member fits when the drawer is located at the inner position.

7. A main body housing, a drum cartridge including a photosensitive drum; a toner cartridge detachably attached to the drum cartridge; a drawer movable between an inner position located within the main body housing and an outer position located outside the main body housing, the drum cartridge being detachably attached to the drawer, the drawer including a locking member movable between a locking position for locking the photosensitive drum to the drawer and an unlocking position for unlocking the photosensitive drum to the drawer when the drum cartridge is attached to the drawer; Equipped with The drawer includes: a lever for moving the locking member between the lock position and the unlocked position, the lever being movable together with the locking member; a side plate having an inner surface facing the drum cartridge when the drum cartridge is attached to the drawer, an outer surface located on the opposite side of the drum cartridge from the inner surface when the drum cartridge is attached to the drawer, and a through hole penetrating from the inner surface to the outer surface, the locking member is positioned within the through hole of the side plate, The lever is located outside the outer surface of the side plate.

8. the lever is movable between a first position extending along the outer surface of the side plate and a second position protruding from the outer surface of the side plate when the locking member is in the locked position; When the locking member is in the locking position and the lever is in the first position, the lever is locked with respect to the side plate; 8. The image forming apparatus according to claim 7, wherein the lever is unlocked from the side plate when the locking member is in the lock position and the lever is in the second position.

9. The lever has a protrusion, The side plate has a hole. when the locking member is located at the lock position and the lever is located at the first position, the projection of the lever fits into the hole of the side plate, thereby locking the lever with respect to the side plate; 9. The image forming apparatus according to claim 8, wherein when the locking member is located at the lock position and the lever is located at the second position, the protrusion of the lever comes out of the hole of the side plate, thereby releasing the lock of the lever with respect to the side plate.

10. The main body housing includes:

10. The image forming apparatus according to claim 8, further comprising an abutment portion against which the lever abuts when the drawer is moved from the outer position to the inner position with the drawer positioned at the outer position and the lever positioned at the second position.

11. The photosensitive drum is a coupling located at one end of the photosensitive drum; The locking member is a through hole through which the coupling is exposed when the drum cartridge is attached to the drawer; 11. The image forming apparatus according to claim 8, wherein when the drum cartridge is attached to the drawer and the lever is positioned at the second position, the lever covers at least a portion of the coupling in the axial direction of the photosensitive drum.

12. When the drum cartridge is attached to the drawer and the lever is located at the second position, the lever extends in a radial direction of the photosensitive drum, The image forming apparatus according to claim 11 , wherein the lever has a first end and a second end located on an opposite side of the through hole from the first end in a direction in which the lever extends.

13. The photosensitive drum is rotatable about a drum axis extending in an axial direction, The image forming apparatus according to claim 1 , wherein the locking member is rotatable between the locked position and the unlocked position about a first shaft extending in the axial direction.

14. The photosensitive drum is rotatable about a drum axis extending in an axial direction, The image forming apparatus according to claim 1 , wherein the locking member is rotatable about the drum shaft between the locked position and the unlocked position.

15. The drawer includes: a drawer guide that guides one end of the photosensitive drum in an axial direction of the photosensitive drum when the drum cartridge is attached to the drawer; The locking member is a lock guide into which the one end of the photosensitive drum is fitted when the drum cartridge is attached to the drawer; When the locking member is in the locking position, the locking guide extends in a direction intersecting with a direction in which the drawer guide extends, The image forming apparatus according to claim 1 , wherein, when the locking member is in the unlocked position, the locking guide extends in a direction in which the drawer guide extends and is connected to the drawer guide.

16. the drawer has a drawer guide that guides one end of the photosensitive drum when the drum cartridge is attached to the drawer, The locking member is 16. The image forming apparatus according to claim 1, further comprising a locking section that locks the photosensitive drum to the drawer when the locking member is positioned at the locked position, the locking section being positioned between one end of the photosensitive drum and the drawer guide when the drum cartridge is attached to the drawer and the locking member is positioned at the locked position, and retracting from between the one end of the photosensitive drum and the drawer guide when the drum cartridge is attached to the drawer and the locking member is positioned at the unlocked position.

17. 17. An image forming apparatus as described in any one of claims 1 to 16, wherein when the toner cartridge is attached to the drum cartridge, the toner cartridge is rotatable about a second axis extending in the axial direction of the photosensitive drum between a cartridge first position in which the toner cartridge is locked to the drum cartridge and a cartridge second position in which the toner cartridge is unlocked from the drum cartridge.

Images