Cartridge System

Abstract

To provide a compatible structure and an incompatible structure for a developing cartridge and a drum cartridge, while reducing the size of the drum cartridge.SOLUTION: A cartridge system 10 comprises a first developing cartridge, a first drum cartridge, a second developing cartridge 40, and a second drum cartridge 50. The first developing cartridge includes a first housing and a first cover that covers at least part of one end of the first housing. The second developing cartridge 40 includes a second housing 41 and a second cover 47 that covers at least part of one end of the second housing. The second drum cartridge 50 includes a second drum frame 52 having a projection 52P. The second cover 47 has a recess 47H that receives the projection 52P with the second developing cartridge 40 attached to the second drum frame 52. When the first developing cartridge is attached to the second drum frame 52, the first cover is brought into contact with the projection 52P.SELECTED DRAWING: Figure 6

Description

[Technical field]

[0001] The present disclosure relates to a cartridge system including a developing cartridge and a drum cartridge to which the developing cartridge is detachably attached. [Background technology]

[0002] Conventionally, a cartridge system is known that includes a developer cartridge and a drum cartridge to which the developer cartridge is detachably attached (see Patent Document 1). The developer cartridge includes a housing that can accommodate toner and a developer roller that can rotate around a developer shaft that extends in a first direction. The drum cartridge includes a photosensitive drum that can rotate around a drum shaft that extends in the first direction, and a drum frame to which the developer cartridge is detachably attached.

[0003] The housing has a protruding portion at one end in a second direction perpendicular to the first direction, and the drum frame has a recessed portion at one end in the second direction. The protruding portion of the housing is received in the recessed portion of the drum frame, thereby enabling the developer cartridge to be attached to the drum cartridge. Also, the developer cartridge cannot be attached to a drum cartridge that does not have a recessed portion. In other words, the protruding portion of the housing and the recessed portion of the drum frame provide a compatible and incompatible structure between the developer cartridge and the drum cartridge. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2006-72284 A Summary of the Invention [Problem to be solved by the invention]

[0005] In order to reduce the size of image forming devices, it is necessary to reduce the size of drum cartridges. For example, it is possible to reduce the size of the drum cartridge in the second direction by eliminating the recess in the drum frame. However, if the recess in the drum frame is eliminated, the interchangeable and incompatible structure between the developing cartridge and the drum cartridge will be lost.

[0006] Therefore, an object of the present disclosure is to provide a structure for compatibility and non-compatibility between a developing cartridge and a drum cartridge while reducing the size of the drum cartridge in the second direction by eliminating the recess in the drum frame. [Means for solving the problem]

[0007] In order to solve the above-mentioned problems, the cartridge system of the present disclosure includes a first developing cartridge, a first drum cartridge, a second developing cartridge, and a second drum cartridge. The first developing cartridge comprises a first housing capable of containing toner, a first developing roller rotatable around a first developing axis extending in a first direction, the developing roller being located at an end of the first housing in a second direction perpendicular to the first direction, and a first cover covering at least a portion of one end of the first housing in the first direction. The first drum cartridge includes a first photosensitive drum rotatable about a first drum axis extending in the first direction, and a first drum frame to which the first developing cartridge is detachably attached. The second developing cartridge includes a second housing capable of containing toner, a second developing roller rotatable around a second developing axis extending in the first direction, and a second cover covering at least a portion of one end of the second housing in the first direction. The second drum cartridge includes a second photosensitive drum rotatable about a second drum axis extending in the first direction, and a second drum frame to which the second developing cartridge is detachably attached. The second drum frame has a protrusion, and the second cover has a recess that receives the protrusion when the second developing cartridge is attached to the second drum frame. When the first developing cartridge is attached to the second drum frame, the first cover comes into contact with the protrusion.

[0008] According to this configuration, by eliminating the recess in the drum frame, it is possible to reduce the size of the drum cartridge in the second direction, while providing a structure that allows compatibility and non-compatibility between the developing cartridge and the drum cartridge.

[0009] It is also preferable that the first cover contacts the protrusion and the first developing cartridge is not mounted to the second drum frame.

[0010] In addition, the first housing may have a first outer surface at one end in the first direction, the first cover may cover at least a portion of the first outer surface, and the second housing may have a second outer surface at one end in the first direction, and the second cover may cover at least a portion of the second outer surface.

[0011] Moreover, the first drum frame may rotatably hold the first photosensitive drum, and the second drum frame may rotatably hold the second photosensitive drum.

[0012] The recess may be a hole.

[0013] The protrusion may extend in a third direction perpendicular to the first and second directions.

[0014] The second drum frame may have a first side wall and a second side wall positioned away from the first side wall in the first direction, and the protrusion may be positioned on the first side wall.

[0015] The first developing cartridge may further include a first memory that stores information about the first developing cartridge, a first electrical contact surface electrically connected to the first memory, and a first holder that holds the first electrical contact surface, and the first cover may hold the first holder. The second developing cartridge may further include a second memory that stores information about the second developing cartridge, a second electrical contact surface electrically connected to the second memory, and a second holder that holds the second electrical contact surface, and the second cover may hold the second holder.

[0016] Moreover, the first cover may hold the first holder movably relative to the first housing, and the second cover may hold the second holder movably relative to the second housing.

[0017] Moreover, the first folder may hold the first memory, and the second folder may hold the second memory.

[0018] In addition, the second developing cartridge may further have a developing gear located at one end of the second developing roller in the first direction, and a gear cover covering at least a portion of the developing gear, and the second cover may be attached to the gear cover.

[0019] In addition, in a state in which the second developing cartridge is attached to the second drum frame, the protrusion may be located between the gear cover and a part of the second cover in the first direction. Effect of the Invention

[0020] According to the present disclosure, by eliminating the recess in the drum frame, it is possible to reduce the size of the drum cartridge in the second direction while providing a compatible and non-compatible structure between the developer cartridge and the drum cartridge. [Brief description of the drawings]

[0021] [Figure 1]FIG. 2 is a perspective view showing a first developing cartridge and a first drum cartridge. [Diagram 2] 4 is a perspective view showing a structure of one end portion of the first developing cartridge in a first direction. FIG. [Diagram 3] FIG. 2 is a perspective view showing a state in which the first developing cartridge is attached to the first drum cartridge. [Figure 4] 13 is a perspective view showing a state in which the first developing cartridge is locked to the first drum frame by a lock lever. FIG. [Diagram 5] 1A is an explanatory diagram showing the operation of the first holder relative to the first cover when the first holder is attached to the main body housing of an image forming device (not shown), and shows the state before the first holder is attached to the main body housing (a), the state in the middle of being attached to the main body housing (b), and the state after it has been attached to the main body housing (c). [Figure 6] FIG. 2 is a perspective view showing a second developing cartridge and a second drum cartridge. [Figure 7] FIG. 13 is a partial enlarged view showing a state in which the second developing cartridge is attached to the second drum cartridge. [Figure 8] 13 is a perspective view showing a state in which the protrusion comes into contact with the first cover when the first developing cartridge is attached to the second drum cartridge. FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0022] Next, an embodiment of the present disclosure will be described in detail with reference to the drawings as appropriate. As shown in FIGS. 1 and 6, the cartridge system 10 includes a first developing cartridge 20, a first drum cartridge 30, a second developing cartridge 40, and a second drum cartridge 50.

[0023] The first developing cartridge 20 is detachably attached to a first drum frame 32 of the first drum cartridge 30, which will be described later. The first developing cartridge 20 includes a first housing 21 and a first developing roller 22. The first developing roller 22 is rotatable about a first developing axis X1 extending in a first direction. The first developing roller 22 is located at one end of the first housing 21 in a second direction that intersects with the first direction. In this embodiment, the second direction is perpendicular to the first direction.

[0024] A direction intersecting the first direction and the second direction is defined as a third direction. In this embodiment, the third direction is perpendicular to the first direction and the second direction.

[0025] The first housing 21 is capable of containing toner. The first housing 21 has a first outer surface F1 at one end of the first housing 21 in the first direction. The first developing roller 22 is a roller that supplies toner to a first photosensitive drum 31, which will be described later.

[0026] 2, the first developing cartridge 20 further includes a first developing gear 23, a first gear cover 24, a first memory (not shown), a first electrical contact surface 25, a first holder 26, and a first cover 27. The first developing gear 23 is a gear for driving the first developing roller 22. The first developing gear 23 is located at one end of the first developing roller 22 in the first direction. The first gear cover 24 is a cover that covers at least a part of the first developing gear 23. The first gear cover 24 is located on the first outer surface F1 of the first housing 21.

[0027] The first memory stores development information related to the first developing cartridge 20. Examples of the development information include the remaining amount of toner in the first developing cartridge 20 and the life of the first developing roller 22. The substrate 25A has a first surface and a second surface opposite to the first surface. The first electrical contact surface 25 is located on the first surface of the substrate 25A. As an example, the first memory is located on the second surface of the substrate 25A. The first electrical contact surface 25 is electrically connected to the first memory by wiring. The first memory may be electrically connected to the substrate 25A and the first electrical contact surface 25 by wiring, and may be located at a position away from the substrate 25A and the first electrical contact surface 25.

[0028] 2 and 5, the first holder 26 includes a holding member 26A, a reciprocating member 26B, and a spring (not shown). The holding member 26A is a member that holds the first electrical contact surface 25 and the first memory. The first memory does not have to be held by the holding member 26A. The spring is a coil spring that is located between the holding member 26A and the reciprocating member 26B. The spring biases the reciprocating member 26B in a direction away from the first electrical contact surface 25.

[0029] 2, the first cover 27 covers at least a portion of the first outer surface F1 of the first housing 21 in the first direction. The first cover 27 has a holder holding portion 27A and an attachment portion 27B. The holder holding portion 27A holds the first holder 26 movably in the second and third directions relative to the first housing 21. The attachment portion 27B is attached to the first gear cover 24 by a screw 90.

[0030] 1, the attachment portion 27B has a bottom surface B1. The bottom surface B1 has a first surface 27C that is perpendicular to the third direction, and a second surface 27D that is farther away from the first developing roller 22 than the first surface 27C. The second surface 27D faces in a different direction from the first surface 27C.

[0031] By configuring the first developing cartridge 20 as described above, while the first developing cartridge 20 is being mounted to the main body housing 60 of the image forming apparatus (not shown), the first holder 26 moves relative to the first housing 21 as shown in Figures 5(a) to (c). As shown in Figure 5(a), before the first developing cartridge 20 is mounted to the main body housing 60, the first holder 26 is in a state in which the holding member 26A and the advancing / retracting member 26B are separated to the maximum extent by the spring.

[0032] 5(b), when the first developer cartridge 20 is in the process of being attached to the main body housing 60, the holding member 26A and the advancing / retracting member 26B of the first holder 26 are pressed by a part of the main body housing 60. As a result, the spring is compressed, and the first electrical contact surface 25 approaches the advancing / retracting member 26B.

[0033] As shown in FIG. 5(c), when the first developing cartridge 20 is attached to the main body housing 60, the end of the holding member 26A of the first holder 26 fits into the recess 62 of the main body housing 60. As a result, the first holder 26 is positioned in the main body housing 60, and the first electrical contact surface 25 comes into contact with the contact 61 of the main body housing 60. The spring in the state of FIG. 5(c) is compressed more than the spring in the state of FIG. 5(a). As a result, the elastic force of the spring presses the first electrical contact surface 25 against the contact 61 of the main body housing 60.

[0034] Returning to FIG. 1, the first drum cartridge 30 includes a first photosensitive drum 31 and a first drum frame 32. The first photosensitive drum 31 is rotatable about a first drum axis X2 extending in the first direction. The first photosensitive drum 31 is located at one end of the first drum frame 32 in the second direction.

[0035] The first drum frame 32 has a first side wall W1, a second side wall W2, and a bottom wall BW1. The first drum frame 32 rotatably holds the first photosensitive drum 31. The second side wall W2 is located away from the first side wall W1 in the first direction. The bottom wall BW1 extends in the first direction. The bottom wall BW1 connects the first side wall W1 and the second side wall W2.

[0036] 3, the first developing cartridge 20 can be attached to the first drum cartridge 30. When the first developing cartridge 20 is attached to the first drum cartridge 30, the bottom surface B1 of the first cover 27 faces the first side wall W1 of the first drum frame 32.

[0037] As shown in FIG. 4, the first drum cartridge 30 further includes a lock lever L1. The lock lever L1 is rotatable between a locked position and an unlocked position about a lock axis X5 extending in the first direction. When the lock lever L1 is in the locked position as shown in FIG. 4, a claw N1 of the lock lever L1 comes into contact with the protruding portion 28 of the first developing cartridge 20. As a result, the lock lever L1 locks the first developing cartridge 20 to the first drum frame 32.

[0038] Next, the second developing cartridge 40 and the second drum cartridge 50 will be described with reference to Figures 6 and 7. The second drum cartridge 50 has the same configuration as the first drum cartridge 30, except that the second drum frame 52 has a protrusion 52P. The second developing cartridge 40 has the same configuration as the first developing cartridge 20, except that the second cover 47 has a recess 47H that receives the protrusion 52P.

[0039] As shown in Fig. 6, the second developing cartridge 40 is detachably attached to a second drum frame 52 (described later) of the second drum cartridge 50. The second developing cartridge 40 includes a second housing 41 and a second developing roller 42. The second developing roller 42 is rotatable about a second developing axis X3 extending in the first direction. The second developing roller 42 is located at one end of the second housing 41 in the second direction intersecting with the first direction.

[0040] The second housing 41 is capable of containing toner. The second housing 41 has a second outer surface F2 at one end in the first direction. The second developing roller 42 is a roller that supplies toner to a second photosensitive drum 51, which will be described later.

[0041] The second developing cartridge 40 further includes a second developing gear (not shown) as a developing gear, a second gear cover 44 as a gear cover, a second memory (not shown), a second electrical contact surface 45 (see FIG. 7), a second holder 46, and a second cover 47. The second developing gear is a gear for driving the second developing roller 42. The second developing gear is located at one end of the second developing roller 42 in the first direction, similar to the first developing gear 23. The second gear cover 44 is a cover that covers at least a part of the second developing gear. The second gear cover 44 is located on the second outer surface F2 of the second housing 41.

[0042] The second memory stores development information related to the second development cartridge 40. Examples of the development information include the remaining amount of toner in the second development cartridge 40 and the life of the second development roller 42. The second electrical contact surface 45 is electrically connected to the second memory.

[0043] The configuration of the second holder 46 is the same as that of the first holder 26, so a description thereof will be omitted. The second cover 47 covers at least a portion of the second outer surface F2 of the second housing 41 in the first direction. The second cover 47 has a holder holding portion 47A and an attachment portion 47B. The holder holding portion 47A holds the second holder 46 movably in the second and third directions relative to the second housing 41. The operation of the second holder 46 when mounting the second holder 46 to the main housing 60 is the same as that of the first holder 26, so a description thereof will be omitted.

[0044] The mounting portion 47B is attached to the second gear cover 44 by a screw 90. The mounting portion 27B has a bottom surface B2. The bottom surface B2 has a recess 47H. The bottom surface B2 has a first surface 47C perpendicular to the third direction and a second surface 47D that is farther away from the second developing roller 42 than the first surface 27C. The second surface 47D extends at a slightly different angle than the first surface 47C. The recess 47H is formed across the first surface 47C and the second surface 47D. In this embodiment, the recess 47H is a notch formed in the second cover 47.

[0045] The second drum cartridge 50 includes a second photosensitive drum 51 and a second drum frame 52. The second photosensitive drum 51 is rotatable about a second drum axis X4 extending in the first direction. The second photosensitive drum 51 is located at one end of the second drum frame 52 in the second direction.

[0046] The second drum frame 52 has a first side wall W3, a second side wall W4, a bottom wall BW2, and a protrusion 52P. The second drum frame 52 rotatably holds the second photosensitive drum 51. The second side wall W4 is located away from the first side wall W3 in the first direction. The bottom wall BW2 extends in the second direction. The bottom wall BW2 connects the first side wall W3 and the second side wall W4.

[0047] The protrusion 52P is located on the first side wall W3. The protrusion 52P protrudes in the third direction away from the bottom wall BW2. In this embodiment, the protrusion 52P is a part of the first side wall W3. More specifically, the protrusion 52P is integrally formed with the first side wall W3.

[0048] 7, the second developing cartridge 40 can be attached to the second drum frame 52. When the second developing cartridge 40 is attached to the second drum frame 52, the protrusion 52P is received in the recess 47H of the second cover 47. At this time, the protrusion 52P is positioned between the second gear cover 44 and the mounting portion 47B of the second cover 47 in the first direction.

[0049] As shown in FIG. 8, the second drum cartridge 50 further includes a lock lever L2. The lock lever L2 has the same configuration as the lock lever L1, and therefore a description thereof will be omitted. When the first developing cartridge 20 is attached to the second drum frame 52, the first cover 27 comes into contact with the protrusion 52P, and the first developing cartridge 20 cannot be attached to the second drum frame 52. In this state, the claw N2 of the lock lever L2 cannot be engaged with the protrusion 48 of the first developing cartridge 20, and the first developing cartridge 20 cannot be locked to the second drum frame 52.

[0050] As described above, the following effects can be obtained in this embodiment. The second developing cartridge 40 has a recess 47H in the second cover 47. When the second developing cartridge 40 is attached to the second drum cartridge 50, the protrusion 52P of the second drum cartridge 50 is received in the recess 47H of the second cover 47. As a result, the second developing cartridge 40 can be attached to the second drum cartridge 50.

[0051] On the other hand, even if an attempt is made to attach the first developing cartridge 20 to the second drum cartridge 50, the first cover 27 comes into contact with the protrusion 52P. Therefore, the first developing cartridge 20 cannot be attached to the second drum cartridge 50. This makes it possible to provide a compatible and incompatible structure between the developing cartridge and the drum cartridge while reducing the size of the drum cartridge in the second direction by eliminating the recess in the drum frame.

[0052] The present disclosure is not limited to the above-described embodiment, but can be used in various forms as exemplified below. In the above embodiment, the recess 47H is a notch, but the recess 47H may be a hole that penetrates or does not penetrate the second cover 47. Also, in the above embodiment, the attachment portion 47B covers the recess 47H in the first direction, but the attachment portion 47B does not have to cover the recess 47H.

[0053] The elements described in the above-mentioned embodiment and modified examples may be implemented in any combination. [Explanation of symbols]

[0054] 10 Cartridge System 20 First developing cartridge 21 1st cabinet 22 First developing roller 27 First Cover 30 1st drum cartridge 31 First photosensitive drum 32 First Drum Frame 40 2nd Developer Cartridge 41 Second cabinet 42 Second developing roller 47 2nd Cover 47H Recess 50 2nd drum cartridge 51 Second photosensitive drum 52 Second Drum Frame 52P protrusion X1 First development shaft X2 First drum shaft X3 2nd development shaft X4 Second drum shaft

Claims

1. A first developer cartridge, a first housing capable of containing toner; a first developing roller rotatable about a first developing shaft extending in a first direction, the first developing roller being located at one end of the first housing in a second direction perpendicular to the first direction; a first developing cartridge including a first cover that covers at least a portion of one end of the first housing in the first direction; A first drum cartridge, a first photosensitive drum rotatable about a first drum axis extending in the first direction; a first drum cartridge including a first drum frame to which the first developing cartridge is detachably attached; A second developer cartridge, a second housing capable of containing toner; a second developing roller rotatable about a second developing shaft extending in the first direction, the second developing roller being located at one end of the second housing in a second direction perpendicular to the first direction; a second cover that covers at least a portion of one end of the second housing in the first direction; A second drum cartridge, a second photosensitive drum rotatable about a second drum axis extending in the first direction; A cartridge system including a second drum cartridge including a second drum frame to which the second developing cartridge is detachably attached, The second drum frame has a protrusion, the second cover has a recess for receiving the protrusion when the second developing cartridge is attached to the second drum frame, When the first developing cartridge is attached to the second drum frame, the first cover comes into contact with the protrusion, The cartridge system according to claim 1, wherein the recess is a hole.

2. 2. The cartridge system according to claim 1, wherein the first cover is in contact with the protrusion and the first developing cartridge is not mounted on the second drum frame.

3. the first housing has a first outer surface at one end in the first direction; The first cover covers at least a portion of the first outer surface, the second housing has a second outer surface at one end in the first direction; 3. The cartridge system according to claim 1, wherein the second cover covers at least a portion of the second outer surface.

4. the first drum frame rotatably holds the first photosensitive drum, 4. The cartridge system according to claim 1, wherein the second drum frame rotatably holds the second photosensitive drum.

5. 5. The cartridge system according to claim 1, wherein the projection projects in a third direction intersecting the first direction and the second direction.

6. A first developing cartridge, a first housing capable of containing toner; a first developing roller rotatable about a first developing shaft extending in a first direction, the first developing roller being located at one end of the first housing in a second direction perpendicular to the first direction; a first developing cartridge including a first cover that covers at least a portion of one end of the first housing in the first direction; A first drum cartridge, a first photosensitive drum rotatable about a first drum axis extending in the first direction; a first drum cartridge including a first drum frame to which the first developing cartridge is detachably attached; A second developer cartridge, a second housing capable of containing toner; a second developing roller rotatable about a second developing shaft extending in the first direction, the second developing roller being located at one end of the second housing in a second direction perpendicular to the first direction; a second cover that covers at least a portion of one end of the second housing in the first direction; A second drum cartridge, a second photosensitive drum rotatable about a second drum axis extending in the first direction; A cartridge system including a second drum cartridge including a second drum frame to which the second developing cartridge is detachably attached, The second drum frame has a protrusion, the second cover has a recess for receiving the protrusion when the second developing cartridge is attached to the second drum frame, When the first developing cartridge is attached to the second drum frame, the first cover comes into contact with the protrusion, The second drum frame is A first side wall; a second side wall positioned away from the first side wall in the first direction, The protrusion is located on the first side wall.

7. A first developing cartridge, a first housing capable of containing toner; a first developing roller rotatable about a first developing shaft extending in a first direction, the first developing roller being located at one end of the first housing in a second direction perpendicular to the first direction; a first developing cartridge including a first cover that covers at least a portion of one end of the first housing in the first direction; A first drum cartridge, a first photosensitive drum rotatable about a first drum axis extending in the first direction; a first drum cartridge including a first drum frame to which the first developing cartridge is detachably attached; A second developer cartridge, a second housing capable of containing toner; a second developing roller rotatable about a second developing shaft extending in the first direction, the second developing roller being located at one end of the second housing in a second direction perpendicular to the first direction; a second cover that covers at least a portion of one end of the second housing in the first direction; A second drum cartridge, a second photosensitive drum rotatable about a second drum axis extending in the first direction; A cartridge system including a second drum cartridge including a second drum frame to which the second developing cartridge is detachably attached, The second drum frame has a protrusion, the second cover has a recess for receiving the protrusion when the second developing cartridge is attached to the second drum frame, When the first developing cartridge is attached to the second drum frame, the first cover comes into contact with the protrusion, The first developing cartridge is a first memory that stores information about the first developing cartridge; a first electrical contact electrically connected to the first memory; a first holder for holding the first electrical contact surface; the first cover holds the first holder, The second developing cartridge is a second memory that stores information about the second developing cartridge; a second electrical contact electrically connected to the second memory; a second holder for holding the second electrical contact surface; The cartridge system according to claim 1, wherein the second cover holds the second holder.

8. the first cover holds the first holder movably relative to the first housing; The cartridge system according to claim 7 , wherein the second cover movably holds the second holder with respect to the second housing.

9. the first holder holds the first memory; 9. A cartridge system according to claim 7, wherein the second holder holds the second memory.

10. A first developing cartridge, a first housing capable of containing toner; a first developing roller rotatable about a first developing shaft extending in a first direction, the first developing roller being located at one end of the first housing in a second direction perpendicular to the first direction; a first developing cartridge including a first cover that covers at least a portion of one end of the first housing in the first direction; A first drum cartridge, a first photosensitive drum rotatable about a first drum axis extending in the first direction; a first drum cartridge including a first drum frame to which the first developing cartridge is detachably attached; A second developer cartridge, a second housing capable of containing toner; a second developing roller rotatable about a second developing shaft extending in the first direction, the second developing roller being located at one end of the second housing in a second direction perpendicular to the first direction; a second cover that covers at least a portion of one end of the second housing in the first direction; A second drum cartridge, a second photosensitive drum rotatable about a second drum axis extending in the first direction; A cartridge system including a second drum cartridge including a second drum frame to which the second developing cartridge is detachably attached, The second drum frame has a protrusion, the second cover has a recess for receiving the protrusion when the second developing cartridge is attached to the second drum frame, When the first developing cartridge is attached to the second drum frame, the first cover comes into contact with the protrusion, The second developing cartridge is a developing gear located at one end of the second developing roller in the first direction; a gear cover that covers at least a part of the developing gear, A cartridge system, wherein the second cover is attached to the gear cover.

11. A cartridge system according to claim 10 , wherein when the second developing cartridge is attached to the second drum frame, the protrusion is positioned between the gear cover and a portion of the second cover in the first direction.

Images