Developing cartridge

Abstract

To provide a developing cartridge having a new structure to which a lever cover can be attached to a bearing.SOLUTION: A bearing 80 has a protrusion 822 protruding from a direction which intersects with a first direction. A lever cover 70 has a hole 72 in which the protrusion 822 is inserted. The protrusion 822 is inserted in the hole 72 so that the lever cover 70 is prevented from removing from the bearing 80 in the first direction. The lever cover 70 can be thus attached to the bearing 80.SELECTED DRAWING: Figure 6

Description

[Technical field]

[0001] The present disclosure relates to a developer cartridge. [Background technology]

[0002] Conventionally, electrophotographic image forming apparatuses such as laser printers and LED printers are known. A developer cartridge is used in the image forming apparatus. The developer cartridge has a developer roller for supplying a developer. A conventional image forming apparatus is described in, for example, Patent Document 1.

[0003] The developing cartridge of Patent Document 1 is attached to a drum cartridge. The drum cartridge has a photosensitive drum. When the developing cartridge is attached to the drum cartridge, the photosensitive drum and the developing roller come into contact with each other. Then, the drum cartridge with the developing cartridge attached is attached to an image forming device. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2022-117103 A Summary of the Invention [Problem to be solved by the invention]

[0005] The image forming apparatus may perform a so-called separation operation, which temporarily separates the developing roller from the photosensitive drum. The developing cartridge may have a lever that receives a driving force from the image forming apparatus during the separation operation. The lever is movable relative to the casing of the developing cartridge. In this case, the developing cartridge has a lever cover that covers a part of the lever.

[0006] The lever cover engages with a bearing attached to the casing of the developer cartridge. Specifically, a protrusion on the lever cover is inserted into a recess on the bearing. However, a new structure that allows the lever cover to be attached to the bearing is required.

[0007] An object of the present disclosure is to provide a developing cartridge having a new structure that allows a lever cover to be attached to a bearing. [Means for solving the problem]

[0008] A first disclosure of the present application is a developing cartridge comprising: a developing roller extending in a first direction; a casing capable of containing a developer, the developing roller being located at one end of the casing in the first direction, the developing roller being located at one end of the casing in the first direction, the developing roller being supported by a bearing; a lever located at one end of the casing in the first direction, the lever extending in a third direction intersecting the first direction and the second direction and movable relative to the casing; and a lever cover attached to one end of the casing in the first direction, the lever cover holding the lever between the bearing and the lever cover, the bearing having a protrusion protruding in a direction intersecting the first direction, and the lever cover having a hole into which the protrusion is inserted.

[0009] A second disclosure of the present application is the developing cartridge of the first disclosure, characterized in that the hole is a through hole penetrating the lever cover.

[0010] A third disclosure of the present application is the developing cartridge of the second disclosure, characterized in that the protrusion extends in the third direction, and the hole penetrates the lever cover in the third direction.

[0011] A fourth disclosure of the present application is the developing cartridge according to any one of the first to third disclosures, further comprising a first screw that fixes the lever cover to the casing.

[0012] A fifth disclosure of the present application is the developing cartridge of the fourth disclosure, characterized in that the lever is positioned between the hole and the first screw in the second direction.

[0013] A sixth disclosure of the present application is a developing cartridge according to any one of the first to fifth disclosures, characterized in that the casing has a first boss extending in the first direction, and the lever cover has an insertion hole into which the first boss is inserted.

[0014] The seventh disclosure of the present application is a developing cartridge as disclosed in the sixth disclosure, characterized in that the hole is located at one end of the lever cover in the second direction, and the insertion hole is located at the other end of the lever cover in the second direction.

[0015] An eighth disclosure of the present application is a developer cartridge including a developer roller extending in a first direction, a casing capable of accommodating a developer, the casing having the developer roller positioned at one end in a second direction intersecting with the first direction, a bearing attached to one end of the casing in the first direction, the bearing supporting the developer roller, a lever positioned at one end of the casing in the first direction, the lever extending in a third direction intersecting with the first direction and the second direction and movable relative to the casing, and a lever cover attached to one end of the casing in the first direction, the lever cover holding the lever between the lever cover and the bearing, the bearing including a first engagement plate intersecting with the first direction, a first arm extending from an end of both ends of the first engagement plate in the second direction, the end farther from the developer roller, in a direction away from the lever cover in the first direction, and a lever cover supporting the lever in the first direction. and a second arm extending in a direction away from the lever cover in the first direction from an end of the first engagement plate that is closer to one end of the lever in the third direction, of both ends of the first engagement plate in the third direction and a third direction intersecting the second direction, and the lever cover has a second engagement plate that intersects the first direction, a third arm extending in a direction away from the bearing in the first direction from an end of the second engagement plate that is closer to the developing roller, of both ends of the second engagement plate in the second direction, and a fourth arm extending in a direction away from the bearing in the first direction from an end of the second engagement plate that is closer to the other end of the lever in the third direction, of both ends of the second engagement plate in the third direction, and a surface of the first engagement plate that is closer to the first arm and the second arm and a surface of the second engagement plate that is closer to the third arm and the fourth arm face each other in the first direction.

[0016] A ninth disclosure of the present application is the developing cartridge of the eighth disclosure, further comprising a first screw that fixes the lever cover to the casing.

[0017] A tenth disclosure of the present application is the developing cartridge of the ninth disclosure, wherein the lever is located between the second engagement plate and the first screw in the second direction.

[0018] An eleventh disclosure of the present application is a developing cartridge according to any one of the eighth to tenth disclosures, characterized in that the casing has a first boss extending in the first direction, and the lever cover has an insertion hole into which the first boss is inserted.

[0019] The 12th disclosure of the present application is the developing cartridge of the 11th disclosure, characterized in that the second engagement plate is located at one end of the lever cover in the second direction, and the insertion hole is located at the other end of the lever cover in the second direction.

[0020] A thirteenth disclosure of the present application is the developing cartridge according to any one of the first to twelfth disclosures, further comprising a second screw that fixes the bearing to the casing.

[0021] A 14th disclosure of the present application is a developing cartridge according to any one of the 1st to 13th disclosures, characterized in that the casing has a filling hole for filling developer and a cap covering the filling hole, and the lever cover covers the filling hole and the cap.

[0022] A fifteenth disclosure of the present application is the developing cartridge according to any one of the first to fourteenth disclosures, characterized in that the bearing is made of conductive resin.

[0023] A 16th disclosure of the present application is a developing cartridge according to any one of the 1st to 15th disclosures, further comprising a supply roller extending in the first direction and contacting the developing roller, and the bearing supports the supply roller.

[0024] A 17th disclosure of the present application is a developing cartridge according to any one of the 1st to 16th disclosures, further comprising a second boss that is movable together with the casing and extends in the first direction, the lever having one end that is one end of the lever and functions as a force point, the other end that is the other end of the lever and functions as a point of action, an axis portion located between the one end and the other end and functions as a fulcrum, and a first hole into which the second boss fits, the lever is rotatable about the axis portion when the one end receives a driving force, a dimension of the first hole in the second direction is larger than a dimension of the boss in the second direction, and when the casing moves in the second direction relative to the lever, the boss moves in the second direction inside the first hole.

[0025] The 18th disclosure of the present application is the developing cartridge of the 17th disclosure, wherein the developing cartridge is used together with a drum cartridge, the drum cartridge having a photosensitive drum and a drum frame in which the developing cartridge can be mounted, and when the one end receives a driving force while the developing cartridge is mounted on the drum frame, the lever rotates about the shaft portion, and the other end presses the casing, thereby moving the casing relative to the lever in the second direction and away from the photosensitive drum. Effect of the Invention

[0026] According to the first disclosure of the present application, by inserting the projection of the bearing into the hole of the lever cover, it is possible to prevent the lever cover from coming off the bearing in the first direction. This makes it possible to attach the lever cover to the bearing.

[0027] According to the eighth disclosure of the present application, by engaging the first engagement plate of the bearing with the second engagement plate of the lever cover, it is possible to prevent the lever cover from coming off the bearing in the first direction. This makes it possible to attach the lever cover to the bearing. [Brief description of the drawings]

[0028] [Figure 1] FIG. 2 is a perspective view of the developing cartridge and the drum cartridge. [Diagram 2] FIG. [Diagram 3] FIG. 2 is a cross-sectional view of the developing cartridge. [Figure 4] FIG. 2 is a view of the developing cartridge as viewed from the first outer surface side. [Diagram 5] 2 is a perspective view of the vicinity of a first outer surface of the developing cartridge. FIG. [Figure 6] 2 is an exploded perspective view of the vicinity of a first outer surface of the developing cartridge. FIG. [Figure 7] FIG. 4 is a perspective view of a first lever. [Figure 8] FIG. [Figure 9] FIG. [Figure 10] FIG. 2 is a diagram of the developing cartridge and the drum cartridge viewed in a first direction. [Figure 11] 11 is a cross-sectional view of the developing cartridge and the drum cartridge in FIG. 10 taken along a plane perpendicular to a first direction. [Figure 12] 11 is a view of the developing cartridge and the photosensitive drum when a separating operation is not being performed, as viewed in a first direction. FIG. [Figure 13] 11 is a view of the developing cartridge and the photosensitive drum when a separating operation is performed, viewed in a first direction. FIG. [Figure 14] 11 is a cross-sectional view of the developing cartridge and the drum cartridge when a separating operation is performed, taken along a plane perpendicular to the first direction. FIG. [Figure 15] FIG. 11 is a perspective view of a bearing according to a second embodiment. [Figure 16] FIG. 11 is a perspective view of a lever cover according to a second embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0029] Hereinafter, embodiments of the present disclosure will be described with reference to the drawings.

[0030] In the following description, the direction in which the developing roller extends is referred to as the "first direction." The direction in which one end of the casing where the developing roller is located is aligned with the other end of the casing is referred to as the "second direction." The first and second directions intersect (preferably perpendicular to) each other.

[0031] <1. First embodiment> <1-1. Overview of developing cartridges and drum cartridges> First, a first embodiment of the present disclosure will be described. Fig. 1 is a perspective view of a developer cartridge 1 and a drum cartridge 2 of the first embodiment. The developer cartridge 1 and the drum cartridge 2 are used in an electrophotographic image forming apparatus. The image forming apparatus is, for example, a laser printer or an LED printer.

[0032] As shown in FIG. 1, the developing cartridge 1 is used together with a drum cartridge 2 having a photosensitive drum 92. The developing cartridge 1 is mountable to the drum cartridge 2. The developing cartridge 1 is mounted to the image forming device in a state where it is mounted to the drum cartridge 2. For example, four developing cartridges 1 can be mounted to the image forming device. The four developing cartridges 1 contain developers of different colors (for example, cyan, magenta, yellow, and black). The developer is, for example, toner. The image forming device forms an image on the surface of a printing paper by using the developer supplied from the developing cartridge 1. However, the number of developing cartridges 1 mountable to the image forming device may be one to three, or may be five or more.

[0033] <1-2. About the developing cartridge> Fig. 2 is a perspective view of the developing cartridge 1. Fig. 3 is a cross-sectional view of the developing cartridge 1 cut along a plane perpendicular to the first direction. Fig. 4 is a view of the developing cartridge 1 as viewed from a first outer surface 11 side described below. As shown in Figs. 2 to 4, the developing cartridge 1 includes a casing 10, an agitator 20, a developing roller 30, a supply roller 40, a gear portion 50, and a first lever 60.

[0034] The casing 10 is a housing capable of containing a developer. The casing 10 has a first outer surface 11 and a second outer surface 12. The first outer surface 11 is located at one end of the casing 10 in the first direction. The second outer surface 12 is located at the other end of the casing 10 in the first direction. The first outer surface 11 and the second outer surface 12 are spaced apart from each other in the first direction. The casing 10 extends in the first direction between the first outer surface 11 and the second outer surface 12, and also extends in the second direction.

[0035] A storage chamber 13 is provided inside the casing 10. The developer is stored in the storage chamber 13. The casing 10 also has an opening 14. The opening 14 is located at one end of the casing 10 in the second direction. The external space of the casing 10 and the storage chamber 13 communicate with each other via the opening 14. The casing 10 may have a handle on the outer surface of the other end in the second direction.

[0036] The agitator 20 has an agitator shaft 21 and a blade 22. The agitator shaft 21 extends along the first direction. The blade 22 spreads from the agitator shaft 21 toward the inner surface of the casing 10. That is, the blade 22 spreads from the agitator shaft 21 toward the radially outward direction. A part of the agitator shaft 21 and the blade 22 are located in the storage chamber 13 of the casing 10. An end of the agitator shaft 21 in the first direction is fixed to an agitator gear included in the gear unit 50. When the agitator gear rotates, the agitator shaft 21 and the blade 22 rotate about a rotation axis extending in the first direction. Then, the rotation of the blade 22 stirs the developer in the storage chamber 13.

[0037] The developing roller 30 is a roller that can rotate about a rotation axis that extends in the first direction. The developing roller 30 is located in the opening 14 of the casing 10. That is, the developing roller 30 is located at one end of the casing 10 in the second direction. The developing roller 30 has a developing roller main body 31 and a developing roller shaft 32. The developing roller main body 31 is a cylindrical member that extends in the first direction. For example, rubber having elasticity is used as the material of the developing roller main body 31. The developing roller shaft 32 is a cylindrical member that penetrates the developing roller main body 31 and extends in the first direction. The developing roller main body 31 is fixed to the developing roller shaft 32. The developing roller shaft 32 is conductive. The developing roller shaft 32 is made of a metal or a resin having conductivity.

[0038] The developing cartridge 1 has a bearing 80. The bearing 80 is attached to one end of the casing 10 in the first direction. Specifically, the bearing 80 is fixed to the first outer surface 11 of the casing 10 by a screw 83. The screw 83 is an example of a "second screw." The bearing 80 is plate-shaped and extends along the first outer surface 11. The bearing 80 is conductive. The material of the bearing 80 is metal or conductive resin.

[0039] One end of the developing roller shaft 32 in the first direction is supported by the bearing 80. Specifically, one end of the developing roller shaft 32 in the first direction is inserted into a first through hole (not shown) provided in the bearing 80. Also, one end of the developing roller shaft 32 in the first direction contacts the bearing 80. Therefore, the developing roller shaft 32 is electrically connected to the bearing 80.

[0040] When the drum cartridge 2 with the developer cartridge 1 attached thereto is installed in an image forming apparatus, the image forming apparatus supplies a bias voltage to the developer roller shaft 32 via the bearing 80. Then, the developer is carried on the outer circumferential surface of the developer roller body 31 due to the electrostatic force between the developer roller shaft 32 and the developer.

[0041] The other end of the developing roller shaft 32 in the first direction is fixed to a developing roller gear included in the gear portion 50. Therefore, when the developing roller gear rotates, the developing roller shaft 32 also rotates, and together with the developing roller shaft 32, the developing roller main body 31 also rotates.

[0042] The developing roller shaft 32 does not have to penetrate the developing roller body 31 in the first direction. For example, the developing roller shaft 32 may include a first developing roller shaft extending in the first direction from one end of the developing roller body 31 in the first direction, and a second developing roller shaft extending in the first direction from the other end of the developing roller body 31 in the first direction.

[0043] The supply roller 40 is a roller that can rotate about a rotation axis that extends in the first direction. The supply roller 40 is located between the agitator 20 and the developing roller 30. The supply roller 40 has a supply roller main body 41 and a supply roller shaft 42. The supply roller main body 41 is a cylindrical member that extends in the first direction. For example, elastic rubber is used as the material of the supply roller main body 41. The supply roller shaft 42 is a cylindrical member that penetrates the supply roller main body 41 and extends in the first direction. The supply roller main body 41 is fixed to the supply roller shaft 42. The supply roller shaft 42 is conductive. The supply roller shaft 42 is made of a material such as metal or a conductive resin.

[0044] One end of the supply roller shaft 42 in the first direction is supported by the bearing 80. Specifically, one end of the supply roller shaft 42 in the first direction is inserted into a second through hole (not shown) provided in the bearing 80. Also, one end of the supply roller shaft 42 in the first direction contacts the bearing 80. Therefore, the supply roller shaft 42 is electrically connected to the bearing 80.

[0045] When the drum cartridge 2 with the developer cartridge 1 attached thereto is attached to an image forming apparatus, the image forming apparatus supplies a bias voltage to the supply roller shaft 42 via the bearing 80. Then, the developer is carried on the outer circumferential surface of the supply roller main body 41 by the electrostatic force between the supply roller shaft 42 and the developer.

[0046] The other end of the supply roller shaft in the first direction is fixed to a supply roller gear included in the gear unit 50. Therefore, when the supply roller gear rotates, the supply roller shaft also rotates, and together with the supply roller shaft , the supply roller main body 41 also rotates.

[0047] The supply roller shaft 42 does not have to penetrate the supply roller body 41 in the first direction. For example, the supply roller shaft 42 may include a first supply roller shaft extending in the first direction from one end of the supply roller body 41 in the first direction, and a second supply roller shaft extending in the first direction from the other end of the supply roller body 41 in the first direction.

[0048] The outer peripheral surface of the developing roller main body 31 and the outer peripheral surface of the supply roller main body 41 are in contact with each other. The developer in the casing 10 is supplied to the developing roller 30 via the supply roller 40. The developing cartridge 1 also has a layer thickness regulating blade 35. The layer thickness regulating blade 35 shapes the developer carried on the outer peripheral surface of the developing roller main body 31 to a constant thickness. Thereafter, the developer on the outer peripheral surface of the developing roller main body 31 is supplied to a photosensitive drum 92 (described later) of the drum cartridge 2. At this time, the developer moves from the developing roller main body 31 to the photosensitive drum 92 according to the electrostatic latent image formed on the outer peripheral surface of the photosensitive drum 92. As a result, the electrostatic latent image is visualized on the outer peripheral surface of the photosensitive drum 92.

[0049] The gear portion 50 is located on the second outer surface 12 of the casing 10. The gear portion 50 has a gear cover 51, a coupling, and a plurality of gears. The gear cover 51, together with the casing 10, constitutes the housing of the developing cartridge 1. The gear cover 51 is fixed to the second outer surface 12 of the casing 10. The plurality of gears include the above-mentioned agitator gear, developing roller gear, and supply roller gear. At least some of the plurality of gears are located between the second outer surface 12 and the gear cover 51.

[0050] The coupling is exposed from a gear cover 51. When the developing cartridge 1 attached to the drum cartridge 2 is attached to an image forming apparatus, the drive shaft of the image forming apparatus is connected to the coupling. Then, the rotation of the drive shaft is transmitted to the agitator gear, the developing roller gear, and the supply roller gear via the coupling.

[0051] The multiple gears included in the gear unit 50 may transmit a rotational force by meshing of teeth, or may transmit a rotational force by friction.

[0052] The first lever 60 is located on the first outer surface 11 of the casing 10. The first lever 60 is located away from the developing roller 30 in the second direction. The first lever 60 is movable relative to the casing 10. The first lever 60 is an example of a "lever".

[0053] FIG. 5 is a perspective view of the vicinity of the first outer surface 11 of the developing cartridge 1. FIG. 6 is an exploded perspective view of the vicinity of the first outer surface of the developing cartridge 1. FIG. 7 is a perspective view of the first lever 60. As shown in FIGS. 4 to 7, the first lever 60 has one end 61, the other end 62, a shaft portion 63, and a first hole 64. The first lever 60 extends in a third direction intersecting the first direction and the second direction. The one end 61 is located at one end of the first lever 60 in the third direction. The other end 62 is located at the other end of the first lever 60 in the third direction. The one end 61 and the other end 62 are spaced apart in the third direction.

[0054] One end 61 of the first lever 60 has a first convex portion 65. The first convex portion 65 protrudes in a first direction at one end 61 of the first lever 60. Also, the first convex portion 65 protrudes at one end 61 of the first lever 60 in a direction away from the first outer surface 11 of the casing 10. The first convex portion 65 has a concave surface 66. When the developing cartridge 1 is attached to the drum cartridge 2, the concave surface 66 is recessed toward a photosensitive drum 92 of the drum cartridge 2, which will be described later.

[0055] The other end 62 of the first lever 60 has a second protrusion 67. The second protrusion 67 protrudes in a first direction at the other end 62 of the first lever 60. In addition, the second protrusion 67 protrudes from the other end 62 of the first lever 60 toward the first outer surface 11 of the casing 10.

[0056] The shaft portion 63 is located between the one end portion 61 and the other end portion 62 in the third direction. The shaft portion 63 protrudes from the first lever 60 in the first direction. The shaft portion 63 protrudes in a direction away from the first outer surface 11 of the casing 10. When the developing cartridge 1 is attached to the drum cartridge 2, the shaft portion 63 can come into contact with a drum frame 91 (described later) of the drum cartridge 2. The first lever 60 can rotate about the shaft portion 63 between a first position and a second position.

[0057] As shown in Figs. 4 to 6, the casing 10 has a pressure receiving surface 16. The pressure receiving surface 16 is located farther away from the developing roller 30 in the second direction than the other end 62 of the first lever 60. The pressure receiving surface 16 faces the other end 62 of the first lever 60 in the second direction. Specifically, the pressure receiving surface 16 faces the second protrusion 67 of the first lever 60 in the second direction.

[0058] When one end 61 of the first lever 60 receives a driving force from the image forming apparatus while the developing cartridge 1 is attached to the drum cartridge 2, the first lever 60 rotates about the shaft portion 63. As a result, the other end 62 of the first lever 60 comes into contact with the pressure receiving surface 16. At this time, the shaft portion 63 of the first lever 60 functions as a fulcrum. The one end 61 of the first lever 60 functions as a force point. The other end 62 of the first lever 60 functions as a point of action.

[0059] The first hole 64 is located between the one end 61 and the other end 62 in the third direction. The first hole 64 overlaps with the shaft portion 63 in the first direction. The first hole 64 is recessed in the first direction from a surface of the first lever 60 facing the casing 10 toward the shaft portion 63. In this embodiment, the shape of the first hole 64 is a circle centered on an axis extending in the first direction. However, the first hole 64 may be a shape other than a circle, such as an ellipse or a polygon.

[0060] 5, the bearing 80 has a boss 81. The boss 81 is an example of a "second boss." The boss 81 extends in a first direction from a surface of the bearing 80 facing the first lever 60 toward the first lever 60. The bearing 80 is fixed to the casing 10. Therefore, the boss 81 is movable together with the casing 10.

[0061] The boss 81 fits into the first hole 64 of the first lever 60. The inner diameter of the first hole 64 is larger than the outer diameter of the boss 81. That is, the dimension of the first hole 64 in the second direction is larger than the dimension of the boss 81 in the second direction. Also, the dimension of the first hole 64 in the third direction is larger than the dimension of the boss 81 in the third direction. Therefore, the first hole 64 is movable in the second direction and the third direction relative to the boss 81. Also, the first lever 60 is movable in the second direction and the third direction relative to the bearing 80 and the casing 10 within the range of the dimensional difference between the boss 81 and the first hole 64.

[0062] 5 and 6, the first lever 60 has a protrusion 68. The protrusion 68 protrudes from the periphery of the first hole 64 toward the other end of the casing 10 in the second direction. On the other hand, as shown in Fig. 6, the casing 10 has a pressing surface 15. The protrusion 68 and the pressing surface 15 face each other in the rotation direction around the developing roller 30.

[0063] The developing cartridge 1 also has a lever cover 70. The lever cover 70 is attached to one end of the casing 10 in the first direction. More specifically, the lever cover 70 is fixed to the first outer surface 11 of the casing 10. The lever cover 70 covers a part of the first lever 60. That is, a part of the first lever 60 is located between the first outer surface 11 of the casing 10 and the lever cover 70. The lever cover 70 is also located between the first convex portion 65 and the second convex portion 67 of the first lever 60 in the third direction. The first convex portion 65 and the lever cover 70 face each other in the third direction and can contact each other. This prevents the first lever 60 from coming off the lever cover 70 in the third direction. That is, the lever cover 70 holds the first lever 60 between the bearing 80 and the first lever 60 in a state in which the first lever 60 can move relative to the casing 10.

[0064] As shown in FIG. 6, the casing 10 has a filling hole 17 and a cap 18. The filling hole 17 is a hole for filling the containing chamber 13 of the casing 10 with developer. The filling hole 17 is located in the first outer surface 11 of the casing 10. Specifically, the filling hole 17 penetrates the first outer surface 11 of the casing 10 in a first direction. The shape of the filling hole 17 when viewed in the first direction is circular. The cap 18 is a lid that covers the filling hole 17. The cap 18 is detachable from the filling hole 17.

[0065] Lever cover 70 has a cap cover portion 71. Cap cover portion 71 extends in a direction intersecting the first direction. Filling hole 17 and cap 18 are covered by cap cover portion 71. That is, filling hole 17 and cap 18 are located between storage chamber 13 and cap cover portion 71 in the first direction.

[0066] <1-3. Lever cover mounting structure> Next, the mounting structure of the lever cover 70 to the casing 10 and the bearing 80 will be described.

[0067] Fig. 8 is a perspective view of the bearing 80. As shown in Fig. 8, the bearing 80 has a hook 82. The hook 82 is located at one end of the bearing 80 in the third direction. The hook 82 is located closer to the one end 61 of the first lever 60 than to the other end 62 in the third direction.

[0068] The hook 82 has an arm 821 and a protrusion 822. The arm 821 extends in the first direction from the outer surface of the bearing 80 in the first direction toward the lever cover 70. The protrusion 822 protrudes from a tip of the arm 821 in the first direction in a direction intersecting the first direction. Specifically, the protrusion 822 protrudes in the third direction from a tip of the arm 821 in the first direction. More specifically, the protrusion 822 protrudes in the third direction from a tip of the arm 821 in the first direction in a direction away from the other end 62 of the first lever 60.

[0069] FIG. 9 is a perspective view of the lever cover 70. As shown in FIG. 9, the lever cover 70 has a hole 72. The hole 72 is located at one end of the lever cover 70 in the second direction. The hole 72 is a through hole that penetrates one end of the lever cover 70 in the second direction. More specifically, the hole 72 penetrates one end of the lever cover 70 in the second direction in the third direction. The protrusion 822 of the bearing 80 is inserted into the hole 72 of the lever cover 70. This makes it possible to prevent the lever cover 70 from coming off the bearing 80 in the first direction. In addition, by providing the hole 72 in the lever cover 70 instead of the bearing 80, the hole 72 can be formed large. Therefore, the lever cover 70 can be easily attached to the bearing 80.

[0070] However, the hole 72 of the lever cover 70 does not necessarily have to be a through hole, and may be a recess into which the protrusion 822 can be inserted.

[0071] As shown in FIG. 6, the casing 10 has a boss 19. The boss 19 is an example of a "first boss". The boss 19 is a protrusion extending in a first direction. Specifically, the boss 19 extends in the first direction from the first outer surface 11 of the casing 10 toward the lever cover 70. Meanwhile, the lever cover 70 has an insertion hole 73. The insertion hole 73 is located at the other end of the lever cover 70 in the second direction. The insertion hole 73 penetrates the other end of the lever cover 70 in the second direction in the first direction. The boss 19 is inserted into the insertion hole 73. This limits the position of the lever cover 70 relative to the casing 10.

[0072] When manufacturing the developing cartridge 1, first, the bearing 80 is attached to the casing 10. Specifically, the bearing 80 is disposed on the first outer surface 11 of the casing 10, and the bearing 80 is fixed to the first outer surface 11 by the screw 83.

[0073] Next, with the lever 60 disposed between the bearing 80 and the lever cover 70, the lever cover 70 is attached to the casing 10 and the bearing 80. Specifically, first, the boss 19 of the casing 10 is inserted into the insertion hole 73 of the lever cover 70. This restricts movement of the lever cover 70 relative to the casing 10 in a direction perpendicular to the first direction. However, rotation of the lever cover 70 around the boss 19 is permitted.

[0074] Next, the protrusion 822 of the bearing 80 is inserted into the hole 72 of the lever cover 70. The protrusion 822 extends along the direction in which the lever cover 70 rotates about the boss 19. The hole 72 also penetrates the lever cover 70 along the direction in which the lever cover 70 rotates about the boss 19. For this reason, the protrusion 822 can be easily inserted into the hole 72 by rotating the lever cover 70 about the boss 19.

[0075] Inserting the protrusion 822 into the hole 72 stops the rotation of the lever cover 70 around the boss 19. Also, inserting the protrusion 822 into the hole 72 prevents the lever cover 70 from moving in the first direction relative to the casing 10 and the bearing 80. That is, the lever cover 70 is prevented from coming off in the first direction relative to the casing 10 and the bearing 80.

[0076] Thereafter, the lever cover 70 is fixed to the casing 10 by a screw 74. The screw 74 is an example of a "first screw." The screw 74 is located between the hole 72 and the insertion hole 73 in the second direction. In addition, the first lever 60 is located between the hole 72 and the screw 74 in the second direction.

[0077] <1-4. About drum cartridges> Next, the drum cartridge 2 will be described. Fig. 10 is a diagram of the developing cartridge 1 and the drum cartridge 2 viewed in a first direction. Fig. 11 is a cross-sectional view of the developing cartridge 1 and the drum cartridge 2 in Fig. 10 cut along a plane perpendicular to the first direction.

[0078] As shown in FIG. 1, the drum cartridge 2 includes a drum frame 91 and a photosensitive drum 92. The developing cartridge 1 is mounted in the drum frame 91. The photosensitive drum 92 is a cylindrical component that is rotatable about a rotation axis that extends in a first direction. The outer peripheral surface of the photosensitive drum 92 is covered with a photosensitive material. The photosensitive drum 92 is located at one end of the drum frame 91 in the second direction. When the developing cartridge 1 is mounted in the drum frame 91, the outer peripheral surface of the developing roller 30 comes into contact with the outer peripheral surface of the photosensitive drum 92. At this time, the developing roller 30 is pressed in the second direction toward the photosensitive drum 92 by an elastic member 93 provided in the drum cartridge 2.

[0079] As shown in FIGS. 1 and 10 , the drum frame 91 has a recess 911. The recess 911 is located at one end of the drum frame 91 in the first direction. The recess 911 is recessed in the second direction toward the photosensitive drum 92. When the developing cartridge 1 is attached to the drum cartridge 2, the shaft portion 63 of the first lever 60 fits into the recess 911. Then, the shaft portion 63 comes into contact with the recess 911 in the direction toward the photosensitive drum 92.

[0080] 10, the drum frame 91 has a guide surface 912. The guide surface 912 is located at one end of the drum frame 91 in the first direction. The guide surface 912 is located next to the recessed portion 911. The guide surface 912 is inclined with respect to the rotation direction about the developing roller 30. When the developing cartridge 1 is being attached to the drum cartridge 2, the guide surface 912 guides the shaft portion 63 of the first lever 60 toward the recessed portion 911.

[0081] <1-5. Installing the developing cartridge> When the developer cartridge 1 is attached to the drum cartridge 2, the developer cartridge 1 moves relative to the drum cartridge 2. This causes the developer roller 30 to approach the photosensitive drum 92. At that time, the shaft portion 63 of the first lever 60 comes into contact with the guide surface 912 of the drum frame 91. Then, with the shaft portion 63 in contact with the guide surface 912, the outer circumferential surface of the developer cartridge 1 comes into contact with the outer circumferential surface of the photosensitive drum 92.

[0082] Thereafter, while the developing roller 30 maintains contact with the photosensitive drum 92, the casing 10 of the developing cartridge 1 rotates about the developing roller 30. Specifically, the casing 10 rotates about the developing roller 30 in a direction approaching the drum frame 91. At that time, the pressing surface 15 of the casing 10 comes into contact with the protrusion 68 of the first lever 60. Then, as the casing 10 rotates, the pressing surface 15 presses the protrusion 68 toward the recess 911. Then, the shaft portion 63 of the first lever 60 moves along the guide surface 912 toward the recess 911. As a result, the shaft portion 63 is disposed in the recess 911 as shown in FIG. 10.

[0083] Thus, in the structure of this embodiment, while the developing cartridge 1 is being attached to the drum cartridge 2, the pressing surface 15 of the casing 10 presses the protrusion 68 of the first lever 60. This allows the shaft portion 63 of the first lever 60 to be pressed into the recessed portion 911. In addition, the shaft portion 63 of the first lever 60 is guided into the recessed portion 911 along the guide surface 912 of the drum frame 91. This allows the shaft portion 63 of the first lever 60 to be positioned within the recessed portion 911 with greater accuracy.

[0084] In the structure of this embodiment, the boss 81 of the bearing 80 fits into the first hole 64 of the first lever 60. This limits the range within which the first lever 60 can move relative to the casing 10. Therefore, the shaft 63 of the first lever 60 can come into contact with the guide surface 912 of the drum frame 91 while the developing cartridge 1 is being attached to the drum cartridge 2.

[0085] Furthermore, the shaft portion 63 and the first hole 64 overlap in the first direction. Therefore, by fitting the boss 81 into the first hole 64, the movement range of the first lever 60, particularly the shaft portion 63, can be limited. Therefore, while the developing cartridge 1 is being attached to the drum cartridge 2, the shaft portion 63 of the first lever 60 can be brought into contact with the guide surface 912 of the drum frame 91 with greater accuracy.

[0086] <1-6. About separation operation> After the developer cartridge 1 is mounted in the image forming apparatus while attached to the drum cartridge 2, it can perform a separation operation by a driving force supplied from the image forming apparatus. The separation operation is an operation for temporarily separating the developer roller 30 from the photosensitive drum 92. For example, when performing monochrome printing in the image forming apparatus, the developer cartridges 1 of each color other than black perform the separation operation. However, there may be cases where only the black developer cartridge 1 performs the separation operation.

[0087] Fig. 12 is a view of the developing cartridge 1 and the photosensitive drum 92 when the separating operation is not being performed, viewed in a first direction. Fig. 13 is a view of the developing cartridge 1 and the photosensitive drum 92 when the separating operation is being performed, viewed in a first direction. Note that in Figs. 12 and 13, a part of the image forming apparatus is indicated by a two-dot chain line.

[0088] As shown in FIG. 12, when the developer cartridge 1 is attached to the drum cartridge 2, the casing 10 of the developer cartridge 1 is disposed in a pressure contact position where the developer roller 30 contacts the photosensitive drum 92. The position of the first lever 60 at this time is the first position. In the first position, the other end 62 of the first lever 60 is separated from the pressure receiving surface 16. Therefore, the other end 62 of the first lever 60 does not press the pressure receiving surface 16. In addition, the shaft portion 63 of the first lever 60 contacts the recess 911 of the drum frame 91.

[0089] When performing a separating operation, the image forming apparatus applies a driving force to one end 61 of the first lever 60. Specifically, as shown in Figs. 12 and 13, the image forming apparatus has a main body cam 101. The main body cam 101 is movable in the second direction between a third position (position in Fig. 12) and a fourth position (position in Fig. 13) with respect to the frame of the image forming apparatus. When performing a separating operation, the image forming apparatus moves the main body cam 101 from the third position to the fourth position.

[0090] When the drum cartridge 2 with the developing cartridge 1 mounted thereon is mounted in the image forming apparatus, and the main body cam 101 is located at the third position, the main body cam 101 does not come into contact with the first lever 60. On the other hand, when the drum cartridge 2 with the developing cartridge 1 mounted thereon is mounted in the image forming apparatus, and the main body cam 101 is located at the fourth position, the main body cam 101 comes into contact with one end 61 of the first lever 60. More specifically, the main body cam 101 comes into contact with the concave surface 66 of the first lever 60. Then, the main body cam 101 presses the one end 61 of the first lever 60 in the second direction toward the photosensitive drum 92.

[0091] As a result, the first lever 60 rotates about the shaft portion 63 supported by the recess 911. That is, the first lever 60 rotates from the first position to the second position relative to the casing 10. Then, the other end portion 62 of the first lever 60 contacts the pressure receiving surface 16 of the casing 10. Then, the other end portion 62 of the first lever 60 presses the pressure receiving surface 16 of the casing 10 in the second direction and in a direction away from the photosensitive drum 92. As a result, the first outer surface 11 of the casing 10 moves in the second direction and in a direction away from the photosensitive drum 92 relative to the first lever 60.

[0092] The developing cartridge 1 also has a second lever (not shown). The second lever is located on the second outer surface 12 of the casing 10. When performing a separating operation, the image forming apparatus applies a driving force to the second lever directly or via a component of the drum cartridge 2. This presses the second lever in the second direction and in a direction away from the photosensitive drum 92. As a result, the second outer surface 12 of the casing 10 moves in the second direction and in a direction away from the photosensitive drum 92.

[0093] In this way, on the first outer surface 11 of the casing 10, the main body cam 101 presses the first lever 60, and the first lever 60 presses the casing 10 in a direction away from the photosensitive drum 92. Also, on the second outer surface 12 of the casing 10, the second lever is pressed in a direction away from the photosensitive drum 92. This allows the casing 10 to move in the second direction from a pressure contact position where the developing roller 30 contacts the photosensitive drum 92 to a separated position where the developing roller 30 is separated from the photosensitive drum 92.

[0094] 14 is a cross-sectional view of the developer cartridge 1 and the drum cartridge 2 when the separating operation is performed, taken along a plane perpendicular to the first direction. In FIG. 14, the position of the boss 81 when the separating operation is not performed is indicated by a two-dot chain line.

[0095] The first hole 64 of the first lever 60 is located at a position overlapping with the shaft portion 63, which is the fulcrum for the rotation of the first lever 60, in the axial direction. Therefore, even if the first lever 60 rotates about the shaft portion 63 from the first position to the second position, the position of the first hole 64 relative to the drum frame 91 does not change substantially. That is, the position of the first hole 64 relative to the drum frame 91 does not change substantially before and after the separation operation. In contrast, the boss 81 moves together with the casing 10. Therefore, the position of the boss 81 relative to the drum frame 91 moves in the second direction due to the separation operation. That is, inside the first hole 64, the boss 81 moves in the second direction from the position indicated by the two-dot chain line in FIG. 12 to the position indicated by the solid line.

[0096] However, the difference in size in the second direction between the first hole 64 and the boss 81 is greater than the distance the casing 10 moves in the second direction during the separating operation. Therefore, the boss 81 does not come into contact with the first lever 60 either before or after the separating operation. Therefore, the casing 10 can move from the pressed position to the separated position without being hindered by the first lever 60.

[0097] <2. Second embodiment> Next, a second embodiment of the present disclosure will be described. The second embodiment differs from the first embodiment only in the mounting structure of the lever cover 70 to the casing 10 and the bearing 80. Below, only the differences from the first embodiment will be described, and the same points as the first embodiment will not be described.

[0098] Fig. 15 is a perspective view of a bearing 80 of the second embodiment. As shown in Fig. 15, the bearing 80 of the second embodiment has a bearing hook 84. The bearing hook 84 is located at one end of the bearing 80 in the third direction. The bearing hook 84 is located closer to the one end 61 of the first lever 60 than to the other end 62 in the third direction.

[0099] The bearing hook 84 has a first arm 841 , a second arm 842 , and a first engagement plate 843 .

[0100] The first arm 841 and the second arm 842 extend in the first direction from the outer surface of the bearing 80 in the first direction toward the lever cover 70. The first engagement plate 843 protrudes in a direction intersecting the first direction from the tips of the first arm 841 and the second arm 842 in the first direction. The first engagement plate 843 is in the shape of a flat plate that expands in the direction intersecting the first direction.

[0101] The first arm 841 extends from an end of the first engagement plate 843 in the second direction that is farther from the developing roller 30 in a direction away from the lever cover 70 in the first direction. The second arm 842 extends from an end of the first engagement plate 843 in the third direction that is farther from one end 61 of the first lever 60 in the third direction in a direction away from the lever cover 70 in the first direction. The first arm 841 and the second arm 842 are connected to each other to form a substantially L-shaped arm.

[0102] Fig. 16 is a perspective view of a lever cover 70 of the second embodiment. As shown in Fig. 16, the lever cover 70 has a cover hook 75. The cover hook 75 is located at one end of the lever cover 70 in the second direction. The cover hook 75 is located closer to one end 61 of the first lever 60 than to the other end 62 in the third direction.

[0103] The cover hook 75 has a third arm 751 , a fourth arm 752 , and a second engagement plate 753 .

[0104] The third arm 751 and the fourth arm 752 extend in the first direction from the inner surface of the lever cover 70 in the first direction toward the bearing 80. The second engagement plate 753 protrudes in a direction intersecting with the first direction from the tips of the third arm 751 and the fourth arm 752 in the first direction. The second engagement plate 753 is in the shape of a flat plate that expands in the direction intersecting with the first direction.

[0105] The third arm 751 extends from an end of the second engagement plate 753 in the second direction that is closer to the developing roller 30 in a direction away from the bearing 80 in the first direction. The fourth arm 752 extends from an end of the second engagement plate 753 in the third direction that is farther from the other end 62 of the first lever 60 in the third direction in a direction away from the bearing 80 in the first direction. The third arm 751 and the fourth arm 752 are connected to each other to form a substantially L-shaped arm.

[0106] When manufacturing the developing cartridge 1, first, the bearing 80 is attached to the casing 10. Specifically, the bearing 80 is disposed on the first outer surface 11 of the casing 10, and the bearing 80 is fixed to the first outer surface 11 by the screw 83.

[0107] Next, the lever cover 70 is attached to the casing 10 and the bearing 80. Specifically, first, the boss 19 of the casing 10 is inserted into the insertion hole 73 of the lever cover 70. This restricts movement of the lever cover 70 relative to the casing 10 in a direction perpendicular to the first direction. However, rotation of the lever cover 70 around the boss 19 is permitted.

[0108] Next, the bearing hook 84 is engaged with the cover hook 75. As a result, of both surfaces of the first engagement plate 843 in the first direction, the surface close to the first arm 841 and the second arm 842 and of both surfaces of the second engagement plate 753 in the first direction, the surface close to the third arm 751 and the fourth arm 752 face each other in the first direction.

[0109] The bearing hook 84 and the cover hook 75 engage with each other in the rotation direction of the lever cover 70 about the boss 19. Therefore, by rotating the lever cover 70 about the boss 19, the bearing hook 84 and the cover hook 75 can be easily engaged with each other.

[0110] The engagement of the bearing hook 84 and the cover hook 75 stops the rotation of the lever cover 70 around the boss 19. Furthermore, the first engagement plate 843 and the second engagement plate 753 face each other in the first direction, preventing the lever cover 70 from moving in the first direction relative to the casing 10 and the bearing 80. In other words, the lever cover 70 is prevented from coming off in the first direction relative to the casing 10 and the bearing 80.

[0111] Thereafter, the lever cover 70 is fixed to the casing 10 by a screw 74. The screw 74 is an example of a "first screw." The screw 74 is located between the second engagement plate 753 and the insertion hole 73 in the second direction. In addition, the first lever 60 is located between the second engagement plate 753 and the screw 74 in the second direction.

[0112] As described above, in the second embodiment, the first engagement plate 843 and the second engagement plate 753 are engaged with each other, so that the lever cover 70 is prevented from coming off from the bearing 80 in the first direction. When the first engagement plate 843 and the second engagement plate 753 are engaged with each other, the bearing 80 side has two faces open other than the first arm 841 and the second arm 842, and the lever cover 70 side has two faces open other than the third arm 751 and the fourth arm 752. That is, the bearing hook 84 is open in two directions, the second direction and the third direction, and the cover hook 75 is also open in two directions, the second direction and the third direction. This allows the bearing hook 84 and the cover hook 75 to be easily engaged with each other. Therefore, the lever cover 70 can be easily attached to the bearing 80.

[0113] <3. Modifications> Although one embodiment of the present disclosure has been described above, the present disclosure is not limited to the above embodiment.

[0114] In the above embodiment, the boss 81 extends from the bearing 80. However, the boss 81 may extend from the first outer surface 11 of the casing 10.

[0115] In the above embodiment, the developing cartridge 1 is attached to the drum cartridge 2 having one photosensitive drum 92. However, the developing cartridge may be attached to a drum cartridge having multiple photosensitive drums. Also, the developing cartridge may be directly attached to the image forming apparatus.

[0116] In addition, the detailed shape of the developing cartridge 1 may differ from the shapes shown in the drawings of the present application. In addition, the elements appearing in the above-described embodiment and modified examples may be appropriately combined to the extent that no contradiction occurs. [Explanation of symbols]

[0117] 1 Developer cartridge 2 Drum Cartridge 10 Casing 17 Filling hole 18 Cap 19 Boss 20 Agitator 30 Developing roller 40 Supply roller 50 Gear section 60 First Lever 70 Lever cover 72 holes 73 Insertion hole 74 Screw 80 Bearings 83 Screw 91 Drum Frame 92 Photoconductor drum 751 3rd Arm 752 4th Arm 753 Second engagement plate 821 Arm 822 Protrusion 841 First Arm 842 Second Arm 843 First engagement plate

Claims

1. A developing cartridge, A developing roller extending in a first direction; a casing capable of accommodating a developer, the casing having the developing roller located at one end in a second direction intersecting with the first direction; a bearing attached to one end of the casing in the first direction, the bearing supporting the developing roller; a lever located at one end of the casing in the first direction, the lever extending in a third direction intersecting the first direction and the second direction and movable relative to the casing; a lever cover attached to one end of the casing in the first direction, the lever cover holding the lever between the lever cover and the bearing; Equipped with The bearing has a protrusion that protrudes in a direction intersecting the first direction, A developing cartridge, wherein the lever cover has a hole into which the protrusion is inserted.

2. 2. The developing cartridge according to claim 1, The developing cartridge, wherein the hole is a through hole penetrating the lever cover.

3. 3. The developing cartridge according to claim 2, The protrusion extends in the third direction, The developing cartridge, wherein the hole penetrates the lever cover in the third direction.

4. 2. The developing cartridge according to claim 1, A first screw that fixes the lever cover to the casing The developing cartridge further comprises:

5. 5. The developing cartridge according to claim 4, a developing cartridge, wherein the lever is located between the hole and the first screw in the second direction.

6. 2. The developing cartridge according to claim 1, The casing has a first boss extending in the first direction, The lever cover has an insertion hole into which the first boss is inserted.

7. 7. The developing cartridge according to claim 6, the hole is located at one end of the lever cover in the second direction, The developing cartridge, wherein the insertion hole is located at the other end of the lever cover in the second direction.

8. A developing cartridge, A developing roller extending in a first direction; a casing capable of accommodating a developer, the casing having the developing roller located at one end in a second direction intersecting with the first direction; a bearing attached to one end of the casing in the first direction, the bearing supporting the developing roller; a lever located at one end of the casing in the first direction, the lever extending in a third direction intersecting the first direction and the second direction and movable relative to the casing; a lever cover attached to one end of the casing in the first direction, the lever cover holding the lever between the lever cover and the bearing; Equipped with The bearing is A first engagement plate intersecting the first direction; a first arm extending from an end of the first engagement plate farther from the developing roller in the second direction in a direction away from the lever cover in the first direction; a second arm extending from an end of the first engagement plate, the end being farther from the one end of the lever in the third direction than the first direction and the second direction, in a direction away from the lever cover in the first direction; having The lever cover is A second engagement plate intersecting the first direction; a third arm extending from an end of the second engagement plate, the end being closer to the developing roller, in a direction away from the bearing in the first direction; a fourth arm extending from an end of the second engagement plate farther from the other end of the lever in the third direction in a direction away from the bearing in the first direction; having A developing cartridge characterized in that, of both surfaces of the first engagement plate in the first direction, a surface closer to the first arm and the second arm, and a surface closer to the third arm and the fourth arm, of both surfaces of the second engagement plate in the first direction, face each other in the first direction.

9. 9. The developing cartridge according to claim 8, A first screw that fixes the lever cover to the casing The developing cartridge further comprises:

10. 10. The developing cartridge according to claim 9, a developing cartridge, wherein the lever is located between the second engagement plate and the first screw in the second direction.

11. 9. The developing cartridge according to claim 8, The casing has a first boss extending in the first direction, The lever cover has an insertion hole into which the first boss is inserted.

12. 12. The developing cartridge according to claim 11, the second engagement plate is located at one end of the lever cover in the second direction, The developing cartridge, wherein the insertion hole is located at the other end of the lever cover in the second direction.

13. 13. The developing cartridge according to claim 1, A second screw that fixes the bearing to the casing The developing cartridge further comprises:

14. 13. The developing cartridge according to claim 1, The casing comprises: A filling hole for filling the developer; A cap for covering the fill hole; having A developing cartridge, wherein the lever cover covers the filling hole and the cap.

15. 13. The developing cartridge according to claim 1, The developing cartridge is characterized in that the bearing is made of a conductive resin.

16. 13. The developing cartridge according to claim 1, a supply roller extending in the first direction and in contact with the developing roller; Further equipped with The developing cartridge, wherein the bearing supports the supply roller.

17. 13. The developing cartridge according to claim 1, a second boss movable with the casing, the second boss extending in the first direction; Further equipped with The lever is One end of the lever, which functions as a force point; The other end of the lever, which functions as a point of action; A shaft portion located between the one end portion and the other end portion and functioning as a fulcrum; a first hole into which the second boss is fitted; having The lever is rotatable about the shaft portion when the one end portion receives a driving force, a dimension of the first hole in the second direction is greater than a dimension of the boss in the second direction; a boss that moves in the second direction within the first hole when the casing moves in the second direction relative to the lever, the boss moving in the second direction within the first hole, the developing cartridge comprising: a developing member;

18. 18. The developing cartridge according to claim 17, The developing cartridge is used together with a drum cartridge, The drum cartridge is A photoconductor drum; a drum frame into which the developing cartridge can be mounted; having A developing cartridge characterized in that, when the developing cartridge is attached to the drum frame and the one end receives a driving force, the lever rotates about the shaft portion and the other end presses the casing, causing the casing to move relative to the lever in the second direction and in a direction away from the photosensitive drum.

Images