Developing cartridge

Abstract

To provide a drum cartridge and a developing cartridge, capable of suppressing the variation of the position of an electrical contact surface with respect to a drum frame, when attaching the developing cartridge to the drum frame.SOLUTION: A drum cartridge 41 includes a drum frame 45, a photoreceptive drum 42, a transfer roller 43, and a conveyance roller 44. A developing cartridge 1 can be attached to the drum frame 45. The developing cartridge 1 includes a storage medium 31 including a plurality of electrical contact surfaces 31A. The transfer roller 43 comes into contact with the surface of the photoreceptive drum 42. The conveyance roller 44 is located at an interval from the transfer roller 43. The drum frame 45 has a first opening 47 located between the transfer roller 43 and the conveyance roller 44. When the developing cartridge 1 is attached to the drum frame 45, the plurality of electrical contact surfaces 31A are exposed from the first opening 47.SELECTED DRAWING: Figure 11

Description

[Technical field]

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

[0002] Conventionally, a drum cartridge having a drum frame and a developer cartridge having a developer roller and a storage medium including an electrical contact surface are known. The developer cartridge is attached to the drum frame by rotating with respect to the drum frame with the developer roller as a reference. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent Publication No. 2008-249802 Summary of the Invention [Problem to be solved by the invention]

[0004] When the developing cartridge is mounted on the drum frame by rotating the developing cartridge relative to the drum frame with the developing roller as a reference, the position of the electrical contact surface is usually determined with the position of the developing roller as a reference.

[0005] As described in Patent Document 1, when the electrical contact surface of the developer cartridge is positioned away from the developer roller, the distance between the developer roller and the electrical contact surface becomes large.

[0006] Therefore, for example, when producing a developer cartridge, the position of the electrical contact surface varies more as the electrical contact surface is farther away from the reference developer roller, and as a result, when the developer cartridge is mounted on the drum frame, the position of the electrical contact surface relative to the drum frame may vary.

[0007] Therefore, an object of the present disclosure is to provide a developer cartridge capable of suppressing variation in the position of the electrical contact surface with respect to the drum frame when the developer cartridge is attached to the drum frame. [Means for solving the problem]

[0008] The developer cartridge of the present disclosure includes a housing, a developer roller, an agitator, a developer electrode, and a storage medium. The housing is capable of containing toner. The developer roller is rotatable about a first axis extending in a first direction. The developer roller is located at one end of the housing in a second direction. The agitator is rotatable about a second axis extending in the first direction. The agitator is located at a distance from the developer roller in the second direction. The developer electrode is an electrode for supplying power to the developer roller. The developer electrode is located at one end of the housing in the first direction. The developer electrode is located between the developer roller and the agitator in the second direction. The storage medium includes an electrical contact surface.

[0009] The electrical contact surface is located at the other end of the housing in the first direction, located between the developing roller and the agitator in the second direction, located on the outer surface of one end of the housing in the third direction, and aligned with the developing electrode in the third direction.

[0010] According to this configuration, the electrical contact surface is located between the developing roller and the agitator in the second direction.

[0011] Therefore, when the developer cartridge is mounted in the drum frame, the electrical contact surface is located near the developer roller.

[0012] As a result, when the developing cartridge is mounted on the drum frame, it is possible to suppress variation in the position of the electrical contact surface with respect to the drum frame. Effect of the Invention

[0013] According to the developing cartridge of the present disclosure, when the developing cartridge is attached to the drum frame, it is possible to suppress variation in the position of the electrical contact surface with respect to the drum frame. [Brief description of the drawings]

[0014] [Figure 1] FIG. 1 is a perspective view of a developing cartridge. [Diagram 2] FIG. 2 is a cross-sectional view taken along line AA in FIG. [Diagram 3] 3 is an exploded perspective view of one side of the developing cartridge shown in FIG. [Figure 4] 4 is an exploded perspective view of the other side of the developing cartridge shown in FIG. [Diagram 5] FIG. 5 is a side view of the developing cartridge shown in FIG. 4, in which the developing roller bearing, the developing electrode, the supply roller bearing, and the supply electrode are shown. [Figure 6] FIG. 6 is a side view of the developer cartridge shown in FIG. 1, showing a number of electrical contact surfaces. [Figure 7] FIG. 7 is a perspective view of the gear cover shown in FIG. [Figure 8] FIG. 8 is a perspective view of the drum cartridge when the developing cartridge is not attached, showing the first opening and the second opening. [Figure 9] FIG. 9 is a perspective view of the drum cartridge shown in FIG. 8 as seen from a different angle. [Figure 10] FIG. 10 is a perspective view of the drum cartridge with the developing cartridge attached. [Figure 11] FIG. 11 is a perspective view of the drum cartridge shown in FIG. 10 as seen from a different angle. [Figure 12] Fig. 12A is an explanatory diagram for explaining a first modified example, showing a state in which a plurality of electrical contact surfaces are attached to a gear cover via an attachment member. Fig. 12B is an explanatory diagram for explaining the first modified example together with Fig. 12A, showing the attachment member. [Figure 13]Fig. 13A is an explanatory diagram for explaining a second modified example, Fig. 13B is an explanatory diagram for explaining a third modified example, and Fig. 13C is an explanatory diagram for explaining a fourth modified example. [Figure 14] FIG. 14 is an explanatory diagram illustrating the dimensions of the storage medium. [Figure 15] FIG. 15 is an explanatory diagram for explaining a detailed position of the electrical contact surface in the second direction with respect to the surface of the developing roller. [Figure 16] FIG. 16 is an explanatory diagram for explaining a detailed position of the electrical contact surface in the second direction with respect to the developing roller shaft. [Figure 17] FIG. 17 is an explanatory diagram for explaining the detailed position of the electrical contact surface in the second direction with respect to the agitator shaft. [Figure 18] FIG. 18 is an explanatory diagram for explaining the detailed position of the electrical contact surface in the first direction with reference to the development contact surface and the supply contact surface. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0015] 1. Overview of the Developing Cartridge 1 The developing cartridge 1 shown in FIG. 1 is mounted in an image forming apparatus together with a drum cartridge 41, which will be described later, in a state where the developing cartridge 1 is mounted in a drum frame 45 of the drum cartridge 41, as shown in FIG.

[0016] The developing cartridge 1 is detachably attached to a drum frame 45 of a drum cartridge 41 described later. The developing cartridge 1 contains toner. The developing cartridge 1 is capable of supplying toner to the surface of a photosensitive drum 42 (see FIG. 8) described later. When an electrostatic latent image is formed on the surface of the photosensitive drum 42, the electrostatic latent image is developed by supplying toner to the surface of the photosensitive drum 42. By developing the electrostatic latent image, a toner image is formed on the surface of the photosensitive drum 42. The detailed structure of the developing cartridge 1 will be described below.

[0017] As shown in FIG. 1, the developing cartridge 1 includes a developing roller 2, a housing 3, a supply roller 4, and an agitator 5.

[0018] 1.1 Developing roller 2 The developing roller 2 is rotatable about a developing roller axis A4 extending in the first direction. When the developing cartridge 1 is mounted in the drum cartridge 41, the developing roller 2 comes into contact with the surface of the photosensitive drum 42. The developing roller 2 is capable of supplying toner in the housing 3 to the photosensitive drum 42.

[0019] The developing roller 2 is located at one end 3A in the second direction of the housing 3. The developing roller 2 extends in the first direction and has one end in the first direction and the other end in the first direction. The one end of the developing roller 2 in the first direction is located closer to a plurality of electrical contact surfaces 31A (see FIG. 6) described below than the other end of the developing roller 2 in the first direction.

[0020] More specifically, the developing roller 2 includes a developing roller body 2A and a developing roller shaft 2B. The developing roller body 2A extends in a first direction. The developing roller shaft 2B extends along a developing roller axis A4. More specifically, the developing roller shaft 2B extends in the first direction. The developing roller body 2A is rotatable together with the developing roller shaft 2B. The developing roller shaft 2B has one end in the first direction and the other end in the first direction. The one end of the developing roller shaft 2B in the first direction is located closer to a plurality of electrical contact surfaces 31A (see FIG. 6) than the other end of the developing roller shaft 2B in the first direction.

[0021] 1.2 Case 3 The housing 3 is capable of containing toner. The housing 3 has one end in a first direction and the other end in the first direction. The housing 3 also has one end 3A in a second direction and the other end 3B in the second direction. The second direction is the direction in which the developing roller 2 and the agitator 5 are aligned. The second direction intersects with the first direction. More specifically, the second direction is perpendicular to the first direction. The one end 3A in the second direction is closer to the developing roller 2 in the second direction than the other end 3B in the second direction. A handle 8 is located at the other end 3B of the housing 3 in the second direction.

[0022] The details of the housing 3 will be described below with reference to FIG. 2. As shown in FIG. 2, the housing 3 includes a first frame 6 and a second frame 7. The second frame 7 faces the first frame 6 in the third direction. The second frame 7 is connected to the first frame 6. The first frame 6 and the second frame 7 define an internal space of the housing 3. Hereinafter, one end of the housing 3 in the third direction will be referred to as one end 3C. Also, the other end of the housing 3 in the third direction will be referred to as the other end 3D. The first frame 6 includes the other end 3D in the third direction. Also, the second frame 7 includes the one end 3C in the third direction. That is, the housing 3 has one end 3C in the third direction and the other end 3D in the third direction. The one end 3C of the housing 3 in the third direction is closer to the electrical contact surface 31A than the other end 3D of the housing 3 in the third direction. The developing roller 2 is attached to the second frame 7.

[0023] 1.3 Supply roller 4 1, the supply roller 4 is rotatable about a supply roller axis A6 extending in a first direction. The supply roller 4 is a roller for supplying toner in the housing 3 to the development roller 2. The surface of the supply roller 4 contacts the surface of the development roller 2.

[0024] The supply roller 4 is located between the developing roller 2 and the agitator 5 in the second direction. The supply roller 4 extends in the first direction. The supply roller 4 has one end in the first direction and the other end in the first direction. The one end of the supply roller 4 in the first direction is located closer to the multiple electrical contact surfaces 31A (see FIG. 6) than the other end of the supply roller 4 in the first direction. More specifically, the supply roller 4 includes a supply roller body 4A and a supply roller shaft 4B.

[0025] The supply roller body 4A extends in a first direction. The supply roller shaft 4B extends along the supply roller axis A6. More specifically, the supply roller shaft 4B extends in the first direction. The supply roller body 4A is rotatable together with the supply roller shaft 4B. The supply roller shaft 4B has one end in the first direction and the other end in the first direction. The one end of the supply roller shaft 4B in the first direction is located closer to the multiple electrical contact surfaces 31A (see FIG. 6) than the other end of the supply roller shaft 4B in the first direction.

[0026] 1.4 Agitator 5 The agitator 5 is capable of agitating the toner in the housing 3. The agitator 5 is also capable of transporting the toner in the housing 3 toward the developing roller 2 in the second direction. The agitator 5 is rotatable about an agitator axis A5 extending in the first direction. The agitator 5 is positioned at an interval from the developing roller 2 in the second direction. The agitator 5 is located inside the housing 3. The agitator 5 includes an agitator shaft 5A and a plurality of blades 5B.

[0027] 2. Details of Developing Cartridge 1 2.1 Details of one side of the developing cartridge 1 in the first direction Hereinafter, the details of one side of the developing cartridge 1 in the first direction will be described with reference to FIG. 3. As shown in FIG. 3, the developing cartridge 1 includes a gear cover 11, a coupling 12, a developing gear 13, a supply gear 14, an agitator gear 15, an idle gear 16, a first bearing member 17, and a cap 18 on one side of the housing 3 in the first direction. In detail, the developing cartridge 1 includes a gear cover 11, a coupling 12, a developing gear 13, a supply gear 14, an agitator gear 15, an idle gear 16, a first bearing member 17, and a cap 18 on one end of the housing 3 in the first direction. In more detail, the developing cartridge 1 includes a gear cover 11, a coupling 12, a developing gear 13, a supply gear 14, an agitator gear 15, an idle gear 16, a first bearing member 17, and a cap 18 on the outer surface of one end of the housing 3 in the first direction.

[0028] 2.1.1 Gear cover 11 As shown in FIG. 3, the gear cover 11 covers at least a part of the circumference of the development gear 13. The gear cover 11 is attached to one end of the housing 3 in the first direction. More specifically, the gear cover 11 is attached to the outer surface of one end of the housing 3 in the first direction. More specifically, the gear cover 11 is fixed to the outer surface of one end of the housing 3 in the first direction by a screw 19. In this specification, the "gear" is not limited to a gear having gear teeth and transmitting a rotational force by the gear teeth, but includes a gear that transmits a rotational force by friction transmission. In addition, in a member that transmits a rotational force by friction transmission, the tooth tip circle is a circle that passes through the friction transmission surface.

[0029] 2.1.2 Coupling 12 The coupling 12 is rotatable about an axis extending in a first direction. The coupling 12 is rotatable by receiving a driving force. More specifically, the coupling 12 is capable of receiving a driving force from the image forming apparatus. The coupling 12 is rotatable by engaging with a driving member included in the image forming apparatus (not shown). The coupling 12 has a recess that is recessed in the first direction. The recess receives the driving member and is capable of engaging with the driving member. More specifically, the recess is capable of engaging with the driving member of the image forming apparatus and receiving the driving force.

[0030] 2.1.3 Development Gear 13 The developing gear 13 is attached to one end of the developing roller 2 in the first direction. More specifically, the developing gear 13 is attached to one end of the developing roller shaft 2B in the first direction. The developing gear 13 is rotatable together with the developing roller 2. The developing gear 13 is rotatable together with the coupling 12.

[0031] 2.1.4 Supply Gear 14 The supply gear 14 is attached to the supply roller shaft 4 B and is rotatable together with the coupling 12 .

[0032] 2.1.5 Agitator gear 15 The agitator gear 15 is attached to the agitator shaft 5A of the agitator 5. The agitator gear 15 is rotatable together with the agitator 5 in accordance with the rotation of the coupling 12.

[0033] 2.1.6 Idle Gear 16 The idle gear 16 includes a large diameter portion 16A that engages with the gear teeth of the coupling 12 and a small diameter portion 16B that engages with the gear teeth of the agitator gear 15. The idle gear 16 is rotatably supported by a shaft (not shown) of the gear cover 11. The idle gear 16 reduces the rotation of the coupling 12 and transmits it to the agitator gear 15. In the first direction, the large diameter portion 16A is farther from the housing 3 than the small diameter portion 16B.

[0034] 2.1.7 First bearing member 17 The first bearing member 17 is a member that supports the coupling 12, the developing gear 13, and the supply gear 14. The first bearing member 17 includes a boss 17A for supporting the coupling 12. The boss 17A extends in the first direction. The boss 17A has a cylindrical shape. The first bearing member 17 also has a hole 17B into which the developing roller shaft 2B is inserted, and a hole 17C into which the supply roller shaft 4B is inserted. The first bearing member 17 is attached to one end of the developing roller shaft 2B in the first direction by inserting one end of the developing roller shaft 2B in the first direction into the hole 17B. The first bearing member 17 is also attached to one end of the supply roller shaft 4B in the first direction by inserting one end of the supply roller shaft 4B in the first direction into the hole 17C.

[0035] 2.1.8 Cap 18 The cap 18 covers one end of the developing roller shaft 2B in the first direction. The gear cover 11 and the cap 18 may be made of different types of resin.

[0036] 2.2 Details of the other side of the developing cartridge 1 in the first direction Hereinafter, the other side of the developing cartridge 1 in the first direction will be described in detail with reference to FIG. 4 and FIG. 5. As shown in FIG. 4, the developing cartridge 1 includes a developing electrode 21, a supply electrode 22, and a second bearing member 23 on the other side of the housing 3 in the first direction. In detail, the developing cartridge 1 includes the developing electrode 21, the supply electrode 22, and the second bearing member 23 on the other end of the housing 3 in the first direction. That is, the developing electrode 21 and the supply electrode 22 are located on the other end of the housing 3 in the first direction. More specifically, the developing cartridge 1 includes the developing electrode 21, the supply electrode 22, and the second bearing member 23 on the outer surface of the other end of the housing 3 in the first direction. That is, the developing electrode 21 and the supply electrode 22 are located on the outer surface of the other end of the housing 3 in the first direction.

[0037] 2.2.1 Development electrode 21 The developing electrode 21 is an electrode for supplying power to the developing roller 2. The developing electrode 21 supplies power to the developing roller shaft 2B. As shown in FIG. 5, the developing electrode 21 is located between the developing roller 2 and the agitator 5 in the second direction. The developing electrode 21 is separated from the developing roller shaft 2B in the second direction. As shown in FIG. 4, the developing electrode 21 is separated from the end of the developing roller shaft 2B in the first direction. In detail, the developing electrode 21 protrudes in the first direction. The tip of the developing electrode 21 is located farther from the housing 3 than the end of the developing roller shaft 2B in the first direction. The developing electrode 21 is made of, for example, a conductive resin.

[0038] The developer electrode 21 includes a developer contact surface 21A. When the developer cartridge 1 is attached to the image forming apparatus, the developer contact surface 21A comes into contact with an electrode of the image forming apparatus. The developer contact surface 21A extends in the second direction and the third direction. The developer contact surface 21A is separated from the developer roller shaft 2B in the second direction. In addition, the developer contact surface 21A is separated from the end of the developer roller shaft 2B in the first direction.

[0039] The developing electrode 21 further includes a developing contact 21B and a connecting portion 21C. The developing contact 21B contacts the developing roller shaft 2B. The connecting portion 21C electrically connects the developing contact 21B and the developing contact surface 21A.

[0040] The developing contact 21B has a contact hole 21D. The other end of the developing roller shaft 2B in the first direction is inserted into the contact hole 21D. Therefore, the developing contact 21B functions as a bearing for the developing roller shaft 2B. That is, the developing electrode 21 includes a developing roller bearing attached to the other end of the developing roller shaft 2B in the first direction. In other words, the developing cartridge 1 includes a developing roller bearing. The contact hole 21D is preferably a circular hole. In a state where the developing roller shaft 2B is inserted into the contact hole 21D, the developing contact 21B contacts the other end of the developing roller shaft 2B in the first direction. In detail, in a state where the developing roller shaft 2B is inserted into the contact hole 21D, the developing contact 21B contacts the outer circumferential surface of the other end of the developing roller shaft 2B in the first direction. Therefore, the developing contact 21B is attached to the other end of the developing roller shaft 2B in the first direction. In other words, the developing contact 21B is attached to the other end of the developing roller 2 in the first direction. Also, the developer contact point 21B is aligned with the developer contact surface 21A in the second direction, so that the developer contact surface 21A is positioned away from the developer roller shaft 2B in the second direction.

[0041] When the developer cartridge 1 is attached to the image forming apparatus, the developer contact surface 21A comes into contact with an electrode of the image forming apparatus. Therefore, the developer electrode 21 can receive power from the image forming apparatus and supply power to the developer roller 2.

[0042] 2.2.2 Supply electrode 22 The supply electrode 22 is an electrode for supplying power to the supply roller 4. The supply electrode 22 supplies power to the supply roller shaft 4B. As shown in FIG. 5, the supply electrode 22 is located between the developing electrode 21 and the agitator 5 in the second direction. The supply electrode 22 is separated from the supply roller shaft 4B in the second direction. As shown in FIG. 4, the supply electrode 22 is separated from the end of the developing roller shaft 2B in the first direction. In detail, the supply electrode 22 protrudes in the first direction. The tip of the supply electrode 22 is located farther from the housing 3 than the end of the developing roller shaft 2B in the first direction. The supply electrode 22 is made of, for example, a conductive resin.

[0043] The supply electrode 22 includes a supply contact surface 22A. When the developer cartridge 1 is attached to the image forming apparatus, the supply contact surface 22A comes into contact with an electrode of the image forming apparatus. The supply contact surface 22A extends in the second direction and the third direction. The supply contact surface 22A is separated from the supply roller shaft 4B in the second direction. In addition, the supply contact surface 22A is separated from the end of the supply roller shaft 4B in the first direction.

[0044] The supply electrode 22 further includes a supply contact 22B and a connecting portion 22C. The supply contact 22B contacts the supply roller shaft 4B. The connecting portion 22C electrically connects the supply contact surface 22A and the supply contact 22B.

[0045] The supply contact 22B has a contact hole 22D. The other end of the supply roller shaft 4B in the first direction is inserted into the contact hole 22D. Therefore, the supply contact 22B functions as a bearing for the supply roller shaft 4B. That is, the supply electrode 22 includes a supply roller bearing attached to the other end of the supply roller shaft 4B in the first direction. In other words, the developing cartridge 1 includes a supply roller bearing. The contact hole 22D is preferably a circular hole. In a state where the supply roller shaft 4B is inserted into the contact hole 22D, the supply contact 22B contacts the other end of the supply roller shaft 4B in the first direction. In detail, in a state where the supply roller shaft 4B is inserted into the contact hole 22D, the supply contact 22B contacts the outer circumferential surface of the other end of the supply roller shaft 4B in the first direction. In other words, the supply contact 22B is attached to the other end of the supply roller shaft 4B in the first direction. Additionally, the supply contact point 22B is aligned with the supply contact surface 22A in the second direction, so that the supply contact surface 22A is positioned away from the supply roller shaft 4B in the second direction.

[0046] When the developer cartridge 1 is attached to the image forming apparatus, an electrode of the image forming apparatus comes into contact with the supply contact surface 22A of the supply electrode 22. Therefore, the supply electrode 22 can receive power from the image forming apparatus and supply the power to the supply roller 4.

[0047] 2.2.3 Second bearing member 23 The second bearing member 23 includes a first support portion 23A and a second support portion 23B. The first support portion 23A rotatably supports the developing roller shaft 2B. The second support portion 23B rotatably supports the supply roller shaft 4B. The second bearing member 23 is fixed to the outer surface of the other end portion in the first direction of the housing 3 while supporting the developing roller shaft 2B and the supply roller shaft 4B.

[0048] The developing electrode 21 and the supply electrode 22, together with a second bearing member 23, are fixed by a screw 24 to the outer surface of the other end of the housing 3 in the first direction.

[0049] 2.3 Details of one side of the developing cartridge 1 in the third direction 6 and 7, one side of the developing cartridge 1 in the third direction will be described in detail. The developing cartridge 1 includes a storage medium 31 and a plurality of ribs 32.

[0050] 2.3.1 Storage medium 31 More specifically, the storage medium 31 is an IC chip. The storage medium 31 includes an electrical contact surface 31A. The number of electrical contact surfaces 31A may be one. The number of electrical contact surfaces 31A may be multiple. In this embodiment, an example in which there are four electrical contact surfaces 31A will be described. The four electrical contact surfaces 31A are aligned in the first direction.

[0051] The electrical contact surface 31A is located on one side in the third direction of the housing 3. In particular, the electrical contact surface 31A is located at one end 3C in the third direction of the housing 3. More particularly, the storage medium 31 including the electrical contact surface 31A is located on the outer surface of the one end 3C in the third direction of the housing 3.

[0052] One end 3C of the housing 3 in the third direction is closer to the electrical contact surface 31A than the other end 3D of the housing 3 in the third direction. In detail, the outer surface of the one end 3C of the housing 3 in the third direction is closer to the storage medium 31 including the electrical contact surface 31A than the outer surface of the other end 3D of the housing 3 in the third direction.

[0053] The electrical contact surface 31A is located at one end of the housing 3 in the first direction. Specifically, the electrical contact surface 31A is located on the outer surface of the gear cover 11. More specifically, the electrical contact surface 31A is located on the outer surface of one end of the gear cover 11 in the third direction. That is, the electrical contact surface 31A is located on the outer surface of the housing 3 via the gear cover 11. Specifically, the electrical contact surface 31A is located on the outer surface of one end of the housing 3 in the first direction via the gear cover 11. Note that the electrical contact surface 31A is adhered to the outer surface of the gear cover 11 by an adhesive. That is, the gear cover 11 includes the electrical contact surface 31A.

[0054] The gear cover 11 further includes a protrusion 33. That is, the developing cartridge 1 is provided with the protrusion 33. When the developing cartridge 1 is attached to a drum frame 45 (see FIG. 8) described later, the protrusion 33 fits into a first opening 47 (see FIG. 8) of the drum frame 45 described later. As a result, the protrusion 33 positions the developing cartridge 1 with respect to the drum cartridge 41. The protrusion 33 is aligned with the multiple electrical contact surfaces 31A in the second direction. In detail, the multiple electrical contact surfaces 31A are aligned with the protrusion 33 in the second direction. The protrusion 33 is located closer to the developing roller 2 in the second direction than the multiple electrical contact surfaces 31A.

[0055] 2.3.2 Multiple Ribs 32 The ribs 32 can come into contact with the paper conveyed by a conveying roller 44 (see FIG. 9), which will be described later. The ribs 39 come into contact with the paper, thereby guiding the paper between the photosensitive drum 42 and the transfer roller 43, and reducing the contact area between the housing 3 and the paper.

[0056] Each of the multiple ribs 32 protrudes in the third direction from the outer surface of the housing 3. In particular, each of the multiple ribs 32 protrudes in the third direction from the second frame 7 of the housing 3. That is, the second frame 7 includes the multiple ribs 32. Moreover, each of the multiple ribs 32 extends in the second direction.

[0057] The multiple ribs 32 are aligned in the first direction. In particular, the multiple ribs 32 are spaced apart from each other in the first direction. The multiple ribs 32 are aligned with the electrical contact surface 31A in the first direction. The multiple ribs 32 are aligned with the electrical contact surface 31A and at least a part of the developing electrode 21 in the first direction. The multiple ribs 32 are aligned with the electrical contact surface 31A and at least a part of the supply electrode 22 in the first direction. The length of the multiple ribs 32 in the first direction is longer than the length of the paper conveyed by the conveying roller 44 in the first direction. The length of the multiple ribs 32 in the first direction is shorter than the length of the developing roller main body 2A in the first direction. The length of the multiple ribs 32 in the first direction is longer than the length of the electrical contact surface 31A in the first direction.

[0058] 2.4 Positional Relationships of Electrical Contact Surface 31A, Development Roller 2, Agitator 5, Development Electrode 21, and Supply Electrode 22 Hereinafter, the positional relationship between the electrical contact surface 31A, the developing roller 2, the agitator 5, the developing electrode 21, and the supply electrode 22 will be described with reference to FIG.

[0059] The electrical contact surface 31A is located between the developing roller 2 and the agitator 5 in the second direction. In particular, the electrical contact surface 31A is located between the developing roller shaft A4 and the agitator shaft A5 in the second direction.

[0060] The electrical contact surface 31A is located at a position corresponding to both the developing electrode 21 and the supply electrode 22 in the third direction. In particular, the multiple electrical contact surfaces 31A are aligned with the developing electrode 21 and the supply electrode 22 in the third direction. In particular, the electrical contact surface 31A is aligned with one end of the developing electrode 21 in the second direction in the third direction. In other words, the electrical contact surface 31A is aligned with at least a portion of the developing electrode 21 in the third direction. Also, the electrical contact surface is aligned with at least a portion of the supply electrode 22 in the third direction. In particular, the electrical contact surface 31A is located at a position corresponding to both the developing contact surface 21A and the supply contact surface 22A in the third direction.

[0061] 3. Overview of Drum Cartridge 41 8 and 9, the drum cartridge 41 will be described in brief. The drum cartridge 41 includes a photosensitive drum 42, a transfer roller 43, a transport roller 44, and a drum frame 45.

[0062] 3.1 Photosensitive drum 42 The photosensitive drum 42 is located at one end 45A in the second direction of the drum frame 45. The photosensitive drum 42 is rotatable about a first axis A1 extending in the first direction. An electrostatic latent image is formed on the surface of the photosensitive drum 42.

[0063] 3.2 Transfer roller 43 The transfer roller 43 is capable of transferring the toner image on the surface of the photosensitive drum 42 onto a sheet of paper. The transfer roller 43 is rotatable about a second axis A2 extending in the first direction. The transfer roller 43 comes into contact with the surface of the photosensitive drum 42.

[0064] 3.3 Transport roller 44 The transport roller 44 is a roller for transporting the paper between the photosensitive drum 42 and the transfer roller 43. The transport roller 44 is rotatable about a third axis A3 extending in the first direction. The transport roller 44 is positioned at a distance from the transfer roller 43 in the second direction.

[0065] 3.4 Drum Frame 45 The drum frame 45 has one end 45A in the second direction and the other end 45B in the second direction. The one end 45A is closer to the photosensitive drum 42 than the other end 45B in the second direction.

[0066] In addition, both ends of the drum frame 45 in the first direction are provided with guides 46A, 46B into which both ends of the developing roller shaft 2B in the first direction fit when the developing cartridge 1 is attached to the drum frame 45. In detail, one end of the drum frame in the first direction has a guide 46A into which one end of the developing roller shaft 2B in the first direction fits. Meanwhile, the other end of the drum frame in the first direction has a guide 46B into which the other end of the developing roller shaft 2B in the first direction fits. The drum frame 45 has a first opening 47 and a second opening 48. In addition, the drum frame 45 has a guide frame 49.

[0067] 3.4.1 First opening 47 When the developer cartridge 1 is attached to the drum frame 45, the first opening 47 exposes the electrical contact surface 31A and receives the protrusion 33. Therefore, when the developer cartridge 1 is attached to the image forming apparatus, the electrical contact surface 31A comes into contact with an electrode of the image forming apparatus through the first opening 47. Details of the first opening 47 will be described later with reference to Figures 10 and 11.

[0068] 3.4.2 Second opening 48 The second opening 48 allows the paper conveyed by the conveying roller 44 to pass toward the contact surface between the photosensitive drum 42 and the transfer roller 43. More specifically, the second opening 48 exposes the multiple ribs 32 when the developing cartridge 1 is mounted on the drum frame 45. Therefore, when the developing cartridge 1 is mounted on the image forming apparatus, the paper conveyed by the conveying roller 44 comes into contact with the multiple ribs 32 exposed from the second opening 48. Thereafter, the paper further passes through the second opening 48 and is conveyed to the contact surface between the photosensitive drum 42 and the transfer roller 43. Details of the second opening 48 will be described later with reference to FIGS. 10 and 11.

[0069] 3.4.3 Guide Frame 49 The guide frame 49 is capable of guiding the paper transported by the transport rollers 44. Details of the guide frame 49 will be described later with reference to FIGS.

[0070] 3.5 Mounting state of the developing cartridge 1 to the drum cartridge 41 Hereinafter, the first opening 47, the second opening 48, and the guide frame 49 in a state in which the developing cartridge 1 is attached to the drum frame 45 will be described with reference to FIGS.

[0071] First, the installation of the developing cartridge 1 into the drum frame 45 will be described. The developing cartridge 1 is installed in the drum cartridge 41 by swinging about the developing roller shaft 2B relative to the drum cartridge 41. More specifically, when the developing cartridge 1 is installed in the drum frame 45, both ends of the developing roller shaft 2B fit into guides 46A, 46B (see FIG. 9) of the drum frame 45. In this state, the developing cartridge 1 swings about the developing roller shaft 2B relative to the drum cartridge 41. Then, the drum frame 45 faces the second frame 7 of the developing cartridge 1 in the third direction. At this time, the developing cartridge 1 is positioned in the drum frame 45. This completes the installation of the developing cartridge 1 into the drum frame 45.

[0072] In this state, the electrical contact surface 31A is exposed from the first opening 47. That is, when the developing cartridge 1 is attached to the drum frame 45, the electrical contact surface 31A is exposed from the first opening 47. More specifically, when the developing cartridge 1 is swung about the developing roller shaft 2B relative to the drum frame 45 and attached to the drum frame 45, the electrical contact surface 31A is exposed from the first opening 47.

[0073] After that, the drum cartridge 41 and the developing cartridge 1 are mounted on an image forming device having a plurality of electrodes. At this time, one of the plurality of electrical contact surfaces 31A contacts one of the plurality of electrodes. The number of electrodes in the image forming device is the same as the number of electrical contact surfaces 31A. That is, in this embodiment, since the number of electrical contact surfaces 31A is four, the number of electrodes in the image forming device is four.

[0074] 11, the first opening 47 is located between the transfer roller 43 and the transport roller 44 in the second direction. The first opening 47 is located at one end of the drum frame 45 in the first direction. The dimension of the first opening 47 in the first direction is longer than the dimension of the electrical contact surface 31A in the first direction. The first opening 47 has a first portion 47A and a second portion 47B.

[0075] The first portion 47A exposes the electrical contact surface 31A. Therefore, the dimension of the first portion 47A in the first direction is longer than the dimension of the electrical contact surface 31A in the first direction. The second portion 47B fits into the protrusion 33 (see FIG. 6) of the developing cartridge 1. The second portion 47B is aligned with the first portion 47A in the second direction. The second portion 47B is located on the opposite side of the conveying roller 44 to the first portion 47A in the second direction. The dimension of the second portion 47B in the first direction is shorter than the dimension of the first portion 47A in the first direction.

[0076] The second opening 48 is located between the transfer roller 43 and the conveying roller 44 in the second direction. The second opening 48 is aligned with the first opening 47 in the first direction. The dimension of the second opening 48 in the first direction is longer than the dimension of the multiple ribs 32 in the first direction. The dimension of the second opening 48 in the first direction is approximately equal to the dimension of the transfer roller 43 in the first direction.

[0077] The guide frame 49 is located between the first opening 47 and the second opening 48 in the first direction. The guide frame 49 extends in the second direction. The guide frame 49 also functions as a reinforcing frame for reinforcing the drum frame 45. In detail, the drum frame 45 includes a reinforcing frame. The reinforcing frame is located between the first opening 47 and the second opening 48 in the first direction.

[0078] 4. Effects As shown in FIGS. 8 to 11, the drum cartridge 41 has a first opening 47 for exposing the electrical contact surface 31A.

[0079] As a result, when the developing cartridge 1 is attached to the drum frame 45, the electrical contact surface 31A can be exposed from the first opening 47.

[0080] Further, the first opening 47 is located between the transfer roller 43 and the transport roller 44. Therefore, the first opening 47 is located near the photosensitive drum 42. In detail, when the developer cartridge 1 is attached to the drum frame 45, the first opening 47 is located near the developer roller 2. In other words, when the developer cartridge 1 is attached to the drum frame 45, the electrical contact surface 31A is located near the developer roller 2.

[0081] Therefore, the distance between the developing roller 2 and the electrical contact surface 31A is reduced. In particular, the dimensional tolerance of the distance between the developing roller 2 and the electrical contact surface 31A is reduced.

[0082] As a result, for example, when the developing cartridge 1 is produced, the variation in the position of the electrical contact surface 31A relative to the drum frame 45 is reduced. In other words, when the developing cartridge 1 is attached to the drum frame 45, the occurrence of variation in the position of the electrical contact surface 31A relative to the drum frame 45 can be suppressed. More preferably, when the end of the developing roller 2 fits into the end of the drum frame 45 and the developing cartridge 1 rotates relative to the drum frame 45 with the developing roller 2 as a reference, the variation in the position of the electrical contact surface 31A relative to the drum frame 45 can be suppressed when the developing cartridge 1 is attached to the drum frame 45.

[0083] 5, in the developing cartridge 1, the electrical contact surface 31A is located between the developing roller 2 and the agitator 5 in the second direction. In other words, when the developing cartridge 1 is attached to the drum frame 45, the electrical contact surface 31A is located near the developing roller 2.

[0084] Therefore, the distance between the developing roller 2 and the electrical contact surface 31A is reduced. In particular, the dimensional tolerance of the distance between the developing roller 2 and the electrical contact surface 31A is reduced.

[0085] As a result, for example, when the developing cartridge 1 is produced, the variation in the position of the electrical contact surface 31A relative to the drum frame 45 is reduced. In other words, when the developing cartridge 1 is attached to the drum frame 45, the occurrence of variation in the position of the electrical contact surface 31A relative to the drum frame 45 can be suppressed. More preferably, when the end of the developing roller 2 fits into the end of the drum frame 45 and the developing cartridge 1 rotates relative to the drum frame 45 with the developing roller 2 as a reference, the variation in the position of the electrical contact surface 31A relative to the drum frame 45 can be suppressed when the developing cartridge 1 is attached to the drum frame 45.

[0086] Moreover, the electrical contact surface 31A is located at one end in the first direction of the housing 3. On the other hand, the development electrode 21 and the supply electrode 22 are located at the other end in the first direction of the housing 3.

[0087] Therefore, it is possible to prevent the power supplied to the developing electrode 21 and the supply electrode 22 from being transmitted to the electrical contact surface 31A.

[0088] As a result, it is possible to prevent the storage medium 31 from being damaged due to the power supplied to the developing electrode 21 and the supply electrode 22 being transmitted to the storage medium 31.

[0089] Additionally, the multiple ribs 32 are aligned with the electrical contact surface 31A in the first direction.

[0090] Therefore, when the paper is being transported by the transport rollers 44, the electrical contact surface 31A is located outside the paper being transported by the transport rollers 44.

[0091] As a result, the electrical contact surface 31A can be prevented from interfering with the transport of the paper by the transport roller 44.

[0092] Furthermore, when the developing cartridge 1 is attached to the drum cartridge 41, a portion of the space between the developing roller 2 and the agitator 5 is exposed through the second opening 48 of the drum cartridge 41. The electrical contact surface 31A is located between the developing roller 2 and the agitator 5, and is located at an end of the portion between the developing roller 2 and the agitator 5. This is because the paper transported by the transport roller 44 is transported between the photosensitive drum 42 and the transfer roller 43 through the second opening 48 of the drum cartridge 41.

[0093] The electrical contact surface 31A is located between the developing roller 2 and the agitator 5, and is located at an end portion of the gap between the developing roller 2 and the agitator 5. As a result, when the conveying roller 44 conveys a sheet between the photosensitive drum 42 and the transfer roller 43 in a state in which the electrical contact surface 31A is in contact with the electrode of the image forming device, it is possible to prevent the electrical contact surface 31A from interfering with the conveying of the sheet.

[0094] 5. Variations Hereinafter, the modified example will be described with reference to FIG. 12A to FIG. 13C.

[0095] 5.1 First modified example 12A and 12B, instead of being adhered to the outer surface of the gear cover 11, the electrical contact surface 31A may be adhered to the outer surface of a mounting member 100 separate from the gear cover 11 and attached to the outer surface of the gear cover 11 via the mounting member 100. In this case, by replacing the mounting member 100 supporting the electrical contact surface 31A, it is possible to replace the electrical contact surface 31A without replacing the entire gear cover 11.

[0096] Moreover, the mounting member 100 may be attached to the outer surface of the housing 3 without using the gear cover 11 therebetween.

[0097] 5.2 Second variant The electrical contact surface 31A may be supported by the housing 3 instead of being adhered to the outer surface of the gear cover 11. In particular, the housing 3 may include the electrical contact surface 31A. As shown in Fig. 13A, the housing 3 includes an attachment portion 104 to which the electrical contact surface 31A is attached.

[0098] Additionally, the developing cartridge 1 may include a protrusion 105 instead of the protrusion 33. The protrusion 105 extends from the housing 3.

[0099] 5.3 Third variant The electrical contact surface 31A may be supported by the first bearing member 17 instead of being bonded to the outer surface of the gear cover 11. In particular, the first bearing member 17 may include the electrical contact surface 31A. As shown in FIG. 13B , the first bearing member 17 includes an attachment portion 107. The electrical contact surface 31A is attached to the attachment portion 107.

[0100] Furthermore, the developer cartridge 1 may have a protrusion 108 instead of the protrusion 33. The protrusion 108 extends from the first bearing member 17. That is, the first bearing member 17 may include the protrusion 108.

[0101] 5.4 Fourth Variation The electrical contact surface 31A may be supported by the first bearing member 17 and the housing 3 instead of being bonded to the outer surface of the gear cover 11. In detail, as shown in FIG. 13C, the first bearing member 17 includes a first mounting portion 102A. The housing 3 includes a second mounting portion 102B. The first mounting portion 102A and the second mounting portion 102B are connected in a first direction. The electrical contact surface 31A is attached to the first mounting portion 102A and the second mounting portion 102B.

[0102] Furthermore, the developing cartridge 1 may have a protrusion 103 instead of the protrusion 33. The protrusion 103 has a first protrusion 103A extending from the first bearing member 17 and a second protrusion 103B extending from the housing 3.

[0103] 5.5 Fifth Variation The drum frame 45 may not include the guide frame 49. In particular, the first opening 47 may be continuous with the second opening 48. More particularly, the first opening 47 may include the second opening 48.

[0104] 6. Dimensions of storage medium 31 Specific dimensions of the storage medium 31 will be described below with reference to Fig. 14. Note that the following dimensions of the storage medium 31 can be applied to any of the above-described embodiment and each of the modified examples.

[0105] The length L1 of the storage medium 31 in the first direction is 16.85 mm.

[0106] The length L2 of the storage medium 31 in the second direction is 14 mm.

[0107] The length L3 of one electrical contact surface 31A in the first direction is 3.6 mm.

[0108] The length L4 of the electrical contact surface 31A in the second direction is 12 mm.

[0109] The four electrical contact surfaces 31A are arranged in the first direction at intervals of 0.15 mm.

[0110] 7. Detailed location of electrical contact surface 31A Hereinafter, the detailed position of the electrical contact surface 31A will be described with specific dimensions with reference to Figures 15 to 18. Note that the detailed position of the electrical contact surface 31A described below can be applied to any of the above-described embodiments and each of the modified examples.

[0111] 15, the distance from the electrical contact surface 31A to the surface S of the developing roller 2 in the second direction may be 11 mm or more and 26 mm or less. In other words, at least a part of the electrical contact surface 31A is located within a range of 11 mm or more and 26 mm or less from the surface S of the developing roller 2 in the second direction. Note that the surface S of the developing roller 2 is the part of the circumferential surface of the developing roller 2 that is the farthest from the agitator shaft A5 in the second direction.

[0112] More specifically, the storage medium 31 has one end 31B and the other end 31C in the second direction. The other end 31C is located away from the one end 31B in the second direction. The other end 31C is located between the agitator shaft A5 and the one end 31B in the second direction. In the second direction, the distance D1 between the one end 31B of the storage medium 31 and the surface S of the developing roller 2 is 11.924 mm. In addition, in the second direction, the distance D2 between the other end 31C of the storage medium 31 and the surface S of the developing roller 2 is 25.355 mm. In addition, the outer diameter of the developing roller 2 is 13 mm.

[0113] In this case, the entire electrical contact surface 31A is located within a range of 11 mm or more and 26 mm or less from the surface S of the developing roller 2 in the second direction.

[0114] 16, the distance from the electrical contact surface 31A to the developing roller shaft A4 in the second direction may be 5 mm or more and 19 mm or less. In other words, at least a part of the electrical contact surface 31A is located within a range of 5 mm or more and 19 mm or less from the developing roller shaft A4 in the second direction.

[0115] More specifically, in the second direction, a distance D3 between one end 31B of the storage medium 31 and the developing roller shaft A4 is 5.424 mm. Also, in the second direction, a distance D4 between the other end 31C of the storage medium 31 and the surface S of the developing roller 2 is 18.855 mm.

[0116] In this case, the entire electrical contact surface 31A is located within a range of 5 mm or more and 19 mm or less from the developing roller axis A4 in the second direction.

[0117] 17, the distance from the electrical contact surface 31A to the agitator axis A5 in the second direction may be 26 mm or more and 40 mm or less. In other words, at least a part of the electrical contact surface 31A is located within a range of 26 mm or more and 40 mm or less from the agitator axis A5 in the second direction.

[0118] More specifically, in the second direction, a distance D5 between one end 31B of the storage medium 31 and the agitator shaft A5 is 39.515 mm. Also, in the second direction, a distance D6 between the other end 31C of the storage medium 31 and the agitator shaft A5 is 26.084 mm.

[0119] In this case, the entire electrical contact surface 31A is located within a range of 26 mm or more and 40 mm or less from the agitator axis A5 in the second direction.

[0120] 18, the distance from the electrical contact surface 31A to the developing contact surface 21A in the first direction may be 226 mm or more and 244 mm or less. In other words, at least a part of the electrical contact surface 31A is located within a range of 226 mm or more and 244 mm or less from the developing contact surface 21A in the first direction.

[0121] More specifically, the storage medium 31 has one end 31D and the other end 31E in the first direction. The other end 31E is located away from the one end 31D in the first direction. The other end 31E is located on the opposite side of the one end 31D from the developing contact surface 21A in the first direction. In the first direction, a distance D7 between the one end 31D of the storage medium 31 and the developing contact surface 21A is 226.25 mm. In addition, a distance D8 between the other end 31E of the storage medium 31 and the developing contact surface 21A in the first direction is 243.10 mm.

[0122] In this case, the entire electrical contact surface 31A is located within a range of 226 mm or more and 244 mm or less from the development contact surface 21A in the first direction.

[0123] The distance from the electrical contact surface 31A to the supply contact surface 22A in the first direction may be 226 mm or more and 244 mm or less. In other words, at least a part of the electrical contact surface 31A is located within a range of 226 mm or more and 244 mm or less from the supply contact surface 22A in the first direction.

[0124] More specifically, in the first direction, the distance between one end 31D of the storage medium 31 and the supply contact surface 22A is 226.25 mm, which is the same as the distance D7 between one end 31D of the storage medium 31 and the developer contact surface 21A. Also, in the first direction, the distance between the other end 31E of the storage medium 31 and the supply contact surface 22A is 243.10 mm, which is the same as the distance D8 between the other end 31E of the storage medium 31 and the developer contact surface 21A.

[0125] In this case, the entire electrical contact surface 31A is located within a range of 226 mm to 244 mm from the supply contact surface 22A in the first direction. [Explanation of symbols]

[0126] 1 Developer cartridge 2 Developing roller 2B Developing roller shaft 3. Chassis 3A One end 3B Other end 3C One end 3D other end 4 Supply roller 4B Supply roller shaft 5 Agitator 6 First Frame 7 2nd Frame 11 Gear cover 13 Development gear 17 First bearing member 21 Development electrode 22 Supply electrode 31 Storage medium 31A Electrical Contact Surface 32 Ribs 33 Protrusion 41 Drum Cartridge 42 Photosensitive drum 43 Transfer roller 44 Transport roller 45 Drum Frame 45A One end 45B Other end 47 First Opening 47A Part 1 47B 2nd part 48 Second Opening 49 Guide Frame 103 Protrusion 105 Protrusion 108 Protrusion A1 First axis A2 2nd axis A3 3rd axis A4 developing roller shaft A5 Agitator shaft A6 Supply roller shaft

Claims

1. a housing capable of containing toner, the housing having one end in a first direction and another end in the first direction; a developing roller rotatable about a developing roller axis extending in the first direction, the developing roller being located at one end of the housing in the second direction; an agitator rotatable about an agitator shaft extending in the first direction and positioned at a distance from the developing roller in the second direction; a developing electrode for supplying power to the developing roller, the developing electrode being located at the other end of the housing in the first direction and between the developing roller and the agitator in the second direction; a storage medium including an electrical contact surface; The electrical contact surface is A developing cartridge characterized by being located at one end of the housing in the first direction, located between the developing roller and the agitator in the second direction, located on the outer surface of one end of the housing in the third direction, and aligned with the developing electrode in the third direction.

2. 2. The developing cartridge according to claim 1, wherein the developing electrode is located on an outer surface of the other end of the casing in the first direction.

3. 3. The developing cartridge according to claim 1, wherein the electrical contact surface is located on an outer surface of the one end of the housing in the first direction.

4. 4. The developer cartridge according to claim 1, wherein the developer electrode protrudes in the first direction.

5. 5. The developing cartridge according to claim 1, wherein the developing roller has a developing roller shaft extending in the first direction.

6. 6. The developing cartridge according to claim 5, wherein the developing electrode has a developing contact surface spaced apart from the developing roller shaft in the second direction.

7. 7. The developer cartridge according to claim 6, wherein the developer contact surface is located away from an end of the developer roller shaft in the first direction.

8. 8. The developing cartridge according to claim 5, wherein the developing electrode has a developing roller bearing attached to an end of the developing roller shaft in the first direction.

9. the developing roller shaft has one end in the first direction and the other end in the first direction, one end of the developing roller shaft in the first direction is located closer to the electrical contact surface than the other end of the developing roller shaft in the first direction; 9. The developing cartridge according to claim 8, wherein the developing roller bearing is attached to the other end of the developing roller shaft in the first direction.

10. The developing cartridge according to claim 9 , further comprising a developing gear attached to the one end of the developing roller shaft in the first direction and rotatable together with the developing roller shaft.

11. The developing cartridge according to claim 10 , further comprising a gear cover attached to one end of the housing in the first direction and covering at least a part of a periphery of the developing gear.

12. The developing cartridge according to claim 11 , wherein the gear cover is attached to an outer surface of one end of the housing in the first direction.

13. 13. The developing cartridge according to claim 11, wherein the electrical contact surface is located on an outer surface of the gear cover.

14. 14. The developing cartridge according to claim 13, wherein the electrical contact surface is located at the one end of the gear cover in the third direction.

15. 15. The developing cartridge according to claim 14, wherein the electrical contact surface is located on an outer surface of the one end of the gear cover in the third direction.

16. 16. The developer cartridge according to claim 13, wherein the electrical contact surface is adhered to the gear cover by an adhesive.

17. 17. The developing cartridge according to claim 5, wherein the developing cartridge is mounted in the drum cartridge by pivoting about the developing roller shaft relative to the drum cartridge.

18. a projection for positioning the drum cartridge relative to the drum cartridge; 18. The developer cartridge according to claim 17, wherein the electrical contact surface is aligned with the protrusion in the second direction.

19. 20. The developing cartridge according to claim 18, wherein the projection is located on an outer surface of the housing.

20. the housing has one end in the second direction and another end in the second direction, 20. The developing cartridge according to claim 1, wherein the one end of the housing in the second direction is closer to the developing roller in the second direction than the other end of the housing in the second direction.

21. the housing has one end in the third direction and another end in the third direction, 21. The developing cartridge according to claim 1, wherein the one end of the housing in the third direction is closer to the electrical contact surface than the other end of the housing in the third direction.

22. the one end of the housing in the third direction includes a plurality of ribs extending in the second direction, 22. The developer cartridge according to claim 21, wherein the plurality of ribs are aligned with the electrical contact surface in the first direction.

23. 23. The developing cartridge according to claim 1, wherein the developing electrode is made of a conductive resin.

24. 24. A developing cartridge as described in any one of claims 1 to 23, characterized in that it comprises a supply roller that is rotatable about a supply roller axis extending in the first direction, a supply roller that is positioned between the developing roller and the agitator in the second direction, and a supply roller that contacts a surface of the developing roller.

Images