Developer cartridge

Abstract

To provide a developing cartridge that arranges a holder at a position where the holder is not in contact with an agitator gear in a state in which the holder is moving with respect to a casing, while reducing the size of the developing cartridge in a first direction.SOLUTION: A projection 212 extends in a first direction from one end of a casing 21 in the first direction. The projection 212 is located between the casing 21 and a large diameter gear 247 in the first direction. The projection 212 is located separated from a small diameter gear 249 in a second direction. The projection 212 is movable together with the casing. A first holder 34 is located at one end of the casing 21 in the first direction. The first holder 34 holds a main body electric contact 15. The first holder 34 is located separated from the projection 212 compared with the large diameter gear 247 in the first direction. The first holder 34 and the electric contact surface 15 are movable with respect to the casing 21.SELECTED DRAWING: Figure 1

Description

[Technical Field]

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

[0002] Patent Document 1 describes a developer cartridge that can be attached to a drum cartridge. The developer cartridge has a casing that can accommodate developer, a developer roller that extends in a first direction, an agitator that can agitate the developer, an agitator gear, a protrusion, and a developer memory. The agitator gear has a large-diameter gear and a small-diameter gear. The large-diameter gear is located farther from one end of the casing than the small-diameter gear in the first direction. The protrusion is located between one end of the casing and the large-diameter gear in the first direction. This allows the developer cartridge to be made smaller in size in the first direction. The developer memory has an electrical contact surface that can move together with the casing. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 2019-174624 Summary of the Invention [Problem to be solved by the invention]

[0004] In order to prevent the electrical contact surface from rubbing against the electrical contacts of the main body of the image forming apparatus when the developer cartridge is installed in the image forming apparatus, it is conceivable to provide the developer cartridge described in Patent Document 1 with a holder that is movable relative to the casing while holding the electrical contact surface. However, Patent Document 1 does not consider how to position the holder. When providing a holder on the developer cartridge, it is necessary to position the holder in a position where it does not come into contact with the agitator gear when the holder is moving relative to the casing.

[0005] An object of the present disclosure is to provide a developer cartridge in which the developer cartridge is made smaller in size in a first direction, and the holder is positioned so as not to come into contact with the agitator gear when the holder is moving relative to the casing. [Means for solving the problem]

[0006] In order to solve the above problem, a first aspect of the present invention is a developer cartridge including a casing capable of accommodating a developer, a developer roller rotatable about a developer roller axis extending in a first direction and positioned at one end of the casing in a second direction intersecting the first direction, an agitator rotatable about an agitator axis extending in the first direction, an agitator gear positioned at one end of the casing in the first direction and rotatable together with the agitator about the agitator axis, the agitator gear having a large diameter gear and a small diameter gear smaller in diameter than the large diameter gear and positioned between the large diameter gear and the casing in the first direction, and a developing cartridge including a developing roller rotatable about an agitator axis extending in the first direction and positioned at one end of the casing in the first direction. a first protrusion extending in the first direction from one end of the casing, the first protrusion being located between the casing and the large diameter gear in the first direction and located away from the small diameter gear in the second direction, the first protrusion being movable together with the casing; a developing memory having a first electrical contact surface; and a first holder located at one end of the casing in the first direction, the first holder holding the first electrical contact surface, the first holder being located away from the first protrusion in the first direction than the large diameter gear, wherein the first holder and the first electrical contact surface are movable relative to the casing.

[0007] A second aspect is the developer cartridge of the first aspect, wherein the first protrusion is configured to receive a pressing force from the other end of the casing in the second direction toward one end of the casing in the second direction.

[0008] A third aspect is a developing cartridge of the second or first aspect, further comprising a gear cover that covers at least a portion of the agitator gear and is fixed to one end of the casing in the first direction, and the first holder is positioned farther from the large diameter gear in the first direction than the gear cover.

[0009] A fourth aspect is the developing cartridge of the third aspect, wherein the first holder is movable relative to the gear cover.

[0010] A fifth aspect is a developing cartridge of the fourth aspect, further comprising a first holder cover that holds the first holder and is fixed to the outer surface of the gear cover in the first direction, and the first holder is movable relative to the gear cover and the first holder cover.

[0011] A sixth aspect is the developing cartridge of the fifth aspect, wherein the first holder cover has a first recess or a first through hole, the first holder has a first boss extending in the first direction and inserted into the first recess or the first through hole, and when the first holder moves in a third direction relative to the first holder cover that intersects with the first electrical contact surface, the first boss moves in the third direction within the first recess or the first through hole.

[0012] A seventh aspect is the developing cartridge of the sixth aspect, wherein the size of the first recess or the first through hole in the third direction is larger than the size of the first boss in the third direction.

[0013] An eighth aspect is the developing cartridge according to any one of the fifth to seventh aspects, wherein the first holder cover is fixed to the gear cover by a screw inserted from an inner surface of the gear cover.

[0014] A ninth aspect is the developing cartridge according to any one of the first to eighth aspects, wherein the first holder is movable in the first direction relative to the casing.

[0015] A tenth aspect is the developing cartridge according to any one of the first to ninth aspects, wherein the first holder is movable in the second direction relative to the casing.

[0016] An eleventh aspect is the developing cartridge according to any one of the first to tenth aspects, wherein the second direction is perpendicular to the first direction.

[0017] A twelfth aspect is a developing cartridge according to any one of the first to eleventh aspects, wherein the first holder has a first outer surface located at one end of a third direction intersecting with the first electrical contact surface, and capable of holding the first electrical contact surface.

[0018] A thirteenth aspect is the developing cartridge of the twelfth aspect, wherein the first holder has a first holder groove located at the one end in the third direction.

[0019] A fourteenth aspect is the developer cartridge of the thirteenth aspect, wherein the first holder groove is located between the first protrusion and the first outer surface in the first direction.

[0020] A 15th aspect is a developing cartridge of the 13th or 14th aspect, wherein the first holder has a holder protrusion positioned away from the first outer surface in the first direction, and the first holder groove is positioned between the first outer surface and the holder protrusion in the first direction.

[0021] A sixteenth aspect is the developing cartridge according to any one of the thirteenth to fifteenth aspects, wherein the first holder is movable in the third direction relative to the casing.

[0022] A seventeenth aspect is the developing cartridge according to any one of the thirteenth to sixteenth aspects, wherein the third direction intersects with the first direction and the second direction.

[0023] An eighteenth aspect is the developing cartridge according to any one of the thirteenth to seventeenth aspects, wherein the third direction is perpendicular to the first direction and the second direction.

[0024] A 19th aspect is a developing cartridge according to any one of the 12th to 15th aspects, wherein the first holder further comprises a second outer surface located at the other end of the third direction, and an elastic member located between the first outer surface and the second outer surface, the elastic member being expandable and contractible in the third direction between a first state and a second state.

[0025] A twentieth aspect is the developing cartridge of the nineteenth aspect, in which the elastic member is a spring.

[0026] A twenty-first aspect is the developing cartridge of the nineteenth or twentieth aspect, wherein the second outer surface has a first convex curved surface.

[0027] A twenty-second aspect is the developer cartridge of the twenty-first aspect, wherein the second outer surface has a convex second curved surface that is spaced apart from the first curved surface in the first direction.

[0028] A twenty-third aspect is the developing cartridge of the twenty-second aspect, wherein the second outer surface has a second holder groove located between the first curved surface and the second curved surface in the first direction.

[0029] A twenty-fourth aspect is the developing cartridge according to any one of the first and second aspects, wherein at least a portion of the first holder is positioned in a projection area of ​​the large diameter gear in the first direction.

[0030] A 25th aspect is a developing cartridge according to any one of the first to 24th aspects, further comprising a first handle located at the other end of the casing in the second direction, and the first holder is located between the developing roller and the first handle in the second direction.

[0031] A 26th aspect is a developing cartridge according to any one of the 6th to 8th aspects, wherein the first holder is positioned between a first outer surface located at one end of the casing in the third direction and a second outer surface located at the other end of the casing in the third direction.

[0032] A twenty-seventh aspect is the developer cartridge according to any one of the twelfth to fifteenth aspects, wherein the first holder holds the developer memory on the first outer surface.

[0033] A 28th aspect is a developing cartridge according to any one of the 1st to 27th aspects, wherein the first protrusion is located between the large diameter gear and the casing in the first direction and farther from the agitator shaft than the small diameter gear.

[0034] A 29th aspect is a developing cartridge of the 5th aspect, wherein the first holder cover has a second recess or a second through hole, the first holder has a second boss having a length in the first direction and inserted into the second recess or the second through hole, and when the first holder moves relative to the first holder cover in a third direction that intersects the first electrical contact surface, the second boss moves in the third direction within the second recess or the second through hole.

[0035] A 30th aspect is the developing cartridge of the 29th aspect, wherein the size of the second recess or the second through hole in the third direction is larger than the size of the second boss in the third direction. [Effects of the Invention]

[0036] The first electrical contact surface held by the first holder is movable relative to the casing. Therefore, when the developer cartridge is attached to the image forming apparatus, rubbing of the first electrical contact surface against the main body electrical contact of the image forming apparatus can be suppressed. The agitator gear has a large diameter gear and a small diameter gear. The small diameter gear is located between the casing and the large diameter gear in the first direction. The first protrusion is located between the casing and the large diameter gear in the first direction. The first holder is located farther from the first protrusion than the large diameter gear is in the first direction. In other words, the first holder is located farther from the agitator gear in the first direction. Therefore, when the first holder is moving relative to the casing, contact of the first holder with the agitator gear can be suppressed. [Brief explanation of the drawings]

[0037] [Figure 1] 1 is an overall view of an image forming apparatus according to an embodiment; [Figure 2] FIG. 2 is a perspective view of the developing cartridge according to the embodiment. [Figure 3] FIG. 2 is a central cross-sectional view of the developing cartridge according to the embodiment. [Figure 4] 4 is a rear view showing one end portion in the first direction of the developing cartridge according to the embodiment. FIG. [Figure 5] FIG. 2 is a side view of the developing cartridge according to the embodiment. [Figure 6] FIG. 2 is a side view of the developing cartridge according to the embodiment, showing a state in which a gear cover is removed. [Figure 7] FIG. 2 is a perspective view of a first holder according to the embodiment. [Figure 8] 8 is a cross-sectional view of the first holder taken along the line AA shown in FIG. 7. [Figure 9] FIG. 2 is a perspective view showing the drum cartridge. [Figure 10] FIG. 2 is a side view of the drum cartridge. [Figure 11] FIG. 2 is a perspective view of the drum cartridge with the developing cartridge attached thereto. [Figure 12] FIG. 2 is a side view of the drum cartridge with the developer cartridge attached. [Figure 13] FIG. 2 is a partial cross-sectional view of the image forming apparatus. [Figure 14] FIG. 2 is a perspective view of a first guide frame. [Figure 15] FIG. 4 is a perspective view of a second guide frame. [Figure 16] FIG. 4 is a side view showing how the process unit is attached to the main body frame. [Figure 17] FIG. 10 is a side view showing a state in which the process unit is being removed from the main body frame. DETAILED DESCRIPTION OF THE INVENTION

[0038] Hereinafter, embodiments of the present disclosure will be described with reference to the accompanying drawings. Note that the components described in the embodiments are merely examples and are not intended to limit the scope of the present disclosure. In the drawings, the dimensions and numbers of each part may be simplified as necessary for ease of understanding.

[0039] <Image forming apparatus 100> FIG. 1 is an overall view of an image forming apparatus 100 according to an embodiment. The image forming apparatus 100 is an apparatus that forms an image on a print medium 9, such as printing paper. The image forming apparatus 100 comprises an apparatus main body 10, a developing cartridge 20, and a drum cartridge 50. The developing cartridge 20 is attachable to the drum cartridge 50. Hereinafter, a unit formed by the drum cartridge 50 with the developing cartridge 20 attached thereto will be referred to as a process unit U1. The process unit U1 is attachable to the apparatus main body 10. The apparatus main body 10 comprises a main body frame 11 and a main body substrate 13.

[0040] Hereinafter, the direction in which the rotation axis (developing roller axis A22) of the developing roller 22 in the developing cartridge 20 extends will be referred to as the "first direction." The direction in which the developing roller 22 and the first agitator 24 (see FIG. 3) are aligned will be referred to as the "second direction." The direction intersecting with the first electrical contact surface 33 provided on the developing cartridge 20 will be referred to as the "third direction." The first direction, second direction, and third direction intersect with each other, and more preferably, are perpendicular to each other.

[0041] <Main frame 11> As shown in FIG. 1 , the main body frame 11 has a box shape. The main body frame 11 has an opening 110. The opening 110 is located at the other end of the main body frame 11 in the second direction. The main body frame 11 has a lid portion 113. The lid portion 113 is located at the other end of the main body frame 11 in the second direction. The main body frame 11 has a hinge 115 at the other end of the lid portion 113 in the third direction. The lid portion 113 moves about the hinge 115 between a closed position that closes the opening 110 and an open position that opens the opening 110. The process unit U1 can be attached to the main body frame 11 with the opening 110 open.

[0042] <Main board 13> 1, the main body board 13 is located inside the main body frame 11. The main body board 13 has a processor that executes printing processing, a main body memory that stores various information, and the like.

[0043] The main body frame 11 has a guide frame 70. The guide frame 70 has a main body electrical contact 15 and a main body electrical contact 17. The configuration of the guide frame 70 will be described later.

[0044] <Main body electrical contacts 15 and 17> The main body electrical contact 17 is located closer to the opening 110 in the second direction than the main body electrical contact 15. In other words, the main body electrical contact 15 is located farther from the opening 110 in the second direction than the main body electrical contact 17. The main body substrate 13 is electrically connected to the main body electrical contact 15 and the main body electrical contact 17. When the process unit U1 is attached to the main body frame 11, the main body electrical contact 15 contacts the first electrical contact surface 33 of the developer cartridge 20, and the main body electrical contact 17 contacts the second electrical contact surface 553 of the drum cartridge 50. When the main body electrical contact 15 is electrically connected to the first electrical contact surface 33, the main body electrical contact 17 can be electrically connected to the second electrical contact surface 553. When the process unit U1 is attached to the apparatus main body 10, the developer substrate 32 (described later) is electrically connected to the main body substrate 13 via the main body electrical contact 15, and the drum substrate 552 (described later) is electrically connected to the main body substrate 13 via the main body electrical contact 17.

[0045] <Developing Cartridge 20> FIG. 2 is a perspective view of the developer cartridge 20 of the embodiment. FIG. 3 is a central cross-sectional view of the developer cartridge 20 of the embodiment. FIG. 4 is a rear view showing one end of the developer cartridge 20 of the embodiment in the first direction. FIG. 5 is a side view of the developer cartridge 20 of the embodiment. FIG. 6 is a side view of the developer cartridge 20 of the embodiment, showing a state where the gear cover has been removed. FIG. 7 is a perspective view of the first holder 34 of the embodiment. FIG. 8 is a cross-sectional view of the first holder 34 along line AA shown in FIG. 7.

[0046] As shown in FIGS. 2 and 3, the developer cartridge 20 includes a casing 21, a developer roller 22, a supply roller 23, a first agitator 24, and a second agitator 25.

[0047] <Casing 21> The casing 21 can accommodate a developer. The developer is, for example, toner. The casing 21 extends in a first direction. The casing 21 has a first outer surface 215 (see FIG. 2) and a second outer surface 216 (see FIG. 4). The first outer surface 215 is located at one end of the casing 21 in the third direction. The second outer surface 216 is located at the other end of the casing 21 in the third direction. The developer cartridge 20 has a first handle 213. The first handle 213 is located at the other end of the casing 21 in the second direction.

[0048] <Developing roller 22> 5 and 6, the developing roller 22 is rotatable about a developing roller axis A22 extending in a first direction when the developing cartridge 20 is attached to the image forming apparatus 100 (FIG. 1). The developing roller 22 is located at one end of the casing 21 in a second direction intersecting the first direction. When the developing cartridge 20 is attached to the image forming apparatus 100 (FIG. 1), the developing roller 22 supplies the developer in the casing 21 to the surface of the photosensitive drum 51 of the drum cartridge 50.

[0049] 3, the developing roller 22 includes a developing roller body 221 and a developing roller shaft 222. The developing roller body 221 has a cylindrical shape extending in a first direction. The developing roller body 221 is made of conductive rubber.

[0050] The developing roller shaft 222 has a cylindrical shape extending along the developing roller axis A22. The developing roller shaft 222 is made of metal. The developing roller shaft 222 is located inside the developing roller main body 221 in the radial direction of the developing roller main body 221. The developing roller shaft 222 penetrates the developing roller main body 221 in the first direction. It is not essential that the developing roller shaft 222 penetrates the developing roller main body 221. The developing roller shaft 222 may be attached to both ends of the developing roller main body 221 in the first direction. The developing roller 22 is rotatable about the developing roller shaft 222.

[0051] <Supply roller 23> The supply roller 23 supplies the developer in the casing 21 to the outer surface of the developing roller 22. The supply roller 23 is located inside the casing 21. The supply roller 23 contacts the developing roller 22. The supply roller 23 is rotatable about a supply roller axis that extends in the first direction.

[0052] 3, the supply roller 23 includes a supply roller body 231 and a supply roller shaft 232. The supply roller body 231 has a cylindrical shape extending in a first direction. The supply roller body 231 is made of a conductive sponge. The supply roller body 231 contacts the developing roller body 221.

[0053] <First agitator 24> The first agitator 24 is capable of agitating the developer. As shown in FIG. 3, the first agitator 24 is located within the casing 21. The first agitator 24 is rotatable about an agitator axis A24 extending in a first direction. As shown in FIG. 3, the first agitator 24 has an agitator shaft 241 and blades 243. The agitator shaft 241 extends along the agitator axis A24. The blades 243 are connected to the agitator shaft 241. The agitator shaft 241 and the blades 243 are rotatable about the agitator axis A24. The rotation of the blades 243 agitates the developer in the casing 21. The blades 243 are made of, for example, resin or film.

[0054] <Second agitator 25> The second agitator 25 is capable of agitating the developer. As shown in FIG. 3, the second agitator 25 is located inside the casing 21. The second agitator 25 is located on the other side of the first agitator 24 in the second direction. The second agitator 25 is rotatable about an agitator axis A25 extending in the first direction. The second agitator 25 includes an agitator shaft 251 and blades 253. The agitator shaft 251 extends along the agitator axis A25. The blades 253 are connected to the agitator shaft 251. The agitator shaft 251 and the blades 253 are rotatable about the agitator axis A25. The rotation of the blades 253 agitates the developer in the casing 21. The blades 253 are made of, for example, resin or film.

[0055] As shown in Figures 4 to 6, the developer cartridge 20 includes a developer coupling 26, a developer roller gear 223, a supply roller gear 233, a first idle gear 271, a second idle gear 272, a third idle gear 273, a first agitator gear 245, a second agitator gear 255, a gear cover 28, and a developer memory unit 30.

[0056] As shown in FIG. 6, the development coupling 26 is located at one end of the casing 21 in the first direction. The development coupling 26 is located between the development roller 22 and the first agitator 24 in the second direction. The development coupling 26 is rotatable about a coupling shaft A26. The coupling shaft A26 extends in the first direction. The development coupling 26 has a coupling portion 261 and a coupling gear 262. The coupling portion 261 and the coupling gear 262 may be integral with each other or may be separate bodies. The coupling portion 261 has a coupling hole recessed in the first direction.

[0057] As shown in FIG. 6, the coupling portion 261 receives power from the image forming apparatus 100 (FIG. 1) when the developer cartridge 20 is attached to the image forming apparatus 100. The coupling portion 261 is engaged with a main body coupling (not shown) of the image forming apparatus 100, thereby being rotatable about a coupling axis A26 together with the main body coupling. The coupling portion 261 has a cylindrical shape extending in the first direction. As shown in FIG. 6, the coupling gear 262 is located at one end of the casing 21 in the first direction. The coupling gear 262 is rotatable together with the coupling portion 261.

[0058] <Developing roller gear 223> 6, the developing roller gear 223 is located at one end of the casing 21 in the first direction. The developing roller gear 223 is attached to the developing roller shaft 222 and is rotatable together with the developing roller shaft 222. The developing roller gear 223 meshes with the coupling gear 262.

[0059] <Supply roller gear 233> 6, the supply roller gear 233 is located at one end of the casing 21 in the first direction. The supply roller gear 233 is attached to the supply roller shaft 232 and is rotatable together with the supply roller shaft 232. The supply roller gear 233 meshes with the coupling gear 262.

[0060] <1st Idle Gear 271> 6, the first idle gear 271 is located at one end of the casing 21 in the first direction. The first idle gear 271 is located between the second idle gear 272 and the casing 21 in the first direction. The first idle gear 271 is rotatable about an idle axis A27 extending in the first direction. The first idle gear 271 meshes with the coupling gear 262.

[0061] <Second idle gear 272> As shown in FIG. 6, the second idle gear 272 is located at one end of the casing 21 in the first direction. The second idle gear 272 is located farther from the casing 21 in the second direction than the first idle gear 271. The second idle gear 272 is located on the opposite side of the one end of the casing 21 relative to the first idle gear 271 in the second direction. The diameter of the second idle gear 272 is smaller than the diameter of the first idle gear 271. The first idle gear 271 is rotatable together with the second idle gear 272 about the idle axis A27. The first idle gear 271 and the second idle gear 272 rotate integrally. The first idle gear 271 and the second idle gear may be integral or separate.

[0062] <Third Idle Gear 273> 6, the third idle gear 273 is located at one end of the casing 21 in the first direction. The third idle gear 273 is located between a small diameter gear 249 of the first agitator gear 245 and a second agitator gear 255, which will be described later, in the second direction. The third idle gear 273 is rotatable about an idle shaft A273. The third idle gear 273 meshes with the small diameter gear 249 of the first agitator gear 245.

[0063] <First agitator gear 245> 6, the first agitator gear 245 is located at one end of the casing 21 in the first direction. The first agitator gear 245 is attached to the agitator shaft 241 of the first agitator 24. The first agitator gear 245 is rotatable together with the first agitator 24 about the agitator axis A24.

[0064] The first agitator gear 245 has a large diameter gear 247 and a small diameter gear 249. The small diameter gear 249 has a smaller diameter than the large diameter gear 247. As shown in Fig. 4, the small diameter gear 249 is located between the large diameter gear 247 and the casing 21 in the first direction. In other words, the large diameter gear 247 is located on the opposite side of the small diameter gear 249 from the casing 21 in the first direction.

[0065] <Second agitator gear 255> 6, the second agitator gear 255 is located at one end of the casing 21 in the first direction. The second agitator gear 255 is attached to the agitator shaft 251 of the second agitator 25. The second agitator gear 255 is rotatable about the agitator axis A25 together with the second agitator 25. The second agitator gear 255 meshes with the third idle gear 273.

[0066] <Protrusion 211> The casing 21 has a protrusion 211 (first protrusion). As shown in FIGS. 4 and 6, the protrusion 211 is located at one end of the casing 21 in the first direction. The protrusion 211 extends in the first direction from one end of the developing roller 22 in the first direction. The protrusion 211 is located between the casing 21 and the large diameter gear 247 in the first direction. The protrusion 211 is located away from the small diameter gear 249 in the second direction. The protrusion 211 is movable together with the casing 21. The protrusion 211 may be integral with the casing 21 or may be a separate body. The protrusion 211 is located away from the agitator shaft A24 than the small diameter gear 249 (see FIG. 4). The protrusion 211 does not contact the first agitator gear 245.

[0067] When the developer cartridge 20 is attached to the drum cartridge 50 (see FIG. 9), the protrusion 211 is pressed by the drum cartridge 50 toward the photosensitive drum 51 in the second direction. The protrusion 211 is configured to receive a pressing force from the other end of the casing 21 toward one end of the casing 21 in the second direction.

[0068] <Protrusion 212> The casing 21 has a protrusion 212. As shown in FIGS. 4 and 6, the protrusion 212 extends in the first direction from one end of the developing roller 22 in the first direction. The protrusion 212 is located between the casing 21 and the large diameter gear 247 in the first direction. The protrusion 212 is located away from the small diameter gear 249 in the second direction. The protrusion 212 is movable together with the casing 21. The protrusion 212 may be integral with the casing 21 or may be a separate body. The protrusion 212 is located farther from the agitator shaft A24 than the small diameter gear 249 (see FIG. 4).

[0069] The protrusion 212 prevents the development memory unit 30 from being erroneously attached to an incompatible drum cartridge. That is, when the development cartridge 20 is attached to a compatible drum cartridge 50, the protrusion 212 fits into a recess (not shown) in the drum cartridge 50. On the other hand, when the development cartridge 20 is attached to an incompatible drum cartridge, the protrusion 212 comes into contact with a part of the drum cartridge. This prevents the development memory unit 30 from being attached to an incompatible drum cartridge.

[0070] <Gear Cover 28> 2 and 5, the gear cover 28 covers the coupling gear 262, the supply roller gear 233, the first idle gear 271, the second idle gear 272, the third idle gear 273, the first agitator gear 245, and the second agitator gear 255. Note that the gear cover 28 does not need to cover all of the gears, and may cover only a portion of each gear. The gear cover 28 is fixed to one end of the casing 21 in the first direction.

[0071] <Development memory unit 30> The developing memory unit 30 has a developing memory 31, a first holder 34, and a first holder cover 35. As shown in Fig. 4, the developing memory unit 30 is located at one end of the gear cover 28 in the first direction.

[0072] <Development Memory 31> The development memory 31 stores various information related to the development cartridge 20. The development memory 31 stores, for example, ID information and lifespan information. The ID information is identification information for identifying each development cartridge 20, and specifically, a serial number. The lifespan information includes, for example, the cumulative number of rotations of the development roller 22, the cumulative number of pages printed using the development roller 22, and the cumulative number of dots.

[0073] The developing memory 31 has a developing substrate 32 and a first electrical contact surface 33. The developing substrate 32 is located at one end of the first holder 34 in the third direction. The developing substrate 32 is a plate-shaped member.

[0074] <First electrical contact surface 33> The first electrical contact surface 33 is located at one end of the developer substrate 32 in the third direction. The first electrical contact surface 33 includes four thin plate-shaped electrodes. The first electrical contact surface 33 is electrically connected to the developer memory 31. As shown in FIG. 1 , when the developer cartridge 20 is attached to the main body frame 11, the first electrical contact surface 33 is parallel to a second direction that intersects with the third direction. The first electrical contact surface 33 is movable relative to the casing 21 in the first direction, the second direction, and the third direction.

[0075] <First holder 34> 4, the first holder 34 is located at one end of the casing 21 in the first direction. The first holder 34 is located farther from the protrusions 211 and 212 in the first direction than the large diameter gear 247. The first holder 34 is located farther from the large diameter gear 247 in the first direction than the gear cover 28. The first holder 34 is located farther from the casing 21 in the first direction than the first agitator gear 245.

[0076] 2, the first holder 34 is located between the developing roller 22 and the first handle 213 in the second direction. As shown in FIG. 6, at least a portion of the first holder 34 is located in a projection area of ​​the large diameter gear 247 in the first direction. As shown in FIGS. 5 and 6, the first holder 34 is located between the first outer surface 215 and the second outer surface 216 of the casing 21 in the third direction.

[0077] The first holder 34 holds the developer substrate 32, thereby holding the first electrical contact surface 33. Specifically, as shown in FIG. 7 , the first holder 34 has a first outer surface 413 located at one end in the third direction. The first outer surface 413 has a recess into which the developer substrate 32 can be inserted. The developer substrate 32 is fixed to the first outer surface 413, for example, via an adhesive. The first outer surface 413 can hold the developer memory 31. In other words, the first outer surface 413 can hold the developer substrate 32, thereby holding the developer memory 31 and the first electrical contact surface 33.

[0078] <First holder cover 35> The first holder cover 35 is located at one end of the gear cover 28 in the first direction. As shown in FIG. 4 , the first holder cover 35 is located farther from one end of the casing 21 in the first direction than the first agitator gear 245 is. The first holder cover 35 has a generally rectangular cylindrical shape that surrounds the periphery of the first holder 34 together with the gear cover 28. The first holder cover 35 has a U-shape that surrounds one side of the first holder 34 in the first direction, one side of the first holder 34 in the second direction, and the other side of the first holder 34 in the second direction. The first holder cover 35 holds the first holder 34. The first holder 34 is movable relative to the first holder cover 35 in the first direction, the second direction, and the third direction.

[0079] 4, the first holder cover 35 has a first plate portion 351. The first plate portion 351 is located on one side away from the gear cover 28 in the first direction. The first holder 34 is located between the first plate portion 351 and the gear cover 28.

[0080] 4, the first holder cover 35 is fixed to the gear cover 28 by two screws 353, 353 inserted from the inner surface of the gear cover 28. The two screws 353, 353 fix the first holder cover 35 to the gear cover 28 at positions spaced apart in the second direction. Note that the first holder cover 35 may be fixed to the gear cover 28 by one screw 353 or three or more screws 353.

[0081] As shown in FIGS. 4 and 5, the first holder cover 35 has a through hole 354 (first through hole). As shown in FIG. 4, the gear cover 28 has through holes 355 and 356. The through hole 354 is located in the first plate portion 351. The through hole 354 extends toward one side in the second direction and toward one side in the third direction. The through holes 355 and 356 are located in the gear cover 28. The through holes 355 and 356 may have the same shape as the through hole 354 or may have a different shape.

[0082] The first holder 34 is movable relative to the casing 21. The first electrical contact surface 33 held by the first holder 34 is also movable relative to the casing 21. The first holder 34 is movable relative to the gear cover 28.

[0083] 4 and 7, the first holder 34 has a first boss 411, a second boss 412, and a third boss 417 extending in the first direction. As shown in FIG. 7, the first boss 411 is located at one end of the first holder 34 in the first direction. The second boss 412 and the third boss 417 are located at the other end of the first holder 34 in the first direction. The third boss 417 is located away from the second boss 412 on one side in the third direction. In the third direction, the first boss 411 is located between the second boss 412 and the third boss 417.

[0084] The first boss 411 is inserted into the through hole 354 with sufficient space. The second boss 412 is inserted into the through hole 355 with sufficient space. The third boss 417 is inserted into the through hole 356 with sufficient space. As shown in FIGS. 5 and 6 , the size of the through hole 354 in the third direction is larger than the size of the first boss 411 in the third direction. When the first holder 34 moves in the third direction relative to the first holder cover 35, the first boss 411 moves in the third direction inside the through hole 354. Furthermore, the size of the through hole 355 in the third direction is larger than the size of the second boss 412 in the third direction. When the first holder 34 moves in the third direction relative to the first holder cover 35, the second boss 412 moves in the third direction inside the through hole 355.

[0085] 5, the through hole 354 also extends in the second direction. The size of the through hole 354 in the second direction is larger than the size of the first boss 411 in the second direction. When the first holder 34 moves in the second direction relative to the first holder cover 35, the first boss 411 moves in the second direction inside the through hole 354. Therefore, the first holder 34 is movable in the second direction relative to the casing 21.

[0086] Note that through hole 354 may be a recessed portion (first recess) into which the end of first boss 411 can be inserted. Like through hole 354, through hole 355 may also be a recessed portion (second recess) into which the end of second boss 412 can be inserted. Furthermore, through hole 356 may also be a recessed portion into which the end of third boss 417 can be inserted.

[0087] The first holder cover 35 may also have a second plate portion located between the first holder 34 and the gear cover 28. The second boss 412 and the third boss 417 may be inserted into two through holes located in the second plate portion. The through holes in the second plate portion are continuous with the through holes 355, 356 of the gear cover 28. Note that by not providing the second plate portion in the first holder cover 35, the first holder cover 35 can be made smaller.

[0088] <Holder groove 414> 7, the first holder 34 has a holder groove 414 (first holder groove). The holder groove 414 is located at one end of the first holder 34 in the third direction. The holder groove 414 is located between the protrusion 211 and the first outer surface 413 in the first direction. The holder groove 414 is located between the protrusion 212 and the first outer surface 413 in the first direction.

[0089] 7, the first holder 34 has a holder protrusion 415 that is spaced apart from the first outer surface 413 in the first direction. The holder groove 414 is located between the first outer surface 413 and the holder protrusion 415 in the first direction.

[0090] 7 and 8, the first holder 34 has a first member 41 and a second member 43. The second member 43 is located on the other side of the first member 41 in the third direction. The first outer surface 413 is located at one end of the first member 41 in the third direction. The first member 41 has a tubular portion 416 at the other end in the third direction. The tubular portion 416 has a rectangular tubular shape extending in the third direction.

[0091] As shown in FIGS. 7 and 8, the second member 43 has a main body portion 431, a claw portion 432, a protrusion portion 433, and a protrusion portion 434. As shown in FIG. 8, the main body portion 431 extends in the third direction and has a rectangular cylindrical shape with a bottom portion on the other side of the third direction. The main body portion 431 is inserted inside the tubular portion 416. The second member 43 is movable in the third direction relative to the first member 41. As shown in FIG. 7, the tip of the claw portion 432 is inserted into the through-hole of the tubular portion 416 of the first member 41. This prevents the second member 43 from coming off the first member 41.

[0092] The protrusions 433, 434 protrude from the other end of the main body 431 in the third direction toward the other side in the third direction. The protrusion 434 is located away from the protrusion 433 on the other side in the first direction. In other words, the protrusion 434 is located closer to one end of the casing 21 in the first direction than the protrusion 433. The protrusion 434 is located closer to the gear cover 28 than the protrusion 433. The protrusion 433 has a curved surface 436 (first curved surface). The protrusion 434 has a curved surface 437 (second curved surface). The curved surface 437 is located away from the curved surface 436 on the other side in the first direction. In other words, the curved surface 437 is located closer to one end of the casing 21 in the first direction than the curved surface 436. The curved surface 437 is located closer to the gear cover 28 than the curved surface 436. Curved surface 436 and curved surface 437 constitute second outer surface 435 located at the other end of first holder 34 in the third direction. Second outer surface 435 is located at the other end of second member 43 in the third direction. Second outer surface 435 has holder groove 438 (second holder groove). Holder groove 438 is located between curved surface 436 and curved surface 437 in the first direction.

[0093] <Elastic member 45> As shown in FIGS. 7 and 8, the first holder 34 has an elastic member 45. The elastic member 45 is located between the first outer surface 413 and the second outer surface 435. The elastic member 45 is a helical spring. The elastic member 45 is expandable and contractible between a first state and a second state. Specifically, as shown in FIG. 8, the elastic member 45 is located within the tubular portion 416 of the first member 41 and within the main body portion 431 of the second member 43. One end of the elastic member 45 in the third direction is in contact with the first member 41, and the other end of the elastic member 45 in the third direction is in contact with the second member 43.

[0094] When the first holder 34 is contracted in the third direction, the elastic member 45 contracts in the third direction, generating an elastic force (restoring force). The elastic member 45 urges the second member 43 in a direction (the other direction) away from the first member 41 in the third direction by the elastic force. The first holder 34 is expandable and contractible in the third direction by the elastic member 45.

[0095] As shown in FIG. 1, when the process unit U1 is attached to the main body frame 11, the elastic force of the elastic member 45 allows the first holder 34 to bring the first electrical contact surface 33 into good contact with the main body electrical contact 15 of the device main body 10.

[0096] The protrusion 211 is movable together with the casing 21. Therefore, the casing 21 and the developing roller 22 can be positioned by pressing the protrusion 211. The first holder 34 and the first electrical contact surface 33 are movable relative to the casing 21. Therefore, regardless of the positions of the casing 21 and the developing roller 22, the first electrical contact surface 33 can be positioned at a position where it can come into contact with the main body electrical contact 15.

[0097] The first electrical contact surface 33 held by the first holder 34 is movable relative to the casing 21. Therefore, when the developing cartridge 20 is attached to the apparatus main body 10, rubbing of the first electrical contact surface 33 against the main body electrical contact 15 can be suppressed.

[0098] The first agitator gear 245 has a large diameter gear 247 and a small diameter gear 249. The small diameter gear 249 is located between the casing 21 and the large diameter gear 247 in the first direction. The protrusion 211 is located between the casing 21 and the large diameter gear 247 in the first direction. The first holder 34 is located farther from the protrusion 211 than the large diameter gear 247 is located in the first direction. That is, the first holder 34 is located farther from the first agitator gear 245 in the first direction. Therefore, when the first holder 34 is moving relative to the casing 21, it is possible to prevent the first holder 34 from coming into contact with the first agitator gear 245.

[0099] <Drum Cartridge 50> Fig. 9 is a perspective view showing the drum cartridge 50. Fig. 10 is a side view of the drum cartridge 50. Fig. 11 is a perspective view of the drum cartridge 50 with the developer cartridge 20 attached. Fig. 12 is a side view of the drum cartridge 50 with the developer cartridge 20 attached.

[0100] The drum cartridge 50 can be attached to the main body frame 11 (see FIG. 1). More specifically, with the developer cartridge 20 attached to the drum cartridge 50, the drum cartridge 50 can be attached to the main body frame 11. The drum cartridge 50 has a photosensitive drum 51, a drum frame 53, and a drum memory unit 55.

[0101] As shown in FIG. 12 , the photosensitive drum 51 contacts the developing roller 22 when the developer cartridge 20 is attached to the drum cartridge 50. The photosensitive drum 51 is rotatable about a drum axis A51 extending in a first direction. The photosensitive drum 51 includes a drum main body 511 and a drum shaft 513. The drum main body 511 has a cylindrical shape extending in the first direction. The drum shaft 513 has a cylindrical shape extending along the drum axis A51. The drum shaft 513 is made of metal. The drum shaft 513 is located inside the drum main body 511 in the radial direction of the drum main body 511. The drum shaft 513 penetrates the drum main body 511 in the first direction. It is not essential that the drum shaft 513 penetrates the drum main body 511. The drum shaft 513 may be attached to both ends of the drum main body 511 in the first direction. The photosensitive drum 51 is rotatable about the drum shaft 513.

[0102] The drum frame 53 rotatably supports the photosensitive drum 51. The photosensitive drum 51 is located closer to one end of the drum frame 53 in the second direction than to the other end of the drum frame 53 in the second direction. As shown in FIG. 9 , the drum frame 53 has a first side plate 531 and a second side plate 532. The first side plate 531 is located at one end of the drum frame 53 in the first direction. The second side plate 532 is located at the other end of the drum frame 53 in the first direction. The photosensitive drum 51 is held between the first side plate 531 and the second side plate 532. The first side plate 531 and the second side plate 532 extend in the second direction.

[0103] 11 , when the developer cartridge 20 is attached to the drum cartridge 50, the first side plate 531 is located on one side of the gear cover 28 in the first direction. In other words, when the developer cartridge 20 is attached to the drum cartridge 50, the first side plate 531 is located farther from one end of the casing 21 in the first direction than the gear cover 28. The first side plate 531 covers at least a portion of the gear cover 28.

[0104] <Drum Memory Unit 55> The drum memory unit 55 is located at one end of the drum frame 53 in the first direction. The drum memory unit 55 includes a drum memory 551, a second holder 554, and a second holder cover 555.

[0105] The drum memory unit 55 is located outside the drum frame 53. Specifically, the drum memory unit 55 is located on one side of the first side plate 531 of the drum frame 53 in the first direction. In other words, the drum base plate 552 including the drum memory 551 and the second electrical contact surface 553, the second holder 554, and the second holder cover 555 are located outside the drum frame 53 in the first direction.

[0106] <Drum Memory 551> The drum memory 551 stores various information related to the drum cartridge 50. The drum memory 551 stores, for example, ID information and lifespan information. The ID information is identification information for identifying each drum cartridge 50, and is specifically a serial number. The lifespan information includes, for example, the cumulative number of rotations of the photosensitive drum 51 and the cumulative number of pages printed using the photosensitive drum 51.

[0107] The drum memory 551 has a drum substrate 552 and a second electrical contact surface 553. The drum substrate 552 is located at one end of the second holder 554 in the third direction. The drum substrate 552 is a plate-shaped member.

[0108] <Second electrical contact surface 553> The second electrical contact surface 553 includes four thin-plate electrodes. The second electrical contact surface 553 is electrically connected to the drum memory 551. As shown in FIG. 1 , when the drum cartridge 50 is attached to the main body frame 11, the second electrical contact surface 553 is parallel to a second direction that intersects with the third direction. The second electrical contact surface 553 is movable relative to the drum frame 53 in the first direction, the second direction, and the third direction.

[0109] <Second holder 554> 9, the second holder 554 is positioned in the first direction away from one end of the drum frame 53 in the first direction. The second holder 554 is movable in the first direction, the second direction, and the third direction relative to the drum frame 53. When the developer cartridge 20 is attached to the drum cartridge 50, the second holder 554 is movable in the first direction, the second direction, and the third direction relative to the casing 21.

[0110] The second holder 554 is extendable in the third direction. The configuration for extending and contracting the second holder 554 is the same as the configuration for extending and contracting the first holder 34. Specifically, as shown in FIG. 10 , the second holder 554 has a first member 61 and a second member 63. The second member 63 is located on the other side of the first member 61 in the third direction. Specifically, the first member 61 has a tubular portion 611. The tubular portion 611 is located at the other end of the first member 61 in the third direction. The tubular portion 611 has a rectangular tubular shape extending in the third direction. One end of the second member 63 in the third direction is inserted inside the tubular portion 611.

[0111] The second member 63 is movable in the third direction relative to the first member 61. However, the second member 63 has claw portions (not shown). The second member 63 is prevented from coming off the first member 61 by the claw portions. The second holder 554 has an elastic member (not shown). The elastic member is located between the first member 61 and the second member 63. The elastic member biases the first member 61 and the second member 63 in directions that move them away from each other in the third direction. This allows the second holder 554 to expand and contract in the third direction.

[0112] The second holder 554 holds the drum substrate 552, thereby holding the second electrical contact surface 553. The configuration of the second holder 554 for holding the drum substrate 552 is the same as the configuration of the first holder 34 for holding the development substrate 32. Specifically, as shown in FIGS. 9 and 10 , the second holder 554 has a first outer surface 613 located at one end in the third direction. The first outer surface 613 is located at one end of the first member 61 in the third direction. The first outer surface 613 has a recess into which the drum substrate 552 can be inserted. The first outer surface 613 can hold the drum memory 551 and the second electrical contact surface 553 by holding the drum substrate 552.

[0113] The second holder 554 has a protrusion 633. The protrusion 633 is located at the other end of the second holder 554 in the third direction. The protrusion 633 is located at the other end of the second member 63 in the third direction. The protrusion 633 has an outer surface 635. The outer surface 635 is located at the other end of the second member 63 in the third direction. The outer surface 635 has a curved surface.

[0114] <Second holder cover 555> The second holder cover 555 is fixed to one end of the first side plate 531 in the first direction. Similar to the first holder cover 35, the second holder cover 555 has a rectangular cylindrical shape that surrounds the periphery of the second holder 554. The second holder cover 555 holds the second holder 554.

[0115] The structure of the second holder cover 555 for holding the second holder 554 is the same as the structure of the first holder cover 35 for holding the first holder 34. That is, the first boss 615 provided on the second holder 554 is inserted into the through-hole 65 provided in the second holder cover 555 with ample space. The through-hole 65 extends toward one side in the second direction and one side in the third direction. The second holder 554 is movable relative to the second holder cover 555 in the first direction, the second direction, and the third direction.

[0116] 11 and 12, in the process unit U1, the drum memory unit 55 is located between the photosensitive drum 51 and the first handle 213 of the developer cartridge 20. In the process unit U1, the drum memory 551, the drum substrate 552, the electrical contact surface 553, and the second holder 554 are located between the photosensitive drum 51 and the first handle 213. In the process unit U1, the second electrical contact surface 553 and the drum memory unit 55 are located between the photosensitive drum 51 and the other end of the casing 21 in the second direction.

[0117] In the process unit U1 (that is, in a state in which the developing cartridge 20 is attached to the drum frame 53), the first holder 34 is movable relative to the drum frame 53 in the third direction.

[0118] 11, in the process unit U1, the casing 21 of the developer cartridge 20 is located inside the drum frame 53 of the drum cartridge 50. More specifically, in the process unit U1, the casing 21 is located between the first side plate 531 and the second side plate 532.

[0119] In the process unit U1, the developer memory unit 30 of the developer cartridge 20 is located on one side of the first side plate 531 in the first direction. That is, the developer board 32 and the first holder 34 of the developer memory unit 30 are located outside the drum cartridge 50. In detail, in the process unit U1, the developer board 32, the first electrical contact surface 33, and the first holder 34 are located farther from the second side plate 532 than the first side plate 531 in the first direction.

[0120] In the process unit U1, the first electrical contact surface 33 is located farther in the first direction from one end of the casing 21 in the first direction than one end of the drum frame 53 in the first direction. In the process unit U1, the first electrical contact surface 33 is located outside the drum frame 53 in the first direction.

[0121] In the process unit U1, the development memory unit 30 is located between the development roller 22 and the drum memory unit 55 in the second direction. That is, the first electrical contact surface 33 is located between the development roller 22 and the second electrical contact surface 553 in the second direction. This prevents the first electrical contact surface 33 from interfering with the installation of the development memory unit 30 into the drum cartridge 50.

[0122] In the process unit U1, the first electrical contact surface 33 and the second electrical contact surface 553 face one side of the third direction. In the process unit U1, the first electrical contact surface 33 and the second electrical contact surface 553 are parallel to a second direction that intersects with the third direction. In the process unit U1, the first electrical contact surface 33 is located between the development coupling 26 and the second electrical contact surface 553 in the second direction.

[0123] In the process unit U1, the casing 21 of the developer cartridge 20 is located inside the drum frame 53, and the first electrical contact surface 33 of the developer memory 31 is located outside the drum frame 53. In this case, the thickness of the process unit U1 in the third direction can be made thinner than when the first electrical contact surface 33 is located inside the drum frame 53. Furthermore, the first electrical contact surface 33 and the second electrical contact surface 553 are located on the same side in the first direction. In this case, the process unit U1 can be made smaller in size in the first direction. Furthermore, the first electrical contact surface 33 is located between the developer roller 22 and the second electrical contact surface 553 in the second direction. This allows the developer roller 22 and the first electrical contact surface 33 to be closer to each other in the second direction. Therefore, the developer cartridge 20 can be made smaller in size in the second direction.

[0124] In the process unit U1, the first electrical contact surface 33 is located between the developing roller 22 and the second electrical contact surface 553 in the third direction. Therefore, as shown in FIG. 1, when the process unit U1 is attached to the main body frame 11, the first holder 34 can be moved so that the first holder 34 and the first electrical contact surface 33 held by the first holder 34 do not accidentally come into contact with the main body electrical contact 17.

[0125] As shown in FIG. 12, in the process unit U1, the length of the first holder 34 in the third direction is shorter than the length of the second holder 554 in the third direction.

[0126] 1, in the process unit U1, the first distance LE1 between the first holder 34 and the second holder 554 in the second direction is shorter than the second distance LE2 between the developing roller 22 and the first holder 34 in the second direction. That is, in the process unit U1, the first electrical contact surface 33 is located closer to the second electrical contact surface 553 than to the developing roller 22 in the second direction. Therefore, in the apparatus main body 10, the main body electrical contact 15 with which the first electrical contact surface 33 comes into contact is located closer to the main body electrical contact 17 with which the second electrical contact surface 553 comes into contact than to the developing roller 22 in the second direction.

[0127] <Guide frame 70> Figure 13 is a partial cross-sectional view of the image forming apparatus 100. As shown in Figure 13, the main body frame 11 has a guide frame 70. The guide frame 70 guides the drum cartridge 50 when the process unit U1 is attached to the main body frame 11 through the opening 110. The guide frame 70 guides one end of the drum cartridge 50 in the first direction. The guide frame 70 guides one end of the drum shaft 513 in the first direction.

[0128] <First guide frame 71 and second guide frame 73> 13, the guide frame 70 has a first guide frame 71 and a second guide frame 73. The first guide frame 71 faces the second guide frame 73 in the third direction. The third direction is the opposing direction in which the first guide frame 71 and the second guide frame 73 face each other. The main body electrical contacts 15 and 17 are located on the first guide frame 71.

[0129] Fig. 14 is a perspective view of the first guide frame 71. Fig. 14 is a diagram showing the inside of one end of the main body frame 11 in the first direction as viewed from the other side in the third direction. Fig. 15 is a perspective view of the second guide frame 73. Fig. 15 is a diagram showing the inside of one end of the main body frame 11 in the first direction as viewed from one side in the third direction.

[0130] 14 and 15 , the first guide frame 71 and the second guide frame 73 have a plate shape that stands up in the first direction with respect to an inner surface 117 of the main body frame 11 that intersects with the first direction. In other words, the first guide frame 71 and the second guide frame 73 have a plate shape that extends in the first direction from the inner surface 117. The first guide frame 71 and the second guide frame 73 extend toward one side in the second direction and the other side in the third direction while bending appropriately at predetermined positions.

[0131] As shown in FIG. 13, the distance between the first guide frame 71 and the second guide frame 73 decreases as they approach the main body electrical contacts 15 from the opening 110 in the mounting direction (second direction).

[0132] By increasing the distance between the first guide frame 71 and the second guide frame 73 toward the front (the opening 110 side) and decreasing it toward the back (the main body electrical contact 15 side), the process unit U1 can be gradually positioned. Furthermore, by decreasing the distance between the first guide frame 71 and the second guide frame 73 toward the back, it is possible to prevent the first electrical contact surface 33 on the front side from accidentally hitting the main body electrical contact 17 on the opening 110 side when attaching the process unit U1 to the main body frame 11. Furthermore, the first holder 34 is movable relative to the casing 21 in the third direction, and the second holder 554 is movable relative to the drum frame 53 in the third direction. Therefore, when attaching the process unit U1 to the main body frame 11, it is possible to reduce friction between the first electrical contact surface 33 held by the first holder 34 and the second electrical contact surface 553 held by the second holder 554 and part of the main body frame 11.

[0133] <First guide part> 13 to 15, the second guide frame 73 has a groove 731 into which the protrusions 433 and 434 of the first holder 34 fit. The groove 731 is an example of a first guide portion that guides the other end of the first holder 34 in the third direction when the process unit U1 is attached to the main body frame 11.

[0134] <Second guide part> 13 to 15, the second guide frame 73 has a groove 733 into which the protrusion 633 fits. The groove 733 is an example of a second guide portion that guides the other end of the second holder 554 in the third direction when the process unit U1 is attached to the main body frame 11.

[0135] The body electrical contact 15 intersects with the third direction. Specifically, the body electrical contact 15 has four contact portions that respectively contact the four electrodes of the first electrical contact surface 33. The four contact portions are located in the same plane that is parallel to the second direction that intersects with the third direction. Like the body electrical contact 15, the body electrical contact 17 also intersects with the third direction.

[0136] When the process unit U1 is mounted on the main body frame 11, the first holder 34 and the second holder 554 are mounted between the first guide frame 71 and the second guide frame 73, facing one side in the second direction.

[0137] 13, when the process unit U1 is attached to the main body frame 11, the main body frame 11 holds the first holder 34 between the main body electrical contact 15 and the second guide frame 73 in the third direction. As shown in FIG. 13, when the process unit U1 is attached to the main body frame 11, the main body frame 11 holds the second holder 554 between the main body electrical contact 17 and the second guide frame 73 in the third direction. In other words, when the process unit U1 is attached to the main body frame 11, the second holder 554 is held between the main body electrical contact 17 and the second guide frame 73.

[0138] 14 and 15, the first guide frame 71 has protrusions 711 and 713. The protrusions 711 and 713 protrude in the other direction in the third direction and have a plate shape extending in the second direction. As shown in FIG. 14, the protrusion 711 is located at the other end of the main body electrical contact 15 in the first direction. As shown in FIG. 14, the protrusion 713 is located at the other end of the main body electrical contact 17 in the first direction.

[0139] When the process unit U1 is attached to the main body frame 11 in the second direction, the convex portion 711 fits into the holder groove 414 (see FIG. 7) of the first holder 34. As a result, the first holder 34 moves in the second direction while being guided by the convex portion 711. The second holder 554 has a holder groove at one end in the third direction. When the process unit U1 is attached to the main body frame 11 in the second direction, the convex portion 713 fits into the holder groove of the second holder 554. As a result, the second holder 554 moves in the second direction while being guided by the convex portion 713.

[0140] As shown in FIGS. 13 to 15, the first guide frame 71 has inclined surfaces 715, 717. The inclined surface 715 is located between the main body electrical contacts 15 and 17 in the second direction. The inclined surface 717 is located on the other side (the opening 110 side) of the main body electrical contact 17 in the second direction. The inclined surfaces 715, 717 are inclined toward the second guide frame 73 on one side in the second direction. In other words, the inclined surfaces 715, 717 are inclined in the second direction so as to approach the second guide frame 73 as they move away from the opening 110.

[0141] 13 and 15, the second guide frame 73 has inclined surfaces 735, 737. The inclined surface 735 is located on the other side of the groove 731 in the second direction and is connected to the groove 731. The inclined surface 737 is located on the other side of the groove 733 in the second direction and is connected to the groove 733. The inclined surfaces 735, 737 are inclined toward the first guide frame 71 on one side in the second direction. In other words, the inclined surfaces 735, 737 are inclined in the second direction so as to approach the first guide frame 71 as they move away from the opening 110.

[0142] As shown in FIG. 13 , the distance between the first guide frame 71 and the second guide frame 73 in the third direction decreases to a third distance LE3 toward one side in the second direction, between the body electrical contact 15 and the body electrical contact 17 in the second direction. Specifically, the distance in the third direction between one end of the inclined surface 715 in the second direction and one end of the inclined surface 735 in the second direction is the third distance LE3. The groove 731 facing the body electrical contact 15 in the third direction is recessed toward the other side in the third direction. Therefore, the distance between the body electrical contact 15 and the second guide frame 73 in the third direction is greater than the third distance LE3. Therefore, when inserting the process unit U1 into the body frame 11, the first holder 34 first contracts to the third distance LE3 in the third direction and then finally expands, thereby bringing the first electrical contact surface 33 into contact with the body electrical contact 15. Therefore, once the first holder 34 is fitted into the groove 731, it is difficult for it to come off the guide frame 70. Furthermore, rubbing of the first electrical contact surface 33 due to contact with the main body electrical contact 15 can be suppressed.

[0143] As shown in FIG. 13 , on the other side of the body electrical contact 17 in the second direction, the distance between the first guide frame 71 and the second guide frame 73 in the third direction decreases to a fourth distance LE4 toward one side in the second direction. Specifically, the distance between one end of the inclined surface 717 in the second direction and one end of the inclined surface 737 in the second direction is the fourth distance LE4. The groove 733 facing the body electrical contact 17 in the third direction is recessed toward the other side in the third direction. Therefore, the distance between the body electrical contact 17 and the second guide frame 73 in the third direction is greater than the fourth distance LE4. Therefore, when the process unit U1 is inserted into the body frame 11, the second holder 554 first decreases to the fourth distance LE4 in the third direction and then finally expands, thereby causing the second electrical contact surface 553 to contact the body electrical contact 17. Therefore, once second holder 554 is fitted into groove 733, it is difficult for second holder 554 to come off guide frame 70. Also, rubbing of second electrical contact surface 553 due to contact with main body electrical contact 17 can be suppressed.

[0144] The third distance LE3 is shorter than the fourth distance LE4. This allows the first holder 34 to move between the main body electrical contact 17 and the second guide frame 73 when the process unit U1 is attached to the main body frame 11.

[0145] When the process unit U1 is not attached to the main body frame 11, the length of the first holder 34 in the third direction is shorter than the length of the second holder 554 in the third direction. This allows the first holder 34 to be moved so as not to interfere with the main body electrical contacts 17 when attaching the process unit U1 to the main body frame 11.

[0146] In the image forming apparatus 100, the first holder 34 and the second holder 554 are located on the same side, so the first electrical contact surface 33 and the second electrical contact surface 553 are located on the same side. This allows the main body electrical contacts 15, which the first electrical contact surface contacts, and the main body electrical contacts 17, which the second electrical contact surface 553 contacts, to be located on the same side in the apparatus main body 10, making it possible to reduce the size of the apparatus main body 10. Furthermore, the wiring for connecting the main body electrical contacts 15 and the main body electrical contacts 17 to the main body substrate 13 can be located on one side in the second direction. This allows the apparatus main body 10 to be reduced in size.

[0147] According to the image forming apparatus 100, the first holder 34 is located between the developing roller 22 and the second holder 554. This allows the developer cartridge 20 to be made smaller in size in the second direction. Furthermore, the process unit U1 can be made smaller than when the first holder 34 is located farther from the developing roller 22 than the second holder 554.

[0148] <Installing the Process Unit U1> Figure 16 is a side view showing how the process unit U1 is attached to the main body frame 11. Figures 16(A) and 16(B) show the process unit U1 before it is attached to the main body frame 11, and Figure 16(C) shows the process unit U1 after it has been attached to the main body frame 11.

[0149] When the process unit U1 is inserted into the main body frame 11, as shown in FIG. 16(A), the other end of the first holder 34 in the third direction and the other end of the second holder 554 in the third direction come into contact with the second guide frame 73 of the guide frame 70. At the time shown in FIG. 16(A), the first holder 34 and the second holder 554 are in their most extended states in the third direction. When the process unit U1 is further moved in the second direction, one end of the first holder 34 in the third direction and one end of the second holder 554 in the third direction come into contact with the first guide frame 71.

[0150] The process unit U1 is moved in one direction in the second direction from the position shown in FIG. 16(A). This causes the first holder 34 and the second holder 554 to come into contact with the inclined surfaces 715 and 717 of the first guide frame 71 and the inclined surfaces 735 and 737 of the second guide frame 73, respectively. This causes the first holder 34 and the second holder 554 to move in one direction in the second direction while contracting in the third direction. Then, as shown in FIG. 16(B), when the convex portion 433 of the first holder 34 reaches the other end of the groove 731 in the second direction, the convex portion 633 of the second holder 554 reaches the other end of the groove 733 in the second direction. At this time, the first holder 34 and the second holder 554 are in their most contracted state in the third direction.

[0151] The process unit U1 is moved in one direction in the second direction from the position shown in FIG. 16(B). Then, as shown in FIG. 16(C), the protrusions 433 and 633 climb over the inclined surfaces 735 and 737 of the second guide frame 73 and fit into the grooves 731 and 733, respectively. At this time, the first holder 34 and the second holder 554 extend in the third direction from their most compressed state (FIG. 16(B)) by the depth of the grooves 731 and 733. This fixes the first holder 34 and the second holder 554 in a fixed position by the guide frame 70. Furthermore, the first electrical contact surface 33 electrically connects with the main body electrical contact 15, and the second electrical contact surface 553 electrically connects with the main body electrical contact 17.

[0152] <Removing the process unit U1> Figure 17 is a side view showing the process unit U1 being removed from the main body frame 11. Figure 17(A) shows the process unit U1 attached to the main body frame 11, and Figures 17(B) and 17(C) show the process unit U1 removed from the main body frame 11.

[0153] The process unit U1 is moved in the other direction in the second direction from the position shown in Fig. 17(A). Then, as shown in Fig. 17(B), the convex portion 433 of the first holder 34 and the convex portion 633 of the second holder 554 climb over the grooves 731 and 733 in the second guide frame 73, respectively, and move to the inclined surfaces 735 and 737. This releases the first holder 34 and the second holder 554 from the guide frame 70. Furthermore, the electrical connection between the first electrical contact surface 33 and the main body electrical contact 15 and the electrical connection between the second electrical contact surface 553 and the main body electrical contact 17 are released.

[0154] The process unit U1 is moved in the other direction in the second direction from the position shown in Fig. 17(B). As a result, the first holder 34 and the second holder 554 move away from the first guide frame 71, as shown in Fig. 17(C). As a result, the first holder 34 and the second holder 554 are in the most extended state in the third direction.

[0155] It is not essential that the developer cartridge 20 includes the developer roller 22. For example, the developer roller 22 may be provided in the drum cartridge 50.

[0156] In the process unit U1, the first electrical contact surface 33 is located between the developing roller 22 and the second electrical contact surface 553 in the second direction. However, in the process unit U1, the first electrical contact surface 33 may be located on the other side of the second electrical contact surface 553 in the second direction. In other words, the second electrical contact surface 553 may be located between the developing roller 22 and the first electrical contact surface 33 in the second direction. In this case, when the process unit U1 is attached to the main body frame 11, the main body electrical contact 15 (first main body electrical contact) may be electrically connected to the second electrical contact surface 553, and the main body electrical contact 17 (second main body electrical contact) may be electrically connected to the first electrical contact surface 33.

[0157] Although the present disclosure has been described in detail, the above description is merely illustrative in all respects and does not limit the present disclosure. It is understood that countless variations not illustrated can be envisioned without departing from the scope of this disclosure. The configurations described in the above embodiments and variations can be combined or omitted as appropriate as long as they are not mutually inconsistent. [Explanation of symbols]

[0158] 100 Image forming device 10. Device body 11 Main frame 15 Main body electrical contact (first main body electrical contact) 20 Developer cartridge 21 Casing 211 Protrusion (1st protrusion) 213 First Handle 22 Developing roller 245 1st agitator gear 247 Large diameter gear 249 Small Diameter Gear 28 Gear Cover 31 Development memory 33 First electrical contact surface 34 First Holder 35 First holder cover 353 Screw 354 Through hole (first through hole) 355 Through hole (second through hole) 411 First Boss 412 Second Boss 413 1st outer surface 414 Holder groove (first holder groove) 415 Holder protrusion 433,434 Convex part 435 Second outer surface 436,437 Curved surface (1st curved surface, 2nd curved surface) 438 Holder groove (second holder groove) 45 Elastic member A22 Developing roller shaft A24 Agitator shaft

Claims

1. A developer cartridge, a casing capable of containing a developer; a developing roller rotatable about a developing roller axis extending in a first direction, the developing roller being positioned at one end of the casing in a second direction intersecting the first direction; a coupling rotatable about a coupling shaft extending in a first direction, the coupling being located at one end of the casing in the first direction, the coupling having a coupling gear; a first idle gear rotatable about a first idle shaft extending in the first direction, the first idle gear being located at one end of the casing in the first direction, and meshing with the coupling gear; a second idle gear rotatable about a second idle shaft extending in the first direction and positioned at one end of the casing in the first direction; an agitator rotatable about an agitator shaft extending in the first direction; an agitator gear located at one end of the casing in the first direction and rotatable about the agitator shaft together with the agitator, the agitator gear meshing with the second idle gear; a first protrusion extending in the first direction from the one end of the casing in the first direction, the first protrusion being movable together with the casing in the first direction; a development memory having a first electrical contact surface; a first holder located at one end of the casing in the first direction, the first holder holding the first electrical contact surface, the first holder located farther from the first protrusion than the agitator gear in the first direction, At least a portion of the first holder is located in a projected area of ​​the agitator gear in the first direction, A developing cartridge characterized in that the first holder has a first outer surface located at one end in a third direction intersecting the first electrical contact surface, and is capable of holding the first electrical contact surface.

2. A developing cartridge, a casing capable of containing a developer; a developing roller rotatable about a developing roller axis extending in a first direction, the developing roller being positioned at one end of the casing in a second direction intersecting the first direction; a coupling rotatable about a coupling shaft extending in a first direction, the coupling being located at one end of the casing in the first direction, the coupling having a coupling gear; a first idle gear rotatable about a first idle shaft extending in the first direction, the first idle gear being located at one end of the casing in the first direction, and meshing with the coupling gear; a second idle gear rotatable about a second idle shaft extending in the first direction and positioned at one end of the casing in the first direction; an agitator rotatable about an agitator shaft extending in the first direction; an agitator gear located at one end of the casing in the first direction and rotatable about the agitator shaft together with the agitator, the agitator gear meshing with the second idle gear; a first protrusion extending in the first direction from the one end of the casing in the first direction, the first protrusion being movable together with the casing in the first direction; a development memory having a first electrical contact surface; a first holder located at one end of the casing in the first direction, the first holder holding the first electrical contact surface, the first holder located farther from the first protrusion than the agitator gear in the first direction, At least a portion of the first holder is located in a projected area of ​​the agitator gear in the first direction, the agitator gear includes a large diameter gear and a small diameter gear having a diameter smaller than that of the large diameter gear and positioned between the large diameter gear and the casing in the first direction; a developing cartridge, wherein the first protrusion is located between the large diameter gear and the casing in the first direction and is farther from the agitator shaft than the small diameter gear is.

3. 3. The developing cartridge according to claim 1, The developing cartridge is characterized in that the first protrusion is configured to receive a pressing force from the other end of the casing in the second direction toward the one end of the casing in the second direction.

4. 4. The developing cartridge according to claim 1, a gear cover that covers at least a portion of the agitator gear and is fixed to the one end of the casing in the first direction; Furthermore, The developing cartridge, wherein the first holder is positioned farther from the agitator gear than the gear cover is in the first direction.

5. 5. The developing cartridge according to claim 4, The developing cartridge, wherein the first holder is movable relative to the gear cover.

6. 6. The developing cartridge according to claim 5, a first holder cover that holds the first holder and is fixed to an outer surface of the gear cover in the first direction; The developing cartridge, wherein the first holder is movable relative to the gear cover and the first holder cover.

7. 7. The developing cartridge according to claim 6, the first holder cover has a first recess or a first through hole, the first holder has a first boss extending in the first direction, the first boss being inserted into the first recess or the first through hole; A developing cartridge characterized in that when the first holder moves relative to the first holder cover in a third direction that intersects with the first electrical contact surface, the first boss moves in the third direction within the first recess or the first through hole.

8. 8. The developing cartridge according to claim 7, a size of the first recess or the first through hole in the third direction is larger than a size of the first boss in the third direction;

9. 9. The developing cartridge according to claim 6, wherein: The developing cartridge, wherein the first holder cover is fixed to the gear cover by a screw inserted from an inner surface of the gear cover.

10. 10. The developing cartridge according to claim 1, The developing cartridge, wherein the first holder is movable in the first direction relative to the casing.

11. 11. The developing cartridge according to claim 1, The developing cartridge, wherein the first holder is movable in the second direction relative to the casing.

12. 12. The developing cartridge according to claim 1, The developing cartridge, wherein the second direction is perpendicular to the first direction.

13. 2. The developing cartridge according to claim 1, The developing cartridge, wherein the first holder has a first holder groove located at the one end in the third direction.

14. 14. The developing cartridge according to claim 13, a developing cartridge, wherein the first holder groove is located between the first protrusion and the first outer surface in the first direction;

15. 15. The developing cartridge according to claim 13 or 14, the first holder has a holder protrusion positioned apart from the first outer surface in the first direction; The developing cartridge, wherein the first holder groove is located between the first outer surface and the holder protrusion in the first direction.

16. 16. The developing cartridge according to claim 13, The developing cartridge, wherein the first holder is movable in the third direction relative to the casing.

17. 17. The developing cartridge according to claim 13, The developing cartridge, wherein the third direction intersects with the first direction and the second direction.

18. 18. The developing cartridge according to claim 13, The developing cartridge, wherein the third direction is perpendicular to the first direction and the second direction.

19. 16. The developing cartridge according to claim 1, wherein: The first holder includes: a second outer surface located at the other end in the third direction; an elastic member located between the first outer surface and the second outer surface, the elastic member being stretchable in the third direction between a first state and a second state; The developing cartridge further comprises:

20. 20. The developing cartridge according to claim 19, The developing cartridge, wherein the elastic member is a spring.

21. 21. The developing cartridge according to claim 19 or 20, The second outer surface of the developing cartridge has a first convex curved surface.

22. 22. The developing cartridge according to claim 21, The second outer surface is a convex second curved surface that is spaced apart from the first curved surface in the first direction.

23. 23. The developer cartridge according to claim 22, a second holder groove located between the first curved surface and the second curved surface in the first direction;

24. 24. The developing cartridge according to claim 1, a first handle located at the other end of the casing in the second direction; Furthermore, The developing cartridge, wherein the first holder is located between the developing roller and the first handle in the second direction.

25. 9. The developing cartridge according to claim 7, A developing cartridge, characterized in that the first holder is located between a first outer surface located at one end of the casing in the third direction and a second outer surface located at the other end of the casing in the third direction.

26. 16. The developing cartridge according to claim 1, wherein: The first holder holds the developing memory on the first outer surface.

27. 7. The developing cartridge according to claim 6, the first holder cover has a second recess or a second through hole; the first holder has a second boss having a length in the first direction, the second boss being inserted into the second recess or the second through hole; A developing cartridge characterized in that when the first holder moves relative to the first holder cover in a third direction that intersects with the first electrical contact surface, the second boss moves in the third direction within the second recess or the second through hole.

28. 28. The developer cartridge according to claim 27, a size of the second recess or the second through hole in the third direction is larger than a size of the second boss in the third direction;

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