Developing cartridge

Abstract

To prevent an electrical contact surface from becoming dirty with toner.SOLUTION: A developing cartridge 30 comprises: a housing 31 that can store toner; a developing roller 32 that is rotatable about a developing axis X1 extending in a first direction, the developing roller 32 located at one end of the housing 31 in a second direction intersecting with the first direction; a developing electrode 37 that is electrically connected with the developing roller 32, the developing electrode 37 located at one end of the housing 31 in the first direction; a supply roller that supplies toner to the developing roller 32; a supply electrode 38 that is electrically connected with the supply roller, the supply electrode 38 located at one end of the housing 31 in the first direction; and an IC chip C1 that has an electrical contact surface C11 located at one end of the housing 31 in the first direction. The electrical contact surface C11 is located on the opposite side of the developing electrode 37 with respect to a part of the supply electrode 38 (supply electrode surface 38A) in the second direction.SELECTED DRAWING: Figure 5

Description

[Technical field]

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

[0002] Conventionally, a known developer cartridge includes a housing, a developer roller, a supply roller, a developer electrode, a supply electrode, and an IC chip (see Patent Document 1). The developer roller is rotatable about a developer axis extending in a first direction. The developer roller is located at one end of the housing in a second direction intersecting the first direction. The supply roller is rotatable about a supply axis extending in the first direction. The supply roller is a roller that supplies toner to the developer roller. The developer electrode is a member for supplying electricity to the developer roller. The supply electrode is a member for supplying electricity to the supply roller. The IC chip has an electrical contact surface.

[0003] In this technology, the electrical contact surface is located at one end of the housing in a first direction. The development electrode and the supply electrode are located at the other end of the housing in the first direction. In addition, in the second direction, the electrical contact surface is located at approximately the same position as the development electrode. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2018-066973 A Summary of the Invention [Problem to be solved by the invention]

[0005] However, in the conventional technology, the electrical contact surface is located at approximately the same position as the development electrode in the second direction, so that the electrical contact surface is located close to the development roller, and there is a risk that the electrical contact surface will become contaminated by toner scattered from the development roller.

[0006] Therefore, an object of the present disclosure is to prevent electrical contact surfaces from becoming soiled with toner. [Means for solving the problem]

[0007] In order to solve the above problem, the developing cartridge of the present disclosure comprises a housing capable of containing toner, a developing roller rotatable about a developing axis extending in a first direction, the developing roller located at one end of the housing in a second direction intersecting the first direction, a developing electrode electrically connected to the developing roller, the developing electrode located at one end of the housing in the first direction, a supply roller rotatable about a supply axis extending in the first direction, the supply roller supplying toner to the developing roller, a supply electrode electrically connected to the supply roller, the supply electrode located at the one end of the housing in the first direction, and an IC chip having an electrical contact surface located at the one end of the housing in the first direction. The electrical contact surface is located on an opposite side of the development electrode relative to a portion of the supply electrode in the second direction.

[0008] According to this configuration, the electrical contact surface is located on the opposite side of the developing electrode relative to a portion of the supply electrode in the second direction, so that the electrical contact surface can be kept away from the developing roller, thereby preventing the electrical contact surface from becoming contaminated with toner.

[0009] The second direction may be perpendicular to the first direction.

[0010] The developing cartridge may further include a handle located at the other end of the housing in the second direction.

[0011] Moreover, the supply roller may be located between the developing roller and the handle in the second direction.

[0012] The developing electrode may be made of a conductive resin.

[0013] The supply electrode may be made of a conductive resin.

[0014] In addition, the developing roller has a developing roller shaft extending in the first direction, and the developing electrode has a developing bearing having a developing hole into which the developing roller shaft is inserted, and a developing electrode surface electrically connected to the developing bearing, and the developing electrode surface may be located at the one end of the housing in the first direction.

[0015] The developing electrode surface may be a surface perpendicular to the first direction.

[0016] In addition, the supply roller may have a supply roller shaft extending in the first direction, and the supply electrode may have a supply bearing having a supply hole into which the supply roller shaft is inserted, and a supply electrode surface electrically connected to the supply bearing, and the supply electrode surface may be located at the one end of the housing in the first direction.

[0017] The supply electrode surface may be a surface perpendicular to the first direction.

[0018] The electrical contact surface may be located on an opposite side of the development electrode surface relative to the supply electrode surface in the second direction.

[0019] The developing cartridge may further include an insulating member located between the developing electrode and the supply electrode.

[0020] The developing cartridge may further include a coupling for transmitting a driving force to the developing roller and the supply roller, the coupling being located at the other end of the housing in the first direction.

[0021] According to this configuration, the developing electrode, the supply electrode and the electrical contact surface are located at one end of the housing in the first direction, and the coupling is located at the other end of the housing in the first direction, so that vibrations of the coupling are not easily transmitted to the developing electrode, the supply electrode and the electrical contact surface.

[0022] The electrical contact surface may be located on an opposite side of the development electrode surface with respect to the supply electrode surface in a third direction intersecting the first direction and the second direction.

[0023] The third direction may be perpendicular to the first direction and the second direction.

[0024] The electrical contact surface may also be movable relative to the housing.

[0025] In addition, the developing cartridge may be detachably attached to a drum frame of a drum cartridge, and the drum cartridge may include a photosensitive drum rotatable about a drum axis extending in the first direction, and a locking lever for locking the developing cartridge to the drum frame, and when the developing cartridge is attached to the drum frame, the electrical contact surface may be located on the opposite side of the locking lever relative to the housing in the first direction.

[0026] According to this configuration, when the user operates the lock lever, the user's fingers can be prevented from touching the electrical contact surfaces, thereby preventing the electrical contact surfaces from becoming dirty.

[0027] In addition, the drum cartridge may further include a pressing member for pressing the developing roller against the photosensitive drum, and when the developing cartridge is attached to the drum frame, the electrical contact surface may be located on the opposite side of the lock lever from the pressing member in the first direction.

[0028] The housing may also have a first outer surface and a second outer surface positioned away from the first outer surface in the first direction, and the development electrode and the supply electrode may be located on the first outer surface.

[0029] In addition, a distance between the first outer surface of the housing and the electrical contact surface in the first direction may be longer than a distance between the first outer surface of the housing and the development electrode in the first direction.

[0030] Furthermore, a distance between the first outer surface of the housing and the electrical contact surface in the first direction may be longer than a distance between the first outer surface of the housing and the supply electrode in the first direction.

[0031] In addition, the development electrode may have a development protrusion extending in the first direction and located at one end of the housing in the first direction, the supply electrode may have a supply protrusion extending in the first direction and located at one end of the housing in the first direction, and the electrical contact surface may be located on the opposite side of the development protrusion in the second direction relative to the supply protrusion.

[0032] In addition, the development projection may have a development electrode surface, the supply projection may have a supply electrode surface, and the electrical contact surface may be located on the opposite side of the development electrode surface to the supply electrode surface in the second direction. Effect of the Invention

[0033] According to the present disclosure, it is possible to suppress contamination of the electrical contact surface with toner. [Brief description of the drawings]

[0034] [Figure 1] FIG. 2 illustrates a configuration of a process cartridge. [Diagram 2] 4 is a perspective view illustrating a structure of one end portion of the developing cartridge in a first direction. FIG. [Diagram 3] FIG. 2 is an exploded perspective view showing a developing electrode, a supply electrode, and an insulating member. [Figure 4] FIG. 2 is an exploded perspective view of the tip holder. [Diagram 5]1 is a side view showing the process cartridge with a side wall at one end side in a first direction of the drum frame removed, and is a side view showing the state before the process cartridge is mounted in the main body housing. FIG. [Figure 6] FIG. 2 is a side view showing the process cartridge with a side wall at one end side in a first direction of the drum frame removed, and is a side view showing a state in which the process cartridge is attached to a main body casing. [Figure 7] 13 is a perspective view illustrating the structure of the other end of the developing cartridge in the first direction. FIG. [Figure 8] 13 is a perspective view illustrating the structure of the other end portion of the process cartridge in the first direction. FIG. [Figure 9] 4 is a perspective view illustrating a structure of one end portion of the process cartridge in a first direction. FIG. [Figure 10] This is a side view showing the process cartridge with the side wall on the other end side in the first direction of the drum frame removed, in which (a) shows the lock lever in the locked position and (b) shows the lock lever in the released position. [Figure 11] FIG. 2 is a plan view showing the process cartridge. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0035] Next, an embodiment of the present disclosure will be described in detail with reference to the drawings as appropriate. As shown in Fig. 1, the image forming apparatus 1 includes a main body housing 10 and a process cartridge 20. For convenience, the main body housing 10 is illustrated in a small size in Fig. 1.

[0036] The process cartridge 20 is detachably attached to the main body housing 10. The process cartridge 20 includes a developing cartridge 30 and a drum cartridge 40. The developing cartridge 30 is detachably attached to a drum frame 41 of the drum cartridge 40, which will be described later.

[0037] The developing cartridge 30 includes a housing 31, a developing roller 32, a supply roller 33, a layer thickness regulating blade 34, an agitator 35, and a handle HD. The housing 31 is capable of containing toner. The housing 31 has a first outer surface F1 (described later) and a second outer surface F2 (described later) that is located away from the first outer surface F1 in the first direction (see FIG. 2).

[0038] The developing roller 32 is a roller that supplies toner to a photosensitive drum 42 described later. The developing roller 32 is rotatable about a developing axis X1 that extends in a first direction. The developing roller 32 is located at one end of the housing 31 in a second direction that intersects with the first direction. Preferably, the second direction is perpendicular to the first direction. In this embodiment, the second direction is perpendicular to the first direction. Also, in this embodiment, the second direction is a direction along an electrical contact surface C11 described later.

[0039] In this embodiment, a direction perpendicular to the first direction and the second direction is defined as a third direction. In this embodiment, the third direction is defined as a direction perpendicular to an electrical contact surface C11 described later. The third direction may be any direction that intersects with the first direction and the second direction.

[0040] The developing roller 32 has a cylindrical developing roller shaft 32A and a cylindrical roller portion 32B. The developing roller shaft 32A is made of, for example, metal. The developing roller shaft 32A extends in a first direction. The roller portion 32B is made of, for example, rubber. The roller portion 32B covers a portion of the developing roller shaft 32A.

[0041] The handle HD is a portion that can be gripped by a user. The handle HD is U-shaped (see FIG. 2). The handle HD is located at the other end of the housing 31 in the second direction.

[0042] The supply roller 33 is a roller that supplies toner to the developing roller 32. The supply roller 33 is rotatable about a supply axis X2 that extends in the first direction. The supply roller 33 is located between the developing roller 32 and the handle HD in the second direction. In more detail, the supply axis X2 is located between the developing axis X1 and the handle HD in the second direction.

[0043] The supply roller 33 has a cylindrical supply roller shaft 33A and a cylindrical roller portion 33B. The supply roller shaft 33A is made of, for example, metal. The supply roller shaft 33A extends in a first direction. The roller portion 33B is made of, for example, rubber. The roller portion 33B covers a part of the supply roller shaft 33A. The roller portion 33B contacts the roller portion 32B of the developing roller 32.

[0044] The layer thickness regulating blade 34 is a member for regulating the thickness of the toner layer on the developing roller 32. The layer thickness regulating blade 34 comes into contact with the roller portion 32B of the developing roller 32.

[0045] The agitator 35 agitates the toner in the housing 31. The agitator 35 also supplies the toner to the supply roller 33. The agitator 35 is rotatable about an agitator axis X3 that extends in the first direction.

[0046] The drum cartridge 40 includes a drum frame 41, a photosensitive drum 42, a charger 43, a transfer roller 44, a cleaning roller 45, a transport roller 46, and a lock lever L. The photosensitive drum 42 is rotatable about a drum axis X4 extending in the first direction.

[0047] The charger 43 is a member that charges the photosensitive drum 42. The charger 43 is a scorotron type charger that is spaced apart from the photosensitive drum 42.

[0048] The transfer roller 44 is a roller for transferring the toner on the photosensitive drum 42 to a sheet (not shown). The transfer roller 44 is rotatable about a transfer axis X5 extending in the first direction. The transfer roller 44 contacts the photosensitive drum 42. The photosensitive drum 42 is located between the charger 43 and the transfer roller 44 in the third direction.

[0049] The cleaning roller 45 is a roller for cleaning the toner on the photosensitive drum 42. The cleaning roller 45 is rotatable about a cleaning axis X6 extending in the first direction. The cleaning roller 45 comes into contact with the photosensitive drum 42.

[0050] The conveying roller 46 is a roller that conveys the sheet toward the photosensitive drum 42. The conveying roller 46 is rotatable about a conveying axis X7 that extends in the first direction.

[0051] 2, the developer cartridge 30 further includes an IC chip C1, a developer electrode 37, a supply electrode 38, an insulating member 39, and a tip holder 50. The IC chip C1, the developer electrode 37, the supply electrode 38, and the tip holder 50 are located at one end 31A of the housing 31 in the first direction. In other words, the IC chip C1, the developer electrode 37, the supply electrode 38, and the tip holder 50 are located on a first outer surface F1 of the housing 31.

[0052] The IC chip C1 stores development information related to the development cartridge 30. Examples of the development information include the remaining amount of toner in the development cartridge 30 and the life of the development roller 32. The IC chip C1 has an electrical contact surface C11 and a substrate C12 equipped with a memory in which the development information is stored. The electrical contact surface C11 is electrically connected to the memory. The electrical contact surface C11 is located at one end 31A of the housing 31 in the first direction. When the process cartridge 20 is attached to the main housing 10, the electrical contact surface C11 comes into contact with a main body contact 13 (see FIG. 6) described later.

[0053] The developing electrode 37 is a member electrically connected to the developing roller 32. The developing electrode 37 is made of a conductive resin. The developing electrode 37 has a developing protrusion 37D having a developing electrode surface 37A and a developing bearing 37B. The developing protrusion 37D extends in a first direction. The developing electrode surface 37A is located at the tip of the developing protrusion 37D in the first direction. The developing electrode surface 37A is a surface that contacts a developing main body electrode (not shown) of the main body housing 10. The developing electrode surface 37A is perpendicular to the first direction. The developing electrode surface 37A is electrically connected to the developing bearing 37B. The developing protrusion 37D is located at one end 31A of the housing 31 in the first direction. In other words, the developing protrusion 37D is located at the first outer surface F1 of the housing 31. The developing electrode surface 37A is located at one end 31A of the housing 31 in the first direction. In other words, the developing electrode surface 37A is located at the first outer surface F1 of the housing 31. The developing bearing 37B has a developing hole 37C (see FIG. 3) into which the developing roller shaft 32A is inserted.

[0054] The supply electrode 38 is a member electrically connected to the supply roller 33 (see FIG. 1). The supply electrode 38 is made of a conductive resin. As shown in FIG. 3, the supply electrode 38 has a supply protrusion 38D having a supply electrode surface 38A and a supply bearing 38B. The supply protrusion 38D extends in a first direction. The supply electrode surface 38A is located at the tip of the supply protrusion 38D in the first direction. The supply electrode surface 38A is a surface that contacts a supply main electrode (not shown) of the main body housing 10. The supply electrode surface 38A is perpendicular to the first direction. The supply electrode surface 38A is electrically connected to the supply bearing 38B. The supply protrusion 38D is located at one end 31A of the housing 31 in the first direction. In other words, the supply protrusion 38D is located on the first outer surface F1 of the housing 31. The supply electrode surface 38A is located at one end 31A of the housing 31 in the first direction. In other words, supply electrode surface 38A is located on first outer surface F1 of housing 31. Supply bearing 38B has supply hole 38C into which supply roller shaft 33A (see FIG. 1) is inserted.

[0055] The insulating member 39 is made of insulating resin or the like. The insulating member 39 is located between the developing electrode 37 and the supply electrode 38. More specifically, the insulating member 39 has a plate-shaped portion 39A, a first wall 39B, and a second wall 39C. The plate-shaped portion 39A is located between the developing electrode 37 and the supply electrode 38 in the first direction. The first wall 39B and the second wall 39C extend from the plate-shaped portion 39A toward the opposite side to the housing 31. As shown in FIG. 5, the first wall 39B is located on the development axis X1 side of the supply electrode surface 38A in the second direction. The second wall 39C is located on the development axis X1 side of the supply electrode surface 38A in the third direction. A part of the first wall 39B and a part of the second wall 39C are located between the developing electrode surface 37A and the supply electrode surface 38A in a direction perpendicular to the first direction.

[0056] The electrical contact surface C11 is located on the opposite side of the development electrode surface 37A with respect to the supply electrode surface 38A in the second direction. In other words, the electrical contact surface C11 is located on the opposite side of the development electrode 37 with respect to the supply electrode surface 38A, which is a part of the supply electrode 38, in the second direction. In further other words, the electrical contact surface C11 is located on the opposite side of the development protrusion 37D with respect to the supply protrusion 38D in the second direction. Also, the electrical contact surface C11 is located on the opposite side of the developing electrode surface 37A with respect to the supply electrode surface 38A in the third direction. In other words, the electrical contact surface C11 is located on the opposite side of the developing electrode 37 with respect to the supply electrode surface 38A, which is a part of the supply electrode 38, in the third direction. In further other words, the electrical contact surface C11 is located on the opposite side of the developing protrusion 37D with respect to the supply protrusion 38D in the third direction. The electrical contact surface C11 is perpendicular to the third direction.

[0057] 11, the distance in the first direction between the first outer surface F1 of the housing 31 and the electrical contact surface C11 is longer than the distance in the first direction between the first outer surface F1 of the housing 31 and the development electrode 37. In other words, the distance in the first direction between the first outer surface F1 of the housing 31 and the electrical contact surface C11 is longer than the distance in the first direction between the first outer surface F1 of the housing 31 and the development electrode surface 37A. The distance between the first outer surface F1 of the housing 31 and the electrical contact surface C11 in the first direction is longer than the distance between the first outer surface F1 of the housing 31 and the supply electrode 38 in the first direction. In other words, the distance between the first outer surface F1 of the housing 31 and the electrical contact surface C11 in the first direction is longer than the distance between the first outer surface F1 of the housing 31 and the supply electrode surface 38A in the first direction. The distance between the first outer surface F1 of the housing 31 and the electrical contact surface C11 in the first direction is longer than the distance between the first outer surface F1 of the housing 31 and the insulating member 39 in the first direction.

[0058] The chip holder 50 is a holder that holds the IC chip C1 so that the electrical contact surface C11 is movable relative to the housing 31. As shown in Fig. 4, the chip holder 50 includes a holder 51, a reciprocating member 52, a spring 53, a first cover 54, and a second cover 55. The holder 51 is a member that holds the IC chip C1. The holder 51 also holds the reciprocating member 52 so that it is movable in a third direction.

[0059] The holder 51 has a base portion 51A, a cylindrical portion 51B, a first boss B1, a second boss B2, and a third boss B3. The base portion 51A is a portion that holds the IC chip C1. The base portion 51A protrudes from the cylindrical portion 51B in a first direction toward the second cover 55.

[0060] The cylindrical portion 51B has a rectangular cylindrical shape. The cylindrical portion 51B extends from the base portion 51A in a direction opposite to the IC chip C1. The first boss B1 and the second boss B2 protrude in a first direction from the cylindrical portion 51B toward the first cover 54. The third boss B3 protrudes in the first direction from the cylindrical portion 51B toward the second cover 55.

[0061] The spring 53 is located between the holder 51 and the advancing / retreating member 52. The spring 53 is a coil spring. The spring 53 biases the advancing / retreating member 52 in a direction away from the IC chip C1.

[0062] The first cover 54 is located on the first outer surface 31A of the housing 31. The first cover 54 has a first long hole H1 and a second long hole H2. The first boss B1 fits into the first long hole H1. The second boss B2 fits into the second long hole H2.

[0063] The second cover 55 is attached to the first cover 54. With the second cover 55 attached to the first cover 54, the cylindrical portion 51B of the holder 51 is located between the first cover 54 and the second cover 55 in the first direction. The second cover 55 has a third elongated hole H3. The third boss B3 enters the third elongated hole H3. The second cover 55 also has a holding surface 55A capable of holding the base portion 51A.

[0064] The first long hole H1, the second long hole H2, and the third long hole H3 are long holes that are long in the third direction. The first long hole H1 has one end H11 and the other end H12 that is separated from the one end H11 in the third direction. The length of the one end H11 in the second direction is shorter than the length of the other end H12 in the second direction. When the process cartridge 20 is attached to the main body housing 10, the one end H11 is located below the other end H12. The one end H11 restricts the movement of the first boss B1 in the second direction. The other end H12 allows the movement of the first boss B1 in the second direction.

[0065] The second long hole H2 has one end H21 and the other end H22 spaced apart from the one end H21 in the third direction. The length of the one end H21 in the second direction is smaller than the length of the other end H22 in the second direction. When the process cartridge 20 is attached to the main body housing 10, the one end H21 is located below the other end H22. The one end H21 restricts the movement of the second boss B2 in the second direction. The other end H22 allows the movement of the second boss B2 in the second direction.

[0066] The third long hole H3 has one end H31 and the other end H32 spaced apart from the one end H31 in the third direction. The length of the one end H31 in the second direction is smaller than the length of the other end H32 in the second direction. When the process cartridge 20 is attached to the main body housing 10, the one end H31 is located below the other end H32. The one end H31 restricts the movement of the third boss B3 in the second direction. The other end H32 allows the movement of the third boss B3 in the second direction.

[0067] By configuring the chip holder 50 as described above, the electrical contact surface C11 is movable between a first position shown in Fig. 5 and a second position shown in Fig. 6. As shown in Fig. 5, the electrical contact surface C11 is located at the first position before the process cartridge 20 is mounted in the main body housing 10. When the electrical contact surface C11 is located at the first position, the holder 51 is held by the first cover 54 and the second cover 55.

[0068] Specifically, when the electrical contact surface C11 is in the first position, the seat portion 51A of the holder 51 contacts the holding surface 55A of the second cover 55. When the electrical contact surface C11 is in the first position, the third boss B3 contacts one end H31 of the third long hole H3. Although not shown, when the electrical contact surface C11 is in the first position, the first boss B1 contacts one end H11 of the first long hole H1. When the electrical contact surface C11 is in the first position, the second boss B2 contacts one end H21 of the second long hole H2.

[0069] As shown in FIG. 6, the electrical contact surface C11 located at the second position is located at a position farther from the development axis X1 in the third direction than the electrical contact surface C11 located at the first position. The electrical contact surface C11 located at the second position is located at a position closer to the development axis X1 in the second direction than the electrical contact surface C11 located at the first position. The electrical contact surface C11 is located at the second position when the process cartridge 20 is attached to the main body housing 10. The main body housing 10 has a first guide 11, a second guide 12, and a main body contact 13. The first guide 11 is a guide that contacts the lower end of the advancing and retracting member 52 to guide the advancing and retracting member 52. The second guide 12 is a guide that contacts the upper end of the holder 51 to guide the holder 51. The main body contact 13 is a contact that contacts the electrical contact surface C11 of the IC chip C1. The main body contact 13 electrically connects a control unit (not shown) and the IC chip C1. In the figure, for the sake of convenience, the IC chip C1 and the body contacts 13 are shown separated from each other.

[0070] When the electrical contact surface C11 is located at the second position, the holder 51 is held by the first guide 11 of the main body housing 10 via the advance / retract member 52 and the spring 53. When the electrical contact surface C11 is located at the second position, the base portion 51A of the holder 51 is separated upward from the holding surface 55A of the second cover 55. When the electrical contact surface C11 is located at the second position, the third boss B3 is separated from the inner surface of the third long hole H3. Although not shown, when the electrical contact surface C11 is located at the second position, the first boss B1 is separated from the inner surface of the first long hole H1. When the electrical contact surface C11 is located at the second position, the second boss B2 is separated from the inner surface of the second long hole H2. When the electrical contact surface C11 is located at the second position, the IC chip C1 is urged against the main body contact 13 by the urging force of the spring 53. When the electrical contact surface C11 is in the second position, the electrical contact surface C11 contacts the body contact 13.

[0071] The third direction is parallel to the up-down direction when the process cartridge 20 is attached to the main body housing 10. When the process cartridge 20 is attached to the main body housing 10, the electrical contact surface C11 is located above the development axis X1.

[0072] 7, the developing cartridge 30 further includes a coupling 36. The coupling 36 is located at the other end 31B in the first direction of the housing 31. In other words, the coupling 36 is located on the second outer surface F2 of the housing 31.

[0073] The coupling 36 is a member for transmitting a driving force to the developing roller 32, the supply roller 33, and the agitator 35. The coupling 36 is rotatable about a coupling axis X8 extending in the first direction. The coupling 36 receives a driving force from a driving source (not shown) of the main body housing 10. The driving force transmitted from the driving source to the coupling 36 is transmitted to the developing roller 32, the supply roller 33, and the agitator 35 via gears (not shown).

[0074] 8, the lock lever L is a member for locking the developing cartridge 30 to the drum frame 41. The drum frame 41 has one end 41A in the first direction and the other end 41B in the first direction. The lock lever L is located at the other end 41B in the first direction of the drum frame 41. When the developing cartridge 30 is attached to the drum frame 41, the electrical contact surface C11 is located on the opposite side of the lock lever L with respect to the housing 31 in the first direction.

[0075] As shown in FIG. 9, the developing cartridge 30 further has a gear cover GC. The gear cover GC is a cover that covers a gear for driving the developing roller 32 and the like. The gear cover GC is located at the other end 31B in the first direction of the housing 31. The lock lever L contacts the gear cover GC. As shown in FIGS. 10(a) and 10(b), the drum frame 41 has a bottom wall 41C. The bottom wall 41C is located below the developing cartridge 30 when the process cartridge 20 is attached to the main body housing 10. The lock lever L is capable of pushing up a part of the developing cartridge 30 in a direction away from the bottom wall 41C of the drum frame 41.

[0076] The lock lever L is rotatable about a lock axis X9 extending in the first direction. The lock lever L is rotatable between a locked position shown in Fig. 10(a) and an unlocked position shown in Fig. 10(b). The locked position is a position where the lock lever L locks the developer cartridge 30 to the drum frame 41. The unlocked position is a position where the lock of the developer cartridge 30 to the drum frame 41 is released.

[0077] The lock lever L has an operating portion L1 that is operated by the user, and a pressing portion L2 that can push up the developing cartridge 30. The operating portion L1 has a tip L11 that is the end furthest from the lock axis X9. The pressing portion L2 has a tip L21 that is the end furthest from the lock axis X9.

[0078] The bottom wall 41C has a hole 41D. When the lock lever L is in the locked position, the pressing portion L2 of the lock lever L enters the hole 41D. When the lock lever L is in the locked position, the pressing portion L2 of the lock lever L is exposed to the outside of the drum frame 41. When the lock lever L is in the released position, the pressing portion L2 of the lock lever L leaves the hole 41D.

[0079] When the lock lever L is in the locked position, the tip L21 of the pressing portion L2 is located between the developer cartridge 30 and the bottom wall 41C. When the process cartridge 20 is attached to the main body housing 10, the tip L21 of the pressing portion L2 is located below the lock axis X9. When the process cartridge 20 is attached to the main body housing 10, the tip L11 of the operating portion L1 is located above the lock axis X9.

[0080] When the lock lever L is in the released position, the tip L21 of the pressing portion L2 is located farther from the bottom wall 41C than the tip L21 of the pressing portion L2 when the lock lever L is in the locked position. When the lock lever L is in the released position, the tip L21 of the pressing portion L2 is located farther from the bottom wall 41C than the lock axis X9.

[0081] As shown in FIG. 8 and FIG. 9, the drum frame 41 has a first recess 41E1 and a second recess 41E2. When the developing cartridge 30 is mounted in the drum frame 41, one end of the developing roller shaft 32A of the developing roller 32 in the first direction enters the first recess 41E1. When the developing cartridge 30 is mounted in the drum frame 41, the other end of the developing roller shaft 32A of the developing roller 32 in the first direction enters the second recess 41E2. The first recess 41E1 is located at one end 41A of the drum frame 41. The second recess 41E2 is located at the other end 41B of the drum frame 41. The first recess 41E1 and the second recess 41E2 restrict the movement of the developing roller shaft 32A in the third direction. As a result, as shown in FIG. 10(a) and (b), the developing cartridge 30 is rotatable in the third direction about the developing axis X1.

[0082] When the lock lever L is in the locked position, the developer cartridge 30 is in a contact position where it contacts the bottom wall 41C, and when the lock lever L is in the released position, the developer cartridge 30 is in a separated position away from the bottom wall 41C.

[0083] 11, the drum cartridge 40 further includes a pressing member P for pressing the developing roller 32 against the photosensitive drum 42. The pressing member P has a first pressing member P1 and a second pressing member P2. The first pressing member P1 is located at one end 41A of the drum frame 41 in the first direction. The second pressing member P2 is located at the other end 41B of the drum frame 41 in the first direction.

[0084] When the developer cartridge 30 is attached to the drum frame 41, the electrical contact surface C11 is located on the opposite side of the lock lever L with respect to the first pressing member P1 and the second pressing member P2 in the first direction. The developer cartridge 30 has a first pressed portion 31C and a second pressed portion 31D. The first pressing member P1 contacts the first pressed portion 31C. The second pressing member P2 contacts the second pressed portion 31D.

[0085] As described above, the following effects can be obtained in this embodiment. As shown in FIG. 5, since the electrical contact surface C11 is located on the opposite side of the development electrode 37 in the second direction relative to the supply electrode surface 38A, which is part of the supply electrode 38, the electrical contact surface C11 can be kept away from the development roller 32, and the electrical contact surface C11 can be prevented from becoming contaminated with toner.

[0086] As shown in Figures 8 and 9, the development electrode 37, the supply electrode 38 and the electrical contact surface C11 are located at one end 31A of the housing 31 in the first direction, and the coupling 36 is located at the other end 31B of the housing 31 in the first direction, so that vibrations of the coupling 36 are not easily transmitted to the development electrode 37, the supply electrode 38 and the electrical contact surface C11.

[0087] When the developing cartridge 30 is attached to the drum frame 41, the electrical contact surface C11 is located on the opposite side of the lock lever L with respect to the housing 31 in the first direction. Therefore, when the user operates the lock lever L, the user's finger can be prevented from touching the electrical contact surface C11, and therefore, the electrical contact surface C11 can be prevented from becoming dirty.

[0088] The present disclosure is not limited to the above-described embodiment, but can be used in various forms as exemplified below. In the above embodiment, one substrate C12 is configured to have the electrical contact surface C11 and the memory integrated therein, but the electrical contact surface and the memory may be configured separately. In this case, the electrical contact surface may be electrically connected to the memory via a harness.

[0089] The elements described in the above-mentioned embodiment and modified examples may be implemented in any combination. [Explanation of symbols]

[0090] 30 Developing cartridge 31 Case 31A One end 32 Developing roller 33 Supply roller 37 Development electrode 38 Supply electrode 38A supply electrode surface C1 IC chip C11 Electrical contact surface X1 Development shaft X2 supply shaft

Claims

1. A housing capable of accommodating toner; a developing roller rotatable about a developing axis extending in a first direction, the developing roller being located at one end of the housing in a second direction intersecting the first direction; a developing electrode electrically connected to the developing roller and located at one end of the housing in the first direction; a supply roller rotatable about a supply axis extending in the first direction, the supply roller supplying toner to the developing roller; a supply electrode electrically connected to the supply roller and located at the one end of the housing in the first direction; an IC chip having an electrical contact surface located at the one end of the housing in the first direction; The developing cartridge, wherein the electrical contact surface is located on an opposite side of the developing electrode with respect to a portion of the supply electrode in the second direction.

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

3. 3. The developing cartridge according to claim 1, further comprising a handle located at the other end of the housing in the second direction.

4. 4. The developing cartridge according to claim 3, wherein the supply roller is located between the developing roller and the handle in the second direction.

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

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

7. the developing roller has a developing roller shaft extending in the first direction, The development electrode is a developing bearing having a developing hole into which the developing roller shaft is inserted; a developer electrode surface electrically connected to the developer bearing; 7. The developing cartridge according to claim 1, wherein the developing electrode surface is located at the one end of the casing in the first direction.

8. 8. The developing cartridge according to claim 7, wherein the developing electrode surface is a surface perpendicular to the first direction.

9. The supply roller has a supply roller shaft extending in the first direction, The supply electrode is a supply bearing having a supply hole into which the supply roller shaft is inserted; a supply electrode surface electrically connected to the supply bearing; 9. The developing cartridge according to claim 7, wherein the supply electrode surface is located at the one end of the casing in the first direction.

10. 10. The developing cartridge according to claim 9, wherein the supply electrode surface is a surface perpendicular to the first direction.

11. 11. The developing cartridge according to claim 9, wherein the electrical contact surface is located on the opposite side of the developing electrode surface with respect to the supply electrode surface in the second direction.

12. 12. The developing cartridge according to claim 9, further comprising an insulating member located between the developing electrode and the supply electrode.

13. 13. The developing cartridge according to claim 9, wherein the electrical contact surface is located on the opposite side of the developing electrode surface with respect to the supply electrode surface in a third direction intersecting the first direction and the second direction.

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

15. The developing cartridge according to claim 1 , further comprising a coupling for transmitting a driving force to the developing roller and the supply roller, the coupling being located at the other end of the housing in the first direction.

16. 16. The developing cartridge according to claim 1, wherein the electrical contact surface is movable relative to the housing.

17. the developing cartridge is detachably attached to a drum frame of a drum cartridge; The drum cartridge is a photosensitive drum rotatable about a drum axis extending in the first direction; a lock lever for locking the developing cartridge to the drum frame, A developing cartridge according to any one of claims 1 to 16, characterized in that, when the developing cartridge is attached to the drum frame, the electrical contact surface is located on the opposite side of the lock lever relative to the housing in the first direction.

18. the drum cartridge further includes a pressing member for pressing the developing roller against the photosensitive drum, 18. The developing cartridge according to claim 17, wherein, in a state in which the developing cartridge is mounted in the drum frame, the electrical contact surface is located on an opposite side of the lock lever with respect to the pressing member in the first direction.

19. The housing has a first outer surface and a second outer surface located away from the first outer surface in the first direction, 19. The developer cartridge according to claim 1, wherein the developer electrode and the supply electrode are located on the first outer surface.

20. The developing cartridge according to claim 19, wherein a distance between the first outer surface of the housing and the electrical contact surface in the first direction is longer than a distance between the first outer surface of the housing and the developing electrode in the first direction.

21. The developing cartridge according to claim 20 , wherein a distance between the first outer surface of the housing and the electrical contact surface in the first direction is longer than a distance between the first outer surface of the housing and the supply electrode in the first direction.

22. The development electrode is a developing protrusion extending in the first direction and positioned at the one end of the housing in the first direction; The supply electrode is a supply protrusion extending in the first direction and located at the one end of the housing in the first direction; The electrical contact surface is 22. The developing cartridge according to claim 1, wherein the developing protrusion is located on an opposite side to the supply protrusion in the second direction.

23. the development projection has a development electrode surface, the supply projection has a supply electrode surface; 23. A developing cartridge according to claim 22, wherein the electrical contact surface is located on the opposite side of the developing electrode surface with respect to the supply electrode surface in the second direction.

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