Drum Cartridge

Abstract

To prevent a cleaning roller from becoming difficult to rotate.SOLUTION: A drum cartridge 50 comprises: a photoreceptor drum 51; a cleaning roller 53 that is in contact with the photoreceptor drum 51, the cleaning roller 53 having a cleaning shaft 53A; a pressing member 54 that presses the cleaning roller 53 against the photoreceptor drum 51, the pressing member 54 in contact with an outer peripheral surface of the cleaning shaft 53A; and a cleaning electrode 56 that is electrically connected with the cleaning roller 53. The cleaning electrode 56 is electrically connected with the cleaning roller 53 with the pressing member 54 therebetween.SELECTED DRAWING: Figure 2

Description

Technical Field

[0001] The present disclosure relates to a drum cartridge including a cleaning roller for cleaning a photoreceptor drum.

Background Art

[0002] Conventionally, as a drum cartridge, one including a photoreceptor drum, a cleaning roller, a pressing member, and a cleaning electrode is known (see Patent Document 1). The photoreceptor drum is rotatable about a drum axis extending in a first direction. The cleaning roller has a cleaning shaft extending in the first direction.

[0003] The pressing member is a member that presses the cleaning roller against the photoreceptor drum in a second direction orthogonal to the first direction, and is in contact with the outer peripheral surface of the cleaning shaft. The cleaning electrode is in contact with one end of the cleaning shaft in the first direction.

[0004] The drum cartridge is detachable from a main body housing. The main body housing includes a main body electrode for supplying electricity to the cleaning electrode. The main body electrode has a contact portion that contacts the cleaning electrode, and a spring portion that biases the contact portion toward the cleaning electrode in the first direction.

Prior Art Documents

Patent Documents

[0005]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0006] However, in the prior art, since the pressing member contacts the outer peripheral surface of the cleaning shaft, friction occurs between the cleaning shaft and the pressing member. Further, in a state where the drum cartridge is attached to the main body housing, the cleaning electrode is pressed against one end of the cleaning shaft in the first direction by the biasing force of the main body electrode, so friction also occurs between the cleaning shaft and the cleaning electrode. Therefore, the frictional force applied to the cleaning shaft may increase, making it difficult for the cleaning roller to rotate.

[0007] Accordingly, an object of the present disclosure is to suppress an increase in the frictional force applied to the cleaning shaft and make it difficult for the cleaning roller to rotate when the drum cartridge includes a photosensitive drum, a cleaning roller, a pressing member, and a cleaning electrode.

Means for Solving the Problems

[0008] To solve the above problems, a drum cartridge according to the present disclosure includes a photosensitive drum rotatable about a drum shaft extending in a first direction, a cleaning roller contacting the photosensitive drum, the cleaning roller having a cleaning shaft, a pressing member pressing the cleaning roller against the photosensitive drum, the pressing member contacting the outer peripheral surface of the cleaning shaft, and a cleaning electrode electrically connected to the cleaning roller. The cleaning electrode is electrically connected to the cleaning roller via the pressing member.

[0009] According to this configuration, since the cleaning electrode is electrically connected to the cleaning shaft by using a pressing member for pressing the cleaning roller against the photosensitive drum, it is not necessary to press the cleaning electrode against one end of the cleaning shaft. That is, compared with the conventional structure, the friction between the cleaning electrode and the cleaning shaft can be eliminated. Therefore, when the drum cartridge includes the photosensitive drum, the cleaning roller, the pressing member, and the cleaning electrode, it is possible to suppress an increase in the frictional force applied to the cleaning shaft and suppress the cleaning roller from becoming difficult to rotate. Further, the structure can be simplified as compared with a structure in which the cleaning electrode is electrically connected to the cleaning shaft via a member different from the pressing member, for example.

[0010] Further, the cleaning roller may be rotatable about a cleaning shaft extending in the first direction, and the pressing member may press the cleaning roller against the photosensitive drum in a second direction intersecting the first direction.

[0011] Further, the second direction may be orthogonal to the first direction.

[0012] Further, the cleaning electrode may be separated from the cleaning shaft in the second direction.

[0013] Further, the cleaning shaft may be located between the photosensitive drum and the pressing member in the second direction.

[0014] Further, a connection spring for electrically connecting the pressing member and the cleaning electrode may be provided.

[0015] According to this configuration, the connection spring can more reliably make an electrical connection between the pressing member and the cleaning electrode.

[0016] Further, the connection spring may be located between the pressing member and the cleaning electrode in the first direction.

[0017] Further, the connection spring may be a coil spring that can expand and contract in the first direction.

[0018] Further, the cleaning electrode may be a first boss extending in the first direction and having a first boss that fits onto one end of the connection spring in the first direction.

[0019] According to this configuration, the first boss can prevent the connection spring from coming off the cleaning electrode.

[0020] Further, the pressing member may be a second boss extending in the first direction and having a second boss that fits onto the other end of the connection spring in the first direction.

[0021] According to this configuration, the second boss can prevent the connection spring from coming off the pressing member.

[0022] Further, the drum cartridge may include a drum frame that rotatably holds the photosensitive drum, and the drum frame may include a regulating boss that restricts the pressing member from moving in the first direction.

[0023] According to this configuration, the regulating boss can prevent the pressing member from shifting in the first direction.

[0024] Further, the pressing member may include a contact portion that contacts the cleaning shaft, and a first wall that extends from the contact portion to the side opposite to the cleaning shaft and is located between the regulating boss and the connection spring.

[0025] According to this configuration, the regulating boss can regulate the pressing member from moving in the first direction due to the biasing force of the connection spring.

[0026] Further, the pressing member has a second wall extending from the contact portion to the side opposite to the cleaning shaft, and the restricting boss may be located between the first wall and the second wall in the first direction.

[0027] According to this configuration, the restricting boss can restrict the pressing member from moving in one and the other directions of the first direction.

[0028] Further, a spring for biasing the pressing member toward the cleaning shaft is provided, and the restricting boss may hold the spring.

[0029] According to this configuration, compared with a structure in which a spring is held at a portion different from the restricting boss, the structure can be simplified.

[0030] Further, the spring is a torsion spring having a coil portion and two arm portions, and the restricting boss may be a boss that enters the coil portion.

[0031] Further, the drum cartridge is detachable from a main body housing having a main body electrode, and the cleaning electrode may contact the main body electrode in a state where the drum cartridge is attached to the main body housing.

[0032] Further, the cleaning electrode may have a contact surface that contacts the main body electrode in a state where the drum cartridge is attached to the main body housing, and a guide surface that guides the main body electrode to the contact surface in a process of attaching the drum cartridge to the main body housing.

[0033] According to this configuration, since the main body electrode is guided to the contact surface by the guide surface, the contact surface and the main body electrode can be brought into contact more reliably.

[0034] Further, the cleaning electrode may be made of a conductive resin.

[0035] Further, the pressing member may be made of a conductive resin.

Advantages of the Invention

[0036] According to the present disclosure, when the drum cartridge includes a photosensitive drum, a cleaning roller, a pressing member, and a cleaning electrode, it is possible to suppress an increase in the frictional force applied to the cleaning shaft and make it difficult for the cleaning roller to rotate.

Brief Description of the Drawings

[0037]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Embodiments for Carrying Out the Invention

[0038] Hereinafter, an embodiment of the present disclosure will be described in detail with reference to the drawings as appropriate. As shown in FIG. 1, the color printer 1 includes a main body housing 10, a sheet supply unit 20, an image forming unit 30, and a discharge unit 90.

[0039] The main body housing 10 has an opening 10A and an upper cover 11. The opening 10A is an opening through which a process cartridge 40 described later can pass. The upper cover 11 is a cover for opening and closing the opening 10A. The upper surface of the upper cover 11 serves as a discharge tray 11A for accumulating the sheet S discharged from the main body housing 10. The upper cover 11 has a plurality of LED mounting members 11B for holding the LED unit 31.

[0040] The sheet supply unit 20 includes a supply tray 21 and a sheet conveyance mechanism 22. The supply tray 21 accommodates the sheet S. The sheet conveyance mechanism 22 conveys the sheet S from the supply tray 21 toward the photoreceptor drum 51.

[0041] The image forming unit 30 includes four LED units 31, four process cartridges 40, a transfer unit 70, and a fixing device 80.

[0042] The LED unit 31 includes a plurality of LEDs (not shown) that expose the photoreceptor drum 51. The LED unit 31 is rotatably connected to the LED mounting member 11B.

[0043] The process cartridges 40 are arranged side by side in the front-rear direction between the upper cover 11 and the sheet supply unit 20. The process cartridge 40 includes a drum cartridge 50 and a developing cartridge 60. The drum cartridge 50 is detachable from the main body housing 10. The drum cartridge 50 includes a photoreceptor drum 51, a charger 52, and a cleaning roller 53.

[0044] The photoreceptor drum 51 is rotatable about a drum axis X1 extending in the first direction. The charger 52 includes a charging wire 52A for charging the photoreceptor drum 51. The charging wire 52A extends in the first direction.

[0045] The cleaning roller 53 is a roller for cleaning the photoreceptor drum 51. The cleaning roller 53 is in contact with the photoreceptor drum 51.

[0046] The developing cartridge 60 is detachable from the drum cartridge 50. The developing cartridge 60 includes a developing roller 61, a supply roller 62, and a toner storage chamber 63.

[0047] The developing roller 61 is a roller that supplies toner to the photosensitive drum 51. The supply roller 62 is a roller that supplies toner to the developing roller 61.

[0048] The transfer unit 70 includes a driving roller 71, a driven roller 72, a conveyor belt 73, and four transfer rollers 74. The driving roller 71 and the driven roller 72 are rollers for rotating the endless conveyor belt 73. The transfer roller 74 is disposed inside the conveyor belt 73. The transfer roller 74 sandwiches the conveyor belt 73 with the photosensitive drum 51.

[0049] The fixing device 80 includes a heating roller 81 and a pressure roller 82. The heating roller 81 is a roller that fixes the toner image on the sheet S conveyed from the photosensitive drum 51. The pressure roller 82 sandwiches the sheet S with the heating roller 81.

[0050] In the image forming unit 30, the charger 52 charges the surface of the photosensitive drum 51. Then, the LED unit 31 exposes the surface of the photosensitive drum 51. As a result, an electrostatic latent image is formed on the photosensitive drum 51.

[0051] The developing roller 61 supplies the toner in the toner storage chamber 63 to the electrostatic latent image on the photosensitive drum 51. As a result, a toner image is formed on the photosensitive drum 51.

[0052] The conveyor belt 73 conveys the sheet S. The sheet S passes between the photosensitive drum 51 and the transfer roller 74. At this time, the toner image on the photosensitive drum 51 is transferred to the sheet S. Then, the sheet S passes between the heating roller 81 and the pressure roller 82. At this time, the toner image on the sheet S is thermally fixed.

[0053] The discharge unit 90 includes a discharge roller 91. The discharge roller 91 discharges the sheet S conveyed from the fixing device 80 to the discharge tray 11A.

[0054] As shown in FIG. 2, the cleaning roller 53 is rotatable about a cleaning axis X2 extending in the first direction. The cleaning roller 53 has a cylindrical cleaning shaft 53A and a cylindrical roller portion 53B.

[0055] The cleaning shaft 53A is made of, for example, metal. The cleaning shaft 53A is separated from the photosensitive drum 51 in a second direction intersecting the first direction. In the present embodiment, the second direction is a direction along a straight line connecting the drum axis X1 and the cleaning axis X2. Preferably, the second direction is orthogonal to the first direction. The cleaning shaft 53A is located between the photosensitive drum 51 and the pressing member 54 in the second direction.

[0056] The roller portion 53B is made of, for example, rubber. The roller portion 53B covers a part of the cleaning shaft 53A. The roller portion 53B is in contact with the photosensitive drum 51.

[0057] The drum cartridge 50 further includes a pressing member 54, a spring 55, a cleaning electrode 56, a connection spring 57, and a drum frame 58. The pressing member 54 and the cleaning electrode 56 are made of a conductive resin. The spring 55 and the connection spring 57 are made of, for example, metal. The drum frame 58 is made of a non-conductive resin. The cleaning electrode 56 is electrically connected to the cleaning shaft 53A of the cleaning roller 53 via the connection spring 57 and the pressing member 54.

[0058] The connection spring 57 is a spring that electrically connects the pressing member 54 and the cleaning electrode 56. The connection spring 57 is located between the pressing member 54 and the cleaning electrode 56 in the first direction. The connection spring 57 is a coil spring that is stretchable in the first direction. One end of the connection spring 57 in the first direction contacts the cleaning electrode 56. The other end of the connection spring 57 in the first direction contacts the pressing member 54.

[0059] The cleaning electrode 56 has a first boss 56A extending in the first direction. The first boss 56A fits onto one end of the connection spring 57 in the first direction. The pressing member 54 has a second boss 54D extending in the first direction. The second boss 54D fits onto the other end of the connection spring 57 in the first direction.

[0060] The pressing member 54 is a member that presses the cleaning roller 53 against the photoreceptor drum 51 in the second direction. The pressing members 54 are arranged one each at one end and the other end in the first direction of the cleaning shaft 53A. The pressing member 54 on the one end side presses one end of the cleaning shaft 53A in the first direction toward the photoreceptor drum 51. The pressing member 54 on the other end side presses the other end of the cleaning shaft 53A in the first direction toward the photoreceptor drum 51. Since the pressing member 54 on the one end side and the pressing member 54 on the other end side have substantially the same structure, hereinafter, the pressing member 54 on the one end side will be described representatively. As shown in FIG. 3, the pressing member 54 further has a contact portion 54A, a first wall 54B, and a second wall 54C.

[0061] The contact portion 54A is a portion that contacts the outer peripheral surface of the cleaning shaft 53A (see also FIG. 4). The contact portion 54A has a C shape along the outer peripheral surface of the cleaning shaft 53A.

[0062] The first wall 54B and the second wall 54C extend from the contact portion 54A to the side opposite to the cleaning shaft 53A. The first wall 54B and the second wall 54C are arranged at intervals in the first direction. The second boss 54D extends in the first direction from the first wall 54B toward the side opposite to the second wall 54C.

[0063] The spring 55 is a torsion spring that biases the pressing member 54 toward the cleaning shaft 53A. The spring 55 has a coil portion 55A and two arm portions 55B, 55C. One arm portion 55B contacts the contact portion 54A of the pressing member 54. The other arm portion 55C contacts a base wall 58A (to be described later) of the drum frame 58.

[0064] The drum frame 58 has a base wall 58A, side walls 58B, protruding walls 58C, and regulating bosses 58D. The base wall 58A faces the outer peripheral surface of the photosensitive drum 51. The side walls 58B protrude from one end of the base wall 58A in the first direction. The side walls 58B rotatably hold one end of the photosensitive drum 51 in the first direction and one end of the cleaning shaft 53A in the first direction.

[0065] The protruding wall 58C protrudes from the base wall 58A in a direction intersecting the first and second directions. The tip of the protruding wall 58C faces the cleaning electrode 56 in the first direction.

[0066] The regulating boss 58D is a boss that protrudes in the first direction from the tip of the protruding wall 58C toward the cleaning electrode 56. The regulating boss 58D holds the spring 55 by entering into the coil portion 55A of the spring 55. As shown in FIG. 5, the first wall 54B of the pressing member 54 is positioned between the regulating boss 58D and the connecting spring 57 in the first direction. Thereby, the regulating boss 58D restricts the pressing member 54, which has received a force from the connecting spring 57, from moving in the first direction.

[0067] Also, the protruding wall 58C and the regulating boss 58D are positioned between the first wall 54B and the second wall 54C of the pressing member 54 in the first direction. Thereby, the movement of the pressing member 54 in one and the other directions of the first direction is restricted by the protruding wall 58C and the regulating boss 58D.

[0068] The main body housing 10 has a main body electrode 12 and a main body spring 13. The main body electrode 12 is an electrode that supplies electricity to the cleaning electrode 56. As shown in FIG. 5(c), the main body spring 13 biases the main body electrode 12 toward the drum cartridge 50 in the first direction in a state where the drum cartridge 50 is mounted on the main body housing 10.

[0069] The cleaning electrode 56 is an electrode that contacts the main body electrode 12 when the drum cartridge 50 is attached to the main body housing 10. The cleaning electrode 56 is attached to the side wall 58B of the drum frame 58. The cleaning electrode 56 is separated from the cleaning shaft 53A in the second direction. In the present embodiment, the cleaning electrode 56 is separated from the roller portion 53B in the second direction.

[0070] The cleaning electrode 56 has a contact surface 56B (see also FIG. 2) and a guide surface 56C. As shown in FIG. 5(c), the contact surface 56B is a surface that contacts the main body electrode 12 when the drum cartridge 50 is attached to the main body housing 10. The guide surface 56C is a surface that guides the main body electrode 12 to the contact surface 56B in the process of attaching the drum cartridge 50 to the main body housing 10, as shown in FIGS. 5(b) and (c).

[0071] The contact surface 56B intersects the first direction. Preferably, the contact surface 56B is orthogonal to the first direction. The guide surface 56C is connected to one end of the contact surface 56B in the second direction (the downstream end in the mounting direction of the drum cartridge 50). The guide surface 56C is inclined with respect to the contact surface 56B so as to approach the roller portion 53B in the first direction as it moves away from the contact surface 56B in the second direction.

[0072] Next, with reference to FIG. 5, the process of attaching the drum cartridge 50 to the main body housing 10 and the actions of the cleaning electrode 56, the main body electrode 12, and the main body spring 13 in the state where the drum cartridge 50 is attached to the main body housing 10 will be described.

[0073] As shown in FIGS. 5(a) and (b), when the drum cartridge 50 is attached to the main body housing 10, the guide surface 56C of the cleaning electrode 56 contacts the main body electrode 12. The guide surface 56C moves the main body electrode 12 in a direction away from the drum cartridge 50 in the first direction against the biasing force of the main body spring 13. As a result, as shown in FIGS. 5(b) and (c), the main body electrode 12 is guided to the contact surface 56B by the guide surface 56C.

[0074] As shown in FIG. 5(c), when the drum cartridge 50 is mounted on the main body housing 10, the biasing force of the main body spring 13 acts on the cleaning electrode 56. However, since the cleaning electrode 56 is attached to the side wall 58B of the drum frame 58 at a position away from the cleaning roller 53 in the second direction, the biasing force of the main body spring 13 in the first direction is not applied to the cleaning roller 53.

[0075] When electricity is supplied to the cleaning roller 53 by a power source (not shown), the electricity is supplied from the power source to the cleaning electrode 56 via the main body spring 13 and the main body electrode 12. The electricity supplied to the cleaning electrode 56 is supplied to the cleaning shaft 53A via the connection spring 57 and the pressing member 54.

[0076] According to the above, the following effects can be obtained in the present embodiment. In the present embodiment, the cleaning electrode 56 is electrically connected to the cleaning shaft 53A by using the pressing member 54 for pressing the cleaning roller 53 against the photosensitive drum 51. Therefore, the cleaning electrode 56 does not contact one end of the cleaning shaft 53A. As a result, it is possible to suppress the cleaning roller 53 from becoming difficult to rotate due to an increase in the frictional force applied to the cleaning shaft 53A. In addition, the structure can be simplified as compared with a structure in which the cleaning electrode is electrically connected to the cleaning shaft via a member different from the pressing member, for example.

[0077] Since the connection spring 57 electrically connects the pressing member 54 and the cleaning electrode 56, the electrical connection between the pressing member 54 and the cleaning electrode 56 can be made more reliable.

[0078] Since the cleaning electrode 56 has the first boss 56A into which one end of the connection spring 57 fits, it is possible to prevent the connection spring 57 from coming off the cleaning electrode 56.

[0079] Since the pressing member 54 has the second boss 54D that fits onto the other end of the connection spring 57, it is possible to prevent the connection spring 57 from coming off the pressing member 54.

[0080] Since the movement of the pressing member 54 in the first direction is restricted by the restricting boss 58D, it is possible to prevent the pressing member 54 from shifting in the first direction.

[0081] Since the first wall 54B of the pressing member 54 is positioned between the restricting boss 58D and the connection spring 57, the restricting boss 58D can restrict the pressing member 54 from moving in the first direction due to the biasing force of the connection spring 57.

[0082] Since the restricting boss 58D is positioned between the first wall 54B and the second wall 54C in the first direction, the restricting boss 58D can restrict the pressing member 54 from moving in one direction and the other direction in the first direction.

[0083] Since the restricting boss 58D holds the spring 55, the structure can be simplified compared to a structure that holds the spring at a location separate from the restricting boss, for example.

[0084] Since the main body electrode 12 is guided to the contact surface 56B by the guide surface 56C, the contact surface 56B and the main body electrode 12 can be brought into contact more reliably.

[0085] Note that the present disclosure is not limited to the above-described embodiment and can be used in various forms as exemplified below.

[0086] In the above-described embodiment, a connection spring is interposed between the cleaning electrode and the pressing member. However, the present disclosure is not limited to this, and the connection spring may not be provided. In this case, for example, the cleaning electrode may be brought into contact with the pressing member. Also, at least one of the pressing member and the cleaning electrode may be configured by a leaf spring, a wire spring, or the like.

[0087] The connecting spring is not limited to a coil spring, and may be other springs such as a torsion spring or a leaf spring. The spring is not limited to a torsion spring, and may be other springs such as a leaf spring or a coil spring.

[0088] Each element described in the above embodiments and modifications may be implemented in any combination.

Description of Reference Numerals

[0089] 50 Drum Cartridge 51 Photoconductor Drum 53 Cleaning Roller 53A Cleaning Shaft 54 Pressing Member 56 Cleaning Electrode

Claims

1. A photosensitive drum rotatable about a drum shaft extending in a first direction, a cleaning roller in contact with the photosensitive drum, the cleaning roller having a cleaning shaft, a pressing member for pressing the cleaning roller against the photosensitive drum, the pressing member being in contact with an outer peripheral surface of the cleaning shaft, a cleaning electrode electrically connected to the cleaning roller, and a connection spring for electrically connecting the pressing member and the cleaning electrode, wherein the cleaning electrode is electrically connected to the cleaning roller via the connection spring and the pressing member, and the connection spring is located between the pressing member and the cleaning electrode in the first direction. A drum cartridge characterized by this.

2. The cleaning roller is rotatable about a cleaning shaft extending in the first direction, and the pressing member presses the cleaning roller against the photosensitive drum in a second direction intersecting the first direction. The drum cartridge according to Claim 1, characterized by this.

3. The drum cartridge according to Claim 2, characterized in that the second direction is orthogonal to the first direction.

4. The drum cartridge according to Claim 2 or Claim 3, characterized in that the cleaning electrode is separated from the cleaning shaft in the second direction.

5. The drum cartridge according to any one of Claims 2 to 4, characterized in that the cleaning shaft is located between the photosensitive drum and the pressing member in the second direction.

6. The drum cartridge according to any one of Claims 1 to 5, characterized in that the connection spring is a coil spring that can expand and contract in the first direction.

7. The drum cartridge according to Claim 6, characterized in that the cleaning electrode is a first boss extending in the first direction and has a first boss that fits onto one end of the connection spring in the first direction.

8. The drum cartridge according to Claim 7, characterized in that the pressing member is a second boss extending in the first direction and has a second boss that fits onto the other end of the connection spring in the first direction.

9. A photosensitive drum rotatable about a drum shaft extending in a first direction, A cleaning roller that contacts the photosensitive drum, the cleaning roller having a cleaning shaft; A pressing member that presses the cleaning roller against the photosensitive drum, the pressing member contacting an outer peripheral surface of the cleaning shaft; A cleaning electrode electrically connected to the cleaning roller; A connection spring that electrically connects the pressing member and the cleaning electrode; A drum frame that rotatably holds the photosensitive drum, and comprising: The cleaning electrode is electrically connected to the cleaning roller via the connection spring and the pressing member; The drum frame, A drum cartridge characterized in that the drum frame includes a regulating boss that restricts movement of the pressing member in the first direction.

10. The pressing member, A contact portion that contacts the cleaning shaft, A first wall extending from the contact portion to a side opposite to the cleaning shaft, the first wall being located between the regulating boss and the connection spring, the drum cartridge according to claim 9, characterized by having the first wall.

11. The pressing member has a second wall extending from the contact portion to a side opposite to the cleaning shaft, The regulating boss is located between the first wall and the second wall in the first direction, the drum cartridge according to claim 10, characterized by this arrangement.

12. A spring that biases the pressing member toward the cleaning shaft is provided, The regulating boss holds the spring, the drum cartridge according to any one of claims 9 to 11, characterized by this feature.

13. The spring is a torsion spring having a coil portion and two arm portions, The regulating boss enters the coil portion, the drum cartridge according to claim 12, characterized by this configuration.

14. The drum cartridge is detachable from a main body housing having a main body electrode, The cleaning electrode contacts the main body electrode when the drum cartridge is mounted on the main body housing, the drum cartridge according to any one of claims 1 to 13, characterized by this contact.

15. The cleaning electrode, A contact surface that contacts the main body electrode when the drum cartridge is mounted on the main body housing, The drum cartridge according to claim 14, further comprising a guide surface for guiding the main body electrode to the contact surface in a process of mounting the drum cartridge to the main body housing.

16. The drum cartridge according to any one of claims 1 to 15, wherein the cleaning electrode is made of a conductive resin.

17. The drum cartridge according to any one of claims 1 to 16, wherein the pressing member is made of a conductive resin.

18. A photosensitive drum rotatable about a drum shaft extending in a first direction, A cleaning roller in contact with the photosensitive drum, the cleaning roller having a cleaning shaft, A pressing member for pressing the cleaning roller against the photosensitive drum, the pressing member being in contact with an outer peripheral surface of the cleaning shaft, A drum cartridge including a cleaning electrode electrically connected to the cleaning roller, The cleaning electrode is electrically connected to the cleaning roller via the pressing member, The drum cartridge is detachable from a main body housing having a main body electrode, The cleaning electrode, A contact surface that contacts the main body electrode in a state where the drum cartridge is mounted to the main body housing, A guide surface for guiding the main body electrode to the contact surface in a process of mounting the drum cartridge to the main body housing, and characterized by a drum cartridge.

Images