Cartridges including detection member and cover member

1. A cartridge comprising:

a developing roller configured to rotate about a first axis extending along a first direction;

an electrode configured to electrically connect to the developing roller, the electrode comprising:

a main body; and

a protrusion protruding along the first direction from the main body to an end portion of the protrusion;

a detection member that is rotatably supported on the protrusion, the detection member comprising a cover portion configured to cover an exposable portion of the protrusion when the detection member is in a first rotational position and to expose the exposable portion of the protrusion when the detection member is in a second rotational position; and

a cover member configured to cover a portion of the detection member, the cover member forming an opening therein that is configured to expose the cover portion of the detection member when the detection member is in the first rotational position, and the cover member extending along the first direction to an end portion of the cover member,

wherein an overlap portion of the end portion of the protrusion extends at least to the end portion of the cover member, such that the overlap portion overlaps a portion of the end portion of the cover member in a second direction that is perpendicular to the first direction.

2. The cartridge according to claim 1 ,

wherein the cover portion extends in the first direction to an end face of the cover portion, and

wherein the overlap portion extends to a position farther from the main body in the first direction than a position of the end face of the cover portion.

3. The cartridge according to claim 2 , wherein the cover member is configured to limit deformation of the overlap portion in the second direction to a particular amount of deformation.

4. The cartridge according to claim 1 ,

wherein the cover portion extends in the first direction to an end face of the cover portion, and

wherein the cover member is configured to cover the end face of the cover portion when the detection member is in the second rotational position.

5. The cartridge according to claim 1 ,

wherein another portion of the end portion of the protrusion, which is different from the overlap portion, comprises an end face, and

wherein the cover member covers the end face.

6. The cartridge according to claim 5 , wherein the cover member comprises a fit portion that fits with the other portion of the end portion of the protrusion, which is different from the overlap portion.

7. The cartridge according to claim 6 ,

wherein the protrusion of the electrode comprises a substantially tubular shape, and

wherein the fit portion is disposed inside the protrusion.

8. The cartridge according to claim 6 , further comprising

a casing comprising:

an accommodation portion configured to accommodate developer, and

another protrusion protruding in the first direction,

wherein the protrusion forms a hole into which the projection of the casing fits.

9. The cartridge according to claim 1 ,

wherein a remaining portion of the end portion of the protrusion other than the overlap portion, comprises an end face, and

wherein the cover member covers the end face.

10. The cartridge according to claim 1 , wherein the overlap portion comprises a substantially arc-shaped cross-section in a plane normal to the first direction.

11. The cartridge according to claim 1 ,

wherein the overlap portion comprises a substantially arc-shaped cross-section in a plane normal to the first direction, and

wherein another portion of the end portion of the protrusion, which is closer to the main body than and different from the overlap portion, comprises a substantially elliptical-shaped cross section in another plane normal to the first direction.

12. The cartridge according to claim 1 ,

wherein the end portion of the cover member comprises:

an end face opposite to a main body side of the cover member; and

an interior face that is substantially perpendicular to the first direction, disposed closer to the main body than the end face, and substantially aligned with the protrusion in the first direction,

wherein the exposable portion of the protrusion is substantially aligned in the first direction with the overlap portion, and

wherein the overlap portion extends to at least the interior face.

13. The cartridge according to claim 1 , wherein the overlap portion contacts the portion of the end portion of the cover member that the overlap portion overlaps in the second direction.

14. The cartridge according to claim 1 ,

wherein the detection member is configured to:

move from the first rotational position to the second rotational position, the protrusion configured to contact an electrical interface of a printer through the exposable portion when the detection member is in the second rotational position, the cover portion configured to be disposed between the protrusion and the electrical interface when the detection member is in the first rotational position, and

move from the first rotational position to a third rotational position, in which the protrusion is configured to contact the electrical interface through the exposable portion.

15. The cartridge according to claim 1 , wherein a dimension of the cover portion along a rotational direction of the detection member corresponds to information about the cartridge.

16. The cartridge according to claim 1 , wherein the cover portion is configured to overlap with the protrusion in the second direction.

17. The cartridge according to claim 1 , wherein the detection member comprises a sector gear.

18. The cartridge according to claim 1 , wherein the electrode comprises a supporter that supports the developing roller rotatably.

19. The cartridge according to claim 1 , further comprising:

a rotating member configured to rotate around a second axis;

a casing forming a developer accommodation space comprising:

a first wall, and

a second wall separated from the first wall in the first direction, the rotating member disposed between the first wall and the second wall; and

a coupling member, which is disposed on a side of the first wall that is opposite to the developer accommodation space, configured to receive a driving force,

wherein the detection member, which is disposed on a side of the second wall that is opposite to the developer accommodation space, is configured to receive the driving force from the rotating member.

20. The cartridge according to claim 19 , further comprising:

a first transmitting member, which is disposed on the side of the first wall that is opposite to the developer accommodation space, configured to rotate around the second axis and to transmit the driving force from the coupling member to the rotating member; and

a second transmitting member, which is disposed on the side of the second wall that is opposite to the developer accommodation space, configured to rotate around the second axis and to transmit the driving force from the rotating member to the detection member.

21. The cartridge according to claim 20 , wherein the first transmitting member comprises a first gear, the second transmitting member comprises a second gear, and a number of teeth of the first gear is different from a number of teeth of the second gear.

22. The cartridge according to claim 21 , wherein the number of teeth of the first gear is greater than the number of the teeth of the second gear.

23. The cartridge according to claim 19 , wherein the detection member overlaps with the coupling member in the first direction.

24. The cartridge according to claim 19 , wherein the protrusion overlaps with the coupling member in the first direction.

25. The cartridge according to claim 19 , wherein the rotating member is an agitator configured to agitate developer.

26. A cartridge comprising:

a developing roller configured to rotate about a first axis extending along a first direction;

an electrode configured to electrically connect to the developing roller, the electrode comprising:

a main body; and

a protrusion protruding along the first direction from the main body to an end portion of the protrusion;

a detection member that is rotatably supported on the protrusion, the detection member comprising a cover portion that covers a portion of the protrusion and that exposes another portion of the protrusion; and

a cover member forming an opening that exposes the cover portion of the detection member, the cover member covering another portion of the detection member, and the cover member extending along the first direction to an end portion of the cover member,

wherein an overlap portion of the end portion of the protrusion extends at least to the end portion of the cover member, such that the overlap portion overlaps a portion of the end portion of the cover member in a second direction that is perpendicular to the first direction.

27. A cartridge comprising:

a developing roller configured to rotate about a first axis extending along a first direction;

an electrode configured to electrically connect to the developing roller, the electrode comprising:

a main body; and

a protrusion protruding along the first direction from the main body to an end portion of the protrusion;

a detection member that is rotatably supported on the protrusion, the detection member comprising a cover portion that covers a portion of the protrusion and that exposes another portion of the protrusion; and

a cover member forming an opening that exposes the other portion of the protrusion, the cover member covering at least a portion of the cover portion, and the cover member extending along the first direction to an end portion of the cover member,

wherein an overlap portion of the end portion of the protrusion extends at least to the end portion of the cover member, such that the overlap portion overlaps a portion of the end portion of the cover member in a second direction that is perpendicular to the first direction.

28. A cartridge comprising:

a developing roller configured to rotate about a first axis;

an electrode comprising:

a first base portion, and

a first protrusion extending from the first base portion in a first direction parallel to the first axis of the developing roller and comprising a first portion and a second portion, the second portion of the first protrusion disposed between the first base portion of the electrode and the first portion of the first protrusion;

a detection member comprising:

a second base portion rotatably supported at the second portion of the first protrusion and configured to rotate about a second axis, and

at least one second protrusion extending from the second base portion along the first portion of the first protrusion in the first direction; and

a frame forming an opening, the opening defined in a frame surface ex ding in the first direction,

wherein an outer surface of the first portion of the first protrusion comprises:

a third portion comprising an entire portion of the outer surface between the second axis and the at least one second protrusion; and

a fourth portion that is another portion of the outer surface of the protrusion; and

a fifth portion outside the frame and beyond the frame surface, and

wherein an overlap portion of the first portion of the first protrusion extends at least to an end portion of the frame in the first direction, such that the overlap portion overlaps a portion of the end portion of the frame in a second direction that is perpendicular to the first direction.