DEVELOPING APPARATUS, PROCESS CARTRIDGE AND ELECTROPHOTOGRAPHIC IMAGE FORMING APPARATUS

• US 20110268473A1
• Filed: 06/30/2011
• Published: 11/03/2011
• Est. Priority Date: 12/11/2006
• Status: Active Grant

• Current Assignee: Canon Kabushiki Kaisha (Canon Inc.)
• Original Assignee: Canon Kabushiki Kaisha (Canon Inc.)
• Inventors: Hashimoto, Koji
• Granted Patent: US 8,285,173 B2
• Time in Patent Office: Days
• US Class Current: 399/111
• CPC Class Codes: G03G 21/186 Axial couplings
• CPC Class Codes: G03G 21/1864 associated with a positioning function
• CPC Class Codes: G03G 2221/1654 Locks and means for positioning or alignment
• CPC Class Codes: G03G 2221/1657 transmitting mechanical drive power

Abstract

A process cartridge is detachably mountable to a main assembly of an electrophotographic image forming apparatus The cartridge includes a photosensitive drum, and a developing roller for developing a latent image. A development decoupling portion is provided adjacent to one axial end of the developing roller, with the development coupling portion including an engaging portion configured and positioned (a) to receive a driving force for rotating the developing roller, and (b) to be movable in a direction crossing the axis of the developing roller relative to the developing roller. The cartridge also includes an urging portion configured and positioned to urge the engaging portion in a direction crossing the axis of the developing roller. Also, an abutting portion is configured and positioned so that movement of the engaging portion can be prevented when the engagement portion has not established engagement with a development coupling member of the main assembly.

Claims

1-25. -25. (canceled)

26. A process cartridge detachably mountable to a main assembly of an electrophotographic image forming apparatus that includes a drum coupling member, a development coupling member, and an abutting member, said process cartridge comprising:

(i) a photosensitive drum;

(ii) a drum coupling portion provided adjacent to one axial end of said photosensitive drum, configured and positioned to engage with the drum coupling member to receive a driving force for rotating said photosensitive drum;

(iii) a developing roller configured and positioned (a) to develop an electrostatic latent image formed on said photosensitive drum, and (b) to be rotatable about an axis thereof;

(iv) a development coupling portion provided adjacent to one axial end of said developing roller, said development coupling portion including;

an engaging portion configured and positioned (a) to engage with the development coupling member and to receive a driving force for rotating said developing roller and (b) to be movable in a direction crossing the axis of said developing roller relative to said developing roller;

(v) an urging portion configured and positioned to urge said engaging portion in a direction crossing the axis of said developing roller to enable engagement of said engaging portion with the development coupling member with insertion of said process cartridge into the main assembly of the apparatus along an axial direction of said developing roller; and

(vi) an abutting portion configured and positioned to abut the abutting member so that a movement, relative to the abutting member, of said engaging portion which has not been established in engagement with the development coupling member in the direction crossing the axis of said developing roller is prevented, when said process cartridge which has been inserted into the main assembly of the apparatus is moved in a direction crossing the axis of said developing roller, so as to enable engagement of said drum coupling portion with the drum coupling member.

27. A process cartridge according to claim 26, further comprising a regulating portion configured and positioned to regulate a position of said engaging portion which is urged by said urging portion.

28. A process cartridge according to claim 27, wherein said regulating portion regulates the position of said engaging portion so that a distance between an axis of said photosensitive drum and an axis of said engaging portion which is urged by said urging portion is shorter than a distance between the axis of said photosensitive drum and the axis of said developing roller when said process cartridge is inserted into the main assembly of the apparatus.

29. A process cartridge according to claim 28, wherein, when said developing roller develops the electrostatic image on said photosensitive drum, the axis of said engaging portion and the axis of said developing roller are substantially aligned with each other.

30. A process cartridge according to claim 27 or 28, further comprising a bearing portion configured and positioned to rotatably support said photosensitive drum, wherein said regulating portion is provided on said bearing portion.

31. A process cartridge according to claim 30, further comprising a positioning portion, provided on said bearing portion, configured and positioned to position said photosensitive drum by abutting to a main assembly positioning portion provided in the main assembly of the apparatus when said process cartridge, which has been inserted in the main assembly of the apparatus, is moved in the direction crossing the axis of said developing roller.

32. A process cartridge according to claim 27 or 28, further comprising a holding portion configured and positioned to rotatably hold said engaging portion, said holding portion being movable in a direction crossing the axis of said developing roller together with said engaging portion,

wherein said urging portion urges said engaging portion through said holding portion, and

wherein said abutting portion is provided on said holding portion.

33. A process cartridge according to claim 27 or 28, wherein said developing roller is movable between a contact position where said developing roller contacts said photosensitive drum, and a spaced position where said developing roller is spaced away from said photosensitive drum, and

wherein said engaging portion is movable in the direction crossing the axis of said developing roller relative to said developing roller so as to permit said developing roller to move between the contact position and the spaced position.

34. A process cartridge according to claim 33, further comprising:

an urging member configured and positioned to urge said developing roller into contact with said photosensitive drum; and

a locking portion configured and positioned to lock a position of said developing roller relative to said photosensitive drum against an urging force of said urging member to maintain said developing roller at a position where said developing roller is spaced away from said photosensitive drum,

wherein said locking portion is unlocked with the insertion of said process cartridge into the main assembly of the apparatus.

35. A process cartridge according to claim 34, further comprising a force receiving portion configured and positioned to receive, from the main assembly of the apparatus, a force for maintaining said developing roller spaced away from said photosensitive drum with unlocking of said locking portion.

36. A process cartridge according to claim 35, wherein said developing roller is unified together with a developer container, configured and positioned to contain the developer, into a drum unit,

wherein said photosensitive drum is unified, into a drum unit, together with (a) a charging member configured and positioned to electrically charge said photosensitive drum, and (b) a cleaning member configured and positioned to clean said photosensitive drum, and

wherein said developing unit and said drum unit are connected so as to be rotatable relative to each other.

37. A process cartridge according to claim 27 or 28, wherein in the case that said engaging portion has been established the engagement with the development coupling member with the insertion of said process cartridge into the main assembly of the apparatus, the movement of said engaging portion in the direction crossing the axis of said developing roller when said process cartridge is moved in the direction crossing the axis of said developing roller is regulated by the development coupling member without abutting of said abutting portion with the abutting member.

38. A process cartridge according to claim 27 or 28, wherein said urging portion is an elastic member.

39. A process cartridge according to claim 27 or 28, wherein said coupling member includes:

a driven portion fixed to the one axial end of said developing roller; and

an intermediary portion configured and positioned to (a) engage with said driven portion and (b) be movable relative to said driven portion in a direction crossing the axis of said developing roller while maintaining engagement with said driven portion,

wherein said engaging portion is configured and positioned to (a) engage with said intermediary portion, and (b) be movable relative to said intermediary portion in the direction which is different from the direction of movement of said intermediary portion while maintaining engagement of said engaging portion with said intermediary portion.

40. A process cartridge according to claim 26, wherein said photosensitive drum and said developing roller receive respective driving forces independently from each other.

41. A process cartridge according to claim 40, further comprising a drum coupling member provided adjacent to one axial end of said photosensitive drum and capable of receiving a driving force for rotating said photosensitive drum.

42. An electrophotographic image forming apparatus including a main assembly of said apparatus and a process cartridge detachably mountable to said main assembly of said apparatus, comprising:

(1) said main assembly of said apparatus including;

(i) a drum coupling member configured and positioned to apply a driving force;

(ii) a development coupling member configured and positioned to apply a driving force; and

(iii) an abutting member configured and positioned to abut to said process cartridge; and

(2) said process cartridge including;

(i) a photosensitive drum;

(ii) a drum coupling portion provided adjacent to one axial end of said photosensitive drum, configured and positioned to engage with said drum coupling member to receive a driving force for rotating said photosensitive drum;

(iii) a developing roller configured and positioned (a) to develop an electrostatic latent image formed on said photosensitive drum, and (b) to be rotatable about an axis thereof;

(iv) a development coupling portion provided adjacent to one axial end of said developing roller, said development coupling portion including;

an engaging portion configured and positioned (a) to engage with said development coupling member to receive a driving force for rotating said developing roller and (b) to be movable in a direction crossing the axis of said developing roller relative to said developing roller;

(v) an urging portion configured and positioned to urge said engaging portion in a direction crossing the axis of said developing roller to enable engagement of said engaging portion with said development coupling member with insertion of said process cartridge into said main assembly of said apparatus along an axial direction of said developing roller;

(vi) an abutting portion configured and positioned to abut said abutting member so that a movement, relative to said abutting member, of said engaging portion which has not been established an engagement with said development coupling member in the direction crossing the axis of said developing roller is prevented, when said process cartridge, which has been inserted into said main assembly of said apparatus, is moved in a direction crossing the axis of said developing roller, so as to enable engagement of said drum coupling portion with said drum coupling member.

43. An electrophotographic image forming apparatus according to claim 42, wherein said process cartridge includes a regulating portion configured and positioned to regulate a position of said engaging portion which is urged by said urging portion.

44. An electrophotographic image forming apparatus according to claim 43, wherein said regulating portion regulates the position of said engaging portion so that a distance between an axis of said photosensitive drum and an axis of said engaging portion which is urged by said urging portion is shorter than a distance between the axis of said photosensitive drum and the axis of said developing roller when said process cartridge is inserted into said main assembly of said apparatus.

45. An electrophotographic image forming apparatus according to claim 44, wherein, when said developing roller develops the electrostatic image on said photosensitive drum, the axis of said engaging portion and the axis of said developing roller are substantially aligned with each other.

46. An electrophotographic image forming apparatus according to claim 43 or 44, wherein said process cartridge includes a bearing portion configured and positioned to rotatably support said photosensitive drum, and wherein said regulating portion is provided on said bearing portion.

47. An electrophotographic image forming apparatus according to claim 46, wherein said main assembly of said apparatus includes a main assembly positioning portion, and wherein said process cartridge includes a positioning portion, provided on said bearing portion, configured and positioned to position said photosensitive drum by abutting to said main assembly positioning portion when said process cartridge which has been inserted in said main assembly of said apparatus is moved in the direction crossing the axis of said developing roller.

48. An electrophotographic image forming apparatus according to claim 43 or 44,

wherein said process cartridge includes a holding portion configured and positioned to rotatably hold said engaging portion, said holding portion being movable in a direction crossing the axis of said developing roller together with said engaging portion;

wherein said urging portion urges said engaging portion through said holding portion; and

wherein said abutting portion is provided on said holding portion.

49. An electrophotographic image forming apparatus according to claim 43 or 44,

wherein said developing roller is movable between a contact position where said developing roller contacts said photosensitive drum and a spaced position where said developing roller is spaced away from said photosensitive drum;

and

wherein said engaging portion is movable in the direction crossing the axis of said developing roller relative to said developing roller so as to permit said developing roller to move between the contact position and the spaced position.

50. An electrophotographic image forming apparatus according to claim 49, wherein said process cartridge includes:

an urging member configured and positioned to urge said developing roller into contact with said photosensitive drum; and

a locking portion configured and positioned to lock a position of said developing roller relative to said photosensitive drum against an urging force of said urging member to maintain said developing roller at a position where said developing roller is spaced away from said photosensitive drum,

wherein said locking portion is unlocked with the insertion of said process cartridge into said main assembly of said apparatus.

51. An electrophotographic image forming apparatus according to claim 50, wherein said process cartridge includes a force receiving portion configured and positioned to receive, from said main assembly of said apparatus, a force for maintaining said developing roller spaced away from said photosensitive drum with unlocking of said locking portion.

52. An electrophotographic image forming apparatus according to claim 51,

wherein said developing roller is unified, into a developing unit, together with a developer container configured and positioned to contain the developer,

wherein said photosensitive drum is unified, into a drum unit, together with (a) a charging member configured and positioned to electrically charge said photosensitive drum and (b) a cleaning member configured and positioned to clean said photosensitive drum, and

wherein said developing unit and said drum unit are connected so as to be rotatable relative to each other.

53. An electrophotographic image forming apparatus according to claim 43 or 44, wherein, in the case that said engaging portion has established engagement with said development coupling member with the insertion of said process cartridge into said main assembly of said apparatus, the movement of said engaging portion in the direction crossing the axis of said developing roller when said process cartridge is moved in the direction crossing the axis of said developing roller is regulated by said development coupling member without abutting of said abutting portion with said abutting member.

54. An electrophotographic image forming apparatus according to claim 43 or 44, wherein said urging portion is an elastic member.

55. An electrophotographic image forming apparatus according to claim 43 or 44, wherein said coupling member includes:

a driven portion fixed to the one axial end of said developing roller; and

an intermediary portion configured and positioned (a) to engage with said driven portion and (b) to be movable relative to said driven portion in a direction crossing the axis of said developing roller while maintaining engagement with said driven portion,

wherein said engaging portion configured and positioned (a) to engage with said intermediary portion and (b) to be movable relative to said intermediary portion in the direction which is different from the direction of movement of said intermediary portion while maintaining engagement of said engaging portion with said intermediary portion.

56. An electrophotographic image forming apparatus according to claim 55, wherein said photosensitive drum and said developing roller receive respective driving forces independently from each other.

57. An electrophotographic image forming apparatus according to claim 55, wherein said process cartridge includes a drum coupling member provided adjacent to one axial end of said photosensitive drum and capable of receiving a driving force for rotating said photosensitive drum.

58. A development cartridge detachably mountable to a main assembly of an electrophotographic image forming apparatus, including a development coupling member and an abutting member, said development cartridge comprising:

(i) a developing roller rotatable about an axis thereof;

(ii) a development coupling portion provided adjacent to one axial end of said developing roller, said development coupling portion including;

an engaging portion configured and positioned (a) to engage with the development coupling member to receive a driving force for rotating said developing roller, and (b) to be movable in a direction crossing the axis of said developing roller relative to said developing roller;

(iii) an urging portion configured and positioned to urge said engaging portion in a direction crossing the axis of said developing roller to enable engagement of said engaging portion with the development coupling member with insertion of said development cartridge into the main assembly of the apparatus along an axial direction of said developing roller; and

(iv) an abutting portion configured and positioned to abut to the abutting member so that a movement, relative to the abutting member, of said engaging portion which has not been established in engagement with the development coupling member in the direction crossing the axis of said developing roller is regulated, when said development cartridge, which has been inserted into the main assembly of the apparatus, is moved in a direction crossing the axis of said developing roller.