Cartridge and image forming apparatus

1. A cartridge including an image bearing member and a rotatable charging roller for charging the image bearing member and capable of moving the charging roller from a first position to a second position closer to the image bearing member than the first position, the cartridge comprising:

a first maintaining member and a second maintaining member, disposed on respective end portions of the charging roller in an axial direction of the charging roller, the first and second maintaining members being configured to maintain a position of the charging roller at the first position by contacting with the respective end portions of the image bearing member; and

a first moving portion and a second moving portion, disposed on respective end portions of the image bearing member in an axial direction of the image bearing member, the first and second moving portions being configured to rotate about a rotational axis of the image bearing member and contact with and move the first maintaining member and the second maintaining member, respectively, according to a rotation of the image bearing member so as to move the charging roller from the first position to the second position,

wherein a contacting portion of the first maintaining member contacting with the first moving portion and a contacting portion of the second maintaining member contacting with the second moving portion are disposed on same positions with respect to a circumferential direction centering on an axis line of the image bearing member when the charging member is at first position and viewed from the axial direction of the image bearing member, and

wherein, in a case where the image bearing member is rotated in a state in which the charging roller is in the first position, the first moving portion abuts on the first maintaining member, and then the second moving portion abuts on the second maintaining member.

2. The cartridge according to claim 1 , further comprising an urging member configured to urge the charging roller toward the image bearing member.

3. The cartridge according to claim 2 , wherein the urging member urges both end portions of the charging roller in the axial direction.

4. The cartridge according to claim 1 , wherein, when the second moving portion abuts on the second maintaining member, the first moving portion does not abut on the first maintaining member.

5. A cartridge including an image bearing member and a rotatable charging roller for charging the image bearing member and capable of moving the charging roller from a first position to a second position closer to the image bearing member than the first position, the cartridge comprising:

a first maintaining member and a second maintaining member, disposed on respective end portions of the charging roller in an axial direction of the charging roller, the first and second maintaining members being configured to maintain a position of the charging roller at the first position by contacting with the respective end portions of the image bearing member; and

a first moving portion and a second moving portion, disposed on respective end portions of the image bearing member in an axial direction of the image bearing member, the first and second moving portions being configured to rotate about a rotational axis of the image bearing member and contact with and move the first maintaining member and the second maintaining member, respectively, according to a rotation of the image bearing member so as to move the charging roller from the first position to the second position,

wherein a contacting portion of the first maintaining member contacting with the first moving portion and a contacting portion of the second maintaining member contacting with the second moving portion are disposed on same positions with respect to a circumferential direction centering on an axis line of the image bearing member when the charging member is at first position and viewed from the axial direction of the image bearing member, and

wherein the first moving portion and the second moving portion are disposed on different positions with respect to a circumferential direction centering on an axis line of the image bearing member when viewed from the axial direction of the image bearing member.

6. The cartridge according to claim 5 , further comprising an urging member configured to urge the charging roller toward the image bearing member.

7. The cartridge according to claim 6 , wherein the urging member urges both end portions of the charging roller in the axial direction of the charging roller.

8. The cartridge according to claim 5 , wherein, when the second moving portion abuts on the second maintaining member, the first moving portion does not abut on the first maintaining member.

9. A cartridge including an image bearing member and a process member acting on the image bearing member and capable of moving the process member from a first position to a second position closer to the image bearing member than the first position, the cartridge comprising:

a first maintaining member and a second maintaining member, disposed on respective end portions of the process member in a longitudinal direction, the first and second maintaining members being configured to maintain a position of the process member at the first position by contacting with respective end portions of the image bearing member; and

a first moving portion and a second moving portion disposed on respective end portions of the image bearing member in an axial direction of the image bearing member, the first and second moving portions being configured to rotate about a rotational axis of the image bearing member and contact with and move the first maintaining member and the second maintaining member, respectively, according to a rotation of the image bearing member so as to move the process member from the first position to the second position,

wherein a contacting portion of the first maintaining member contacting with the first moving portion and a contacting portion of the second maintaining member contacting with the second moving portion are disposed on same positions with respect to a circumferential direction centering on an axis line of the image bearing member when the process member is at first position and viewed from the axial direction of the image bearing member, and

wherein, in a case where the image bearing member is rotated in a state in which the process member is in the first position, the first moving portion abuts on the first maintaining member, and then the second moving portion abuts on the second maintaining member.

10. The cartridge according to claim 9 , further comprising an urging member configured to urge the process member toward the image bearing member.

11. The cartridge according to claim 10 , wherein the urging member urges both end portions of the process member in the longitudinal direction.

12. The cartridge according to claim 9 , wherein, when the second moving portion abuts on the second maintaining member, the first moving portion does not abut on the first maintaining member.

13. The cartridge according to claim 9 , wherein the process member is a developing roller for bearing a developer.

14. The cartridge according to claim 9 , wherein the process member is a transfer roller to which a toner image on the image bearing member is transferred.