JP2011048399A5

JP2011048399A5 -

Info

Publication number: JP2011048399A5
Application number: JP2010272355A
Authority: JP
Filing date: 2010-12-07
Publication date: 2011-04-21
Anticipated expiration: 2027-10-03

Claims

A process cartridge that is detachable from an electrophotographic image forming apparatus main body having a drive member,
A photosensitive drum;
A developing roller that develops the electrostatic image formed on the photosensitive drum at a position in contact with the photosensitive drum, the developing position being in contact with the photosensitive drum, and a standby position spaced apart from the photosensitive drum; A developing roller movable in a direction crossing the axis of the developing roller so as to be able to be taken;
A coupling member provided on one end side in the axial direction of the developing roller and capable of receiving a driving force for rotating the developing roller from the driving member, and maintaining the engagement with the driving member; A coupling member having an engaging portion that allows the developing roller to move from the developing position to the standby position;
When the developing roller is in a state of being separated from the photosensitive drum, the engaging portion can be engaged with the driving member along with the operation of inserting the process cartridge into the apparatus main body. An urging portion for urging the engaging portion in a direction crossing the axis of the developing roller;
A process cartridge comprising:

2. The process cartridge according to claim 1, further comprising an abutting portion against which the engaging portion urged by the urging portion abuts.

When the developing roller is located at the standby position, the abutting portion has a distance between the axis of the photosensitive drum and the axis of the engaging portion between the axis of the photosensitive drum and the axis of the developing roller. The process cartridge according to claim 2, wherein the process cartridge is disposed so as to be shorter than the distance.

4. The process cartridge according to claim 2, wherein the abutting portion is provided in a bearing portion that rotatably supports the photosensitive drum.

5. The process cartridge according to claim 4, further comprising a positioning portion that is provided on the bearing portion and positions the photosensitive drum by contacting a main body positioning portion of the apparatus main body.

An urging member that urges the developing roller so that the developing roller comes into contact with the photosensitive drum, and an urging force of the urging member that maintains the state where the developing roller is separated from the photosensitive drum. And a lock portion for locking the position of the developing roller with respect to the photosensitive drum.
The process cartridge according to claim 1, wherein the lock portion is configured to be unlocked in accordance with an operation of inserting the process cartridge into the apparatus main body.

7. The process cartridge according to claim 6, further comprising a force receiving portion that receives, from the apparatus main body, a force for separating the developing roller from the photosensitive drum when the lock portion is unlocked.

The process cartridge according to claim 1, wherein the urging portion is an elastic body.

The coupling member is positioned between a fixed-side engaging portion fixed to the developing roller, and the engaging portion and the fixed-side engaging portion between the engaging portion and the fixed-side engaging portion. The process cartridge according to any one of claims 1 to 8, wherein the process cartridge is an Oldham coupling including an intermediate engaging portion that allows movement while maintaining the engagement.

The process cartridge according to claim 1, wherein the photosensitive drum and the developing roller are configured to receive a driving force from the apparatus main body independently of each other.

11. The process according to claim 1, further comprising a drum coupling member provided on one end side in the axial direction of the photosensitive drum and capable of receiving a driving force for rotating the photosensitive drum. cartridge.

The developing roller is integrated as a developing unit together with a developer container containing developer, and the photosensitive drum is integrated as a drum unit together with a charging roller for charging the photosensitive drum and a cleaning member for cleaning the photosensitive drum. 12. The process cartridge according to claim 1, wherein the developing unit is coupled to the drum unit so as to be rotatable with respect to the drum unit.

The process cartridge according to claim 1, wherein the process cartridge is configured to be inserted into the apparatus main body along an axial direction of the developing roller.

In an electrophotographic image forming apparatus for forming an image on a recording medium,
(A) a process cartridge detachably attached to an electrophotographic image forming apparatus main body having a driving member,
A photosensitive drum;
A developing roller that develops the electrostatic image formed on the photosensitive drum at a position in contact with the photosensitive drum, the developing position being in contact with the photosensitive drum, and a standby position spaced apart from the photosensitive drum; A developing roller movable in a direction crossing the axis of the developing roller so as to be able to be taken;
A coupling member provided on one end side in the axial direction of the developing roller and capable of receiving a driving force for rotating the developing roller from the driving member, and maintaining the engagement with the driving member; A coupling member having an engaging portion that allows the developing roller to move from the developing position to the standby position;
When the developing roller is in a state of being separated from the photosensitive drum, the engaging portion can be engaged with the driving member along with the operation of inserting the process cartridge into the apparatus main body. An urging portion for urging the engaging portion in a direction crossing the axis of the developing roller;
A process cartridge having
(B) conveying means for conveying the recording medium;
An electrophotographic image forming apparatus comprising: