JP2005338775A5

JP2005338775A5 -

Info

Publication number: JP2005338775A5
Application number: JP2005078808A
Authority: JP
Filing date: 2005-03-18
Publication date: 2006-04-20
Anticipated expiration: 2025-03-18

Claims

In the process cartridge detachable from the main body of the electrophotographic image forming apparatus provided with the cam member capable of taking the first position and the second position retracted from the first position,
An electrophotographic photosensitive drum;
A developing roller for developing the electrostatic latent image formed on the electrophotographic photosensitive drum in contact with the electrophotographic photosensitive drum;
A first frame for supporting the electrophotographic photosensitive drum;
A second frame for supporting the developing roller, wherein the second frame is coupled to the first frame so as to be rotatable about an axis; In the mounting direction to be mounted on the apparatus main body, provided on the downstream side of the developing roller,
When the process cartridge, which is provided on one end side of the second frame in the longitudinal direction of the electrophotographic photosensitive drum, is mounted on the apparatus main body, at least a part of the cam member enters in the longitudinal direction. An intrusion portion that is provided downstream of the shaft in the mounting direction; and
When the cam member is positioned at the first position, the cam member receives a force from the cam member that contacts the cam member and separates the electrophotographic photosensitive drum from the developing roller. A cam engagement portion provided on the one end side of the two-frame body, the cam engagement portion provided on the downstream side of the intrusion portion in the mounting direction;
A process cartridge comprising:

2. The distance between a portion where the cam engaging portion receives a force from the cam member and the center of the shaft is longer than a distance between the center of the shaft and the rotation center of the developing roller. The described process cartridge.

When the process cartridge provided on the other end side of the second frame body in the longitudinal direction of the electrophotographic photosensitive drum is mounted on the apparatus main body, a first provided on the apparatus main body in the longitudinal direction. A second intrusion portion into which at least a part of the two cam members enter, a second intrusion portion provided downstream of the shaft in the mounting direction;
The longitudinal direction receives a force from the cam member that contacts the second cam member and separates the electrophotographic photosensitive drum from the developing roller when the second cam member is located at the first position. A second cam engagement portion provided on the other end side of the second frame body, wherein the process
A second cam engagement portion provided on the downstream side of the second intrusion portion in the mounting direction in which the cartridge is mounted on the apparatus main body;
The process cartridge according to claim 1, further comprising:

A straight line connecting a portion where the cam engaging portion receives a force from the cam member and the center of the shaft is positioned above the rotation center of the cam member in a state where the process cartridge is mounted on the apparatus main body. The process cartridge according to any one of claims 1 to 3, wherein

The straight line connecting the portion where the second cam engagement portion receives force from the second cam member and the center of the shaft is the rotation of the second cam member when the process cartridge is mounted on the apparatus main body. The process cartridge according to claim 3, wherein the process cartridge is located above the center.

A developing bias that contacts a main body developing bias contact provided on the apparatus main body on the side surface on one end side of the second frame body in the longitudinal direction of the electrophotographic photosensitive drum to receive the developing bias from the apparatus main body. Have contacts,
6. The process cartridge according to claim 1, wherein the developing bias contact is provided outside the intrusion portion in the longitudinal direction.

The electrophotographic image forming apparatus main body is supported by the one end side and the other end side of the electrophotographic image forming apparatus main body in the longitudinal direction, and supports the cam member and the second cam member. The process cartridge according to claim 1, further comprising a support shaft that is a rotation center of the cam member and the second cam member.

The second frame is a developer storage container that stores a developer for developing the electrostatic latent image, and passes the support shaft in the longitudinal direction on the downstream side in the mounting direction of the process cartridge. 8. The process cartridge according to claim 7, further comprising an allowable developer storage container.

A process cartridge that is attachable to and detachable from a color electrophotographic image forming apparatus main body that can be mounted with a plurality of process cartridges arranged in a vertical direction,
A third intrusion portion provided at an upper portion of the process cartridge on one end side in the longitudinal direction, wherein the color electrophotography in the longitudinal direction when the process cartridge is mounted on the color electrophotographic image forming apparatus main body; A third intrusion portion into which at least a part of another cam member provided in the image forming apparatus main body enters,
The other cam member is in contact with another electrophotographic photosensitive drum included in another process cartridge located above the process cartridge, and the other electrophotographic photosensitive drum is in contact with the other electrophotographic photosensitive drum. Used to contact and separate from other developing rollers for developing the electrostatic latent image formed on the drum,
9. A process cartridge according to claim 1, wherein

A fourth intrusion portion provided on an upper portion of the process cartridge on the other end side in the longitudinal direction, and the color in the longitudinal direction when the process cartridge is mounted on the color electrophotographic image forming apparatus main body. A fourth intrusion portion into which at least a part of the second other cam member provided in the electrophotographic image forming apparatus main body enters,
The second other cam member is in contact with another electrophotographic photosensitive drum included in another process cartridge located above the process cartridge, and the other electrophotographic photosensitive drum, so that the other electronic Used to contact and separate from other developing rollers for developing the electrostatic latent image formed on the photographic photosensitive drum;
The process cartridge according to claim 9.

In an electrophotographic image forming apparatus for detaching a process cartridge and forming an image on a recording medium,
(I) a cam member capable of taking a first position and a second position retracted from the first position;
(Ii) an electrophotographic photosensitive drum;
A developing roller for developing the electrostatic latent image formed on the electrophotographic photosensitive drum in contact with the electrophotographic photosensitive drum;
A first frame for supporting the electrophotographic photosensitive drum;
A second frame for supporting the developing roller, wherein the second frame is coupled to the first frame so as to be rotatable about an axis; In the mounting direction to be mounted on the apparatus main body, provided on the downstream side of the developing roller,
When the process cartridge, which is provided on one end side of the second frame in the longitudinal direction of the electrophotographic photosensitive drum, is mounted on the apparatus main body, at least a part of the cam member enters in the longitudinal direction. An intrusion portion that is provided downstream of the shaft in the mounting direction; and
When the cam member is positioned at the first position, the cam member receives a force from the cam member that contacts the cam member and separates the electrophotographic photosensitive drum from the developing roller. A cam engagement portion provided on the one end side of the two-frame body, the cam engagement portion provided on the downstream side of the intrusion portion in the mounting direction;
Mounting means for detachably mounting a process cartridge having
(Iii) transport means for transporting the recording medium;
An electrophotographic image forming apparatus comprising:

A second cam member capable of taking a first position and a second position retracted from the first position;
In a state where the process cartridge is mounted on the main body of the electrophotographic image forming apparatus, at least a part of the second cam member is on the other end side of the second frame body in the longitudinal direction of the electrophotographic photosensitive drum. Invade the second intrusion provided,
The second cam member is in contact with a second cam engaging portion provided on the other end side of the second frame body in the longitudinal direction of the electrophotographic photosensitive drum at the first position, and A force for separating the photosensitive drum and the developing roller is applied to the second frame.
The electrophotographic image forming apparatus according to claim 11.

The cam member is rotatably provided in the main body of the electrophotographic image forming apparatus,
The rotation center of the cam member is set so that the process cartridge is mounted on the main body of the electrophotographic image forming apparatus, rather than a straight line connecting a portion where the cam engaging portion receives force from the cam member and the center of the shaft. Is provided below,
The electrophotographic image forming apparatus according to claim 11, wherein the electrophotographic image forming apparatus is an image forming apparatus.

At least the rotation center of the cam member is provided upstream of the downstream end of the second frame in the mounting direction in a state where the process cartridge is mounted on the main body of the electrophotographic image forming apparatus. The electrophotographic image forming apparatus according to claim 13.

The second cam member is rotatably provided on the main body of the electrophotographic image forming apparatus,
The rotation center of the second cam member is greater than the straight line connecting the portion where the second cam engagement portion receives a force from the second cam member and the center of the shaft. In the state mounted on the main body of the device, it is provided below,
The electrophotographic image forming apparatus according to claim 12, wherein the electrophotographic image forming apparatus is an image forming apparatus.

At least the rotation center of the second cam member is upstream of the downstream end of the second frame body in the mounting direction when the process cartridge is mounted on the main body of the electrophotographic image forming apparatus. The electrophotographic image forming apparatus according to claim 15, wherein the electrophotographic image forming apparatus is provided.

In the longitudinal direction of the electrophotographic photosensitive drum, it has a support shaft supported by one end side and the other end side of the main body of the electrophotographic image forming apparatus,
The cam member and the second cam member have the support shaft as a rotation center,
The electrophotographic image forming apparatus according to claim 12, wherein the electrophotographic image forming apparatus is an image forming apparatus.

When the process cartridge is mounted on the main body of the electrophotographic image forming apparatus, the support shaft is more than a straight line connecting a portion where the cam engaging portion receives a force from the cam member and the center of the shaft. The lower side, the lower side than the second frame body, and the upstream side of the downstream end of the second frame body in the mounting direction. Electrophotographic image forming apparatus.

A process cartridge that can be attached to and detached from the electrophotographic image forming apparatus main body,
An electrophotographic photosensitive drum;
A developing roller for developing the electrostatic latent image formed on the electrophotographic photosensitive drum in contact with the electrophotographic photosensitive drum;
A cartridge frame,
The upper end of the cartridge frame that is recessed inward in the longitudinal direction at the longitudinal end of the electrophotographic photosensitive drum, the upper part in the vertical direction when the process cartridge is attached to the apparatus main body, and the process An upper recessed portion having an open end on the front end side in a direction in which the cartridge is attached to the apparatus main body;
At the end in the longitudinal direction, there is a lower recess that is recessed inward in the longitudinal direction of the cartridge frame, and the lower part in the vertical direction when the process cartridge is attached to the apparatus main body and the process cartridge is attached to the apparatus main body. A lower recess whose end on the tip side is open in the direction;
Have
A synthetic concave portion formed by a virtual upper concave portion and a lower concave portion when the upper concave portion is moved by a predetermined distance in a predetermined direction allows intrusion of a member acting on the process cartridge provided in the apparatus main body. A process cartridge having a shape like this.

The process cartridge according to claim 19, wherein the member acting on the process cartridge is a cam member.

21. The process cartridge according to claim 19, wherein the predetermined distance is larger than a maximum dimension of the process cartridge in the vertical direction.

A process cartridge attachable to the electrophotographic image forming apparatus main body,
An electrophotographic photosensitive drum;
A developing roller for developing the electrostatic latent image formed on the electrophotographic photosensitive drum in contact with the electrophotographic photosensitive drum;
A cartridge frame,
A first recess recessed inward in the longitudinal direction of the cartridge frame at the longitudinal end of the electrophotographic photosensitive drum, and one end in the horizontal direction when the process cartridge is attached to the apparatus main body And a first recess having an open upper part when the process cartridge is attached to the apparatus main body,
The second end recessed inward in the longitudinal direction of the cartridge frame at the longitudinal end.
A second recess that is open at the other end in the horizontal direction when the process cartridge is attached to the apparatus main body and an upper part when the process cartridge is attached to the apparatus main body. And
A synthetic recess formed by a virtual first recess when the first recess is moved by a predetermined distance in a predetermined direction and a second recess is a member that acts on the process cartridge provided in the apparatus main body. A process cartridge having a shape that allows intrusion.

23. The process cartridge according to claim 22 , wherein the member acting on the process cartridge is a cam member.

The process cartridge according to claim 22 or 23 , wherein the predetermined distance is larger than a maximum dimension of the process cartridge in the horizontal direction.