Abstract: A process cartridge is detachably mountable to a main assembly of an electrophotographic image forming apparatus. The cartridge includes an electrophotographic photosensitive drum, a developing roller, a drum unit containing the drum, a developing unit containing the roller and being movable so the roller contacts and is spaced from the drum, and a first force receiver receiving a force from a main-assembly first force applier by movement of a door from open to closed positions when mounting the cartridge and a second force receiver movable from a stand-by position by movement of the first force receiver by a force received from the first force applier. The second force receiver takes a projected position receiving a force from the second force applier to move the developing unit so the roller moves out of contact with the drum, the projected position being higher than the stand-by position.

Abstract: A developing device includes a developing container, provided with an opening, for containing a developer; a developing roller, provided at the opening, for forming a developer image on an image bearing member; a seal member, provided at the opening along an end portion of the developing roller, for preventing toner leakage from a gap between the opening and the developing roller; and a developer supplying roller, including a core material and a cylindrical elastic member which is provided around the core material and is contacted to the developing roller, for supplying the developer to the developing roller. The cylindrical elastic member has an end surface and a central portion with respect to a longitudinal direction thereof. The end surface has an outer diameter larger than that of the central portion so as to be in non-contact with the seal member.

Abstract: A cleaning unit including: frame abutment portions each including a first abutment portion and a second abutment portion; support portions each including a first support portion which abuts against the first abutment portion, and a second support portion which abuts against the second abutment portion so as to support a cleaning member in a pivotable manner about the frame abutment portions as a pivot axis; and an urging member configured to urge the cleaning member in a direction in which an elastic member is brought into contact with a photosensitive drum by pivoting the cleaning member.

Abstract: A process cartridge detachably mountable to a main assembly of an image forming apparatus. The process cartridge includes a photosensitive member unit including an electrophotographic photosensitive member, and a developing unit including a developing roller for developing an electrostatic latent image formed on the photosensitive member, the developing unit being movable between a contact position in which the developing roller is contacted to the photosensitive member and a separated position in which the developing roller is separated from the photosensitive member. The process cartridge also includes a drive transmitting portion for transmitting a driving force for driving the developing roller at one longitudinal end side of the developing unit. The drive transmitting portion provides to the developing unit a force for moving the developing unit in a direction from the separated position toward the contact position by receiving the driving force.

Abstract: A process cartridge detachably mountable to a main assembly of an electrophotographic image forming apparatus, includes an electrophotographic photosensitive drum, a developing roller, a drum frame, a movable developing frame taking a position where the roller contacts the drum, and a force receiver having first and second force receivers for receiving first and second external forces. The second force receiver moves relative to the developing frame. The second force receiver takes a stand-by position retracted from an operating position when the first force receiver receives the first external force, and moves from the stand-by to the operating position for moving the developing frame from the contacting position to the spacing position. The distance the second force receiver moves from the stand-by to the operating position is larger than the distance the first force receiver moves by the first external force.

Abstract: A process cartridge includes an electrophotographic photosensitive drum and a frame for supporting the electrophotographic photosensitive drum. The process cartridge also includes a first portion-to-be-positioned for being positioned to a first main assembly side positioning portion provided in the main assembly of an apparatus, a second portion-to-be-positioned for being positioned to a second main assembly side positioning portion provided in the main assembly of the apparatus, and a longitudinal positioning portion to be positioned by a main assembly side longitudinal positioning portion provided in the main assembly of the apparatus. The apparatus still further includes a portion-to-be-urged for receiving an inclined downward elastic force of a first main assembly side elastic member provided in the main assembly of the apparatus to urge the longitudinal positioning portion and the second portion-to-be-positioned.

Abstract: A process cartridge detachably is mountable to a main assembly of the apparatus of an image forming apparatus including an urging member and a positioning portion. The cartridge includes a photosensitive drum; a positionable portion positioning the cartridge by engaging the positioning portion when the cartridge is mounted to the apparatus; first and second urgable portions being urged respectively, by first and second urging portions of the urging member to urge the positionable portion to the positioning portion during cartridge mounting; and an electrical contact, provided between the first and second urgable portions with respect to a horizontal direction crossing an axis of the drum, for connecting electrically to an electrical contact portion in the urging member, when the cartridge is mounted to the apparatus.

Abstract: A process cartridge is detachably mountable to a main assembly of an electrophotographic image forming apparatus. The cartridge includes an electrophotographic photosensitive drum, a developing roller, a drum unit containing the drum, a developing unit containing the roller and being movable so the roller contacts and is spaced from the drum, and a first force receiver receiving a force from a main-assembly first force applier by movement of a door from open to closed positions when mounting the cartridge and a second force receiver movable from a stand-by position by movement of the first force receiver by a force received from the first force applier. The second force receiver takes a projected position receiving a force from the second force applier to move the developing unit so the roller moves out of contact with the drum, the projected position being higher than the stand-by position.

Abstract: A process cartridge detachably mountable to a main assembly of an electrophotographic image forming apparatus, includes an electrophotographic photosensitive drum, a developing roller, a drum frame, a movable developing frame taking a position where the roller contacts the drum, and a force receiver having first and second force receivers for receiving first and second external forces. The second force receiver moves relative to the developing frame. The second force receiver takes a stand-by position retracted from an operating position when the first force receiver receives the first external force, and moves from the stand-by to the operating position for moving the developing frame from the contacting position to the spacing position. The distance the second force receiver moves from the stand-by to the operating position is larger than the distance the first force receiver moves by the first external force.

Abstract: A process cartridge includes an electrophotographic photosensitive drum and a developing roller that is movable between a contacting position in which the developing roller is in contact with the electrophotographic photosensitive drum and a spaced position in which the developing roller is spaced from the electrophotographic photosensitive drum. The apparatus further includes a spacing force receiving portion that is movable between a projected position and a retracted position, and a projecting force receiving portion that receives an external force to move the spacing force receiving portion from the retracted position to the projected position.

Abstract: A process cartridge is detachably mountable to a main assembly of an electrophotographic image forming apparatus. The cartridge includes an electrophotographic photosensitive drum, a developing roller, a drum unit containing the drum, a developing unit containing the roller and being movable so the roller contacts and is spaced from the drum, and a first force receiver receiving a force from a main assembly first force applier by movement of a door from open to closed positions when mounting the cartridge and a second force receiver movable from a stand-by position by movement of the first force receiver by a force received from the first force applier. The second force receiver takes a projected position receiving a force from the second force applier to move the developing unit so the roller moves out of contact with the drum, the projected position being higher than the stand-by position.

Abstract: A process cartridge is provided detachably mountable to a main assembly of an electrophotographic image forming apparatus. The process cartridge includes an electrophotographic photosensitive drum, a frame for supporting the electrophotographic photosensitive drum, a developing roller, and a developer supplying roller. The process cartridge further includes portions-to-be-supported, portions-to-be-positioned, a portion-to-be-urged, and a cartridge side developer supply roller bias contact. The process cartridge can be positioned with high accuracy relative to the main assembly of an image forming apparatus.

Abstract: A process cartridge detachably mountable to a main assembly of an image forming apparatus includes a photosensitive member unit including an electrophotographic photosensitive member; developing unit, including a developing roller for developing an electrostatic latent image formed on the photosensitive member, movable between a contact position in which the developing roller is contacted to the photosensitive member and a separated position in which the developing roller is separated from the photosensitive member; a drive transmitting portion for transmitting a driving force for driving the developing roller at one longitudinal end side of the developing unit, wherein the drive transmitting portion provides, to the developing unit, a force for moving the developing unit in a direction from the separated position toward the contact position by receiving the driving force; an urging member for urging, at the other longitudinal end side of the developing unit, the developing unit so that the developing unit is

Abstract: A developer layer thickness regulating device includes a blade member for regulating a thickness of a layer of a developer on a surface of a developing roller rotatably supported by a developing container for accommodating the developer and includes a supporting member for supporting the blade member. The supporting member is capable of being fastened to a part of the developing container by a fastening member, and a position of the supporting member relative to a part of the developer container is adjustable with respect to a widthwise direction of the blade member, when the supporting member is fastened to the developing container by the fastening member, so as to fasten the blade member at a predetermined position relative to the developing container. The supporting member has a biting portion which is capable of biting into the part of the developing container when the supporting member is fastened by the fastening member.

Abstract: A process cartridge detachably is mountable to a main assembly of the apparatus of an image forming apparatus including an urging member and a positioning portion. The cartridge includes a photosensitive drum; a positionable portion positioning the cartridge by engaging the positioning portion when the cartridge is mounted to the apparatus; first and second urgable portions being urged respectively, by first and second urging portions of the urging member to urge the positionable portion to the positioning portion during cartridge mounting; and an electrical contact, provided between the first and second urgable portions with respect to a horizontal direction crossing an axis of the drum, for connecting electrically to an electrical contact portion in the urging member, when the cartridge is mounted to the apparatus.

Abstract: A developing device includes a developing container, provided with an opening, for containing a developer; a developing roller, provided at the opening, for forming a developer image on an image bearing member; a seal member, provided at the opening along an end portion of the developing roller, for preventing toner leakage from a gap between the opening and the developing roller; and a developer supplying roller, including a core material and a cylindrical elastic member which is provided around the core material and is contacted to the developing roller, for supplying the developer to the developing roller. The cylindrical elastic member has an end surface and a central portion with respect to a longitudinal direction thereof. The end surface has an outer diameter larger than that of the central portion so as to be in non-contact with the seal member.

Abstract: A process cartridge detachably is mountable to a main assembly of the apparatus of an image forming apparatus including an urging member and a positioning portion. The cartridge includes a photosensitive drum; a positionable portion positioning the cartridge by engaging the positioning portion when the cartridge is mounted to the apparatus; first and second urgable portions being urged respectively, by first and second urging portions of the urging member to urge the positionable portion to the positioning portion during cartridge mounting; and an electrical contact, provided between the first and second urgable portions with respect to a horizontal direction crossing an axis of the drum, for connecting electrically to an electrical contact portion in the urging member, when the cartridge is mounted to the apparatus.

Abstract: A process cartridge includes an electrophotographic photosensitive drum and a frame for supporting the electrophotographic photosensitive drum. The process cartridge also includes a first portion-to-be-positioned for being positioned to a first main assembly side positioning portion provided in the main assembly of an apparatus, a second portion-to-be-positioned for being positioned to a second main assembly side positioning portion provided in the main assembly of the apparatus, and a longitudinal positioning portion to be positioned by a main assembly side longitudinal positioning portion provided in the main assembly of the apparatus. The apparatus still further includes a portion-to-be-urged for receiving an inclined downward elastic force of a first main assembly side elastic member provided in the main assembly of the apparatus to urge the longitudinal positioning portion and the second portion-to-be-positioned.

Abstract: A process cartridge is provided detachably mountable to a main assembly of an electrophotographic image forming apparatus. The process cartridge includes an electrophotographic photosensitive drum, a frame for supporting the electrophotographic photosensitive drum, a developing roller, and a developer supplying roller. The process cartridge further includes portions-to-be-supported, portions-to-be-positioned, a portion-to-be-urged, and a cartridge side developer supply roller bias contact. The process cartridge can be positioned with high accuracy relative to the main assembly of an image forming apparatus.

Abstract: A process cartridge is detachably mountable to a main assembly of an electrophotographic image forming apparatus. The cartridge includes an electrophotographic photosensitive drum, a developing roller, a drum unit containing the drum, a developing unit containing the roller and being movable so the roller contacts and is spaced from the drum, and a first force receiver receiving a force from a main assembly first force applier by movement of a door from open to closed positions when mounting the cartridge and a second force receiver movable from a stand-by position by movement of the first force receiver by a force received from the first force applier. The second force receiver takes a projected position receiving a force from the second force applier to move the developing unit so the roller moves out of contact with the drum, the projected position being higher than the stand-by position.