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: An image forming apparatus has a tray, which is able to be drawn out of the apparatus and on which a plurality of cartridges of different sizes can be mounted. A cartridge, being the largest in size among a plurality of process cartridges, is detachably arranged at a location at which it is first exposed to outside when a cartridge tray is drawn out. A developer storage portion of the largest cartridge has the largest capacity and stores a developer of a black color.

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 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: An image forming apparatus has a tray, which is able to be drawn out of the apparatus and on which a plurality of cartridges of different sizes can be mounted. A cartridge, being the largest in size among a plurality of process cartridges, is detachably arranged at a location at which it is first exposed to outside when a cartridge tray is drawn out. A developer storage portion of the largest cartridge has the largest capacity and stores a developer of a black color.

Abstract: An image forming apparatus has a tray, which is able to be drawn out of the apparatus and on which a plurality of cartridges of different sizes can be mounted. A cartridge, being the largest in size among a plurality of process cartridges, is detachably arranged at a location at which it is first exposed to outside when a cartridge tray is drawn out. A developer storage portion of the largest cartridge has the largest capacity and stores a developer of a black color.

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 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: In an image forming apparatus in which a tray, on which a plurality of cartridges of different sizes can be mounted, is able to be drawn out, a waste of space occurs. A cartridge (50k), being the largest in size among a plurality of process cartridges (50y, 50m, 50c, 50k), is detachably arranged at a location at which it is first exposed to outside when a cartridge tray (13) is drawn out. A developer storage portion having the largest capacity stores a developer of a black color.

Abstract: An electrophotographic photosensitive drum usable with an electrophotographic image forming apparatus, includes a non-circular twisted projection provided at one longitudinal end of the drum, and engageable with a non-circular twisted hole being disposed at a central portion of a driving rotatable member of a main assembly of the image forming apparatus, and an electroconductive member provided on the projection, electrically connected to the drum, and contactable with an electroconductive member electrically connected with a main assembly of the image forming apparatus and disposed in the hole to ground the drum. The contact position between the electroconductive members moves in interrelation with the projection being moved toward the hole by rotation of the driving rotatable member when the projection is engaged with the hole.

Abstract: An electrophotographic photosensitive drum is for a process cartridge detachably mountable to a main assembly of an electrophotographic image forming apparatus. The main assembly includes a motor, and a gear having a non-circular twisted hole. The drum includes a cylinder having a non-circular twisted projection engageable with the hole to receive a driving force from the main assembly when the cartridge is mounted to the main assembly. A recess is formed in the projection and has a bottom portion and a side surface portion. When the projection receives a pulling force toward the hole by rotation of the gear with the projection and the hole being engaged with each other, the bottom portion contacts a spherical surface portion provided at a central portion of the hole, and the side surface portion contacts the spherical surface portion.

Abstract: A developer supply container supplies a developer to a process cartridge detachably mounted to an electrophotographic image forming apparatus. The process cartridge contains an electrophotographic photosensitive drum and a charging member for charging the drum. The developer supply container includes a developer accommodating portion, a developer supply opening for supplying the developer accommodated in the developer accommodating portion to the cartridge, a container closing member for opening and closing the developer supply opening, a first container guide guidable by an apparatus main assembly guide, a second container guide guidable by the main assembly guide, a container force receiving portion for receiving a force for opening the supply opening by movement of the closing member by engagement with a cartridge engaging portion provided in the cartridge, and a first container positioning portion engageable with a first main assembly positioning portion.

Abstract: An electrophotographic photosensitive drum supporting apparatus for rotatably supporting a photosensitive drum includes a first supporting member having a first hole for supporting one end of the drum, and first and second surfaces on one side and the other side of the first supporting member relative to an imaginary plane passing through the axis of the drum, respectively. The first and second surfaces are inclined with respect to the plane so as to contact with the drum and are provided on the inner surface of the first hole. The apparatus also includes a second supporting member having a second hole for supporting the other end of the drum, and a third and a fourth surfaces on one side and the other side of the second supporting member relative to the plane, respectively. The third and fourth surfaces are inclined with respect to the plane so as to contact with the drum and are provided on the inner surface of the second hole.

Abstract: A developing device includes a developer carrying member for carrying a developer to develop an electrostatic image formed on an image bearing member with a developer, wherein an oscillating electric field is formed between the developer carrying member and the image bearing member; a jumping developer blocking member, provided between the image bearing member and the developer carrying member, for blocking a part of a region in which the developer jumps from the developer carrying member to the image bearing member, the jumping developer blocking member including an insulative portion and an electrically floating electroconductive portion opposed to the developer carrying member.

Abstract: A process cartridge detachably mountable to a main assembly of an electrophotographic image forming apparatus, the main assembly including an opening, a door movable between a close position for closing the opening and an open position for opening the opening, a first force application member movable with movement of the door from the open position to the closing position and a second force application member movable by a driving force from a driving source, the process cartridge includes an electrophotographic photosensitive drum; a developing roller for developing an electrostatic latent image formed on the electrophotographic photosensitive drum; a drum unit containing the electrophotographic photosensitive drum; a developing unit which contains the developing roller and which is movable relative to the drum unit such that developing roller is movable between a contact position in which the developing roller is contacted to the electrophotographic photosensitive drum and a spaced position in which the deve

Abstract: An electrophotographic photosensitive drum is for a process cartridge detachably mountable to a main assembly of an electrophotographic image forming apparatus. The main assembly includes a motor, and a gear having a non-circular twisted hole. The drum includes a cylinder having a non-circular twisted projection engageable with the hole to receive a driving force from the main assembly when the cartridge is mounted to the main assembly. A recess is formed in the projection and has a bottom portion and a side surface portion. When the projection receives a pulling force toward the hole by rotation of the gear with the projection and the hole being engaged with each other, the bottom portion contacts a spherical surface portion provided at a central portion of the hole, and the side surface portion contacts the spherical surface portion.

Abstract: An electrophotographic photosensitive drum supporting apparatus for rotatably supporting a photosensitive drum includes a first supporting member having a first hole for supporting one end of the drum, and first and second surfaces on one side and the other side of the first supporting member relative to an imaginary plane passing through the axis of the drum, respectively. The first and second surfaces are inclined with respect to the plane so as to contact with the drum and are provided on the inner surface of the first hole. The apparatus also includes a second supporting member having a second hole for supporting the other end of the drum, and a third and a fourth surfaces on one side and the other side of the second supporting member relative to the plane, respectively. The third and fourth surfaces are inclined with respect to the plane so as to contact with the drum and are provided on the inner surface of the second hole.

Abstract: A developer supply container supplies a developer to a process cartridge detachably mounted to an electrophotographic image forming apparatus. The process cartridge contains an electrophotographic photosensitive drum and a charging member for charging the drum.

Abstract: A process cartridge detachably mountable to an electrophotographic image forming includes an electrophotographic photosensitive drum; a developing roller; a first cartridge positioning portion abuttable to a first main assembly positioning portion provided in a main assembly of the apparatus to position the cartridge with respect to a direction crossing the longitudinal direction, when the cartridge is mounted to the main assembly; a second cartridge positioning portion abuttable to a second main assembly positioning portion provided in the main assembly to limit rotation of the cartridge about the first cartridge positioning portion, when the cartridge receives a rotational driving force for rotating the roller from the main assembly; and a first drive input gear, for engagement with a main assembly driving gear to transmit a rotational driving force to the roller.

Abstract: An electrophotographic photosensitive drum is for a process cartridge detachably mountable to a main assembly of an electrophotographic image forming apparatus. The main assembly includes a motor, and a gear having a non-circular twisted hole. The drum includes a cylinder having a non-circular twisted projection engageable with the hole to receive a driving force from the main assembly when the cartridge is mounted to the main assembly. A recess is formed in the projection and has a bottom portion and a side surface portion. When the projection receives a pulling force toward the hole by rotation of the gear with the projection and the hole being engaged with each other, the bottom portion contacts a spherical surface portion provided at a central portion of the hole, and the side surface portion contacts the spherical surface portion.