Abstract: An image forming apparatus includes a main assembly to which a cartridge is detachably mountable. The cartridge includes an image bearing member and a supporting member. The cartridge is mountable to the main assembly in the direction of the axis of the image bearing member. An opening is provided in the main assembly for receiving the supporting member and for positioning or regulating the supporting member, with the opening having a V-shaped portion. An urging member is provided for urging the supporting member in a direction that is substantially perpendicular to the axis of the image bearing member.

Abstract: A controller sets a pressure-contact time from memory in accordance with rigidity of a sheet and starts a feeding operation of a sheet by causing a feeding roller to be pressure contacted with sheets on a sheet stacking plate. The controller controls the feeding roller to be separated from the sheets on the sheet stacking plate after passage of the pressure-contact time. In this way, it is possible to set the optimum pressure-contact time at the time of feeding sheets in accordance with the kind of sheet being fed and realize a stable feeding operation. Since the controller controls a driving unit based on a detection signal of a sheet-surface detecting flag that detects the height of the uppermost surface of a sheet bundle, it is possible to realize the stabilization and acceleration of a contacting operation.

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 and a process device actable on the drum. The process cartridge also includes a cartridge positioning portion for engaging a main assembly positioning portion to position the cartridge with respect to a direction crossing the direction of the axis of the drum when the cartridge is mounted to the main assembly in a direction parallel with the axis of the photosensitive drum. Further, a movable member is provided movable between a first position contacting the main assembly in the process of mounting of the cartridge to the main assembly, and a second position contacting a main assembly urging member and receiving a force in the crossing direction to contact the cartridge positioning portion to the main assembly positioning portion to position the cartridge in the crossing direction.

Abstract: A process cartridge detachably mountable to a main assembly of an electrophotographic image forming apparatus including an electrophotographic photosensitive drum, a process device actable on the drum, a cartridge positioning portion for engaging a main assembly positioning portion to position the cartridge with respect to a direction crossing the direction of the axis of the drum when the cartridge is mounted to the main assembly in a direction parallel with the axis of the photosensitive drum, and a movable member movable between a first position contacting the main assembly in the process of mounting of the cartridge to the main assembly, and a second position contacting a main assembly urging member and receiving a force in the crossing direction to contact the cartridge positioning portion to the main assembly positioning portion to position the cartridge in the crossing direction, when the cartridge is mounted to the main assembly.

Abstract: A controller sets a pressure-contact time from memory in accordance with rigidity of a sheet and starts a feeding operation of a sheet by causing a feeding roller to be pressure contacted with sheets on a sheet stacking plate. The controller controls the feeding roller to be separated from the sheets on the sheet stacking plate after passage of the pressure-contact time. In this way, it is possible to set the optimum pressure-contact time at the time of feeding sheets in accordance with the kind of sheet being fed and realize a stable feeding operation. Since the controller controls a driving unit based on a detection signal of a sheet-surface detecting flag that detects the height of the uppermost surface of a sheet bundle, it is possible to realize the stabilization and acceleration of a contacting operation.

Abstract: A process cartridge detachably mountable to a main assembly of an electrophotographic image forming apparatus including an electrophotographic photosensitive drum, a process device actable on the drum, a cartridge positioning portion for engaging a main assembly positioning portion to position the cartridge with respect to a direction crossing the direction of the axis of the drum when the cartridge is mounted to the main assembly in a direction parallel with the axis of the photosensitive drum, and a movable member movable between a first position contacting the main assembly in the process of mounting of the cartridge to the main assembly, and a second position contacting a main assembly urging member and receiving a force in the crossing direction to contact the cartridge positioning portion to the main assembly positioning portion to position the cartridge in the crossing direction, when the cartridge is mounted to the main assembly.

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 process device actable on the drum, a cartridge positioning portion for engaging a main assembly positioning portion to position the cartridge with respect to a direction crossing the direction of the axis of the drum when the cartridge is mounted to the main assembly in a direction parallel with the axis of the photosensitive drum, and a movable member movable between a first position contacting the main assembly in the process of mounting of the cartridge to the main assembly, and a second position contacting a main assembly urging member and receiving a force in the crossing direction to contact the cartridge positioning portion to the main assembly positioning portion to position the cartridge in the crossing direction, when the cartridge is mounted to the main assembly.

Abstract: A process cartridge detachably mountable to a main assembly of an electrophotographic image forming apparatus including an electrophotographic photosensitive drum, a process device actable on the drum, a cartridge positioning portion for engaging a main assembly positioning portion to position the cartridge with respect to a direction crossing the direction of the axis of the drum when the cartridge is mounted to the main assembly in a direction parallel with the axis of the photosensitive drum, and a movable member movable between a first position contacting the main assembly in the process of mounting of the cartridge to the main assembly, and a second position contacting a main assembly urging member and receiving a force in the crossing direction to contact the cartridge positioning portion to the main assembly positioning portion to position the cartridge in the crossing direction, when the cartridge is mounted to the main assembly.

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 process device actable on the drum, a cartridge positioning portion for engaging a main assembly positioning portion to position the cartridge with respect to a direction crossing the direction of the axis of the drum when the cartridge is mounted to the main assembly in a direction parallel with the axis of the photosensitive drum, and a movable member movable between a first position contacting the main assembly in the process of mounting of the cartridge to the main assembly, and a second position contacting a main assembly urging member and receiving a force in the crossing direction to contact the cartridge positioning portion to the main assembly positioning portion to position the cartridge in the crossing direction, when the cartridge is mounted to the main assembly.

Abstract: A process cartridge detachably mountable to a main assembly of an electrophotographic image forming apparatus including an electrophotographic photosensitive drum, a process device actable on the drum, a cartridge positioning portion for engaging a main assembly positioning portion to position the cartridge with respect to a direction crossing the direction of the axis of the drum when the cartridge is mounted to the main assembly in a direction parallel with the axis of the photosensitive drum, and a movable member movable between a first position contacting the main assembly in the process of mounting of the cartridge to the main assembly, and a second position contacting a main assembly urging member and receiving a force in the crossing direction to contact the cartridge positioning portion to the main assembly positioning portion to position the cartridge in the crossing direction, when the cartridge is mounted to the main assembly.

Abstract: A process cartridge detachably mountable to a main assembly of an electrophotographic image forming apparatus, includes an electrophotographic photosensitive drum; process means actable on the drum; a cartridge positioning portion for engagement with a main assembly positioning portion provided in the main assembly to position the cartridge with respect to a direction crossing with the direction of the axis of the drum, when the cartridge is mounted to the main assembly in a direction parallel with the axis of the photosensitive drum; and a movable member provided at a downstream position with respect to a mounting direction in which the cartridge is mounted to the main assembly, the movable member is movable between a first position at which the movable member contacts the main assembly in the mounting direction in the process of mounting of the cartridge to the main assembly, and a second position in which the movable member is contacted by an urging member provided in the main assembly and receives a force