Abstract: A cartridge includes a cover member that includes a flat portion, a substantially circular hole portion formed in the flat portion, an arc portion inserted through the hole portion, a first cutaway portion having a shape formed by cutting in the hole portion radially outward, the first cutaway portion arranged in a position opposed to the protrusion portion when viewed in a direction of a rotational axis, and a second cutaway portion having a shape formed by cutting the flat portion toward a photosensitive drum in the direction of the rotational axis to expose a coupling member when viewed in a direction orthogonal to the rotational axis.

Abstract: A cartridge for a main assembly of an electrophotographic image forming apparatus, wherein the main assembly includes a rotatable driving coupling member including a driving force transmitting portion for transmitting a driving force and a driving side abutment, wherein the cartridge is demountable in a direction substantially perpendicular to a rotational axis of the driving coupling member, includes a rotatable driven coupling member including a driving force receiving portion for receiving the driving force, and a driven side abutment to be abutted by the driving side abutment, the driven coupling member being slidable in a predetermined direction which is substantially parallel with a rotational axis of the receiving coupling member; wherein at least one of the driving side abutment and the driven side abutment is inclined so that the driven coupling member is retractable away from the driving coupling member in the predetermined direction by a force received by driven side abutment from the driving side

Abstract: An image forming apparatus in which a cartridge including an erroneous attaching prevention unit and a protruding portion as a holding unit, can be inserted to an attached position. The image forming apparatus includes a frame, an inclined surface on which the protruding portion is placed, the inclined surface being provided to the frame, a guide portion defining with the inclined surface a gap through which the protruding portion is able to pass, and a movable member configured to engage with the erroneous attaching prevention unit on a downstream side of the guide portion in an insertion direction.

Abstract: A cartridge includes a casing and a photosensitive drum rotatably supported in the casing. A rotatable driven coupling member is provided on an axial end of the photosensitive drum, with the driven coupling member including a driving force receiving portion for receiving a driving force to rotate the photosensitive drum. The driven coupling member is translatable with respect to the casing in a predetermined direction, which is substantially parallel to a rotational axis of the photosensitive drum, by a force received by a driven side abutment portion of the driven coupling member. A distance between the rotational axis of the driven coupling member and the driven side abutment portion is not more than a distance between the rotational axis of the driven coupling member and the driving force receiving portion.

Abstract: A cartridge for a main assembly of an electrophotographic image forming apparatus. The cartridge includes a rotatable driven coupling member including a driving force receiving portion for receiving a driving force and a driven side abutment to be abutted by a driving side abutment. The coupling member is slidable in a predetermined direction that is substantially parallel to a rotational axis of the coupling member.

Abstract: A cartridge includes a cover member that includes a flat portion, a substantially circular hole portion formed in the flat portion, an arc portion inserted through the hole portion, a first cutaway portion having a shape formed by cutting in the hole portion radially outward, the first cutaway portion arranged in a position opposed to the protrusion portion when viewed in a direction of a rotational axis, and a second cutaway portion having a shape formed by cutting the flat portion toward a photosensitive drum in the direction of the rotational axis to expose a coupling member when viewed in a direction orthogonal to the rotational axis.

Abstract: A developer container includes: a developer accommodating container for accommodating developer; a feeding member for feeding the developer, the feeding member being rotatable about an axis of a feeding shaft inside the developer accommodating container; and a drive transmission member rotatably mounted to the developer accommodating portion. The feeding shaft and the drive transmission member are bonded to each other at an engaging portion.

Abstract: A cartridge includes a casing and a photosensitive drum rotatably supported in the casing. A rotatable driven coupling member is provided on an axial end of the photosensitive drum, with the driven coupling member including a driving force receiving portion for receiving a driving force to rotate the photosensitive drum. The driven coupling member is translatable with respect to the casing in a predetermined direction, which is substantially parallel to a rotational axis of the photosensitive drum, by a force received by a driven side abutment portion of the driven coupling member. A distance between the rotational axis of the driven coupling member and the driven side abutment portion is not more than a distance between the rotational axis of the driven coupling member and the driving force receiving portion.

Abstract: An image forming apparatus in which a cartridge including an erroneous attaching prevention unit and a protruding portion as a holding unit, can be inserted to an attached position. The image forming apparatus includes a frame, an inclined surface on which the protruding portion is placed, the inclined surface being provided to the frame, a guide portion defining with the inclined surface a gap through which the protruding portion is able to pass, and a movable member configured to engage with the erroneous attaching prevention unit on a downstream side of the guide portion in an insertion direction.

Abstract: A developer container includes: a developer accommodating container for accommodating developer; a feeding member for feeding the developer, the feeding member being rotatable about an axis of a feeding shaft inside the developer accommodating container; and a drive transmission member rotatably mounted to the developer accommodating portion. The feeding shaft and the drive transmission member are bonded to each other at an engaging portion.

Abstract: A process cartridge usable with an electrophotographic image forming apparatus, a main assembly of which is not provided with a mechanism for moving a main assembly side engaging portion provided in the main assembly to transmit a rotational force to an image bearing member in the direction of the rotational axis of the image bearing member by an opening and closing operation of a cover member for the main assembly. The process cartridge can be mounted to the main assembly in a direction substantially perpendicular to the rotational axis of the image bearing member without deterioration of the usability performance. With the process cartridge, the electrophotographic image forming apparatus can be downsized.

Abstract: A cartridge for a main assembly of an electrophotographic image forming apparatus. The cartridge includes a rotatable driven coupling member including a driving force receiving portion for receiving a driving force and a driven side abutment to be abutted by a driving side abutment. The coupling member is slidable in a predetermined direction that is substantially parallel to a rotational axis of the coupling member.

Abstract: A cartridge is provided to be used in a main assembly of an electrophotographic image forming apparatus. The main assembly includes a rotatable driving coupling member including a driving force transmitting portion for transmitting a driving force and a driving side abutment. The cartridge is demountable in a direction substantially perpendicular to a rotational axis of the driving coupling member, and includes a rotatable driven coupling member with a driving force receiving portion for receiving the driving force. The cartridge also includes a driven side abutment to be abutted by the driving side abutment. The driven coupling member is slidable in a predetermined direction that is substantially parallel with a rotational axis of the receiving coupling member.

Abstract: A process cartridge usable with an electrophotographic image forming apparatus, a main assembly of which is not provided with a mechanism for moving a main assembly side engaging portion provided in the main assembly to transmit a rotational force to an image bearing member in the direction of the rotational axis of the image bearing member by an opening and closing operation of a cover member for the main assembly. The process cartridge can be mounted to the main assembly in a direction substantially perpendicular to the rotational axis of the image bearing member without deterioration of the usability performance. With the process cartridge, the electrophotographic image forming apparatus can be downsized.

Abstract: A process cartridge has an electrophotographic photosensitive drum, a charging roller for charging the drum, a spacer movable between a separation position for separating the roller from the drum and a contact position for contacting the roller to the drum, a rotatable receiving gear for receiving a driving force produced by rotation of the drum to move the spacer from the separation position to the contact position, and a rotatable transmission gear engaged with the receiving gear and the spacer to transmit the force from the receiving gear to the spacer to move the spacer from the separation position to the contact position, wherein play is provide in the engagement portion between the receiving gear and the transmission gear so that they can be freely rotated relative to each other by a predetermined angle, whereby the drum is not reversely rotated when the roller is separated from the drum.

Abstract: A cartridge for a main assembly of an electrophotographic image forming apparatus, wherein the main assembly includes a rotatable driving coupling member including a driving force transmitting portion for transmitting a driving force and a driving side abutment, wherein the cartridge is demountable in a direction substantially perpendicular to a rotational axis of the driving coupling member, includes a rotatable driven coupling member including a driving force receiving portion for receiving the driving force, and a driven side abutment to be abutted by the driving side abutment, the driven coupling member being slidable in a predetermined direction which is substantially parallel with a rotational axis of the receiving coupling member; wherein at least one of the driving side abutment and the driven side abutment is inclined so that the driven coupling member is retractable away from the driving coupling member in the predetermined direction by a force received by driven side abutment from the driving side

Abstract: A developing apparatus for an image forming apparatus includes a magnetic sealing member having an arcuate surface and having a magnetic property, and which is opposed to an outer surface of a developing roller with a gap therebetween and a projected surface having a magnetic property projected from an upstream end of the arcuate surface toward upstream with respect to a peripheral moving direction of the developing roller, and which is more remote from an outer surface of the developing roller than the arcuate surface; and a sheet for preventing the magnetic developer from leaking between the developing device frame and the developing roller. The sheet is mounted to an upstream end of a developing device frame with respect to the moving direction and contacted to the developing roller so as to cover at least a part of the projected surface.

Abstract: A developing apparatus for an image forming apparatus includes a developing roller for carrying a magnetic developer; a developing device frame, having an opening for exposing a part of the developing roller, for rotatably supporting the developing roller; a magnetic sealing member, mounted to the developing device frame at a longitudinal end portion, for sealing a gap between the developing device frame and the developing roller against leakage of the magnetic developer, wherein the magnetic sealing member includes an arcuate surface which has a magnetic property and which is opposed to an outer surface of the developing roller with a gap therebetween and a projected surface which has a magnetic property and which is projected from an upstream end of the arcuate surface toward upstream with respect to a peripheral moving direction of the developing roller and which is remoter from an outer surface of the developing roller than the arcuate surface; a sheet for preventing the magnetic developer from leaking th