A cartridge includes a photosensitive drum, the movable member movable relative to the photosensitive drum to control an inclination angle of a drive transmission member. The movable member is movable between a first position for reducing an inclination angle of the drive transmission member relative to the photosensitive drum and a second position retracted from the first position. By this, driving connection can be smoothly carried out.

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.

A cartridge includes a photosensitive drum, a developing roller, and a casing rotatably supporting the photosensitive drum and the developing roller. The casing includes a groove open to outside of the casing. The casing also includes first and second projected parts that project from the first end portion of the casing in the direction of a rotational axis of the photosensitive drum and away from the photosensitive drum. As seen in the direction of the rotational axis of the photosensitive drum, the rotational axis of the photosensitive drum and the groove are positioned along a line in the extended direction, with the first projected part being positioned on one side of the line and the second projected part being positioned on the other side of the line. A first end of the groove and a second end of the groove are open such that the groove forms a channel in the casing along the extended direction.

A driving force transmission mechanism is a mechanism for transmitting rotational force of the second rotor having a driving-side coupling to a first rotor having a driven-side coupling. The driving-side coupling includes a body and a plurality of second engaging members engaging with first engaging members of the driven-side coupling, each of the plurality of second engaging members has at an abutting point on an abutting surface of a corresponding first engaging member a first inclined surface inclined so as to be away from a rotation axis of the body from a downstream side toward an upstream side in a rotation direction of the body.

An image forming apparatus includes a main body provided with a mounting portion and an interference member, and a toner cartridge inserted into the mounting portion. The toner cartridge includes a housing containing toner, a coupling portion, a front cover coupled to one end of the housing via the coupling portion, and a switching member to weaken a coupling force of the coupling portion by interfering with the interference member when the toner cartridge is mounted on the mounting portion.

An image forming apparatus, having a first photosensitive drum, a first developing roller, a first shifting member movable between a contacting position and a separating position, a motor, a first joint, a first clutch operable in one of a transmittable condition and a discontinuing condition, a first shifting cam rotatable between a first position, in which the first shifting cam locates the first shifting member at the contacting position, and a second position, in which the first shifting cam locates the first shifting member at the separating position, and a first switching cam rotatable between a third position, in which the first switching cam places the first clutch in the transmittable condition, and a fourth position, in which the first switching cam places the first clutch in the discontinuing condition, alongside the first shifting cam rotating between the first position and the second position, is provided.

An image forming apparatus includes a photosensitive drum, a photoreceptor housing, a developing roller, a development housing, first contact members and second contact members. The first contact members are provided in end portions of the photoreceptor housing in an axial direction of the photosensitive drum. The second contact members are provided in end portions of the development housing in the axial direction, and come into contact with the first contact members by a force in which the development housing is pushed toward the photoreceptor housing. A position of at least one of the first contact member and the second contact member can be adjusted in a direction in which the first contact member and the second contact member come close to each other or separate away from each other.

An example device can include a reserve print materials container, an access port coupled to the reserve print materials container to receive, from a replenishment device, print materials directly to the reserve print materials container in-situ, and a main print materials container coupled to the reserve print materials container to receive print materials from the reserve print materials container.

A developing cartridge may include: a casing for accommodating developer therein; a developing roller rotatable about an axis extending in a first direction and positioned at one side of the casing in a second direction; a storage medium having an electric contact surface; and a holder movable relative to the casing in the second direction with the electric contact surface between a first position and a second position, the holder having an outer surface at which the electric contact surface is positioned.

In a toner container, a powder container that includes a container body configured to store toner, and is rotated by input of rotational drive of a drive output section of an image forming device while being set in the image forming device, the toner container includes an incompatible hole group, as a container-side engagement portion, on a front end surface facing downstream in an insertion direction when inserted in a direction parallel to a rotational center line of the rotational drive and set in the image forming device, the incompatible hole group has a hole shape that is engaged with a body-side projection portion of the drive output section protruding upstream in the insertion direction, and the rotational drive is input by rotation of the drive output section with the incompatible hole group and the body-side projection portion engaged with each other.