According to a first aspect of the present invention, there is provided a toner cartridge detachably mountable to a receiving device, the toner cartridge comprising a container including a accommodating portion for accommodating the toner and a discharge opening for discharging the toner from the accommodating portion into the receiving device; and an open/close member including a closing portion for closing the discharge opening and an engaging portion movable relative to the closing portion, the open/close member being rotatable relative to the container between (a) an opening position for causing the closing portion to open the discharge opening and (b) a closing position for causing the closing portion to close the discharge opening, wherein the engaging portion is movable relative to the closing portion between (c) a engaging position for engagement with the receiving device to receive a force for moving the open/close member from the opening position to the closing position when the toner cartridge is dismounted from the receiving device and (d) a retracted position retracted from the engaging position, and wherein the engaging portion is movable from the retracted position to the engaging position with rotation of the open/close member from the closing position to the opening position.

According to a first aspect of the present invention, there is provided a toner cartridge detachably mountable to a receiving device, the toner cartridge comprising a container including a accommodating portion for accommodating the toner and a discharge opening for discharging the toner from the accommodating portion into the receiving device; and an open/close member including a closing portion for closing the discharge opening and an engaging portion movable relative to the closing portion, the open/close member being rotatable relative to the container between (a) an opening position for causing the closing portion to open the discharge opening and (b) a closing position for causing the closing portion to close the discharge opening, wherein the engaging portion is movable relative to the closing portion between (c) a engaging position for engagement with the receiving device to receive a force for moving the open/close member from the opening position to the closing position when the toner cartridge is dismounted from the receiving device and (d) a retracted position retracted from the engaging position, and wherein the engaging portion is movable from the retracted position to the engaging position with rotation of the open/close member from the closing position to the opening position.

An image forming apparatus includes an apparatus main body; a moving unit movable between a first position where the moving unit is inside the apparatus main body and a second position where the moving unit is outside the apparatus main body, the moving unit including an image bearing member, a cleaning member, a conveying member conveying removed toner from the image bearing member, and an outlet disposed at a first end of the moving unit and through which the removed toner is discharged outside the moving unit; a processing unit acting on the image bearing member; and a contact disposed at a second end of the moving unit opposite the first end and through which the processing unit receives power. The apparatus main body includes a container accommodating the removed toner, having an inlet for receiving the removed toner from the outlet.

An image forming unit includes an image carrier, a body, a shutter unit, a first guiding portion, and a holding portion. The body holds the image carrier with a portion of the image carrying surface being exposed. The shutter unit includes first and second shutter members. The first shutter member is held by the body, being pivotable about a first rotational axis relative to the body, and includes a first inner surface. The second shutter member is held by the first shutter member, being pivotable about a second rotational axis relative to the first shutter member, and includes a second inner surface and first and second contact portions. The shutter unit is shiftable between a closed state and an open state. The closed state is a state extended with the image carrying surface being covered. The open state is a state with the image carrying surface being exposed.

A cartridge detachably mountable to a main assembly of an image forming apparatus includes a photosensitive drum; a discharging path for permitting movement of a developer removed from the drum, the discharging path including a developer discharge opening and a movable portion through which the developer is movable and which is movable between a retracted position in an upstream side with respect to a developer moving direction through the discharge opening and a advanced position in a downstream side with respect to the developer moving direction; and a sealing portion for closing the discharging path by contacting the movable portion at a position different from that of the discharge opening.

A cartridge includes a cartridge frame member including a developer accommodation portion, an image bearing member rotatably provided to the cartridge frame member, an end sealing provided to the cartridge frame member and abutting on an end of the image bearing member in a longitudinal direction, a cleaning unit for acting on the image bearing member, a sealing portion integrally provided with the cartridge frame member and abut on an end of the cleaning unit in the longitudinal direction, a sheet member provided along the longitudinal direction and abut on the image bearing member at an end of the sheet member in a direction that crosses the longitudinal direction, and a fixing portion for fixing the sheet member and the cartridge frame member. The sealing portion and the fixing portion are integrally formed with the cartridge frame member.

Disclosed is a development cartridge detachable from a main body of an image forming apparatus. The development cartridge includes a lateral waste toner sealing member contacting an end portion of a photosensitive drum in a lengthwise direction of the photosensitive drum to prevent a waste toner from leaking through the end portion of the photosensitive drum, and a photosensitive frame including a waste toner container to contain the waste toner, a first attachment surface, to which the lateral waste toner sealing member is attached, and a side wall to form a boundary at an upstream side of the first attachment surface with respect to a rotation direction of the photosensitive drum. The lateral waste toner sealing member includes an opposite surface facing the side wall, and a protrusion protruding towards the side wall is provided on the opposite surface.

A cartridge detachably mountable to a main assembly of an image forming apparatus includes a photosensitive member unit including a photosensitive drum; a sheet configured to remove a deposited matter from a surface of the drum, the sheet being in contact with the surface of the drum at an end portion of the drum with respect to a rotational axis direction of the member; and a developing unit detachably mounted to the member unit, the developing unit including a developing roller configured to supply toner to the drum, and a storage portion configured to store the deposited matter removed from the surface of the drum by the sheet.

A cleaning device, including: a cleaning frame; a cleaning member having one end and the other end, the image bearing member being capable of rotating and bearing a developer image formed of a developer so as to remove the developer remaining on the image bearing member after transfer of the developer image from the image bearing member; and a sheet member having flexibility and having one end and the other end; wherein a work function W (D) of the developer and a work function W (S) of the sheet member satisfy 0W(D)W(S)0.23 and the developer includes inorganic particles, and at least one kind of the inorganic particles has an average primary particle diameter of 50 nm or larger.

A developer container includes a developer accommodating portion, a rotatable member, and a flexible sheet member. The developer container further includes an elastically deformable elastic member. With respect to a longitudinal direction of the developer accommodating portion, between an end portion of the rotatable member and an inside surface of the developer accommodating portion, a gap is formed to permit movement of the rotatable member relative to the developer accommodating portion. In an unused state, the sheet member is elastically deformable together with the elastic member by the movement of the rotatable member relative to the developer accommodating portion in the longitudinal direction.