A sealing assembly according to one example embodiment includes a housing and an imaging component positioned on the housing. A seal has opposed first and second edges extending along a longitudinal dimension of the seal. A lateral dimension of the seal is perpendicular to the longitudinal dimension and extends in a direction from the first edge to the second edge. The seal is attached to the housing along the first edge and contacts the imaging component along the second edge. Upon attachment to the housing, the seal is elastically deformed from an unassembled state in which the second edge has a first profile that varies in the lateral dimension along the longitudinal dimension to an assembled state in which the second edge is deformed relative to the first profile to a second profile having less variation in the lateral dimension along the longitudinal dimension than the first profile.

A toner cartridge includes a housing to contain toner and comprising a toner outlet adjacent to a front end in a longitudinal direction; a front cover coupled to the front end of the housing; a first coupling portion to couple the front cover to the housing based on a coupling force of the first coupling portion; and a shutter movable between an open position and a closed position to open and close the toner outlet, and to weaken the elastic coupling force of the first coupling portion when the shutter is moved from the closed position to the open position.

An image carrier unit includes an image carrier including a cylindrical main body portion and a pair of flange portions attached to both ends of the main body portion, a first cleaning member that rotates in contact under a prescribed pressure with an outer circumferential surface of the main body portion, a unit frame that rotatably supports the image carrier and the first cleaning member, and an image carrier protective cover that includes a cover main body extending in an axial direction of the image carrier and a side surface portion that is disposed on one end side of the cover main body. On the side surface portion, an image carrier holding portion is formed that performs positioning of the image carrier with respect to the unit frame and releases a pressure contact state between the image carrier and the first cleaning member.

An image forming apparatus may include a photosensitive member, a developing device including a developing roller, pressing members configured to engage with the developing device and springs configured to urge the pressing members. In some examples, each of the pressing members may be configured to contact and move the developing device between various positions based on the urging of the springs. Additionally or alternatively, various ends of a contact surface of the developing roller configured to contact developer may be disposed relative to an axis line of the developing roller and pressing surfaces of the pressing members.

An image formation unit according to an embodiment may include: a main body that holds an image carrier; and a shutter unit including first and second shutter members rotatably held with respect to the main body, wherein the shutter unit transits between an opened state where the first and second shutter members are unfolded, a closed state where the first and second shutter members are folded, and an intermediate state between the opened and closed states; a guide member supported by the main body and configured to regulate a movement of the second shutter member in a direction away from the image carrier while abutting on a first abutting portion of the second shutter member when transiting between the closed and opened states; and a holding member configured to abut on a second abutting portion of the second shutter member so as to hold the intermediate state.

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.

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.

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 developer cartridge includes a housing, a developing roller, an agitator, a memory, and a cover. The housing is configured to store toner therein and has one end portion and the other end portion in a first direction. The developing roller is rotatable about a first axis extending in the first direction. The agitator is rotatable about a second axis extending in the first direction. The agitator is positioned spaced apart from the developing roller. The memory includes an electrical contact surface. The electrical contact surface is positioned at an outer surface of the housing and at the one end portion of the housing in the first direction, and is disposed between the developing roller and the agitator in a second direction from the first axis toward the second axis. The cover has an opening open in the second direction and covers the electrical contact surface.

A fixing device includes a first rotating body, a second rotating body, a frame, a shutter, a pressure arm, a cam, a shutter arm, and an arm cam. The shutter is rotatable about a first axis between a closed position and an open position. The pressure arm presses the first rotating body against the second rotating body. The cam is rotatable about a second axis and pushes the pressure arm. The shutter arm is connected to the shutter and rotates about the second axis independent of the cam, to cause the shutter to rotate between the closed position and the open position. The arm cam rotates about the second axis to push the shutter arm at a position offset from the second axis and cause the shutter arm to rotate about the second axis.