A second unit includes a restricted portion that comes into contact with a restricting portion provided to a body of an apparatus, the restricted portion coming into contact with the restricting portion, in order to restrict the movement of a developer carrier in a direction to make contact with an image carrier, when a developing cartridge has not reached a predetermined attachment position, and not coming into contact with the restricting portion when the developing cartridge is in the predetermined attachment position.

An image forming apparatus includes a power transmission member, a bias portion, a cam, and an interlocking mechanism. The power transmission member is displaceable between connected and released positions where the power transmission member is respectively connected to and disconnected from the detachable portion, and transmits the driving force of a drive portion to the detachable portion while connected to the detachable portion. The bias portion biases the power transmission member in a first direction to the connected position. The cam pivots from a first position to a second position to displace the power transmission member from the connected position to the released position, and is biased by the bias portion in a second direction to the first position when in the second position. The interlocking mechanism causes the cam to pivot from the first to the second position as a cover member changes its state from closed to open.

An image forming apparatus includes a support frame, a driving device including a first supporting portion configured to hold the drive source on a first surface and configured to rotatably support the drive gear on a second surface, and a second supporting portion configured to support the drive gear with the first supporting portion, a board holding member disposed in a manner overlapping the first supporting portion in a rotational axis direction of the drive gear, and a third supporting portion disposed between the first supporting portion and the board holding member in the rotational axis direction, and configured to support the board holding member, one end of the third supporting portion being fixed to a side of the first surface of the first supporting portion by a first fastening member, another end of the third supporting portion being fixed to the board holding member by a second fastening member.

An image forming apparatus includes a development cartridge having a developing roller. The developing roller includes a roller body, and a shaft to pass through a central axis of the roller body. A coupling structure is disposed at an end part of the shaft, is movable from a first position to a second position, and includes a first coupling piece and a second coupling piece. Positions of the first coupling piece and the second coupling piece are maintained with respect to one another by a static frictional force between surfaces of the first coupling piece and the second coupling piece to hold the coupling structure in the first position. When a predetermined force overcomes the static frictional force, the first coupling piece and the second coupling piece disengage from one another to allow the coupling structure to move from the first position to the second position.

A cartridge includes a photosensitive drum and a casing rotatably supporting the photosensitive drum. A coupling is operatively connected to the photosensitive drum so as to be capable of transmitting a driving force toward the photosensitive drum. The coupling includes a main body, a movable portion movable relative to the main body of the coupling between a first position and a second position, and a projection configured to move in a circumferential direction of the coupling relative to the main body of the coupling in response to movement of the movable portion from the first position to the second position.

A developing cartridge may include: a casing; a developing roller extending in a first direction; a developing-roller gear; a coupling including a coupling gear; a first idle gear; a second idle gear; an agitator; a first agitator gear; and a protrusion. The developing-roller gear, the coupling, the first idle gear, the second idle gear, the first agitator gear, and the protrusion may be positioned at an outer surface of the casing. The protrusion may be positioned between a first axis of the coupling and a third axis of the first agitator gear in a second direction connecting the first and third axes. The protrusion may be positioned outside an addendum circle of the developing-roller gear, an addendum circle of the coupling gear, an addendum circle of the first idle gear, and an addendum circle of the second idle gear. The first agitator gear may be spaced apart from the protrusion in the first direction.

A developing cartridge and an electronic imaging apparatus, where the developing cartridge is detachable installed in the electronic imaging apparatus, and includes a cartridge, a power reception member, a rotary member and an activation member; the cartridge includes a first side wall and a second side wall provided opposite to each other along a first direction, where a power reception member is located at the first side wall, a rotary member is installed between the first side wall and the second side wall, one end of the rotary member is provided with a first gear, and the other end of the rotary member is provided with a second gear, an activation member is located at the second side wall; and the activation member includes a movable member and a trigger part provided at the movable member.

A sheet feeding apparatus includes a supporting portion to support a sheet, a feeding portion to feed the supported sheet, and a base member opposed to the supporting portion so the sheet is supported by the supporting portion between the supporting portion and the base member. A regulation unit includes a regulation portion to regulate a position of an edge portion of the supported sheet and moves in a moving direction, and a sensor outputs an output value that changes in accordance with an amount of movement of the regulation unit. The sensor and the regulation unit are supported by the base member, and the sensor is supported by the base member at a position above an abutment position between the sheet supported by the supporting portion and the feeding portion in a gravity direction.

Provided is a method for removing a first holder member from a second holder member in a cartridge. The cartridge includes: a housing; the first holder member holding an electrical contact surface; and the second holder member supported by the housing. The first holder member includes a pawl, and the second holder member includes a corner part engageable with the pawl of the first holder member. The electrical contact surface is held at one end surface of the first holder member in a first direction crossing the electrical contact surface. The method includes: disengaging the pawl from the corner part; and separating the housing and the second holder member from the first holder member in the first direction away from the one end surface of the first holder member.

A process cartridge is provided. The process cartridge is detachably mounted in an image formation apparatus configured with a power output unit that is swingable, an outer circumference of the power output unit contains a recessed portion. The process cartridge includes: a power receiving unit, comprising a wheel hub and a power receiving member connected with the wheel hub, the power receiving member being engaged with the power output unit to receive a driving force; where the wheel hub comprises a hollow cylinder portion accommodating the power output unit; where the power receiving member includes a fixing protrusion, the fixing protrusion is engaged with the recessed portion of the power output unit to receive the driving force; where the power receiving unit further comprises a bias part, the bias part applies a bias force to drive the power output unit to move to engage with the fixing protrusion.