A developer cartridge assembled to a developing device defining therein a developing chamber. The developer cartridge includes a first accommodating portion, and a first agitator. The first accommodating portion accommodates therein a developing agent and is positioned beside the developing device. The first accommodating portion includes a first wall part neighboring the developing device. The first wall part is formed with a first through-hole and a second through-hole. The first through-hole is open diagonally downward from the first accommodating portion to the developing device. The second through-hole is open diagonally upward from the first accommodating portion to the developing device. The first through-hole and the second through-hole allow communication between an interior of the first accommodating portion and the developing chamber. The first agitator is rotatably disposed in the first accommodating portion and in sliding contact with the first wall part in a vertical direction.

A developer cartridge assembled to a developing device defining therein a developing chamber. The developer cartridge includes a first accommodating portion, and a first agitator. The first accommodating portion accommodates therein a developing agent and is positioned beside the developing device. The first accommodating portion includes a first wall part neighboring the developing device. The first wall part is formed with a first through-hole and a second through-hole. The first through-hole is open diagonally downward from the first accommodating portion to the developing device. The second through-hole is open diagonally upward from the first accommodating portion to the developing device. The first through-hole and the second through-hole allow communication between an interior of the first accommodating portion and the developing chamber. The first agitator is rotatably disposed in the first accommodating portion and in sliding contact with the first wall part in a vertical direction.

A developing cartridge includes a developing roller 210d that develops, by way of a developer, an electrostatic latent image that is formed on an image bearing member 207; a developer regulating member that regulates the thickness of a developer carried on the developing roller 210d; and a frame 214a that rotatably supports the developing roller 210d and supports the developer regulating member. The frame 214a has a developing roller support section 214a1 that rotatably supports an outer peripheral face 210d6 of at least one end of the developing roller 210d. The developing roller support section 214a1 has a clearance at a position that, when viewed in the axial direction of the developing roller 210d, overlaps a contact region at which the developing roller 210d is in contact with the image bearing member 207.

A cartridge includes: a housing; a storage medium including an electrical contact surface; and a storage medium holder holding the storage medium and movable relative to the housing. The storage medium holder is positioned at one end portion of the housing in a first direction and includes: a first holder holding the electrical contact surface; a second holder positioned spaced away from the first holder in a second direction crossing the first direction; and an elastic member expandable and shrinkable in the second direction between the first holder and the second holder. The first holder has a first hole penetrating the first holder in the second direction. The first hole is positioned farther from the housing in the first direction than the second holder and the elastic member are from the housing in the first direction and is overlapped with the electrical contact surface as viewed in the second direction.

A developing cartridge includes a housing for accommodating a toner, a developing roller rotatably mounted in the housing, a doctor blade in contact with the developing roller, and a driving device located at a longitudinal end of the housing. The driving device includes a driving force receiving part for receiving a driving force from the outside of the developing cartridge, and is configured to drive the developing roller to rotate. The doctor blade is in contact with a surface of the developing roller to adjust a thickness of a toner layer on the surface of the developing roller. When viewed along a longitudinal direction of the developing cartridge, at least the driving force receiving part does not overlap with the doctor blade.

An image forming apparatus includes a casing, a door, first and second switching portions, an interlocking portion, and an operating portion. The first switching portion is switched to a first state in which the door is rotatable from a closed position to a first opened position and a second state in which the door is rotatable from the first opened position to a second opened position. The second switching portion is switched to a third state in which the door is rotatable from the closed position to the first opened position and a fourth state in which the door is rotatable from the first opened position to the second opened position. The interlocking portion interlocks the first and second switching portions. The operating portion switches the first switching portion to the first and second states, and switches the second switching portion to the third and fourth states.

A cartridge includes: a housing; a storage medium including an electrical contact surface; and a storage medium holder holding the storage medium and movable relative to the housing. The storage medium holder is positioned at one end portion of the housing in a first direction and includes: a first holder holding the electrical contact surface; a second holder positioned spaced away from the first holder in a second direction crossing the first direction; and an elastic member expandable and shrinkable in the second direction between the first holder and the second holder. The first holder has a first hole penetrating the first holder in the second direction. The first hole is positioned farther from the housing in the first direction than the second holder and the elastic member are from the housing in the first direction and is overlapped with the electrical contact surface as viewed in the second direction.

A cartridge is configured to be attachable to a main body of an image forming apparatus and configured to receive toner supplied from a supply container. The cartridge includes a supply port configured to receive the toner supplied from the supply container, a shutter member configured to cover the supply port, and a locking member. The locking member is moved from a lock position to an unlock position to allow movement of the shutter member by using electric power supplied from the main body.

A developing device includes a developing roller, a resin frame, a sealing member, a first resin sheet, and a second resin sheet. The second resin sheet is arranged with the first resin sheet in a first direction on a side downstream of the first resin sheet. The resin frame includes a bearing surface, and first to third injection port marks. The bearing surface extends in a second direction crossing the first direction on a side downstream of the second resin sheet with respect to the first direction. The first and second injection port marks are provided on a side upstream of the first resin sheet with respect to the first direction and are arranged in the second direction. The third injection port mark is provided on a side downstream of the second sheet and upstream of the bearing surface with respect to the first direction.

A cartridge is configured to be attachable to a main body of an image forming apparatus and configured to receive toner supplied from a supply container. The cartridge includes a supply port configured to receive the toner supplied from the supply container, a shutter member configured to cover the supply port, and a locking member. The locking member is moved from a lock position to an unlock position to allow movement of the shutter member by using electric power supplied from the main body.