An image forming apparatus includes a drum cartridge including a photosensitive drum, a developing cartridge including a developing roller, a main assembly. The main assembly includes a first opening, a second opening, a first openable member, a second openable member, a pressing member, a first pressing releasing member for releasing the developing cartridge from the pressing member in a state in which the second openable member is in a second closed position, in interrelation with movement of the first openable member from a first closed position to a first open position, and a second pressing releasing member for releasing the pressing the developing cartridge from the pressing member in interrelation of movement of the second openable member from a second closed position to a second open position.

A toner cartridge comprises a toner container which contains toner, a driving member winch rotationally drives a conveying member, an agitating member Which agitates a toner in the toner container while being rotated, a driven member which rotates in association with the driving member which is for rotationally driving the agitating member, and a rotational body which rotates according to rotation of the driven member, has a plurality of slits in rotational circumference for identifying a type of the toner cartridge, and has 1/K or more of the slits when a ratio of a rotational speed R1 (rad/s) of the driving member and a rotational speed R2 (rack) of the driven member is K=R2/R1.

A developer cartridge according to one aspect is attachable to a photoconductor unit that comprises a photoconductive drum. The developer cartridge may comprise a main body having an opening, the main body comprising an electric circuit, a front cover configured to move to an opening position in which the opening of the main body is exposed and to a closing position in which the opening of the main body is closed, a first terminal electrically connected to the electric circuit, a photosensitive drum, and a developer cartridge comprising a developing roller, developing frame having a pressed portion, memory unit and second terminal. The front cover may include a pressing portion configured to press the pressed portion of the developing frame in a direction from the developing roller toward the photosensitive drum, and wherein the second terminal faces to the front cover when the front cover is in the closed position.

An image forming apparatus includes a drum cartridge and developing cartridge. The drum cartridge may include a photosensitive drum rotatable about a first axis extending in an axial direction. The developing cartridge may include a developing roller rotatable about a second axis extending in the axial direction. The image forming apparatus may include a main casing including a slot extending in the axial direction. The image forming apparatus may include a first inner surface positioned inside of the slot, and a second inner surface positioned inside of the slot farther from the cover in the axial direction than the first inner surface from the cover in the axial direction. The first and second inner surfaces may be configured to press the developing roller toward the photosensitive drum.

The present disclosure provides a developer supply container and a developer supply method using the same. The developer supply container includes a container body, a piston rod and a piston sealing element. The piston sealing element is inserted into the container body; an outer side of an end of the piston rod is fixedly connected with a bolt; a first conductive iron sheet is provided near to a front side of an end of the bolt, a lower side of the first conductive iron sheet is provided with a second conductive iron sheet, and an end of each of the first conductive iron sheet and the second conductive iron sheet is electrically coupled with a processor chip fixed at the container body; and the end of the container body away from the piston rod is provided with a powder outlet deviating from a center of the container body.

An image forming apparatus includes: a cartridge; a developer container, in which the cartridge allows the developer container to be movable between first and second positions; an apparatus main body including an opening through which the cartridge passes when the cartridge is attached and an opening and closing member movable between an open position to open the opening and a close position to close the opening; and a moving member moving to be at different positions between a case where the developer container is attached at the first position and a case where it is attached at the second position, and when the developer container is attached at the first position, the moving member is at a position of preventing movement from the open position to the close position, and when it is attached at the second position, the moving member is at a position of allowing the movement.

An image forming apparatus includes: a casing; photosensitive drums juxtaposed with each other in a juxtaposed direction; developing units each including a developing roller; an opening-closing member; and a first contacting-separating member. The opening-closing member is movable between an open position and a closed position. The first contacting-separating member is provided at the opening-closing member and movable relative to the casing in the juxtaposed direction for moving, in a state where the opening-closing member is at the closed position, the developing roller between an adjacent position adjacent to or in contact with the corresponding photosensitive drums and a separated position spaced apart from the corresponding photosensitive drums.

A developer cartridge according to one aspect is attachable to a photoconductor unit that comprises a photoconductive drum. The developer cartridge may comprise a main body having an opening, the main body comprising an electric circuit, a front cover configured to move to an opening position in which the opening of the main body is exposed and to a closing position in which the opening of the main body is closed, a first terminal electrically connected to the electric circuit, a photosensitive drum, and a developer cartridge comprising a developing roller, developing frame having a pressed portion, memory unit and second terminal. The front cover may include a pressing portion configured to press the pressed portion of the developing frame in a direction from the developing roller toward the photosensitive drum, and wherein the second terminal faces to the front cover when the front cover is in the closed position.

An apparatus main body includes a main casing and a cover configured to rotatably move about a rotational axis located below an opening between an open position and a closed position. A drum cartridge includes a photosensitive drum and is configured to be installed into the apparatus main body through the opening. A developing cartridge includes a developing roller and is configured to be installed into the apparatus main body through the opening. A swing plate is attached swingably to the apparatus main body. The swing plate supports the developing cartridge. The swing plate includes a guide configured to guide installation of the developing cartridge into the apparatus main body. The swing plate is configured to swingably move in a state where the drum cartridge and the developing cartridge are installed in the apparatus main body, thereby causing the developing roller to move relative to the photosensitive drum.

An image-forming device includes a main casing, a belt accommodated in the main casing, developing units arranged along the belt, a drawer configured to detachably support the developing units, the drawer configured to move to a position inside the main casing and to a position outside the main casing, and the drawer having a leading end and a trailing end in a pulling direction from the inside position to the outside position; and a guide configured to guide the drawer and to move between a first position and a second position when the drawer is at the inside position, the second position being farther from the belt than the first position from the belt. When the guide is at the second position, the guide is configured to be tilted downward relative to a horizontal direction such that the leading end is lower than the trailing end.