An embodiment of the present disclosure provides a developing cartridge, including: a developing cartridge frame having an internal space for accommodating a developing agent; a developing roller rotatably mounted on the developing cartridge frame and configured to supply the developing agent to a photosensitive drum; a drive end cover mounted on a drive end of the developing cartridge frame; and a drive force receiving member rotatably mounted on a drive end of the developing cartridge frame; where the drive force receiving member includes a drive force receiving part that extends out of the drive end cover and receives a rotational drive force. A driving end separation force receiving member is provided on an outer circumference of the drive force receiving part. The driving end separation force receiving member is configured to receive a separating force that separates the developing roller from the photosensitive drum.

A developer supply kit detachably mountable to a developer supplying apparatus comprising a developer supply container and a developer accommodated therein, wherein the developer supply container includes, a developer accommodating portion accommodating the developer, a discharge opening for discharging the developer accommodated in the developer accommodating portion, a drive receiving portion to which a driving force is inputted from the developer supplying apparatus, and a pump portion operable so that an internal pressure of the developer accommodating portion alternately and repetitively changes between a pressure lower than a ambient pressure and a pressure higher than the ambient pressure, by the driving force received by the drive receiving portion, wherein the developer accommodated in the developer supply container includes toner containing binder resin material and a coloring material, the developer satisfies,
10≦E (mJ)≦80,
0.4≦Ea (mJ)≦2.0, where E is total energy when it is not aerated, and Ea is total energy when it is aerated.

In one embodiment, a toner container comprises a toner container body in which toner is stored, a cover portion configured to cover the toner container body, and a projection. The projection is provided in the vicinity of a rear end portion in a longitudinal direction of the cover portion or a longitudinal direction of the toner container body, and projecting toward a rear side of the toner container.

A toner cartridge includes a toner lock member. A developing unit includes a developing lock member configured to lock a developing shutter in a first closed position in a state where the toner cartridge is detached from the developing unit. When the toner cartridge is detached from the developing unit, the toner lock member is in a lock position. When the toner cartridge is attached to the developing unit, the casing is pivotable relative to the developing unit between a first position and a second position. When the casing is at the first position, the toner shutter closes a toner opening and the developing shutter is at the first closed position. When the casing is at the second position, the toner shutter opens the toner opening, the toner lock member is in an unlock position, and the developing shutter is at the first open position.

A toner cartridge comprises a toner container which contains toner, a driving member which 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 (rad/s) of the driven member is K=R2/R1.

In one embodiment, a toner container comprises a toner container body in which toner is stored, a cover portion configured to cover the toner container body, and a projection. The projection is provided in the vicinity of a rear end portion in a longitudinal direction of the cover portion or a longitudinal direction of the toner container body, and projecting toward a rear side of the toner container.

A pump portion 21 which is variable in volume, a feeding path portion 24 including a connection opening connected to the pump portion 21 at one end and including a discharge opening 23 at the other end, and a toner accommodating portion 22 connected to an intermediate portion between the one end and the other end of the feeding path portion 24 and for accommodating the toner are provided, and a volume change amount of the pump portion 21 is larger than a total volume from the connection opening to the discharge opening 23 of the feeding path portion 24.

A powder container contains powder and is attached to an image forming apparatus including: a conveying nozzle to convey the powder; a powder receiving hole of the conveying nozzle to receive the powder from the powder container; an apparatus main-body gear to transmit a driving force to the powder container; and a container receiving section including the conveying nozzle and receiving the powder container. The powder container includes: an opening at one end of the powder container in a longitudinal direction; a nozzle receiver at the opening to receive the conveying nozzle; a conveyor to convey the powder; and a container gear to drive the conveyor by meshing with the apparatus main-body gear. The container gear is to mesh with the apparatus main-body gear at a position closer to the opening than the powder receiving hole in the longitudinal direction. The opening is to mate with the container receiving section.

A cartridge includes a shutter that opens and closes when the cartridge is attached and detached to a developing unit or image forming apparatus. The cartridge includes a casing having a chamber with a first opening at one end portion allowing toner to flow out of the casing. The cartridge includes a cover that covers the first opening, movable with the casing and having a second opening allowing toner to flow out of the cover. The shutter is located at the one end portion and has a protrusion further from the one end portion than the cover. The developing unit supports the protrusion when the cartridge is mounted thereon, and the casing pivots with the cover relative to the developing unit between a first position where the shutter closes the second opening and a second position where a third opening of the shutter overlaps the second opening.

In a remanufacturing method for remanufacturing a cartridge from a material cartridge, the material cartridge is attachable to and detachable from an apparatus main body of an image forming apparatus, and the apparatus main body includes a guide member. The material cartridge includes a frame member including an engagement portion configured to be engaged with the guide member, and a first attachment portion provided in the engagement portion, and a first storage member. The first storage member includes a first holding portion configured to hold a first electrode and be attached to the first attachment portion. The remanufacturing method includes detaching the first holding portion, attaching a second electrode to the frame member, and attaching a second storage element to the frame member at a different position from a position of the first attachment portion.