A developer cartridge includes a casing and a developer container detachably attached to the casing. The developer container includes a tubular member, a conveyor, an end member, and a sealing member. The tubular member is configured to contain developer therein and has an axis. The conveyor is disposed in the tubular member and is configured to convey the developer toward one end of the tubular member along the axis. The end member is disposed at a predetermined distance away from the one end of the tubular member. The sealing member is attached to an outer peripheral surface of the end member and an outer peripheral surface of the tubular member, and is configured to be broken with rotation of at least one of the tubular member and the conveyor.

An image forming apparatus includes comprising a main body casing, a drum cartridge, and a toner cartridge. The drum cartridge includes a photosensitive drum, a developing device, a developing casing, and a developing shutter. The developing device includes a developing roller, a developing casing, and a developing shutter. The toner cartridge includes a toner casing, a toner shutter, and a cushion member. The cushion member is positioned between the toner casing and the toner shutter. The cushion member is configured to allow the toner shutter, while the toner shutter is engaged with the developing casing, to move relative to the toner casing when the developing casing moves relative to the photosensitive drum in a state where the drum cartridge and the toner cartridge are attached in the main body casing, the developing shutter is in a developing open position, and the toner shutter is in a toner open position.

A developer container includes: a case that stores developer and in which a developer outlet for discharging the developer is formed; a conveying spiral that is rotatably disposed in the case and rotates to convey the developer toward the developer outlet in an axial direction of the conveying spiral; a guide wall that is disposed along the conveying spiral and guides the developer in the axial direction of the conveying spiral; and a push member that is attached to the conveying spiral and rotates with the conveying spiral to push the developer into the developer outlet. A cutout is formed at a portion of the guide wall corresponding to the push member to form a guide portion that guides the developer to the developer outlet.

An image forming apparatus includes a main assembly; a door; a discharging portion provided in the main assembly and provided with a first opening for discharging toner; and a toner receptor detachably mounted to the door to accommodate the toner, the toner receptor being provided with a second opening cooperative with the first opening to form a toner flow passage, wherein the receptor is movable, in a state that it is mounted on the door, between a contacting position in which the receptor contacts the discharging portion such that the second opening is in fluid communication with the first opening and a spacing position in which the receptor is spaced from the discharging portion, and wherein the receptor mounted on the door is movable between the contacting and the spacing positions in a direction inclined with respect to a contact plane of the discharging portion relative to the receptor.

A toner container includes a container main body having a toner replenishment port and a shutter mechanism. The shutter mechanism has a shutter member having a discharge port and a cover member supported by the shutter member so as to extend toward the replenishment port. The shutter member is movable in an opening direction from a closing position where the discharge port is retracted from the replenishment port to an opening position where the discharge port is communicated with the replenishment port and in a closing direction from the opening position to the closing position. The cover member has a tip end portion that extends toward the replenishment port as the shutter member moves in the closing direction, comes into contact with a downstream side edge portion of the replenishment port at the closing position and retracts from the replenishment port as the shutter member moves in the opening direction.

A developer container includes a container, provided with an opening and configured to accommodate a developer; a sealing member configured to cover the opening; and an unsealing member configured to unseal the opening by moving the sealing member. The sealing member opposes the container at a central opposing portion positioned in a central side and at an end opposing portion positioned at an end side with respect to a longitudinal direction of the unsealing member. The sealing member and the container are bonded to each other at bonding portion which is at least a part of the central opposing portion. The bonding force at the bonding portion of the central opposing portion is larger than a bonding force between the sealing member and the container at the end opposing portion.

An image forming apparatus includes comprising a main body casing, a drum cartridge, and a toner cartridge. The drum cartridge includes a photosensitive drum, a developing device, a developing casing, and a developing shutter. The developing device includes a developing roller, a developing casing, and a developing shutter. The toner cartridge includes a toner casing, a toner shutter, and a cushion member. The cushion member is positioned between the toner casing and the toner shutter. The cushion member is configured to allow the toner shutter, while the toner shutter is engaged with the developing casing, to move relative to the toner casing when the developing casing moves relative to the photosensitive drum in a state where the drum cartridge and the toner cartridge are attached in the main body casing, the developing shutter is in a developing open position, and the toner shutter is in a toner open position.

A process cartridge includes a photosensitive member and a developing unit. The developing unit includes a frame to store toner, a developing roller to carry the toner, a side seal to contact an end portion of the developing roller and prevent the toner from leaking out, and a sealing sheet to contact a center portion of the developing roller and prevent the toner from leaking out. A toner receiving portion of the frame includes an opening facing the developing roller and is disposed on an upstream side of the side seal and a downstream side of a contact portion where the developing roller contacts the photosensitive member, and moreover is disposed at a position overlapping with the side seal. The developing unit includes a blocking member to block at least a part of the opening, and the blocking member is disposed between the opening and the developing roller.

A developing apparatus includes a developing container, a lid that is fixed to the developing container and defines a storage space for developer, a developing roller, and a conveyance member for conveying the developer toward the developing roller. The conveyance member includes a sheet and a support member that supports the sheet and is rotatable about a rotation axis together with the sheet. The sheet has a first distance between the rotation axis and an edge of the sheet in a state in which the sheet is unbent. The lid includes a corner portion that extends the storage space outward of an imaginary circle with a radius of the first distance centered on the rotational axis, and a contact portion that protrudes from the corner portion to the inner side of the imaginary circle and is configured to come into contact with the rotating sheet.

A developing unit includes a conveying member which rotates to convey the developer to the developer bearing member. The conveying member includes a sheet portion with one end fixed to a rotation shaft and a free end which enters the developing chamber through an opening when the conveying member rotates around a rotation center, wherein relations C>A and B>A are satisfied, where A is a distance from the rotation center to an upstream end of the opening in a rotational direction, B is a distance from the rotation center to a downstream end of the opening in the rotational direction, and C is a length from the rotation center to the free end of the sheet portion in an unbent state. The upstream end of the opening is lower in a direction of gravitational force than the downstream end at an orientation in use.