An image forming apparatus includes a developer container to and from which a replenishment container is attachable and detachable, the developer container including an accommodating portion, and a supporting portion, wherein the developer container includes a projection portion that is provided at one end portion thereof in the rotation axis direction of the developer bearing member and projects toward the supporting portion more than a center portion of the developer container in a crossing direction crossing the rotation axis direction, the projection portion communicates with the accommodating portion and includes, at a distal end portion thereof, an attachment portion configured such that the replenishment container is attachable thereto in a state of being exposed to the outside of the apparatus, and a replenishment port for replenishing the accommodating portion with developer from the replenishment container is defined in the attachment portion.

An image forming system includes a toner container and an image forming apparatus to which the toner container is detachably mountable. The image forming apparatus includes a mounting portion to which the toner container is detachably mountable. The toner container includes an accommodating portion configured to accommodate toner, a discharge portion provided with an opening for discharging the toner in the accommodating portion to outside of the toner container, a rotatable member rotatable, relative to the discharge portion, about a rotational axis in a first rotational direction and a second rotational direction that is opposite to the first rotational direction, and a projection provided below the opening of the discharge portion, the projection having inner peripheral surface such that, when the toner container is oriented in a predetermined direction in which the rotational axis extends in a direction of gravity and at least a part of the discharge portion is below the accommodating portion, the inner peripheral surface faces inward in a radial direction of an imaginary circle centered on the rotational axis.

A developer container is provided with a container body and a covering. The container body has a storage part for containing a developer and a discharge port used for discharging the developer contained in the storage part to outside of the container body. The covering covers a forming surface of a containing space of the developer in the storage part, and is provided so as to be drawable from the discharge port to outside of the container body.

A developer storage container includes a storage portion, a communication portion, and a gear portion. The storage portion conveys developer stored therein in a conveying direction parallel to a rotation axis by being rotated around the rotation axis in a specific direction. The communication portion has a tubular shape coaxial to the rotation axis and extending in the conveying direction from an end of the storage portion on a downstream side in the conveying direction, includes an inner peripheral part that gradually increases its diameter in the conveying direction, and connects the storage portion to an opening portion that has an opening facing the conveying direction. The gear portion is provided for an outer peripheral part of the communication portion and receives a rotational driving force supplied from the outside.

A method of remanufacturing an imaging cartridge comprising a toner hopper having a toner bag and not having a seal port, the method comprising forming a seal port in the toner hopper; disposing a replacement toner container in the toner hopper, the replacement toner container including a removable seal having a seal tail; and inserting a portion of the seal tail through the seal port. A method of remanufacturing an imaging cartridge comprising a toner hopper having a toner bag and not having a seal port, the method comprising providing a replacement toner hopper having a seal port; removing the toner hopper not having the seal port from the imaging cartridge; and attaching the replacement toner hopper having a seal port to the imaging cartridge.

A conveyance mechanism which includes a rotation shaft extending in a direction along a first direction connecting first and second discharge ports that is rotatable with a rotation axis extending in the first direction. Wherein, a first rotation conveyance unit is disposed on the rotation shaft, and is rotatable together with the rotation shaft, conveys developer toward the first discharge port, and a second rotation conveyance unit is disposed on the rotation shaft, and is rotatable together with the rotation shaft, conveys developer toward the second discharge port. The second rotation conveyance unit is configured to provide a larger amount of conveyance than the first rotation conveyance unit.

A method of packaging a flexible toner bag holding toner including placing the toner bag in a reduced pressure bag; removing at least a portion of the air inside the reduced pressure bag; and sealing an opening of the reduced pressure bag to form a reduced pressure bag assembly.

A developing cartridge includes a developing roller, a developer bag, a housing, and a shaft. The developer bag stores a developer therein. The housing includes a developer storage chamber accommodating the developer bag therein. The housing supports the developing roller. The shaft is fixed to the developer bang and movable pull the developer bag theretoward.

A developing cartridge includes: a casing; a developer container; a developing roller; an unsealing mechanism; a first rotary body; a second rotary body; and a delayed transmission mechanism. The developer container is sealed to accommodate developer. The unsealing mechanism unseals the developer container. The first rotary body is provided at the unsealing mechanism. A drive force from a drive source is transmitted to the first rotary body and the second rotary body. The second rotary body transmits the drive force to the developing roller. The delayed transmission mechanism delays transmission of the drive force to the second rotary body for at least a prescribed time after transmission of the drive force to the first rotary body is initiated. The prescribed time is equivalent to a time that elapses from a moment the unsealing mechanism begins rotating to a moment the unsealing mechanism has unsealed the developer container.

A developer cartridge includes a first flexible container, a second flexible container, and a housing accommodating the first flexible container and the second flexible container. The first flexible container is openably sealed. The second flexible container is openably sealed. At least one of the first flexible container and the second flexible container stores developer.