A developing device includes a developing case, a filter, and a filter holder. The developing case stores developer inside to develop a latent image formed on a surface of an image bearer and has an opening portion that communicates between an inside and an outside of the developing device. The filter has a lower weight density per unit volume at a first side of the filter facing the inside of the developing device than a weight density per unit volume at a second side of the filter facing the outside of the developing device. The filter holder is detachably attached to the opening portion of the developing case with the filter held by the filter holder.

A toner sealing system is described including a seal having first and second alignment features. The seal is selectably installable on one of a first toner container of a first type and a second toner container of a second type. The first alignment feature is matable with a first corresponding alignment feature on the first toner container when the seal is installed on the first toner container for aligning the seal to the first toner container. The second alignment feature is matable with a second corresponding alignment feature on the second toner container when the seal is installed on the second toner container for aligning the seal to the second toner container. Embodiments include those wherein the first alignment feature does not align the seal to the second toner container, and the second alignment feature does not align the seal to the first toner container.

A developing device includes a developing container, a developer carrier, a seal member, and a pair of pressing members. The developing container has an opening. The seal member includes a contact end part that makes contact with an entire region of an outer circumferential surface of the developer carrier in its rotary shaft direction and is one of end edges of the seal member in a longitudinal direction thereof on a side near the developer carrier and an interposed end part that is interposed between each of both end parts of the developer carder and a corresponding one of the pressing members and is an end edge of the seal member orthogonal to the contact end part, and a chamfered shape is formed at a corner between the contact end part and the interposed end part.

A first contact portion provided on a first shutter member that opens and closes a receiving port for receiving a developer from a cartridge and a second contact portion provided on the cartridge are configured to contact each other in an attachment and detachment direction of the cartridge so that the first shutter member is in a position at which the receiving port is opened. The first shutter member is urged by a first urging member so that a contacting state between the first contact portion and the second contact portion is maintained until a second shutter member that opens and closes a supplying port of the cartridge closes the supplying port when the cartridge is discharged from the apparatus body.

A method of remanufacturing a toner cartridge includes installing a modified end cap in which a portion of a drive assembly for an internal toner seal removal mechanism has been disabled. With the modified end cap installed, the toner cartridge may be post tested without removing the internal toner seal. When the post test is complete the modified end cap is removed and a non-modified end cap with a functional drive assembly is installed in its place.

A toner case includes a case main body, a cover, and a seal member. The case main body is configured to contain a toner and to rotate. The cover is configured to cover an opening part arranged at the case main body and to maintain a rotation stop state when the case main body rotates. The seal member is interposed between the case main body and the cover and configured to maintain a rotation stop state when the case main body rotates. At least a part of the seal member is composed of an elastic material.

A toner case includes a case main body, a transmission member, and a cover. The case main body contains a toner and rotates around a rotation axis line. The transmission member is attached to an outer circumferential face of the case main body and configured to transmit rotation driving force to the case main body. The cover is configured to cover an opening part arranged at the case main body. The case main body includes a rotation restricting part and a movement restricting part. The rotation restricting part is configured to restrict a rotation of the transmission member with respect to the case main body. The movement restricting part is configured to restrict a movement in a direction of the rotation axis line of the transmission member with respect to the case main body. The transmission member is positioned between the cover and the movement restricting part.

A toner case includes a case main body, a cover, and an agitating member. The case main body is configured to contain a toner and to rotate. The cover is configured to cover an opening part arranged at the case main body and to maintain a rotation stop state when the case main body rotates, the cover having a communication space which communicates with an inside space of the case main body via the opening part. The agitating member is configured to rotate integrally with the case main body and to agitate the toner in the communication space.

A regulation member includes an opposed surface and a contact surface in a portion corresponding to an image forming area. The opposed surface is opposed to a developer bearing member. The contact surface protrudes from the opposed surface and has a height different from that of the opposed surface. An end seal seals a gap between a frame body, the developer bearing member, and the regulation member. The regulation member further includes an area not having the contact surface between the image forming area and a sealing area in which the regulation member and the end seal overlap. In the sealing area, a step between the opposed surface and the contact surface has a height of greater than or equal to 0 mm and not greater than 0.10 mm.

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.