Abstract: A cartridge includes a cartridge main body, a protection member, a rib of the cartridge main body, and a pair of guides of the protection member, wherein an upstream-side guide of the guides can guide the rib when the cartridge main body is inserted into a device main body, and terminates the guide after allowing the cartridge main body to be inserted up to a position where the cartridge main body becomes independent of the device main body.

Abstract: An image forming apparatus includes an image bearing member unit; a developing unit; an accommodating portion configured to accommodate the image bearing member unit and the developing unit and provided with an inserting opening; a door for the opening; a pressing mechanism for pressing and releasing the image bearing member unit and the developing unit relative to each other in interrelation with the openable member; and a contact surface provided on the openable member, the contact surface is contactable with an upstream end portion of one of the units, when the openable member is closed in a state that the upstream end portion is projected out of the opening, wherein an angle formed between a normal line of the contact surface and the inserting direction in a downstream side is not less than 90 degrees.

Abstract: A developing device includes a first chamber; a second chamber; a partition; a developer discharging path; a first feeding member; a second feeding member including a first spiral portion and a second spiral portion and a disk portion provided opposed to the developer discharging path in a position downstream of the second spiral portion of the first spiral portion, second spiral portion having a direction of helicity which is different from that of the first spiral portion. The disk portion is provided with a projected portion extending from a developer discharging path side surface in an axial direction of the second feeding member, the projected portion being disposed in a range outside of an area of the developer discharging path projected in the axial direction of the second feeding member.