Patent ID: 8706008

Claim:
An image forming apparatus comprising: a main body; a cartridge including an image bearing member rotatably disposed thereon and being detachably mounted to the main body; a first engagement portion rotatably disposed on a side of the main body and including a plurality of first engagement claws for inputting a drive into the cartridge; a shaft passing through the image bearing member and rotatably disposed with the first engagement portion; a second engagement portion disposed on a side of the cartridge and including a plurality of second engagement claws to engage with the plurality of first engagement claws; an intermediate transfer member configured to come into contact with the image bearing member and to be rotated so that an image formed on the image bearing member is transferred to the intermediate transfer member; and an urging portion configured to urge one of the first engagement portion and the second engagement portion against an other of the first engagement portion and the second engagement portion so that at least one of the plurality of first engagement claws and at least one of the plurality of second engagement claws engage with each other in a rotation direction, regardless of a phase of the first engagement portion, wherein the urging portion includes a positioning portion configured to position the shaft, and wherein the urging portion is configured to urge one of the first engagement portion and the second engagement portion against the other of the first engagement portion and the second engagement portion by bending the shaft with the positioning portion.