Patent ID: 7890025

Claim:
A process cartridge detachably mountable to a main assembly of an electrophotographic image forming apparatus, wherein the main assembly includes a first rotatable main assembly drive transmission member, and a second rotatable main assembly drive transmission member, said process cartridge comprising: an electrophotographic photosensitive drum; a developing roller configured and positioned to develop an electrostatic latent image formed on said electrophotographic photosensitive drum with a developer; a drum coupling member, provided on one end of a rotational axis of said electrophotographic photosensitive drum, configured and positioned to engage the first main assembly drive transmission member and to transmit a first rotational driving force to said electrophotographic photosensitive drum, when said process cartridge is mounted to the main assembly of the apparatus along the direction of the rotational axis of said electrophotographic photosensitive drum; a shaft coupling member, provided on one axial end of said developing roller, configured and positioned to transmit a second rotational driving force with a deviation permitted between a rotational axis of the second main assembly drive transmission member and a rotational axis of said developing roller, with respect to a direction crossing the rotational axis of said developing roller, wherein said shaft coupling member includes an engaging portion configured and positioned to engage the second main assembly drive transmission member and to receive the second rotational driving force, when said process cartridge is mounted to the main assembly of the apparatus, and wherein said engaging portion is movable in the direction crossing the direction of the rotational axis of said developing roller; and a holding portion configured and positioned to hold said engaging portion such that a rotational axis of said engaging portion is placed in a position deviated from the rotational axis of said developing roller with respect to the crossing direction to engage said engaging portion with the second main assembly drive transmission member when said process cartridge enters the main assembly of the apparatus.