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 drum unit containing said 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 developing unit containing said developing roller and movably connected with said drum unit, said developing unit being movable relative to said drum unit between a contact position in which said developing roller is contacted to said electrophotographic photosensitive drum and a spaced position in which said developing roller is spaced from said electrophotographic photosensitive drum;
- a drum coupling member, provided on one axial end 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 the electrophotographic photosensitive drum, when said process cartridge is mounted to the main assembly of the apparatus along an axial direction of said electrophotographic photosensitive drum;
- and
- an Oldham coupling configured and positioned to transmit the second rotational driving force to said developing roller with a deviation, with respect to a direction crossing an axis of said developing roller, permitted between an axis of the second main assembly drive transmission member provided on one axial end of said developing roller and an axis of said developing roller, wherein said Oldham coupling includes a driving side engaging portion configured and positioned to engage the second main assembly drive transmission member when said process cartridge is mounted to said main assembly of the apparatus, wherein said driving side engaging portion is movable in the crossing direction and is effective to receive the second rotational driving force, a following side engaging portion fixed to said developing roller, and an intermediary engaging portion which is engaged with said driving side engaging portion and with said following side engaging portion and which is movable with the engagement maintained with said driving side engaging portion and with said following side engaging portion when said developing unit moves between the contact position and the spaced position in a state in which said driving side engaging portion is in engagement with the second main assembly drive transmission member;
- a holding portion configured and positioned to hold said engaging portion such that when said process cartridge enters said main assembly of the apparatus with said developing unit positioned in the spaced position, an axis of said engaging portion is deviated from the axis of said developing roller with respect to the crossing direction to engage said engaging portion with the second rotatable main assembly drive transmission member.