Patent ID: 6885838

Claim:
A process cartridge which is detachably mountable to a main assembly of an electrophotographic image forming apparatus for forming an image on a recording material, the apparatus including a motor, a driving rotatable member for transmitting a rotational driving force from the motor and having a twisted hole formed therein at a central portion thereof having a non-circular cross-section with a plurality of corner portions, and a transfer roller, said process cartridge comprising: an electrophotographic photosensitive drum; process means actable on said electrophotographic photosensitive drum; a twisted projection provided at a longitudinal end of said electrophotographic photosensitive drum and having a non-circular cross-section, said projection being engageable with the twisted hole at three positions to receive the driving force from the main assembly when said process cartridge is mounted to the main assembly; and a gear for transmitting the driving force received by said twisted projection to the transfer roller when said process cartridge is mounted to the main assembly, wherein the rotational driving force is transmitted from said driving rotatable member to said electrophotographic photosensitive drum by engagement between the twisted hole and said twisted projection, and wherein said twisted projection is urged toward the twisted hole when said driving rotatable member is rotated with said twisted projection being in engagement with the twisted hole when said process cartridge is mounted to the main assembly.