ELECTROPHOTOGRAPHIC PHOTOSENSITIVE DRUM HAVING TWISTED PROJECTION COUPLING MEMBER ENGAGEABLE WITH TWISTED HOLE DRIVING COUPLING OF MOTOR, AND PROCESS CARTRIDGE AND ELECTROPHOTOGRAPHIC IMAGE FORMING APPARATUS USING SAME

摘要

A process cartridge detachably mountable to a main assembly of an electrophotographic image forming apparatus. The apparatus includes a motor, a driving rotatable member for transmitting a rotational driving force having a twisted hole formed at a central portion and having a non-circular cross-section with corner portions, and a transfer roller. The process cartridge includes an electrophotographic photosensitive drum, process components, a twisted projection of non-circular cross-section provided at a longitudinal end of the drum that is engageable with the twisted hole at three positions to receive the driving force from the main assembly, and a gear for transmitting the driving force received by the twisted projection to the transfer roller when the process cartridge is mounted to the main assembly.