| 摘要 |
A process cartridge detachably mountable to a main assembly of an electrophotographic image forming apparatus, wherein the main assembly includes a motor, a main assembly side gear for receiving driving force from the motor and a main assembly recess defined by twisted surface, the main assembly recess being substantially coaxial with the gear, and a main assembly projection provided in the main assembly and substantially coaxial with the gear, the process cartridge includes an electrophotographic photosensitive drum (7); process means actable on the photosensitive drum; and a twisted cartridge projection engageable with the twisted surfaces, the projection (17a) being provided at a longitudinal end of the photosensitive drum; a cartridge recess provided at a free end of the cartridge projection and substantially coaxial with the cartridge projection, wherein when the process cartridge is mounted to the main assembly, the main assembly projection enters the cartridge recess; wherein, when the main assembly side gear rotates with the main assembly recess and cartridge projection engaged with each other, rotational driving force is transmitted from the gear to the photosensitive drum through engagement between the main assembly recess and the cartridge projection (17a). |
