Process cartridge and electrophotographic image forming apparatus

摘要

An electrophotographic image forming apparatus for forming an image on a recording material includes an electrophotographic photosensitive drum; charging means for charging the photosensitive drum; developing means for developing a latent image formed on the photosensitive drum into a toner image; transfer means for transferring the toner image onto the recording material; fixing means for fixing the toner image on the recording material; a motor (161); a main assembly side gear (34) for receiving driving force from the motor; a hole (139A) formed substantially at a center of the gear, the hole having a polygonal cross-section; a projection (137A) provided at a longitudinal end of the photosensitive drum (107), wherein when the main assembly side gear (34) rotates with the hole (139A) and projection (137A) engaged with each other, rotational driving force is transmitted from the gear to the photosensitive drum through the hole and the projection with the projection being pulled into the hole, wherein an end portion (137A1) of a shaft having the projection and a surface (139A1) defining the hole are contacted to each other so that the process cartridge is positioned in place in a longitudinal direction of the photosensitive drum relative to the main assembly; and moving means for imparting relative movement between the hole and the projection in a longitudinal direction of the photosensitive drum to engage the projection with the hole. <IMAGE>