초록 ▼

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; t

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; a main assembly side gear for receiving driving force from the motor; a recess formed substantially at a center of the gear, the recess having a polygonal cross-section; a projection provided at a longitudinal end of the photosensitive drum, wherein when the main assembly side gear rotates with the recess and projection engaged with each other, rotational driving force is transmitted from the gear to the photosensitive drum through the recess and the projection with the projection being pulled into the recess, wherein a free end of the projection and a bottom surface of the recess 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 recess and the projection in a longitudinal.

대표청구항 ▼

1. An electrophotographic image forming apparatus for forming an image on a recording material, said apparatus comprising:an electrophotographic photosensitive drum; a charging unit arranged to charge said photosensitive drum; a developing unit arranged to develop a latent image formed on said photo

1. An electrophotographic image forming apparatus for forming an image on a recording material, said apparatus comprising:an electrophotographic photosensitive drum; a charging unit arranged to charge said photosensitive drum; a developing unit arranged to develop a latent image formed on said photosensitive drum into a toner image; a transfer unit arranged to transfer the toner image onto a recording material; a fixing unit arranged to fix the toner image on the recording material; a motor; a driving rotatable member arranged to receive a driving force from said motor; a projection portion provided substantially at a center of said driving rotatable member, said projection portion having a polygonal cross section; and a recess formed at a longitudinal end of said photosensitive drum, said recess having a polygonal cross section, wherein, when said driving rotatable member rotates with said recess and said projection portion engaged with each other, a rotational driving force is transmitted from said driving rotatable member to said photosensitive drum through said recess and said projection portion, with said recess being pulled into said projection portion, and wherein a free end of said projection portion and a bottom surface of said recess contact each other so that said photosensitive drum is positioned in place along a longitudinal direction relative to a main assembly.