초록 ▼

An electrophotographic image forming apparatus for forming an image on a recording material includes an electrophotographic photosensitive drum, a charging device for charging the photosensitive drum, a developing device for developing a latent image formed on the photosensitive drum into a toner im

An electrophotographic image forming apparatus for forming an image on a recording material includes an electrophotographic photosensitive drum, a charging device for charging the photosensitive drum, a developing device for developing a latent image formed on the photosensitive drum into a toner image, a transfer device for transferring the toner image onto the recording material, a fixing device for fixing the toner image on the recording material, a motor, and a main assembly side gear for receiving driving force from the motor. A recess is formed substantially at a center of the gear, the recess having a polygonal cross-section, and a projection is 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. A moving device imparts relative movement between the recess and the projection in a longitudinal direction of the photosensitive drum to engage the projection with the recess.

대표청구항 ▼

[ What is claimed is:] [1.]1. An electrophotographic image forming apparatus for forming an image on a recording material, comprising:an electrophotographic photosensitive drum;charging means for charging said photosensitive drum;developing means for developing a latent image formed on said photosen

[ What is claimed is:] [1.]1. An electrophotographic image forming apparatus for forming an image on a recording material, comprising:an electrophotographic photosensitive drum;charging means for charging said photosensitive drum;developing means for developing a latent image formed on said 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 driving rotatable member for receiving a driving force from said motor;a recess formed substantially at a center of said rotatable member, said recess having a polygonal cross-section;a projection provided at a longitudinal end of said photosensitive drum, wherein when said driving rotatable member rotates with said recess and projection engaged with each other, a rotational driving force is transmitted from said rotatable member to said photosensitive drum through said recess and said projection with said projection being pulled into said recess, wherein a free end of said projection and a bottom surface of said recess contact each other so that said photosensitive drum is positioned in place in a longitudinal direction of said photosensitive drum relative to the main assembly.