Patent ID: 6240266
Filing Date: 2001-05-29
Classification: F16D,G03G

Abstract:
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 hole formed substantially at a center of said driving rotatable member, said hole 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 hole and projection engaged with each other, wherein a rotational driving force is transmitted from said driving rotatable member to said photosensitive drum through said hole and said projection with said projection being pulled into said hole, wherein an end portion of a shaft having said projection and a surface defining said hole are contacted to each other so that said electrophotographic photosensitive drum is positioned in place in a longitudinal direction of said electrophotographic photosensitive drum relative to the main assembly, and said shaft functions to rotatably support said photosensitive drum; andmoving means for imparting relative movement between said hole and said projection a longitudinal direction of said electrophotographic photosensitive drum to engage said projection with said hole.