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; a main assembly side gear for receiving driving force from the motor; a twisted hole formed substantially at a center of the gear, the hole having a polygonal cross-section; a twisted prism projection provided at a longitudinal end of the photosensitive drum, wherein when the main assembly side gear rotates with the hole and projection 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; and a moving device for imparting relative movement between the hole and the projection in a longitudinal direction of the photosensitive drum.

대표청구항 ▼

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

[ What is claimed is:] [1.] An electrophotographic image forming apparatus for forming an image on a recording material, comprising:an electrophotographic photosensitive drum;charging means for charging said electrophotographic photosensitive drum;developing means for developing a latent image formed on said electrophotographic photosensitive drum into a toner image;transfer means for transferring the toner image formed by said developing means from said electrophotographic photosensitive drum onto said recording material;fixing means for fixing the toner image transferred onto the recording material by said transfer means on the recording material;a motor;a driving rotatable member for transmitting a rotational driving force from said motor;wherein said driving rotatable member has formed therein a twisted hole at a central portion thereof having a non-circular cross-section with a plurality of corner portions; anda twisted projection provided at a longitudinal end of said electrophotographic photosensitive drum and having a non-circular cross-section with a plurality of corner portions, said twisted projection being engageable with the twisted hole,wherein the rotational driving force is transmitted to said electrophotographic photosensitive drum by engagement between the twisted hole and twisted projection, and wherein said twisted projection is urged toward said twisted hole when said driving rotatable member is rotated with said twisted projection being in engagement with the twisted hole.