Patent ID: 7457566
Filing Date: 2008-11-25
Classification: F16D,G03G

Abstract:
1. An electrophotographic photosensitive drum usable with an electrophotographic image forming apparatus, comprising: a non-circular twisted projection having a cross-section with a plurality of corner portions, said non-circular twisted projection being provided at one longitudinal end of said electrophotographic photosensitive drum, and being engageable with a non-circular twisted hole having a cross-section with a plurality of corner portions, the non-circular twisted hole being disposed at the central portion of a driving rotatable member of a main assembly of the image forming apparatus; and a drum electroconductive member provided on said non-circular twisted projection and being electrically connected with said electrophotographic photosensitive drum, said drum electroconductive member being contactable with a main-assembly electroconductive member electrically connected with the main assembly of the image forming apparatus, the main-assembly electroconductive member being disposed in the hole to ground said electrophotographic photosensitive drum, said drum electroconductive member having a first contact portion and a second contact portion, wherein when said non-circular twisted projection is engaged with the hole, said first contact portion contacts the main-assembly electroconductive member on a rotational axis of said electrophotographic photosensitive drum and does not move in a direction crossing a direction in which said non-circular twisted projection is moved into the hole, and said second contact portion contacts the main-assembly electroconductive member and moves in a direction crossing the direction in which said non-circular twisted projection is moved into the hole in interrelation with said non-circular twisted projection being moved toward the hole by rotation of the driving rotatable member.