Driving force receiving member, shaft coupling, toner image bearing member, process cartridge and electrophotographic image forming apparatus

摘要

An electrophotographic image forming apparatus to which a process cartridge is detachably mounted and which is adapted to form an image on a recording medium includes an electrophotographic photosensitive drum, a mounting device capable of detachably mounting a process cartridge including a process device acting on the electrophotographic photosensitive drum and a shaft coupling member secured to a drum support shaft for supporting the electrophotographic photosensitive drum. A shaft coupling member of an apparatus body is adapted to be engaged by and disengaged from the shaft coupling member of the process cartridge. The shaft coupling member of the apparatus body includes either of one shaft coupling member including a cylindrical projection coaxial with a rotation center, and transmitting force transmitting or receiving projections disposed around the cylindrical projection and protruding in the same direction as the cylindrical projection and having inclined surfaces with a tip end lead directing toward a rotational direction, or another shaft coupling member including a cylindrical hole to be fitted onto the cylindrical projection to effect centering, and holes to be fitted onto the transmitting force transmitting or receiving projections and disposed around the cylindrical hole and having inclined surfaces to be contacted with the inclined surfaces of the transmitting force transmitting or receiving projections.