Electrophotographic image forming apparatus and process cartridge detachably mountable thereto comprising a positioning portion for engagement with a positioning member of a main assembly of the image forming apparatus

Abstract

A process cartridge detachably mountable to a main assembly of an electrophotographic image forming apparatus, includes an electrophotographic photosensitive member; a process device actable on the photosensitive member; a frame for supporting at least the photosensitive member; a positioning portion, provided on the frame coaxially with the photosensitive member, for engagement with a positioning member of the main assembly of the apparatus; and a driving force receiving member, disposed at the positioning portion, for receiving a driving force from a driving force transmission member supported rotatably on the positioning member of the main assembly of the apparatus. The receiving member includes a first hole portion for engagement with a first projection of the transmission member, the hole portion being concentric with the photosensitive member when the process cartridge is mounted to the main assembly of the apparatus, and further includes a plurality of hole portions for driving force transmission, the plurality of second hole portions being arranged radially from the first hole portion to be engageable with second projections of the transmission member for driving force transmission, when the process cartridge is mounted to the main assembly of the apparatus.