Patent ID: 7386241

Claim:
A process cartridge detachably mountable to a main assembly of an electrophotographic image forming apparatus for forming an image on a recording material, said process cartridge comprising: an electrophotographic photosensitive drum; a drum shaft configured and positioned to be rotated by a driving force supplied from the main assembly of the apparatus and to transmit a rotating force to said electrophotographic photosensitive drum; and an indicator, movably provided on said drum shaft, configured and positioned to indicate when said process cartridge is mounted to said main assembly of the apparatus, that said process cartridge has reached at least a state that said process cartridge has been used for image formation, wherein when the main assembly of the apparatus detects that said process cartridge has reached the state, said drum shaft is rotated in a direction opposite to a rotational direction for the image formation to activate said indicator.