9Dec 22, 1999Sep 11, 2001Canon Kabushiki KaishaProcess cartridge and electrophotographic image forming apparatus having a main assembly in which a cartridge coupling member is engageable with a main assembly coupling member to receive a driving forceUS6311026 *Nov 12, 1999Oct 30, 2001Canon Kabushiki KaishaProcess cartridge and image forming apparatus including means for detecting mounting of the p