An image forming apparatus having a cartridge includes an image forming device acting on an image bearing member and a driving force transmitting device which is adapted to transmit a driving force from an apparatus side to a cartyridge side and which is separable from the image forming device. The apparatus...http://www.google.com/patents/US5528343?utm_source=gb-gplus-sharePatent US5528343 - Driving cartridge for an image forming apparatus
