Electrophotographic image forming apparatus including a cartridge mounting feature

An electrophotographic image forming apparatus for forming an image on a recording material, comprising:

• an electrophotographic photosensitive drum;
• a cartridge including a developing roller for developing an electrostatic latent image formed on said electrophotographic photosensitive drum, said cartridge containing a developer for effecting development;
• and
• an urging member for urging said cartridge;
• a transfer member for transferring a developed image formed on said electrophotographic photosensitive drum onto the recording material;
• and
• an image forming unit, including said electrophotographic photosensitive drum and said transfer member, for detachably mounting said cartridge,
• wherein said image forming unit is movable between an image forming position for effecting image formation and a mounting and demounting position where said cartridge is mountable and demountable, wherein said urging member urges said developing roller to said electrophotographic photosensitive drum by applying a force to said cartridge and prevents dismounting, at the time when said image forming unit moves between the image forming position and the mounting and demounting position, of said cartridge out of said image forming unit by applying the force to said member cartridge, and wherein said image forming unit is rotatable between the image forming position and the mounting and demounting position.