An image forming apparatus includes a cartridge detachably mountable to the image forming apparatus, the cartridge including a movable image bearing member; a charging member having a contact member for contacting to the image bearing member in the cartridge to charge the image bearing member, the contact...http://www.google.es/patents/US5095335?utm_source=gb-gplus-sharePatente US5095335 - Copier with retractable charging unit to prevent damage to drum when removing process cartridge
Copier with retractable charging unit to prevent damage to drum when ...
