Patent ID: 6298202
Filing Date: 2001-10-02
Classification: G03G

Abstract:
An image forming apparatus comprising:a replacement unit having a projection which moves from a first position to a second position, and once moved to said second position being prohibited from returning to said first position, a moving member which moves said projection from said first position to said second position, a drive mechanism which moves said moving member to move said projection in conjunction with a driving of elements used in association with image formation, and a first replacement unit including a development roller and a second replacement unit including a photoreceptor, said first replacement unit and said second replacement unit being separable, said photoreceptor comprising said elements used in association with image formation;a sensor which detects a position of said projection; anda controller which judges whether or not said replacement unit is a new replacement unit based upon respective positions of said projection detected by said sensor before and after said drive mechanism is driven.