Fitzpatrick, Cella, Harper & Scinto
Color image forming apparatus
 A color image forming apparatus wherein a plurality of developing devices or units are supported on a supporting member or turret which is rotatable to revolve the developing devices to move a desired one of the developing devices to a developing station where the developing operation is effected with the desired one of the developing devices so that a color image is formed. The presence, absence or the amount of the developer within the developing devices are detected. When the detection indicates that the toner is to be supplied into a developing device, the developing device is moved to a predetermined developer supplying position, and then is stopped so that the developing device is supplied with the developer at the developer supplying position. 
Canon Kabushiki Kaisha
G G G
G03G G03G G03G
inventional inventional inventional
Kenji Shinichi Kenji Kiyoharu Akio Yusaku
Yoshinaga Oguri Takeda Tanaka Ohno Takada