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 developing device 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 position of the developing device is detected, and the detected position is compared with a datum of a target movement scheme predetermined for the developing apparatus. A driving motor for the apparatus is controlled to correct the difference therebetween which is the result of the comparison. 
Canon Kabushiki Kaisha
G G G
G03G G03G G03G
inventional inventional additional
Yasushi Kazuhiko Kimiyoshi Akio
Murayama Hirooka Hayashi Ohno