Burns, Doane, Swecker & Mathis
Image forming apparatus having a plurality of developing devices
 Copying apparatus having a movable developing unit provided with a plurality of developing devices. This copying apparatus measures the mechanical characteristics of the drive mechanism driving the developing unit and determines if these characteristics deviate from normal values, and the drive signals transmitted to the drive mechanism are adjusted in accordance with the results of the measurement. 
Minolta Camera Kabushiki Kaisha
G
G03G
inventional
Hideo
Ito