Patent ID: 9042784
Filing Date: 2015-05-26
Classification: G03G

Abstract:
1. A rotating-body driving device comprising: a rotating body; a driving source that generates a driving force for rotating the rotating body; a reduction gear that includes an output shaft connected to the rotating body and a gear rotating at a non-integer ratio of rotation period to a rotation period of the output shaft, and the reduction gear reducing rotation speed of the driving source with the gear and transmitting the driving force to the rotating body via the output shaft; a pulse-signal generating unit that generates a pulse signal associated with a rotational amount of the output shaft of the reduction gear; a pulse-count storage unit that accumulates and stores therein the number of pulse signals generated by the pulse-signal generating unit; a speed-fluctuation storage unit that stores therein a rotation speed fluctuation of the output shaft occurring every rotation period of the reduction gear as speed fluctuation information associated with the number of pulse signals; and a driving-source control unit that controls the driving source, wherein the driving-source control unit detects the speed fluctuation information of the reduction gear associated with the accumulated number of pulse signals from the speed-fluctuation storage unit on the basis of the accumulated number of pulse signals stored in the pulse-count storage unit, and performs for the driving source a feedforward control using the speed fluctuation information to set off the rotation speed fluctuation.