| 摘要 |
PROBLEM TO BE SOLVED: To prevent generation of gear sound noise by a method, wherein a part member to be driven by a stepping motor linked with a gear ring train is installed, periods when a current does not flow are formed between drive pulses for drive a stepping motor, and a state that the part member to be driven is intermittently driven are constituted. SOLUTION: The rotation of a stepping motor is decelerated by a gear ring train and delivered to a driving shaft. The stepping motor is subjected to intermittent driving, wherein intervals (a) when a current does not flow are formed between changing-over drive pulses P. Accordingly, a silent state is generated between sounds, although bounding sounds between gears exist. As a result, noise is not generated with respect in the acoustic sense. |
