| 摘要 |
PROBLEM TO BE SOLVED: To reduce attain size and weight of a device through reduction in size and weight of an inertial member such as a flywheel and increase in efficiency by specifying inertial mass of a rotary inertial member, rotating speed of a transmission gear and the tooth number of a first gear. SOLUTION: This device is provided with a driving shaft 35 to drive a photosensitive drum 2 in rotation, a flywheel 42 being a rotary inertial member connected to the driving shaft 35, a photoreceptor driving gear 41 being a first gear connected to the driving shaft 35 and a motor shaft gear 40 as a transmission gear to transmit driving force of a driving motor 38 to the driving shaft 35 by meshing with the photoreceptor driving gear 41. Inertial mass of the flywheel 42, rotating speed of the motor shaft gear 40 and the tooth number of the photoreceptor driving gear 41 are set so that respective frequencies of a speed change of the driving shaft 35 generated by meshing of the eccentric and photoreceptor driving gear 41 of the motor shaft gear 40 and the motor shaft gear 40 are restrained to an attenuation area in a frequency response of a driving transmission system. Size reduction and weight reduction in an inertial member can be attained, and vibration is not amplified. |
