| 摘要 |
PURPOSE:To enable exact synchronous drive of optical scanning means and a photoreceptor in any magnification, by selectively connecting an inertial load corresponding to a selected magnification, to one of said means and the photoreceptor not changed in speed when magnification is changed. CONSTITUTION:Fly wheels 53, 54 are installed on a shaft 48, and the flywheel 53 has a mass corresponding to a unimagnification, and 54 has a mass corresponding to a contracting magnification. The wheel 54 is larger in mass, the wheels 53, 54 connected with electromagnetic clutches 51, 52, respectively, are to be united with a photoreceptor into one body, respectively, thus permitting the difference between the 2 wheels 54, 53 in inertial load to corresond to the difference between mirrors 2, 3 in inertial energy due to the difference in mirror speed for copying of size reduction or non changing, therefore, synchronization of movement of the mirrors 2, 3 driven with the same motor 33 and rotation of a photoreceptor 7 to be exactly ensured. |
