| 摘要 |
PURPOSE:To simplify a mechanism, to reduce the number of parts and to simplify the assembly and the adjustment, by driving an exposure scan driving sytem and a variable magnification position controlling system selectively with the same driving source. CONSTITUTION:In the exposure scanning, a clutch 45 of a motor 38 rotates only a pulley 39, and a pulley 44 and a cam 50 are braked, and a wire part stretched between a fixed pulley 43 and the pulley 44 is fixed, and a supporting material 31 is moved to the right in a speed twice as high as the speed of a supporting material 32. When magnifications are varied, the clutch 45 rotates the pulley 44 and the cam 50 as one body, and the pulley 39 is braked, and a wire part stretched between fixed pulleys 37 and 40 is fixed, and only a movable pulley 34 is moved to the left to move mirrors 7 and 8 to the left for a length required for a prescribed variable magnification, and the cam 50 moves a lens 9 through a cam follower 49 to the right by a prescribed extent. |
