| 摘要 |
PURPOSE:To permit copying without the appearance of the shadow of grippers on specified copying paper by providing a photographing optical system that can be changed over to specified projection magnifications and projection magnifications smaller than the specified ones and a gripper margin switch which operates this changing over. CONSTITUTION:A projecting lens is interchanged properly, and as it moves on the optical axis in an arrow A direction, the magnification of projection is changed. The projecting optical path length of this time is adjusted by the movement of mirrors 6, 7 integrally in an arrow B direction. The exchanging of the projecting lens is accomplished by an electrical driving device 21 for interchanging of projecting lenses and the lens is moved on the optical axis by an electrical driving device 22 for adjusting the projecting lens. The mirrors 6, 7 are moved by an electrical driving device 23 for adjusting optical path length. All these are controlled by a controller 24. The signals from an original size selection switch 25 and a gripper margin switch 26 are inputted to the controller 24, and the devices 21-23 are so controlled that the magnification of the projecting optical system attains the prescribed value. |
