| 摘要 |
PURPOSE:To eliminate the use of a cam having a complicated form, by turning a driving motor for variable magnification by a prescribed extent in the direction corresponding to each mode when the displacement mode is selected between the reduction and the magnification and then turning a driving pulley for variable magnification lens. CONSTITUTION:A driving pulley 30 for variable magnification mirror and a displacing pulley 12 for variable magnification mirror are provided coaxially and in one body with a driving pulley 12 for variable magnification lens and a scanner displacing pulley 26 respectively. A driving wire 32 for variable mirror is hung over these pulleys, and a lens 5 plus mirrors 3 and 4 are displaced at same time by a driving motor 15 for variable magnification. The stoppers 37, 38 and 39 which engage to an engaging projection 36 provided at a part of the pulley 31 are set displaceably between the engaging position and the shunting position. As a result, the pulley 31 is positioned at a prescribed rotating position in response to each mode of the unmagnification, magnification and reduction. |
