| 摘要 |
PURPOSE:To set an optical system accurately at a desired magnification by providing control parts which set a desired magnification, detect the leading end of photosensitive paper, determine the moving positions of a projecting lens and a reflecting mirror, and determine the transfer position of the photosensitive paper based on the output detecting the leading end of the photosensitive paper. CONSTITUTION:After a magnification is set with a rotary dial 44, a print switch 41 is operated. When the content of an addition-subtraction counter CT1 and the content of an addition-subtraction counter CT2 coincide, a step motor 36 is stopped, by which a projecting lens is set in the position of the prescribed magnification and the transfer of photosensitive paper is started by a motor 38. By the detection output of a leading end detector 31, the pulses from a pulse generator G2 are applied to a subtraction counter CT4, and are subtracted. When they go to a zero, a subtraction counter CT3 is started. The counter CT3 subtracts the pulses from the preset correction value by driving pulses, and if the pulses go to a 0, the counter delivers a carry signal, thereby turning a driver DR2 off and stopping a motor SM2 |
