| 摘要 |
PURPOSE:To adjust the quantity of light to which photosensitive paper is exposed and take a proper copy by providing a control circuit which adjusts the feed speed of an original and a form consisting of photosensitive paper according to the electric signal of a sensor which outputs the electric signal according to the quantity of transmitted light. CONSTITUTION:The sensor 8 receives the transmitted light 2a of the original 1 or the transmitted light 2b of the original 1 and photosensitive paper 3 and outputs the electric signal according to the quantity of transmitted light. A sampling circuit part 9 set the measurement period of the outputted electric signal and measures its electric output, i.e. the quantity of transmitted light 2a or 2b. A sample/hold circuit part 13 sets and holds a motor speed to a constant form feed speed according to timing pulses of the sampling circuit part 9. A smoothing circuit and gain adjusting circuit part 14 sets a level by adjusting the gain through a variable resistor according to the sensitivity and thickness of the photosensitive paper or when the coloring state of the photosensitive paper is to be varied. A motor driving circuit 15 operates a form feeding motor at the indicated speed.
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