| 摘要 |
PURPOSE:To increase the speed of copying by stopping a cylindrical light shield body for the time to be preset according to the contrast of the original and the film sensitivity of photosensitive sheet and giving exposure at the time of exposure. CONSTITUTION:A tubular ligh source 8 is provided with a reflecting plate 13 and a cylindrical light shield body 12. The light shield body is formed with an opening 22 and is driven by a cam 19 and guide rails 23, 24. Now when a main switch is turned where a top cover 4 is held open, the light source 8 and pilot lamp go ON but the machine does not move. When the light emission of the light source 8 stabilizes and the top cover 4 is closed, the opening 22 rotates and faces toward a glass plate 7, then the photosensitive sheet is exposed and the light shield body 12 is turned by the preset timer to end one time of copying. When the operator opens the cover 4, exchanges the photosensitive sheet and recloses the upper cover 4, a counter is reset and copying is done. At the time of exchanging, the start for redriving is done after the completion of the exchanging has been confirmed. |
