| 摘要 |
<p>Exposure mechanism is for point source copiers, printing plate prodn. equipment, plan prodn. in blue print copiers etc. The unit is motorised shutter assembly over a lamp (16) and reflector (14). The latter are covered by two shutter blades (22, 24) controlled by a motor driving a toothed wheel (38). For exposure the motor directly drives one shutter blade (22) and opens the other by means of slip coupling between pivots (22, 24) and a drive direction reversal mechanism (32) with pulleys.</p> |
