| 摘要 |
A device for controlling the feed mechanism for copying material is connected to a coupling at the feed mechanism of the copying material in order to ensure that the respective leading edges of an original and the copying material are fed to a copying zone in congruence irrespective of the throughput speed. For easy adjustment this device is built up with a pulse generator in synchronism with the movement of the original feed mechanism and with a pulse counter the output of which is connected to the coupling. The counter counts the number of pulses in a predetermined period of time and stores this number. Further, the counter counts a second number of pulses occurring after the predetermined period and produces an output signal when the second number of pulses is equal to a predetermined number of pulses less the stored count. |
