| 摘要 |
A sheet transport control method for deciding whether or not the transport of a sheet in a copier and other is normal. Sheet feed sensors, a registration sensor, a separation sensor, a fixation sensor, a discharge sensor and others each being responsive to the ends of a sheet are provided. The actual timing of passage of a sheet sensed by one of the sensors is compared with a reference timing, and the resulting increment or decrement in timing is fed back to the reference timings which are respectively, assigned to each of the other sensors that are located downstream of that one sensor. This prevents the deviation in timing from being sequentially accumulated from the upstream sensor to the downstream sensor. When the sum of the increments and decrements exceeds a predetermined value, an alarm is produced for alerting a person to such an occurrence.
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