| 摘要 |
A jam detecting device for detecting copy paper jamming occurring in an electrophotographic copying machine having a first circuit for detecting the presence of a copy paper which is ready to be fed into various processing stations, a second circuit for detecting the presence of the same copy paper at a position at which it is ready to be discharged out of the copying machine and a timer circuit for measuring the time interval between the detections by the first and second circuits and for producing, in the event the time interval exceeds a predetermined time, a signal indicative of a paper jam occurring in the machine. |
