| 摘要 |
PURPOSE:To readily and surely detect the abnormality of the sequence-controlled copying machine by detecting abnormality depending upon the state of an original scanning detecting switch at the specified timer time, the operation and generating condition of copying machine control pulses. CONSTITUTION:When a print switch 14 is closed, the first timer 10A of a microcomputer 10 starts and the original scanning table moves, causing an original scanning detecting switch to operate. Depending upon whether this operation was accomplished before the timer times out or not, a computer 10 decides the presence or not of the abnormality at the scanning system. When it is decided by flag check or the like that there is no abnormality, the second timer 10B is set upon timing out of the timer 10A. If the control pulse which has optically detected the revolution of a copying machine drive motor 1 of a period shorter than the timer period of the timer 10B within its timer period is generated within its timer period, it is decided that there is no abnormality. |
