| 摘要 |
PURPOSE:To exactly detect the abnormality in paper feeding by a method in which the first pulse signal corresponding to the revolving number of motor and the second pulse signal of clock pulse are put in an incremental decremental counter, and on the basis of the count values, the normality or anomaly of paper sending is judged. CONSTITUTION:In making a power source, the initial value of an incremental/ decremental counter 14 is set up by a comparison reference count value circuit 15. When a desired speed is set up by a speed setting circuit 11, the output of a reference pulse oscillator 9 is divided by a divider 10 and sent out as a pulse signal. In case a DC motor 3 is stopped due to the blocking of paper, pulse signal from a photocoupler 8 disappears and only pulse signal from the divider 10 is applied to the counter 14. The count values can thus be counted and anomaly signal of paper feeding is sent out at a time when a comparison reference value is exceeded in a monitor 17, and the power source circuit 20 of the DC motor 3 is turned OFF. |
