| 摘要 |
<p>PROBLEM TO BE SOLVED: To judge whether a device is normal at a low cost and in a saved space and control properly by detecting the abnormality of a sensor based on the state of the output signal of the sensor before/after the position control of a paper feed roller. SOLUTION: When the position of a level sensor 23 is lowered by its coming off, the output signal of the level sensor 23 at the power source throw in time is in an off state, as the position of an actuator 22 before power source throw in time is more upper side than the level sensor 23. When the upper surface of the paper sheet is contacted with a nudger roller 21 at the power source throw in time, the on/off state of the output signal of the level sensor 23 is not switched but is in an off state alike the power source throw in time, as the actuator 22 is not lowered. While, when the upper surface of the paper sheet is not contacted with the nudger roller 21, the output signal of the level sensor 23 is switched into an on state when the actuator 22 is lowered upto the position of the level sensor 23, as the actuator 22 is lowered after a power source throw in time.</p> |
