| 摘要 |
PURPOSE:To suppress the abnormal rise of the rotating speed of a motor by interrupting a power source for a motor when the motor rotating speed signal is interrupted for the prescribed time or longer. CONSTITUTION:If a signal from a pulse generator 3 does not arrive at a circuit board side continuously for the prescribed time or longer, a pulse signal erasure detector 20 for setting a print start command to a mode setter 12 to as top command is provided. The same state as that a stop command is applied to the setter 12 by the output of the detector 20 is created, transistors Q1-Q4 are turned OFF, and the rotation of the motor 1 is stopped. |
