| 摘要 |
PURPOSE:To suppress the abnormal rise of the rotating speed of a motor and to facilitate the restart of a power source by interrupting the source for a motor when the motor rotating speed signal is interrupted for the prescribed time or longer, and resetting the interruption of the source by a motor reverse rotation signal. 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. After the defective portion is repaired, the motor reverse rotation signal is input to the setter 12 and the detector 20. Then, the motor 1 is restarted in the reverse rotation state. |
