| 摘要 |
PURPOSE:To prevent malfunction and damage of circuit parts due to eddy current by providing a means for turning on or off a power supply of an actuator accompanied by operation of a switch for controlling switching of the actuator. CONSTITUTION:A drive circuit 33 which supplies drive current to actuators 27 and 28 is constituted to be switched to a drive state and a non-drive state by operation of a switch 26. Also, a circuit switching means 38 is provided to switch the power supply current to a supply state and a stop state for the actuators 27 and 28 accompanied by switching operation of the switch 26. Therefore, when the switch 26 is set to OFF state, the circuit switching means 38 stops supply of the power supply current to the actuators 27 and 28. Thus, even if the drive circuit 33 results in conduction failure due to short-circuiting failure of connection wiring for the actuators 27 and 28 in reference to a machine body, no current can be supplied to the actuators, thus preventing malfunction of the actuators 27 and 28 regardless of conduction failure of a final drive part and preventing damage to circuit parts. |
