| 摘要 |
An approach sensor 2 is provided to give a signal to a control device, that is, CPU 1, when the approach sensor 2 detects an operator approaching a region predetermined in consideration of a region where a ram 20 is driven. The CPU 1 is operated in response to the signal from the approach sensor 2 to turn a relay 6 off, thereby to intercept the power supply to a servo motor 8 from a power source, wherein the servo motor 8 is controlled to return the ram 20 to an operation point when an instruction is given from an operating device 4 to turn the relay 6 on to supply the power to the servo motor 8 from the power source.
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