| 摘要 |
PURPOSE:To improve work efficiency and economics of a machining center by realizing inclusion of a high-speed spindle in a program of the machining center. CONSTITUTION:After contact of a mobile terminal 9 with a fixed terminal 12, a switch 13 is operated while a return spring 10 is compressed. Further, the switch 13 is cut before the mobile terminal 9 and the fixed terminal 12 are opened by means of said spring 10. An input terminal of a high-speed spindle is released after input electric current is interrupted. Due to this, not only generation of arc at the time of intermittence of the input current is eliminated but also single- phase operation of the device can be well avoided, and high-frequency power source can be stably utilized. Accordingly, the high-speed spindle can be included in the program of the machining center. |
