| 摘要 |
PURPOSE:To reduce electric power consumption by additionally providing an automatic stop circuit having a detecting means to directly or indirectly detect the function of an automatic finishing up means and a switch moans to break a driving circuit for a main shaft motor in response to a detection signal issued from the detecting means. CONSTITUTION:When threading work is started, a power switch SM is turned ON to reset FF129, and an automatic stop circuit is set into a preparatory state for its functioning. When a fixed threading work approaches its end, the tip of a pipe 100 begins to push the lower end 53 of a finishing up lever 23, and at the end of the threading work, a stopper pin 55 gets out of a hole of a slider 43. When the completion of the threading work is detected, and the first switch S1 is closed, FF129 is set, and a relay 124 is thereby made to function through a transistor 127 to open a relay contact 123. Thus a power circuit 121 is broken to automatically stop a motor M. |
