| 摘要 |
Driving gears(31,33), which rotate inversly to the power transfer shaft of the main shaft(5), are established on the feed gear shaft(3) . A clutch(36) is made between the gears and driven by a solenoid(40) . This clutch changes the rotating direction of the feed gear shaft. A feeding plate(13), which has a vise(50) for a thread cutting bite, is assembled with the shaft(3). A circular plate, which has a hollowed portion(42'), is assembled at the end of the subordinate shaft(7). A guide bar(43) slides the surface of the plate. An electromagnet is made in the guide hole(9), which moves on the plate(10) by a chain(11), and is driven by a microswitch, which is contacted on the projected piece(84) of the shaft (7).
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