| 摘要 |
<p>IMPROVEMENTS IN TEMPLATE BORING MACHINES, formed because they leave the platform fixed and the bit with an up and down movement, by means of a circuit with various multivibrators connected to one another by different relay sections, allowing movement of the rotating motors and lift and fall of the bit; automatic cycle repeat, by means of end of stroke micro-switches designed in the lift and fall motor; acoustic means coupled to warn of end of cycle, and time constant device, for automatic cycle performance, and adjustment of bit, by immovilizing the rotating motor of the bit, and lift movement of the bit to a maximum position, where it is set, returning to automatic performance when a hand switch is pressed.</p> |
