| 摘要 |
<p>PNEUMATIC PRESS CONTROLLER AND METHOD A controller and method are provided for controlling pneumatic presses, and similar machines. The controller comprises a gauge to measure increments of stock length passing through the press, a length recorder to set the desired piece length, and a length comparator which compares the readout of the gauge with the preset recorder piece length, and when equal, generates a stroke initiate signal. The stroke initiate signal opens an air valve portion of the pneumatic press to communicate pressurized air with the power side of an air actuated ram, which in turn converges the press platens to perform the desired press function, such as punching holes, notching, cutoff, or the like. The controller also includes a timer to measure time beginning from the stroke initiate signal, a time recorder to set the time the air valve is to remain open, and a time comparator which compares the readout of the timer with the preset valve open time, and when equal, generates a stroke halt signal. The stroke halt signal closes the air valve to cease extension of the ram, and permit the platens to automatically diverge by means such as return springs, or the like. The stroke of the press is varied in accordance with each selected press operation and application to minimize press cycle time, and to increase production speed.</p> |
