| 摘要 |
<p>An impact press includes drive means for reciprocating a sleeve at one end of which a ram is slidably and rotatably carried, the same being normally held in a retracted position by retaining means. The drive means that reciprocates the sleeve toward and away from impact tooling also regulates in synchronization therewith a releasing means by which the retaining means lets go of the ram to permit it to fly under the influence of a bias until it impacts the tooling. Reaction from the tooling after the punching has been completed provides a force for receiving the ram in the sleeve. If desired, the driving means can also be used to regulate the operation of a workpiece feeder, a workpiece brake, and any regulator that the impact tooling may have, all in synchronization with the movements of the sleeve. If a conventional air feeder is used, owing to limitations of the feeder, the device can be operated at 180 strokes per minute. Without such feeder smaller workpieces can be made or modified at the rate of 500 strokes per minute.</p> |
