Importance

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Abstract

A system is disclosed for neutralizing the punching reaction forces in an open frame punch press in which inclined primary links mounted on the upper and lower frame members are stressed by linkage actuators during punching so as to counteract the punching reaction force. In one embodiment, a charging cylinder mounted to be acted on by the punch ram actuator generates hydraulic pressure used to operate linkage actuators. In that embodiment, the primary links are combined with secondary links to form toggle linkages to enable mechanical force multiplication of the force applied by the linkage actuators. In another embodiment the primary links converge and are pivotally connected at their rear ends to each other and a single secondary link, with a single cylinder at the forward end of one of the primary links, placing the primary links in tension during punching operations to neutralize the punching reaction forces acting on the press frame.

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First Claim