Patent ID: 6067886
Filing Date: 2000-05-30
Classification: B26D,B30B,Y10T

Abstract:
A trim press, comprising:a stationary support structure including a stationary platen, a support frame, and a plurality of guideposts rigidly secured between the stationary platen and the support frame;a movable platen supported between the stationary platen and the support frame and configured for guided axial reciprocating movement along at least two of the guideposts;a drive train assembly carried by the support frame in spaced-apart relation with the at least two guideposts and including a drive motor, a drive shaft extending centrally of the support frame, a pair of output shafts extending transversely to the drive shaft, and a pair of transfer cases, each connected between the drive shaft and one of the output shafts;a plurality of crank arm assemblies, each crank arm assembly connected between one corner of the movable platen and one of the output shafts; anda counterbalance assembly carried by the support frame and including a first pair of rotating counterbalance weights mounted eccentrically on one of the output shafts on either side of one of the transfer cases and a second pair of rotating counterbalance weights mounted eccentrically on the other of the output shafts on either side of another of the transfer cases;wherein the drive train assembly and crank arm assemblies cooperate to drive the movable platen in reciprocation while the first and second pair of counterbalance weights are driven in counter-rotation so as to counterbalance the moving platen and crank arm assemblies and substantially counterbalance each other in directions off-axis to the moving platen.