| 摘要 |
A vertical lift unit comprises a horizontally disposed upper plate adapted for suspension from a reciprocal shuttle feed unit, and a horizontally disposed lower plate adapted for supporting a reciprocal work piece gripping, lifting and transport assembly. A cylinder assembly is interposed between and interconnects the plates for effecting relative vertical movement therebetween. A series of bi-fold linkages are mounted quarter laterally in a rectangular pattern around the cylinder assembly and interposed between the plates and at their respective free ends pivotally connected to the plates for providing straight vertical lift motions to the work piece transport assembly. The bi-fold linkages are arranged in opposed spaced pairs, and a combination adjustable lock screw assembly and interconnected shock absorber assembly is interposed between one of said pairs of bi-fold linkages for selectively preadjusting the vertical work stroke of the lower plate and cushioning its downward movement.
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