5,472,077 to Bolin, shows retraction of a pusher arm in a raised position through use of a controller and electric motors. 5,733,100 that issued to Slat et al., a pusher bar of a palletizing machine for cylindrical objects is disclosed as being raised during re-positioning by a cylindrical piston. 4,711,612 to Kwauka, a retracting pusher bar is raised during retraction by a complex piston assembly. The pusher bar is retracted from a position over the pallet back to a start position by complex piston cylinder units that raise the pusher or sweep bar over incoming books that are next pushed by the sweep bar. 4,614,473 to Kwauka et al., a palletizing machine is disclosed that includes a pusher bar for pushing rectangular objects, such as books or boxes, onto a pallet. B65G57/035- Stacking of articles by adding to the top of the stack from above with a stepwise downward movement of the stackĮfforts persist to improve palletizing machines to thereby minimize the cost of materials and manufacture for such machines, and to minimize labor costs to build and operate such machines.B65G57/03- Stacking of articles by adding to the top of the stack from above. cubiform, cylindrical in layers each of predetermined arrangement
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