Dual purpose apparatus to manipulate workpieces

Details Dual purpose apparatus to manipulate workpieces Dual purpose apparatus to manipulate workpieces

1994-08-01

1995-11-21

Valenza, Joseph E.

Conveyors: power-driven

Conveyor for changing attitude of item relative to conveyed...

For changing both the elevation and the posture of...

198374, 1984682, 414226, 101 40, B65G 4724

Patent

active

054678641

ABSTRACT:
Workpieces are manipulated between the receiving position and the discharge position by supporting gripper arms on a platform mounted on a pivot shaft. The pivot shaft pivots between a position where a workpiece is gripped by gripper arms to a pivotal discharge position where the workpiece is released by the gripper arms. The pivot shaft is moved horizontally by a threaded adjusting screw toward and away from a vacuum chuck in a silk-screen printing machine to compensate for changes to the length of the workpiece to be carried by the vacuum chuck. This allows conveyors to remain at fixed elevations and merely change the site at which the workpieces are picked up in the case of a loading mechanism from a feed conveyor and the site where workpieces are deposited on a conveyor for an unloading operation. The pivot shaft carries pivot arms that in turn pivotally support swing arms that can be selective locked to prevent pivotal movement between the pivot arms and unlocked so that as the pivot arms pivots the swing arms rotate relative to the pivot arms.

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patent: 5249663 (1993-10-01), McCoy et al.
patent: 5333720 (1994-08-01), Zwigart et al.

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