Method of changing workpiece holders for press machine

Details Method of changing workpiece holders for press machine Method of changing workpiece holders for press machine

1987-11-25

1990-11-20

Crane, Daniel C.

Metal deforming

By plural tool-couples

With means to feed work between plural tool stations

72422, B21D 4300, B21D 3704, B21J 1308

Patent

active

049708880

ABSTRACT:
A press machine includes at least one mobile bolster movable with respect to the press machine, a plurality of die assemblies mounted on the mobile bolster and arranged in a row at equal intervals, a plurality of handling bars for transferring a plurality of workpieces successively through the die assemblies, one or more workpiece holders detachably mounted on each of the handling bars for holding the workpieces, feed bars for moving the handling bars, lifting/lower units for vertically moving the feed bars, and handling bar gripping devices for gripping the handling bars. A method of changing the workpiece holders comprises the steps of gripping the handling bars with the handling bar gripping devices, releasing the feed bars from the handling bars, elevating the feed bars beyond the die assemblies with the lifting/lowering units, moving the mobile bolster out of the press machine, and detaching the workpiece holders from the handling bars and replacing the workpiece holders with new workpiece holders.

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