Method and apparatus for aligning workpieces of variable lengths

Details Method and apparatus for aligning workpieces of variable lengths Method and apparatus for aligning workpieces of variable lengths

1988-08-04

1989-09-12

Schacher, Richard A.

Sheet feeding or delivering

Feeding

With means to align sheet

271176, 271182, 271259, 11212111, B65H 714

Patent

active

048653098

ABSTRACT:
Method and apparatus for feeding one or more fabric sections whose precise length is variable. The fabric sections are transferred to a delivery position, in which they are precisely centered, enabling uniform end margins to be realized notwithstanding length variability in the workpiece. As a workpiece is advanced on the shutter, its leading and trailing edges are sensed optically. A precise length determination is made by accumulating increments of lengths with a digital encoder. The leading edge of the workpiece is sensed at a delivery station, and the accumulated increment count is decremented at twice the rate of incrementation. When the accumulated count is reduced to zero, the workpiece is exactly centered in relation to a known position, and is engaged and held in that position while the shutter plate completes its transfer motion.

REFERENCES:
patent: 3741357 (1973-06-01), Krysink
patent: 4176832 (1979-12-01), Hughes
patent: 4682554 (1987-07-01), Goto

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