Device for the automatic guiding of a workpiece on a sewing mach

Details Device for the automatic guiding of a workpiece on a sewing mach Device for the automatic guiding of a workpiece on a sewing mach

1980-04-28

1981-10-27

Hunter, H. Hampton

Sewing

Work manipulating

Guides

112308, 112315, D05B 3510

Patent

active

042967007

ABSTRACT:
A device for the automatic guiding of a workpiece on a sewing machine to produce a curved edge parallel seam operates in conjunction with a sewing machine having a reciprocating needle and a presser foot engageable with the workpiece and a feed member engageable with the workpiece to move it relative to the needle. The sewing machine also includes a guide roll disposed in spaced relationship to the needle for guiding the edge of the workpiece and a scanner for scanning the workpiece edge for sensing its position. In accordance with the position sensed, a plunger is mounted above the workpiece and is movable into the engagement with the workpiece to hold the workpiece at a selected point so as to turn the workpiece during the feeding movement of the workpiece by this feed member. A fluid pressure operated drive is connected to the plunger so as to engage it with the workpiece and the operation thereof is dependent upon a second fluid pressure drive which varies the operation of a stitch length setting mechanism which includes a stitch length setting bar which is movable to change the length of the feeding movement of the feed member.

REFERENCES:
patent: 3080836 (1963-03-01), Clemens et al.
patent: 3954071 (1976-05-01), Mall et al.
patent: 4131076 (1978-12-01), Johnson
patent: 4135460 (1979-01-01), Biotteau

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