Welt feeder for sewing machines

Details Welt feeder for sewing machines Welt feeder for sewing machines

1980-02-01

1981-07-07

Nerbun, Peter P.

Sewing

Work manipulating

Guides

112277, D05B 3506, D05B 6920

Patent

active

042768373

ABSTRACT:
A device for feeding to a sewing machine a strip of fabric, in particular a longitudinally folded band to serve as a pocket welt, comprises a generally oval-shaped guide mountable on the sewing-machine base and provided with sides shaped as U-profiles and with a tongue at an output end for folding a fabric strip upon passage thereof along a feed path to a sewing station at the machine. A beam of light from a gallium-arsenide source traverses the feed path in the region of the tongue to energize a photocell upon passage of a workpiece, the photocell being connected to a stitch counter for activating the same upon energization by the source. The guide has a length scale with graduations spaced in the direction of the feed path for implementing the manual positioning of a fabric strip prior to the feeding thereof to the sewing station, while the stitch counter is operationally coupled to the reciprocating sewing-needle drive to arrest the same upon counting a predetermined number of stitches. The positioning of a fabric strip via the scale and the automatic stopping of the sewing-machine drive by the photocell-activated counter ensure a precise positioning of a final stitch relative to a sewn welt.

REFERENCES:
patent: 2840020 (1958-06-01), Wise
patent: 3334603 (1967-08-01), Boser et al.
patent: 4112860 (1978-09-01), Ellington et al.
patent: 4160424 (1979-07-01), Newell et al.

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