Stitch shortening and tacking assembly for blindstitch sewing ma

Details Stitch shortening and tacking assembly for blindstitch sewing ma Stitch shortening and tacking assembly for blindstitch sewing ma

1980-05-30

1982-01-26

Hunter, H. Hampton

Sewing

Stitch forming

Blind stitch

112315, D05B 2722

Patent

active

043122906

ABSTRACT:
This invention relates to a feed mechanism for a blindstitch sewing machine including a stitch shortening and tacking mechanism. Elliptical feeding movement is imparted to the feed dog by a fulcrumed lever driven off an eccentric on the main shaft of the machine. An operator controlled eccentric actuator is operatively connected to mechanism which changes the fulcrumed position of the feed lever to vary the elliptical path of the feed dog whereby effecting the advancement of the workpiece during the sewing operation without effecting needle reciprocation. An auxiliary thread tensioning assembly is provided to control the amount of thread utilized during the stitch tacking operation.

REFERENCES:
patent: 2333128 (1943-11-01), Stevenson
patent: 2763225 (1956-11-01), Mensching
patent: 4114547 (1978-09-01), Russell

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