Sewing – Elements – Frames
Patent
1976-07-15
1978-02-14
Hunter, H. Hampton
Sewing
Elements
Frames
D05B 312
Patent
active
040732525
ABSTRACT:
A pocket stitch is sewn on cut workpiece parts which are guided into operative association with a reciprocating needle which effects a straight stitch when it is reciprocated and also may be swung from side to side to effect a zig-zag stitching. The workpiece is guided so as to form at least one substantially U-shape straight stitch having spaced apart leg portions and the stitch is secured by guiding the workpiece to effect the formation of a barring stitch at the ends of each leg portion by causing the needle to form a zig-zag stitch at such location. The sewing machine for sewing the pocket cuts includes a needle bar which may be swung during the operation of the drive mechanism or the zig-zag control mechanism may be shifted to effect the formation of a straight stitch. A rotatable cam which is driven by the drive mechanism positions a clamping plate having a substantially U-shape slot which permits reciprocation of the needle through a workpiece carried thereon. The cam includes means for controlling the swinging of the needle to effect the zig-zag stitching and for controlling the straight stitching operation of the needle and it also has means for controlling the shifting of the workpiece to follow the outline. The device can also effect the formation of a double U-shaped stitch in which the U-shape portion is formed by two spaced apart straight stitches and a barring stitch is used at each end of the leg portions which is formed by a zig-zag stitch which is effected transversely to the straight stitches.
REFERENCES:
patent: 349358 (1896-09-01), Reece
patent: 3448705 (1969-06-01), Scherr et al.
patent: 3543737 (1970-12-01), Maschmann
patent: 3653347 (1972-04-01), Bianchi
patent: 3930454 (1976-01-01), Perlino
Dobner Reinhold
Hager Walter
Hunter H. Hampton
Pfaff Industriemaschinen GmbH
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