Method of and apparatus for the production of button-holes on a

Details Method of and apparatus for the production of button-holes on a Method of and apparatus for the production of button-holes on a

1977-10-27

1979-04-10

Hunter, H. Hampton

Sewing

Elements

Frames

112 65, 112255, D05B 306

Patent

active

041482689

ABSTRACT:
So-called raised buttonholes are sewn on a double-lock-stitch sewing machine with the fabric workpiece turned face down on the stitchplate of the sewing machine and the upper-thread tension being such that the interlocking loops of the upper and lower threads lie upon the downwardly facing side of the workpiece. According to the invention, the upper-thread tension at the end of a buttonhole-stitching cycle for the fastening stitch is increased above the lower-thread tension temporarily so that the interlocking loops of the upper and lower threads during this last fastening stitch lie within the thickness of the material or on the upper face of the downwardly turned workpiece.

REFERENCES:
patent: 3628480 (1971-12-01), Van Ness
patent: 3724409 (1973-04-01), Olney
patent: 3824938 (1974-07-01), Tolle
patent: 3877405 (1975-04-01), Dorosz et al.

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