Sewing machine with an automatic thread tension device

Details Sewing machine with an automatic thread tension device Sewing machine with an automatic thread tension device

1986-06-30

1987-10-27

Nerbun, Peter

Sewing

Elements

Tensioning

112453, D05B 4704

Patent

active

047021853

ABSTRACT:
This invention makes a proper calculation to an amount of supplying a lower thread to be required to forming of a stitch with stitching information in relation with changing of a needle dropping position from a preceding stitch to a present stitching, so that the lower thread is forcibly drawn out in accordance with said calculation, and makes a proper calculation to tension of an upper thread optimum to forming of a stitch with stitching information so as to determine the optimum upper thread tension in accordance with said calculation, or makes a calculation to the amount of supplying the upper thread optimum to forming of a stitch with stitching information so as to draw out the upper thread in accordance with said calculation.

REFERENCES:
patent: 4301757 (1981-11-01), Tonomura
patent: 4377980 (1983-03-01), Hanyu et al.
patent: 4466368 (1984-08-01), Hanyu et al.

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