Sewing machine automatic thread tension device with thread elong

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

1988-06-27

1990-10-02

Falik, Andrew M.

Sewing

Elements

Tensioning

D05B 4704

Patent

active

049600621

ABSTRACT:
A sewing machine includes an automatic thread tension adjusting device comprising an upper thread tension member arranged in an a thread running path between an upper thread source and a main thread take-up lever. An auxiliary thread take-up lever is arranged in the upper thread running path between the main thread take-up lever and a needle holding the upper thread. A thread engaging part guides the upper thread. A thread presser is arranged laterally of the upper thread running path between the main and auxiliary thread take-up levers and normally clamps the upper thread. A detector detects a predetermined rotation phase of a drive shaft of the machine and thread elongation, respectively, and generates respective electric signals. A control circuit causes the thread presser to release the upper thread in response to the electric signals generated by the detector.

REFERENCES:
patent: 4377980 (1983-03-01), Hanyu et al.
patent: 4700644 (1987-10-01), Eguchi et al.
patent: 4702185 (1987-10-01), Hanyu et al.
patent: 4793723 (1988-12-01), Hara et al.

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