Automatic thread tightening device for a sewing machine

Details Automatic thread tightening device for a sewing machine Automatic thread tightening device for a sewing machine

1989-02-17

1990-01-09

Falik, Andrew M.

Sewing

Elements

Tensioning

D05B 4704

Patent

active

048920487

ABSTRACT:
A sewing machine having an upper thread supply, a main thread take-up lever and a needle, is provided with an automatic upper thread tension device for absorbing slackening of the upper thread during its supplying phase. The tension device includes a thread tension member arranged between the upper thread supply and the main thread take up lever to impart an adjustable pretension to the upper thread. A thread presser is arranged laterally of the path of the upper thread between the main thread take-up lever and the needle to guide the upper thread from the thread tension member to the main thread take-up lever and to clamp the upper thread and release the same during the predetermined supplying phase. An auxiliary thread take-up lever is arranged between the main take-up lever and the needle and cooperating with a thread guide to draw the slackened part of the upper thread against the guide during the supplying phase.

REFERENCES:
patent: 4328756 (1982-05-01), Boyd
patent: 4690083 (1987-09-01), Hara et al.
patent: 4702185 (1987-10-01), Hanyu et al.

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