Method of automatically controlling upper thread tension in a se

Details Method of automatically controlling upper thread tension in a se Method of automatically controlling upper thread tension in a se

1988-06-22

1991-03-12

Falik, Andrew M.

Sewing

Elements

Frames

112243, 112255, D05B 4900

Patent

active

049984918

ABSTRACT:
A method of automatically controlling thread tension in a sewing machine according to which a first thread tension device is provided between an upper thread source and a thread take-up lever, and a second thread tension device is provided between the first tension device and the thread take-up lever. The first thread tension device is operated to apply a constant pressure to the upper thread such that the thread take-up lever is able to draw out the upper thread upon moving upward. The second thread tension device is operated to fixedly hold the upper thread until the thread take-up lever moves upward to an upper dead point thereof through a lower dead point thereof, at which the take-up lever moves downward to supply the upper thread to the needle. The second thread tension device is further operated to effect release of the upper thread when the thread take-up lever reaches the upper dead point thereof and until the thread take-up lever moves downward to a thread supply starting position thereof.

REFERENCES:
patent: 4340003 (1982-07-01), Hanyu et al.
patent: 4408554 (1983-10-01), Takiguchi et al.
patent: 4616583 (1986-10-01), Takano et al.
patent: 4690083 (1987-09-01), Hara et al.
patent: 4791876 (1988-12-01), Sasaki et al.

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