Upper thread supplying device in sewing machine

Details Upper thread supplying device in sewing machine Upper thread supplying device in sewing machine

1989-10-26

1991-06-11

Nerbun, Peter

Sewing

Elements

Tensioning

112302, 112453, 1122621, D05B 4704

Patent

active

050223356

ABSTRACT:
An upper thread carried by a vertically reciprocating needle is drawn from a bobbin through a tensioning device, a supply device and a take-up lever. A predetermined amount of the upper thread is first supplied by actuating the supply device, while applying no tension thereto. An additional amount of the upper thread is then supplied by operation of the take-up lever with a predetermined tension being given thereto. The additional amount is detected by a sensor. The supply device includes a one-way clutch for allowing the upper thread to travel in a predetermined direction which, however, may not be conveyed from the needle side when the supply device is made operative. A CPU controls the amount of thread first supplied by the supply device which will always be smaller than an amount actually required for producing a stitch, resulting in an additional amount to be supplied supplemental in cooperation with the tensioning device.

REFERENCES:
patent: 4566396 (1986-01-01), Sakuma et al.
patent: 4702185 (1987-10-01), Hanyu et al.
patent: 4791876 (1988-12-01), Sasaki et al.
patent: 4932346 (1990-06-01), Matsubara et al.

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