Device for adjusting lower thread tension of sewing machine

Details Device for adjusting lower thread tension of sewing machine Device for adjusting lower thread tension of sewing machine

1982-03-22

1984-09-18

Nerbun, Peter P.

Sewing

Elements

Tensioning

242150M, D05B 4700

Patent

active

044717059

ABSTRACT:
An electromagnetic driving device is provided at a non-rotating part of a sewing machine, thereby to rotate a first magnet via transmission mechanism. A second magnet which is opposite to the first magnet with an appropriate space thereby, is rotatably provided with respect to a bobbin carrier. These magnets keep a certain one rotating relative position by means of the opposing magnetic poles, thereby to transmit rotation of the first magnet to the second magnet. Rotation of the second magnet actuates a tension adjusting mechanism comprising a thread tension adjusting spring provided on the bobbin carrier, via the transmission mechanism so as to adjust the thread tension, and controls the electromagnetic driving device in response to designation of the thread tension. Thus, the tension of the lower thread may be adjusted when attaching the bobbin carrier in the sewing machine.

REFERENCES:
patent: 3996866 (1976-12-01), Bianchi
patent: 4377980 (1983-03-01), Hanyu et al.

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