Upper and lower thread tension devices for sewing machine

Details Upper and lower thread tension devices for sewing machine Upper and lower thread tension devices for sewing machine

1986-05-20

1987-11-10

Schroeder, Werner H.

Sewing

Elements

Presser devices

112229, 112254, D05B 6300, D05B 4702

Patent

active

047049758

ABSTRACT:
A lower thread tension device is provided in association with adjustment of an upper thread tension device in such a manner that when the tension of the upper thread tension device is strong within an adjusting range, the lower thread tension is adjusted strongly, and when the tension of the upper thread tension device is weak within the adjusting range, the lower thread tension is adjusted weakly. The upper and lower thread tension device includes a dial for adjusting an upper thread tension, a potentiometer connected to the dial, and an electromagnet with an actuator acting on the lower thread to adjust its tension in response to a signal received from the potentiometer due to rotation of the dial. The upper and lower thread tension device includes a dial for adjusting an upper thread tension, a potentiometer connected to the dial, and an electromagnet with an actuator acting on the lower thread to adjust its tension in response to a signal received from the potentiometer due to rotation of the dial.

REFERENCES:
patent: 3996866 (1976-12-01), Bianchi
patent: 4289087 (1981-09-01), Takenoya et al.
patent: 4429649 (1984-02-01), Eguchi et al.
patent: 4458613 (1984-07-01), Eguchi et al.
patent: 4638751 (1987-01-01), Hanyee et al.

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