Lower thread tension adjusting device of sewing machine

Details Lower thread tension adjusting device of sewing machine Lower thread tension adjusting device of sewing machine

1983-12-23

1985-09-24

Reynolds, Wm. Carter

Sewing

Elements

Revolving hooks

112231, D05B 6300, D05B 5726

Patent

active

045427062

ABSTRACT:
A lower thread tension adjusting device is disclosed, which is used in combination with a sewing machine having a horizontal rotary loop taker and a stationary bobbin carrier accomodating a bobbin. A lower thread drawn from the bobbin is passed between a base plate secured to the outer face of the bobbin carrier and the free end of a resilient plate having one end secured to the base plate, so that by manipulation of an adjusting screw a variable degree of tension can be applied to the lower thread. The device is so designed that when an index provided on the adjusting screw is in alignment with a reference mark of the base plate, the lower thread will be given a predetermined standard value of tension.

REFERENCES:
patent: 1188818 (1916-06-01), Parkes
patent: 2488052 (1949-11-01), Robert
patent: 2742008 (1956-04-01), Enos
patent: 2836136 (1958-05-01), Ayres
patent: 4397250 (1983-08-01), Zylbert et al.

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