Sewing machine with bobbin thread tension adjusting device

Details Sewing machine with bobbin thread tension adjusting device Sewing machine with bobbin thread tension adjusting device

1981-04-20

1984-07-10

Reynolds, Wm. Carter

Sewing

Stitch forming

Revolving-hook type

112229, 112255, D05B 6300, D05B 112

Patent

active

044586132

ABSTRACT:
A sewing machine having a drive shaft rotated by a machine motor to vertically reciprocate a needle carrying an upper thread is provided with a device for adjusting the tension of a lower thread pulled out from a bobbin located in a bobbin carrier of the sewing machine. The device includes a tension lever cooperated with a spring element, and a releasing lever which is in engagement with a cam rotated by the drive shaft. The position of the tension lever relative to the lower thread is effected by a manually operated dial and a cam engageable with the spring element. The releasing lever is adapted to intermittently release the tension lever from the lower thread during the stitching operation.

REFERENCES:
patent: 328688 (1885-10-01), Keeler
patent: 875603 (1907-12-01), Parkes
patent: 875613 (1907-12-01), Parkes
patent: 1007837 (1911-11-01), Almond
patent: 2975738 (1961-03-01), Hoppe
patent: 3050021 (1962-08-01), Fukushima
patent: 3366082 (1968-01-01), Ross
patent: 3856233 (1974-12-01), Thomas
patent: 3996866 (1976-12-01), Bianchi
patent: 4182250 (1980-01-01), Johnson

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