Variable presser bar pressure control arrangement

Details Variable presser bar pressure control arrangement Variable presser bar pressure control arrangement

1979-05-30

1980-07-29

Feldbaum, Ronald

Sewing

Elements

Presser devices

D05B 2900

Patent

active

042145406

ABSTRACT:
A sewing machine having a presser bar operated by a lever having a movable fulcrum to vary the mechanical advantage of the lever and thereby vary the effective pressure on the presser bar.

REFERENCES:
patent: 1202224 (1916-10-01), Ringe
patent: 2280193 (1942-04-01), Le Vesconte
patent: 2827006 (1958-03-01), Rockerath
patent: 3366083 (1968-01-01), Ketterer et al.
patent: 3815529 (1974-06-01), Adams
patent: 3984745 (1976-10-01), Minalga
patent: 4016441 (1977-04-01), Herr et al.
patent: 4056071 (1977-11-01), Adams
patent: 4067275 (1978-01-01), Willenbacher

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