Presser foot lift operable independently by manual or power devi

Details Presser foot lift operable independently by manual or power devi Presser foot lift operable independently by manual or power devi

1979-07-13

1981-01-27

Schroeder, Werner H.

Sewing

Elements

Presser devices

D05B 2902

Patent

active

042468566

ABSTRACT:
A sewing machine is described having a presser foot lifting arrangement actuated by a presser lifting rock shaft in the sewing machine arm and both a power operated presser lifting device such as a pneumatic cylinder, electric solenoid, or other actuator as well as an operator controlled presser lifter actuator such as a knee shift or the like wherein there is provided linkage means connecting the presser lifting rock shaft in the sewing machine arm with both the operator influenced and power driven actuator. The linkage means is formed with a pair of parallel lost motion slots each embracing a crank pin associated with a respective one of the actuators so that both actuators are connected for independent operation without influence on each other.

REFERENCES:
patent: 1147139 (1915-07-01), Briggs
patent: 1383438 (1921-07-01), Stein
patent: 1679357 (1928-08-01), Hansen
patent: 1761899 (1930-06-01), Wenzel
patent: 2009194 (1935-07-01), Hleb
patent: 3347194 (1967-10-01), Hale et al.
patent: 3353511 (1967-11-01), Marino

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