Presser foot lifting mechanism

Details Presser foot lifting mechanism Presser foot lifting mechanism

1986-02-26

1987-06-23

Schroeder, Werner H.

Sewing

Elements

Presser devices

D05B 2902

Patent

active

046744240

ABSTRACT:
In a sewing machine, a presser foot lifting mechanism provides two springs, a first spring the compression of which can be changed by a solenoid actuated coil linkage and a second spring the compression of which can be changed by an operator's knee-action for lowering a presser foot. An operation lever rotated by an operator's knee-action controls the timing of solenoid action. A positional difference or gap is provided for the operation lever between a "solenoid on" position and a "first spring off" position, so that an operator can rotate the operation lever without feeling the resisting force of the first spring.

REFERENCES:
patent: 3347194 (1967-10-01), Hale et al.
patent: 4388886 (1983-06-01), Adams
patent: 4409914 (1983-10-01), Sansone

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