Sewing machine presser foot mechanism

Details Sewing machine presser foot mechanism Sewing machine presser foot mechanism

1986-06-02

1987-10-13

Schroeder, Werner H.

Sewing

Elements

Presser devices

D05B 2900

Patent

active

046990720

ABSTRACT:
A presser foot control for a sewing machine comprises a solenoid and two springs having different spring constants arranged in series with a transmitting lever and a starting lever. A first weaker spring is set in a "previously-pulled" condition and is connected in series with a second, stronger spring. The solenoid force first pulls on the stronger, unloaded spring. Thereafter, the weaker spring, which has been pulled previously into a loaded condition, is pulled and presses the presser foot causing the workpiece to be pressed against the table. Despite variations of thickness in a workpiece, the invention is effective to clamp the workpiece with a substantially constant pressure value.

REFERENCES:
patent: 3952675 (1976-04-01), Thompson
patent: 4058071 (1977-11-01), Dunn et al.
patent: 4381722 (1983-05-01), Takeuchi et al.
patent: 4452158 (1984-06-01), De Palma et al.

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