Sewing machine having a device actuable by a pressure medium for

Details Sewing machine having a device actuable by a pressure medium for Sewing machine having a device actuable by a pressure medium for

1989-06-05

1991-01-01

Schroeder, Werner H.

Sewing

Elements

Presser devices

D05B 2902

Patent

active

049810944

ABSTRACT:
A device in a sewing machine for applying a variable downward force to a presser bar. A guide lever engages the presser bar and in turn is urged downward by the force of a spring. The bottom of the spring is held fixed to a lock sleeve on the guide lever. The top of the spring is fixed to a sleeve on a shaft which is disposed vertically inside the spring. The shaft passes freely out the bottom of the spring and through the guide lever without engaging either of these. The shaft and thereby the top of the spring are urged downward by a controllable pneumatic device in order to set the compression of the spring and thereby the downward force applied to the pressure bar by the guide lever. The pneumatic device preferably includes a pair of separately controlled pneumatic pistions arranged in series for moving the shaft to at least two predetermined positions.

REFERENCES:
patent: 2541888 (1951-02-01), Pinkvoss
patent: 2750090 (1956-06-01), Odermann et al.
patent: 3601072 (1971-08-01), Husted
patent: 4214540 (1980-07-01), Cook
patent: 4381722 (1983-05-01), Takeuchi et al.

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