Thread tensioning device for a sewing machine

Details Thread tensioning device for a sewing machine Thread tensioning device for a sewing machine

1984-08-02

1985-10-08

Schroeder, Werner H.

Sewing

Elements

Tensioning

D05B 4702

Patent

active

045453110

ABSTRACT:
A thread tensioning device, wherein a helical spring of varying diameter is deflected by a control knob with a defined operating range to increase tension in sewing thread moved through the device, is provided with a member which is formed to engage one or more intermediate coils of the spring while the spring is deflected more than a predetermined amount by the control knob and thereby increase thread tension obtainable over a portion of the operating range of the knob.

REFERENCES:
patent: 1820119 (1931-08-01), Chason
patent: 2937605 (1960-05-01), Dunn et al.
patent: 2955775 (1960-10-01), Johnson
patent: 2965058 (1960-12-01), Herbst et al.
patent: 2986358 (1961-05-01), Johnson
patent: 3150846 (1964-09-01), Laidig
patent: 3667414 (1972-06-01), Illes et al.

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