Upper thread tension adjusting assembly with automatic release d

Details Upper thread tension adjusting assembly with automatic release d Upper thread tension adjusting assembly with automatic release d

1975-04-09

1976-12-14

Schroeder, Werner H.

Sewing

Elements

Tensioning

D05B 4704

Patent

active

039968669

ABSTRACT:
A device for automatic tension release in an upper thread tension adjusting assembly which includes a drive shaft, actuating the detachment of the tension disks of said adjusting device, characterized in that said drive member is built in the thread tension adjusting device and is made by an electromagnet placed in a circular crown arranged between the tension disks and the adjusting knob.

REFERENCES:
patent: 2698590 (1955-01-01), Garbe
patent: 3150846 (1964-09-01), Laidig
patent: 3410071 (1968-11-01), Heimes
patent: 3601074 (1971-08-01), Von Hagen
patent: 3797426 (1974-03-01), Von Hagen
patent: 3927631 (1975-12-01), Kuhar

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