Thread break indicating device for sewing machines using a photo

Details Thread break indicating device for sewing machines using a photo Thread break indicating device for sewing machines using a photo

1988-05-23

1989-06-27

Falik, Andrew M.

Sewing

Elements

Starting or stopping

112278, D05B 6936

Patent

active

048418900

ABSTRACT:
A sewing machine thread break detector using a photo amplifier in which thread to be monitored is guided relatively to a light beam so that thread movement will vary transmitted light. An electronic circuit signals thread breakage when uniformity of the transmitted light beam indicates thread motion has ceased during sewing machine operation.

REFERENCES:
patent: 3174046 (1965-03-01), Lindermann et al.
patent: 3599586 (1971-08-01), Newman
patent: 4250825 (1981-02-01), Kamiyama
patent: 4342580 (1982-08-01), Roberson
patent: 4426948 (1984-01-01), Olasz et al.
patent: 4602582 (1986-07-01), Rawson
patent: 4691647 (1987-09-01), von Stein

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