Thread detecting apparatus in a sewing machine

Details Thread detecting apparatus in a sewing machine Thread detecting apparatus in a sewing machine

1989-03-09

1990-07-03

Nerbun, Peter

Sewing

Elements

Starting or stopping

112278, D05B 6936

Patent

active

049381598

ABSTRACT:
A detecting electrode is mounted on the path of a thread in a sewing machine. When a cloth is sewn in the sewing machine, a bobbin thread or a needle thread moves spatially against the detecting electrode. An electric signal is obtained on the detecting electrode in response to such movement of the thread. On the other hand, a timing signal generator generates a timing signal synchronous with the vertical movement of the needle in the sewing machine. A discriminator receives the electrical signal from the detecting electrode and the timing signal from the timing signal generator. The discriminator compares the electric signal with a reference signal when it receives the timing signal and outputs a discrimination signal in accordance with the result of the comparison.

REFERENCES:
patent: 4256247 (1981-03-01), Loepfe
patent: 4426948 (1984-01-01), Olasz et al.
patent: 4429651 (1984-02-01), Tajima
patent: 4628847 (1986-12-01), Rydborn
patent: 4763588 (1988-08-01), Rydborn

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