Device for detecting absence of a thread in a sewing machine

Details Device for detecting absence of a thread in a sewing machine Device for detecting absence of a thread in a sewing machine

1980-07-29

1984-02-07

Nerbun, Peter P.

Sewing

Elements

Starting or stopping

D05B 6936

Patent

active

044296517

ABSTRACT:
Disclosed is a device for detecting absence of a needle thread or a bobbin thread in a sewing machine. The device includes at least one piezoelectric element provided between a throat plate and a rotary hook of the sewing machine. The piezoelectric element is adapted for intermittent contact with one of the threads when the thread shifts from the center of the needle hole by engaging with the rotary hook fin, and for signalling its contact with the thread.

REFERENCES:
patent: 3101687 (1963-08-01), Zeltwanger
patent: 3732834 (1973-05-01), Mayer
patent: 3922981 (1975-12-01), Hughes
patent: 4078505 (1978-03-01), Fitton et al.

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