Low bobbin thread detector

Sewing – Elements – Thread sensing

Patent

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Details

112273, D05B 4500

Patent

active

048257893

ABSTRACT:
An optical low bobbin thread detector is disclosed utilizing particularly cost effective matrixed light emitting diodes for bobbin thread detection and alarm, and virtually eliminating false alarms by employing a system requiring detection of a predetermined number of successive valid low bobbin thread detections to justify actuation of the alarm.

REFERENCES:
patent: 4212257 (1980-07-01), Herron et al.
patent: 4413581 (1983-11-01), Logan
patent: 4693196 (1987-09-01), Hager

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