发明授权
US4825789A Low bobbin thread detector 失效
低底线检测器

Low bobbin thread detector
摘要:
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.
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