Sewing – Elements – Thread sensing
Patent
1979-05-18
1980-02-19
Nerbun, Peter P.
Sewing
Elements
Thread sensing
250571, B65H 6302, D05B 6900
Patent
active
041889029
ABSTRACT:
A bobbin thread run-out detector having a light source and means for directing a beam of light toward a set of retro-reflecting reflectors on the bobbin and toward a reference reflecting spot on the loop taker. Bobbin thread wound around the bobbin is interposed between the light source and the retro-reflecting reflectors. When a sufficient quantity of thread has been consumed to expose the indentations to the source of light, the light is reflected to a photodetector. Light from the source is also intermittently reflected onto the photodetector by the reflecting spot on the loop taker during each revolution of the loop taker. An electronic circuit compares the light received by the photodetector from the bobbin with the light received from the reflecting spot on the loop taker. When the quantity of light reflected from the bobbin changes relative to the quantity of light reflected from the loop taker a low bobbin thread alarm is activated to warn the operator of the impending exhaustion of bobbin thread.
REFERENCES:
patent: 2350397 (1944-06-01), Haas
patent: 3082968 (1963-03-01), Reichelt et al.
patent: 3599586 (1971-08-01), Newman
patent: 3631901 (1972-01-01), Langenbach et al.
patent: 3670976 (1972-06-01), Vischiani
patent: 3777168 (1973-12-01), Sansone
patent: 3845320 (1974-10-01), Winberg
Bell Edward L.
Nerbun Peter P.
Smith Robert E.
The Singer Company
Wallach Michael H.
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