Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent
1978-04-25
1979-07-31
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
242 36, G01N 2130
Patent
active
041631587
ABSTRACT:
A mechanism for detecting the depletion of bobbin thread in a sewing machine. A bobbin is formed with a polygonal core having a plurality of light reflecting surfaces contained thereon. A light source transmits a beam of light toward the polygonal core of the bobbin and the light reflected therefrom is intercepted by a photodetector. The polygonal reflecting surfaces contained on the bobbin core do not begin to reflect light until a sufficient quantity of bobbin thread has been consumed in the sewing process to expose a part of the reflective surface portion of the bobbin core. The rotation of the bobbin thereafter results in flashes of light being received by the photodetector. An electronic circuit analyzes the output of the photodetector and distinguishes between the flashes and steady ambient light to signal the impending depletion of bobbin thread.
REFERENCES:
patent: 3599586 (1971-08-01), Newman
patent: 3631901 (1972-01-01), Langenbach et al.
patent: 3693671 (1972-09-01), Desai
patent: 3777168 (1973-12-01), Sansone
patent: 3845320 (1974-10-01), Winberg
Japanese Lay-Open Pub. No. 50-133044, Oct. 21, 1975 Taketomi.
Japanese Lay-Open Pub. No. 50-133047, Oct. 21, 1975 Taketomi.
Brown Jack
Coughenour Donald J.
Herr John A.
Bell Edward L.
Nelms David C.
Smith Robert E.
The Singer Company
Wallach Michael H.
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