Sewing – Elements – Thread sensing
Patent
1981-07-15
1982-06-08
Nerbun, Peter P.
Sewing
Elements
Thread sensing
D05B 4500, D05B 5900
Patent
active
043334113
ABSTRACT:
A bobbin thread level detection and display arrangement for a sewing machine includes an array of light emitting diodes which are activated to convey to the sewing machine operator an indication of the quantity of thread left of the bobbin. To control the light emitting diodes, an arrangement utilizing a light source and a phototransistor is arranged proximate the bobbin. The circuitry for controlling the activation of the light emitting diodes also provides for a "fading in" of the individual light emitting diodes to provide a display in the nature of a bar graph.
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Bell Edward L.
Davis David L.
Nerbun Peter P.
Smith Robert E.
The Singer Company
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