Sewing – With tables or stands – For plural sewing units
Patent
1975-09-18
1976-11-16
Hunter, H. Hampton
Sewing
With tables or stands
For plural sewing units
B65H 6302
Patent
active
039916928
ABSTRACT:
A bobbin thread depletion signal for lock stitch sewing machines or the like. The bobbin, which is constructed so that one of the end flanges is free to slide axially along the hub, is horizontally mounted in the machine bobbin carrier. When thread is wound on the bobbin, the slideable flange is forced outward against a stop and is positioned in the field of an electronic sensor, such as an oscillator coil, the inductance of which is altered by a proximity of the slideable flange.
When the thread is removed from the hub, the slideable end flange will drop from the environment of the sensor toward the stationary flange thereby producing an inductance change that is detected by electronic sensor circuitry that signals the sewing machine operator.
REFERENCES:
patent: 2420275 (1947-05-01), Winberg
patent: 2647482 (1953-08-01), Campbell
patent: 3129680 (1964-04-01), Doerner
patent: 3601073 (1971-08-01), Simpson
Papajewski Reinhold
Walter Heinz Emil
Bell Edward L.
Falk Julian
Hunter H. Hampton
Smith Robert E.
The Singer Company
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