Sewing – Elements – Thread sensing
Patent
1978-06-19
1979-12-18
Nerbun, Peter P.
Sewing
Elements
Thread sensing
242 36, B65H 6308, D05B 5100
Patent
active
041788664
ABSTRACT:
A lock stitch sewing machine having a bobbin thread run-out indicator which is adjustable to permit initiation of the indication with a selected length of bobbin thread remaining on the bobbin. A bobbin case is supported in a rotating loop taker against rotation therewith and partially extending therefrom. The bobbin is fashioned with two flanges joined by a hub and is carried in a cavity in the bobbin case, the cavity being arranged so that one flange of the bobbin also extends partially from the rotating loop taker. A fibre optic is arranged in the sewing machine frame to extend a light ray through an opening in the bobbin case above the rotating loop taker but in between the flanges of the bobbin, adjacent the hub thereof, and through an opening in the opposite side of the bobbin case to a light sensor. The light sensor is carried so as to be shiftable normal to the direction of the light ray. Lateral shift of the light sensor causes the light sensor to receive rays from the fibre optic which are spaced at variable distances from the hub of the bobbin, thereby providing for low thread indication with selected length of bobbin thread remaining on the bobbin hub.
REFERENCES:
patent: 1988255 (1935-01-01), Soons
patent: 3082968 (1963-03-01), Reichelt et al.
patent: 3599586 (1971-08-01), Newman
Bell Edward L.
Nerbun Peter P.
Schmidt Edward P.
Smith Robert E.
The Singer Company
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