Sewing – Elements – Thread sensing
Patent
1979-01-15
1979-12-25
Nerbun, Peter P.
Sewing
Elements
Thread sensing
D05B 4500
Patent
active
041800079
ABSTRACT:
A low bobbin thread supply alarm in which a bobbin case is fitted with lever pivoted thereon and carrying a permanent magnet for travel to the hub of the bobbin. An arm overhanging the bobbin case and bobbin carries a Hall generator in a portion thereof overlying the hub of the bobbin. The lever and permanent magnet carried thereby is urged by an electromagnet supported externally of the looptaker toward and away from the hub of the bobbin at suitable intervals. When the lever pivots greater than a given amount due to depletion of thread on the hub of the bobbin the permanent magnet on the lever will trigger a voltage change on the Hall generator which may cause an appropriate alarm to provide a warning of a low thread condition.
REFERENCES:
patent: 3129680 (1964-04-01), Doerner
patent: 3601073 (1971-08-01), Simpson
patent: 3991692 (1976-11-01), Papajewski et al.
Jaffe Wolfgang
Peterson Wesley R.
Bell Edward L.
Nerbun Peter P.
Schmidt Edward P.
Smith Robert E.
The Singer Company
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