Detectable bobbin and core

Details Detectable bobbin and core Detectable bobbin and core

1997-02-18

1999-03-02

Mansen, Michael

Winding, tensioning, or guiding

Bobbin or spool

Cop-tube type

242173, B65H 7510, B65H 5500

Patent

active

058759832

ABSTRACT:
A magnetically detectable bobbin for a sewing machine. The apparatus includes a substantially non-metallic detectable bobbin core. The core includes a substantially non-metallic cylindrical body having a detectable dopant in the cylindrical body. In the preferred embodiment, the dopant is magnetite. The thread supply is wound about the bobbin core after a frictional outer surface is applied to the bobbin core to aid in windability of the thread supply.

REFERENCES:
patent: 1516002 (1924-11-01), Curry
patent: 1570534 (1926-01-01), Sweeney et al.
patent: 2200720 (1940-05-01), Morin et al.
patent: 2906473 (1959-09-01), Crawley
patent: 3061888 (1962-11-01), Wadham
patent: 3716202 (1973-02-01), Thomas
patent: 4100866 (1978-07-01), Philips
patent: 4244313 (1981-01-01), Rovin et al.
patent: 4390144 (1983-06-01), Mueller

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