Bobbin case holder with adjustable thread tensioning device

Details Bobbin case holder with adjustable thread tensioning device Bobbin case holder with adjustable thread tensioning device

1988-11-07

1989-12-05

Falik, Andrew M.

Sewing

Elements

Revolving hooks

D05B 6300

Patent

active

048845191

ABSTRACT:
A bobbin case wherein a cylindrical wall which surrounds the thread bobbin supports an externally mounted spring having a pan-shaped portion for a disc-shaped thread tensioning member provided with a flat thread-contacting surface which confronts a complementary portion of the external surface of the cylindrical wall. The bias of the spring upon the tensioning member, and hence the force with which the surface of the tensioning member urges the thread against the adjacent portion of the external surface of the cylindrical wall, is adjustable by a screw. The tensioning member is tiltably installed in the pan-shaped portion of the spring so as to adjust its inclination relative to the adjacent portion of the external surface of the cylindrical wall in dependency on the position of the thread.

REFERENCES:
patent: 3381642 (1968-05-01), Bono
patent: 3437284 (1969-04-01), Philips
patent: 3568616 (1971-03-01), Coulombe
patent: 4235178 (1980-11-01), Ackermann

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