Inner bobbin case holder of a fully rotating hook

Details Inner bobbin case holder of a fully rotating hook Inner bobbin case holder of a fully rotating hook

1993-10-05

1995-05-09

Crowder, Clifford D.

Sewing

Elements

Revolving hooks

D05B 5726

Patent

active

054130581

ABSTRACT:
A bobbin case holder body and a track projection portion are made of steel. A coating member of a liquid crystal polymer is integrally molded to the outer surface of the track projection portion so as to have a thickness t which is selected to be 0.3 to 0.5 mm. A part of the coating member is fitted into a groove formed in the track projection portion, thereby preventing the member from peeling off. In a loop spreading portion, the track projection portion made of steel is exposed from the coating member so that a so-called thread handing area is prevented from being formed. Therefore, wear resistance and durability are improved.

REFERENCES:
patent: 4393798 (1983-07-01), Cheng
patent: 4638750 (1987-01-01), Mikuni
patent: 4700643 (1987-10-01), Hirose et al.
patent: 4858543 (1989-08-01), Badillo
patent: 5188046 (1993-02-01), Badillo

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