Hook assembly with coated surfaces for sewing machine

Details Hook assembly with coated surfaces for sewing machine Hook assembly with coated surfaces for sewing machine

1995-02-17

1997-07-29

Izaguirre, Ismael

Sewing

Elements

Revolving hooks

112256, D05B 5716

Patent

active

056513232

ABSTRACT:
A hook assembly includes a bearing rib on a bobbin case basket or at least a surface layer thereof composed of a synthetic resin, such as a liquid crystal polymer, which has properties such that the amount of the rotating friction generated between such surface layer and an inner surface layer of a groove shaped bearing raceway in which the bearing rib is fitted is lower, with no industrial sewing machine oil therebetween than such industrial sewing machine oil where to be provided therebetween. The hook assembly thus has good durability without any lubrication being provided. Accordingly, oil staining of threads and sewing materials by a lubricant is avoided, and sewing quality is enhanced.

REFERENCES:
patent: 2348718 (1944-05-01), Bethune
patent: 2822773 (1958-02-01), Ivanko
patent: 2851978 (1958-09-01), Eriksson
patent: 3016033 (1962-01-01), Herbst
patent: 3347193 (1967-10-01), Perri
patent: 4393798 (1983-07-01), Cheng
patent: 4660487 (1987-04-01), Mikuni
patent: 5076182 (1991-12-01), Hirose et al.
patent: 5109783 (1992-05-01), Shimizu
patent: 5312866 (1994-05-01), Tsutsumi et al.
patent: 5413058 (1995-05-01), Hirose et al.

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