Rotary looptaker

Details Rotary looptaker Rotary looptaker

1989-05-24

1990-11-20

Schroeder, Werner H.

Sewing

Elements

Revolving hooks

112181, 112184, 112231, D05B 5700, D05B 5714, D05B 5716

Patent

active

049709755

ABSTRACT:
A rotary looptaker includes a looptaker body rotatable about a vertical axis and a bobbin case restrained from rotary motion with the looptaker body. A plurality of annular protrusions are provided on a flange of the bobbin case so as to extend in a circumferential direction of the bobbin case and are in engagement with a flat surface formed on a raceway of the looptaker body. When the looptaker body is rotated, the bobbin case slides relative to the looptaker body through a very small contact area between the annular protrusions and the flat surface, thus reducing sliding friction between the looptaker body and the bobbin case. Accordingly, noise and vibration are decreased when a rotation restraining projection of the bobbin case contacts a restraint element secured to a machine frame.

REFERENCES:
patent: 2108412 (1938-02-01), Sauer
patent: 3343510 (1967-09-01), Attwood
patent: 3347193 (1967-10-01), Perri
patent: 3382826 (1968-05-01), Johnson
patent: 3390653 (1968-07-01), Ketterer
patent: 4074643 (1978-02-01), Ketterer
patent: 4355590 (1982-10-01), Ketterer
patent: 4676178 (1987-07-01), Hirose
patent: 4700643 (1987-10-01), Hirose

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