Device for guiding the needle thread in central bobbin hook type

Details Device for guiding the needle thread in central bobbin hook type Device for guiding the needle thread in central bobbin hook type

1986-12-05

1988-02-16

Reynolds, Wm. Carter

Sewing

Stitch forming

Shuttle type

112232, D05B 5712

Patent

active

047247827

ABSTRACT:
The takeup limb of each needle thread loop in a central bobbin hook type sewing machine is engaged by a kidney-shaped cam on the shuttle hook driver and by a projection on the housing for the hook while the takeup lever of the machine reduces the size of the loop. This ensures that the takeup limb is held and the loop is guided substantially during the entire interval of reduction of the size of the loop. The cam has a lobe with a groove for the takeup limb, and the projection of the housing engages the loop prior, during and subsequent to withdrawal of the takeup limb from the groove of the lobe.

REFERENCES:
patent: 1047728 (1912-12-01), Baker et al.
patent: 2989017 (1961-06-01), Taketomi
patent: 4095539 (1978-06-01), Johnson
patent: 4643112 (1987-02-01), Sidler

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