Bobbin thread case opener

Sewing – Stitch forming – Revolving-hook type

Patent

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Details

112231, D05B 5722

Patent

active

041424751

ABSTRACT:
A lock stitch sewing machine having a rotary loop taker adapted to carry a loop of thread about a stationary bobbin thread case. The bobbin thread case is restrained from rotation by a finger which is disposed between abutments in the bobbin thread case for opening a passage to allow the needle thread loop past the bobbin thread case rotation restraining means, the rotation restraining finger is vibrated at a frequency greater than four cycles per rotation of the loop taker.

REFERENCES:
patent: 2138939 (1938-12-01), Pudelko
patent: 2990794 (1961-07-01), Ketterer

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