Adjustable anti-spill bobbin tension spring

Details Adjustable anti-spill bobbin tension spring Adjustable anti-spill bobbin tension spring

1979-08-06

1980-08-19

Schroeder, Werner H.

Sewing

Elements

Revolving hooks

242156, D05B 5726

Patent

active

042178398

ABSTRACT:
An annular disc is forced onto the central sleeve of the sewing machine bobbin case and held in place by the tight interference fit. A set screw within the limited area of the front wall, thick enough to hold the entire length of the screw, can be adjusted from outside the bobbin case to set the braking pressure of the disc against a bobbin flange to prevent excessive rotation of the bobbin and spillage of its thread.

REFERENCES:
patent: 84065 (1868-11-01), Locke
patent: 512023 (1894-01-01), Hauck
patent: 2555658 (1951-06-01), Ritter
patent: 3702102 (1972-11-01), Davidson et al.
patent: 3767136 (1973-10-01), Krausse et al.
patent: 4074645 (1978-02-01), Droste et al.
patent: 4157691 (1979-06-01), Cerliani

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