Bobbin thread tension device

Details Bobbin thread tension device Bobbin thread tension device

1979-03-26

1980-11-25

Schroeder, Werner H.

Sewing

Elements

Revolving hooks

D05B 5726, B65H 5906

Patent

active

042351782

ABSTRACT:
A bobbin thread tension for a closed end cylindrical body bobbin thread case of a horizontal axis type rotary hook for a lockstitch sewing machine consisting of a diagonally slotted thread aperture in the wall of the bobbin case partially covered by a bobbin thread control that is adjustably mounted on the wall of the bobbin case by a pivot screw at one of its ends and inward a clamp screw passing through an enlarged hole in the bobbin thread control allowing the control to be pivoted to cover an effective amount of the thread aperture thereby increasing or decreasing the bobbin thread tension.

REFERENCES:
patent: 2583538 (1952-01-01), Bracklin
patent: 2836136 (1958-05-01), Ayres
patent: 3381642 (1968-05-01), Bono
patent: 3437284 (1969-04-01), Philips

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