Sewing – Stitch forming – Revolving-hook type
Patent
1979-07-16
1980-11-11
Reynolds, Wm. Carter
Sewing
Stitch forming
Revolving-hook type
112231, D05B 5708, D05B 5900
Patent
active
042326184
ABSTRACT:
In a lockstitch sewing machine, a bobbin thread replenishing mechanism for selectively rotating the bobbin to wind replenishment thread thereon from a needle by means of a spindle selectively engaging the bobbin for rotating the bobbin with the machine looptaker wherein a slip clutch provided with an elongated slot is positioned around a flattened end portion of the spindle generally within a central aperture of a bobbin thread control cam. The slip clutch has an enlarged lower flange which rests on the looptaker base and rubs against the thread control cam so that by this arrangement the spindle will be driven with the looptaker by way of friction coupling of the slip clutch between the looptaker and the thread control cam. Should sufficient resistance of the turning of the spindle arise, the looptaker and thread control cam turn freely relative the slip clutch thereby preventing overwinding of the bobbin.
REFERENCES:
patent: 2056829 (1936-10-01), Colegrove et al.
patent: 2394369 (1946-02-01), Colegrove
patent: 3154035 (1964-10-01), Edwards et al.
patent: 3693565 (1972-09-01), Ketterer
patent: 3693566 (1972-09-01), Ketterer
patent: 4091755 (1978-05-01), Ishikawa et al.
Bell E. L.
Lackenbach Elliot A.
Reynolds Wm. Carter
Smith Robert E.
The Singer Company
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