Sewing – Elements – Revolving hooks
Patent
1988-11-28
1990-05-01
Falik, Andrew M.
Sewing
Elements
Revolving hooks
112184, 112255, 112458, D05B 302, D05B 1900, D05B 5726
Patent
active
049209035
ABSTRACT:
A lower thread tension adjusting device for a sewing machine comprising first and second tension arrangements mounted on a bobbin carrier of the sewing machine for tensioning a lower thread with a predetermined tension and a predetermined additional tension, respectively. A positioning device is mounted on the bobbin carrier and movable between first and second set positions in which the positioning devices moves the second tension arrangement to operative and inoperative positions wherein the second arrangement provides and does not provide the predetermined additional tension of the lower thread. A guide assembly guides the lower thread to positions adjacent to one end and a center of a laterally elongated needle hole and simultaneously guides the positioning device to the first and second positions thereof. A control unit moves the guide assembly between first and second guide positions thereof in accordance with selected patterns of straight and zigzag stitches, respectively.
REFERENCES:
patent: 4429649 (1984-02-01), Eguchi et al.
patent: 4458613 (1984-07-01), Eguchi et al.
patent: 4542706 (1985-09-01), Hanyu et al.
patent: 4693193 (1987-09-01), Hanyu et al.
patent: 4700644 (1987-10-01), Eguchi et al.
Hara Kazumasa
Koike Mikio
Nishijima Mitsuru
Okutani Koji
Falik Andrew M.
Janome Sewing Machine Co. Ltd.
Striker Michael J.
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