Overlock sewing machine

Details Overlock sewing machine Overlock sewing machine

1996-03-05

1998-01-27

Lewis, Paul C.

Sewing

Elements

Tensioning

112162, 112168, D05B 120, D05B 4702

Patent

active

057112380

ABSTRACT:
An overlock sewing machine which can switch its operation from an ordinary over-edge chain stitch to a rolled seam or vice versa with no requirement for a complicated operation of adjusting thread tension is obtained. This overlock sewing machine is provided with a spring for providing a thread with prescribed tension. The overlock sewing machine is further provided with a switching mechanism for switching the thread tension between that for the rolled seam and that for the over-edge chain stitch by switching the spring between a tensioning state and a non-tensioning state. Thus, the thread tension is readily switched between that for the rolled seam and that for the over-edge chain stitch.

REFERENCES:
patent: 2157373 (1939-05-01), Weis
patent: 4721049 (1988-01-01), Hanyu et al.
patent: 4726308 (1988-02-01), Aida et al.
patent: 4803936 (1989-02-01), Mikuni et al.
patent: 5216970 (1993-06-01), Sakuma
patent: 5237942 (1993-08-01), Satoma
patent: 5529003 (1996-06-01), Kojima et al.

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