Upper knife releasing device in an overlock sewing machine

Details Upper knife releasing device in an overlock sewing machine Upper knife releasing device in an overlock sewing machine

1994-05-20

1995-06-27

Crowder, Clifford D.

Sewing

Work manipulating

Trimmers

D05B 3706

Patent

active

054270413

ABSTRACT:
In an overlock sewing machine for an overedge stitch and at least one kind of chain stitch other than the overedge stitch, an upper knife releasing device according to the invention comprises: an upper knife rocking arm 26 to which an cloth cutting upper knife 30 is secured; an upper knife rocking shaft 28 which is fixedly secured to the upper knife rocking arm and is rotatably supported relative to a frame; a controller shaft 50; and a controller 52 having a guide groove 52a, the controller being rotatable about the controller shaft, a link mechanism (38 and 34) having one end which is linearly reciprocated along the guide groove, and the other end which is fixedly secured to the upper knife rocking shaft. In the device, a controller rotating mechanism controls the rotational angle of the controller so that the upper knife rocking shaft is allowed to turn in the case of a chain stitch in which the knife is used, and the upper knife rocking shaft is not allowed to turn in the case of a chain stitch in which the knife is not used, and also a controller shaft moving mechanism moves the controller shaft so that the upper knife rocking arm is moved downwardly in the case of a chain stitch in which the knife is used, and the upper knife rocking arm is retracted upwardly in the case of a chain stitch in which the knife is not used.

REFERENCES:
patent: 4167042 (1965-01-01), Bono
patent: 4248166 (1981-02-01), Kamiya
patent: 4384540 (1983-05-01), Vollmar et al.
patent: 4773342 (1988-09-01), Fietta
patent: 5289789 (1994-03-01), Sakuma

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