Sewing machine with edge trimmer

Details Sewing machine with edge trimmer Sewing machine with edge trimmer

1985-01-14

1986-08-05

Schroeder, Werner H.

Sewing

Work manipulating

Trimmers

112 34, 112199, D05B 6502

Patent

active

046036474

ABSTRACT:
A chainstitch machine has an edge trimmer knife driven in vertical chopping motion adjacent the needle by a linkage actuated by an oscillating shaft that operates synchronously relative to stitch-forming components. The linkage includes a bracket oscillated by the shaft and a joint movable along the bracket between a first position, in which the axis of the joint is offset from the axis of the shaft to communicate oscillating movement to the knife, and a second position, in which the axis of the joint is concentric with the shaft and transmits no oscillatory movement. In the second position, the knife is retracted by the linkage to a location above the region through which work pieces move, but in the first position, the linkage moves the knife down so that part of the knife extends through the plane of the throat plate and is pressed against an edge of a throat plate insert by a small pressure slide entirely within a notch in the insert and guided by juxtaposed edges of the notch. The chain of stitches between each pair of work pieces is cut by a rotary knife blade cooperating with a fixed blade between front and back sections of the feed dog to be close to the stitch-forming location.

REFERENCES:
patent: 2229991 (1941-01-01), Sauer
patent: 3818851 (1974-06-01), Marforio
patent: 3871308 (1975-03-01), Galya et al.
patent: 3881434 (1975-05-01), Kelly
patent: 4098209 (1978-07-01), Schopf
patent: 4502400 (1985-03-01), Walther

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