Zigzag sewing machine with fabric-edge tracing function

Details Zigzag sewing machine with fabric-edge tracing function Zigzag sewing machine with fabric-edge tracing function

1986-05-05

1987-05-12

Nerbun, Peter

Sewing

Stitch forming

Zigzag

112153, 112306, D05B 302

Patent

active

046640487

ABSTRACT:
A zig zag sewing machine having a feed device for feeding a workpiece in a feed direction on a work bed, an endwise reciprocable needle bar for carrying a needle, and a support member joggable laterally with respect to the feed direction and supporting the needle bar, including a detector having a light emitting portion and a light receiving portion and disposed on the support member for detecting the edge of the workpiece extending in the feed direction. The detector is movable laterally with respect to the feed direction in a predetermined positional relation with the support member at least when the support member is laterally moved. The lateral positions of the support member and the detector are changed by a driving device which is controlled so that an amount of light received by the light receiving portion coincides with a predetermined amount, whereby successive stitches to be formed by the needle are placed on a line which is away from the workpiece edge by a predetermined constant distance.

REFERENCES:
patent: 3650229 (1972-03-01), Rovin
patent: 4423690 (1984-01-01), Willenbacher

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