Sewing machine with fabric-edge tracing function

Details Sewing machine with fabric-edge tracing function Sewing machine with fabric-edge tracing function

1987-11-24

1989-04-25

Nerbun, Peter

Sewing

Stitch forming

Zigzag

112153, 112306, D05B 302

Patent

active

048237167

ABSTRACT:
A sewing machine capable of forming a line of stitches along the edge of a workpiece, while the needle is reciprocated by a needle bar relative to the workpiece in a feeding movement. The needle bar is supported by an oscillator which is joggable in a lateral direction substantially perpendicular to the feeding direction. A sensor is provided to detect the fabric edge, by emitting a radiation toward a reflecting surface provided on the work bed of the machine. The sensor determines the position of the fabric edge by detecting an amount of the reflected radiation received. The reflecting surface has a concave shape in cross section taken in a vertical plane parallel to the feeding direction. The lateral jogging movement of the oscillator is controlled according to the amount of the reflected radiation received by the sensor, so that the line of stitches is spaced apart from the edge of the workpiece by a predetermined distance.

REFERENCES:
patent: 4226197 (1980-10-01), Pollmeier et al.
patent: 4642469 (1987-02-01), Bretaudeau et al.
patent: 4664048 (1987-05-01), Naganuma et al.

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