Edge tracing sewing machine capable of automatically adjusting n

Details Edge tracing sewing machine capable of automatically adjusting n Edge tracing sewing machine capable of automatically adjusting n

1988-04-25

1989-05-09

Nerbun, Peter

Sewing

Stitch forming

Zigzag

112153, 112306, D05B 302

Patent

active

048278580

ABSTRACT:
A sewing machine having an edge sensor for detecting an edge of a workpiece in a lateral direction perpendicular to the workpiece feed direction, and a tracing control device for controlling a relative position between a needle and the workpiece in the lateral direction to form stitches along a line a predetermined distance away from the workpiece edge. A motor to change a relative position between the workpiece edge and the sensor is operated from a first limit position to a second limit position to obtain first output signals of the sensor, and an average of a maximum and a minimum value of the first output signals is calculated. The motor is then operated from the second limit position toward the first limit position to obtain second output signals of the sensor. A first and a second average position signal are determined such that the average position signals correspond to the average value of the maximum and minimum values of the first output signals. The tracing control device is operated to adjust the relative position between the needle and the workpiece, depending upon a compensation value which is equal to a half of a difference between the values of the first and second average position signals.

REFERENCES:
patent: 4664048 (1987-05-01), Naganuma et al.
patent: 4757773 (1988-07-01), Nomura et al.

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