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

1988-05-09

1989-09-26

Nerbun, Peter

Sewing

Stitch forming

Zigzag

112153, 112306, D05B 302

Patent

active

048691895

ABSTRACT:
A sewing machine for forming successive stitches along an edge of a workpiece, including an endwise reciprocable sewing needle, a feeding device for feeding the workpiece in a feed direction, in synchronization with reciprocations of the needle, a control motor for changing a relative position between the needle and the workpiece in a lateral direction perpendicular to the feed direction, an edge sensor generating an output signal corresponding to a position relative to the workpiece edge in the lateral direction, and a position control device for receiving the output signal from the sensor in synchronization with the needle reciprocations and applying to the control motor a drive signal to control the relative position between the needle and the workpiece edge. The drive signal is determined based on the output signal of the sensor. A signal delay device is provided to delay the application of the drive signal to the control motor, with respect to the generation of the output signal from the sensor, by a time interval corresponding to a feeding movement of a detected portion of the workpiece to a lowered position of the needle.

REFERENCES:
patent: 4248168 (1981-02-01), Hoffman
patent: 4318357 (1982-03-01), Minalga et al.
patent: 4340002 (1982-07-01), Hanyu et al.
patent: 4664048 (1987-05-01), Naganuma et al.

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