Electronic zigzag sewing machine

Details Electronic zigzag sewing machine Electronic zigzag sewing machine

1988-10-24

1990-09-04

Nerbun, Peter

Sewing

Stitch forming

Zigzag

112235, D05B 306

Patent

active

049534866

ABSTRACT:
Disclosed is an electronic zigzag sewing machine adapted to produce one or more of buttonhole stitch patterns, including several parts to be sequentially stitched, in response to stitch control data stored in a memory unit. The sewing machine includes a vertically extending presser bar, to the lower end of which there is detachably mounted a presser foot for exerting a downwardly directing pressure onto a workpiece. The presser foot is provided with a photo-sensor capable of detecting a longitudinal end of a buttonhole during stitching operation of the buttonhole stitch pattern; a step-up timing, at which one part of the buttonhole stitch pattern proceeds to the next part, can be automatically detected so that the buttonhole stitch pattern can be produced step by step without necessity of manual operation. With another presser foot provided with no photo-sensor means, the operator manipulates a key button when visually determining the step-up timing, in response to which the one part of the buttonhole is likewise renewed to the next part.

REFERENCES:
patent: 4216732 (1980-08-01), Marsh et al.
patent: 4409913 (1983-10-01), Adams et al.
patent: 4502401 (1985-03-01), Asai et al.

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