ELECTRONIC ZIGZAG STITCH SEWING MACHINE

摘要

PROBLEM TO BE SOLVED: To provide an electronic zigzag stitch sewing machine that can effect start or end back-tacking of a given pattern following a needle rocking pattern via a simple process and reliably. SOLUTION: Back-tacking patterns of pattern numbers 1 to 9 different from needle rocking patterns are set and stored for back-tacking before or after the needle rocking patterns. Depending on the stitch feed and condense stitch feed specified by needle rocking pattern data and a back-tacking pattern both selectively read out of the memory, the needle rocking mechanism is driven to form a seam of the needle rocking and back-tacking patterns. The back- tacking pattern differing from the needle rocking pattern can offer reliable back-tacking depending on the fabric and thread.