Sewing quality control in sewing machine

A computer-implemented method for sewing quality control in a sewing machine that performs sewing on a sewing workpiece based on sewing pattern data, the method comprising:

• detecting a used length of an upper thread per stitch or per plurality of stitches during sewing operation of the sewing machine;
• calculating, during the sewing operation, a stitch tightness index per sewn stitch or per plurality of sewn stitches based on:
• a stitch length per stitch or per plurality of stitches defined by the sewing pattern data;
• a fabric thickness of the sewing workpiece;
• and detected data of the used length of the upper thread per stitch or per plurality of stitches;
• and
• making notification corresponding to the calculated stitch tightness index per sewn stitch or per plurality of sewn stitches.

A non-transitory computer-readable storage medium storing a program executable by a processor to perform a method for sew quality control in a sewing machine that performs sewing on a sewing workpiece based on sewing pattern data, the program comprising:

• detecting a used length of an upper thread per stitch or per plurality of stitches during sewing operation of the sewing machine;
• calculating, during the sewing operation, a stitch tightness index per sewn stitch or per plurality of sewn stitches based on:
• a stitch length per stitch or per plurality of stitches defined by the sewing pattern data;
• a fabric thickness of the sewing workpiece;
• and detected data of the used length of the upper thread per stitch or per plurality of stitches;
• and
• making notification corresponding to the calculated stitch tightness index per sewn stitch or per plurality of sewn stitches.