According to the purpose, it can be divided into domestic sewing machine, industrial sewing machine and service industry sewing machine in between; according to the driving mode, it can be divided into hand, pedal and electric sewing machine; according to the sewing stitches, it can be divided into Handstitch, bartack stitch, single-thread chainstitch, double-thread or multiple-thread chainstitch, single-thread or multiple-thread covering chainstitch and multiple-thread covering chainstitch sewing machines.
During the sewing process, every time the needle of the sewing machine passes through the sewing material twice, the unit formed by the stitches at its spacing is called a stitch. Many consecutive stitches make up a seam. According to the Chinese national standard GB4514-84, there are 88 kinds of stitches in six categories. Among them, 100 types are single-thread chain stitches, with 7 types in total; 200 types are imitation hand sewing stitches, with 13 types in total; 300 types are double-thread or multi-thread lock stitches, with 27 types in total; 400 types There are 17 types of double-thread or multi-thread chain stitches; 500 types are single-thread or multi-thread chain stitches, and there are 15 types; 600 types are multi-thread covered chain stitches (also known as stretch seams) Stitch), there are 9 kinds in total. Typical stitches include single-thread chain, double-thread lock, double-thread chain, three-thread edging chain, and double-needle four-thread co