: sewing machine, also known as sewing machine, yard sewing machine and bone sewing machine, is generally divided into three lines, four lines and five lines. The main function is generally to prevent the seam of clothing from pilling. The sewing machine can be used not only for hemming, but also for sewing T-shirts, sportswear, underwear, knitting and other fabrics. The sewing machine can cut and sew at the same time, and the stitch is like mesh, which is also suitable for elastic fabrics. Wrapping stitch can be divided into single thread, double thread, three thread, four thread, five thread and so on.
1. Single-thread sewing is a single stitch, which is mainly used for sewing blanket edges;
2. Double-thread sewing is a single-needle double-thread stitch, which is mainly used for sewing elastic parts such as the bottom edge of elastic shirts;
3. Three-thread sewing is a single-needle three-thread stitch, which is a common stitch for ordinary knitted garments, especially for sewing some low-grade garment pieces;
4. Four-thread wrapping is a double-needle four-thread stitch, which is more powerful than three-thread wrapping. It is used to sew pieces of high-grade clothing or parts with more tension and strong friction, such as shoulders and sleeves, especially the sewing of coats.
5. Five-thread wrapping is a double-needle five-thread stitch, which further improves the fastness and production efficiency, and has better elasticity than four-thread wrapping, and is often used for sewing outerwear and mending underwear.