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Sewing machine also known as side sewing machine, edge machine, and bone car, generally divided into three lines, four lines, five lines. The main function is to prevent the sewing head from getting hairy. The sewing machine can not only be used for edge binding, but also used to sew T-shirt, sportswear, underwear, knitting and other fabrics. Sewing machine cutting and sewing can be carried out simultaneously, the thread trace is like mesh, also suitable for elastic fabrics.

The stitching can be divided into single line, double line, three thread, four thread, five thread and six thread.

1. Single line sewing is a single needle and a thread trace, mainly used to sew the edge of blanket; overlock machine

2. Double line sewing is a single needle double line trace, mainly used to sew the elastic parts such as the bottom of elastic sweater;

3. The three thread sewing is a single needle and three thread trace, which is commonly used in general knitting clothing, especially for some low-grade clothing pieces;

4. Four thread sewing is a double needle four thread trace, which increases one needle line than the three-wire sewing, and the strength is improved. It is used for sewing or stretching the garment pieces of high-grade clothing, and the parts with strong friction such as shoulder and sleeve, especially the sewing of coat;

5. The five thread sewing is a double needle five thread trace, which has the advantages of further improvement of fastness and production efficiency, and better elasticity than four thread stitching, and is commonly used in the sewing of coat and mending underwear.

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