Household sewing machines are divided according to their mechanism and stitch form, and can be roughly summarized as JA type, JB type, JG type, and JH type.
Most of the industrial sewing machines are general-purpose sewing machines, including lock sewing machines, chain sewing machines, quilting machines, overlock sewing machines and interlock sewing machines, among which the lock sewing machine has the highest usage rate. .
There are many ways to classify sewing machines, the more common ones are according to stitches and uses. The stitches of sewing machines can be classified into two categories: lock stitch and chain stitch. The lockstitch is the most common. It consists of two sutures that are intertwined like a rope, and the interweaving point is in the middle of the sewing material. From the cross-section of the stitch, the two stitches look like two locks interlocking each other, so it is called a lock stitch. This kind of stitch is used in sewing materials such as cotton, woolen fabrics or leather with small shrinkage. The front and back have the same shape, like a dotted line. The stitches are densely distributed and the sewing fastness is generally better than manual sewing.
Chain stitch is made up of self-connected or interconnected stitch loops. Commonly used are single-thread chain stitch, double-thread chain stitch and three-thread overlock stitch. The characteristic of this kind of stitching is that the stitching is elastic and can expand and contract with the sewing material without breaking the seam. It is suitable for garments made of threaded elastic fabrics or products and garment blanks that are easily loosened during overlocking.
In addition, sewing machines can be divided into household, industrial, and service industry machines according to their uses. They can also be divided into hand-operated sewing machines, pedal sewing machines, and electric sewing machines according to their driving modes.