The simple interlock sewing machine is suitable for sewing knitted underwear, sportswear, T-shirts, bras, waistband elastic bands and other elastic fabric necklines, cuffs, etc. The desktop interlock sewing machine is a basic model that can be used for seam sewing. It is suitable for underwear, the neckline of a sweatshirt, and the curling of the cuffs. Desktop interlock sewing machines are derived from a wide variety. A variety of accessories can be installed to achieve a variety of functional stitching, widely used in all kinds of knitted sewing materials, such as underwear pants, cotton trousers, sweatshirts, T-shirts, men and women underwear, also suitable for sewing a variety of styles of knitwear, knitting Outerwear, denim, etc. It is a necessary sewing machine for large-scale production plants for sewing such as piping, rolling collar, elastic band seaming, lace decoration, and curved teeth. Because the interlock sewing machine is mostly used to sew knitted fabrics, it is often used to convey the sewing material by using the feeding power of the two groups of feeding teeth. The conveying power is that the two feeding teeth are relatively independent.