The chain stitch sewing machine is a specialized industrial sewing machine that is used for creating interlocking loops of thread that form a chain-like stitch. It is commonly used in the textile and garment industries for products such as t-shirts, sportswear, and other knitwear.

The machine uses a needle and looper to create the chain stitch, with the needle piercing the fabric and the looper catching the thread and interlocking it with the previous stitch. The resulting chain-like stitch is strong, flexible, and stretchable, making it ideal for use in knitwear and other stretchy fabrics.

Chain stitch sewing machines can be operated manually or with a motor, and come in various sizes and types for different applications. Some models have multiple needles for creating multiple chain stitch lines at once, while others have a single needle and looper for creating single chain stitch lines.

Chain stitch sewing machines are versatile and can handle a range of fabrics including knits, wovens, and non-wovens. They are known for their speed and efficiency, making them an essential tool for many industrial sewing applications. However, they are not ideal for creating tight and secure seams, as the interlocking loops of the chain stitch can easily unravel if the seam is subjected to stress or tension.