What is a three-needle five-thread sewing machine?

The three-needle five-thread sewing machine is a common industrial sewing machine and belongs to the lock sewing machine series. Different from ordinary sewing machines, it has three needles and can sew five threads at the same time, forming a smooth and beautiful stitching line on the fabric. In addition, the three-needle and five-thread sewing machine also has the characteristics of fast sewing speed and high efficiency.