Adopting a computer direct drive method, the start/stop response is rapid, and the high rigidity frame achieves low vibration and low noise. Equipped with a servo controlled fabric feeding device, a needle bar and thread rod device with synchronization and stroke, low tension sewing is achieved. Adopting oil-free technology eliminates the annoyance of contaminated seam material. Built in multiple knot types, can be used for various knot reinforcement seams of men's/women's clothing, denim, knitted fabrics, and women's underwear.