The upper and lower shafts are driven by high temperature wear resistance gauge belt, with high precision and low noise. Adopt fully enclosed cold automatic lubrication system; Portable needle protector is used Protect machine needle, prevent jumping needle, keep stitches trace beautiful; Every main shaft hole adopts high-precision bearing to ensure light slip and high rotation speed of the transmission, which is durable; Carefully designed bottom line supply mechanism, not easy to strand; After changing the auxiliary parts, it has a variety of functions, such as folding hem, wrapping edge and bone pressing, etc., to improve the working efficiency.