This machine adopts built-in direct drive motor, direct drive, sensitive response, accurate positioning; cloth feeding teeth and supporting wheel synchronous feeding, make the fabric more smooth, feeding more smoothly. Connecting rod feeding mechanism of needle thread take-up, looper thread forming a double chain and stitch. In the fixed protection mechanism and dynamic protection mechanism, can effectively prevent the hook line in the motion of the thread, skipping phenomenon.Used jeans side seam, beddings thin package, decorative and shirt, sleeves, pants sutur.