Heavy Duty Top And Bottom Feed Sewing Machine, use of mounted direct drive servo motor to achieve a?fast start and brake the machine precision. Has the function of automatic calm needle, auto counting down the seam, auto thread trimming, auto reverse sewing, m?auto needle positioning. Is applied to sewing jeans, tents, seat cushions, leather goods ect. This machine the with adoption of automatic Silicone-oil thread lubricating system which guarantee the stable sewing performance, high efficiency and excellent quality. Equipped with big rotary hook. And selflubricating system to reduce bobbin changing and strengthen the hook and other easily damaged parts.