Computerized Long arm up and bottom feed lockstitch sewing machine (Full autothread trimming, Auto reverse stitching, Auto pressor-fot lifting and Auto needle postioning) With direct-drive motor Lower working noise and vibration Saving power consumption and improving work efficiency. Equipped with big hook, automatic lubricating system. It has superior sewing capability on heavy duty and multi-layer material. Its link-feeding forward backward machanism minimized stitch length errors.