Function：The thread anti-breakage atructure has the function of cooling the thread and needle. That is why even the machine is running at a very high-speed and a chemical-fibre thread is used, the machine can also work fluently without thread breakage; Adopt servo motor, add to take-up and lower thread cutting devices, function of presser foot take up and accurate orientation system, easy to operate; Elegant stitches can be achieved thanks to adoption of movable needle-holder and adjustable looper-frame. In this way, stitch jump can be avoided and the adjustment of the needle clearance became easier; Differential feed amount can be easily adjusted by using a dial. With a simplified dial designed on the front surface of the machine, the differential feed ratio can be adjusted with ease