Main Features: *Improving overall stitch quality: -Optimizing X-Y motion ➞ Efficiency in small stitch length work. -Enhancing the durability of X-Y motion under the overload condition. -Securing the stitching quality by minimizing the multi-speed drop range by 10 rpm. (normally by 50 rpm). -Optimizing the motion of Presser Foot for the better performance in the thick work-piece and thread breakage.