Using the “auto-detect the fabric thickness and sensing systems”, with more efficient production of high quality sewing performance and quality, while expanding the scope of the sewing, sewing patterns reached 50. On the one hand line equipped with electronic devices folder (electronic folder line agencies), automatic foot lift pressure institutions to expand the function of making narrow slit in the sew point adjustment, which have better performance; on the other hand, is equipped with superior reliability the control box, easy to use control panel to operate.