This machine modelling natural, line smooth, structure nature, reliable performance, high speed highly effective. Operation space wide, can sew thin, medium thick and the thick tailoring material, sews mark is neatly and artistic. Reasonable but actually, guarantees the seam thin time not corrugation along the feed mechanism, the seam thick time not broken. The strong polling type lubrication system makes this machine performance stably, and the low noise at the high-speed operation.