Function：This machine adopts complete-closed auto lubrication systm,main drive adopts timing belt to ensure high speed and less noise, the concerned parts are through special treatment,to improve its wear-resistance capacity; The basic model of this series machine can form basic stitch and covering stitch. On the above-machine basic stitchs,through derivation, it can also be used as special sewing machine to sew nylon zippers and scallops