With two straight needle. Self-lubricated vertical-axis rotating hook for catching thread loops and sliding bar thread take-up. The machine can produce two lines of lockstitch synchro feeding of needle materials being sewn from shilffing knobtype stitch regulator and lever type reverse feeding mechanism permit convenient operation. The arm shaft and hook shaft are supported by ball bearings with synchro toothed belt for driving and plunger pump for lubrication. It is available for stitching shifts, Uniforms, overalls women’s underwear, Jeans, ect. Bar and feed dog ensures even stitches and prevents.