The machine adopts automatic lubrication system and the mec-hanisms of the needle-bar,thread tack up and feed dog are exce-llently improved by using the structural alloy steel,therefore the running noises and vibrations are minimized signifiacantly,that the machine is operated under the quiet and comfortable circum-stances to increase the efficiency and the service life of the mac-hine is prolonged also.The machine is recognized as a highly efficient and dreliable,ensures highly improved sewing perfof-mance,and easily adapts to changes of the sewing material.