1.Adopting rolling guild way with three-point support,cutting accuracy could be maintained well. 2.Retangular blade has four edges to extend service life. 3.The cutting angle could be adjusted to reduce the amount if deformation of the sheet. 4.Blade gap could be adjustable accurately and rapidly;the top blade stroke could be adjusted stepless to improve cutting rate. 5.Matching variety of back guages and blade gaps which controled by CNC system.