... stress,high in rigidity.Hydraulic drive,swing beam,return of knife beam is smooth and prompt Frame welded,vibration ... stress,high in rigidity.Hydraulic drive,swing beam,return of knife beam is smooth and prompt by accumulator or ... of the machine. The stroke of knife or beam can be adjusted steplessly,conveniently and fast.Preselection of ... cutting number and cutting strokes. Hydraulic swing beam shear