PURPOSE: To prevent the hindrances of the generation of a frictional heat, the surface roughness of a sawing trace, breaking, etc., by planting a link base at the outside where a ring is loosely fitted to the hollow of a saw blade and making an evaporating agent being irradiated on the work face of a saw panel from an air tank.

CONSTITUTION: The air tank of a fitting panel b1 is made relative to the suction hole 3 of a saw panel 11, supported on the cladding faces 5, 51 of saw panels 1, 11 perimeters and fastened to the tip of a freely rotating shaft (a) having an air hole. A ring 6 or disk is loosely fitted to the hollows of the saw panels 1, 11, link bases 7, 7 are arranged on the radiation at the position slightly slided from the center point and a wedge 9 having a groove 10 is engaged at the position where the centrifugal action of the sliding face 8 of the link bases 7, 7 hollow works. The outer peripheral one side of a ring 6 or disk is brought into contact with the local part of the wedge 9 in a crank shape. Saw blades 2, 2 are arranged at the peripheral sides of the saw panels 1, 1 and radiation holes 4, 4 are perforated on the back faces of the saw blades 2, 2.