| 摘要 |
PROBLEM TO BE SOLVED: To prevent mutual collision, while a blade is rotating, between cutting members provided on respective peripheries of a pair of saw blades composed of a first blade and a second blade rotated in opposite directions around the same rotary shaft.SOLUTION: Blades 1 and 2 have respective blade bodies 3 and 4 and cutting members 5 and 6 provided on their peripheries. The blade body 3 of the first blade 1 has a first surface opposed to a back face of the blade body 4 of the second blade 2. The cutting members 5 and 6 are formed with projection parts 9 and 10 projecting from their front faces or back faces. The front face and/or the back face have an annular projection part 11 provided inside the cutting member 5, 6, and this annular projection part 11 slides in a corresponding part or the corresponding projection part 11 provided on the opposed back face and/or front face. This projection part 11 is formed of one piece together with the blade body 3, 4, and functions as a spacer for preventing the mutual collision between the cutting members 5 and 6. |
