| 摘要 |
PURPOSE:To prevent the cleaving of such as a plywood at the cutting, by making a groove having a curved face which has the predetermined inclination angle at the circumference of a round edge while facing it with a round receiving knife. CONSTITUTION:A plurality of grooves 13 having the curved face 12 are etched in the rear face 11 of an edge of a round knife 10 with random interval to form a cutting knife 16. A receiving knife 8 having the predetermined inclination angle is faced against the cutter 16, where the rear face 19 of the receiving knife 18 and the rear face 11 of the cutter 16 are partially overlapped. The board member 17 carried by a carrier 24 will tear the cleaving fiber finely between the rear face 19 of the receiving knife 18 and the rear face 19 of the knife thus to prevent the cleaving. |
