METHOD FOR CUTTING BAND TYPE MATERIAL AND ITS DEVICE

PURPOSE:To enable precise cutting without generating burr and shear droop and end material by applying force crossing at right angle to faces and reversing with each other with V-shape cross sectional grooves carved in the longitudinal direction on opposite positions on both faces of a band type material as boundary. CONSTITUTION:When a band type material 8 to be cut is inserted between rollers of a roller pair 17 in the longitudinal direction from the left side, the material 8 is engaged by an upper roller 26 and a lower roller 27 and fed to the longitudinal direction, and annular cutting edges 26a, 27a of the upper and lower rollers 26, 27 are put into both the faces of the material, and V-shape cross sectional shape grooves 8a, 8b extending in the longitudinal direction are carved on the same positions of both the faces. Next, the material 8 is put into a roller pair 18 and subject to shearing force of a direction crossing at right angle to faces along the grooves between a upper roller 28 and a lower roller29. That is, it is subject to downward force by being engaged between a large diameter potion 28a and a small diameter portion 29a and at the same time a portion next thereto is engaged between a small diameter portion 28c and a large diameter portion 29c and subject to upward force, and portion 8c of the groove bottoms of 18 the grooves 8a, 8b is broken and burr or shear droop will not be generated.