| 摘要 |
PURPOSE:To obviate the necessity of minute control of the captioned apparatus and reduce wear-out of a blade by installing a plurality of rotary blades onto the outer peripheral surface of a rotary drum and with installing a flexible fixed blade so that its top edge part crosses the locus of revolution of the top edge of the rotary blade. CONSTITUTION:A rotary drum 4 equipped with a plurality of rotary blades 5 fixed is installed onto the outer periphery of a rotary shaft 2 which is driven by a driving apparatus 3. A fixed blade 7 is installed onto a supporting wall surface 8 opposed to the rotary blade 5 through a sheet 1, so that the blade edge is directed downward through an installation plate 6. The top edge part of the fixed blade 7 is installed so as to cross with the locus of revolution of the blade edge of the rotary blade 5. Said fixed blade 7 is made of flexible material such as spring steel, etc. With such constitution, the rotary blade 5 revolves and its blade edge pushes the sheet 1 onto the fixed blade 7, and when the deflection of the fixed blade 7 increases to the max., the sheet 1 is cut by the shearing force which is concentrated at each top edge of both blades, and the fixed blade 7 is returned to the original position after cutting. |
