| 摘要 |
PROBLEM TO BE SOLVED: To reduce production cost while faciliating assembling work. SOLUTION: Rotary blades 401-407 and 411-417 are mounted on two rotary shafts 24, 25 supported on opposed side plates 19, 20 in a freely rotatable manner. Screw parts are provided to the outer peripheral parts of the rotary blade support parts 29, 37 of the rotary shafts 24, 25 and the screw parts screwed with these screw parts are provided to the center holes of the rotary blades. The pitches of the screw parts of the rotary blade support parts 29, 37 of the first and second rotary shafts 24, 25 are same and the winding direction of the screw threads are made reverse mutually. |
