| 摘要 |
PROBLEM TO BE SOLVED: To calmly and surely rotate a rotating cylinder at a low torque by arranging a driving roller and a driven roller in the mutually opposed state on the outside and inside of one circumferential wall part of the rotating cylinder having a filter screen for removing the dust in air spread thereon, and supporting the rollers at the tips of roller support arms. SOLUTION: The rotary screen of a thresher in a general purpose combine comprises a rotating cylinder 41 having a filter screen 40 spread thereon, which is rotatably arranged in a rotary screen setting space. In order to rotate the rotating cylindrical body 41, a driving roller 46 and a driven roller 47 are arranged in the opposed state on the outside and inside of one circumferential wall part 41a of the rotating cylindrical body 41. The base ends of a pair of roller support arms 49, 50 are pivotally supported on an arm support shaft 48, and the driving roller 46 and the driven roller 47 are supported at the tip of each roller support arm 49, 50. The driving roller 46 is rotated through a worm screw 61 and a worm wheel 46c by the drive of an electric motor 60. |
