PROBLEM TO BE SOLVED: To prevent the generation of vibration and noise by installing a buffer member absorbing vibration to the outer peripheral surface of a rotor to rotate eccentrically and by making the eccentric distance as small as possible to reduce the driving moment.SOLUTION: A rotary plate (23) is provided in one unit at the tip of a reaping blade input shaft (22), and a crankshaft (24) is installed in the rotary plate (23). A rotor (25) is provided to the crankshaft with free rotation, and a buffer ring (26) composed of resin material is provided in the outer peripheral surface of the rotor (25). The rotor (25) and the reaping blade input shaft (22) are arranged to partly overlap when viewed from the direction of axial center of the reaping blade input shaft.COPYRIGHT: (C)2013,JPO&INPIT【課題】偏心回転する回転体の外周面に振動を吸収する緩衝部材を設けることと、偏心距離をできるだけ小さくして駆動モーメントを低減し、振動、騒音発生の防止を図る。【解決手段】刈刃入力軸(22)の先端に回転プレート(23)を一体で設け、この回転プレート(23)にクランク軸(24)を取り付け、このクランク軸に対して回転自在な回転体(25)を設け、この回転体(25)の外周面には樹脂材からなる緩衝環(26)を備え、回転体(25)と刈刃入力軸(22)とを刈刃入力軸の軸芯方向視で一部重なるように配置する。【選択図】 図6
