PROBLEM TO BE SOLVED: To control reduction in workability caused by strong shock received by each extension part of a rotor plate driven into a hard unplowed land part in operation.SOLUTION: A rotor shaft 4 connected to one end part of the axle of a walking type working machine is equipped with three tilling hatchet tines 6 extended from the rotor shaft 4 outward so that the hatchet tines are positioned at equal intervals in the peripheral direction of the rotor shaft 4 and an approximately triangular rotor plate 3 furnished with three extension parts 3a which are extended outward in the radial direction and are positioned at equal intervals in the peripheral direction. The rotor plate 3 is attached to the other end part of the rotor shaft 4 so that three extension parts 3a are each positioned between the extension end parts 6a of the two tilling hatchet tines 6 in the peripheral direction at positions closer to the extension end parts 6a of the preceding tilling hatchet tines 6 than to the intermediate positions of the extension end parts.COPYRIGHT: (C)2010,JPO&INPIT【課題】 作業時にロータプレートの各延出部が硬い未耕地部分に打ち込まれて強い衝撃を受けることに起因した作業性の低下を抑制する。【解決手段】 歩行型作業機の車軸に一端部を連結するロータ軸4に、ロータ軸4から外方に向けて延出する3本の耕耘なた爪6をロータ軸4の周方向に等間隔で位置するように配備し、径方向の外方に向けて延出し、かつ、周方向に等間隔で位置する3つの延出部3aを備える略三角形状のロータプレート3を備え、3つの延出部3aが、周方向における2本の耕耘なた爪6の延出端部6aの間に、その延出端部間の中間位置よりも先行する耕耘なた爪6の延出端部6aに近い位置に位置するように、ロータプレート3をロータ軸4の他端部に取り付けてある。【選択図】 図3
