PROBLEM TO BE SOLVED: To enhance the discharge workability of earth and sand which intrude between adjacent adhesion prevention plates when earth and sand adhere on a face at a working rotor side of a shield cover, in particularly, when the adhesion prevention plates (earth removal materials) are fixed to the shield cover.SOLUTION: In a rotary working machine comprising a working rotor 5 which is attached to a rear of a tractor, and supported to a working machine main body 10 which travels together with the tractor, and a shield cover 2 covering an upper part of the working rotor, the shield cover 2 is formed of a plurality of cover materials 21 which are aligned in the circumferential direction, and openings 21A, 21B for discharging and removing earth and sand splashed up by the working rotor 5 are formed between the circumferentially-adjoining cover materials 21, 21 out of a plurality of the cover materials 21. One or more earth removal materials 4 are fixed to a face at the working rotor 5 side of at least one of the cover material 21 out of a plurality of the cover materials 21, 21 in a position at one side in the circumferential direction.COPYRIGHT: (C)2015,JPO&INPIT【課題】シールドカバーの作業ロータ側に面に付着した土砂、特にシールドカバーに付着防止板(土除け材)が固定された場合の、隣接する付着防止板間に進入した土砂の排出作業性を高める。【解決手段】トラクタの後部に装着され、トラクタと共に走行する作業機本体10に支持される作業ロータ5とその上方を覆うシールドカバー2を備えるロータリ作業機において、シールドカバー2を周方向に配列する複数枚のカバー材21から構成し、この複数枚のカバー材21の内、周方向に隣接するいずれかのカバー材21、21間に、作業ロータ5が跳ね上げる土砂の排除用の開口21A、21Bを形成する。複数枚のカバー材21、21の内、少なくともいずれかのカバー材21の作業ロータ5側の面に、1枚以上の土除け材4をその周方向一方側の位置で固定する。【選択図】図1
