PROBLEM TO BE SOLVED: To provide a rotary tiller set as integrally rotatable in normal direction and reverse direction in right and left both side of a rotary tilling shaft, simplifying configuration and tilling the field into a flat shape in normal rotation and tilling the field to form a ridge in reverse rotation.SOLUTION: The rotary tiller is provided with a right and left tilling shafts 32, 32 switchable as normal rotation or reverse rotation at the lower part of a tilling transmission case 4, and tilling tines 34 mounted on the tilling shafts 32, 32 with curved tips set to face right and left out sides. The tilling tines 34 are mounted to have inclination angles so that the position driving the tine into the soil in the downstream side edge parts locate inside of the right and left position to a position driving the tine into the soil on the upstream side edge in the rotation in tilling with normal rotation, and mounted on the right and left tilling shafts 32, 32, and the tilling tines 34 on both right and left inside are structured to have a larger inclination angle than the inclination angle of the tilling tines 34 on the outside of both right and left side tilling tines 34.COPYRIGHT: (C)2008,JPO&INPIT【課題】ロータリ耕耘装置において、構成を簡単化しながら、正転耕耘で平面状に耕耘し、逆転耕耘で大きな畦を形成する。【解決手段】耕耘伝動ケース4の下部には、正転あるいは逆転切り替え可能な左右耕耘軸32,32を設け、左右耕耘軸32,32には耕耘爪34,…をその先端屈曲部が左右外側に向くように取り付ける。耕耘爪34,…の正転耕耘時において、回転上手側縁部の土中打ち込み位置に対して回転下手側縁部の土中打ち込み位置が左右内側に位置するように傾斜角度を持たせて左右耕耘軸32,32に耕耘爪34,…を取り付け、左右内側部の耕耘爪34,…の傾斜角度を左右外側部の耕耘爪34,…の前記傾斜角度よりも大きく構成する。【選択図】図2
