PROBLEM TO BE SOLVED: To provide a rotary tillage device capable of changing a cutting angle of a tilling claw with a simple structure and sufficiently withstanding reaction force received by the tilling claw from soil.SOLUTION: In a rotary tillage device, a claw fitting flange is provided on an outer periphery of a claw shaft rotatably driven around a shaft center. A fitting base part of a tilling claw is superimposed on the claw fitting flange and fastened to the claw fitting flange by a pair of fitting bolts. The claw fitting flange is provided with a position change admitting hole for changing one fitting bolt to a plurality of fitting positions around the shaft center of the other fitting bolt. The rotary tillage device includes an interposition member to be fitted to the position change admitting hole so as to fill a space between an edge of the position change admitting hole and the one fitting bolt and to position the one fitting bolt to each fitting position.COPYRIGHT: (C)2015,JPO&INPIT【課題】簡単な構造で耕耘爪の切削角を変更でき、かつ耕耘爪が土から受ける反力に十分に耐え得るロータリ耕耘装置を提供する。【解決手段】軸心回りに回転駆動可能な爪軸の外周に爪取付フランジを設け、この爪取付フランジに耕耘爪の取付基部を重ね合わせると共に一対の取付ボルトによって該爪取付フランジに耕耘爪の取付基部を締結し、一方の取付ボルトを他方の取付ボルトの軸心回りの複数の取付位置に位置変更可能とするための位置変更許容穴を前記爪取付フランジに設け、この位置変更許容穴の縁部と前記一方の取付ボルトとの間の空間をうめて該一方の取付ボルトを各取付位置に位置決めすべく、前記位置変更許容穴に嵌め込まれる介装部材を有する。【選択図】図4
