PROBLEM TO BE SOLVED: To provide a rotary tiller including a rotary cover which covers the upper side of a rotation trajectory of tilling tines and a mud guard plate disposed along the bottom of the rotary cover in the approximate or contact state, capable of removing substances attached to the mud guard plate efficiently and at a low cost.SOLUTION: The rotary tiller includes the rotary cover 9 which covers the upper side of the rotation trajectory of the tilling tines 8, the mud guard plate 14 disposed along the bottom of the rotary cover 9 in the approximate or contact state, and a removing means for removing the substances A attached to the mud guard plate 14. The rotary tiller includes a fitting 31 for attaching the mud guard plate 14 to the bottom side of the rotary cover 9 in such a way that the state of the mud guard plate can be switched to a movable state in which the mud guard plate is movable in the vertical or longitudinal direction, or to a fixed state in which the mud guard plate is fixed along the bottom side of the rotary cover 9 in the approximate or contact state. The removing means is composed of the fitting 31.COPYRIGHT: (C)2012,JPO&INPIT【課題】耕耘爪の回転軌跡の上方側を覆うロータリカバーと、ロータリカバー下面に近接又は接触状態で沿う防泥板とを備え、低コストで、効率的に、防泥板に付着した付着物の除去を行うことが可能なロータリ耕耘装置を提供することを課題としている。【解決手段】本発明は、耕耘爪8の回転軌跡の上方側を覆うロータリカバー9と、ロータリカバー9下面に近接又は接触状態で沿う防泥板14とを備え、防泥板14に付着した付着物Aを除去する除去手段を設けたロータリ耕耘装置において、上下動又は前後動可能な可動状態と、ロータリカバー9下面側に沿って近接又は接触状態で固定された固定状態とに切換可能に前記防泥板14をロータリカバー9下面側に取付ける取付具31を設け、該取付具31によって前記除去手段を構成する。【選択図】図6
