PROBLEM TO BE SOLVED: To provide a tiller conducting smoothly normal planarly tilling operation and ridging operation.SOLUTION: The tiller includes the following construction: a rotary tilling apparatus (8) can be turned normally and reversely there is provided a tilling frame (41) covering the upper space of the central part of the rotary tilling apparatus (8) the left and right tilling covers (42) on both the left and right sides of the tilling frame (41) are made variable in posture between such an open mode that both the left and right sides of the left and right tilling covers (42) are turned above by a hinge (42a) and such a closed mode that both the left and right sides of the rotary tilling apparatus (8) are covered and there is furnished a guide groove to provide a retreating-travel position, an advancing-travel position, a tilling position and a ridging position, wherein the guide groove is shiftable to either one of the positions by a single variable-speed lever (67).COPYRIGHT: (C)2012,JPO&INPIT【課題】本願発明は、通常の平面耕耘作業と畦立て作業を円滑に行う耕耘機にすることを課題とする。【解決手段】ロータリ耕耘装置(8)を正逆転可能に構成し、ロータリ耕耘装置(8)の中央部上方を覆う耕耘フレーム(41)を設け、耕耘フレーム(41)の左右両側部の左右耕耘カバー(42)をヒンジ(42a)により左右耕耘カバーの左右両側を上方に回動した開放状態と、ロータリ耕耘装置(8)の左右両側部を覆う閉鎖状態とに姿勢変更可能とする構成とし、後進走行位置と前進走行位置と耕耘位置と畦立位置を形成するガイド溝を設け、該ガイド溝を単一の変速レバー(67)でいずれかの位置にシフト可能に構成したとする。【選択図】 図17
