PROBLEM TO BE SOLVED: To provide a farm implement that does not require backing of a traveling vehicle, enabling offset operation to be carried out efficiently, leaving a small length for an unoperated part at the corner part of a field, to reduce the manual operation load with respect to the unoperated part.SOLUTION: The farm implement 1 is linked to the rear part of a tractor 2 and has an implement body 3 carrying out levee-coating operation of an offset operation by an operation part 5, while moving by the advancing travel of the tractor 2. The farm implement 1 is equipped with an expansion and contraction means 4 for turning the implement body 3, based on the tractor 2. When turning to either direction to the right or to the left at the corner part of the field, while allowing the advancing travel of the tractor 2, the operation part 5 moves in an arc shape, at the vicinity of the corner position P of the corner part of the field, based on the expansion or contraction of the expansion and contraction means 4 so as to draw an expansion-contraction arc-shaped locus A, having a radius of curvature smaller than the radius of curvature of a non-expansion-contraction arc-shaped locus B.COPYRIGHT: (C)2008,JPO&INPIT【課題】走行車のバック走行が不要で、効率よくオフセット作業ができ、しかも、圃場の隅部での未作業部分の長さが短く、未作業部分に対する人力作業負担の軽減を図ることができる農作業機を提供する。【解決手段】農作業機1は、トラクタ2の後部に連結し、トラクタ2の前進走行により移動しながら作業部5でオフセット作業である畦塗り作業をする作業機本体3を備える。農作業機1は、作業機本体3をトラクタ2に対して回動させる伸縮手段4を備える。圃場の隅部において、トラクタ2が前進走行しながら左右いずれか一方に向って旋回する場合、曲率半径が非伸縮円弧状軌跡Bの曲率半径より小さい伸縮円弧状軌跡Aを描くように、作業部5が伸縮手段4の伸縮に基づいて圃場の隅部の角位置Pの近傍を円弧状に移動する。【選択図】図7
