PROBLEM TO BE SOLVED: To prevent posture of a preliminary seedling placement tray from being switched into storage posture unexpectedly.SOLUTION: A posture switch mechanism 9 includes: a rotation support part 10 rotating a preliminary seedling placement tray 8 to change posture between seedling placement posture and storage posture a slide support part 11 supporting the preliminary seedling placement tray 8 to slide front/rear a clutch 12 restricting rotation of the preliminary seedling placement tray 8 in an engagement state and permitting the rotation of the preliminary seedling placement tray 8 in a state in which the engagement is released according to front/rear slide operation of the preliminary seedling placement tray 8 and a spring 13 energizing the preliminary seedling placement tray 8 in the engagement direction of the clutch 12. A preliminary seedling 4 is fed to the preliminary seedling placement tray 8 from a machine body front side and the spring 13 energizes the preliminary seedling placement tray 8 toward a machine body rear side.SELECTED DRAWING: Figure 3COPYRIGHT: (C)2017,JPO&INPIT【課題】予備苗載台トレーの姿勢が不意に格納姿勢に切り換わることを防止する。【解決手段】姿勢切換機構9は、予備苗載台トレー8を苗載置姿勢と格納姿勢とに回動変姿させる回動支持部10と、予備苗載台トレー8を前後スライド自在に支持するスライド支持部11と、噛み合う状態では予備苗載台トレー8の回動を規制し、予備苗載台トレー8の前後スライド操作に応じて噛み合いが解除された状態では予備苗載台トレー8の回動を許容するクラッチ12と、予備苗載台トレー8をクラッチ12が噛み合う方向に付勢するスプリング13と、を備え、予備苗4は、機体前方から予備苗載台トレー8に補給され、スプリング13は、機体後方に向けて予備苗載台トレー8を付勢する。【選択図】図3
