PROBLEM TO BE SOLVED: To provide a seedling transplanter attaining good traveling performance and operability in rectilinear traveling to improve the accuracy of planting a seedling.SOLUTION: A seedling transplanter includes: a vehicle body frame 1 provided with right and left front wheels 7 and right and left rear wheels 8 a steering member 18 for the right and left front wheels 7 steering angle detection means 70 of a steering angle of the steering member 18 a seedling planting part 9 mounted on a rear side of the vehicle body frame 1 to be lifted vertical position detection means 72 for detecting a vertical position of the seedling planting part 9 from a field surface based on a lifting angle of a lift link mechanism S and a power supply B for supplying a drive force to the right and left front wheels 7 and the right and left rear wheels 8. The seedling transplanter includes: traveling motors 67, 68 operated by the drive force from the power supply B, which are provided on the right and left front wheels 7 and the right and left rear wheels 8, respectively, and a controller 100 provided to make the traveling motors 68 of the right and left rear wheels 8 equal in rotational frequencies when the seedling planting part 9 is at a height of a planting operation in a lowered state and also a steering angle is under a predetermined angle. In performing delicate steering such as correction for rectilinear traveling in the planting operation, the right and left rear wheels 8 can be kept to the same rotational frequency.COPYRIGHT: (C)2014,JPO&INPIT【課題】直進走行時の走行性や操作性を良好とし、苗の植付精度を向上させる苗移植機の提供である。【解決手段】左右前輪7及び左右後輪8を備えた車体フレーム1と、左右前輪7の操舵部材18と、操舵部材18の操舵角度検出手段70と、車体フレーム1の後側に昇降可能に装着された苗植付部9と、昇降リンク機構Sの昇降角度から苗植付部9の圃場面からの上下位置を検出する上下位置検出手段72と、左右の前輪7及び左右の後輪8に駆動力を供給する電源Bとを備えた苗移植機において、電源Bからの駆動力により作動する走行モータ67,68を左右の前輪7及び左右の後輪8に左右それぞれ設け、苗植付部9が下降状態の植付作業高さで、且つ操舵角度が所定角度未満であるときは、左右の後輪8の走行モータ68の回転数を同一にする制御装置100を設ける。植付作業時における直進走行の修正など、細かい操舵を行う際に左右の後輪8の回転が同一に保たれる。【選択図】図6
