PROBLEM TO BE SOLVED: To achieve the structure simplification and cost-down of a planting unit, and the planting performance improvement of the planting unit, when rice seedlings are thickly planted and thinly planted.SOLUTION: The planting fingers 18 are once rotated in the reverse direction during one rotation of a planting rotator 16 with a stepping motor 24 disposed in the planting rotator 16. The stepping motor is driven and rotated at irregular speed so at to decrease the rotation speed of planting fingers 18 in a phase near to a bottom dead center in the planting rotator 16 during its one rotation, and a rotation speed reduced in a phase near to the bottom dead center of the planting rotator during one rotation of the planting fingers is decreased, when the rotation speed of the planting rotator is increased, or increased, when the rotation speed of the planting rotator is decreased.COPYRIGHT: (C)2010,JPO&INPIT【課題】植付けユニットの構造の簡単化及び低価格化を図るとともに，密植え及び疎植え時の植付け性能を向上する。【解決手段】植付け回転体１６に設けたステッピングモータ２４にて，前記植付け爪体１８を，植付け回転体１６の一回転中に逆方向に一回転する構成であり，このステッピングモータは，植付け爪体１８の回転速度を，その一回転中のうち前記植付け回転体１６における下死点前後付近の位相において減速するように不等速に回転駆動する構成であるとともに，植付け爪体における一回転のうち前記植付け回転体の下死点前後付近の位相での減速した状態の回転速度を，前記植付け回転体の回転速度を速くしたときには遅くし，前記植付け回転体の回転速度を遅くしたときには速くする構成。【選択図】図５
