PROBLEM TO BE SOLVED: To provide a seedling transplanter in which when a traveling speed rises excessively during a seedling planting operation, the number of revolutions of an engine or the output of a hydraulic continuously variable transmission is dropped to reduce the traveling speed, to accurately carry out leveling of unevenness of a field by a float and rise and fall of a seedling planting part and to stabilize the planting attitude and planting depth of seedlings.SOLUTION: In a seedling transplanter including a seedling planting part 7 comprising a seedling tank 4 for placing seedlings, seedling planting apparatuses 5 for taking seedlings from the seedling tank 4 and planting the seedlings in a field and a float 6 for sliding on a field surface and leveling the field surface through a liftable and lowerable lift cylinder 8 at the rear part of a traveling vehicle body 3 equipped with an engine 1 and a hydraulic continuously variable transmission 2, the seedling transplanter includes a subfloat 9 for making the front end side of the float vertically rotatable and pivotably supporting the float at the front part of the float 6, and a depth sensor 10 for detecting the vertical rotation of the subfloat 9.COPYRIGHT: (C)2014,JPO&INPIT【課題】苗の植付作業時に走行速度が上がり過ぎると、エンジンの回転数または油圧式無段変速装置の出力を低下させて走行速度を減少させ、フロートによる圃場の凹凸の均しや苗植付部の昇降を正確に行わせ、苗の植付姿勢や植付深さを安定させる苗移植機を提供する。【解決手段】エンジン1及び油圧無段変速装置2を備える走行車体3の後部に、苗を積載する苗タンク4と、苗タンク4から苗を取って圃場に植え付ける苗植付装置5と、圃場面を滑走して均すフロート6からなる苗植付部7を、昇降自在なリフトシリンダ8を介して設けた苗移植機において、フロート6の前部に前端側を上下回動自在にして枢支するサブフロート9を設け、このサブフロート9の上下回動を検出する深度センサ10を設けて構成する。【選択図】 図3
