PROBLEM TO BE SOLVED: To solve the problem in a riding seedling transplanter with a seedling transplantation working implement liftably mounted to a traveling vehicle equipped with steering right and left front wheels and right and left rear wheels, wherein there are still remaining problems in turning operability because an operator has to perform the on-off operation of driving of the working implement and the lifting/lowering operation of the working implement in addition to the turning steering operation of a machine body when turning and therefore cannot concentrate on steering operation when turning.SOLUTION: A travel distance from an operation of steering right and left front wheels to a predetermined angle or more is computed by a travel distance computing means to perform automatic turning control of starting to drive a seedling transplantation working implement after the output of a command of lowering the seedling transplantation working implement according to the travel distance, and a notifying means is provided for notifying that automatic turning control is in progress. The notifying means is configured to notify in such a manner that the lowering timing of the seedling transplantation working implement and the driving start timing of the seedling transplantation working implement is recognized.COPYRIGHT: (C)2014,JPO&INPIT【課題】 操向用の左右前輪と左右後輪を設けた走行車両に苗移植作業装置を昇降自在に装着した乗用型苗移植機において、旋回時に、操縦者は機体の旋回操向操作以外に、作業装置の駆動の入り切り操作や作業装置の上昇・下降操作をしなければならず、旋回時の操向操作に専念できず、未だ、旋回操作性の点において課題があった。【解決手段】 走行距離算出手段にて左右前輪を所定角度以上に操向操作してからの走行距離を算出して、該走行距離に応じて苗移植作業装置が下降する指令を出力した後に苗移植作業装置の駆動を開始する自動旋回制御を行うと共に、自動旋回制御中であることを報知する報知手段を設け、該報知手段は、苗移植作業装置が下降するタイミング及び苗移植作業装置の駆動を開始タイミングも認識できる報知を行う構成とした。【選択図】 図8
