PROBLEM TO BE SOLVED: To easily constituting a mechanism for automatically lowering rear wheels for correcting a longitudinal inclining attitude of a machine body by restraining a weight increase and a cost increase in the machine body.SOLUTION: This seedling transplanting machine is constituted by arranging a vehicle body having right-left front wheels and the right-left rear wheels 4, arranging a liftable seedling transplanting part in the rear of the vehicle body, arranging a rear wheel transmission case 34 having a rear wheel shaft 56 and a rear wheel transmission shaft 33 for transmitting from the front side to an input shaft 34b of the rear wheel transmission case 34, vertically rotatably installing the rear wheel transmission case 34 around a rotary fulcrum shaft 54 so that the rear wheel shaft 56 is positioned on the rear side of the rotary fulcrum shaft 54, arranging a compression spring for energizing the rotational movement to the lower side of the rear wheel transmission case 34, arranging regulating members 57 and 58 for regulating a rotational movement area in the vertical direction of the rear wheel transmission case 34, and winding the compression spring around the outer periphery of the regulating members 57 and 58.COPYRIGHT: (C)2010,JPO&INPIT【課題】 本発明の課題は、機体の前後傾斜姿勢を修正するために自動的に後輪を下降させる機構を、機体の重量アップやコストアップを抑えて簡単に構成することにある。【解決手段】 左右の前輪及び左右の後輪(4)を備える車体を設け、該車体の後方には昇降可能な苗植付部を設け、後輪車軸(56)を備える後輪伝動ケース(34)と該後輪伝動ケース(34)の入力軸(34b)へ前側から伝動する後輪伝動軸(33)とを設け、回動支点軸(54)より後側に後輪車軸(56)が位置するように前記後輪伝動ケース(34)を前記回動支点軸(54)回りに上下に回動可能に装着し、後輪伝動ケース(34)の下側への回動を付勢する圧縮スプリングを設け、後輪伝動ケース(34)の上下方向の回動域を規制する規制部材(57,58)を設け、前記圧縮スプリングを規制部材(57,58)の外周に巻回する構成とした苗移植機とした。【選択図】 図4
