PROBLEM TO BE SOLVED: To solve a problem with a conventional leveling implement wherein unnecessary ridges are formed along right and left side edges as the excessive soil on the surface of a field is pushed away to the right or left side of the leveling implement in the leveling work.SOLUTION: A leveling part 3 includes a leveling support shaft 20 horizontally extending in the lateral direction relative to the direction of advancement of the work, and a plurality of leveling members 21 attached to the leveling support shaft 20 at regular intervals in the longitudinal direction. The leveling part 3 is comb-shaped on the whole. A horizontal laser signal 49 radiated from a laser light emitting device 48 disposed outside the field is received by a light receiving device 41, and a hydraulic cylinder 30 is operated according to the height of the leveling part 3 detected by the light receiving device 41. The leveling part 3 is moved in the vertical direction while retaining the posture at a fixed angle to the surface of the field to control the height by a vertically movable link mechanism 4.COPYRIGHT: (C)2012,JPO&INPIT【課題】均平作業機が、均平作業に伴い、圃場表面の余剰の土を均平作業機の左右側方に掻き分けるようにして押し逃がして左右側縁に沿って不必要な畝が生じるような従来の問題を解決する。【解決手段】均平部3は、作業進行方向に対して横方向に水平に伸びる均平支持軸20に、その長手方向に一定間隔を置いて取り付けられた複数の均平部材21とを有し、全体的に櫛歯状に構成されており、圃場外部に設けられたレーザ発光装置48から放射される水平レーザ信号49を受光装置41で受光して、受光装置41で検出した均平部3の高さに応じて、油圧シリンダ30を動作して上下可動用リンク機構4により、均平部3を圃場表面に対して一定の角度の姿勢を維持して上下に移動させて高さを制御する。【選択図】図1
