PROBLEM TO BE SOLVED: To provide a sensor device capable of performing a highly precise ridge adjustment.SOLUTION: A crop position sensor device 20 for a root vegetable harvester comprises: a pair of contact pieces 21 a vertical fluctuating part 22 a stationary frame 23 having extension parts 23A and 23B fixed to the vertical fluctuation part 22 and extending to the right and left a parallel link mechanism 24 having link members born on vertical shafts 24A and 24B disposed on the right and left ends of the extension parts 23A and 23B and made movable along a horizontal plane a pair of sensors 25 (25A and 25B) for detecting the transverse motions of the parallel link mechanism 24 and a neutral position holding mechanism 26 for elastically holding the parallel link mechanism 24 in a neutral position. The contract pieces 21 are mounted at their upper end portions on the movable end portions of the parallel link mechanism 24 so that the contact pieces can be freely moved transversely while holding the spacing between the contact pieces.COPYRIGHT: (C)2015,JPO&INPIT【課題】高精度の畦合わせ調整を行うことができるセンサ装置を提供する。【解決手段】根菜収穫機の作物位置センサ装置20は、一対の接触子21と、上下揺動体22と、上下揺動体22に固着され左右に延びる延設部23A,23Bを備えた固定フレーム23と、延設部23A,23Bの左右端部に設けた鉛直軸24A,24Bに軸支され水平面に沿って可動自在なリンク部材を備える平行リンク機構24と、平行リンク機構24の左右の動きを検知する一対のセンサ25(25A,25B)と、平行リンク機構24を中立位置に弾性保持する中立位置保持機構26と、平行リンク機構24の可動端部に接触子21の上端部を装着することで、接触子間の間隔を保持して左右に移動自在に支持する。【選択図】図5
