PROBLEM TO BE SOLVED: To compactly attach a grain unloader to a relatively small discharge pipe by devising a structure of attaching a shutter driving device to the discharge pipe.SOLUTION: The grain unloader is configured to swing and open/close a shutter 46 by using an electric motor 50 for opening/closing and a rotary cam 60. The rotary cam 60 and the electric motor 50 for opening/closing are disposed in such a way that the trajectory of movement of the rotary cam 60 and the center line p2 of a motor body of the electric motor 50 for opening/closing are along a side-wall portion 44a in the vertical direction of the discharge pipe 44. A rotation center position p3 of the rotary cam 60 is inclined to one side in the lateral direction relative to the center position y1 in the lateral direction of the discharge pipe 44 in the direction along the horizontal shaft center p1 of the shutter 46, and the center line p2 of the motor body of the electric motor 50 for opening/closing is located on the opposite side from the side to which the rotary cam 60 is inclined with the center position y1 in the lateral direction of the discharge pipe 44 disposed in-between.COPYRIGHT: (C)2012,JPO&INPIT【課題】吐出筒に対するシャッタ駆動装置の取り付け構造を工夫して、比較的小型の吐出筒に対してもコンパクトに装備させることができるようにする。【解決手段】開閉用電動モータ50と回転カム60とを用いてシャッタ46を揺動開閉操作するように構成してあり、回転カム60の移動軌跡と開閉用電動モータ50のモータ本体の中心線p2とが吐出筒44の上下方向の側壁部分44aに沿うように回転カム60と開閉用電動モータ50とを配設し、シャッタ46の横軸心p1に沿う方向における吐出筒44の幅方向での中心位置y1に対して、回転カム60の回転中心位置p3を幅方向での一方側に偏倚させて設けるとともに、開閉用電動モータ50のモータ本体の中心線p2を、吐出筒44の幅方向での中心位置y1を挟んで回転カム60が偏倚した側とは反対側に位置させてある。【選択図】図5
