PROBLEM TO BE SOLVED: To prevent foreign matter such as waste straw having reached a rear edge of a chaff sieve from dropping to a first flow plate to be included at a first spiral.SOLUTION: An oscillating separation body 14 of a threshing separation device includes: a grain pan 21 sending processed objects rearward a chaff sieve 23 arranged in a rear part of the grain pan 21 and making the processed objects drop between a plurality of fins 22 arranged side by side in a front/rear direction a fin interval adjustment mechanism 30 adjusting an interval between the fins 22 by moving the plurality of fins 22 to slide in the front/rear direction while keeping a tilt angle of the plurality of fins 22 to be generally fixed and a first flow plate 26 guiding first objects dropping from the chaff sieve 23 to a first spiral 16. A rear edge of the chaff sieve 23 is located in a rear part of an upper edge position of the first flow plate 26 regardless of a fin interval adjustment state by the fin interval adjustment mechanism 30.SELECTED DRAWING: Figure 2COPYRIGHT: (C)2018,JPO&INPIT【課題】チャフシーブの後端まで到達した藁屑などの夾雑物が一番流板に落下して一番ラセンに混入することを防止する。【解決手段】脱穀選別装置の揺動選別体14は、処理物を後方に流すグレンパン21と、グレンパン21の後方に配置され、前後方向に並列する複数のフィン22間から処理物を漏下させるチャフシーブ23と、複数のフィン22の傾斜角度を略一定に維持したまま、複数のフィン22を前後方向にスライド移動させてフィン22同士の間隔を調整するフィン間隔調整機構30と、前側ほど低くなる傾斜姿勢で配置され、チャフシーブ23から漏下する一番物を一番ラセン16に導く一番流板26と、を備え、チャフシーブ23の後端位置が、フィン間隔調整機構30によるフィン間隔調整状態に拘らず、一番流板26の上端位置よりも後方である。【選択図】図2
