PROBLEM TO BE SOLVED: To keep an effective front/rear length of a chaff sieve to be generally fixed regardless of a fin interval adjustment state by a fin interval adjustment mechanism.SOLUTION: An oscillating separation body 14 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 and a fin interval adjustment mechanism 30 adjusting an interval between the fins 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. The fin interval adjustment mechanism 30 enlarges an interval between the fins on the basis of frontward slide movement of the plurality of fins 22 with a rear edge of the chaff sieve 23 as reference and narrows the interval between the fins by rearward slide movement of the plurality of fins 22. A front part of the chaff sieve 23 enters to a lower part of the grain pan 21 in the frontward slide movement of the plurality of the fins 22.SELECTED DRAWING: Figure 2COPYRIGHT: (C)2018,JPO&INPIT【課題】フィン間隔調整機構によるフィン間隔調整状態に拘らず、チャフシーブの有効前後長さを略一定に維持する。【解決手段】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間隔を調整するフィン間隔調整機構30と、を備え、フィン間隔調整機構30は、チャフシーブ23の後端を基準とし、複数のフィン22の前方へのスライド移動に基づいてフィン間隔を広げ、複数のフィン22の後方へのスライド移動に基づいてフィン間隔を狭くし、チャフシーブ23の前部は、複数のフィン22の前方へのスライド移動に際し、グレンパン21の下方に入り込む。【選択図】図2
