PROBLEM TO BE SOLVED: To suppress scattering of grains to the outside of the machine while ensuring sorting accuracy.SOLUTION: A combine 1 includes: a conveyance rail 21 moved vertically in accordance with an amount of grain culms to be supplied to a threshing chamber 9 an oscillation sorting body 14 oscillation-sorting a processing object leaked down from the threshing chamber 9 through a receiving net 13 a chaff sieve 23 arranged in the oscillation sorting body 14 and including plural fins 30 aligned in a front/rear direction a fan 15 generating a sorting wind below the oscillation sorting body 14 and a first object collection part 16 collecting first objects leaked from between the fins 30 of the chaff sieve 23. The chaff sieve 23 facing the first object collection part 16 is divided into a front side chaff sieve 31 and a rear side chaff sieve 32. The front side chaff sieve 31 opens/closes a fin opening degree automatically in linkage with vertical motions of the conveyance rail 21. The rear side chaff sieve 32 maintains a predetermined fin opening degree in no linkage with the vertical motions of the conveyance rail 21.SELECTED DRAWING: Figure 3COPYRIGHT: (C)2017,JPO&INPIT【課題】選別精度を確保しつつ、穀粒の機外飛散を抑制する。【解決手段】扱室9に供給される穀稈の量に応じて上下動する搬送レール21と、受網13を介して扱室9から漏下した処理物を揺動選別する揺動選別体14と、該揺動選別体14に設けられ、前後方向に並列する複数のフィン30を有したチャフシーブ23と、揺動選別体14の下方で選別風を起風する唐箕15と、チャフシーブ23のフィン30間から漏下した一番物を回収する一番物回収部16と、を備えるコンバイン1であって、一番物回収部16に臨むチャフシーブ23を前側チャフシーブ31と後側チャフシーブ32とに分割し、前側チャフシーブ31は、搬送レール21の上下動に連動してフィン開度を自動で開閉し、後側チャフシーブ32は、搬送レール21の上下動に連動せずに所定のフィン開度を維持する。【選択図】図3
