PROBLEM TO BE SOLVED: To provide a separating device of a combine harvester, which can improve the separating accuracy of the separating device to increase the dropping quantity of first grains on a first grain-receiving chute and improve the collection efficiency of the first grains.SOLUTION: In the separating device of the combine harvester, a front chaff sieve is disposed at a place above the first grain-receiving chute on an oscillation separator, a rear chaff sieve is disposed at a place above the second grain-receiving chute, an intermediate chaff sieve is disposed between the front and rear chaff sieves, and the intermediate chaff sieve is disposed just above the upper end portion of a grain-flowing plate so as to span the upper end portion of the grain-flowing plate in the longitudinal direction, whereby separating air flowing in the rear upper direction along the grain-flowing plate flows to pass the intermediate chaff sieve from the lower side to the upper side. Thereby, oscillation separating for separating grains (unhulled rice) from dusts, waste straws and unhulled rice having rachis-branches with the intermediate chaff sieve, and wind-powered separation with separation wind for blowing off the separated dusts and waste straws can be cooperated to increase the amount of the first grains dropped on the first grain-receiving chute. Consequently, the separating accuracy of the separating device is improved to enhance the collection efficiency of the first grains.COPYRIGHT: (C)2011,JPO&INPIT【課題】一番穀粒の回収効率を向上させること。【解決手段】揺動選別体に、一番穀粒受樋の上方に位置させて前部チャフシーブを配設する一方、二番穀粒受樋の上方に位置させて後部チャフシーブを配設し、両前・後部チャフシーブ間には中間部チャフシーブを配設するとともに、中間部チャフシーブは、流穀板の上端部を前後方向に跨ぐようにその上端部の直上方に配設して、流穀板に沿って後上方へ向けて通風される選別風が中間部チャフシーブを下方から上方へ向けて通風するようにした。したがって、中間部チャフシーブによる穀粒(籾)と塵埃や藁屑や枝梗付き籾とを分離する揺動選別と、分離された塵埃や藁屑を吹き飛ばす選別風による風選別とが協働して、一番穀粒受樋への一番穀粒の漏下量を増大させることができる。その結果、選別装置における選別精度を向上させて、一番穀粒の回収効率を向上させることができる。【選択図】図3
