PROBLEM TO BE SOLVED: To provide a combine harvester having solved the problem of a conventional jump rack, which is arranged on the extension line of a middle stage air duct so that a separation wind is scattered to become weak by the jump rack thereby to lower the separation accuracy and the separation efficiency.SOLUTION: A thresher comprises: an upper stage air duct 30 for blowing a separation wind flowing from the blow port of a fan casing 20 to a fluctuation separation shelf 22, to the front part of the fluctuation separation shelf 22 and a middle stage air duct 31 for blowing the wind to the middle part of the fluctuation separation shelf 22 and a lower stage air duct 32 for blowing the wind to the rear part of the fluctuation separation shelf 22. The fluctuation separation shelf 22 is equipped with a jump rack 35. This jump rack 35 is arranged between the upper stage air duct 30 and the middle stage air duct 31.COPYRIGHT: (C)2015,JPO&INPIT【課題】従来のジャンプラックは、中段風路の延長線上に配置しているので、選別風がジャンプラックに当たって分散して、選別風が弱まり、選別精度および選別効率が低くなるという課題がある。【解決手段】唐箕ケーシング20の送風口から揺動選別棚22へ向かう選別風を、揺動選別棚22の前部に送風する上段風路30と、揺動選別棚22の中間部に送風する中段風路31と、揺動選別棚22の後部へ送風する下段風路32とを設ける。揺動選別棚22にはジャンプラック35を設ける。ジャンプラック35は、上段風路30と中段風路31の間に配置した脱穀装置。【選択図】図2
