PROBLEM TO BE SOLVED: To control a chaff angle of a chaff sieve so that grains are not wastefully discharged out of a machine and are not lost.SOLUTION: A combine harvester incudes: a lateral conveyance part for holding feet of reaped grain culms to laterally convey the grain culms a threshing part for threshing ear tip parts of the grain culms laterally conveyed by the lateral conveyance part a separation part for separating the grain culms threshed in the threshing part and a waste straw treatment part for receiving waste straws from the lateral conveying part after the threshing treatment to perform waste straw treatment. A grain culm detection part 90 for detecting the grain culms carried in the lateral conveyance part and a waste straw detection part 91 for detecting the waste straws carried in the waste straw treatment part are arranged on the combine harvester to control a chaff angle of a chaff sieve 26 arranged on the separation part based on detected results of the grain culm detection part 90 and the waste straw detection part 91.COPYRIGHT: (C)2013,JPO&INPIT【課題】穀粒が無駄に機外に排出されて損失されることがないようにチャフシーブのチャフ角度を制御する。【解決手段】刈り取られた穀稈の株元部を挟持して穀稈を横搬送する横搬送部と、横搬送部により横搬送される穀稈の穂先部を脱穀処理する脱穀部と、脱穀部で脱穀処理された穀粒を選別処理する選別部と、横搬送部から脱穀処理後の排藁を受け継いで排藁処理する排藁処理部とを備えるコンバインにおいて、横搬送部に搬入される穀稈を検出する穀稈検出部90を設けるとともに、排藁処理部に搬入される排藁を検出する排藁検出部91を設けて、穀稈検出部90と排藁検出部91との検出結果に基づいて選別部に設けたチャフシーブ26のチャフ角度を制御する。【選択図】図5
