PROBLEM TO BE SOLVED: To quickly deal with a change of the amount of treated materials at a separation part and to perform control and control release of discharge dust in spite of being a combine harvester using threshed waste straws discharged from a threshing room as a detection object and performing control and control release of discharge dust in a discharge dust path.SOLUTION: A discharge dust control body 50 for opening and closing a discharge dust path 22 and a transfer detection body 51 having a contact action on threshed waste straws at the start part of the conveying path of a waste straw conveying device 40 in order to detect a waste straw transfer from a threshing feed chain 12 of the waste straw conveying device 40 are arranged. A connection means for connecting the transfer detection body 51 to the discharge dust control body 50 is arranged so that the discharge dust control body 50 is changed to an open position when the transfer detection body 51 is in a detection state and the discharge dust control body 50 is changed to a closed position when the transfer detection body 51 is in a non-detection state.COPYRIGHT: (C)2012,JPO&INPIT【課題】扱室から排出される脱穀排ワラを検出対象として排塵経路における排塵の規制や規制解除を行わせるものでありながら、選別部における処理物量の変化に迅速に対応させてその規制や規制解除を行なわせることができるようにする。【解決手段】排塵経路22を開閉する排塵制御体50、及び排ワラ搬送装置40の脱穀フィードチェーン12からの排ワラ受継ぎを検出するように、排ワラ搬送装置40の搬送経路の始端部において脱穀排ワラに接触作用する受継ぎ検出体51を設けてある。受継ぎ検出体51が検出状態にあると、排塵制御体50が開き姿勢に切り換わり、受継ぎ検出体51が非検出状態にあると、排塵制御体50が閉じ姿勢に切り換わるように、受継ぎ検出体51と排塵制御体50とを連係させる連係手段を設けてある。【選択図】図2
