PROBLEM TO BE SOLVED: To provide a thresher not only promoting the filtration of a material to be treated by a threshing net under a condition with a large load, but also preventing an allophone from being caused in a threshing chamber without limiting the conveyance to a waste dust-treating chamber to reduce the loss of fourth grain.SOLUTION: The thresher is equipped with the threshing chamber 66 having a threshing cylinder 69 hung by a shaft, a recovering chamber 66a having a recovering cylinder 69b hung by a shaft, at the terminal end side of the threshing cylinder 69 in the conveyance direction, the threshing net 74 for filtering the material to be treated in the threshing chamber 66, the waste dust-treating chamber 68 having a waste dust-treating cylinder 71 for conveying and treating the material to be treated from the threshing cylinder 69, and hung by a shaft, and a guide plate 84 having a plate-shaped flat part in the direction nearly orthogonal to the shaft center of the threshing cylinder 69, imparting conveyance resistance to the material to be treated, and guiding the conveyance of the material to be treated to the waste dust-treating chamber 68 side at the vicinity of a communicating opening 101 from the threshing chamber 66 to the waste dust-treating chamber 68. Not only the rearward flow of the material to be treated is properly limited even under the condition with the large load, and the filtration by the threshing net 74 is promoted, but also the material to be treated is properly conveyed to the waste dust-treating chamber 68 and the allophone in the threshing chamber 66 is prevented, by regulating the guide plate 84 so as not to have a lead angle.COPYRIGHT: (C)2009,JPO&INPIT【課題】負荷が大きい条件下でも扱網による被処理物のろ過を促進すると共に、排塵処理室への搬送を制限せず扱室内の異音発生を防止し、四番穀粒のロス低減を図る脱穀装置の提供である。【解決手段】扱胴69を軸架した扱室66と、扱胴69の搬送方向終端部側の回収胴69bを軸架した回収室66aと、扱室66内の被処理物をろ過する扱網74と、扱胴69からの被処理物を搬送処理する排塵処理胴71を軸架した排塵処理室68と、扱室66から排塵処理室68への連通口101近傍に、扱胴69軸芯と略直交する方向に板状平面部を有し、扱室66内の被処理物に搬送抵抗を与えると共に排塵処理室
