PROBLEM TO BE SOLVED: To solve a problem that ear breakages or the like tend to occur, when the angular portions of threshing teeth collide with grain straws on threshing, because the threshing teeth formed in a comb-like shape have corner portions at the edges.SOLUTION: A thresher is provided with many plate members 52 having many round hole portions 52b and threshing teeth 52a projected in a tapered state in the outer diameter direction on the outer peripheral surface of a threshing cylinder mounted in a threshing chamber, and chamfered portions 52c or round portions formed at the edges of the rotation direction downstream side surfaces of the threshing teeth 52a. When the threshing teeth 52a collide grain straws, impacts are softened due to the chamfered portions 52c or round portions.COPYRIGHT: (C)2013,JPO&INPIT【課題】櫛状に形成された扱歯はその端に角部を有しており、脱穀時にこの角部が穀稈に衝突することで、穂切れなどが生じ易くなる。【解決手段】扱室に内装される扱胴の外周面に外径方向に向けて先細状に突出する多数の扱歯52a及び丸孔部52bを有する多数のプレート部材52を設け、前記扱歯52aの回転方向下流側面の縁部に面取り部52c又はアール部を形成し、扱歯52aが穀稈に衝突した際に、面取り部52c又はアール部により衝撃が緩和される。【選択図】図7
