PROBLEM TO BE SOLVED: To steadily move discharged culms such as waste straws from a receiving net to a dust discharging plate.SOLUTION: In the grain threshing machine in which the dust discharging plate is swingably arranged between the dust feed port of a threshing chamber having a threshing cylinder and a shaking separator and a waste dust treating drum and a suction dust discharge fan are successively arranged behind the dust discharging plate, since the waste dust treating drum is arranged perpendicular to the flow of grain culms behind the threshing cylinder, the dust discharging plate is disposed at the lower end edge of the threshing cylinder and yet the dust discharging plate is connected to the shaking separator at the lower end position of the receiving net below the threshing cylinder, waste straws, or the like, threshed by the threshing cylinder are discharged backward from the dust feed port formed at the lower end edge of the threshing cylinder, namely at the rear end edge of the receiving net. In the operation, since the dust discharging plate is arranged according to a standard at the lower end position of the receiving net, discharged culms such as waste straws, or the like, from the receiving net to the dust discharging plate are steadily moved and are smoothly transported to the waste dust treating drum of a next step.COPYRIGHT: (C)2010,JPO&INPIT【課題】受網から排塵板へのワラ屑等の排稈の移行を堅実なものとなすこと。【解決手段】扱胴を有する扱室の送塵口と揺動選別体との間に排塵板を揺動自在に配設し、排塵板の後方に排塵処理胴と吸引排塵ファンとを順次に配設した脱穀機において、排塵処理胴を扱胴の後方に穀稈の流れに直交する状態で配設すると共に、排塵板を扱胴の終端下方に配設し、しかも排塵板は、扱胴下方の受網の下端位置に揺動選別体に連設して配設したので、扱胴により脱穀されたワラ屑等は扱胴の終端下方すなわち受網の後端縁に形成した送塵口から後方に排出されるものであり、この際、受網の下端位置に基準を合わせて排塵板が配設されているので、受網から排塵板へのワラ屑等の排稈の移行を堅実なものとなすことができて、次工程の排塵処理胴へ円滑に移送できる。【選択図】図２
