PROBLEM TO BE SOLVED: To maintain layer thickness of grain culms in a threshing chamber (packing density of the grain culms in the threshing chamber) to be suitable to a threshing process for reducing threshing loss such as unthreshed grain culms, etc., by performing proper threshing operation while reducing horsepower consumption.SOLUTION: On the front side of a traveling body (2) mounting a threshing device (1), a pre-reaping treatment device (3) is elevatably provided. A chain (6b) is provided to receive grain culms from a transfer end part of a grain culm feeding device (5) provided on the pre-reaping treatment device (3) to be fed to a feed chain (4) provided on the threshing device (1). Between a wheel member at a starting end of transfer and a wheel member in the middle in a transfer direction of three wheel members around which the chain (6b) is wound to support the chain (6b) to the traveling body (2), a chain tension part (45a) to provide tension to the chain (6b) is provided.COPYRIGHT: (C)2012,JPO&INPIT【課題】扱室内部の穀稈の層厚を脱穀処理に適する厚み(扱室内部の穀稈充填度)に保ち、適確な脱粒処理によって扱ぎ残し等の脱穀ロスを減少させると共に、消費馬力を少なくする。【解決手段】脱穀装置(1)を搭載した走行車体(2)の前側に刈取前処理装置(3)を昇降自在に設け、該刈取前処理装置(3)に備えた穀稈供給装置(5)の搬送終端部から脱穀装置(1)に備えたフィードチェン(4)へ穀稈を受け継ぐチェン(6b)を設け、該チェン(6b)を走行車体(2)側に支持し、該チェン(6b)を巻き掛ける3つの輪体のうちの搬送始端部の輪体と搬送方向中間部の輪体との間には、チェン(6b)に張力を与えるチェン張り部(45a)を設ける。【選択図】図12
