PROBLEM TO BE SOLVED: To provide a grain thresher for a full-volume makeup type combine that can prevent simultaneous collision of comb teeth with an object being threshed, while employing a configuration ensuring to operate the comb teeth properly even for the object being threshed that is easily corded.SOLUTION: Comb teeth 41 on a comb body 30 provided at a grain thresher 14 are placed along a first spiral 81 to bring the comb body 30 in line with an axis line. The comb teeth 41 and comb teeth 41 in abutment with the comb teeth 41 in the axial direction of the comb body 30 are disposed to be out of phase and to overlap only partly viewing from the axial direction. A series of comb teeth 41, wherein the adjacent comb teeth 41 overlap partly in the axial direction of the comb body 30, are placed along a second spiral 82, which is coaxial and the same in the winding direction with the first spiral 81, and has a pitch greater compared with the first spiral 81.COPYRIGHT: (C)2010,JPO&INPIT【課題】 全量投入型のコンバインの脱穀装置において、扱歯が脱穀対象物に同時に衝突することを防止できるとともに、縄状になり易い脱穀物であっても適切に扱歯を作用させることができる構成を提供する。【解決手段】脱穀装置14が備える扱胴30の扱歯41は、扱胴30と軸線を一致させる第1螺旋81に沿って並べられる。また、前記扱歯41と、その扱歯41に対して扱胴30の軸方向で隣り合う扱歯41とが、その位相を異ならせるとともに当該軸方向に見て一部のみ重複するように配置される。また、隣り合う扱歯41同士が扱胴30の軸方向で一部重複する一連の扱歯41は、第1螺旋81と同軸かつ巻き方向が同じで当該第1螺旋81よりピッチが大きい第2螺旋82に沿って並べられる。【選択図】図2
