PROBLEM TO BE SOLVED: To provide a waste culm cutting device capable of heightening cutting performance of waste culm by effective arrangement of a fixed receiving blade, reducing carrying-about of straws by a rotary knife, and preventing generation of a trouble such as clogging.SOLUTION: A cutting device (26) for receiving waste culm after being threshed into a cutting chamber (21) and cutting the waste culm is arranged in the rear of a thresher (9), and the cutting device (26) is configured by a fixed receiving blade (23), and a rotary knife (25) rotating around a rotation shaft center (24) in the right-left direction. The fixed receiving blade (23) is arranged approximately right under the rotation shaft center (24) of the rotary knife (25), and an escape angle θ of the cutting blade edge of the fixed receiving blade (23) to the radial direction of a circle centering the rotation shaft center (24) is set to about 45°. A separation body (28) arranged on a little lower position than a horizontal axis line (X) passing through the rotation shaft center (24) of the rotary knife (25), for blocking carrying-about of cut straws is provided on the inner surface of a rear wall plate (27) of the cutting chamber (21).COPYRIGHT: (C)2014,JPO&INPIT【課題】固定受刃の有効配置によって排稈の切断性能を高め、回転刃による藁の持ち回りを少なくし、詰まりなどのトラブルの発生を防止できる排稈切断装置を具現する。【解決手段】脱穀装置(9)の後部に、脱穀処理後の排稈を切断室(21)内に受け入れて切断処理する切断装置(26)を配備し、切断装置(26)を、固定受刃(23)と左右方向の回転軸芯(24)周りに回転する回転刃(25)とから構成し、固定受刃(23)は、回転刃(25)の回転軸心(24)の略真下に配置し、回転軸心(24)を中心とした円の半径方向に対する固定受刃(23)の切断刃縁の逃がし角θを略45°に設定する。切断室(21)の後壁板(27)の内面には、回転刃(25)の回転軸心(24)を通過する水平軸線(X)よりも僅か下方の位置に配置されて切断藁の持ち回りを阻止する分離体(28)を設ける。【選択図】 図3
