PROBLEM TO BE SOLVED: To provide a pretreatment part of a combine harvester in which a threshing depth transporting apparatus is stably and vertically swung by the expansion and contraction operation of a linear actuator to smoothly change threshing depth of grain culm.SOLUTION: In the pretreatment part of a combine harvester in which the threshing depth transporting apparatus 19 is disposed in the middle of a conveying path of grain culms reaped and conveyed backward, the linear actuator 29 in the vertical direction, which vertically swings and drives the threshing depth transporting apparatus 19 by expansion and contraction operation, is arranged and threshing depth of grain culms is changed by the vertical swing of the threshing depth transporting apparatus 19, the upper end side of the linear actuator 29 is connected to and supported on a support frame 33 projected and formed from a transmission case 4, in which a transmission mechanism for transmitting power to the threshing depth transporting apparatus 19 side is built and which constitutes a part of a frame part, to an upper side. On the other hand, the lower end side of the linear actuator 29 is connected to and supported on the rear side of a fulcrum in the lower surface side of the threshing depth transporting apparatus 19 and the threshing depth transporting apparatus 19 is swung to the lower side being a shallow threshing side by the extension operation of the linear actuator 29.COPYRIGHT: (C)2012,JPO&INPIT【課題】直線作動機の伸縮作動によって扱深搬送体を安定的に上下揺動させ、穀稈の扱深さをスムーズに変更できるコンバインの前処理部を提供することを課題としている。【解決手段】刈取られて後方搬送される穀稈の搬送経路の途中に扱深搬送体19を配置し、伸縮作動によって扱深搬送体19を上下揺動駆動させる上下方向の直線作動機29を設け、扱深搬送体19の上下揺動によって変えることにより穀稈の扱深さを変更するコンバインの前処理部において、扱深搬送体19側に動力を伝動する伝動機構が内装されてフレーム部の一部を構成する伝動ケース4から上方側に突出形成された支持フレーム33に前記直線作動機29の上端側を連結支持する一方で、扱深搬送体19の下面側における上記支点よりも後方側に、前記直線作動機29の下端側を連結支持し、直線作動機29の伸長作動によって扱深搬送体19を浅扱ぎ側である下方側に揺動させた。【選択図】図3
