PROBLEM TO BE SOLVED: To reverse drive a feed chain, easily remove weeds and the like clogging the feed chain, and improve efficiency of threshing work.SOLUTION: A combine comprises: a first hydraulic stepless speed variator (66) for driving a travel unit (2) and a reaping device (4) a second hydraulic stepless speed variator (10) for driving a feed chain (12) and a controller (100) for controlling speed of the second hydraulic stepless speed variator (10) according to output rotary speed of the first hydraulic stepless speed variator (66), and causing the second hydraulic stepless speed variator (10) to reverse rotate, regardless of output rotary speed of the first hydraulic stepless speed variator (66), based on an operation of operation means (ST) provided on a steering part (T). After the reverse output of the second hydraulic stepless speed variator (10) based on the operation of the operation means (ST) is finished, normal output of the second hydraulic stepless speed variator (10) is started automatically.SELECTED DRAWING: Figure 9COPYRIGHT: (C)2017,JPO&INPIT【課題】フィードチェンを逆転駆動できるものとし、フィードチェンに詰まった雑草等を容易に除去できるものとして脱穀作業の能率を高める。【解決手段】走行装置(2)と刈取装置(4)を駆動する第1油圧式無段変速装置(66)と、フィードチェン(12B)を駆動する第2油圧式無段変速装置(10)と、第1油圧式無段変速装置(66)の出力回転速度に応じて第2油圧式無段変速装置(10)を変速制御すると共に操縦部(T)に備えた操作手段(ST)の操作に基づいて第2油圧式無段変速装置(10)を第1油圧式無段変速装置(66)の出力回転速度に拘わらずに逆転出力させる制御装置(100)を備える。また、操作手段(ST)の操作に基づく第2油圧式無段変速装置(10)の逆転出力が終了した後、第2油圧式無段変速装置(10)の正転出力が自動的に開始される構成とする。【選択図】 図9
