PROBLEM TO BE SOLVED: To satisfactorily perform grain culm supply to a threshing device even if traveling at low speed for harvesting the falling grain culm and wet grain culm, and thereby increase efficiency of harvesting work.SOLUTION: A feed chain drive device of a head-feed combine is provided with: a vehicle speed tuning drive path (A) for transmitting the power of an engine (15) to a feed chain (13) via a hydraulic continuously variable transmission (17) for driving a traveling device (2) and a constant speed drive path (B) for transmitting the power from the engine (15) to the feed chain (13) without going via the hydraulic continuously variable transmission (17) and performing the drive at a predetermined high speed. Also, a falling grain culm reaping operation tool (12) is provided, and the traveling device (2) is driven at a low speed on the basis of the operation of the falling grain culm reaping operation tool (12), and also the feed chain (13) is driven at the high speed via the constant speed drive path (B).SELECTED DRAWING: Figure 2COPYRIGHT: (C)2018,JPO&INPIT【課題】倒伏した穀稈や湿った穀稈を収穫するために低速走行しても脱穀装置への穀稈供給が良好に行えるようにし、収穫作業の能率を高める。【解決手段】エンジン(15)の動力を走行装置(2)駆動用の油圧式無段変速装置(17)を経由して前記フィードチェン(13)に伝動する車速同調駆動経路(A)と、エンジン(15)から油圧式無段変速装置(17)を経由せずにフィードチェン(13)に伝動して所定の高速度で駆動する定速駆動経路(B)とを設ける。また、倒伏穀稈刈取操作具(12)を設け、倒伏穀稈刈取操作具(12)の操作に基づいて、走行装置(2)が低速で駆動されると共に、定速駆動経路(B)を介してフィードチェン(13)が高速駆動される構成とする。【選択図】図2
