PROBLEM TO BE SOLVED: To solve problems wherein urging force is insufficient because a single spring is mounted to reduce the ground contact pressure for a reaping device and wherein the operation space for a spring mechanism is enlarged because the whole stroke in the vertical direction of the reaping device is supported by the single spring.SOLUTION: The combine harvester includes the reaping device 4 which has a sled body 22 to be lifted upward/downward by a reaping vertical cylinder 19. The combine harvester also includes an auxiliary urging means 20 for urging the reaping device 4 independently from the reaping vertical cylinder 19. The auxiliary urging means 20 is composed of two springs: a wide spring 40 and a narrow spring 41. The auxiliary urging means 20 is attached by inserting the narrow spring 41 into an inner space of the wide spring 40 with a wide coil part 42 of the wide spring 40 winding in the opposite direction from the winding direction of a narrow coil part 43 of the narrow spring 41.COPYRIGHT: (C)2012,JPO&INPIT【課題】刈取装置の接地圧を軽減するために単一のバネを設けているので、付勢力が不足する。単一のバネで刈取装置の上下ストロークの全てを支持するため、バネ機構の作動スペースが大きくなる。【解決手段】橇体22を有し刈取上下シリンダ19により昇降する刈取装置4を設ける。刈取上下シリンダ19とは別に刈取装置4を上昇側に付勢する補助付勢手段20を設ける。補助付勢手段20は、二つの大径バネ40と小径バネ41により構成し、該大径バネ40の大径コイル部42の巻き方向と前記小径バネ41の小径コイル部43の巻き方向とを互いに反対にした状態で該小径バネ41を大径バネ40の内側空間部に挿入して装着する構成としたことを特徴とするコンバイン。【選択図】図3
