PROBLEM TO BE SOLVED: To provide an apparatus for releasing clogging designed to readily perform retention of a position and release thereof at an approaching position of a rotating wheel and easily carry out release of the clogging of reaped grain culms in a joining part with good operation efficiency in a reaping apparatus of a combine harvester.SOLUTION: The reaping apparatus 8 of the combine harvester 100 is designed to reap grain culms after grass-dividing and raising up the grain culms in a plurality of rows and transport the reaped grain culms through a lower transportation mechanism and an upper transportation mechanism to a threshing part 4. In the reaping apparatus, a tension arm 102 equipped with a movable roller 104 having a rotating shaft 107 on the outside of the joining part X and winding a transportation chain of a left lower transportation apparatus 31 and a release lever 103 provided with a roller 112 contacting the side opposite to the joining part of the tension arm 102 are arranged in the joining part X of a right lower transportation apparatus 30 and the left lower transportation apparatus 31. A one-way clutch 208 is interposed between a left driving sprocket 44L for driving the transportation chain of the left lower transportation apparatus 31 and a left lower transportation driving shaft 38L for driving the left driving sprocket 44L.COPYRIGHT: (C)2007,JPO&INPIT【課題】回転輪の接近位置での位置保持およびその解除を容易に行えて、合流部での刈取穀稈の詰まり解除を作業性良く楽に行うことができる詰まり解除装置を提供する。【解決手段】複数条の穀稈を分草、引き起こし後に刈り取って、下部搬送機構、上部搬送機構を介して脱穀部4へ搬送するコンバイン100の刈取装置8において、下部搬送装置30・31の合流部Xに、該合流部Xの外側に回動軸107を有して左下部搬送装置31の搬送チェンを巻回する可動ローラ104を備えるテンションアーム102と、該テンションアーム102の反合流部側に当接するローラ112を備える解除レバー103とを配置し、該左下部搬送装置31の搬送チェンを駆動する左駆動スプロケット44Lと該左駆動スプロケット44Lを駆動する左下部搬送駆動軸38Lとの間に、ワンウェイクラッチ208を介装した。【選択図】図5
