PROBLEM TO BE SOLVED: To increase recovery efficiency of grain by bringing the grain in a substance to be treated on a swinging separation shelf to be not discharged outward of a machine together with straw dust, e.g., when turning the machine after finishing reaping of one side of a farm field.SOLUTION: There is installed a control unit (CU) which automatically cuts off a first clutch (4h) for driving a reaping device (4) when a non-reaping operation height is detected by a height detection means (4l) and automatically cuts off a second clutch (20m) for driving a feed chain (13B) and the swinging separation shelf (20) in addition to the cutting off of the first clutch (4h) when the non-reaping operation height is detected by the height detection means (4l) and a layer thickness thinner than a predetermined layer thickness is detected by a layer thickness detection means (96).COPYRIGHT: (C)2012,JPO&INPIT【課題】例えば圃場の一辺を刈り終えて旋回する際に、揺動選別棚上の処理物中の穀粒が藁屑と共に機外へ排出されにくいものとし、穀粒の回収効率を高める。【解決手段】高さ検出手段(4l)によって非刈取作業高さが検出された場合に刈取装置(4)駆動用の第1クラッチ(4h)を自動的に遮断し、高さ検出手段(4l)によって非刈取作業高さが検出され且つ層厚検出手段(96)によって予め設定した層厚よりも薄い層厚が検出された場合には第1クラッチ(4h)の遮断に加えてフィードチェン(13B)及び揺動選別棚(20)駆動用の第2クラッチ(20m)を自動的に遮断する制御装置(CU)を設ける。【選択図】 図12
