PROBLEM TO BE SOLVED: To suppress the variation of the growing conditions of crops caused by the difference of the quality of soil containing discharged dust plowed into the soil and to attain stable crop yield by laterally scattering the dust discharged from a shaking shelf and the dust discharged from a dust treating chamber.SOLUTION: A side dust outlet 62 opening sideways and a rear dust outlet 63 opening backward are placed at the rear end of a dust treating chamber 45, the side dust outlet 62 is placed above a shaking shelf 53 built in a sorting chamber 26, a discharge guide plate 73 inclined backward is placed at the rear end of the shaking shelf 53, and a dust guiding member 71 having a bottom dust guide plane 70 inclined backward is placed at the side of a grain storage apparatus 7 deviated to the right or left side of the shaking shelf 53 relative to the rear dust outlet 63.COPYRIGHT: (C)2009,JPO&INPIT【課題】揺動選別棚から排出される排塵物と排塵処理室から排出される排塵物とを左右方向に拡散し、これを鋤き込んだ場合の土質の違いによる作物の生育条件のばらつきを少なくして、安定した収穫量を得る。【解決手段】排塵処理室(45)の後端部に側方へ向けて開口する側部排塵口(62)と後方へ向けて開口する後部排塵口(63)を設け、側部排塵口(62)を選別室(26)に内装した揺動選別棚(53)の上側に配置し、揺動選別棚(53)の後端部に後下がり傾斜姿勢の排出案内板(73)を設け、後部排塵口(63)のうちの揺動選別棚(53)から左右方向に偏倚した穀粒貯留装置(7)側の部位に、後下がり傾斜姿勢の底部排塵案内面(70)を有する排塵案内体(71)を設ける。【選択図】図7
