PROBLEM TO BE SOLVED: To facilitate switching of a return position of the second one by the second grain lifter in accordance with a crop.SOLUTION: A grain lifting spiral (21b) of the second grain lifter (21) is divided into a lower grain lifting spiral (21ba) and an upper grain lifting spiral (21bb), and a non-spiral part (21e) with no grain lifting spiral is formed between an upper end part of the lower grain lifting spiral (21ba) and a lower end part of the upper grain lifting spiral (21bb). An intermediate discharge tube (21c) is provided at a part in a grain lifting tube (21a) facing the non-spiral part (21e) so that the second one can be supplied to an oscillation sorting shelf via the intermediate discharge tube (21c). A grain lifting blocking flap means (23) including a grain lifting blocking plate (23a) and a flap plate (23b) and an extension grain lifting spiral (24) are alternatively attached to a grain lifting shaft (21d) 10 of the grain lifting spiral (21b) in the non-spiral part (21e).COPYRIGHT: (C)2012,JPO&INPIT【課題】作物に応じて、二番揚穀装置による二番物の還元位置の切り換えを容易に行なえるものとする。【解決手段】二番揚穀装置(21)の揚穀螺旋(21b)を下部揚穀螺旋(21ba)と上部揚穀螺旋(21bb)とに分割して該下部揚穀螺旋(21ba)の上端部と上部揚穀螺旋(21bb)の下端部との間に揚穀螺旋を設けない螺旋空白部(21e)を形成し、揚穀筒体(21a)における該螺旋空白部(21e)に対向する部位に中間取出筒体(21c)を設け、該中間取出筒体(21c)を介して揺動選別棚へ二番物を供給可能な構成とし、螺旋空白部(21e)おける揚穀螺旋(21b)の揚穀軸(21d)に、揚穀阻止板(23a)及び跳ね出し板(23b)からなる揚穀阻止跳ね出し手段(23)と継ぎ足し揚穀螺旋(24)とを択一的に取り付け可能な構成とする。【選択図】図6
