PROBLEM TO BE SOLVED: To solve such problems that the dropping-recovering efficiency of grains stuck in grain straws is low and the load of grading due to the dropping of the grain straws on a sieve increases.SOLUTION: A threshing device includes: a shaking-grading rack 22 having a threshing chamber 12 in which a threshing net 18 is disposed on the lower side of a threshing cylinder 11, a transfer rack portion 24 on the lower side of the threshing chamber 12, a grading sieve 25 arranged on the back side of the transfer rack portion 24, and a grading net 29 arranged below the sieve 25 and a winnower 19 disposed on the lower side of the shaking-grading rack 22. A dust-discharging communication portion H communicating with a dust-discharging treatment device 30 disposed on the rear portion side of the threshing chamber 12 is formed behind the threshing chamber 12, and a front side dropping portion 45 having a front dropping member 54, and a rear side dropping portion 46 having a rear side dropping member 58 having a larger mesh scale than the front side dropping portion 45 are disposed in the lower portion of the dust-discharging communication portion H.COPYRIGHT: (C)2013,JPO&INPIT【課題】穀稈中に刺さり込んだ刺さり粒の落下・回収効率が低く、藁屑のシーブ上への落下により選別の負荷を増加させるという課題がある。【解決手段】扱胴11の下側に扱網18を設けた脱穀室12と、該脱穀室12の下側の移送棚部24と、移送棚部24の後側に配置した選別するシーブ25と、該シーブ25の下方に設けた選別網29とを有する揺動選別棚22を設ける。該揺動選別棚22の下側に唐箕19を設ける。記脱穀室12の後部に、該脱穀室12の後部側方に設けた排塵処理装置30と連通する排塵連通部Hを形成し、排塵連通部Hの下部には、前側漏下体54を有する前側漏下部45と該前側漏下部45よりも目合の大きい後側漏下体58を備える後側漏下部46を設ける。【選択図】図3
