PROBLEM TO BE SOLVED: To provide a structure that facilitates proper treatment to abrasion of helical blades at low cost, and thereby makes it easy to avoid decrease of threshing capacity due to the abrasion of the helical blades.SOLUTION: When being equipped with helical blades 43 for raking and conveying the reaped grain culm supplied and conveyed toward the front end 41 toward the rear with the rotation of a threshing cylinder 16 in the front end 41 of a threshing cylinder 16, the helical blades 43 are detachably mounted and a conveyance auxiliary guide 51 for assisting the raking and conveying the reaped grain culm using the helical blades 43 is provided, and thereby a portion 51B positioned at the downstream side in the rotation direction of the threshing cylinder 16 is made attachable and detachable.SELECTED DRAWING: Figure 4COPYRIGHT: (C)2017,JPO&INPIT【課題】螺旋羽根などの摩耗に対する適切な処置を簡単かつ安価に行えるようにして、螺旋羽根などの摩耗に起因した脱穀処理能力の低下を回避し易くする構成を提供する。【解決手段】扱胴16の前端部41に、その前端部41に向けて供給搬送された刈取穀稈を、扱胴16の回転に伴って後方に向けて掻き込み搬送する螺旋羽根43を装備する場合に、螺旋羽根43を着脱可能に取付けたり、螺旋羽根43による刈取穀稈の掻き込み搬送を補助する搬送補助ガイド51を設け、扱胴16の回転方向下手側に位置する部分51Bを着脱可能とする。【選択図】図4
