To provide a combine which performs a harvesting operation while running in a field so that a rotation speed sensor for detecting a rotation speed of a conveying screw of a threshing device can accurately detect a rotation number, So as not to notify a false alarm that it is becoming wrong.SOLUTION: The first conveyor 24 and the second conveyor 25 are provided below the swing sorting shelf 22, and at the terminal end of the first conveyor 24, the lower part of a grain refining device 26 for grain refining grain tank 5 is connected , And a secondary reduction device 30 for reducing the secondary object to a predetermined position on the starting end side of the swinging sorting shelf 22 is provided at the end of the secondary conveyor 25. Either or both of the crowning device 26 and the secondary reduction device 30 , The width of the detection end 40A of the rotation detection section 40 on the side of the rotation shaft 38 is made smaller than the width of the detection section 33A of the rotation number sensor 33 And is formed to be equal to or less than that of the combine.(FIG.【課題】本発明は、圃場を走行しながら収穫作業を行うコンバインにおいて、脱穀装置の搬送スクリューの回転速度を検出する回転速度センサが正確に回転数を検出できるようにして、脱穀装置が不良になっているとの誤警報を報知しないようにすることを課題とする。【解決手段】揺動選別棚22の下方に一番コンベア24と二番コンベア25を設け、一番コンベア24の終端にはグレンタンク5に穀粒を揚穀する揚穀装置26の下部を接続し、二番コンベア25の終端に揺動選別棚22の始端側所定位置に二番物を還元させる二番還元装置30を設け、揚穀装置26と二番還元装置30のいずれか、または両方の搬送螺旋31の回転軸38の回転を検出する回転数センサ33を設けたコンバインにおいて、回転軸38側の回転検出部40の検出端40Aの幅を、回転数センサ33の感知部33Aの幅と同等以下に形成したことを特徴とするコンバイン。【選択図】図8
