PROBLEM TO BE SOLVED: To provide a reaping portion of a combine harvester, which can reduce vibrations and noises generated from the cutting device and stabilize grain culm-cutting performance.SOLUTION: The reaping portion of the combine harvester includes, in the cutting device 23, a plurality of disk-shaped cutting blades 231 for cutting the root sides of grain culms, one disk-shaped auxiliary cutting blade 232 having a smaller diameter than the diameters of the cutting blades 231 and used for cutting the root sides of grain culms, and an actuator 233 for rotating the plurality of the cutting blades 231 and the auxiliary cutting blade 232, wherein the plurality of the cutting blades 231 and the auxiliary cutting blade 232 are arranged on the approximately same straight line in the lateral direction.COPYRIGHT: (C)2010,JPO&INPIT【課題】切断装置から発生する振動および騒音を低減し、かつ穀稈切断性能を安定させることができる、コンバインの刈取部を提供する。【解決手段】コンバインの刈取部において、切断装置23に、穀稈を株元側で切断する複数の円盤形状の切断刃231と、切断刃231よりも小径に構成され、穀稈を株元側で切断する一つの円盤形状の補助切断刃232と、複数の切断刃231および補助切断刃232を回転駆動させるアクチュエータ233とを備えて、複数の切断刃231および補助切断刃232を左右方向に略同一直線上に並べて配置する。【選択図】図4
