PROBLEM TO BE SOLVED: To provide a combine harvester that can prevent insufficient threshing of grain culms even when the amount of grain culms (quantity of straw) reaped by a reaping apparatus increases, and can prevent grain culms from becoming out of order of their conveyance posture, spilling, etc., even when the amount of grain culms (quantity of straw) reaped by the reaping apparatus decreases, thus improving threshing operability.SOLUTION: The combine harvester includes a stepless variable-speed reaping mechanism for transmitting the travel driving force of the traveling machine body to a reaping apparatus, a variable-speed means for varying the variable-speed ratio for the variable-speed reaping mechanism, and a straw level sensor 140 for detecting the amount of grain culms conveyed by a grain culm conveying mechanism. This combine harvester works as follows: Based on the detection result for the amount of grain culm conveyance detected by the straw level sensor 140, the variable-speed reaping mechanism is controlled by the variable-speed means, and a vehicle speed synchronizing mechanism is controlled, thus the speeds of driving the reaping apparatus and a feed chain are varied respectively.COPYRIGHT: (C)2009,JPO&INPIT【課題】刈取装置によって刈取られる刈取穀稈量(藁量)が増加しても、穀粒の扱き残しを防止でき、且つ刈取装置によって刈取られる刈取穀稈量(藁量)が減少しても、穀稈の搬送姿勢の乱れや稈こぼれ等を防止でき、脱穀作業性を向上できるようにしたコンバインを提供するものである。【解決手段】刈取装置に走行機体の走行駆動力を伝達する無段変速式刈取変速機構と、刈取変速機構の変速比を変更する変速手段と、穀稈搬送機構が搬送する穀稈搬送量を検出する藁量センサ140とを備え、藁量センサ140の穀稈搬送量の検出結果に基づき、変速手段によって刈取変速機構が制御され、且つ刈取変速機構の変速出力によって車速同調機構が制御され、刈取装置の駆動速度と、フィードチェンの駆動速度とがそれぞれ変更されるように構成したものである。【選択図】図5
