| 摘要 |
<p>A combine not threshing grains from ears of cereal columns while the reaping portion is raising the cereal columns during low-speed traveling harvesting work and not lowering the efficiency of high-speed traveling harvesting work. The drive speed of a reaping portion is switched to either a car-speed synchronous speed copying after a car-speed synchronous pattern which is synchronous with the car speed and increases in proportion to an increase of the car or a predetermined rotational speed generally constant irrespective of the variation of the car speed, and the reaping portion is driven. The combine is characterized by comprising a car-speed sensor for detecting the car speed, a reaping input sensor for detecting the rotational speed of the input shaft driving the reaping portion and switching means for switching the drive speed of the reaping portion to one of a constant low speed, the car-speed synchronous speed, and a constant high speed.</p> |
