| 摘要 |
<p>An automatic height-of-cut control for a crop harvesting implement such as a swather comprising a sensor disposed behind the cutting bar for indicating the cut crop material length. In one embodiment the sensor is positioned by a cable and pulley mechanism in relation to the cutting bar height such that for every position of the cutting bar there is a corresponding sensor position providing a preselected stubble to crop height ratio. A controller filters the sensor output which positions an electrohydraulic valve to either raise, lower or maintain the swather table by means of a hydraulic actuator. Additional means provide maximum and minimum stubble height, and override means for manual operation.</p> |
