| 摘要 |
In a forage harvester having a rotatable cutterhead and adjacently-positioned shearbar, an upper feed roll assembly is mounted above and forwardly of the shearbar. A lower feed assembly cooperates with the upper feed roll assembly to convey crop material to the cutterhead across the shearbar. A tensioning mechanism is coupled to mounting arms for the upper feed roll assembly. First and second positions of the tensioning mechanism provide for a first condition in which the upper feed roll assembly is biased toward a lower operative position adjacent the cutterhead and shearbar and a second condition in which the bias on the upper feed roll assembly is relaxed, permitting movement to an upper inoperative position generally remote from the cutterhead and shearbar to thereby expose and render the shearbar readily accessible for servicing. In the second condition the tensioning mechanism spring is fully compressed and used to directly transfer force used to lift the upper feed roll assembly.
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