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US 6,886,314 B2Granted
Device for measuring and/or checking the distance between a shear bar and a chopping knife
AssigneeDeere & Company
InventorsPeter Pirro, Steffen Clauss
Life of this patent
Estimating the term…
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AssigneeDeere & Company
InventorsPeter Pirro, Steffen Clauss
Estimating the term…
A crop chopping arrangement for a forage harvester includes a shearbar mounted adjacent a path swept by chopping knives of a chopper drum and being selectively adjustable toward and away from said path so as to adjust the distance between the shearbar and knives as they pass by the shearbar. An arrangement for measuring and/or checking the distance between the shearbar and the knives includes a vibration sensor located to measure the mechanical vibrations in the shearbar produced by the moving knives, and an electronic evaluation circuit. The evaluation circuit is operable for performing a frequency analysis of the signal provided by the vibration sensor so as to derive information indicative of the distance between the shearbar and knives.
In a combination including a chopping drum equipped with a plurality of chopping knives arranged about its periphery and rotatable to move said knives so as to trace a path located adjacent a shearbar, with said shearbar being mounted for movement toward and away from a path traced by said knives, a vibration sensor located for detecting mechanical vibrations generated in said shearbar by said chopping knives and producing a signal relating to a strength of said vibration, and an electronic evaluation device connected to said vibration sensor, the improvement comprising:
Dependencies are inferred from the claim text.