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Variable sensitivity metal detection system

  • US 4,805,385 A
  • Filed: 12/29/1987
  • Issued: 02/21/1989
  • Est. Priority Date: 12/29/1987
  • Status: Expired due to Term
First Claim
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1. In a forage harvester having a metal detector system for detecting tramp metal moving with crop material through a crop feed, and a pair of feed rolls for feeding crop material through said crop feed, at least one of said feed rolls being movable relative to a metal detector in said metal detector system at varying distances therefrom to induce a noise component in the output signal produced by said metal detector, a method of providing a more uniform detection of tramp metal in said crop material, said method comprising sensing displacement of said one feed roll relative to said metal detector, and varying the sensitivity of said metal detector system in accordance with said displacement.

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