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Vacuum drum purge method and apparatus

  • US 5,062,603 A
  • Filed: 04/25/1990
  • Issued: 11/05/1991
  • Est. Priority Date: 04/25/1990
  • Status: Expired due to Term
First Claim
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1. Apparatus for supplying gas to the vacuum ports of a vacuum drum comprising:

  • a source of vacuum and a source of gas;

    a vacuum drum, including means for rotating said drum;

    said drum including a plurality of vacuum ports on the surface thereof, said vacuum ports communicating with means for selectively exposing said vacuum ports to said vacuum source and said source of gas as said drum rotates, said exposing means comprising a plurality of vacuum passages each having a diameter and extending generally outwardly from the interior of said drum, each of said passages connected with a corresponding vacuum port; and

    valve means for alternately connecting said passages to said vacuum source and to said source of gas, said valve means comprising a channel including at least one adjustable plug positioned in said channel, said plug having a width equal to or greater than the diameter of said vacuum passages.

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