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Roll filter metering arrangement

  • US 4,470,833 A
  • Filed: 12/13/1982
  • Issued: 09/11/1984
  • Est. Priority Date: 12/13/1982
  • Status: Expired due to Term
First Claim
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1. In a filter media advance control system for an automatic roll filter apparatus including a filter housing wherein the filter media is advanced from a supply zone through an air filtering zone and rewound on a rewind spool in a rewind zone including a motor in an electrical circuit,a timer for periodically signaling the circuit to energize the motor to advance the filter media, metering means connected with the electrical circuit responsive to the advance of filter media within the housing signaling the circuit to shut off the motor to limit the advance of the filter media to preselected increments comprising,a metering reel in said metering means secured within the housing for rotation about an axis extending across the interior of the housing adapted to rotate in direct proportion of the lineal advance of the filter media within the housing;

  • a magnet affixed to said metering reel generating a magnetic field over a predetermined arc of the periphery of said reel;

    proximity sensing means including a switch connected with the electrical circuit;

    stationary mounting means supporting said sensing means in radial alignment with said magnet at a preselected distance from the axis of said reel; and

    said sensing means actuated by the magnetic field of said magnet to operate said switch and signal the circuit to shut off the motor at least once during each revolution of the reel.

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