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Magnetic reel reading device

  • US 4,071,246 A
  • Filed: 08/18/1976
  • Issued: 01/31/1978
  • Est. Priority Date: 08/18/1976
  • Status: Expired due to Term
First Claim
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1. Means for detecting the position of a reel having a portion of magnetic material in an outer cylindrical rim portion with a first plurality of aligned openings formed in said magnetic material and circumferentially spaced about the rim portion, comprising, a first magnetic detector mounted adjacent said openings in said magnetic material such that an output pulse is produced each time an opening passes said detector, a counting means receiving the output of said first magnetic detector, an indexing opening formed in the magnetic material in said reel offset from said first plurality of openings, a second magnetic detector mounted adjacent said reel, an indexing pulse produced each time said indexing opening passes said second magnetic detector, the output of said second magnetic detector being connected to a reset terminal of said counting means, and said cylindrical rim being of magnetic material and said first plurality of openings and said indexing opening being formed in said rim.

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