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Data read device

  • US 5,155,345 A
  • Filed: 04/09/1990
  • Issued: 10/13/1992
  • Est. Priority Date: 04/13/1989
  • Status: Expired due to Fees
First Claim
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1. A data reading device comprising:

  • a read window having at least a first edge portion and a second edge portion;

    read means for optically reading a symbol formed on an article passing across a limited space in front of said read window, said read means generating a data signal whenever the read means reads the symbol;

    sensing means for sensing the presence of the article at the first edge portion of said read window, said sensing means generating a detection signal when the article is sensed by said sensing means; and

    processing means including means for checking an order of the data signal and the detection signal generated respectively by said reading means and sensing means, to detect a direction of movement of the article between the first and second edge portions of said read window; and

    means for invalidating a data signal generated by said read means responsive to detection of said movement of said article being in a direction from said second edge portion of said first edge portion.

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