Data read device
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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Abstract
A data read device includes a read window, and a read section for optically reading a bar code on an article passing across a limited space in front of the window, and for generating output data corresponding to the bar code. The read device further includes a processing circuit for detecting that the article has passed across the limited space, from one side of the window to the other, and cancelling the output data generated from the read section, upon detection of this movement.
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Citations
16 Claims
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1. A data reading device comprising:
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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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A data reading device comprising:
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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; first sensing means for sensing a presence of the article at the first edge portion of said read window and generating a first detection signal when the article is sensed at said first edge portion; second sensing means for sensing a presence of the article at the second edge portion of said read window and generating a second detection signal when the article is sensed at said second edge portion; and processing means including means for checking an order of the detection signals generated by said first and second sensing means, to detect a direction of movement of the article between the first and second edge portions of the read window; and means for invalidating a data signal generated by said read means responsive to detection of said movement of the article being in a direction from said second edge portion to the first edge portion. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16)
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Specification