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Method of printing, evaluating and checking the printing image of a printer and apparatus for carrying out said process

  • US 4,587,411 A
  • Filed: 01/04/1984
  • Issued: 05/06/1986
  • Est. Priority Date: 01/04/1983
  • Status: Expired due to Fees
First Claim
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1. A method for printing and checking a printing image of an electrically-operated thermoprinter comprising the steps of:

  • (a) inputting into the printer data to be printed;

    (b) transporting through the printer a web of paper to be printed;

    (c) printing the printing image on the paper wherein the printing image has a plurality of print lines and print characters for each print line are generated line by line;

    (d) after printing of the first print line and prior to finishing printing of the printing image, scanning and sensing the just-printed portion of the printing image;

    (e) comparing the sensed just-printed portion of the printing image with the input data; and

    (f) upon detection of an error from the comparing step and prior to finishing printing of the printing image, rendering the printing image as unusable by the printer marking the printing image visually as a false print.

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