Measurement of paper speed using laser speckle detection

Details Measurement of paper speed using laser speckle detection Measurement of paper speed using laser speckle detection

B - Operations, Transporting

41

J

B41J 2/01 (2006.01) B41J 3/01 (2006.01) B41J 11/00 (2006.01) B41J 11/42 (2006.01) B41J 13/12 (2006.01) B41L 47/26 (2006.01) G01P 3/36 (2006.01) G07B 17/00 (2006.01)

Patent

CA 2256237

In a postage printing device, a printer is employed to print postage indicia on mail pieces. The printer is preferably a noncontact printer such as an ink-jet printer. Printing occurs as the mail piece moves relative to the print head of the printer, which requires that reliable motion information (e.g. a print clock signal) be made available to the electronics driving the print head. The reliable motion is provided in a noncontact way, preferably by directing a laser beam toward the mail piece and detecting a moving speckle pattern in the light scattered from the mail piece.

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