Patent ID: 6364549
Filing Date: 2002-04-02
Classification: B41J

Abstract:
A method of determining calibration values for a media advance system of a printer that uses a drive roller for advancing the media and that employs an encoder that is connected to the roller and that provides as output encoder position signals that correlate to the position of the media as the media is advanced in the printer, the method comprising the steps of:advancing through the printer a sheet of calibration media having a series of calibration targets thereon, the drive roller being in a first position before this advancing step is commenced; determining the location of the calibration targets relative to the encoder position signals as the sheet is advanced, thereby to obtain a first set of position data; advancing the sheet through the printer for a second time, the drive roller being in a position different from the first position before the sheet is advanced the second time; determining the location of the calibration targets relative to the encoder position signals as the sheet is advanced the second time, thereby to obtain a second set of position data; and processing the first and second sets of position data to determine for given encoder position signals the corresponding calibration values for the media advance system.