Patent ID: 6733101
Filing Date: 2004-05-11
Classification: B41J,G06K

Abstract:
A printing apparatus for printing an image on a printing medium which is being conveyed, by performing line by line printing using a print head, comprising:read means for reading out image data from a memory in units of print lines; driving means for driving conveying means which conveys the printing medium; image formation means for controlling the conveying means to repeatedly convey the printing medium and printing the image data read out by said read means on the printing medium to form an image on the printing medium; detecting means for detecting marks formed on the printing medium at a predetermined interval in the conveyance direction; measurement means for measuring a driving amount of said driving means necessary for conveying the printing medium for a distance between two marks; setting means for setting a correction amount based on a result of measurement by said measurement means, said setting means determining the number of lines in the conveying direction to be printed between two marks as the correction amount; and correction means for executing a magnification process in a direction of conveyance of the printing medium on the basis of the number of lines determined by said setting means, to correct an image printing length, the magnification process changing the image printing length in the direction of conveyance by processing the image data.