Patent ID: 7926895
Filing Date: 2011-04-19
Classification: B41J

Abstract:
1. A printing apparatus which includes scanning means for moving a printhead in a predetermined direction and causes the printhead to print on a printing medium while causing the scanning means to move the printhead, the apparatus comprising: conveyance means, operable in either a first conveyance mode or a second conveyance mode, for conveying a printing medium in a conveyance direction different from the predetermined direction, wherein said conveyance means includes: a first conveyance roller, provided in a conveyance path of the printing medium, for conveying the printing medium; and a second conveyance roller, provided in the conveyance path of the printing medium at a downstream side from said first conveyance roller with respect to the conveyance direction of the printing medium, for conveying the printing medium, wherein the conveyance is performed in the first conveyance mode by using said first conveyance roller and said second conveyance roller while a pinch roller is pressed against said first conveyance roller, and the conveyance is performed in the second conveyance mode by using said second conveyance roller while the pinch roller is spaced apart from said first conveyance roller; pattern printing means for printing a pattern having a predetermined uniform density in the conveyance direction on the printing medium a plurality of number of times by using the printhead while conveying the printing medium by executing the first conveyance mode and the second conveyance mode and changing a conveyance amount by the conveyance means by a predetermined amount each time one pattern is printed; storage means for storing a first conveyance correction amount obtained from a conveyance amount in executing the first conveyance mode and a second conveyance correction amount obtained from a conveyance amount in executing the second conveyance mode as a conveyance correction amount obtained on the basis of a conveyance amount upon printing a pattern selected from a plurality of patterns printed by said pattern printing means; and conveyance control means for controlling conveyance of the printing medium while correcting the conveyance amount of the printing medium by said conveyance means on the basis of the first conveyance correction amount stored in said storage means so as to print on the printing medium based on image data until the printing medium passes through said first conveyance roller, and further controlling conveyance of the printing medium while correcting the conveyance amount of the printing medium by said conveyance means on the basis of the second conveyance correction amount stored in said storage means after the printing medium has passed through said first conveyance roller.