Patent ID: 7542162
Filing Date: 2009-06-02
Classification: H04N

Abstract:
1. An image forming apparatus having an automatic double-side unit and being capable of effecting printing on both surfaces of a paper sheet, comprising: setting section which sets an adjustment mode at a time of effecting printing on both surfaces of the paper sheet; first storage section which stores predetermined image data that is used in the adjustment mode set by the setting section; first control section which executes a control to form an image on a first surface of the sheet using the image data stored in the first storage section, when the setting section sets the adjustment mode; first sensor which measures a size of the image formed on the first surface of the sheet by measuring a passage time of the predetermined image formed on the first surface of the sheet, when the image formed on the first surface of the sheet is subjected to thermal fixation and conveyed; second control section which executes a control to form an image on a second surface of the sheet using the image data stored in the first storage section, when the sheet is reversely fed by the automatic double-side unit; second sensor which measures a size of the image formed on the second surface of the sheet by measuring a passage time of the predetermined image formed on the second surface of the sheet, when the image formed on the second surface of the sheet is subjected to thermal fixation and conveyed; calculation section which calculates correction data for a printing magnification for image formation on the second surface of the sheet, on the basis of a speed of conveyance of the paper sheet, a passage time of the predetermined image measured by the first sensor, and a passage time of the predetermined image measured by the second sensor; and second storage section which stores the correction data calculated by the calculation section.