Patent ID: 8862047
Filing Date: 2014-10-14
Classification: G03G

Abstract:
1. An image forming apparatus that comprises an image forming unit for forming an image based on image data processed per page, the image forming apparatus printing an image formed in the image forming unit per page on one surface of a sheet of paper and another image per page on another surface of the same sheet of paper and discharging the sheet of paper, the image forming apparatus comprising: a curl correction apparatus for correcting a curl produced in the sheet of paper on which the images are formed by the image forming unit, the curl correction apparatus configured to be switchable between a first condition in which curl is corrected by curving the sheet of paper towards the one surface of the sheet of paper and a second condition in which curl is corrected by curving the sheet of paper towards the other surface of the sheet of paper; a calculation unit for calculating a coverage rate for the one surface of the sheet of paper and a coverage rate for the other surface of the sheet of paper by counting dots in the image data prior to the image forming unit forming an image; a determination unit for determining whether to switch the curl correction apparatus to the first condition or to the second condition based on the coverage rate calculated by the calculation unit prior to the image forming unit forming an image; a switching unit for switching the curl correction apparatus between the first condition and the second condition based on a result of determination determined by the determination unit prior to the image forming unit forming an image; a main control unit for controlling overall operation of the image forming apparatus; a printing control unit for controlling printing operation executed by the image forming unit; and an image data storage unit for temporarily storing the image data that is to be sent to the image forming unit, wherein the calculation unit is disposed in the main control unit, wherein the determination unit and the switching unit are disposed in the printing control unit, wherein the main control unit transmits a printing instruction to indicate printing of an image per page for each surface of the sheet of paper, and the coverage rate calculated by the calculation unit to the printing control unit, wherein the calculation unit calculates the coverage rate based on the image data stored in the image data storage unit, wherein the printing control unit transmits an image data send instruction for requesting to send the image data temporarily stored in the image data storage unit to the main control unit based on the printing instruction, and wherein the determination unit executes the determination prior to the printing control unit completing sending of all image data send instructions related to the one surface and the other surface of the sheet of paper.