Patent ID: 7912396
Filing Date: 2011-03-22
Classification: B41J,G03G

Abstract:
1. A controller of an image forming apparatus to automatically switch an operational mode from a duplex mode, in which images are printed onto both sides of a piece of print medium, to a normal mode, in which an image is printed onto one side of the piece of print medium, when the controller determines whether or not print data requires a single page based on whether a quantity of the print data temporarily stored in a memory is a predetermined quantity, to print the print data in the normal printing mode if the print data requires a single page, and to automatically convert the duplex printing mode into the normal printing mode to print the last page of the print data if the print data requires odd-numbered pages exceeding a single page, wherein the controller provides print data on first and second pages in advance of third and fourth pages from among the first to fourth pages stored in the memory to a printing unit based on a First-In First-Out (FIFO) method, and in the case of printing first and second pages on each sides of a paper, provides the second page to the printing unit first based on a Last-In First-Out (LIFO) method, so that the second page is printed in advance of the first page.