Patent ID: 7444095
Filing Date: 2008-10-28
Classification: G03G

Abstract:
1. In an image forming apparatus having no two-sided printing mechanism for reversing a paper sheet and automatically printing on two sides of the paper sheet, an image forming apparatus comprising: a means for setting a two-sided printing instruction to print on both of front and back sides of a paper sheet and a two-sided printing mode not accepting any other data than given data, in response to printing data being given; a front side printing executing means for printing front side printing data among the given printing data on the paper sheet and discharging the printed paper sheet to the outside of the apparatus in the two-sided printing mode; an OK signal detecting means for detecting a signal indicating a user's approval of executing predetermined assisting actions after the two-sided printing mode is set; a time measuring means for starting time measurement at the end of printing executed by the front side printing means, in response to the OK signal detecting means detecting the signal; a means for detecting whether a paper sheet has been set in a predetermined paper feed section or not by the time the measuring means measures a predetermined time; a back side printing executing means for taking a paper sheet in response to the paper detecting means detecting that the paper sheet is set, printing back side printing data among the given printing data on the paper sheet and discharges the printed paper sheet to the outside of the apparatus; and a means for releasing the set two-sided printing mode, when a paper sheet has not been set in the predetermined paper feed section by the time the measuring means measures the predetermined time.