Patent ID: 8744333

Claim:
An image foaming apparatus comprising: an image forming unit for forming an image on paper; a paper feed unit for conveying paper to said image forming unit; a registration roller for conveying paper to a prescribed position; a first conveyance path for conveying paper from said paper feed unit to said registration roller; a conveyance unit for conveying paper on said first conveyance path; a control unit for controlling said conveyance unit; a first sensor and a second sensor for detecting passage of paper on said first conveyance path, said first sensor detecting passage of paper upstream from said second sensor on said first conveyance path; and a second conveyance path connected to said first conveyance path downstream from a detection position of said second sensor on said first conveyance path, wherein said control unit performs first preregistration correction in which conveyance of paper is temporarily stopped in response to said first sensor detecting passage of paper and conveyance of the paper is thereafter resumed, said control unit performs second preregistration correction in which conveyance of paper is temporarily stopped in response to said second sensor detecting passage of paper and conveyance of the paper is thereafter resumed, if a first sheet of paper exists on said first conveyance path or said second conveyance path, said control unit determines whether said first sheet is supplied from said paper feed unit to said first conveyance path or supplied from said second conveyance path to said first conveyance path, when it is determined that said first sheet is supplied from said paper feed unit, said control unit performs said first preregistration correction on a second sheet of paper conveyed following said first sheet, and when it is determined that said first sheet is supplied from said second conveyance path, said control unit performs said second preregistration correction on said second sheet.