Patent ID: 7885586
Filing Date: 2011-02-08
Classification: G03G

Abstract:
1. An image forming apparatus comprising a registration device adapted to change a first conveying speed of a sheet being conveyed on a conveying path to a second conveying speed at a predetermined position to thereby perform registration of an image on an image bearing member with the sheet, at a position of the image being transferred to the sheet, said image forming apparatus further comprising: a forming device adapted to form a registration-use image on the image bearing member; a registration-use image sensor adapted to detect the registration-use image on the image bearing member to thereby generate a first reference signal; and a sheet detection sensor adapted to detect a top end of the sheet conveyed on the conveying path to thereby generate a second reference signal, wherein said registration device is adapted to determine the predetermined position on the basis of the first reference signal when said registration-use image sensor has successfully generated the first reference signal, and to determine the predetermined position on the basis of the second reference signal when said registration-use image sensor does not successfully generate the first reference signal.