Patent ID: 7574167

Claim:
An image forming apparatus which forms images on both sides of a transfer sheet, the image forming apparatus comprising: an image forming device which forms an image on a front surface of the transfer sheet and then forms an image on a rear surface of the transfer sheet; a conveying device for conveying the transfer sheet to the image forming device in a conveyance direction; and a control section for controlling the conveying device, wherein the conveying device comprises: paired registration rollers arranged in a direction perpendicular to the conveyance direction of the transfer sheet for being hit by the transfer sheet; and a tilting device which changes an inclination of the paired registration rollers from the direction perpendicular to the conveyance direction, wherein when forming an image on the front surface of the transfer sheet by the image forming device, the tilting device changes the inclination of the paired registration rollers according to a first skew amount of a first side of the transfer sheet representing a leading edge in the conveyance direction before the transfer sheet hits the paired registration rollers and, after the transfer sheet hits the paired registration rollers, the control section controls so as to convey the transfer sheet while keeping a state of the paired registration rollers whose inclination has been changed by the tilting device, and wherein when forming an image on the rear surface of the transfer sheet by the image forming device, the tilting device changes the inclination of the paired registration rollers according to a second skew amount of a second side of the transfer sheet representing a leading edge in the conveyance direction before the transfer sheet hits the paired registration rollers, and, after the transfer sheet hits the paired registration rollers, the control section controls so as to convey the transfer sheet while keeping a state of the paired registration rollers whose inclination has been changed by the tilting device.