Patent ID: 8699936
Filing Date: 2014-04-15
Classification: G03G

Abstract:
1. An image forming apparatus arranged to carry out position adjustment, of a side edge of a sheet, in a width direction intersecting with a sheet conveying direction, and to correct skew feeding of the sheet while conveying the sheet, and wherein the image forming apparatus comprises an image forming portion arranged to form an image on the sheet, the image forming apparatus further comprising: a first conveying portion positioned upstream of the image forming portion in the sheet conveying direction, wherein the first conveying portion is operable to vary its conveying angle and conveying velocity to adjust the skew of the conveyed sheet in a plurality of directions with respect to the sheet conveying direction; a second conveying portion positioned downstream of the first conveying portion in the sheet conveying direction, wherein the second conveying portion is operable to vary its conveying angle and conveying velocity to adjust the skew of the conveyed sheet in a plurality of directions with respect to the sheet conveying direction; a first side edge position detector in a position corresponding to the first conveying portion and arranged to detect a side edge position of the sheet in the width direction; a second side edge position detector in a position corresponding to the second conveying portion and arranged to detect the side edge position of the sheet in the width direction; and a controlling portion arranged to obtain a differential value between the side edge position detected by the first and second side edge position detectors and a target position of the side edge of the sheet for each of the first and second conveying portions, and arranged to control the conveying angle and the conveying velocity of each conveying portion according to the differential value.