Patent ID: 8036588

Claim:
An image forming apparatus including an image forming section which forms an image on a sheet and a conveyance section which conveys the sheet to the image forming section, the conveyance section comprising: (a) a registration roller, (b) a plurality of pairs of loop forming rollers which cause the sheet to form a loop, provided upstream of the registration roller in a sheet conveyance direction and arranged in a direction perpendicular to the sheet conveyance direction, two pairs of loop forming rollers of the plurality pairs being arranged on opposite sides with respect to a center line in the direction perpendicular to the sheet conveyance direction; (c) a skew detection sensor which detects a skew of the sheet, and (d) a conveyance roller provided upstream of the loop forming roller, which is configured to be slidable in the direction perpendicular to the sheet conveyance direction; and (e) a control section which controls independently each of the plurality pairs of loop forming rollers based on the detected result of the skew detection sensor, wherein when a tension bias force is generated on the sheet by a tension bias which is caused by a difference between a conveyance distance of the sheet conveyed by one pair of loop forming rollers and that conveyed by another pair of loop forming rollers, the conveyance roller is slid by the tension bias force in the direction perpendicular to the sheet conveyance direction.