Patent ID: 8099037

Claim:
An image forming apparatus comprising: (a) an image forming section which forms an image on a sheet; (b) a conveyance section which conveys the sheet to the image forming section, comprising (1) a registration roller, (2) a plurality of loop forming rollers which cause the sheet to form a first loop, provided upstream of the registration roller in a sheet conveyance direction and arranged in a direction perpendicular to the sheet conveyance direction, (3) a skew detection sensor which detects a skew of the sheet, and (4) a conveyance roller which corrects a tension of the sheet between the plurality of loop forming rollers and the conveyance roller, provided upstream of the loop forming rollers, and (c) a control section which controls a driving of the conveyance section, wherein the control section controls independently each of the plurality of loop forming rollers based on a detected result of the skew detection sensor, and wherein the control section drives the conveyance roller and the plurality of loop forming rollers so that the sheet hits the plurality of loop forming rollers that are stopped, thereby a second loop which corrects the tension of the sheet between the plurality of loop forming rollers and the conveyance roller is formed on the sheet between the plurality of loop forming rollers and the conveyance roller, and the sheet hits the registration roller that is stopped, thereby the sheet is caused to form the first loop between the registration roller and the plurality of loop forming rollers.