Patent ID: 8746693

Claim:
An image forming apparatus which forms an image on a first face of a sheet by an image forming portion, and after reversing, forming an image on a second face of the sheet, the image forming apparatus comprising: a sheet conveying path which guides the sheet to the image forming portion so that a center of the sheet in a width direction is positioned over a center of the sheet conveying path in the width direction; a reference member which is disposed along a sheet conveying direction of the sheet conveying path, said reference member provided so as to be rotatable about a downstream end portion of the reference member in the sheet conveying direction; a plurality of skew-conveying rollers which are arranged in the sheet conveying path along the sheet conveying direction and which obliquely convey the sheet toward the reference member so as to abut one side end of the sheet against the reference member so as to regulate a position of the sheet in the width direction; a driving portion which rotates the reference member; and a control portion which, compares a basis weight of the sheet to a predetermined value and when the sheet basis weight of the conveyed sheet is less than the predetermined value, controls the driving portion to rotate the reference member so that an upstream side of the reference member comes closer to the center of the sheet conveying path when regulating the sheet to form the image on the second face than does the driving portion rotate the reference member when an image is formed on the first face.