Patent ID: 6889031

Claim:
An image forming apparatus in which a sheet having an image formed on a first side thereof by an image forming portion is again transported to said image forming portion so that an image may be formed on a second side of the sheet, said image forming apparatus comprising: a sheet feeding portion for feeding a sheet to said image forming portion; a re-transport path along which the sheet having the image formed on the first side thereof and again transported to said image forming portion passes; registration means provided upstream of said image forming portion for contacting with the sheet fed from said sheet feeding portion or the sheet having passed along said re-transport path, wherein the registration means forms a loop in the sheet to thereby correct the skew feed of the sheet, and thereafter transports the sheet toward said image forming portion at predetermined timing; and a loop forming space provided upstream of said registration means so as to form the loop, wherein an entrance to said loop forming space for the sheet having passed along said re-transport path is formed downstream of an entrance to said loop forming space for the sheet fed from said sheet feeding portion.