Patent ID: 7181157

Claim:
A duplex image forming device comprising: an image forming device which includes a paper transportation path, a paper feed unit which transports a paper to the paper transportation path, a printing unit which prints an image onto the paper, a discharge tray where the paper printed with the image is discharged, a manual paper feed tray which is attached to a side of the image forming device, and a storage opening which is provided at a side of the image forming device and stores the manual paper feed tray; and a reversible transportation unit which is inserted to a side of the image forming device to cover an upper part of the storage opening, and includes a reversible transportation path that is formed to pass through the storage opening for transporting out to an upstream side of the printing unit, the paper transported from a downstream side of the printing unit in the paper transportation path, wherein the reversible transportation unit includes a main body frame having a contacting surface that contacts against a side of the image forming device, and a motor which drives the means for transporting and is disposed protruding outward from the contacting surface of the main body frame so that at least a part of the motor is disposed in the image forming device when the reversible transportation unit is inserted into the image forming device.