A document image processing system is provided with an input portion to input a document image. A signal electrode for transmitting andor receiving an electronic field signal is arranged on a first surface side of the casing. In the middle of a conveyance path from the print means 5 to the seal means 8, there are provided moving means 12 which comes into contact with the packing sheet 7 and moves so that the tension of the packing sheet 7 is held to be a constant value, and position detecting means 33 which detects a moved position of the moving means 12. The lift-up unit 50 moves the seat unit 10 downward when the seat unit 10 is positioned at the driver’s seat position, so that the seat unit 10 is located at a suitable position for driving.