PURPOSE:To surely form, attract and convey an image even when a second surface is printed by providing a means which makes suction force by a suction fan when the second surface is printed higher than that when a first surface is printed. CONSTITUTION:Ordinarily, only a control line 1 is made to be true (turned on) by a CPU 39 and a first transistor TR1 is turned on. Besides, a voltage set by a resistance R1 is impressed on a suction fan motor 37 and the rotating speed of the motor 37 is set low. When a recording paper is supplied from a resupply position, only a control line 2 is made to be true by the CPU 39 and a second transistor TR2 is turned on. Besides, a voltage set by a resistance R2 is impressed on the motor 37 and the rotating speed of the motor 37 is set high. Therefore, in such a case, the suction force of the suction fan 20 is strong and the recording paper is attracted to a conveying guide 21 by sufficient force.