Patent ID: 8000620
Filing Date: 2011-08-16
Classification: G03G

Abstract:
1. An image forming apparatus comprising: a moving unit which moves a printing medium; a first roller which faces the moving unit; a second roller which is opposite to the first roller across the moving unit and disposed proximal to a photosensitive body; a power supply which supplies first and second voltages to the first roller and the second roller, respectively; and a controller which controls the power supply to supply either of the first voltage or the second voltage when the printing medium enters between the first roller and the second roller, wherein the controller comprises: a detector to detect at least one of a voltage and a current, which detects a voltage applied to or a current flowing in either the second roller or the first roller according to the respective power supplied thereto; and a transfer determiner to determine at least one of a voltage and a current, which determines a resistance value of the second roller from the detected current and determines a transfer voltage.