| 摘要 |
PROBLEM TO BE SOLVED: To effectively remove charges on the surface of a print medium even when the frequency of polarity change or the potential of an applied voltage for charging a conveyor belt is varied. SOLUTION: When a voltage applied to a print medium charging roller 16 is zero, the potential on the surface of the print medium 2 in contact with the print medium charging roller 16 on the opposite side of the conveyor belt 1 is detected from the partial voltage of the voltage generated in the print medium charging roller 16. A print medium AC charging pattern signal (applied voltage) to the print medium charging roller 16 is so controlled that the detected potential on the surface of the print medium 2 on the opposite side of the conveyor belt 1 can be suppressed. Consequently, the charges on the surface of the print medium 2 can be effectively removed even when the frequency Lt of the polarity change or the potential Vbp of the conveyor belt AC charging pattern signal (applied voltage) for charging the conveyor belt is varied. COPYRIGHT: (C)2008,JPO&INPIT
|
