PRESS

PROBLEM TO BE SOLVED: To provide a printing machine having high-reliability devices re- electrifying a photoreceptor for minimizing the transfer of background toner. SOLUTION: This printing machine contains a charge holding face in the form of a photoreceptor belt 10 and corona generating devices 36, 51, 61 re- electrifying the charge holding face. After an image region is developed by discharge region development, the photoreceptor 10 contains the first level which is the voltage level of an electrification region, i.e., a background region, and the second level which is the voltage level of a discharge region, i.e., an image region. The corona re-electrifying devices 36, 51, 61 re-electrify the toner image region and the background region of the photoreceptor 10 to the intermediate electrification level between the first level and the second level. The intermediate re-electrification voltage level prevents the transfer of the background toner to the final support to ensure that the electrification level of the background toner is not inverted to the same polarity as that of the toner in the image region.