Electrophotographic copier and charging means used therefor

摘要

The application is directed to an apparatus for electrophotographic process, equipped with a charging device (5) of contact type using a conductive roller or brush, and the charging device used therefor. The apparatus is characterized in that the charging voltage applied to a charger roller or brush is depending on the fact that a transfer-treated portion or non transfer-treated portions of the photoconductor surface (1) are in contact with said roller or brush.