METHOD OF OPERATING A XEROGRAPHIC COPIER OF THE TRANSFER TYPE

摘要

A xerographic copier includes a pre-clean corona (13) and a transfer corona (12). A developing station (14) employs carrier beads coated with tetrafluoroethylene, which material can film on to the drum. In order to reduce such filming, the pre-clean and transfer corona currents are adjusted to the same polarity and to levels, under a condition of operation of the machine in which no copy sheet is fed through the transfer station, which produce charge densities on the photoconductor element within 0.025 microcoulombs of each other.