| 摘要 |
<p>An electrographic printing apparatus (10) has a charge retaining member (42) with a relatively high background potential of a first polarity, and a transfer corotron (50) having a relatively high potential of a second polarity providing a transfer region (48) for a transfer of toner to copy sheets (70). A pretransfer baffle (52) disposed adjacent to the transfer corotron to prevent image degradation, especially the halo effect. The pretransfer baffle is charged to a potential approximately the same as the charge retaining member and with the same polarity. A gap is present between the pretransfer baffle and the charge retaining member for the passage of copy sheets to the transfer region, and the copy sheet is brought into contact with the charge retaining member before reaching the transfer region. Preferably the copy sheets are conveyed to the baffle at a relatively large angle, e.g. between 30 DEG and 80 DEG , with respect to the charge retaining member.</p> |
