| 摘要 |
Charged toner is transferred from an image member to a web of imagable material, such as paper, using an impression cylinder without toner back scatter even at high speed (e.g. more than 150 feet per minute) movement of the paper. A nip is provided between the image member and the impression cylinder. Toner having a first polarity is applied to the image member, and a second face of a paper web is moved into contact with the image member adjacent the nip so that toner transfers from the image member to the web face. An electric potential of a first polarity is applied to the web at the first face prior to and adjacent the nip, the potential of sufficient intensity so as to substantially prevent back scatter. The electrical potential may be applied using an electrical conductive electrode biased (e.g. with a spring) into contact with the first face of the paper web, and connected up to a power supply of a first polarity. Alternatively, the electrical potential may be applied using a corona generating device connected to a power supply of the first polarity and shielded from the impression cylinder. |
