ELECTROSTATIC HOLD DOWN APPARATUS

摘要

Electrostatic hold down apparatus for effecting transfer of a tacky toner image from the photoconductive surface of a drum to a sheet of paper or the like for which the toner has greater affinity than for the drum surface in which the paper is brought to the same potential as a plate extending over an area of and in closely spaced relationship to the drum surface as the paper enters the space between the plate and the drum with the plate being placed at a relatively high negative potential with respect to the drum to cause electrostatic forces to bring the portion of the paper beneath the plate into intimate contact with the drum surface. As the paper leaves the space between the drum and the plate the electrostatic hold down force is relieved so that the paper is easily stripped from the drum and the image, owing to the greater affinity of the tacky toner for the paper, leaves the drum with the paper.