Browse Prior Art Database

Original Publication Date: 1980-Oct-31
Included in the Prior Art Database: 2004-Apr-02

Publishing Venue

Xerox Disclosure Journal


A magnetic brush development apparatus for use in an electrophotographic copying machine is shown in Figure 1. In Figure 1, the various processing stations in an electrophotographic copy machine is schematically shown around the photo-receptor, which is generally in the shape of a cylindrical drum. The photoreceptor rotates in a dockwise direction as indicated by the arrow. In operation, the photoreceptor is first charged by a corona generating device at a charge station. Then the charged area of the photoreceptor is rotated to the exposure station where it is exposed to a light image of the document to be copied. The electrostatic latent image formed at the exposure station is then advanced through the rotation of the photoreceptor drum to the development station where a magnetic brush development apparatus is shown. The magnetic brush development apparatus is made of two development rolls which are mounted for rotation in the clockwise direction as indicated by the arrows. The developer is contained in the sump formed by the magnetic brush housing and transported upwardly by the bottom development roll onto the top development roll where excess developer is transported by the transport roller back to the sump through the cross mixer. After development, the developed electrostatic latent image is contacted with a support such as a sheet of paper and the latent image is transferred to the paper at the transfer station, where electrostic transfer is accomplished by a corona generating device. After the transfer station, the support having the developed latent image thereon is separated from the photoreceptor and passed on to further processing stations (not shown), and the photoreceptor rotates through a cleaning station where the surface of the photoreceptor is cleaned by a brush cleaning unit. Thereafter, the cycle repeats all over again.