Abstract A developing apparatus for applying developing material to a photoconductive surface carrying a latent electrostatic image. The apparatus comprises a transport belt for transporting a developer material made up of magnetic carrier particles and electroscopic toner powder in a path past the latent electrostatic image to be developed. Fixed magnets are disposed at the belt ends to provide magnets fields for handling the magnetic developer material. At the development zone, the developer material is not affected by the end magnets but instead by one or more rotatable magnet members disposed on the interior of the transport belt which rotate at a predetermined rate to cause a continuous rolling or cascading action of the developer material across the latent image during development. The belt may be electrically biased to suppress image fields in background areas.
Apparatus for developing a latent electrostatic image comprising transport means for moving development material including a magnetic component and an electroscopic component past a latent electrostatic image to be developed at a predetermined rate and magnet means positioned adjacent the development zone for causing magnetic lines of flux to be moved in the same direction of said transport means at a rate sufficient to effect a wavelike pattern of the development material across the latent electrostatic image during development wherein said transport means comprises an endless belt member and said magnet means comprises at least one rotatable magnet disposed on the interior of said belt member.
Claim 2
Dependent Claim
106 words
Apparatus for developing a latent electrostatic image comprising transport means for moving development material including a magnetic component and an electroscopic component past a latent electrostatic image to be developed at a predetermined rate and magnet means positioned adjacent the development zone for causing magnetic lines of flux to be moved in the same direction of said transport means at a rate sufficient to effect a wavelike pattern of the development material across the latent electrostatic image during development wherein said transport means comprises an endless belt member and said magnet means comprises at least one rotatable magnet disposed on the interior of said belt member.
Claim 3
Dependent Claim
53 words
Apparatus according to claim 1 wherein said endless belt is made of an electrically conductive material and a source of potential of a polarity the same as that of the latent electrostatic Image being connected to said belt member, the potential being sufficient for suppressing background fields emanating from the latent electrostatic image.
Claim 4
Dependent Claim
54 words
Apparatus according to claim 2 wherein said endless belt is moved in a path past a pair of fixed magnets, one of which is located at one end of a trough containing developer material and the other at the opposite end thereof whereby developer material is selectively moved from and returned to said trough.