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IP.com Disclosure Number: IPCOM000024982D
Original Publication Date: 1983-Apr-30
Included in the Prior Art Database: 2004-Apr-04

Publishing Venue

Xerox Disclosure Journal


In a magnetic brush development system, a magnetic brush developer roller advances developer material into contact with an electrostatic latent image recorded on a photoconductive surface. The unused developer material falls from the developer roller into a crossmixer. The crossmixer also receives additional toner particles from a toner housing in order to maintain the concentration of toner particles within the developer material substantially constant so as to optimize copy quality. The crossmixer is a hollow cylinder with a left-hand helix cut in the interior peripheral surface thereof and a right-hand helix cut on the exterior peripheral surface. In this way, the exterior helix receives a continuous flow of developer material from the magnetic brush developer roller. As the developer material cascades over the exterior thread, some of the developer material will be transported transversely. The interior helix is furnished with developer material on one side of the housing and advances the material to the other side thereof. This produces a balanced flow of developer material.