Developer material mixing apparatus

Claim 1

An electrophotographic printing machine of the type in which an electrostatic latent image recorded on a photoconductive member is developed with a developer material, wherein the improvement includes, a housing defining a chamber storing a supply of developer material therein; first means for transporting the developer material in a first direction from one region of the chamber of said housing to another region thereof; second means for transporting the developer material in a second direction opposed to the first direction; means, disposed, at least partially in the chamber of said housing, for developing the electrostatic latent image recorded on the photoconductive member with developer material, said developing means receiving developer material from said first means and said second means; and means for separating said first means from said second means, said separating means having an aperture in at least one portion thereof configured to allow developer material to gently move between said first means and said second means and adapted to reduce back up of developer material and flow unevenness, said separating means comprising a generally planar member having a sloped surface and being mounted in said housing between said first means and said second means to define a substantially vertical wall therebetween with said housing and the sloped surface of said planar member defining, in one marginal region, a slot progressively increasing in size in a direction along said planar member toward one end thereof.