Abstract: An apparatus which develops an electrostatic latent image recorded on a photoconductive member used in an electrophotographic printing machine. The apparatus employs a development material wherein developability degradates as the duration of time that the toner particles remain in the developer housing increases. Developability is significantly improved by periodically adding a flow additive material to the developer material.

Abstract: An apparatus for developing a latent image recorded on a surface is disclosed. The apparatus includes a housing defining a chamber storing a supply of developer material comprising toner. The toner donor member spaced from the surface and being adapted to transport toner to a region opposed from the surface. A magnetic brush conveys the developer material in the chamber of said housing onto said donor member. An electrode member near the surface of a donor roll is electrically biased to detach toner from said donor member as to form a toner cloud for developing the latent image. A vibration system, operatively coupled to said donor member vibrates toner on the surface of the donor member, said vibration system coacting with said electrode member to detach toner from said donor member.

Abstract: A toner comprised of resin particles, magnetite, carbon black, rhodamine charge additive, wax, and a surface mixture of silica, strontium titanate and polyvinylidene fluoride.

Abstract: A toner comprised of resin particles, magnetite, carbon black, rhodamine charge additive, wax, and a surface mixture of aluminum oxide, strontium titanate and polyvinylidene fluoride.