Abstract: A method and apparatus for accessing the uniformity of a charging subsystem with a resolution which enables one to make accurate predictions of customer acceptance of the charging device. The method and apparatus employs a scanner that scans the light emitted from a recording member such as a phosphor coated substrate while the charging device under test is in operation against the substrate, the uniformity of device can be processed using off-the-self image analysis tools. This enables imaging the generated charge pattern with improved spatial resolution and offers a quantitative technique to measure charge uniformity.

Abstract: In accordance with the invention, there is an electrophotographic charging device comprising a first electrode, a second electrode adjacent the first electrode, a plurality of nanotubes adhering to at least one of the first electrode and the second electrode, and a voltage supply electrically connected to the first electrode and the second electrode, wherein the first electrode and the second electrode impart charge to a portion of a gaseous material that is deposited on a receptor.

Abstract: In a xerographic printing apparatus, a scorotron places a uniform charge on a photoreceptor for forming electrostatic latent images. Three conductive pin arrays are disposed in a housing defined by sidewalls and a screen adjacent the photoreceptor. There can be provided insulative walls between adjacent pin arrays. The screen and a surface of the housing can be curved to correspond to a curvature of the photoreceptor.

Abstract: An electrostatographic printing apparatus comprises a charge receptor, and a transfer station for transferring a toner image from the charge receptor to a sheet by providing an electric field of predetermined magnitude at a transfer zone. The transfer station includes a rotatable transfer member, with a cleaning corotron associated therewith. A control system for maintaining a constant current at the transfer zone takes into account a current supplied by the cleaning corotron. The control system can also take into account current leakages associated with the transfer member.

Abstract: Apparatus for charging a substrate, including: an elongated charging member having a crowned surface; an elongated pressure member having the pressure member being supported for pressure engagement with the charging member to form a nip therebetween adapted to receive the substrate. There is also disclosed a method for making the apparatus.

Abstract: Apparatus for charging a substrate, comprising: an elongated charging member having a crowned surface; an elongated pressure member having, the pressure member being supported for pressure engagement with the charging member to form a nip therebetween adapted to receive the substrate. There is also disclose a method for making the apparatus.

Abstract: Apparatus for charging a substrate, comprising: an elongated charging member having a crowned surface; an elongated pressure member having, the pressure member being supported for pressure engagement with the charging member to form a nip therebetween adapted to receive the substrate. There is also disclose a method for making the apparatus.

Abstract: The present invention relates to improved methods of coating donor members with waterbome coatings, wherein a resin, a pigment, and water are combined in proportions effective to provide a donor member precursor composition; the donor member precursor composition is subjected to high pressure communition to provide a donor member conductive coating composition; and the donor member coating composition is coated onto a substrate. The present method advantageously provides a donor member coating which is substantially free of air pockets or defects. In preferred embodiments the resin is a phenolic resin, preferably a waterborne phenolic resin, such as a phenol-formaldehyde resole, and in other preferred embodiments the pigment is selected from the group consisting of carbon black, graphite, magnetite, nigrosine, and combinations thereof.

Abstract: A waterborne coating composition for application to a donor member surface includes a resin binder, a conductive particle material, an additional particle material of either (1) graphite particles with a dispersant of polyacrylamide, polyethylene oxide, polyvinyl alcohol or mixtures thereof or (2) crosslinked polymer particles, and water. The waterborne coating composition exhibits superior stability and achieves suitable properties when coated upon a donor member surface, thereby permitting practical replacement of volatile organic components typically used in donor member coating compositions.

Abstract: A method for making a developer roll sleeve in which a core substrate roll is spray coated with a conductive composition including a host resin composition and a wear-resistance imparting additive. Preferably, the host resin composition includes a phenolic thermosetting resin and a conductivity additive such as a carbon black, graphite and the like. Further, the wear resistance imparting additive is preferably selected from the group consisting of a polytetrafluoroethylene resin (e.g., Teflon), graphite, ultra-high molecular weight polyethylene having a molecular weight from about 3,000 to about 4,500 grams, molybedenum disulfide, silicone and mixtures thereof. The wear resistance imparting additive is preferably provided in an amount sufficient to obtain a thickness wear rate of less than about 0.00047 percent per printing cycle.

Abstract: A developer roll sleeve and method for making the same is disclosed. In a preferred embodiment, a core substrate roll is spray coated with a conductive composition comprising a host resin composition and a wear-resistance imparting additive. Preferably, the host resin composition comprises a phenolic thermosetting resin and a conductivity additive such as carbon black, graphite and the like. Further, the wear resistance imparting additive is preferably selected from the group consisting of a polytetrafluoroethylene resin (e.g., Teflon), graphite, ultra-high molecular weight polyethylene having a molecular weight from about 3,000 to about 4,500 grams, molybdenum, molybdenum disulfide, silicone and mixtures thereof. The wear resistance imparting additive is preferably provided in an amount sufficient to obtain a thickness wear rate of less than about 0.00047 percent per printing cycle.

Abstract: A developer roll sleeve and method for making the same is disclosed. In a preferred embodiment, a core substrate roll is spray coated with a conductive composition including a host resin composition and a wear-resistance imparting additive. Preferably, the host resin composition includes a phenolic thermosetting resin and a conductivity additive such as carbon black, graphite and the like. Further, the wear resistance imparting additive is preferably selected from the group consisting of a polytetrafluoroethylene resin (e.g., Teflon), graphite, ultra-high molecular weight polyethylene having a molecular weight from about 3,000 to about 4,500 grams, molybdenum, molybdenum disulfide, silicone and mixtures thereof. The wear resistance imparting additive is preferably provided in an amount sufficient to obtain a thickness wear rate of less than about 0.00047 percent per printing cycle.

Abstract: An apparatus which cleans particles from a tracking region on a photoconductive drum. A spacer maintains the spacing between the photoconductive drum and a developer roller substantially constant. The spacer contacts the photoconductive drum in the tracking region. The cleaning member, mounted on a transfer roller, removes particles adhering to the tracking region so as to ensure that there is no build up of particles in the tracking region changing the spacing between the photoconductive drum and the developer roller.

Abstract: A member for use in an electrostatographic printing machine is adapted to transfer a charge from a charging source to a surface adapted to receive a latent image. The member is also adapted to clean at least one of marking particles and contamination from the surface.

Abstract: A charging roller for use in a machine in which an electrical bias is applied to a surface of a member is provided. The charging roller includes a shaft, a foam material surrounding at least a portion of the shaft, and a thermoplastic material. The thermoplastic material surrounds at least a portion of the foam material. The foam material is adapted to provide for greater compliance to prevent vibration of the roller against the surface.

Abstract: A seal for sealing a toner filling aperture of a housing of a refilled toner cartridge is provided. The cartridge includes a ruptured closure positioned on the housing adjacent the aperture. The housing and the closure cooperate to define a non-planar surface adjacent the periphery of the aperture. The seal includes a body having a first surface thereof conforming to the periphery of the aperture. The body has an opening therein. The seal also includes a member secured to a second surface of the body. The second surface is opposed to the first surface. The seal also includes an adhesive secured to the first surface of the body. The adhesive conforms to the non-planar surface and seals the body to the closure and the housing so as to permit the cartridge to be sealed without removal of the closure.