Patents Represented by Attorney J. E. Beck
  • Patent number: 5161010
    Abstract: An apparatus which determines the intensity of signals generated by a raster input scanner. The signals are inputted to a delay circuit and to a gray detector. The signals generated from the delay circuit and the gray detector are subsequently sent to a logic circuit which determines whether to output a gray signal or a non-gray signal to a raster output scanner used to expose a charged photoconductive surface to record a latent image thereon.
    Type: Grant
    Filed: October 11, 1990
    Date of Patent: November 3, 1992
    Assignee: Xerox Corporation
    Inventor: David Birnbaum
  • Patent number: 5153647
    Abstract: An apparatus which develops an electrostatic latent image recorded on a photoconductive member with toner particles. A donor member is spaced from the photoconductive member and transports toner particles to a development zone adjacent the photoconductive member. Electrode wires are positioned in the development zone between the photoconductive member and the donor member. The electrode wires are electrically biased to detach toner particles from the donor member to form a cloud of toner particles in the development zone. Toner particles detached from the toner particle cloud develop the latent image. The electrode wires are adjustably supported in tension adjacent the donor member.
    Type: Grant
    Filed: June 27, 1991
    Date of Patent: October 6, 1992
    Assignee: Xerox Corporation
    Inventors: Laurence S. Barker, Thomas J. Behe, Daniel M. Bray, James R. Davidson, Jeffrey J. Folkins, Gerald M. Kryk, Joseph G. Schram
  • Patent number: 5153648
    Abstract: An apparatus in which a donor roll advances toner to an electrostatic latent image recorded on a photoconductive member. A plurality of electrode wires are positioned in the space between the donor roll and the photoconductive member. A support contacts the electrode wires at at least two points. One of the contact points is selected to minimize the wire edge angle between with the other of the contact points being selected to minimize the wire free span. In this way, edge banding and strobing effects are minimized.
    Type: Grant
    Filed: March 2, 1992
    Date of Patent: October 6, 1992
    Assignee: Xerox Corporation
    Inventors: Gerald T. Lioy, Jeffrey J. Folkins, Thomas J. Behe
  • Patent number: 5144370
    Abstract: An apparatus in which a donor roll advances toner to an electrostatic latent image recorded on a photoconductive member. A plurality of electrode wires are positioned in the space between the donor roll and the photoconductive member. The electrode wires are tensioned. An electrical bias is applied to the electrode wires to detach the toner from the donor rolls so as to form a toner cloud in the space between the electrode wires and the photoconductive member. Detached toner from the toner cloud develops the latent image. Vibration of the electrode wires is detected in order to enable the vibration of the electrode wires to be substantially cancelled.
    Type: Grant
    Filed: October 31, 1991
    Date of Patent: September 1, 1992
    Assignee: Xerox Corporation
    Inventor: Jan Bares
  • Patent number: 5140368
    Abstract: A character printing and detection system in which a toner image is fixed to a sheet with each character of the toner image being inverted so that the normally leading edge of each character is the trailing edge. The toner image on the sheet is magnetized. The sheet of support material is re-inverted so that the leading edge of each character of the toner image fixed to the sheet of the support material is the trailing edge. The intensity of the magnetic field generated by each character of the toner image fixed to the sheet is detected to identify each character.
    Type: Grant
    Filed: July 16, 1990
    Date of Patent: August 18, 1992
    Assignee: Xerox Corporation
    Inventor: Thomas F. Szlucha
  • Patent number: 5132735
    Abstract: An apparatus which develops an electrostatic latent image recorded on a photoconductive member with toner. Fluidized toner is transported from one end of the developer housing to the other end. A donor roller, spaced from the photoconductive member is adapted to receive toner and transport the toner to a development zone adjacent the photoconductive member. The excess toner is contained and diverted from the ends of the donor roller into the chamber of the housing. This insures that excess toner does not build-up on the sides of the donor roller resulting in the sides of the copy being background free.
    Type: Grant
    Filed: June 27, 1991
    Date of Patent: July 21, 1992
    Assignee: Xerox Corporation
    Inventor: Leon A. Howland
  • Patent number: 5128723
    Abstract: An apparatus which develops an electrostatic latent image recorded on a photoconductive member with toner. Fluidized toner is transported from one end of the developer housing to the other end. An electrical bias is applied between the toner mover and the donor roller so as to attract toner to the donor roller. A rotating rod resiliently urged into contact with the donor roller charges and meters the toner on the donor roller. Electrically biased wires in the development zone between the photoconductive member and the donor roller detach toners from the donor roll so as to form a toner powder cloud in the development zone. Detached toner from the toner powder cloud develops the latent image.
    Type: Grant
    Filed: May 6, 1991
    Date of Patent: July 7, 1992
    Assignee: Xerox Corporation
    Inventors: Steven B. Bolte, Grace T. Brewington, Dan A. Hays, Raymond W. Stover, William H. Wayman
  • Patent number: 5124749
    Abstract: An apparatus in which a donor roll advances toner to an electrostatic latent image recorded on a photoconductive member. A plurality of electrode wires are positioned in the space between the donor roll and the photoconductive member. The electrode wires are electrically biased to detach the toner from the donor roll so as to form a toner cloud in the space between the electrode wires and photoconductive member. Detached toner from the toner cloud develops the latent image. A damping material is coated on a portion of the electrode wires. The damping material damps vibration of the electrode wires.
    Type: Grant
    Filed: September 13, 1991
    Date of Patent: June 23, 1992
    Assignee: Xerox Corporation
    Inventor: Jan Bares
  • Patent number: 5122839
    Abstract: A cleaning blade having a dual action cleaning blade. One side of the cleaning blade is coated with an abrasive material. The cleaning blade is used in an electrophotographic printing machine to remove residual particles from a photoconductive surface.
    Type: Grant
    Filed: April 22, 1991
    Date of Patent: June 16, 1992
    Assignee: Xerox Corporation
    Inventors: Robert P. Siegel, Bruce E. Thayer
  • Patent number: 5121171
    Abstract: A printing machine having a pair of photoconductive drums with a transfer roller interposed therebetween produces a full color document in two operating cycles. During the first operating cycle, a first color developed image is transferred from the first photoconductive drum to a sheet moving with the transfer roller. A second color developed image is transferred from the second photoconductive drum to the sheet in superimposed registration with the first developed image transferred thereto. During the second operating cycle, the foregoing process is repeated for a third color developed image and a fourth color developed image. In this way, a full color composite toner image is formed on the sheet.
    Type: Grant
    Filed: January 9, 1991
    Date of Patent: June 9, 1992
    Assignee: Xerox Corporation
    Inventor: John F. Knapp
  • Patent number: 5095338
    Abstract: A developer unit which develops an electrostatic latent image recorded on a photoconductive member used in an electrophotographic printing machine. The developer unit uses a developer material which ages during the life of the electrophotographic printing machine. Additional developer material having at least carrier granules and toner particles, is supplied to the developer material in the developer unit to extend the life of the developer material. Discharge of developer material from the developer unit is controlled by a permanent magnet and an electromagnet positioned adjacent an exit port in the developer unit. The permanent magnet generates a magnetic flux field in the region of the exit port to form a developer material curtain which prevents the passage of developer material from the exit port. When the electromagnet is energized, it generates a magnetic flux field which attracts developer material from the developer material curtain.
    Type: Grant
    Filed: February 21, 1991
    Date of Patent: March 10, 1992
    Assignee: Xerox Corporation
    Inventors: Thomas A. Hayes, Jr., Clem J. Nagley, Anthony L. Paolini
  • Patent number: 5089847
    Abstract: An electrophotographic printing machine in which a color highlighted original document having black indicia and non-black indicia thereon is reproduced in a single cycle. An optical system exposes the charged portion of the photoconductive member to record an optical electrostatic latent image corresponding to the black indicia of the original document. The optical electrostatic latent image is developed with black marking particles. Thereafter, the photoconductive member is recharged and a raster exposure system exposes the charged portion of the photoconductive member to record a raster electrostatic latent image corresponding to the non-black indicia of the original document. The raster electrostatic latent image is then developed with non-black marking particles. The black and non-black marking particles are transferred to a copy sheet and permanently fused thereto forming a highlight color copy of the original document.
    Type: Grant
    Filed: June 19, 1990
    Date of Patent: February 18, 1992
    Assignee: Xerox Corporation
    Inventor: Jeffrey J. Folkins
  • Patent number: 5083161
    Abstract: An infrared densitometer which measures the reflectivity of a selected region on a moving photoconductive belt covered at least partially with marking particles. Collimated light rays are projected onto the selected region of the moving photoconductive member with or without marking particles thereon. The light rays reflected from the selected region of the moving photoconductive member are collected and directed onto a photodiode array. A photodiode array generates electrical signals proportional to the diffuse component of the total reflectivity of the selected region of the photoconductive member with and without marking particles thereon. Circuitry determines a control signal as a function of the difference in electrical signals.
    Type: Grant
    Filed: August 25, 1989
    Date of Patent: January 21, 1992
    Assignee: Xerox Corporation
    Inventors: Michael D. Borton, Fred F. Hubble, III, James P. Martin, Theresa K. Mattioli, Ralph A. Shoemaker
  • Patent number: 5083164
    Abstract: An apparatus in which successive developer units are moved to a development zone to develop, with different color toner, successive latent images recorded on a photoconductive member. At least four developer units move in unison with one another to index successive developer units into the development zone. The developer units translate horizontally to develop successive latent images. The first developer unit, third developer, fourth developer unit and second developer unit are indexed sequentially into the development zone to develop the first, second, third, and fourth latent images, respectively.
    Type: Grant
    Filed: March 11, 1991
    Date of Patent: January 21, 1992
    Assignee: Xerox Corporation
    Inventors: Venkatesh H. Kamath, Lam F. Wong
  • Patent number: 5081507
    Abstract: An apparatus in which a sheet is advanced into registration with different color information developed on master sheets secured releasably on different drums. Each master sheet is secured to a gripper bar having outwardly extending pins. The pins in the master sheet gripper bars mount in holes in the drum and extend outwardly therefrom. A chain driven gripper bar advances the sheet into registration with successive master sheets. The sheet gripper bar is mounted pivotably and slidably on the chain. The sheet gripper bar has notches in the leading edge thereof to mesh with the pins extending from the master sheet gripper bar. This detachably couples the sheet and the master sheet to move in unison with one another. In this way, the sheet is placed in registration with the different color information developed on each master sheet.
    Type: Grant
    Filed: November 16, 1987
    Date of Patent: January 14, 1992
    Assignee: Xerox Corporation
    Inventors: Edwin R. Monkelbaan, Joseph Fantuzzo, Thomas Robson, Herbert H. Ammenheuser
  • Patent number: 5081498
    Abstract: A developer unit which stores a supply of developer material has a capacitance cell positioned therein contacting the developer material. The capacitance cell measures the change in capacitance of the developer material and generates a signal indicative thereof. The capacitance change is caused by a change in the dielectric characteristics of the developer material due to changes in the moisture content thereof. This signal, in combination with a signal indicating the concentration of toner particles in the developer material, is used to control various processing stations in the printing machine employing the developer unit.
    Type: Grant
    Filed: January 10, 1991
    Date of Patent: January 14, 1992
    Assignee: Xerox Corporation
    Inventor: Jan Bares
  • Patent number: 5081506
    Abstract: An apparatus in which successive toner images are transferred from a photoconductive drum to a sheet at a transfer zone. The sheet is transported by a perforated belt entrained about a stationary sleeve through a recirculating path. The sleeve has a plurality of spaced ports extending in and through the periphery thereof and connected to a vacuum source. In this way, the sheet is vacuum tacked to the belt to move in unison therewith in synchronism with the photoconductive drum. At the transfer zone, the sheet separates the belt and is interposed between the photoconductive member and a corona generator. The corona generator applies an electrostatic charge to the sheet to attract successive toner images thereto. The sheet moves with the belt in a recirculating path so that successive different color toner images are transferred thereto in registration with one another.
    Type: Grant
    Filed: March 19, 1990
    Date of Patent: January 14, 1992
    Assignee: Xerox Corporation
    Inventor: Stephen Borostyan
  • Patent number: 5078263
    Abstract: A web-steering mechanism, particularly for the endless belt of a xerographic copier, uses two rolls to hold the belt under tension. An idler roll is designed to rotate about an axis which is at a small angle to a tilt axis of the idler roll assembly. Small tilting movements of the idler roll assembly, under the control of a servo-motor are effective to alter the angle at which the web enters and/or leaves the roll, to cause the web to walk along the tilted roll.
    Type: Grant
    Filed: June 15, 1988
    Date of Patent: January 7, 1992
    Assignee: Xerox Corporation
    Inventors: Philip R. Thompson, Michael G. Ladell
  • Patent number: 5078086
    Abstract: An apparatus in which a latent image is developed with magnetic developer material. A rotating applicator roll transports the developer material. A magnet is mounted rotatably interiorly of the applicator roll and generates a magnetic flux field which attracts the developer material to a portion of the surface of the applicator roll. The magnet rotates under the influence of the magnetic flux field force applied thereon. When the apparatus is developing the latent image, the magnet is prevented from rotating in a first position wherein the magnetic flux field attracts the developer material to the portion of the applicator roll adjacent the latent image. Conversely, when the apparatus is not developing the latent image, the magnet is prevented from rotating in a second position wherein the magnetic flux field attracts the developer material to the portion of the applicator roll spaced from the latent image.
    Type: Grant
    Filed: May 20, 1988
    Date of Patent: January 7, 1992
    Assignee: Xerox Corporation
    Inventors: John J. Kopko, Joseph A. Seyfried
  • Patent number: RE33843
    Abstract: An apparatus in which a sheet is registered during the movement thereof. The sheet is moved along a path in a forward direction of movement and a lateral direction of movement substantially normal thereto. The lateral movement of the sheet causes the side edge of the sheet to engage a registration edge so as to be aligned thereat. The magnitude of the moving force applied on the sheet is proportional to the thickness of the sheet. In this way, the moving force varies as a function of the thickness of the sheet with the sheet slipping laterally when engaging the registration edge to prevent buckling thereof.
    Type: Grant
    Filed: March 20, 1989
    Date of Patent: March 10, 1992
    Assignee: Xerox Corporation
    Inventors: Raymond A. Naramore, Anthony Ilacqua