Patents Assigned to Xerox
  • Patent number: 5539434
    Abstract: An ink jet recording apparatus having a plurality of recording head units, a test printing operation is carried out to detect the amounts of shift in position of the resultant records, and the amounts of shift thus detected is utilized for determining the maximum number of nozzles to be used and the positions of them for each recording head unit. The number of nozzles to be used is compared with a minimum unit of sheet feed, and determined so that the number of nozzles and the minimum unit are most suitably compatible with each other. In a printing operation, the use of nozzles is controlled, and the amount of feed of the recording sheet is set to the print width which corresponds to the number of nozzles to be used.
    Type: Grant
    Filed: May 4, 1993
    Date of Patent: July 23, 1996
    Assignee: Fuji Xerox Co., Ltd.
    Inventor: Takeshi Fuse
  • Patent number: 5538829
    Abstract: A negatively charged toner composition comprised of a polymer resin or polymer resins, colorants comprised of pigment particles and/or dyes, optional surface additives, and a boron charge enhancing additive obtained from the reaction of an alkylboric acid or an arylboric acid and an N-alkyl- or N-aryl-substituted bis(hydroxyalkyl)amine, or a zinc charge enhancing additive obtained from the reaction of an aromatic carboxylic acid and an N-alkyl- or N-aryl-substituted bis(hydroxyalkyl)amine with a zinc ion-containing compound in aqueous medium.
    Type: Grant
    Filed: September 5, 1995
    Date of Patent: July 23, 1996
    Assignee: Xerox Corporation
    Inventors: Beng S. Ong, H. Bruce Goodbrand
  • Patent number: 5539437
    Abstract: A hybrid ink jet print head has at least one ink channel with an open end that serves as a nozzle. A first reservoir holds a hot melt ink and a first inlet allows the hot melt ink to flow from the first reservoir into the ink channel. A heater plate heats the hot melt ink held in the at least one ink channel. A second reservoir holds a thermal liquid and a second inlet allows the thermal liquid to flow into the ink channel. The second inlet is spaced further from the nozzle than is the first inlet. A heating element is positioned in the ink channel between the first and second inlets. An interconnect is secured at one end to the heating element. Selective application of current pulses along the interconnect to the heating element vaporizes the thermal liquid and forms a bubble in the ink channel. The bubble then acts on the hot melt ink in the ink channel to eject hot melt ink droplets at the nozzle.
    Type: Grant
    Filed: January 10, 1994
    Date of Patent: July 23, 1996
    Assignee: Xerox Corporation
    Inventor: Richard C. Penwell
  • Patent number: 5539441
    Abstract: In an overfilled polygon ROS architecture, fast scan jitter is reduced by uniformly illuminating the overfilled facets. In one embodiment, the collimator lens is designed with a long focal length to transmit only the more uniform central portion of the Gaussian shaped intensity profile output of a laser diode. In another embodiment, the light level at the polygon facet is made uniform by introducing a variable transmission filter along the optical path.
    Type: Grant
    Filed: November 9, 1993
    Date of Patent: July 23, 1996
    Assignee: Xerox Corporation
    Inventors: James J. Appel, Susan E. Dunn
  • Patent number: 5539468
    Abstract: An image signal is divided into pixel blocks, each of which is subjected to orthogonal transform to be converted to transform coefficients. The transform coefficients are divided by respective thresholds set as a quantization matrix to become quantized coefficients. Coding symbols are constructed from the quantized coefficients using a coding symbol table which includes additional coding symbols corresponding to adaptive coding operations. The coding symbols are entropy-coded to become coded information. One of the adaptive coding operations is effected in accordance with identification information that is produced in accordance with a statistical parameter of the pixel blocks. The transform and quantizing operations are stopped during a block run, and after the end of the block run a coding symbol corresponding to the block-run detection is coded.
    Type: Grant
    Filed: January 10, 1995
    Date of Patent: July 23, 1996
    Assignee: Fuji Xerox Co., Ltd.
    Inventors: Kazuhiro Suzuki, Ken Umezawa, Koh Kamizawa
  • Patent number: 5539505
    Abstract: A non-interactive or scavengeless development system for use in color imaging is disclosed. A donor roll structure is provided with two sets of interdigitated electrodes which are embedded in the surface of the donor roll. To minimize wear and tear on the electrodes of one set of the interdigitated wire electrodes which are selectively actuated in a development zone, power is commutated thereto via a member that makes rolling contact with the electrodes only in the development zone. In two embodiments of the invention, the contact is made with the electrodes at the outer surface of the donor roll while in another embodiment contact is made on the interior surface of the donor roll structure.
    Type: Grant
    Filed: November 23, 1993
    Date of Patent: July 23, 1996
    Assignee: Xerox Corporation
    Inventor: Delmer G. Parker
  • Patent number: 5539501
    Abstract: Corona generating devices, and printing machines which use such devices, which include a shell, a plurality of corona wires within the shell, and a power source which outputs first and second alternating voltages which are out-of-phase with each other. The plurality of corona wires are interconnected so as to form two groups of wires. The wires in the first group are operatively connected to the first alternating voltage and the wires in the second group are operatively connected to the second alternating voltage. The corona wires are located within the shell such that wires of the first group are adjacent wires of the second group, and such that wires of the second group are adjacent wires of the first group. The corona generating device beneficially includes a metallic screen which acts as a grid and which controls the corona flow from the corona generating device.
    Type: Grant
    Filed: July 20, 1995
    Date of Patent: July 23, 1996
    Assignee: Xerox Corporation
    Inventors: Zhao-Zhi Yu, James R. Beachner
  • Patent number: 5539506
    Abstract: An apparatus for removing the edge raggedness and background toner level of, for example, tri-level images by reestablishing the images and cleaning fields of the first developed image with a closely spaced electrode. The toner is redistributed by electrical and/or mechanical forces which leads to the removal of edge raggedness and background toner before transfer of the tri-level images to a copy sheet.
    Type: Grant
    Filed: October 31, 1994
    Date of Patent: July 23, 1996
    Assignee: Xerox Corporation
    Inventors: Lloyd F. Bean, Victor Berko-Boateng
  • Patent number: 5539841
    Abstract: A method for comparing two image sections consisting of a plurality of image signals, or pixels, where each image section represents a token (e.g., character, symbol, glyph, string of components, or similar units of semantic understanding), in order to identify when similar tokens are present within the image sections. The invention further operates without the need for individually detecting and/or identifying the components making up the tokens. In one embodiment, the method relies upon the detection of connected components within words to first isolate individual word tokens and then applies a two stage process where dilated images of the tokens are compared with model representations of the tokens to determine the relative similarity therebetween.
    Type: Grant
    Filed: April 27, 1995
    Date of Patent: July 23, 1996
    Assignee: Xerox Corporation
    Inventors: Daniel P. Huttenlocher, Eric W. Jaquith
  • Patent number: 5539511
    Abstract: A sheet decurler such as may be used to decurl liquid or solid toned printed or copied sheets. The decurler has an extended multidirectional nip having first and second decurling members for removing multiple curl conditions from a sheet.
    Type: Grant
    Filed: December 16, 1994
    Date of Patent: July 23, 1996
    Assignee: Xerox Corporation
    Inventors: Stephen J. Wenthe, Jr., Ashok T. Patel, Arthur J. Sobon, Bruce J. DiRenzo, Kenneth E. Giunta, David G. Kolbe, Thomas R. Alexander, Carlos A. Velazquez
  • Patent number: 5539205
    Abstract: An element in a corona generating device having at least one conductive corona discharge electrode for depositing negative charge on an imaging surface in an electrostatographic imaging apparatus, the element being capable of adsorbing nitrogen oxide species generated when said corona generating device is energized and capable of desorbing nitrogen oxide species when the corona generating device is not energized, the element having an adhesion, promoting surface reclaimed from prior use in a similar capacity by immersion in an alkaline ultrasonic bath where the cavitation action of the bath is sufficient to remove any binder thereon and any metal, metallic compound and other solid particles as solid particles without metallic dissolution in the alkaline bath while at the same time providing a random microetched surface roughness to promote the subsequent coating and adherence of a substantially continuous thin conductive dry film of aluminum hydroxide containing graphite and powdered nickel, the reclaimed ele
    Type: Grant
    Filed: January 30, 1995
    Date of Patent: July 23, 1996
    Assignee: Xerox Corporation
    Inventor: Louis Reale
  • Patent number: 5539458
    Abstract: A number of photodiodes are arranged in line and dark output generating diodes are associated with the respective photodiodes. The light incident side of each dark output generating diode is shielded by a metal film. Two thin-film transistors are respectively connected to the photodiode and the dark output generating diode to transfer charges generated in the respective diodes. A capacitor is connected between the sources of the two thin-film transistors, and stores charges corresponding to the difference between the charges transferred through the two thin-film transistors, i.e., charges generated in the photodiode in response to incident light. Alternatively, the charges transferred through the two thin-film transistors are respectively stored in first and second capacitors, and charges corresponding to the difference between the charges of the first and second capacitors are obtained by a differential amplifier and stored in a third capacitor.
    Type: Grant
    Filed: September 8, 1995
    Date of Patent: July 23, 1996
    Assignee: Fuji Xerox Co., Ltd.
    Inventor: Norikazu Yamada
  • Patent number: 5536615
    Abstract: A process for the preparation of liquid developers comprising:(i) preparing a pigment dispersion, which dispersion is comprised of a pigment, and an ionic surfactant;(ii) shearing said pigment dispersion with a latex or emulsion blend comprised of a nonionic surfactant, resin, and a counterionic surfactant with a charge polarity of opposite sign to that of said ionic surfactant and optionally adding further anionic, or nonionic surfactant to stabilize the aggregates obtained in (iii);(iii) heating the above resulting sheared aqueous blend below about the glass transition temperature (Tg) of the resin to form toner size aggregates with a narrow particle size distribution;(iv) heating said bound aggregates above about the Tg of the resin to form toner size particles in an aqueous medium and which particles possess a narrow particle size distribution; and(v) separating from the aqueous medium toner particles of resin and pigment, and dispersing said toner particles in a carrier fluid.
    Type: Grant
    Filed: July 5, 1995
    Date of Patent: July 16, 1996
    Assignee: Xerox Corporation
    Inventors: Michael A. Hopper, Raj D. Patel, Grazyna E. Kmiecik-Lawrynowicz, Peter G. Odell, Bernard Grushkin, George A. Gibson
  • Patent number: 5537189
    Abstract: There is disclosed an electrostatographic printing apparatus having (a) a detachable imaging module including a housing and a photosensitive member, wherein the photosensitive member is partially enclosed within the housing, and wherein the photosensitive member has an outer surface which includes an electrically conductive portion; (b) an electrically grounded component free of attachment to the module; and (c) an electrically conductive part, free of attachment to the module, in contact with both the grounded component and the conductive portion on the outer surface of the photosensitive member, thereby establishing grounding of the photosensitive member, and wherein upon removal of the imaging module the part remains in contact with the grounded component and upon insertion of a new detachable imaging module which has a new photosensitive member having an outer surface that includes an electrically conductive portion, the part contacts the electrically conductive portion on the outer surface of the new pho
    Type: Grant
    Filed: July 3, 1995
    Date of Patent: July 16, 1996
    Assignee: Xerox Corporation
    Inventor: Edward P. Imes
  • Patent number: 5537491
    Abstract: To group items in an array, gap data are obtained indicating gaps between items. The gap data are used to obtain threshold data, which are then used to obtain grouping data. The gaps could, for example, be distances between items in a two-dimensional array or differences between values at which items occur in a one-dimensional array. The threshold data indicate a threshold. The threshold would produce a number of groups of the items that is stable across a range of thresholds, and the range of thresholds meets a criterion for largeness of a range. The criterion can require, for example, that the range be larger than the stable range of thresholds of any other number in a set of numbers of groups. The threshold can be obtained iteratively by applying a candidate threshold for each iteration. The candidate thresholds can be incremented, and the iterations can be counted to find a number of groups meeting the criterion.
    Type: Grant
    Filed: November 24, 1993
    Date of Patent: July 16, 1996
    Assignee: Xerox Corporation
    Inventors: James V. Mahoney, Satyajit Rao
  • Patent number: 5536613
    Abstract: A process for the preparation of pigmented toner compositions comprising: a) forming at a first temperature, a first melt mixture comprised of a partially crosslinked thermoplastic resin, pigment, optionally a wax, and optional additives, wherein the partially crosslinked thermoplastic resin is comprised of a mixture of crosslinked resin macrogel particles, crosslinked resin microgel particles, and uncrosslinked resin; and b) melt mixing at a second temperature, the first melt mixture to form a second mixture, wherein the macrogel particles are partially converted into microgel particles, and wherein the second temperature is less than or equal to the first temperature.
    Type: Grant
    Filed: February 23, 1995
    Date of Patent: July 16, 1996
    Assignee: Xerox Corporation
    Inventors: Hui Chang, Joo T. Chung, Joseph L. Leonardo, Enno E. Agur, John J. Ianni, Allison G. Thomas, Linda A. Flannery
  • Patent number: 5537222
    Abstract: A image edit apparatus in which area data of 16-bit width have been stored at the memory locations of the corresponding addresses of the respective memory planes of a plane memory 403. The operation of reading area data therefrom by a pseudo sync signal starts before a line sync signal becomes active. A density-conversion/area generating circuit 405 converts the data format from the plane type to the pixel type, so that area commands are generated. Then, the circuit 405 reads an edit command out of a logic RAM, using the area command as address, and outputs the command. By reading the area data earlier and processing that data, a delay in the density-conversion/area generating circuit can be absorbed, so that the output edit command is synchronized with the image data.
    Type: Grant
    Filed: May 8, 1992
    Date of Patent: July 16, 1996
    Assignee: Fuji Xerox Co., Ltd.
    Inventors: Yasuhiko Iwamoto, Kazuman Taniuchi, Hiroshi Sekine, Yoshio Ichiyanagi, Sadao Furuoya
  • Patent number: 5537518
    Abstract: A document processing system comprises a document data forming means for forming document data adapted to be printed on printing sheets having a first predetermined size, printing sheet selecting means, connected to the document data forming means, for selecting second printing sheets having a second predetermined size, the second predetermined size being larger than the first predetermined size by a specified area, and additional data forming means for forming additional data adapted to be printed in the specified area.
    Type: Grant
    Filed: May 26, 1995
    Date of Patent: July 16, 1996
    Assignee: Fuji Xerox Co., Ltd.
    Inventor: Akihiro Hasegawa
  • Patent number: 5537223
    Abstract: A printing system for receiving grayscale input image data and rendering halftoned image data having embedded data on a recording medium includes an addressable three dimensional memory system. The memory system has a first set of address lines defining an x dimension, a second set of address lines defining a y dimension, and a third set of address lines providing an intensity dimension, and halftoning circuitry for receiving and transforming grayscale input image data into multi-bit value output data. A look-up table is used to match multi-bit value output data representing x dimension, y dimension, and intensity, to grayscale input image data. The system uses addressing circuitry for addressing the three dimensional memory system, with the first set of address lines and the second set of address lines defining a screen stored in the memory system, the first set of address lines and the second set of address lines providing x and y address values defined at a desired screen angle.
    Type: Grant
    Filed: June 2, 1994
    Date of Patent: July 16, 1996
    Assignee: Xerox Corporation
    Inventor: Douglas N. Curry
  • Patent number: 5537522
    Abstract: A document processing device automatically changes chart designs in inputted documents. The processing device receives simple indications showing the user's intentions, improves the quality of designs in accordance with input indications and outputs the improved design. A document image inputting module receives the current document. A chart extracting module then extracts areas of charts included in the inputted document. A chart area dividing module receives output from the extracting module and divides the extracted chart area into elements such as character, line and graphic areas. An element attribute providing module receives the divided elements and determines the positional relations of the elements with respect to the whole chart. An output image forming module receives information from both the chart area dividing module and the element attribute providing module. The output image is formed by coloring image data corresponding to each element.
    Type: Grant
    Filed: January 24, 1995
    Date of Patent: July 16, 1996
    Assignee: Fuji Xerox Co., Ltd.
    Inventors: Kazuo Shibuta, Tsuyoshi Tanaka