Patents Represented by Attorney, Agent or Law Firm Richard A. Tomlin
  • Print wheel mounting means
    Patent number: 4556335
    Abstract: A print wheel mounting means. The print wheel has pivot posts formed integrally thereon. The pivot posts are spring-locked into channels in a connector attached to the print wheel drive shaft. The connector thus positions the print wheel to be pivoted onto the print wheel drive shaft.
    Type: Grant
    Filed: May 14, 1984
    Date of Patent: December 3, 1985
    Assignee: Xerox Corporation
    Inventor: Lyle E. Morris
  • Ohmic contacts for hydrogenated amorphous silicon
    Patent number: 4529619
    Abstract: A method of forming an ohmic contact between an amorphous silicon hydride semiconductor and a substrate which includes coating a film of palladium on the substrate and overcoating the palladium with a thin film of amorphous silicon hydride forming a thin palladium silicide layer. The amorphous silicon hydride is dehydrogenated by annealing forming a highly defective amorphous silicon layer and a thicker palladium silicide layer through which carriers can readily tunnel. The amorphous silicon hydride semiconductor is then coated over the amorphous silicon layer to the desired thickness.
    Type: Grant
    Filed: July 16, 1984
    Date of Patent: July 16, 1985
    Assignee: Xerox Corporation
    Inventors: Robert J. Nemanich, Malcolm J. Thompson
  • Programmable driver/controller for ink jet printheads
    Patent number: 4521786
    Abstract: A drive circuit for a drop-on-demand ink jet ejector. Both drive pulse amplitude and drive pulse width are programmably controlled by utilizing simple digital circuitry.
    Type: Grant
    Filed: September 20, 1982
    Date of Patent: June 4, 1985
    Assignee: Xerox Corporation
    Inventor: Lee L. Bain
  • Electromechanical transducer protecting
    Patent number: 4511598
    Abstract: An electromechanical transducer for an ink jet printer is vacuum impregnated with, e.g., epoxy or silicone materials. The impregnated transducer is less subject to chemical attack and to being shorted out by penetration by conductive inks.
    Type: Grant
    Filed: October 4, 1982
    Date of Patent: April 16, 1985
    Assignee: Xerox Corporation
    Inventor: Linda T. Creagh
  • Ink jet printing using horizontal interlacing
    Patent number: 4509058
    Abstract: Horizontal interlacing is used in an oscillating bar drop-on-demand ink jet printer to improve image quality, particularly in solid black areas. The disclosed system provides a method for printing that allows the image-receiving surface to be forwarded continuously, reducing the requirement for stepwise operation.
    Type: Grant
    Filed: September 22, 1983
    Date of Patent: April 2, 1985
    Assignee: Xerox Corporation
    Inventor: Kenneth H. Fischbeck
  • Automatic calibration of drop-on-demand ink jet ejector
    Patent number: 4509057
    Abstract: A method of calibrating a scanning carriage drop-on-demand ink jet ejector wherein the ejector is traversed past a droplet detection light beam while droplets are ejected. By knowing the position of the ejector and relating it to the amount of light blocked by droplets, horizontal errors in drop position can be detected. Similarly, by measuring the amount of time elapsing between droplet ejection and droplet detection, the velocity of the droplets can be determined. Corrections can be made by adjusting the time of ejection and/or the drive pulse amplitude and/or width.
    Type: Grant
    Filed: March 28, 1983
    Date of Patent: April 2, 1985
    Assignee: Xerox Corporation
    Inventors: Gordon Sohl, Donald L. Ort, John R. Leicht
  • Print wheel mounting
    Patent number: 4507001
    Abstract: An impact printer of the type wherein a print wheel is rotated to a print position by a motor, and printing is caused by impacting a particular character on the print wheel by a print hammer. The present impact printer has the print wheel drive means and the print hammer mechanism located on opposite faces of the print wheel, which greatly facilitates removal and insertion of print wheels in the printer.
    Type: Grant
    Filed: November 3, 1980
    Date of Patent: March 26, 1985
    Assignee: Xerox Corporation
    Inventor: Egon S. Babler
  • P-Glass reflow technique
    Patent number: 4496608
    Abstract: P-glass is heated to reflowing temperature by the radiant heating of a material overlying the P-glass layer. The coating layer is chosen such that its reflectivity increases at its melting temperature, and that temperature corresponds to the P-glass reflow temperature. Increased radiant heating will not increase the energy absorbed by the coating because more of the radiation is reflected. The temperature of the coating is thus limited providing controlled conductive heating of the P-glass layer.
    Type: Grant
    Filed: March 2, 1984
    Date of Patent: January 29, 1985
    Assignee: Xerox Corporation
    Inventors: David K. Biegelsen, Eric R. Sirkin
  • Ink jet ejector utilizing check valves to prevent air ingestion
    Patent number: 4496960
    Abstract: A pressure pulse drop ejector which incorporates a check valve at both ends of a tubular electromechanical transducer. The transducer is used both to radially squeeze ink through a check valve to an orifice and then by elongating, expressing a droplet from the orifice. The check valves provide the means necessary for preventing air ingestion into the drop ejector.
    Type: Grant
    Filed: September 20, 1982
    Date of Patent: January 29, 1985
    Assignee: Xerox Corporation
    Inventor: Kenneth H. Fischbeck
  • Electrodeposition method for check valve
    Patent number: 4487662
    Abstract: A check valve for a drop-on-demand pressure pulse ejector for preventing pressure pulse loss to the liquid supply system. The check valve is made by electrodeposition onto the surface of a substrate.
    Type: Grant
    Filed: September 20, 1982
    Date of Patent: December 11, 1984
    Assignee: Xerox Corporation
    Inventor: Kenneth H. Fischbeck
  • Tractor feed assembly tensioning bar
    Patent number: 4484702
    Abstract: A tractor feed assembly for an automatic printer. A manually operated tension bar is provided between the tractor feeder and the printer platen. The bar is locked in place by a spring that biases a knob attached to the bar into locking contact with a member formed on or attached to the tractor feed frame.
    Type: Grant
    Filed: March 25, 1983
    Date of Patent: November 27, 1984
    Assignee: Xerox Corporation
    Inventors: Charles J. Sabonis, Anthony W. Clark
  • Drive circuit for a drop-on-demand ink jet printer
    Patent number: 4459599
    Abstract: A drive circuit for a drop-on-demand ink jet printer utilizes the inherent capacitance of the driver electromechanical transducer to store at least a portion of the voltage required for droplet ejection. The drive circuit includes circuitry for sensing and terminating, for example, rapid discharge of the electrical potential difference across the electromechanical transducer during jet firing.
    Type: Grant
    Filed: July 29, 1982
    Date of Patent: July 10, 1984
    Assignee: Xerox Corporation
    Inventor: Donald L. Ort
  • Ink jet printer array
    Patent number: 4446469
    Abstract: A pulsed liquid droplet ejecting apparatus array wherein rectangular piezoelectric transducers are arranged abaxially over ink containing chambers. An edge of each transducer is fixed against a reaction block so that on excitation of the transducers by electrical pulses, the transducers extend into the ink chamber ejecting a drop. An improved method for rigidly mounting the piezoelectric transducers to the reaction block for improved efficiency is disclosed. Further, the design includes an improved mechanical crosstalk reducing member comprising a rigid member containing a void.
    Type: Grant
    Filed: March 31, 1982
    Date of Patent: May 1, 1984
    Assignee: Xerox Corporation
    Inventor: Theodore P. Perna
  • Print wheel for use with an alignment print hammer
    Patent number: 4425045
    Abstract: A print wheel for use in a serial printing system wherein print heads are provided with alignment surfaces corresponding to alignment surfaces on the print hammer. A beam retarder is utilized to assure that the alignment surfaces are firmly mated.
    Type: Grant
    Filed: August 1, 1979
    Date of Patent: January 10, 1984
    Assignee: Xerox Corporation
    Inventor: Richard G. Crystal
  • Ink jet array
    Patent number: 4414553
    Abstract: A pulsed liquid droplet ejecting apparatus array wherein rectangular piezoelectric transducers are arranged abaxially over ink-containing chambers. An edge of each transducer is fixed in a rigid casing so that on excitation of the transducers, the transducers extend into the ink chamber ejecting a droplet. The array is made by first producing completed individual jets and then assembling the completed jets into an array. The jets are designed to reduce mechanical crosstalk and to efficiently utilize the drive pulse.
    Type: Grant
    Filed: March 31, 1982
    Date of Patent: November 8, 1983
    Assignee: Xerox Corporation
    Inventor: Theodore P. Perna
  • Configurational reduction of pulse ejector crosstalk
    Patent number: 4395720
    Abstract: A method of minimizing crosstalk between transducer driven pulse liquid droplet ejectors in ejector arrays. An array mounted on a scanning carriage and having nozzles inclined to the direction of relative motion between the carriage and the print-receiving member is designed such that adjacent nozzles are not fired simultaneously. Similarly, an oscillating bar pulse ejector array is designed such that adjacent nozzles are not fired simultaneously.
    Type: Grant
    Filed: September 29, 1981
    Date of Patent: July 26, 1983
    Assignee: Xerox Corporation
    Inventors: Joel W. Grover, Kenneth H. Fischbeck
  • Bidirectional ink jet printing
    Patent number: 4389652
    Abstract: The invention relates to an oscillating bar drop-on demand ink jet printer where printing occurs while the bar is moving bidirectionally over a transversely moving record-receiving surface. Specifically, the invention relates to a method of increasing the effective print speed of such a printer by electrostatically compensating for the inherent velocity variation of the oscillating bar as it oscillates.
    Type: Grant
    Filed: September 22, 1981
    Date of Patent: June 21, 1983
    Assignee: Xerox Corporation
    Inventor: Kenneth H. Fischbeck
  • Ink jet array
    Patent number: 4389658
    Abstract: A pulsed liquid droplet ejecting apparatus array wherein rectangular piezoelectric transducers are arranged abaxially over ink-containing chambers. An edge of each transducer is fixed against a reaction block so that on excitation of the transducers, the transducers extend into the ink chamber ejecting a droplet. The ink chamber is formed in a relatively rigid material to increase the efficiency of utilization of the drive pulse.
    Type: Grant
    Filed: March 31, 1982
    Date of Patent: June 21, 1983
    Assignee: Xerox Corporation
    Inventors: Theodore P. Perna, Curt R. Raschke, William L. Baker, Jr.
  • Facsimile transceiver or similar article
    Patent number: D272246
    Type: Grant
    Filed: September 21, 1981
    Date of Patent: January 17, 1984
    Assignee: Xerox Corporation
    Inventor: Claude H. Hutcheson
  • Electronic typewriter
    Patent number: D277870
    Type: Grant
    Filed: September 29, 1982
    Date of Patent: March 5, 1985
    Assignee: Xerox Corporation
    Inventor: Wayne C. Cathey