Joseph L Stephany

US Patent:

7422301, Sep 9, 2008

Filed:

Jan 10, 2005

Appl. No.:

11/033369

Inventors:

Gary A. Kneezel - Webster NY, US
Thomas P. Courtney - Canandaigua NY, US
Joseph F. Stephany - Williamson NY, US
Richard V. LaDonna - Fairport NY, US
Juan J. Becerra - Altamont NY, US

Assignee:

Xerox Corporation - Norwalk CT

International Classification:

B41J 2/205
B41J 29/393

US Classification:

347 15, 347 19

Abstract:

A method and apparatus for reducing intercolor bleed using pixel spot size control to improve print quality is provided. The method includes printing pixels having a first spot size in an image region having a boundary between a first color portion and a second color portion of the image by ejecting first sized ink drops from the printhead nozzles, and printing border pixels having spot sizes smaller than the first spot size in the image region by ejecting smaller ink drops from the printhead nozzles, wherein the smaller ink drops are smaller than the first sized ink drops. A printing system is provided having means for printing pixels in the region having the first spot size and means for printing border pixels having spot sizes smaller than the first spot size.

US Patent:

54226643, Jun 6, 1995

Filed:

Jun 25, 1993

Appl. No.:

8/081898

Inventors:

Joseph F. Stephany - Williamson NY

Assignee:

Xerox Corporation - Stamford CT

International Classification:

B41J 205

US Classification:

347 14

Abstract:

A Thermal ink jet printer has a rotatable platen with an oscillator circuit mounted therein which includes a resonant vibratory device on which the ink droplets ejected from the printhead nozzles by electrical pulses are received and the mass thereof are measured. A piezoelectric sensor, such as a quartz crystal, serves as an environment for measuring the mass of ink droplets deposited on the crystal face. The difference in frequency before and after drop deposition is exactly proportional to the ink drop mass. Frequency change is measured to provide a feedback signal to the printer controlled for adjustment of the droplet ejecting pulses to control the drop size.

US Patent:

52607186, Nov 9, 1993

Filed:

Jan 2, 1992

Appl. No.:

7/816782

Inventors:

Heiko Rommelmann - Webster NY
James D. Rees - Pittsford NY
Richard F. Lehman - Penfield NY
David D. Hoesly - Webster NY
Joseph F. Stephany - Williamson NY
Gary S. Schwarz - Wayne NY

Assignee:

Xerox Corporation - Stamford CT

International Classification:

G01D 1514
G03G 1518

US Classification:

346107R

Abstract:

A xerographic printer especially suitable for printing copies of oversized original documents is enabled by staggering a plurality of image bars in optical alignment with a linear projection means such as gradient index lens arrays which are tilted at a preferred angle. The image bars are selectively addressed in response to digitized bit-mapped data inputs representing the document information. The modulated light outputs from the bars are transmitted as focused lines on the surface of the photoreceptor. The printer includes illumination lamps and a lamp aperture which parallels the staggered image bars. Further, a multi-function copier/printer is realized by combining a variation of the xerographic printer with a conventional imaging system for copying a document.

US Patent:

57451311, Apr 28, 1998

Filed:

Aug 3, 1995

Appl. No.:

8/510936

Inventors:

Gary A. Kneezel - Webster NY
William R. Burger - Fairport NY
Steven J. Harrington - Holley NY
Dale R. Ims - Webster NY
Joseph F. Stephany - Williamson NY

Assignee:

Xerox Corporation - Stamford CT

International Classification:

B41J 2205

US Classification:

347 15

Abstract:

A printing machine of the type in which liquid ink is deposited on a recording medium for printing gray scale images. The printing machine includes a printhead having ink ejecting nozzles of different sizes. Nozzles of the same size are arranged in groups and groups of nozzles are offset from one another. Ink drops of one group are deposited at locations corresponding to the points of a grid and ink drops of another group are deposited at locations corresponding to points not on the grid. Gray scale printing is achieved by the variation in drop size produced by different groups of nozzles as well as offsetting nozzles of one or more groups of nozzles from a reference group of nozzles printing on the points of a grid.

US Patent:

49499505, Aug 21, 1990

Filed:

Feb 14, 1989

Appl. No.:

7/310103

Inventors:

Joseph F. Stephany - Williamson NY

Assignee:

Xerox Corporation - Stamford CT

International Classification:

B65H 2900

US Classification:

271193

Abstract:

A system and method of transporting a sheet along a sheet path with electrostatic forces by applying corona charges to the sheet in pulses from high voltage corona generating electrodes in plural arrays extending along at least one side of the sheet path and subjecting the charged sheet to an electrical field pattern, defined by unevenly opposing electrodes spaced on the opposite side of the sheet path to provide an electrostatic force component acting on the charged sheet to move the sheet along the sheet path. The unevenly opposing electrodes may include grounded electrodes adjacent the downstream end of each array and commonly biased electrodes adjacent the upstream end of each array. Three different embodiments are illustrated.

US Patent:

56821840, Oct 28, 1997

Filed:

Dec 18, 1995

Appl. No.:

8/574089

Inventors:

Joseph F. Stephany - Williamson NY
Gary A. Kneezel - Webster NY
John H. Slowik - Penfield NY

Assignee:

Xerox Corporation - Stamford CT

International Classification:

B41J 2195
G01F 2300

US Classification:

347 7

Abstract:

A capacitor is created in an ink tank supplying ink to an ink jet printhead by placing parallel capacitive plates on sides of the tank with the ink therebetween acting as the capacitor dielectric. An electrical AC potential is applied across the capacitor. Changes in current flow through the plates are detected in a phase sensitive bridge circuit and digital signals are generated and sent to a processor for conversion into low ink level signals. The output signal is also used to identify a particular type of ink by either comparing points on a characteristic curve of the ink volume verses capacitance or, in a second embodiment, by periodically sweeping an applied oscillator voltage over a selected frequency range and comparing measured electrical resonance parameters for the ink tank capacitor with stored information about resonance parameters for different types of ink.

US Patent:

54226651, Jun 6, 1995

Filed:

May 28, 1993

Appl. No.:

8/068029

Inventors:

Joseph F. Stephany - Williamson NY
Richard V. LaDonna - Fairport NY
Gary A. Kneezel - Webster NY
Michael Poleshuk - Webster NY
Thomas A. Tellier - Williamson NY
Thomas E. Watrobski - Penfield NY
Joseph J. Wysocki - Webster NY

Assignee:

Xerox Corporation - Stamford CT

International Classification:

B41J 205

US Classification:

347 19

Abstract:

A thermal ink-jet printhead comprises a substrate having a plurality of heating elements defined thereon. A thermistor, disposed on the substrate, includes a conductor loop which does not encompass the heating elements on the substrate. The configuration of the thermistor significantly reduces both electromagnetic and capacitance interference caused by the heating elements.

US Patent:

47831464, Nov 8, 1988

Filed:

Jan 20, 1987

Appl. No.:

7/004932

Inventors:

Joseph F. Stephany - Williamson NY
Andras I. Lakatos - Penfield NY
Virgil J. Hull - Perinton NY
Alain E. Perregaux - Pittsford NY

Assignee:

Xerox Corporation - Stamford CT

International Classification:

G02F 113

US Classification:

350331R

Abstract:

A linear array of liquid crystal shutters mounted near a photoreceptor surface and arranged transversely to the direction of travel of the photoreceptor surface, an array of thin film transistors connected to the array of liquid crystal shutters for electrically driving the shutters and logic means connected to the array of thin film transistors selectively pulsing the liquid crystal shutters to selectively expose the photoreceptor surface a line at a time. The system further includes circuit means for producing an electric field between the opposed electrodes of each of the liquid crystal shutters to prevent passage of light through the shutters and means for selectively de-energizing each of the pairs of electrodes for predetermined time period in response to the receipt of input data signals.