Xerox Corporation

James Dudley Padgett

Terrance Lee Stephens

John Milton Brookfield

Brian Edward Sonnichsen

John S Moore

Eric C Segerstrom

Rodney Bryant Hill

Christine M Greiser

John Richard Andrews

David Lyell Knierim

Brian Edward Williams

Stephan V Drappel

Trevor James Snyder

Jeffery H Banning

Andrew Wayne Hays

Joseph Benjamin Gault

David Paul Platt

Ronald F Burr

Tony Russell Rogers

David R Koehler

Douglas Dean Darling

Mark J Maynard

Garry A Jones

Sharon S Berger

Michael Joel Edwards

Lisa Marie Schmidt

David W Hanks

Russell J Watt

Christian Amoah-Kusi

Tygh James Newton

Chanthy Luy

Ruander Cardenas

Cory Daniel Luth

Daniel Mark Platt

Timothy J Jones

Takahiro Peter Terayama

Monica Louise Maestas

Kenneth Eugene Strohmeyer, Jr

A three-dimensional object printer compensates for variations in ejected material drop volumes by adjusting firing signal parameters. The printer includes an optical sensor that generates height measurement data of columns of material in a test pattern. Differences between the height of columns of material in the test pattern formed by the ejectors in the printhead and the expected height of the columns are compared to a predetermined range to detect drop variations that are out of tolerance. The modification of the firing signal parameter adjust the operation of the ejectors to bring the volume of the drops ejected by the ejector within tolerance range to reduce the ink drop velocities of the ejected drops within a predetermined range.

System for compensating for drop volume variation between inkjets in a three-dimensional object printer

A method for operating an inkjet printer includes identifying a pattern of ink drops ejected from an inkjet with reference to image data for a printed image, identifying a waveform component for an electrical signal operating the inkjet to eject an ink drop in the pattern of ink drops with reference to at least a portion of the image data, and generating the electrical signal with the identified waveform component to eject the ink drop in the pattern of ink drops at a first velocity onto a first location of an image receiving surface.

System and method for per drop electrical signal waveform modulation for ink drop placement in inkjet printing

A process where there is deposited on a supporting substrate at least one first polymer layer and optionally at least one second polymer layer followed by treating the resulting formed layers or laminate with a laser.

Lamination processes

Disclosed are compounds of the formulae wherein R, R, R, R, R, R, R, R, R, and Rare hydrogen, alkyl, aryl, arylalkyl, or alkylaryl, R, R, and Rare alkylene, arylene, arylalkylene, or alkylarylene, and the chromogen moiety is an atom or group of atoms that impart color to the compound in the visible, infrared, or ultraviolet wavelength range.

Colored polysiloxanes

A printhead for printing ink includes a particulate filter manufactured from a polymer sheet such as a polyimide sheet. Filter openings within the particulate filter can be formed using a mask and a laser beam to ablate exposed portions of the polymer sheet. Embodiments of the present teachings can result in the formation smaller filter openings at a smaller pitch within the polymer sheet than, for example, stainless steel particulate filters, and thus more openings which cover a larger percentage of the filter surface for a given filter size, which can result in a reduction of fluid pressure within the printhead. Thus smaller filter openings for improved filtering of smaller particulates can be formed while maintaining a sufficient ink flow at a sufficiently low pressure within the printhead during operation.

Polymer internal contamination filter for ink jet printhead

An imaging device includes an image receiving surface movably supported within the imaging device and at least one printhead having a plurality of ink jets, each ink jet being configured to eject drops of ink on the image receiving surface. At least one sensing electrode is positioned adjacent the image receiving surface that outputs capacitance signals indicative of a capacitance in a gap between the at least one sensing electrode and image receiving surface that are output to a controller. The imaging device includes a drop mass detection mode of operation in which: at least one ink jet in the plurality of ink jets is actuated to eject drops of ink to form at least one test band on the image receiving surface; the image receiving surface is moved so that the at least one test band of ink is positioned in the gap; the at least one sensing electrode outputs a test band capacitance signal indicative of a capacitance with the at least one test band in the gap; and the controller modifies an operating parameter of the imaging device based on the capacitance indicated by the test band capacitance signal.

Capacitive drop mass measurement system

A drop generator includes a pressure chamber and a flexible diaphragm plate disposed on the chamber and forming a wall of the pressure chamber. A piezoelectric transducer having a bottom surface is attached to the diaphragm plate. The diaphragm plate includes a recess that forms a perimeter around the bottom surface of the transducer that partially underlies at least one edge of the bottom surface. An inlet channel is connected to the pressure chamber and configured to direct ink to the pressure chamber from a manifold. An outlet channel is connected to the pressure chamber to receive ink from the pressure chamber and has a channel axis that is perpendicular to the diaphragm plate. The outlet channel includes a first outlet channel section and a second outlet channel section. The first outlet channel section includes a plurality of subsections having alternating diameters. The second outlet channel section includes an aperture disposed at an end thereof. The second outlet channel section has a substantially continuous cross-sectional shape and a length that is greater than a length of the first outlet channel section.

Drop generator

An inkjet finger manifold is provided that includes a longitudinal manifold chamber with an entrance at a first end adjacent to a first longitudinal side. A purge vent is located at a second end on a second longitudinal side opposite the first longitudinal side. A first ramp is located at the first end sloping away from the entrance toward the second longitudinal side. A second ramp is located near the second end and slopes from the second longitudinal side toward the second end and the first longitudinal side to alter the laminar flow of the ink through the longitudinal manifold.

Inkjet finger manifold

A banding adjustment method for an ink jet imaging device having a plurality of printheads comprises printing a plurality of test bands, each test band being printed by a plurality of printheads such that each printhead of the plurality prints a section of each test band. The drop mass generated by each printhead of the plurality is selectively adjusted between a default drop mass and an adjusted drop mass to print each test band of the plurality such that the plurality of printed test bands have various combinations of sections having the default drop mass and the adjusted drop mass. The user is then prompted to select a test band from the plurality of printed test bands.

Banding adjustment method for multiple printheads

A printhead reservoir has an input ink port and a chamber to receive ink from an ink source through the input ink port. The reservoir also has a filter in a path between the input ink port and the chamber. A printhead includes a reservoir having an input ink port, a chamber to receive ink from an ink source through the input port and a filter in a path between the input port and the storage plate. The printhead also includes an array of jets to draw ink from the chamber and control circuitry to control the jets so as to selectively output ink through the jets onto a substrate. A reservoir has a filter to receive ink, a vented chamber to collect ink received from the filter and at least one jet to receive ink from the vented chamber. The vented chamber is between the ink filter and the fluid path to the jets in order to remove the filter portion of the pressure drop to the jets.

Printhead reservoir with filter external to jet fluid path

A container including a first tank for receiving a liquid, a second tank that is selectively pressurizable, a check valve for permitting fluid flow from the first tank to the second tank, and a manifold structure having a first port fluidically coupled to the first tank and a second port fluidically coupled to the second tank.

Ink jet apparatus

A drop emitting device including a first linear array of columnar arrays of first nozzle pairs and a second linear array of columnar arrays of second nozzle pairs, wherein the first linear array and the second linear array extend along an X-axis, and wherein the second linear array is adjacent the first linear array such that each first nozzle pair has an associated second nozzle pair displaced therefrom along a Y-axis that is orthogonal to the X-axis. The columnar arrays of first nozzle pairs and the columnar arrays of second nozzle pairs extend obliquely to the X-axis.

Drop generating apparatus

A drop emitting device including a first linear array of columnar arrays of first nozzle pairs and a second linear array of columnar arrays of second nozzle pairs wherein the first linear array and the second linear array extend along an X-axis, and wherein the second linear array is adjacent the first linear array such that each first nozzle pair has an associated second nozzle pair displaced therefrom along a Y-axis that is orthogonal to the X-axis. The columnar arrays of first nozzle pairs and the columnar arrays of second nozzle pairs extend obliquely to the X-axis.

Growing community of inventors

Lake Oswego, OR, United States of America

James Dudley Padgett