Xerox Corporation

Palo Alto Research Center Inc.

Conduent Business Services, LLC

Additive Technologies LLC

Palghat Srinivas Ramesh

Joseph C Sheflin

Anthony Salvatore Condello

Peter John Knausdorf

Peter Paul

Paul J McConville

Bruce Earl Thayer

Jack T LeStrange

Aaron Michael Burry

Chu-Heng Liu

Lalit Keshav Mestha

Raja Bala

Peter M Gulvin

Eric Michael Gross

Jack Thomas Lestrange

David Allen Mantell

Gerald M Fletcher

Michael D Thompson

Patrick Jun Howe

Jason Mathew LeFevre

Trevor James Snyder

Eric Scott Hamby

Mark Anthony Cellura

Daniel M Bray

Rachael L McGrath

Christopher Auguste Dirubio

Bin Zhang

Douglas K Herrmann

Seemit Praharaj

Michael F Zona

Joerg Martini

Vladimir Kozitsky

Alexander J Fioravanti

Santokh Singh Badesha

David Kalman Biegelsen

Pinyen Lin

Steven Robert Moore

David Joseph Gervasi

Mandakini Kanungo

Joel A Kubby

Dale Robert Mashtare

John F Knapp

Matthew Adam Shreve

Robert Roy Price

James Edward Williams

Timothy Patrick Foley

Ali Rafic Dergham

Paul C Julien

Baomin Xu

Anne Plochowietz

Joannes N M De Jong

Lawrence Floyd, Jr

Glenn David Batchelor

Jeffrey J Folkins

Wencheng Wu

Edgar A Bernal

Linn C Hoover

Beilei Xu

Paul Michael Fromm

Erwin Ruiz

William H Wayman

Roger Gaylord Leighton

David Mathew Johnson

Bing R Hsieh

Timothy D Stowe

Eliud Robles Flores

Gerald A Domoto

Ashish V Pattekar

Orhan Bulan

Jengping Lu

Joseph Benjamin Gault

Alvaro Enrique Gil

Carlos Manuel Terrero

David A VanKouwenberg

Jorge Antonio Alvarez

Steven C Hart

Philipp Helmut Schmaelzle

Thomas Wunderer

Jing Zhou

Ajay Kumar

Gregory B Anderson

Francisco Zirilli

Sriganesh Madhvanath

Donald M Bott

Tong Sun

Martin Krucinski

Bruce J Parks

Jayant Kumar

James Michael Chappell

Matthew Michael Kelly

Shu Chang

Arvind Agarwal

Qun Li

Robert J Kleckner

Charles Anthony Radulski

Christine Ann Steurrys

Rachel Lynn Tanchak

Gary Walker Skinner

David Alan Vankouwenberg

Robert E Rosdahl, Jr

A three-dimensional (3D) metal object manufacturing apparatus is configured to eject melted metal drops from an ejector head at different velocities to form different portions of metal object layers with different measurable values of a same physical property. The different velocities are achieved by operating the ejector head with two different electrical voltages. The greater voltage that achieves the higher velocity is about 25% greater than the voltage used to achieve the lesser velocity. By operating the ejector head with the two different voltages different portions of the object can be formed with different physical property characteristics.

Metal drop ejecting three-dimensional (3D) object printer and improved method for operating the printer

A printing system and method of inspecting drop ejection in a printing system is disclosed. The method includes capturing an image of each of a plurality of drops of a print material after ejection from an ejector of a printing system, creating a temporally averaged image from each image of the plurality of drops of print material, and classifying one of the plurality of drops of print material based on the temporally averaged image that was created. The use of a pretrained convolutional neural network for classifying one of the plurality of drops and comparing the temporally averaged image to another temporally averaged image to classify one of the plurality of drops may be employed. The printing system also includes a camera with a high-speed shutter where the shutter is synchronized to an ejector pulse, and a video analytic framework coupled to the ejector and the camera configured to generate a jetting result for each of the one or more drops of liquid print material.

Inspection system for three-dimensional printer and methods thereof

A method of inkjet printer operation indicates a need for a remedial printhead operation by predicting a number of inoperative inkjets and locations for the inoperative inkjets in at least one printhead in the inkjet printer at a predetermined time. The prediction is made using Markov chain Monte Carlo models that correspond to different ranges of area coverage density for inkjet areas of a printhead.

System and method for predicting inoperative inkjets within printheads in an inkjet printer

A method of inkjet printer operation identifies a problem with an inkjet printer using a comparison of an index for a printhead map identifying inoperative inkjets in a printhead with indexes for clusters of extracted feature descriptors corresponding to printhead maps for printheads having inoperative inkjets stored in a dictionary in a database operatively connected to a controller in the inkjet printer. The dictionary is developed using unsupervised cluster analysis of datasets comprised of printhead maps identifying inoperative inkjets in a plurality of printheads.

System and method for diagnosing inoperative inkjet patterns within printheads in an inkjet printer

A method includes ejecting a plurality of drops of a build material from a nozzle of a 3D printer. The build material cools and solidifies after being ejected to form a 3D object. The method also includes controlling an oxidation of the drops, the 3D object or both to create different oxidation levels in first and second portions of the 3D object.

Atmosphere and part formation in a liquid metal drop-on-demand printer

An MFD is disclosed. For example, the MFD includes a printhead to dispense print material, an enhancement printhead to dispense an enhancement printing fluid, a processor and a non-transitory computer-readable medium storing a plurality of instructions. The instructions when executed by the processor cause the processor to perform operations that include determining that an automated enhancement feature was selected, analyzing each pixel of an image to be printed to determine one or more pixels that are to receive the enhancement printing fluid, controlling the printhead to print the image, and controlling the enhancement printhead to dispense the enhancement printing fluid on the one or more pixels that are to receive the enhancement printing fluid.

Automated enhancement of printed documents

A method includes defining a model for a liquid while the liquid is positioned at least partially within a nozzle of a printer. The method also includes synthesizing video frames of the liquid using the model to produce synthetic video frames. The method also includes generating a labeled dataset that includes the synthetic video frames and corresponding model values. The method also includes receiving real video frames of the liquid while the liquid is positioned at least partially within the nozzle of the printer. The method also includes generating an inverse mapping from the real video frames to predicted model values using the labeled dataset. The method also includes reconstructing the liquid in the real video frames based at least partially upon the predicted model values.

Characterizing liquid reflective surfaces in 3D liquid metal printing

A three-dimensional (3D) printer includes a nozzle and a camera configured to capture a real image or a real video of a liquid metal while the liquid metal is positioned at least partially within the nozzle. The 3D printer also includes a computing system configured to perform operations. The operations include generating a model of the liquid metal positioned at least partially within the nozzle. The operations also include generating a simulated image or a simulated video of the liquid metal positioned at least partially within the nozzle based at least partially upon the model. The operations also include generating a labeled dataset that comprises the simulated image or the simulated video and a first set of parameters. The operations also include reconstructing the liquid metal in the real image or the real video based at least partially upon the labeled dataset.

A 3D printer includes a nozzle configured to jet a drop of liquid metal therethrough. The 3D printer also includes a light source configured to illuminate the drop with a pulse of light. A duration of the pulse of light is from about 0.0001 seconds to about 0.1 seconds. The 3D printer also includes a camera configured to capture an image, video, or both of the drop. The 3D printer also includes a computing system configured to detect the drop in the image, the video, or both. The computing system is also configured to characterize the drop after the drop is detected. Characterizing the drop includes determining a size of the drop, a location of the drop, or both in the image, the video, or both.

System and method for characterizing liquid metal drops jetted from a 3D printer using a strobe light

Ink-based digital printing systems useful for ink printing include a rotatable charge-retentive reimageable surface layer configured to receive a layer of fountain solution. The fountain solution is carried to the charge retentive surface by a fog or mist including fountain solution aerosol particles, dispersed gas particles, and charge directors that impart charge to the fountain solution aerosol particles. The charge-retentive reimageable surface may be charged to a uniform potential, and selectively discharged using an ROS according to image data to form an electrostatic latent image. The charged fountain solution adheres to portions of the charge-retentive reimageable surface according to the electrostatic latent image to form a fountain solution image thereon. The fountain solution image can be partially transferred to an imaging blanket, where the fountain solution image is inked. The resulting ink image may be transferred to a print substrate.

Charged particle generation, filtration, and delivery for digital offset printing applications

An image based correction system compensates for the image quality artifacts induced by thermal ghosting on evolving imaging member surfaces. With thermal ghosting directly tied to previous image content, a feed forward system determines thermal ghosting artifacts based on images previously rendered and generates an open loop gray-level correction to a current image that mitigates undesirable ghosting. For example, the correction system compensates for the thermal ghosting by making the current image 'lighter' in areas that will be imaged onto warmer blanket regions, thereby cancelling out TRC differences between different temperature regions. A temperature sensor is used to measure the temperature of the imaging blanket due to the stresses induced by the image. This data is used to learn the parameters of the temperature model periodically during operation, and used in subsequent corrections to mitigate thermal ghosting in spite of changes in blanket properties over use and time.

Image based learning correction for mitigating thermal ghosting in a digital printer

A printing system comprises an ink deposition assembly and a media transport device. The ink deposition assembly comprises printheads to deposit a print fluid, such as ink, on print media, such as paper. The media transport device holds the print media against a movable support surface, such as a belt, by vacuum suction platen and transports the print media though a deposition region. The vacuum suction is communicated to the movable through platen holes and platen channels in a vacuum platen. At least some of the platen channels have a high impedance region that has a reduced open cross-sectional area as compared to another region of the platen channel.

Airflow control through vacuum platen of a printing system, and related devices, systems, and methods

A color inkjet printer includes an electrode that emits an electric field into a gap between a printhead and a media transport that carries media past the printhead. Image data generated by an optical sensor after an ink image is printed on the media is analyzed to measure at least one image quality metric. When the measured image quality metric is outside of a tolerance range, the voltage of a voltage source electrically connected to the electrode is adjusted to improve the wetting of the media type with the ink ejected by the printhead.

System and method for printing color images on substrates in an inkjet printer

A printing system comprises a print fluid deposition assembly, a media transport device, and an air flow control system. The print fluid deposition assembly comprises a carrier plate and a printhead arranged to eject a print fluid through an opening of the carrier plate to a deposition region. The media transport device holds a print medium against the movable support surface by vacuum suction and transports the print medium through the deposition region. The air flow control system comprises an air supply unit comprising air flow guide structure extending into the opening of the carrier plate between the carrier plate and the printhead to flow air through the opening. The air flow control system controls the air supply unit to selectively flow the air based on a location of a print medium relative to the printhead.

Devices, systems, and methods for supplying makeup air through openings in carrier plates of printing systems via air guide structures extending into the openings

A method of operating a printer extends the print zone of the printer by separating at least two printhead modules in the print zone by a distance that is greater than a width of a printhead module. The printhead modules are operated to print multiple color separations of an ink image and operates an optical sensors generates image data of the printed multiple color separations. The image data of the printed color separations are used to adjust distances between printhead modules in the print zone.

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Pittsford, NY, United States of America

Palghat Srinivas Ramesh