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    Fountain solution film thickness measurement system using Fresnel lens optical properties
    11.
    发明授权
    Fountain solution film thickness measurement system using Fresnel lens optical properties 有权

    公开(公告)号：US11370216B1

    公开(公告)日：2022-06-28

    申请号：US17161879

    申请日：2021-01-29

    Applicant: Xerox Corporation

    Inventor： Douglas K. Herrmann ,  Chu-Heng Liu ,  Seemit Praharaj ,  Jason M. Lefevre ,  Paul J. McConville

    IPC: B41F7/24 ,  G01B11/02 ,  B41F31/02

    Abstract: An apparatus and method for measuring the thickness of fountain solution (FS) in a Digital Architecture for Lithographic Ink (DALI) printing system by transferring the FS to an optical roller with the properties of a lens and measuring the resulting effect on the refraction of an image captured through the lens. The optical roller may comprise a clear or glass cylinder forming a Fresnel lens cylinder having an engineered surface of known surface roughness and wherein the roller is placed adjacent the image member blanket. A heat source is used to evaporate the FS from the blanket for transfer to the optical roller where the FS wets the roller surface to different degrees based on the FS thickness relative to Fresnel ridge depth. Changes to the optical refraction through the lens varies with the FS thickness. An image sensor (e.g., a CCD camera or image analysis system) evaluates the image through the optical roller for FS thickness determination.

    Method and system for applying a finish to three-dimensional printed objects
    15.
    发明授权
    Method and system for applying a finish to three-dimensional printed objects 有权

    公开(公告)号：US11059225B2

    公开(公告)日：2021-07-13

    申请号：US15157966

    申请日：2016-05-18

    Applicant: Xerox Corporation

    Inventor： Chu-Heng Liu

    IPC: B29C64/209 ,  B29C64/112 ,  B29C64/10 ,  B33Y10/00 ,  B33Y30/00 ,  B33Y50/02 ,  B29K105/00

    Abstract: A three-dimensional object printer varies the finish in exposed surfaces of a printed object. The printer includes a controller operatively connected to at least two ejector heads, a leveling device, a curing device, and an actuator that is operatively connected to a member to which the at least two ejector heads, the leveling device, and the curing device are mounted. The controller is configured to detect a next layer to be formed being within a predetermined number of layers before an exposed surface is formed, to modify rendered data for the layers within the predetermined number of layers received from the source of rendered data, and to operate a plurality of ejectors in the at least two ejector heads with reference to the modified rendered data to apply a finish to the exposed surface.

    ACTIVE AIRFLOW CONTROL DEVICE FOR VACUUM PAPER TRANSPORT
    17.
    发明申请
    ACTIVE AIRFLOW CONTROL DEVICE FOR VACUUM PAPER TRANSPORT 有权

    公开(公告)号：US20210138803A1

    公开(公告)日：2021-05-13

    申请号：US16679220

    申请日：2019-11-10

    Applicant: Xerox Corporation

    Inventor： Jason M. Lefevre ,  Seemit Praharaj ,  Michael J. Levy ,  Douglas K. Herrmann ,  Paul McConville ,  Chu-Heng Liu ,  Linn C. Hoover ,  David A. VanKouwenberg

    IPC: B41J11/00 ,  B65H5/22

    Abstract: A marker transport system and a method of operating the marker transport system. A group of print bars is located with respect to a marker transport platen and a marker transport belt. A vacuum source and a pneumatic solenoid block are associated with the marker transport platen. The marker transport platen includes airflow sections divided into process-direction slots and cross-section direction slots. The cross-section direction slots are located beneath the print bars and are connected to the vacuum source via the pneumatic solenoid block, which facilitates an individual control of each of the cross-process direction slots. Pneumatic valves are associated with the pneumatic solenoid block, which supplies a flow of vacuum to the cross-process direction vacuum slots. The pneumatic vales can be timed to allow the vacuum to be present when a sheet is present over a corresponding vacuum slot among the process-direction slots and the cross-section direction slots.

    System and method for improving character edge formation on non-absorbing media
    18.
    发明授权
    System and method for improving character edge formation on non-absorbing media 有权

    公开(公告)号：US10717298B1

    公开(公告)日：2020-07-21

    申请号：US16018404

    申请日：2018-06-26

    Applicant: Xerox Corporation

    Inventor： David A. Mantell ,  Chu-Heng Liu ,  Seemit Praharaj ,  Stuart A. Schweid

    IPC: B41J2/21 ,  B41J2/045 ,  B41J11/00 ,  B41J2/14

    Abstract: A method of operating an inkjet printer that forms textual data with non-absorbing media ink on non-absorbing media forms the characters with structure that improves the integrity of the edges of the characters over previously known systems. The method includes modifying character pixels in image data used to generate firing signals for operating inkjets in a print head of an inkjet imaging device, generating firing signals for operating the inkjets from the modified character pixels, and operating the inkjets in the print head with the generated firing signals to eject drops of non-absorbing media ink onto non-absorbing media to form characters on the non-absorbing media. The character pixel modification reduces a number of character pixels in a connecting zone of a character that have a value that corresponds to a firing signal that activates an inkjet.

    Waterless UV inkjet transfer system and method
    20.
    发明授权
    Waterless UV inkjet transfer system and method 有权

    公开(公告)号：US10442214B2

    公开(公告)日：2019-10-15

    申请号：US16189153

    申请日：2018-11-13

    Applicant: XEROX CORPORATION

    Inventor： Anthony S. Condello ,  Paul J. McConville ,  Jack T. Lestrange ,  Chu-Heng Liu

    IPC: B41J11/00 ,  B41J2/005

    Abstract: A solid blanket receives a flood layer of very thin (e.g., about 10 μm or less) image receiving UV curable coating, which may be a clear, substantially clear, or tinted UV ink. A lower viscosity digital ink image may then be printed on top of the flood layer, for example by jetting UV ink on top of the flood layer. The lower viscosity UV digital ink sits on top of the thicker UV curable coating and maintains its location by surface tension interaction with the coating. The combination of ink and coating is then partially cured to a tacky state at which point it is transferred to print media via a conformable pressure nip. Since the lower viscosity jetted inks are not responsible for directly wetting the media, media latitude widens greatly. Further, no dampening fluid or fountain solution is needed to aid the transfer or the imaging.

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