公开(公告)号：US11577503B2

公开(公告)日：2023-02-14

申请号：US17177262

申请日：2021-02-17

Applicant: Xerox Corporation

Inventor： Jack T. Lestrange ,  Joseph C. Sheflin ,  Palghat S. Ramesh ,  Anthony S. Condello ,  Brian M. Balthasar ,  Seemit Praharaj ,  Chu-heng Liu ,  Paul J. Mcconville ,  Douglas K. Herrmann ,  Jason M. Lefevre

IPC: B41F33/00 ,  B41M1/06 ,  G01F1/28 ,  G01N33/32

Abstract: A drag force sensor on a fountain solution carrier roller surface measures drag force of a fountain solution layer on the fountain solution carrier roller surface in real-time during a printing operation. The measured drag force is used in a feedback loop to actively control the fountain solution layer thickness by adjusting the volumetric feed rate of fountain solution added onto the imaging member surface during a printing operation to reach a desired uniform thickness for the printing. This fountain solution monitoring system may be fully automated.

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.

公开(公告)号：US11325799B2

公开(公告)日：2022-05-10

申请号：US16570577

申请日：2019-09-13

Applicant: Xerox Corporation

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

IPC: B65H5/22 ,  B65H5/06

Abstract: A vacuum roller system and a method of operation the vacuum roller system can include an assembly of interdigitated rollers, and a vacuum system, wherein the assembly of interdigitated rollers is operably connected to the vacuum system to move sheets of media through a downstream dryer in a printer, wherein a vacuum is drawn between individual rollers among the assembly of interdigitated rollers so that the vacuum is distributed across a sheet of media and is split around the individual rollers. The spacing between the individual rollers among the assembly of interdigitated rollers is variable to vary the vacuum.

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.

公开(公告)号：US20180136564A1

公开(公告)日：2018-05-17

申请号：US15354267

申请日：2016-11-17

Applicant: Xerox Corporation

Inventor： Douglas K. Herrmann ,  Jason M. Lefevre ,  Paul J. McConville ,  Steven R. Moore

IPC: G03F7/20 ,  G02B26/08

CPC classification number: G03F7/702 ,  B41J2/447 ,  B41J2/455 ,  G02B26/0833

Abstract: A laser imaging system and method for printing includes a digital micromirror device and a switchable mirror element that acts as a clear lens element during the printing by the laser imaging system. A laser diode array provides a laser to the switchable mirror element in a laser path, wherein the switchable mirror element is located in the laser path between the laser diode array and the digital micromirror device to divert energy out of the system and away from the digital micromirror device during periods of non-laser imaging without reducing or powering down the laser system.