公开(公告)号：US20220314653A1

公开(公告)日：2022-10-06

申请号：US17218887

申请日：2021-03-31

申请人： XEROX CORPORATION

发明人： Chu-Heng LIU ,  Douglas K. HERRMANN ,  Jason M. LeFEVRE ,  Paul J. McCONVILLE ,  Seemit PRAHARAJ

IPC分类号： B41J11/00

摘要： A printing system comprises a printhead to eject a print fluid to a deposition region. Print media are held against a movable support surface via vacuum suction, and the movable support surface transports the print media through the deposition region. A vacuum plenum comprises a vacuum platen over which the movable support surface moves. The vacuum platen has platen holes that communicate the vacuum suction from the vacuum plenum to the movable support surface. An airflow restriction mechanism forms a high impedance zone in the vacuum platen, the high impedance zone comprising a subset of the platen holes. The airflow impedance through the high impedance zone is relatively high compared to the airflow impedance through another subset of the platen holes, which are part of a low impedance zone. The high impedance zone may be located near the printhead to reduce airflow through uncovered platen holes near the printhead.

公开(公告)号：US20220314650A1

公开(公告)日：2022-10-06

申请号：US17217466

申请日：2021-03-30

申请人： XEROX CORPORATION

发明人： Seemit PRAHARAJ ,  Douglas K. HERRMANN ,  Jason M. LeFEVRE ,  Chu-Heng LIU ,  Paul J. McCONVILLE

IPC分类号： B41J11/00

摘要： A printing system comprises a printhead to eject ink through an opening in a carrier plate to a deposition region. A print medium is held against a movable support surface by vacuum suction communicated through platen holes of a vacuum platen and transported through the deposition region. An airflow control system comprises upstream and downstream valves associated with the printhead, individually addressable channels for the vacuum platen, or both. The upstream and downstream valves are arranged to selectively block and allow airflow through an upstream side or a downstream side, respectively, of the opening in the carrier plate. Actuation of the upstream and downstream valves may be controlled based on a location of the print medium. The channels are arranged to selectively control the supply of vacuum suction to respectively corresponding columns of platen holes. Actuation of the channels may be controlled based on a size of the print medium.

公开(公告)号：US20220305817A1

公开(公告)日：2022-09-29

申请号：US17216232

申请日：2021-03-29

申请人： XEROX CORPORATION

发明人： Douglas K. HERRMANN ,  Jason M. LeFEVRE ,  Chu-Heng LIU ,  Paul J. McCONVILLE ,  Seemit PRAHARAJ

IPC分类号： B41J11/00

摘要： 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 printhead to eject a print fluid through an opening of a 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 to selectively flow air through the opening based on a location of a print medium relative to the printhead. The air supply unit comprises an air guide structure comprising an air outlet portion extending into the opening of the carrier plate between the printhead and the carrier plate, the air outlet portion terminating in an end wall that is angled obliquely relative to the movable support surface towards a reverse-process direction.

公开(公告)号：US20220258464A1

公开(公告)日：2022-08-18

申请号：US17177262

申请日：2021-02-17

申请人： Xerox Corporation

发明人： 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分类号： B41F33/00 ,  B41M1/06 ,  G01F1/28

摘要： 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：US20240173769A1

公开(公告)日：2024-05-30

申请号：US18059638

申请日：2022-11-29

申请人： XEROX CORPORATION

发明人： Douglas K. HERRMANN ,  Jason M. LeFEVRE ,  Seemit PRAHARAJ ,  Varun SAMBHY

IPC分类号： B22D23/00 ,  B22D46/00 ,  B33Y10/00 ,  B33Y30/00 ,  B33Y50/02

CPC分类号： B22D23/003 ,  B22D46/00 ,  B33Y10/00 ,  B33Y30/00 ,  B33Y50/02

摘要： A system and method of characterizing drops of printing material in a 3D printer is disclosed, which includes ejecting a drop from a nozzle of an ejector in the 3D printer, intersecting the drop with a beam while the drop is in-flight, and determining one or more physical characteristics of the drop. The system and method may include where the drop intersects the beam between the nozzle and a substrate of the 3D printer or the drop intersects the beam between the nozzle and a top surface of a part printed by the 3D printer. The beam is located between an emitter and a detector are each positioned external to one or more side walls of a 3D printer. A physical characteristic of the drop may include drop size, drop shape, or drop mass and comparison with a reference.

公开(公告)号：US20220305819A1

公开(公告)日：2022-09-29

申请号：US17216261

申请日：2021-03-29

申请人： XEROX CORPORATION

发明人： Patrick Jun HOWE ,  John Patrick BAKER ,  Brian M. BALTHASAR ,  Glenn BATCHELOR ,  Anthony Salvatore CONDELLO ,  Ali R. DERGHAM ,  Timothy P. FOLEY ,  Douglas K. HERRMANN ,  Richard A. KALB ,  Peter John KNAUSDORF ,  Jason M. LeFEVRE ,  Jack T. LESTRANGE ,  Chu-Heng LIU ,  Paul J. McCONVILLE ,  Seemit PRAHARAJ ,  Palghat S. RAMESH ,  Joseph C. SHEFLIN ,  Emmett James SPENCE ,  Robert Jian ZHANG ,  Megan ZIELENSKI

IPC分类号： B41J11/00 ,  B41J2/01

摘要： 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.

公开(公告)号：US20220305815A1

公开(公告)日：2022-09-29

申请号：US17216175

申请日：2021-03-29

申请人： XEROX CORPORATION

发明人： Douglas K. HERRMANN ,  Linn C. HOOVER ,  Patrick Jun HOWE ,  Joseph C. SHEFLIN ,  Robert Jian ZHANG ,  John Patrick BAKER ,  Brian M. BALTHASAR ,  Glenn BATCHELOR ,  Anthony Salvatore CONDELLO ,  Ali R. DERGHAM ,  Timothy P. FOLEY ,  Richard A. KALB ,  Peter John KNAUSDORF ,  Jason M. LeFEVRE ,  Jack T. LESTRANGE ,  Chu-Heng LIU ,  Paul J. McCONVILLE ,  Seemit PRAHARAJ ,  Palghat S. RAMESH ,  Erwin RUIZ ,  Emmett James SPENCE ,  Rachel Lynn TANCHAK ,  Kareem TAWIL ,  Carlos M. TERRERO ,  Megan ZIELENSKI

IPC分类号： B41J11/00

摘要： 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 comprises a movable support surface to transport a print medium along a process direction through the deposition region, the media transport device holding the print medium against the movable support surface by vacuum suction. The air flow control system is arranged to selectively flow air through the opening of the carrier plate between the carrier plate and the printhead based on a location of a print medium transported by the media transport device relative to the printhead.

公开(公告)号：US20220205778A1

公开(公告)日：2022-06-30

申请号：US17137473

申请日：2020-12-30

申请人： Xerox Corporation

发明人： Chu-heng LIU ,  Paul J. MCCONVILLE ,  Jason M. LEFEVRE ,  Douglas K. HERRMANN ,  Seemit PRAHARAJ

IPC分类号： G01B11/06 ,  B41M1/06

摘要： According to aspects of the embodiments, there is provided a method of measuring the amount of fountain solution employed in a digital offset lithography printing system. Fountain solution thickness is measured using a diffractive optical element (DOE) configured with grating surfaces varying in a periodic fashion to hold an amount of fountain solution. When radiated with a light source the combination of the grating surface and the fountain solution therein reduces the scattering of the surface structure (“contrast”) that gives rise to a diffraction pattern. The diffractive optical element can be placed on the printing blanket of the lithography printing system or on a separate substrate.

公开(公告)号：US20240034079A1

公开(公告)日：2024-02-01

申请号：US17816488

申请日：2022-08-01

申请人： Xerox Corporation

发明人： Seemit PRAHARAJ ,  Jason LEFEVRE ,  Douglas K. HERRMANN ,  Jorge A. ALVAREZ ,  Chu-Heng LIU ,  Yumeng WU

IPC分类号： B41J29/377 ,  B41J11/00 ,  B41J11/42

CPC分类号： B41J29/377 ,  B41J11/0015 ,  B41J11/42

摘要： Disclosed is a system and method for cooling paper within a printer assembly that includes at least one misting assembly designed to mist an aqueous solution onto an unprinted surface of paper stock after a first side is printed. At least one convection accelerator assembly is designed to accelerate evaporation of the aqueous solution before the printed paper stock arrives at the at least one printing station for printing on the unprinted surface. At least one or more of a paper temperature, machine temperature, printhead temperature, and humidity sensor are operationally coupled to at least one controller assembly programmed to control at least one or more of misting, humidity, and airflow. The at least one controller assembly is designed to determine the heat to be dissipated into the airflow from the printed paper stock to obtain a targeted paper temperature and, therefore, the amount and placement of aqueous solution misted.

公开(公告)号：US20220410560A1

公开(公告)日：2022-12-29

申请号：US17358634

申请日：2021-06-25

申请人： Xerox Corporation

发明人： Seemit PRAHARAJ ,  Chu-heng LIU ,  Paul J. MCCONVILLE ,  Douglas K. HERRMANN ,  Jason M. LEFEVRE

IPC分类号： B41F31/02 ,  B41F31/13

摘要： A coefficient of friction (COF) sensor on a carrier roll surface wetted with fountain solution transferred from an imaging member measures COF of the wetted carrier roll surface in real-time, even between or during printing operations. The transferred fountain solution may be concentrated and/or chilled to solidify before the measurement. The measured COF 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 an imaging or other printing operation to reach a desired uniform thickness for the printing. This fountain solution monitoring system may be fully automated.