公开(公告)号：US20230126205A1

公开(公告)日：2023-04-27

申请号：US17996082

申请日：2020-04-14

申请人： Hewlett-Packard Development Company, L.P.

发明人： Tal SHANI ,  Asaf SHOSHANI ,  Lavi COHEN ,  Zeharia LEVI

IPC分类号： G03G15/11 ,  G03G21/00

摘要： Disclosed is a liquid electrophotographic printing apparatus that comprises a developer roller, a cleaning member to contact the developer roller with a contact force and a force adjustment arrangement to adjust the contact force.

公开(公告)号：US20220317597A1

公开(公告)日：2022-10-06

申请号：US17634161

申请日：2019-10-16

申请人： Hewlett-Packard Development Company, L.P.

发明人： Ziv Seemann ,  Alexander Yekymov ,  Yuri Drutman ,  Yinon Harari ,  Shmuel Borenstain

IPC分类号： G03G15/11

摘要： In one example, a conduit for returning liquid printing material to a liquid printing material storage tank in a printer comprises a first tubular section and a second section for receiving a flow of liquid printing material from the first tubular section. The second section is arranged to convert the flow of liquid material received from the first section into a falling liquid curtain of liquid printing material that is output from the second section to flow to the liquid printing material tank.

公开(公告)号：US20210302877A1

公开(公告)日：2021-09-30

申请号：US17255611

申请日：2018-12-18

申请人： Hewlett-Packard Development Company, L.P.

发明人： Eric G. Nelson

IPC分类号： G03G15/11 ,  G03G15/00 ,  G06F3/12

摘要： A binary ink developer (BID) may include a power supply electrically coupled to an electrode, a developer roller, and a cleaner roller. The BID may also include a controller to determine a level of image ghosting based on a sum of currents at the electrode, the developer roller and the cleaner roller, and instruct the power supply to provide an adjusted voltage to the cleaner roller in response to a determination of the level of image ghosting.

公开(公告)号：US20210261890A1

公开(公告)日：2021-08-26

申请号：US16605262

申请日：2018-06-18

申请人： HEWLETT-PACKARD DEVELOPMENT COMPANY, L.P.

发明人： Eyal Bachar ,  Vladislav Kaploun

IPC分类号： C11D11/00 ,  C11D3/37 ,  C11D3/43 ,  C11D3/20 ,  C11D1/14 ,  C11D17/00 ,  G03G15/11 ,  G03G21/00

摘要： Described herein are methods of cleaning liquid electrophotographic printers and liquid electrophotographic cleaning compositions for use in such methods. The cleaning compositions comprise a resin and a charge director dispersed in a carrier liquid. The cleaning compositions comprise from about 3 wt. % to about 6 wt. % non-volatile solids (NVS). The methods comprise flushing upstream ink feed components of the liquid electrophotographic printer with the cleaning compositions.

公开(公告)号：US20210208521A1

公开(公告)日：2021-07-08

申请号：US16755927

申请日：2017-12-14

申请人： Hewlett-Packard Development Company, L.P.

发明人： Asaf Shoshani ,  Lavi Cohen ,  Shachar Berger

IPC分类号： G03G15/06 ,  G03G15/11

摘要： A method of printing images in a liquid electrophotographic printer is provided. In an example, the method comprises measuring at least one current associated with an image development unit of the liquid electrophotographic printer. A first time at which a peak occurs in the measured current is determined; the first time indicates that a printing substance is transferred from a point on a developer roller of the image development unit to a photo imaging member of the liquid electrophotographic printer at a first location within the image development unit. A second time at which said point on the developer roller is expected to contact the cleaner roller within the image development unit is calculated and, at the second time, a voltage applied to the cleaner roller is controlled to reduce the potential difference between the cleaner roller and the developer roller.

公开(公告)号：US11016420B2

公开(公告)日：2021-05-25

申请号：US16604340

申请日：2017-12-15

申请人： HEWLETT-PACKARD DEVELOPMENT COMPANY, L.P.

发明人： David Sabo ,  Blair A. Butler ,  Jeffrey Zampell ,  Avinoam Halpern ,  Sarah Ann Russell

IPC分类号： G03G15/11

摘要： A technique includes rotating a squeegee roller to regulate a film thickness of ink on a developer roller; and using the developer roller to transfer a portion of the ink from the developer roller to a photoconductive member. The technique includes creating, by an electrode, a potential bias with the developer roller to transfer the ink to the developer roller; and inhibiting flow streaks on the developer roller, where inhibiting the flow streaks includes restricting a flow of ink between the squeegee roller and the electrode.

公开(公告)号：US11016419B2

公开(公告)日：2021-05-25

申请号：US16487749

申请日：2017-03-13

申请人： HP INDIGO B.V.

发明人： David Sabo ,  John W. Godden

IPC分类号： G03G15/11 ,  G03G15/10

摘要： A binary printing fluid developer assembly may include a developer roller to receive a printing fluid and transfer a portion of the printing fluid to a photoconductive member; a number of electrodes to create an electrical potential bias between the number of electrodes and the developer roller; a cleaner roller to remove an amount of printing fluid from the developer roller; and a sponge roller to clean the cleaner roller wherein a gap is maintained between the sponge roller and the number of electrodes.

公开(公告)号：US11003111B2

公开(公告)日：2021-05-11

申请号：US16700083

申请日：2019-12-02

申请人： HP INDIGO B.V.

发明人： Giries Kadis ,  Marc Klein ,  Mark Sandler ,  Peter Nedelin ,  Marko Richter

IPC分类号： G03G15/11

摘要： An example apparatus includes a conveyor. The apparatus also includes a first developer unit. The first developer unit is to concentrate first printing liquid. The first developer unit also is to deliver the first printing liquid to the conveyor. The apparatus also includes a second developer unit. The second developer unit is to concentrate second printing liquid. The second developer also is to deliver the second printing liquid to the conveyor to form a thick layer of printing liquid comprising the first and second printing liquid.

公开(公告)号：US10983460B2

公开(公告)日：2021-04-20

申请号：US16606215

申请日：2017-10-31

申请人： HP Indigo B.V.

发明人： Shachar Berger ,  Sagie Shanun ,  Ziv Yosef ,  Shay Rahamim

IPC分类号： G03G15/11 ,  G03G15/10 ,  G03G21/10 ,  G03G21/12

摘要： In one aspect an apparatus for use in an electrographic printer is described. The apparatus includes a housing having a base, a first wall, and a second wall, wherein the housing defines a cavity. The apparatus also includes a developer roller and an ink developer electrode for developing ink to the developer roller. The apparatus also includes an ink outlet, and a gutter for directing ink in the cavity towards the ink outlet, the gutter being disposed between the first wall and second wall, and between the developer roller and base. The gutter has a floor, a first side, and a second side, each extending along a length of the gutter. The floor slopes towards the ink outlet to direct ink towards the ink outlet, and the floor and sides of the gutter form a curve transverse to the length of the gutter to direct ink towards the floor.

公开(公告)号：US20210072668A1

公开(公告)日：2021-03-11

申请号：US16952995

申请日：2020-11-19

申请人： HP INDIGO B.V.

发明人： Peter Nedelin ,  Shai Lior ,  Mark Sandler

IPC分类号： G03G15/11

摘要： An example system includes a conveyor. The conveyor is not a photoconductor. The system also includes a developer unit. The developer unit is to internally concentrate printing liquid. The developer unit also is to deliver the printing liquid to the conveyor. The system includes a wiper in contact with the conveyor. The wiper is to remove the printing liquid from the conveyor.