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    3.
    发明专利
    未知

    公开(公告)号：DE69816917T2

    公开(公告)日：2004-02-12

    申请号：DE69816917

    申请日：1998-06-25

    Applicant: XEROX CORP

    Inventor： LEAN MENG H ,  CASTELLI VITTORIO R ,  DEJONG JOANNES N M ,  WILLIAMS LLOYD A

    IPC: B41J2/01 ,  B41J2/04 ,  B41J2/06 ,  B41J2/095 ,  B41J2/13 ,  B41J11/00 ,  B65H5/00 ,  G01Q80/00 ,  B41J13/08 ,  B41J2/41

    Abstract: A droplet-on-demand ink jet printer uses electrostatic tacking of a recording medium (24), such as paper, to achieve simultaneously precise holding of an aligned recording medium on a dielectric surface of a transport belt (14), thereby providing precise motion quality of the recording medium relative to the printer's printhead (16), and improved ink droplet placement on the recording medium. The transport belt (14) is electrostatically charged with a charge of one polarity, so that an electrostatic pressure is generated which precisely holds the recording medium (24) in an aligned position on the transport belt (14), after it is fed thereon, and concurrently induces a charge of opposite polarity on the ink droplets (38) ejected by the printhead, thereby accelerating the droplets toward the recording medium. The accelerated droplets (38) reduce transverse forces on the droplets, such as transverse airflows, and placement errors caused by the repulsion of incoming droplets by previously printed images are further reduced by migration of the charges of the printed droplets through the recording medium (24) and consequent charge cancellation, so that droplet placement is improved.

    4.
    发明专利
    未知

    公开(公告)号：DE69816917D1

    公开(公告)日：2003-09-11

    申请号：DE69816917

    申请日：1998-06-25

    Applicant: XEROX CORP

    Inventor： LEAN MENG H ,  CASTELLI VITTORIO R ,  DEJONG JOANNES N M ,  WILLIAMS LLOYD A

    IPC: B41J2/01 ,  B41J2/04 ,  B41J2/06 ,  B41J2/095 ,  B41J2/13 ,  B41J11/00 ,  B65H5/00 ,  G01Q80/00 ,  B41J13/08 ,  B41J2/41

    Abstract: A droplet-on-demand ink jet printer uses electrostatic tacking of a recording medium (24), such as paper, to achieve simultaneously precise holding of an aligned recording medium on a dielectric surface of a transport belt (14), thereby providing precise motion quality of the recording medium relative to the printer's printhead (16), and improved ink droplet placement on the recording medium. The transport belt (14) is electrostatically charged with a charge of one polarity, so that an electrostatic pressure is generated which precisely holds the recording medium (24) in an aligned position on the transport belt (14), after it is fed thereon, and concurrently induces a charge of opposite polarity on the ink droplets (38) ejected by the printhead, thereby accelerating the droplets toward the recording medium. The accelerated droplets (38) reduce transverse forces on the droplets, such as transverse airflows, and placement errors caused by the repulsion of incoming droplets by previously printed images are further reduced by migration of the charges of the printed droplets through the recording medium (24) and consequent charge cancellation, so that droplet placement is improved.

    5.
    发明专利
    未知

    公开(公告)号：DE69513557T2

    公开(公告)日：2000-05-04

    申请号：DE69513557

    申请日：1995-04-13

    Applicant: XEROX CORP

    Inventor： BARES JAN ,  CASTELLI VITTORIO R ,  DEJONG JOANNES N M

    IPC: B41J13/26 ,  G03G15/00 ,  G06K15/12 ,  H04N1/053 ,  H04N1/113 ,  H04N1/12 ,  H04N1/50

    Abstract: A method and apparatus is provided for controlling the transverse registration of an image area to be exposed on a longitudinally moving belt (24; Fig.3) by providing belt edge profile data (12), detecting a lateral position of the belt during movement of the belt by measuring the lateral position of the belt edge, and adjusting (22) the traverse location of the image on the belt to compensate for a difference between the detected lateral belt edge position and the belt edge profile data. In addition, a method and apparatus is provided for controlling the lateral position of a longitudinally moving endless belt by generating a steering command signal by calculating a difference between the detected first lateral position of the belt edge and the belt edge profile data corresponding to the first longitudinal position, and adjusting the lateral position of the belt by steering the belt in response to the steering command.

    7.
    发明专利
    未知

    公开(公告)号：DE69924414D1

    公开(公告)日：2005-05-04

    申请号：DE69924414

    申请日：1999-01-07

    Applicant: XEROX CORP

    Inventor： CASTELLI VITTORIO R ,  POLATKAN OSMAN T

    IPC: B65H9/20 ,  B41J11/00 ,  B41J13/26 ,  B65H9/10 ,  G03G15/00 ,  B65H7/06

    Abstract: Two separately programmed pinch rollers (114,116) provided in the paper path conveys a copy sheet (11). A sensor (132) detects the sheet position and output a corresponding signal to a controller. Based on the received signals, the controller generates motor control drive signals for the rollers so as to deskew and register the sheet at registration position. Another sensor (134) is provided in downstream side of paper path at registration position to provide feedback for updating the control signals as pinch rollers wear. The controller deskews and registers the sheet at registration position. An independent claim is included for deskewing and registering method of print sheet.

    8.
    发明专利
    未知

    公开(公告)号：DE69126168T2

    公开(公告)日：1997-11-27

    申请号：DE69126168

    申请日：1991-05-07

    Applicant: XEROX CORP

    Inventor： ZEDEKAR STANLEY L ,  MIRCHANDANI VINOD ,  KLECKNER ROBERT J ,  CASTELLI VITTORIO R ,  JONES KEVIN E

    IPC: F16C33/10 ,  G02B26/12 ,  H04N1/113 ,  G02B26/10

    Abstract: An optical scanner (10) has grease bearings (26) between the rotor (16) and the housing ( 14). The grease bearings are grooved (32) which tends to pump the grease back into the bearing cup (28). The thixotropic property of the grease prevents its escape when the optical scanner is not operating. The grease bearings can be frusto-conical or spherical in shape with a complementary shaped bearing cup. The bearing cup (28), rather than the bearings, may be grooved. The bearing cup may also be stepped (Fig.3) to provide a pumping region and a reservoir region for the grease. Pressure means (88, Fig. 5) on the scanner housing may force the bearing cup onto the grease bearing.

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