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    WEB TRACKING SYSTEM
    3.
    发明专利
    WEB TRACKING SYSTEM 未知

    公开(公告)号：DE3375007D1

    公开(公告)日：1988-02-04

    申请号：DE3375007

    申请日：1983-11-23

    Applicant: XEROX CORP

    Inventor： ST JOHN ROBERT P ,  LLOYD WILLIAM A

    IPC: B65H23/00 ,  B65H23/032 ,  B65H23/18 ,  B65H26/00 ,  B65H23/04

    Abstract: A system for controlling the path of a web of material (18), which is transported from a supply (20) to a takeup means (32) along a predetermined path via one or more processing stations (12, 14, 16), comprises aligned tracking indicia (72, 74, 78) along at least one edge of the web. Means are provided to observe the tracking indicia as the web is transported along the system path and produce signals representing dimensional changes in the length and width of the web due to web shrinkage or expansion, or indicative of a particular point along the length of the web useful at one or more of the processing stations in the system.

    LATERALLY TRANSLATABLE ROLL APPARATUS
    4.
    发明专利
    LATERALLY TRANSLATABLE ROLL APPARATUS 未知

    公开(公告)号：CA1214501A

    公开(公告)日：1986-11-25

    申请号：CA441293

    申请日：1983-11-16

    Applicant: XEROX CORP

    Inventor： WHITAKER ANGUS H ,  MCFARLAND KEITH E ,  LLOYD WILLIAM A ,  PATRICK WILLARD J

    IPC: G03G15/01 ,  H04N1/12 ,  H04N1/193

    Abstract: A laterally translatable roll apparatus supporting a continuous web of material, albeit for supply or take-up, is designed to maintain a roll in proper alignment as the web is paid from or rewound onto the roll. The apparatus comprises a pair of frame members to rotatably support the roll therebetween. A roll drive means has a drive shaft extending to one end of the roll. An interengagable coupler means is provided on both the output end of the roll drive shaft and the one end of the roll to permit the roll to be rotatably driven by the roll drive shaft while not being directly secured thereto. Means is axially mounted at the one end of the roll and biased to move axially outward away from the roll for engagement against the output end of the drive shaft. This axially mounted biased means may comprise a spring loaded plunger mounted in one end of the roll. Lateral translation drive means is mounted on the other of the frame members with translation output means engaging but not secured to the other end of the roll. Circuit means controls the lateral translation drive means to laterally translate the lateral output means which results in lateral translation of the roll without interfering with the rotational operation of the roll via the roll drive means. The lateral translation drive means may comprise a stepper motor mounted on the other frame member with its drive shaft in axial alignment with the rotational axis of the roll to apply translatory motion to the roll via the translation output means. An application for the laterally translatable roll apparatus is lateral translation of a recording medium roll in an electrographic printing or plotter system as the recording medium is paid from or rewound onto a medium roll to properly align the medium for desired aligned movement through one or more stations comprising such a system.

    FILM GHOST REMOVAL IN ELECTROGRAPHIC PLOTTERS BY VOLTAGE BIAS OF THE PLOTTER FOUNTAIN OR FILM EDGE-STRIP
    5.
    发明专利
    FILM GHOST REMOVAL IN ELECTROGRAPHIC PLOTTERS BY VOLTAGE BIAS OF THE PLOTTER FOUNTAIN OR FILM EDGE-STRIP 未知

    公开(公告)号：CA2031232C

    公开(公告)日：1996-01-09

    申请号：CA2031232

    申请日：1990-11-30

    Applicant: XEROX CORP

    Inventor： HANSEN LORIN K ,  GABLE RICHARD J ,  LARA EDWARDO D ,  LLOYD WILLIAM A ,  MCFARLAND KEITH E ,  SAYRE JACK H ,  WHITE STEPHEN D

    IPC: G03G15/00 ,  G03G15/05 ,  H04N1/29 ,  G03G21/00

    Abstract: A preferred embodiment of the present invention is directed to a removal of a ghost image created during a processing of a film laminate medium by an electrographic plotter. A recording of an image on the film medium induces a ghosting potential over a developing station. The ghosting potential causes a spurious image to be developed by the developing station. The recorded image is created by depositing a charge on a dielectric layer of the film. A relationship exists between the deposited charge and the ghosting potential. By use of information known to the system, the ghosting potential may be estimated and reduced. A preferred method estimates the magnitude of the ghosting potential by use of the relationship between deposited charge and ghosting potential. A counteracting potential is applied to the system to reduce the ghosting potential over the developing station. The reduction of the ghosting potential substantially removes the ghost image created during the processing of the film laminate.

    WEB TRACKING SYSTEM
    7.
    发明专利
    WEB TRACKING SYSTEM 未知

    公开(公告)号：CA1235433A

    公开(公告)日：1988-04-19

    申请号：CA441263

    申请日：1983-11-16

    Applicant: XEROX CORP

    Inventor： ST JOHN ROBERT P ,  LLOYD WILLIAM A

    IPC: B65H23/00 ,  B65H23/032 ,  B65H23/18 ,  B65H26/00 ,  B65H20/00

    Abstract: A web tracking system for a continuous web of material which is transported from a supply to a takeup means along a predetermined path via one or more processing stations and comprises aligned tracking indica along at least one edge of the web. Means are provided to observe the tracking indica as the web is transported along the system path and produce information either indicative of dimensional changes in the length and width of the web due to web shrinkage or expansion or indicative of a particular point along the length of the web useful at one or more of the processing stations in the system.

    CAPACITIVE ELECTROSTATIC STYLUS WRITING WITH COUNTER ELECTRODES
    10.
    发明专利
    CAPACITIVE ELECTROSTATIC STYLUS WRITING WITH COUNTER ELECTRODES 未知

    公开(公告)号：CA1189128A

    公开(公告)日：1985-06-18

    申请号：CA389903

    申请日：1981-11-12

    Applicant: XEROX CORP

    Inventor： LLOYD WILLIAM A ,  MACFARLAND KEITH E ,  SMITH KENNETH F

    IPC: G03G15/05 ,  B41J2/39 ,  B41J2/40 ,  G03G15/32 ,  G06K15/14 ,  H04N1/29 ,  H04N1/40 ,  B41J3/16 ,  H04N1/30

    Abstract: A capacitive chargiing mechanism is used in electrostatic stylus recorders having opposed writing nibs and counter electrodes to create electrostatic latent images on electrographic film and other dielectrically coated recording media. To capacitively charge the dielectric surface coating of such a recording medium, a writing voltage is first applied to one or more of the stylii or nibs and another writing voltage pulse is later applied to a counter electrode or electrode segment after a predetermined delay period which is selected to allow the nib voltages to stabilize. The charging of the dielectric surface coating of the recording medium to substantially a predetermined image voltage level occurs on the lead edge of the counter electrode writing voltage pulse. To prevent premature discharge of the charge deposited on the dielectric surface coating the electrode writing voltage pulse is terminated before or simultaneously with the nib writing voltage pulse. Capacitive charging enables such recorders to print on electrographic film and other recording media having insulative substrates, accomodates increased printing rates, and reduces the sensitivity of the printing process to variations in the resistivity of the substrate when applied to recording on electrographic paper

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