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| Number | Title | Issue Date |
| 7787812 | Transfer Di-chorotron (Dicor) cover with constant paper current density A sliding cover of a Di-chorotron includes an electrode connected to an external circuit that simulates the impedance of media on a photoreceptor to maintain constant current density through media on the photoreceptor while blocking transfer current from passing to ... | 08/31/2010 |
| 7532845 | Paper jam-resistant detack corotron for use in an electrostatographic imaging apparatus An improved detack corotron reduces the likelihood of a paper jam arising from a curled paper edge getting caught in the corotron. The detack corotron includes an electrically conductive coronode having a plurality of field emitters, each field emitter having a term... | 05/12/2009 |
| 7315719 | Transfer charge device cover in non-image receiving medium area An image forming apparatus may include: a photoreceptor and a corona charging device or bias transfer roller that provides a charge to an image receiving medium. A cover may be disposed over a portion of the corona charging device or the bias transfer roller to shie... | 01/01/2008 |
| 7260350 | Image forming apparatus There is described an image forming apparatus, which makes it possible to conduct a sufficient discharging operation for a toner image. The apparatus includes an image forming section, an image bearing member, an intermediate transfer belt, a part of which is suppor... | 08/21/2007 |
| 7039214 | Embedding watermark components during separate printing stages The present invention relates to embedding a document with multiple watermark components at different printing stages. A document is preprinted to include a first digital watermark component. The document is then reprinted, perhaps with a lower quality printer, to i... | 05/02/2006 |
| 6980226 | Watermarking method for motion picture image sequence A method is provided for applying a watermark pattern along a length of photosensitive medium, the photosensitive medium having a frame pitch in the length direction that is the sum of an image frame height plus an interframe distance. The method exposes watermark t... | 12/27/2005 |
| 6954605 | Transfer device having casing with elastic member A transfer device includes: a discharge type transfer element for transferring the developer to a sheet by discharging electric charge to a static latent image support through the sheet so as to form an image of an original thereon; and a transfer casing accommodati... | 10/11/2005 |
| 6928250 | Closed loop control function for corona device An electrophotographic printing machine of the type having a latent image recorded on an imaging member wherein said latent image is developed and transferred to a media substrate during successive printing cycles of successive print jobs, including a charging devic... | 08/09/2005 |
| 6792235 | Electrophotographic apparatus including transferring device A transfer flow-in current which flows from a transferring device into an image carrier, a separation flow-in current which flows from a separating device into the image carrier, an aperture width in the recording member transporting direction of an aperture of the ... | 09/14/2004 |
| 6618571 | Process and device for transferring toner Toner material is transferred from a locally charged imaging member to a printed material with a d.c. voltage applied onto an a.c. voltage having voltage peaks in the range of 6-8 kV with a duration of 0.5-1.5 μsec combined with it.... | 09/09/2003 |
| 6487386 | Device for applying decors and/or characters on glass, glass ceramics and ceramics products The device for applying decorations and characters on glass, glass ceramic or ceramic products includes an image roller (5) provided with an electrostatically chargeable photoconductive layer; a photo-exposure assembly (6) for generating an electrostatic ... | 11/26/2002 |
| 6438333 | Image forming apparatus with reduced transfer current to transfer material rear end Disclosed is an image forming apparatus which applies a curl to a transfer material to prevent the transfer material from winding around an image bearer. The apparatus comprises control means that reduces the transfer current to the rear end portion of th... | 08/20/2002 |
| 6411794 | Discharge device and image forming apparatus A discharge device has a discharge wire for discharge in response to a voltage, a supporting block for supporting the discharge wire, an electric contact receiving an AC voltage, and a resistor element placed between the discharge wire and the electric co... | 06/25/2002 |
| 6366753 | Charger wire tensioning mounting mechanism and method of using A support and tensioning device for an elongated corona generating electrode includes a corona charger shield member that includes a first set of wall members for serving as a shield for a corona generating electrode. The shield member includes a second s... | 04/02/2002 |
| 6330418 | Segmented transfer blade using a rotating decision stop A device and method of enhancing contact between a photoconductive member of a electrophotographic printing machine and the paper to which an electrostatic latent image is to be transferred uses an array of wiper blade segments mounted on a common shaft. ... | 12/11/2001 |
| 6314265 | Transfer printing station for an electrographic device with a contact pressure element in the transfer printing area A printer or copier has a transfer printing station for electrostatic transfer of toner from a photoconductor to the recording medium. A pressure contact element is provided on the recording medium guide elements to ensure contact of the recording medium ... | 11/06/2001 |
| 6308020 | Printer and transfer charger A printer including a photosensitive drum on which a toner image is formed, a plurality of transfer wires held in facing relation to the drum, and a static-eliminating wire located downstream from the transfer wires. Transfer currents are conducted throug... | 10/23/2001 |
| 6298204 | Corona Charger with integral latch member for locating the charger relative to a roller A corona charger and integral latch member device includes a corona charger having a longitudinally ending wall and a corona generating electrode extending generally parallel with the longitudinally extending wall and spaced a predetermined distance there... | 10/02/2001 |
| 6108510 | Tandem-type image forming apparatus having full-color print mode and single-color print mode A color image forming apparatus having a plurality of image forming units, a first attraction unit and a second attraction unit for attracting a recording sheet to a transport belt, and a controller for operating the first attraction unit when a first mod... | 08/22/2000 |
| 6070024 | Image forming apparatus A copier includes a transfer charger for electrostatically transferring a toner image which is formed on a surface of a photoelectric drum to a sheet and a separation charger for separating the sheet with a toner image transferred thereto from the drum su... | 05/30/2000 |
| 6055395 | Transfer apparatus Shield members 9b-1 and 9b-2 constituting a transfer unit 9 for a transfer apparatus are inserted from the bottom of a transfer holder 40 fabricated by integrating a pre-transfer guide 31 and a post-transfer guide 34 together with wire fixing portions 41a... | 04/25/2000 |
| 6021301 | Image forming apparatus which is equipped with an intermediate transfer body and which prevents toner from sticking to a transfer unit An image forming apparatus includes: an image forming body; an intermediate transfer body for carrying a toner image transferred from the image forming body and conveying a transfer material thereon; a first transfer device for transferring the toner imag... | 02/01/2000 |
| 5995796 | Haloelastomer and doped metal oxide film component A film component having a) a haloelastomer with halogenated monomers, polyorganosiloxane monomers, or both halogenated and polyorganosiloxane monomers, and b) a doped metal oxide, preferably antimony doped tin oxide, dispersed therein, wherein the film co... | 11/30/1999 |
| 5987299 | Electrographic printer with adjustable corona device An electrographic printer with a printing unit that comprises a photoconductor provided with a toner image during the printing process and which further comprises a corona device arranged at a distance from the photoconductor that generates an electrical ... | 11/16/1999 |
| 5890030 | Electrostatic image forming apparatus In an electrostatic image forming apparatus, including a corona discharger located so as to face an image carrier on which a toner image is to be formed. When a paper or similar recording medium is brought between the image carrier and the discharger, the... | 03/30/1999 |
| 5781829 | Low noise charging system A method and apparatus for achieving optimum noise control of multiple coronode wires in a copier/printer involves optimizing phase relationships of the voltage on the wires in such a way so as to steer the maximum part of the noise distribution profile i... | 07/14/1998 |
| 5602633 | Image forming apparatus with low ozone generation and improved image quality A color printer includes a conveyer belt for conveying a paper sheet to make the sheet pass through a plurality of photoconductive drums. A suction roller for sucking a supplied paper sheet on the conveyer belt is provided on the upstream side of the phot... | 02/11/1997 |
| 5585908 | Image forming apparatus usable with variable width receivers A toner image is transferred from an image member to a receiving sheet using a backing member or corona charger to which a constant current source is applied for creation of a transfer electrical field. A logic and control receives an input indicative of ... | 12/17/1996 |
| 5574540 | Dual use charging devices Charging devices which are used for charging and transfer and for charging and pretransfer in color electrophotographic printing. A charging device is used for charging a photoreceptor in preparation for exposure and also for pretransfer charging of a com... | 11/12/1996 |
| 5568238 | Transfer assist apparatus having a conductive blade member An apparatus which transfers a developed image from a photoconductive surface to a copy sheet. The apparatus includes a corona generating device arranged to charge the copy sheet for establishing a transfer field that is effective to attract the developed... | 10/22/1996 |
| 5546172 | Transfer omission detector in tranfer unit for image forming apparatus When a transfer is to be performed, a setting device sets a transfer voltage value VTC, which is that at which optimum transfer is obtained, as well as a transfer assuring voltage value VAC which assures transfer. A constant-current source performs consta... | 08/13/1996 |
| 5521680 | Printer having a self-aligning charging device An automatically self-aligning charging device assembly for producing a layer of charge on a charge holding surface in alignment with a document registration position on the platen of a machine. The assembly includes a charging element having a start-of-c... | 05/28/1996 |
| 5465135 | Charger control in an electrophotographic copying apparatus An electrophotographic copying apparatus including a time counter to count a time during which transfer sheets are left in a stacker; a memory to store an output value of a humidity detector; a calculator to calculate a correction value for each transfer ... | 11/07/1995 |
| 5361125 | Intermediate transfer member An apparatus for enabling a conductive backed photoconductive intermediate transfer member in an electrophotographic printing apparatus with pre-charge and light assist. The printing apparatus includes a toner transfer system having an intermediate transf... | 11/01/1994 |
| 5243392 | Imaging apparatus and process with intermediate transfer element An imaging apparatus comprises an imaging member, a means for generating an electrostatic latent image on the imaging member, a means for developing the latent image, an intermediate transfer element having a charge relaxation time from about 3×10-1... | 09/07/1993 |
| 5220396 | Sheet separating mechanism In an electrophotographic printer using a continuous-form sheet as a recording medium, there is provided a sheet separating mechanism comprising an elastic member arranged to be deformed by the continuous-form sheet, that is pressed by a transferring char... | 06/15/1993 |
| 5140376 | Transfer and conveying apparatus The transfer and conveying apparatus of the invention transfers a toner image from a photoreceptor onto a recording paper by performing corona discharge at a location opposite to the photoreceptor and adjacent to a portion of a conveying belt which contac... | 08/18/1992 |
| 5101239 | Transfer device for electrophotographic printer In an electrophotographic printer, a toner image formed on a photoconductive member is transferred onto a recording medium by charging the recording medium and by making the charged recording medium contact the toner image formed on the photoconductive me... | 03/31/1992 |
| 4947214 | Transfer apparatus An apparatus which transfers a developed image from a photoconductive surface to a copy sheet. The apparatus includes a corona generating device arranged to charge the copy sheet. This establishes a transfer field that is effective to attract the develope... | 08/07/1990 |
| 4901110 | Vertical print engine for electrophotographic apparatus An electrophotographic print engine with a photosensitive flexible belt stretched over a plurality of rollers in a compact electrophotographic printer such that a developing position on the belt is disposed in a vertical plane, the developing position exp... | 02/13/1990 |
