Supplemental Electrophotographic Process Patents (Class 399/127)
  • Patent number: 10469687
    Abstract: A printing control apparatus includes a conveying unit that conveys a document to a reading unit, a detection unit that detects a size of the document before it begins to be conveyed, a detection unit that detects the size of the document after the document begins to be conveyed, and a control unit that performs a copy job using the reading unit and printing unit based on the size of the document detected before it is conveyed in a case where the printing unit starts to print the image data before the reading unit finishes generating image data for one page and performs a copy job based on the size of the document detected after it begins to be conveyed in a case where the printing unit starts to print the image data after the reading unit finishes generating image data for at least one page.
    Type: Grant
    Filed: May 4, 2018
    Date of Patent: November 5, 2019
    Assignee: Canon Kabushiki Kaisha
    Inventor: Tomoaki Osada
  • Patent number: 10146170
    Abstract: An image forming apparatus includes an image carrier, an electrification device, an exposing device, developing device, and a control unit. The developing device includes a developing roller for supplying toner to the image carrier, a developing container for storing developer containing the toner, and a seal member for preventing leakage of the toner from a gap between the image carrier and the developing container. The control unit is capable of executing a seal member cleaning mode, in which it forms an electrostatic latent image pattern having exposed parts and unexposed parts whose boundaries exist at a predetermined or less interval over the entire area in a width direction of an image forming area of the image carrier when an image is not being formed, and drives the image carrier to rotate so that the electrostatic latent image pattern passes the seal member.
    Type: Grant
    Filed: October 6, 2017
    Date of Patent: December 4, 2018
    Assignee: KYOCERA Document Solutions Inc.
    Inventor: Yasuhiro Tauchi
  • Patent number: 9992366
    Abstract: A printing control apparatus includes a conveying unit that conveys a document to a reading unit, a detection unit that detects a size of the document before it begins to be conveyed, a detection unit that detects the size of the document after the document begins to be conveyed, and a control unit that performs a copy job using the reading unit and printing unit based on the size of the document detected before it is conveyed in a case where the printing unit starts to print the image data before the reading unit finishes generating image data for one page and performs a copy job based on the size of the document detected after it begins to be conveyed in a case where the printing unit starts to print the image data after the reading unit finishes generating image data for at least one page.
    Type: Grant
    Filed: December 9, 2015
    Date of Patent: June 5, 2018
    Assignee: Canon Kabushiki Kaisha
    Inventor: Tomoaki Osada
  • Patent number: 9882746
    Abstract: This disclosure generally provides a processing system that includes a first controller coupled with a second controller via a first communication link. The first controller is configured to transmit display data and configuration data to the second controller via the first communication link. The second controller is configured to drive, using the display data, one or more coupled display electrodes for performing display updating. The second controller is further configured to operate one or more coupled sensor electrodes using the configuration data to acquire capacitive sensing data, and to transmit the capacitive sensing data to the first controller via the first communication link.
    Type: Grant
    Filed: December 29, 2015
    Date of Patent: January 30, 2018
    Assignee: SYNAPTICS INCORPORATED
    Inventors: Jeffrey Lukanc, Shriram Kulkarni, Stephen L. Morein
  • Patent number: 9395687
    Abstract: An electrophotographic apparatus includes an electrophotographic photosensitive member, a charging unit, and a transfer unit and satisfies the following formulae (1) to (3): L1<L3??(1) L1>L2??(2) L1>L4??(3) where L1 represents a range from the center of an image-forming region of the electrophotographic photosensitive member to an end of a charged region in a longitudinal direction of the electrophotographic photosensitive member, L2 represents a range from the center of the image-forming region to an end of a transfer region in the longitudinal direction, L3 represents a range from the center of the image-forming region to an end of a region where the surface layer is placed in the longitudinal direction, and L4 represents a range from the center of the image-forming region to an end of a region where the charge-generating layer is placed in the longitudinal direction.
    Type: Grant
    Filed: August 21, 2015
    Date of Patent: July 19, 2016
    Assignee: Canon Kabushiki Kaisha
    Inventors: Hiroyuki Tomono, Yota Ito, Daisuke Miura, Takashi Anezaki, Harunobu Ogaki
  • Patent number: 9335680
    Abstract: An image forming apparatus includes: a first image forming unit which forms a first image on a first recording medium with a first material that is not thermally decolorizable; a second image forming unit which forms a second image on a second recording medium with a second material that is thermally decolorizable; a fixing device which is on a common carrying path shared by the first recording medium and the second recording medium and fixes the first image to the first recording medium; and a controller which controls the fixing device so that a temperature of the fixing device is lower than a decolorizing temperature of the second material when the second recording medium reaches the fixing device.
    Type: Grant
    Filed: December 23, 2014
    Date of Patent: May 10, 2016
    Assignees: Kabushiki Kaisha Toshiba, Toshiba TEC Kabushiki Kaisha
    Inventors: Yoshiaki Kaneko, Minoru Yoshida, Osamu Takagi, Takahito Kabai, Hiroyuki Taguchi, Ken Iguchi
  • Patent number: 8977181
    Abstract: According to an embodiment, an image forming apparatus includes an image forming unit, an image erasing unit, and a control unit. The image forming unit performs an image forming process of forming an image on an image bearing body by a toner and transferring the toner image from the image bearing body onto a recording medium, and a refresh process of forming an image on the image bearing body by a toner and removing the toner image from the image bearing body. The control unit controls the image forming unit such that the image forming unit performs the refresh process together with the erasing process performed by the erasing unit.
    Type: Grant
    Filed: November 11, 2013
    Date of Patent: March 10, 2015
    Assignees: Kabushiki Kaisha Toshiba, Toshiba Tec Kabushiki Kaisha
    Inventor: Eiji Shinohara
  • Patent number: 8855532
    Abstract: According to one embodiment, the image forming apparatus includes an image carrier the surface of which is charged at a predetermined potential, an exposure device which forms a latent image by exposing the surface of the image carrier, a developing unit which develops a toner image generated using color erasable toner on the latent image formed on the surface of the image carrier, a transfer unit which transfers the toner image to a recording medium, and a controller which controls an operation for transferring a toner image of the color erasable toner to a printed surface of the recording medium to cover a printed portion of the recording medium to which the color erasable toner has been fixed.
    Type: Grant
    Filed: September 1, 2011
    Date of Patent: October 7, 2014
    Assignees: Kabushiki Kaisha Toshiba, Toshiba Tec Kabushiki Kaisha
    Inventor: Chie Tonohiro
  • Patent number: 8824928
    Abstract: A charging apparatus includes a latent image bearing member having a charge generating layer for generating an electric charge by receiving light energy; a light source for emitting light energy for generating the electric charge in the charge generating layer; an electrode; a bias voltage applying portion for applying a bias voltage to the electrode; and an elastic member, which is insulative and transparent, for contacting the electrode to a surface of the latent image bearing member. The electric charge is generated in the charge generating layer by reception of the light energy emitted from the light source, and the surface of the latent image bearing member is electrically charged by applying the bias voltage from the bias voltage applying portion to the electrode. The electrode is provided on the elastic member and is contacted to the surface of the latent image bearing member in a contact area and does not extend to an outside of the contact area.
    Type: Grant
    Filed: August 16, 2011
    Date of Patent: September 2, 2014
    Assignee: Canon Kabushiki Kaisha
    Inventor: Takeshi Kawamura
  • Patent number: 8717583
    Abstract: A printing apparatus which is capable of appropriately discharging extra tab sheets, without placing the burden of removing the extra tab sheets on a user even in the case of attaching tab sheets into sheets to be subjected to reverse-order printing. An MFP controller determines a number of tab sheets to be attached to one copy of the printout of a print job. After causing discharge of extra tab sheets corresponding in number to a difference between the determined number and a number of tab sheets forming one set are discharged, the MFP causes the printout of the print job to be discharged starting with an N-th sheet.
    Type: Grant
    Filed: April 2, 2009
    Date of Patent: May 6, 2014
    Assignee: Canon Kabushiki Kaisha
    Inventor: Hiroya Igarashi
  • Patent number: 8655228
    Abstract: An image forming apparatus includes detecting means for detecting a temperature of a recording material on which a non-transparent toner image is heat-fixed; transparent image forming means for effecting image formation by transparent toner on the basis of transparent image data; a heating device for heating the transparent toner image formed by the transparent image forming means; and correcting means for correcting an amount, per unit area, of the transparent toner which is deposited on the non-transparent toner image fixed on the recording material, by the transparent image forming means in accordance with a temperature detected by the detecting means.
    Type: Grant
    Filed: August 24, 2011
    Date of Patent: February 18, 2014
    Assignee: Canon Kabushiki Kaisha
    Inventor: Asuna Fukamachi
  • Patent number: 8600265
    Abstract: An image forming apparatus includes a photosensitive member; a charging device for electrically charging the photosensitive member; an exposure device for exposing to light the photosensitive member charged by the charging device to form an electrostatic image on the photosensitive member; a developing device for developing the electrostatic image on the photosensitive member with toner to form a toner image; a transfer portion for transferring the toner image from the photosensitive member onto an image receiving member; a toner charging portion, disposed upstream of the charging device and downstream of the transfer portion with respect to a rotational direction of the photosensitive member, for electrically charging the toner remaining on the photosensitive member without being transferred onto the image receiving member; and control portion for controlling the charging device and the exposure device so that a stripe-shaped electrostatic image is repeatedly formed in substantially parallel to a longitudina
    Type: Grant
    Filed: November 15, 2010
    Date of Patent: December 3, 2013
    Assignee: Canon Kabushiki Kaisha
    Inventors: Jiro Kinokuni, Michihiro Yoshida
  • Publication number: 20130162703
    Abstract: A method of printing an image on a receiver includes receiving image data for the image. A processor automatically produces data for a polymer pattern and a salt pattern using the image data. A polymer is deposited on the receiver according to the polymer pattern using a polymer-deposition unit. A salt is deposited on the receiver according to the salt pattern using a salt-deposition unit different from the polymer-deposition unit. Liquid ink is deposited on the receiver according to the image data using an inkjet print engine, and at least some of the ink is deposited over the deposited polymer or the deposited salt.
    Type: Application
    Filed: December 21, 2011
    Publication date: June 27, 2013
    Inventor: Thomas Nathaniel Tombs
  • Publication number: 20130108322
    Abstract: A process unit is capable of avoiding backset of residual toner from the collecting unit to an image carrier even after collection of the residual toner on the image carrier at the collecting unit. A first collecting member is positioned downstream of a transfer unit and upstream of a charger in rotational direction of an image carrier. The first collecting member is configured to allow a developing agent remaining on the image carrier to pass therethrough but to collect a paper dust on the image carrier. A second collecting member is positioned downstream of the first collecting member and upstream of the charger, and configured to allow a developing agent remaining on the image carrier to pass therethrough but to collect a paper dust on the image carrier. The control device controls the first collecting member to be applied with a polarity the same as that of the charger.
    Type: Application
    Filed: September 24, 2012
    Publication date: May 2, 2013
    Inventor: Takahiro Nishimoto
  • Patent number: 8374532
    Abstract: An image forming apparatus including a latent image bearing member, a charger, an irradiator, a developing member, a transfer device, and a surface potential equalizer. The transfer device includes an intermediate transfer member comprising a high-resistivity body having a surface resistivity of 1013?/? or more under dark conditions, a primary transfer member that transfers the toner image from the latent image bearing member onto the intermediate transfer member at a primary transfer nip, and a secondary transfer member that transfers the toner image from the intermediate transfer member onto a recording medium at a secondary transfer nip. The surface potential equalizer includes a surface potential equalizing member that equalizes a surface potential of the intermediate transfer member at a predetermined positive or negative potential. The surface potential equalizer is provided on a migration path of the intermediate transfer member from the secondary transfer nip to the primary transfer nip.
    Type: Grant
    Filed: July 6, 2010
    Date of Patent: February 12, 2013
    Assignee: Ricoh Company, Limited
    Inventors: Makoto Matsushita, Akira Izutani
  • Patent number: 8346110
    Abstract: The image forming apparatus includes a photosensitive drum capable of bearing an electrostatic image, a development device having a developing sleeve capable of bearing a developer and a developer container capable of storing a magnetic toner, and a CPU controlling operation to discharge a developer having polarity opposite to a normally charged polarity to the photosensitive drum by enlarging a restoration electric field to force the developer having a normally charged polarity from the photosensitive drum to the development sleeve during image forming is not performed compared to that during normal image forming is performed, based on a weighted value (p×K) on an edge portion pixel number p of an edge portion of an output image.
    Type: Grant
    Filed: August 19, 2010
    Date of Patent: January 1, 2013
    Assignee: Canon Kabushiki Kaisha
    Inventor: Osamu Ariizumi
  • Publication number: 20120237698
    Abstract: A method of manufacturing transfer sheet is provided. The method includes forming a colored toner image on a sheet-like base material based on objective image data. The sheet-like base material has releasability. The method further includes defining an image area on the sheet-like base material based on the objective image data. The image area includes the colored toner image. The method further includes forming a transparent toner layer on the image area. The method further includes forming an adhesive layer on the transparent toner layer. The adhesive layer has hot-melt property.
    Type: Application
    Filed: March 9, 2012
    Publication date: September 20, 2012
    Applicant: RICOH COMPANY, LTD.
    Inventors: Kazuki Funahashi, Kei Yasutomi, Takuroh Sone
  • Publication number: 20110170908
    Abstract: A lubricant applying unit that applies lubricant to a photosensitive element includes solid lubricant blended with fatty acid metal salt, a lubricant supplying brush roller, a lubricant applying blade, and a biasing unit of the solid lubricant. In addition, a lubricant applying unit that applies lubricant to an intermediate transfer belt includes solid lubricant blended with inorganic lubricant, a lubricant supplying brush roller, a lubricant applying blade, and a biasing unit of the solid lubricant blended with the inorganic lubricant.
    Type: Application
    Filed: December 14, 2010
    Publication date: July 14, 2011
    Applicant: Ricoh Company, Limited
    Inventors: Hiroshi Saitoh, Takaaki Tawada, Akira Fujimori
  • Publication number: 20110008069
    Abstract: An image forming apparatus including a latent image bearing member, a charger, an irradiator, a developing member, a transfer device, and a surface potential equalizer. The transfer device includes an intermediate transfer member comprising a high-resistivity body having a surface resistivity of 1013?/? or more under dark conditions, a primary transfer member that transfers the toner image from the latent image bearing member onto the intermediate transfer member at a primary transfer nip, and a secondary transfer member that transfers the toner image from the intermediate transfer member onto a recording medium at a secondary transfer nip. The surface potential equalizer includes a surface potential equalizing member that equalizes a surface potential of the intermediate transfer member at a predetermined positive or negative potential. The surface potential equalizer is provided on a migration path of the intermediate transfer member from the secondary transfer nip to the primary transfer nip.
    Type: Application
    Filed: July 6, 2010
    Publication date: January 13, 2011
    Inventors: Makoto MATSUSHITA, Akira Izutani
  • Publication number: 20100316398
    Abstract: An image-forming device includes a media path extending through the image-forming device, and at least one image transfer nip positioned along the media path. An electrode is positioned subsequent to the nip with respect to the media path and is coupled to a voltage source. An electric field produced by the electrode and voltage source limits the degree of post-nip toner scattering by applying an electrostatic force to toner particles on media sheets passing along the media path. The image-forming device further includes a processor for monitoring a plurality of ambient conditions, for adjusting the voltage applied to the electrode, and optionally, for repositioning the electrode with respect to the media path.
    Type: Application
    Filed: June 16, 2009
    Publication date: December 16, 2010
    Inventors: Richard Gordon Boyatt, III, Alexander Johannes Geyling, Brandon Alden Kemp, Niko Murrell, Gregory Lawrence Ream
  • Patent number: 7835652
    Abstract: An image developing method is disclosed that is able to efficiently remove degraded toner on a developing agent carrier, prevent formation of abnormal images, ensure good image quality over time, and increase the service life of the device. The developing method includes a step of calculating an amount of consumption of the developing agent during image formation and an amount of consumption of the developing agent in a compulsory toner consumption mode under different calculation conditions between the image formation and the compulsory toner consumption mode. In the compulsory toner consumption mode, a developing bias different from a developing bias used during image formation is applied for a predetermined time period to discharge residual developing agent on a developing agent carrier to a latent image carrier.
    Type: Grant
    Filed: April 28, 2008
    Date of Patent: November 16, 2010
    Assignee: Ricoh Company, Ltd.
    Inventors: Rumi Konishi, Shuuichi Nakagawa, Ryuji Inoue, Shin Murayama, Kazushige Oonishi, Shintaro Yamada
  • Patent number: 7820272
    Abstract: An image transfer sheet for electrophotography comprising a substrate and an image receiving layer provided on at least one side of the substrate, wherein the image receiving layer includes particles having a volume average particle diameter which is greater than a thickness of the image receiving layer, and both surfaces of the image transfer sheet have surface resistivities at 23° C. 55% r.h. which are within the range of 1.0×108 to 1.0×1013?. Also provided are an image recorded medium and a method for manufacturing the image recorded medium which use the image transfer sheet for electrophotography.
    Type: Grant
    Filed: June 29, 2005
    Date of Patent: October 26, 2010
    Assignee: Fuji Xerox Co., Ltd.
    Inventors: Kaoru Torikoshi, Tomoo Kobayashi, Kunio Sakurai, Naoyuki Egusa, Tetsuro Kodera
  • Patent number: 7664430
    Abstract: An image forming apparatus includes an image carrier that rotates in a predetermined direction so as to carry a toner image, a charging member that charges the image carrier by a discharge operation, a toner holding member that is disposed to be in contact with the image carrier so as to hold toner in a portion being in contact with the image carrier and that removes a discharge product generated on the image carrier, and a holding amount adjusting unit that adjusts a toner holding amount of the toner holding member. The holding amount adjusting unit includes an estimation unit that estimates a current toner holding amount of the toner holding member, and a correction unit that corrects the toner holding amount of the toner holding member on a basis of an estimation result obtained from the estimation unit.
    Type: Grant
    Filed: April 13, 2006
    Date of Patent: February 16, 2010
    Assignee: Fuji Xerox Co., Ltd.
    Inventors: Takayuki Yamashita, Yutaka Kiuchi
  • Patent number: 7653329
    Abstract: An image forming device includes a motor, a photoconductive drum, a charging unit, an abrasion tool, a timer, and a controller. The charging unit is provided at a periphery of the photoconductive drum, and charges the photoconductive drum by a corona discharge method. The abrasion tool is provided at the periphery of the photoconductive drum, and abrades the surface of the photoconductive drum while the photoconductive drum is rotating. The timer measures a job interval from when the motor is stopped to end a previous print job until when the motor is driven to start a next print job. The controller executes over a predetermined period of time a pre-rotation process to adjust the photoconductive drum and a peripheral system of the photoconductive drum into an optimum state, and calculates a period when the pre-rotation process is to be executed according to the measured job interval.
    Type: Grant
    Filed: July 17, 2006
    Date of Patent: January 26, 2010
    Assignee: Murata Machinery, Ltd.
    Inventor: Takahiro Sasai
  • Patent number: 7596331
    Abstract: An image forming apparatus includes an auxiliary charging member contacting an image bearing member and for being supplied with a bias of an identical polarity to a normal charge polarity of toner at a position downstream from a transfer portion where a transfer member is located and upstream from a charging portion where a charging member is located with respect to a rotation direction of the image bearing member. When rotation of the image bearing member is stopped and then resumed, application of a toner transfer bias to the transfer member is started before a contact position between the image bearing member and the auxiliary charging member during the rotation stop of the image bearing member first reaches the transfer portion.
    Type: Grant
    Filed: June 6, 2007
    Date of Patent: September 29, 2009
    Assignee: Canon Kabushiki Kaisha
    Inventor: Jiro Kinokuni
  • Patent number: 7471918
    Abstract: The present invention provides an image forming apparatus which can, by uniformly leveling the particles which are non-uniformly adhered to the surface of the photoconductor by using a leveling means having a predetermined shape, and can maintain the excellent image characteristics for a long period even when a contact charging method is adopted as a charging means and an image forming method which uses the image forming apparatus. In an image forming apparatus which sequentially arranges a charging means, a developing means, a transferring means and a charge eliminating means around an electrophotographic photoconductor, the charging means is constituted of a contact-type charging means, and a leveling means which levels particles on a surface of the electrophotographic photoconductor is arranged between the transferring means and the charge eliminating means.
    Type: Grant
    Filed: October 18, 2006
    Date of Patent: December 30, 2008
    Assignee: Kyocera Mita Corporation
    Inventors: Makoto Shishido, Shiho Okawa
  • Publication number: 20080241767
    Abstract: A device as well as method for deactivating without developing an exposed lithographic printing plate is disclosed. The device comprises a structure for providing a deactivating agent that is capable of deactivating without developing the plate. The plate comprises on a substrate a photosensitive layer capable of hardening upon exposure to a radiation, and becoming incapable of or having reduced rate of hardening after contacting with a deactivating agent. The deactivated plate is safe or has better stability at room lighting, and can be handled under room lighting before and during development. The development can be on press with ink and/or fountain solution or off press with a liquid developer.
    Type: Application
    Filed: March 26, 2007
    Publication date: October 2, 2008
    Inventor: Gary Ganghui Teng
  • Patent number: 7292806
    Abstract: Prior to the execution of a printing operation, a print preparatory operation is conducted only on a priority developer cartridge out of the plurality of monochromatic developer cartridges mounted to the developing unit thereby bringing the cartridge into a printable state. Therefore, the print preparatory operation is completed when the print preparatory operation on one (equivalent to a “priority cartridge” of the invention) of the developer cartridges mounted to the developing unit is terminated. Hence, the apparatus may be placed in the printable state in a short time so that the print preparatory operation is prevented from compelling a user to wait needlessly long and that waiting time of a user may be shortened.
    Type: Grant
    Filed: February 25, 2005
    Date of Patent: November 6, 2007
    Assignee: Seiko Epson Corporation
    Inventors: Keiichi Taguchi, Ken Yoshizuka, Osamu Ishibashi
  • Patent number: 7289750
    Abstract: The apparatus is brought into a printable state by selecting one print preparatory process from first and second print preparatory processes and conducting the selected print preparatory process prior to the execution of the printing operation. That is, the printing operation by means of the cartridge is enabled by conducting a print preparatory process desired by a user. Specifically, the print preparatory process is selected and conducted according to the user's desire (to produce a large volume of prints, to reduce the length of time required to become printable, or such). Therefore, the monochromatic printing in the above specific color can be efficiently performed in a manner conforming to the user's desire.
    Type: Grant
    Filed: February 25, 2005
    Date of Patent: October 30, 2007
    Assignee: Seiko Epson Corporation
    Inventors: Keiichi Taguchi, Ken Ikuma
  • Publication number: 20070196118
    Abstract: An image formation apparatus includes an imaging light source, a photosensitive body and a correction light source. The imaging light source outputs light modulated in accordance with image data representing an image. An electrostatic latent image is formed at the photosensitive body by the light output from the imaging light source. The correction light source is provided separately from the imaging light source, and outputs light toward the photosensitive body for correcting one of variations in potential on the photosensitive body and irregularities in density distribution of an image, which image is to be formed in accordance with the electrostatic latent image that is formed on the photosensitive body by the imaging light source.
    Type: Application
    Filed: July 28, 2006
    Publication date: August 23, 2007
    Inventors: Matsuyuki Aoki, Satoshi Tanaka, Akira Ishii, Hiroshi Ono, Hideki Kashimura, Kohei Shioya
  • Patent number: 7218879
    Abstract: An image forming apparatus includes an image carrier, a charging device configured to uniformly charge a surface of the image carrier with a charging member applied with a bias of a first polarity (e.g. a negative polarity) for charging. A latent image forming device forms a latent image on the surface of the image carrier uniformly charged. A developing device develops a latent image by depositing toner grains of the first polarity on the latent image to thereby form a corresponding toner image. A transferring device forms an electric field between the image carrier and a moving member that serves as a movable contact with the image carrier to thereby transfer the toner image from the surface of the image carrier to the moving member or to a recording member nipped between the image carrier and the moving member. A polarity controlling device sets residual toner to a second polarity (e.g.
    Type: Grant
    Filed: December 3, 2004
    Date of Patent: May 15, 2007
    Assignee: Ricoh Company, Ltd.
    Inventors: Shigekazu Enoki, Koji Suzuki, Yasushi Koichi, Osamu Ariizumi, Kumiko Hatakeyama, Koichi Kato, Masahide Yamashita, Toshiyuki Kabata, Jun Yura
  • Patent number: 7177568
    Abstract: Prior to execution of a printing operation, a print preparatory operation is conducted collectively on all developer cartridges mounted to a developing unit, thereby bringing all the developer cartridges into a printable state. Therefore, even if a residual amount of toner in the cartridge runs too low to continue the printing operation performed using one of plural cartridges mounted to the developing unit, the printing operation is allowed to continue by switching the cartridge to the next cartridge. Hence, a large volume of monochromatic prints may be produced in an efficient manner.
    Type: Grant
    Filed: February 28, 2005
    Date of Patent: February 13, 2007
    Assignee: Seiko Epson Corporation
    Inventors: Keiichi Taguchi, Ken Yoshizuka, Osamu Ishibashi
  • Patent number: 7068957
    Abstract: Optimization of a density control factor accompanying formation of a patch image is executed every time a predetermined period of time elapses since the end of a preceding image forming operation. Since an image is formed at regular intervals in this manner, it is possible to suppress a density variation which is created as toner carried on a developer roller is left unused for long. This effect further improves when the developer roller is rotated idle prior to formation of a patch image or regularly at predetermined timing.
    Type: Grant
    Filed: July 18, 2003
    Date of Patent: June 27, 2006
    Assignee: Seiko Epson Corporation
    Inventors: Hidetsugu Shimura, Takashi Hama
  • Patent number: 6954603
    Abstract: In order to prevent an imaging forming process of an electrostatographic reproduction apparatus from becoming contaminated with fuser release oil, a substantially uniform layer of pigmented marking particles from a development subsystem of the image forming process is deposited onto a photoconductive member of the image forming process during any non-imaging cycles of the process, including cycle down, non-imaging skip frames, or recovery from a receiver jam. The substantially uniform layer of pigmented marking particles acts as a barrier to block fuser release oil from the photoconductive member and as a vehicle to carry away contaminating fuser release oil.
    Type: Grant
    Filed: September 22, 2003
    Date of Patent: October 11, 2005
    Assignee: Eastman Kodak Company
    Inventors: Kenneth J. Brown, Amy J. Deyaeger, David E. Hockey, Thomas N. Tombs, Diane M. Herrick, David M. Rakov
  • Patent number: 6904262
    Abstract: The invention provides a double-faced image formation system that prevents transfer and adhesion of a lubricant to an image retaining conveyer and an intermediate transfer part. The system is provided with, on a return path for reversing and conveying a sheet having toner images fixed on one side thereof, a front face electrifying unit and a rear face electrifying unit. Oil adhered on the rear face of the sheet in a fixation unit by the rear face electrifying unit is electrified to a negative polarity, and the oil adhered on the rear face is made impossible to transfer to an intermediate transfer belt. The oil adhered on the front face of the sheet in the fixation unit by the front face electrifying unit is electrified to a positive polarity, and the oil adhered on the front face is made impossible to transfer to a secondary transfer conveyance belt.
    Type: Grant
    Filed: October 21, 2003
    Date of Patent: June 7, 2005
    Assignee: Fuji Xerox Co., Ltd.
    Inventors: Masaaki Takahashi, Keiji Yamamoto, Satoru Torimaru, Katsunori Kikuchihara, Yoko Miyamoto, Kiyotoshi Kaneyama, Satoshi Matsuzaka, Takashi Kawabata
  • Patent number: 6868240
    Abstract: To avoid developing ghost and selective developing without complicating a developing apparatus and to supply surly charged toner to a developing roll while unevenness of images is not generated to obtain stable images for a long time even when continuous printing, a method for developing in a hybrid developing apparatus is provided, which is characterized in that a data amount of each image, which an image forming apparatus prints and a number of paper sheets passed are detected and that an interval of the action of recovering and exchanging a toner layer on the developing roll to the magnetic roll after printing between paper sheets is variably set in accordance with a printing coefficient determined by the data amount and the number of paper sheets passed and further, a method for developing in a color tandem-type image forming apparatus provided with a plurality of the hybrid developing apparatuses for all different colors of toner, which are disposed along the moving direction of a transfer medium of imag
    Type: Grant
    Filed: March 14, 2003
    Date of Patent: March 15, 2005
    Assignee: Kyocera Corporation
    Inventors: Yoshio Ozawa, Shoichi Sakata, Toshinori Nishimura
  • Patent number: 6853822
    Abstract: A device included in an image forming apparatus for removing a substance that disfigures an image. The device includes an adsorbent support that supports an adsorbent. The absorbent has a molecular structure including voids that have a diameter great enough to pass molecules of the disfiguring substance which is deposited on the surface of an image carrier and contain water.
    Type: Grant
    Filed: December 27, 2001
    Date of Patent: February 8, 2005
    Assignee: Ricoh Company, Ltd.
    Inventors: Hidetoshi Yano, Aino Noguchi, Hiromitsu Takagaki, Kiyoshi Tanikawa, Chiaki Tanaka
  • Patent number: 6792218
    Abstract: Artificial toner consumption is triggered to minimize the incidence of “conditioned” toner when a comparison of the rate of toner consumption to the mechanical activity of the electrophotographic printing device indicates that the toner consumption rate is too low. The artificial toner consumption operation may be achieved through a dummy print operation where an intentionally un-printed image is formed on a photoconductive drum, but the corresponding toner is routed to appropriate waste toner reservoir(s) and the image is not printed on the recording medium. The dummy print toner may be cleaned from the photoconductive drum without being transferred to an intermediate transfer medium and/or may be cleaned from the intermediate transfer medium, both without transferring the toner to the recording medium. The dummy print operation may correspond to a next normally occurring interdocument gap or a dedicated dummy print period inserted between print jobs.
    Type: Grant
    Filed: June 11, 2002
    Date of Patent: September 14, 2004
    Assignee: Lexmark International, Inc.
    Inventors: Stanley C. Tungate, Jr., Cary Ravitz, Thomas G. Twardeck, Albert M. Carter, Jr., Gary A. Denton
  • Publication number: 20040042820
    Abstract: The present invention relates to a charging apparatus, comprising a discharging member having a plurality of protrusions and an auxiliary member for assisting discharges by the discharging member. Discharge is made between the discharging member and the auxiliary member upon application of a voltage between the discharging member and the auxiliary member. Where an interval among the distal ends of the plural protrusions of the discharging member is denoted as P and an interval between the discharging member and the auxiliary member is denoted as D, P is equal to or greater than D.
    Type: Application
    Filed: May 30, 2003
    Publication date: March 4, 2004
    Applicant: CANON KABUSHIKI KAISHA
    Inventors: Michio Uchida, Akihiko Takeuchi, Tomoyuki Araki, Tamotsu Kaneko, Takaaki Tsuruya, Isao Matsuoka, Hirotaka Ishii, Tomonori Shida
  • Publication number: 20040042821
    Abstract: An image forming apparatus of the invention includes an image carrier rotatable in a predetermined rotative direction, a charging unit for charging a surface of the image carrier, a precharging device disposed upstream from the charging unit with respect to the predetermined rotative direction of the image carrier for precharging the surface of the image carrier; and a voltage supply unit for supplying a voltage to the precharging device.
    Type: Application
    Filed: August 26, 2003
    Publication date: March 4, 2004
    Inventors: Akihito Onishi, Takao Mizutani, Masayuki Suzuki
  • Patent number: 6654566
    Abstract: A developer agitating system for agitating a developer includes a cartridge detachably mountable to a main body of an electrophotographic image forming apparatus and including a developing member for developing an electrostatic latent image formed on an electrophotographic photosensitive member, a developer container for containing the developer used for development of the electrostatic latent image by the developing member, an agitating member for agitating the developer contained in the developer container, and an informing member having information for indicating that the cartridge is a given cartridge, and a detector for detecting the information in the informing member when the cartridge is mounted to the main body of the electrophotographic image forming apparatus.
    Type: Grant
    Filed: June 2, 2000
    Date of Patent: November 25, 2003
    Assignee: Canon Kabushiki Kaisha
    Inventors: Seiji Yamaguchi, Masahide Kinoshita, Motoki Adachi
  • Patent number: 6567632
    Abstract: The rotating speed of a photosensitive body is reduced for preventing deterioration thereof due to ozone in an electrophotographic device which comprises the photosensitive body, a charger which uniformly charges the surface of the photosensitive body, and a motor control unit which performs drive control for a motor which drives the photosensitive body. The motor control unit provides a plurality of speed levels including a first speed level for rotating the photosensitive body during printing and another speed level for rotating the photosensitive body at a reduced speed lower than the speed used during printing. The speed is changed-over between the plurality of speed levels depending on the operating condition. Thereby, deterioration of the photosensitive body due to ozone generated from the charger is prevented, and additional deterioration of the photosensitive body due to rotation thereof other than during a printing operation is also prevented.
    Type: Grant
    Filed: October 10, 2001
    Date of Patent: May 20, 2003
    Assignee: Hitachi, Ltd.
    Inventors: Yuuichi Takano, Nobuaki Fukasawa, Satoshi Narita
  • Patent number: 6567626
    Abstract: In an image forming apparatus for executing an image forming cycle in which a toner image is formed in response to an image formation start command and an image consisting of a fixed toner image is formed on the recording medium by transferring and fixing the toner image onto a recording medium, and executing a predetermined post-process cycle when a subsequent image formation start command is not issued within a predetermined time after a final image forming cycle is ended, there is provided a sequence controlling means for stopping the post-process cycle and causing a process to shift to a subsequent image forming cycle when the subsequent image formation start command is received during when the post-process cycle is being carried out.
    Type: Grant
    Filed: November 14, 2001
    Date of Patent: May 20, 2003
    Assignee: Fuji Xerox Co., Ltd.
    Inventors: Akitoshi Akaike, Naohisa Fujita, Takashi Kurihara
  • Patent number: 6507718
    Abstract: In an image forming apparatus having a reverse development system and using a two-component developer, respective potentials applied when charging an image bearing member and when applying a development bias to a developer bearing member are attenuated when the image bearing member is driven for an operation other than an image forming operation, compared to respective level of potentials applied when the image bearing member is driven for the image forming operation. Thus, an occurrence of an adhesion of a carrier to an image bearing member is reduced to produce a high quality image, when a power switch of the apparatus is turned off or when a door of the apparatus is opened while the image bearing member is driven for an operation other than the image forming operation, or when the apparatus is activated again after the power switch is turned off.
    Type: Grant
    Filed: August 31, 2001
    Date of Patent: January 14, 2003
    Assignee: Ricoh Company, Ltd.
    Inventors: Tokuya Ohjimi, Kentaroh Matsumoto
  • Patent number: 6453131
    Abstract: An electrophotographic image forming apparatus and method of controlling the apparatus during a warm-up operation. During the warm-up operation, a heating unit for heating a fuser will be turned on and a motor for starting rotation of a photosensitive body will be activated when the temperature of the fuser reaches a motor rotation start temperature. When the temperature of the fuser reaches a warm-up completion temperature, the warm-up operation will be stopped and the rotation of the photosensitive body will be terminated. The warm-up completion temperature is higher than a stand-by temperature but lower than a fusing temperature.
    Type: Grant
    Filed: July 13, 2000
    Date of Patent: September 17, 2002
    Assignee: Murata Kikai Kabushiki Kaisha
    Inventor: Takahiro Sasai
  • Publication number: 20020098011
    Abstract: An image forming apparatus of the present invention includes a latent image forming device for forming a latent image on an image carrier and a developing device for developing the latent image with toner to thereby form a corresponding toner image. The surface of an intermediate image transfer body is movable and includes an high-resistance layer having a volume resistivity of 1010 &OHgr;.cm or above. A primary image transferring device transfers the toner image from the image carrier to the intermediate image transfer body. Secondary image transferring device transfers the toner image from the intermediate image transfer body to a sheet. A polarization uniforming device uniforms, at the beginning of an image forming operation, polarization left in the high-resistance layer while preserving the polarity of the polarization after the surface of the intermediate image transfer body has started moving, but before the toner image is transferred from the image carrier to the secondary image transfer body.
    Type: Application
    Filed: January 23, 2002
    Publication date: July 25, 2002
    Inventors: Takahiro Tamiya, Shinichi Namekata, Shigeru Watanabe
  • Publication number: 20020098012
    Abstract: A non-fixing type image receiving sheet to which toner particles are made adhere in a removable manner and an image forming apparatus. The image receiving sheet has a large number of concave portions accepting toner particles and a large number of convex portions protecting toner particles are formed on a surface of the image receiving sheet. The image forming apparatus has a sheet charging apparatus which charges the surface of the image receiving sheet to a polarity opposite to a charged polarity of toner particles, in advance of a transferring process.
    Type: Application
    Filed: November 20, 2001
    Publication date: July 25, 2002
    Inventors: Masahiko Matsuura, Hiroshi Mizuno, Takaji Kurita, Masashi Yamamoto
  • Publication number: 20020094214
    Abstract: A device included in an image forming apparatus for removing a substance that disfigures an image is disclosed. The device includes an adsorbent support supporting an adsorbent. The absorbent has a molecular structure including voids that have a diameter great enough to pass molecules of the disfiguring substance, which is deposited on the surface of an image carrier, therethrough and contain water therein.
    Type: Application
    Filed: December 27, 2001
    Publication date: July 18, 2002
    Inventors: Hidetoshi Yano, Aino Noguchi, Hiromitsu Takagaki, Kiyoshi Tanikawa, Chiaki Tanaka
  • Patent number: 6389243
    Abstract: A developing unit includes a photosensitive drum, a developing drum, and an agitator. When a charge of toner has dropped below a predetermined charging amount before a subsequent image forming operation starts, a pre-driving operation is performed so that the developing drum and the agitator are rotated before a sheet feed operation starts. Therefore, sufficient charge can be applied to the toner before a developing operation starts, thereby providing a high-quality image. Also, because the photosensitive drum and the developing roller are separated from each other during the pre-driving operation, the photosensitive drum and the developing roller are prevented from being worn down.
    Type: Grant
    Filed: December 4, 2000
    Date of Patent: May 14, 2002
    Assignee: Brother Kogyo Kabushiki Kaisha
    Inventor: Kazumasa Makino
  • Publication number: 20010031154
    Abstract: A first paper-dust removing device is provided to mainly remove pulp fibers of the paper dust. The first paper-dust removing device is located downstream from a transfer position in the photosensitive drum rotating direction. A second paper-dust removing device is provided to mainly remove talc in the paper dust. The second paper-dust removing device may be located downstream from the first paper dust removing device in the photosensitive drum rotating direction or upstream from the transfer position in the sheet conveying direction along the sheet transport path. An additional first paper-dust removing device may be located upstream from the transfer position in the sheet conveying direction along the sheet transport path.
    Type: Application
    Filed: May 11, 2001
    Publication date: October 18, 2001
    Applicant: BROTHER KOGYO KABUSHIKI KAISHA
    Inventors: Shougo Sato, Takeshi Fuwazaki