Charging Member (e.g., Corona Wire) Patents (Class 399/100)
  • Patent number: 10802414
    Abstract: A charging device includes a charging roller and a cleaning roller that includes a core and a foamed elastic layer disposed on an outer circumferential surface of the core and that rotates in contact with a surface of the charging roller. The number of ends of a cell skeleton that protrude from a surface of the foamed elastic layer is 25 ends/mm2 or more and 50 ends/mm2 or less. The cleaning roller is disposed in contact with the charging roller such that the compression ratio of the foamed elastic layer is 30% or less. The compression ratio is represented by Equation (1): compression ratio (%)=(r1/2+r2/2?d)/t1×100??Equation (1): where r1 is the outer diameter (mm) of the cleaning roller, r2 is the outer diameter (mm) of the charging roller, d is the interaxial distance (mm) between the charging roller and the cleaning roller, and t1 is the thickness (mm) of the foamed elastic layer of the cleaning roller.
    Type: Grant
    Filed: January 20, 2020
    Date of Patent: October 13, 2020
    Assignee: FUJI XEROX CO., LTD.
    Inventors: Yasuhiko Kinuta, Fuyuki Kano, Akihiro Nonaka, Keiko Matsuki, Kosuke Narita
  • Patent number: 10802413
    Abstract: A charging device includes: a charging member that is rotatable and has a peripheral surface to be in contact with a charging target and to which a voltage is to be applied for charging the charging target; a removing member that includes a core and a removing material spirally wound one to less than two times around the core and rotates and comes into contact with the charging member to remove an unnecessary material from the peripheral surface of the charging member; and a detecting unit that detects a current flowing between the charging member and the removing member.
    Type: Grant
    Filed: September 4, 2019
    Date of Patent: October 13, 2020
    Assignee: FUJI XEROX CO., LTD.
    Inventors: Keishi Araki, Hiroki Ando, Hirofumi Iida, Satoshi Mizoguchi, Hiroki Oka
  • Patent number: 10788768
    Abstract: A charging device includes a charging member and a cleaning member. The charging member electrically charges a surface of a charging target member and is rotatable while being in contact with the surface of the charging target member. The cleaning member is in contact with a surface of the charging member and removes a foreign object attached to the surface of the charging member. Surface free energy of the surface of the charging member is 5.00 dynes per centimeter or more. A dynamic friction coefficient of the surface of the charging member and a surface of the cleaning member falls within a range from 0.48 to 0.88 both inclusive. The surface free energy and the dynamic friction coefficient satisfy a relation represented by the following expression (1). E??63?+69??(1) “E” is the surface free energy in dynes per centimeter, and “?” is the dynamic friction coefficient.
    Type: Grant
    Filed: October 18, 2019
    Date of Patent: September 29, 2020
    Assignee: Oki Data Corporation
    Inventors: Daiki Morimoto, Yasuhito Annaka
  • Patent number: 10768546
    Abstract: An image forming apparatus includes a photosensitive member and a charging roller to which a direct current voltage is applied. A difference between a first potential (before charging) and a second potential (after charging) of a surface of the photosensitive member in an image forming operation is smaller than 100 V. The charging roller includes a shaft portion, an elastic layer provided on an outer periphery of the shaft portion, and a surface layer provided on an outer periphery of the elastic layer. A ten point height of roughness profile Rz (?m) and a root mean square slope R?q with respected to a surface of the charging roller satisfy Rz?7 and R?q?0.1.
    Type: Grant
    Filed: April 24, 2019
    Date of Patent: September 8, 2020
    Assignee: CANON KABUSHIKI KAISHA
    Inventors: Masato Maejima, Michihiro Yoshida
  • Patent number: 10761449
    Abstract: A charging device includes: a charging member that charges an image holding member according to a contact charging method, and includes a conductive substrate and a surface layer provided on the conductive substrate; and a clean member that cleans the charging member while contacting the charging member, and includes a shaft and a foamed elastic layer provided on the shaft, wherein a ratio of a distance between irregularities in an axial direction of the surface layer in the charging member (Sm) to a width of a nodal section of a foam cell wall surface protruding from a surface of the foamed elastic layer in the clean member (W) satisfies 2.4?Sm/W?5.9.
    Type: Grant
    Filed: July 26, 2019
    Date of Patent: September 1, 2020
    Assignee: FUJI XEROX CO., LTD.
    Inventors: Kosuke Narita, Akihiro Nonaka, Hiroko Kobayashi, Yasuhiko Kinuta, Fuyuki Kano, Yuki Tagawa
  • Patent number: 10719027
    Abstract: A cleaning body includes a shaft and an elastic layer disposed by being spirally wound around an outer circumferential surface of the shaft from one end to the other end of the shaft, wherein a relationship between line roughness of a protruding portion formed at an end portion of the elastic layer in a width direction (RaE) and line roughness of a center portion of the elastic layer in the width direction (RaV) satisfies 5?RaE/RaV.
    Type: Grant
    Filed: July 24, 2019
    Date of Patent: July 21, 2020
    Assignee: FUJI XEROX CO., LTD.
    Inventors: Fuyuki Kano, Yasuhiko Kinuta, Akihiro Nonaka
  • Patent number: 10635025
    Abstract: A transmission for a developer unit that includes a developer roller to apply LEP ink to a photoconductor, a cleaner roller to clean the developer roller, and a squeegee roller to squeegee ink on the developer roller. In one example, the transmission includes a mechanical drive train to, with the cleaner roller, simultaneously drive the developer roller at a first surface speed and the squeegee roller at a second surface speed slower than the first surface speed.
    Type: Grant
    Filed: January 8, 2016
    Date of Patent: April 28, 2020
    Assignee: HP Indigo B.V.
    Inventors: Blair A Butler, Andre Garcia, James Kiang, David Sabo
  • Patent number: 10534294
    Abstract: A cartridge is detachably provided to a main body of an image forming apparatus. The cartridge includes an image bearing member which is rotatable, a charging roller which contacts and charges the image bearing member, and a cleaning member which cleans the charging roller with the brush portion. In a section substantially orthogonal to a rotational axis of the charging roller, a contact point between a surface of the image bearing member and a tangent crossing a downstream end of an abutment region of the brush portion against the charging roller in a rotation direction of the charging roller among tangents to the image bearing member is vertically above a horizontal line passing through a center of the image bearing member, and an upstream end of the abutment region in the rotation direction of the charging roller is vertically above the downstream end in the rotation direction.
    Type: Grant
    Filed: August 3, 2018
    Date of Patent: January 14, 2020
    Assignee: CANON KABUSHIKI KAISHA
    Inventor: Nobuo Oshima
  • Patent number: 10488807
    Abstract: An image forming apparatus executes charging, exposure, toner-supply suspension, and electric-field generation while a photosensitive member rotates at least a full turn. In the charging, a charger charges a portion of a circumferential surface of the photosensitive member. In the exposure, an exposure device exposes the portion, which has been charged in the charging, of the circumferential surface. In the toner-supply suspension, before the portion, which has been exposed in the exposure, of the circumferential surface passes a position at which developer from a developing unit is configured to initially adhere to the circumferential surface, a developing unit stops supplying developer to the photosensitive member. In the electric-field generation, an electric field is generated in a portion of the photosensitive layer of the photosensitive member corresponding to the portion, which has been exposed by the exposure device, of the circumferential surface.
    Type: Grant
    Filed: February 21, 2018
    Date of Patent: November 26, 2019
    Assignee: Brother Kogyo Kabushiki Kaisha
    Inventors: Shota Iriyama, Kazutoshi Kotama, Chieko Mimura, Kengo Yada, Hotaka Kakutani
  • Patent number: 10466615
    Abstract: A rubber member for coating a developing roll which is obtained by coating a coating layer component around a developing roll having a rubber substrate layer and curing the coating layer component is described. The coating layer component contains: (A) a liquid binder containing at least a polyol, an isocyanate compound and reactive silicone oil; (B) silicone rubber particles having a hardness according to JIS K6253: 1997 by Durometer A, measured instantaneously, of 20 to 80 degrees, and a rubber particle size of 0.2 to 10 pm; and a diluting solvent. A ratio of a thickness of the coating layer after curing and a particle size of the rubber satisfies: the rubber particle size/a coating layer thickness <0.3.
    Type: Grant
    Filed: November 6, 2014
    Date of Patent: November 5, 2019
    Assignees: NOK Corporation, Synztec Co. Ltd.
    Inventors: Toshihiro Higashira, Atsushi Ikeda, Nozomu Suzuki, Tomohiro Kondo, Shinobu Kanzaki, Goki Inukai, Lei Wang, Huu Viet Nguyen
  • Patent number: 10444653
    Abstract: A corona discharge device including a corona electrode provided with multiple sharpened tip portions in a row includes a cleaning member which cleans the tip portions of the corona electrode while reciprocating along a predetermined movement direction set in advance with the tip portions biting into the cleaning member. A cleaning position at a surface of the cleaning member is different in a direction intersecting a longitudinal direction of the corona electrode between when the cleaning member moves toward one side in the movement direction and when the cleaning member moves toward another side in the movement direction.
    Type: Grant
    Filed: August 26, 2018
    Date of Patent: October 15, 2019
    Assignee: Sharp Kabushiki Kaisha
    Inventors: Yoshihiro Yoshikawa, Yuhsuke Yoshimoto, Takeshi Nishiyama
  • Patent number: 10429762
    Abstract: An image forming method includes when an image forming device is in a non-image-forming stage, applying voltages to a surface of a photosensitive element and a surface of a developer element of the image forming device to form an electric field. Applying the voltages includes: forming a first potential difference between the photosensitive element and the developer element in a first stage, and forming a second potential difference between the photosensitive element and the developer element in a second stage. When a developer used by the developer element is a negatively charged developer, a direction of the first potential difference and a direction of the second potential difference are in a direction from the developer element to the photosensitive element. When positively charged, the direction of the first potential difference and the direction of the second potential difference are in a direction from the photosensitive element to the developer element.
    Type: Grant
    Filed: July 30, 2018
    Date of Patent: October 1, 2019
    Assignee: ZHUHAI SEINE TECHNOLOGY CO., LTD.
    Inventor: Zhe Shao
  • Patent number: 10423118
    Abstract: A cleaning member includes a core and first and second foamed elastic layers wound around an outer peripheral surface of the core in a double-helical pattern. The compressive stress F1 of the first foamed elastic layer is greater than the compressive stress F2 of the second foamed elastic layer. The cleaning member cleans a member to be cleaned with the first and second foamed elastic layers in contact with a surface of the member to be cleaned.
    Type: Grant
    Filed: August 8, 2018
    Date of Patent: September 24, 2019
    Assignee: FUJI XEROX CO., LTD.
    Inventors: Satoshi Mizoguchi, Fuyuki Kano
  • Patent number: 10317811
    Abstract: It is intended to provide a charging member capable of maintaining high charging performance even when used over a long period. The charging member has an electroconductive support and an electroconductive elastic layer as a surface layer, wherein the electroconductive elastic layer has a roughened surface, and the electroconductive elastic layer has an average Martens' hardness Mc of 2 N/mm2 or larger and 20 N/mm2 or smaller measured with an indentation strength of 0.04 mN at a core surface defined according to a three dimensional surface texture standard (ISO 25178-2:2012), and has an average viscosity Vc of 70×10?3 V or smaller measured in a square of 2 ?m long×2 ?m wide field of view under a scanning probe microscope.
    Type: Grant
    Filed: September 13, 2017
    Date of Patent: June 11, 2019
    Assignee: CANON KABUSHIKI KAISHA
    Inventors: Yuya Tomomizu, Takumi Furukawa, Hiroaki Watanabe, Kenya Terada, Kazuhiro Gesho
  • Patent number: 10268134
    Abstract: To provide a charging device that allows a discharging electrode to be cleaned without damaging a protruding portion at an end portion of the discharging electrode. The device is provided with: a discharging electrode including a plurality of protruding portions arranged along a predetermined direction, the discharging electrode discharging electricity from at least part of the protruding portions; a cleaner for cleaning at least some protruding portions included in the plurality of protruding portions; a cleaner conveyance mechanism for conveying the cleaner along the predetermined direction for performing the cleaning, such that the cleaner interferes with at least some protruding portions included in the plurality of protruding portions; and a cleaner height adjustment mechanism for adjusting a height of the cleaner in a vicinity of the protruding portion where the cleaner reaches at first.
    Type: Grant
    Filed: August 31, 2016
    Date of Patent: April 23, 2019
    Assignee: Sharp Kabushiki Kaisha
    Inventor: Takashi Hori
  • Patent number: 10203625
    Abstract: An electrophotographic image forming apparatus includes: an electrophotographic photosensitive body including an electroconductive substrate, and a charge generating layer, a charge transfer layer and a surface protective layer laminated on the substrate in this order, and a charging roller for causing contact electrification on the surface of the electrophotographic photosensitive body, wherein at least the surface protective layer contains inorganic microparticles having a fluorine compound on the surfaces and a binder resin, and the surface of the charging roller has a maximum height roughness Rz?0.5 ?m.
    Type: Grant
    Filed: December 11, 2017
    Date of Patent: February 12, 2019
    Assignee: KONICA MINOLTA, INC.
    Inventors: Kazuhiro Kuramochi, Seisuke Maeda, Kuniaki Kashiwakura
  • Patent number: 10175601
    Abstract: A cleaning device includes a cleaning member, a first bearing member, a second bearing member, and a moving mechanism. The cleaning member includes a shaft portion and an elastic layer disposed around the shaft portion. The elastic layer is brought into contact with a rotating charging body. The cleaning member cleans the charging body while rotating. The first bearing member supports a first end portion of the shaft portion while rendering the shaft portion rotatable. The second bearing member supports a second end portion of the shaft portion while rendering the shaft portion rotatable. The moving mechanism is supported by the first bearing member and the second bearing member. The moving mechanism periodically moves the shaft portion in an axial direction of the shaft portion together with a rotation of the cleaning member.
    Type: Grant
    Filed: October 16, 2017
    Date of Patent: January 8, 2019
    Assignee: FUJI XEROX CO., LTD.
    Inventors: Shuhei Yamazaki, Keiichiro Sato, Yasuhiro Funayama
  • Patent number: 10108133
    Abstract: A cleaning device includes a cleaning roller, a cleaning blade, a toner layer forming member and a regulating member. The cleaning roller comes into contact with a surface of a rotating image carrier and rotates. The cleaning blade comes into contact with the image carrier at a downstream side from the cleaning roller in a rotating direction of the image carrier and scrapes toner adhered to the image carrier. The toner layer forming member receives and collects the toner scraped by the cleaning blade and feeds the toner to the cleaning roller to form a toner layer on the cleaning roller. The regulating member comes into contact with the cleaning roller to regulate thickness of the toner layer. The regulating member is controlled so as to thicken thickness of the toner layer formed on the cleaning roller as rotating rate of the image carrier becomes slower.
    Type: Grant
    Filed: May 11, 2018
    Date of Patent: October 23, 2018
    Assignee: KYOCERA Document Solutions Inc.
    Inventor: Keigo Kimura
  • Patent number: 10095148
    Abstract: A charging device includes a first cleaning member that cleans a surface of a charging wire by moving along the wire while being in contact with the wire at a first side; and a second cleaning member that cleans the surface of the wire by moving while being in contact with the wire at a second side, and moving relative to the first cleaning member in a crossing direction that crosses a wire length direction.
    Type: Grant
    Filed: August 1, 2017
    Date of Patent: October 9, 2018
    Assignee: FUJI XEROX CO., LTD.
    Inventors: Yusuke Kitagawa, Sadao Okano, Yasuo Takayama, Akiko Kimura
  • Patent number: 10095147
    Abstract: A cleaning body includes a shaft and an elastic layer that is helically wound around the shaft from one end side to the other end side of the shaft and fixed on the shaft and that cleans a body to be cleaned while the elastic layer rotates. The elastic layer includes a division portion having plural divided segments and having a length of from 20% to 70% of the full length of the elastic layer. The division portion is located in a longitudinal central portion of the elastic layer. In the sectional view perpendicular to the axial direction of the shaft, a minimum thickness part in the longitudinal central portion of the elastic layer is from 5% to 12% thicker than a minimum thickness part in each longitudinal end portion of the elastic layer.
    Type: Grant
    Filed: March 7, 2017
    Date of Patent: October 9, 2018
    Assignee: FUJI XEROX CO., LTD.
    Inventors: Fuyuki Kano, Minoru Rokutan
  • Patent number: 10088769
    Abstract: A corona discharge device including a corona electrode provided with multiple sharpened tip portions in a row includes a cleaning member which cleans the tip portions of the corona electrode while reciprocating along a predetermined movement direction set in advance with the tip portions biting into the cleaning member. A cleaning position at a surface of the cleaning member is different in a direction intersecting a longitudinal direction of the corona electrode between when the cleaning member moves toward one side in the movement direction and when the cleaning member moves toward another side in the movement direction.
    Type: Grant
    Filed: May 9, 2017
    Date of Patent: October 2, 2018
    Assignee: Sharp Kabushiki Kaisha
    Inventors: Yoshihiro Yoshikawa, Yuhsuke Yoshimoto, Takeshi Nishiyama
  • Patent number: 10036973
    Abstract: An image forming apparatus according to an embodiment includes a photoconductive drum and a charging roller facing the photoconductive drum. The charging roller receives a potential bias. A controller performs an electrostatic cleaning operation by alternately applying, to the charging roller, a first bias and a second bias of opposite polarity to the first bias so that contaminants repelled by the first bias and contaminants repelled by the second bias are transferred from the charging roller to the photoconductive drum.
    Type: Grant
    Filed: January 25, 2017
    Date of Patent: July 31, 2018
    Assignees: KABUSHIKI KAISHA TOSHIBA, TOSHIBA TEC KABUSHIKI KAISHA
    Inventor: Yoshinori Sanmonji
  • Patent number: 10031467
    Abstract: A cleaning roller includes a shaft and an elastic body. The shaft extends in an axial direction where a center axis of the shaft extends. The shaft defines a radial direction and has a circumferential surface. The elastic body is helically wound about the shaft and defines a helical direction. The elastic body has a widthwise dimension in a widthwise direction orthogonal to the helical direction and to the radial direction. The elastic body has a base end portion extending in the helical direction and a distal end portion extending in the helical direction. The base end portion is in contact with the circumferential surface and fixed thereto. The distal end portion has a sharp edge and is positioned farthest from the circumferential surface in the radial direction. The widthwise dimension is gradually reduced from the base end portion to the distal end portion in the radial direction.
    Type: Grant
    Filed: February 1, 2017
    Date of Patent: July 24, 2018
    Assignee: BROTHER KOGYO KABUSHIKI KAISHA
    Inventors: Kengo Yada, Keigo Nakajima, Yuichi Matsushita, Hotaka Kakutani, Shota Iriyama, Atsushi Ozawa
  • Patent number: 9989914
    Abstract: A cleaning roller including a shaft including a rotational axis extending in an axial direction and an elastic layer covering the shaft. The elastic layer includes a base covering the shaft and a first helical protrusion protruding from the base and having a first helical ridge.
    Type: Grant
    Filed: January 31, 2017
    Date of Patent: June 5, 2018
    Assignee: BROTHER KOGYO KABUSHIKI KAISHA
    Inventors: Kengo Yada, Yuichi Matsushita, Keigo Nakajima, Hotaka Kakutani, Shota Iriyama, Atsushi Ozawa
  • Patent number: 9915888
    Abstract: Image carrying member units are each provided with an image carrying member, a charging device, and a pair of support frames. The charging device has: a charging roller that charges the image carrying member by rotation driven by the image carrying member; a cleaning member for cleaning the charging roller; a pair of bearing members for rotatably supporting both end parts of the cleaning member and the charging roller; and biasing members for biasing the bearing members in a direction in which the same moves closer to the image carrying member. An image carrying member bearing part and a first cleaning member bearing part for rotatably supporting one end part of the rotating shaft for the cleaning member where an input side gear is provided, are formed integrally on a first support frame for supporting one end part of the image carrying member where an output side gear is provided.
    Type: Grant
    Filed: February 2, 2016
    Date of Patent: March 13, 2018
    Assignee: KYOCERA Document Solutions Inc.
    Inventors: Hiroki Morishita, Yasuyuki Fukunaga
  • Patent number: 9880484
    Abstract: An image forming apparatus includes a cleaning device located, in a direction in which an intermediate transfer belt rotates, downstream of a second transfer position and upstream of a first transfer position, at which a first transfer device transfers a toner image onto the intermediate transfer belt, the cleaning device cleaning the intermediate transfer belt; and a charging member located upstream of the first transfer position and downstream of the cleaning device in the direction in which the intermediate transfer belt rotates, the charging member having a shape of a roller having a diameter smaller than a diameter of a driving roller that drives the intermediate transfer belt to rotate the intermediate transfer belt, the charging member charging the intermediate transfer belt by holding the intermediate transfer belt between the charging member and the driving roller and touching an outer surface of the intermediate transfer belt.
    Type: Grant
    Filed: August 2, 2016
    Date of Patent: January 30, 2018
    Assignee: FUJI XEROX CO., LTD.
    Inventor: Yohei Tazaki
  • Patent number: 9851653
    Abstract: A charging device includes an electrode, a cleaning member that moves along the electrode and cleans the electrode, a rotating member that is disposed along the electrode, includes a spiral protruding portion on an outer circumferential surface thereof, and circumferentially rotates, and a movable member to which the cleaning member is attached. The movable member includes a first through hole through which the rotating member passes, a first pressed portion that is provided on an inner circumferential surface of the first through hole and pressed by the protruding portion of the rotating member, and a second pressed portion that is disposed at a different position from a position of the first pressed portion in an axial direction of the rotating member and that is disposed such that one or more turns of the protruding portion are positioned between the second pressed portion and the first pressed portion.
    Type: Grant
    Filed: August 22, 2016
    Date of Patent: December 26, 2017
    Assignee: FUJI XEROX CO., LTD.
    Inventors: Yusuke Kitagawa, Akiko Kimura, Yasuo Takayama, Sadao Okano
  • Patent number: 9841697
    Abstract: A cleaning member includes a core and an elastic layer helically wound around an outer peripheral surface of the core so as to extend from one end to the other end of the core. When the cleaning member is rotated by a member to be cleaned, a non-contact region in which a first end portion and a second end portion of the elastic layer in an axial direction of the core are not in contact with the member to be cleaned is in a range from approximately 0° to approximately 60° in terms of a rotation angle of the cleaning member viewed from one side in the axial direction of the core.
    Type: Grant
    Filed: July 8, 2016
    Date of Patent: December 12, 2017
    Assignee: FUJI XEROX CO., LTD.
    Inventors: Minoru Rokutan, Fuyuki Kano
  • Patent number: 9817329
    Abstract: A charging device includes a first cleaning member, a first electrode, a second cleaning member, a second electrode, and a movable body. The first cleaning member moves in one direction. The first electrode is cleaned by the first cleaning member moving in the one direction. The second cleaning member moves in the one direction together with the first cleaning member and moves so that a downstream end portion thereof, which is located downstream in the one direction, serves as a leading portion and an upstream end portion thereof comes after the downstream end portion. The second electrode includes a first region and a second region. The first region is cleaned by the second cleaning member moving in the one direction. The second region is located downstream in comparison with the first region in the one direction.
    Type: Grant
    Filed: August 22, 2016
    Date of Patent: November 14, 2017
    Assignee: FUJI XEROX CO., LTD.
    Inventors: Akiko Kimura, Sadao Okano, Yasuo Takayama, Yusuke Kitagawa
  • Patent number: 9791800
    Abstract: A charging device includes: an electrode; a cleaning member that cleans the electrode; a moving body that moves along the electrode, the cleaning member that is attached to the moving body; and a rotation member that is disposed along the electrode and that includes a spiral protrusion on an outer circumferential surface thereof to move the moving body, the rotation member that is rotated in a circumferential direction. A plurality of kinds of pitch intervals of the protrusion are provided on at least a central portion of the rotation member in a longitudinal direction.
    Type: Grant
    Filed: August 19, 2016
    Date of Patent: October 17, 2017
    Assignee: FUJI XEROX CO., LTD.
    Inventors: Yasuo Takayama, Sadao Okano, Akiko Kimura, Yusuke Kitagawa
  • Patent number: 9778588
    Abstract: A cleaning member includes a core and an elastic layer disposed on an outer peripheral surface of the core. A circumferential cover length over which the elastic layer covers the core in a circumferential direction is greater at least at one of first and second end portions in an axial direction of the core than at a central portion in the axial direction. The central portion in the axial direction extends from one end to the other end of the core in the axial direction. When the cleaning member is rotated by a member to be cleaned, a non-contact region in which the first and second end portions in the axial direction are not in contact with the member to be cleaned is in a range from approximately 0° to approximately 15° in terms of a rotation angle of the cleaning member viewed from one side in the axial direction.
    Type: Grant
    Filed: July 8, 2016
    Date of Patent: October 3, 2017
    Assignee: FUJI XEROX CO., LTD.
    Inventors: Minoru Rokutan, Fuyuki Kano
  • Patent number: 9753408
    Abstract: An image forming apparatus includes an image bearer to bear a latent electrostatic image thereon, a developing device to supply a development agent to the latent electrostatic image to obtain a visible image, a transfer roller to contact the image bearer to transfer the visible image to a recording medium, a replenishing device to replenish the developing device with the development agent when a density value read from a density detection pattern formed on the image bearer by the developing device is equal to or less than a threshold, a processing device to conduct a predetermined processing to reduce attachment of the development agent to the transfer roller, and a control device to control the number of times the predetermined processing is performed or processing time in performing the predetermined processing for the processing device, based on whether there is replenishment of the development agent to the developing device.
    Type: Grant
    Filed: June 9, 2016
    Date of Patent: September 5, 2017
    Assignee: Ricoh Company, Ltd.
    Inventors: Yasuko Yoshikawa, Junichi Mizawa, Ichiro Komuro, Shuuichi Endoh, Yohsuke Saitoh, Toru Ohmine, Kenji Sato, Masato Mukai
  • Patent number: 9639020
    Abstract: A cleaning device includes a cleaning member, which includes a shaft portion and an elastic layer. The shaft portion is disposed so as to extend in a rotation axis direction of a rotating object that is to be cleaned. The elastic layer is helically disposed on an outer circumferential surface of the shaft portion from one end portion to the other end portion in an axial direction. The elastic layer touches an outer circumferential surface of the object and at least one end surface of the object in the rotation axis direction. A relationship between a cross-sectional area Sa of the object taken perpendicular to an axis of the object and a cumulative total contact area Sb of a portion of the end surface of the object in the rotation axis direction touched by the elastic layer during one rotation of the object satisfies 0.11?Sb/Sa<0.30.
    Type: Grant
    Filed: April 22, 2016
    Date of Patent: May 2, 2017
    Assignee: FUJI XEROX CO., LTD.
    Inventors: Fuyuki Kano, Minoru Rokutan
  • Patent number: 9632444
    Abstract: A charging unit includes: a charging member that contacts with an image holding body holding an image and charges a surface of the image holding body; a support member that supports the charging member; and a pressing member that has plural springs that expand and contract in a direction from the support member to the image holding body, and pushes the support member toward the image holding body, and at least two of the plural springs of the pressing member are formed by a single metal wire.
    Type: Grant
    Filed: January 8, 2016
    Date of Patent: April 25, 2017
    Assignee: FUJI XEROX CO., LTD.
    Inventors: Mikio Yamaguchi, Yosuke Ninomiya, Tomoya Oki, Hiroshi Nishikawa
  • Patent number: 9563145
    Abstract: An image forming apparatus includes an image carrier that carries a developer image formed by a developer including external additives, a charging member for charging the image carrier, a developer carrier that carries the developer, a developer supply member to which a supply voltage is applied for supplying the developer to the developer carrier, a main controller that controls an image formation mode for developing the developer image and controls a cleaning sequence mode for cleaning the charging member, and a voltage controller that changes outputs of the charging voltage, the development voltage and the supply voltage, and executes the cleaning sequence mode based on instructions of the main controller. When executing the cleaning sequence mode, the voltage controller makes an absolute value of the charging voltage larger than that in the image forming mode, and afterwards sets the output of the charging voltage to an OFF state.
    Type: Grant
    Filed: January 20, 2016
    Date of Patent: February 7, 2017
    Assignee: Oki Data Corporation
    Inventor: Ken Kato
  • Patent number: 9557678
    Abstract: A charging device includes a charging member that is opposed to and contacts a charged body, the charging member extending axially and rotating in response to rotation of the charged body, a cleaning member that extends axially along the charging member, and contacts a surface of the charging member to clean the charging member, a holding member that holds the charging member and the cleaning member in a manner allowing their displacement by a substantially constant amount while maintaining a distance between their axes, multiple bearing members provided to the holding member with their rotation being arrested, the bearing members individually supporting the shafts of the charging member and cleaning member in a manner allowing their rotation, the bearing members being displaced to follow a change in orientation of the shafts, and an urging member that urges the holding member to press the charging member onto the charged body.
    Type: Grant
    Filed: August 18, 2015
    Date of Patent: January 31, 2017
    Assignee: FUJI XEROX CO., LTD.
    Inventors: Yuta Hoshino, Shiro Ohashi, Naoki Onishi, Tatsuya Soga
  • Patent number: 9535358
    Abstract: In a corona charger including a housing that encloses a discharge electrode and has an open portion on a charging-object side and a shutter that opens and closes the open portion, if discharge products dropped from ends of the shutter adhere to a photosensitive member and absorbs moisture, an image defect called “image deletion” may occur. A charging device includes a corona charger including a discharge electrode and shields provided on two respective sides of the discharge electrode. The corona charger has an open portion on a charging-object side thereof. The open portion is opened and closed by a sheet-type shutter in a longitudinal direction of the charger. The sheet-type shutter is curled in a transverse direction such that a central portion bulges, with respect to two ends, in a thickness direction of the shutter from a front surface that is nearer to the discharge electrode toward a back surface.
    Type: Grant
    Filed: June 23, 2014
    Date of Patent: January 3, 2017
    Assignee: Canon Kabushiki Kaisha
    Inventors: Tadashi Fukuda, Yoshiro Nishino
  • Patent number: 9494894
    Abstract: Wheels configured to be supported by a metallic roller on an outside of end portions of a contact area and inside of end portions of the transfer belt in terms of a width direction are provided, and the wheels are formed of a non-conductive resin.
    Type: Grant
    Filed: December 10, 2014
    Date of Patent: November 15, 2016
    Assignee: Canon Kabushiki Kaisha
    Inventors: Shuichi Tetsuno, Shinji Katagiri, Masaru Ohno
  • Patent number: 9477169
    Abstract: An elastic member includes a support and an elastic layer on the support. The elastic layer contains a rubber material and a softener having a number average molecular weight Mn of about 600 to about 1,000 and a ratio (Mw/Mn) of weight average molecular weight Mw to number average molecular weight Mn of about 2.5 or less.
    Type: Grant
    Filed: February 19, 2016
    Date of Patent: October 25, 2016
    Assignee: FUJI XEROX CO., LTD.
    Inventors: Shogo Tomari, Takuro Hoshio
  • Patent number: 9405210
    Abstract: Provided is an image forming apparatus including an image holder that is mounted at a predetermined mount position, a charging member that charges the image holder, a cleaning member that cleans the charging member, a holding member that holds the charging member and the cleaning member, includes a mount section on which the cleaning member is mounted, is urged toward the image holder side, and recedes when the image holder is mounted at the predetermined mount position, and a drop-out prevention section that is disposed at a position facing the mount section which is included in the holding member at a receding position and that prevents the cleaning member from dropping out from the mount section.
    Type: Grant
    Filed: February 2, 2015
    Date of Patent: August 2, 2016
    Assignee: FUJI XEROX CO., LTD.
    Inventors: Mikio Yamaguchi, Ichiro Kawahara, Hiroki Ando, Keishi Araki, Hirofumi Iida
  • Patent number: 9395642
    Abstract: An image forming apparatus includes a plurality of photosensitive drums, and a controller for executing, when an absolute value of a set point of a charged potential is not higher than a predetermined threshold, an operation in a first mode in which charging bias voltages and transfer bias voltages are applied to image regions of the drums, at a preset length of time before image exposures are carried out by the exposure members and thereafter, the image exposures are carried out by the exposure members, respectively, and for executing, when the absolute value of the set point of the charged potential is higher than the predetermined threshold, an operation in a second mode in which timings of starting applications of the transfer bias voltages to the transfer members are delayed as compared with those in the first mode, respectively.
    Type: Grant
    Filed: December 26, 2013
    Date of Patent: July 19, 2016
    Assignee: Canon Kabushiki Kaisha
    Inventor: Taisuke Matsuura
  • Patent number: 9389583
    Abstract: An image forming apparatus includes an apparatus main-body to and from which a process cartridge can be attached and detached. The process cartridge includes an image carrying member to carry an image, a charging member to charge the image carrying member, a cleaning member to clean the charging member by contacting it, and a force receiving unit to receive a force for moving the cleaning member in a longitudinal direction of the image carrying member. The apparatus main-body includes a slope portion which slopes in a direction in which the process cartridge is attached and contacts the force receiving unit to apply the force in a process where the process cartridge is attached to the apparatus main-body, and the slope portion applies the force to the force receiving unit to move the cleaning member from an inside to an outside of a region where an image can be formed.
    Type: Grant
    Filed: January 21, 2015
    Date of Patent: July 12, 2016
    Assignee: Canon Kabushiki Kaisha
    Inventors: Naoki Maeda, Atsushi Takasaka, Ryuta Murakami
  • Patent number: 9372427
    Abstract: Provided is a cleaning member, including a shaft portion, a foam elastic layer that is disposed helically from one end side in an axial direction to the other end side in the axial direction on an outer circumferential surface of the shaft portion, and an adhesive layer that adheres the shaft portion to the foam elastic layer, wherein the foam elastic layer is subjected to a compression process in a radial direction of the shaft portion at a portion of a circumferential direction at an end portion in the axial direction of the shaft portion, and a circumferential direction coverage width of a non-compressed region at the end portion in the axial direction which is subjected to the compression process is wider than a circumferential direction coverage width at a center portion in the axial direction of the shaft portion.
    Type: Grant
    Filed: October 21, 2015
    Date of Patent: June 21, 2016
    Assignee: FUJI XEROX CO., LTD.
    Inventors: Fuyuki Kano, Minoru Rokutan
  • Patent number: 9367020
    Abstract: A cleaning member includes a core, and an elastic layer including a strip-shaped elastic member that is spirally wound around a region of an outer peripheral surface of the core ranging from one end to another end of the core, wherein a width W1 of the elastic layer is less than or equal to a radius R of the core and is 1 mm or more.
    Type: Grant
    Filed: May 4, 2015
    Date of Patent: June 14, 2016
    Assignee: FUJI XEROX CO., LTD.
    Inventors: Minoru Rokutan, Fuyuki Kano
  • Patent number: 9360788
    Abstract: A roller member used in an image forming apparatus includes a metallic shaft. The metallic shaft includes a cylindrical portion formed so that one end portion and an other end portion of the metallic plate oppose each other and a projecting portion projecting from an end surface of the cylindrical portion outward in an axial direction of the metallic shaft. The projecting portion includes an end surface located at an end of the projecting portion in the axial direction and an inclined surface configured to connect the end surface of the projecting portion and the end surface of the cylindrical portion. The inclined surface is inclined with respect to the axial direction of the metallic shaft by extending outward from the end surface of the projecting portion in a circumference direction of the cylindrical portion.
    Type: Grant
    Filed: March 30, 2015
    Date of Patent: June 7, 2016
    Assignee: Canon Kabushiki Kaisha
    Inventors: Kohki Kamata, Motomi Suzuki, Haruyasu Ishikawa
  • Patent number: 9354538
    Abstract: A charging device includes a charger and a power supply circuit. The charger is disposed opposing a latent image bearer. The power supply circuit applies to the charger an alternating voltage obtained by superimposing a pulsating voltage on a direct-current voltage. The alternating voltage generates normal discharge from the charger to a surface of the latent image bearer and reverse discharge from the surface of the latent image bearer to the charger. A pulse ON time of a voltage component toward a reverse discharge side relative to a desired surface potential Vde of the latent image bearer is shorter than a pulse ON time of a voltage component toward a normal discharge side relative to the desired surface potential Vde of the latent image bearer.
    Type: Grant
    Filed: February 19, 2015
    Date of Patent: May 31, 2016
    Assignee: Ricoh Company, Ltd.
    Inventors: Hideyasu Seki, Satoshi Hatori, Takeshi Fukao, Yuta Kawashima
  • Patent number: 9342030
    Abstract: An alternating current generation circuit has a transformer and generates an alternating current voltage in accordance with a pulse signal input to the transformer. A clamp circuit has a constant-voltage element and a current limit element connected in series between the transformer, an output end of the alternating current voltage, and a ground. A direct current generation circuit generates a direct current voltage in accordance with a duty cycle of the input pulse signal. The direct current generation circuit converts, into a direct current voltage, a current that flows from the clamp circuit via the ground, and superimposes the direct current voltage on the alternating current voltage, and a voltage obtained by superimposing the direct current voltage on the alternating current voltage is output from the output end.
    Type: Grant
    Filed: October 6, 2015
    Date of Patent: May 17, 2016
    Assignee: CANON KABUSHIKI KAISHA
    Inventor: Akira Tatsuzue
  • Patent number: 9335705
    Abstract: A rotor bearing member is attached to a support body. The support body includes a guide section that supports a first member and a second member such that the first member and the second member are movable toward a rotor. The first member includes a rotary shaft and rotates about the rotary shaft thereof while being in contact with the rotor. The second member includes a rotary shaft extending along the rotary shaft of the first member and cleans a surface of the first member while rotating in contact with the first member. The rotor bearing member includes a first bearing member and a second bearing member that rotatably support the rotary shaft of the second member and the rotary shaft of the first member, respectively, while the first bearing member and the second bearing member abut each other.
    Type: Grant
    Filed: May 26, 2015
    Date of Patent: May 10, 2016
    Assignee: FUJI XEROX CO., LTD.
    Inventors: Tsuneo Fukuzawa, Hirohisa Hoshino, Takeo Fukai, Koji Fukumuro, Kenji Suzuki, Hirokazu Ichihara, Akihito Nishimura
  • Patent number: 9298125
    Abstract: An image forming apparatus includes a latent image bearing member, a charging unit, a charging power source, a latent image writing unit, a development unit, a transfer unit, a toner detector, and a controller. The controller causes a background fog pattern to be formed on a surface of the latent image bearing member. In addition to the background fog pattern, the controller causes a latent image to be developed to form a toner image used for position identification on the surface of the latent image bearing member. The controller identifies a time when the toner image used for position identification has entered a detection range of the toner detector based on a change in outputs of the toner detector to determine a time when each of sections of the background fog pattern enters the detection range based on the identified time.
    Type: Grant
    Filed: October 31, 2014
    Date of Patent: March 29, 2016
    Assignee: Ricoh Company, Ltd.
    Inventors: Hiroyuki Sugiyama, Takamasa Ozeki, Tomoko Takahashi, Yoshinori Nakagawa, Masahiko Shakuto, Ryuji Yoshida, Taichi Urayama, Ryusuke Mase, Shotaro Hoshi
  • Patent number: 9280078
    Abstract: A charging device includes a charging member that charges a surface of an image bearing body. The charging member includes a rotation shaft applied with a voltage, and a resilient conductive layer provided on an outer circumferential surface of the rotation shaft. The resilient conductive layer charges the surface of the image bearing body. The resilient conductive layer has a plurality of high resistance regions arranged at intervals in an axial direction of the rotation shaft.
    Type: Grant
    Filed: November 5, 2014
    Date of Patent: March 8, 2016
    Assignee: OKI DATA CORPORATION
    Inventor: Toshimasa Higaki