Roller Patents (Class 399/176)
  • Patent number: 11454920
    Abstract: An example image forming apparatus includes a main body, a driving motor rotatable in a first direction to provide a driving force to a developing cartridge and rotatable in a second direction opposite to the first direction, and a support assembly to, based on the developing cartridge being mounted to the main body, provide the driving force of the driving motor in the first direction to the mounted developing cartridge, and detach the mounted developing cartridge from the main body using the driving force of the driving motor in the second direction.
    Type: Grant
    Filed: December 17, 2019
    Date of Patent: September 27, 2022
    Assignee: Hewlett-Packard Development Company, L.P.
    Inventors: Pil Seung Oh, Taeil Jung, Byung Woo Kim, Taejin Yoon
  • Patent number: 11448982
    Abstract: An electrophotographic apparatus including an electrophotographic photosensitive member, a charging unit, and a developing unit, wherein the charging unit includes a conductive member disposed to be contactable with the electrophotographic photosensitive member, a conductive layer of the conductive member has a matrix-domain structure, at least some of the domains are exposed at the outer surface of the conductive member, the volume resistivity RI of the matrix is greater than 1.00×1012 ?·cm and not greater than 1.00×1017 ?·cm, the matrix volume resistivity R1 is at least 1.0×105-times the domain volume resistivity R2, and the developing unit includes a toner, the toner includes a binder resin-containing toner particle and an external additive, and the external additive contains fine particles of a hydrotalcite compound.
    Type: Grant
    Filed: October 15, 2020
    Date of Patent: September 20, 2022
    Assignee: CANON KABUSHIKI KAISHA
    Inventors: Tsuneyoshi Tominaga, Shohei Tsuda, Shohei Kototani, Noriyoshi Umeda, Masahiro Kurachi, Kazuhiro Yamauchi, Motonari Ito
  • Patent number: 11397388
    Abstract: A process for producing an electrophotographic electroconductive member having an electroconductive support and an electroconductive layer in the order mentioned. The electroconductive layer has a matrix including a crosslinked product of a first rubber, and a domain including a crosslinked product of a second rubber and an electroconductive particle, the process including the steps of: providing a rubber mixture for forming the domain, including carbon black and the second rubber by kneading the carbon black and the second rubber; providing a rubber mixture for forming the matrix, including the first rubber; kneading the rubber mixture for forming the domain and the rubber mixture for forming the matrix to prepare a rubber composition having a matrix-domain structure; forming a layer of the rubber composition on a surface of the electroconductive support; and curing the layer of the rubber composition on the surface of the electroconductive support to form the electroconductive layer.
    Type: Grant
    Filed: October 7, 2021
    Date of Patent: July 26, 2022
    Assignee: CANON KABUSHIKI KAISHA
    Inventors: Satoru Nishioka, Masahiro Kurachi, Kenji Takashima, Yuichi Kikuchi, Kazuhiro Yamauchi, Kana Sato, Takumi Furukawa, Hiroaki Watanabe, Kenya Terada, Yuya Tomomizu, Toshimitsu Nakazawa
  • Patent number: 11392055
    Abstract: A developing cartridge includes: a developing roller rotatable about an axis extending in a first direction; a casing; and a first cam provided at an outer surface of one end portion of the casing in a second direction. The first cam is movable in a third direction between a first position and a second position closer to the developing roller than the first position is in the third direction. The first cam has: a first inclined surface for receiving a pressing force in the first direction; and a second inclined surface. A distance between the second inclined surface and the casing in the second direction varies as the second inclined surface extends away from the developing roller in the third direction. The first cam is movable between the first position and the second position in response to application of the pressing force to the first inclined surface.
    Type: Grant
    Filed: July 13, 2021
    Date of Patent: July 19, 2022
    Assignee: BROTHER KOGYO KABUSHIKI KAISHA
    Inventor: Go Iwasa
  • Patent number: 11385559
    Abstract: Provided is an electrophotographic electroconductive member including an electroconductive support and an electroconductive layer on the support, an electroconductive member is used, in which an electroconductive layer has a matrix comprising a first rubber, and domains dispersed in the matrix, the domains each comprising a second rubber and an electronic electroconductive agent, and for impedance measured by applying an AC voltage with an amplitude of 1 V to the electroconductive layer while varying frequencies between 1.0×10?2 Hz to 1.0×107 Hz under a specific environment, when a double logarithmic plot with a frequency on an abscissa and an impedance on an ordinate is obtained, a slope on a high frequency side is ?0.8 or more and ?0.3 or less, and the impedance a low frequency side is from 1.0×103 to 1.0×107?.
    Type: Grant
    Filed: October 16, 2020
    Date of Patent: July 12, 2022
    Assignee: CANON KABUSHIKI KAISHA
    Inventors: Yuichi Kikuchi, Satoru Nishioka, Kenji Takashima, Kazuhiro Yamauchi, Masahiro Kurachi, Takumi Furukawa, Hiroaki Watanabe, Kenya Terada, Yuya Tomomizu, Toshimitsu Nakazawa
  • Patent number: 11378910
    Abstract: A process cartridge is provided, which is configured to recover, with a developing member, developer remaining on an image bearing member after transfer of a developer image to a transfer receiving member, wherein a charging member has a shaft that is conductive and an elastic layer supported on the shaft and being in contact with the image bearing member; the elastic layer has a matrix containing a first rubber, and a plurality of domains containing a second rubber and an electron-conductive agent and interspersed within the matrix. The electric resistance of the domains is lower than the electric resistance of the matrix. The matrix is exposed on an outer surface of the elastic layer and forms multiple depressed portions, and the domains include a domains exposed at a bottom section of the depressed portion.
    Type: Grant
    Filed: October 13, 2020
    Date of Patent: July 5, 2022
    Assignee: CANON KABUSHIKI KAISHA
    Inventors: Takashi Mukai, Takashi Hiramatsu, Shuhei Tokiwa, Takayuki Namiki, Takumi Furukawa, Yuichi Kikuchi, Kazuhiro Yamauchi
  • Patent number: 11347156
    Abstract: The electro-conductive member has an electro-conductive support, and an electro-conductive layer in this order, the electro-conductive layer including a matrix and domains, the matrix constituted by a first rubber composition containing a cross-linked product of a first rubber, the domains having electro-conductivity, and dispersed in the matrix, each of the domains constituted by a second rubber composition containing a cross-linked product of a second rubber and an electro-conductive particle, the first rubber and the second rubber being diene-based rubbers, the first rubber having at least one monomer unit, the second rubber having at least one monomer unit different from the monomer unit which the first rubber has; a difference of absolute values of SP values between the first rubber and the second rubber is 0.2 (J/cm3)0.5 to 4.0 (J/cm3)0.5; and a tan ?1/tan ?2 is 0.45 to 2.00.
    Type: Grant
    Filed: March 20, 2020
    Date of Patent: May 31, 2022
    Assignee: CANON KABUSHIKI KAISHA
    Inventors: Masahiro Kurachi, Kazuhiro Yamauchi, Satoru Nishioka, Kenji Takashima, Yuichi Kikuchi
  • Patent number: 11314180
    Abstract: Provided are a charging roller excellent in charging characteristics (charging property/charge imparting property), elasticity/flexibility, durability, and filming resistance, and an image forming apparatus using the charging roller. The charging roller includes a shaft, and at least a base layer and a surface layer on an outer peripheral portion of the shaft in a radial direction, where the surface layer contains large-particle size particles and small-particle size particles having different average particle sizes and further contains hydrophilic particles; the water contact angle of the hydrophilic particles measured with a sessile drop technique is preferably more than 0 degree and 90 degrees or less and more preferably 50 degrees or more and 90 degrees or less; the large-particle size particles are large-particle size acrylic resin particles; the small-particle size particles are small-particle size acrylic resin particles; and the hydrophilic particles are hydrophilic silica particles.
    Type: Grant
    Filed: September 29, 2020
    Date of Patent: April 26, 2022
    Assignee: BRIDGESTONE CORPORATION
    Inventor: Manami Morioka
  • Patent number: 11307509
    Abstract: An electro-conductive layer of an electrophotographic electro-conductive member has a matrix-domain structure. The matrix contains a first rubber. The domain contains a second rubber and electro-conductive particles. Where ? represents an average of ratios of the cross-sectional area of the electro-conductive particles contained in each of the domains to the cross-sectional area of each of the domains appearing on a cross-section of the electro-conductive layer in a thickness direction, and ? represents a standard deviation of the ratios, ?/? is 0 or more and 0.4 or less, and ? is 20% or more and 40% or less. At least eight of samples with a first cubic shape 9 ?m on a side, which are sampled at arbitrary nine positions on the electro-conductive layer, satisfy the specified condition.
    Type: Grant
    Filed: October 15, 2020
    Date of Patent: April 19, 2022
    Assignee: CANON KABUSHIKI KAISHA
    Inventors: Tetsuo Hino, Yasuhiro Fushimoto, Norifumi Muranaka, Masafumi Kyogaku, Masaki Yamada, Hiroshi Inoue, Takumi Furukawa, Hiroaki Watanabe, Kenya Terada, Yuya Tomomizu, Toshimitsu Nakazawa
  • Patent number: 11248102
    Abstract: A roll excellent in abrasion resistance, which contains: a resin layer containing a first atom group having a plurality of sulfur atoms, a plurality of second atom groups having a carbon chain that has a plurality of carbon atoms arranged in a line and has an end bonded to any one of the plurality of sulfur atoms, and a plurality of third atom groups each of which has a urethane bond and is bonded to any one of the plurality of second atom groups; and a cylindrical foamed resin having an outer surface covered with the resin layer.
    Type: Grant
    Filed: December 9, 2016
    Date of Patent: February 15, 2022
    Assignee: INOAC TECHNICAL CENTER CO.. LTD.
    Inventors: Takayuki Suzuki, Minoru Ubukata, Takuya Ito
  • Patent number: 11194266
    Abstract: Provided are a developing roll for an electrophotographic device and a method for manufacturing a developing roll for an electrophotographic device, with which toner fusion and toner filming are suppressed. A developing roll for an electrophotographic device includes a shaft body and an elastic body layer formed on an outer circumference of the shaft body. The surface of the elastic body layer has a plurality of large protruding parts having a width of 3.0 to 12 ?m and a height of 3.0 to 12 ?m, and the side surface of the large protruding part 16 has a plurality of small protruding parts which form convex-concavity having a ten-point average roughness Rz of 2.0 to 4.0 ?m.
    Type: Grant
    Filed: April 8, 2021
    Date of Patent: December 7, 2021
    Assignee: Sumitomo Riko Company Limited
    Inventors: Tatsuya Kibayashi, Yoshihiro Saito
  • Patent number: 11175602
    Abstract: An electroconductive member for electrophotography has an electroconductive support and an electroconductive layer in the order mentioned. The electroconductive layer has a matrix including a crosslinked product of a first rubber, and a domain including a crosslinked product of a second rubber and an electroconductive particle. The impedance of an outer surface of the electroconductive member is 1.0×103 to 1.0×108?. 80% by number or more of domains observed at each of a total of nine 15-?m square observation regions, which are disposed at any three points in a thickness region from the outer surface to a specific depth on each of cross sections in a thickness direction at three points: the center of the electroconductive layer in the longitudinal direction and points at a specific distance from both edges of the electroconductive layer toward the center, satisfy specific requirements.
    Type: Grant
    Filed: October 16, 2020
    Date of Patent: November 16, 2021
    Assignee: CANON KABUSHIKI KAISHA
    Inventors: Satoru Nishioka, Masahiro Kurachi, Kenji Takashima, Yuichi Kikuchi, Kazuhiro Yamauchi, Kana Sato, Takumi Furukawa, Hiroaki Watanabe, Kenya Terada, Yuya Tomomizu, Toshimitsu Nakazawa
  • Patent number: 11111380
    Abstract: The invention relates to a composition for production of a thermoplastic moulding compound, wherein the composition comprises or consists of the following constituents, A) at least one polymer selected from the group consisting of aromatic polycarbonate, aromatic polyester carbonate and aromatic polyester, B) polymer free of epoxy groups, consisting of B.1) rubber-modified vinyl (co)polymer prepared by the emulsion polymerization method and B.2) optionally, a rubber-free vinyl (co)polymer, C) a block or graft polymer comprising structural elements deriving from styrene and at least one epoxy-comprising vinyl monomer, D) one or more further additives, and to a process for producing a moulding compound from the composition, to the moulding compound itself, to the use of the composition or the moulding compound for production of mouldings, and to the mouldings themselves.
    Type: Grant
    Filed: December 22, 2017
    Date of Patent: September 7, 2021
    Assignee: Covestro Deutschland AG
    Inventors: Andreas Seidel, Sven Hobeika, Ralf Hufen, Thomas Eckel
  • Patent number: 11112719
    Abstract: Provided is a process cartridge in which lateral running is suppressed while satisfactory potential fluctuation is maintained. The process cartridge includes: an electrophotographic photosensitive member including a support, a lowermost layer, and a photosensitive layer; and a charging member including a support and a conductive layer. In a case where a maximum frequency at which a phase of an impedance reaches 45°, when the impedance is measured by applying an AC voltage to the lowermost layer while changing the AC voltage, is represented by fOPC (Hz), and in a case where a maximum frequency at which a phase of an impedance reaches 45°, when the impedance is measured by applying an AC voltage to the charging member while changing the AC voltage, is represented by fC (Hz), the fOPC and the fC each have a value within a certain range.
    Type: Grant
    Filed: October 7, 2020
    Date of Patent: September 7, 2021
    Assignee: CANON KABUSHIKI KAISHA
    Inventors: Kohei Makisumi, Kaname Watariguchi, Fumiyuki Hiyama, Kazuhiro Yamauchi, Yuichi Kikuchi
  • Patent number: 11106151
    Abstract: In a charging roll for electrophotographic equipment, an outer surface layer of an elastic layer includes a binder resin, large-diameter particles having an average particle diameter of 15-50 ?m, and small-diameter particles having an average particle diameter of 3-15 ?m, a difference in average particle diameter between the large-diameter particles and the small-diameter particles is 10-35 ?m, the small-diameter particles are arranged in one layer in the surface layer, the average distance between the small-diameter particles is not more than 1.2 times the average particle diameter of the small-diameter particles, the thickness a of the binder resin covering the large-diameter particles is within the range of 1.5-3.5 ?m, the thickness b of the binder resin covering the small-diameter particles is 3.0-6.0 ?m, and the thickness b is larger than the thickness a.
    Type: Grant
    Filed: February 3, 2021
    Date of Patent: August 31, 2021
    Assignee: Sumitomo Riko Company Limited
    Inventors: Yoshihiro Saito, Hiroshi Ukai
  • Patent number: 11086247
    Abstract: An assembly for an electrophotographic image forming device according to one example includes a rotatable roll having an electrically conductive shaft. An electrically conductive bracket is positioned adjacent to the roll and in a spaced relationship from the roll along a length of the roll. An electrical contact is positioned to receive an electrical voltage from a power supply of the image forming device. The electrical contact is electrically connected to a first end portion of the shaft of the roll by way of a first electrical path and to a second end portion of the shaft of the roll by way of a second electrical path to transfer the electrical voltage to the roll. The bracket forms a portion of the second electrical path such that the electrical voltage transferring from the electrical contact to the second end portion of the shaft of the roll passes through the bracket.
    Type: Grant
    Filed: October 28, 2020
    Date of Patent: August 10, 2021
    Assignee: Lexmark International, Inc.
    Inventor: Jeffrey Lawrence Tonges
  • Patent number: 11061342
    Abstract: An electrophotographic apparatus comprising an electrophotographic photosensitive member, a charging device, and a developing device, wherein the charging device comprises a conductive member arranged to be capable of contacting the electrophotographic photosensitive member, a conductive layer on the conductive member outer surface comprises a matrix and a plurality of domains dispersed in the matrix, at least some of the domains are exposed at the conductive member outer surface, the matrix has a volume resistivity of larger than 1.00×1012 ?·cm and is 1.0×105 times or more one of the domains, the developing device comprises the toner comprising a toner particle, fine particles A and B, the fine particle A has a volume resistivity of 1.0×103 to 1.0×1010 ?·cm, and the fine particle B is silica fine particle and having a volume resistivity of 1.0×1011 to 1.0×1017 ?·cm.
    Type: Grant
    Filed: October 15, 2020
    Date of Patent: July 13, 2021
    Assignee: CANON KABUSHIKI KAISHA
    Inventors: Noriyoshi Umeda, Tsuneyoshi Tominaga, Shohei Tsuda, Shohei Kototani, Masahiro Kurachi, Kazuhiro Yamauchi, Hideo Kihara
  • Patent number: 10996601
    Abstract: A charging device includes a charging roller, a cleaning roller, a pair of first supporting members, a pair of second supporting members and a pair of elastic members. The pair of first supporting members supports the charging roller in a rotatable manner. The pair of second supporting members supports the cleaning roller in a rotatable manner. The pair of elastic members is disposed between the first supporting members and the second supporting members, and pushes back the cleaning roller in a direction separate away from the charging roller. The second supporting member provided on one side in an axial direction of the cleaning roller has a roller-shift preventing part which blocks the cleaning roller. The elastic member provided on the one side in the axial direction pushes back the cleaning roller with force smaller than force of the elastic member provided on the other side in the axial direction.
    Type: Grant
    Filed: June 29, 2020
    Date of Patent: May 4, 2021
    Assignee: KYOCERA Document Solutions Inc.
    Inventor: Ryo Taniguchi
  • Patent number: 10866552
    Abstract: An image forming apparatus includes a developing cartridge, a drum cartridge, a casing, a connector, and a controller. The drum cartridge includes a photosensitive drum, a drum cartridge memory, a charger, and a cleaner. The charger is configured to charge the photosensitive drum and including a wire and a grid electrode. The cleaner is configured to clean the wire. The connector is configured to be electrically connected to the drum cartridge memory. Information is writable to the drum memory through the connector. The detection circuit board is configured to detect a state of discharge of the charger. The controller is configured to perform: determining whether or not the state of discharge detected by the detection circuit board is abnormal; and writing, in the drum cartridge memory, information representing occurrence of the abnormal discharge through the connector in a case where occurrence of the abnormal discharge is determined.
    Type: Grant
    Filed: March 25, 2019
    Date of Patent: December 15, 2020
    Assignee: BROTHER KOGYO KABUSHIKI KAISHA
    Inventor: Fumitake Tajiri
  • Patent number: 10824087
    Abstract: A charging member includes a conductive substrate, an elastic layer disposed on the conductive substrate, and a surface layer disposed on the elastic layer. Regarding the surface of the surface layer, in the axial direction, the ratio of the mean spacing of profile irregularities Sm to the ten-point mean roughness Rz and the reduced peak height Spk respectively satisfy 15?Sm/Rz?35 and Spk?5 ?m.
    Type: Grant
    Filed: July 22, 2019
    Date of Patent: November 3, 2020
    Assignee: FUJI XEROX CO., LTD.
    Inventors: Yasuhiko Kinuta, Shogo Tomari, Hiroko Kobayashi, Kosuke Narita
  • Patent number: 10684582
    Abstract: A pressing member for fixing includes: an axial section; a cylindrical body that includes the axial section internally inserted, rotates following rotation of the axial section, and is extendable in an axial direction relative to the axial section; and an elastic layer that is stacked on an outer circumference of the cylindrical body.
    Type: Grant
    Filed: February 6, 2019
    Date of Patent: June 16, 2020
    Assignee: FUJI XEROX CO., LTD.
    Inventor: Issei Fujihara
  • Patent number: 10571822
    Abstract: An object of the present invention is to provide a charging roller in which detachment of particles from a surface layer as well as abrasion and scraping of the particles, which are caused by contact and the like with other member such as a photoreceptor during the use, are unlikely to occur. The charging roller includes: a shaft 1; and an elastic layer 2 and a surface layer 3, which are sequentially formed on the outer circumference of the shaft 1. The surface layer 3 is composed of a mixture of a surface layer resin composition and particles, the surface layer resin composition has a tensile elongation at break of 51% or greater, and the particles have a reaction force of 1.0 to 10.3 mN under 1-?m compression.
    Type: Grant
    Filed: February 1, 2017
    Date of Patent: February 25, 2020
    Assignee: BRIDGESTONE CORPORATION
    Inventor: Takehiro Sano
  • Patent number: 10571838
    Abstract: A controller of an image forming apparatus executes acquisition processing of acquiring an area of an image which exists in a predetermined region of a first page where a developer image is first to be formed, heating processing of heating a heating member such that a temperature of the heating member reaches a fixing temperature, and feeding processing of starting feed of a sheet to a process unit after a predetermined period of time elapses from a predetermined timing after a start of print processing. The predetermined region is laid at both end portions in a width direction of the first page. In a case where the area of the image is equal to or smaller than a predetermined value, the controller sets the predetermined period of time in the feeding processing shorter as compared with a case where the area of the image is larger than the predetermined value.
    Type: Grant
    Filed: February 25, 2019
    Date of Patent: February 25, 2020
    Assignee: BROTHER KOGYO KABUSHIKI KAISHA
    Inventors: Fumitake Tajiri, Yusuke Mizuno, Tatsuya Koyama, Hisashi Tsukawaki
  • Patent number: 10558149
    Abstract: A roller for electrophotography that has a low electric resistance value and that is still further reduced in contaminating property of other member is provided. The roller includes an electro-conductive mandrel and a surface layer having an electro-conductive foam. The electro-conductive foam includes a vulcanized product of an unvulcanized rubber composition including an acrylonitrile-butadiene rubber and a hydrin rubber. The vulcanized product has a matrix-domain structure having a sea phase and an island phase, contains ethylene oxide of 8.0% by mass or more and 20.0% by mass or less based on a total amount of the vulcanized product, and has a spin-spin relaxation time T2 of 750 ?s<T2<930 ?s.
    Type: Grant
    Filed: April 20, 2018
    Date of Patent: February 11, 2020
    Assignee: CANON KABUSHIKI KAISHA
    Inventors: Hirobumi Takahashi, Yoshimasa Sawada, Shoji Inoue
  • Patent number: 10558136
    Abstract: A charging member including an electro-conductive support; and an elastic layer, the elastic layer is a surface layer thereof and is constituted by a mono layer, the elastic layer includes domains and a matrix, an outer surface of the charging member is constituted by a surface of the matrix and surfaces of the domains, and the charging member has concave portions on the outer surface, the domains exist at bottom portions of the respective concave portions and are exposed to the outer surface of the charging member only at the bottom portions of the respective concave portions, the elastic layer has a volume resistivity of 1×105 ?cm or more and 1×108 ?cm or less, and A2 is 20 times or more of A1, wherein A1 and A2 are current values obtained by a prescribed method.
    Type: Grant
    Filed: April 2, 2019
    Date of Patent: February 11, 2020
    Assignee: CANON KABUSHIKI KAISHA
    Inventors: Takumi Furukawa, Hiroaki Watanabe, Kenya Terada, Yuya Tomomizu, Toshimitsu Nakazawa
  • Patent number: 10551763
    Abstract: An image forming apparatus includes a photosensitive member, a charging roller, a cleaning roller, an urging member and an image forming portion. The charging roller has an outermost surface layer including an electroconductive resin material, first surface particles having an average particle size of more than 7 ?m and less than 30 ?m and second surface particles having an average particle size of more than 2 ?m and less than 6 ?m. The first and second surface particles are dispersed in the electroconductive resin material so as to form first projections and second projections, respectively. The cleaning roller cleaning roller includes a shaft portion and an elastic cleaning portion extending helically around the shaft portion and having a rectangular cross-section perpendicular to an extending direction thereof.
    Type: Grant
    Filed: June 12, 2018
    Date of Patent: February 4, 2020
    Assignee: Canon Kabushiki Kaisha
    Inventors: Michihiro Yoshida, Takeshi Fujino, Kota Mori, Yuya Nagatomo, Jiro Kinokuni
  • Patent number: 10538109
    Abstract: A scanning path of light includes a synchronization detection area A where a synchronization detection sensor 47 detects scanning light and an image writing area B where writing of the image data to a photosensitive drum 11 is performed by the scanning light, and a light amount change unit 100 is configured to reduce a change amount of a light amount in the synchronization detection area A as compared with the image writing area B.
    Type: Grant
    Filed: January 25, 2017
    Date of Patent: January 21, 2020
    Assignee: KYOCERA DOCUMENT SOLUTIONS INC.
    Inventor: Issei Nakano
  • Patent number: 10520845
    Abstract: Provided are a charging member coupleable to an electrophotographic imaging apparatus. The charging member includes an electrically-conductive support body, an electrically-conductive elastomer layer stacked on a surface of the electrically-conductive support body, and an electrically-conductive resin layer stacked as an outermost layer on the electrically-conductive elastomer layer. The electrically-conductive resin layer includes a binder resin and particles comprising at least one type of particles selected from resin particles and inorganic particles, wherein a relative dielectric constant (?r1) of the binder resin is greater than or about equal to a relative dielectric constant (?r2) of at least one type of particles.
    Type: Grant
    Filed: May 25, 2018
    Date of Patent: December 31, 2019
    Assignee: HP PRINTING KOREA CO., LTD.
    Inventor: Noriaki Kuroda
  • Patent number: 10488780
    Abstract: An imaging device includes a photoconductive drum charged by a charge roll and opposed by a transfer roll to transfer an image from the drum. The drum becomes biased to a negative voltage by setting charges of negative voltage on both the charge roll and transfer roll. A controller switches the bias of the transfer roll to a positive voltage from the negative voltage and a delta or difference in a charge of the drum is determined from before and after the switching. Based on the delta, the voltage on the charge roll is boosted by a boost voltage to improve the charge on the drum. In this way, deteriorating or defective charge rolls can be still used to charge the drum to a proper voltage for imaging. Techniques for determining the delta, the boost and the magnitude of voltage charges are further embodiments.
    Type: Grant
    Filed: May 21, 2019
    Date of Patent: November 26, 2019
    Assignee: LEXMARK INTERNATIONAL, INC.
    Inventors: Michael Brian Bacelieri, Douglas Anthony Able, Andrew Pryse Dale, Jared Kuohui Lin, Robert Watson McAlpine, Matthew Russell Smither
  • Patent number: 10488790
    Abstract: A control unit can execute regulation control referred to as active transfer voltage control (ATVC) for setting a transfer voltage output from a second voltage unit to a transfer member so as to transfer a toner image from a photosensitive member to a transfer material based on an electric current value detected by a detection unit and a voltage value output from a voltage output unit. When changing a voltage value output from the voltage output unit during execution of the ATVC, the control unit interrupts execution of a predetermined operation of the ATVC in a predetermined time period including a point of time including when the voltage output from the voltage output unit is changed.
    Type: Grant
    Filed: November 21, 2018
    Date of Patent: November 26, 2019
    Assignee: Canon Kabushiki Kaisha
    Inventor: Shimpei Ishikawa
  • Patent number: 10466611
    Abstract: An object of the present invention is to provide a charging roller in which detachment of particles from a surface layer as well as abrasion and scraping of the particles, which are caused by contact and the like with other member such as a photoreceptor during the use, are unlikely to occur. The charging roller includes: a shaft 1; and an elastic layer 2 and a surface layer 3, which are sequentially formed on the outer circumference of the shaft 1. The surface layer 3 is composed of a mixture of a surface layer resin composition and particles, the surface layer resin composition has a tensile elongation at break of 51% or greater, and the particles have a reaction force of 1.0 to 10.3 mN under 1-?m compression.
    Type: Grant
    Filed: February 1, 2017
    Date of Patent: November 5, 2019
    Assignee: BRIDGESTONE CORPORATION
    Inventor: Takehiro Sano
  • Patent number: 10423120
    Abstract: A cartridge includes a photosensitive member, a roller including a core metal shaft and a coating layer, roller supporting portions, and a regulating portion for regulating a position of the roller with respect to a longitudinal direction of the roller. The roller supporting portions are provided so as to support one end portion and an other end potion of the core metal shaft, respectively, with respect to a direction of a rotational axis of the roller. The roller is further provided with cylindrical holes disposed at respective ends of the core metal shaft with respect to the direction of the rotational axis and extending in the direction of the rotational axis with the rotational axis as a center. The roller is supported by the roller supporting portions at inner peripheral surfaces of the holes.
    Type: Grant
    Filed: February 16, 2017
    Date of Patent: September 24, 2019
    Assignee: Canon Kabushiki Kaisha
    Inventors: Koji Yamaguchi, Hiroomi Matsuzaki
  • Patent number: 10401779
    Abstract: A charge roller includes, in a surface thereof, recesses that have sizes that are equivalent to or larger than a volume average particle diameter of a toner accommodated in a developing unit and that are capable of collecting the toner retransferred to a photosensitive drum.
    Type: Grant
    Filed: August 3, 2018
    Date of Patent: September 3, 2019
    Assignee: Canon Kabushiki Kaisha
    Inventors: Shinji Katagiri, Tsuguhiro Yoshida, Shuichi Tetsuno, Takayuki Tanaka, Takahiro Ikeda, Satoru Motohashi, Takumi Furukawa
  • Patent number: 10365575
    Abstract: A charging member includes a cylindrical, hollow or solid, electroconductive base member, and an elastic layer device disposed on the electroconductive base member. When a surface profile of the charging member is subjected to a periodicity analysis in a circumferential direction, the surface profile has a maximum amplitude, in a period region of smaller than 5 mm, within a range of higher than or equal to 0.20 ?m and smaller than or equal to 0.90 ?m.
    Type: Grant
    Filed: September 28, 2017
    Date of Patent: July 30, 2019
    Assignee: FUJI XEROX CO., LTD.
    Inventors: Yasuhiko Kinuta, Takuya Yamamoto, Yuki Tagawa
  • Patent number: 10365574
    Abstract: An image carrying member unit has an image carrying member, a charging member, a pair of first bearing members, a biasing member, and a supporting frame. The image carrying member is rotatable, and an electrostatic latent image is formed on it. The charging member is arranged in contact or close to the image carrying member, and electrostatically charges the image carrying member. The first bearing members support the charging member movably in directions to and away from the image carrying member. The biasing member biases the charging member toward the image carrying member. The supporting frame supports the image carrying member and the first bearing members. The first bearing members each have a fulcrum rotatably supported on the supporting frame, an arm extending radially from the fulcrum, and a bearing portion formed at a tip end of the arm and supporting axially either end of the charging member.
    Type: Grant
    Filed: August 28, 2018
    Date of Patent: July 30, 2019
    Assignee: KYOCERA DOCUMENT SOLUTIONS INC.
    Inventor: Hiroki Morishita
  • Patent number: 10338493
    Abstract: A developing roller (1) is provided, which includes a tubular porous inner layer (2) of a foamed product of a semiconductive rubber composition containing an ethylene propylene rubber and a paraffin oil, and an outer layer (4) of a seamless tube of a semiconductive thermoplastic polyamide elastomer provided on an outer peripheral surface (3) of the inner layer (2), and has an overall Asker-C hardness of not less than 30 degrees and not greater than 60 degrees. A production method is also provided, which includes the steps of: preparing a tube having a thickness T of 100 to 400 ?m and having an inner diameter D2 for an outer layer; preparing a tubular inner layer having an outer diameter D1; and press-inserting the inner layer into the tube; wherein an interference represented by a difference D1- D2 between the outer diameter D1 of the inner layer and the inner diameter D2 of the tube is 100 to 400 ?m.
    Type: Grant
    Filed: December 7, 2016
    Date of Patent: July 2, 2019
    Assignee: SUMITOMO RUBBER INDUSTRIES, LTD.
    Inventor: Yuta Imase
  • Patent number: 10310402
    Abstract: An image forming apparatus includes a photosensitive member having a surface having elastic deformation power of 47% or more, a charging roller forming a nip between itself and the photosensitive member, and an image forming portion. When a nip region corresponding to the nip is formed and then an area of independent contact portions between the charging member and a measuring contact member is measured, the following relationship is satisfied: (contact width X)×(Contact area ratio ?)?0.1, where a length from a position of one end to a position of the other end of the nip region with respect to a direction perpendicular to a longitudinal direction of the charging roller is the contact width X, and a ratio of a sum of areas of the independent contact portions to an entire area of a measuring region is the contact area ratio ?.
    Type: Grant
    Filed: June 13, 2018
    Date of Patent: June 4, 2019
    Assignee: Canon Kabushiki Kaisha
    Inventors: Jiro Kinokuni, Kota Mori, Yuya Nagatomo, Michihiro Yoshida, Takeshi Fujino
  • Patent number: 10289019
    Abstract: An image forming apparatus configured to, in a case where a difference between a charging current flowing through a first charging roller and a charging current flowing through a second charging roller is larger than a first threshold value, perform first cleaning processing in which a cleaning ability of one cleaner of a first cleaner and a second cleaner, which corresponds to one of the first charging roller and the second charging roller, is lower than a cleaning ability of another cleaner of the first cleaner and the second cleaner, which corresponds to another of the first charging roller and the second charging roller, a charging current flowing through the one charging roller being larger than a charging current flowing through the other charging roller.
    Type: Grant
    Filed: March 28, 2018
    Date of Patent: May 14, 2019
    Assignee: Brother Kogyo Kabushiki Kaisha
    Inventors: Hotaka Kakutani, Kazutoshi Kotama, Chieko Mimura, Kengo Yada, Shota Iriyama
  • Patent number: 10268133
    Abstract: This conductive roll includes: at least one elastic layer 12 including primarily a conductive rubber body and provided along the outer periphery of a core 11; and a coating layer 14 provided along the outer periphery of the elastic layer 12. The conductive roll satisfies the following expressions: circumference Sm1?135 ?m and circumference Sm1<circumference Sm2 wherein circumference Sm1 represents an average interval Sm of irregularities along the circumferential direction of the elastic layer 12, and circumference Sm2 represents an average interval Sm of irregularities along the circumferential direction of the coating layer 14.
    Type: Grant
    Filed: August 1, 2017
    Date of Patent: April 23, 2019
    Assignees: NOK CORPORATION, SYNZTEC CO., LTD., NOK KLUEBER CO., LTD.
    Inventors: Kousuke Oura, Hiroshi Ogura, Masaki Tahara
  • Patent number: 10268132
    Abstract: A charging roller includes a surface layer containing first and second surface particles and satisfying the following: 6.0 (?m)?Rz?18.8 (?m),??i where Rz is a ten-point average roughness (?m) of a charging roller surface, 7 (?m)?d?20 (?m),??ii where d is a thickness (?m) of the surface layer, 9.8 (?m)?D1?15.8 (?m) and 2.8 (?m)?D2?5.2 (?m),??iii where D1 and D2 are average particle size (?m) of the first surface particles, and the second surface particles, respectively, 3.0?D1/D2?5.6, and??iv 0.10?M1/(M1+M2)?0.32,??v where M1 is a total weight (mg) of the first surface particles per unit area of the charging roller surface, and M2 is a total weight (mg) of the second surface particles per unit area of the charging roller surface.
    Type: Grant
    Filed: June 11, 2018
    Date of Patent: April 23, 2019
    Assignee: CANON KABUSHIKI KAISHA
    Inventors: Takeshi Fujino, Kota Mori, Yuya Nagatomo, Michihiro Yoshida, Jiro Kinokuni
  • Patent number: 10248042
    Abstract: The electrophotographic roller has a surface layer comprising an electro-conductive elastic layer on an electro-conductive substrate. The opening of a bowl-shaped resin particle is exposed on the surface of the electrophotographic roller. The number of contact portions of the convex portion with the glass plate in a square region where a length of a nip in a direction along the circumferential direction of the electrophotographic roller of a nip formed by pressing the roller on the glass plate with a specific load applied as the length of one side and is located at any position in the nip is 8 or more. The average value of the areas of the contact portions is 10 ?m2 to 111 ?m2. The variation coefficient of the areas of the contact portions and the variation coefficient D of the areas of a plurality of Voronoi regions each including a contact portion satisfy specific relationships.
    Type: Grant
    Filed: May 29, 2018
    Date of Patent: April 2, 2019
    Assignee: CANON KABUSHIKI KAISHA
    Inventors: Atsushi Uematsu, Mototeru Goto, Masataka Kodama
  • Patent number: 10209642
    Abstract: A charge roller in an image-forming apparatus of a DC electrification mode mitigates occurrence of black lines and prevents fogging. The charge roller has a core, an elastic layer on the core, and a surface treatment layer on the surface of the elastic layer. The elastic layer is a vulcanized rubber composition containing a rubber base mainly containing an epichlorohydrin-based rubber, and additives including a conductivity-imparting agent, an inorganic filler, a vulcanization accelerator, and a vulcanizing agent. The ratio of the conductivity-imparting agent and the inorganic filler, to the entire rubber composition, is 11 mass % or less. The surface treatment layer is formed by impregnating the elastic layer with a surface treatment liquid prepared by dissolving an isocyanate compound in an organic solvent. The roller has a roller surface roughness Rz of 10 ?m or less.
    Type: Grant
    Filed: December 6, 2017
    Date of Patent: February 19, 2019
    Assignee: SYNZTEC CO., LTD.
    Inventors: Yuka Moriyasu, Hiroshi Ogura, Tomohiro Murata
  • Patent number: 10191405
    Abstract: The present teachings describe a bias charging member. The charging member includes a conductive core and an outer surface layer disposed on the conductive core. The outer surface layer includes a crosslinked hydroxyl terminated poly(oxetane) based fluorinated polyether and an aminoplast resin.
    Type: Grant
    Filed: November 11, 2016
    Date of Patent: January 29, 2019
    Assignee: Xerox Corporation
    Inventors: Jin Wu, Lin Ma
  • Patent number: 10191404
    Abstract: A charging member is provided having an electroconductive substrate, and a resin layer on the substrate, in which the charging member has an area on the surface of the charging member, the area including a compound represented by the following formula (1),
    Type: Grant
    Filed: October 20, 2015
    Date of Patent: January 29, 2019
    Assignee: Canon Kabushiki Kaisha
    Inventors: Kenichi Yamauchi, Masataka Kodama, Noriko Suzumura
  • Patent number: 10162284
    Abstract: A developing device includes a container that contains developer; a rotating body that rotates while carrying the developer and supplies the developer to a latent image formed on an image carrier; a channel through which air in the container is discharged out of the container; a first member that is positioned downstream of a position at which the developer is separated from the rotating body in a rotation direction of the rotating body and with which the developer separated from the rotating body comes into contact; and a second member that is positioned downstream of the first member in the rotation direction of the rotating body and with which the developer separated from the rotating body comes into contact.
    Type: Grant
    Filed: October 17, 2017
    Date of Patent: December 25, 2018
    Assignee: FUJI XEROX CO., LTD.
    Inventors: Shinichi Kuramoto, Yoshitaka Nakajima, Ayumi Noguchi
  • Patent number: 10125236
    Abstract: To provide an elastic roll for an electro-photographic apparatus that includes an elastic body layer having a low hardness and being excellent in fatigue resistance, and thus is resistant to fatigue, and to provide a method for manufacturing the same. An elastic roll 10 for an electrophotographic apparatus includes a shaft body 12, and a foamed elastic body layer 14 provided on an outer periphery of the shaft body 12, wherein the foamed elastic body layer 14 consists of a silicone rubber foamed body including a plurality of air bubbles 18 in its base material containing cross-linked silicone rubber and a reinforcement material, and wherein the foamed elastic body layer has a communication degree of 40% or more. It is preferable that the elastic roll 10 should further include a skin layer 14a in the foamed elastic body layer 14 on an outer peripheral side.
    Type: Grant
    Filed: February 22, 2018
    Date of Patent: November 13, 2018
    Assignee: SUMITOMO RIKO COMPANY LIMITED
    Inventors: Ryosuke Yamaoka, Yasunori Nimura, Takahiro Morita, Satoshi Tatsumi, Kousuke Minematsu, Junichiro Suenaga
  • Patent number: 10101690
    Abstract: An image forming apparatus includes an image bearer including a first image portion to bear a first toner image, a second image portion to bear a second toner image, and a non-image portion to bear an adjustment pattern. A transferor forms a transfer nip with the image bearer. A controller controls the power source to output an image bias as a transfer bias to transfer the first toner image and the second toner image onto a first recording medium and a second recording medium, respectively, in the transfer nip when the first image portion and the second image portion pass through the transfer nip and output a non-image bias as the transfer bias when the non-image portion passes through the transfer nip. The controller performs a constant current control on the image bias and performs a constant voltage control when the image bias switches to the non-image bias.
    Type: Grant
    Filed: May 16, 2017
    Date of Patent: October 16, 2018
    Assignee: Ricoh Company, Ltd.
    Inventors: Kenji Sugiura, Naohiro Kumagai, Seiichi Kogure, Junpei Fujita, Kazuki Yogosawa, Yuuji Wada, Jyunya Sakuraba
  • Patent number: 10078287
    Abstract: Provided is an image forming apparatus capable of appropriately setting a range of a charging voltage for electrically charging an image bearing member. A charging roller (2) and a charging power source (S1) are configured to apply a voltage between the charging roller (2) and a photosensitive drum (1) to electrically charge the photosensitive drum (1). A control circuit (13) is configured to set a voltage for obtaining a predetermined discharge current by the charging roller (2) with the photosensitive drum (1). The control circuit (13) is configured to determine, depending on a state of a resistance acting on an electric current flowing between the charging roller (2) and the photosensitive drum (1), at least one of an upper limit or a lower limit of the voltage set by the control circuit (13).
    Type: Grant
    Filed: December 2, 2015
    Date of Patent: September 18, 2018
    Assignee: CANON FINETECH NISCA INC.
    Inventor: Yuki Nagahashi
  • Patent number: 10025215
    Abstract: A charging member includes a support member, and a surface layer which is provided on the support member and contains a non-conductive porous filler particle and a conductive material present in pores of the non-conductive porous filler particle. The charging member may be included in a process cartridge that is detachable from an image forming apparatus.
    Type: Grant
    Filed: May 4, 2017
    Date of Patent: July 17, 2018
    Assignee: FUJI XEROX CO., LTD.
    Inventor: Takuya Morishige
  • Patent number: 10025216
    Abstract: Provided is a charging member capable of suppressing the occurrence of an image defect due to the non-uniform abrasion of a photosensitive member and a stain, in a long-term use. The charging member includes an electro-conductive elastic layer as a surface layer. The electro-conductive elastic layer contains a binder and a bowl-shaped resin particle having an opening. The surface of the charging member has a concavity and a protrusion derived from the bowl-shaped resin particle. The relations represented by the following formulae are satisfied, 0.2 ? S = ? S ? ? 5 - S ? ? 1 ? S ? ? 1 ? 0.5 0.15 ? d = ? d ? ? 5 - d ? ? 1 ? d ? ? 1 ? 0.
    Type: Grant
    Filed: March 30, 2016
    Date of Patent: July 17, 2018
    Assignee: Canon Kabushiki Kaisha
    Inventors: Atsushi Uematsu, Tomohito Taniguchi, Masahiro Watanabe, Noboru Miyagawa, Taichi Sato, Takehiko Aoyama