Control Of Transfer Patents (Class 399/66)
  • Patent number: 10705447
    Abstract: An image forming system includes first and second apparatuses. The first image forming apparatus includes a first image forming unit and a first transfer unit. The first image forming unit forms an image of at least one color. The first transfer unit transfers the formed image to a recording medium. The second image forming apparatus includes a second image forming unit and a second transfer unit. The second image forming unit forms an image different in at least a part of colors from the first image forming apparatus. The second transfer unit transfers the formed image to the recording medium on which the image has been formed by the first image forming apparatus. A total resistance of the second transfer unit along a direction in which a transfer current flows is larger than that of the first transfer unit.
    Type: Grant
    Filed: August 14, 2019
    Date of Patent: July 7, 2020
    Assignee: FUJI XEROX CO., LTD.
    Inventor: Osamu Handa
  • Patent number: 10691052
    Abstract: In the first charge amount acquisition operation, based on density of a plurality of toner images for measurement or based on a direct component of a developing current at the time of forming the plurality of toner images in addition to the density of the plurality of toner images for measurement, the charge amount acquisition section acquires a first toner charge amount that is a charge amount of toner included in the toner image for measurement. In the second charge amount acquisition operation, based on the toner density detected at the time of image formation and a relationship between the first toner charge amount and the toner density detected in the first charge amount acquisition operation, the charge amount acquisition section acquires a second toner charge amount that is a charge amount of the toner in the development device.
    Type: Grant
    Filed: August 28, 2019
    Date of Patent: June 23, 2020
    Assignee: KYOCERA Document Solutions Inc.
    Inventors: Tamotsu Shimizu, Akifumi Yamaguchi, Yasuhiro Tauchi, Kenichi Tamaki, Koji Suenami
  • Patent number: 10656580
    Abstract: An image forming apparatus includes an image bearing drum; a drum charging member, disposed at a charging position opposed to the drum, for applying the drum with a charging bias; a developing member for developing an electrostatic image formed on the drum with toner, with a developing bias; a transfer member for transferring a toner image from the drum onto a sheet, with a transfer bias; a transfer bias source for outputting the transfer bias; and a controller for effecting control to start raising of the transfer bias so as to correspond to a timing at which an area of the drum passing at a timing of starting of raising of the charging bias passes the transfer position and to complete the raising of the transfer bias so as to correspond to a timing at which an area of the drum passing at a timing of completion of raising of the charging bias passes the transfer position.
    Type: Grant
    Filed: June 15, 2017
    Date of Patent: May 19, 2020
    Assignee: Canon Kabushiki Kaisha
    Inventors: Satoshi Ogawara, Takashi Uehara
  • Patent number: 10627749
    Abstract: A voltage maintenance element is connected to a contact member that contacts a primary transfer surface area of an intermediate transfer belt to which toner images are transferred from a plurality of image carriers between stretch members, in such a way as to prevent the electric potential of the intermediate transfer belt from varying between respective image forming stations.
    Type: Grant
    Filed: December 17, 2018
    Date of Patent: April 21, 2020
    Assignee: Canon Kabushiki Kaisha
    Inventors: Shinji Katagiri, Yuji Kawaguchi, Masaru Ohno, Tsuguhiro Yoshida, Takeo Kawanami, Taro Minobe, Masaru Shimura
  • Patent number: 10627746
    Abstract: An image forming device of an intermediate transfer method of transferring a toner image formed on an image carrier to a sheet of paper through an intermediate transfer body, the image forming device including a transfer roller which is disposed facing the image carrier across the intermediate transfer body, and which forms a nip part with the image carrier; a movement mechanism which moves the transfer roller in a direction along a movement direction of the intermediate transfer body; a pressure varying mechanism which changes a pressing force of the transfer roller on the intermediate transfer body; and a hardware processor which controls the movement mechanism and the pressure varying mechanism, and which sets a contact position and the pressing force of the transfer roller on the intermediate transfer body based on paper information of the sheet of paper as an image formation target.
    Type: Grant
    Filed: April 17, 2019
    Date of Patent: April 21, 2020
    Assignee: KONICA MINOLTA, INC.
    Inventor: Daisuke Murakami
  • Patent number: 10599081
    Abstract: An image forming apparatus includes a latent image bearer to bear a latent image, a potential sensor having a vibrator driven by a drive frequency to detect a surface potential of the latent image bearer, a developer bearer to bear developer that develops the latent image on the latent image bearer, and a power supply to apply a superimposed voltage obtained by superimposing an alternating voltage on a direct current voltage on the developer bearer. The frequency of the alternating voltage is not a multiple of the drive frequency and is a value obtained by adding a predetermined value to a multiple of the driving frequency.
    Type: Grant
    Filed: August 14, 2018
    Date of Patent: March 24, 2020
    Assignee: Ricoh Company, Ltd.
    Inventors: Masashi Tachi, Takuma Higa, Masayoshi Nakayama, Masaki Sukesako, Tomohide Takenaka, Yuichi Aizawa, Kazuaki Kamihara, Keita Sone
  • Patent number: 10591858
    Abstract: There is provided a voltage generation device for generating a voltage in which an alternating-current voltage is superimposed on a direct-current voltage, to apply the voltage to a rotary body. The voltage generation device includes a direct-current power supply, an alternating-current power supply, a variation phase determiner, and a voltage controller. The alternating-current power supply is connected to the direct-current power supply. The variation phase determiner is configured to determine whether variation of an output voltage of the alternating-current power supply and variation of an output current of the alternating-current power supply are in opposite phases. The voltage controller is configured to perform gain correction for the output voltage in a case where the variation of the output voltage and the variation of the output current are in opposite phases.
    Type: Grant
    Filed: May 20, 2019
    Date of Patent: March 17, 2020
    Assignee: Ricoh Company, Ltd.
    Inventor: Tsuyoshi Mano
  • Patent number: 10578991
    Abstract: A nip portion is formed between a transfer member and an image bearing member. During an image transfer operation, a first transfer voltage is applied so that a first charging voltage is applied to the surface of the image bearing member forming the nip portion. Before paper enters, a second transfer voltage is applied so that a third charging voltage is applied to the surface of the image bearing member forming the nip portion. A void is formed by the image bearing member, the transfer member and the paper within the nip portion. Before an image transfer operation and the void is formed, one of the first and second transfer voltages and a third transfer voltage is applied so that a second charging voltage having a same polarity as the first charging voltage and being lower in absolute value is applied to the surface of the image bearing member.
    Type: Grant
    Filed: January 17, 2019
    Date of Patent: March 3, 2020
    Assignee: CANON KABUSHIKI KAISHA
    Inventors: Shunsuke Mizukoshi, Makoto Fukatsu, Yuta Isobe, Shuhei Tokiwa
  • Patent number: 10571845
    Abstract: An image forming apparatus capable of detecting a development nip disengaging error and a method of detecting a development nip disengaging error are provided. According to an example method, a test pattern is formed on a photoconductor of an image forming apparatus, the test pattern transferred to an intermediate transfer belt is detected through a sensor from a time when an operation of an adjusting member moving a developing roller is controlled such that the developing roller moves from a disengaging position where the developing roller is spaced from the photoconductor to disengage a development nip from the photoconductor to a developing position where the developing roller is in contact with the photoconductor to form the development nip, and whether the development nip disengaging error occurred is determined based on the detected test pattern.
    Type: Grant
    Filed: January 18, 2018
    Date of Patent: February 25, 2020
    Assignee: Hewlett-Packard Development Company, L.P.
    Inventors: Sang Jin Park, Sung Min Park, Hyo Joong Kim, Jong Woo Lee, Mi Young Kim
  • Patent number: 10564582
    Abstract: A rotating member control device that controls a first rotating member and a second rotating member to convey a sheet includes a processor configured to execute a program to implement processes of controlling the first rotating member and the second rotating member to come into contact or be separated from each other and acquiring a value that corresponds to or is proportional to a driving torque of a first driving unit that rotationally drives the first rotating member. The processor acquires the value upon separation when the first rotating member and the second rotating member are separated from each other and upon conveyance when the sheet is held between and conveyed by the first rotating member and the second rotating member. The processor further sets a rotational speed of the second rotating member such that the value acquired upon separation and the value acquired upon conveyance become equal.
    Type: Grant
    Filed: June 13, 2017
    Date of Patent: February 18, 2020
    Assignee: Ricoh Company, Ltd.
    Inventors: Takafumi Seki, Hiromichi Matsuda
  • Patent number: 10558138
    Abstract: An image forming apparatus includes image forming units each of which includes an image bearing member, a contact charging member, and a developer bearing member of a toner, applies a charging bias in a direction in which the toner moves from the image bearing member to the charging member in an image forming period, and applied a charging bias of an opposite polarity relative to that in the image formation in a cleaning period, and collects the toner by the developer bearing member. In consecutive image formation, a charging bias in the image forming period is applied in a first interval period and which is between first and second image forming periods and a second interval period which is between second and third image forming periods. An absolute value of a charging bias applied in the second interval period is larger than that applied in the first interval period.
    Type: Grant
    Filed: March 25, 2019
    Date of Patent: February 11, 2020
    Assignee: Canon Kabushiki Kaisha
    Inventors: Masanori Tanaka, Kazuhiro Okubo, Takahiro Kawamoto, Yuji Kawaguchi, Jun Miura
  • Patent number: 10545434
    Abstract: In an example, a method of wetting a print blanket includes receiving a null cycle trigger during a printing session. The method also includes maintaining printing voltages on a forecast BID (binary ink developer) that has been prepared to print a next color separation onto a photoreceptor, and applying wet null voltages to a non-forecast BID. The method then includes engaging the non-forecast BID with the photoreceptor to transfer fluid other than ink to the photoreceptor during the null cycle.
    Type: Grant
    Filed: January 13, 2019
    Date of Patent: January 28, 2020
    Assignee: HP Indigo B.V.
    Inventors: Vitaly Portnoy, Michel Assenheimer, Amiran Lavon, Eric G Nelson, Amir Ofir
  • Patent number: 10532584
    Abstract: An image forming apparatus includes: a speed setting portion configured to set a rotation speed of a drive motor to one of a plurality of predetermined specific speeds; a measurement processing portion configured to, in each of a plurality of detection cycles in which light is detected after scanning by a polygon mirror, measure an interval between a detection timing of the light and an output timing at which a drive signal input to the drive motor of the polygon mirror first after the detection timing, is output; and an identification processing portion configured to identify a reference reflection surface that corresponds to a reference interval, based on the measured interval and the reference interval corresponding to a specific speed at a time when the measured interval was measured, the reference interval being among reference intervals that have been set in advance for each of the specific speeds.
    Type: Grant
    Filed: October 17, 2017
    Date of Patent: January 14, 2020
    Assignee: KYOCERA Document Solutions Inc.
    Inventor: Jun Nakai
  • Patent number: 10527983
    Abstract: An image forming method includes: supplying a powder onto a recording medium; supplying a coated toner onto the powder on the recording medium; and fixing the powder to the recording medium by heating the coated toner supplied onto the powder and melting the coated toner.
    Type: Grant
    Filed: October 26, 2018
    Date of Patent: January 7, 2020
    Assignee: KONICA MINOLTA, INC.
    Inventors: Michiyo Fujita, Makoto Nomiya, Tomomi Oshiba
  • Patent number: 10527979
    Abstract: Provided is an image forming apparatus and a control program. A fixer includes a first roller which includes an elastic layer having a predetermined thickness in a surface, a second roller which includes an elastic layer having a thickness smaller than that of the first roller in a surface, a fixing belt which is laid across the first roller and forms a fixing nip portion between the second roller and the fixing belt, and first and second drive motors that drive the first and second rollers, respectively. A hardware processor controls a drive current of the first drive motor so that an electromotive current generated in the second drive motor has a predetermined value in a case where the first roller is rotatively driven by the first drive motor and the second roller is caused to rotate as a follower of the first roller and the fixing belt.
    Type: Grant
    Filed: April 11, 2019
    Date of Patent: January 7, 2020
    Assignee: KONICA MINOLTA, INC.
    Inventor: Masahiro Onodera
  • Patent number: 10527973
    Abstract: An image forming apparatus includes an image holding unit, a transfer unit, a first-resistance detection unit, a second-resistance detection unit, and a selection unit. The image holding unit holds an image. The transfer unit includes a transfer member and a counter member. The transfer member is disposed in contact with an image holding surface of the image holding unit. The counter member is disposed across the image holding unit from the transfer member. The counter member is connected to a transfer power supply to cause a transfer electric field to act on a transfer region between the image holding unit and the transfer member. The transfer unit causes the image held by the image holding unit to be electrostatically transferred onto a recording medium transported to the transfer region. The first-resistance detection unit detects system resistance of the counter member, the image holding unit, and the transfer member.
    Type: Grant
    Filed: February 13, 2019
    Date of Patent: January 7, 2020
    Assignee: FUJI XEROX CO., LTD.
    Inventors: Masaaki Yamaura, Satoshi Shigezaki, Toshiaki Baba, Yoshiyuki Tominaga, Jun Kuwabara
  • Patent number: 10527977
    Abstract: Provided is an image forming apparatus including a transfer mechanism which transfers a toner image formed on a photosensitive member onto a transfer receiving member, wherein the transfer mechanism includes a conductive member having resistance whose current-voltage characteristic changes by energization, and the image forming apparatus further includes a detector which detects a resistance value when currents or voltages of two or more levels are switched from one to another and applied to the conductive member, and a hardware processor which computes a slope of the current-voltage characteristic from the resistance value detected by the detector and determines a deterioration state of the conductive member by the slope.
    Type: Grant
    Filed: March 5, 2019
    Date of Patent: January 7, 2020
    Assignee: KONICA MINOLTA, INC.
    Inventor: Yu Harashima
  • Patent number: 10509359
    Abstract: An image forming apparatus includes a charging member, a light source, and a light quantity lowering member. The light quantity lowering member is provided so that a lowering amount of a quantity of a part of light reflected by a surface of a member at each of end portions of a charging region where the surface of the image bearing member is charged by the charging member is larger than that at a portion inside an associated end portion with respect to a rotational axis direction of the image bearing member.
    Type: Grant
    Filed: April 25, 2018
    Date of Patent: December 17, 2019
    Assignee: Canon Kabushiki Kaisha
    Inventors: Koichiro Masui, Nobuyoshi Yoshida
  • Patent number: 10488801
    Abstract: An image forming apparatus includes a controller configured to execute a mode for correcting a transfer voltage during a continuous image forming job of forming an image on a plurality of recording materials. The controller is configured to correct the transfer voltage on the basis of detection results which are detected by a voltage detection unit and a current detection unit during a predetermined time.
    Type: Grant
    Filed: July 11, 2018
    Date of Patent: November 26, 2019
    Assignee: Canon Kabushiki Kaisha
    Inventor: Yosuke Kagawa
  • Patent number: 10386748
    Abstract: A transfer device includes a holding body, a transfer body, and a setting portion. The holding body holds multiple layers including a base layer formed of a toner having a mass larger than a threshold. The toner is electrically charged by a charging device. The transfer body transfers the layers on the holding body to a recording medium. The setting portion sets the charging device so that the charging device electrically charges a toner immediately after being transferred to the holding body with a larger amount of electric charges when the base layer is located uppermost on the holding body, than when the base layer is located other than uppermost on the holding body.
    Type: Grant
    Filed: May 22, 2018
    Date of Patent: August 20, 2019
    Assignee: FUJI XEROX CO., LTD.
    Inventor: Koichiro Yuasa
  • Patent number: 10379476
    Abstract: An image forming apparatus includes a photoconductive drum, a transfer roller configured to transfer a visible image formed on the photoconductive drum to a sheet, and a processor. The processor is configured to acquire an interruption time, which is measured after a process including charging of the photoconductive drum is interrupted, and is equal to an amount of time elapsed while the photoconductive drum is in a charged state, determine a cleaning time depending on the interruption time, and execute a cleaning process on the transfer roller for the duration of the cleaning time.
    Type: Grant
    Filed: March 22, 2018
    Date of Patent: August 13, 2019
    Assignees: KABUSHIKI KAISHA TOSHIBA, TOSHIBA TEC KABUSHIKI KAISHA
    Inventor: Kazuhiro Nishiwaki
  • Patent number: 10303077
    Abstract: An image forming apparatus includes a photoconductor, an intermediate transfer belt, a metal transfer roller configured to transfer a toner image carried on the photoconductor to the intermediate transfer belt at a transfer position when a voltage is applied from a power supply, a detection portion configured to detect a current flowing when a voltage is applied to the transfer roller from the power supply, and a controller. The controller is capable of executing a mode in which a plurality of voltages higher than a discharge starting voltage is applied from the power supply to the transfer roller during a period other than a transfer period when the toner image carried on the photoconductor is transferred to the intermediate transfer belt. The controller is configured to output information regarding a lifetime of the intermediate transfer belt based on a current flowing when the plurality of voltages is applied to the transfer roller.
    Type: Grant
    Filed: March 5, 2018
    Date of Patent: May 28, 2019
    Assignee: Canon Kabushiki Kaisha
    Inventor: Tomohiro Saito
  • Patent number: 10281846
    Abstract: The image forming apparatus includes an image bearing member; an ionically conductive intermediate transferring belt; a primary transfer member; an opposing member that opposes the current supply member through the intermediate transferring belt, and a control unit configured to execute a recovery operation in a state where a primary transfer in which a toner image is primarily transferred to the image intermediate transferring belt from the image bearing member is not performed, wherein the recovery operation includes to supply a current flowing in a flow direction opposite to a flow direction of a current in the primary transfer through the opposing member from the current supply member to remove an uneven distribution of the conductive agent in the intermediate transferring belt caused by primary transfer.
    Type: Grant
    Filed: December 1, 2017
    Date of Patent: May 7, 2019
    Assignee: Canon Kabushiki Kaisha
    Inventors: Kenichi Iida, Takao Kume, Yusuke Shimizu, Keisuke Ishizumi, Toshihiko Takayama
  • Patent number: 10254684
    Abstract: An image forming device includes an image carrier carrying an image, a transfer device including paired transfer members that transport the image carrier and a recording medium, a grounded guide member that guides the recording medium to a transfer region, and a transfer power source that produces an electric field in the transfer region causing the image to be transferred onto the recording medium. The transfer power source includes a first transfer power source that imparts a first transfer voltage to one of the paired transfer members, and a second transfer power source that, when the recording medium has a predetermined resistance value or less, or is of low resistance having a conductive layer along a medium substrate face, imparts a second transfer voltage of opposite polarity and having an absolute value less than or equal to the first transfer voltage to the other of the paired transfer members.
    Type: Grant
    Filed: March 9, 2018
    Date of Patent: April 9, 2019
    Assignee: FUJI XEROX CO., LTD.
    Inventors: Kanji Watanabe, Daisuke Tanaka
  • Patent number: 10216122
    Abstract: The image forming apparatus includes a charge power source and a controller. The charge power source is configured to switch a voltage with the same polarity as an original charging polarity of a toner and a voltage with a polarity opposite to the original charging polarity of the toner and apply the voltages to a charge device. The controller executes a control of switching a polarity of a voltage to be applied from the charge power source to the charge device from the opposite polarity to the same polarity before termination of secondary transfer of all of toner images in a job, and moving both a residual toner charged to the opposite polarity through application of the voltage with the opposite polarity and a residual toner charged to the same polarity through application of the voltage with the same polarity to an image bearing member.
    Type: Grant
    Filed: May 24, 2017
    Date of Patent: February 26, 2019
    Assignee: Canon Kabushiki Kaisha
    Inventors: Tomoaki Nakai, Takamitsu Soda, Masaki Shimomura, Yusaku Iwasawa
  • Patent number: 10197953
    Abstract: An image forming apparatus includes an image bearing member; a transfer member configured to form a transfer portion where the toner image is transferred from the image bearing member by being supplied with a transfer bias; a carrier liquid supplying portion configured to supply the carrier liquid to the transfer portion; a transfer bias voltage source capable of applying the transfer bias to the transfer portion; a detecting portion configured to detect at least one of a voltage and a current at the transfer portion; and a setting portion configured to set the transfer bias during non-image-formation on the basis of a detection result of the detecting portion when a setting bias is applied from the transfer member in a state in which the carrier liquid is in the transfer portion.
    Type: Grant
    Filed: June 1, 2017
    Date of Patent: February 5, 2019
    Assignee: Canon Kabushiki Kaisha
    Inventor: Shohei Okumura
  • Patent number: 10191415
    Abstract: An image forming apparatus includes a developing device, an image bearer, a transfer rotator, a blade contacting a surface of the transfer rotator, and a controller to control the developing device, the image bearer, and the transfer rotator. A first toner pattern image is formed on the image bearer, transferred onto the transfer rotator, and passed past the blade at least twice together with rotation of the transfer rotator in at start-up of the image forming apparatus. A second toner pattern image is formed on the image bearer after the start-up and during passage of a non-image area in which toner images are not formed. A range of the first toner pattern image is wider than a range of the second toner pattern image in a width direction perpendicular to a direction of travel of the image bearer.
    Type: Grant
    Filed: November 2, 2017
    Date of Patent: January 29, 2019
    Assignee: Ricoh Company, Ltd.
    Inventors: Takehide Mizutani, Naoto Kochi, Katsuhito Haruno, Atsushi Nakamoto, Masakazu Imai, Osamu Ichihashi
  • Patent number: 10180643
    Abstract: A voltage maintenance element is connected to a contact member that contacts a primary transfer surface area of an intermediate transfer belt to which toner images are transferred from a plurality of image carriers between stretch members, in such a way as to prevent the electric potential of the intermediate transfer belt from varying between respective image forming stations.
    Type: Grant
    Filed: October 16, 2017
    Date of Patent: January 15, 2019
    Assignee: Canon Kabushiki Kaisha
    Inventors: Shinji Katagiri, Yuji Kawaguchi, Masaru Ohno, Tsuguhiro Yoshida, Takeo Kawanami, Taro Minobe, Masaru Shimura
  • Patent number: 10156795
    Abstract: A substrate processing apparatus includes: a rotary cylindrical member (DR) that includes a cylindrical supporting surface curved with a constant radius from a predetermined center line (AX2) and that feeds a substrate (P) in a length direction of the substrate; a processing mechanism that performs a predetermined process on the substrate at a specific position (PA, EL2) of a part of the substrate; a scale member (SD) that rotates about the center line along with the rotary cylindrical member so as to measure a displacement in a circumferential direction of the supporting surface of the rotary cylindrical member or a displacement in a direction of the center line of the rotary cylindrical member and that includes a scale portion (GP) carved in a ring shape; and a reading mechanism (EN1, EN2) that faces the scale portion, that is disposed in substantially a same direction as the specific position when viewed from the center line, and that reads the scale portion.
    Type: Grant
    Filed: May 21, 2018
    Date of Patent: December 18, 2018
    Assignee: NIKON CORPORATION
    Inventors: Masaki Kato, Tohru Kiuchi
  • Patent number: 10139778
    Abstract: A method of controlling transfer power of an image forming apparatus includes: determining a sensing feedback voltage by applying a set sensing current and measuring a first output voltage during a time period before an image is transferred to a transfer medium; measuring humidity and comparing the measured humidity with a set value; setting a target voltage based on the determined sensing feedback voltage when the measured humidity is equal to or higher than the set value; and adjusting the transfer current to apply the target voltage during a time period in which the image is transferred to the transfer medium.
    Type: Grant
    Filed: February 24, 2017
    Date of Patent: November 27, 2018
    Assignee: S-PRINTING SOLUTION CO., LTD.
    Inventors: Sun-woo Lee, Jeong-ho Choe
  • Patent number: 10120315
    Abstract: A characteristic measuring portion measures current-voltage characteristics of a primary transfer member before a toner image for a first surface of a sheet is primarily transferred. A characteristic information storage portion stores characteristic information that indicates the current-voltage characteristics. A first transfer voltage determining portion determines a first transfer voltage based on a first target current value and the characteristic information. A second transfer voltage determining portion determines a second transfer voltage based on a second target current value and the characteristic information that was used when the first transfer voltage was determined, the second target current value being smaller than the first target current value. A voltage control portion applies the first and second transfer voltages to the primary transfer member by a constant-voltage method when the toner images for the first and second surfaces of the sheet are primarily transferred, respectively.
    Type: Grant
    Filed: April 26, 2017
    Date of Patent: November 6, 2018
    Assignee: KYOCERA Document Solutions Inc.
    Inventor: Yuta Kitabayashi
  • Patent number: 10042293
    Abstract: An image forming apparatus includes a transfer power supply and a controller. The controller is configured to execute control for an end-portion voltage that is a DC voltage of a transfer bias at a time of transferring a toner image to an end portion of a recording sheet and a body-portion voltage that is a DC voltage of a transfer bias at a time of transferring a toner image to a body portion on a rear side of an end portion of a recording sheet, such that the end-portion voltage is set to be higher than the body-portion voltage in the DC transfer bias and a value obtained by dividing the end-portion voltage by the body-portion voltage in the superimposed transfer bias is set to be smaller than a value obtained by dividing the end-portion voltage by the body-portion voltage in the DC transfer bias.
    Type: Grant
    Filed: December 19, 2016
    Date of Patent: August 7, 2018
    Assignee: Ricoh Company, Ltd.
    Inventors: Naoto Kochi, Shinya Tanaka, Takehide Mizutani
  • Patent number: 10042292
    Abstract: An image forming apparatus includes a transfer unit and a pair of measuring units. The transfer unit transfers an image onto at least one recording medium by applying a voltage between the at least one recording medium and the image along a thickness direction of the at least one recording medium. Before the transfer unit applies the voltage, the pair of measuring units measure respective electrical resistance values of a front surface and a rear surface of the at least one recording medium in a direction crossing the thickness direction.
    Type: Grant
    Filed: November 9, 2016
    Date of Patent: August 7, 2018
    Assignee: FUJI XEROX CO., LTD.
    Inventors: Takashi Ochi, Hisashi Murase, Yuki Yokoyama, Takashi Ohashi, Keitaro Mori, Masahiko Fujita
  • Patent number: 10007190
    Abstract: A substrate processing apparatus includes: a rotary cylindrical member (DR) that includes a cylindrical supporting surface curved with a constant radius from a predetermined center line (AX2) and that feeds a substrate (P) in a length direction of the substrate; a processing mechanism that performs a predetermined process on the substrate at a specific position (PA, EL2) of a part of the substrate; a scale member (SD) that rotates about the center line along with the rotary cylindrical member so as to measure a displacement in a circumferential direction of the supporting surface of the rotary cylindrical member or a displacement in a direction of the center line of the rotary cylindrical member and that includes a scale portion (GP) carved in a ring shape; and a reading mechanism (EN1, EN2) that faces the scale portion, that is disposed in substantially a same direction as the specific position when viewed from the center line, and that reads the scale portion.
    Type: Grant
    Filed: February 21, 2017
    Date of Patent: June 26, 2018
    Assignee: NIKON CORPORATION
    Inventors: Masaki Kato, Tohru Kiuchi
  • Patent number: 9977377
    Abstract: An embodiment provides an image forming apparatus that has a first operation mode and a second operation mode. The first operation mode forms an image on a sheet with toner. The second operation mode decolorizes the toner on the sheet on which the image is formed with a decolorable toner having a decoloring function. In the first operation mode, when the sheet passes through a transfer unit, a transfer bias having the same polarity as that of a charge of the toner is applied to the transfer member and a toner image formed on a surface of the transfer member is transferred to the sheet. In the second operation mode, when the sheet passes through the transfer unit, a cleaning bias having a reverse polarity to that of the transfer bias is applied to the transfer member.
    Type: Grant
    Filed: March 22, 2017
    Date of Patent: May 22, 2018
    Assignees: KABUSHIKI KAISHA TOSHIBA, TOSHIBA TEC KABUSHIKI KAISHA
    Inventor: Koji Takahashi
  • Patent number: 9977362
    Abstract: An image forming apparatus includes a photosensitive drum, a primary transfer roller, first and second voltage applicators, first and second voltage controllers, a current detector, and a charging roller. The first voltage controller controls a voltage applied to the primary transfer roller through the first voltage applicator. The current detector detects a current value of a current flowing through the primary transfer roller. The second voltage controller controls a voltage applied to the charging roller through the second voltage applicator. The second voltage controller causes a voltage having a smaller absolute value than a dark potential of the photosensitive drum to be applied to the photosensitive drum during a transfer voltage control period. During the transfer voltage control period, the first voltage controller causes a voltage to be applied to the primary transfer roller, and the current detector detects the current value.
    Type: Grant
    Filed: January 12, 2017
    Date of Patent: May 22, 2018
    Assignee: KYOCERA Document Solutions Inc.
    Inventor: Tetsuya Toichi
  • Patent number: 9977376
    Abstract: A method for controlling transfer of black color toned images during simplex printing.
    Type: Grant
    Filed: December 30, 2016
    Date of Patent: May 22, 2018
    Assignee: Lexmark International, Inc.
    Inventor: William Paul Cook
  • Patent number: 9921528
    Abstract: An image forming apparatus including an image forming unit, a fixing unit, a temperature sensor, and a controller to execute a printing operation is provided. The printing operation is conducted at one of a first high-temperature printing pace, a first low-temperature printing pace, a second high-temperature printing pace, and a second low-temperature printing pace depending on a temperature detected by the temperature sensor. The first low-temperature printing pace is one of lower and equal to the first high-temperature printing pace. The second low-temperature printing pace is one of lower and equal to the second high-temperature printing pace. An absolute difference between the second high-temperature printing pace and the second low-temperature printing pace is greater than an absolute difference between the first high-temperature printing pace and the first low-temperature printing pace.
    Type: Grant
    Filed: May 29, 2015
    Date of Patent: March 20, 2018
    Assignee: BROTHER KOGYO KABUSHIKI KAISHA
    Inventors: Kotaro Haruta, Takuji Matsuno
  • Patent number: 9915902
    Abstract: An image forming apparatus includes an image carrier, a cleaning member that cleans the image carrier, an image forming unit that forms an image on a recording material, and a controller that controls the image forming unit based on at least one of physical property information and dimension information of the cleaning member.
    Type: Grant
    Filed: August 17, 2016
    Date of Patent: March 13, 2018
    Assignee: FUJI XEROX CO., LTD.
    Inventors: Hirofumi Hamada, Shinya Makiura, Eiji Nittono
  • Patent number: 9885972
    Abstract: An image forming includes an apparatus main body, a photoreceptor drum, a charging apparatus, a developing device, a transfer apparatus, a charging bias applying unit, a developing bias applying unit, a bias adjusting unit, and a print density measurement unit. The bias adjusting unit forms a non-charged area on a circumference surface of the photoreceptor drum and applies a developing bias constituted of a first electric potential to a developing roller to form a first toner image by an electric potential difference between the non-charged area and the developing roller. The charging bias applying unit forms a second toner image by an electric potential difference between the electric potential area and the developing roller. The charging bias applying unit decides a value of a charging bias corresponding to a target electric potential from measurement results of print densities of the first toner image and the second toner image.
    Type: Grant
    Filed: September 27, 2016
    Date of Patent: February 6, 2018
    Assignee: KYOCERA Document Solutions Inc.
    Inventors: Minoru Wada, Masaru Hatano, Masaki Kadota, Masahito Ishino, Keisuke Isoda, Atsushi Ishizaki
  • Patent number: 9846396
    Abstract: An image forming apparatus includes a plurality of image forming units, a plurality of image bearers, a transfer device, and a controller. The image forming units form a process color toner image and a special color toner image. The transfer device transfers the process color toner image and the special color toner image from the image bearers onto the intermediate transfer member. The controller is configured to correct a transfer bias applied to transfer the special color toner image onto the intermediate transfer member. The controller is configured to decrease the bias in a special color mode in which image formation is performed with only a special color and increase the bias in a full color mode in which image formation is performed with the special color and a process color, according to a degree of degradation of a developer used to form the special color toner image.
    Type: Grant
    Filed: October 6, 2016
    Date of Patent: December 19, 2017
    Assignee: RICOH COMPANY, LTD.
    Inventor: Atsushi Nagata
  • Patent number: 9841707
    Abstract: An image forming apparatus includes: an image carrier configured to carry a toner image; a transfer member configured to transfer the toner image onto a transfer target member by applying a transfer voltage of the opposite polarity of the polarity of the toner image to the transfer target member, the transfer member being in contact with the image carrier; an accepting unit configured to accept a setting for changing a preset current range to a new current range, the preset current range being defined by one of a lower limit of a current flowing in the transfer target member and an upper limit of the current; a sensing unit configured to sense a magnitude of the current flowing in the transfer target member; and a control device configured to control the transfer voltage so that the magnitude of the sensed current falls within the new current range.
    Type: Grant
    Filed: December 13, 2016
    Date of Patent: December 12, 2017
    Assignee: KONICA MINOLTA, INC.
    Inventors: Takahiro Kuroda, Kanji Nakayama, Kohei Hayashi, Tatsutoshi Yamada
  • Patent number: 9835989
    Abstract: An image forming apparatus 1 includes four developing devices 43, four primary transfer rollers 51, an intermediate transfer belt 54, voltage applicators 61, a current detector 62 and a voltage controller 911. The voltage applicators 61 each apply a voltage to a corresponding one of the four primary transfer rollers 51. The current detector 62 detects a first total current value JS of currents flowing through the four primary transfer rollers 51. The voltage applicators 61 apply a detection voltage VS to a primary transfer roller 51y among the four primary transfer rollers 51 while applying a voltage having the same polarity as the detection voltage VS to all the other primary transfer rollers 51c, 51m, and 51k. The detection voltage VS is applied to detect a resistance value Ry of the primary transfer roller 51y. The detection voltage VS has a predetermined voltage value.
    Type: Grant
    Filed: January 17, 2017
    Date of Patent: December 5, 2017
    Assignee: KYOCERA Document Solutions Inc.
    Inventor: Yuta Kitabayashi
  • Patent number: 9811042
    Abstract: An image forming device includes an image forming unit, a conveying unit, a first image detecting unit, a second image detecting unit, and a controller, wherein the controller includes a detecting unit correcting mode in which the first image detecting unit is corrected by using an image detection result by the second image detecting unit, and in the detecting unit correcting mode, a transfer paper conveying speed at the time of image reading by the second image detecting unit is changed to the transfer paper conveying speed different from a normal transfer paper conveying speed at the time of image formation and the first image detecting unit is corrected based on read results of the same image by the first and second image detecting units.
    Type: Grant
    Filed: July 30, 2015
    Date of Patent: November 7, 2017
    Assignee: KONICA MINOLTA, INC.
    Inventors: Mitsunori Nakamura, Kazuomi Sakatani
  • Patent number: 9804536
    Abstract: An image forming apparatus includes an endless belt that is stretched around plural rollers; a driving unit that drives the belt to rotate; a contact member that is in contact with a part of a surface of the belt, the part being supported by one of the plural rollers; and a switching device that changes an image forming mode by displacing at least one of the plural rollers. When the image forming mode is changed by the switching device, the belt is rotated by the driving unit in a normal direction at a speed higher than a speed of reverse rotation of the roller that is in contact with the contact member with the belt interposed therebetween.
    Type: Grant
    Filed: April 27, 2016
    Date of Patent: October 31, 2017
    Assignee: FUJI XEROX CO., LTD.
    Inventor: Kaoru Matsushita
  • Patent number: 9785099
    Abstract: An image forming apparatus includes a first forming unit that forms a first image with a substantially flat toner containing a substantially flat metal pigment on a moving movable body; a second forming unit that forms a second image with a substantially non-flat toner on the movable body; a transfer unit that forms a nip with the movable body while circulating and transfers the first image and the second image on a medium transported to the nip; a removing unit that includes a rotational body and removes the toners adhering to the transfer unit, the rotational body having an axis and being configured to rotate around the axis; and a controller that, if the controller causes the first forming unit to form the first image, stops the rotation of the rotational body around the axis.
    Type: Grant
    Filed: September 3, 2015
    Date of Patent: October 10, 2017
    Assignee: FUJI XEROX CO., LTD.
    Inventors: Masaaki Takahashi, Yoshiyuki Tominaga
  • Patent number: 9778603
    Abstract: A transfer device includes an image bearer and a transfer rotator. The transfer device further includes an adjuster including a rotatable cam and an opposed member opposed to the cam. The cam alternately contacts and separates the transfer rotator against and from the image bearer, having a continuous sloped surface with a plurality of positions, each position to contact the opposed member to obtain a different amount of separation between the image bearer and the transfer rotator. The transfer device further includes a controller to control the adjuster to adjust the amount of separation between the transfer rotator and the image bearer according to thickness or type of the recording medium when the recording medium starts to enter the transfer nip.
    Type: Grant
    Filed: June 23, 2016
    Date of Patent: October 3, 2017
    Assignee: Ricoh Company, Ltd.
    Inventors: Tsutomu Kato, Masakazu Imai, Osamu Ichihashi, Katsuhito Haruno, Takahiro Konishi
  • Patent number: 9760039
    Abstract: An image forming apparatus and an image forming method through which an effect of granting flavor to a printing object is excellent. In accordance with an embodiment, an image forming apparatus comprises a developing device and a fixing device. A toner is housed in the developing device. The fixing device includes a fixing roller and a pressure roller. The toner contains binder resin and a microcapsule in which perfume is encapsulated. A glass transition temperature of the toner is below 60 degrees centigrade. A nip part is formed by the fixing roller and the pressure roller. A pressure applied to an image receiving medium passing through the nip part is below 0.19 N/mm2.
    Type: Grant
    Filed: July 12, 2016
    Date of Patent: September 12, 2017
    Assignees: KABUSHIKI KAISHA TOSHIBA, TOSHIBA TEC KABUSHIKI KAISHA
    Inventors: Taishi Takano, Maiko Yoshida, Satoshi Araki, Takashi Urabe
  • Patent number: 9658579
    Abstract: An image forming apparatus includes an image bearer to bear a toner image, a toner image forming device to form the toner image on the image bearer, a nip forming device to contact the image bearer to form a transfer nip between the image bearer and the nip forming device, a transfer bias output device to output a transfer bias including a DC component and an AC component to transfer the toner image from the image bearer onto a recording medium interposed in the transfer nip, and a controller operatively connected to the transfer bias output device to adjust a frequency f of the AC component of the transfer bias in accordance with an image area ratio A such that the frequency f is at its minimum with a predetermined image area ratio Amin %, where Amin % is greater than 0 but lower than an image area ratio of a solid image.
    Type: Grant
    Filed: May 12, 2015
    Date of Patent: May 23, 2017
    Assignee: RICOH COMPANY, LTD.
    Inventors: Keigo Nakamura, Haruo Iimura, Shinji Aoki
  • Patent number: 9658578
    Abstract: A transfer device includes a belt image bearer; a driving roller that rotates the belt image bearer; a transfer member; first and second driving motors that respectively rotate the driving roller and the transfer member; first and second speed detecting units that respectively detect rotational speeds of the belt image bearer and the transfer member; and a control unit that implements control such that the belt image bearer and the transfer member are rotated at rotational speeds corresponding to a relative speed at which a variation amount is less than a predetermined variation amount, the variation amount being the variation of values of driving torques of the first and second driving motors in a state where the belt image bearer and the transfer member are in contact, with respect to these values in a state where the belt image bearer and the transfer member are separated.
    Type: Grant
    Filed: January 20, 2016
    Date of Patent: May 23, 2017
    Assignee: Ricoh Company, Ltd.
    Inventors: Hiromichi Matsuda, Kimiharu Yamazaki, Takafumi Seki, Jun Yamane