Patents Examined by Arlene Heredia
  • Patent number: 10599063
    Abstract: In a state where a developer borne by a developer bearing member is sandwiched by an opposing portion of an image bearing member and the developer bearing member, C denotes capacitance between the image bearing member and the developer bearing member, ?V denotes a development contrast, Q/S denotes a charge amount per unit area of the developer borne by the developer bearing member, and Av denotes a peripheral velocity ratio, which is a ratio of a peripheral velocity of the developer bearing member to a peripheral velocity of the image bearing member. A first peripheral velocity ratio is set so that |Q/S×?v|?|C×?V| is satisfied, and a second peripheral velocity ratio which is larger than the first peripheral velocity ratio is set so that |Q/S×?v|>|C×?V| is satisfied.
    Type: Grant
    Filed: March 17, 2017
    Date of Patent: March 24, 2020
    Assignee: CANON KABUSHIKI KAISHA
    Inventors: Norihito Naito, Go Shindo, Masataka Mochizuki
  • Patent number: 10591846
    Abstract: A replaceable unit for an electrophotographic image forming device according to one example embodiment includes a housing having a reservoir for storing toner. A rotatable shaft is positioned within the reservoir and has an axis of rotation. A first magnet and a second magnet are connected to the shaft and rotatable around the axis of rotation in response to rotation of the shaft. The first magnet and the second magnet are detectable by a magnetic sensor when the replaceable unit is installed in the image forming device. A polarity of the first magnet is oriented opposite a polarity of the second magnet relative to the shaft. An amount of angular offset between the first magnet and the second magnet varies depending on an amount of toner in the reservoir.
    Type: Grant
    Filed: April 27, 2018
    Date of Patent: March 17, 2020
    Assignee: Lexmark International, Inc.
    Inventors: Brian Scott Carpenter, Michael Craig Leemhuis, Robert Watson McAlpine
  • Patent number: 10579014
    Abstract: An image forming apparatus includes a dew condensation removal unit configured to execute dew condensation removal processing if it is determined that dew condensation may have occurred in the image forming apparatus, a reception unit configured to receive a print job for instructing execution of print processing, a restriction unit configured to restrict the execution of the print processing during execution of the dew condensation removal processing, a display control unit configured to control a display unit to display a selection screen for selecting whether to execute or cancel the print processing based on the print job if the print job is received during the execution of the dew condensation removal processing, and a print control unit configured to control the print processing to be executed after completion of the dew condensation removal processing if the execution of the print processing is selected.
    Type: Grant
    Filed: October 22, 2018
    Date of Patent: March 3, 2020
    Assignee: Canon Kabushiki Kaisha
    Inventor: Kiichi Hasegawa
  • Patent number: 10571860
    Abstract: Consumption of toner can be minimized in a method of performing dew condensation elimination through toner application to a photosensitive drum. To this end, an image forming apparatus includes a plurality of photosensitive drums; an intermediate transfer belt to which toner images are transferred from the plurality of photosensitive drums; a controller configured to determine whether or not a dew condensation occurrence condition is met; and a dew condensation elimination unit configured to perform a dew condensation elimination operation by applying toner to at least one of the plurality of photosensitive drums in a case in which the controller determines that the dew condensation occurrence condition is met and when a start instruction for image formation is received. When the image formation is started in a color image formation mode, the dew condensation elimination unit executes a first dew condensation elimination mode of applying toner to all of the plurality of photosensitive drums.
    Type: Grant
    Filed: December 4, 2018
    Date of Patent: February 25, 2020
    Assignee: Canon Kabushiki Kaisha
    Inventors: Naoto Watanabe, Hiroyuki Eda, Hidenori Matsumoto
  • Patent number: 10564595
    Abstract: A cartridge unit includes a first drum cartridge, a first cover member, a stopper, and a first cover erroneous insertion blocking portion. The first cover member is removably attached with the first drum cartridge and configured to be compatible in shape with a first holding portion of a first apparatus body so that the first cover member is guided and held by the first holding portion. The first cover erroneous insertion blocking portion is configured to permit the first cover member to be guided by the first holding portion by a first distance from a first insertion slot portion and to block a second cover member, which is removably attached with a second drum cartridge functionally different from the first drum cartridge, to be guided by the first holding portion in a range exceeding a second distance shorter than the first distance from the first insertion slot portion.
    Type: Grant
    Filed: May 25, 2018
    Date of Patent: February 18, 2020
    Assignee: Canon Kabushiki Kaisha
    Inventors: Shimpei Hanayama, Ryota Yasui, Hiroki Takayama
  • Patent number: 10558153
    Abstract: A fixing device includes a cylindrical film including a heat generating layer, a first temperature detecting member contacting the film, and a second temperature detecting member contacting the film and provided at such a position that a temperature change at the position, at which the second temperature detecting member is provided, is slower in responsiveness than at a position at which the first temperature detecting member is provided. A controller stops supply of electrical power to the film depending on a difference between a detection temperature value output by the first temperature detecting member, and a detection temperature value output by the second temperature detecting member. In addition, a toner image, formed on a recording material, is heated by heat from the film and is fixed on the recording material.
    Type: Grant
    Filed: September 8, 2017
    Date of Patent: February 11, 2020
    Assignee: Canon Kabushiki Kaisha
    Inventors: Kohei Wakatsu, Takashi Narahara, Takeshi Shinji, Toru Imaizumi, Kazuhiro Doda
  • Patent number: 10551770
    Abstract: A transfer device includes an intermediate transfer belt having a surface that receives a toner image, a support roller supporting the intermediate transfer belt, and a transfer unit that transfers the toner image from the intermediate transfer belt to a recording medium. The transfer unit includes a transfer belt and a transfer roller disposed opposite the support roller with the transfer belt and the intermediate transfer belt therebetween. The transfer roller has a volume resistance value of one-tenth or less of a system resistance value for a current of 120 ?A between the support roller and the transfer roller.
    Type: Grant
    Filed: March 11, 2019
    Date of Patent: February 4, 2020
    Assignee: FUJI XEROX CO., LTD.
    Inventors: Masayuki Seko, Masato Ono
  • Patent number: 10551769
    Abstract: A color printing unit includes one printing station for each color along with one anode roller. A continuous transfer belt is guided over a deflection roller and a control roller. One or more sensors measure a property of reference markings printed on the transfer belt. A control device for controlling and adjusting the transfer belt acts on the control roller through an actuating motor as a function of the detected properties of the reference markings. The one or more sensors are arranged in the area of the control roller for the transfer belt, by which an additional tension roller saves costs and space. During the measurement, at least for the period in which the printed reference markings pass under the one or more sensors, relative movements between the one or more sensors and the control roller are ruled out.
    Type: Grant
    Filed: August 25, 2017
    Date of Patent: February 4, 2020
    Assignee: ROTH + WEBER GmbH
    Inventors: Stephan Frisch, Frank Burda
  • Patent number: 10534281
    Abstract: An image forming apparatus has an image carrier, an electrifying member, and a charge eliminating device, and eliminates remaining charge on the surface of the image carrier by the charge eliminating device. The charge eliminating device includes a discharge member. The discharge member includes an electro conductive knit fabric knitted in a cylindrical shape using twisted yarn made of twisted metal fibers and a support member having a cylindrical shape and inserted in the electro conductive knit fabric, and is disposed to face the image carrier in a noncontact manner. A magnet member is disposed inside the image carrier within a charge elimination nip width between two tangential lines of an outer circumference surface of the discharge member, the two tangential lines being parallel to a straight line passing through a rotation center of the image carrier and a center axis of the discharge member.
    Type: Grant
    Filed: November 6, 2018
    Date of Patent: January 14, 2020
    Assignee: KYOCERA Document Solutions, Inc.
    Inventors: Tamotsu Shimizu, Hiroka Itani, Kenichi Tamaki
  • Patent number: 10534291
    Abstract: An image forming system includes an image carrier to rotate, a developer carrier to rotate, a container to contain the developer carrier, and a developer retainer separated from the rotatable developer carrier by a first gap of closest proximity, separated from the rotatable image carrier by a second gap of closest proximity, and separated from the container by a third gap of closest proximity. The first gap is less than the second gap and the third gap.
    Type: Grant
    Filed: December 18, 2018
    Date of Patent: January 14, 2020
    Assignee: HEWLETT-PACKARD DEVELOPMENT COMPANY, L.P.
    Inventors: Naoya Iwata, Satoshi Muramatsu, Tadao Mori
  • Patent number: 10520888
    Abstract: An image forming apparatus, including a casing, a toner cartridge, and a process cartridge, is provided. The toner cartridge detachably attached to the casing stores toner therein. The process cartridge detachably attached to the casing includes a developing unit and a drum unit. The developing unit includes a developer roller and a toner conveyer tube. The toner conveyer tube has a first opening, through which the toner from the toner cartridge is acceptable into the toner conveyer tube while the toner cartridge and the process cartridge are attached to the casing. The drum unit includes a photosensitive drum supporting the toner conveyer tube by contacting a circumferential surface of the toner conveyer tube. The developing unit is pivotable with respect to the drum unit with the toner conveyer tube and the drum unit being slidable on each other.
    Type: Grant
    Filed: August 21, 2018
    Date of Patent: December 31, 2019
    Assignee: BROTHER KOGYO KABUSHIKI KAISHA
    Inventors: Shougo Sato, Atsushi Fukaya
  • Patent number: 10514646
    Abstract: An image forming apparatus includes a latent image bearer, a latent image writing device, a developing device, a conveyance unit to convey a recording medium, a transfer device, a length data acquisition unit to obtain a length of the recording medium in a conveyance direction of the recording medium, an image forming processor to form a test pattern, and a light quantity correction calculator that acquires image density data of the test pattern and calculates a light quantity correction value to correct a light quantity. The image forming processor sets a position of the test pattern on the recording medium in the conveyance direction of the recording medium and a length of the test pattern in the conveyance direction of the recording medium based on the length of the recording medium in the conveyance direction of the recording medium obtained by the length data acquisition unit.
    Type: Grant
    Filed: May 25, 2018
    Date of Patent: December 24, 2019
    Assignee: Ricoh Company, Ltd.
    Inventors: Susumu Narita, Yoshinobu Sakaue, Ryo Sato, Koichi Murota, Masashi Suzuki, Takuma Nishio, Hiroaki Nishina
  • Patent number: 10503101
    Abstract: An example apparatus includes a conveyor. The apparatus also includes a first developer unit. The first developer unit is to concentrate first printing liquid. The first developer unit also is to deliver the first printing liquid to the conveyor. The apparatus also includes a second developer unit. The second developer unit is to concentrate second printing liquid. The second developer also is to deliver the second printing liquid to the conveyor to form a thick layer of printing liquid comprising the first and second printing liquid.
    Type: Grant
    Filed: February 8, 2016
    Date of Patent: December 10, 2019
    Assignee: HP Indigo B.V.
    Inventors: Giries Kadis, Marc Klein, Mark Sandler, Peter Nedelin, Marko Richter
  • Patent number: 10503111
    Abstract: An apparatus includes an image forming unit configured to form an image with a developing material; a mounting unit having a container mounted therein, the container containing the developing material; a controller configured to determine a remaining amount of the developing material in the container and determine a replenishing error of the container; and a display unit configured to display, in a state where a first condition is satisfied, a screen to prompt a reattachment of the container detached from the mounting unit while the container is not in the mounting unit, and display, in a state where a second condition is satisfied, a screen to prompt an execution of an operation for solving the replenishing error while the container is not in the mounting unit.
    Type: Grant
    Filed: April 4, 2018
    Date of Patent: December 10, 2019
    Assignee: CANON KABUSHIKI KAISHA
    Inventors: Ryou Sakaguchi, Toshifumi Oikawa, Hiroyuki Eda
  • 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: 10481533
    Abstract: A fixing device includes a fixing member, a temperature measurement sensor, a movement mechanism, a movement time calculation section, a movement position calculation section, and a temperature control section. The movement mechanism moves the temperature measurement sensor to scan non-heated regions and a heated region along a width direction of the fixing member. The movement time calculation section obtains an arrival time on the basis of a temperature change measured by the temperature measurement sensor due to movement of the temperature measurement sensor. The movement position calculation section calculates the movement position on the basis of a ratio of a second movement time to a first movement time. The temperature control section performs temperature control on the fixing member on the basis of the movement position calculated by the movement position calculation section, and the temperature measured by the temperature measurement sensor.
    Type: Grant
    Filed: December 28, 2018
    Date of Patent: November 19, 2019
    Assignees: KABUSHIKI KAISHA TOSHIBA, TOSHIBA TEC KABUSHIKI KAISHA
    Inventor: Norio Kurosawa
  • Patent number: 10481548
    Abstract: In a waste toner collecting device, primary cleaning devices and a secondary cleaning device remove residual toner that has remained on photoconductor drums and an intermediate transfer belt, respectively. A conveyance path guides the residual toner in a downstream direction. A toner container stores, as waste toner, the residual toner discharged from a downstream end of the conveyance path. A toner amount sensor outputs a detection signal whose level changes in correspondence with an amount of the waste toner. A derivation portion derives an accumulated value of the residual toner based on image data each time an image formation is performed. A determination portion determines whether or not an abnormality has occurred in the waste toner collecting device based on the level of the detection signal and the accumulated value.
    Type: Grant
    Filed: October 17, 2018
    Date of Patent: November 19, 2019
    Assignee: KYOCERA Document Solutions Inc.
    Inventor: Koji Murata
  • Patent number: 10481547
    Abstract: A cleaning device scrapes off and removes toner that has adhered to a surface of a rotating photoreceptor, and includes: a cleaning member formed of an elastic body; a leaf spring member for pressing the cleaning member against the surface of the photoreceptor; and a support portion supporting the leaf spring member. The cleaning member is fixed to one end of the leaf spring member, and the other end of the leaf spring member is fixed to the support portion with a cushioning member formed of an elastic body interposed therebetween. The cushioning member is fixed to the other end of the leaf spring member by an adhesive.
    Type: Grant
    Filed: March 15, 2017
    Date of Patent: November 19, 2019
    Assignee: Konica Minolta, Inc.
    Inventors: Junji Murauchi, Noritoshi Hagimoto, Yoshiki Nakane, Takuya Okada
  • Patent number: 10466641
    Abstract: An image forming unit including a photosensitive member including a gear portion on a one end side of the photosensitive member in a rotational axis direction, a roller that comes in contact with the photosensitive member, a bearing member that rotatably supports the roller, and an elastic member that urges the bearing member. In the image forming unit, directions of moments about a rotational axis of the roller acting on the bearing member disposed on the one end side of the photosensitive member in the rotational axis direction are the same in a case in which the roller is rotated and in a case in which the roller is stopped.
    Type: Grant
    Filed: May 14, 2018
    Date of Patent: November 5, 2019
    Assignee: Canon Kabushiki Kaisha
    Inventors: Hiroaki Nosho, Toru Oguma, Takatoshi Hamada
  • Patent number: 10459378
    Abstract: An image forming apparatus includes: a driving roller that conveys a paper sheet; a detector that detects a desired point on the driving roller; and a hardware processor that: acquires a waveform signal indicating one of a change in an image forming position with respect to the paper sheet and a change in a sheet conveyance velocity; extracts a synchronous waveform signal from the waveform signal acquired by the hardware processor, the synchronous waveform signal being synchronized with one revolution of the driving roller, the one revolution being detected by the detector; and inputs a drive signal to a drive source of the driving roller, the drive signal being input to weaken an amplitude of the synchronous waveform signal extracted by the hardware processor.
    Type: Grant
    Filed: April 27, 2018
    Date of Patent: October 29, 2019
    Assignee: Konica Minolta, Inc.
    Inventors: Takashi Fujiwara, Jun Onishi, Masahito Takano