Control Of Developing Patents (Class 399/53)
  • Patent number: 10353314
    Abstract: An image forming apparatus includes a developing unit, a transferring unit, and a fixing unit. The developing unit performs an attachment process in which the developing unit attaches a luminescent toner to a latent image that is formed on a basis of image data. The transferring unit performs a transfer process in which the transferring unit transfers, onto a medium, the luminescent toner attached to the latent image. The fixing unit performs a fixing process in which the fixing unit fixes, to the medium, the luminescent toner transferred onto the medium. The attachment process performed by the developing unit and the transfer process performed by the transferring unit are each performed plural times for the medium, on the basis of the image data.
    Type: Grant
    Filed: June 19, 2017
    Date of Patent: July 16, 2019
    Assignee: OKI DATA CORPORATION
    Inventor: Yuji Takino
  • Patent number: 10317819
    Abstract: A developer supplying device includes a supply driving portion supplying a developer from a developer supplying container to a developer accommodating portion, where it is agitated by an agitating conveyance portion. An agitating driving portion drives the agitating conveyance portion, and a control portion controls the supply driving portion and the agitating driving portion such that, each time the agitating conveyance portion is driven by a first driving amount, the supply driving portion is driven by a second driving amount. The control portion sets a different value of the first driving amount in accordance with a supplying property in a case where the developer is supplied from the developer supplying container to the developer accommodating portion.
    Type: Grant
    Filed: July 7, 2017
    Date of Patent: June 11, 2019
    Assignee: CANON KABUSHIKI KAISHA
    Inventor: Yutaka Koga
  • Patent number: 10274880
    Abstract: An image forming apparatus includes a controller to control a driving unit that rotates a developing rotary member. Rotation speed of the developing rotary member is controlled to become a first rotation speed in an image forming period. Rotation speed of the developing rotary member is decelerated from the first rotation speed in a first period of a non-image forming period so that the rotation speed becomes a second rotation speed lower than the first rotation speed, and rotation speed is decelerated from the second rotation speed in a second period subsequent to the first period of the non-image forming period so that the rotation of the developing rotary member is stopped. A deceleration amount per unit time of the developing rotary member in the first period is smaller than a deceleration amount per unit time of the developing rotary member in the second period.
    Type: Grant
    Filed: October 11, 2017
    Date of Patent: April 30, 2019
    Assignee: CANON KABUSHIKI KAISHA
    Inventors: Koji Shigehiro, Ryohei Terada
  • Patent number: 10254678
    Abstract: In an image forming apparatus, the image bearing member has a surface and configured to rotate about an axis. The collection device is in contact with the surface, and configured to collect materials adhered to the surface. The developing roller is configured to provide a charged toner having a first polarity. The processor is configured to perform: executing a print job in a printing period; executing, in a non-printing period, a first process in which the image bearing member is rotated at least one rotation while a holding bias is applied to the collection device, the holding bias having a second polarity opposite to the first polarity; and executing, in a non-printing period after the first process, a second process in which the image bearing member is rotated while an ejection bias is applied to the collection device, the ejection bias having the first polarity.
    Type: Grant
    Filed: September 21, 2017
    Date of Patent: April 9, 2019
    Assignee: Brother Kogyo Kabushiki Kaisha
    Inventors: Yuichi Matsushita, Hiroshige Hiramatsu, Chieko Mimura, Kengo Yada, Hotaka Kakutani, Shota Iriyama
  • Patent number: 10168642
    Abstract: A developing device includes upper and lower developer containing portions to contain developer, arranged in a vertical direction, a first developer conveyor to convey developer in the upper developer containing portion to a first side in an axial direction of the first developer conveyor, a second developer conveyor to convey developer in the lower developer containing portion to a second side opposite the first side, a developer-lifting area in which the developer is lifted from the lower developer containing portion to the upper developer containing portion, a first lifting area gear to rotate the first developer conveyor, a second lifting area gear to rotate the second developer conveyor, and a lifting area input gear to input a driving force to the developing device. The lifting area input gear is coupled to the first lifting area gear and coupled via the first lifting area gear via to the second lifting area gear.
    Type: Grant
    Filed: September 28, 2017
    Date of Patent: January 1, 2019
    Assignee: Ricoh Company, Ltd.
    Inventors: Tatsuya Ohhira, Masayuki Yamane, Keiichi Yoshida, Atsushi Kurokawa, Toshiki Hayashi, Yuuki Tsuchiya
  • Patent number: 10168654
    Abstract: An image forming apparatus includes an image carrying member, a developing device, a cleaning unit and a processor. The developing device performs development with a developer containing a toner and a lubricant. The processor obtains information on a lubricant amount in the developing device; obtains, with respect to each section formed by dividing a surface of the image carrying member in a rotating shaft direction of the image carrying member, a partial coverage from electrostatic latent image writing information for a predetermined period about the section; sets, for the section having the partial coverage of a predetermined value or less, a developer supply amount for a patch to be formed outside an image forming region on the image carrying member, based on the above information; and causes the developing device to supply the set developer supply amount so that the patch is formed.
    Type: Grant
    Filed: November 1, 2016
    Date of Patent: January 1, 2019
    Assignee: KONICA MINOLTA, INC.
    Inventors: Yuya Sato, Atsuto Hirai
  • Patent number: 10126680
    Abstract: A Toner Saver Feature (TSF) that enables adjustments in toner throughputs thus enhancing a user's control on toner consumption and thereby increasing life of cartridges in printing devices is disclosed. The disclosed TSF is configured to change throughput for each of the plurality of colorants based on at least one Preset Colorant Saver Configuration (Preset) that contains a set of Throughput Rate Reduction (TRR) values for each colorant, and wherein the at least one preset colorant saver configuration is user configurable. TSF enables a user to change the set of TRR values for each of the plurality of colorants individually through a user interface, and save the changed values as one of the Presets. The reduction values get implemented in all modes of printing wherein factory set throughput rates for the current mode get further reduced based on the selected Preset.
    Type: Grant
    Filed: June 27, 2017
    Date of Patent: November 13, 2018
    Assignee: KYOCERA DOCUMENT SOLUTIONS INC.
    Inventors: Philip Ver Paloma Dabon, Neil-Paul Payoyo Bermundo, Kendrick Esperanza Wong, Jesus Reyes Beltran
  • Patent number: 9952536
    Abstract: An image forming apparatus includes an image forming portion having a first feeding member to feed developer in a first chamber, a second feeding member to feed the developer in a second chamber; and a control portion to execute a plurality of modes by suspending image forming. A first mode circulates the developer in a condition in which a ratio of a rotational speed of the developer bearing member to a rotational speed of the first and second feeding members is decreased as compared to that in forming the images; and a second mode increases the ratio of the rotational speed of the developer bearing member to the rotational speed of the first feeding member as compared to that in forming the images. The second mode is executed after the first mode and before resuming the image forming operation.
    Type: Grant
    Filed: May 22, 2015
    Date of Patent: April 24, 2018
    Assignee: CANON KABUSHIKI KAISHA
    Inventors: Kyosuke Takahashi, Atsushi Matsumoto
  • Patent number: 9946191
    Abstract: An image forming apparatus that continuously carries out image formation on a plurality of recording materials includes an image bearing member and a developing device configured to develop an electrostatic latent image on the image bearing member. A first feeding screw is provided in a developing chamber and includes a first screw portion, a second screw portion and a third screw portion. Each of the second and third screw portions are provided with a blade portion formed helically on an outer peripheral surface of a rotation shaft of the first feeding screw, and the first screw portion is not provided with the blade portion. Based on information on the relative humidity in the developing container and on the amount of toner consumed with the image formation on a plurality of recording materials, a controller controls a driving speed for rotationally driving the first feeding screw by a driving device.
    Type: Grant
    Filed: November 17, 2016
    Date of Patent: April 17, 2018
    Assignee: CANON KABUSHIKI KAISHA
    Inventors: Atsushi Matsumoto, Kyosuke Takahashi
  • Patent number: 9897942
    Abstract: An image forming apparatus is operable in a mode of forming an image using only a part of image forming stations. In the mode, a developing device contacts an image bearing member in the part of the image forming stations, and the developing device is spaced from the image bearing member in the rest of the image forming stations. The contact pressure between the image bearing member and a transferring device is made smaller in the rest than in the part. The image forming operation in the mode is executed while the image bearing members of the part and the rest are rotated. A controller is configured such that when the operation in the mode is continuously executed for a time period longer than a predetermined period, the contact pressure in the rest is made larger than the above-mentioned smaller contact pressure.
    Type: Grant
    Filed: March 11, 2016
    Date of Patent: February 20, 2018
    Assignee: Canon Kabushiki Kaisha
    Inventors: Shunsuke Mizukoshi, Takaaki Shinkawa, Jun Miura, Takahiro Ikeda, Yuji Kawaguchi
  • Patent number: 9864321
    Abstract: An image forming apparatus includes: an image bearing member to which lubricant is supplied; a developing section that forms a toner image by attaching toner to an electrostatic latent image formed on the image bearing member; and a control section that controls an amount of the lubricant in the developing section based on an area ratio of the toner image formed on the image bearing member and a development condition when the toner image is formed by the developing section.
    Type: Grant
    Filed: July 29, 2016
    Date of Patent: January 9, 2018
    Assignee: KONICA MINOLTA, INC.
    Inventor: Atsuto Hirai
  • Patent number: 9860402
    Abstract: A recording apparatus includes a controller configured to: decrease the number of recording pages which is stored in a storage in response to completion of recording on a recording medium on a page-by-page basis; increase the number of recording pages in response to an increase in an amount of image data in the storage; determine whether the number of recording pages is greater than or equal to a first number; control a drive source and a recording device to convey the recording medium at a first speed and perform recording when the number of recording pages is less than the first number; and control the drive source and the recording device to convey the recording medium at a second speed greater than the first speed and perform the recording when the number of recording pages is greater than or equal to the first number.
    Type: Grant
    Filed: March 30, 2016
    Date of Patent: January 2, 2018
    Assignee: Brother Kogyo Kabushiki Kaisha
    Inventors: Tomoyasu Yabuki, Motohiro Tsuboi, Yuji Mori
  • Patent number: 9709919
    Abstract: A developing device includes a casing containing a two-component developer including toner and carrier, a developer bearer to transfer the developer on the developer bearer to a developing area, a toner density sensor to output an output value based on toner density of the developer, a toner density detection module to detect the toner density based on the output value of the toner density sensor and output characteristics relating the toner density and the output value, an acquisition module to acquire the output characteristics based on the output value of the toner density sensor relating a new developer and a predetermined toner density of the new developer, a bulk density fluctuation estimating module to estimate bulk density fluctuation for bulk density of the new developer, and a correction module to correct the output value based on the estimated bulk density fluctuation.
    Type: Grant
    Filed: May 22, 2015
    Date of Patent: July 18, 2017
    Assignee: RICOH COMPANY, LTD.
    Inventors: Kazuya Saitoh, Hiroomi Tamura, Tetsuto Ueda, Sho Sekiguchi
  • Patent number: 9703245
    Abstract: An image forming apparatus that forms an image on a printing medium by an electrophotographic system in accordance with input image data, the apparatus including: a plurality of image forming units configured to form images in colors different from one another; a first determination unit configured to determine whether or not toner amount adjustment is necessary based on a possibility of the occurrence of a ghost for image data that is used for image formation in a second image forming unit located on the upstream side of a first image forming unit that is located on the downstream side in a conveyance direction of the printing medium of the plurality of image forming units; and a toner amount adjustment unit configured to make toner amount adjustment for the image data that is used for image formation in the second image forming unit in accordance with the determination results by the first determination unit.
    Type: Grant
    Filed: January 28, 2016
    Date of Patent: July 11, 2017
    Assignee: Canon Kabushiki Kaisha
    Inventor: Jun Nagai
  • Patent number: 9563170
    Abstract: An image forming apparatus includes image bearing members, a latent image forming portion, developing units each including a developing member, a movable member, a common driving source, a contact-and-separation unit, and a control unit. The image forming apparatus is capable of forming the images in an operation in an image forming mode. After end of the latent image formation on one of the image bearing members on which latent image formation is finally started and before end of transfer of an associated image from the one image bearing member, the control unit outputs a spacing signal for spacing associated developing members from the other image bearing members, during the image formation in the operation in the mode.
    Type: Grant
    Filed: February 9, 2016
    Date of Patent: February 7, 2017
    Assignee: CANON KABUSHIKI KAISHA
    Inventor: Takuya Kitamura
  • Patent number: 9541889
    Abstract: An image forming apparatus includes a developing unit and a supply amount increasing unit. The developing unit supplies oil-impregnated particles to an image carrier and develops an electrostatic latent image by a developer on the image carrier which is electrically charged to a polarity that is opposite a polarity of the developer which is electrically charged to a positive polarity or a negative polarity, based on a potential difference between a developing part and the image carrier. The supply amount increasing unit increases an amount of supply of the oil-impregnated particles to the image carrier by adjusting the potential of the image carrier, while a developing operation is not being performed by the developing unit.
    Type: Grant
    Filed: September 17, 2015
    Date of Patent: January 10, 2017
    Assignee: FUJI XEROX CO., LTD.
    Inventor: Yasutaka Matsumoto
  • Patent number: 9459575
    Abstract: An image forming apparatus including a control device configured to predict, before printing a print job, whether or not a temperature of developer carried on a developing roller during the printing of the print job, in which the developing roller is rotated at a predetermined rotational speed, becomes equal to or higher than a first predetermined value by using a temperature detected by a temperature detector, rotate the developing roller at the predetermined rotational speed in a case where the predicted temperature does not become equal to or higher than the first predetermined value, and rotate the developing roller at a low speed lower than the predetermined rotational speed from a start to an end of the printing of the print job in a case where the predicted temperature becomes equal to or higher than the first predetermined value.
    Type: Grant
    Filed: October 28, 2015
    Date of Patent: October 4, 2016
    Assignee: Brother Kogyo Kabushiki Kaisha
    Inventor: Yuichi Matsushita
  • Patent number: 9395647
    Abstract: An image forming apparatus includes: an image bearing member on which a toner image is formed; an image forming section configured to form the toner image by attaching toner mixed with lubricant to the image bearing member, and transfer the toner image formed on the image bearing member to a sheet; a computing section configured to compute a time average value of a coverage of the toner image transferred to the sheet by the image forming section for each of a plurality of different time periods; and a control section configured to control the image forming section to form a toner image of a pattern for forcible toner ejection on the image bearing member in accordance with a result of computing of the computing section.
    Type: Grant
    Filed: April 28, 2015
    Date of Patent: July 19, 2016
    Assignee: KONICA MINOLTA, INC.
    Inventor: Shinichi Tsukamura
  • Patent number: 9323179
    Abstract: A developing unit includes a casing, a developer carrier, a developer conveying path, a developer conveying member, and a layer thickness regulator. The developer carrier is driven to rotate in the casing and carries a toner on the circumferential surface. The developer conveying member is located in the developer conveying path and driven to rotate so as to convey the developer in a second direction and to supply the toner to the developer carrier. The layer thickness regulator is spaced from the developer carrier, and regulates a layer thickness of the developer supplied to the developer carrier. The developing unit is configured to satisfy a condition of 2.0<Vd/Vs<7.0, where Vd denotes a circumferential velocity of the developer carrier and Vs denotes a circumferential velocity of the developer conveying member.
    Type: Grant
    Filed: January 15, 2014
    Date of Patent: April 26, 2016
    Assignee: KYOCERA DOCUMENT SOLUTIONS INC.
    Inventors: Tamotsu Shimizu, Shizuka Okada, Takefumi Yotsutsuji, Akifumi Yamaguchi
  • Patent number: 9310765
    Abstract: An image forming apparatus includes an image forming device to form a toner image on a sheet; a fixing device to fix the toner image on the sheet; a toner container to house the toner to be supplied to the image forming device, the toner container arranged above the fixing device; a cooling fan; a guide to guide an airflow coming from the cooling fan to an outer circumferential surface of the toner container; an outer-circumferential flow path to serve as an airflow path between the outer circumferential surface of the toner container and a wall facing the outer circumferential surface, the outer-circumferential flow path guiding the airflow coming from the guide along the outer circumferential surface; a suction fan to suck the airflow having passed through the outer-circumferential flow path; and an exhaust guide to discharge the sucked airflow.
    Type: Grant
    Filed: February 26, 2015
    Date of Patent: April 12, 2016
    Assignee: RICOH COMPANY, LIMITED
    Inventor: Hirotaka Endo
  • Patent number: 9310718
    Abstract: In a development device, a developer carrier arranged in a housing containing a one-component developer has a circumferential surface carrying the developer. A developer conveying path includes one conveying path along the developer carrier in a first direction and another conveying path in a second direction opposite to the first direction. The developer is circulated and conveyed between the conveying paths. A developer conveying member is arranged in the one conveying path and rotationally driven to convey the developer along the first direction and to supply the developer to the developer carrier. A layer thickness adjusting member is arranged at a distance from the circumferential surface to adjust a layer thickness of the developer supplied to the developer carrier. The developer carrier has a circumferential speed Vd and the developer conveying member has a circumferential speed Vs so that a circumferential speed ratio Vd/Vs satisfies a relationship represented by 1.3?Vd/Vs?5.0.
    Type: Grant
    Filed: November 19, 2013
    Date of Patent: April 12, 2016
    Assignee: KYOCERA Document Solutions Inc.
    Inventors: Tamotsu Shimizu, Shizuka Okada, Takefumi Yotsutsuji, Akifumi Yamaguchi
  • Patent number: 9291938
    Abstract: When a toner charging amount for toner in a liquid developer conveyed to a development portion is set, a wet-type image formation apparatus performs a sensing operation in which a sensing unit senses image densities of a plurality of patch images formed at different development biases with the toner charging amount being set to a constant value, and a setting operation in which, in a case where a control unit calculates current development characteristics based on the image densities of the plurality of patch images sensed by the sensing unit, and determines that the current development characteristics are not included within a set target range, the control unit controls a charging unit to set the toner charging amount such that the development characteristics are included within the set target range.
    Type: Grant
    Filed: September 11, 2014
    Date of Patent: March 22, 2016
    Assignee: KONICA MINOLTA, INC.
    Inventors: Takeshi Maeyama, Atsuto Hirai, Yuuya Sato, Makiko Watanabe
  • Patent number: 9244380
    Abstract: An image forming apparatus is capable of executing, in non-image formation, for example, in a sheet-to-sheet interval, a developer bearing member stop mode in which the developer conveyance by a development sleeve is stopped. For example, the apparatus turns off primary transfer bias in the sheet-to-sheet interval. Even if fogging toner is no longer supplied after the development sleeve drive is stopped, the apparatus can reduce frictional force variation between the photosensitive drum and the intermediate transfer belt to prevent speed variation of the photosensitive drum or the intermediate transfer belt, thus reducing the possibility of image unevenness and out of color registration.
    Type: Grant
    Filed: August 6, 2013
    Date of Patent: January 26, 2016
    Assignee: Canon Kabushiki Kaisha
    Inventors: Yoshiro Tsukada, Kengo Sato, Tadashi Iwakawa
  • Patent number: 9213260
    Abstract: Provided is an image forming apparatus, including a first image portion that uses a first toner, and a second image portion that uses a second toner having a particle diameter greater than a particle diameter of the first toner, wherein, in a case where a first image of the first image portion is formed on a recording medium and a second image of the second image portion is formed on the first image, as compared to a case where only the first image is formed on the recording medium, an amount of the first toner per unit area of the first image increases.
    Type: Grant
    Filed: October 23, 2014
    Date of Patent: December 15, 2015
    Assignee: FUJI XEROX CO., LTD
    Inventors: Satoshi Shigezaki, Sho Watanabe
  • Patent number: 9207563
    Abstract: To provide an image forming apparatus that includes a plurality of image forming units and executes a mode for image formation by using a selected image forming unit, the image forming apparatus being able to restrict a decrease in productivity and restrict an image defect such as a lack of part of an image output during the execution of the mode. In a monochrome mode for forming an image only with a black toner, in the first image forming unit, a toner is caused to adhere to a region on a photosensitive body corresponding to a sheet interval and hence the toner is supplied to a cleaning blade by applying a development bias to a developing unit without applying a direct-current voltage to a charger of a color image forming unit not used for the image formation. Also, an alternating-current voltage is applied to the charger when the region on the photosensitive body from which the toner is removed by the cleaning blade passes through the charger.
    Type: Grant
    Filed: July 11, 2013
    Date of Patent: December 8, 2015
    Assignee: Canon Kabushiki Kaisha
    Inventor: Ryota Fujioka
  • Patent number: 9176452
    Abstract: An image forming apparatus has an image carrier, a developing unit, a toner container, a pixel counter, and a used toner amount estimator. An electrostatic latent image is formed on the image carrier's surface. The developing unit feeds toner on the image carrier's surface. The toner container with a transport screw supplies toner to the developing unit. The pixel counter counts the number of pixels in toner images formed on the image carrier's surface since the toner container started being used. The used toner amount estimator estimates the amount of toner used, until the cumulative value of the number of revolutions of the transport screw reaches a predetermined number, based on the cumulative value and, thereafter, by multiplying the pixel count of the pixel counter by a coefficient. The estimator corrects the coefficient based on the pixel count as observed when the cumulative value reaches the predetermined number.
    Type: Grant
    Filed: March 18, 2015
    Date of Patent: November 3, 2015
    Assignee: KYOCERA Document Solutions Inc.
    Inventor: Shigeharu Ito
  • Patent number: 9164459
    Abstract: An image forming apparatus includes an image bearing member for bearing a image; a developing container for accommodating a developer comprising toner and carrier; a rotatable developer carrying member, provided in an opening of the developing container, for developing an electrostatic latent image formed on the image bearing member; a feeding device for feeding the developer in the developing container toward the developer carrying member; detecting device for detecting information relating to a consumption amount of the developer; and a controller for executing, when a image formation is continuously effected for a plurality of recording materials, a operation in a mode in which on the basis of a result of detection of the detecting device, the image forming operation is interrupted, and a operating condition of at least one of the feeding device and the developer carrying member is changed.
    Type: Grant
    Filed: September 16, 2011
    Date of Patent: October 20, 2015
    Assignee: CANON KABUSHIKI KAISHA
    Inventor: Hideaki Suzuki
  • Patent number: 9104142
    Abstract: The developing device includes a developing container that stores a developer including a non-magnetic toner and a magnetic carrier, a toner bearing member that bears the toner and conveys the toner to a developing portion and a separating portion wherein a surface of the toner bearing member includes a plurality of recess structures. A percentage of the recess structures per unit area in a toner bearing region of the toner bearing member is equal to or larger than 55%.
    Type: Grant
    Filed: December 5, 2013
    Date of Patent: August 11, 2015
    Assignee: CANON KABUSHIKI KAISHA
    Inventors: Kenta Kubo, Tatsuya Tada, Satoru Yamanaka, Hideaki Okamoto
  • Patent number: 9098017
    Abstract: An image forming apparatus has a developing device and a controller. The developing device includes a stirring member, rotatable at a first speed or at a second speed lower than the first speed, which varies, according to its speed, the amount of developer discharged out of the developing device. The controller drives the stirring member to rotate at the second speed, then switches the rotation speed of the stirring member to a third speed higher than the second speed but lower than the first speed, and then drives the stirring member to rotate at the third speed for a first period. The third speed is set higher the lower the fluidity of the developer.
    Type: Grant
    Filed: November 24, 2014
    Date of Patent: August 4, 2015
    Assignee: KYOCERA Document Solutions Inc.
    Inventor: Hiroyuki Hamakawa
  • Patent number: 9081325
    Abstract: Provided is an image forming device including an image holding member that is rotatable at a first speed and a second speed, a developing unit that includes a developing part that is rotatable at a third speed and a fourth speed, and a carrying part that is rotatable at a fifth speed and a sixth speed, and a control unit that executes a change of a high speed mode in which the image holding member is operated at the first speed, the developing part is operated at the third speed and the carrying part is operated at the fifth speed to perform development and a low speed mode in which the image holding member is operated at the second speed, the developing part is operated at the fourth speed and the carrying part is operated at the sixth speed to perform development.
    Type: Grant
    Filed: May 7, 2014
    Date of Patent: July 14, 2015
    Assignee: FUJI XEROX CO., LTD.
    Inventor: Tomio Onuki
  • Patent number: 9042753
    Abstract: An image forming apparatus includes an image forming portion; a supplying device for supplying a toner; a transfer device capable of transferring the toner image from the image forming portion onto a toner image receiving member; a first detecting portion for detecting a transfer current of the transfer device; a second detecting portion for detecting information on a toner amount of the transferred toner image; and a controller for controlling, during non-image formation, a supplying operation of the supplying device on the basis of a detection result of the first detecting portion when a toner image for measurement formed at the image forming portion is transferred by the transfer device at a transfer voltage lower than a discharge start voltage and on the basis of a detection result when the toner image for measurement transferred on the toner image receiving member is detected by the second detection portion.
    Type: Grant
    Filed: August 29, 2012
    Date of Patent: May 26, 2015
    Assignee: Canon Kabushiki Kaisha
    Inventor: Noriyuki Okada
  • Patent number: 9042756
    Abstract: In an image forming apparatus that is provided with a developing unit to develop an electrostatic latent image formed on an image carrier as a toner image, the developing unit is provided with a developer reservoir that is disposed between a supplying roller to feed developer agitated by an agitating member into the developer reservoir and a developing roller to cause the developer in the developer reservoir to adhere onto the latent image on the image carrier so as to be developed as the toner image. A control section controls driving of the supplying roller, independently from driving of the agitating member.
    Type: Grant
    Filed: November 22, 2013
    Date of Patent: May 26, 2015
    Assignee: KONICA MINOLTA, INC.
    Inventor: Takumi Sakurada
  • Publication number: 20150139669
    Abstract: An image forming apparatus includes: a cartridge installing section in which a first cartridge and a second cartridge are selectively installable; and a controller. The first cartridge includes: a first case configured to contain a first developer; a first developing roller; and a first transport member configured to transport the first developer toward the first developing roller. The second cartridge includes: a second case configured to contain a second developer, an amount of the second developer being greater than an amount of the first developer; a second developing roller; and a second transport member configured to transport the second developer toward the second developing roller. The controller is configured to control a drive source to drive one of the first transport member and the second transport member.
    Type: Application
    Filed: November 14, 2014
    Publication date: May 21, 2015
    Inventor: Hikaru Yoshizumi
  • Patent number: 9037018
    Abstract: A method of controlling toner concentration in an image forming device by determining a charge per unit mass of toner in a mixture of toner and carrier and adding toner to the mixture if the charge per unit mass of the toner is higher than a predetermined threshold. Other methods and devices are disclosed.
    Type: Grant
    Filed: February 13, 2014
    Date of Patent: May 19, 2015
    Assignee: Lexmark International, Inc.
    Inventors: Marc Cousoulis, Courtney Harrison Soale
  • Patent number: 9031434
    Abstract: An image forming apparatus includes an image bearing member, a developer carrying member, a first chamber for permitting feeding of the developer to the developer carrying member, and a second chamber for forming a circulation path of the developer at end portions thereof. The second chamber collects the developer from the developer carrying member at an opposing position, and a screw member feeds the developer contained in the first and second chambers. In addition, a supplying portion supplies a developer, a discharging portion, provided in the circulation path, causes an excessive developer to overflow, and a controller controls, on the basis of information on a first drive time from a start of rotation of the screw member to an end of a developing operation, a second drive time from the end of the developing operation to a stop of the rotation of the screw member.
    Type: Grant
    Filed: January 11, 2013
    Date of Patent: May 12, 2015
    Assignee: Canon Kabushiki Kaisha
    Inventor: Yoshiro Tsukada
  • Patent number: 9020378
    Abstract: Patch background data at each position of a background where a toner patch is formed in the second rotation is estimated from background measurement data at a plurality of positions detected in the first rotation and patch neighborhood measurement data detected in the second rotation at a plurality of positions where no toner patch is formed. Since the apparatus can execute density measurement before the light emission amount of a density sensor stabilizes, the time required for density measurement can be shorter than before. Since the change ratio of the light emission amount and the variation of the reflected light amount from the background are reflected on the patch background data, the density measurement accuracy can be improved.
    Type: Grant
    Filed: August 27, 2012
    Date of Patent: April 28, 2015
    Assignee: Canon Kabushiki Kaisha
    Inventor: Tadashi Fukumuro
  • Patent number: 9020381
    Abstract: Image forming apparatus is disclosed. The developing portion is replenished with toner from a toner containing body by operating a toner feeding mechanism. The receiving portion receives a designation of switching to a low speed i.e. switching the rotation speed of the motor from the first speed to the second speed lower than the first speed. The measuring portion measures a value of a counter electromotive voltage generated in the motor by causing the motor to operate the toner feeding mechanism. The motor control portion causes the motor to rotate at the first speed until an absolute value of the value measured by the measuring portion is not larger than a predetermined first value, and causes the motor to rotate at the second speed after an absolute value of the measured value is smaller than the first value, in the case where the switching to a low speed is designated.
    Type: Grant
    Filed: December 26, 2012
    Date of Patent: April 28, 2015
    Assignee: KYOCERA Document Solutions Inc.
    Inventor: Junichi Fukuoka
  • Publication number: 20150110509
    Abstract: A detection device configured to detect a charge amount of toner on a developer carrier, comprises: an assembly including a quartz oscillator and having a first surface and a second surface that are provided in the quartz oscillator, the first surface having a recess and a projection formed in a direction in which the quartz oscillator vibrates; a capacitor connected to the assembly; a first measurement unit configured to measure a potential difference between two ends of the capacitor; and a second measurement unit configured to measure a frequency of the quartz oscillator, wherein in a case where an alternating-current power is applied to the assembly, the direction in which the quartz oscillator vibrates is parallel to the first surface.
    Type: Application
    Filed: October 16, 2014
    Publication date: April 23, 2015
    Inventors: Mineto Yagyu, Shingo Horita, Masaaki Naoi, Megumi Uchino, Yoshihiro Shigemura
  • Patent number: 9002225
    Abstract: An image forming apparatus capable of forming an image includes an image bearing member on which an electrostatic latent image is to be formed, a developer carrying member for carrying a developer to visualize the electrostatic latent image, and a developer feeding member, having a foam layer at its surface, for feeding the developer to the developer carrying member by being rotated in contact with the developer carrying member. In addition, a controller is capable of executing an operation in a first mode in which the developer feeding member is rotated for a first time and then the electrostatic latent image is visualized at a first speed by the developer carrying member and an operation in a second mode in which the developer feeding member is rotated for a second time longer than the first time and then the electrostatic latent image is visualized at a second speed slower than the first speed by the developer carrying member.
    Type: Grant
    Filed: November 26, 2012
    Date of Patent: April 7, 2015
    Assignee: Canon Kabushiki Kaisha
    Inventors: Nobuo Oshima, Masahiro Yoshida, Koichiro Takashima, Kohei Matsuda, Kuniaki Tamagaki, Takashi Mukai, Jun Miura
  • Patent number: 8983320
    Abstract: An image forming apparatus includes a latent-image bearing body, a charging unit, a latent-image writing unit, a development unit, a development power, and a bias control unit. After a start of an image forming operation, the bias control unit performs a process of constantly maintaining an output of a development bias at an adjustment bias value. The adjustment bias value is a central value in a periodic fluctuation range of the output of the development bias. At a timing at which a difference of the development bias from the adjustment bias value in the periodic fluctuation range is less than or equal to a predetermined threshold value, the bias control unit performs switching from the process of constantly maintaining the output of the development bias at the adjustment bias value to a process of periodically changing the output of the development bias based on development bias control data.
    Type: Grant
    Filed: March 11, 2014
    Date of Patent: March 17, 2015
    Assignee: Ricoh Company, Ltd.
    Inventors: Shingo Suzuki, Satoshi Kaneko, Tetsuya Muto, Shuji Hirai, Shinichi Akatsu, Keita Gotoh, Yuuichiroh Uematsu
  • Patent number: 8983319
    Abstract: An image forming apparatus includes an image carrier that carries an electrostatic latent image; a developer supplying unit that supplies developer by being driven at a predetermined speed; a developing unit that develops the electrostatic latent image, while a transporting member transports the developer, a transport speed of the transporting member being switched to a plurality of speeds; a determining unit that determines whether or not an operation where a supply capacity of the developer supplying unit is greater than a transport capacity of the developing unit exceeds a predetermined threshold value and is continued; and a controller that performs control so that, when the determining unit determines that the operation exceeds the predetermined threshold value and is continued, an operation that was being executed immediately prior to the determination is stopped to forcefully drive the transporting member of the developing unit for a predetermined driving time.
    Type: Grant
    Filed: August 20, 2012
    Date of Patent: March 17, 2015
    Assignee: Fuji Xerox Co., Ltd.
    Inventors: Takashi Sakamoto, Hiroaki Okuma, Daisuke Nakai
  • Publication number: 20150071664
    Abstract: In the present wet-type image formation apparatus, when setting a standard image formation condition, a control unit adjusts both a conveyance amount of toner and a charge amount of the toner in order to obtain a predetermined developing characteristic. During normal image formation, the control unit obtains the image density of a patch image formed at a high contrast potential and the image density of a patch image formed at a low contrast potential, adjusts the conveyance amount of the toner when the image density of the patch image formed at the high contrast potential is varied from the developing characteristic for the standard image formation condition, and adjusts the charge amount of the toner when the image density of the patch image formed at the low contrast potential is varied from the developing characteristic for the standard image formation condition.
    Type: Application
    Filed: September 11, 2014
    Publication date: March 12, 2015
    Inventors: Atsuto Hirai, Takeshi Maeyama, Yuuya Sato, Makiko Watanabe
  • Patent number: 8977150
    Abstract: An image forming apparatus includes a rotatable photoconductor, a charging unit, an exposure unit to expose the photoconductor to reduce an electrical potential at the photoconductor, a developing unit to charge the toner held on a toner bearing member with friction and attract the toner to the exposed portion on the photoconductor by supplying a development voltage from a first power source and using an electrical potential difference between the toner bearing member and the photoconductor in the development area, a reverse development voltage controller to supply a reverse development voltage while a non-charged portion on the photoconductor passes the development area, and a developer reducing potential applier to supply a development restraining potential and an absolute value smaller than a target charging potential to the photoconductor while the reverse development voltage is supplied.
    Type: Grant
    Filed: November 15, 2012
    Date of Patent: March 10, 2015
    Assignee: Ricoh Company, Ltd.
    Inventors: Shin Yamamoto, Shin Murayama, Yoshio Sakagawa, Yuji Nagatomo
  • Patent number: 8971741
    Abstract: An image forming device includes each of developing devices including an image carrying part, a charging part that charges the image carrying part, a developing part on which a developing voltage is applied and which attaches developer to the image carrying part to develop the electrostatic latent image, and a control part that controls each of the developing devices. The developers are a white developer and other color developers, one of the developing devices using the white developer being defined the white developing device, the others using the other color developers being defined the non-white developing devices, and a developing potential difference of the white developing device is smaller than other developing potential differences of the non-white developing devices, the developing potential difference being defined between the developing voltage and potential of the image carrying part of the each developing device.
    Type: Grant
    Filed: July 24, 2013
    Date of Patent: March 3, 2015
    Assignee: Oki Data Corporation
    Inventor: Hidetaka Mitsunobu
  • Patent number: 8965227
    Abstract: An image forming apparatus includes a toner forced consumption control unit that performs toner forced consumption control in which toner in a developing unit is forcibly consumed when a certain condition to perform the toner forced consumption control is met. The certain condition to perform the toner forced consumption control includes a specific performance condition that a transfer bias switching condition to switch a transfer bias to a superimposed transfer bias in which an alternating current component is superimposed on a direct current component, from a direct current transfer bias is met. When the specific performance condition is met, the toner forced consumption control unit performs preliminary toner forced consumption control in which the toner forced consumption control is performed before an image forming operation using the superimposed transfer bias is started.
    Type: Grant
    Filed: March 5, 2013
    Date of Patent: February 24, 2015
    Assignee: Ricoh Company, Limited
    Inventors: Takehide Mizutani, Shinya Tanaka, Yasunobu Shimizu, Hirokazu Ishii, Keigo Nakamura
  • Publication number: 20150043932
    Abstract: The present application discloses a container including: a housing including a primary portion for storing developer, and a secondary portion, which projects from the primary portion and is connected to a developing device; a conveying mechanism which conveys the developer in the primary portion to the secondary portion; and a detector which detects a state of the developer. The primary portion includes a facing wall which is situated at a boundary between the primary and secondary portions so that the facing wall faces a flow of the developer moving toward the secondary portion. The developer includes a flowing portion under the conveyance to the secondary portion by the conveying mechanism, and an adhering portion defined by an adhering layer made of developer adhered to the facing wall. The detector detects a decrease of the flowing portion and a decrease of the adhering portion individually.
    Type: Application
    Filed: February 21, 2013
    Publication date: February 12, 2015
    Applicant: KYOCERA Document Solutions Inc.
    Inventor: Takahisa Nakaue
  • Patent number: 8948637
    Abstract: An image forming apparatus includes a first image forming part that forms a first developer image representing an image by using a first developer; and a second image forming part that forms a second developer image serving as a base or covering of the first developer image by using a second developer. In a case where the first developer image and the second developer image are superimposed and formed on an image-formed body by the first image forming part and the second image forming part, amount of the first developer that is used to form the first developer image is increased as compared to a case where the first developer image is formed on the image-formed body by the first image forming part without being superimposed with the second developer image.
    Type: Grant
    Filed: March 5, 2014
    Date of Patent: February 3, 2015
    Assignee: Oki Data Corporation
    Inventor: Hirotaka Ohshika
  • Patent number: 8942587
    Abstract: An electrostatic image developer includes a toner containing an external additive having a volume-average particle size of about 80 to 400 nm and an average circularity of about 0.7 to 0.85. The developer is used in an image forming apparatus including an image-carrying member having a top surface layer containing fluorocarbon resin particles, and a developer-carrying member that faces the image-carrying member and carries an electrostatic image developer, in which a value obtained by dividing the amount of developer on the developer-carrying member [g/m2] by a shortest distance between the image-carrying member and the developer-carrying member [?m] is about 0.8 to 1.8, and a peripheral velocity ratio of the developer-carrying member to the image-carrying member is about 1.5 to 5.0 or the developer-carrying member moves in a direction opposite to the image-carrying member in a facing portion.
    Type: Grant
    Filed: June 7, 2013
    Date of Patent: January 27, 2015
    Assignee: Fuji Xerox Co., Ltd.
    Inventors: Sakon Takahashi, Akihiro Iizuka, Motoko Sakai, Kunihiko Sato, Kazuhiko Arai, Nobumasa Furuya, Masaaki Takahashi, Daisuke Haruyama, Koji Nishimura
  • Publication number: 20150010317
    Abstract: According to one embodiment, an image forming apparatus includes an image forming portion configured to selectively form a toner image on an image bearing member using a developing device including a decolorizable toner or a developing device including an undecolorizable toner, a transfer portion configured to transfer the toner image, which is formed on the image bearing member, onto a transfer material, and a fixing portion configured to fix the toner image, which is transferred by the transfer portion, on the transfer material. The undecolorizable toner has at least a fixing temperature range in a range equal to or higher than a fixing temperature lower limit of the decolorizable toner and lower than decoloring temperature of the decolorizable toner.
    Type: Application
    Filed: August 26, 2014
    Publication date: January 8, 2015
    Inventor: Masato Ogasawara
  • Patent number: 8923714
    Abstract: This invention provides an apparatus and method capable of strictly keeping to a preset toner consumption amount and maintaining an image quality the user wants. A target toner save value used in toner save processing is set. In accordance with the set target toner save value, toner save processing is performed for data of the first page of image data formed from a plurality of pages. A toner save amount before and after toner save processing is calculated, and the difference value between the calculated toner save amount and the set target toner save value is calculated. Target toner save values for data of Nth and subsequent pages (N is an integer of 2 or more) of the image data formed from a plurality of pages are decided based on the calculated difference value of the target toner save value.
    Type: Grant
    Filed: October 25, 2012
    Date of Patent: December 30, 2014
    Assignee: Canon Kabushiki Kaisha
    Inventor: Osamu Iinuma