Temperature Control Patents (Class 399/69)
  • Patent number: 10712207
    Abstract: A temperature sensor that makes it possible to stably and accurately detect temperature irrespective of properties of a detection object surface, which includes a sensor holder extending from a front end side F toward a back end side B; and a sensor body that is held by the sensor holder to locate a thermosensitive device on the front end side F and from which lead wires that are electrically connected to the thermosensitive device are drawn toward the back end side B. The sensor body is supported by the sensor holder at both the front end side F and the back end side B.
    Type: Grant
    Filed: February 26, 2015
    Date of Patent: July 14, 2020
    Assignee: SHIBAAURA ELECTRONICS CO., LTD.
    Inventors: Takamasa Yoshihara, Michiru Takemura
  • Patent number: 10705465
    Abstract: In one example in accordance with the present disclosure, a method for determining fusing energy per page based on an applied voltage is described. According to the method, a resistance of a fusing system is acquired and an input voltage of a fusing system is estimated. A duty ratio of the fusing system is measured and a fusing energy per processed page is then determined based on the input voltage, the fusing system resistance, and the duty ratio of the fusing system. A media weight is then determined based on the fusing energy per processed page.
    Type: Grant
    Filed: January 25, 2017
    Date of Patent: July 7, 2020
    Assignee: Hewlett-Packard Development Company, L.P.
    Inventors: Bartley Mark Hirst, Mark Shaw
  • Patent number: 10698349
    Abstract: According to one embodiment, an image forming apparatus includes a fixing device and a control unit. The fixing device forms an image represented by print data on an image forming medium by causing a part or all of a plurality of heat generating cells to generate heat, and by fixing a developer image corresponding to the print data on the surface of the image forming medium. The control unit corrects image data before correction so as to reduce the number of heat generating cells which are caused to generate heat among the plurality of heat generating cells based upon an arrangement of an image represented by the image data before correction and an arrangement of the plurality of heat generating cells, and uses image data after correction obtained by correcting the image data before correction as the print data.
    Type: Grant
    Filed: September 10, 2019
    Date of Patent: June 30, 2020
    Assignee: TOSHIBA TEC KABUSHIKI KAISHA
    Inventor: Satoshi Katsumata
  • Patent number: 10691048
    Abstract: A control portion determines the lengths of time required to raise a plurality of heat generating elements to prescribed start-up completion target temperatures, and when a heat generating element determined to have the longest start-up requirement time among a plurality of heat generating elements is a second heat generating element, and a heat generating element determined to have shorter start-up requirement time than that of the second heat generating element among a plurality of heat generating elements is a first heat generating element, the control portion controls power to be supplied to the first heat generating element by changing a start-up control parameter for the first heat generating element with reference to the start-up performance of the second heat generating element.
    Type: Grant
    Filed: January 25, 2019
    Date of Patent: June 23, 2020
    Assignee: Canon Kabushiki Kaisha
    Inventor: Keisuke Mochizuki
  • Patent number: 10688816
    Abstract: A heated roller, in particular for a textile printer, comprising: a pair of stationary supports, an elongated tubular element located between said stationary supports and rotatably carried by said stationary supports about a longitudinal axis, a stationary infrared lamp extending inside said tubular element and having opposite ends supported by said stationary supports, a lamp support device extending between said stationary supports inside said tubular element and supporting the infrared lamp between said stationary supports, and an elastic device which applies an elastic tension to said lamp support device between said stationary supports in the direction of said longitudinal axis.
    Type: Grant
    Filed: October 15, 2018
    Date of Patent: June 23, 2020
    Assignee: ATPCOLOR S.R.L.
    Inventor: Roberto Maria Martellono
  • Patent number: 10671000
    Abstract: A fixing device includes a sensor driving unit that drives a temperature sensor to be movable in an axial direction of a fixing rotating body, and a sensor position control unit that controls the position of the temperature sensor by the sensor driving unit. The sensor position control unit performs sensor position control for setting a sheet size identified by a size identification unit as a reference sheet size and allowing the temperature sensor to be located within a passage area of a sheet having the reference sheet size and a non-passage area of a sheet having a sheet size smaller by one size than the reference sheet size.
    Type: Grant
    Filed: September 18, 2019
    Date of Patent: June 2, 2020
    Assignee: KYOCERA DOCUMENT SOLUTIONS INC.
    Inventor: Akihiro Kondo
  • Patent number: 10663902
    Abstract: There is disclosed an image post-processing method for adjusting glossiness of a fixed toner image. The image post-processing method includes a glossiness control step of, with a non-contact heating device, heating a toner image fixed to a recording medium so as to reduce glossiness of the toner image. The non-contact heating device is configured to heat the toner image fixed to the recording medium to a temperature which reduces the glossiness of the fixed toner image.
    Type: Grant
    Filed: November 9, 2018
    Date of Patent: May 26, 2020
    Assignee: KONICA MINOLTA, INC.
    Inventors: Haruo Horiguchi, Seijiro Takahashi, Toyoko Shibata
  • Patent number: 10656576
    Abstract: An image forming apparatus includes an image forming unit configured to form an image based on image data, a fixing unit configured to fix the image formed by the image forming unit on a recording material, a conversion unit configured to convert image data into conversion data including a plurality of areas having a first resolution in a main scanning direction perpendicular to a conveyance direction of the recording material, and a second resolution higher than the first resolution in a sub-scanning direction, which is the conveyance direction of the recording material, an analysis unit configured to analyze values related to the areas of the plurality of areas of the conversion data obtained by the conversion unit, and a temperature control unit configured to control a fixing temperature of the fixing unit according to a result of the analysis performed by the analysis unit.
    Type: Grant
    Filed: April 18, 2019
    Date of Patent: May 19, 2020
    Assignee: Canon Kabushiki Kaisha
    Inventors: Kohei Okayasu, Masashi Tanaka, Shingo Ito
  • Patent number: 10656575
    Abstract: A heating system includes a heater, a current sensor outputting a current monitoring signal indicating a current level of an alternating current power signal, and a switch providing alternating current to the heater. The heating system also includes a controller that controls operation of the switch. The controller activates the switch during a portion of a half cycle of the alternating current power signal having increasing amplitude. Upon the current monitoring signal reaching a predetermined threshold within the half cycle, the controller deactivates the switch. The heating system is useable within an image forming apparatus.
    Type: Grant
    Filed: March 26, 2019
    Date of Patent: May 19, 2020
    Assignee: BROTHER KOGYO KABUSHIKI KAISHA
    Inventor: Yuya Harada
  • Patent number: 10649381
    Abstract: An image forming apparatus includes a fixing unit having a first shielding member configured to change an opening width of a first opening with respect to a longitudinal direction, a second shielding member configured to change an opening width of a second opening with respect to the longitudinal direction, and a controller that controls, on the basis of an output of a detector and size information of the recording material, the opening widths of the first opening and the second opening, so as to correspond to widths of non-passing portions of the recording material in the nip, by moving the first shielding member and the second shielding member in the longitudinal direction, respectively, when the recording material, having a size other than the maximum size, is inserted into the fixing unit.
    Type: Grant
    Filed: September 20, 2018
    Date of Patent: May 12, 2020
    Assignee: Canon Kabushiki Kaisha
    Inventor: Yuji Mitsui
  • Patent number: 10642201
    Abstract: An image forming apparatus includes a controller that changes a rotating unit between a rotating state and a stop state, and a temperature of a heating portion to be a predetermined temperature by performing a heating operation. The controller performs, in order, a non-heating rotating process of setting the rotating unit in the rotating state, without controlling the temperature of the heating portion, after fixing the toner image on the recording material, a heating rotating process of controlling the temperature of the heating portion to be the predetermined temperature while setting the rotating unit in the rotating state, and a heating stopping process of controlling the temperature of the heating portion to be the predetermined temperature while setting the rotating unit in the stop state. The controller stops the heating operation in the heating stopping process after a predetermined period.
    Type: Grant
    Filed: September 7, 2018
    Date of Patent: May 5, 2020
    Assignee: Canon Finetech Nisca Inc.
    Inventor: Takahiro Ohnishi
  • Patent number: 10635033
    Abstract: In an image heating apparatus for heating an image formed on a recording material, a target temperature of heat generating elements corresponding to regions without an image when a recording material passes a nip portion is set in accordance with a length of the regions without an image in a longitudinal direction of a heater.
    Type: Grant
    Filed: May 14, 2019
    Date of Patent: April 28, 2020
    Assignee: Canon Kabushiki Kaisha
    Inventors: Naoto Tsuchihashi, Atsushi Iwasaki
  • Patent number: 10627750
    Abstract: A fixing device comprises a cylindrical sheet heating body for heating a sheet; a heat generation section which includes a center heat element that generates heat in a central area, a first heat element that generates heat in a first area containing an end in the length direction, and a second heat element that generates heat in a second area between the central area and the first area; a center temperature measurement section which measures a temperature of a portion of the sheet heating body; a both-end temperature measurement section which measures a temperature of the sheet heating body at a destination by moving in the length direction; and a power controller configured to control electric power to be supplied to the center heat element, to the first heat element, and to the second heat element according to the center temperature measurement section and the both-end temperature measurement section.
    Type: Grant
    Filed: January 23, 2019
    Date of Patent: April 21, 2020
    Assignee: TOSHIBA TEC KABUSHIKI KAISHA
    Inventor: Masao Ando
  • Patent number: 10628718
    Abstract: An image forming apparatus includes a temperature sensor, a holding unit that holds background temperature data that is obtained by the temperature sensor and indicates a temperature state in a surrounding of the image forming apparatus, an obtaining unit that obtains plural pieces of data generated by performing a calibration with respect to each of plural pieces of temperature data obtained by the temperature sensor after the background temperature data is held by the holding unit by using the background temperature data held by the holding unit, and a control unit that controls return of a state of the image forming apparatus from a power saving state based on the plural pieces of data obtained by the obtaining unit.
    Type: Grant
    Filed: March 27, 2015
    Date of Patent: April 21, 2020
    Assignee: Canon Kabushiki Kaisha
    Inventor: Takeru Imamura
  • Patent number: 10613458
    Abstract: An image forming apparatus includes: a fixing unit configured to fix a toner image to a sheet; a determination unit configured to determine, based on image data, a toner application amount corresponding to each of a plurality of regions in the sheet; and a control unit configured to weight the toner application amount of each of the plurality of regions with a region weight, and to control a temperature of the fixing unit based on the toner application amount of each of the plurality of regions that is weighted. The region weight is determined in accordance with a position of the region in the sheet in a conveyance direction of the sheet, and a region weight at a leading end in the conveyance direction is smaller than a region weight at a rear end in the conveyance direction.
    Type: Grant
    Filed: July 12, 2019
    Date of Patent: April 7, 2020
    Assignee: Canon Kabushiki Kaisha
    Inventor: Kenji Kasuya
  • Patent number: 10613457
    Abstract: According to one embodiment, a fixing device includes a heating rotator to contact a medium, such as a sheet of paper, on which a toner image has been disposed. A heater is inside the heating rotator to heat the medium. A pressurizing rotator is configured to press against the heating rotator to form a nip through which the medium passes. A controller is configured to drive the heater to heat the heating rotator to a target temperature. The controller is configured to set the target temperature according to a length of a standby time between an end of a first image forming process to a start of a second image forming process after the first image forming process.
    Type: Grant
    Filed: February 7, 2019
    Date of Patent: April 7, 2020
    Assignee: TOSHIBA TEC KABUSHIKI KAISHA
    Inventor: Katsutoshi Mita
  • Patent number: 10613500
    Abstract: A method for controlling a temperature of a heating element can include: measuring a temperature of the heating element using a temperature sensor; estimating a temperature of the heating element based on a heat transfer model of the heating element; calculating a variation of the estimated temperature and a variation of the measured temperature; and determining whether a failure of the temperature sensor occurs based on the calculated variation of the estimated temperature and the calculated variation of the measured temperature.
    Type: Grant
    Filed: June 8, 2018
    Date of Patent: April 7, 2020
    Assignees: Hyundai Motor Company, Kia Motors Corporation
    Inventors: Dong Hun Lee, Chang Seok You, Min Su Kang, Sung Do Kim
  • Patent number: 10606196
    Abstract: A fuser assembly includes a heated member and a backup member defining a fusing nip. Toner fuses to media in the nip at a fusing temperature and process speed during an imaging operation. Upon receipt of a command to commence imaging, a controller operates a heater to heat the fuser assembly to a first temperature less than the fusing temperature and operates a motor to rotate the fuser assembly at a speed lower than the process speed to prevent overheating the heated and backup members. Before a first media reaches the fusing nip, a speed of the motor is increased to the process speed to properly advance the media through the nip at the process speed. Upon the first media arriving at the fusing nip, the controller increases the temperature of the heater to a second temperature greater than the first temperature to prevent cold offset.
    Type: Grant
    Filed: April 11, 2019
    Date of Patent: March 31, 2020
    Assignee: LEXMARK INTERNATIONAL, INC.
    Inventors: Jichang Cao, Douglas Campbell Hamilton, Benjamin Karnik Johnson
  • Patent number: 10599076
    Abstract: An image forming apparatus includes: a fixer including a halogen heater; and a hardware processor that controls power supplied to the halogen heater, wherein the hardware processor switches, according to a state of the fixer, a control state for controlling the power supplied to the halogen heater between a first control state in which a lower limit of an amount of power per cycle of the power supplied to the halogen heater is set to a first value and a second control state in which the lower limit of the amount of power per cycle of the power supplied to the halogen heater is set to a second value lower than the first value.
    Type: Grant
    Filed: July 10, 2018
    Date of Patent: March 24, 2020
    Assignee: KONICA MINOLTA, INC.
    Inventor: Satoshi Hasegawa
  • Patent number: 10591854
    Abstract: An image forming apparatus includes a plurality of heater elements arranged in a direction perpendicular to a sheet transport direction to heat the sheet, a plurality of temperature sensors, each of which is configured to detect a temperature of one of the heater elements, and a controller configured to control each of the sensors to detect a first temperature before the sheet is passed by the corresponding heater element and a second temperature of the heater element after the sheet is passed by the corresponding heater element, and determine one or more of the heater elements to be energized based on the first temperatures and the second temperatures detected by the sensors.
    Type: Grant
    Filed: December 4, 2018
    Date of Patent: March 17, 2020
    Assignee: TOSHIBA TEC KABUSHIKI KAISHA
    Inventor: Masaya Arakawa
  • Patent number: 10571844
    Abstract: An image forming apparatus includes an image forming portion configured to form an image on a recording material, and a fixing portion including a first rotatable member and a second rotatable member, rotatable by rotation of the first rotatable member, and in contact with the first rotatable member. The fixing portion fixes the image on the recording material by heating the image while nipping and feeding the recording material, on which the image is formed, at a nip formed between the first rotatable member and the second rotatable member. A motor drives the first rotatable member, and torque detecting means detects a driving torque of the motor. On the basis of the driving torque detected by the torque detecting means, a controller controls a degree of temperature rise of the first rotatable member immediately before the recording material enters the nip.
    Type: Grant
    Filed: December 13, 2018
    Date of Patent: February 25, 2020
    Assignee: Canon Kabushiki Kaisha
    Inventors: Eiji Uekawa, Takao Izaki
  • 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: 10545435
    Abstract: An image heating apparatus includes a heater having a plurality of heat generating elements, a roller for forming a nip portion with the heater, an acquisition portion that acquires a plurality of count values indicating heat accumulation amounts of a plurality of heating regions heated by the plurality of heat generating elements, respectively, and a control portion that controls electrical power to be supplied to the plurality of heat generating elements to control individual heat generating quantities of the plurality of heat generating elements. The control portion controls the heat generating quantities so that a difference between a first count value indicating a heat accumulation amount of a first heating region heated by a first heat generating element and a second count value indicating a heat accumulation amount of a second heating region heated by a second heat generating element is maintained within a predetermined range.
    Type: Grant
    Filed: January 22, 2018
    Date of Patent: January 28, 2020
    Assignee: Canon Kabushiki Kaisha
    Inventors: Takahiro Uchiyama, Atsushi Iwasaki
  • Patent number: 10539912
    Abstract: An image forming apparatus includes a power controller that starts an examination mode by an external operation. The examination mode detects a temperature-resistance property of a resistive heat generator. The power controller supplies power at a predetermined power duty cycle to the resistive heat generator. The power controller obtains the power supplied to the resistive heat generator and a change in a temperature of the resistive heat generator, that is detected by a temperature detector, while the power controller supplies the power at the predetermined power duty cycle to the resistive heat generator. The power controller calculates the temperature-resistance property of the resistive heat generator based on the power and the change in the temperature that are obtained. The power controller adjusts a power duty cycle at which the power is supplied to the resistive heat generator based on the temperature-resistance property.
    Type: Grant
    Filed: April 23, 2019
    Date of Patent: January 21, 2020
    Assignee: Ricoh Company, Ltd.
    Inventors: Takamasa Hase, Tomoya Adachi, Yuusuke Furuichi, Yukimichi Someya, Masahiro Samei, Daisuke Inoue
  • Patent number: 10536995
    Abstract: An induction heating arrangement (1000) including four coils of a smaller diameter (1100, . . . , 1400) and a coil having a larger diameter (1500) is provided. The coils are arranged on a first plane (2100) and on a second plane (2200). In order to adapt a cooking area (1600) to the size of a pot, either the larger coil (1500) or one or more of the smaller coils (1100, 1400) are operated. A power supply circuitry (2400) is shared between the coils of the two planes. A selector (2300) disconnects a respective coil of the plane of coils that is not operated in order to avoid coupling, interference and loss of energy. Guiding elements of the magnetic flux (1110, 1115, 1540) confine the magnetic field in the area of the pot. A method of operating the induction heating arrangement is also provided.
    Type: Grant
    Filed: July 16, 2015
    Date of Patent: January 14, 2020
    Assignee: Electrolux Appliances Aktibolag
    Inventors: Michael Herzog, Marco Saporetti, Jurgen Leikam
  • Patent number: 10527982
    Abstract: An example apparatus includes a fuser slip detection portion to detect slip of a fuser, a temperature measurement portion to measure a temperature of the fuser, and a processor. The processor is to receive indication of a partial failure condition from the fuser slip detection portion determine a predicted complete failure condition when the indication of the partial failure condition corresponds to a temperature of the fuser that is below a temperature threshold, and generate an alert indicative of the predicted complete failure condition.
    Type: Grant
    Filed: July 22, 2016
    Date of Patent: January 7, 2020
    Assignee: Hewlett-Packard Development Company, L.P.
    Inventor: Darin Lindig
  • Patent number: 10520864
    Abstract: An image forming apparatus includes an image forming portion that forms an image on a recording material, and a fixing portion including a cylindrical heat transfer member, and a heating member contacting an inner surface of the heat transfer member. The fixing portion fixes the image on the recording material by heating the recording material, on which the image has been formed, by heat from the heating member through the heat transfer member. A control unit controls a target temperature of the heating member, and analyzes whether or not a plurality of pixels, of image data corresponding to the image to be formed on the recording material, in each interval corresponding to a circumferential length of the heat transfer member, with respect to a recording material feeding direction, are pixels for forming an image with a predetermined density or more, and sets the target temperature depending on an analyzation result.
    Type: Grant
    Filed: October 3, 2018
    Date of Patent: December 31, 2019
    Assignee: Canon Kabushiki Kaisha
    Inventors: Sho Taguchi, Masashi Tanaka, Tatsuya Kinukawa, Naofumi Murata
  • Patent number: 10520866
    Abstract: A fixing apparatus includes a plurality of heat generating elements for heating a developer image formed on a recording medium corresponding to a plurality of heating regions. A first target temperature of the heat generating elements is set based on a developer amount per unit area of the developer image in each of the heating regions, and the temperature of the heat generating elements is controlled to the first target temperature. If a difference between the first target temperatures for two adjacent heating regions is outside of a predetermined range, the first target temperature for one of the two adjacent heating regions is corrected to a second target temperature, which is greater than the first target temperature, so that the difference between the first target temperatures for the two adjacent heating regions is within the predetermined range.
    Type: Grant
    Filed: March 29, 2019
    Date of Patent: December 31, 2019
    Assignee: Canon Kabushiki Kaisha
    Inventors: Takashi Nomura, Takahiro Uchiyama, Atsushi Iwasaki
  • Patent number: 10520862
    Abstract: An image heating apparatus includes a first rotatable member and a second rotatable member, which are configured to form a nip in which a toner image is fixed on a recording material, an air blowing mechanism, and a duct configured to guide air from the air blowing mechanism toward an end portion of the first rotatable member with respect to a longitudinal direction of the first rotatable member. The image heating apparatus also includes an opening and closing mechanism configured to open and to close an air blowing port of the duct. The opening and closing mechanism includes a plurality of shutter members configured to close the air blowing port in cooperation with each other.
    Type: Grant
    Filed: November 13, 2018
    Date of Patent: December 31, 2019
    Assignee: Canon Kabushiki Kaisha
    Inventors: Takuya Hasegawa, Masahiro Takahashi, Satoshi Ishikawa
  • Patent number: 10514638
    Abstract: A fixing device includes a first rotatable member and a second rotatable member for forming a nip for fixing a toner image on a recording material, a heating portion for heating the first rotatable member, a first sensor for detecting a temperature of a longitudinally central portion of the first rotatable member, a second sensor for detecting a temperature of one longitudinal end portion of the first rotatable member, and a controller for controlling energization to the heating portion using a detection temperature of the first sensor and a detection temperature of the second sensor in a case that the recording material is an envelope having a predetermined width or more.
    Type: Grant
    Filed: December 12, 2018
    Date of Patent: December 24, 2019
    Assignee: Canon Kabushiki Kaisha
    Inventor: Daigo Matsuura
  • Patent number: 10514636
    Abstract: An image heating apparatus includes a heater having a plurality of resistors, and a power supply control circuit that controls power supplied to the plurality of resistors so as to selectively heat a plurality of heating regions. A plurality of thermistors detect a temperature of each of a plurality of regions of the image heater, and a processor functions as a current amount correcting portion that corrects an amount of current supplied to the plurality of resistors. The current amount is corrected based on the temperature detected by each of the plurality of thermistors, so that a difference of a temperature rising amount per unit time among the plurality of heating regions at the start of an image heating operation becomes small and a total amount of power supplied to the plurality of heat generating elements is kept to within a predetermined limited power amount.
    Type: Grant
    Filed: July 31, 2018
    Date of Patent: December 24, 2019
    Assignee: Canon Kabushiki Kaisha
    Inventor: Kenji Takagi
  • Patent number: 10509346
    Abstract: An image forming apparatus includes a fixing device, a controller, and a storage. The fixing device includes a fixing part that fixes a toner image on a sheet, a heating part that heats the fixing part, and a detecting part that detects an actual temperature of the fixing part. The controller controls the actual temperature of the fixing part based on a target temperature of the fixing part and a cumulative deviation of the actual temperature of the fixing part. The storage stores a convergence value of the cumulative deviation. Every time a heating operation to the fixing part by the heating part is executed, the controller updates the convergence value of the cumulative deviation stored in the storage by a convergence value of the cumulative deviation of a latest heating operation.
    Type: Grant
    Filed: November 21, 2018
    Date of Patent: December 17, 2019
    Assignee: KYOCERA Document Solutions Inc.
    Inventor: Masato Mori
  • Patent number: 10503103
    Abstract: An image heating apparatus includes an image heating portion including first, second, and third heat generating blocks divided in a direction orthogonal to a conveying direction of the recording material. The image heating apparatus also includes a first driving circuit, a second driving circuit, a first temperature detection member, and a second temperature detection member. A control portion controls the first and second driving circuits according to at least one of the temperatures detected by the first and second temperature detection members, and controls energization of the second heat generating block together with a heat generating block that is energized by a driving circuit connected to the second heat generating block. In addition, a connection switching portion selectively connects any one of the first and second driving circuits to the second heat generating block according to a switching instruction from the control portion.
    Type: Grant
    Filed: July 24, 2017
    Date of Patent: December 10, 2019
    Assignee: Canon Kabushiki Kaisha
    Inventor: Ryota Ogura
  • Patent number: 10503106
    Abstract: An image forming apparatus includes: a heating member configured to heat a sheet; a heat source configured to heat the heating member; a temperature sensor configured to acquire a temperature of the heating member; a switching circuit configured to supply a current to the heat source by switching a voltage inputted from an alternating-current power source between an energization state and a non-energization state; and a controller. The controller executes: print processing of forming an image on the sheet; first energization processing of supplying the current to the heat source after a printing command is received and before the print processing is started; and second energization processing of setting a duty ratio of an output current of the switching circuit based on a detection result of the temperature sensor so that the heating member has a fixing temperature and supplying the current to the heat source, in the print processing.
    Type: Grant
    Filed: August 9, 2018
    Date of Patent: December 10, 2019
    Assignee: Brother Kogyo Kabushiki Kaisha
    Inventor: Sadaharu Kato
  • Patent number: 10488796
    Abstract: A fixing device controller includes a plurality of voltage detectors to detect voltages of a plurality of power sources for supplying power to a plurality of heaters to heat a fixing member of a fixing device that fixes a toner image on a recording medium and a heater controller to execute duty control to turn on the plurality of heaters. The heater controller corrects a duty of at least one of the plurality of heaters based on the voltages detected by the plurality of voltage detectors and rated output values of the plurality of heaters.
    Type: Grant
    Filed: June 28, 2018
    Date of Patent: November 26, 2019
    Assignee: Ricoh Company, Ltd.
    Inventors: Teppei Kawata, Shinichi Namekata, Akiyasu Amita, Masateru Ujiie, Yohhei Watanabe, Fumihiro Hirose, Takashi Sakamaki
  • Patent number: 10488794
    Abstract: In a case where fixing processing ends in a state where a power supply line is switched by a switching unit according to a first print command so that power is suppliable to a second heating element, the switching unit switches the power supply line from the second heating element to a first heating element so that power is suppliable to the first heating element, the switching occurring regardless of presence or absence of reception of a second print command subsequent to the first print command.
    Type: Grant
    Filed: November 19, 2018
    Date of Patent: November 26, 2019
    Assignee: Canon Kabushiki Kaisha
    Inventors: Kohei Wakatsu, Kazuhiro Doda, Tsuguhiro Yoshida, Yutaka Sato, Ken Oi
  • Patent number: 10474072
    Abstract: A fixing apparatus comprises a rotating body that conveys a sheet in a first direction, first and second heating sections, and first and second temperature detectors. In the first heating section, a calorific value per unit length in a second direction orthogonal to the first direction, at the center of the first heating section is larger than that at both ends thereof. In the second heating section, a calorific value per unit length in the second direction, at both ends of the second heating section is larger than that at the center thereof. The first temperature detector is configured to detect a temperature of a central part of a heating area of the rotating body heated by one of the first and second heating sections. The second temperature detector is configured to detect a temperature outside of the heating area of the rotating body.
    Type: Grant
    Filed: March 15, 2018
    Date of Patent: November 12, 2019
    Assignees: KABUSHIKI KAISHA TOSHIBA, TOSHIBA TEC KABUSHIKI KAISHA
    Inventor: Katsutoshi Mita
  • Patent number: 10444678
    Abstract: A fixing device includes a fixing unit having heat sources each extending in a longitudinal direction thereinside, and sensors that measure a surface temperature of the fixing unit. The heat sources are provided at different positions in a projection diagram of the fixing device seen in a rotational-axis direction of the fixing unit. A first measurement position for a first sensor is different in the peripheral direction from a second measurement position for a second sensor. A sum of a first distance between the first measurement position and a first heat source nearest to the first measurement position and a second distance between the second measurement position and a second heat source nearest to the second measurement position is smaller than a sum of the first and second distances in a case where the second measurement position coincides with the first measurement position in the peripheral direction.
    Type: Grant
    Filed: August 30, 2018
    Date of Patent: October 15, 2019
    Assignee: FUJI XEROX CO., LTD.
    Inventor: Akio Miyazaki
  • Patent number: 10437185
    Abstract: An image heating apparatus includes a controller configured to control a temperature at which energization to a heater is turned off, depending on a detection temperature of a detecting portion, wherein, when a temperature rise rate per unit time of the detection temperature of the detecting portion is a first rise rate, the controller turns off the energization to the heater in response to the detection temperature reaching a first temperature, and, when the temperature rise rate per unit time is a second rise rate that is less than the first rise rate, the controller turns off the energization to the heater in response to the detection temperature reaching a second temperature that is greater than the first temperature.
    Type: Grant
    Filed: May 24, 2018
    Date of Patent: October 8, 2019
    Assignee: Canon Kabushiki Kaisha
    Inventors: Yusuke Yamaguchi, Masayuki Tamaki, Hiroki Kawai, Ikuo Nakamoto
  • Patent number: 10416596
    Abstract: A fixing device includes a fixing member, a pressuring member, a temperature sensing part and an air blow controlling part. The fixing member heated by a heat source heats a toner image on the recording medium. The temperature sensing part includes an infrared sensing element sensing infrared rays from the fixing member and a condensing member condensing the infrared rays to the infrared sensing element. The air blow controlling part executes and stops the air blow to the temperature sensing part. Detection temperature of the fixing member is calculated with a sensing value by the infrared sensing element. The detection temperature or control temperature of the heat source is corrected with air blow condition by the air blow controlling part and temperature deference between the infrared sensing element and the condensing member. Heating of the fixing member is controlled with the corrected detection temperature or the corrected control temperature.
    Type: Grant
    Filed: August 10, 2018
    Date of Patent: September 17, 2019
    Assignee: KYOCERA Document Solutions Inc.
    Inventors: Ryohei Tokunaga, Taro Kurahashi
  • Patent number: 10401765
    Abstract: A heater includes a plurality of heating blocks in a substrate having a plurality of temperature detection elements disposed therein. In a case where one of the heating blocks is caused to generate heat alone, temperature distribution of the heating block in a longitudinal direction is inclined from a center part to an edge. One of the plurality of temperature detection elements is arranged in a region in which the temperature distribution is inclined.
    Type: Grant
    Filed: February 28, 2018
    Date of Patent: September 3, 2019
    Assignee: Canon Kabushiki Kaisha
    Inventors: Takahiro Uchiyama, Atsushi Iwasaki, Takashi Nomura
  • Patent number: 10377129
    Abstract: A printing apparatus includes an ejecting head that ejects ink droplets onto a surface of a printing medium (paper roll), a carriage on which the ejecting head is mounted, a platen that faces the ejecting head and supports the printing medium, a detector plate provided in the carriage and is displaced in accordance with an external force applied in response to contact with the printing medium, and an encoder that measures a displacement amount of the detector plate and outputs an output value corresponding to the displacement amount.
    Type: Grant
    Filed: January 26, 2018
    Date of Patent: August 13, 2019
    Assignee: Seiko Epson Corporation
    Inventor: Yugo Ishikawa
  • Patent number: 10365572
    Abstract: An image forming apparatus includes a printer and a controller. The printer transfers an image formed by attaching toner to an electrostatic latent image onto a sheet, heats and presses the sheet onto which the visible image is transferred to fix the image onto the sheet, and thereby forms an image on the sheet. The controller controls the printer to form an image for a second surface, and then to form an image for a first surface which differs from a surface on which the image for the second surface is formed, when the controller determines that duplex printing, in which decolorable toner is used on the first surface on which an image is first formed, and toner having a fixing temperature higher than a decolorizing temperature is used on the second surface, is set in printing job data.
    Type: Grant
    Filed: June 1, 2018
    Date of Patent: July 30, 2019
    Assignee: TOSHIBA TEC KABUSHIKI KAISHA
    Inventor: Natsuko Okuzono
  • Patent number: 10365594
    Abstract: An apparatus includes a fuser assembly including a heater member. The heater member includes at least one heating element and at least one temperature sensor to sense a temperature of the heating element. A first power control unit is coupled to the at least one temperature sensor and operative to calculate at least one power level for the at least one heating element based upon at least one set-point temperature therefor and the temperature sensed by the at least one temperature sensor. A second power control unit is coupled to the first power control unit, receives the calculated at least one power level and selects, based upon the calculated power level, at least one actual power level from a stored plurality of predetermined power levels. The second power control unit controls a power for the at least one heating element based upon the selected at least one actual power level.
    Type: Grant
    Filed: May 25, 2018
    Date of Patent: July 30, 2019
    Assignee: LEXMARK INTERNATIONAL, INC.
    Inventor: Jichang Cao
  • Patent number: 10353341
    Abstract: An image forming apparatus comprises a fuser to fuse a print sheet having a surface on which toner is developed, the fuser including a heating element, and a controller to control a number of waveforms of an alternating current (AC) power to be supplied to the heating element, within a control cycle to control the fuser to fuse the print sheet at a target temperature and to vary the control cycle, according to a temperature of the fuser.
    Type: Grant
    Filed: March 12, 2018
    Date of Patent: July 16, 2019
    Assignee: HP PRINTING KOREA CO., LTD.
    Inventors: Hwa-chul Choi, Yun-su Kim
  • Patent number: 10345745
    Abstract: An image forming apparatus includes an image forming portion, a first fixing member, and a second fixing member that forms a nip with the first fixing member. An air blowing device blows air for cooling an end portion region of at least one of the first and second fixing members with respect to a longitudinal direction, perpendicular to a recording material feeding direction, in the nip. In addition, a controller capable of selecting one of an operation in a first mode, in which cooling of the end portion region by the air blowing device is carried out depending on a recording material size, with respect to a widthwise direction of the recording material, and an operation in a second mode, in which the cooling is carried out depending on a size of a print region of the image, with respect to a direction perpendicular to the recording material feeding direction.
    Type: Grant
    Filed: June 6, 2018
    Date of Patent: July 9, 2019
    Assignee: Canon Kabushiki Kaisha
    Inventors: Hirokazu Okugawa, Tohru Saito
  • Patent number: 10338506
    Abstract: A fixing device includes: a fixing rotator; a pressure rotator configured to be pressed into contact with the fixing rotator to form a nip portion; a heating section configured to be provided over an outer circumference of the fixing rotator in a non-contact manner with the fixing rotator and heat the fixing rotator; and a power shutdown section configured to shut down power supply to the heating section when temperature becomes higher than a predetermined setting temperature, wherein the heating section includes an infrared heater and a reflection member which covers the infrared heater and whose portion facing the fixing rotator is an opening portion, a longitudinal length of the reflection member is longer than a length in an axis direction of a light emitting unit of the infrared heater, and a temperature detection unit of the power shutdown section is arranged outside the reflection member.
    Type: Grant
    Filed: April 27, 2016
    Date of Patent: July 2, 2019
    Assignee: Konica Minolta, Inc.
    Inventors: Koji Yamamoto, Mamoru Fukaya, Toru Hayase
  • Patent number: 10338495
    Abstract: There is demand to reduce the amount of developing agent fed to a cleaning member. The amount of developing agent that is fed to the cleaning member is decided based on the amount of developing agent recovered by the cleaning member or the amount of use of a process cartridge.
    Type: Grant
    Filed: February 15, 2018
    Date of Patent: July 2, 2019
    Assignee: Canon Kabushiki Kaisha
    Inventor: Satoru Motohashi
  • Patent number: 10317825
    Abstract: An image formation apparatus includes a fixing device, a heater driver, and a controller. The fixing device includes: a heater; a heating member; and a temperature sensor which outputs a signal depending on a temperature of the heater or the heating member. When a target temperature of the heater or the heating member changes from a first target temperature to a second target temperature lower than the first target temperature and before a detection temperature becomes equal to or lower than a first switching temperature which is equal to or lower than the second target temperature, the controller sets control value of the heater by on/off control or proportional control. After the detection temperature becomes equal to or lower than the first switching temperature, the controller sets control value of the heater by proportional-integral control.
    Type: Grant
    Filed: November 27, 2017
    Date of Patent: June 11, 2019
    Assignee: BROTHER KOGYO KABUSHIKI KAISHA
    Inventor: Kenichi Iesaki
  • Patent number: 10310422
    Abstract: A fixing apparatus feeds a sheet that is unfixed through a nip formed between a heating member and a pressurizing member to thermally fix the sheet, and includes a cooler that cools the pressurizing member, wherein when a fixing job is performed on a sheet whose sheet width is a second width larger than a first width, after a fixing job is completed on a sheet whose sheet width in an orthogonal direction to a sheet feeding direction is the first width, the cooler cools a difference region in which a first sheet feeding region of the pressurizing member through which the sheet having the first width is fed and a second sheet feeding region through which the sheet having the second width is fed are not overlapped with each other, with a cooling power stronger than that of a region corresponding to the first sheet feeding region.
    Type: Grant
    Filed: July 11, 2018
    Date of Patent: June 4, 2019
    Assignee: Konica Minolta, Inc.
    Inventors: Tomomi Izawa, Mitsuru Satou, Kenji Sawada