Abstract: An image forming apparatus includes a pressing device, an apparatus body, an opening body, and a vibration insulator. The pressing device housed in the apparatus body is configured to press a pressing body to a pressing target body. The opening body is configured to open and close to the apparatus body. The opening body presses a pressing target portion of the apparatus body, at a first pressing portion to cancel a pressing state of the pressing device by opening of the opening body and at a second pressing portion to enter the pressing state of the pressing device by closing of the opening body. The vibration insulator is provided on at least one of the pressing target portion and the second pressing portion, at a contact portion at which the pressing target portion contacts the second pressing portion when the first pressing portion cancels the pressing state.
Abstract: A heater controller and heater control method is disclosed. The hater controller includes a detector, a determination circuit, a limiting circuit, a selection circuit, and a driving circuit. The detector detects a temperature of the heating object, which is heated by the heater. The determination circuit determines turn-on ratio for the heater for every control cycle of AC voltage, based on the surface temperature of the heating object and a target temperature of the heating object. The limiting circuit limits the turn-on ratio of current control cycle when the control method of previous control cycle is phase control. The selection circuit selects control pattern to control the heater, based on the turn-on ratio, and the driving circuit applies a heater driving signal to the heater.
Abstract: Provided is a pressure roller for an image heating device that forms a nip part together with a heating member, the pressure roller including at least a mandrel, a first elastic layer, and a second elastic layer provided between the mandrel and the first elastic layer, wherein the first elastic layer has open-cell voids, is made of rubber, and has a thickness of at least 50 ?m and less than 500 ?m, and the second elastic layer is made of solid rubber.
July 18, 2018
Date of Patent:
January 28, 2020
CANON KABUSHIKI KAISHA
Shoichiro Ikegami, Naofumi Murata, Yutaka Arai, Jun Miura
Abstract: In a heater according to the present invention, one of conductive lines is arranged to extend from a temperature detection element toward one end portion of a substrate in a lengthwise direction of the substrate, whereas the other the conductive line is arranged to extend from the temperature detection element toward the other end portion of the substrate in the lengthwise direction of the substrate, and at least one of the two conductive lines has an area that is inclined in both of the lengthwise direction and the widthwise direction of the substrate.
Abstract: A fixing apparatus includes a controller that determines a duty ratio of a drive signal to be a first duty ratio if an alternating voltage of a commercial alternating current power supply detected by a voltage detector is less than a predetermined voltage, and to determine the duty ratio of the drive signal to be a second duty ratio, which is less than the first duty ratio, if the alternating voltage is greater than the predetermined voltage. The controller also supplies the drive signal, set to the determined duty ratio, to a driving circuit if a temperature detected by a temperature detector is less than a first temperature, and not to supply the drive signal to the driving circuit if the temperature detected by the temperature detector is not less than the first temperature.
Abstract: An image heating apparatus includes a first and second heat generating elements, a thyristor that controls electrical power supplied to the heat generating elements, and a relay that switches a supply destination of the electrical power supply between the heat generating elements. A controller switches the thyristor from on to off, and then actuates the relay to switch the supply destination from the first heat generating element to the second heat generating element, and, thereafter switches the thyristor from off to on. The controller sets a timing of switching of the thyristor from on to off to be in a period in which an image on a current recording material is in a nip, and sets timing of switching of the thyristor from off to on to be in a period in which an image on a current recording material or a subsequent recording material is not in the nip.
Abstract: According to one embodiment, a fixing device includes determination means for determining a size of an image forming area of a medium, heating means for including an endless rotating body, plural heat-generating members which are formed in a perpendicular direction to a transport direction and divided by a predetermined length, and are disposed so as to come into contact with an inner side of the rotating body, and a switching unit which switches individual conduction of these heat-generating members, and heats the medium, pressing means for forming a nip by performing pressing and contact at a position of the plural heat-generating members, and nipping and carrying the medium in the transport direction along with the heating means, and heating control means for controlling the switching unit to select and conduct heat-generating members and controlling the heating means to heat the medium.
Abstract: The present invention relates to a system (100) for controlling a temperature, the system (100) comprising: a temperature sensor module (10), which is configured to measure a temperature value; a microcontroller module (20), which is coupled to the temperature sensor module (10) and which is configured to generate AC heating pulse signals by separate sequential code steps based on the measured temperature value; a coupling module (30) which is coupled to the microcontroller module (20) and which is configured to transform the generated AC heating pulse signals into transformed AC heating pulse signals using a transfer function which is substantially zero for DC signal components; and a heating module (40) which is coupled to the coupling module (30) and which is configured to generate heat according to the transformed AC heating pulse signals.
October 28, 2015
Date of Patent:
January 7, 2020
Koninklijke Philips N.V.
Josephus Arnoldus Henricus Maria Kahlman
Abstract: An air filter for an image forming apparatus includes a housing including an air intake part and an air exhaust part, a fan disposed in the housing to form an air flow from the air intake part to the air exhaust part, and a filter disposed in the housing to filter the air flow. The fan draws air in a suction direction along an ejection direction of a sheet ejected from an ejection port in the image forming apparatus.
Abstract: An image heating apparatus includes a heater including a first heat generating block and a second heat generating block, and a power control portion that controls electrical power to be supplied to the respective heat generating blocks. When a recording material passes the position of the heater, and, in a longitudinal direction of the heater, when an entire range in which the second heat generating block is provided is a range in which the recording material passes and only a portion of a range in which the first heat generating block is provided is a range in which the recording material passes, the power control portion controls the electrical power to be supplied to the respective heat generating blocks so that electrical power Wd supplied to the first heat generating block is less than electrical power Wc supplied to the second heat generating block.
Abstract: The present invention relates to a fixing apparatus including a tubular film, a heater provided at an inside of the film, a protection element provided at the inside of the film, and at least one conductive member provided at the inside of the film. The protection element includes two terminals and a switch that turns off to shut off power to the heater when the heater abnormally generates heat. A first end of the conductive member is electrically connected to one of the terminals of the protection element. The conductive member is not coated with an insulator, and a second end of the conductive member projects out of the film so that the cost of the fixing apparatus is reduced.
January 29, 2019
Date of Patent:
November 19, 2019
CANON KABUSHIKI KAISHA
Keisuke Fujita, Naoki Hayashi, Masaaki Takeuchi, Koji Fujinaka
Abstract: A heater of the present invention includes jointed heat generating resistors having a positive temperature characteristic of resistance and provided between a first conductive element and a second conductive element on a substrate in a longitudinal direction of the substrate, and a plurality of heating blocks provided in the longitudinal direction, each of which is a set of the first conductive element, the second conductive element, and the heat generating resistor, and power supplied to at least one of the plurality of heating blocks can be controlled independent of other heating blocks.
Abstract: Provided is a fixing device for preventing an increase in torque when a fixing belt starts to be driven. The fixing device may include a fixing belt that is rotatable; a pressure roller configured to pressure-contact an outer circumferential surface of the fixing belt and to form a fixing nip portion between the pressure roller and the fixing belt. A contact member is located inside the fixing belt and includes a contact portion that contacts an inner circumferential surface of the fixing belt. The contact portion includes a surface having a plate shape that faces the pressure roller and a plurality of protrusions that protrude from the surface toward the pressure roller.
Abstract: A heater used in a fixing device includes a substrate, a first heat generation resistor, a second heat generation resistor with a gap to the first heat generation resistor in the longitudinal direction, a first conductive pattern, a second conductive pattern, and the third conductive pattern, wherein a width of at least one of the first and second heat generation resistors in the transverse direction in a first area adjacent to the gap is smaller than the width in a second area, arranged adjacent to the first area, farther from the gap in the longitudinal direction than the first area.
Abstract: A cylindrical fixing member for use with a fixing device includes a heat generating layer and an electrode layer contacting the heat generating layer. The electrode layer is smaller in volume resistance value than the heat generating layer. The electrode layer is formed in a helical shape so that a helical axis thereof extends in a direction along a generatrix direction of the fixing member. One end and the other end of the electrode layer are electrically open.
Abstract: An image forming apparatus includes a developing section, a transfer section, and a fixing section. The developing section attaches a metal-containing toner to a latent image, and attaches a non-metal-containing toner to the latent image. The transfer section transfers, onto an intermediate transfer medium, the metal-containing toner and transfers, onto a print medium, the metal-containing toner. The transfer section transfers, onto the intermediate transfer medium, the non-metal-containing toner and transfers, onto the print medium, the non-metal-containing toner. The fixing section fixes, to the print medium, the metal-containing toner, and fixes, to the print medium, the non-metal-containing toner. The fixing section causes a temperature at which the metal-containing toner is fixed to the print medium to be lower than a temperature at which the non-metal-containing toner is fixed to the print medium.
Abstract: A fixing device includes a rotatable fixing belt; a contact portion that comes into contact with an inner peripheral surface of the fixing belt in a width direction; a holding portion disposed opposite the inner peripheral surface to guide and hold the fixing belt; a pressing unit that presses the fixing belt against the contact portion; a protrusion disposed at a portion of the holding portion upstream of the contact portion in a rotation direction of the fixing belt to come into contact with the inner peripheral surface in the width direction; a gap forming portion that forms a gap at a portion of the holding portion between the protrusion and the contact portion, the gap extending in the width direction of the fixing belt without allowing the fixing belt to come into contact with the holding portion; and a lubricant applied to the inner peripheral surface.
Abstract: A fixing device includes a cylindrical belt, a nip portion forming member contacting the belt, a halogen heater including a bulb filled with gas and having a sealing portion sealing the bulb, a filament inside the bulb and having a light emission portion, an external lead extending to outside the halogen heater, and a metal body arranged in the sealing portion and electrically connected the filament and the external lead, and a reflection member reflecting the radiation light of the halogen heater toward the nip portion forming member, the reflection member being long in a longitudinal direction of the halogen heater, wherein a longitudinal end of the reflection member is configured to lie in an area between an end of a light emission area constituted by the light emission portion of the halogen heater and the metal body in the longitudinal direction of the halogen heater.
Abstract: A controller of an image heating apparatus executes a first heater control operation, when a sheet having a width such that the sheet passes both a position of a first temperature detector and a position of a second temperature detector, is heated in a nip, for controlling power supply to a heater so that a temperature detected by the second temperature detector is maintained at a heater target temperature, and a second heater control operation, when a sheet having a width such that the sheet passes through the position of the first temperature detector, but does not pass through the position of the second temperature detector, is heated in the nip, for controlling the power supply to the heater, so that the temperature detected by the first temperature detector, irrespective of the temperature detected by the second temperature detector, is maintained at a film target temperature.
Abstract: An image forming apparatus includes a heat generation member to heat a recording material placed on a placement portion, an image forming unit, a detecting unit, a measuring unit, a storage unit, and a control unit. The image forming unit forms an image on the recording material conveyed from the placement portion. The detecting unit may detect information about a recording material characteristic. The measuring unit may measure a moisture content around the image forming apparatus as information. The storage unit stores information about a moisture content around the placement portion when the heat generation member is energized. When the heat generation member is not energized, the control unit sets an image forming condition based on an obtained detection result and measuring unit information. When the heat generation member is energized, the control unit sets the image forming condition based on the obtained detection result and the stored information.
Abstract: A fixing device includes a cylindrical film a pressing member, and a preventing member including a preventing surface configured to prevent movement of the film in a longitudinal direction, and a film rotation guiding surface. As viewed in the longitudinal direction of the film, the preventing surface includes first and second regions positioned downstream and upstream, respectively, of a nip center line with respect to a recording material feeding direction. The first region retracts from a longitudinal film end surface relative to the second region. The second region continuously extends in the recording material feeding direction from a portion upstream of the nip center line to a portion downstream of the nip center line, and has a length, with respect to a rotational direction of the film, that is greater at the portion upstream of the nip center line than at the portion downstream of the nip center line.
Abstract: An imaging device includes a controller and fuser assembly. The fuser assembly has a heat transfer and backup member defining a nip and process direction of media travel. The heat transfer member includes a resistive trace with a length twice extending transverse to the process direction. The controller selectively applies AC power to the resistive trace. The controller calculates a power level from zero power to full power to heat the trace to a predetermined set-point temperature from a measured current temperature. The controller maps the calculated power level to one of only eight actual heating power levels that become applied or not to the resistive trace to achieve a desired power flicker and harmonics response otherwise unattainable by merely applying the calculated power level. The actual heating power levels include differing numbers of consecutive half-cycles of AC power and are applied at zero-crossings thereof.
Abstract: According to one embodiment, a fixing device includes determination means for determining the size of a medium, heating means for including plural heat-generating members which are two-dimensionally arranged such that the heat-generating members are lined up along two parallel lines or more which are vertical to a transport direction of the medium and divided at locations on the parallel lines, and are disposed so as to come into contact with an inner side of the rotating body, and a switching unit which switches individual conduction, and heats the medium, pressing means for forming a nip by performing pressing and contact at a position of the plural heat-generating members, and heating control means for selecting a group of the heat-generating members which are lined up in the two-dimensional arrangement, conducting the selected group of the heat-generating members, and controlling the heating means.
Abstract: An image formation apparatus according to one or more embodiments may include: a first conveyer; a second conveyer provided downstream of the first conveyer; a detector that detects a deflection of the medium between the first and second conveyers; a speed controller that controls a speed of the second conveyer within a first speed range; a calculator that calculates an average convey speed of the second conveyer. The calculator calculates a first average speed in a first period from when a leading end of the medium reaches the second conveyer to when the medium is conveyed a predetermined distance from the second conveyer. The speed controller changes, after the first period elapses, the speed of the second conveyer within a second speed range with the calculated first average convey speed as a criteria speed of the second conveyer, based on the detection result from the detector.
Abstract: The present invention relates to an image heating apparatus that includes a heater including a plurality of independently controllable heating blocks in a longitudinal direction thereof, each including a first conductor, a second conductor, and a heating element. At least one of electrodes corresponding to the respective heating blocks is disposed in an area where the heating element is located in the longitudinal direction on a second surface of the heater that is opposite to a first surface that comes into contact with an endless belt. An electrical contact is arranged so as to face the second surface of the heater. An overheating occurring in a no-media passage portion when an image formed on a recording material having a small size is heated is suppressed or reduced.
March 17, 2015
Date of Patent:
September 17, 2019
Canon Kabushiki Kaisha
Yasuhiro Shimura, Koji Nihonyanagi, Ryota Ogura
Abstract: A control circuit includes a memory interface and a power interface. The control circuit is configured to: read out identifiers and voltage values from a memory via the memory interface, the memory storing the identifiers and the voltage values associated with the identifiers, the identifiers identifying actuators for jetting liquid, the voltage values corresponding to values of voltages to be supplied to the actuators; based on the voltage values, associate each of the identifiers with one of power circuits; detect whether failure occurs in any of the power circuits via the power interface communicated with the power circuits each changeable in output voltage; and based on detection of the failure occurring in any power circuits, associate specified identifiers with a non-failure power circuit in which the failure does not occur, the specified identifiers associated with a failure power circuit in which the failure is detected.
Abstract: A fixing device includes a tubular rotator and a first heater disposed inside the tubular rotator and extended in a longitudinal direction of the first heater. The first heater heats the tubular rotator. A second heater is disposed inside the tubular rotator and extended in a longitudinal direction of the second heater. The second heater heats the tubular rotator. A heating adjuster is interposed between the first heater and the second heater. The heating adjuster adjusts heat conduction from the first heater to the second heater. A joint combines the heating adjuster with the second heater.
August 14, 2017
Date of Patent:
August 27, 2019
RICOH COMPANY, LTD.
Fumihiro Hirose, Keisuke Kubota, Masami Okamoto, Jun Ogino, Kensuke Yamaji, Shuutaroh Yuasa, Yuuta Kanda
Abstract: An inkjet recording apparatus includes an ejection head configured to eject an ink to form an image, a head heater configured to heat the ejection head to a temperature T1 and a control unit configured to control the temperature of the ejection head and the temperature at an image forming position by the ejection head. The control unit controls heating of the ejection head by the head heater and the temperature at the image forming position in such a way that the temperature of the ejection head is higher than the temperature at the image forming position.
Abstract: A belt unit for forming a heating nip portion configured to heat a toner image in cooperation with a rotary member facing the belt unit, includes an endless belt, an nip forming member provided along a longitudinal direction of the endless belt on an inner side of the endless belt and configured to contact to an inner surface of the endless belt for forming the heating nip portion, a regulation member configured to regulate a position of the endless belt in the longitudinal direction, and a snap-fit unit formed of the nip forming member and the regulation member and configured to regulate the regulation member from being disengaged from the nip forming member.
Abstract: Infrared air float bar for use in floating and drying a continuous planar web of a material in a dryer. Direct radiated or reflected infrared electromagnetic energy from an infrared light source in a removable channel assembly accelerates drying, or evaporation of solvents, or curing of web material passing in proximity to the bar, either by infrared electromagnetic energy, or in combination with convention airflow. The infrared source is cooled by pressurized air passing through an interior portion of the removable air bar channel assembly, and the air is further conducted into fluid contact with the web in an air gap between the emitter and web to promote convective heat transfer and to contribute to the air pressure field supporting web flotation. The removable channel assembly is configured for replacement of the infrared emitter and to allow the setting of the pressurized cooling air flow to the optimum level.
Abstract: The present invention provides a self-heating fuser roller including a tubular resistor layer that generates heat by being supplied with electricity, in which the resistor layer has a plurality of slits. The slits are preferably disposed at regular intervals in a circumferential direction. The slits preferably extend in an axial direction. Preferably, the slits are not provided on both end edges in an axial direction. The slits preferably have an average width of 50 ?m or more and 2 mm or less. The slits preferably have an average interval of 30 ?m or more and 1 mm or less. The slits are preferably filled with a resin composition. The resistor layer preferably includes a resin matrix and a plurality of electrically conductive particles contained in the resin matrix.
July 25, 2016
Date of Patent:
July 30, 2019
SUMITOMO ELECTRIC INDUSTRIES, INC., SUMITOMO ELECTRIC FINE POLYMER, INC.
Abstract: A temperature estimating device configured to estimate a temperature of an electric motor includes a temperature detecting part for acquiring a detected temperature detected by a temperature sensor attached to the electric motor, a memory part for successively storing the detected temperature acquired by the temperature detecting part at a predetermined sampling period, and a temperature estimating part for using the detected temperature stored by the memory part, a ratio of amount of change of the detected temperature with respect to time, and a coefficient as the basis to estimate a temperature of a measurement target part of the electric motor.
Abstract: A thermal printer comprises: a thermal line head configured to include a plurality of resistors and prints an image based on a received print data on thermosensitive paper, the plurality of resistors being divided into unit of being able to be energized concurrently; and a head element inspection unit configured to perform inspection, with the plurality of resistors divided into the unit, to acquire a resistance value of each resistor belonging to the unit on a unit-by-unit basis; wherein, when the image is not being printed, the head element inspection unit inspects the resistors in the unit of division each; wherein the inspection of the resistors is suspended on the unit-by-unit basis, the suspension being based on the print data; and wherein, after completion of the printing of the image, the suspended inspection is resumed on the unit-by-unit basis from where suspended.
Abstract: The present disclosure provides a toner cartridge. The toner cartridge can be removably mounted in an electronic imaging device via a rotatable toner cartridge guide rail configured in the electronic imaging device. The toner cartridge includes a locating column, disposed and movable at one side of the toner cartridge. The locating column is supported by the toner cartridge guide rail and rotates the toner cartridge guide rail when the locating column is moved by an external force. The toner cartridge also includes an inspection device, having a trigger switch and disposed in the electronic imaging device. When the toner cartridge guide rail is rotated in response to the external force on the locating column, the toner cartridge guide rail touches the trigger switch and turns on the trigger switch.
Abstract: A fixing device includes a rotatable cylindrical film, an elongated plate-like heater, a heat conducting member, and a supporting member, wherein the heat conducting member includes an extension portion which extends along a direction opposite to a rotation direction of the film from a portion extending in a direction along a thickness surface of the heater perpendicular to the first surface outside an end portion at one side of the heater in the rotation direction of the film and which contacts the inner surface of the film, wherein the supporting member includes a facing portion which faces the extension portion in a thickness direction of the heater, and wherein a void space is provided between the extension portion of the heat conducting member and the facing portion of the supporting member.
Abstract: A fixing device includes a fixing member, a pressing member, a pressure adjustment part and a linkage part. The pressing member forms a pressing area with the fixing member. The pressure adjustment part moves one of the fixing member and the pressing member in a direction close to the other of the fixing member and the pressing member to increase a pressure of the pressing area and moves one of the fixing member and the pressing member in a direction away from the other of the fixing member and the pressing member to decrease the pressure of the pressing area. The linkage part transmits an operation to decrease the pressure of the pressing area to the fixing member and then moves the fixing member along an axial direction.
Abstract: An image forming apparatus includes a fixing unit having a heater, an energization control unit configured to control energization to a first heat generation member of the heater depending on a temperature detected by a temperature detection element of the fixing unit, a resistance detecting unit configured to detect a resistance of a second heat generation member of the heater, and a temperature acquiring unit configured to acquire a temperature of the heater in the region in which the second heat generation member is formed based on the resistance detected by the resistance detecting unit. An image, formed on a recording material, is fixed to the recording material with heat form the heater.
Abstract: An image heating apparatus includes a cylindrical film, and a heater having a substrate, and a heat generating element provided on the substrate. The heater has an elongated plate-like shape, and a first surface contacting the film, a second surface opposite to the first surface, and a heater lateral surface facing outwardly in a widthwise direction of the heat generating element. A supporting member supports the heater, and includes a recess and a supporting lateral surface that is parallel to and opposes the heater lateral surface. The supporting lateral surface is provided in the recess, and is bonded to the heater lateral surface using an adhesive material. A high heat conduction member has a thermal conductivity greater than a thermal conductivity of the substrate, and contacts the second surface of the heater and is sandwiched between the heater and the supporting member.
Abstract: In an example embodiment, a heater assembly for an aerosol-generating system includes two glass substrates. Each of the glass substrates includes perforations. The heater assembly also includes a heater element, and the heater element is located between the two glass substrates. In another example embodiment, a method for manufacturing a heater assembly includes providing two perforated glass substrates.
Abstract: A fixing device includes an endless belt and a pressure rotator disposed opposite an outer circumferential surface of the endless belt. The pressure rotator has a first span in an axial direction of the endless belt. A nip formation pad, which is disposed opposite an inner circumferential surface of the endless belt, forms a fixing nip between the endless belt and the pressure rotator. The nip formation pad includes a belt-side face disposed opposite the endless belt. A radiant heater, which is disposed opposite the inner circumferential surface of the endless belt, heats the endless belt. A thermal conduction aid, which contacts the belt-side face of the nip formation pad, conducts heat in the axial direction of the endless belt. The thermal conduction aid has a second span within which the first span of the pressure rotator is provided at the fixing nip.
Abstract: A fixing device includes a heating roller to be heated by a heat source, a pair of rollers composed of an upper-side pressure roller and a lower-side pressure roller both for pressing a sheet, and a fixing belt wound around the heating roller and the upper-side pressure roller, in which, in a space surrounded by the fixing belt, a shield for shielding heat from the upper-side pressure roller is disposed to face the upper-side pressure roller.
Abstract: An image forming apparatus includes a fixing unit including a heating member and a pressure member forming a nip portion with the heating member, an air blowing unit including a fan, an opening portion, and an adjustment member for adjusting an opening width of the opening portion, a control unit controlling the fan, and a temperature detection member detecting a temperature of an area, serving as a non-sheet passing area in a recording material having a predetermined size, in a non-air blowing area in the heating member closer to the center of the heating member than the opening portion in a width direction of the recording material, and the recording material having a width by which a part of the non-air blowing area is overlapped with the non-sheet passing area, and the control unit controls the fan according to a temperature detected by the temperature detection member.
Abstract: An image heating apparatus includes a first rotatable member, a second rotatable member cooperative with the first rotatable member to form a heating nip, a first supporting plate supporting the second rotatable member, a second supporting plate rotatably supporting the second rotatable member, a heater unit including the second rotatable member, a heater configured to heat the second rotatable member, a connector mounted to the heater by movement relative to the heater in a first direction, a stopper portion configured to stop the relative movement of the connector relative to the heater in the first direction, and a blocking portion fixed on the first supporting plate. The blocking portion permits mounting of the heater unit with the connector being in the first position relative to the heater. The blocking portion prevents mounting of the heater unit with the connector being in the second position.
Abstract: A power control apparatus that supplies an AC current to a load and adjusts a current amount by setting a portion of a phase range among each of half-wave periods of the AC current to be supplied as a conduction angle and setting the remainder as a non-conduction angle, includes: a reference value determiner that defines a period across a plurality of half-wave periods as a current determination period and that determines a reference value of the conduction angle; and a distribution processor that determines a distribution value to distribute the conduction angle and performs current amount adjustment by distributed conduction angles, wherein the distribution processor determines the distribution value within one current determination period such that the value includes a positive distribution value and a negative distribution value, and an average value of the distributed conduction angles is within ±2.5% with respect to the reference value.
Abstract: A fixing device includes a heating unit that rotates and that fixes a toner image on a recording medium, a pressing unit that rotates and that presses the heating unit, and a potential-difference application unit that applies a potential difference between the pressing unit and the heating unit so that a potential of the heating unit is higher than a potential of the pressing unit.
September 7, 2017
Date of Patent:
March 26, 2019
FUJI XEROX CO., LTD.
Sou Morizaki, Yasutaka Gotoh, Jouta Kobayashi, Kazuaki Iikura, Kazuyoshi Itoh, Yasushi Nagata, Takaaki Sato
Abstract: A fixing device includes a fixing member, a pressing member, a heat source, a detecting part and a control part. The pressing member forms a pressing area with the fixing member. A sheet is conveyed through the pressing area. The heat source includes a main heating part heating a center portion of the fixing member in a sheet width direction perpendicular to a conveying direction of the sheet and a sub heating part heating both end portions of the fixing member in the sheet width direction. The detecting part detects a temperature of the end portion of the fixing member. The control part determines operation timings of the main heating part and the sub heating part based on the temperature detected by the detecting part such that the center portion and the both end portions of the fixing member are heated to a constant temperature.
Abstract: A heater includes an insulating substrate, a heat generating section formed in the insulating substrate and including a plurality of divided regions in a longitudinal direction, temperature sensors detecting temperature of the heat generating section and a wiring pattern for power feed to the temperature sensors, each formed in a layer different from a layer in which the heat generating section is formed in the insulating substrate. The heat generating section, the temperature sensors, and the wiring pattern are layer stacked.
Abstract: A fixing device includes a fixing rotator, an opposed rotator disposed opposite the fixing rotator, a pressure pad, a lateral end heater, and a thermal conduction aid. The pressure pad presses against the opposed rotator via the fixing rotator to form a fixing nip between the fixing rotator and the opposed rotator. The lateral end heater is disposed on the pressure pad to heat a lateral end of the fixing rotator in the axial direction of the fixing rotator. The thermal conduction aid is interposed between the pressure pad and the fixing rotator to decrease a temperature gradient of the fixing rotator in an axial direction of the fixing rotator. The pressure pad includes a nip-side face disposed opposite the thermal conduction aid. The lateral end heater includes a nip-side face being disposed opposite the thermal conduction aid and projecting beyond the nip-side face of the pressure pad.
Abstract: In accordance with an embodiment, a fixing apparatus comprises a belt which is equipped with a conductive layer; an induction current generator which faces the belt and heats the conductive layer through an electromagnetic induction system; a magnetic material which faces the induction current generator across the belt; a measurement section which measures a state of the magnetic material; and a controller which controls a frequency applied to the induction current generator based on a measurement result of the measurement section in a case in which at least a print request is not received.
Abstract: An image forming apparatus comprises a transfer section, a fixing section, and a controller. The transfer section includes a transfer rotating body for conveying a sheet at a first linear velocity, and transfers a toner image onto the sheet. The fixing section forms a nip sandwiching the sheet with a first rotating body and a second rotating body, and a heating section for heating the sheet onto which the toner image is transferred. The controller executes a sheet acceleration and deceleration control for setting a linear velocity of the first rotating body to a second linear velocity from the first linear velocity before the tip of the sheet reaches the nip, and decelerating the linear velocity of the first rotating body from the second linear velocity to the first linear velocity at the time the tip of the sheet reaches a predetermined range in a sheet conveyance path.