Abstract: An image forming apparatus includes a plurality of temperature-influence members, a first-point temperature acquisition unit, a second-point temperature estimation unit, and a controller. The plurality of temperature-influence members have influence on a temperature of a recording medium on which an image is formed. The first-point temperature acquisition unit is configured to detect or estimate a temperature of the recording medium at a first point. The second-point temperature estimation unit is configured to estimate a temperature of the recording medium at a second point, based on a detection result of at least one of a temperature of the recording medium at a point different from the second point and a temperature of a member or atmosphere. The controller is configured to control the plurality of temperature-influence members, based on an acquisition result from the first-point temperature acquisition unit and an estimation result from the second-point temperature estimation unit.
September 24, 2020
Date of Patent:
November 23, 2021
RICOH COMPANY, LTD., TOKYO INSTITUTE OF TECHNOLOGY
Abstract: An image forming apparatus includes: an acquiring portion configured to acquire image information and operation information of the image forming apparatus; an image forming portion configured to form a toner image on a recording material; a fixing portion configured to fix the toner image to the recording material by heating the recording material on which the toner image is formed; and a control portion configured to, when the acquiring portion acquires image information corresponding to a first page and fails to acquire image information corresponding to a second page following the first page, set a temperature of the fixing portion for fixing the first page as a first temperature based on the image information corresponding to the first page and the operation information, and set the temperature of the fixing portion for fixing the second page as a second temperature based on the operation information.
Abstract: The image forming apparatus includes a fixing device that has a heater, and a required power calculation unit that determines a power Pfsr that is assumed to be required by the heater. Based on a difference between a required power that is determined by the required power calculation unit and a suppliable power, the image forming apparatus selects whether to start printing in a normal mode or to start printing in a power saving mode in which the power that is supplied to the heater is reduced in comparison to the normal mode. The power saving mode includes a plurality of modes, and when a CPU selects the power saving mode, the CPU selects one or a combination of modes from among the plurality of power saving modes based on the aforementioned difference.
Abstract: A fixing unit includes a film with a tubular shape, a nip forming unit including a heater and configured to be in sliding contact with an inner surface of the film, the heater including a substrate made of metal, an insulating layer formed on the substrate, and a heating element arranged on the insulating layer and configured to generate heat when a first AC voltage is applied from an AC power supply connected thereto, a pressing member opposed to the nip forming unit with the film interposed therebetween and configured to form a nip portion with the film, and a voltage application circuit configured to apply a second AC voltage to the substrate with a waveform that takes a voltage value of an opposite polarity to the first AC voltage when the first AC voltage takes a peak value.
Abstract: An image forming apparatus according to one or more embodiments includes a fixing device and a controller. The fixing device includes a first heating source and a second heating source. The second heating source has a heating width greater than that of the first heating source. The first and second heating sources have different heating characteristics in response to temperature increases. The controller selects one of the first heating source and the second heating source according to a size of a sheet on which printing is to be performed.
Abstract: A belt device includes an endless belt, a plurality of support rotators configured to support the endless belt, and a support configured to support shaft portions of the plurality of support rotators. The support has an attaching and detaching path through which the shaft portions of the plurality of support rotators pass in a direction orthogonal to an axial direction of at least one of the plurality of support rotators when the shaft portions of the plurality of support rotators are detached from the support.
Abstract: An image heating apparatus including first and second rotatable members, first and second cooling fans, an air blowing port, a shutter member, a shutter controller, and a fan controller. The first cooling fan is provided at a position opposing a first region which is a part of an end portion region of the first rotatable member on one end side. The second cooling fan is provided at a position opposing a second region which is part of the end portion region. The second region is adjacent to the first region with respect to the longitudinal direction. The shutter controller is configured to control a position of the shutter member depending on a width size of a recording material. The fan controller is configured to independently control an operation of the first cooling fan and an operation of the second cooling fan depending on the width size of the recording material.
Abstract: An energization control device includes a voltage detection unit, a control portion, and an energization switching unit. The control portion to which the first detection signal and the second detection signal are input from the voltage detection unit is configured to output a first energization signal if the first detection signal is input and output a second energization signal if the second detection signal is input. The control portion is configured to obtain a correction value based on a difference between a first period in which the first detection signal is input to the control portion and a second period in which the second detection signal is input to the control portion and to correct a timing of switching between the first energization signal and the second energization signal with the correction value.
Abstract: The heater including a substrate, a first heat generation member, a second heat generation member having a length substantially a same in a longitudinal direction as a length of the first heat generation member, a third heat generation member having a length shorter than lengths of the first heat generation member and the second heat generation member in the longitudinal direction, and a fourth heat generation member having a length shorter than length of the third heat generation member in the longitudinal direction, wherein the first heat generation member, the second heat generation member, the third heat generation member and the fourth heat generation member are arranged on the substrate.
Abstract: An apparatus includes a control portion. When a toner image formed on a first recording material is fixed onto the first recording material by the fixing portion, and then an image is formed on a second recording material of which width is larger than that of the first recording material, the control portion can execute a cooling sequence to cool a non-passing region of the fixing portion through which the second recording material passes but the first recording material does not pass, before the toner image formed on the second recording material is fixed by the fixing portion. The control portion sets an execution condition to execute the cooling sequence in accordance with information on the toner image in the region of the second recording material corresponding to the non-passing region.
Abstract: A fusing apparatus includes a substrate having a first surface and a second surface, the second surface being opposite the first surface on the substrate, a first resistive trace and a second resistive trace, the first and second resistive traces being disposed adjacent each other along the first surface of the substrate in a length-wise direction thereof. A resistance of the first resistive trace is less than a resistance of the second resistive trace.
February 28, 2019
Date of Patent:
July 20, 2021
LEXMARK INTERNATIONAL, INC.
Jichang Cao, Alexander Johannes Geyling, Russell Edward Lucas
Abstract: A heating device includes a base, a plurality of resistance heating elements, a power control circuit, a first temperature sensor, a second temperature sensor, and control circuitry. The resistance heating elements is disposed in a longitudinal direction of the base and electrically connected in parallel with each other. The power control circuit is configured to supply electrical power to the resistance heating elements. The control circuitry is configured to control an electrical power amount of the power control circuit so that temperatures of the resistance heating elements become equal to a first predetermined temperature based on a result of sensing with a first temperature sensor of the resistance heating elements and cut off the electrical power supplied from the power control circuit to the resistance heating elements in response to sensing of a second predetermined temperature with a second temperature sensor of the resistance heating elements.
Abstract: An image forming apparatus that forms an image on a recording material has a second image forming mode that (i) controls the target control temperature of a heater to be lower than in a normal image forming mode and at least (ii) extends a period of time from the start of image forming to a point of time at which the recording material reaches the nip portion to be longer than in the normal image forming mode based on (A) recording material information indicating the hardness of the recording material, at least one of (B) margin information indicating the size of the margin at the leading end in the transport direction of the recording material and (C) toner amount information at the leading end of the image formed on the recording material, and (D) information of an environment in which the image forming apparatus is installed.
Abstract: A heating apparatus includes a cylindrical film, a plurality of heating elements arranged inside the cylindrical film along a longitudinal direction thereof, a plurality of thermometers each configured to measure temperature of one of the heating elements, a power supply, a controller configured to control the power supply to supply electrical power to the heating elements according to the temperature measured by the thermometers, and a plurality of thermostats each configured to measure temperature of one of the heating elements and configured to interrupt the electrical power supplied to the heating element when the measured temperature exceeds a predetermined value. The thermometers and the thermostats are alternately arranged along the longitudinal direction.
Abstract: A fixing device includes a heating member, a detector, a holding member, and a biasing member. The heating member is configured to transport a recording medium while nipping the recording medium with a pressure member, so as to fix a toner image onto the recording medium. The detector is configured to measure a temperature of the heating member. The holding member holds the detector. The biasing member biases the holding member so as to bring the detector into contact with a surface of the heating member.
Abstract: An image forming apparatus includes an image forming device, a heater, and a controller. The image forming device is configured to generate a laser scanning beam based on the image data to form a toner image on a sheet. The heater is configured to heat the sheet. The heater includes heater elements arranged in a direction corresponding to the main scanning direction of the laser scanning. The controller is configured to selectively control the heater elements to be energized at an energization start timing based on the image data and a signal from the image forming device indicating a start of scanning by the laser scanning beam in the main scanning direction.
Abstract: In a fixing apparatus 200 having a heater 300 capable of selectively causing a plurality of heat generating blocks divided in a longitudinal direction of a substrate 305 to generate heat, an energization control portion 400 acquires, when performing a fixing operation, a cumulative amount of heat generation in each of a plurality of heating areas, a cumulative rotation time of a pressure roller 208, and information on a recording material that passes through a fixing nip portion, and controls energization of heat generating elements 302a and 302b on the basis of the acquired information.
Abstract: An image forming apparatus has a heating roller and a pressing roller, a nip being formed therebetween, and a controller configured to perform a heating controlling process of raising the temperature of the heating roller toward a fixing temperature, a rotational controlling process of rotating the heating roller and the pressing roller when a detected temperature of the heating roller is equal to or higher than a first threshold temperature, and a conveyance controlling process of conveying the sheet toward the developing device when the detected temperature is equal to or higher than a second temperature higher than the first temperature and lower than the fixing temperature. The controller is configured to set the first temperature to be lower in a case where a nip width is the second width than in a case where the nip width is the first width.
Abstract: A fixing unit includes a rotary member, a magnetic core, a coil, a converter device, a temperature detection unit, and a controller. A conductive layer of the rotary member is heated by induction heating. The controller causes the converter device to output a cyclic waveform in which a first waveform and a second waveform appear. The first waveform is a waveform in which pulses having a constant cycle are successively output for a first output period and output of the pulses is paused for a first pause period after the first output period. The second waveform is a waveform in which the first waveform is repeatedly output for a second output period and output of the first waveform is paused for a second pause period after the second output period. The cyclic waveform is a waveform in which the second waveform is cyclically repeated as a repetition unit.
Abstract: In a case where an analysis result of image data of an (N+1)th page has not been acquired among image data, a fixing temperature for printing image data of an N-th page is determined at least based on a result of determination as to whether the image data of the N-th page and the image data of the (N+1)th page are similar and an analysis result of the image data of the N-th page.
Abstract: The fixing apparatus includes a heater including at least two heat generation members, a relay, a triac, a zero-crossing circuit unit connected between a first pole and a second pole of an AC power supply, and configured to output a zero-crossing signal, and a CPU configured to control the relay and the triac, and the CPU determines which one of the at least two heat generation members is the heat generation member to which electric power is being supplied from the AC power supply, based on the zero-crossing signal output from the zero-crossing circuit unit.
Abstract: A controller controls power to be supplied to a plurality of heat-generating blocks obtained by dividing a heater in a direction orthogonal to a transport direction for a recording material, and when images formed on a plurality of sheets of the recording material having an equal size are continuously heated, and the controller determines whether each of the heat-generating blocks is a heat-generating block which is passed by the recording material or a heat-generating block which is not passed by the recording material on the basis of a detection temperature by a temperature detecting element when prescribed power is supplied to the heat-generating block and changes a control condition in heating on the basis of the determination.
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.
Abstract: An image fixing device includes a rotatable fixing belt, a pressing roller, a nip forming member, a heating roller, a cooling fan, a temperature sensor, and a controller. The nip forming member contacts an inner surface of the fixing belt to sandwich the fixing belt between the pressing roller to form a nip. The heating roller stretches the fixing belt. The cooling fan cools the fixing belt and is opposite to the belt at a position downstream of the heating roller and upstream of the nip forming member in the rotational movement direction of the fixing belt. The temperature sensor detects a temperature of the fixing belt and is provided at a position downstream of the cooling fan and upstream of the nip. The controller controls the power supplied to the heater on the basis of an output of the temperature sensor.
Abstract: A fixing device includes at least one temperature detector and a device-side connector. The at least one temperature detector is configured to detect a temperature of the fixing device. The device-side connector is configured to transmit a temperature detection signal from the at least one temperature detector to an image forming apparatus body by mutual contact between a terminal of the device-side connector and a terminal of a body-side connector of the image forming apparatus body. A lead wire of the at least one temperature detector is branched into a plurality of wires connected to the device-side connector.
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.
April 14, 2020
Date of Patent:
March 16, 2021
Canon Kabushiki Kaisha
Kohei Okayasu, Masashi Tanaka, Shingo Ito
Abstract: In an image forming apparatus including an image heating portion that heats an image formed on a recording material using heat of a heater constituted of a substrate and a plurality of heat generating resistors disposed on the substrate, the plurality of heat generating resistors include (i) a first heat generating resistor that has a first temperature coefficient of resistance, and (ii) a second heat generating resistor that has a second temperature coefficient of resistance which is smaller than the first temperature coefficient of resistance, and heats a second heating region of which width in the longitudinal direction of the substrate is narrower than the first heating region which is heated by the first heat generating resistor, among the plurality of heating regions heated by the plurality of heat generating resistors.
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.
Abstract: A nip former includes a base, an enhanced thermal conductor including an insertion hole, and a securing member including an inserting portion to be inserted into the insertion hole to attach the securing member to the enhanced thermal conductor such that the enhanced thermal conductor and the securing member sandwich the base. The inserting portion has a width that is smaller than a width of the insertion hole in a pressurization direction of an opposed rotator that presses against the nip former via a belt. The inserting portion does not contact an upstream wall and a downstream wall of the insertion hole in the pressurization direction of the opposed rotator and a direction opposite the pressurization direction of the opposed rotator in a state in which the securing member is secured to the base and the opposed rotator presses against the enhanced thermal conductor via the belt.
Abstract: An image forming apparatus includes a control portion configured to output, in a test mode, a recording member which has passed through a fixing nip portion in a case of a first temperature difference in which a center part temperature of a first rotary member is higher than an end part temperature of the first rotary member and a recording member which has passed through the fixing nip portion in a case of a second temperature difference in which the center part temperature is lower than the end part temperature by one operation of starting test mode to the input portion.
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.
Abstract: The invention relates to a method for managing a main module (1) of a production line, with said main module (1) being equipped with thermal means that operate in production at a setpoint temperature (1000), method in which during production, when there is a break in production continuity at said main module (1), the temperature of said thermal means is lowered, and then their temperature is reset until said setpoint temperature (1000) is reached. Advantageously, at least data from a past event comprising at least one temperature rise time of said thermal means from a first temperature to a second temperature is recorded, and based on said data, the temperature of said thermal means is adapted automatically to reach said setpoint temperature (1000), at the latest when the production continuity resumes at said main module (1). The object of the invention is also a corresponding management device.
Abstract: In a first operation mode in which a first addition value for each sheet of a recording material and a first initial control temperature, when the total sum of the first addition values exceeds a predetermined threshold value, a control portion of an image heating portion, which heats an image on the recording material, of an image forming apparatus changes the first initial control temperature to a first correction control temperature. When the operation mode is changed from the first operation mode to a second operation mode in which a second addition value different from the first addition value and a second initial control temperature different from the first initial control temperature, the control portion corrects the first correction control temperature based on a difference between initial control target temperatures.
Abstract: An image heating apparatus includes a heater having a plurality of heating elements arranged in a direction orthogonal to a conveying direction of a recording material, each of the plurality of heating elements having a heating region, and a control portion that controls electrical power to be supplied to the plurality of heating elements, the control portion being capable of individually controlling the plurality of heating elements. The control portion executes control of a heat generating quantity of each of the plurality of heating elements such that a heat generating quantity when heating a first region of the recording material including an image, a heat generating quantity when heating a second region of the recording material not including an image, and a heat generating quantity when heating a third region, in which there is no recording material, are different from each other.
Abstract: An image forming apparatus includes a fixing device that fixes a developer image to a sheet and includes a first heating element and a second heating element, and a control unit. The first heating element generates heat that is provided to a first print region of the sheet. The second heating element generates heat that is provided to a second print region of the sheet. The second heating element is arranged adjacent the first heating element in a main scanning direction such that a first boundary is defined between the heating elements. The control unit controls heat generation of the first heating element based on a presence or absence of heat generation of the second heating element and a maximum distance in the main scanning direction from the first boundary to an end portion of an image region containing at least a portion of the developer image.
Abstract: An image forming apparatus includes a fixing unit including a heater including a heating element, a fixing belt having a surface to which a lubricant is applied and contacting the heater through the lubricant, and a pressing roller capable of pressing and rotating the fixing belt, a power supply configured to supply electric power to the heating element, a first thermometer configured to measure temperature of the heating element, and a controller configured to determine a first amount of electric power to be supplied to the heating element based on the temperature of the heating element, and control the power supply to supply the determined first amount of electric power to the heating element, before controlling the pressing roller to start rotation.
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.
November 5, 2019
Date of Patent:
January 5, 2021
Canon Kabushiki Kaisha
Kohei Wakatsu, Kazuhiro Doda, Tsuguhiro Yoshida, Yutaka Sato, Ken Oi
Abstract: An image heating apparatus includes an electroconductive cylindrical member, an opposing member thereto, a nip forming member cooperating with the opposing member to form a nip configured to nip and feed a recording material, a magnetic field generating device, a converter, a temperature detector for the rotatable member, and a converter controller. The magnetic field generating device includes an excitation coil in an inside space of the rotatable member so that a helicity axis of the excitation coil is in parallel with an axial direction of the rotatable member to produce an induced current in a circumferential direction of the rotatable member. The converter applies a high frequency voltage to the coil. The controller controls the temperature of the rotatable member by controlling at least one of a pulse period, a pulse-on time, a burst period, and a burst-on time.
Abstract: An information processing device includes circuitry. The circuitry is configured to control a temperature of a heater. The heater performs heating in a printing process. The circuitry is further configured to measure an elapsed time from satisfaction of a given condition, and to determine whether the elapsed time is equal to or longer than a given time. The circuitry is configured to cause the temperature of the heater to rise based on a determination that the elapsed time is equal to or longer than the given time.
Abstract: A temperature detector for being positioned with respect to a counterpart includes a temperature detecting element that detects a temperature of a detecting target and a holding body that holds the temperature detecting element. A projecting engagement engages the counterpart and is mounted on the holding body.
October 18, 2019
Date of Patent:
November 24, 2020
Ricoh Company, Ltd.
Yuusuke Furuichi, Hiroshi Seo, Yoshiki Yamaguchi
Abstract: Provided is an image forming apparatus, having: a fixing portion which includes a plurality of heating elements and heats a plurality of heating regions independently using the plurality of heating elements respectively so as to fix an image formed on a recording material to the recording material; an acquiring portion which acquires information on an image formed on a recording material, and thermal history information on a plurality of regions corresponding to the plurality of heating regions in the fixing portion respectively; and a control portion which controls heating of the heating regions by the fixing portion. The control portion corrects a control setting used for the temperature control of the heating regions, based on the thermal history information on a region of the fixing portion corresponding to a thermal history calculating region generated by dividing each of the heating regions in a direction orthogonal to the transport direction.
Abstract: An image forming apparatus and a control method of an image forming apparatus which offers high convenience are described. An image forming section forms a toner image in a print medium, and fixes the toner image by a heated fixing device. A power circuit supplies power to the image forming section to heat the fixing device. A communication interface receives a facsimile call signal and a facsimile image signal. A system controller controls the image forming section and the power circuit such that, when the facsimile call signal and the facsimile image signal are received, the image forming section and the power circuit are controlled to form an image by the image forming section on the basis of the facsimile image signal and, when the facsimile call signal is received and the facsimile image signal is not received, the power circuit supplies power to the image forming section to heat the fixing device.
Abstract: According to an embodiment, a fixing device includes rotating body that is rotatably supported, a heater that heats the rotating body, a pressing body that is pressed against the rotating body to form a nip through which print media passes to a media conveyance path, and a water vapor discharge passage downstream of the nip from rotating body. The water vapor discharge passage is separate and distinct from the media conveyance path. The fixing device may be used in image forming apparatuses and the like.
Abstract: A printing apparatus includes a print head, a processor, and a drying mechanism. The print head ejects ink onto a printing medium located in a printing region to form an image. The processor is configured to control a duty that is an amount of ink ejected by the print head onto the printing medium per unit area. The drying mechanism includes a transport unit that transports the printing medium in a first direction and a heater that heats the printing medium. The drying mechanism is configured to dry the printing medium having the image formed thereon by the print head, by transporting, using the transport unit, the printing medium to a drying region in which the printing medium is dried by the heater. The processor controls drying of the printing medium performed by the drying mechanism in accordance with the duty.
Abstract: A fixing device includes a fixing member, at least one temperature detector, and a device-side drawer connector. The at least one temperature detector is configured to detect a temperature of the fixing member, the at least one temperature detector including a plurality of lead wires. The device-side drawer connector has a terminal portion configured to fit with a terminal portion of a body-side drawer connector of an image forming apparatus body to connect the plurality of lead wires of the at least one temperature detector to the image forming apparatus body. The device-side drawer connector is configured to branch a signal wire of the plurality of lead wires of the at least one temperature detector into a plurality of systems. A plurality of earth wires of the plurality of lead wires of the at least one temperature detector is short-circuited to each other.
Abstract: A driving-force transmission member includes a coupling portion that includes a driving-force transmission surface and that transmits a driving force to a cartridge coupling, a first helical gear portion that engages with a driven gear of a cartridge to transmit the driving force, and a second helical gear portion that engages with a drive gear to receive the driving force. The portions rotate integrally with each other when the driving-force transmission member rotates about the axis of rotation. The driving-force transmission surface is shaped with a twist in the same direction as the driving-force transmission member. Helical teeth of the first helical gear portion are shaped with a twist in the same direction as the driving-force transmission surface. Helical teeth of the second helical gear portion are shaped with a twist in a direction opposite to the twist direction of the helical teeth of the first helical gear portion.
Abstract: An apparatus decides a supply rate for each control period that comprises a plurality of half periods in an alternating current based on a difference between a target temperature and a temperature detected by a detector. In a case where the same supply rate over a plurality of the control period is decided, a start phase angle that is a reference for a supply start corresponding to the supply rate is decided so that the start phase angle is located outside a prohibited section and a combination of the start phase angle differs for each control period. For each of a plurality of half periods configuring the control period, supply of the alternating current to a heater is started at the start phase angle. When a zero cross point of the alternating current arrives, the supply of the alternating current is stopped.
Abstract: Controlling power delivered to a heating device occurs using a phase control, wherein the phase control includes changing a cut-off phase of an alternating current electrical signal delivered to the heating device. The power delivered to the heating device is increased from zero to an operational level using the phase control. The level of the power delivered to the heating device is maintained at the operational level using both the phase control and an integral half cycle control. The integral half cycle includes selectively removing a plurality of half cycles from the alternating current electrical signal delivered to the heating device.
March 31, 2017
Date of Patent:
September 15, 2020
Hewlett-Packard Development Company, L.P.
Abstract: An image forming apparatus comprises a first temperature detector to detect a temperature of a first portion of an optical scanning device in a printer. The first portion is proximate to a heat generating element in the optical scanning device. A second temperature detector is provided to detect a temperature of a second portion of the optical scanning device, which is farther from the heat generating element than the first portion. A controller is configured to perform alignment control for correcting a color positional shift of the printer when either a detected temperature change of the first portion is greater than or equal to a first threshold value or a detected temperature change of the second portion is greater than or equal to a second threshold value.
March 26, 2019
Date of Patent:
September 8, 2020
TOSHIBA TEC KABUSHIKI KAISHA
Takahiro Kojima, Jun Ishii, Shunsuke Ando, Motoshi Ueda
Abstract: An image forming apparatus for forming a toner image on a recording material. The image forming apparatus includes an image forming portion configured to form the toner image on the recording material, a fixing portion including a heater and configured to fix the toner image on the recording material by heating the toner image formed on the recording material, and a controller configured to control the image forming apparatus. When toner images are continuously formed on a plurality of recording materials, the controller sets an interval between a preceding recording material and a subsequent recording material depending on unevenness of a print ratio of the subsequent recording material with respect to a direction perpendicular to a recording material feeding direction of the subsequent recording material.