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.

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: 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: 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 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: 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: 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.

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.

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.

Abstract: In a fixing device, a heating section is disposed opposite to an inner circumferential surface of a fixing belt, and includes a heater, a heater holding member, a reinforcing member extending in a rotation axis of the pressure member, a heat sensitive body disposed on the heater holding member, and an urging member disposed between the reinforcing member and the heat sensitive body. The heater holding member includes an engaging portion engaging with a first end of the reinforcing member. In a state in which the reinforcing member is located opposite to the heater holding member through the reinforcing member turning about the engaging portion as a pivot, the urging member urges the heat sensitive body against the heater and a distance between the heat sensitive body and a second end of the reinforcing member is shorter than a distance between the heat sensitive body and the first end.

Abstract: When an image forming portion continuously forms a toner image on a plurality of recording materials, an acquiring portion, which acquires information on the toner on the recording materials from the image information, acquires a coverage ratio, which is a ratio of an image portion, that is, a toner laid-on portion in a predetermined region of the recording material, with respect to the predetermined region, for a plurality of recording materials, and an power control portion controls the power supplied to a heating element of a heater in a fixing portion for each of the plurality of recording materials based on a control target temperature, which is determined by correcting a reference target temperature in the predetermined region by a correction amount reflecting the history of the coverage ratio in the plurality of recording materials.

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.

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.

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 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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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 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.

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.

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.

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.

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.

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.

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.

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: 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.

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.

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.

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.

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.

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.

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.

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.

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.