| Class / Patent application number | Description | Number of patent applications / Date published |
|---|
| 399033000 | Fixing (e.g., over-temperature protection) | 77 |
| 20090214234 | FIXING DEVICE, IMAGE FORMING APPARATUS, AND METHOD OF DETECTING AN ABNORMALITY OF A FIXING DEVICE - A fixing device according to this invention includes a heating roller, a heater driver, a thermistor, and a CPU. The heating roller has a heater and heats a recording sheet. The heater driver drives the heater. The thermistor detects a surface temperature of the heating roller. The CPU stops an operation of the heater driver when the surface temperature of the heating roller becomes higher than a predetermined temperature and, thereafter, causes the thermistor to perform detection of the surface temperature of the heating roller for a predetermined time period and issues an alarm about occurrence of a first abnormality when the surface temperature of the heating roller fails to drop in the predetermined time period. | 08-27-2009 |
| 20100150585 | METHOD AND APPARATUS FOR MEASURING NIP WIDTH IN AN IMAGE PRODUCTION DEVICE - A method and apparatus for measuring nip width in an image production device is disclosed. The method may include receiving a signal to measure the nip width, the nip width being the distance of an arc length created by an intersection of the fuser roll and the pressure roll, positioning a nip width measuring device into the nip, measuring the nip width, determining if the measured nip width meets a required nip width, wherein if the measured nip width does not meet the required nip width, adjusting the nip width. | 06-17-2010 |
| 20120183312 | APPARATUS AND METHOD OF PROTECTING FUSER UNIT AND IMAGE FORMING APPARATUS INCLUDING THE SAME - An apparatus and method of protecting a fuser unit and an image forming apparatus having the same include a fuser drive motor portion to drive the fuser unit, a power detecting portion to detect power that is supplied to the fuser unit, and a power cutoff portion to cut off the power supplied to the fuser unit when a motor rotation signal is not output from the fuse drive motor portion and the power detecting portion detects the power that is supplied to the fuser unit. The fuser unit protecting apparatus and method and the image forming apparatus including the fuser unit protecting apparatus are configured to detect rotation of a fuser drive motor and supply of an alternating current required for a temperature rise and cut off the power supply when abnormal conditions occur, to prevent a continuous rise in a temperature of the fuser unit as well as deformation thereof. | 07-19-2012 |
| 20100104298 | FIXING DEVICE AND IMAGE FORMING APPARATUS - A fixing device includes a heating member that heats an unfixed toner image on a printing medium, a conveyance device that conveys the printing medium launched from the heating member after the heating member heats the unfixed toner image, and a heat temperature detection device that detects heat temperature of the heating member. An excessive temperature rise prevention device is provided to forcibly cut off power distribution to the heating member when the heat temperature reaches an abnormal level. A cooling device is provided to cool the excessive temperature rise prevention device. Further provided is a cooling device use control device that controls the cooling device to cool the excessive temperature rise prevention device when the conveyance device stops a conveyance operation. | 04-29-2010 |
| 20100104297 | IMAGE FORMING APPARATUS AND CONTROL METHOD THEREFOR - An image forming apparatus that enables to continue an operation so that electric power consumption does not exceed a power supply capacity even if an electric current sensor breaks down. A temperature detection unit detects a temperature of a fixing unit that fixes a developed image transferred to sheet material. A failure detection unit detects whether an electric current detection unit that detects an electric current from a commercial power source breaks down. A control unit determines a fixing electric power supplied to the fixing unit based on the temperature detected by the temperature detection unit; and changes the determined fixing electric power so that the electric power consumption does not exceed a limit value and so as not to exceed a predetermined electric power without using an output of the electric current detection unit when the failure detection unit detects a failure of the electric current detection unit. | 04-29-2010 |
| 20130045018 | FIXING DEVICE AND IMAGE FORMING APPARATUS - A fixing device includes a fixing unit and a switching unit. The fixing unit includes an emitting unit that emits light and a housing that houses the emitting unit. The fixing unit fixes a toner image to a recording medium by emitting the light to a surface of the recording medium, the recording medium having the toner image formed thereon and having been transported to a predetermined fixing position that is away from the housing. The switching unit switches a state of the fixing device from a first state in which the housing and the recording medium are positioned away from each other to a second state in which the surface of the recording medium at the fixing position is sealed with the housing. | 02-21-2013 |
| 20100142978 | FIXING DEVICE - A fixing device and an image forming apparatus having the same, and a method of operating the fixing device, the fixing device being provided with a power interruption unit to prevent overheating of the fixing device by physically separating a fuse element from a power line and/or approximating a thermostat to a fixing member of the fixing device. | 06-10-2010 |
| 20130089344 | FUSING DEVICE OF IMAGE FORMING APPARATUS AND METHOD OF DETECTING LEAKAGE CURRENT THEREOF - A fusing device of an image forming apparatus including a fusing element in which a heat generation layer is formed and a pressurization element that forms a fusing nip by pressurizing and contacting the fusing element, the fusing device including: a power supplier for supplying a power supply voltage to the heat generation layer to heat the heat generation layer; a current signal detector for detecting a current signal corresponding to a difference between an input current of the heat generation layer and an output current of the heat generation layer; a determination unit for determining whether current leaks out of the heat generation layer by analyzing the current signal detected by the current signal detector; and a power breaker for preventing the power supply voltage, supplied from the power supplier, from being supplied to the heat generation unit, if the determination unit determines that current leaks out of the heat generation layer. | 04-11-2013 |
| 20090310987 | SYSTEM AND METHOD FOR DETECTING A FIRE IN A FIXER UNIT OF A PRINTER OR COPIER - In a fixer unit system and method to detect a fire in a fixer unit of an electrographic image generation device, at least one portion of a fixer region of the fixing unit is monitored with a photoelectric sensor arranged adjacent to a substrate material having a toner image to be fixed, at least one portion of radiation generated by at least one heat radiator of the fixer unit is not detected by the photoelectric sensor by not passing said at least one portion of the radiation generated by the at least one heat radiator through to the photoelectric sensor by use of an optical filter associated with the photoelectric sensor. An error signal is output when a fire in the fixer region is detected with the photoelectric sensor. | 12-17-2009 |
| 20090304401 | ELECTRONIC DEVICE AND IMAGE FORMING APPARATUS - An electronic device and an image forming apparatus capable of notifying that a voltage drop will occur during operation of the device due to an abnormality of a power source facility before actual operations. A load is configured to operate on electric power supplied from a commercial power source. A detection unit is configured to detect a source voltage input from the commercial power source. A storage unit is configured to store an operation guarantee voltage value that is required for operation of said load. A control unit is configured to control electric power applied to said load. A notification unit configured to perform notification. | 12-10-2009 |
| 20090304400 | Apparatus and method for mounting an RF monitoring device onto a fuser roll - A replaceable unit monitor assembly includes a substrate member, multiple thermal insulating stand-off members, and a monitor device mounted on the substrate member. The stand-off members mount the substrate member to an end hub of a fuser roll of a printing machine while limiting conductive heat transfer to the monitor device. | 12-10-2009 |
| 20120219308 | FIXING DEVICE AND IMAGE FORMING APPARATUS - A fixing device thermally fixes an unfixed image formed on a recording sheet that passes through a nip, the nip being formed by a pressing member pressing against a circumferential surface of a heating rotating body that includes a resistance heating layer. The fixing device includes a power supplier configured to supply power to the resistance heating layer, a driver configured to rotate the heating rotating body, a controller configured to control supply of the power by the power supplier, and an abnormal heat detector configured to detect whether abnormal heat occurs anywhere along an entire surface of a heat-producing region within the heating rotating body, detection being performed during rotation of the heating rotating body. The controller causes the power supplier to stop supplying power to the resistance heating layer when the abnormal heat detector detects abnormal heat. | 08-30-2012 |
| 20130071132 | FUSER PROTECTION DEVICE AND IMAGE FORMING APPARATUS HAVING THE SAME - A fuser protection device realizing a protection circuit to protect a fuser by forcibly turning off a heater lamp when the heater lamp is overheated using a sensing signal from a non-contact thermistor to sense surface temperature of a heating roller and an image forming apparatus having the same. The fuser protection device includes a temperature sensing unit to sense a temperature of the heating roller in a non-contact fashion using two sensors provided at different positions, a differential amplifier to amplify a voltage difference between two sensor outputs from the temperature sensing unit, and a comparator to compare an output voltage from the differential amplifier with a reference voltage, wherein power supply to the heater lamp is blocked according to an output signal from the comparator. | 03-21-2013 |
| 20130094869 | FUSING UNIT OF IMAGE FORMING APPARATUS AND CONTROL METHOD FOR THE SAME - A fusing unit and an image forming apparatus including the same, and method are provided. The fusing unit senses an error such as local overheating in a surface heater, which uniformly emits heat throughout the surface of a belt member. The fusing unit includes a heating member with a pattern to heat a recording medium, a power supply to supply power to the heating member, a pressing member to transmit rotational force to the heating member while in contact with the heating member and to apply pressure to the recording medium, a driver to rotatably drive the pressing member, a pattern sensor to sense the pattern, and a controller to determine whether there is an error in the rotation of the heating member, based on an output from the pattern sensor. | 04-18-2013 |
| 20120224869 | Fixing Device And Image Forming Apparatus Incorporating Same - A fixing device includes a protected object disposed opposite an outer circumferential surface of a pressing rotary body and upstream from a fixing nip formed between the pressing rotary body and a fixing rotary body in a direction of rotation of the pressing rotary body; a stationary duct disposed upstream from the protected object in the direction of rotation of the pressing rotary body, the stationary duct including a blowoff outlet disposed opposite the outer circumferential surface of the pressing rotary body through which airflow impinges on the outer circumferential surface of the pressing rotary body; and a shield interposed between the blowoff outlet of the stationary duct and the protected object in the direction of rotation of the pressing rotary body to protect the protected object against airflow from the blowoff outlet. | 09-06-2012 |
| 20130101302 | IMAGE FORMING APPARATUS - A fixing device thermally fixes an unfixed toner image onto a recording sheet and includes: a rotatable heating element that is endless and includes a resistive heating layer that generates heat upon application of voltage; a power source for placing voltage across the resistive heating layer; an ammeter for measuring the electric current flowing through the resistive heating layer, and a controller for determining whether the resistive heating layer has a scratch by monitoring an amount of change between a value of electric current that flows through the resistive heating in absence of a scratch and a value of electric current actually measured by the ammeter. The resistive heating layer exhibits resistivity anisotropy satisfying R1| 04-25-2013 | |
| 20120237229 | FIXING DEVICE, FIXING DEVICE CONTROL METHOD, AND IMAGE FORMING APPARATUS - A fixing device includes a fuser member, a pressure member, a positioning mechanism, an operational thermometer, an environmental sensor, and a controller. The fuser member is subjected to heating. The pressure member is opposite the fuser member. Thee fuser member and the pressure member press against each other to form a fixing nip therebetween through which a recording medium is passed. The positioning mechanism is coupled with the pressure member to move the pressure member into and away from contact with the fuser member. The operational thermometer adjoins the pressure member to detect an operational temperature at a surface of the pressure member. The environmental sensor is disposed in the image forming apparatus to detect an environmental condition. The controller is connected to the operational thermometer and the environmental sensor to control the positioning mechanism to adjust spacing between the fuser member and the pressure member. | 09-20-2012 |
| 20110280596 | HEATING APPARATUS AND IMAGE FORMING APPARATUS - The heating apparatus includes a first detection part which detects whether or not the power supplied to the heat generation member is in an overpower state by detecting a positive phase of a half wave in an alternating voltage of a commercial power supply applied to the first or the second current path of the heat generation member, a second detection part which detects whether the power supplied to the heat generation member is in an overpower state or not by detecting a negative phase of a half wave in an alternating voltage the commercial power supply applied to the first current path or the second current path of the heat generation member, and a control part which controls itself to stop supplying power from the commercial power supply to the heat generation member in a case where an overpower state is detected by the first or second detection part. | 11-17-2011 |
| 20110293297 | FIXING DEVICE, IMAGE FORMING APPARATUS AND HEAT GENERATING ROTATIONAL BODY - The present invention provides a fixing device that can interrupt power supply to the resistive heat layer more reliably than the conventional technology, for example, at occurrence of abnormality. Electrodes | 12-01-2011 |
| 20110268460 | IMAGE FORMING APPARATUS - An image forming apparatus includes a fixing portion for fixing an image formed on a recording material, the fixing portion including an endless belt, a heater contacted to an inner surface of the endless belt, a pressing member for forming a fixing nip with the heater with the endless belt in the nip; and a switching mechanism for switching a state of the fixing nip between a first state in which pressure at the time of a fixing operation is applied in the fixing nip and a second state in which the pressure at the time of the fixing operation is not applied in the fixing nip, wherein when electric power is supplied to the heater in the second state, the switching mechanism operates to switch the state of the fixing nip from the second state to the first state. | 11-03-2011 |
| 20110200344 | IMAGE FORMING APPARATUS - When the temperature of a fixing section has not reached a fixable temperature and the condition of an image forming apparatus is an abnormal temperature rising condition, a print controller causes a toner image conveying section to move a toner image on an intermediate transfer member to a predetermined toner image standby position upstream of a secondary transfer section and to put the toner image on standby at the toner image standby position, and causes a recording medium conveying section to put a recording medium on standby at a predetermined sheet standby position upstream of the secondary transfer section. Thereafter, when the temperature of the fixing section reaches the fixable temperature, the print controller causes the secondary transfer section to transfer the toner image on the intermediate transfer member onto the recording medium. | 08-18-2011 |
| 20090297181 | FIXING APPARATUS - In one embodiment of the present invention, a fixing apparatus that causes a recording material to pass through a nip portion formed by a rotating heat roller and a rotating pressure roller being in contact so as to perform a fixing operation is configured including a pressing mechanism that can switch between a pressure applied state in which the pressure roller presses against the heat roller using a bias and a pressure cancelled state in which the pressure is cancelled, a pressure state detection unit, and a control unit that performs a pressure cancelation operation and a pressure application operation. If the pressure state detection unit does not detect the pressure cancelled state even when the control unit has performed pressure cancellation control for a certain time period with respect to the pressing mechanism in the pressure applied state, the control unit permits a fixing operation in only the pressure applied state after performing pressure application control for a certain time period with respect to the pressing mechanism. | 12-03-2009 |
| 20090290888 | FIXING APPARATUS AND IMAGE FORMING APPARATUS PROVIDED WITH FIXING APPARATUS - A fixing apparatus according to one embodiment of the present invention comprises a rotating hot roller, a rotating pressure roller, a heating belt that contacts the hot roller and conducts heat, a first support roller and a second support roller that are heated by a heat source, support the heating belt suspended therebetween, and conduct heat to the heating belt, a first temperature detection means that detects a first temperature of an area of the first support roller where it contacts the heating belt or an area of the heating belt where it contacts the first support roller, a second temperature detection means that detects a second temperature of an area of the second support roller where it contacts the heating belt or an area of the heating belt where it contacts the second support roller, and a means for detecting rotation stoppage of one of the support rollers. | 11-26-2009 |
| 20090297180 | Fixing Device - A fixing device including a heating element and a pressure element, for fixing a developer image transferred onto a recording sheet is provided. The pressure element is configured to be positioned selectively in two or more pressing positions defined relative to the heating element. The pressure element in any one of the pressing positions is configured to be pressed against the heating element. A plurality of interrupter elements are provided opposite to the heating element. Each of the interrupter elements is configured to sense a temperature of the heating element and to interrupt a flow of electrical current to a heat source for heating the heating element when the temperature is not lower than a predetermined threshold value. The interrupter elements are arranged in positions corresponding to the pressing positions. | 12-03-2009 |
| 20100290796 | HEATING DEVICE AND IMAGE FORMING APPARATUS HAVING THE SAME - A heating device includes: a driving member configured to rotate; a driven member configured to rotate with the rotation of the driving member; a heater configured to heat a surface of one of the driving member and the driven member; a temperature detector configured to measure the temperature of the heated surface; and a controller operable to control heating of the heater based on the measurement result of the temperature detector. The controller includes: a calculator operable to calculate a change ratio of a slope of a temperature change of the heated surface with time, based on a first temperature detected by the temperature detector at a first time point and a second temperature detected by the temperature detector at a second time point a predetermined time interval after the first time point; and a determiner operable to determine that an abnormality occurs when the change ratio exceeds a threshold. | 11-18-2010 |
| 20080240748 | FIXING DEVICE - A fixing device of the invention detects a temperature of plural positions of a heat roller by a multiple non-contact temperature sensor at the same time and controls the temperature of plural heat source members The non-contact temperature sensor and a contact temperature sensor detect the temperature of the same position. According to the detection result, maintenance is performed or a temperature conversion table is corrected, the non-contact temperature sensor is maintained with high precision, and the heat roller is controlled the temperature with high precision. | 10-02-2008 |
| 20090162081 | ELECTROPHOTOGRAPHIC APPARATUS HAVING BELT FUSER AND CORRESPONDING METHODS - Disclosed are an electrophotographic apparatus for forming images on sheets, and corresponding methods. The electrophotographic apparatus includes an endless fuser belt for fusing toner particles to the sheets to form the images, a sensor for detecting a defect position of at least one defect in the endless fuser belt, and a controller that receives the defect position of the at least one defect on the endless fuser belt from the sensor, wherein the controller positions the endless fuser belt relative to the sheets to avoid the at least one defect from coming into contact with the toner on the sheets during fusing of the toner particles to the sheets. | 06-25-2009 |
| 20110222876 | Fixing device and image forming apparatus using the same - A fixing device includes a fixing member, a pressure member, and a damage detecting unit. The fixing member includes a heat-insulating elastic layer, to which a conductive thin-film layer is provided. The pressure member presses against the fixing member to form a fixing nip. The damage detecting unit detects the electric resistance of the thin-film layer. The damage detecting unit detects a change in the electric resistance of the thin-film layer, thereby detecting damage to the fixing member. Depending on the extent of the damage, the condition of conveyance of a recording medium to the fixing nip is changed. | 09-15-2011 |
| 20110222875 | FIXING UNIT AND IMAGE FORMING APPARATUS INCLUDING SAME - A fixing unit removably installable in an image forming apparatus includes an endless fixing member; a metal member disposed in proximity to an inner surface of the fixing member; a nip formation member supported by the metal member to slidably contact the fixing member or oppose the fixing member via a slide sheet; a heater to heat the metal member to heat the fixing member; a rotary pressing member to rotate the fixing member, disposed opposite the nip formation member via the fixing member to form a nip between the rotary pressing member and the fixing member; a rotation detector to detect a rotational state of the fixing member. Heating rotation of the fixing member is continuously performed until a predetermined rotational state of the fixing member is obtained, to spread lubricant substantially uniformly at least between the fixing member and the metal member. | 09-15-2011 |
| 20110222874 | FIXING DEVICE AND IMAGE FORMING APPARATUS INCLUDING SAME - A fixing device for fixing a toner image on a recording medium includes a fixing roller, a pressing roller, and at least one of a sheet guide, a sheet separation plate, and an electric component module. The fixing roller rotates in a predetermined direction of rotation. The pressing roller rotates and contacts an outer circumferential surface of the fixing roller to form a nip between the pressing roller and the fixing roller through which the recording medium bearing the toner image passes to fix the toner image by heat and pressure. The position of the pressing roller is changeable relative to the fixing roller. At least one of the sheet guide, the separation plate, and the electric component module moves in conjunction with movement of the pressing roller as a single integrated unit without changing relative positions with respect to the pressing roller. | 09-15-2011 |
| 20110229162 | Fixing device and image forming apparatus - A fixing device includes a fixing member, an induction heating unit, a pressing member, and a damage detection unit. The fixing member heats a toner image on a recording medium to fix the toner image onto the recording medium. The induction heating unit heats the fixing member by electromagnetic induction. The pressing member presses the fixing member to form a fixing nip portion. The fixing member includes a heat insulating elastic layer and a sleeve layer. The sleeve layer is located outside the heat insulating elastic layer and is provided with an outer conductive layer that generates heat from a magnetic flux generated by the induction heating unit. The damage detection unit is connected to the outer, conductive layer. | 09-22-2011 |
| 20110229161 | THERMAL FIXING DEVICE AND IMAGE FORMING APPARATUS INCLUDING SAME - A thermal fixing device includes a fixing member, a flexible endless belt, a flexible endless belt, a rotary pressure member, a heating unit, and a rotation detector. The flexible endless belt is disposed on an outer circumferential surface of the fixing member. The rotary pressure member is disposed parallel to and pressing against the fixing member via the endless belt. The heating unit heats the endless belt. The rotation detector detects a rotation speed of the endless belt. The heating unit is powered off when the rotation speed of the endless belt detected by the rotation detector is at or below a predetermined threshold value. | 09-22-2011 |
| 20090110415 | CONTROL TO DETECT AIR KNIFE BLOCKAGE - A system for detecting stripper device blockage in a printing system is disclosed. The system includes a fusing member which during operation contacts a sheet of printer media to fuse a marking material to the sheet, a stripping device configured to apply pressurized air from an air supply through at least one orifice to the fuser member in order to separate the sheet from the surface and a flow measurement device in line with the air supply which measures air flow. The air flow device will assist in performing an assessment check which may include taking a baseline measurement of air flow and a diagnostic measurement of air flow. In the case where the difference between the diagnostic measurement and baseline measurement is above a different threshold, corrective action may be taken. | 04-30-2009 |
| 20080232831 | IMAGE FORMING APPARATUS - An image forming apparatus includes an overheat prevention device to control a heater based on a fusing temperature detected by a temperature sensor within a predetermined range when a controller generates an abnormal heater control signal. | 09-25-2008 |
| 20110058826 | APPARATUS AND METHOD TO PROTECT HALF OR FULL BRIDGE CIRCUIT INCLUDING FIRST SWITCHING UNIT AND SECOND SWITCHING UNIT IN IMAGE FORMING APPARATUS PERFORMING INDUCTION HEATING - An apparatus to protect a half or full bridge circuit including a first switching unit and a second switching unit in an image forming apparatus performing induction heating, the apparatus including a switching control unit to control operations of the first switching unit and the second switching unit by generating and outputting a first driving signal to turn on or off the first switching unit and a second driving signal to turn on or off the second switching unit; and an arm-short detecting unit to output a disable signal to stop operation of the switching control unit in response to the first driving signal and the second driving signal simultaneously being signals to turn on the first switching unit and the second switching unit. | 03-10-2011 |
| 20120141150 | IMAGE FORMING APPARATUS AND FIXING UNIT CONTROL METHOD THEREOF - Disclosed are an image forming apparatus and a fixing unit control method thereof, the image forming apparatus including an image forming unit, a fixing unit, a power supply to supply operating power to the fixing unit, a temperature sensor to sense a temperature of the fixing unit, a first protection unit to compare the sensed result of the temperature sensor with a first predetermined reference value and to output a signal, a switching unit to turn on/off power supplied to the fixing unit in accordance with the signal output from the first protection unit, a second protection unit to compare the sensed result of the temperature sensor with a second predetermined reference value and to output a signal, and a relay unit to turn on/off the operating power supplied to the fixing unit in accordance with the signal output from the second protection unit. | 06-07-2012 |
| 20120195606 | IMAGE FORMING APPARATUS - Damages on fixing members caused by paper passing through can be reduced. The registration rollers | 08-02-2012 |
| 20090279908 | APPARATUS FOR IMAGE FORMATION - An apparatus for image formation comprises a fixing member, a pressing member, a heating member, a sensor, and a controller. The heating member heats at least one of the fixing and pressing members during a heating operation. The sensor senses the surface temperature of at least one of the fixing and pressing members. If the surface temperature sensed by the sensor exceeds a threshold temperature, the controller stops the heating operation of the heating member. If the sensed temperature drops below the threshold temperature, the controller starts the heating operation of the heating member. The controller includes a period measuring unit for measuring the switching period at which the controller switches the starting and stopping of the heating operation of the heating member. The controller restrains the heating of the fixing and pressing members if the switching period exceeds a reference time. | 11-12-2009 |
| 20100329705 | CONTROL OF OVERHEATING IN AN IMAGE FIXING ASSEMBLY - An image fixing assembly includes a heating unit having a heating element and a fusing member enclosing the heating element; a backup member; and a heat conducting member. The fusing member is configured to rotate around the heating element. Further, the fusing member is capable of being heated by the heating element. The backup member is abuttingly coupled to the fusing member for configuring a nip portion therebetween, and is capable of pressing media sheets against the fusing member, when the media sheets pass through the nip portion. The heat conducting member is capable of retractably coupling to one of the fusing member and the backup member for enabling flow of heat between the one of the fusing member and the backup member, and the heat conducting member, for reducing a thermal gradient. Further disclosed is a method for fixing images on the media sheets using the image fixing assembly. | 12-30-2010 |
| 20110044706 | Fixing device and image forming apparatus including same - A fixing device including a fixing member; a heat source to heat the fixing member; a power supply to supply power to the heat source; a thermostat provided in the middle of a circuit connecting the heat source and the power supply to block power supply from the power supply to the heat source upon detection of a temperature of the fixing member equal to or greater than a predetermined temperature; a support member to contact terminals fixed to the thermostat to support the thermostat; and electrode plates provided opposite the support member with a gap therebetween to form a part of the circuit by connecting to surfaces of the terminals of the thermostat opposite surfaces thereof contacting the support member while the terminals are positioned within the gap. The electrode plates include a first guide part to guide the terminals into the gap. | 02-24-2011 |
| 20120243889 | THERMAL SWITCH, MOUNTING STRUCTURE, FIXING DEVICE, AND IMAGE FORMING APPARATUS - A thermal switch includes a body that includes a pair of electrodes and is inserted into an insertion hole formed at a mounting portion so as to be mounted on the mounting portion, a displacement member that is held on the body and displaced according to temperature change, a synchronization member that is provided at the body and separates one contact of the pair of electrodes from the other contact thereof in synchronism with the displacement of the displacement member, and regulating portions that are provided at the body and regulate the separation of the body from the insertion hole. | 09-27-2012 |
| 20100054767 | IMAGE FORMING APPARATUS AND RECORDING MEDIUM ON WHICH INTERRUPT CONTROL PROGRAM IS RECORDED - An image forming apparatus is provided having a fixing device which heats a fixing roller from the surface thereof by means of an external heating device, which image forming apparatus is capable of improving fixability immediately just after a start-up and enhancing a job efficiency. An image forming apparatus includes a toner image forming section, a transfer section, a fixing device, and an interrupt control section. At least two levels are set as a job interrupt reference temperature, the interrupt control section individually selects, from among the at least two levels of job interrupt reference temperature, the level to be used for either or both of a job immediately after the start-up from a power-on and a job immediately after a return from a sleep mode, and the level(s) for other job(s), and carries out an interrupt control using the selected level of job interrupt reference temperature. | 03-04-2010 |
| 20100054766 | FIXING UNIT CONTROLLING APPARATUS AND IMAGE FORMING APPARATUS INCLUDING THE SAME - A fixing unit controlling apparatus that includes a switching unit of a power supplier to supply power to a fixing unit according to a power supply controlling signal to control a temperature of the fixing unit, and a switching unit of a power shutter to shut off power supplied to the fixing unit when the fixing unit controlling apparatus operates abnormally, wherein the switching units of the power supplier and the power shutter are both connected to a snubber circuit of the power shutter. | 03-04-2010 |
| 20120201550 | FIXING DEVICE AND IMAGE FORMING APPARATUS PROVIDED WITH FIXING DEVICE - A fixing device includes a fixing roller, a heating member, a pressure roller, a first temperature detecting element that detects a temperature of a contact region of the fixing roller that comes into contact with a paper, and a second temperature detecting element that detects a temperature of a noncontact region, and in which energization control of the heating member is carried out by the first one, and energization control is stopped when a temperature detected by the second reaches a prescribed temperature, the device including a conduction shutoff portion that, shuts off the energization where the temperature of the contact region has reached an upper limit, wherein, in which a center of the paper in an axial direction of the fixing roller has been aligned with a reference position of the fixing roller, the paper is transported, and the first one and the shutoff portion are placed symmetrically. | 08-09-2012 |
| 20110052224 | FAILURE DIAGNOSIS DEVICE, FAILURE DIAGNOSIS METHOD, IMAGE FORMING DEVICE, AND RECORDING MEDIUM - A first feature quantity computing unit that computes a first feature quantity representing an average of a plurality of driving loads recorded by a driving load of a fixing section recording unit of an image forming device that records the driving load acquired by a driving load acquiring unit that acquires the driving load, a second feature quantity computing unit that computes a second feature quantity representing a deviation of the plurality of the driving loads, and a diagnosis unit that performs failure diagnosis including estimation of a cause of a failure of the fixing section using the first feature quantity and the second feature quantity are used. | 03-03-2011 |
| 20100260508 | FIXING DEVICE WHICH DETECTS ANOMALY OF HEATER - A fixing device shifts to the anomaly detection mode in arbitrary timing except during printing. In the anomaly detection mode, a first heat generation member and a second heat generation member are off and only a third heat generation member is turned on for a predetermined time. A quantity of temperature change in a fixing member during that time is detected by a first temperature detection member or a second temperature detection member. When the quantity of temperature change is within a predetermined range, it is determined that the third heat generation member is normal. In inspecting whether the third heat generation member is normal or not, when the temperature of the fixing member is in the area exceeding T1° C. where the temperature rise gradient of the fixing member is gentler, the inspection is skipped. | 10-14-2010 |
| 20090317100 | FIXING DEVICE AND IMAGE FORMING APPARATUS - A fixing device includes a fixing roller, a pressure roller and a soaking roller. Temperature of the soaking roller, which contacts with the pressure roller, is measured by a temperature measurement section. This makes it possible to precisely estimate the temperature distribution of the fixing roller and the pressure roller including a non-paper feed area of paper sheets. Based on the temperature of the soaking roller, fixing operation is controlled by a fixing operation control section. Thereby, optimal control can be implemented to suppress the temperature rise in the non-paper feed area according to the estimated temperature distribution of the fixing roller and the pressure roller. | 12-24-2009 |
| 20090252506 | FIXING APPARATUS, PRINTING APPARATUS, AND COMPUTER READABLE MEDIUM STORING A PROGRAM FOR DETECTING TWINE - The present invention provides a fixing apparatus including: a pair of rotating bodies that transports a recording medium on which an image is formed by using an image forming material, by sandwiching the recording medium; a heating section that heats at least one of the pair of rotating bodies; a moving section that moves the pair of rotating bodies between a position at which they mutually contact and a position at which they are mutually separated; a temperature detecting section that detects a surface temperature of at least one of the pair of rotating bodies without contacting the rotating bodies; and a twine generation determining section that determines whether the recording medium has twined around either one of the pair of rotating bodies based on a rate of temperature increase after a temperature decrease of the surface temperature detected by the temperature detecting section. | 10-08-2009 |
| 20080267643 | FIXING APPARATUS - A fixing apparatus including a rotation detection circuit which detects the rotation state of the rotating member or pressing member, and one to (N−1) limiting circuits which limit driving of one to (N−1) driving circuits in accordance with an output from the rotation detection circuit, wherein when the rotation detection circuit detects that the rotating member or pressing member is not rotating, the one to (N−1) limiting circuits limit driving of the one to (N−1) driving circuits in accordance with the output from the rotation detection circuit to suppress energization of the heating elements regardless of the driving signals from the control unit to the driving circuits. | 10-30-2008 |
| 20120148273 | IMAGE FORMING APPARATUS - An apparatus is capable of switching between a mode in which a first resistance heating element and a second resistance heating element are connected in series and a mode in which they are connected in parallel. When a temperature increase rate detected by a temperature detection unit is smaller than a threshold rate although a current detected by a current detection unit is greater than a threshold current, a notification of a failure is issued. | 06-14-2012 |
| 20110164889 | Heating unit and its malfunction determining method, image fixing device, and image forming apparatus - Disclosed are a heating unit and its malfunction determining method, an image fixing device including the heating unit, and an image forming apparatus including the image fixing device. The method comprises a temperature detection step of detecting temperature of a heating body in the heating unit; a first malfunction determination step of obtaining a temperature rise time of the heating body, and then determining whether there is malfunction in the heating unit; and a second malfunction determination step of calculating a temperature increase rate of the heating body, and then determining whether there is malfunction in the heating unit. | 07-07-2011 |
| 20110020018 | FIXING DEVICE AND IMAGE FORMING APPARATUS USING SAME - A fixing device includes a fixing member including a recording medium passing area inside thereof through which the recording medium passes, a first heater disposed in the fixing member to heat the fixing member, a first pressing member disposed opposite the fixing member to press against and rotate the fixing member to fix the unfixed toner image on the recording medium, a second heater disposed outside the recording medium passing area and inside the fixing member to heat the fixing member cyclically in a given cycle of heating, a temperature detector to detect a change in the temperature of the fixing member when the fixing member is cyclically heated by the second heater, and a determination unit to evaluate a condition of rotation of the fixing member based on the cycle of heating by the second heater and the cycle of change in the temperature detected by the temperature detector. | 01-27-2011 |
| 20110026947 | FIXING DEVICE, CONTROL METHOD FOR A FIXING DEVICE AND IMAGE FORMING APPARATUS - Provided is a fixing device including: a heater; a heating body that is heated by the heater and is caused to rotate; a pressure body that is in contact with the heating body, and is caused to rotate; a plurality of temperature sensor units each including a temperature sensing element that is covered with a protective member and is in contact with the heating body in order to sense a temperature of the heating body; and a control unit that recognizes temperatures of the heating body at respective portions thereof based on signals received from the temperature sensor units, brings the heater into an ON state if the recognized temperatures exhibit a temperature difference of a predetermined value or larger, judges that the protective member has peeled off if all the temperatures sensed by using the temperature sensor units are recognized to have risen, and corrects the temperature. | 02-03-2011 |
| 20110217057 | Fixing device and image forming apparatus including same - A fixing device includes a heat conductive member; a flexible fixing belt looped around the heat conductive member, an inner circumference of the flexible fixing belt slidably contacting a portion of an outer circumferential surface of the heat conductive member; a rotary pressing member disposed opposing the heat conductive member; heat sources disposed in a circumferential direction of the fixing belt at a predetermined interval to heat the heat conductive member; and temperature detectors provided to detect a surface temperature of the fixing belt at a detection position at which heating intensity of a corresponding one of the heat sources is not affected by any other one. In operation, the inner circumferential surface of the fixing belt contacts the heat conductive member at a position at which each temperature detector contacts the fixing belt as the detection position or a position proximal to the detection position of each temperature detector. | 09-08-2011 |
| 20110217056 | Fixing device and image forming apparatus including same - A fixing device includes a substantially cylindrical metal member, a heater, an endless, flexible fixing member, a rotary pressing member, a stationary member, a first temperature detector, and a second temperature detector. The first temperature detector is disposed upstream from a nip in a rotation direction of the fixing member to detect a surface temperature of the fixing member. The second temperature detector is disposed downstream from the nip in a rotation direction of the pressing member to detect a surface temperature of the pressing member. When a difference between a surface temperature of the fixing member detected by the first temperature detector and a surface temperature of the pressing member detected by the second temperature detector after a predetermined time has elapsed since the first temperature detector detects the surface temperature of the fixing member is greater than a predetermined threshold, the heater stops heating the metal member. | 09-08-2011 |
| 20120251138 | Fuser Unit - A fuser unit includes: a cylindrical member; a heat generator; a nip member; a backup member, which configures a nip part between the cylindrical member and the backup member with the cylindrical member; a conductive member, which is arranged to cover the heat generator at the inside of the cylindrical member; a temperature detection unit; a wiring; a first frame having insulation, which is arranged at an opposite side to the heat generator with respect to the conductive member being interposed therebetween at the inside of the cylindrical member, and which extends along the conductive member; and a second frame, which is arranged at an opposite side to the conductive member with respect to the first frame being interposed therebetween at the inside of the cylindrical member, and which extends along the first frame, wherein the wiring is arranged between the first frame and the second frame. | 10-04-2012 |
| 20120045226 | FIXING DEVICE AND IMAGE FORMING APPARATUS - A fixing device includes a fixing rotation body heating and fixing an unfixed image onto a recording medium; a pressing rotation body pressing the recording medium to the fixing rotation body; and a temperature detection unit detecting a temperature of the pressing rotation body. Further, when a predetermined time period elapses since a warm-up operation has started before a temperature detected by the temperature detection unit is equal to or greater than a predetermined temperature or when the temperature detected by the temperature detection unit is equal to or greater than the predetermined temperature before the predetermined time period elapses since a warm-up operation has started, the fixing device determines that the warm-up operation is finished. | 02-23-2012 |
| 20120301161 | FIXING DEVICE, HEATER CONTROL METHOD, AND IMAGE FORMING APPARATUS INCORPORATING SAME - A fixing device includes a rotary, endless fuser belt, a heater, a thermometer, and a controller. The fuser belt is subjected to heating, on which the recording medium is conveyed to fuse the toner image thereon. The heater is located adjacent to the fuser belt for heating the belt. The thermometer is located adjacent to the fuser belt to detect an operational temperature of the belt. The controller is operatively connected to the thermometer and the heater to deactivate the heater upon detecting an abnormal condition in which the operational temperature detected remains below a setpoint temperature after lapse of a warm-up time limit since activation of the heater. The controller includes a historical data recorder and a processor. The historical data recorder records historical usage data of the fixing device since installation. The processor adjusts the warm-up time limit according to the historical usage data recorded. | 11-29-2012 |
| 20120301162 | FIXING DEVICE AND IMAGE FORMING APPARATUS - A fixing device includes a temperature measuring unit, configured to measure the temperature in regions that extend partially along the outer surface of a heating rotating body, which includes a resistance heating layer, in the circumferential direction and are aligned in the direction of the axis of rotation of the heat rotating body, and a control unit configured to sample temperatures, measured by the temperature measuring unit in each of the regions, over the entire outer surface of the heating rotating body in the circumferential direction by causing the heating rotating body to rotate while supplying a predetermined amount of power to the resistance heating layer, and to determine whether an abnormality has occurred in the resistance heating layer based on the difference between the maximum temperature and the minimum temperature among the sampled temperatures in each region. | 11-29-2012 |
| 20120155895 | IMAGE FORMING APPARATUS - The present invention provides a low-cost and safe image forming apparatus that has a first state in which first and second resistance heating bodies of a heater are connected in series, a second state in which the first and second resistance heating bodies are connected in parallel, and a third state in which a first switching unit shuts off a power supply path and a second switching unit is connected to a first power source terminal to block power supply to the heater. | 06-21-2012 |
| 20110076037 | FIXING APPARATUS AND IMAGE FORMING APPARATUS - A fixing apparatus which heat-fixes a toner image transferred onto a sheet, including: a heating device configured to generate eddy currents in a conductive heating element using a magnetic core and an exciting coil to produce heat; a core moving unit configured to move the core; a current detecting unit configured to detect a current flowing through the exciting coil; and an abnormal signal output unit configured to output a signal indicating an abnormality when a difference between a first current value and a second current value is smaller than a predetermined threshold value, the first current value being detected by the current detecting unit before the core is moved by the core moving unit, the second current value being detected by the current detecting unit after the core is moved by the core moving unit. | 03-31-2011 |
| 20110091226 | Failure predictor, fixing device, image forming apparatus, and failure prediction system - A failure predictor for predicting failure of a fixing device including a first characteristics value extractor to extract a first characteristics value representing a time interval between each implementation of repair of a surface of one of a pair of rotary bodies, a second characteristics value extractor to extract a second characteristics value representing a change in a degree of glossiness on the surface of one of the pair of rotary bodies during a period of time between before and after repair of the surface of one of the pair of rotary bodies, a third characteristics value extractor to extract a third characteristics value representing a change in a current value of a drive motor, and a determination device to predict failure of the fixing device caused by the condition of the surface of one of the pair of rotary bodies using the extracted first, second, and third characteristics values. | 04-21-2011 |
| 20110091225 | IMAGE HEATING APPARATUS - An image heating apparatus includes a coil; a rotatable image heating member for generating heat by a magnetic flux generated by the coil to heat an image on a recording material; a voltage source for applying a high frequency current to the coil; a temperature detecting member for detecting a temperature of the image heating member; control device for controlling electric power supply to the coil from the voltage source on the basis of an output of the temperature detecting member such that the temperature of the image heating member is maintained at a set temperature T; and protecting device for stopping the electric power supply to the coil when the output of the temperature detecting member indicates a predetermined abnormal temperature Te, wherein at least a part of the image heating member is made of a magnetism-adjusted alloy having a predetermined magnetic permeability decrease start temperature Tc′ and a predetermined Curie temperature, and wherein T≦Tc′| 04-21-2011 | |
| 20100172661 | IMAGE FORMING APPARATUS AND CONTROLLING METHOD THEREOF - An image forming apparatus and a controlling method thereof. The image forming apparatus includes a fixing member having a heating source to heat a developer of a recording medium, a power supply unit to the heating source, first and second temperature sensors for respective first and second positions on the fixing member, a width sensor for the recording medium, and a control unit, when a difference between the first temperature and the second temperature is greater than a predetermined reference value, determining whether the first temperature is abnormal based on the width of the recording medium and, when the first temperature is abnormal, interrupting the power supply to the heating source. An error in the temperature sensor is determined when a temperature difference between the first and second position of the fixing member is greater than a predetermined degree and the recording medium passes through both temperature sensors. | 07-08-2010 |
| 20120121277 | Image forming apparatus and fixing unit control method thereof - An image forming apparatus including: an image forming unit which forms an image; a fixing unit which fixes the image transferred to a printing medium; a power supply which supplies operation power to the fixing unit; a contactless sensor sensing a temperature of the fixing unit and respectively outputting a sensor-sensing voltage and a sensor-compensating voltage; and a contactless-sensing protector which shuts off the power if the sensor-sensing voltage is higher than the sensor-compensating voltage. The fixing unit can be protected from overheating and control error through the contactless-sensing protector for sensing the fixing temperature and shutting off the power. | 05-17-2012 |
| 20120076521 | FIXING DEVICE AND IMAGE FORMATION APPARATUS - A fixing device for fixing an unfixed toner image on a recording sheet by passing the recording sheet through a fixing nip and applying heat and pressure to the recording sheet, the fixing device comprising: a heater including a resistance heater part and a supporting member, the resistance heater part having a positive resistance-temperature characteristic in a temperature range above a predetermined level, and the supporting member being insulative and supporting the resistance heater part such that the resistance heater part applies heat to the recording sheet; a current detector detecting a current supplied to the resistance heater part; and an abnormality determiner determining whether the resistance heater part has an abnormality, based on an initial current detected by the current detector at a predetermined time after a beginning of power supply to the resistance heater part and before the temperature of the resistance heater part reaches the predetermined level. | 03-29-2012 |
| 20100046968 | OPTICAL MEASUREMENT SYSTEM AND METHOD FOR DETERMINING WEAR LEVEL OF PRINTER COMPONENTS - Optical measurement system and method for determining a wear level of printer components such as fuser rolls. Papers can be treated with optical brighteners, which act as distinct tag/trace molecules with fluorescent properties. A fluorescence pattern on the fuser roll can be changed in accordance with the edge density distribution in the print engine, when paper edges are accumulated on the fuser roll surface. A photo detector can capture a two-dimensional, digital image of the fluorescence pattern on the fuser roll surface to be measured, after illuminating the fuser roll, with intensity near ultraviolet range, by a light source. An image processor with a parameterized model can measure changes in the fluorescence pattern by analyzing the digital image of the fuser roll surface in order to determine the level of edge wear on the fuser rolls. | 02-25-2010 |
| 20120177388 | Fixing Device And Image Forming Apparatus Employing Same - A fixing device comprises a rotatable endless flexible belt, a drive roller opposed to the rotatable endless flexible belt to contact and drive an outer circumferential surface of the rotatable endless flexible belt, and a nip formation device receiving pressure from the drive roller via the rotatable endless flexible belt to form a nip thereon to sandwich and convey a recording sheet. A heat source is provided to generate heat and heat the nip. Each of the end roller portions of the drive roller has a higher friction coefficient surface than a central roller portion of the drive roller sandwiching the recording sheet. These end roller portions are composed of separate bodies from the central roller portion and detachably attachable from and to the central roller portion. | 07-12-2012 |
| 20120251136 | HEAT-RESPONSIVE SWITCH, FIXING DEVICE, AND IMAGE FORMING APPARATUS - A heat-responsive switch includes a case member, a deformation member deformed from a shape concave to an inside of the case member to a convex shape in response to a temperature variation, a first electrode having a first contact, a second electrode having a second contact and bringing the second contact into contact with the first contact with the first contact impelled to the deformation member, a first pressing member pressing the first electrode to separate the first contact from the second contact by having an end pressed by the deformation of the deformation member into the convex shape, and a second pressing member pressing the deformation member to restore the deformation member to the concave shape and pressing the second electrode to keep the first contact and the second contact separated by having the end pressed to the deformation member from an outside of the case member. | 10-04-2012 |
| 20120251137 | THERMALLY-ACTUATED SWITCH, FIXING DEVICE, AND IMAGE FORMING APPARATUS - A thermally-actuated switch includes a movable member that is provided between a second electrode and a displacement member so as to be movable in a first direction, is pushed at one end by the displacement member in a concave state to push the second electrode at the other end to bring a second contact into contact with a first contact, and is moved in the first direction by an urging force acting on the second electrode due to convex displacement of the displacement member, and a regulating member that regulates movement of the movable member in a second direction orthogonal to the first direction from a transmittable position where a pushing force from the displacement member is capable of being transmitted to the second electrode, and releases the regulation such that the movable member moved in the first direction by the urging force is removed from the transmittable position. | 10-04-2012 |
| 20080310866 | FUSING UNIT AND IMAGE FORMING APPARATUS INCLUDING THE SAME - A fusing unit comprises a heating unit, a first roller and a second roller, at least one of which is heated by the heating unit, a belt which moves along the first roller and the second roller, a roller supporting unit which supports at least one of the first roller and the second roller, and a belt tension control unit which moves at least one of the first roller and the second roller so that the first roller and the second roller can move toward or apart from each other. | 12-18-2008 |
| 20080298824 | IMAGE FORMING APPARATUS, METHOD OF CONTROLLING FIXING DEVICE, AND DEVICE AND METHOD FOR DETECTING ABNORMALITY OF THE FIXING DEVICE - An image forming apparatus which is capable of detecting occurrence of an abnormality that a fixing member which is actually in an unpressurized state is detected to be in a pressurized state, and supply of electric power to a heating member is continued. A fixing device includes a fixing belt and a pressure roller. The fixing belt and the pressure roller are pressed against each other such that a nip is formed therebetween, for nipping and conveying a transfer material through the nip while heating and pressing the same. A pressurizing unit selectively switches between a pressurizing state and an unpressurizing state. When the pressurizing unit is in the pressurized state, a heater heats the fixing belt. The heating of the fixing belt is stopped based on a temperature detected by a thermistor after a lapse of a predetermined time period from start of the heating. | 12-04-2008 |
| 20110274449 | HEATING CONTROL DEVICE, HEATING CONTROL METHOD, AND IMAGE FORMING APPARATUS - A heating control device which is capable of detecting an abnormality of an object to be heated accurately. A power-supply unit applies the electric power to the electromagnetic induction heating coil. A magnetic flux detecting unit detects a magnetic flux emitted from the electromagnetic induction heating coil across the object, and outputs a voltage corresponding to the detected magnetic flux. A changing unit changes at least one of the detected magnetic flux voltage value and an abnormality detection threshold value based on relationship between an electric power set value that defines the electric power and an input voltage inputted to the power-supply unit. A determination unit compares the detected magnetic flux voltage value changed by the changing unit to the abnormality detection threshold value, and determines an abnormality of the object when the detected magnetic flux voltage value is larger than the abnormality detection threshold value. | 11-10-2011 |
| 20120087681 | HEATING DEVICE HAVING HIGH DEGREE OF FREEDOM IN DESIGN, AND IMAGE FORMING APPARATUS - A heating device and an image forming apparatus which make it possible to improve the degree of freedom in design to enhance the accuracy of detecting the state of a to-be-heated member, and easily reduce cost. An induction heating coil generates magnetic flux by flow of electric current therethrough. Ferrite cores formed of a magnetic material form magnetic paths. The fixing belt generates heat by the action of the magnetic flux generated by the induction heating coil | 04-12-2012 |
| 20110305469 | HEATING APPARATUS AND VOLTAGE DETECTION APPARATUS - A voltage detection apparatus is configured to detect a voltage value applied to a first or second current path of a heater. The voltage detection apparatus detects a first period during which the voltage value of the first or second current path exceeds a threshold voltage as well as a second period during which electric power is supplied to the first current path or the second current path to control the electric power supplied to the first and second current paths. The voltage detection apparatus uses a detection result to detect a state where over-power is supplied to the heater. | 12-15-2011 |
| 20110311246 | Fixing Device, Image Forming Apparatus, and Method for Controlling Fixing Device - A fixing device includes a fixing roller that is driven to rotate, a fixing belt that is driven by rotation of the fixing roller, and a driven roller that rotates along with the fixing belt. The fixing device also includes a pressing member that is pressed against the fixing roller with the fixing belt interposed therebetween to form a nip portion, a measuring unit that measures a rotation speed of the driven roller, and a control unit that adjusts a fixing condition based on the rotation speed of the driven roller. | 12-22-2011 |
| 20120328308 | IMAGE FORMING APPARATUS, IMAGE FORMING METHOD, AND FIXING APPARATUS - According to one embodiment, an image forming apparatus includes an image forming section configured to form a toner image on a medium, a fixing device including a heating member configured to heat the medium and a pressurizing member configured to come into contact with the heating member via the medium and heat the medium, and a control section configured to stop, if the temperatures of the heating member and the pressurizing member deviate from a predetermined temperature range, the image forming operation, separate the heating member and the pressurizing member, and control the respective temperatures within the predetermined temperature range. | 12-27-2012 |
