JP2004310055A - Heating device, fixing device and image forming apparatus using the heating device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To perform efficient charging in an image forming apparatus possessing a fixing device provided with a capacitor capable of being charged and discharged by a capacitor. <P>SOLUTION: In a heating device provided with a main heating device 2a, a main power source device 3 to supply the main heating device 2a with electric power, an auxiliary heating device 2b, an auxiliary power source device 4 provided with the capacitor C which heats the auxiliary heating part by supplying the electric power and is capable of being charged and a controlling means 8 to control the charge/discharge of the auxiliary power source device 4, the controlling means 8 controls the charge to the capacitor C by the auxiliary power source device 4 while the image forming device where a heating device 2 is arranged is operated or when it is not operated and also the capacitor C is capable of being charged. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a heating device, a fixing device and an image forming apparatus using the same, and more particularly, to a main heating unit, a main power supply device for supplying power to the main heating unit, an auxiliary heating unit, and supplying power to the auxiliary heating unit. The present invention relates to an auxiliary power supply device having a power storage device that can be heated and charged, and a heating device including a control unit power storage device for controlling charging and discharging of the auxiliary power supply device, a fixing device and an image forming apparatus using the same.

  2. Description of the Related Art In an image forming apparatus such as a copying machine, an image is formed on a recording medium such as plain paper or OHP, and an electrophotographic method is often used because of high speed of image formation, image quality, cost, and the like. The electrophotographic method is a method in which a toner image is formed on a recording medium, and the formed toner image is fixed on the recording medium by heat and pressure. As a fixing method, a heat roller method is currently most frequently employed in terms of safety and the like. In the heat roller method, a heating roller heated by a heating member such as a halogen heater and a pressure roller arranged opposite to the heating roller are pressed to form a mutual press contact portion called a nip portion, and a toner image is formed in the nip portion. Is heated and pressed through the recording medium onto which the toner has been transferred, thereby fixing the toner to the recording medium.

  2. Description of the Related Art In recent years, environmental issues have become important, and image forming apparatuses such as copiers and printers have been saving energy. In considering the energy saving of the image forming apparatus, what cannot be ignored is the power saving of the fixing device that fixes the toner on the recording medium. Therefore, in order to reduce the power consumption of the fixing device during the standby time of the image forming apparatus, the temperature of the heating roller is maintained at a fixed temperature slightly lower than the fixing temperature during the standby time, and the temperature is immediately raised to the usable temperature at the time of use, and the use temperature is increased. In many cases, a method is employed in which a user does not wait for the temperature of the fixing roller to rise. In this method, a certain amount of power must be supplied even when the fixing device is not used, thereby consuming extra energy. It is said that the energy consumption during the standby corresponds to about 70% to 80% of the energy consumption of the devices constituting the image forming apparatus.

  Therefore, it has been desired to reduce energy consumption during standby and to further reduce power consumption, and it is required to reduce power supply to zero when not in use. However, if the energy consumption is reduced to zero during standby, the heating roller of the fixing device mainly uses a metal roller such as iron or aluminum and has a large heat capacity, so that the temperature rises to a usable temperature of about 180 ° C. Requires a long heating time of several minutes to several tens of minutes. Such a waiting time deteriorates the usability of the user. Therefore, a heating method that consumes as little power as possible and that quickly rises from the standby state is desired.

  It is clear that it is better to increase the input energy per unit time, that is, the rated power, in order to shorten the heating time of the heating roller. Actually, an image forming apparatus called a high-speed machine having a high print speed is required. In many cases, the power supply voltage is set to 200 V to cope with the problem. However, in general offices in Japan, the commercial power supply is 100 V and 15 A, and it is necessary to perform special work on the power supply-related equipment at the installation location to support 200 V. Not a general solution.

  That is, as long as a commercial power supply of 100 V and 15 A is used, the maximum input energy is determined by the power supply capacity even if the heating roller is heated in a short time. When the temperature becomes low, a voltage lower by a certain level is supplied to the heating roller to delay the lowering of the temperature of the fixing device (for example, see Patent Document 1), or a secondary battery as an auxiliary power supply is charged when the fixing device is in a standby state. Further, when the fixing device is started, power is supplied from a main power supply device and a secondary battery or a primary battery to shorten the start-up time (for example, see Patent Document 2).

  However, the technique disclosed in Patent Document 1 does not provide sufficient power saving because a low voltage is supplied to the fixing device by a certain level even during standby. Further, it is not intended to mainly increase the maximum supply power at the time of startup than the power supplied from the main power supply device. On the other hand, the fixing device disclosed in Patent Literature 2 supplies power from a main power supply device and a secondary battery or a primary battery at the time of start-up. As a secondary power source, a lead storage battery, a nickel-cadmium battery, and a nickel hydrogen battery are generally used. I'm using Such a secondary battery has the property that the capacity deteriorates and decreases when charge and discharge are repeated, and the life is shortened as the discharge is performed with a large current. There is also a phenomenon that the capacity is reduced by the memory effect. Generally, even a battery that is considered to have a long life at a large current has a repetition rate of about 500 to 1000 times. If the repetition of 20 times a day is repeated, the life of the battery is reduced to about one month. Will be. Therefore, the replacement frequency of the battery is increased, which is troublesome, and the running cost such as the cost of replacing the battery is increased. Furthermore, lead-acid batteries use liquid sulfuric acid as an electrolyte, which is not desirable for office equipment.

  In addition, the load on the heating circuit built into the heating roller increases due to sudden current changes and rush power when starting or stopping the supply of large power, and the input current also increases in the peripheral circuits. There is also a problem that noise occurs due to the flow. For this reason, it is not preferable to frequently turn on and off the power supply from the large-capacity auxiliary power supply. Further, if a large amount of electric power is supplied at one time, the supply becomes excessive, and the temperature of the heating circuit may be too high.

  In order to improve such a point and improve the power saving effect, reduce the rush current and the noise due to the rapid current change when supplying large power, shorten the rise time, and prevent the temperature from rising too much. The fixing device can use a chargeable / dischargeable capacitor for the auxiliary power supply, the charger charges the capacitor of the auxiliary power supply with electric power supplied from the main power supply, and the switching device charges and charges the auxiliary power supply. There has been proposed a device that switches the power supply from an auxiliary power supply to an auxiliary heating element and adjusts the amount of power supplied from the auxiliary power supply to the auxiliary heating element (for example, see Patent Document 3).

The device disclosed in Patent Document 3 has a main heater that generates heat by electric power supplied from a commercial power supply, and an auxiliary heater that generates heat by electric power supplied from an auxiliary power supply device using a capacitor, and is an object to be heated. The heating roller of the fixing device can be heated. For the auxiliary power supply device, a chargeable / dischargeable electric double layer capacitor (or capacitor) having a capacitance of about 2000F and a sufficient capacity for supplying power for several seconds to several tens of seconds is used. The power supplied from the auxiliary power supply to the auxiliary heating element is turned on and off at the timing of shutting off the supplied power, for example, to adjust the amount of supplied power.
JP-A-10-10913 JP-A-10-282821 JP-A-2002-184554

  By the way, the basic function of the capacitor is to cause the auxiliary heater to generate heat by the power supplied from the capacitor, to use this heat to shorten the time required for the heating roller to rise to a predetermined temperature, and to prevent the fixing temperature from dropping during paper passing. That is. However, in consideration of the actual use situation, the temperature of the fixing roller and the fixing belt, that is, the time until the fixing temperature decreases, can be expected to some extent, so that the capacitor can be charged during that time. When the paper passing operation is performed at short intervals at short time intervals, the auxiliary heater generates heat each time, and a state occurs in which the capacitance of the capacitor is reduced. That is, since the so-called energy-saving machine has a very small fixing heat capacity, heat is taken away by paper, toner, and a pressing member at the same time as the paper is passed, and the fixing temperature drops sharply. , The auxiliary heater from the capacitor needs to generate heat immediately after the start of paper passing, and there is a problem that the capacity of the capacitor is reduced by repeating a small number of paper passing.

 According to the present invention, even during operation of an image forming apparatus, that is, in a state where an image forming operation is being performed, a good image is always formed in a use state by intermittently charging the capacitor if there is a chargeable state. And that when the machine is stopped due to abnormality detection such as a jam while the image forming apparatus is operating, the capacitor is always charged. An object of the present invention is to provide an image forming apparatus that can solve the above-mentioned conventional problems.

  The invention according to claim 1 provides a main heating unit, a main power supply device for supplying power to the main heating unit, an auxiliary heating unit, and an auxiliary power supply device that includes a power storage unit that supplies power to the auxiliary heating unit for heating and charging. And a heating device having control means for controlling charging and discharging of the auxiliary power supply device, wherein the control means assists when a higher-level device included in the heating device is operating or not operating and can charge the battery. A heating device for charging a battery from a power supply device.

  According to a second aspect of the present invention, in the heating device according to the first aspect, the control unit is configured such that the device including the heating device is operating, the main power supply does not supply power to the main heating unit, and the auxiliary power supply is The battery of the auxiliary power supply is charged when power is not supplied to the auxiliary heating unit.

  According to a third aspect of the present invention, in the heating device according to the first aspect, the control means performs control of charging the battery according to the remaining capacity of the battery when the host device stops operating due to some abnormality. It is characterized by being.

  According to a fourth aspect of the present invention, in the heating device according to the first aspect, when the heating operation of the heating device is stopped, the control means performs control for charging the battery according to the remaining capacity of the battery. .

  According to a fifth aspect of the present invention, in the heating device according to the third or fourth aspect, when the interrupted state of the heating operation or the stopped state is a state in which the heating operation can be returned to the heating operation, the control unit controls the charging according to the remaining capacity. It is characterized by performing control.

  According to a sixth aspect of the present invention, in the heating device of the first to fifth aspects, the storage device of the auxiliary power supply device is a capacitor.

  According to a seventh aspect of the present invention, there is provided a fixing device including the heating device according to any one of the first to sixth aspects, wherein a heating unit is incorporated in the fixing roller.

  According to an eighth aspect of the present invention, there is provided an image forming apparatus having the fixing device according to the seventh aspect, wherein the toner image formed by the electrophotographic method is heated and fused to the recording member to be fixed.

  As described above, the heating device according to the present invention, the fixing device and the image forming device using the same, whether the image forming device is operating or not operating, even if the charging device can be charged intermittently, as described above. By charging the capacitor, it is possible to always form a good image in a use state, and it is possible to prevent a decrease in the capacitance of the capacitor due to repetition of image formation with a small number of sheets passed. .

  Hereinafter, the best mode for carrying out a heating device, a fixing device and an image forming apparatus using the same according to the present invention will be described based on the following embodiments.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the present invention, an image forming apparatus including a heating device and a fixing device which is a higher-order device thereof will be described as an example.
FIG. 1 is a sectional view conceptually showing one embodiment of an image forming apparatus according to the present invention. The image forming apparatus according to the present embodiment mainly includes a reading unit 11 for reading a document, an image forming unit 12 for forming an image, an automatic document feeder (ADF) 13, a document discharge tray 14 for stacking documents fed from the ADF 13, The paper feed unit 19 includes paper feed cassettes 15 to 18 and a paper discharge unit (paper discharge tray 20) for stacking recording paper.

  When the document D is set on the document table 21 of the ADF 13 and an operation is performed on an operation unit (not shown), for example, a print key is pressed, the uppermost document D is sent out in the direction of arrow B1 by the rotation of the pickup roller 22. Then, the document is conveyed onto the contact glass 24 fixed to the image reading unit 11 by the rotation of the document conveying belt 23, and stops there. The image of the document D placed on the contact glass 24 is read by a reading device 25 located between the image forming unit 12 and the contact glass 24. The reading device 25 has a light source 26 for illuminating the document D on the contact glass 24, an optical system 27 for forming a document image, a photoelectric conversion element 28 such as a CCD for forming a document image, and the like. After the image reading is completed, the document D is transported in the direction of arrow B2 by rotation of the document transport belt 23 and discharged onto the document discharge tray 14. In this way, the document D is fed one by one onto the contact glass 24 and the document image is read by the image reading unit 11.

  On the other hand, inside the image forming section 12, a photoreceptor 30 as an image carrier is arranged. The photoreceptor 30 is rotated clockwise in the drawing, and the surface is charged to a predetermined potential by the charging device 31. Further, the writing unit 32 irradiates a laser beam L light-modulated in accordance with image information read by the reading device 25, and exposes the surface of the charged photoconductor 30 with the laser beam L. An electrostatic latent image is formed on the surface of the substrate 30. When the electrostatic latent image passes through the developing device 33, the electrostatic latent image is transferred to the recording medium P fed between the photoconductor 30 and the transfer device 34 by the transfer device 34 opposed thereto. The surface of the photoconductor 30 after the transfer of the toner image is cleaned by the cleaning device 35.

  A plurality of paper cassettes 15 to 18 disposed below the image forming unit 12 accommodate recording media P such as paper, and the recording media P is transferred from any of the paper cassettes 15 to 18 in the direction of arrow B3. The toner image formed on the surface of the photoconductor 30 is transferred to the surface of the recording medium P as described above. Next, the recording medium P is passed through a fixing device 36 in the image forming apparatus as indicated by an arrow B4, and the toner image transferred to the surface of the recording medium P by the action of heat and pressure is fixed. The recording medium P that has passed through the fixing device 36 is conveyed by the discharge roller pair 37, discharged to the discharge tray 20 as indicated by an arrow B5, and stacked.

  FIG. 2 is a sectional view showing an example of the fixing device as described above. The illustrated fixing device 36 includes a fixing roller 40 and a pressure roller 41, and the fixing roller 40 includes the main heating element 2a including a halogen heater and the auxiliary heating element 2b according to the above-described embodiment of the present invention. The heating device 2 is built in, and a nip portion f is formed by the fixing roller 40 and the pressure roller 41 that presses and heats the recording medium P on which the toner image T is placed while passing the recording medium P. Reference numeral 6 in the drawing denotes a fixing separation claw that separates the recording medium P attached to the fixing roller 40. Although not shown, a sensor S for detecting the temperature of the fixing roller 40 is provided in the vicinity. Of course, it may be configured to detect the ambient temperature of the fixing device 36, the temperature of the recording medium P, and the like.

  The recording medium P on which the toner image T transferred to the fixing device 36 is transferred is conveyed between the fixing roller 40 and the pressure roller 41, and the toner image T is heated and melted by the fixing roller 40 heated to a constant temperature. Then, the toner image T is fixed on the recording medium P. Therefore, power is supplied to the main heating element 2a and the auxiliary heating element 2b of the heating device 2 of the fixing roller 40, thereby increasing the temperature of the fixing roller 40 and controlling the power on / off. The toner image T is stably heated and melted by preventing the temperature of the toner image T from becoming too high and maintaining the fixing temperature at a constant temperature or a desired temperature, or by controlling the temperature to show a required temperature change. The toner image T is fixed on the recording medium P.

  FIG. 3 is a circuit diagram showing a configuration of the heating device 2 for the fixing roller 40 and the heating device 1 for supplying electric power thereto. In the figure, 3 is a main power supply as a commercial power supply, 4 is an auxiliary power supply, 5 is a main switch, 6 is a charger, 7 is a switching device, and 8 is control means.

  The heating device 2 includes a main heating element 2a that generates heat by electric power supplied from the main power supply apparatus 3 and an auxiliary heating element 2b that generates heat by electric power supplied from the auxiliary power supply apparatus 4, and heats the fixing roller 40. It has become. Although not shown in detail, the main power supply device 3 is connected to, for example, an outlet or the like so that power is supplied from a commercial power supply at an installation location in the image forming unit 12. And it has functions such as voltage adjustment according to the heating device 2 and rectification of AC and DC, but detailed illustration and explanation are omitted because they are well known.

  The auxiliary power supply device 4 has a chargeable / dischargeable capacitor C as a charger. As the capacitor C, for example, a capacitor having a capacitance of about 80F may be used. However, the capacitor C has a capacitance of about 2000F or more called an electric double layer capacitor, and supplies electric power for several seconds to several tens of seconds. Those having sufficient capacity are suitable. That is, unlike a secondary battery, a capacitor such as an electric double layer capacitor has excellent characteristics because it does not involve a chemical reaction.

  As described above, an auxiliary power supply using a general nickel-cadmium battery as a secondary battery has several hours even when quick charging is performed, but an auxiliary power supply 4 using a capacitor has several minutes. When the standby state and the heating state are repeated within the same time, the auxiliary power supply device 4 using a capacitor can be used to ensure that the power is reliably supplied from the auxiliary power supply device 4 when heating is started. And the heating device 2 can be raised to a predetermined temperature in a short time. Also, the nickel-cadmium battery has an allowable repetition number of charge and discharge of about 500 to 1000 times, and therefore has a short life as an auxiliary power supply for heating, and has a problem of replacement labor and cost. The auxiliary power supply device 4 using a battery has an allowable number of repetitions of charge / discharge of 10,000 or more, has little deterioration due to repetition of charge / discharge, and does not require liquid exchange or replenishment like a lead-acid battery. And can be used stably for a long period of time.

  The electric double layer capacitor has no dielectric substance and utilizes the absorption and desorption reactions (charge and discharge) of the ion adsorption layer of the electric double layer in which charges of ions or solvent molecules formed at the interface between the solid electrode and the solution are concentrated. It has excellent features such as being resistant to repeated charging and discharging, having a long life, requiring no maintenance, being environmentally friendly, and having high charging and discharging efficiency. A large capacity of several Wh / l has also been developed, and the capacity is being further increased.

  The main switch 5 turns on / off the power supplied from the main power supply 3 to the main heating element 2 a. The charger 6 controls the capacitor C of the auxiliary power supply 4 with the power supplied from the main power supply 3. Charge. The switching device 7 switches between charging of the auxiliary power supply device 4 and power supply from the auxiliary power supply device 4 to the auxiliary heating element 2b. The switch 9 turns on / off the power of the capacitor C to / from the auxiliary heating element 2b.

  The control means 8 includes a switching device 7 and a switch 9 and has a CPU 10 for performing control such as turning on / off electric power supplied from the auxiliary power supply device 4 to the auxiliary heating element 2b under predetermined conditions described later. . However, the configuration of the control means 8 shown is merely an example, and various configurations can be adopted. Further, the connection form for controlling the auxiliary power supply device 4 is not limited to the illustrated example. For example, various modes such as a configuration in which the switching device 7 is switched to perform control such as on / off can be adopted.

  The basic operation of the heating device 1 configured as described above will be described. First, in the standby state, the switching device 7 is switched and the switch 9 is turned off, and the charger 6 is connected to the auxiliary power device 4 to charge the capacitor C of the auxiliary power device 4 as shown in FIG. In this state, when heating the heating device 2 with the heating device 1, the main switch 5 is turned on to supply electric power from the main power supply device 3 to the main heating element 2a, and as shown in FIG. With the switch 9 in the connected state, the power is supplied from the auxiliary power supply 4 to the auxiliary heating element 2b by switching, and a large amount of power is supplied to the heating device 2. As described above, when the heating of the heating device 2 is started, a large amount of electric power is supplied from both the main power supply device 3 and the auxiliary power supply device 4 to the heating device 2, so that the heating device 2 is heated to a predetermined temperature in a short time. It can be started up, and the surface temperature of the fixing roller 40 can be quickly raised to a predetermined fixing temperature. Note that the heating device 2 may be configured to include a plurality of auxiliary heating elements.

  When a predetermined period of time has elapsed since the auxiliary power supply 4 supplied electric power to the auxiliary heating element 2 b of the heating device 2 and started heating, the control means 8 supplies the auxiliary heat from the auxiliary power supply 4. The power supplied to the body 2b is cut off to prevent the heating device 2 from overheating and maintain the temperature at a predetermined temperature. The power supplied from the auxiliary power supply device 4 to the auxiliary heating element 2b decreases as time elapses from the start of the supply. In accordance with the amount of reduction in the supplied power, a time period during which the power supplied from the auxiliary power supply 4 to the auxiliary heating element 2b is cut off is determined. When the supplied power is cut off, it is possible to prevent deterioration of each component of the peripheral circuit and electromagnetic noise that occur when the power is cut off while the large power is being supplied.

  When the power supplied from the auxiliary power supply 4 to the auxiliary heating element 2b is cut off, the auxiliary power supply 4 is not fully charged. Therefore, when the temperature of the heating device 2 is stable and relatively little power is consumed, the switching device 7 can be switched to the charger 6 side, the switch 9 is turned off, and the charger 6 is connected to the auxiliary power supply device 4. The auxiliary power supply 4 is charged with the power supplied from the power supply 3. When a large amount of electric power needs to be supplied to the heating device 2 again, the control means 8 can switch the switching device 7 to the auxiliary heating element 2b side, and make the switch 9 conductive so that the main power supply device 3 and the auxiliary power supply device 4 A large amount of energy is supplied to the heating device 2 by supplying electric power.

  Further, the image forming apparatus according to the present invention charges the capacitor even while the apparatus is operating. That is, even when the image forming operation is in operation, when the main power supply does not supply power to the main heating unit and the auxiliary power supply does not supply power to the auxiliary heating unit, the capacitor C of the auxiliary power supply is charged according to the remaining capacity. Control for charging.

  FIG. 4 is a flowchart of the charging operation of the capacitor C as described above. The flow starts with the input of the machine operation signal (step 1), and the remaining capacity of the capacitor C is determined based on the voltage. That is, it is determined whether or not the voltage is equal to or higher than a predetermined voltage A (the voltage A, which is a threshold, may be set to an optimal or desirable value in design) (step 2). The process is terminated without charging (step 3). If the voltage is lower than the predetermined voltage A, it is determined whether the machine is operating normally (step 4). Here, if it is determined that the machine is not operating normally, the control means 8 starts charging control of the capacitor C (step 5), and performs charging until the voltage of the capacitor C becomes equal to or higher than the predetermined voltage A (step 5). Step 6) When the voltage of the capacitor C becomes equal to or higher than the predetermined voltage A, the charging is stopped (Step 7). Even if it is determined in step 4 that the machine is operating normally, if the charging current can be secured to the predetermined value X or more, the process proceeds to steps 5 to 7. If the charging current value is less than the predetermined value X, the process proceeds to step 3, and the process ends without charging the capacitor C.

  In step 1 of this flow, the machine operation signal to be determined is a signal indicating that the image forming apparatus is operating as a machine or that it can be returned to an operation state even if it is stopped for some reason. Can be conditioned as being capable of executing the above-described control flow when the interrupted state or the stopped state of the image forming operation is a state in which the image forming operation can be returned to the image forming operation. Needless to say, a means such as a voltmeter for detecting a voltage or current value is required for the above-described processing. Further, for example, a timer or the like can use the elapsed time after the start of charging in the auxiliary power supply device 4.

  FIG. 5 is a flowchart of the charging operation of the capacitor C as described above. The flow starts with the input of the machine operation signal (step SB1), and it is checked whether or not the image is being formed (step SB2). If the image forming apparatus is not operating, the above-described processing from step SA1 is performed. When the machine is operating, it is determined whether or not power is being supplied from the main power supply 3 to the main heating element 2a (step SB3), and the main power supply 3 is supplying power to the main heating element 2a. If not, the capacitor is not charged (step SB9), and the following judgment is made when the main power supply 3 supplies power to the main heating element 2a. That is, it is determined whether or not power is being supplied from the capacitor C to the auxiliary heating element 2b (step SB4). If power is not being supplied from the capacitor C to the auxiliary heating element 2b, the capacitor C is charged. No (step SB9). When power is being supplied from the capacitor C to the auxiliary heating element 2b, the capacitor C is charged so as to reach the predetermined voltage A while determining the remaining capacity of the capacitor C based on the voltage (steps SB5 and SB6). Then, after the charging process of the capacitor C is completed, the operation of the machine is confirmed (step SB7). If the machine is operating, the operations of steps SB2 to SB6 are repeated.

  Note that the present invention is not limited to the illustrated type of image forming apparatus. For example, the present invention is applicable to various types of apparatuses such as a photoconductor having a belt type instead of a drum shape and a color image forming apparatus using an intermediate transfer belt. Applicable.

1 is a conceptual cross-sectional view illustrating an embodiment of an image forming apparatus according to the present invention. FIG. 2 is a conceptual sectional view illustrating a configuration of a fixing device used in the image forming apparatus of FIG. 1. FIG. 2 is a circuit diagram illustrating a configuration at the time of charging of a heating device used in the image forming apparatus of FIG. 1. FIG. 2 is a circuit diagram illustrating a configuration at the time of discharging of a heating device used in the image forming apparatus of FIG. 1. FIG. 4 is a flowchart illustrating an operation of the heating device when the fixing device is not operating in the embodiment of the present invention. FIG. 4 is a flowchart illustrating an operation of the heating device when the fixing device is moved according to the embodiment of the present invention.

Explanation of reference numerals

DESCRIPTION OF SYMBOLS 1 Heating device 2 Heating part 2a Main heating element 2b Auxiliary heating element 3 Main power supply 4 Auxiliary power supply 5 Main switch 6 Charger 7 Switching device 8 Control means 9 Switch 10 CPU
11 Reading Unit 12 Image Forming Unit 13 Automatic Document Feeder (ADF)
14 Document Discharge Tray 15, 16, 17, 18 Paper Cassette 19 Paper Feeding Unit 20 Discharge Tray 21 Document Plate 25 Reading Device 30 Photoconductor 31 Charging Device 32 Writing Unit 33 Developing Device 34 Transfer Device 35 Cleaning Device 36 Fixing Device 37 discharge roller pair 40 fixing roller 41 pressure roller C capacitor D document P recording medium T toner N nip

Claims (8)

A main heating unit, a main power supply device that supplies power to the main heating unit, an auxiliary heating unit, an auxiliary power supply device that includes a power storage unit that supplies power to the auxiliary heating unit to heat and charge the auxiliary heating unit, and In a heating device provided with control means for controlling charge and discharge,
The heating device, wherein the control unit performs charging of the storage device from the auxiliary power supply device when the host device including the heating device is operating or not operating and the storage device can be charged. The heating device according to claim 1,
The control means, when the host device including the heating device is operating, the main power supply does not supply power to the main heating unit, and when the auxiliary power supply does not supply power to the auxiliary heating unit, the storage device of the auxiliary power supply A heating device characterized by charging. The heating device according to claim 1,
The heating device is characterized in that the control means controls the charging of the power storage device according to the remaining capacity of the power storage device when the host device stops operating due to some abnormality. The heating device according to claim 1,
The heating device is characterized in that the control means controls the charging of the battery according to the remaining capacity of the battery when the host device stops operating. The heating device according to claim 3 or 4,
The image forming apparatus, wherein the control unit performs charging control according to the remaining capacity when the heating operation is stopped or the stopped state is a state in which the heating operation can be returned to the heating operation. The heating device according to any one of claims 1 to 5,
The storage device of the auxiliary power supply device is a capacitor. A fixing device comprising the heating device according to claim 1, wherein the fixing roller has a built-in heating unit. An image forming apparatus comprising the fixing device according to claim 7, wherein the toner image formed by an electrophotographic method is fixed to a recording member by heat welding.

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