JP2007316544A - Fixing device and image forming apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a miniaturizable, low-cost fixing device of high reliability, wherein temperature can rise up in a short time, and to provide an image forming apparatus. <P>SOLUTION: The fixing device includes a fixing roller 34 incorporating a halogen heater 2 and a pressure roller 35 incorporating a halogen heater 1, and toner 37 arranged on a recording medium P is fixed at a nip part between the rollers 34 and 35 by heating and pressing. A power supply to the halogen heater 1 can be performed by both a main power source 6 and a capacitor 7. The power supply to the halogen heater 1 is controlled by a fixation temperature controller 9 and a pressure temperature controller 10 so as to supply the power from one or both of the main power source 6 and the capacitor 7 in accordance with the situation. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a fixing device that fixes an unfixed image formed of a powder particulate image forming substance on a recording medium, and an image forming device such as a copying machine, a printer, a facsimile, and a printing machine having the fixing device.

  In general, in an image forming apparatus such as an electrophotographic copying machine, a printer, and a facsimile, a pressure member (support member) such as a pressure roller, a pressure belt, and a pressure pad is used as a fixing member such as a fixing roller and a fixing belt. A heat-fixing device is used that presses and heats and presses a recording medium such as transfer paper or sheet to pass through between the fixing member and the pressure member to fix the toner as a forming material onto the transfer paper or the like. ing.

  The most commonly used heat-fixing device is that the rotating fixing roller is heated from the inner surface by a radiant heater and pressed against the fixing member to carry the sheet while performing the heat treatment and pressure treatment necessary for fixing. It is a method of performing.

  In recent years, in view of environmental problems, in order to reduce the power consumption of an image forming apparatus such as a copying machine or a printer device, power saving of a fixing device that fixes toner on a recording medium is required. Specifically, the heat capacity of the fixing member and the pressure member has been lowered so that the temperature can be raised in a short time during use without preheating during standby, so that the desired temperature can be obtained. Further, as in Patent Document 1, Patent Document 2, and Patent Document 3, a power storage device that stores energy from the commercial power supply when not in use is provided separately from the normal commercial power supply, and a system different from the commercial power supply when used As an example, the auxiliary heating means provided on the fixing member and the pressure member is driven using the electric power from the power storage device, and the temperature rise time is shortened by applying more electric power than can be supplied by the commercial power source for a predetermined time. A fixing device has been proposed.

  That is, in Patent Document 1, the heating unit is provided with a main heating element and an auxiliary heating element, the resistance value of the auxiliary heating element is made different from the resistance value of the main heating element, and the auxiliary heating element has a current supplied to the main heating element. By supplying different currents and appropriately setting the current flowing through the auxiliary heating element, the power supplied to the heating unit is optimized, and when heating the heating unit, the temperature is raised to a predetermined temperature in a short time Is described.

  In Patent Document 2, there are two heat sources that generate heat when energized, a fixing member or a heating member that is heated by the heat source, and a power source that is higher than the output power of a normal commercial power source stored during standby. A power storage device that drives at least one predetermined time and a charging device that charges the power storage device with electric power from a commercial power source, and a heat source is driven by the power storage device and the commercial power source simultaneously or at different timings. Are listed.

  In Patent Document 3, a driving unit that supplies electric power to a heat source includes a power storage device capable of rapid charging / discharging and a charger that is supplied with power from a commercial power source and charges the power storage device, and the heat source is driven during normal operation. A relay that has at least a first heater and a second heater that has a larger output than the first heater and that is driven only when rising or when the temperature drops; And having a circuit that switches from energization of the second heater to energization of the first heater by the operation of this relay.

In addition, since the fixing member has a low heat capacity for shortening the temperature rising time, if the sheet is passed immediately after the fixing member is heated during high-speed printing, thermal energy is applied to the paper and the pressure member that has not been sufficiently applied. In some cases, the temperature of the fixing member is lowered to cause fixing failure. In order to prevent such a situation, it has been proposed that temperature drop is prevented by controlling so that the power from the power storage device is supplied to the auxiliary heating means immediately after the paper is passed. That is, in Patent Document 4, a heating unit is provided with a main heating element and an auxiliary heating element, power is supplied from the main power supply to the main heating element, and power is supplied from the auxiliary power supply using a capacitor to the auxiliary heating element. And the control means starts power supply from the capacitor of the auxiliary power supply device to the auxiliary heating element immediately before or after the heating target passes through the heating part by the heated object, and the temperature decrease of the heating part is large. It describes what is controlled so that it does not become.
JP 2004-95525 A JP 2002-174988 A JP 2003-295659 A JP 2004-319431 A

  However, in each of the above-described technologies, it is necessary to use an auxiliary heater for driving with a power storage device in addition to a main heater driven with a commercial power supply, which requires a plurality of heaters, which increases costs and reduces reliability. Cause problems. In addition, it is effective to reduce the size of the roller when reducing the heat capacity, but it is difficult to reduce the size of the roller in order to arrange a plurality of heaters. It is also conceivable to increase the heating energy on the fixing member side, which is the contact surface side with the toner, and raise the temperature of the fixing member in a short time, but the temperature on the pressure member side is lower than the fixing member temperature. When the paper is passed through the nip portion, there is a problem that a temperature gradient is generated in the thickness direction of the toner layer and a hot offset that causes the toner layer to be divided is likely to occur.

  SUMMARY An advantage of some aspects of the invention is that it provides a fixing device and an image forming apparatus that can be heated in a short time, can be downsized, are low in cost, and have high reliability. And

  The invention of claim 1 includes at least a pair of a fixing member and a supporting member constituting the nip portion, and fixes the image forming substance disposed on the recording medium by pressing while heating in the nip portion. In addition, in the fixing device using both the commercial power source and the power storage device for the heating, the support member is provided with a single heating source, and the heating source is used as a power source so that the power storage device and the commercial power source can be switched simultaneously or simultaneously. The fixing device is configured so as to be able to perform.

  According to a second aspect of the present invention, in the fixing device according to the first aspect, the heating source disposed on the indicating member is a first heating source, the second heating source is disposed on the fixing member, and the first and A control device that controls power supply to the second heating source, wherein the control device supplies power from a commercial power source to the second heating source at startup and power from the power storage device to the first heating source; It is characterized by supplying.

  According to a third aspect of the present invention, in the fixing device according to the first or second aspect, the control device supplies electric power from a commercial power source to the second heating source after a predetermined time has elapsed from the time of startup, and the first heating source. Is characterized in that power is supplied from a commercial power source.

  According to a fourth aspect of the present invention, in the fixing device according to any one of the first to third aspects, the output voltage of the power storage device is configured to be substantially the same as the voltage of the commercial power supply.

  According to a fifth aspect of the present invention, in the fixing device of the fourth aspect, the output voltage of the power storage device is substantially the same as the voltage of the commercial power source.

  According to a sixth aspect of the present invention, in the fixing device according to the fourth aspect, the commercial power supply is provided with a step-down unit that makes the output voltage substantially the same as that of the power storage device.

  According to a seventh aspect of the present invention, in the fixing device according to any one of the first to sixth aspects, the power storage device is an electric double layer capacitor.

  According to an eighth aspect of the present invention, in the fixing device according to any one of the first to seventh aspects, the fixing member is a fixing roller or a fixing belt.

  According to a ninth aspect of the present invention, in the fixing device according to any one of the first to eighth aspects, the support member is a pressure roller, a pressure belt, or a pressure pad.

  According to a tenth aspect of the present invention, in the fixing device according to any one of the first to ninth aspects, the heating source is an electric heater, a halogen heater, or an IH heater.

  An eleventh aspect of the invention is an image forming apparatus comprising the fixing device according to any one of the first to tenth aspects.

According to the fixing device and the image forming apparatus of the present invention, since the heat source provided in the support member is one, the power from the commercial power and the power from the power storage device are switched and applied to the heat source. The temperature of the apparatus and the image forming apparatus can be increased in a short time, the size can be reduced, the cost can be reduced, and high reliability can be achieved.

Embodiments as the best mode for carrying out the present invention will be described below with reference to the drawings.

  Hereinafter, embodiments of a fixing device, a fixing method, and an image forming apparatus according to the present invention will be described with reference to the drawings.

  FIG. 1 is a schematic cross-sectional view showing a configuration of an image forming apparatus according to the embodiment, FIG. 2 is a main part configuration diagram of the image forming apparatus according to the first embodiment, and FIG. 3 is a diagram of a fixing device according to the first embodiment. FIG. 4 is a circuit diagram showing the configuration of the fixing device in the first embodiment, and FIG. 6 is a schematic diagram showing the temperature distribution of toner and paper in the nip portion.

  As shown in FIG. 1, the image forming apparatus according to the present embodiment includes an image reading apparatus 101 that reads a document, an image forming apparatus 102 that forms an image, an automatic document feeder (ADF) 103, and an automatic document. A document discharge tray 114 for stacking documents sent out from the conveying device 103, a sheet feed unit 119 including sheet cassettes 115 to 118, and a sheet discharge tray 120 for stacking recording sheets are included.

  When reading an original without using the automatic document feeder 103, the automatic document feeder 103 is opened at a hinge portion that indicates one end of the automatic document feeder 103, and is arranged between the document pressure plate of the automatic document feeder 103 and the contact glass 124. The image of the original D thus read is read by the image reading device 101 located between the image forming apparatus 102 and the contact glass 124.

  In the image reading apparatus according to this example, the size determination of the document in the main scanning direction is performed based on the image data read by the image reading CCD image sensor, and the size determination in the sub-scanning direction is performed by the output of the document presence / absence detection sensor. The document size is detected based on these results.

  The image reading apparatus 101 includes a light source 112 that illuminates an original D on a contact glass 124, a reflecting mirror group 110 that deflects the direction of reflected light, a lens 108 that forms an original image, a CCD that forms an original image, and the like. A photoelectric conversion element 109 and the like are included. In this example, after the image reading is completed, the document D is conveyed in the arrow B2 direction and discharged onto the document discharge tray 114.

  On the other hand, inside the image forming apparatus 102, as shown in FIGS. 1 and 2, a photosensitive member 21 as an image carrier is disposed. The photosensitive member 21 is rotated in the clockwise direction in both drawings, and the surface is charged to a predetermined potential by the charging device 22. Further, the writing unit 130 irradiates a laser beam 23 light-modulated according to image information read by the image reading device 101 from the laser 131, changes the direction by the mirror 24, and the charged surface of the photosensitive member 21 is applied to the surface. Exposure with laser light 23 forms an electrostatic latent image on the surface of the photoreceptor 21. When the electrostatic latent image passes through the developing device 25, the electrostatic latent image is transferred to the recording medium P fed between the photosensitive member 21 and the transfer device 26 by the opposing transfer device 26. The surface of the photoconductor 21 after the toner image is transferred is cleaned by a cleaning device 27 provided with a cleaning blade 27a.

  A plurality of paper feed cassettes 115 to 118 arranged at the lower part of the image forming apparatus 102 contain recording media P such as paper, and the recording media P is fed from any of the paper feed cassettes 115 to 118 in the direction of arrow B3. The toner image formed on the surface of the photoreceptor 21 as described above is transferred onto the surface of the recording medium P. Next, the recording medium P is passed through the fixing device 29 in the image forming apparatus 102 as indicated by an arrow B4, and the toner image transferred onto 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 29 is conveyed by the discharge roller pair 137, discharged to the discharge tray 120 as indicated by an arrow B5, and stacked.

  FIG. 3 is a schematic configuration diagram of the fixing device 29 of the present invention. The fixing device 29 is provided with a fixing roller 34 as a fixing member, and a pressure roller 35 as a supporting member, which is provided so as to form a nip portion with the fixing roller 34. The pressure roller 35 presses the fixing roller 34 with a constant pressure. The fixing roller 34 and the pressure roller 35 have a three-layer structure, and a silicon rubber layer is provided as an elastic layer on a core metal of Fe or Al. Further, a Teflon (registered) such as PFA or PTFE is used as a release layer on the surface layer. Trademark) resin layer is provided.

  In this example, a halogen heater is used as a heating element that generates heat when power is supplied. The halogen roller 2 is incorporated in the fixing roller 34 and the halogen heater 1 is incorporated in the pressure roller 35. The fixing roller 34 and the pressure roller 35 are rotationally driven at a predetermined speed by a driving mechanism (not shown). Further, the surface temperature of the fixing roller 34 and the pressure roller 35 is detected by a temperature sensor (not shown), and the temperature is controlled to a predetermined temperature by the fixing temperature control device 9 and the pressure temperature control device 10 constituting the control device. Is done.

FIG. 4 shows a circuit configuration of the fixing device according to the first embodiment of the present invention. In this example, the main power supply 6 is a commercial power supply (for example, single-phase 100 volts), is connected to the halogen heater 2 via the fixing temperature control device 9, and is based on the temperature of the fixing roller 34 by a temperature sensor (not shown). The supplied power is turned on / off to be controlled at a predetermined temperature.

  Further, the main power supply 6 is connected to a charger 8 having an AC-DC conversion function (A / D conversion) and the halogen heater 1. Between the main power supply 6 and the charger 8, there is provided a changeover switch 11 for switching power supply to the halogen heater 1. The charger 8 is connected to the power storage device 7 and includes a charge / discharge switch 12 for switching between charge and discharge. The charge / discharge switch 12 is connected to the power storage device 7 and is switched between the charger 8 side and the halogen heater 1 side under the control of the pressurized temperature control device 10. The changeover switch 11 and the charge / discharge switch 12 are connected to the pressurizing temperature control device 10 to control the power supply to the halogen heater 1.

  In this example, the power storage device 7 is composed of a chargeable / dischargeable capacitor, and has an electrostatic capacity of about 2000 F, such as an electric double layer capacitor, for example, and has a capacity sufficient for power supply for several seconds to several tens of seconds. Use what you have. An electric double layer capacitor has a large capacitance, and unlike a secondary battery, it does not involve a scientific reaction, so it can be charged quickly and has a long life with little deterioration during repeated charging and discharging. Also, unlike lead-acid batteries, there is no need for liquid replacement or replenishment, so that almost no maintenance is required and the battery can be used stably for a long time.

  Next, the operation of the fixing device 29 according to this example will be described. The fixing device 29 according to this example is controlled as shown in the table shown in FIG. That is, in the fixing device 29 according to this example, the switch 11 is switched to the charger 8 side and the charge / discharge switch 12 is switched to the charger 8 side during standby, and the power supplied from the main power supply 6 passes through the charger 8. , Converted from AC to DC, transformed, and stored in the power storage device 7. In this state, electric power is not supplied to the halogen heater 2 and the halogen heater 1.

  When the fixing device is activated, the changeover switch 11 is switched to the charger 8 side and the charge / discharge switch 12 is switched to the halogen heater 1 side under the control of the pressurization temperature control device 10. By this operation, electric power is supplied from the main power source 6 to the halogen heater 2, and electric power is supplied so that the fixing roller 34 reaches a predetermined temperature. In addition, electric power is supplied to the halogen heater 1 from the power storage device 7, and the pressure roller 35 is heated for a predetermined time.

  At this time, since the power from the main power source 6 is not supplied to the halogen heater 1, the power from the main power source 6 is supplied only to the halogen heater 2 and the fixing roller 34 is heated in a short time by the halogen heater 2.

  In this example, after starting, the halogen heater 2 of the fixing roller 34 is supplied with power from the main power supply 6, while the halogen heater 1 of the pressure roller 35 is supplied with power from the power storage device 7. Here, the capacity of the electric power stored in the power storage device 7 is set based on a time until the temperature of the fixing roller 34 can be maintained at a predetermined temperature for a predetermined time. The fixing roller 34 has a predetermined temperature and a predetermined time. Then, the charging / discharging switch 12 is switched to the charger 8 side, and the power storage device 7 is charged from the charger 8. Simultaneously with the above switching, the changeover switch 11 is switched to the halogen heater 1 side, and the electric power from the main power supply 6 is supplied to the halogen heater 1. Then, the power from the main power supply 6 supplied to the halogen heater 1 is controlled by the pressure temperature control device 10 so that the surface temperature of the pressure roller 35 becomes a predetermined temperature by a temperature sensor (not shown).

  In this example, the sheet feeding is started at the same time as the fixing roller 34 and the pressure roller 35 reach a predetermined temperature. This paper passing may be performed even before the predetermined time has elapsed. For this reason, when the paper is passed, the halogen heater 1 of the pressure roller 35 is heated only by the electric power from the power storage device 7 and after the fixing roller 34 is in a predetermined state after that, only from the main power supply 6. There are cases where both of the electric power is supplied. Since the switching between the two is performed in an instant, electric power is continuously supplied to the halogen heater 1 of the pressure roller 35, and the temperature raising time can be shortened.

  Further, in this example, since it is not necessary to prepare the heating element for the power storage device and the heating element for the main power source in the pressure roller 35, the size of the pressure roller 35 itself can be reduced and the reliability can be improved. Furthermore, since the pressure roller 35 is heated to a predetermined temperature in a sufficiently short time and starts passing, abnormal images such as hot offset and uneven gloss can be prevented. In addition, by using the power storage device, it is possible to supply more power than temporarily supplied from the power source, and it is possible to improve the temperature rising rate and prevent temperature drop.

Further, in this example, the occurrence of hot offset and gloss unevenness can be prevented for the following reason. FIG. 6 is an enlarged view of the nip portion and a graph showing the temperature with respect to the distance from the surface of the fixing roller to the pressure roller surface in the nip portion. Toner 37 and when the temperature of the interface xt paper 36 is to be fixed at T _0, the temperature of the fixing roller 34 to obtain a T ₀ in the case as low a temperature T _s1 of the pressure roller 35 T _t1 It is necessary to. However, by raising the temperature of the pressure roller 35 to T _s2 , the temperature of the fixing roller 34 for obtaining T ₀ becomes T _t2 , and the fixing roller 34 can be set to a low temperature. As described above, since the temperature at the interface between the fixing roller 34 and the toner 37 can be set low, problems such as hot offset and uneven gloss can be solved.

  Furthermore, according to this example, one heating source for heating the pressure roller is provided, and this heating source can be heated by the main power source and the charger. For this reason, a plurality of heating sources are not used, and space saving and cost reduction can be achieved.

  Next, a modification of this example will be described. In the following modifications, the heating control of the halogen heater 1 and the halogen heater 2 is performed in the same manner as in the above-described example. In the first modification, as shown in FIG. 7, the fixing unit includes a fixing roller 38, a fixing belt 39, and a heating roller 40. In this example, the halogen heater 2 is disposed in the heating roller 40. That is, in this example, a fixing belt 39 stretched between the fixing roller 38 and the heating roller 40 is provided, and a pressure roller 35 that forms a nip opposite to the fixing roller 38 is provided. The fixing belt 39 is composed of three layers, and is provided with a polyimide resin as a base material, silicon rubber as an elastic layer, and a PFA or PTFE layer as a release layer on the surface layer. The heating roller 40 is made of a material such as Fe, Al, or Ni, and a halogen heater 2 made of a halogen heater is provided inside. The pressure roller 35 is provided with the halogen heater 1 and heats the fixing belt 39 and the pressure roller 35 while being rotationally driven by a driving mechanism (not shown). Further, the surface temperature of the fixing belt 39 and the pressure roller 35 is detected by a temperature sensor (not shown), and is controlled to a predetermined temperature by the fixing temperature control device 9 and the pressure temperature control device 10, respectively. By using the fixing belt 39, the heat capacity can be reduced.

  In the second modification, as shown in FIG. 8, the heating roller 40 is heated by the IH coil 4. That is, in this example, the IH coil 4 is provided in the vicinity of the heating roller 40 as a heat source, and the heating roller 40 itself is configured to generate induction heat. Since heat is generated on the surface of the heating roller 40, the temperature of the fixing belt can be increased in a shorter time.

  Further, the power storage device 7 has substantially the same configuration as that of the first embodiment described above, and the voltage applied to the halogen heater 1 for heating the pressure roller 35 is substantially equal to the voltage of the main power supply 6 and the voltage of the power storage device 7. Can be connected in series. For example, if the commercial power supply is 100V, a plurality of electric double layer capacitors are connected in series so that the output voltage of the electric double layer capacitor is about 100V. By doing so, even when the standard voltage of the halogen heater 1 is 100V, the voltage of the main power source 6 and the power storage device 7 is 100V, respectively, so that heating can be performed without reducing the heat generation efficiency.

  Next, a third embodiment of the present invention will be described. In this example, the power input to the halogen heater 1 from the main power supply 6 is converted into a direct current by the charger 8. The control circuit of the fixing device is changed from that of the first embodiment. FIG. 9 is a circuit diagram showing the configuration of the fixing device in the third embodiment, and FIG. 10 is a table showing the operating state of the fixing device in the third embodiment. The main power supply 6 is a commercial power supply and is connected to the halogen heater 2 or the IH coil via the fixing temperature control device 9 and is supplied based on the temperature of the fixing roller 34 or the fixing belt 39 by a temperature sensor (not shown). The electric power is turned on / off to be controlled to a predetermined temperature.

  Further, the main power supply 6 is also connected to a charger 8 having an AC-DC conversion function (A / D conversion). The charger 8 is connected to the power storage device 7 and the halogen heater 1, and a changeover switch 13 is provided between them to switch the connection and control power supply. The changeover switch 13 switches the output of the charger 8 to the power storage device 7 or the halogen heater 1. Further, a charge / discharge switch 12 for turning on / off the connection is provided between the power storage device 7 and the halogen heater 1. The changeover switch 13 and the charge / discharge switch 12 are connected to the pressurizing temperature control device 10 and control the power supplied to the halogen heater 1. The power storage device 7 is configured by a chargeable / dischargeable electric double layer capacitor.

  Next, the operation of the fixing device according to this example will be described. As shown in FIG. 10, during standby, the power supplied from the main power supply 6 is converted from AC to DC via the charger 8, transformed, and stored in the power storage device 7. After the power storage device 7 is fully charged, the changeover switch 13 is controlled to the open state. Further, the charging / discharging switch 12 is controlled to be open during charging.

  When starting up the fixing device, the fixing temperature control device 9 operates to supply power from the main power source 6 to the halogen heater 2, and power is supplied so that the fixing roller 34 has a predetermined temperature. 7 and 8 is also substantially the same. In the case of FIG. 8, the IH coil 4 is driven instead of the halogen heater 2.

  In this example, the changeover switch 13 is switched from the power storage device 7 to the halogen heater 1 side at the same time as the activation, and electric power is supplied to the halogen heater 1. At this time, since the changeover switch 13 is controlled so that the power from the main power source 6 is not supplied to the halogen heater 1, the power from the main power source 6 can be concentrated on the halogen heater 2 and can be increased in a short time. Temperature becomes possible.

  In addition, the changeover switch 13 is switched to the power storage device 7 side, and the charge / discharge switch 12 is connected, so that the electric power from the power storage device 7 is supplied to the halogen heater 1.

  The capacity stored in the power storage device 7 is set based on the time until the temperature of the fixing roller 34 (or the fixing belt 39) can be maintained at a predetermined temperature for a predetermined time, and the fixing roller 34 (or the fixing belt 39). Is reached at a predetermined temperature for a predetermined time, the discharge changeover switch 13 is switched to the power storage device 7 side, and the supply of electric power from the charger 8 to the halogen heater 1 is stopped. As a result of this switching, electric power from the charger 8 is supplied to the halogen heater 1, and direct current from the main power supply 6 through the charger 8 is adjusted so that the surface temperature of the pressure roller 35 becomes a predetermined temperature by a temperature sensor (not shown). The converted electric power is on / off controlled by the pressurized temperature control device 10.

  When the fixing roller 34 (or the fixing belt 39) and the pressure roller 35 reach a predetermined temperature, paper feeding is started. The pressure roller 35 is initially heated by the electric power from the power storage device 7, and the fixing roller 34 is in a predetermined state. At the same time, the main power supply 6 is supplied with electric power converted into direct current via the charger 8. In addition, since the electric power can be supplied, the temperature raising time can be shortened. Further, since it is not necessary to prepare two halogen heaters for the power storage device and main power supply, the size of the pressure roller 35 itself can be reduced. Furthermore, since the pressure roller 35 is heated to a predetermined temperature in a sufficiently short time and starts passing, abnormal images such as hot offset and uneven gloss can be prevented.

  Further, since the voltage applied from the charger 8 to the halogen heater 1 that heats the pressure roller 35 and the power storage device 7 can be made substantially the same voltage and can be limited to direct current, the standard voltage of the halogen heater 1 is, for example, 45V. The heating can be performed without reducing the heat generation efficiency. Compared to the case of claim 2, it can be limited to a DC voltage, and can be configured without connecting in series a number of capacitors equivalent to 100 V of a commercial power supply, and can be downsized.

  Note that the fixing device according to the present invention may be performed in any manner without being limited to the above-described control pattern as long as the heat source of the pressurizing unit can be driven by both the commercial power source and the power storage device.

1 is a schematic cross-sectional view illustrating a configuration of an image forming apparatus according to a first embodiment. 1 is a main part configuration diagram of an image forming apparatus according to a first embodiment; 1 is a cross-sectional view illustrating a configuration of a fixing device according to a first embodiment. FIG. 2 is a circuit diagram illustrating a configuration of a fixing device according to a first embodiment. 3 is a table showing the operating state of the fixing device in the first embodiment. FIG. 6 is a schematic diagram illustrating a temperature distribution of toner and paper in a nip portion according to the first embodiment. FIG. 3 is a schematic configuration diagram of another fixing device in the first embodiment. FIG. 3 is a schematic configuration diagram of another fixing device in the first embodiment. FIG. 10 is a circuit diagram illustrating a configuration of a fixing device according to a third embodiment. 10 is a table showing an operating state of a fixing device in a third embodiment.

Explanation of symbols

1: Halogen heater 2: Halogen heater 4: IH coil 6: Main power supply 7: Power storage device 8: Charger 9: Fixing temperature control device 10: Pressurizing temperature control device 11: Changeover switch 12: Charge / discharge switch 13: Changeover switch 20: image forming device 21: photoconductor 22: charging device 23: laser beam 24: mirror 25: developing device 25a: developing roller 26: transfer device 27: cleaning device 27a: cleaning blade 28: paper feeding device 29: fixing device 30 : Paper feed tray 31: paper feed roller 32: recording paper transport path 33: registration roller pair 34: fixing roller 35: pressure roller 36: paper 37: toner 38: fixing roller 39: fixing belt 40: heating roller 101: image Reading apparatus 102: Image forming apparatus 103: Automatic document feeder 108: Lens 109: Photoelectric conversion element 110: Reflective mirror group 112 Source 114: original discharge tray 115 to 118: the paper feed cassette 119: paper feed unit 120: discharge tray 124: contact glass 130: Unit 131: Laser 137: discharge roller pair

Claims (11)

At least a pair of a fixing member and a support member constituting the nip portion are provided, and the image forming substance disposed on the recording medium is pressed and fixed on the recording medium while being heated in the nip portion. In the fixing device that uses both the battery and the power storage device,
One fixing source is disposed on the support member, and the heating source is configured so that a power storage device and a commercial power source can be used simultaneously or switchably as a power source. A control device that controls the power supply to the first and second heating sources while the heating source disposed on the indicating member is a first heating source, the second heating source is disposed on the fixing member. Prepared,
2. The fixing device according to claim 1, wherein the control device supplies power from a commercial power source to the second heating source and supplies power from the power storage device to the first heating source at the time of startup. The said control apparatus supplies electric power from a commercial power source to the said 2nd heating source after predetermined time passes since starting, and supplies electric power from a commercial power source to the said 1st heating source. Or the fixing device of 2. The fixing device according to claim 1, wherein an output voltage of the power storage device is configured to be substantially the same as a voltage of the commercial power source. The fixing device according to claim 4, wherein an output voltage of the power storage device is substantially the same as a voltage of the commercial power source. The fixing device according to claim 4, wherein the commercial power source includes a step-down unit that makes the output voltage substantially the same as that of the power storage device. The fixing device according to claim 1, wherein the power storage device is an electric double layer capacitor. The fixing device according to claim 1, wherein the fixing member is a fixing roller or a fixing belt. 9. The fixing device according to claim 1, wherein the support member is a pressure roller, a pressure belt, or a pressure pad. The fixing device according to claim 1, wherein the heating source is an electric heater, a halogen heater, or an IH heater. An image forming apparatus comprising the fixing device according to claim 1.