JP5402743B2 - Fixing apparatus and image forming apparatus - Google Patents

Description

  The present invention relates to a fixing device and an image forming apparatus.

In the fixing device, the fixing roller is brought into contact with both the fixing surface and the non-fixing surface of the conveyed paper substantially simultaneously to heat and pressurize the paper. As a result, the toner image formed on the fixing surface is fixed on the sheet. “Fixing surface” refers to a surface of a sheet on which a toner image is fixed upon fixing. Further, the “non-fixing surface” refers to the surface opposite to the “fixing surface” of both sides of the sheet.
Conventionally, when the fixing roller comes into contact with the fixing surface of the paper, a part of the toner may be fused to the fixing roller and the paper may stick to the fixing roller. At this time, there is a problem that paper jam occurs.

  Therefore, in the nip area where the paper and the fixing roller are in contact with each other, by blowing air to the fixing surface of the paper that has passed through the fixing roller, the paper stuck to the fixing roller is separated from the fixing roller to prevent paper jamming. There is a fixing device or an image forming apparatus that can be obtained (see Patent Document 1).

JP 2007-219430 A

  However, in the fixing device or the image forming apparatus described in Patent Document 1, the temperature inside the fixing roller or the fixing device decreases due to the influence of the blown wind because the outside air is taken in and blown onto the fixing surface of the paper. Fixing performance decreases. If the fixing roller is excessively heated in order to prevent the fixing performance from deteriorating, a new problem of increasing power consumption arises. In addition, if a configuration in which a heat source is provided and the outside air is blown after the outside air is blown, deterioration in fixing performance can be prevented, but there is still a problem of increasing power consumption. Since it leads also to a temperature rise, it is not preferable.

  An object of the present invention is to provide a fixing device and an image forming apparatus capable of maintaining fixing performance while avoiding an increase in power consumption and an increase in the temperature of the entire apparatus in a configuration that can prevent paper jam by blowing air on the fixing surface of the paper. Is to provide a device.

According to the present invention, when one of the front and back surfaces of the paper on which the toner image is fixed during fixing is a fixing surface and the other is a non-fixing surface, the toner image is obtained by heating and pressing both the fixing surface and the non-fixing surface. In the fixing device that fixes the toner to the fixing surface of the paper,
A first fixing roller for heating and pressing the fixing surface of the paper;
A second fixing roller for heating and pressing the non-fixing surface of the paper;
An air intake section that sucks in air whose temperature has been increased by heat treatment during fixing operation;
A transport section for transporting air sucked by the intake section;
A blower unit that blows air conveyed by the conveyance unit onto the fixing surface of the paper;
A control unit for controlling the air sucked by the air intake unit to be exhausted by the air blowing unit by operating the air blowing unit after operating the air intake unit;
Is provided.

Further, according to the present invention, when one of the front and back surfaces of the paper on which the toner image is fixed during fixing is a fixing surface and the other is a non-fixing surface, both the fixing surface and the non-fixing surface are heated and pressed. In an image forming apparatus including a fixing device for fixing a toner image on a fixing surface of a sheet,
A first fixing roller for heating and pressing the fixing surface of the paper;
A second fixing roller for heating and pressing the non-fixing surface of the paper;
An air intake section that sucks in air whose temperature has been increased by heat treatment during fixing operation;
A transport section for transporting air sucked by the intake section;
A blower unit that blows air conveyed by the conveyance unit onto the fixing surface of the paper;
A control unit for controlling the air sucked by the air intake unit to be exhausted by the air blowing unit by operating the air blowing unit after operating the air intake unit;
An image forming apparatus is provided.

  According to the present invention, it is possible to maintain the fixing performance while avoiding an increase in power consumption and an increase in the temperature of the entire apparatus in a configuration that can prevent paper jam by blowing air on the fixing surface of the paper.

1 is a schematic configuration diagram of an image forming apparatus. 1 is a schematic configuration diagram of a fixing device. It is a figure which shows the entrance side of a nip area | region. It is a figure which shows the paper discharge side of a nip area | region. It is a flowchart which shows a ventilation process. It is a figure which shows an experimental result.

  The configuration and operation of the image forming apparatus in this embodiment will be described in detail with reference to the drawings. In addition, this embodiment is an example and this invention is not limited to this. For example, in the present embodiment, a monochrome image forming apparatus has been described as an example. However, the present invention can also be implemented by a color image forming apparatus.

FIG. 1 shows a schematic configuration of the image forming apparatus 10.
The image forming apparatus 10 includes an automatic document feeder 20, a scanner unit 30, an image forming unit 40, a paper feeding unit 50, and the like.

The automatic document conveyance unit 20 conveys the document D placed on the document placement tray one by one to a predetermined conveyance path.
The scanner unit 30 irradiates the conveyed document D with a light source and receives reflected light reflected from the document D. The scanner unit 30 converts the received optical signal into an electrical signal (image data), and outputs the converted image data to the image forming unit 40.

  The image forming unit 40 forms a toner image on the photosensitive drum 41 based on the image data, and performs a series of image forming operations until the formed toner image is transferred to the paper P and fixed.

The configuration and operation around the photosensitive drum 41 will be briefly described.
The charging device 42 uniformly charges the surface of the photosensitive drum 41.
The exposure device 43 exposes a non-image area of the photosensitive drum 41 and forms an electrostatic latent image in the image area by removing the charge in the exposed portion.
The developing device 44 develops the toner image by attaching toner to the electrostatic latent image.
The transfer device 45 applies a charge having a polarity opposite to that of the toner from the back surface of the paper P, and transfers the toner image attached to the photosensitive drum 41 to the surface of the paper P by electrostatic force.

The separation device 46 adds a charge having a polarity opposite to that at the time of transfer from the back surface of the paper P, and separates the paper P and the photosensitive drum 41.
The separation claw 47 contacts the surface of the photosensitive drum 41 to separate the paper P and the photosensitive drum 41 when the paper P and the photosensitive drum 41 are not separated even after the separation processing by the separation device 46. The cleaning device 48 removes residual toner adhering to the photosensitive drum 41 without being transferred to the paper P with a brush or a blade.

  The fixing device 49 heats and presses the conveyed paper P from both sides to fix the toner image formed on the surface of the paper P.

  In the following description, the surface of the paper P on which the toner image is fixed is referred to as “fixing surface”, and the back surface of the paper P on which the toner image is not fixed is referred to as “non-fixing surface”. In the case of double-sided printing, the toner image is fixed on both sides of the paper P. In this case, the determination is based on the fixing time. In other words, in both duplex printing and simplex printing, a surface on which a toner image is fixed at the time of fixing is a fixing surface, and a surface on which the toner image is not fixed at the time of fixing is a non-fixing surface.

  The paper feeding unit 50 stores a plurality of types of paper P in a tray, and feeds the paper P to the image forming unit 40 via a predetermined conveyance path.

  The control unit 1 includes a CPU, a RAM, a ROM, and the like. The CPU expands various programs stored in the ROM to the RAM, and comprehensively controls the operation of the image forming apparatus 10 in cooperation with the expanded various programs. In the present embodiment, the control of the fixing device 49 will be described in particular.

FIG. 2 shows a schematic configuration of the fixing device 49.
The fixing device 49 includes a heating roller 491, a first fixing roller 492, a second fixing roller 493, a fixing belt 494, a first intake fan 495, a second intake fan 496, a third intake fan 497, and a fourth. The intake fan 498, the separation fan 499, and the like are included.

  The heating roller 491 is a roller having a diameter = 52 mm, a core metal material = aluminum, a core metal thickness = 3.0 mm, and a surface material = PTFE, and includes a high output heater therein. The heating roller 491 rotates in the forward direction with respect to the conveyance direction of the paper P and heats the first fixing roller 492 via the fixing belt 494.

  The first fixing roller 492 is a roller having a diameter = 40 mm, a core metal material = SUS, a core metal diameter = 25 mm, a core metal thickness = solid, a rubber layer thickness = 7.5 mm, and a rubber layer hardness = JIS-A 10 °. is there. The first fixing roller 492 rotates in the forward direction with respect to the transport direction of the paper P, and heats or presses the fixing surface of the transported paper P.

  The second fixing roller 493 is a roller having a diameter = 50 mm, a core metal material = aluminum, a core metal thickness = 3.0 mm, a rubber layer thickness = 2.0 mm, a rubber layer hardness = JIS-A 10 °, and a surface layer material = PFA. Yes, with a high-power heater inside. The second fixing roller 493 rotates in the forward direction with respect to the transport direction of the paper P, and heats or presses the non-fixing surface of the transported paper P.

  The fixing belt 494 is a belt having a diameter = 80 mm, a base material = PI, a base material thickness = 70 μm, an intermediate layer thickness = 220 μm, an intermediate layer strength = JIS-A 30 °, a surface layer material = PFA, and a surface layer thickness = 30 μm. The fixing belt 494 rotates in the forward direction with respect to the conveyance direction of the paper P by interlocking the heating roller 491 and the first fixing roller 492.

The first intake fan 495 is an axial fan provided with a propeller having a diameter = 40 mm, a motor, and the like, and is on the entrance side of the paper P and on the non-fixing surface side (hereinafter referred to as “entrance-side non-fixing surface”). Installed. The first intake fan 495 sucks warm air inside and around the fixing device 49 and conveys it to the separation fan 499 via the duct D1.
By installing the first intake fan 495 on the entry side non-fixing surface, there is an advantage that warm air can be sucked, and the paper P is brought into close contact with the transport guide plate of the fixing device 49 by the suction, and the paper P being transported There is a merit that can stabilize the posture. Further, by stabilizing the posture of the paper P being conveyed, it is possible to prevent the occurrence of quality defects. In addition, there is an effect of preventing thermal diffusion to the image forming unit 40 (development, transfer, etc.), and there is a merit that the occurrence of problems due to the rise in the in-machine temperature can be reduced. In addition, by installing on the non-fixing surface side, the toner image formed on the paper P is not disturbed by the intake air.

The second intake fan 496 has the same configuration as that of the first intake fan 495, but the installation location is different. Installed). The second intake fan 496 takes in warm air inside and around the fixing device 49 and conveys it to the separation fan 499 via the duct D2.
There is an advantage that warm air can be sucked by installing the second intake fan 496 on the non-fixing surface on the paper discharge side. In addition, when the paper P attached to the first fixing roller 492 is separated by the separation fan 499, the separation can be assisted by suction by being installed on the paper discharge side.

The third intake fan 497 has the same configuration as the first intake fan 495, but the installation location is different. The third intake fan 497 is installed on the entrance side of the paper P and on the fixing surface side (hereinafter referred to as “entrance side fixing surface”). Is done. The third intake fan 497 takes in warm air inside and around the fixing device 49 and conveys it to the separation fan 499 via the duct D3.
By installing the third intake fan 497 on the entrance side fixing surface, there is an advantage that warm air can be sucked. In addition, there is an effect of preventing thermal diffusion to the image forming unit 40 (development, transfer, etc.), and there is a merit that the occurrence of problems due to the rise in the in-machine temperature can be reduced. It should be noted that the distance between the air inlet and the paper P needs to be such a distance that the toner image formed on the paper P is not disturbed by the air intake.

The fourth intake fan 498 has the same configuration as that of the first intake fan 495, but the installation location is different. The fourth intake fan 498 is located on the paper discharge side and the fixing surface side (hereinafter referred to as “discharge side fixing surface”). Installed. The fourth intake fan 498 takes in warm air inside and around the fixing device 49 and conveys it to the separation fan 499 via the duct D4.
By installing the fourth intake fan 498 on the discharge-side fixing surface, there is an advantage that warm intake air can be drawn.

Each of the first to fourth intake fans 495 to 498 is installed in the vicinity of the heating roller 491, the first fixing roller 492, or the second fixing roller 493, and generates warm air whose temperature has been increased by a heat source such as the heating roller 491. This is common in that it is conveyed to the separation fan 499 via the ducts D1 to D4.
In the present embodiment, the first to fourth intake fans 495 to 498 are installed at the illustrated locations inside the fixing device 49. However, the present invention is not limited to this, and other locations inside the fixing device 49 and image formation. It may be installed near the heat source inside the apparatus 10. In addition, although all of the first to fourth intake fans 495 to 498 are installed, the present invention is not limited to this, and any one of them may be installed in an appropriate combination such as only the paper discharge side or only the entry side. .

The separation fan 499 is an axial fan including a propeller having a diameter = 60 mm, a motor, and the like. The separation fan 499 is connected to the duct D5 that accurately determines the wind blowing position, and blows the wind onto the fixing surface of the paper P. The air to be blown uses warm air that is sucked by the first to fourth intake fans 495 to 498 and conveyed through the ducts D1 to D4. Since the warm air is blown, it is possible to avoid the temperature inside the fixing device 49 from being extremely lowered by the blowing, and to prevent the fixing performance from being lowered.
The separation fan 499 may separate the paper P, on which the toner is fused and adhered to the first fixing roller 492, from the first fixing roller 492 when the wind blowing position, angle, wind speed, and timing are appropriate. it can.

FIG. 3 shows the entry side of the nip region.
The “nip area” refers to an area where the paper P and the first fixing roller 492 or the second fixing roller 493 are in contact with each other.
A first intake fan 495 is installed on the entry side of the nip region, and the first intake fan 495 conveys the virtual conveyance path when taking in warm air inside and around the fixing device 49. The paper P is drawn by a constant suction force by suction. At this time, if the intake ports of the first intake fan 495 are all covered with the paper P, the first intake fan 495 attracts the paper P by the intake air, and the paper P is not conveyed. Further, the first intake fan 495 cannot take in warm air. Therefore, the intake port of the first intake fan 495 needs to be large enough not to be covered by the paper P. Specifically, it is necessary to make the main scanning direction larger than the width of the paper P and to make the sub scanning direction large enough not to be covered by the virtual transport path. In particular, in the sub-scanning direction, it is necessary to ensure the distance x1 having a value larger than 0 as shown in the figure.

FIG. 4 shows the discharge side of the nip area.
A second intake fan 496 is installed on the paper discharge side of the nip region. The second intake fan 496 conveys the virtual conveyance path when taking in warm air inside and around the fixing device 49. The incoming paper P is attracted by a constant suction force by suction. At this time, if all the intake ports of the second intake fan 496 are covered with the paper P, the second intake fan 496 attracts the paper P by the intake air, and the paper P is not conveyed. Also, the second intake fan 496 cannot take in warm air. Therefore, the intake port of the second intake fan 496 needs to be large enough not to be covered by the paper P. Specifically, it is necessary to make the main scanning direction larger than the width of the paper P and to make the sub scanning direction large enough not to be covered by the virtual transport path. In particular, in the sub-scanning direction, it is necessary to make the distance x2 larger than 0 as shown in FIG.

The blowing process will be described with reference to FIG.
By the blowing process, it is possible to prevent the paper P from sticking to the first fixing roller 492 and causing a paper jam. In the air blowing process, air whose temperature has been increased by heat generated during fixing can be used.

  It is assumed that an instruction signal for instructing execution of a print job is output to the control unit 1 as a premise for starting this processing. An instruction signal instructing execution of a print job is output to the control unit 1 when, for example, a print execution button of an operation unit (not shown) is pressed or when a print execution button is pressed from an external terminal.

When an instruction signal for instructing execution of a print job is input, the control unit 1 determines a sheet passing condition for passing the sheet P to the fixing device 49 (step S1).
“Paper passing conditions” include paper information, environmental information, and image information.

  “Paper information” is information relating to paper quality and type, for example, information on thick paper / thin paper, coated paper / general paper, and the like. Note that the thin paper has a lower rigidity than the thick paper, and thus is more likely to stick to the first fixing roller 492. Therefore, for example, when the paper P is thin, the control unit 1 operates the separation fan 499 to blow air on the fixing surface of the paper P and performs control to prevent the paper P from sticking to the first fixing roller 492. become.

  “Environmental information” is information relating to the temperature or humidity around the installation location of the image forming apparatus 10. In the case of low temperature and low humidity, the water contained in the paper P is depleted and the paper P is dried. Since the rigidity of the dried paper P is high, it is difficult to stick to the first fixing roller 492. On the other hand, in the case of high temperature and humidity, the moisture contained in the paper P is large. Since the moisture and moisture of the paper P is low in rigidity, the paper P tends to stick to the first fixing roller 492. Therefore, for example, in the case of high temperature and high humidity, the controller 1 operates the separation fan 499 to blow air on the fixing surface of the paper P, and performs control to prevent the paper P from sticking to the first fixing roller 492. .

“Image information” is information relating to the image pattern, the toner adhesion amount, and the leading edge margin amount.
For example, when the “image pattern” is a so-called solid image, the amount of toner fused to the first fixing roller 492 is large, and thus the paper P is likely to stick to the first fixing roller 492.
Further, when the “toner adhesion amount” is large, the amount of toner fused to the first fixing roller 492 is large, and thus the sheet P is likely to stick to the first fixing roller 492. In the case of a color image forming apparatus as compared with the monochrome image forming apparatus 10, the toner image of a plurality of colors (YMCK colors) is formed in multiple layers, and thus the “toner adhesion amount” increases.
Further, when the “leading margin amount” is small, it means that a certain amount of toner is present at the leading edge of the paper P, and it is difficult to separate the paper P stuck to the first fixing roller 492.
Therefore, for example, in the case of a solid image, when the amount of toner adhesion is large, and when the amount of margin at the tip is small, the control unit 1 operates the separation fan 499 to blow wind on the fixing surface of the paper P, Control for preventing P from sticking to the first fixing roller 492 is performed.

The control unit 1 determines whether air separation is necessary based on the determined sheet passing condition (step S2).
“Air separation” refers to blowing air on a sheet in order to avoid the sheet sticking to the fixing roller or to separate the stuck sheet from the fixing roller. In the present embodiment, it means that wind is blown from the separation fan 499 to the fixing surface of the paper P.

When air separation is not necessary (step S2; N), the control unit 1 does not operate the separation fan 499 or the second intake fan 496, and ends the blowing process.
The “case where air separation is not required” is, for example, the case where the paper P is thick paper under the paper passing condition, the environment is low temperature and low humidity, and the toner image formed on the fixing surface is not a so-called solid image.

  When air separation is necessary (step S2; Y), the control unit 1 determines whether it is time to turn on the first to fourth intake fans 495 to 498 (hereinafter collectively referred to as “intake fans”). (Step S3).

The “case where air separation is required” is, for example, the case where the paper P is thin paper under the paper passing condition, the environment is high temperature and high humidity, and the toner image formed on the fixing surface is a so-called solid image.
Also, the timing for turning on the intake fan is, for example, provided in advance with a sensor for detecting that the paper P has passed on the transport path of the paper P, and after a predetermined time has elapsed since the paper P was detected. .

  If it is not time to turn on the intake fan (step S3; N), the control unit 1 waits until the time to turn on.

When it is time to turn on the intake fan (step S3; Y), the control unit 1 turns on the intake fan (step S4).
Note that the intake fans that are turned on at this time may be all of the first to fourth intake fans 495 to 498, or any one of them, or only the entry side or the discharge side. .

The controller 1 determines whether it is time to turn on the separation fan 499 after turning on the intake fan (step S5).
The separation fan 499 is turned on when, for example, a sensor for detecting that the paper P has passed on the transport path of the paper P is provided in advance, and a predetermined time has elapsed after the paper P is detected.

  If it is not time to turn on the separation fan (step S5; N), the control unit 1 stands by until the time to turn it on.

When it is time to turn on the separation fan (step S5; Y), the control unit 1 turns on the separation fan 499 (step S6).
At this time, the air blown by the separation fan 499 is warm air that has been conveyed through the ducts D1 to D4.

The control unit 1 determines whether it is time to turn off the intake fan and the separation fan 499 (step S7).
The timing for turning off the intake fan and the separation fan 499 is, for example, provided in advance with a sensor that detects the passage of the paper P on the transport path of the paper P, and after a predetermined time has elapsed since the paper P was detected. And

  If it is not time to turn off the intake fan and separation fan 499 (step S7; N), the control unit 1 waits until the time to turn off.

  When it is time to turn off the intake fan and separation fan 499 (step S7; Y), the control unit 1 turns off the intake fan and separation fan 499 (step S8) and ends the blowing process.

FIG. 6 shows the experimental results.
In the experiment, any one of the first to fourth intake fans 495 to 498 is operated during the image forming operation, and the temperature of the fixing belt 494 when the separation fan 499 is operated in conjunction with this ( ° C) and internal temperature (° C) were measured for a certain period of time. The temperature of the fixing belt 494 was measured on the entry side of the nip region, and the internal temperature was measured at a position where the toner image was transferred to the paper P.

It can be said that the fixing performance is secured as the temperature of the fixing belt 494 does not extremely decrease, and even when it decreases, the faster the rise.
Further, it can be said that the lower the internal temperature, the more the temperature increase of the fixing device 49 or the image forming apparatus 10 can be suppressed.

  As shown in FIG. 6, when any one of the first to fourth intake fans 495 to 498 is operated, the temperature of the fixing belt 494 does not extremely decrease, and the internal temperature is There was no extreme rise. In particular, when the third intake fan 497 was operated, the temperature drop of the fixing belt 494 was the smallest and fixing performance could be ensured. Further, when the first intake fan 495 was operated, the temperature rise of the internal temperature could be suppressed most.

  As described above, according to this embodiment, in the fixing device 49 that can perform air separation and prevent paper jamming, it is possible to install the intake fan and use warm air sucked from the intake fan for air separation. Since warm air is blown onto the fixing surface of the paper P, the fixing performance can be maintained. In addition, a new heat source for generating warm air is not required, and air heated by an existing heat source such as the heating roller 491 or the first fixing roller 492 can be used, increasing the power consumption and the temperature of the entire apparatus. A rise can be avoided.

  The intake fan can be installed in the vicinity of the first fixing roller 492 or in the vicinity of the second fixing roller 493.

The first intake fan 495 can be installed on the entry side non-fixing surface.
By installing the first intake fan 495 on the entry side non-fixing surface, there is an advantage that warm air can be sucked, and the paper P is brought into close contact with the transport guide plate of the fixing device 49 by the suction, and the paper P being transported There is a merit that can stabilize the posture. In addition, there is an effect of preventing thermal diffusion to the image forming unit (development, transfer, etc.), and there is a merit that the occurrence of problems due to the temperature rise in the apparatus can be reduced. In addition, it is possible to prevent the occurrence of quality defects by stabilizing the posture of the paper P being conveyed.
Further, by installing on the non-fixing surface, the toner image formed on the paper P is not disturbed by the intake air.

The second intake fan 496 can be installed on the paper discharge side non-fixing surface.
By installing the second intake fan 496 on the non-fixing surface on the paper discharge side, there is a merit that warm air can be sucked. In addition, the paper P is brought into close contact with the transport guide plate of the fixing device 49 by the suction, and the paper being transported There is an advantage that the posture of P can be stabilized. In addition, when the paper P attached to the first fixing roller 492 is separated by the separation fan 499, the separation can be assisted by suction by being installed on the paper discharge side.

The third intake fan 497 can be installed on the approach side fixing surface.
By installing the third intake fan 497 on the entrance side fixing surface, there is an advantage that warm air can be sucked. In addition, there is an effect of preventing thermal diffusion to the image forming unit 40 (development, transfer, etc.), and there is a merit that the occurrence of problems due to the rise in the in-machine temperature can be reduced.

Further, the fourth intake fan 498 can be installed on the discharge side fixing surface.
By installing the fourth intake fan 498 on the discharge side fixing surface, there is an advantage that warm air can be sucked.

  Further, when the intake ports of the first intake fan 495 and the second intake fan 496 are completely covered with the paper P, the intake port and the paper P are in close contact with each other, and the paper P is not conveyed. In order to avoid this, it is preferable that the size of the air inlet is larger than the main scanning direction or the sub scanning direction of the paper P.

DESCRIPTION OF SYMBOLS 10 Image forming apparatus 20 Automatic document conveyance part 30 Scanner part 40 Image forming part 49 Fixing apparatus 491 Heating roller 492 First fixing roller 493 Second fixing roller 494 Fixing belt 495 First intake fan 496 Second intake fan 497 Third intake fan 498 Fourth intake fan 499 Separation fan 50 Paper feed unit 1 Control unit

Claims (7)

If one of the front and back sides of the paper is fixed on the toner image when fixing, and the other is a non-fixing surface, the toner image is fixed on the paper fixing surface by heating and pressing both the fixing and non-fixing surfaces. In the fixing device for fixing,
A first fixing roller for heating and pressing the fixing surface of the paper;
A second fixing roller for heating and pressing the non-fixing surface of the paper;
An air intake section that sucks in air whose temperature has been increased by heat treatment during fixing operation;
A transport section for transporting air sucked by the intake section;
A blower unit that blows air conveyed by the conveyance unit onto the fixing surface of the paper;
A control unit for controlling the air sucked by the air intake unit to be exhausted by the air blowing unit by operating the air blowing unit after operating the air intake unit;
A fixing device provided with   2. The fixing device according to claim 1, wherein the air intake unit is installed inside the fixing device and is installed in the vicinity of the first fixing roller or in the vicinity of the second fixing roller.   3. The fixing device according to claim 1, wherein the air intake portion is installed inside the fixing device, and is installed on the entry side of the nip region and on the non-fixing surface side of the sheet.   4. The fixing according to claim 1, wherein the air intake portion is installed inside the fixing device, and is installed on the paper discharge side of the nip region and on the non-fixing surface side of the paper. apparatus.   5. The fixing device according to claim 1, wherein the air intake portion is installed inside the fixing device, and is installed on the entry side of the nip region and on the fixing surface side of the sheet.   The fixing device according to claim 1, wherein the suction unit is installed inside the fixing device, and is installed on the paper discharge side of the nip region and on the fixing surface side of the paper. . If one of the front and back sides of the paper is fixed on the toner image when fixing, and the other is a non-fixing surface, the toner image is fixed on the paper fixing surface by heating and pressing both the fixing and non-fixing surfaces. In an image forming apparatus provided with a fixing device for fixing,
A first fixing roller for heating and pressing the fixing surface of the paper;
A second fixing roller for heating and pressing the non-fixing surface of the paper;
An air intake section that sucks in air whose temperature has been increased by heat treatment during fixing operation;
A transport section for transporting air sucked by the intake section;
A blower unit that blows air conveyed by the conveyance unit onto the fixing surface of the paper;
A control unit for controlling the air sucked by the air intake unit to be exhausted by the air blowing unit by operating the air blowing unit after operating the air intake unit;
An image forming apparatus.

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