JP2646444B2 - Image heating fixing device - Google Patents

Image heating fixing device

Info

Publication number
JP2646444B2
JP2646444B2 JP63313273A JP31327388A JP2646444B2 JP 2646444 B2 JP2646444 B2 JP 2646444B2 JP 63313273 A JP63313273 A JP 63313273A JP 31327388 A JP31327388 A JP 31327388A JP 2646444 B2 JP2646444 B2 JP 2646444B2
Authority
JP
Japan
Prior art keywords
heating
toner
fixing
film
image
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
Application number
JP63313273A
Other languages
Japanese (ja)
Other versions
JPH02157878A (en
Inventor
木村  茂雄
健作 草加
裕行 足立
Original Assignee
キヤノン株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by キヤノン株式会社 filed Critical キヤノン株式会社
Priority to JP63313273A priority Critical patent/JP2646444B2/en
Priority claimed from US07/444,802 external-priority patent/US5262834A/en
Publication of JPH02157878A publication Critical patent/JPH02157878A/en
Priority claimed from US07/813,912 external-priority patent/US5162634A/en
Application granted granted Critical
Publication of JP2646444B2 publication Critical patent/JP2646444B2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to an image incorporated in an image forming apparatus such as a copying machine, a laser beam printer, a facsimile, a microfilm reader printer, an image display (display) device, and a recorder. The present invention relates to a heat fixing device. More specifically, a recording material (electrofax sheet / electrostatic sheet / electrostatic sheet) is formed using a visible material (hereinafter referred to as a toner) made of a heat-meltable resin or the like by an appropriate image forming process means such as electrophotography, electrostatic recording, or magnetic recording. A non-fixed visible image (hereinafter, referred to as a toner image) corresponding to the target image information is formed and supported on a surface of a recording sheet, a transfer material sheet, a printing paper, or the like by a direct method or an indirect (transfer) method. The present invention relates to an image heating and fixing apparatus in an image forming apparatus for performing heat fixing processing of a toner image as a permanent fixed image on a surface of a recording material carrying the image.

2. Description of the Related Art Conventionally, as an image fixing apparatus of a heat fixing type, an unfixed toner is formed by a heating roller maintained at a predetermined temperature and a pressure roller having an elastic layer and pressing against the heating roller. A roller fixing system in which a recording material on which an image is formed is heated while being nipped and conveyed is often used.

A belt fixing system as disclosed in U.S. Pat. No. 3,578,797 is also known. This is done by bringing the toner image into contact with the heating element web and heating it to its melting point to melt it.After melting, the toner is cooled to a relatively high viscosity, and the toner image is removed from the heating element web in a state where the tendency to adhere to the toner is reduced. It is a method of fixing without causing offset by going through the process of peeling.

Further, Japanese Patent Publication No. 51-29825 discloses that a support on which a toner powder image is formed is sandwiched between a pair of heating bodies under pressure.
This is heated to a temperature higher than the melting point of the powder image to dissolve the toner powder image. Thereafter, the heating is stopped and this is forcibly cooled. Is disclosed in which an electrophotographic fixing method is used in which an image is peeled off from a heating member.

(Problems to be Solved by the Invention) However, each of the above-mentioned conventional fixing systems has the following problems.

Thermal roll fixing method It takes a considerable time to rise to a predetermined temperature, during which time the image forming operation is prohibited. That is, there is a so-called wait time.

Large electric power is required because heat capacity is required.

A high heat-resistant roller bearing requires a heat-resistant special bearing.

The configuration is such that the roller touches the roller directly, which is dangerous and requires a protective member.

The recording material is wrapped around the roller due to the constant temperature and the curvature of the roller, so that a jam problem of the recording material is easily observed.

Belt fixing method This method also has the same problems as those of the above-described heat roller fixing method, such as the wait time and large power consumption.

Fixing method of Japanese Patent Publication No. 51-29825 In order to separate the toner image from the belt when the toner image falls below the glass transition point, when the toner is separated from the belt, the toner is completely rubbery.
The surface property of the toner image is similar to the surface of the belt, and the surface of the fixed toner image becomes glossy and the image quality deteriorates.

Further, when a wax having a glass transition point of 0 ° C. or lower is used as a material of the toner, it is practically difficult to cool the toner to a temperature lower than the glass transition point.

Further, when the toner is cooled below the glass transition point, the toner image itself solidifies and the bonding force increases, while the adhesive force between the toner and the belt also increases. Therefore, much toner remains on the belt surface when the toner and the belt are separated.

There is a possibility that the support may be wound around the belt surface, and it may be necessary to provide a separating member in order to prevent this.

And so on.

In view of the above, it is an object of the present invention to provide a practical image heating and fixing apparatus which does not have the problems as in the above-described conventional apparatus.

(Means for Solving the Problems) According to the present invention, there is provided a stationary still heater provided with a heating element, and one surface in contact with the position of the heating element of the heating element and the surface of the heating element where the heating element does not exist. A film that slides and moves together with the other surface in contact with the recording material, and heats and fixes an unfixed toner image on the recording material by heat from the heating element via the film. Wherein the unfixed toner image is heated to a temperature equal to or higher than the melting point of the toner at the heating element position of the heating element via the film, and the heated toner image continues to be free of the heating element of the heating element via the film. An image heating / fixing apparatus wherein the film and the recording material are separated when the temperature is lowered on the surface and the temperature is higher than the glass transition point of the toner.

(Operation) The unfixed toner image is heated to a temperature equal to or higher than the melting point of the toner by the heating element. When the temperature of the heated toner image decreases and is higher than the glass transition point of the toner, the film and the recording material are separated. Even if the unfixed toner image is heated to a temperature equal to or higher than the melting point of the toner in order to improve the fixing property by separating the toner, the temperature of the toner image is lowered when the film and the recording material are separated. In this case, since the temperature of the toner image is higher than the glass transition point, gloss of the image can be prevented.

That is, the recording material to be fixed between the pressure film and the fixing film which is driven in the same direction at the same speed as the conveyed recording material to be fixed is an unfixed toner (developing material) image carrier on the fixing film surface. The sides of the heating element and the pressing member receive a pressing force (fixing nip) in a state of being in close contact with the fixing film in a state of being in close contact with each other, causing a surface deviation or wrinkling due to a speed difference therebetween. Without passing through, it passes through closely together.

In the process of passing through the fixing nip, the unfixed toner image on the recording material surface is heated and softened by a heating element via a fixing film.
It is melted, and particularly its surface layer greatly exceeds the melting point of the toner and is completely softened and melted (melted at a high temperature). In this case, the heating element, the fixing film, the toner image, and the recording material are satisfactorily pressed and adhered by the pressing member in the fixing nip portion, and the heat is effectively transferred, so that the toner is sufficiently softened and melted by heating for a short time. As a result, good fixability can be obtained.
On the other hand, the temperature rise of the recording material itself is extremely small in practice, and the waste of heat energy is small. In other words, the recording material itself is not heated substantially, and only the toner is heated and softened and melted effectively, and the heat fixing of the toner image can be satisfactorily executed with low power.

Then, while the temperature of the toner (developing material) of the toner image, which is a visualized image that has been heated and fixed by passing the recording material through the fixing nip portion, is lowered and the temperature is still higher than the glass transition point of the toner, the recording material is By separating the fixing film from the fixing film, the toner that is still at a temperature higher than the glass transition point at the time of separation has appropriate rubber properties, so the toner image surface at the time of separation does not follow the fixing film surface, Since the toner image is cooled and solidified while maintaining the surface property, no excessive image gloss is generated on the fixed toner image surface. Also, while the heat-fixed toner image is still at a temperature higher than the glass transition point, the bonding strength (adhesion) between the toner image surface and the fixing film surface in a close contact state is equal to or lower than the glass transition point when the toner image is adhered to the fixing film surface. It is smaller than the bonding force between the surface of the solidified toner image and the surface of the fixing film which have been cooled and solidified. As a result, there is almost no toner offset to the fixing film surface during the mutual separation process between the recording material and the fixing film. Is not liable to cause jam trouble.

While the heat-fixed toner image is still at a temperature higher than the glass transition point, the heat-fixed toner image of the recording material separated from the fixing film surface is cooled while the separated recording material is conveyed to the discharge section (naturally). Cooling or forced cooling means using air blowing, heat radiation fins, or the like may be used), and the solidified state is output to the discharge unit.

The recording material to be image-fixed is brought into close contact with the fixing film so that the unfixed toner image carrying surface faces the fixing film surface running in this way, and the toner image is heated and melted by a heating element through the fixing film, and the toner is used. Since the recording material and the fixing film are separated from each other while the image is still at a temperature higher than the glass transition point of the toner, there is no occurrence of toner offset to the fixing film, poor separation of the recording material, winding, and heat capacity. It is possible to use a small heating element and supply power to the heating element with a simple configuration, and it is sufficient for the temperature (melting point or softening point) at which the toner should be heated for fixing. Maintaining a high-temperature heating element makes it possible to efficiently heat a toner image, and it is possible to use a small amount of energy without causing a fixing defect. Do not fixing it is possible, as a result,
This has the effect of obtaining an image forming apparatus with a small standby time during use of the apparatus, low power consumption, and a small rise in temperature inside the apparatus.

(Embodiment) <Embodiment 1> (FIGS. 1 to 4) FIG. 4 shows a schematic configuration of an example of an image forming apparatus incorporating an image heating and fixing device 11 according to the present invention. The image forming apparatus of the present embodiment is an electrophotographic copying apparatus of a reciprocating platen type, a rotating drum type, and a transfer type.

(1) Overall Schematic Configuration of Copying Apparatus In FIG. 4, reference numeral 100 denotes an apparatus housing, and 1 denotes a reciprocating original mounting plate made of a transparent plate member such as a glass plate disposed on a top plate 100a of the apparatus housing. It is a mounting table, and is reciprocally driven on the upper surface plate 100a of the machine at a predetermined speed to the right side a and the left side a 'in the drawing.

G is an original, which is placed on the upper surface of the original placing table 1 with the image side to be copied facing downward according to a predetermined placing reference;
The original is set by placing the original cover 1a on top of the cover.

Reference numeral 100b denotes a slit opening serving as a document illuminating unit which is opened on a surface of the machine housing upper plate 100a with a direction perpendicular to the reciprocating movement direction of the document placing table 1 (direction perpendicular to the paper surface) as a longitudinal direction. The downward image surface of the document G placed and set on the document table 1 sequentially passes through the position of the slit opening 100b from the right side to the left side during the forward movement of the document table 1 to the right side a. During the passage, the light L of the lamp 7 is received through the slit opening 100b and the transparent document table 1 for illumination scanning. The reflected light of the illumination scanning light on the document surface is image-formed and exposed on the surface of the photosensitive drum 3 by the short-focus small-diameter imaging element array 2.

The photosensitive drum 3 is coated with a photosensitive layer such as a zinc oxide photosensitive layer or an organic semiconductor photosensitive layer, and is driven to rotate clockwise as indicated by an arrow b at a predetermined peripheral speed around a center support shaft 3a. The charger 4 was subjected to a uniform charging process of positive or negative polarity, and the uniformly charged surface was subjected to the image forming exposure (slit exposure) of the original image to form an image on the surface of the photosensitive drum 3. An electrostatic latent image corresponding to a document image is sequentially formed.

The electrostatic latent image is sequentially visualized by a toner made of a resin or the like which is softened and melted by heating by the developing device 5, and the developed toner image is transferred to a portion where the transfer discharger 8 as a transfer portion is provided. I will do it.

S denotes a cassette in which transfer material sheets P as recording materials are stacked and stored, and the sheets in the cassette are fed one by one by the rotation of the feed roller 6, and then the toner on the drum 3 is moved by the registration roller 9. When the leading end of the image forming section reaches the transfer discharger 8, the leading end of the transfer material sheet P also reaches the position between the transfer discharger 8 and the photosensitive drum 3, and the timing is synchronized so that they coincide with each other. Will be fed. Then, the transfer discharger 8 is applied to the surface of the sheet.
As a result, the toner image on the photosensitive drum 3 side is sequentially transferred.

The sheet to which the toner image has been transferred in the transfer unit is sequentially separated from the surface of the photosensitive drum 3 by a separation unit (not shown),
The unfixed toner image carried by the fixing device 11 described below is heated and fixed by 10 and is subjected to a heat fixing process, and is discharged onto a paper output tray 12 outside the apparatus as an image formed product (copy).

On the other hand, the surface of the photosensitive drum 3 after the transfer of the toner image is repeatedly used for image formation by receiving the removal of adhered contaminants such as untransferred toner by the cleaning device 13.

(2) Fixing Device 11 FIG. 1 is an enlarged view of the fixing device 11 part.

Reference numeral 25 denotes an endless belt-shaped fixing film, which is a left driving roller 26, a right driven roller 27, and a low heat capacity linear member as a heating member fixedly supported and disposed below the two rollers 26, 27. The three members parallel to each other with the heating element 20
It is stretched between 26, 27 and 20.

The driven roller 27 is an endless belt-shaped fixing film 25.
The fixing film
Reference numeral 25 denotes a transfer material sheet P carrying an unfixed toner image Ta conveyed from the image forming unit 8 on the upper surface at a predetermined peripheral speed in the clockwise direction accompanying the clockwise rotation of the drive roller 26.
Is rotated at wrinkles, meanders, and speed delays at the same peripheral speed as the transport speed of.

Reference numeral 28 denotes a pressure roller having a rubber elastic layer having good releasability, such as silicon rubber, as a pressure member, and sandwiching the descending film portion of the endless belt-shaped fixing film 25 to form the heating element 20. The transfer material sheet P is rotated counterclockwise in the forward direction in the transport direction of the transfer material sheet P by being pressed against the lower surface by a biasing means (not shown) with a contact pressure of, for example, a total pressure of 4 to 7 kg.

Endless belt-shaped fixing film 25 that is driven to rotate
Is repeatedly used for heating and fixing the toner image, so that a thin material having excellent heat resistance, releasability and durability and having a thickness of generally 100 μm or less, preferably 50 μm or less is used. For example, a single-layer film of a heat-resistant resin such as polyimide, polyetherimide, PES, or PFA (tetrafluoroethylene-perfluoroalkylvinyl ether copolymer resin) or a composite layer film, for example, at least the image contact surface side of a 20 μm thick film And a 10 μm-thick release coating layer obtained by adding a conductive material to a fluororesin such as PTFE (tetrafluoroethylene resin) and PAF.

The low-heat-capacity linear heating element 20 as a heating element according to the present example has a horizontally long rigidity, high heat resistance, and heat insulating property whose longitudinal direction is the transverse direction of the fixing film (the direction perpendicular to the running direction of the fixing film 25). A heater support 24, and a heating element 22 which is integrally attached to and held on the lower surface side of the support along the length of the lower surface.
It has a heater substrate 21 provided with a temperature detecting element 23 and the like.

The heater support 24 secures the overall strength of the heating body 20, and is, for example, PPS (polyphenylene sulfide), PAI
(Polyamide imide), PI (polyimide), PEEK (polyetheretherketone), high-heat-resistant resin such as liquid crystal polymer, or a composite material of such a resin and ceramic metal or glass.

The heater substrate 21 has a thickness of 1.0 mm, a width of 10 mm, and a length of 2 as an example.
It is a 40 mm alumina substrate, and the heating element 22 is a substrate as an example.
A linear or belt-like low-heat-capacity current-generating heating element formed by applying an electric resistance material such as Ta 2 N to a width of 1.0 mm (screen printing or the like) along the length substantially in the center of the lower surface of 21. The temperature measuring element 23 is, for example, an upper surface of the substrate 21 (a heating element).
This is a low-heat-capacity resistance thermometer, such as a Pt film, provided by coating (screen printing, etc.) along the length substantially at the center of the surface opposite to the side where 22 is provided.

In the case of the present example, the linear or belt-like heating element 22 is energized from both longitudinal ends thereof to generate heat over the entire length. The energization has a pulse-shaped waveform of DC 100 V and a period of 20 msec, and a desired temperature controlled by the temperature detecting element 23.The energization control circuit is configured to give a pulse corresponding to the energy release amount by changing the pulse width. The heating element 22 is controlled within a range of about 0.5 to 5 msec, and immediately rises to about 200 to 300 ° C. every time a pulse is input. In this embodiment, a sensor for detecting the leading and trailing edges of the sheet (not shown) is provided closer to the fixing device on the upstream side of the fixing device 11 in the transfer material sheet conveyance direction, and the sensor supplies a current to the heating element 22 according to a sheet detection signal. The period is controlled only for the necessary period during which the sheet P passes through the fixing device 11.

The fixing film 25 is not limited to the endless belt shape.
As shown in the figure, the end fixing film 25 wound in a roll around the feed shaft 30 is stopped by the take-up shaft 31 through the space between the heating element 20 and the pressure roller 28, and A configuration may be adopted in which the transfer material sheet P travels from the side to the winding shaft 31 at the same speed as the transport speed of the transfer material sheet P.

(3) Fixing operation The leading end of the transfer material sheet P carrying the unfixed toner image Ta on the upper surface, which has been conveyed from the transfer unit 8 to the fixing device 11 by the image forming operation of the apparatus in response to the image forming start signal, is fixed to the fixing device. The rotation (or running) of the fixing film 25 is started when it is detected by the above-described sensor (not shown) disposed closer to the fixing film 25,
The transfer material sheet P is guided by a guide 29, and a fixing sheet 25 at a pressure contact portion N (fixing nip portion) between the heating body 20 and the pressure roller 28.
And the pressure roller 28, the unfixed toner image surface is brought into close contact with the lower surface of the fixing film 25 moving in the same direction at the same speed as the conveying speed of the sheet P to reduce surface deviation and wrinkling. In the overlapping state with the fixing film 25, the sheet passes through the fixing nip N between the heating element 20 and the pressure roller 28 while receiving the pinching pressure without being generated.

FIG. 2 is a schematic enlarged sectional view of a lower surface portion of the heating body including a fixing nip portion between the heating body 20 and the pressure roller 28.

The front edge and the rear edge of the lower surface of the heating element on which the fixing film 25 slides and travels on the upstream side in the fixing film traveling direction, that is, the support 24
Yes the leading edge E 1 and the trailing edge E 2 and chamfered with each radius of curvature r 1 · r 2, and the fixing film 25 is smoothly heated along the driven roller 27 to the chamfered leading edge E 1 enters to the lower side of the body 20, and travels in close contact with the heating body lower surface with a large bending angle θ upwardly along said chamfered trailing edge E 2 for path deflected driving roller 26 side.

w is the width dimension of the heating element 22 provided on the lower surface of the heating element, and the heating element 22 is within the mutual pressure contact width region between the lower surface of the heating element 20 and the upper surface of the pressure roller 28, that is, the width of the fixing nip N. Exist in the area.

In the width region of the fixing nip portion N, the starting point on the upstream side in the fixing film running direction is position A, the terminal end on the downstream side is position D, and the heating element 22
Assuming that the upstream end of the width region W in the fixing film traveling direction on the upstream side in the running direction is position B and the end on the downstream side in position C is the position C, the transfer material sheet P conveyed to the fixing device 11 and to which the image is to be fixed.
The unfixed toner image Ta enters the fixing nip N from the position A and starts to be heated by the heating element 20 via the fixing film 25.

When the toner passes from the position B to the position C, that is, the area immediately below the heating element 22, the toner is heated at the highest temperature and is completely softened (melted at a high temperature) and softened and adhered to the surface of the sheet P.

After passing through the area immediately below the heating element 22, the position C is shifted to the position D.
During this time, the temperature of the lower surface of the heating element 20 becomes lower than that between the positions B and C in the area immediately below the heating element, so that the temperature of the toner Tb decreases and the toner viscosity increases. However, the toner temperature is higher than the glass transition point of the toner.

It conveyed in a state between extending from position D which is the end portion of the fixation nip N to the heating body the lower surface of the chamfered rear end E 2 are adhering with an adhesive force of the softened toner Tb on the lower surface of the sheet P is traveling fixing film 25 Is done.

Along the chamfered rear end E 2 of the chamfered rear end portion E in the second fixing film 25 is small radius of curvature r 2 of the heater 20 with a large bending angle θ to the path deflected driving roller 26 side. That is the path deflected away rapidly from the sheet P surface, the stiffness (the waist strength) of the sheet P as well overcome the separation position of this chamfered rear end E 2 in adhesion to the fixing film 25 side of the sheet P The sheet P and the fixing film 25 are separated.

At the time of this separation, the temperature of the toner Tb is still higher than the glass transition point of the toner, and therefore, the bonding force (adhesive force) between the sheet P and the fixing film 25 at this time of separation.
Since the sheet P is small, the sheet P hardly causes toner offset to the surface of the fixing film 25, and the sheet P is always smoothly separated without being wound and jammed with the sheet P adhered to the surface of the fixing film 25 due to poor separation. Go.

And, since the toner Tb in a state of a temperature higher than the glass transition point has an appropriate rubber property, the toner image surface at the time of separation has an appropriate uneven surface property without following the fixing film surface, and this surface property is improved. Since the toner image is maintained and cooled and solidified, a proper image gloss is not generated on the fixed toner image surface, and high quality image is obtained.

The sheet P separated from the fixing film 25 is guided by the guide 35 and reaches the discharge roller pair 36. The temperature of the toner Tb higher than the glass transition point naturally lowers (natural cooling), and the temperature is lower than the glass transition point. Then, the solidified Tc is reached, and the sheet P on which the image has been fixed is output onto the tray 12.

Specifically, assuming that a toner having a glass transition point of 50 ° C. and a melting point of 130 ° C., which is mainly composed of a thermoplastic resin, is used as a developing material, the fixing film surface temperature at position A is 110
C., the same temperature between the positions B and C was set at 150 ° C., the same temperature at the position D was set at 130 ° C., and the same temperature at the position E 2 (separation position) was set at 100 ° C., and good results were obtained. Toner from position D to position E 2
The temperature of Tb is maintained between the glass transition point and the melting point of the toner, and the toner Tb is in a rubber-like form to enable appropriate adhesion to the film 25.

The radius of curvature r 2 of the heating body the lower surface of the chamfered rear end E 2 is a sheet separating position may have to set in the range of 0.5 to 10 mm, and it is preferably to 5mm or less. The bending angle θ of the film 25 is set to 5 ° or more, preferably 25 ° or more.

In the present embodiment, since the linear heating element 22 of the heating element 20 is instantaneously heated to a sufficiently high temperature relative to the melting point (or fixable temperature) of the toner by energization, it is not necessary to preheat the heating element. The heat transfer to the pressure roller 28 during non-fixing is small. Also at the time of fixing, fixing film, toner image,
Since the sheet is interposed in the fixing nip portion N between the heating body 20 and the pressure roller 28 and the heat generation time is short, a sharp temperature gradient is generated. The temperature is maintained below the melting point of the toner even when continuous image formation is performed to the extent required. In the apparatus of this embodiment having such a configuration, the toner image formed of the heat-fusible toner on the sheet P is first heated and melted by the heating body 20 via the fixing film 25, and particularly, the surface portion thereof is completely removed. Softens and melts. At this time, the heating element, the fixing film, the toner image, and the sheet are in good contact with each other by the pressure roller 28, and heat is efficiently transferred. Thereby, the heating of the sheet P itself can be suppressed as much as possible, and the toner image can be efficiently heated and melted. In particular, the energy saving can be achieved by limiting the heating time.

Since the heating element is small enough, the heat capacity is small, and it is not necessary to raise the temperature of the heating element in advance.Therefore, the power consumption during non-image formation can be reduced, and the temperature inside the apparatus can be prevented from rising. Become.

<Example 2> (Figure 5) This example is a pressure roller a lower surface of the chamfered rear end E 2 of the heater 20
It is characterized in that it has a convex shape protruding downward toward 28.

Sheet P words after the sheet P has passed between the position A · D is a fixing nip N until also separated the fixing film 25 by the chamfered rear end E 2 of the heating body lower surface of the downward convex
Is pressed against the surface of the pressure roller 28 with light pressure.

Thus it is securely adhered to the fixing film 25 surface sheet P and the toner image Tb until the chamfered rear end E 2 of the heating body from the end position D of the fixing nip portion N becomes possible to convey. In the case of FIG. 2 of the first embodiment, when the amount of toner on the sheet P is extremely small, the bonding force between the sheet P and the fixing film 25 via the softening toner Tb becomes extremely small. While P may separate from the fixing film 25 due to gravity during the time from the position D to the separation position E, the sheet conveyance may become unstable. However, according to the configuration of this example, when the toner amount is extremely small, However, the sheet conveyance path to the separation position E is fixed, and the sheet P is always separated from the fixing film 25 at the separation position E, so that the sheet conveyance is stabilized.

Since the temperature of the heating element can be increased, the fixing property is improved. That is, in this embodiment, the surface temperature of the fixing film 25 between the positions B and C, which are regions immediately below the heating element, is set to 180 ° C., which is higher than 150 ° C. in the first embodiment. As a result, the fixing film surface temperature at the position D is 160 ° C., which is higher than the toner melting point (130 ° C.). From this position D to the separation position E, as described above, the toner image Tb and the sheet P are always stably adhered to the surface of the fixing film 25 and the support 24 of the heating element 20 and the pressure roller
Pressed between 28 and transported, so pressurizing roller
The toner temperature is 90 ° C. when the heat of the toner is radiated to the support 28 and the toner and reaches the separation position E.
° C) and the glass transition point (50 ° C) of the toner.
The sheet P is smoothly separated from the surface. Therefore, it is possible to improve the fixing property by increasing the temperature of the heating element.

If a toner made of a material having a sufficient cohesive force at a temperature higher than the melting point is used, the toe temperature at the separation position E may be higher than the toner melting point. In that case, the heating temperature is further increased, and further improvement in fixability can be expected without causing high-temperature offset.

<Embodiment 3> (FIG. 6) In this embodiment, a heating film 20 similar to that of the above-described embodiment 1 is used, and the heating film 20 is vertically opposed to the downstream side of the heating member 20 and the pressure roller 28 in the sheet conveying direction. A member 40 and a small roller 41 are disposed, and the fixing film 25 is guided from the lower surface of the heating body 20 to a guide member.
A transport belt 42 made of silicon rubber with a base cloth having a thickness of 500 μm is stretched between the pressure roller 28 and the small roller 41 by bending and traveling upward through the leading edge of 40. . The small roller 41 drives the belt 42 to rotate. The guide member 40 is a separating member. The radius of curvature of the lower edge 40a around which the fixing film 25 bends and turns is set to 1 mm, and the bending angle θ of the film is set to 120 °.

The fixing nip portion N is a pressure contact portion between the heating body 20 and the pressure roller 28 which are opposed to each other with the fixing film 25 and the transport belt 42 interposed therebetween. Heated between D. Thereafter, the sheet P is supported by the conveyance belt 42 and pressed and adhered to the lower surface of the fixing film 25 to be conveyed until reaching the lower edge portion of the guide member 40 at the separation position E, and is separated from the film 25 at the separation position E by curvature.

The toner used in this example has a glass transition point of −10 ° C. and a melting point of 70.
It is mainly composed of a wax-based resin at a temperature of 70 ° C., and has a so-called sharp melt characteristic in which the viscosity sharply decreases at 70 ° C. or higher.

The surface temperature of the fixing film between the positions B and C, which is a region immediately below the heating element 22, is 100 ° C., which is far higher than the melting point of the toner. To join.

The fixing film surface temperature at the position D is 90 ° C., and the toner Tb is still in a very low viscosity state.

Thereafter, the toner Tb melts while being transported to the separation position E.
The toner is cooled down to 55 ° C, which is between 70 ° C and the glass transition point of -10 ° C, and the cohesive force between the toners is sufficiently high. At the separation position E, the film does not remain on the fixing film 25 surface.
Good curvature separation from 25.

In the case of this example, even if a sharp melt toner is used as the toner, the toner and the film can be reliably brought into close contact with each other and transported to the separation position E until the toner temperature becomes equal to or lower than the melting point.

<Embodiment 4> (FIG. 7) This embodiment is a modification of the above-described Embodiment 3, in which a silicon belt 42A having a thickness of 3 mm is used as a transport belt, and a core metal 28A is used instead of the pressure roller (28). It was what was.

The belt 42A has a high rigidity and the toner Tb is fixed on the fixing film 25.
Strong force to press against the lower surface of Therefore, there is no possibility that the toner that has passed through the fixing nip N is separated from the film surface before reaching the separation position E.

<Others> (1) With respect to the heating element 20, the substrate 21 may be made of heat-resistant glass, heat-resistant resin such as PI / PPS or the like in addition to alumina. Heating element 22 is Ta 2 In addition to the N nichrome · RuO 2 · Ag / Pd
And the like can be used. As the temperature detecting element 23, a bead thermistor having a resistance capacity can be used in addition to a temperature measuring resistor such as a Pt film. It is preferable to provide a sliding protective film layer such as a thin heat-resistant glass layer on the lower surface of the heating body on which the fixing film 25 slides and travels. The heating element 22 is disposed on the upper surface side of the substrate 21 (the surface opposite to the fixing film facing surface of the substrate 21),
23 may be provided on the lower surface side of the substrate 21 (the side facing the fixing film of the substrate 21), or the heating element 22 and the temperature detecting element 23 may be provided on the lower surface side of the substrate 21. . The energization of the heating element 22 may be controlled by normal energization control instead of pulse energization.

(2) When a fixed film is used as the fixing film 25 as in the apparatus shown in FIG. 3, if the fixing film on the sending shaft side is almost completely wound on the winding shaft side, a new roll-wound film is used. Can be exchanged (rewinding exchange type). In the case of such a take-up exchange type, the thickness can be reduced regardless of the durability of the fixing film, and the power consumption can be reduced. For example, PE as fixing film
Using an inexpensive substrate such as T (polyester) film,
For example, a thin material having a heat resistance of about 12.5 μm or less can be used.

Or, since the toner offset to the fixing film surface does not substantially occur as described above, if the thermal deformation or deterioration accompanying the use of the fixing film is small, the used sheet wound on the take-up shaft side can be removed in a timely manner. And rewinding control to the shaft side,
Alternatively, it can be used a plurality of times by reversing the winding shaft side and the sending shaft side, etc. (rewinding repetitive use type).

In the rewinding repeated use type, as the fixing film, for example, a 25 μm thick polyimide resin film is used as a base material having excellent heat resistance, mechanical strength, etc., and a release layer made of a highly releasable fluororesin or the like on its surface. It is preferable to automatically control the pressure release mechanism during reverse rewinding to keep the contact between the heating element and the pressure roller in the released state.

In the case of multiple use such as a rewinding repetitive use type or an endless belt type, a felt pad is provided for cleaning the film surface, and a slight release agent, for example, silicon oil is impregnated to contact the pad with the film surface. For example, the film surface may be cleaned and the releasability may be further improved. In the case where the fixing film is an insulating fluororesin-treated product, static electricity that disturbs the toner image is likely to be generated on the film. Therefore, in order to cope with this, it is preferable to remove the static electricity with a grounded removing brush. A bias voltage may be applied to the brush without grounding to charge the film within a range that does not disturb the toner image. Further, it is one measure to add conductive powder fibers, for example, carbon black or the like, to the fluororesin to prevent the above-mentioned image disturbance due to static electricity. In addition, the charge roller can be de-charged and made conductive by the same means. Further, an antistatic agent or the like may be applied or added.

Fixing film is endless belt type, rewindable type,
Regardless of the type of rewinding and repetitive use, the replacement of the fixing film and the like can be facilitated by making the cartridge structure detachable at a predetermined portion of the fixing device 11.

The fixing device of the present invention is not limited to the transfer type electrophotographic apparatus illustrated in FIG. 4 and the image forming process / means is a direct type in which a toner image is formed and carried directly on electrofax paper, electrostatic recording paper, or the like, Copiers, laser beam printers, facsimile, microfilm reader printers, which form an image on a recording material with a heat-fusible toner using a magnetic recording image forming method or any other appropriate image forming process and means, and heat and fix it. The present invention can be effectively applied as an image heating and fixing device in various image forming apparatuses such as a display device and a recording machine.

(Effects of the Invention) As described above, the image heating / fixing apparatus of the present invention heats an image with high efficiency using a small and simple heating means having a small heat capacity, and uses a small amount of energy to cause poor fixing, offset, and jamming of a recording material. Also, it is possible to fix images sufficiently well without giving excessive gloss to the fixed image, and has features such as standby time and power consumption when using the device, and small rise in temperature inside the machine. It is practical as an image heating and fixing apparatus that does not have the above-mentioned problems as in the conventional apparatus, and the intended purpose is well achieved.

Particularly, in the present invention, since the heated toner image slides at a position where the heating element of the heating element does not exist and the temperature decreases, the temperature can be decreased by using a part of the heating element, and the heating element can be used. Since the toner temperature lowering portion can also be used, the device configuration can be made compact.

According to the present invention, the film slides on the surface of the heating element where the heating element does not exist after the film slides on the heating element position of the heating element, so that the film remains on the heating element side even after passing through the heating element position of the heating element. , And can prevent the film from waving, thereby suppressing image disturbance.

[Brief description of the drawings]

1 is a schematic configuration diagram of a fixing device of the first embodiment, FIG. 2 is an enlarged view of a fixing nip portion thereof, FIG. 3 is a schematic configuration diagram of another component device, and FIG. 4 incorporates the fixing device. FIGS. 5 to 7 are schematic structural views of an example of the image forming apparatus, and FIGS. 5 to 7 are schematic structural views of the fixing devices of the second to fourth embodiments, respectively. Numeral 11 denotes a fixing device, 25 denotes a fixing film, 28 denotes a pressure roller, P denotes a sheet, Ta denotes an unfixed toner, Tb denotes a heat-softened / fused toner, Tc denotes a solidified toner, N denotes a fixing nip portion, and E 2 denotes a fixing nip.
E is the separation position.

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Shigeo Kimura 3-30-2 Shimomaruko, Ota-ku, Tokyo Canon Inc. (56) References JP-A-59-157678 (JP, A) JP-A-59 -68766 (JP, A) JP-A-61-122665 (JP, A) JP-B-50-16936 (JP, B2)

Claims (1)

    (57) [Claims]
  1. A stationary stationary heating element provided with a heating element; one surface of which is slid in contact with a position of the heating element of the heating element and a surface of the heating element where the heating element does not exist; A film that moves together with the film, and heats and fixes an unfixed toner image on a recording material by heat from the heating element through the film. Is heated to a temperature equal to or higher than the melting point of the toner at the heating element position of the heating element, the temperature of the heated toner image is continuously reduced via the film on the surface of the heating element where the heating element does not exist, and When the temperature is higher than the glass transition point, the film and the recording material are separated from each other.
JP63313273A 1988-12-12 1988-12-12 Image heating fixing device Expired - Fee Related JP2646444B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP63313273A JP2646444B2 (en) 1988-12-12 1988-12-12 Image heating fixing device

Applications Claiming Priority (6)

Application Number Priority Date Filing Date Title
JP63313273A JP2646444B2 (en) 1988-12-12 1988-12-12 Image heating fixing device
US07/444,802 US5262834A (en) 1988-12-06 1989-12-01 Image fixing apparatus
EP89122388A EP0372479B2 (en) 1988-12-06 1989-12-05 An image fixing apparatus
DE68914106T DE68914106T3 (en) 1988-12-06 1989-12-05 Image fixing device.
KR89018043A KR950013027B1 (en) 1988-12-06 1989-12-06 Image fixing apparatus
US07/813,912 US5162634A (en) 1988-11-15 1991-12-27 Image fixing apparatus

Publications (2)

Publication Number Publication Date
JPH02157878A JPH02157878A (en) 1990-06-18
JP2646444B2 true JP2646444B2 (en) 1997-08-27

Family

ID=18039225

Family Applications (1)

Application Number Title Priority Date Filing Date
JP63313273A Expired - Fee Related JP2646444B2 (en) 1988-12-12 1988-12-12 Image heating fixing device

Country Status (1)

Country Link
JP (1) JP2646444B2 (en)

Families Citing this family (122)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH04166966A (en) * 1990-10-31 1992-06-12 Babcock Hitachi Kk Thermal fixing device
US5099288A (en) * 1990-11-19 1992-03-24 Lexmark International, Inc. Fixing device with selectable finish
JPH04284481A (en) * 1991-03-14 1992-10-09 Hitachi Koki Co Ltd Thermal fixing device
US5444521A (en) * 1991-07-15 1995-08-22 Canon Kabushiki Kaisha Image fixing device capable of controlling heating overshoot
EP0534417B1 (en) * 1991-09-24 1997-02-12 Canon Kabushiki Kaisha Image heating apparatus with multiple temperature detecting members
JPH05205851A (en) * 1991-11-14 1993-08-13 Canon Inc Heater and fixing device
JP3301162B2 (en) * 1993-04-28 2002-07-15 キヤノン株式会社 Heating equipment
US5532806A (en) * 1993-04-28 1996-07-02 Canon Kabushiki Kaisha Image fixing apparatus having means for preventing temperature unevenness
JPH07199699A (en) * 1993-12-28 1995-08-04 Canon Inc Film for heater and heater
US5682576A (en) * 1994-06-07 1997-10-28 Canon Kabushiki Kaisha Fixing device
JPH0830125A (en) 1994-07-12 1996-02-02 Canon Inc Heater and image formning device
EP0698831B1 (en) 1994-08-22 2003-04-16 Canon Kabushiki Kaisha Method for controlling an image formation condition in an image forming apparatus
JPH08314312A (en) * 1995-05-22 1996-11-29 Canon Inc Rotary body for pressing, heating device and image forming device
JP3445035B2 (en) * 1995-07-28 2003-09-08 キヤノン株式会社 Heating equipment
JP3445034B2 (en) * 1995-07-28 2003-09-08 キヤノン株式会社 Heating equipment
US5722026A (en) * 1995-08-31 1998-02-24 Canon Kabushiki Kaisha Pressing rotator and heating-fixing apparatus using the same
JP3513283B2 (en) * 1995-09-28 2004-03-31 キヤノン株式会社 Image forming device
JPH09197861A (en) * 1995-11-13 1997-07-31 Sumitomo Electric Ind Ltd Heater and thermal fixing device with heater
US6469279B1 (en) 1996-03-07 2002-10-22 Canon Kabushiki Kaisha Image heating apparatus and heater
EP0797130B1 (en) * 1996-03-21 2001-10-10 Canon Kabushiki Kaisha Image heating apparatus
US6337928B1 (en) 1996-08-26 2002-01-08 Canon Kabushiki Kaisha Image transmission apparatus and method therefor
JP3769841B2 (en) * 1996-10-28 2006-04-26 住友電気工業株式会社 Heat fixing device
JPH10186920A (en) * 1996-12-24 1998-07-14 Canon Inc Fixing device
JP3450623B2 (en) * 1997-01-21 2003-09-29 キヤノン株式会社 Image forming device
JP3372811B2 (en) * 1997-02-03 2003-02-04 キヤノン株式会社 Heat fixing device
JPH10319774A (en) * 1997-05-14 1998-12-04 Canon Inc Image fixing device, its energizing method and image forming device used therewith
JPH1124492A (en) * 1997-07-03 1999-01-29 Canon Inc Thermal fixing device
JPH1195583A (en) * 1997-09-17 1999-04-09 Sumitomo Electric Ind Ltd Ceramic heater for fixing toner image
JPH11133803A (en) 1997-10-30 1999-05-21 Canon Inc Fixing device and image forming device
JP3780081B2 (en) * 1997-11-07 2006-05-31 キヤノン株式会社 Image forming apparatus
US6175699B1 (en) 1998-05-29 2001-01-16 Canon Kabushiki Kaisha Image fixing device with heater control
US6423941B1 (en) 1998-08-31 2002-07-23 Canon Kabushiki Kaisha Image heating apparatus and heater
DE69904793T2 (en) 1998-10-13 2003-10-02 Canon Kk Arrangements for heat fixation with an elastic, thermally highly conductive layer
JP3576845B2 (en) 1998-11-30 2004-10-13 キヤノン株式会社 Tube coating roller manufacturing method, tube coating roller, and heat fixing device having tube coating roller
JP3647290B2 (en) 1998-11-30 2005-05-11 キヤノン株式会社 Image heating apparatus and image forming apparatus
US6377777B1 (en) 1999-02-19 2002-04-23 Canon Kabushiki Kaisha Fluorine-containing resin-coated pressure roller and heat-fixing device
US6346800B1 (en) 1999-02-24 2002-02-12 Canon Kabushiki Kaisha Power supply device and fixing device operating with the power supply device
JP2000250340A (en) 1999-02-26 2000-09-14 Canon Inc Fixing device and image forming device
JP2000321895A (en) 1999-05-07 2000-11-24 Canon Inc Image heating device and image forming device
JP2001100575A (en) 1999-07-23 2001-04-13 Canon Inc Image heating device
JP4136210B2 (en) 1999-07-30 2008-08-20 キヤノン株式会社 Heating apparatus and image forming apparatus
JP3634679B2 (en) 1999-07-30 2005-03-30 キヤノン株式会社 Heating device
JP2001083822A (en) 1999-09-13 2001-03-30 Canon Inc Heating device, image heating device and image forming device
JP2001100586A (en) 1999-09-30 2001-04-13 Canon Inc Image forming device
US6459878B1 (en) 1999-09-30 2002-10-01 Canon Kabushiki Kaisha Heating assembly, image-forming apparatus, and process for producing silicone rubber sponge and roller
JP4592040B2 (en) 1999-11-11 2010-12-01 キヤノン株式会社 Power supply device for image forming apparatus, image forming apparatus using the same, and fixing device
JP2001215767A (en) 2000-02-07 2001-08-10 Canon Inc Color image forming device
EP1143303B1 (en) 2000-03-27 2007-01-10 Canon Kabushiki Kaisha Image forming method
JP2002031972A (en) 2000-05-10 2002-01-31 Sumitomo Electric Ind Ltd Ceramic heater for toner fixing device and method for manufacturing the same
JP2002033182A (en) 2000-05-10 2002-01-31 Canon Inc Heating device and image forming device
JP2002031976A (en) 2000-05-10 2002-01-31 Sumitomo Electric Ind Ltd Ceramic heater for toner fixing device and method for manufacturing the same
JP2001324892A (en) 2000-05-17 2001-11-22 Canon Inc Image heating device, and image forming device provided with the same
JP3631105B2 (en) 2000-05-31 2005-03-23 キヤノン株式会社 Fixing film and image heating apparatus using the same
JP2002015839A (en) 2000-06-29 2002-01-18 Canon Inc Heating element, heating device, and image-forming device
JP2002025752A (en) 2000-07-10 2002-01-25 Canon Inc Heater, heating device, and image-forming device
US6594456B2 (en) 2000-07-26 2003-07-15 Canon Kabushiki Kaisha Image forming apparatus
US6516166B2 (en) 2000-09-28 2003-02-04 Canon Kabushiki Kaisha Image fixing apparatus
JP2002139932A (en) 2000-11-01 2002-05-17 Sumitomo Electric Ind Ltd Thermal fixing device
JP4630447B2 (en) 2000-11-08 2011-02-09 キヤノン株式会社 Image forming apparatus
JP4659204B2 (en) 2000-11-24 2011-03-30 キヤノン株式会社 Fixing apparatus and image forming apparatus provided with the fixing apparatus
US6701102B2 (en) 2000-12-01 2004-03-02 Canon Kabushiki Kaisha Method and apparatus for controlling the temperature in a fixing device of an image forming apparatus
US6730878B2 (en) 2001-01-05 2004-05-04 Canon Kabushiki Kaisha Heater having electrically conductive substrate and image heating apparatus with heater
JP4474056B2 (en) 2001-01-31 2010-06-02 キヤノン株式会社 Heating device
JP3814542B2 (en) 2001-02-20 2006-08-30 キヤノン株式会社 Image heating device
JP4598970B2 (en) 2001-03-05 2010-12-15 キヤノン株式会社 Image forming apparatus
JP4125023B2 (en) 2001-03-13 2008-07-23 キヤノン株式会社 Fixing device
JP4748885B2 (en) * 2001-06-21 2011-08-17 株式会社リコー Belt fixing device and image forming apparatus
JP2003131502A (en) 2001-08-10 2003-05-09 Canon Inc Heater having imide base sliding layer and image heating device using the heater
JP3970122B2 (en) 2001-08-10 2007-09-05 キヤノン株式会社 Image heating apparatus having metal rotating body in contact with heater, rotating body, and method of manufacturing the rotating body
JP4261859B2 (en) 2001-10-09 2009-04-30 キヤノン株式会社 Image heating device
JP3870060B2 (en) 2001-10-12 2007-01-17 キヤノン株式会社 Image heating device
JP3826008B2 (en) 2001-10-15 2006-09-27 キヤノン株式会社 Image heating device
JP2003241549A (en) 2001-12-10 2003-08-29 Canon Inc Image heating apparatus
US6947699B2 (en) 2002-02-05 2005-09-20 Canon Kabushiki Kaisha Image heating apparatus with projection extending in longitudinal direction of supporting member
JP2003233264A (en) 2002-02-12 2003-08-22 Canon Inc Fixing device
JP2004006299A (en) 2002-04-22 2004-01-08 Canon Inc Heater having heat generating resistor on substrate, and image heating device using the same
US6929894B2 (en) 2002-07-10 2005-08-16 Canon Kabushiki Kaisha Toner and fixing method
JP3990957B2 (en) 2002-08-28 2007-10-17 キヤノン株式会社 Heat fixing device
JP4323911B2 (en) * 2002-10-18 2009-09-02 キヤノン株式会社 Fixing device
US7031624B2 (en) 2002-10-21 2006-04-18 Canon Kabushiki Kaisha Image formation apparatus for providing a predetermined temperature lowering period in which the temperature of a fixing unit is reduced
JP2004144833A (en) 2002-10-22 2004-05-20 Canon Inc Heating device
JP2004170950A (en) 2002-11-06 2004-06-17 Canon Inc Image heating device
JP4095406B2 (en) 2002-11-06 2008-06-04 キヤノン株式会社 Heat fixing device
JP4290015B2 (en) 2003-01-10 2009-07-01 キヤノン株式会社 Color toner and image forming apparatus
US7076183B2 (en) 2003-01-21 2006-07-11 Canon Kabushiki Kaisha Image fusing device and image forming apparatus
JP2004281286A (en) * 2003-03-18 2004-10-07 Canon Inc Heating device
US7218873B2 (en) 2003-03-31 2007-05-15 Canon Kabushiki Kaisha Image generating apparatus
JP4454972B2 (en) 2003-06-30 2010-04-21 キヤノン株式会社 Image forming apparatus
JP2005032455A (en) 2003-07-07 2005-02-03 Canon Inc Heating device and image forming apparatus
JP2005107237A (en) 2003-09-30 2005-04-21 Canon Inc Image forming apparatus
JP4599176B2 (en) 2004-01-23 2010-12-15 キヤノン株式会社 Image heating apparatus and heater used in the apparatus
JP2005242333A (en) 2004-01-30 2005-09-08 Canon Inc Image heating apparatus provided with flexible sleeve
JP2005242321A (en) 2004-01-30 2005-09-08 Canon Inc Image heating apparatus using roller provided with heat insulation layer consisting of porous ceramics material
JP4594125B2 (en) 2004-02-20 2010-12-08 キヤノン株式会社 Image fixing device
JP4262119B2 (en) 2004-02-27 2009-05-13 キヤノン株式会社 Image forming apparatus
JP2005316443A (en) 2004-03-30 2005-11-10 Canon Inc Image-heating device and conveyance roller used for the device
JP4280664B2 (en) 2004-03-31 2009-06-17 キヤノン株式会社 Image heating device
JP2006023377A (en) 2004-07-06 2006-01-26 Canon Inc Image forming apparatus
JP2006084821A (en) 2004-09-16 2006-03-30 Canon Inc Heat fixing apparatus
JP4614382B2 (en) 2004-10-29 2011-01-19 キヤノン株式会社 Power supply apparatus, heating apparatus, and image forming apparatus
JP2006163298A (en) 2004-12-10 2006-06-22 Canon Inc Color image forming apparatus
JP2007025237A (en) 2005-07-15 2007-02-01 Ricoh Co Ltd Fixing device and image forming apparatus
JP4890821B2 (en) 2005-09-13 2012-03-07 キヤノン株式会社 Image forming apparatus
JP4857774B2 (en) 2006-01-17 2012-01-18 富士ゼロックス株式会社 Fixing device
JP4795039B2 (en) 2006-02-03 2011-10-19 キヤノン株式会社 Fixing device
JP4498369B2 (en) 2006-02-14 2010-07-07 キヤノン株式会社 Image heating apparatus and flexible sleeve used in the image heating apparatus
JP5100061B2 (en) 2006-08-24 2012-12-19 キヤノン株式会社 Fixing apparatus and image forming apparatus
JP5309457B2 (en) * 2007-03-16 2013-10-09 富士ゼロックス株式会社 Fixing apparatus and image forming apparatus
JP5464902B2 (en) 2008-05-30 2014-04-09 キヤノン株式会社 Fixing device
JP2010102305A (en) 2008-09-24 2010-05-06 Canon Inc Image forming apparatus
JP5225134B2 (en) 2009-02-09 2013-07-03 キヤノン株式会社 Image heating device
WO2010114150A1 (en) 2009-03-30 2010-10-07 キヤノン株式会社 Image forming system and image forming apparatus
JP5473416B2 (en) * 2009-06-10 2014-04-16 キヤノン株式会社 Image forming apparatus
US8331819B2 (en) 2009-06-11 2012-12-11 Canon Kabushiki Kaisha Image forming apparatus
JP5479025B2 (en) 2009-10-27 2014-04-23 キヤノン株式会社 Image heating apparatus and image forming apparatus
JP2012013868A (en) * 2010-06-30 2012-01-19 Canon Inc Heating apparatus
JP2012123244A (en) 2010-12-09 2012-06-28 Canon Inc Image forming apparatus
JP5744497B2 (en) 2010-12-09 2015-07-08 キヤノン株式会社 Image forming apparatus
JP4918164B2 (en) * 2011-01-26 2012-04-18 株式会社リコー Belt fixing device and image forming apparatus
JP6025405B2 (en) 2012-06-04 2016-11-16 キヤノン株式会社 Belt changing unit and belt changing method
JP6173040B2 (en) 2013-05-23 2017-08-02 キヤノン株式会社 Fixing belt and fixing device
JP6395488B2 (en) 2014-07-28 2018-09-26 キヤノン株式会社 Fixing device

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5016936A (en) * 1973-06-15 1975-02-22
JPS5968766A (en) * 1982-10-13 1984-04-18 Olympus Optical Co Ltd Heat fixation device
IT1212977B (en) * 1983-02-10 1989-12-07 Olivetti & Co Spa A copying machine elettrofotogra Pussy

Also Published As

Publication number Publication date
JPH02157878A (en) 1990-06-18

Similar Documents

Publication Publication Date Title
JP2884714B2 (en) Image heating device
JP2861280B2 (en) Heating equipment
JP3033486B2 (en) Fixing method and apparatus
JP4944987B2 (en) Image forming method
JP2900604B2 (en) Image heating device
JP2884717B2 (en) Image heating device
JP2884715B2 (en) Image heating device
JP2884716B2 (en) Image heating device
EP0372479B2 (en) An image fixing apparatus
JP2884718B2 (en) Image heating device
DE69931999T3 (en) image fixing apparatus
JP4095406B2 (en) Heat fixing device
US6944420B2 (en) Image heating apparatus with flexible sleeve and flange members in contact with the sleeve
KR930011439B1 (en) Image fixing apparatus
JP2940077B2 (en) Heating equipment
US5043763A (en) Image forming apparatus having a heater in contact with a film to fix a toner image
US5162634A (en) Image fixing apparatus
JP4654704B2 (en) Fixing apparatus and image forming apparatus
JP3450623B2 (en) Image forming device
US7457557B2 (en) High precision-heating and fusing apparatus
JP2012168434A (en) Fixing device and image forming apparatus
US20090208265A1 (en) Image heating device
JP4298272B2 (en) Fixing apparatus and image forming apparatus
US4242566A (en) Heat-pressure fusing device
US5852763A (en) Image heating apparatus

Legal Events

Date Code Title Description
LAPS Cancellation because of no payment of annual fees