JP2000338801A - Heating device and image forming device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a heating device constituted so that slip is prevented from occurring at a driving start time and such failure that a warm-up time is prolonged and a rotary body such as a film and a moving body are damaged is prevented from occurring even after paper is passed in a long term and even under low-temperature environment by heating a moving member before driving it to be moved. SOLUTION: When the action start signal of a fixing unit 100 is received, an alternating current being half of a rated current is made to flow to the coil 3 of the unit 100 and the film 1 is preliminarily heated. Next, the temperature of the film 1 is detected by a film temperature detection means 11 and the film 1 is preliminarily heated until the temperature thereof arrives at prescribed temperature. When the temperature of the film 1 arrives at the prescribed temperature, a pressure roller 5 is driven to be rotated counterclockwise like it is shown by an arrow by a driving means M. That means, the temperature of the film 1 is raised by being heated as the preliminary heating and the temperature of a slide member 10 and grease are raised before driving and rotating the unit 100 (driving the roller 5 and rotating the film 1) so that slidability is enhanced.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image forming apparatus such as an electrophotographic apparatus and an electrostatic recording apparatus, and a heating apparatus (fixing apparatus) used for the apparatus.

[0002]

2. Description of the Related Art Conventionally, as a heating device represented by a heat fixing device, a heat roller type device has been widely used.

[0003] The heat roller system basically comprises a pressure roller pair of a fixing roller (heating roller) and a pressure roller, and rotates the roller pair to form a fixing (heating) nip as a mutual pressure contact portion of the roller pair. The recording material on which the unfixed image is formed is introduced into the unit, and the recording material is nipped and conveyed. The unfixed image is hot-pressed and fixed on the recording material by the heat of the fixing roller and the pressing force of the fixing nip.

The fixing roller generally has a hollow metal roller made of aluminum as a base (metal core), and a halogen lamp as a heat source is inserted and disposed in the hollow space thereof. The power supply to the halogen lamp is controlled to control the temperature so that the predetermined fixing temperature is maintained.

On the other hand, JP-A-63-313182,
JP-A-2-15778, JP-A-4-44075
Japanese Patent Application Laid-Open No. 4-204980 discloses a fixing device of a film heating system. This is because a heat-resistant film (fixing film) is sandwiched between a heating element such as a ceramic heater and a pressing roller as a pressing member to form a nip portion, and the film in the nip portion and the pressing roller are formed. The recording material on which an unfixed toner image to be fixed is formed is introduced, and the recording material is nipped and conveyed together with the film, so that the heat of the ceramic heater is applied to the recording material via the film in the nip portion. And fixing the unfixed toner image on the surface of the recording material by heat and pressure with the pressing force of the nip portion. This film heating type fixing device can be configured using a ceramic heater and a member having a low heat capacity as a film, and compared to the heat roller type, the waiting time from when the power of the image forming apparatus is turned on to when the image forming is executable can be performed. This makes it possible to reduce power consumption during standby.

Japanese Patent Application Laid-Open No. 7-114276 discloses an induction heating fixing device in which a current is induced in a fixing film by magnetic flux and heat is generated by Joule heat. This makes it possible to directly generate heat in the fixing film by utilizing the generation of the induced current, thereby achieving a more efficient fixing process.

On the other hand, as a driving method of the film-type fixing device, there are a method of driving a pressure roller and rotating the film by a frictional force at a nip portion (hereinafter referred to as a pressure roller driving method), and a method of driving the film. A system in which a film is directly driven by a driving roller provided therein has been devised.

[0008]

With respect to the above-mentioned film-type fixing device, there is a problem of improving the slidability with a film holder when the film is rotationally driven. Especially when starting up the equipment after long-term paper passing in a low temperature environment,
Slip (stop) sometimes occurred between the pressure roller and the film. This is because the slidability of the film and the film holder at low temperature is poor, and the number of sheets passed through using the fixing device for a long time increases, the sliding surface deteriorates, and the slidability deteriorates. This is probably because the rotational torque of the film increased. That is, a sliding member (a member having a low coefficient of friction, a lubricant such as grease, etc.) used between the film and the film holder has a different sliding property depending on the temperature, and generally has a lower sliding property under a low temperature environment than at a high temperature. . Further, the rotational driving torque tends to increase due to durability due to deterioration of slidability due to deterioration of the sliding member during long-term paper passing. Therefore, the slip is particularly severe at the time of startup from a low temperature after long-time paper passing, and in some cases, the slip may occur.

[0009] The occurrence of the slip causes a problem that the film is not normally rotated and the warm-up time until the entire fixing device including the pressure roller is heated to the fixing temperature becomes long. In particular, when the heating area extends outside the nip, the temperature rise outside the nip is large, which may cause damage to the film.

[0010] Therefore, an object of the present invention is to provide a long-time paper feed,
A heating device and an image forming apparatus capable of preventing slip at the start of driving even in a low-temperature environment, and prolonging a warm-up time and preventing a failure such as damage to a rotating or moving body such as a film. Is to provide.

[0011]

Means for Solving the Problems A heating device and an image forming apparatus according to the present invention have the following constitutions in order to solve the above-mentioned problems.

[1] In a heating device having a moving member that slides and moves on a sliding support member and heats a material to be heated by heat from the moving member side, before the moving member is driven to move, A heating device for heating the moving member.

[2]: A moving member that slides and moves on the sliding support member, and a pressing member that forms a pressing nip portion by mutually pressing the moving member, and is heated by the pressing nip portion. What is claimed is: 1. A heating apparatus for heating a material to be heated by heat from a moving member side by nipping and conveying a member, wherein the moving member is heated before the moving member is driven to move.

[3] The heating device according to [1] or [2], wherein the moving member is a rotating body and is heated by energization.

[4]: The rotating body includes a rotating body made of a film, a sliding support member for supporting the rotating body on a sliding surface, and a pressing member pressed against the rotating body. Is heated by energization, and in a heating device for nipping and transporting the material to be heated between the rotating body and the pressing member to pressurize and heat the material to be heated, before rotating the rotating body, To
A heating device for heating the rotating body.

[5]: The apparatus has a magnetic field generating means, an electromagnetic induction heating rotator for generating heat by the action of the magnetic field of the magnetic field generating means, and a pressing member pressed against the rotator. A heating device for heating and heating the material to be heated by pressing and heating the material to be heated between the rotating body and the pressing member; A heating device for heating the rotating body before.

[6] The heating device according to [4] or [5], further comprising a temperature detecting means, wherein the rotation of the rotating body is started after the detected temperature reaches a predetermined temperature or higher.

[7] The heating device according to [4], [5] or [6], wherein a plurality of heating means for heating the rotating body are provided.

[8] The method according to any one of [4] to [7], wherein the heating temperature of the rotating body to be heated before the driving of the rotating body is changed depending on the use condition. Heating equipment.

[0020]

[9] The heating device according to any one of [4] to [8], wherein the rotating body is driven by a pressing member.

[10]: Image forming means for forming an image on a recording material, and heating the image on the recording material [1] to

[9] An image forming apparatus comprising: the heating device according to any one of [9].

[11]: an image carrier as a member to be charged;
Charging means for charging the image carrier, exposure means for exposing the image carrier to form an electrostatic latent image, developing means for forming a toner image by attaching toner to the electrostatic latent image, Transfer means for transferring the toner image on the image carrier to a recording material,
A fixing unit for fixing the toner image transferred to the recording material to a permanent fixed image, wherein the fixing unit is [1] to

[9] An image forming apparatus comprising the heating device according to any one of [9].

<Operation> By configuring as described above,
Since the rotator (moving member) is heated before being driven and the slidability with the support member is improved before starting the driving, even after a long period of paper passing or when starting up from a low temperature environment, The torque at the start of driving can be reduced, slip can be prevented, and problems such as prolonged warm-up time and film breakage can be prevented.

[0024]

DESCRIPTION OF THE PREFERRED EMBODIMENTS First Embodiment FIG. 9 is a sectional view of an image forming apparatus in which an image heating apparatus according to an embodiment of the present invention is used as a fixing device of a four-color image forming apparatus.

§1. First, the operation of the image forming apparatus will be described below. Reference numeral 101 denotes an electrophotographic photosensitive drum (image carrier) made of an organic photosensitive member or an amorphous silicon photosensitive member, and is rotated at a predetermined process speed (peripheral speed) in a counterclockwise direction indicated by an arrow.

The photosensitive drum 101 undergoes a uniform charging process of a predetermined polarity and potential by a charging device 102 such as a charging roller during the rotation process.

Next, a laser beam 103 output from a laser optical box (laser scanner) 110 is provided on the charged surface.
And scanning exposure processing of the target image information. The laser optical box 110 outputs laser light 103 modulated (on / off) in response to a time-series electric digital pixel signal of target image information from an image signal generator such as an image reader (not shown), and The drum surface is subjected to scanning exposure, and the scanning exposure forms an electrostatic latent image corresponding to the target image information scanned and exposed on the rotating photosensitive drum 101 surface. 1
A mirror 09 deflects the output laser light from the laser optical box 110 to the exposure position of the photosensitive drum 101.

In the case of full-color image formation, scanning exposure and latent image formation are performed on a first color-separated component image of a target full-color image, for example, a yellow component image. Is developed as a yellow toner image by the operation of the yellow developing device 104Y. The yellow toner image is transferred to the surface of the intermediate transfer drum 105 at a primary transfer portion T1, which is a contact portion (or a close portion) between the photosensitive drum 101 and the intermediate transfer drum 105. After the transfer of the toner image to the surface of the intermediate transfer drum 105, the surface of the rotating photoconductor drum 101 is cleaned by the cleaner 107 after removing the adhered residue such as untransferred toner.

The above-described process cycle of charging, scanning exposure, development, primary transfer, and cleaning is performed by the second color separation component image of the target full-color image (for example, the magenta component image, the magenta developing device 104M is activated), The three color component images (for example, the cyan component image and the cyan developing device 104C are activated) and the fourth color component image (for example, the black component image and the black developing device 104BK are activated) are sequentially executed for each color separation component image. A toner image of four colors, a yellow toner image, a magenta toner image, a cyan toner image, and a black toner image, is sequentially superimposed on the surface of the transfer drum 105 and transferred, and a color toner image corresponding to a target full-color image is synthesized. .

The intermediate transfer drum 105 has a medium-resistance elastic layer and a high-resistance surface layer on a metal drum.
The photosensitive drum 101 is rotated in the clockwise direction indicated by an arrow at substantially the same peripheral speed as the photosensitive drum 101 in contact with or close to the photosensitive drum 101, and applies a bias potential to the metal drum of the intermediate transfer drum 105 to cause the photosensitive drum 101 to rotate. The toner image on the photosensitive drum 101 side is transferred to the intermediate transfer drum 10
Transfer to the 5th side.

The color toner image synthesized and formed on the surface of the intermediate transfer member 105 is
In the secondary transfer portion T2, which is a contact nip portion between the recording material P and the transfer roller 106, the image is transferred to the surface of the recording material P sent to the secondary transfer portion T2 from a paper supply unit (not shown) at a predetermined timing. . The transfer roller 106 supplies a charge having a polarity opposite to that of the toner from the rear surface of the recording material P, thereby sequentially transferring the combined color toner images collectively from the surface of the intermediate transfer drum 105 to the recording material P.

The recording material P that has passed through the secondary transfer portion T2 is separated from the surface of the intermediate transfer drum 105, introduced into the image heating device (fixing device) 100, and subjected to the heat fixing process of the unfixed toner image. The sheet is discharged to a discharge tray (not shown) outside the apparatus as a color image formed product. The fixing device will be described later in detail.

After the transfer of the color toner image onto the recording material P, the rotating intermediate transfer drum 105 is cleaned by the cleaner 108 by removing the adhered residues such as untransferred toner and paper dust. The cleaner 108 is held in a non-contact state with the intermediate transfer drum 105 in a normal process, and during the secondary transfer process of the color toner image from the intermediate transfer drum 105 to the recording material P, the intermediate transfer drum 105 is kept in contact.

The transfer roller 106 is always kept in a non-contact state with the intermediate transfer drum 105, and during the secondary transfer of the color toner image from the intermediate transfer drum 105 to the recording material P, the intermediate transfer member Drum 10
5 is held in contact with the recording material P via the recording material P.

§2. Schematic Configuration of Heating Device (Fixing Device) Next, the fixing device will be described.

FIG. 1 is a schematic cross-sectional view of a main part of the fixing device 100 of the present embodiment, FIG. 2 is a front schematic view of the main part, and FIG.

The apparatus 100 of this embodiment is an apparatus of a pressure roller drive system and an electromagnetic induction heating system using a cylindrical electromagnetic induction heating film.

As shown in FIG. 4, an endless fixing film 1 as a rotating body includes a heat generating layer 1a made of a metal film or the like serving as a base layer of an electromagnetic induction heat generating fixing film.
It has a three-layer composite structure of an elastic layer 1b laminated on its outer surface and a release layer 1c laminated on its outer surface. Heat generation layer 1a
It is preferable to use a ferromagnetic metal such as nickel, iron, ferromagnetic SUS, nickel-cobalt alloy,
The thickness is preferably 1 to 100 μm in view of the relationship between the absorption efficiency of electromagnetic energy and the rigidity of the film. The elastic layer 1b
When a color image or the like is fixed, the heating surface (release layer 1c) follows the unevenness of the recording material P or the unevenness of the toner layer to prevent gloss unevenness of the image. Fluorine rubber, fluorosilicone rubber, etc. having good heat resistance and good thermal conductivity are used.
Up to 500 µm, hardness 60 ° (JIS-KA type A testing machine)
It is preferable to set the following. The release layer 1c has a thickness of 1 to 10
0 μm fluororesin, silicone resin, fluorosilicone rubber, fluororubber, silicone rubber, PFA, PT
A material having good releasability and heat resistance such as FE and FEP is used. Although not shown in this example, a heat-resistant resin such as a fluorine resin, a polyimide resin, a polyamide resin, a PEEK resin, a PES resin, a PPS resin, a PFA resin, a PTFE resin, and a FEP resin is provided inside the heating layer 1a. A heat insulating layer may be provided to further increase the efficiency of heat supply to the recording material P.

The film guide member 2 is made of phenol resin, polyimide (PI) resin, polyamide resin, polyamide imide resin, PEEK resin, PES resin, PPS resin, P
A material having good insulation and heat resistance, such as FA resin, PTFE resin, FEP resin, and LCP resin, is used.
And the magnetic core 4, the fixing film 1, and the transport stability of the film 1 during rotation.

The sliding member 10 disposed between the film 1 and the film guide 2 in the nip portion N is for improving the slidability between the film 1 and the film guide 2.
A material having excellent heat resistance and good slidability with a film, such as I or alumina coated with glass, is used. Further, in order to further improve the slidability, a lubricant such as grease is applied to the inner surface of the film 1 in addition to the sliding member 10. (Although it depends on the film diameter and the shape of the film guide, the sliding portion of the film and the film guide generally has large friction at the nip (N in the figure) and at the nip upstream (S in the figure). The excitation coil 3 forms a coil (wire loop) by bundling a plurality of thin copper wires, each of which is insulated and coated, and winding the bundle wire a plurality of times. It is connected. In this example, polyimide is used as the heat-resistant insulating film, the number of turns is eight (8 turns), and the coil is formed and arranged along the film guide 2 and heated in a large area. Is made possible. The diameter of the thin wire, the cross-sectional area of the bundle, and the like are determined by the amount of current flowing through the exciting coil 3. In this example, 98 thin wires having a diameter of 0.2 mm are bundled (the cross-sectional area of the bundle is approximately 3.1 mm ^2). )
Is used.

The magnetic core 4 is a high magnetic permeability core having a T-shaped cross section, and is made of a material such as ferrite or permalloy used for the core of the transformer (more preferably, 100%).
Ferrite with low loss even at kHz or higher is used.

The temperature detecting member 11 detects the temperature of the fixing film, and a temperature sensor such as a thermistor is disposed on the inner side of the fixing film downstream of the fixing nip in the rotational direction as shown in the figure. ing.

The pressing roller 5 as a pressing member includes a core 5
a, and a heat-resistant and elastic material layer 5b of silicone rubber, fluorine rubber, fluororesin, or the like, which is formed and coated around the cored bar. Both ends of the cored bar 5a are connected to a chassis (not shown) of the apparatus. The bearings are rotatably held between sheet metals. Further, as shown in FIGS. 2 and 3, a heating device comprising a film 1, a film guide 2, an exciting coil 3, an exciting core 4, a pressurizing rigid stay 6, and flange members 7a and 7b is provided above the pressing roller 5. Means units are arranged, and pressurizing springs 9a and 9b are respectively contracted between both ends of the rigid pressurizing stay 6 and spring receiving members 8a and 8b on the apparatus chassis side to push down the rigid pressurizing stay 6. The force is acting. As a result, the lower surface of the film guide 2 and the upper surface of the pressure roller 5 are pressed against each other with the fixing film 1 and the sliding member 10 interposed therebetween to form a fixing nip portion N having a predetermined width.
Due to the contact at the nip portion, the film is rotationally driven together with the driving of the pressure roller.

The principle of heating is as follows.

An alternating magnetic flux is generated by flowing an alternating current of 20 kHz to 500 kHz from an exciting circuit (not shown) to the exciting coil 3. The alternating magnetic flux generates an eddy current in the heat generating layer 1a of the fixing film 1, and the eddy current generates Joule heat due to the specific resistance of the heat generating layer 1a. The generated heat is applied to the recording material P nipped and conveyed to the nip portion N via the elastic layer 1b and the release layer 1c, and the toner t on the recording material P.
Heat.

§3. Next, drive control of the fixing device will be described.

FIG. 5 is a flowchart showing a control method of the fixing device according to the present embodiment.

As shown in FIG. 5, when the operation start signal of the fixing device is received, an alternating current of half the rated current is first applied to the coil of the fixing device (while the film and the pressure roller are stopped). The film is preheated. Next, the film temperature is detected by the film temperature detecting means 11, and preheating is performed until the film temperature reaches a predetermined temperature. When the film temperature reaches a predetermined temperature (80 ° C in this example),
In response to the rotation drive start command, the pressure roller is driven to rotate in the counterclockwise direction indicated by the arrow by the driving means M. The pressure roller 5 and the fixing film 1 are driven by the rotation of the pressure roller 5.
A rotating force acts on the fixing film 1 by a frictional force with the outer surface of the fixing roller 1, and the inner surface of the fixing film 1 adheres to the lower surface of the sliding member 10 and the film guide 2 while the pressing roller 5 It rotates around the film guide 2 at a peripheral speed substantially corresponding to the rotational speed. Then, the temperature is controlled by controlling the alternating current to the coil so that the predetermined fixing temperature is obtained.

By adopting such a configuration, even at the time of startup from a low temperature environment after a long period of paper passing, torque at the start of driving can be reduced to ensure slidability, and slip can be reduced. This can be prevented. That is, before the rotation drive of the fixing device (pressure roller drive, film rotation),
By heating the film as preheating, the temperature of the film is increased, and the temperatures of the sliding member 10 and the grease are increased, thereby improving the slidability. In this example, since a member having good thermal conductivity (for example, when nickel is used for the heat generating layer: thermal conductivity k = 83 W · m ⁻¹ · K ⁻¹ ) is used as the film, heat generated by the heating operation or Due to the heat transfer, the nip upstream sliding portion S and the nip sliding portion N
And the sliding property of the film is improved. As a result, the rotation torque of the film by the pressure roller can be reduced, and slip can be prevented. Therefore, even in the case of starting up from a low temperature environment due to long-term paper passing, slip can be prevented, and problems such as prolonged warm-up time and film breakage can be prevented.

Table 1 shows that the fixing device 100 of the present example operates at 200K.
The result of measuring the torque at the start of driving when starting up from a low temperature environment after image durability (after passing 200,000 sheets) is shown. As a comparative example, an example in which preheating is not performed in the fixing device 100 will be described.

[0051]

[Table 1]

As can be seen from this table, the driving start torque when preheating is not performed is 15 to 25 kgf ·
cm, in some cases a slip occurred,
The driving start torque of the fixing device of this example was 8 kgf, and no slip occurred.

Therefore, by performing preheating as in this example, even after long-time paper feeding, it is possible to prevent the occurrence of a slip in the morning, and to prevent a problem such as a prolonged warm-up time and film breakage. Can be prevented.

In this embodiment, the preheating is performed according to the fixing device operation start command. However, the preheating is performed according to the temperature, the configuration of the fixing device (film, sliding member, pressure roller, etc.), and the use condition. May be used. That is, the fixing device may be configured to perform preheating after use for a predetermined period of time without using preheating in the initial stage of endurance, or to set a film temperature serving as a target of preheating to an external environmental temperature or use time. It is good also as composition which changes, such as raising according to it.

Also, instead of detecting the film temperature,
After receiving the start-up signal of the fixing device, a pre-heating for a predetermined time (constant time) may be performed, and then the rotation driving may be started.

<Second Embodiment> FIG. 6 is a schematic cross-sectional view of a main part of a fixing device according to a second embodiment of the present invention.

In this embodiment, the coil and the core are deformed so that the heat generation peak portion comes to the nip portion N. The heat generation layer of the film 1 is mainly formed by the coil 13 and the core 14 at the nip portion N. An eddy current is generated in 1a, and intensive heating is performed.

In this embodiment, preheating is performed in the same manner as in the first embodiment.

By adopting such a configuration, it is possible to prevent the occurrence of slip even when starting up from a low temperature after a long period of paper passing. In other words, preheating increases the temperature of the film and the sliding member before the start of rotation, thereby reducing the rotation torque. Occurrence can be prevented.

Further, in the fixing device of the present embodiment, since the nip portion is a heat generation peak portion, the nip portion temperature can be increased in a shorter time, and the slidability can be improved.

<Third Embodiment> FIG. 7 is a schematic cross-sectional view of a main part of a film heating apparatus according to a third embodiment.

In this embodiment, a pressure roller 15 having a halogen heater 15c disposed on the inner surface is used instead of the pressure roller 5 of the first embodiment.

FIG. 8 is a flowchart showing a control method of the fixing device according to the present embodiment.

In this embodiment, the halogen heater 15c in the pressure roller 15 is first energized by the fixing operation start command, and the pressure roller is heated until it reaches a predetermined temperature.
When the pressure roller temperature reaches a predetermined temperature T (60 ° C. in this example), energization of the halogen heater 15c is stopped, rotation is started by the driving unit M, and the coil 3 is turned off.
, An alternating current is supplied, and the temperature is adjusted to a predetermined fixing temperature.

With the above configuration, even at the time of startup from a low temperature after long-time paper passing, occurrence of slip can be prevented.

That is, the temperature of the pressure roller 15 is increased by the heating of the pressure roller 15, and the film 1 is heated by the pressure roller 15, so that the humidity of the sliding portion is increased. Therefore, the slidability of the film 1 is improved, and the rotation torque can be reduced. As a result, even at the time of startup from a low temperature after long-time paper passing, slip can be prevented.

Further, in the case of this embodiment, since the pressure roller itself can be heated by the heater 15c, the start-up time can be further shortened.

In this embodiment, the heating of the pressure roller 15
Although the film 1 is configured to be heated, a member for heating the film sliding portion may be newly provided outside or inside the film 1. After the fixing device operation start command, the coil 3 may be energized to perform heating by electromagnetic induction and heating of the pressure roller 15 by the halogen lamp 15c at the same time.

<Others> (1) In the above embodiment, a configuration is adopted in which a magnetic force is applied to the rotating body (moving member) to generate heat. However, the present invention is not limited to this, and is shown in FIG. As described above, the conductive member 3
The configuration may be such that the magnetic force generated by the magnetic flux generating means 31b acts on 1a to generate heat. In this embodiment, the conductive member 31a and the magnetic flux generating means 31b are connected to the film guide 2
8, a cylindrical heat-resistant film 20 is externally fitted to the film guide 28, and a grease 29 is provided between the film 20 and the film guide 28. Note that the film guide 28 and the conductive member 31a are the sliding support members of this example.

When the recording paper P carrying the unfixed image is passed between the film 20 and the pressure roller 5, the heat from the conductive member 31a is transferred through the recording paper P through the film 20. P is applied and fixing is performed. Also in the present embodiment, by heating the conductive member 31a and heating the film 20 before the film 20 is driven to rotate, the torque at the start of driving can be reduced, and the same effect as in the above-described embodiment can be obtained.

(2) In the above embodiment, an example using electromagnetic induction heating is described. However, the present invention is not limited to this, and a configuration using a so-called ceramic heater having a resistance heating element provided on a substrate may be used. For example, the conductive member 31a shown in FIG.
Instead of the magnetic flux generating means 31b, as shown in FIG. 10B, a heater 21 having a resistance heating element 21b provided on the back surface (surface opposite to the material to be heated) of a substrate 21a such as aluminum nitride is used. May be.

(3) In the above embodiment, the example of the pressure roller driving type is shown, but the invention is not limited to this, and the rotating body (moving member)
May slide on the support member. For example, FIG.
As shown in FIG. 0 (c), the film 1 is
The drive roller 32 and the tension roller 33 are wound and stretched so that the grease 29 is provided between the sliding member 10 and the film 1.
Is applied, the film is transported by driving the drive roller 32 with a stepping motor, and the pressure roller 22 is driven by the film.

(4) The moving member is not limited to the above-mentioned rotating body, but can be wound on the winding shaft 43 by sliding on the sliding member 10 from the feeding shaft 42 as shown in FIG. May be an edged film that moves to

[0074]

As described above, according to the present invention,
Even after a long period of paper passing or in a low-temperature environment, it is possible to prevent slippage at the start of driving, prevent a longer warm-up time, and prevent problems such as damage to a rotating or moving body such as a film. A heating device and an image forming device can be provided.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a heating device according to a first embodiment.

FIG. 2 is a schematic front view of the heating device according to the first embodiment.

FIG. 3 is a longitudinal sectional view of the heating device according to the first embodiment;

FIG. 4 is a schematic diagram of a layer structure of a fixing film.

FIG. 5 is a flowchart illustrating a control method of the heating device according to the first embodiment.

FIG. 6 is a cross-sectional view of a heating device according to a second embodiment.

FIG. 7 is a cross-sectional view of a heating device according to a third embodiment.

FIG. 8 is a flowchart illustrating a control method of the heating device according to the third embodiment.

FIG. 9 is a schematic configuration diagram of an image forming apparatus.

FIG. 10 is a schematic configuration diagram showing another embodiment.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 film 1 a heat generating layer 1 b elastic layer 1 c release layer 2 film guide 3 coil 4 magnetic core 5 pressure roller 5 a cored bar 5 b heat-resistant / elastic material layer 6 pressurized rigid stay 7 a, 7 b flange member 8 a member 9 a, 9 b Pressure spring 10 sliding member 11 temperature detecting member 13 coil 14 core 15 pressure roller 15c heater 100 fixing device 101 photosensitive drum 102 charging device 103 laser beam 104Y yellow developing device 104C cyan developing device 104M magenta developing device 104BK black developing device 104 Color color developing device 105 Intermediate transfer drum 106 Transfer roller 107, 108 Cleaner 110 Laser optical box N Fixing nip P Recording paper (recording material)

 ────────────────────────────────────────────────── ─── Continued on front page (72) Inventor Takashi Nomura 3-30-2 Shimomaruko, Ota-ku, Tokyo F-term in Canon Inc. (reference) 2H033 AA30 BA30 BB37 BE03 BE06 CA07 CA20 CA22 CA28 CA30 CA40 3K058 AA02 AA22 BA18 CA12 CA23 CA46 CA61 CE13 CE17 CE19 CE21 DA02 DA05 GA06 3K059 AB00 AB19 AB20 AB28 AC10 AC33 AC54 AC73 AD03 AD07 AD34 BD02 CD13 CD14 CD44 CD66 CD77

Claims (11)

[Claims] 1. A heating device having a moving member that slides and moves on a sliding support member and heats a material to be heated by heat from the moving member side, wherein the moving member is moved before the moving member is driven. A heating device for heating a member. 2. A moving member which slides and moves on a sliding support member, and a pressurizing member which forms a press contact nip portion by mutual press contact with the move member, wherein a member to be heated is pressed by the press contact nip portion. What is claimed is: 1. A heating apparatus for heating a material to be heated by heat from a moving member side by nipping and conveying, wherein the moving member is heated before the moving member is driven to move. 3. The heating device according to claim 1, wherein the moving member is a rotating body, and is heated by energization. 4. A rotating body made of a film, a sliding support member for supporting the rotating body on a sliding surface, and a pressing member for pressing the rotating body, wherein the rotating body is energized. In a heating device that pressurizes and heats the material to be heated by nipping and transporting the material to be heated between the rotating body and the pressing member, before rotating the rotating body, A heating device for heating the rotating body. 5. A magnetic field generating means, comprising: an electromagnetic induction heat generating rotating body that generates heat by the action of a magnetic field of the magnetic field generating means; and a pressing member that is pressed against the rotating body. In a heating device which is heated by energization and pressurizes and heats the material to be heated by sandwiching and transporting the material to be heated between the rotating body and the pressing member, before rotating the rotating body, A heating device for heating the rotating body. 6. The heating device according to claim 4, further comprising a temperature detecting means, wherein the rotation driving of the rotating body is started after the detected temperature becomes equal to or higher than a predetermined temperature. 7. The heating device according to claim 4, further comprising a plurality of heating means for heating the rotating body. 8. A heating temperature of a rotating body to be heated before driving the rotating body is changed according to a use situation.
The heating device according to claim 4. 9. The heating device according to claim 4, wherein the rotating body is driven by a pressing member. 10. An image forming means for forming an image on a recording material, and the heating device according to claim 1 for heating the image on the recording material. Image forming apparatus. 11. An image carrier as a member to be charged, charging means for charging the image carrier, exposure means for exposing the image carrier to form an electrostatic latent image, and the electrostatic latent image Developing means for forming a toner image by adhering toner onto the recording medium, transferring means for transferring the toner image on the image carrier to a recording material, and fixing means for making the toner image transferred to the recording material a permanent fixed image An image forming apparatus comprising: the heating device according to any one of claims 1 to 9 as the fixing unit.