JP3123339B2 - Heating equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heating device of a film heating type, that is, a heating device which generates heat by energization, and a film member which slides in close contact with the heating member. about the heating equipment to be applied to the thermal energy through the film member material to be heated of the heating body by moving the heater position is heated portion with the film member is brought into close contact with the material to be heated in the heating body.

[0002]

2. Description of the Related Art For example, copying machines, laser beam printers, facsimile machines, microfilm reader printers,
In an image forming apparatus such as an image display (display) apparatus or a recording machine, the image forming apparatus such as an electrophotographic apparatus, an electrostatic recording apparatus, or a magnetic recording apparatus is used. Recording materials (transfer material sheets, electrofax sheets, electrostatic recording sheets, printing paper, etc.)
Image heating device (image heat fixing device) that heats and fixes an unfixed toner image corresponding to the target image information formed and supported on the surface of the recording material in an indirect (transfer) method or a direct method as a permanently fixed image on the recording material surface As a heating roller, a heating roller maintained at a predetermined temperature, and a heating roller method in which a recording material as a heating target material is nipped and conveyed by a pressure roller having an elastic layer and pressed against the heating roller while being conveyed. It is heavily used.

However, in the heat roller method, since the heat capacity of the heat roller is large, the time required to heat the heat roller to a predetermined fixing temperature (so-called warm-up time).
It took a long time.

Therefore, recently, a heating apparatus of the above-mentioned film heating type has been proposed and has been put to practical use as an image heating apparatus in an image forming apparatus (Japanese Patent Laid-Open No. 63-313).
182, JP-A-1-263679, JP-A-2-15778, JP-A-4-44075-44
No. 083, JP-A-4-204980-204984
No.).

[0005] Not only as a fixing device, but also a device for heating a recording material carrying an image to improve the surface properties (such as gloss), a provisional deposition process, and other means for heating the recording material. Can be widely used as.

[0006] Such a film heating type heating apparatus can use a heating element in the form of a thermal head and a thin film member having a low heat capacity and a rapid temperature rise, so that power consumption is reduced and warm-up time is shortened ( (Quick start property) is possible, and the temperature rise in the apparatus such as an image forming apparatus can be reduced, and the effect is effective.

[0007]

However, in the conventional film heating type heating apparatus, the time from when power supply to the heating element is started to when the material to be heated is guided to the heating section of the apparatus and enters the heating section. Could not be adjusted, causing the following problems.

1) When the power supplied to the heating element is insufficient, the material to be heated may not be sufficiently heated. Therefore, in the case of fixing processing of the recording material of the image forming apparatus, insufficient fixing occurs due to insufficient heating.

In order to prevent this, if the power is always supplied to the heating element at a predetermined value or more, the durability of the heating element may be impaired.

2) If the temperature (initial temperature) of the heating element or a device member such as a film member and a pressure member around the heating element before the energization of the heating element is excessively low, the energization of the heating element is performed. After the heating is performed, the temperature of the heating member does not rise enough to reach a predetermined heating temperature until the heating target material is guided to the heating unit (heating member position) of the apparatus and enters the heating unit. is there.

In order to prevent such a problem and to obtain a sufficient temperature rise of the heating element irrespective of the initial temperature of the heating element or the device constituent members around the heating element, the power supply to the heating element is increased. Although it is necessary, the same problem as the above 1) occurs.

3) When the room temperature is excessively low, the temperature of the material to be heated is also low, so that the electric power supplied to the heating element is small, or when the initial temperature of the heating element or a device component around the heating element is low. In this case, the insufficient heating of the material to be heated in the cases 1) and 2) is further reduced.

If a heater for preheating the material to be heated or the like is provided to prevent this, there is a problem that the average power consumption of the apparatus increases.

An object of the present invention is to provide a film heating type heating apparatus of this type and an image forming apparatus having the heating apparatus as an image heating apparatus, regardless of the power supplied to the heating body. Therefore, it is possible to sufficiently heat the material to be heated without impairing the heating.

[0015] In addition, regardless of the temperature of the heating element before energization of the heating element, sufficient heating can be performed on the material to be heated without impairing the durability of the heating element. It is in.

[0016] Further, regardless of the temperature of the device constituent members around the heating element before energization to the heating element, sufficient heating can be performed on the material to be heated without impairing the durability of the heating element. Is to be able to do it.

Furthermore, even when the room temperature is excessively low and the power supplied to the heating element is small, or when the initial temperature of the heating element or a device component around the heating element is excessively low,
An object of the present invention is to make it possible to sufficiently heat a material to be heated without impairing the durability of the heating body and without increasing the average power consumption of the apparatus.

In the image heating apparatus or the image forming apparatus provided with the image heating apparatus, the image fixing property is improved particularly in the morning.

[0019]

SUMMARY OF THE INVENTION The present invention is a heating apparatus characterized by the following constitution.

[0020] (1) has a <br/> heated body provided with a heating element which generates heat by energization, and a film member which slides move in close contact with the heating body, and heated through said film member Lumber
Is brought into close contact with the heating body, in the heating apparatus to be applied to the material to be heated through said film member thermal energy of the heating body by moving the position of the heating body material to be heated together with the film member, the Check the power supplied to the heating element
Power detection means to detect and room temperature detection to detect room temperature
Means, and the detected power of the power detection means and the chamber
Depending on the detected temperature of the temperature detecting means, the transport time from energization start to the heating body to be heated material reaches to said heating member
A heating device for controlling the heating.

(2) Temperature of the heating element before energization is started
A heating element temperature detecting means for detecting the temperature;
The transfer time is controlled according to the temperature detected by the body temperature detecting means.
The heating device according to (1), wherein:

(3) A circuit for detecting the temperature around the heating element.
Side temperature detecting means, and further detecting the ambient temperature detecting means.
The transfer time is controlled according to a known temperature.
The heating device according to (1) .

[0023] (4) has a <br/> heated body provided with a heating element which generates heat by energization, and a film member which slides move in close contact with the heating body, and heated through said film member Lumber
Is brought into close contact with the heating body, in the heating apparatus to be applied to the material to be heated through said film member thermal energy of the heating body by moving the position of the heating body material to be heated together with the film member, the Check the power supplied to the heating element
Power detection means for notifying, and said power supply before starting
Heating element temperature detecting means for detecting the temperature of the heating element.
And the detected power of the power detecting means and the temperature detection of the heating element.
Depending on the means of detecting the temperature, controls the transport time from energization start to the heating body to be heated material reaches to said heating member
A heating device.

(5) A circuit for detecting the temperature around the heating element.
Side temperature detecting means, and further detecting the ambient temperature detecting means.
The transfer time is controlled according to a known temperature.
(4) .

(6) Equipped with a heating element that generates heat when energized
A heating element and a film that slides and moves in close contact with the heating element
And a member to be heated through the film member.
The heating member is brought into close contact with the heating member,
By moving the position of the heating element together, the heat
Applying energy to the material to be heated via the film member
In the heating device, the power supplied to the heating element is detected.
Power detection means for notifying, and a temperature around the heating body.
And an ambient temperature detecting means for detecting the temperature.
According to the detected power of the stage and the temperature detected by the ambient temperature detecting means.
The material to be heated is heated from the start of energization to the heating body.
A heating device for controlling a transport time until the heating device is reached .

[0026]

[0027]

[0028]

[0029]

[0030]

[0031]

[0032]

[0033]

[0034]

[0035]

[0036]

[0037]

[0038]

[0039]

< Operation > As described above, electric power and room temperature (or heating element temperature, or heating)
Combination of body ambient temperature) to open current to heating body
Controls the transport time from the beginning until the material to be heated reaches the heating element
Control, for example, at room temperature (or heating
If the power is large even though the temperature around the heating element is low,
The heated material is moved and the material to be heated is heated from the start of energizing the heating element.
The transport time to reach the body can be shortened,
It is possible to reduce the case where the eight time is long.

[0041]

[0042]

[0043]

[0044]

In the image heating apparatus or the image forming apparatus provided with the image heating apparatus, good fixability, especially good constant morning fixability can be always obtained.

[0046]

DESCRIPTION OF THE PREFERRED EMBODIMENTS (1) Example of Image Forming Apparatus (FIG. 1) FIG. 1 shows a schematic configuration of an example of an image forming apparatus. The image forming apparatus of this embodiment employs a film heating type heating device 50 as an image heating device (image heating and fixing device), and is an electrophotographic copying machine of a reciprocating type of a document table, a rotating drum type, a transfer type, and a process cartridge detachable type. Device.

Reference numeral 100 denotes a housing of the apparatus, and 101 denotes a reciprocating original placing table made of a transparent plate member such as a glass plate disposed on an upper plate 102 of the housing of the apparatus.
It is reciprocally driven at a predetermined speed on the upper side to the right side a and the left side a 'in the drawing.

A document G is placed on the upper surface of the document placing table 101 with the image side to be copied facing downward according to a predetermined placing reference, and the document pressing plate 103 is put on the document and pressed down. Set.

Reference numeral 104 denotes a slit opening serving as a document illuminating unit which is opened on the surface of the machine housing top plate 102 with a direction perpendicular to the reciprocating movement direction of the document placing table 101 (a 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 101 sequentially moves the position of the slit opening 104 from the right side to the left side during the forward movement of the document table 101 to the right a. The light L of the lamp 105 is passed through the slit opening 104 and the transparent document table 101 in the course of the light scanning, and illumination scanning is performed. Image exposure is performed on 107 surfaces.

The photosensitive drum 107 is coated with a photosensitive layer such as a zinc oxide photosensitive layer or an organic semiconductor photosensitive layer, and is driven to rotate around a central support shaft 108 at a predetermined peripheral speed in the clockwise direction indicated by an arrow b. During the rotation process, a uniform charging process of positive or negative polarity is performed by the charger 109, and the uniformly charged surface is subjected to the image forming exposure (slit exposure) of the original image, thereby forming the image on the surface of the photosensitive drum 107. An electrostatic latent image corresponding to the image image of the document that has been exposed 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 a developing device 110, and the developed toner image is provided with a transfer discharger 111 as a transfer portion. Move to the site.

Reference numeral 121 denotes a transfer material sheet P as a recording material
The transfer material sheet P in the cassette is fed and fed one by one by the rotation of the feed roller 112, and then the leading end of the toner image forming portion on the drum 107 is transferred by the registration roller 113. Discharger 111
, The leading end of the transfer material sheet P also reaches the position between the transfer discharger 111 and the photosensitive drum 107, and is fed synchronously with timing so that they coincide with each other.

Then, the toner image on the photosensitive drum 107 side is sequentially transferred to the surface of the sheet by the transfer discharger 111.

The transfer material sheet P to which the toner image has been transferred by the transfer unit 111 is sequentially separated from the surface of the photosensitive drum 107 by separation means (not shown), and is guided to the image heating device 50 by the transport device 114 and carried. The discharge roller 1 receives an unfixed toner image by heating and fixing it as an image formed product (copy).
The paper is discharged onto the paper discharge tray 117 through the paper tray 16.

After the transfer of the image, the surface of the photosensitive drum 107 is subjected to removal of contaminants such as toner remaining after transfer by a cleaning device 118 and is repeatedly used for image formation.

The PC is a process cartridge which is attached to and detached from the cartridge attaching / detaching portion 120 in the apparatus main body 100.
In the case of the present embodiment, the apparatus main body 10 includes four process devices including a photosensitive drum 107 as an image carrier, a charger 109, a developing device 110, and a cleaning device 118.
0 is detachable and exchangeable.

(2) Image Heating Apparatus 50 (FIG. 2) FIG. 2 is a schematic side view showing a schematic configuration of the image heating apparatus 50.

Reference numeral 1 denotes an endless belt-shaped heat-resistant film (fixing film), which comprises a driving roller 11 disposed substantially in parallel with the driven roller 1 and a driven roller 1 serving as a tension roller.
2 and a heating member (low-heat-capacity linear heater) 2.

The film 1 is applied with tension in a direction extending in the outward direction by a driven roller 12 also serving as a tension roller, and is further brought into contact with a driving roller 11 having a surface coated with silicone rubber or the like to increase the friction coefficient, whereby the film 1 is contacted. With the clockwise rotation of the drive roller 11, the drive roller 11 is driven to rotate at a predetermined peripheral speed in the clockwise direction without wrinkles, meandering, and speed delay.

The film 1 is repeatedly subjected to heat fixing of the toner image, and has a total film thickness of 10 in order to reduce the heat capacity and improve the quick start property.
A single-layer film of PTFE or PFA having a heat resistance, release property, strength, durability, etc. of 0 μm or less, preferably 40 μm or less, or polyimide, polyamideimide, PEE
PTFE, P on the surface of film such as K, PES, PPS
A composite layer film or the like coated with FA, FEP or the like as a release layer.

In this embodiment, a high heat resistant resin such as polyimide, polyetherimide, polyethersulfone, polyetheretherketone or the like having a thickness of 20 μm, nickel,
On the outer peripheral surface of a thin endless belt made of metal such as SUS,
Low surface energy resins such as PTFE (ethylene tetrafluoride resin) and PFA (ethylene tetrafluoride / perfluoroalkyl vinyl ether copolymer resin), or releasability by adding a conductive material such as carbon black to these resins An endless belt having a total thickness of 30 μm in which a coat layer is applied to a thickness of 10 μm is used.

Reference numeral 13 denotes a heater support for supporting the heating element 2 insulated, and reference numeral 10 denotes a film having a film 1 interposed between the heating element 2 and the film on the surface of the heating element 2 by a biasing means such as a spring. It is a pressure roller as pressure means for pressing with a contact pressure of 5 to 10 kg. The pressure roller 10 has a surface layer having good releasability, such as a fluorine coating, and a rubber elastic layer, and is rotated in a counterclockwise direction in the transport direction of the recording material P with the rotation of the film 1. It is driven and rotated.

The film 1 is driven by the driving roller 11 as described above.
At the time of execution of image fixing, at a predetermined peripheral speed, that is, while being in close contact with the surface of the heating element 2 in the clockwise direction indicated by the arrow and sliding on the surface of the heating element, that is, from the image forming section (transfer section) side. The recording material P carrying the unfixed toner image T is driven to rotate without wrinkles at substantially the same peripheral speed as the transport speed of the recording material P.

The heating element 2 includes a heat generating layer (current generating heat resistor) 4 as a heat source that generates heat when energized, as will be described later, and the temperature is raised by the heat generated by the heat generating layer 4.

When the image forming apparatus starts the image forming operation in response to the image forming start signal, the rotation of the film 1 of the image heating apparatus 50 and the energization of the heating element 2 are started at a predetermined timing.

Then, the recording material P carrying the unfixed toner image T on the upper surface at a predetermined timing is conveyed from the transfer unit 111 to the image heating device 50 by the conveying device 114, guided by the entrance guide 20, and rapidly moved. The heating member 2 is heated to a predetermined temperature and is introduced between the pressure roller 10 and the film 1 in a fixing nip portion N (heating portion) which is a pressure nip portion between the heating member 2 and the pressure roller 10.

Then, the unfixed toner image surface of the recording material P is in close contact with the lower surface of the film 1 in the surface moving state, and the fixing nip portion N is overlapped with the film 1 without causing surface deviation or wrinkling. Through the narrow pressure.

As a result, the toner image carrying surface of the recording material P receives the heat of the heating element 2 via the film 1, and the toner is melted at a high temperature and becomes the molten toner Ta softened and adhered to the recording material P surface. Become.

In the case of this apparatus, the recording material P is separated from the film 1 when the recording material P passes through the fixing nip portion N, and at the time of the separation, the molten toner T
The temperature a is still higher than the glass transition point of the toner. Therefore, the recording material P and the film 1 at this separation point
The recording material P hardly causes toner offset to the film 1 because the bonding force (adhesion) with the recording material P is small, and the recording material P is wrapped around the film 1 due to poor separation and jams. It will always separate smoothly without being done.

Since the toner Ta at 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 film surface. Since the surface property is maintained and the resin is cooled and solidified, excessive image gloss does not occur on the fixed toner image surface, and high quality image is obtained.

The recording material P separated from the film 1 in this manner is guided by the paper ejection guide 21 and
6, during which the toner T having a temperature higher than the glass transition point
The temperature a is naturally lowered (naturally cooled) to a temperature lower than the glass transition point, and a solidified image Tb is formed on the recording material P, which is output as an image-fixed recording material.

(3) Heating Element 2 (FIGS. 3 and 4) FIG. 3 is a partially cutaway plan view of the heating element 2 with a middle part omitted.
Is a vertical sectional side view and an energizing circuit diagram with a middle part omitted.

The heating element 2 has an elongated heat resistance, insulation property and good heat whose longitudinal direction is perpendicular to the transport direction of the film 1 or the recording material P as the material to be heated (the width direction of the material to be heated). A conductive substrate 3, an energizing heat generating layer 4 formed along the length of the substrate at the center in the short side of the front side of the substrate, energizing electrodes 5 and 6 at both longitudinal ends of the energizing heat generating layer 4, A heat-resistant overcoat layer (protective layer) 7 that protects the surface of the heating element on which the heating layer is formed, and a temperature detecting element 8 such as an NTC thermistor that detects the temperature of the heating element and that is provided on the back side of the substrate. Linear heating element with heat capacity (ceramic heater)
It is.

The heating element 2 is fixedly disposed on the apparatus frame via a heat-resistant and heat-insulating heater support 13 with the surface on which the energizing heat generating layer 4 is formed being exposed downward.

The heating substrate 3 is made of, for example, alumina, aluminum nitride, or the like having a thickness of 1 mm, a width of 10 mm, and a length of 340.
mm ceramic or the like.

The heating layer 4 is made of, for example, an electric resistance material such as Ag / Pd (silver palladium), RuO ₂ , Ta ₂ N by screen printing or the like, and has a thickness of about 10 μm and a width of 1 to 3 m.
It is formed by coating in a linear or narrow band shape of m.

The power supply electrodes 5 and 6 are screen printed pattern layers of a good conductive material such as Ag.

The overcoat layer 7 is, for example, a heat-resistant glass layer having a thickness of about 10 μm in consideration of sliding with the film 1.

The heater support 13 has a heat insulating property, a high heat resistance and a rigidity for thermally supporting the heating element 2 with respect to the image heating apparatus 50 and the image forming apparatus, and is, for example, PPS (polyphenylene sulfide), PEEK (polyether). (Ether ketone), high heat resistant resins such as liquid crystal polymers, and composite materials of these resins with ceramics, metals, and the like.

An AC voltage is applied to the heat generating layer 4 of the heating element 2 from a power source S. The temperature of the heating element 2 is adjusted by bonding or press-contacting the substrate 3 with a heat conductive silicone adhesive or the like. Or by being formed integrally,
The heating element driving circuit 23 is controlled by a microcomputer (MPU) 22 in accordance with the detected temperature. The heating element driving circuit 23 is controlled by a microcomputer (MPU) 22 in accordance with the detected temperature. ing.

That is, the MPU 22 controls the power supply to the heating layer 4 of the heating element 2 so that the temperature of the heating element detected by the temperature detecting element 8 as the temperature detecting means becomes a predetermined heating element control temperature value. To control the temperature of the heating element 2 to a predetermined heating temperature.

The AC voltage V applied to the heating layer 4 of the heating element 2 is detected by a known voltage detection circuit 24,
22. The resistance value of the heating layer 4 of the heating element 2, that is, the resistance value R between the electrodes 5 and 6 is a value between 5Ω and 10Ω, and is recorded in the MPU 22 in 0.1Ω steps.

(4) Weight Time Control-Reference Example 1 In this reference example , the power supply to the heating element 2 is started in accordance with the power W supplied to the heating element 2 (more precisely, the heating layer 4, the same applies hereinafter). Is set so that the time (conveyance time) t from when the recording material P, which is the material to be heated, enters the fixing nip portion N, which is the heating portion of the image heating device 50, is adjusted. The recording material P is sufficiently heated without deteriorating the image quality, thereby preventing insufficient image fixing.

[0085] That is, in the present embodiment, an energization start time and the difference between t _w of the transfer start time of the recording material P, that is the material to be heated from the energization is started to the heating member 2 to the heating member 2 to be The conveyance time (wait time, waiting time) until the recording material P enters the fixing nip N, which is the heating unit of the image heating device 50, will be described with reference to FIG. FIG. 5 is a diagram showing the timing of energizing the heating element 2 and the operation of transporting the recording material P.

When the image formation start signal is issued at time t ₀ , the voltage V applied to the heating element 2 input from the voltage detection circuit 24 to the MPU 22 and the resistance R of the heating element 2 recorded in the MPU 22 , The power W applied to the heating element 2 is determined.

When the voltage V is sufficiently high, the heater 2 is energized by the heater driving circuit 23 using a known phase control method so that W = 900 W.

On the other hand, if the voltage V is excessively low or the resistance R is excessively large, the power that can be supplied to the heating element 2 is V
Limited to ² / R. When the resistance value R of the heating element 2 is excessively small and the maximum current that can be supplied to the apparatus is I ₀ , the power that can be supplied to the heating element 2 is limited to RI ₀ .

The power determined as described above is supplied to heater 2 at time t ₁ . Thereafter, as shown in Table 1, the time t ₂ that has undergone a predetermined time t _w in accordance with the value of the power W
Conveyance of the recording material P is started (start feeding of the recording material P from the paper feed cassette 121), it enters the fixing nip portion N is heated portion at time t ₃ in. At time t ₄ through the subsequent heating step passes through the fixing nip portion N.

[0090]

[Table 1] The setting to adjust the time t (t _w), without changing the process speed of the image forming apparatus as in the present embodiment, with respect to the time t ₀ in FIG. 5, the paper feed cassette of the image forming apparatus 1
From the start of feeding of the transfer material P from
Slow control and to or, conversely, for a given paper feed start timing of the transfer material P from the paper cassette 121 in the image forming apparatus, or earlier time t ₀ in FIG. 5, Ya control or to slow down The control can be performed by increasing or decreasing the speed of the transfer device 114.

(Comparative Example) Regardless of the value of the power W, it was the t _w uniformly 0 seconds, when W = 500W, remarkable fixing failure has occurred.

On the other hand, when _tw was uniformly set to 10 seconds, a waiting time was always generated, and the usability was deteriorated.

[0093] When the configuration is such that the power W is always 900 W or more, the power source of the device becomes large and expensive.

(5) Weight Time Control—Reference Example 2 In this reference example , the conveying speed of the recording material P is changed in accordance with the power W supplied to the heating element 2, that is, the process speed of the image forming apparatus is changed. Accordingly, the recording material P, which is the material to be heated, is sufficiently heated without impairing the durability of the heating element 2, thereby preventing the occurrence of insufficient image fixing.

That is, when the power W is small, the conveying speed of the recording material may be reduced. That is, the time from the start of image formation to the actual heating of the recording material P may be changed according to the power W.

The specific effect of this embodiment is that the speed at which the recording material P passes through the fixing nip N, which is a heating unit, also changes in accordance with the power W. As a result, the power When W becomes small,. Since the time required for the recording material P to enter the fixing nip portion N becomes longer, the temperature of the heating body 2 sufficiently rises even when the power W is low.

[0097] Since the time for the recording material P to pass through the fixing nip portion N becomes longer, the recording material P is sufficiently heated.

As a result, the fixing property of the recording material when the power W is low is further improved.

(6) Weight Time Control—Reference Example 3 In this reference example , the heating element 2 is controlled in accordance with the temperature T _H of the heating element 2 detected by the temperature detecting element 8 before energization of the heating element 2 is started.
The transfer time t _w from the start of power supply to the recording material P, which is the material to be heated, to the time when the recording material P, which is the material to be heated, enters the fixing nip portion N, which is the heating portion of the image heating device 50, is set so as to be adjusted. The recording material P is sufficiently heated without impairing the durability of the recording medium P, thereby preventing insufficient image fixing.

[0100] That is, the aforementioned (4) instead of obtaining the predetermined time t in response to the supply power W to the heating member 2 as in Reference Example 1 sections heating body thermometry at time t ₀ in FIG. 5 According to the detected temperature T _H (° C.) of the element 8, that is, the temperature before energization of the heating element 2 (initial temperature), the time t _w as shown in Table 2
It changes.

As a result, it is possible to prevent defective fixing when the initial temperature of the heating element 2 is low. In a normal environment, the waiting time for preheating the heating body is sufficiently short, so that the usability is not impaired.

[0102]

[Table 2] (7) Weight time control-Reference example 4 This reference example is provided with a temperature detecting means for detecting the temperature of the device components around the heating element 2, and the heating is performed in accordance with the detected temperature _TF of the temperature detecting means. By adjusting the transport time t from the start of energization of the body 2 to the time when the recording material P, which is the material to be heated, enters the fixing nip portion N, which is the heating portion of the apparatus 50,
The recording material P is sufficiently heated without deteriorating the durability of the heating body 2 to prevent insufficient image fixing.

[0103] That is, irrespective of the supply electric power W to the heating member 2 as in the previous case (4) section of Reference Example 1, as shown in FIG. 2 is a peripheral member of the heating member 2 pressing roller 10 5 is provided with a pressure roller temperature detecting element 25 for detecting the temperature of the temperature sensor.
Depending on the initial temperature of the detected temperature T _F, i.e. the pressure roller 10 of the detection temperature sensing element 25 at time t ₀ in is to vary the time t _w as shown in Table 3.

As a result, the same effects as in the third embodiment of the above item (6) can be obtained.

The same control as described above may be performed by detecting the temperature of the film 1 and other components of the device around the heating element.

[0106]

[Table 3] (8) Weight time control-Embodiment 1 In this embodiment, the heating element 2 is controlled in the same manner as in Reference Example 1 in the above (4).
The supply power W with the parameters for room temperature detection means 26 (temperature sensor, FIG. 4) for detecting a room temperature to an image heating apparatus 50 or the image forming apparatus is equipped with, as detected room temperature T _R also parameters of the room temperature sensor 26 , in response to the supply power W and the detection room temperature T _R, the transport time t until the recording material P is the material to be heated from the energization start to the heating body 2 rushes into the fixing nip portion N is heated portion of the apparatus 50 By adjusting the temperature, the recording material P is sufficiently heated without impairing the durability of the heating element 2 and the occurrence of insufficient image fixing is prevented.

[0107] That is, according to the detected temperature T _R of supplying electric power W and the temperature sensor 26 to the heating member 2, the time as shown in Table 4 t _w
Is to change.

[0108] Thus, compared to the case of changing only the time t _w supply power W as in the first embodiment, t _w = 0
(Seconds) in many cases, and as a result, the usability is improved without impairing the fixing performance.

[0109]

[Table 4] (9) Wait time control - Example 2 This example, in the above Example 1 (8) section, and supply electric power W to the heating member 2, in addition to the detection room temperature T _R, further pre
The temperature T _{H of the} heating element 2 detected by the temperature detecting element 8 before the energization of the heating element 2 is started as in Reference Example 3 of the item (6).
With the three members W, T _R , and T _H as parameters, the recording material P, which is the material to be heated from the start of energization to the heating element 2, is a fixing nip portion, which is the heating portion of the apparatus 50, in accordance with these parameters. By adjusting the transfer time t until the heating element 2 enters the heating element 2
The recording material P is sufficiently heated without deteriorating the durability of the recording medium P, and the occurrence of insufficient image fixing is prevented.

That is, the time _tw is changed as shown in Table 5 according to the three members W, T _R , and T _H.

As a result, the control accuracy is further improved, and good fixability can be always obtained without impairing the usability regardless of the use condition of the apparatus.

[0112]

[Table 5] (10) Weight time control-Embodiment 3 a. Power supply W to heating element 2 b. Is detected by the temperature detecting element 8, the temperature T _H c of the heater 2 before the start of energization to the heating body 2. Temperature T _F of device components around heating element 2 detected by temperature detecting element 25 d. By complex parameters W detection at room temperature T _R of the temperature sensor 26, T _H, T _F, the T _R as follows, accordingly, etc., energization start time and the recording material P to the heating body 2 the difference t _w of transport start time, in other words the heating element 2
The optimum wait time (waiting time) from the start of energization to the recording material P, which is the material to be heated, until the recording material P enters the fixing nip portion N, which is the heating portion of the image heating device 50, can also be determined. .

[0113]. W + T _H. W + T _F. W + _TH + _TF . W + T _R + T _F (11) Other Configuration Examples of Heating Device FIGS. 6A, 6B, and 6C each show another configuration example of a film heating type heating device.

(A) shows the heating element 2 and the driving roller 1
Endless belt-like heat-resistant film 1 between two members 1
Is suspended and driven to rotate by the drive roller 11.

(B) shows the heating element 2 and the heating element 2
The cylindrical heat-resistant film 1 is loosely fitted to the outside of the film guide member 35 holding the film, and the film 1 is pressed against the heating body 2 by the pressure roller 10 to rotate the pressure roller 10. By doing so, the film 1 is configured to be rotationally driven while being brought into close contact with the inner surface of the film 2 against the surface of the heating element 2 (pressure roller driving type).

In the case of (c), the heat-resistant film 1 is not an endless belt-shaped one but a rolled long end film, which is fed out on a shaft 36.
It is configured to travel at a predetermined speed from the side to the winding shaft 37 side via the heating body 2.

[0117]

As described above, according to the present invention, with respect to a film heating type heating device and an image forming apparatus having the heating device as an image heating device, power supply to the heating member and energization to the heating member are started. Regardless of the temperature of the heating element before heating, the temperature of device components around the heating element before starting to supply power to the heating element, and the room temperature, the durability of the heating element is not impaired. It is possible to perform sufficient heating on the material to be heated without increasing the average power consumption and without impairing the convenience, and the image heating apparatus or an image forming apparatus including the image heating apparatus is always good. A good fixability, especially a good morning fixedness is obtained. For example, at room temperature
Or the temperature of the heating element or the temperature around the heating element)
If the force is large heard, as soon as possible to the heating body to move the material to be heated
At the time of conveyance from the start of energization until the material to be heated reaches the heating element
Time can be shortened and the wait time is long
The case can be reduced.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram of an example of an image forming apparatus.

FIG. 2 is a schematic side view showing a schematic configuration of an image heating apparatus.

FIG. 3 is a partially cutaway plan view of a heating element with a middle part omitted.

FIG. 4 is a longitudinal side view and a circuit diagram of a heating element with a middle part omitted.

FIG. 5 is a timing diagram of energization of a heating element and a conveyance operation of a recording material.

FIGS. 6A, 6B, and 6C are schematic model diagrams of another example of a configuration of a film heating type heating device.

[Explanation of symbols]

 Reference Signs List 50 image heating device (image heating fixing device) 1 heat-resistant film member (fixing film) 2 heating element (heater) 3 heater substrate 4 heating layer 5.6 power supply electrode 7 protective layer 8 heating element temperature detecting element 10 pressing means ( 22 MPU 23 heating element drive circuit S power supply 24 voltage detection circuit 25 pressure roller temperature sensor 26 room temperature sensor N heating unit (fixing nip) P heated material (recorded material)

Continuation of the front page (72) Inventor Tsuneji Masuda 3-30-2 Shimomaruko, Ota-ku, Tokyo Inside Canon Inc. (56) References JP-A-63-293577 (JP, A) JP-A-5-66696 ( JP, A) JP-A-3-208076 (JP, A) JP-A-5-333655 (JP, A) JP-A-60-121480 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , (DB name) G03G 13/20 G03G 15/20

Claims (6)

(57) [Claims] 1. A heating body provided with a heating element which generates heat by energization, a film member that slides move in close contact with said heating member
When have the film through the member are brought into close contact with the material to be heated to the <br/> heating body of the heating body by moving the position of the heating body material to be heated together with the film member thermal energy via the film member in the heating apparatus to be applied to the material to be heated, the power detection for detecting the electric power applied to the heating element
Means, and room temperature detecting means for detecting room temperature,
Characterized in that depending on the detected temperature of the detection power and the room temperature detecting means of the power detecting means, for controlling the transport time from energization start to the heating body to be heated material reaches to said <br/> heating body And a heating device. 2. The temperature of the heating element before the start of energization.
A heating body temperature detecting means for detecting the heating body temperature;
Controlling the transfer time according to the temperature detected by the temperature detecting means.
The heating device according to claim 1, wherein: 3. A surrounding temperature for detecting a temperature around the heating body.
Temperature detecting means, and further includes a detection temperature of the surrounding temperature detecting means.
The transfer time is controlled according to the degree
The heating device according to claim 1 . 4. A heating member having a heating element which generates heat by energization, a film member that slides move in close contact with said heating member
When have the film through the member are brought into close contact with the material to be heated to the <br/> heating body of the heating body by moving the position of the heating body material to be heated together with the film member thermal energy via the film member in the heating apparatus to be applied to the material to be heated, the power detection for detecting the electric power applied to the heating element
Means for detecting the temperature of the heating body before energization is started.
Heating body temperature detection means, and the power detection means
Depending on the detected temperature detected power and the heating element temperature detecting means, the heating device the heated material from the energization start to the heating body and controlling the transport time to reach to the heating body. 5. An ambient temperature for detecting a temperature around the heating element.
Temperature detecting means , and further includes a detection temperature of the surrounding temperature detecting means.
The transfer time is controlled according to the degree
The heating device according to claim 4 . 6. Heating provided with a heating element that generates heat when energized
And a film member slidingly moved in close contact with the heating body
And having the material to be heated via the film member
Adhere to the heating body and put the material to be heated together with the film member
To move the position of the heating element to the heat energy of the heating element.
Energy to be applied to the material to be heated through the film member.
In the heat device, power detection for detecting power supplied to the heating body
Means for detecting the temperature around the heating element
Means, and the detected power of the power detecting means and the
According to the temperature detected by the side temperature detecting means, the flow to the heating element is performed.
Conveyance from the start of electricity supply until the material to be heated reaches the heating element
A heating device characterized by controlling time .