JP3483423B2 - 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 for fixing a visible image formed on an object to be heated to the object to be heated, and an image forming apparatus such as a copying machine or a printer to which the heating device is applied as a fixing device. It is about.

[0002]

2. Description of the Related Art Conventionally, a heating roller system has been generally used as a heating device as a fixing device for fixing a visible image formed on a heated body to the heated body. However, a large heat capacity is required, and it takes time to start up the apparatus from power-on to image output.

Therefore, recently, in order to save power and shorten the time from power-on to image output, for example, JP-A-63-313182 and JP-A-2-157.
No. 878, a film heating fixing method, that is, a heating body that heats a heated body through a thin film (hereinafter referred to as a film), and the heated body is heated through the film. It has been proposed to apply a heating device having a pressurizing body that pressurizes the body as a fixing device.

FIG. 12 is a schematic configuration diagram showing a conventional heating device of a film heating and fixing system having a maximum sheet passing width of A3 size. 101 is a stay, and this stay 101
Is composed of a main body 105 having a U-shaped cross-section that exposes and supports the heating element 103, and a pressure unit 106 that applies pressure to the opposing pressure roller 104 side. Reference numeral 102 denotes a heat-resistant film (hereinafter, abbreviated as film) having a circular cross section which is fitted onto the stay 1.

FIG. 13 is a plan view in which a part of the heating element 103 is cut away and not shown. This heating element 103 is an elongated substrate 131 of heat resistance, insulation, and good thermal conductivity whose longitudinal direction is a direction perpendicular to the conveyance direction a of the recording material P such as the film 102 or a heating object such as paper. Thirteen
1. A resistance heating element 132 formed along the length of the substrate at the central portion in the lateral direction of 1 and a heat resistant overcoat layer 13 for protecting the surface of the heating element on which the resistance heating element is formed.
4. Power supply electrodes 133 at both longitudinal ends of the resistance heating element 132
Along with 133, a linear heating element having a low heat capacity as a whole, including a temperature detecting element 107 such as a thermistor for detecting the temperature of the heating element provided on the back surface side of the substrate is used as the substrate constituting body. The heating element 103 has a resistance heating element 132 fixedly arranged so as to be exposed downward on the lower surface side of the stay 101 having rigidity and heat resistance in FIG. Examples of the heating element 103 of this type include, for example, JP-A-4-44075 to JP-A-4-4.
There are so-called tensionless types disclosed in JP-A No. 4083, JP-A-4-204980 to JP-A-4-204984, and the like.

The substrate 131 of the heating element 103 is made of, for example, alumina or aluminum nitride having a thickness of 1 mm and a width of 1 mm.
It has a length of 0 mm and a length of 330 mm. Further, the resistance heating element 132 is, for example, Ag / Pd (silver palladium), Ru.
It is formed by applying an electric resistance material such as O ₂ or Ta ₂ N in a linear or strip shape having a thickness of about 10 μm and a width of 1 to 3 mm by screen printing or the like.

The power supply electrodes 133 and 133 are, for example, a screen printing pattern layer of Ag or the like, and an overcoat layer 134.
Is a heat-resistant glass layer having a thickness of, for example, about 10 μm.

The pressure roller 104 forms a pressure contact nip portion (fixing nip portion) N by sandwiching the film 102 between the pressure roller 104 and the heating body 103, and acts as a film outer surface contact drive means for rotating the film 102. . The film driving roller / pressurizing roller 104 is composed of a core metal 104a, an elastic layer 104b made of silicon rubber, etc., and an outermost release layer 104c. The film is driven with a predetermined pressing force by a bearing means and a biasing means (not shown). The heating element 103 is disposed so as to be sandwiched between the heating element 103 and the heating element 103. The pressure roller 104 is rotationally driven by the motor M to apply a conveying force to the film by a frictional force between the pressure roller 104 and the outer surface of the film 102.

Next, the operation will be described.

The heating element 103 is heated by heating the resistance heating element 132 over the entire length of the resistance heating element 132 by supplying power to the power supply electrodes 133, 133 at both longitudinal ends of the resistance heating element 132. Detected by. The output of the temperature detecting element 107 is A / D converted and taken into the CPU 108, and based on the information, the AC voltage of the AC power source 110 for energizing the resistance heating element 132 by the triac 109 is controlled by the phase, frequency control, etc. to heat the body heating power. Is controlled to control the temperature of the heating element 103.

That is, when the temperature detected by the temperature detecting element 107 is lower than a predetermined set temperature, the heating element 103 is heated, and when it is high, the heating element 103 is cooled to control the energization to control the heating element. 103 is adjusted to a constant temperature during fixing. Thus, the temperature of the heating element 103 rises to a predetermined level and the film 102 is rotated by the rotation of the pressure roller 104.
In a state in which the rotational peripheral speed of (1) is stabilized, the recording material P on which the image is to be fixed is provided between the pressure contact nip portion N formed by the heating body 103 and the pressure roller 104 from the transfer portion of the image forming apparatus (not shown). The heat of the heating element 103 is applied to the recording material P through the film 102 by being conveyed and introduced, and the nip portion N of the pressure contact nip is conveyed together with the film 102. The (toner image) T is heated and fixed on the surface of the recording material P. Then, the recording material P passing through the pressure contact nip portion N is separated from the surface of the film 102 and conveyed. In this case, the recording material P is passed on the basis of the center.

Since the film 102 is loosely fitted to the stay 101 with a sufficient circumferential length, the film 102 shown in FIG.
As shown in FIG. 3, there is a gap between the film 2 and the stay 1, and before the recording material P enters the nip portion N, the film 2
14A is the end portion of the stay 1 shown in FIG.
Both of the central portions shown in (b) are rotated with the same gap S0.

[0013]

However, in the conventional film heat fixing system, the recording material P (hereinafter referred to as small size paper) having a narrow width with respect to the axial length L of the film 102, for example, 2L / 3. When a recording material having a certain width is continuously passed through the substantially central portion in the axial direction of the film, heat is not taken by the recording material in the non-sheet passing portion. As a result, the temperature of the pressure roller 104 facing the non-sheet passing portion where heat is not absorbed by the recording material is
Since the temperature is higher than that of the paper passing portion where heat is absorbed by the recording material, the outer diameter of the pressure roller 104 becomes larger in the non-paper passing portion than in the paper passing portion due to thermal expansion.

Then, the peripheral speed of the pressure roller 4 becomes higher in the non-sheet passing portion. That is, the film 102 at the nip portion N
The feeding speed of the sheet is higher in the non-sheet passing portion than in the sheet passing portion, and a speed difference occurs, and the film 102 has a twisting force between the sheet passing portion and the sheet non-passing portion. The gap amount between the two is small at the end portion to the gap S _{1 as} shown in FIG. 15 (a), and is large at the center portion to the gap S _{2 as} shown in FIG. 15 (b), so that S ₂ > S 0> S 1. Because of the relationship, the film 102 is in a slackened state like 102 'immediately before the nip portion N as shown in FIG.

When the recording material P enters the nip portion N in such a state, the leading end of the recording material sags the film 102.
However, there is a problem that the recording material P is wrinkled due to variations in the timing of the recording material P entering the nip portion N in the longitudinal direction of the recording material.

The present invention has been made in order to solve the above-mentioned conventional problems, and eliminates the slack of the film,
An object of the present invention is to obtain a heating device which can smoothly convey a recording material as an object to be heated. Another object of the present invention is to obtain an image forming apparatus for applying a high-quality image by applying this heating device as a fixing device.

[0017]

The present invention has the following features.
It is a heating device to collect. (1) A heating body and a film that moves while being in contact with the heating body
And form a nip part with the heating body through the film,
In addition, it supports the pressure roller that drives the film and the heating element.
A film supporting means for guiding the film,
The material to be heated is nipped and conveyed at the top part,
In a heating device for heating a material to be heated by heating with a heating body , the device conveys the material to be heated with a central reference.
Ri, the film supporting means heating apparatus characterized by having a projecting portion on the nip portion upstream side of the both end portions. (2) The length of the protrusion is one side
10% or more and 30% or less of the pressure length of the film
The heating device according to (1), characterized in that (3) Is it the central part of the upstream side surface of the nip part of the film support means?
To the projecting parts on both ends.
The heating device according to (1), which is formed. (4) The heating element and the cylindrical shape that moves while being in contact with the heating element
Nip part with the film and the heating body through the film
A pressure roller for forming and driving the film, and a heating body
A film supporting means for supporting and guiding the film,
Holds the material to be heated at the nip and transports the film.
Heating device that heats the material to be heated by heating with a heating body
In the above, the device conveys the material to be heated on a central basis.
And the film supporting means is a central part excluding both ends.
On the surface opposite to the surface forming the nip portion.
A heating device having a protrusion. (5) A heating body and a film that moves while being in contact with the heating body
And form a nip part with the heating body through the film,
In addition, it supports the pressure roller that drives the film and the heating element.
A film supporting means for guiding the film,
The material to be heated is nipped and conveyed at the top part,
A heating device that heats the material to be heated by heating with a heating element
In addition, the device conveys the material to be heated on the basis of the end portion.
The film supporting means is provided on the recording material conveyance reference side.
On the upstream side surface of the nip portion in the non-sheet passing area on the end portion and the other end side
A heating device having a protrusion. (6) On the upstream side surface of the nip portion of the film supporting means,
Characterized by forming a film ironing part in the entire area of the hand
Addition according to any one of (1), (4) and (5)
Thermal device.

[0018]

[0019]

[0020]

[0021]

[0022]

[0023]

[0024]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the present invention will be described below.

Embodiment 1 1 is a schematic view showing a heating device according to a first embodiment, (a) is a perspective view,
(B) is a side view of a part thereof. In the figure, reference numeral 1 is a stay as a film supporting means, and this stay 1 has a main body 5 having a U-shaped cross section, which exposes and supports a heating body 3.
And a pressurizing portion 6 having a U-shaped cross section, which is assembled to the main body portion 5 and applies pressure to the opposing pressure roller 4 side. Reference numeral 2 is a heat-resistant film having a circular cross section which is fitted onto the stay 1, and the inner peripheral length of the film 2 is larger than the outer peripheral length of the stay 1 including the heating body 3 by, for example, about 3 mm. Therefore, the circumference is loosely fitted to the stay 1 with a margin. The stay 1 is pressed by the pressure roller 4 through the film 2 in the entire longitudinal direction to form the nip portion N.

The film 2 has a thickness of 100 μm in order to reduce the heat capacity and improve the quick start property.
A single layer film such as PTFE, PFA or FEP having heat resistance of preferably 50 μm or less and 20 μm or more, or polyimide, polyamide imide, PEEK, PE
PTFE, PF on the outer peripheral surface of S, PPS, etc. films
A composite layer film coated with A, FEP, etc. is used. In the first embodiment, a composite layer film in which the outer peripheral surface of a polyimide film is coated with PTFE is used.

Since the main body 5 which is a constituent element of the stay 1 supports the heating body and guides the thin film, the projecting portion 7 is formed on the upstream side surface of the nip portion of the main body 5.

Next, the operation will be described.

When the film 2 is set on the stay 1 having the above-described structure, the running shape of the film 2 is urged outward by the protrusions 7 at the both ends and the center of rotation of the film is at the center from the both ends as shown in FIG. It will be in a dented state. On the other hand, when a sheet of A4 vertical size smaller than the maximum sheet passing width W (A3 size) is passed as the recording material P, the diameter of both end portions of the pressure roll 4 corresponding to the non-sheet passing portion is expanded by heating as described above. Then, the film is conveyed fast at both ends of the pressure roller 4 and late at the center. For this reason, the film in the longitudinal center part bulges outward in the film rotation radius direction (indicated by a broken line in the figure), but since it is arranged in a recessed state in advance, the bulge as shown in FIG. 16 occurs. do not do. Therefore, the central portion of the leading edge of the paper does not come into contact with the film that bulges outward in the radial direction of the film rotation when entering the nip, so that wrinkles do not occur due to resistance.

The wrinkle occurrence frequency was measured by changing the length T of the protruding portion 7 provided on the outside of the main body portion 5 in the radial direction of the film rotation. Length T wrinkle occurrence frequency (when A4 longitudinal paper was passed) Paper width W 0% 47% 5% 24% 10% 9% 15% 5% 20% 3% 25% 7% 30% 4% 35% 11% 40% 16% 45% 43% 50% 38% or more I got good results.

The effect is particularly high when the length T is 10% to 30% of the pressing length of the thin film 2 by the pressing body 4.
When the A4 vertical size is passed with respect to the sheet passing width A3, the length T of the non-sheet passing portion is between 10 and 15% with respect to the sheet passing width A3.
Matches the length at which the effect begins to appear. This is considered to be because it is important that the guide shape of the non-sheet passing portion is located outside the sheet passing portion.

Further, at 10% of the length T, the protrusion 7
The wrinkle occurrence frequency was measured by changing the protrusion height S of the wrinkle height S (mm) Wrinkle occurrence frequency (when passing A4 longitudinal paper) 0.00 47% 0.25 51% 0.50 27% 1.00 The results were 6% 1.50 3% 2.00 4%. From this result, it can be seen that as the height S is increased, the occurrence frequency of wrinkles decreases.

Embodiment 2. FIG. 3 is a schematic view showing a heating device according to the second embodiment, (a) is a plan view,
(B) is a side view of a part thereof. In the second embodiment,
A projecting portion 8 is formed on a surface of the stay 1 as a film supporting means excluding both ends thereof, which is opposite to the surface forming the nip portion.

FIG. 4 is an exploded perspective view of the component parts of the stay 1 excluding the film 2. Reference numeral 5 is a main body portion, 6 is a pressing portion having a protrusion 8 formed on the upper surface of the central portion, and 9 and 9 are pressing members. The end bodies 10, 10 and 10 attached to the ends of the pressure portion 6 are pressurizing force applying portions that are assembled to the pressure portion 6 on the outside of the end bodies 9 and 9 to press the pressure portion.

Next, the operation will be proved.

According to the second embodiment, the diameter of the central portion of the film due to the protruding portion 8 is J as shown in FIG.
By making it longer than both ends in the direction, the length in the K direction of the central part becomes shorter than both ends. Therefore, as shown in FIG. 2, the film on the upstream side of the nip has a shape in which the central portion is dented in the film rotation center direction from both end portions.

Therefore, even if a small size paper is passed and the center speed becomes slower than both ends of the film, and the slack occurs in the center part of the film, the slack of the film running shape shown by the solid line in FIG. As a result, the leading edge of the paper does not receive resistance when entering the nip portion, is smoothly conveyed, and wrinkles are less likely to occur.

When the wrinkle occurrence frequency was measured while changing the height difference h between the central portion and both end portions in the longitudinal direction, the height difference h (mm) wrinkle occurrence frequency (%) -1.0 73 -0.5 540 When the height of the central portion was higher than that of both end portions, that is, wrinkle occurrence frequency was 0.063 0.5 21 21 1.0 7 1.5 9 2.0 4.

Embodiment 3. FIG. 5 is a schematic view showing a heating device according to the third embodiment, (a) is a perspective view,
(B) is a partial side view. In the third embodiment, a film ironing portion R is further provided on the upstream side of the nip portion at the central portion in the longitudinal direction in the main body portion 5 shown in FIG. 1, and the film sliding surface of the film ironing portion R is The height H is the same as that of the projecting portions 7 which are the film guide surfaces at both ends, and the ironing portion R and the projecting portions 7 at both ends serve to squeeze the film over the entire longitudinal direction.

In the heating apparatus shown in FIG. 1, when the maximum sheet passing width A3 was passed, the film 2 was sometimes wrinkled due to the stepped portion of the protrusion 7 formed on the upstream side surface of the nip portion of the main body 5. However, in the third embodiment, since the film squeezing portion R is formed over the entire length on the upstream side surface of the nip portion of the film supporting means, the film 2 is prevented from wrinkling on the upstream side of the nip portion. Even if the height H of the ironing portion R is higher or lower than the protruding portions 7 at both ends, the same effect can be obtained as long as the ironing portion is in contact with the film 2 and has an ironing structure.

Fourth Embodiment FIG. 6 is a perspective view showing a heating device according to the fourth embodiment, in which projecting parts 7 are formed at both ends of the upstream side surface of the nip part of the main body part 5, and a film squeezing part R is formed in the central part, and the pressing body 5 is also provided. When the wrinkle occurrence frequency was measured by forming the protruding portion 8 on the upper surface of the central portion of the and the height difference h between the both end surfaces of the pressing body 5 and the protruding portion 8 was measured, the height difference h (mm) Wrinkle occurrence frequency (%) No member 80 6 −1.0 9 −0.5 2 0.0 3 0.5 0 1.0 1.00 1.50 2.00 And the wrinkle occurrence frequency of the film 2 due to the protrusion 8 Has dropped.

Embodiment 5. FIG. 7 is a schematic view showing a heating device in the fifth embodiment, (a) is a perspective view,
(B) is a partial side view. In this heating device, the contact surface of the stay 1 with the film 2 on the upstream side of the nip portion has a step like that of the stay 1 of FIG. 1, but changes gently from the protrusions 7 at both ends to the center. The wall surface 11 is formed. With this configuration, the wrinkles of the film in the A3 size paper passing that may occur in the heating device of FIG. 1 are eliminated.

Sixth Embodiment FIG. 8 is a perspective view showing a heating device according to the sixth embodiment. In the present embodiment, the sheet passing reference is not the center reference as in the above-described embodiments but the end reference (the front side in the drawing). ing. Therefore, stay 1
Is on the upstream side surface of the nip portion in the area (the back in the figure) that becomes the non-sheet-passing area when the A4 portrait size is passed with respect to the maximum sheet-passing width A3 and in a part of the paper-passing area (the front end in the figure). The protrusion 7 is formed and the film contact surface is bulged outward in the radial direction of film rotation. With this configuration, the slack of the film formed on the upstream side of the nip portion when the small size paper is passed is reduced, and the leading end of the paper is prevented from coming into contact with the slack of the film 2 and receiving a resistance to cause wrinkles.

Embodiment 7. In each of the above embodiments,
Although the cylindrical film 2 is used, as shown in FIG. 9, the endless heat-resistant film 2a is attached to the guide rollers 12 and 13 and the heating element 3 which are arranged at each vertex of a substantially triangular shape. Even if the structure is suspended around the stay 1, or as shown in FIG. The same effect can be obtained by configuring the stay 1 in the above-described respective embodiments.

Embodiment 8. FIG. 11 is a schematic diagram showing the configuration of the image forming apparatus of the present invention to which the above heating device is applied. In the figure, 3l is a photosensitive drum having a diameter of 30 mm as an image bearing member. The photosensitive drum 31 is an OPC photosensitive drum having a conductive base layer 31b such as aluminum as a charge generation layer and a photoconductive layer 31a as a charge transport layer formed on the outer peripheral surface thereof as basic constituent layers, and is not shown. Is driven to rotate in the direction of arrow R1 at a predetermined speed.

Around the photosensitive drum 31, a pre-exposure lamp 32 for eliminating the surface charge of the photosensitive drum by pre-exposure in order along the rotation direction thereof, and the surface of the photosensitive drum are uniformly contact-charged to a predetermined potential. And a charging roller 33 having a diameter of 12 mm as a charging member, and the charging roller 33.
Power supply device 34 for applying an oscillating voltage to the photosensitive drum 31
An exposure device 35 that forms an electrostatic latent image on the top according to image information
A developing device 36 that develops a toner image by adhering toner to this electrostatic latent image (in the first embodiment, a reversal developing system using negative toner is used), and the photosensitive drum 3
For example, a transfer roller 37 having a diameter of 12 mm as a transfer member that transfers the toner image on the sheet 1 onto a transfer paper 38 as a recording material.
A static eliminator 39 for removing the electric charge of the transfer paper 38 after the toner image transfer, and an image forming means such as a cleaner 40 for removing and collecting the residual toner adhering to the surface of the photosensitive drum 1 after the toner image transfer. It is arranged. Reference numeral 41 denotes a fixing device to which the heating device described in any of the first to seventh embodiments is applied.

The charging roller 33 and the power supply device 34 constitute a contact charging device, and the charging roller 33 includes a central core metal 33a and a conductive rubber 33b formed on the outer surface thereof.
It is composed of and. Both ends of the cored bar 33a are rotatably supported by a bearing member (not shown) and arranged in parallel with the photosensitive drum 31, and a constant pressing force is applied to the photosensitive drum 31 by a pressing member (not shown). Pressed against each other,
The photosensitive drum 31 is driven to rotate as it rotates. Further, the driving force transmission member 16 such as a gear or roller is attached to the end of the core metal 33a.
It is also possible to attach (see FIG. 3) and receive the driving force to rotate the photosensitive drum 31 in the forward or reverse direction with respect to the rotation.

Next, the operation at the time of image formation by the image forming apparatus configured as described above will be described. Photosensitive drum 31
Is rotationally driven in the direction of arrow R1 at a predetermined speed. An oscillating voltage obtained by superimposing a DC voltage (constant voltage: 625V) on an AC voltage (peak voltage Vpp = 2.0KV, sine wave having a frequency of 400Hz) is applied to the charging roller 33 from the power supply device 34, for example. The surface of the drum 1 is charged to a uniform potential of 1600V.

The photosensitive drum 31 after charging is exposed by the exposing means 35.
Exposure of target image information by (slit exposure of original image,
An electrostatic latent image is formed by receiving a slit exposure of a document image in the illustrated example such as laser beam scanning exposure. Next, this electrostatic latent image is visualized with toner by the developing means 36 to form a toner image.

The transfer means 37 transfers the toner image visualized on the photosensitive drum 31 to the recording paper 38, and then the static eliminator 39 discharges the transferred recording paper 38 to the fixing means 41 of the present invention. The toner image on the recording paper 38 is conveyed and fixed.

On the other hand, after the transfer, the toner remaining on the surface of the photosensitive drum 31 is cleaned and removed by the cleaner 40, and the electric charges remaining on the photosensitive drum 31 are removed by the pre-exposure by the pre-exposure lamp 32. Again, it is ready for the next image formation.

[0052]

As described above, according to the present invention, a heating body for heating an object to be heated through a thin film, and a pressurization for pressurizing the heating object to the heating body through the thin film. In a heating device having a body, a projecting portion is formed on the upstream side surface of the nip portion at both ends of the supporting means for the thin film, or the upstream side surface of the nip portion at one end side sheet passing region and the other end side non-sheet passing region. Since it is configured to form a protruding portion on the center of the sheet, the slack of the thin film is reduced even when the paper is passed through the center or the end, and this slack may cause the heated object to be passed. It is effective in preventing the occurrence of wrinkles.

On the upstream side of the nip of the supporting means for the thin film, the film guide surface is formed so as to form a continuous wall surface that gently changes from the central portion in the longitudinal direction to the projecting portions at both ends. There is an effect that it is possible to surely prevent the generation of wrinkles when the body passes the paper.

Since the film squeezing portion is provided over the entire length on the upstream side surface of the nip of the supporting means for the thin film, it is possible to eliminate the occurrence of wrinkles in the thin film.

[Brief description of drawings]

FIG. 1 is a schematic view of a heating device according to a first embodiment of the present invention with a film removed.

FIG. 2 is a diagram showing a film traveling shape of the heating device according to the first embodiment of the present invention.

FIG. 3 is a schematic diagram of a heating device according to a second embodiment of the present invention.

FIG. 4 is a diagram for explaining how to assemble the essential parts of the heating device according to the second embodiment.

FIG. 5 is a schematic diagram of a heating device according to a third embodiment of the present invention.

FIG. 6 is a schematic diagram of a heating device according to a fourth embodiment of the present invention.

FIG. 7 is a schematic diagram of a heating device according to a fifth embodiment of the present invention.

FIG. 8 is a schematic diagram of a heating device according to a sixth embodiment of the present invention.

FIG. 9 is a schematic view showing a modified example of the film arrangement configuration.

FIG. 10 is a schematic view showing another modified example of the film arrangement configuration.

FIG. 11 is a side view of an image forming apparatus according to a seventh embodiment of the present invention.

FIG. 12 is a side view showing a conventional heating device.

FIG. 13 is a plan view of a heating body applied to a conventional heating device.

FIG. 14 is a schematic view showing a gap between a film and a stay.

FIG. 15 is a schematic view showing a gap between a film and a stay when passing a small size sheet.

FIG. 16 is a perspective view showing film slack in the upstream portion of the nip when a small-sized sheet is passed.

[Explanation of symbols]

1 stay (film support means) 2 thin film 3 heating body 8 Pressurized body 7,8 Projections R film ironing unit N1 Nip part P Recording material (heated object)

─────────────────────────────────────────────────── ─── Continuation of the front page (58) Fields surveyed (Int.Cl. ⁷ , DB name) G03G 15/20

Claims (6)

(57) [Claims] 1. A heating body and a moving body in contact with the heating body.
Nip part with the film and the heating body through the film
A pressure roller for forming and driving the film, and a heating body
A film supporting means for supporting and guiding the film,
Holds the material to be heated at the nip and transports the film.
In a heating device for heating a material to be heated by heating through a heating body , the device conveys the material to be heated with a central reference,
The film supporting means heating apparatus characterized by having a projecting portion on the nip portion upstream side of the both end portions. 2. A method according to claim length of the projecting portion, characterized in that one at 30% or less than 10% of the pressurized圧長of by that full Irumu the pressure roller <br/> 1 The heating device described. 3. The heating device according to claim 1, wherein a continuous wall surface that changes gently from the central portion of the upstream side surface of the nip portion of the film supporting means to the projecting portions at both ends is formed. 4. The heating body and the heating body move while being in contact with the heating body.
The cylindrical film and the heater together with the film
A pressure roller that forms the looped portion and drives the film
And film support that supports the heating element and guides the film
And means for nipping and transporting the material to be heated at the nip portion.
The material to be heated is heated by heating with the heating element through the film.
In the heating device described above, the device conveys the material to be heated with a central reference,
The film supporting means is a central portion excluding both end portions, and a projecting portion is formed on a surface opposite to a surface forming the nip portion.
A heating device having. 5. The heating element and the heating element move while being in contact with the heating element.
Nip part with the film and the heating body through the film
A pressure roller for forming and driving the film, and a heating body
A film supporting means for supporting and guiding the film,
Holds the material to be heated at the nip and transports the film.
In a heating device for heating a material to be heated by heating through a heating body , the device conveys the material to be heated on an end basis,
The film support means has an end portion on the recording material conveyance reference side.
And a protruding shape on the upstream side surface of the nip portion in the non-sheet passing area on the other end side
A heating device having a portion . 6. A film squeezing portion is formed over the entire length on the upstream side surface of the nip portion of the film supporting means, as claimed in any one of claims 1, 4 and 5. Heating device.