JPH074479A - Heating device - Google Patents

Abstract

PURPOSE:To stabilize the film approach control by controlling the approaching movement in the width direction of a film by converting the rotating torque to the displacement of a film extending member by the contact of the film approach detecting member to the end of the film. CONSTITUTION:To a ring 11 as a film approach detecting member, a cylindeer 12 with a small diameter is provided, and a control belt 12 is wound thereon. When a film 1 is moved leaning to the direction D in the rotating process, the ring 11 is increased in a friction force by the rotating film 1, and a torque to driven-rotate the ring 11 in the dirction F by the film 1 is also increased. By the increase of the driven-rotating torque of the ring 11, the control belt 13 is wound on the cylinder 12, and a force to move the ring 11 downward against the lifting force of a spring 5 is generated, and the near side end face of a driven roller 3 is displaced in the lower side direction B. By this displacement, the driven roller 3 generates a twisting at the front and bottom side, the film 1 is moved returning to the direction E reverse to the direction D, and it is stopped by balancing at a specific position.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method in which the material to be heated is brought into close contact with a heating body through a heat resistant film and the position of the heating body is moved together with the film so that the heat of the heating body is passed through the film. The present invention relates to a film heating type heating device that is applied to a material to be heated.

More specifically, an endless belt-shaped film is used as the heat-resistant film, and the film is suspended between a heating body and at least one film stretching member and is rotationally driven to heat the material to be heated. The present invention relates to a film heating type heating device which brings the heat of the heating body to the material to be heated through the film by closely contacting the heating body through the rotating film and moving the position of the heating body together with the film.

[0003]

2. Description of the Related Art A film heating type heating device as described above has been proposed in, for example, Japanese Patent Application Laid-Open No. 63-313182, and an electrophotographic copying machine, laser beam printer,
An image heating and fixing device in an image forming apparatus such as a facsimile, a micro film reader printer, an image display (display) device, and a recording machine, that is, an image forming process means such as electrophotography, electrostatic recording, magnetic recording, etc. Direct or indirect (transfer) method to the surface of recording material (electro-fax sheet, electrostatic recording sheet, transfer material sheet, printing paper, etc.) surface using developer (toner) made of resin etc. In an image forming apparatus for forming and carrying an unfixed toner image corresponding to the image information, and heating and fixing the toner image as a permanently fixed image on a recording material surface carrying the image to output an image formed product. It can be used as an image heating and fixing device.

Further, it can be used, for example, as an apparatus for heating a recording material carrying an image to modify the surface properties of gloss and the like, and an apparatus for post-treatment.

The film heating type heating device can use a low heat capacity ceramic heater or the like as a heating body, and by using a thin film, a heat roller type, a hot plate type,
Compared to other heating type heating devices such as belt fixing type and flash fixing type, or image heating and fixing devices, the wait time can be shortened and quick start can be performed, preheating when not in use is not necessary, power saving It has advantages such as being able to achieve higher temperature and suppressing the temperature rise inside the machine, and has been put to practical use.

As described above, an endless belt-shaped film is used as the heat resistant film, and this is used as a heating body.
In a film heating type heating device of a type that is hung between at least one film tension member and rotatably driven, in the process of rotatively driving the film,
A phenomenon in which the rotating film moves naturally along the length of the heating member / tensioning member that suspends and stretches the film in the film width direction orthogonal to the film rotation direction to cause a positional deviation or meandering Occurs.

Factors that cause the film to meander and deviate are the parallelism and twist between the heating member and the tensioning member that suspend the endless belt-shaped film, and the accuracy of these factors. There is a limit to how high the film can be raised, and it is difficult to prevent the displacement of the film (stabilize the running of the film) only by improving the accuracy.

Therefore, there is a film shift control system for automatically controlling the position shift caused by the shift of the film within a predetermined allowable range.

This has means for detecting the positional deviation of the film and means for changing the film deviation direction (means for displacing one of the film tension members) to preset the film deviation position. When the detection means detects that the film is out of the predetermined range, the film shift direction changing means is controlled to return the film to the position within the predetermined range, thereby allowing a predetermined positional deviation due to the shift movement of the film. It is designed to fit within the range.

This film shift control system is configured so that the rotating film is repeatedly moved alternately in two directions, one side and the other side in the film width direction, and as a result, the positional deviation of the film remains within a certain range. It was There are only two control values for this purpose, and it was necessary to determine the control values so that the film would always move in the specified direction. However, the moving force (deviation force) of the film greatly varies depending on the temperature of the film and the film tension member, the change of the surface state due to the durability, and the like.

Since it is necessary to determine the control value with a margin for this variation, the amount of movement of the film in a steady state is inevitably large, and stress on the film has been a problem.

Further, since the moving speed of the film is high, it is necessary to control the film frequently, and it is very difficult to keep the film in the narrow shift control range with high accuracy.

Further, this film shift control system requires a means for detecting the positional deviation of the film and a means for displacing the film tension member, which causes a problem that the structure becomes complicated and the cost becomes high.

There are also the following methods for controlling the film deviation. That is, a film deviation detection member (hereinafter, referred to as a film deviation detection member that is rotatably supported by at least one end portion of at least one film stretching member stretched between a film and a heating body and is in contact with the width direction end portion of the rotating film) A belt deviation detection ring) and a rotational torque (rotational force) due to contact with the end of the rotating film of the belt deviation detection ring is converted into a displacement of the film tension member to shift the rotation of the rotating film in the width direction. Controlling the film tension by displacing the film tensioning member displacing means, converting the rotational torque of the belt deviation detection ring into a linear motion and moving the film tensioning member to a relatively balanced position. Is.

According to this method, special means are not required for the film position detecting means and the member displacing means, so that the control is simple and the control reliability is high.

[0016]

[Problems to be Solved by the Invention]

(A) In the case of the latter film deviation control method described above, the widthwise end portion of the rotating film that comes into contact with the belt detection ring as the film deviation detection member has a material to be heated (hereinafter referred to as a recording material of an image forming apparatus). There is the following inconvenience if it is a portion through which the () is passed, that is, a sheet passing area.

That is, in general, the belt detection ring has a taper shape in which the diameter increases as the engagement amount of the film end increases in order to stably obtain a large rotation torque by contact with the film end. In the case where the film does not extend at the portion where the straight shape changes to the tapered shape, waviness occurs in the film. Since the wavy portion of the film is in the sheet passing area and the image area, there is a problem that image distortion occurs during fixing.

Further, since the belt detection ring and the edge of the film are constantly sliding, abrasion powder generated in the heating body part is accumulated, or abrasion powder is generated due to rubbing between the belt detection ring and the film and accumulated. Therefore, the accumulated abrasion powder sometimes becomes a lump and slips into the heating body. Therefore, the image may be disturbed.

(B) In addition, the widthwise end portion of the rotating film that contacts the belt detection ring has a heating body and a pressing member that adheres the recording material to the heating body through the rotating film. The following problems have been encountered at the portion that passes through the pressure contact nip portion formed by pressure contact.

That is, in the above-mentioned pressure contact nip portion, the surface of the surface protective glass material of the ceramic heater as a heating body,
Since the inner peripheral surface of the film is in close contact with the inner surface of the film and the recording material is pressed against the outer surface of the film by the pressing member with a pressing force necessary for image fixing, the film is inevitably worn. In particular, since the temperature inside the pressure contact nip portion is high, the abrasion of the film is remarkable.

As the film wears, wear debris rotates with the rotating film and collects on the belt sensing ring. If abrasion powder is present between the belt detection ring and the inner circumference of the film, the frictional force between the two changes, which is not stable and decreases. As a result, the torque taken out from the belt detection ring also largely changes or decreases, which causes a problem that the film deviation control becomes unstable.

Further, since the pressurizing member presses with a predetermined pressing force, the load torque is large in this portion. Therefore, the tension difference between the heating element and the film tension member on the film entrance side and the film exit side is large. On the other hand, as mentioned above,
The belt detection ring has a tapered shape in order to obtain sufficient rotation torque. As a result, if the load of the pressurizing member-the large portion and the diameter of the taper-the large portion are the same portion of the film, film spreading and wakame-shaped deformation in this portion may become a problem. It was

(C) Further, if the widthwise end portion of the rotating film that contacts the belt detection ring is the portion that passes through in contact with the heat generation area of the heating element, the following disadvantages occur.

That is, as described above, the belt detection ring is usually tapered in order to obtain a sufficient rotational torque, so that the tension is high at the end of the film, and in this example, the end of the film is high. There is a problem that the film creeps and the edges are deformed into wakame because the temperature is high due to passing in contact with the heating area of the heating element.

Further, in a system in which fluorine-based grease or the like is interposed as a lubricant on the inner peripheral surface of the film, the grease viscosity between the belt detection ring and the film greatly changes as the device warms sufficiently from the cold state. However, the torque taken out from the belt detection ring also greatly changes, and there is a problem that the film deviation control becomes unstable.

In a system without a lubricant, the inner peripheral surface of the belt end portion wears quickly due to the rubbing between the belt detection ring and the film end portion, and the polyimide film usually used as a film in this type of apparatus has a high temperature. In that case, there is a property that it will be significantly worn, so that even a hole may be opened early due to the frictional wear with the belt detection ring.

The present invention solves the above problems (a) to (c).

[0028]

The present invention is a heating device characterized by the following constitutions.

(1) A heat-resistant endless belt-like film which is suspended and rotatably driven between a fixedly supported heating body and at least one film stretching member. A heating device of a film heating system, in which heat of the heating body is applied to the heating body through the film by moving the heating body position together with the film by bringing the heating target material into close contact with the heating body through the above, A film shift detection member that is rotatably supported by at least one end of at least one film stretching member that stretches the film between the heating member and the width direction end of the rotating film, and the film shift detection unit A film tensioning member displacing means for controlling rotational displacement of the rotation film in the width direction by converting the rotation torque caused by the contact of the detection member with the end of the rotation film to the displacement of the film tensioning member. And a heating means characterized in that a film end portion passing in contact with a non-sheet-passing region of a heated material in a sheet-passing width direction of the heating body is configured to come into contact with the film-deviation detecting member. apparatus.

(2) The heating member has a pressurizing member for pressurizing and contacting the film, and the material to be heated is pressed against the heating member in the press-contact nip portion formed by the heating member and the pressing member with the film sandwiched therebetween. The heating device according to (1), which is introduced between the heating device and the member.

(3) A heat-resistant endless belt-like film which is suspended and rotatably driven between a fixedly supported heating body and at least one film stretching member. A heating device of a film heating system, in which the heat of the heating body is applied to the heating body through the film by bringing the heating target material into close contact with the heating body through the film and moving the position of the heating body together with the film. A film deviation detection member that is rotatably supported by at least one end of at least one film tension member that stretches the film between itself and a heating body, and that is in contact with the widthwise end of the rotating film. A film tensioning device that converts the rotational torque caused by the contact of the film deviation detection member with the end of the rotating film into the displacement of the film tensioning member to control the lateral movement of the rotating film. A material displacing means, wherein the film end portion that does not pass through a pressure contact nip portion formed by pressing the heating member and the pressure member against each other is configured to come into contact with the film deviation detection member. Characteristic heating device.

(4) A heat-resistant endless belt-like film which is suspended and rotatably driven between a fixedly supported heating body and at least one film stretching member, and the rotating film A heating device of a film heating system, in which heat of the heating body is applied to the heating body through the film by moving the heating body position together with the film by bringing the heating target material into close contact with the heating body through the above, A film shift detection member that is rotatably supported by at least one end of at least one film stretching member that stretches the film between the heating member and the width direction end of the rotating film, and the film shift detection unit A film tensioning member displacing means for controlling rotational displacement of the rotation film in the width direction by converting the rotation torque caused by the contact of the detection member with the end of the rotation film to the displacement of the film tensioning member. And a heating means characterized in that a film end portion passing in contact with a region having a relatively small heat generation amount in the sheet width direction of the heating body is configured to come into contact with the film deviation detection member. apparatus.

(5) It is characterized in that a film end portion passing in contact with a non-heat generating region of the heating element in the sheet passing width direction contacts the film deviation detecting member (4). The heating device according to.

(6) The heating member has a pressing member for press-contacting the film, and the material to be heated is pressed against the heating member in the pressing nip portion formed by the heating member and the pressing member with the film sandwiched therebetween. The heating device according to (4) or (5), which is introduced between the heating device and the member.

(7) The material to be heated is an image carrier on which an unfixed image is formed and carried, and an image heating and fixing device for heating and fixing the unfixed image on the image carrier is provided (1). The heating device according to any one of to (6).

[0036]

[Function] The film deviation is detected by arranging the end portion of the film in contact with the non-sheet passing area of the heating material in the sheet passing width direction of the heating element to contact the film deviation detecting member (belt detection ring). In the case of the image heating and fixing device, the boundary between the member and the film tension member or the boundary between the film tension members is outside the image area. It is possible to prevent the image from being disturbed when the recording material is fixed. Further, it is possible to prevent the image from being disturbed due to the agglomeration of the film abrasion powder accumulated on the film deviation detecting member, thereby eliminating the problem (a).

By constructing the film end portion which does not pass through the pressure contact nip portion formed by the heating member and the pressure member being in pressure contact with each other, to contact the film deviation detection member,
It was possible to prevent film abrasion powder and the like generated by rubbing between the heating body and the film in the press nip portion from entering the film deviation detection member portion. Further, since there is no tension increase due to the load, it is possible to prevent partial flaking and wrinkle-like deformation of the film, stabilize film deviation control, and make the device durable. Is eliminated.

By configuring the end portion of the film, which comes into contact with the area of the heating element in the widthwise direction of the sheet having a relatively small amount of heat generation, to come into contact with the film deviation detection member, the film deviation detection member is affected. The edges of the film are kept cool and prevent film creep and local deformation. Further, the control of the film deviation can be stabilized, the abrasion of the inner peripheral surface of the film can be suppressed, and the durability of the apparatus can be improved, and the problem (c) can be solved.

Even if the heating body portion corresponding to the film edge portion of the film deviation detection member generates heat, if the amount of heat generation is made sufficiently smaller than that of the central portion of the heating body, the same effect as in the above case is obtained. Can be expected. In this case, there is an effect that it is possible to prevent the fixing property from being deteriorated near the edges.

[0040]

【Example】

<Example 1> (Figs. 1 to 4) Fig. 1 is a partially cutaway perspective view of a main part of a heating device according to an example.
2A is a side view thereof, and FIG. 2B is a cross-sectional side view of a main part. The heating device of this embodiment is a film heating type image heating and fixing device using an endless belt-shaped heat-resistant film (fixing film).

(1) Overall schematic structure of the apparatus 1 is a heat-resistant film in the form of an endless belt, and has a left driving roller 2 and a right driven roller 3 as film tension members arranged substantially parallel to each other. The heating member 4 disposed below the rollers is suspended and stretched between the three members 2, 3 and 4.

The film 1 is, for example, a thin film of heat-resistant resin such as polyimide resin having a thickness of 10 to 100 μm, and a fluorine-based release layer having a thickness of 5 to 20 μm is formed on the outer peripheral surface. It is about 60 to 300 mm.

The driving roller 2 has a diameter of 10 to 30 mm and has a high friction layer such as heat resistant rubber on the surface layer. 2d
Is a roller shaft, both ends of which are at the front end side and the rear end side are rotatably supported by bearings 2a and 2b fixed to the side wall of a device frame (chassis) (not shown). Reference numeral 2c is a gear attached to the shaft portion on the rear end side of the roller 2, and a rotational force is transmitted to the gear 2c from a drive source (not shown) to rotationally drive the roller 2.

The driven roller 3 has its front and rear end shaft portions of the roller shaft 3c rotatably supported by bearings 3a and 3b.

The bearing 3b on the rear end side of the driven roller 3 is fixed to the side wall of the apparatus frame (not shown), but the bearing 3a on the front end side.
Has a degree of freedom of movement in the substantially vertical directions A and B, and the spring 5
It is a movable bearing that is suspended and supported by. The movable bearing 3a has a spring 6 for applying tension to the suspended film 1 by using the driven roller 3 as a tension roller.
Is working.

The heating element 4 is an elongated low heat capacity linear heating element having a longitudinal direction in the film width direction orthogonal to the rotation direction C of the film 1, and is, for example, alumina Al ₂ O ₃ as shown in FIG.
A heat-generating resistor layer 4 having a high heat resistance and electrical insulation, such as a thin ceramic substrate (heater substrate) 4a.
It is a ceramic heater in which b is formed in a strip shape by printing or the like, and the energizing electrode portions 4c and 4c are provided at both ends thereof.
Although not shown in the drawing, the surface of this ceramic heater is generally provided with a thin surface protective layer such as a heat-resistant glass layer. The heating body 4 is fixed to and supported by a stationary support member 8 via a heat insulating member 7.

Reference numeral 9 denotes a pressure roller having a silicone rubber layer or the like as a pressure contact member for pressing the film 1 to the heating body 4, and both end shafts of the roller shaft 9d on the front end side and the rear end side. The bearings are rotatably supported between movable bearings 9a and 9b, each of which has a degree of freedom of movement in the vertical direction. Both bearings are lifted and biased by springs 9c and 9c, respectively, to apply the pressure. The roller 9 sandwiches the film 1 and is brought into pressure contact with the heating body 4 with a predetermined pressure.

The film 1 is maintained in a tensioned state between the driving roller 2, the driven roller 3 and the heating body 4 by the tension roller action of the spring 6 of the driven roller 3, and the driving roller 2 is rotationally driven. By the frictional force between the outer peripheral surface of the driving roller 2 and the inner peripheral surface of the film 1, the inner surface of the film 1 slides in close contact with the surface of the heating body 4 and the clockwise direction C in the drawing.
It is rotationally driven at a predetermined peripheral speed. Pressure roller 9
Rotates following the rotation of the film 1.

A heat-resistant grease (fluorine) is applied to the surface of the heating element 4 in order to reduce the load of the sliding contact between the inner surface of the film 1 and the surface of the heating element 4 and the abrasion of the inner peripheral surface of the film when the film is rotationally driven. Often coated with grease).

The heating body 4 is applied with a voltage of a power supply circuit section (not shown) between the electrode portions 4c and 4c at both ends by power supply connectors (not shown) fitted to both ends of the heating body 4, and the energization heating resistor layer 4b is formed.
Generates heat over its entire length, resulting in a rapid temperature rise.

The temperature of the heating element 4 is raised by the temperature detecting element 4d such as a thermistor provided on the back surface side of the ceramic substrate 4a.
This temperature detecting element 4 is detected by ((b) of FIG. 2).
The energization control circuit (not shown) controls the energization of the energization heating resistor layer 4b so that the temperature of the heating element 4 is maintained at a predetermined fixing temperature in accordance with the detected temperature of d.

While the film 1 is rotationally driven by the drive roller 2 and the heating element 4 is heated to a predetermined temperature by energization, the unfixed toner image t is transferred from the image forming unit side (not shown). When the recording material P as the material to be heated that has been formed and carried is introduced between the film 1 and the pressure roller 9 in the pressure contact nip portion (fixing nip portion) N between the heating body 4 and the pressure roller 9, The recording material P comes into close contact with the outer surface of the rotating film 1 and is pressed against the heating body 4, and passes through the pressure contact nip portion N in an overlapping state with the film 1.

In the process of passing through the pressure contact nip portion, the heat of the heating body 4 is applied to the recording material P via the film 1 and the unfixed toner image t on the recording material P is heated and fused and fixed. The recording material P passes through the pressure contact nip portion N, is separated from the surface of the film 1 and is discharged.

(2) The film deviation control means 11 contacts the widthwise end portion of the rotary film 1, which is rotatably arranged and supported on the front end side of the driven roller 3 coaxially with the driven roller about the shaft 3c. And a belt detection ring as a film deviation detection member.

The inner end surface 11a of the ring 11 is substantially in contact with the front end surface 3d of the driven roller 3 and has substantially the same diameter as that of the driven roller 3.
It has a tapered shape in which the diameter is slightly increased from 1a toward the outer end surface 11b. Further, on the outer end surface 11b of the ring 11, integrally with the ring 11 and concentric with the shaft 3c,
A cylindrical portion 12 having an outer diameter smaller than that of the driven roller 3 is provided.

The control belt 13 is wound around the outer circumference of the cylindrical portion 12 with one end 13a fixed to the cylindrical portion.
The other end 13b of 3 is locked and fixed to a stationary locking member 14 below the cylindrical portion, and a belt portion between the cylindrical portion 12 and the locking member 14 extends in a substantially vertical direction. The control belt 13 is a member that is flexible and has a small tensile elongation. Further, the winding direction of the control belt 13 around the cylindrical portion 12 is the direction in which the control belt 13 is wound around the cylindrical portion 12 by the rotational force due to the sliding friction of the ring 11 with the rotating film 1.

When the film 1 shifts in the D direction (FIG. 1) in the course of its rotation, the width of the end portion of the film on the ring 11 increases. Then, the ring 11 increases the frictional force due to the rotating film 1, and the rotating film 1 also increases the torque to rotate the ring 11 around the shaft 3c in the arrow F direction.

Since the control belt 13 is wound around the cylindrical portion 12 due to the increase in the driven rotational torque of the ring 11, a force for moving the ring 11 downward against the pulling force of the spring 5 is generated. The front end side of the driven roller 3 is displaced in the downward direction B with the stationary bearing 3b on the rear end side as a fulcrum.

Due to the displacement of the driven roller 3 in the downward direction B on the front end side, the driven roller 3 is twisted in the front and back directions, and the film 1 moves back in the direction E opposite to the above-mentioned offset movement D direction. Go ahead and balance at a certain position without moving in the E or D direction. At this time, the frictional force between the film 1 and the ring 11, that is, the force for lowering one end of the roller 3 by winding the control belt 13 and the pulling force by the spring 5 are balanced.

The above-mentioned displacement of the driven roller 3 is caused by the sliding force of the rotating film 1 and the ring 11, which is generated by the sliding force, which pushes down the roller front end side and suspends and supports the roller front end side. It almost stops at a position where the lifting force of the spring 5 is balanced.

By the above operation, the positional deviation due to the offset movement of the rotating film 1 is automatically controlled so as to be within a predetermined allowable range.

The outer diameter of the ring 11 is preferably substantially the same as that of the driven roller 3 so as not to give an extra force to the film 1 at a portion in contact with the driven roller 3. In addition, the rotational force of the ring 11 generated when the rotating film 1 is applied to the ring 11 is generated by the displacement of the film 1 to one side.
It is preferable to surely increase as the running width of the film 1 with respect to 1 increases.

Therefore, in the present embodiment, the diameter of the inner end surface 11a of the ring 11 which is in contact with the front end surface 3d of the driven roller 3 is substantially the same as the diameter of the driven roller 3, as described above.
The taper shape is such that the diameter gradually increases from the inner end surface 11a toward the outer end surface 11b.

In this embodiment, as shown in FIG. 4, the ring 11 is arranged outside the paper passing area. That is, the end portion of the rotating film, which passes through the non-sheet-passing area that does not pass even the recording material of the maximum width that can be used for sheet passing through the apparatus, comes into contact with the ring 11 to control the film shift.

For this reason, the seam between the ring 11 and the roller 3 and the boundary between the rollers 3 are outside the image area. Therefore, even if a waviness occurs in the film portion of this portion, the image is formed when the recording material P is fixed. Disturbance is prevented. Further, it is possible to prevent the disturbance of the image due to the agglomeration of the film abrasion powder accumulated on the ring 11,
The problem of is solved.

<Embodiment 2> (FIG. 5) In this embodiment, as shown in FIG.
Is disposed outside the pressure contact nip portion N formed by the heating body 4 and the pressure roller 9. That is, the film end portion that does not pass through the pressure contact nip portion N is configured to be caught by the ring 11.

Therefore, the heating element 4 in the pressure contact nip portion N is
It was possible to prevent film abrasion powder and the like generated by the rubbing of the film 1 and the film 1 from entering the ring 11 portion.

Further, since there is no tension increase due to the load, it is possible to prevent partial flaking of the film and wrinkle-like deformation, stabilize the film deviation control, and make the device durable. The problem of is solved.

<Embodiment 3> (FIG. 6) In this embodiment, as shown in FIG.
Is arranged at a position corresponding to the outside of the heating area of the heating element 4. That is, it is arranged at a position corresponding to the position (non-heat generating region) of the energizing electrode 4c outside the portion where the energizing heat generating resistor layer 4b is printed on the surface of the heating element.

As a result, the temperature of the end portion of the film applied to the ring 11 is kept low, and creep of the film and local deformation of the film are prevented. Further, the control of the film deviation can be stabilized, the abrasion of the inner peripheral surface of the film can be suppressed, and the durability of the apparatus can be improved, and the problem (c) can be solved.

Even if the heating portion corresponding to the film end portion of the ring 11 is a portion that generates heat, if the amount of heat generation is made sufficiently smaller than that in the central portion of the heating body, the same effect as in the above case is expected. it can.

In this case, there is an effect that it is possible to prevent deterioration of the fixing property in the vicinity of the edges.

<Modifications, etc.> In each of the above embodiments, the ring 11 is provided at one end of the rotating driven roller 3, but the present invention is not limited to this. It may be a circular fixing member, or the ring 11 may be provided at the end of the driving roller 2.

Although the ring 11 is provided at only one end, it may be provided at both ends.

The ring 11 is used as a member for taking out a rotational force by rubbing against the rotating film 1. However, when the rotating angle of this member is small, a part thereof may be a cylinder instead of a full-circular cylinder.

In the embodiment, the control belt 13 is used as a member for converting the rotational force of the ring 11 into the substantially vertical displacement of the driven roller 3, but another means, for example, a cam follower fixed using a cam integrated with the ring is used. It is also possible to displace it by abutting it with.

FIG. 7 shows a film heating structure in which an endless belt-shaped heat-resistant film 1 is suspended and stretched between two members of a driving roller 2 and a heating body 4 and the driving roller 2 is rotated to drive the film 1 to rotate. System heating device. The driven roller 3 of the above embodiment is attached to one end of the drive roller 2 of this apparatus.
The ring 11, the cylindrical portion 12, the control belt 13, the locking member 14, and the suspension spring 5 for the movable bearing 2a.
And the like, which is provided with a film deviation control means.

[0078]

As described above, according to the present invention, there is provided a film heating type heating device using an endless film as a film, wherein a rotatable film deviation detection member is provided at an end of the film tension member. A device for converting the rotational torque due to the contact of the film deviation detection member with the end portion of the rotating film into the displacement of the film tension member to control the lateral movement of the rotating film by a simple means configuration. The deviation control can be stabilized and the device can be made durable.

[Brief description of drawings]

FIG. 1 is a partially cutaway perspective view of a main part of a heating device according to a first embodiment.

2A is a side view thereof, and FIG. 2B is a cross-sectional side view of a main part.

FIG. 3 is a plan view of the heating element.

FIG. 4 is a diagram showing a positional relationship between belt detection rings.

FIG. 5 is a positional relationship diagram of the belt detection ring of the heating device according to the second embodiment.

FIG. 6 is a positional relationship diagram of the belt detection ring of the heating device according to the third embodiment.

FIG. 7 is a cross-sectional side view of a main part of another heating device.

[Explanation of reference symbols] 1 Endless belt-shaped rotation heat resistant film (fixing film) 2 Driving roller 3 Followed roller (tension roller) 4 Heating body 9 Pressure roller 11 Belt detection ring (film deviation detection member) 12 Cylindrical member 13 Control Belt P Recording material (paper) as heated material

Claims (7)

[Claims] 1. A heating element fixedly supported, and at least 1.
It has a heat-resistant endless belt-shaped film that is suspended between two film tension members and is driven to rotate.
A heating device of a film heating system in which the heat of the heating element is applied to the object to be heated through the film by bringing the material to be heated into close contact with the heating element through the rotating film and moving the position of the heating element together with the film. A film deviation detection member that is rotatably supported by at least one end of at least one film tension member that stretches the film between the heating member and the film, and is in contact with the width direction end of the rotating film; A film tension member displacing means for controlling the displacement of the rotation film in the width direction by converting the rotation torque due to the contact of the film displacement detection member with the end portion of the rotation film to the displacement of the film tension member; A film end portion passing in contact with a non-sheet passing area of the heating material in the sheet passing width direction of the heating body is configured to come into contact with the film deviation detection member. Heating apparatus for. 2. A heating member and a pressing member in a press-contact nip portion formed by the heating member and the pressing member sandwiching the film, the heating member having a pressing member for pressing the film into contact with the heating member. The heating device according to claim 1, which is introduced between the heating device and the heating device. 3. A heating element fixedly supported, and at least one heating element.
It has a heat-resistant endless belt-shaped film that is suspended between two film tension members and is driven to rotate.
A film heating method in which heat of the heating element is applied to the heating element through the film by bringing the heating element into close contact with the heating element through the rotating film and moving the position of the heating element together with the film. The heating device of claim 1, wherein the film is rotatably supported by at least one end of at least one film tension member that stretches the film between the film and the heating body, and the film is in contact with the widthwise end of the rotating film. A film tension member displacing means for controlling rotational displacement of the rotating film in the width direction by converting rotational torque due to contact between the detection member and the rotating film end of the film displacement detection member into displacement of the film tension member. And a film end portion that does not pass through a pressure contact nip portion formed by pressing the heating member and the pressure member against each other so as to contact the film deviation detection member. Heating apparatus characterized by being configured. 4. A heating element fixedly supported, and at least 1.
It has a heat-resistant endless belt-shaped film that is suspended between two film tension members and is driven to rotate.
A heating device of a film heating system in which the heat of the heating element is applied to the object to be heated through the film by bringing the material to be heated into close contact with the heating element through the rotating film and moving the position of the heating element together with the film. A film deviation detection member that is rotatably supported by at least one end of at least one film tension member that stretches the film between the heating member and the film, and is in contact with the width direction end of the rotating film; A film tension member displacing means for controlling the displacement of the rotation film in the width direction by converting the rotation torque due to the contact of the film displacement detection member with the end portion of the rotation film to the displacement of the film tension member; The film end portion passing in contact with a region of the heating element having a relatively small amount of heat generation in the sheet width direction is configured to come into contact with the film deviation detection member. Heating apparatus according to claim. 5. The film edge detecting portion, which passes through in contact with a non-heat generating area in the sheet passing width direction of the heating element, is configured to come into contact with the film deviation detection member. The heating device described. 6. A heating member and a pressing member in a pressing nip portion formed by the heating member and the pressing member sandwiching the film, the heating member having a pressing member for pressing the film into contact with the heating member. 6. The method according to claim 4 or 5, characterized in that it is introduced between
The heating device according to. 7. The image heating fixing device, wherein the material to be heated is an image carrier on which an unfixed image is formed and carried, and the image heating fixing device heat-fixes the unfixed image on the image carrier.
The heating device according to any one of 1 to 6.