JPH11231702A - Fixing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent wear of a pressure imparting member caused by both ends of an endless belt of a belt nip system. SOLUTION: The device is equipped with a fixing roll 1 which is rotatably disposed, the endless belt 3 which rotates in pressure-contact with the fixing roll 1, and the pressure application member 4 which is provided inside the endless belt 3 in contact with the endless belt 3 and presses the endless belt 3 to the fixing roll 1. In the case, the width WB of the endless belt 3 is set greater than the width WP of the pressure imparting member 4, and both ends of the endless belt 3 are disposed at or outside both ends of the pressure imparting member 4.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fixing device used for fixing an unfixed image on a recording material by heating and pressing in an image information recording apparatus such as a copying machine, a printer, and a facsimile. The present invention relates to an improvement in a so-called belt nip type fixing device in which an endless belt is pressed against a heating roll and a recording material is passed through a contact nip region formed between the heating roll and the endless belt.

[0002]

2. Description of the Related Art As a conventional belt nip type fixing device of this type, for example, as shown in FIG. 8, a fixing roll 101 provided with a heating source 102 therein is rotatably disposed, Support rolls 103, 104, 105
The endless belt 106 stretched around the endless belt 106 is disposed so that a part of the outer peripheral surface thereof is pressed against the fixing roll 101, and abuts against the inner peripheral surface of the endless belt 106 so that the belt portion faces the fixing roll 101. Pressure applying member 10 for pressing
7 is fixedly disposed (see, for example, Japanese Patent Application Laid-Open No. 9-34291). Here, the endless belt 106 comes into contact with the fixing roll 101 by the support of the support rolls 103 and 104, and at the same time, the pressure applying member 1
Reference numeral 07 denotes a pressure contact with the fixing roll 101. The area where the fixing roller 101 and the endless belt 106 are in contact with each other is the sheet 1 carrying the unfixed toner image 108.
09 is a nip area n that is sandwiched and passes. Reference numeral 110 in the drawing denotes a release agent application device that applies a release agent to both surfaces of the fixing roll 101.

The fixing process in such a fixing device is as follows.
The fixing roll 101 is heated and rotated, and an endless belt 106, which is disposed in pressure contact with the fixing roll 101, is rotated by following the rotation of the fixing roll 101, and is formed between the fixing roll 101 and the endless belt 106. This is performed by carrying in and passing a sheet 109 carrying an unfixed toner image 108 in the nip area n.

In the above-mentioned fixing device of the belt nip type, the endless belt 106 rotated by the pressure applying member 107 which is fixed and disposed is fixed to the fixing roll 10.
Since the pressure is applied to the first side, the pressing surface of the pressure applying member 107 comes into sliding contact with the inner peripheral surface of the endless belt 106. In view of the reduction of the frictional force due to the sliding contact, the pressure applying member 107 has a low friction member 113 made of glass fiber or the like on the surface of the elastic member 112 made of silicon rubber or the like supported by the support plate 111, for example.
And the low friction member 113 is brought into contact with the inner peripheral surface of the endless belt 106.

However, as described above, the pressure applying member 1
07, the low friction member 113 is
Since the surface of the endless belt 106 gradually wears due to the sliding contact with the endless belt 106, the wear products generated by the abrasion are reduced by the inner peripheral surface of the endless belt 106 and each support roll 10.
3, 104, and 105 will adhere to the surface. Such adhesion of the abrasion product gradually increases the sliding resistance between the endless belt 106 and the pressure applying member 107, and as a result, the smooth rotation of the endless belt 106 is impaired and the fixed image is lost. There is a risk of adverse effects.

For this reason, conventionally, for example, as in a fixing device disclosed in the above-mentioned publication, a pressure applying member 10 is used.
7 by applying an appropriate amount of dimethyl silicone oil as a lubricant in advance to the surface of the low friction member 113, thereby reducing the sliding contact resistance between the pressure applying member 107 and the endless belt 106 and reducing the wear of the pressure applying member 107. I try to prevent it. In addition, in order to prevent various adverse effects caused by an excessive or insufficient amount of the lubricant applied in the prior art, the applicant of the present application disclosed in Japanese Patent Application No. 9-201097 as shown in FIG. The endless belt 1 is located between the member 107 and the support roll 103 on the upstream side in the rotation direction of the endless belt 106 of the pressure applying member 107.
06 is provided with a lubricant applying member 114 for applying a lubricant in contact with the inner peripheral surface of the endless belt 106, and the lubricant applying member 114 applies a uniform and appropriate amount of lubricant to the inner peripheral surface of the endless belt 106. I have. By doing so, the sliding contact resistance between the endless belt 106 and the pressure applying member 107 can be stably reduced, and wear of the pressure applying member 107 is prevented. As described above, by applying the above-described technical means to the belt nip type fixing device, the frictional force between the inner peripheral surface of the endless belt 106 and the pressure applying member 107 can be reduced, and As a result, generation of wear products can be prevented.

[0007]

Meanwhile [0006] In the fixing device of a belt nip system, as shown in FIG. 7, the width W _B of the width W _P endless belt 106 of the pressure applying member 107
In the case where the width is wider than the above, the pressure applying member 107 comes into sliding contact not only with the inner peripheral surface of the endless belt 106 but also with its edge portion 106a.

Normally, a hard material such as polyimide or metal is used for the endless belt 106, and its edge portion 106a is shaped like a sharp blade. On the other hand, the endless belt 106 has support rolls 103, 104, 10
5 is stretched under tension. For this reason, when the edge portion 106a slides in a state in which the pressure applying member 107 is stuck, the contact portion 107a on the surface of the pressure applying member 107 is worn. Therefore, the contact portion 10
7a is attached to the inner peripheral surface of the endless belt 106 and the like, and the sliding resistance between the endless belt 106 and the pressure applying member 107 is gradually increased, and the smooth rotation of the endless belt 106 is achieved. May be impaired and adversely affect the fixed image.

Further, due to the progress of the abrasion, a groove is formed by abrasion on the pressing surface of the pressure applying member 107, and there is a possibility that the smooth rotation of the endless belt 106 is impaired or the edge portion 106a is damaged.

Further, the fixing device shown in FIG.
When the low friction layer 113 of the pressure applying member 107 is shaved by 6a, the lubricant applied to the inner peripheral surface of the endless belt 106 penetrates into the elastic member 112 and promotes a decrease in the elastic force and deterioration of the material. There is a possibility that the pressing force to the fixing roll 101 side is reduced, and a shift of a fixed image, a wrinkle of a sheet, or the like is generated.

In order to solve such a technical problem, for example, it is conceivable to chamfer the edge portion 106a.
Thicknesses of １００100 μm are often used. It is technically very difficult to chamfer such a thin endless belt, and there is a problem that the cost increases. It is also conceivable to cover the edge portion with a heat-resistant adhesive tape or the like, but this increases the cost and, particularly, in a mode in which a lubricant is applied to the inner surface of the endless belt 106, the lubricant is coated inside the tape. There is a problem that the tape may be peeled off if it penetrates.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned technical problems, and an object of the present invention is to improve the relationship between the width of a pressure applying member and the width of an endless belt to thereby apply pressure by an endless belt end. An object of the present invention is to provide a belt nip type fixing device capable of preventing abrasion of members.

[0013]

That is, according to the present invention, as shown in FIGS. 1 (a) and 1 (b), a fixing roll 1 rotatably disposed and a pressure roll disposed on the fixing roll 1 to rotate. And an endless belt 3 that is provided inside the endless belt 3 so as to contact the endless belt 3.
In the fixing device and a pressure applying member 4 which presses the endless belt 3 to the fixing roller 1 side, to set the width W _B of the endless belt 3 over the width W _P of the pressure applying member 4, and the pressure applying member The present invention is characterized in that both ends of the endless belt 3 are arranged at both end positions of the endless belt 4 or outside.
1 (a) and 1 (b), the endless belt 3
Is illustrated over a plurality of roll groups 2.

Here, as the fixing device to which the present invention is applied, as shown in FIGS. 1A and 1B, an endless belt 3 may be supported by being wound around a plurality of roll groups 2. Alternatively, the endless belt 3 may be supported only by the pressure applying member 4.

In such a technical means, in the mode in which the endless belt 3 is stretched over the roll group 2, the entire roll group 2 may be fixedly arranged. From the viewpoint of forming each of the rolls of the group 2 and the endless belt 3 and preventing the meandering of the endless belt 3 caused by the imperfect accuracy of the parallelism of the roll group 2 on which the endless belt 3 is stretched, these roll groups are At least one of the rolls is configured such that one end of the roll is displaced in accordance with the meandering of the belt with the other end of the roll serving as a fulcrum, and the endless belt 3 is forcibly moved in one of left and right directions of its rotation. It is preferable that the endless belt 3 is configured as a meandering control support roll 2a that prevents meandering of the endless belt 3.

Further, in a case the endless belt such that meandering, even the width W _B of the endless belt 3 as set in the above width W _P of the pressure applying member 4, the end of the endless belt 3 is pressure applying There is a possibility that the intrusion may occur within both end positions of the member 4. From the viewpoint of preventing such an end portion of the endless belt 3 from entering the end portions of the pressure applying member 4 within both end positions, as shown in FIG.
It is preferable to set the width W _B of the endless belt 3 than the width obtained by adding the maximum meandering width W _W1 and W _W2 of the endless belt 3 in a width W _P of the pressure applying member 4. Here, in the present invention, the width W _P of the pressure applying member refers to the width of a portion in contact with the endless belt 3, and does not abut on the endless belt 3 such as an attachment portion to a base material for fixing the same. Parts are not included.

From the viewpoint of reducing the sliding resistance between the inner peripheral surface of the endless belt 3 and the pressing surface of the pressure applying member 4, a low friction member may be provided on the pressing surface of the pressure applying member 4. preferable.

Next, the operation of the above technical means will be described. In FIG. 1A, a pressure-applying member 4 is provided from the inside of an endless belt 3 that is pressed against a fixing roll 1.
Presses the endless belt 3 toward the fixing roll 1. In addition, the endless belt 3 and the pressure applying member 4
As shown in FIG. 1B, the width W _B of the endless belt 3
Is set to be equal to or larger than the width W _{P of} the pressure applying member 4, and both ends of the endless belt 3 are arranged at the positions of both ends of the pressure applying member 4 or outside thereof. Therefore, when the fixing roller 1 and the endless belt 3 rotate by the fixing operation, both ends of the endless belt 3 exist outside the positions of both ends of the pressure applying member 4. 4 does not wear.

[0019]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail based on an embodiment shown in the accompanying drawings. FIG. 2 shows an embodiment of a fixing device to which the present invention is applied. In FIG. 1, a fixing device according to the present embodiment includes a heating fixing roll 10 having a built-in heating source, and three support rolls 20, 2.
An endless belt 30 which is stretched between the first and the second fixing belts 22 and which is pressed against the heat fixing roll 10;
A pressure pad 40 for contacting and pressing a predetermined range from the inner peripheral surface of the belt toward the heat fixing roll 10, and a lubricant applying device 50 for applying a lubricant by contacting the inner peripheral surface of the endless belt 30. It is composed of

In this embodiment, the heat fixing roll 1
Reference numeral 0 denotes an underlayer 12 made of an elastic material such as silicon rubber on a cylindrical cored metal 11 made of a metal having high thermal conductivity such as aluminum, and excellent heat resistance such as fluororubber. A surface layer 13 made of an elastic material is laminated in this order. A halogen lamp 14 is provided inside the cylinder of the cored bar 11 as a heating source.
On the surface of the heat fixing roll 10, a temperature sensor 15 for measuring the surface temperature of the roll is arranged.

The heat-fixing roll 10 is rotatably supported by a support mechanism (not shown) and is rotated at a predetermined speed in a direction indicated by an arrow in the figure by a drive unit (not shown). In addition, the halogen lamp 14 is feedback-controlled by a temperature controller (not shown) based on a temperature signal from the temperature sensor 15, so that the surface of the heat fixing roll 11 is maintained at a predetermined temperature.

Further, the heat fixing roll 10 and the temperature sensor 1
5, the downstream side in the rotation direction of the heat fixing roll 10 facing the
When the unfixed toner image T on the sheet P is fixed, a release agent supply device 17 for preventing a part of the toner from being offset on the heat fixing roll 10 is arranged. In the present embodiment, the release agent supply device 17 applies a constant amount of the release agent to the surface of the heat fixing roll 10 through a sponge-like suction member 17b and rolls 17c and 17d from a tank 17a for storing an oily release agent. It is designed to supply quantities. Reference numeral 17e denotes a scraper blade which abuts on the roll 17c and regulates the amount of the release agent adhered on the roll to a constant value.

Further, the heat fixing roll 10 and the temperature sensor 1
5, the upstream side of the heating and fixing roll 10 in the rotation direction,
A cleaning device 18 is provided. The cleaning device 18 is configured such that a web 18b made of a nonwoven fabric or the like sent from a delivery roll 18a is brought into contact with the surface of the heating / fixing roll 10 by a pressing roll 18c, and then wound up by a predetermined amount by a winding roll 18d. The toner, paper dust and the like adhering to the surface are removed.

The endless belt 30 is formed of a resin film such as a polyimide film, and includes three support rolls 20 rotatably supported.
It is installed in a state of being bridged between 21 and 22.

Here, the support roll 20 is located at a position downstream of the lowermost point of the heat fixing roll 10 in the rotation direction.
It is rotatably disposed in a state of being pressed by a pressure mechanism (not shown), and also serves as a support roll for the endless belt 30 and a pressure roll for ensuring the self-stripping property of the sheet P after fixing. In addition, the support roll 21
Is rotatably disposed at a position slightly away from the lowermost point of the heat fixing roll 10 toward the upstream side in the horizontal direction.

Further, as shown in FIG. 3, the support roll 22 has one end 22a of the roll shaft attached to a bearing 24 rotatably disposed about a support shaft 23, and the other end of the roll shaft. The portion 22b is attached to a bearing 25 arranged so as to be moved in the horizontal direction (arrows E and F directions) by a displacement drive mechanism (not shown). The displacement drive mechanism of the support roller 22 is fed back by a drive controller that operates based on a detection signal from a sensor (not shown) that detects the meandering travel of the endless belt 30, and the belt meanders (arrows G and H).
Direction) is suppressed.

Therefore, the endless belt 30 is stretched on the three support rolls 20, 21 and 22 with a predetermined tension. In particular, the outer peripheral surface of the belt is heated and fixed by the two support rolls 20 and 21. The paper P carrying the unfixed toner image T is supported so as to be pressed against the surface of the heating roller 10 by a predetermined amount so as to form a nip area n in which the paper P carrying the unfixed toner image T is sandwiched between the heating and fixing roll 10. It is. The support roll 22 supports the endless belt 30 located on the side opposite to the heat fixing roll 10 from the support rolls 20 and 21 and suppresses the meandering of the belt.

An entry guide 28 for guiding the sheet P carrying the unfixed toner image T to the nip area n is provided upstream of the support roll 21. Further, the support roll 2
A discharge guide 29 that guides the sheet P that has passed through the nip area n is disposed downstream of the sheet P.

In this embodiment, as shown in FIGS. 4 and 5, the pressure pad 40 is divided into a support plate 41 and a support plate receiver 42 both made of stainless steel and having a smooth upper surface. A support member having a structure and an elastic layer 4 made of silicone rubber (rubber hardness: 23 ° (JISA)) attached to the upper surface of the support plate 41
3 and a glass fiber sheet impregnated with polytetrafluoroethylene that integrally covers them (FGF, manufactured by Chuko Kasei)
-400-4)). In FIG. 5, the illustration of the low friction layer 44 is omitted.

The support plate 41 has a substantially T-shaped cross section, and has a convex portion 41 a formed on the lower surface thereof along the axial direction of the heat fixing roll 10. The support plate receiver 42
A concave groove 42a into which the convex portion 41a on the lower surface of the support plate 41 is fitted is formed on the upper surface thereof, and a projecting portion 42b is formed on a portion of the lower surface slightly excluding both ends. Here, the reason why the convex portion 41a is provided on the support plate 41 and the concave groove 42a is provided on the support plate receiver 42 so that the two are fitted together is because when the support material is warped, the heat fixing roll 10 This is to prevent the pressure distribution in the axial direction from becoming uneven.

The elastic layer 43 has an upper surface formed in a substantially curved shape along the surface of the heat-fixing roll 10 and extends to near a contact portion between the support roll 20 and the heat-fixing roll 10. It is formed in a suitable shape.
As a result, the support roll 20 and the pressure pad 40 are pressed toward the heat fixing roll 10 and the endless belt 3 is pressed.
In the range where the nip n is formed by pressing 0, it is possible to prevent unevenness in pressure distribution along the surface of the heat fixing roll 10.

Further, the low friction layer 44 is
The support plate receiver 42 and the elastic layer 43 are integrally mounted and wound around the entire periphery.

As shown in FIG. 5, the pressure pad 40 is formed by fitting a support plate 41 on which an elastic layer 43 is attached to a support plate receiver 42, integrating the support plate 41 with screws 45 and the like. , Which is detachably attached to the pressurizing frame 46. The pressurizing frame 46 is formed with a locking concave portion 46a which fits and locks an end portion 42c of a portion of the support plate receiver 42 without the projecting portion 42b at an upper portion on one end side. The end side is swingably attached to a support shaft (not shown) of the fixing device main body through a shaft hole 46b, and a locking recess 46a is provided.
Is biased by a spring 47 at a predetermined pressure toward the heat fixing roll 10.

Here, the width W _P of the pressure pad 40 is as shown in FIG.
As shown in FIG. 2, the width of the portion that is actually pressed against the endless belt 30, that is, the width of the low friction layer on the elastic layer 43 in the present embodiment, is set to the maximum paper size fixed by the fixing device. It is to be appropriately selected based on this.

The width W _B of the endless belt 30 is
Maximum meandering width W of the width W _P of the pressure pad 40 to Zuchu G direction
_W2 and the maximum meandering width _WW1 in the H direction in the figure are added, and a little margin is added.

Further, the lubricant applying device 50 includes an impregnating member 51 impregnated with a lubricant and in contact with the inner peripheral surface of the endless belt 30, and a holding member 52 for holding the impregnating member 51.
It is composed of As the impregnating member 51, for example, Nomex felt having a viscosity of 100 c as a release agent is used.
dimethyl silicone oil (Shin-Etsu Chemical Co., Ltd .:
A material impregnated with KF-96) can be used, but the material is not limited to this, and any material that can be impregnated with a lubricant and is flexible may be used.

The lubricant application device 50 is detachably mounted on the belt rotation upstream side of the pressure pad 40, specifically, on the side surface of the support plate 41 (or the support plate receiver 42) by a screw 53. Installed. At this time, the height of the upper end of the impregnating member 51 is set to be equal to or higher than the height of the upper surface of the pressing pad 40 by about 5 mm, and the upper end of the impregnating member 51 is The state of constantly contacting the inner peripheral surface is maintained.

Next, the operation of the fixing device according to this embodiment will be described. First, when the surface of the heat fixing roll 10 reaches a predetermined temperature by heating the halogen lamp 14 and an image forming operation (for example, a copying operation or a printing operation) in an image forming apparatus (not shown) is started, the image forming apparatus The toner image T is transferred and formed on the sheet P, and the sheet P is conveyed to the fixing device. In synchronization with the start of the image forming operation, the heat-fixing roll 10 starts to rotate in the direction of the arrow in the drawing, and at the same time, the heating is performed in a state where the endless belt 30 is stretched around the three support rolls 20, 21, 22. Following the rotation of the fixing roll 10, the fixing roll 10 starts to rotate in the direction of the arrow in FIG.

As the heat-fixing roll 10 rotates, a release agent is applied to the roll surface from a release agent supply device 17, and unnecessary substances such as residual toner adhering to the roll surface are removed by a cleaning device 18. Removed.

On the other hand, at this time, the endless belt 30
Due to the support by the support rolls 20 and 21 and the pressing by the pressure pad 40, the rotation is performed with a nip area n formed between the heating and fixing roll 10. A lubricant is applied to the inner peripheral surface of the endless belt 30 by the lubricant applying device 50 on the upstream side of the pressure pad 40 in the belt rotation direction. Thereby, the endless belt 30 and the pressure pad 4
0, the lubricant is supplied, and the endless belt 30
The frictional resistance at the contact surface between the pressure pad 40 and the pressure pad 40 is reduced, and the wear of the low friction layer 44 of the pressure pad 40 at the contact surface is prevented.

Then, the paper P carrying the toner image T is carried into the nip area n through the entrance guide 28, and passes therethrough, whereby the toner constituting the toner image T is heated and pressed, and the paper P Settled on top. The paper P on which the fixing process has been performed passes through the area of the surface layer 13 of the heat fixing roll 10 which is elastically deformed by the pressing by the support roll 20, and then is naturally separated from the surface of the heat fixing roll 10. Discharged to the process.

If the endless belt 30 meanders from a normal position during a series of fixing processes, as shown in FIG. 3, the meandering control support roll 22 for suppressing the meandering is displaced and moved. For example, the endless belt 30
Is meandering in the direction of arrow H in the figure, the other end 22b of the support shaft is moved by a predetermined amount in the direction of arrow F with the support shaft 23 of the bearing 24 as a fulcrum. As a result, only the support roll 22 is inclined with respect to the support rolls 20 and 21 whose axes are parallel to each other, so that the endless belt 30 moves while rotating in the direction of arrow G, thereby eliminating meandering. You. Conversely,
When the endless belt 30 travels meandering in the direction of arrow G, the other end 22b of the roll shaft is moved by a predetermined amount in the direction of arrow.

At this time, in the vicinity of the pressure pad 40, FIG.
As shown in FIG. 5, for example, when the endless belt 30 travels in a meandering direction in the direction of arrow H in the drawing and one end of the endless belt 30 approaches the low friction layer 44 of the pressure pad 40, one end of the endless belt 30 is normally Since the meandering control by the support rolls 22 is started before moving from the position to the maximum meandering width W _W2 , both ends of the endless belt 30 do not exist inside the both ends of the pressure pad 40, and both ends of the endless belt 30 do not exist. Does not wear the pressure pad 40.

Conversely, when the endless belt 30 travels in a meandering manner in the direction G in the figure and one end on the opposite side of the endless belt 30 approaches the low friction layer 44 of the pressure pad 40,
The meandering control by the support rolls 22 is started before one end of the endless belt 30 moves from the normal position to the maximum meandering width W _W1, so that both ends of the endless belt 30 exist inside the both ends of the pressure pad 40. Never
Therefore, both ends of the endless belt 30 do not wear the pressure pad 40. Therefore, abrasion of the pressure pad 40 by both ends of the endless belt 30 is reliably prevented.

In this embodiment, the low friction layer 44 is provided on the surface of the pressure pad 40.
The present invention is not limited to this, and may be a mode in which a low friction layer is not provided.

[0046] In order to the endless belt 30 travels very stable, when the meandering control is not required, by setting the width W _B of the endless belt 30 than the width W _P of the pressure pad, endless Abrasion of the pressure pad 40 by both ends of the belt 30 is prevented.

[0047]

As described above, according to the present invention,
Since the width of the endless belt is set to be equal to or greater than the width of the pressure applying member, and both ends of the endless belt are arranged at or at both ends of the pressure applying member, wear of the pressure applying member due to both ends of the endless belt is reduced. Can be prevented.

[Brief description of the drawings]

FIGS. 1A and 1B are explanatory diagrams showing an outline of a fixing device according to the present invention.

FIG. 2 is an explanatory diagram showing one embodiment of a fixing device to which the present invention is applied.

FIG. 3 is an explanatory diagram showing the principle of meandering control of the endless belt.

FIG. 4 is an explanatory cross-sectional view illustrating a configuration of a pressure pad according to the embodiment.

FIG. 5 is an exploded view of a main part showing each configuration of a pressure pad and a lubricant application device.

FIG. 6 is an explanatory diagram showing the relationship between the width of the endless belt and the pressure pad.

FIG. 7 is an explanatory diagram showing a conventional relationship between the width of an endless belt and a pressure pad.

FIG. 8 is a schematic diagram showing a conventional belt nip type fixing device.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Fixing roll, 2 ... Roll group, 2a ... Support roll for meandering control, 3 ... Endless belt, 3a ... Belt edge,
4 ... Pressurizing member, 10 ... Heating fixing roll, 20 ... Support roll (pressure roll), 21 ... Support roll, 22 ... Support roll (steering roll), 30 ... Endless belt, 40 ... Press pad, 50 ... Lubrication Agent application device

Claims (3)

[Claims] A fixing roller rotatably disposed; an endless belt which is disposed in pressure contact with the fixing roll and rotates; and an endless belt provided inside the endless belt so as to be in contact with the endless belt. In a fixing device including a pressure applying member that presses toward the roll side, the width of the endless belt is set to be equal to or greater than the width of the pressure applying member, and both ends of the endless belt are disposed at both end positions of the pressure applying member or outside. A fixing device. 2. The fixing device according to claim 1, wherein the endless belt is rotatably wrapped around a plurality of roll groups, wherein the plurality of roll groups include one or more of which suppresses meandering of the endless belt. Wherein the width of the endless belt is set to be equal to or greater than the width of the pressure applying member plus the maximum meandering width of the endless belt. 3. The fixing device according to claim 1, wherein a low friction member is provided on a surface of the pressure applying member that contacts the endless belt.