JP4329422B2 - Fixing device - Google Patents

Fixing device Download PDF

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Publication number
JP4329422B2
JP4329422B2 JP2003170358A JP2003170358A JP4329422B2 JP 4329422 B2 JP4329422 B2 JP 4329422B2 JP 2003170358 A JP2003170358 A JP 2003170358A JP 2003170358 A JP2003170358 A JP 2003170358A JP 4329422 B2 JP4329422 B2 JP 4329422B2
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JP
Japan
Prior art keywords
fixing roll
endless belt
fixing
pressure
pad
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
Application number
JP2003170358A
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Japanese (ja)
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JP2005004126A (en
Inventor
康人 岡林
Original Assignee
富士ゼロックス株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Priority to JP2003170358A priority Critical patent/JP4329422B2/en
Publication of JP2005004126A publication Critical patent/JP2005004126A/en
Application granted granted Critical
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Application status is Expired - Fee Related legal-status Critical
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Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a fixing device for fixing an unfixed toner image formed and carried on a recording medium to a recording medium in an image recording apparatus such as a printer, a copying machine, and a facsimile machine.
[0002]
[Prior art]
In a widely used electrophotographic image recording apparatus, a toner image is formed by transferring toner to an electrostatic latent image formed on an image carrier, and this is transferred onto a recording medium. Pressed and heated by a fixing device to obtain a recorded image.
What is generally known as the above-described fixing device is a state in which a pressure member is pressed against a fixing roll having a heat source via a pressure roll or an endless belt, and the fixing roll is heated to a high temperature. A recording medium carrying a toner image is sent to the pressure contact portion between the fixing roll and the pressure roll or pressure member, and the toner image is fixed.
[0003]
In such a fixing device, pressure distribution is generated in the width direction at the press contact portion between the fixing roll and the pressure roll or the pressure member, and the force for conveying the sheet-like recording medium may become uneven. In such a state, when the sheet conveying force in the central portion becomes larger than both end portions, the both end portions of the sheet are attracted to the central portion as the sheet is fed to the pressing portion, and the pressing portion moves the sheet in the conveying direction. May cause wrinkles. In addition, wrinkles may occur in the endless belt that is sandwiched between the fixing roll and the pressure member and driven to rotate, as in the case of the sheet.
[0004]
In order to prevent the sheet and belt from wrinkling as described above, the following techniques have been proposed.
In the fixing device described in Patent Document 1, a heating roll having a heating source and an endless belt that is stretched and driven by a plurality of rolls are in pressure contact with each other, and the shape of the heating roll starts from the center in the width direction. It is a so-called inverted crown type in which the diameter is enlarged toward both ends. Further, in the fixing device described in Patent Document 2, the pressure roll and the heating body are pressed against each other via an endless belt, and the pressure roll is an inverted crown type. For this reason, the sheet conveyance speed and the belt rotation speed are increased at both ends from the center in the width direction, and the sheet and belt are pulled in the width direction on the upstream side of the press contact portion, so that the sheet and the belt are less likely to be wrinkled.
[0005]
[Patent Document 1]
JP-A-6-266253 [Patent Document 2]
JP-A-4-44076 [0006]
[Problems to be solved by the invention]
However, such a fixing device has the following problems.
In the case where the shape of the heating roll made of the cored bar or the pressure roll made of the cored bar and the elastic layer is an inverted crown type, the difference in diameter is very small, and it is necessary to process it with extremely high accuracy. For this reason, much cost and time are required. In particular, when a surface release layer is formed by performing a tubing process on a pressure roll having an elastic layer, high accuracy is obtained so that the ratio between the diameter of the central portion and the diameter of both end portions in the width direction becomes a predetermined value. Difficult to process. And if the difference in diameter between the central portion and both end portions is too small, the effect of preventing wrinkles is not sufficiently exhibited. On the other hand, if the diameters at both ends are too large relative to the diameter of the central portion, the recording medium cannot be sufficiently pressed at the central portion in the width direction, which may result in poor fixing.
[0007]
The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a fixing device capable of always performing good image fixing and preventing wrinkles from occurring on a recording medium. It is.
[0008]
[Means for Solving the Problems]
In order to solve the above-described problems, the invention according to claim 1 of the present application includes a fixing roll that is provided with a heat source and is driven to rotate, and a part of the fixing roll is in contact with the circumferential surface of the fixing roll to move around. An endless belt supported in a movable manner, and a pressure pad that is arranged along the axial direction of the fixing roll and presses the endless belt against the fixing roll from the inside of the endless belt, The pressure pad has a pressing surface facing the peripheral surface of the fixing roll, the pressing surface is pressed against the fixing roll via the endless belt, and the pressure pad is fixed to the fixing roll. The shape formed by the edge of the pressing surface before being pressed by the roll is such that the circumferential dimension of the endless belt is larger in the vicinity of both ends than the center in the width direction of the endless belt. A fixing device is provided.
[0009]
Since the circumferential dimension of the endless belt is larger in the vicinity of both ends than the center in the width direction of the endless belt, the pressing surface of the pressure pad that presses the fixing roll has both ends from the center in the width direction. In the vicinity, the frictional force between the fixing roll and the endless belt and the recording medium becomes large, and in the vicinity of both ends, the conveying force of the endless belt and the recording medium becomes large. Accordingly, a force pulling in the width direction acts on the endless belt and the recording medium on the upstream side of the pressure contact portion between the pressure pad and the fixing roll, and wrinkles are prevented from occurring on the endless belt and the recording medium.
[0010]
According to a second aspect of the present invention, in the fixing device according to the first aspect, the fixing roll has an elastic layer on a peripheral surface, and the pressure pad is elastically deformed when pressed against the fixing roll. A first pressure contact member, and a second pressure contact member disposed downstream of the first pressure contact member in a circumferential direction and having a hardness higher than that of the first pressure contact member. The pressing surface has a ratio a / b (= α) between the circumferential dimension a at the center in the width direction of the endless belt and the circumferential dimension b at both ends in the width direction, where 1>α> 0. It is assumed that the range is 3 .
[0011]
The second pressure contact member is harder than the first pressure contact member, and is pressed against the fixing roll on the downstream side of the pressure contact portion. This pressure contact force causes distortion in the elastic layer of the fixing roll. The moving speed of the peripheral surface of the fixing roll is slightly higher than the area where the first pressure contact member is pressed in the portion where the distortion occurs. For this reason, there is a difference in speed between the recording medium that moves following the fixing roll and the portion of the fixing roll where the distortion occurs, and the recording medium is easily peeled off from the fixing roll.
[0012]
The pressing surface of the first pressing member has a circumferential dimension a in the central portion in the width direction of the endless belt, and the ratio a / b of the circumferential dimension b at both ends in the width direction 1 or less As a result, a difference is generated in the force for pressing the recording medium and the endless belt against the fixing roll, and an effect of preventing wrinkles due to an increase in conveying force at both ends. On the other hand, when the ratio a / b between the circumferential dimension a at the central portion of the pressing portion and the circumferential dimension b at both ends is reduced, the function of fixing the image is greatly different between the central portion and the both end portions. Although good image fixing becomes difficult, by setting the ratio a / b to 0.3 or more, good image fixing can be performed without causing a large difference between the central portion and both end portions.
[0014]
According to a third aspect of the present invention, in the fixing device according to the second aspect, the first pressure contact member and the second pressure contact member are pressed against the fixing roll via springs having different spring coefficients. And
[0015]
In the fixing device, the first pressing member and the second pressing member can be pressed against the fixing roll with different pressing forces. As a result, the first pressure contact member can be pressed against the fixing roll with an appropriate pressure to perform good fixing, and the recording medium and the endless belt move smoothly following the fixing roll. Further, the second pressure contact member is pressed against the fixing roll with an appropriate force to cause strain in the elastic layer of the fixing roll, so that the recording medium can be easily peeled off from the fixing roll.
[0016]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a schematic configuration diagram illustrating a fixing device according to an embodiment of the present invention.
In this fixing device, an endless belt 2 is pressed against an outer peripheral surface of a cylindrical fixing roll 1, and an inner end of the endless belt 2 includes a first pad 3a and a second pad 3b. A pressure pad 3 that presses the belt 2 against the fixing roll 1, an oil supply member 4 that supplies a lubricant to the inner peripheral surface of the endless belt 2, a guide member 5a that guides the circumferential movement of the endless belt 2, 5b, a sliding sheet 6 sandwiched between the endless belt 2 and the pressure pad 3, a pad support member 7a for supporting the first pad 3a, and the pad support member 7a to the fixing roll. The spring 7b for biasing, the frame 8 for supporting the second pad 3b, the oil supply member 4, the guide members 5a, 5b and the spring 7b, and both ends in the width direction of the frame 8 (width direction of the endless belt 2). Support The belt end guide 9 and the pressure lever 10 attached to the belt end guide 9 and biasing the frame 8 toward the fixing roll 1 by the spring 10a via the belt end guide 9 constitute a main part. .
In FIG. 1, reference numeral 12 denotes a pedestal for supporting the spring 7b on the frame 8, and reference numeral 13 denotes an auxiliary member that guides the side surface of the spring 7b and partly contacts and guides the inner surface of the endless belt. Indicates.
[0017]
The fixing roll 1 has a heating source 1a such as a halogen lamp inside a cylindrical cored bar 1b, an elastic body layer 1c made of silicone rubber on the surface of the cored bar 1b, and a fluororesin on the outermost layer. A release layer 1d is provided. The fixing roll 1 has a diameter of about 25 mm and is rotationally driven by a driving source (not shown).
[0018]
The endless belt 2 has a two-layer structure of a base layer and a surface layer. The base layer has a heat-resistant resin such as polyimide, polyamide, and polyamide-imide in consideration of heat resistance, strength, and surface smoothness. Alternatively, a metal such as aluminum or stainless steel is used, and the surface layer is made of silicone rubber, fluorine rubber, fluorine coat, or the like that has high heat resistance and high releasability from the toner.
[0019]
As shown in FIG. 2, the pressure pad 3 is provided on the downstream side of the first pad 3 a that is elastically deformed when pressed against the fixing roll 1 and the first pad 3 a in the circumferential direction of the endless belt 2. The second pad 3b is disposed and has a higher hardness than the first pad 3a.
The first pad 3a is made of silicone rubber having a rubber hardness of 15 ° to 40 °, and is fitted to and supported by a pad support member 7a made of synthetic resin. Then, it is pressed against the fixing roll 1 via the endless belt 2 and the sliding sheet 6 by the spring 7 b and the spring 10 a that biases the pressure lever 10. The spring 7b has a smaller spring coefficient than the spring 10a for urging the pressure lever 10, and by urging the pad support member 7a via this spring 7b, independently of the second pad 3b, The pressing force of the first pad 3a against the fixing roll 1 can be set appropriately. The surface pressure P is preferably 7.35 N / cm 2 (0.75 kg / cm 2 )>P> 19.6 N / cm 2 (2.0 kg / cm 2 ).
[0020]
Further, the pressing surface of the first pad 3a is such that the dimension in the circumferential direction of the endless belt 2 is larger in the vicinity of both ends than the central part in the width direction. The ratio a / b (= α) between the circumferential dimension “a” at the center in the width direction of the endless belt 2 and the circumferential dimension “b” at both ends in the width direction is 0.6. The ratio α can be in the range of 1>α> 0.3, and particularly preferably in the range of 0.75>α> 0.5. As a result, the frictional force between the fixing roll 1, the endless belt 2 and the recording paper P increases near the both ends from the center in the width direction at the nip portion between the first pad 3 a and the fixing roll 1, and the conveying force is increased. growing. For this reason, a force pulling in the width direction acts on the endless belt 2 and the recording paper P on the upstream side of the nip portion, thereby preventing wrinkles.
[0021]
The second pad 3b is made of a synthetic resin or metal having a hardness higher than that of the first pad 3a, and is applied to the fixing roll 1 by a spring 10a through the frame 8 and the pressure lever 10 with a larger force than the first pad 3b. It is pressed. Due to this pressing force, distortion occurs in the elastic layer 1c of the fixing roll 1, and the moving speed of the peripheral surface of the fixing roll 1 increases at this portion. A deviation occurs between the speed of the peripheral surface of the fixing roll 1 and the speed at which the recording paper is conveyed, and the recording paper P is easily peeled off from the fixing roll 1.
[0022]
The oil supply member 4 is supported inside the endless belt 2, and the surface of the oil supply member 4 is in contact with the inner peripheral surface of the endless belt 2. The oil supply member 4 is made of a nonwoven fabric such as felt, and the felt is impregnated with a release agent such as silicone oil.
[0023]
The sliding sheet 6 is wrapped around the pressure pad 3 so that the upstream edge is fixed to the frame 8 via the guide member 5a or the auxiliary member 13 and is in contact with the inner peripheral surface of the endless belt 2. The other edge is not constrained and is a free end. Since the sliding sheet 6 is made of a sheet-like member having a smooth surface such as polyimide, and the friction with the inner peripheral surface of the endless belt 2 is small, the endless belt 2 is used to rotate the fixing roll 1. It follows and rotates smoothly.
[0024]
In such a fixing device, the recording paper P on which the toner image is transferred by a transfer device (not shown) is sent between the fixing roll 1 and the endless belt 2. Then, the recording paper P is sandwiched in the nip portion between the fixing roll 1 and the first pad 3 a, and the toner image is heated and melted by the heat of the fixing roll 1. At the same time, the toner image that is pressurized and melted by the first pad 3a and the second pad 3b is pressed against the recording paper P. At this time, due to the shape of the pressing surface S of the first pad 3a, the conveying force is slightly larger at the both ends in the width direction of the recording paper than at the central portion, and therefore the tensile force in the width direction on the upstream side of the recording paper. Acts to prevent wrinkling in the transport direction. The recording paper P to which the toner image is pressed has a slight difference between the peripheral surface speed of the fixing roll 1 and the conveyance speed of the recording paper P at the nip portion between the fixing roll 1 and the second pad 3b. It is peeled from the fixing roll 1 and sent out to the conveyance path 11.
[0025]
Next, the results of experiments using the fixing device will be described with reference to Tables 1, 2 and 3.
Table 1 (a) shows the comparison of the conveying speeds at both ends with respect to the central portion in the width direction of the recording paper by changing the shape of the pressing surface S of the first pad 3a. The experiment was carried out by changing the ratio a / b (= α) between the dimension a of the circumferential pressing surface S in the central part and the dimension b in the circumferential direction at both ends in the width direction. According to this table, when 0.75> α ≧ 0.3, the conveyance speed at both ends in the width direction of the recording paper fed between the endless belt 2 and the fixing roll 1 is higher than that at the center. Therefore, the recording paper is pulled in the width direction and the recording paper is less likely to be wrinkled.
[0026]
Table 1 (b) compares the fixing properties at the central portion in the width direction of the recording paper by changing a / b (= α). When 1>α> 0.5, the fixing is also performed at the central portion. The property is good. That is, the first pad 3a is appropriately pressed by the fixing roll 1 even in the center portion in the width direction, and a fixed image having a substantially uniform image quality can be formed in the width direction.
[0027]
[Table 1]
[0028]
Table 2 (a) compares the transportability of the recording paper by the surface pressure P between the first pad 3a and the fixing roll 1, and Table 2 (b) shows the endless belt 2 by the surface pressure P. This is a comparison of slidability. From these results, when 7.35 N / cm 2 (0.75 kg / cm 2 )>P> 19.6 N / cm 2 (2.0 kg / cm 2 ), the recording paper conveyance force is appropriate and the recording paper is It can be seen that the endless belt 2 is smoothly conveyed and driven by the fixing roll while being transported well.
[0029]
[Table 2]
[0030]
FIG. 3 is a graph showing the opening amount of the slit when the recording paper is conveyed at three positions in the rear portion of the recording paper in the conveying direction. As shown in FIG. 4, the slit is provided at a position 1/4 of the width from the center and both side edges in the width direction of the recording paper.
In the experiment, the shape of the pressing surface to the fixing roll is a flare-type pad having a circumferential dimension a = 3 mm at the center, a circumferential dimension b = 6 mm at both ends, and α = 0.5. , A = 6 mm, b = 6 mm, α = 1 rectangular pad, and the surface pressure between the pad and the fixing roll is 1.0 kg / cm 2 . In FIG. 3, the front side of the recording paper image forming apparatus main body is the front, and the rear side is the rear.
[0031]
From this graph, the flare type pad with α = 0.5 has the slits opened by the force that pulls the recording paper in the width direction on the front and rear of the recording paper, and the recording paper is less likely to wrinkle. I understand. On the other hand, in the rectangular pad of α = 1, the tensile force in the width direction does not act much on the recording paper, and the recording paper tends to wrinkle.
[0032]
FIG. 5 is a schematic configuration diagram showing another embodiment of the fixing device according to the first aspect of the present invention.
In this fixing device, an endless belt 22 is pressed against the outer peripheral surface of the fixing roll 21 by a pressure pad 23, and the recording paper P onto which a toner image is transferred is sandwiched between the fixing roll 21 and the endless belt 22. The toner image is heated and melted and the toner image is pressure-bonded to the recording paper.
[0033]
The pressure pad 23 is made of a synthetic resin such as a silicone rubber having a rubber hardness of 15 ° to 40 °, like the first pad 3a used in the fixing device shown in FIG. The ratio a / b (= α) between the circumferential dimension a at the center of the direction and the circumferential dimension b at both ends in the width direction is in the range of 1>α> 0.3. Accordingly, in the nip portion between the pressure pad 23 and the fixing roll 21, the conveying force of the endless belt 22 and the recording paper P becomes larger near the both ends than the central portion in the width direction, and the endless belt 22 and the recording paper P are wrinkled. It can be prevented from occurring.
The fixing roll 21, the endless belt 22, the oil supply member 24, the guide member 25, the sliding sheet 26, the pad support member 27, the frame 28, the belt end guide 29, and the pressure lever 30 are the fixing device shown in FIG. The same thing is used.
[0034]
【The invention's effect】
As described above, in the fixing device of the present invention, the pressure surface of the pressure pad pressed against the fixing roll from the inside of the endless belt has a circumferential dimension of the endless belt, and the width direction of the endless belt. It is larger near both ends than the central part. For this reason, the frictional force between the fixing roll, the endless belt, and the recording paper is large near both ends from the center in the width direction, and the conveying force of the endless belt and the recording paper is large. As a result, the tensile force in the width direction acts on the endless belt and the recording paper, thereby preventing wrinkles.
[Brief description of the drawings]
FIG. 1 is a schematic configuration diagram illustrating a fixing device according to an embodiment of the present invention.
FIG. 2 is a perspective view showing a pressure pad included in the fixing device shown in FIG.
FIG. 3 is a graph showing the results of an experiment conducted to verify the effect of the fixing device according to the present invention.
FIG. 4 is a schematic view showing a recording paper used in an experiment whose result is shown in FIG.
FIG. 5 is a schematic configuration diagram showing another embodiment of the fixing device according to the first aspect of the present invention.
[Explanation of symbols]
1, 21 Fixing rolls 2, 22 Endless belt 3, 23 Pressure pad 4, 24 Oil supply member 5, 25 Guide member 6, 26 Sliding sheet 7a, 27a Pad support member 7b, 27b Spring 8, 28 Frame 9, 29 Belt end guides 10 and 30 Pressure lever 11 Transport path 12 Base 13 Auxiliary member

Claims (3)

  1. A fixing roll having a heat source therein and driven to rotate;
    An endless belt that is partly in contact with the peripheral surface of the fixing roll and supported so as to be capable of circular movement;
    A pressure pad that is disposed along the axial direction of the fixing roll and presses the endless belt against the fixing roll from the inside of the endless belt;
    The pressure pad has a pressing surface facing the peripheral surface of the fixing roll, and the pressing surface is pressed against the fixing roll via the endless belt,
    Before the pressure pad is pressed against the fixing roll, the shape formed by the edge of the pressing surface is such that the circumferential dimension of the endless belt is wider than the widthwise center of the endless belt. A fixing device characterized by being enlarged in the vicinity.
  2. The fixing roll has an elastic layer on a peripheral surface,
    The pressure pad is disposed on the downstream side in the circumferential direction of the first pressure contact member that is elastically deformed when pressed against the fixing roll, and has a higher hardness than the first pressure contact member. 2 pressure contact members ,
    The pressing surface of the first pressure contact member has a ratio a / b (= α) between a circumferential dimension a at the center in the width direction of the endless belt and a circumferential dimension b at both ends in the width direction. The fixing device according to claim 1 , wherein 1>α> 0.3 .
  3. The fixing device according to claim 2, wherein the first press contact member and the second press contact member are pressed against the fixing roll via springs having different spring coefficients.
JP2003170358A 2003-06-16 2003-06-16 Fixing device Expired - Fee Related JP4329422B2 (en)

Priority Applications (1)

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Application Number Priority Date Filing Date Title
JP2003170358A JP4329422B2 (en) 2003-06-16 2003-06-16 Fixing device

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JP4329422B2 true JP4329422B2 (en) 2009-09-09

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Families Citing this family (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4595596B2 (en) * 2005-03-08 2010-12-08 富士ゼロックス株式会社 Fixing device and image forming apparatus using the same
JP5168874B2 (en) * 2006-10-11 2013-03-27 コニカミノルタビジネステクノロジーズ株式会社 Fixing apparatus and image forming apparatus
JP2008096738A (en) * 2006-10-12 2008-04-24 Fuji Xerox Co Ltd Fixing device
JP2009047913A (en) 2007-08-20 2009-03-05 Konica Minolta Business Technologies Inc Fixing device and image forming apparatus with same
JP5315778B2 (en) * 2008-05-07 2013-10-16 コニカミノルタ株式会社 Fixing apparatus and image forming apparatus
JP5338152B2 (en) * 2008-06-18 2013-11-13 コニカミノルタ株式会社 Fixing apparatus and image forming apparatus
JP4770944B2 (en) 2009-02-23 2011-09-14 コニカミノルタビジネステクノロジーズ株式会社 Fixing apparatus and image forming apparatus
JP4858563B2 (en) * 2009-03-27 2012-01-18 富士ゼロックス株式会社 Fixing apparatus and image forming apparatus
JP4915433B2 (en) 2009-05-28 2012-04-11 コニカミノルタビジネステクノロジーズ株式会社 Fixing apparatus and image forming apparatus
JP2010160528A (en) * 2010-04-26 2010-07-22 Fuji Xerox Co Ltd Fixing device
JP6137119B2 (en) * 2014-10-31 2017-05-31 コニカミノルタ株式会社 Fixing apparatus and image forming apparatus

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