CN111123681A - Fixing device and image forming apparatus - Google Patents
Fixing device and image forming apparatus Download PDFInfo
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- CN111123681A CN111123681A CN201911020152.7A CN201911020152A CN111123681A CN 111123681 A CN111123681 A CN 111123681A CN 201911020152 A CN201911020152 A CN 201911020152A CN 111123681 A CN111123681 A CN 111123681A
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- Prior art keywords
- fixing belt
- fixing
- fixing device
- lubricant
- roller
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
- G03G15/00—Apparatus for electrographic processes using a charge pattern
- G03G15/20—Apparatus for electrographic processes using a charge pattern for fixing, e.g. by using heat
- G03G15/2003—Apparatus for electrographic processes using a charge pattern for fixing, e.g. by using heat using heat
- G03G15/2014—Apparatus for electrographic processes using a charge pattern for fixing, e.g. by using heat using heat using contact heat
- G03G15/2017—Structural details of the fixing unit in general, e.g. cooling means, heat shielding means
- G03G15/2025—Structural details of the fixing unit in general, e.g. cooling means, heat shielding means with special means for lubricating and/or cleaning the fixing unit, e.g. applying offset preventing fluid
Abstract
The invention provides a fixing device and an image forming apparatus. The disclosed device is provided with: a fixing member; a heating member; an endless fixing belt rotatably mounted on the fixing member and the heating member; a pressure member that is pressed against the fixing member via the fixing belt to form a nip portion for conveying the recording medium; a lubricant applying section disposed downstream of the fixing member and upstream of the heating member in a rotation direction of the fixing belt, the lubricant applying section applying a lubricant to an inner circumferential surface of the fixing belt; and a sliding member provided on a downstream side of the lubricant applying portion and on an upstream side of the heating member in a rotation direction of the fixing belt so that an inner peripheral surface of the fixing belt is slidable, wherein the lubricant applying portion has a 1 st downstream side end portion located on a downstream side in a transport direction of the recording medium, and the heating member is located on an upstream side in the transport direction from the 1 st downstream side end portion.
Description
Technical Field
The present disclosure relates to a fixing device and an image forming apparatus.
Background
In japanese patent application laid-open nos. 2018-005047 and 2018-013467, techniques for improving the sliding performance of a fixing belt using a lubricant in order to reduce the heat capacity generated in the fixing device are disclosed.
In the fixing device disclosed in japanese patent application laid-open No. 2018-005047, a lubricant transfer unit is provided to transfer lubricant to a central portion side in a width direction of the fixing belt orthogonal to a rotation direction.
In the fixing device disclosed in japanese patent application laid-open No. 2018-013467, a reverse rotation mode in which the fixing belt is rotated in a direction opposite to the rotation direction is executed at a predetermined timing.
Disclosure of Invention
However, in the fixing device disclosed in japanese patent application laid-open No. 2018-005047, the lubricant transfer unit is formed of a groove portion provided on the surface of the fixing member forming the nip portion, and therefore the amount of lubricant in the groove portion is increased, and the amount of lubricant between the surface of the fixing member on which the fixing belt slides and the fixing belt is extremely small. Therefore, the frictional resistance between the fixing belt and the fixing member is still large, and the torque for rotating the fixing belt is also high. This may cause damage to the fixing belt.
In the fixing device disclosed in japanese patent application laid-open No. 2018-013467, the lubricant agent accumulated in the outlet portion of the nip portion can be attached to the fixing belt again by rotating the fixing belt in reverse at a predetermined timing. However, the retained lubricant contains abrasion powder generated by friction between the fixing belt and the fixing member. Therefore, the lubricant that has accumulated is introduced into the nip portion again, and hence abrasion of the inner peripheral surface of the fixing belt is promoted, and the sliding property of the fixing belt becomes unstable. This may cause damage to the fixing belt.
The present disclosure has been made in view of the above-described problems, and an object of the present disclosure is to provide a fixing device and an image forming apparatus capable of suppressing damage to a fixing belt.
The fixing device according to the present disclosure includes: a fixing member; a heating member having a heat source therein; an endless fixing belt rotatably mounted on the fixing member and the heating member; a pressure member that is pressed against the fixing member via the fixing belt to form a nip portion for conveying a recording medium; a lubricant applying section disposed downstream of the fixing member and upstream of the heating member in a rotation direction of the fixing belt, the lubricant applying section applying a lubricant to an inner circumferential surface of the fixing belt; and a sliding member provided downstream of the lubricant application portion and upstream of the heating member in the rotation direction of the fixing belt so that the inner peripheral surface of the fixing belt is slidable. The lubricant applying portion has a 1 st downstream side end portion located on a downstream side in a transport direction of the recording medium. The heating member is located upstream of the 1 st downstream end in the conveying direction.
In the fixing device according to the present disclosure, the pressure member may be a pressure roller.
In the fixing device according to the present disclosure, the heating member may be a heating roller.
In the fixing device according to the present disclosure, a width of the sliding member in a width direction of the fixing belt is equal to or greater than a width of the fixing belt.
The fixing device according to the present disclosure may further include: a holding member for holding the lubricant applying section; and a meandering restricting member that abuts against an end surface of the fixing belt in the width direction and restricts movement of the fixing belt in the width direction. In this case, the holding member preferably has an extending portion extending in the rotation direction on a downstream side of the lubricant applying portion in the rotation direction of the fixing belt, and the frictional resistance of the sliding member is preferably smaller than the frictional resistance of the extending portion. Further, it is preferable that the sliding member is provided on the extending portion so as to reach a position of the meandering restricting member in the width direction of the fixing belt.
In the fixing device according to the present disclosure, the holding member preferably has a 2 nd downstream end portion located on a downstream side in the transport direction of the recording medium, and the heating member is preferably located on an upstream side in the transport direction from the 2 nd downstream end portion.
In the fixing device according to the present disclosure, the sliding member may be a sheet member formed of a fluororesin.
An image forming apparatus according to the present disclosure includes: an image forming unit for forming a toner image on an image carrier; a transfer unit that transfers the toner image from the image bearing member to the recording medium; and the fixing device for fixing the toner image transferred onto the recording medium.
The above and other objects, features, aspects and advantages of the present invention will become apparent from the following detailed description of the present invention, which is to be read in connection with the accompanying drawings.
Drawings
Fig. 1 is a schematic diagram illustrating an image forming apparatus according to an embodiment.
Fig. 2 is a schematic sectional view of the fixing device according to the embodiment.
Fig. 3 is a schematic cross-sectional view showing a peripheral structure of the lubricant applying portion of the embodiment.
Fig. 4 is a diagram showing a positional relationship between the meandering restricting member and the sliding member in the embodiment.
Fig. 5 is a diagram showing a relationship between a moving distance of the fixing belt and a torque in a comparative example.
Fig. 6 is a diagram showing a relationship between a moving distance of the fixing belt and a torque in the embodiment.
Detailed Description
Embodiments of the present disclosure are described below in detail with reference to the drawings. In the embodiments described below, the same or common portions are denoted by the same reference numerals in the drawings, and the description thereof will not be repeated.
Fig. 1 is a schematic diagram illustrating an image forming apparatus according to an embodiment. Referring to fig. 1, an image forming apparatus 100 according to an embodiment will be described.
Fig. 1 shows an image forming apparatus 100 as a color printer. The image forming apparatus 100 as a color printer will be described below, but the image forming apparatus 100 is not limited to a color printer. For example, the image forming apparatus 100 may be a monochrome printer, a facsimile machine, or a multifunction Peripheral (MFP) including a monochrome printer, a color printer, and a facsimile machine.
The image forming apparatus 100 includes image forming units 1Y, 1M, 1C, and 1K, an intermediate transfer belt 30, a primary transfer roller 31, a secondary transfer roller 33, a cartridge 37, a driven roller 38, a drive roller 39, a timing roller 40, a fixing device 50, a casing 80, and a control device 101.
The housing 80 defines a casing of the image forming apparatus 100. The image forming units 1Y, 1M, 1C, and 1K, the intermediate transfer belt 30, the primary transfer roller 31, the secondary transfer roller 33, the cartridge 37, the driven roller 38, the drive roller 39, the timing roller 40, the fixing device 50, and the control device 101 are housed in the casing 80.
The image forming units 1Y, 1M, 1C, and 1K, the intermediate transfer belt 30, the primary transfer roller 31, the secondary transfer roller 33, the cassette 37, the driven roller 38, the drive roller 39, and the timing roller 40 constitute an image forming section. The image forming section forms a toner image on a sheet S as a recording medium conveyed along a conveying path 41 described later.
The image forming units 1Y, 1M, 1C, 1K are arranged in order along the intermediate transfer belt 30. The image forming unit 1Y receives toner supply from the toner bottle 15Y and forms a yellow (Y) toner image. The image forming unit 1M forms a magenta (M) toner image by receiving toner supply from the toner bottle 15M. The image forming unit 1C receives toner supply from the toner bottle 15C to form a toner image of cyan (C). The image forming unit 1K receives toner supply from the toner bottle 15K and forms a Black (BK) toner image.
The image forming units 1Y, 1M, 1C, and 1K are arranged in this order along the intermediate transfer belt 30 in the rotational direction of the intermediate transfer belt 30. The image forming units 1Y, 1M, 1C, and 1K include a photoreceptor 10, a charging device 11, an exposure device 12, a developing device 13, and a cleaning device 17, respectively.
The charging device 11 uniformly charges the surface of the photoreceptor 10. The exposure device 12 irradiates the photoreceptor 10 with laser light in accordance with a control signal from the control device 101, and exposes the surface of the photoreceptor 10 in accordance with the input image pattern. Thereby, an electrostatic latent image corresponding to the input image is formed on the photoreceptor 10.
The developing device 13 applies a developing bias to the developing roller 14 while rotating the developing roller 14, and causes toner to adhere to the surface of the developing roller 14. Thereby, the toner is transferred from the developing roller 14 to the photoreceptor 10, and a toner image corresponding to the electrostatic latent image is developed on the surface of the photoreceptor 10.
The photoreceptor 10 and the intermediate transfer belt 30 contact each other at a portion where the primary transfer roller 31 is disposed. The primary transfer roller 31 has a roller shape and is configured to be rotatable. A transfer voltage of an opposite polarity to the toner image is applied to the primary transfer roller 31, whereby the toner image is transferred from the photoreceptor 10 to the intermediate transfer belt 30. A yellow (Y) toner image, a magenta (M) toner image, a cyan (C) toner image, and a Black (BK) toner image are sequentially superimposed and transferred from the photoreceptor 10 to the intermediate transfer belt 30. Thereby, a color toner image is formed on the intermediate transfer belt 30.
The intermediate transfer belt 30 is stretched over a driven roller 38 and a driving roller 39. The drive roller 39 is rotationally driven by a motor (not shown), for example. The intermediate transfer belt 30 and the driven roller 38 rotate in conjunction with the driving roller 39. Thereby, the toner image on the intermediate transfer belt 30 is conveyed to the secondary transfer roller 33.
The cleaning device 17 is pressed against the photoreceptor 10. The cleaning device 17 collects the toner remaining on the surface of the photoreceptor 10 after the toner image is transferred.
The sheet S is set in the cassette 37. The sheet S is conveyed from the cassette 37 to the secondary transfer roller 33 one by one along the conveying path 41 by the timing roller 40. The secondary transfer roller 33 has a roller shape and is configured to be rotatable. The secondary transfer roller 33 applies a transfer voltage of the opposite polarity to the toner image to the sheet S being conveyed. Thereby, the toner image is attracted from the intermediate transfer belt 30 to the secondary transfer roller 33, and the toner image on the intermediate transfer belt 30 is transferred to the sheet S. Thus, the primary transfer roller 31, the intermediate transfer belt 30, and the secondary transfer roller 33 correspond to a transfer portion that transfers the toner image from the photoreceptor 10 to the sheet S.
The timing of conveying the sheet S to the secondary transfer roller 33 is adjusted by the timing roller 40 in accordance with the position of the toner image on the intermediate transfer belt 30. The timing roller 40 transfers the toner image on the intermediate transfer belt 30 to an appropriate position on the sheet S.
The fixing device 50 pressurizes and heats the sheet S passing through itself. Thereby, the toner image is fixed to the sheet S. In this way, the fixing device 50 fixes the toner image on the sheet S conveyed along the conveying path 41. The sheet S with the toner image fixed thereon is discharged to the tray 48.
In the above description, the image forming apparatus 100 adopting the tandem system as the printing system has been described, but the printing system of the image forming apparatus 100 is not limited to the tandem system. The arrangement of each component in the image forming apparatus 100 may be changed as appropriate according to the printing method used. As a printing method of the image forming apparatus 100, a rotary method or a direct transfer method may be employed. In the case of the rotary system, the image forming apparatus 100 includes 1 photoreceptor 10 and a plurality of developing devices 13 which are configured to be rotatable coaxially. In the image forming apparatus 100, each developing device 13 is sequentially guided to the photoreceptor 10 at the time of printing, and the toner images of the respective colors are developed. In the case of the direct transfer method, the image forming apparatus 100 directly transfers the toner image formed on the photoreceptor 10 to the sheet S.
Fig. 2 is a schematic sectional view of the fixing device according to the embodiment. Referring to fig. 2, the fixing device 50 will be described.
The fixing device 50 includes: a pressure roller 51 as a pressure member, a pad (pad) member 52 as a fixing member, a heat roller 53 as a heating member, a fixing belt 54, a fixing member 55, a lubricant applying portion 56, and a holding member 57.
The pressure roller 51 is disposed outside the fixing belt 54. The pressure roller 51 faces the pad member 52. The pressure roller 51 presses the pad member 52 so as to sandwich the fixing belt 54. Thereby, the fixing belt 54 is pressed against the pad member 52. That is, the pressure roller 51 is pressed against the pad member 52 via the fixing belt 54, and forms a nip portion N for conveying the recording medium. The pressure roller 51 is rotated by a torque from a drive source. The fixing belt 54 rotates along with the rotation of the pressure roller 51. The fixing belt 54 rotates in a direction opposite to the rotation direction of the pressure roller 51 by the rotation of the pressure roller 51.
The pressure roller 51 is composed of, for example, a metal core, a surface layer, and a release layer. The metal core is made of aluminum or iron and is in a tubular shape. The surface layer is, for example, an elastic layer such as silicone rubber. The release layer is provided so as to cover the surface layer. The release layer is made of PFA or the like, for example.
The backing member 52 is disposed inside the fixing belt 54. The pad member 52 is disposed so as to face the pressure roller 51 and sandwich the fixing belt 54. The pad member 52 has a curved surface that gradually protrudes toward the pressure roller 51 side as it advances toward the downstream side in the conveying direction of the sheet S, i.e., as it approaches the exit of the nip portion N. The pad member 52 is made of heat-resistant resin such as polyphenylene sulfide, polyimide, or liquid crystal polymer.
The heating roller 53 is disposed inside the fixing belt 54. The heating roller 53 has a heating source 53a inside. The heating source 53a heats the fixing belt 54. The heating source 53a is, for example, a halogen lamp. The heat source 53a may be a halogen lamp, a heat source that Inductively Heats (IH) the fixing belt 54, or a heat source that generates heat by the fixing belt 54 as a resistance heat generating body.
The heating roller 53 has a cylindrical shape and is formed of metal such as aluminum and stainless steel (SUS). When a halogen lamp is used as the heat source 53a, the inner peripheral surface of the heat roller 53 is preferably black. In order to prevent the outer surface from being scratched by foreign matter or the like, Polytetrafluoroethylene (PTFE) or the like may be plated on the outer peripheral surface of the heating roller 53.
The fixing belt 54 is provided in an endless shape. The fixing belt 54 is rotatably supported by the pad member 52 and the heat roller 53. The fixing belt 54 includes a base layer, an elastic layer, and a release layer.
The outer diameter of the fixing belt is arbitrary, but is preferably 10mm or more and 100mm or less, and preferably about 40 mm. The base layer is preferably made of polyimide, SUS, electroformed nickel, or the like. The thickness of the base layer is preferably 50 μm or more and 70 μm or less. The elastic layer is preferably made of a material having high heat resistance, such as silicone rubber or fluororubber. The thickness of the elastic layer is preferably 120 μm or more and 190 μm or less. The release layer is preferably a structure to which releasability is imparted, such as a fluororesin or a fluorine-based plating layer. The thickness of the release layer is preferably 17 μm or more and 19 μm or less.
The pad member 52 and the holding member 57 are fixed to the fixing member 55. The fixing member 55 has a U-shape with an edge when viewed in the width direction (direction perpendicular to the paper surface) of the fixing belt 54. The fixing member 55 is disposed so that the U-shaped tip end faces the heating roller 53. The pad member 52 is fixed to a U-shaped bottom portion 55a of the fixing member 55 (a portion of the fixing member 55 facing the pressure roller 51). In the fixing member 55, a holding member 57 is fixed to a portion 55B on the downstream side in the conveying direction (the direction of arrow B in fig. 2) of the sheet S.
The lubricant applying section 56 is disposed so as to contact the inner circumferential surface of the fixing belt 54. The lubricant applying portion 56 is disposed on the downstream side of the pad member 52 and on the upstream side of the heat roller 53 in the rotation direction of the fixing belt (the direction of arrow C in fig. 2).
The lubricant applying section 56 has a function of holding lubricant, and applies lubricant to the inner circumferential surface of the fixing belt 54. As the lubricant, a silicon-based or fluorine-based lubricant having high heat resistance can be used. As the lubricant application portion 56, fibrous materials having high heat resistance such as aramid fibers and fluorine fibers, porous materials having high heat resistance such as silicon sponge, felt members, and the like can be used.
The lubricant coating portion 56 is not limited to the above-described one, and may be a hard chromium plating layer or a plating layer in which fluorine resin is dispersed in a nickel plating solution and simultaneously deposited.
The lubricant applying portion 56 is provided with a 1 st downstream side end portion 561 positioned on the downstream side in the conveying direction of the sheet. The 1 st downstream end portion 561 is a portion of the lubricant applying portion 56 located on the most downstream side in the conveying direction. The heating roller 53 is disposed on the upstream side in the conveyance direction with respect to the 1 st downstream end 561.
A fixing belt 54 that passes through the nip portion N and faces the heat roller 53 is suspended from the holding member 57. The holding member 57 holds the lubricant applying portion 56. The holding member 57 has a housing recess 57a that houses the lubricant applying portion 56.
The holding member 57 is also provided with a 2 nd downstream end 571 located on the downstream side in the paper conveying direction. The 2 nd downstream end 571 is the portion of the holding member 57 located on the most downstream side in the conveying direction. The hot roller 53 is disposed on the upstream side in the conveyance direction with respect to the 2 nd downstream end 571. With such a configuration, a torque rise for rotating the fixing belt 54 can be suppressed.
Fig. 3 is a schematic cross-sectional view showing a peripheral structure of the lubricant applying portion of the embodiment. The structure around the lubricant application unit 56 will be described with reference to fig. 3.
As shown in fig. 3, the fixing device 50 includes a slide member 58. The sliding member 58 is provided on the downstream side of the lubricant application portion 56 and on the upstream side of the heat roller 53 in the rotation direction of the fixing belt 54 so that the inner peripheral surface of the fixing belt 54 can slide.
As the sliding member 58, a sheet-like member such as a fluororesin sheet can be used. The sliding member 58 is manufactured by, for example, plain-weaving glass fibers as a core material, impregnating a surface layer portion with a fluororesin, and then firing the resulting product. The thickness of the sliding member 58 is preferably 0.12mm or more and 0.15mm or less.
The holding member 57 has an opposing surface (surface layer portion) that opposes the inner peripheral surface of the fixing belt 54. The slide member 58 is joined to the facing surface. The slide member 58 is joined to the opposite surface by, for example, a heat-resistant double-sided tape.
The holding member 57 is provided with an extending portion 57b extending in the rotation direction of the fixing belt 54 on the downstream side of the lubricant applying portion 56 in the rotation direction. From the housing recess 57a to the extension 57b, a slide member 58 is joined. The frictional resistance of the slide member 58 is smaller than that of the above-described extension portion 57 b. This can reduce the frictional force acting when the fixing belt 54 slides on the sliding member 58.
Fig. 4 is a diagram showing a positional relationship between the meandering restricting member and the sliding member in the embodiment. Referring to fig. 4, the positional relationship between the meandering restricting member 71 and the sliding member 58 will be described.
As shown in fig. 4, the fixing device 50 includes an opposing roller 70 as an opposing member. The opposing roller 70 opposes the holding member 57 on the downstream side of the lubricant application section 56 in the rotation direction of the fixing belt 54. Specifically, the opposed roller 70 is disposed to be opposed to the extending portion 57b of the holding member 57. The opposing roller 70 is also disposed opposite the slide member 58 provided on the extension portion 57 b.
A pair of meandering restricting members 71 are provided at both ends of the rotation shaft of the opposing roller 70. The pair of meandering restricting members 71 abut against both ends of the fixing belt 54 in the width direction, and restrict the movement of the fixing belt 54 in the width direction.
The width of the sliding member 58 in the width direction of the fixing belt 54 is equal to or greater than the width of the fixing belt 54. By setting such a width relationship, even when the fixing belt 54 moves in the width direction, the fixing belt 54 can be stably brought into contact with the sliding member 58.
The slide member 58 is provided on the extension portion 57b so as to reach the position of the pair of meandering restricting members 71 in the width direction. This enables the fixing belt 54, the movement of which in the width direction is regulated by the meandering regulating member 71, to reliably slide on the sliding member 58.
As described above, in the fixing device 50 according to the embodiment, in the configuration in which the fixing belt 54 is laid over the heat roller 53 and the spacer member 52, the lubricant applying section 56 that applies the lubricant to the fixing belt 54 is disposed downstream of the spacer member 52, and the sliding member 58 is provided between the lubricant applying section 56 and the heat roller 53 so that the inner peripheral surface of the fixing belt 54 can slide. In such a configuration, the heat roller 53 is disposed on the upstream side in the conveying direction of the sheet S from the 1 st downstream side end 561 of the lubricant applying unit 56.
By setting the positional relationship between the hot roller 53 and the 1 st downstream end portion 561 as described above, the lubricant application portion 56 can be brought into stable contact with the inner peripheral surface of the fixing belt. This enables the lubricant to be stably supplied to the inner peripheral surface of the fixing belt 54. Further, by disposing the hot roller 53 suspending the fixing belt 54 on the upstream side in the sheet conveying direction, an increase in torque required to rotate the fixing belt 54 can be suppressed. Further, by providing the sliding member 58 on the upstream side of the heat roller 53 and on the downstream side of the lubricant application portion 56, the frictional resistance of the fixing belt 54 can be reduced compared to the case of direct contact with the holding member 57 that holds the lubricant application portion 56.
As described above, the fixing device 50 according to the embodiment can suppress damage to the fixing belt 54 by reducing the frictional force acting on the fixing belt 54 while suppressing an increase in the rotational torque applied to the fixing belt 54.
(verification experiment)
Hereinafter, a verification experiment performed to verify the effects of the present embodiment will be described. In the verification experiment, the fixing device in the comparative example and the fixing device in the example were prepared, and the torque of the driving source required to rotate the fixing belt was measured. Specifically, the torque of the drive source that rotates the pressure roller 51 is measured. More specifically, the fixing device in the comparative example and the fixing device in the example were prepared, the fixing belt 54 was moved, and the relationship between the moving distance of the fixing belt 54 and the torque was examined.
As the fixing device in the comparative example, a device in which the sliding member 58 is omitted from the fixing device 50 according to the embodiment was used. As the fixing device in the example, the fixing device 50 of the embodiment was used.
In the above measurement, the fixing temperature, the conveying speed, the number of printed sheets, and the pressure contact force were set as fixing conditions as follows. The fixing temperature at the nip N was set to 180 ℃. The transport speed of the transported paper sheet was set to 165 mm/sec or 300 mm/sec. The number of printed sheets was 36 sheets/minute at a transport speed of 165 mm/second, and 65 sheets/minute at a transport speed of 300 mm/second. The pressure roller 51 was pressed against the pad member 52 with a pressing force of 450N.
Fig. 5 is a diagram showing a relationship between a moving distance of the fixing belt and a torque in a comparative example. As shown in fig. 5, when the fixing device of the comparative example is used, the torque tends to increase as the moving distance of the fixing belt 54 increases. After the moving distance of the fixing belt 54 exceeds 500Km, the torque increases sharply, and when the moving distance of the fixing belt 54 is about 700Km, the torque exceeds 1.2N/m. That is, in the comparative example, the torque exceeds the reference value 1.2N/m as an index until the moving distance of the fixing belt 54 reaches 1200Km as the target distance.
Fig. 6 is a diagram showing a relationship between a moving distance of the fixing belt and a torque in the embodiment. As shown in fig. 6, in the fixing device in the embodiment, even when the moving distance of the fixing belt 54 is increased, the torque is not largely changed. Even when the moving distance of the fixing belt 54 reaches 1200Km, which is a target distance, the torque does not exceed the reference value 1.2N/m, which is an index.
The results of the above verification experiments confirmed that: by using the fixing device of the embodiment, the frictional force acting on the fixing belt 54 can be reduced, and an increase in torque of a driving source for rotating the fixing belt can be suppressed. In other words, it was confirmed that: by reducing the frictional force acting on the fixing belt 54, breakage of the fixing belt can be suppressed.
While the embodiments of the present invention have been described, the embodiments disclosed herein are illustrative in all respects and not restrictive. The scope of the present invention is indicated by the claims, and all changes that come within the meaning and range of equivalency of the claims are intended to be embraced therein.
Claims (8)
1. A fixing device includes:
a fixing member;
a heating member provided with a heat source;
an endless fixing belt rotatably mounted on the fixing member and the heating member;
a pressure member that is pressed against the fixing member via the fixing belt to form a nip portion for conveying a recording medium;
a lubricant applying section disposed downstream of the fixing member and upstream of the heating member in a rotation direction of the fixing belt, the lubricant applying section applying a lubricant to an inner circumferential surface of the fixing belt; and
a sliding member provided downstream of the lubricant application portion and upstream of the heating member in the rotation direction of the fixing belt so that the inner peripheral surface of the fixing belt is slidable,
the lubricant applying portion has a 1 st downstream side end portion located on a downstream side in a conveying direction of the recording medium,
the heating member is located upstream in the conveying direction from the 1 st downstream end.
2. The fixing device according to claim 1,
the pressing member is a pressing roller.
3. The fixing device according to claim 1 or 2, wherein,
the heating member is a heating roller having the heat source therein.
4. The fixing device according to any one of claims 1 to 3,
the width of the sliding member in the width direction of the fixing belt is equal to or greater than the width of the fixing belt.
5. The fixing device according to any one of claims 1 to 4, further comprising:
a holding member that holds the lubricant applying portion; and
a meandering restricting member that abuts an end surface of the fixing belt in a width direction and restricts movement of the fixing belt in the width direction,
the holding member has an extending portion extending in the rotation direction on a downstream side of the lubricant applying portion in the rotation direction of the fixing belt,
the frictional resistance of the sliding member is smaller than that of the extension portion,
the sliding member is provided on the extending portion so as to reach a position of the meandering restricting member in the width direction of the fixing belt.
6. The fixing device according to claim 5,
the holding member has a 2 nd downstream side end portion located on a downstream side in the conveying direction of the recording medium,
the heating member is located upstream in the conveying direction from the 2 nd downstream end.
7. The fixing device according to any one of claims 1 to 6,
the sliding member is a sheet member formed of a fluororesin.
8. An image forming apparatus includes:
an image forming unit for forming a toner image on an image carrier;
a transfer unit that transfers the toner image from the image bearing member to the recording medium; and
the fixing device according to any one of claims 1 to 7, wherein the toner image transferred onto the recording medium is fixed.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2018-203393 | 2018-10-30 | ||
| JP2018203393A JP7247518B2 (en) | 2018-10-30 | 2018-10-30 | Fixing device, image forming device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111123681A true CN111123681A (en) | 2020-05-08 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201911020152.7A Pending CN111123681A (en) | 2018-10-30 | 2019-10-25 | Fixing device and image forming apparatus |
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| JP (1) | JP7247518B2 (en) |
| CN (1) | CN111123681A (en) |
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| JP2008242177A (en) * | 2007-03-28 | 2008-10-09 | Konica Minolta Business Technologies Inc | Fixing device and image forming apparatus |
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| US20180011435A1 (en) * | 2016-07-08 | 2018-01-11 | Konica Minolta, Inc. | Fixing device and image forming apparatus |
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| JP2005077872A (en) * | 2003-09-02 | 2005-03-24 | Fuji Xerox Co Ltd | Fixing device and image forming apparatus |
| JP6784114B2 (en) * | 2016-09-21 | 2020-11-11 | コニカミノルタ株式会社 | Fixing device and image forming device |
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- 2018-10-30 JP JP2018203393A patent/JP7247518B2/en active Active
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| JP2005242113A (en) * | 2004-02-27 | 2005-09-08 | Canon Inc | Image heating apparatus and image forming apparatus |
| JP2008242177A (en) * | 2007-03-28 | 2008-10-09 | Konica Minolta Business Technologies Inc | Fixing device and image forming apparatus |
| CN103226317A (en) * | 2012-01-26 | 2013-07-31 | 株式会社理光 | Fixing device and endless belt assembly |
| US20150227096A1 (en) * | 2014-02-10 | 2015-08-13 | Kyocera Document Solutions Inc. | Fixing device and image forming apparatus |
| US20180011435A1 (en) * | 2016-07-08 | 2018-01-11 | Konica Minolta, Inc. | Fixing device and image forming apparatus |
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| Publication number | Publication date |
|---|---|
| JP7247518B2 (en) | 2023-03-29 |
| JP2020071279A (en) | 2020-05-07 |
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