WO2010024092A1 - 定着装置及び画像形成装置 - Google Patents
定着装置及び画像形成装置 Download PDFInfo
- Publication number
- WO2010024092A1 WO2010024092A1 PCT/JP2009/063733 JP2009063733W WO2010024092A1 WO 2010024092 A1 WO2010024092 A1 WO 2010024092A1 JP 2009063733 W JP2009063733 W JP 2009063733W WO 2010024092 A1 WO2010024092 A1 WO 2010024092A1
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- WIPO (PCT)
- Prior art keywords
- belt
- fixing device
- roller
- rollers
- image
- Prior art date
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Classifications
-
- 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
- G03G15/2053—Structural details of heat elements, e.g. structure of roller or belt, eddy current, induction heating
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
- G03G2215/00—Apparatus for electrophotographic processes
- G03G2215/20—Details of the fixing device or porcess
- G03G2215/2003—Structural features of the fixing device
- G03G2215/2016—Heating belt
- G03G2215/2041—Heating belt the fixing nip being formed by tensioning the belt over a surface portion of a pressure member
Definitions
- the present invention relates to a fixing device that fixes a toner image onto a sheet by applying pressure and heating while conveying a sheet carrying a toner image, and an image forming apparatus having the fixing unit.
- Many image forming apparatuses such as electrophotographic copying machines and printers fix a toner image on a sheet by pressurizing and heating a sheet carrying a toner image in a fixing unit.
- this fixing device generally performs fixing of an image while conveying a paper carrying a toner image by a nip portion formed by a roller which is a rotating body arranged oppositely.
- a roller which is a rotating body arranged oppositely.
- a fixing device using a belt as a rotating body can take a wide nip width, when a certain amount of heat is applied to a sheet carrying a toner image, the set temperature can be made lower than when a counter roller is used. it can.
- Such a feature brings about the merit that the rise time of the fixing device can be shortened and the release temperature range can be widened.
- the separation roller that presses the belt against the opposing rotating body at the exit of the nip portion is supported and rotated at both ends of the shaft, so that it bends in the axial direction and presses the belt against the opposing rotating body. May not be uniform, and the pressure at the center may be lower than at both ends of the belt.
- the problem of image distortion occurs due to non-uniform pressing in the axial direction.
- the diameter of the pressure roller is different between the central portion and both end portions of the belt, and the belt is slackened at the end having a smaller diameter than the central portion. Will cause wrinkles called undulations on the belt surface.
- Such wrinkles appear as uneven gloss on the image surface, which is a cause of image quality degradation.
- the present invention has been made in view of the above-described situation, and an object thereof is a fixing device that fixes an image at a nip portion formed by two rotating bodies that rotate opposite to each other, and the fixing device.
- one of the two rotating bodies of the fixing device may be a belt that is stretched and rotated by a plurality of rollers, and a roller having a crown shape may be disposed at the exit of the nip portion.
- An object of the present invention is to provide an image forming apparatus that does not cause gloss unevenness in printing.
- a fixing device that fixes an image at a nip formed by two rotating bodies that rotate opposite to each other, At least one of the two rotating bodies is a belt that is stretched and rotated by a plurality of rollers, Among the plurality of rollers, the roller disposed at the exit of the nip portion has a crown shape, A fixing device, wherein a slack absorbing member for absorbing slack at both ends of the belt caused by the roller having the crown shape is in contact with the belt.
- the slack absorbing member includes two rollers that are in contact with both end portions of the belt, and the two rollers can swing independently.
- an image forming apparatus having a fixing device that fixes an image at a nip formed by two rotating bodies that rotate opposite to each other. At least one of the two rotating bodies is a belt that is stretched and rotated by a plurality of rollers, Among the plurality of rollers, the roller disposed at the exit of the nip portion has a crown shape,
- An image forming apparatus wherein a slack absorbing member that absorbs slack at both ends of the belt caused by the crown-shaped roller is in contact with the belt.
- an image forming apparatus having a fixing device that fixes an image at a nip portion formed by two rotating bodies that rotate opposite to each other, one of the two rotating bodies is stretched and rotated by a plurality of rollers.
- the belt is configured such that the slack at both ends of the belt that occurs when the roller disposed at the exit of the nip portion of the plurality of rollers has a crown shape is eliminated.
- FIG. 1 is a conceptual diagram of an image forming apparatus.
- 2 is a block diagram illustrating a control relationship of the image forming apparatus.
- FIG. FIG. 3 is a diagram illustrating a configuration example of a fixing device. It is a conceptual diagram of the wrinkle which appears on a belt surface. It is a figure explaining absorption of the slack by a reverse crown-shaped roller. It is a figure explaining absorption of slack by two rollers which contact the end of a belt. It is a figure explaining absorption of the slack by a sliding member.
- FIG. 1 is a conceptual diagram of the image forming apparatus G.
- the color image forming apparatus G illustrated in the figure has a plurality of photoconductors 31Y, 31M, 31C, and 31K that are arranged in a row so as to face a single intermediate transfer belt 41 to form a full-color image. It is called a device.
- the color image forming apparatus G is provided with an automatic document feeder ADF on the top thereof.
- the documents D placed on the document placement table 103 of the automatic document feeder ADF are separated one by one, sent out to the document conveyance path, and conveyed by the conveyance drum 108.
- the image of the document D being conveyed is read by the document reading unit 1 at the document image reading position RP.
- the document D that has been read is discharged to a document discharge table 107 by a plurality of conveyance guides and a document discharge roller 105.
- the image forming apparatus G includes a document reading unit 1, exposure units 2Y, 2M, 2C, and 2K, image forming units 3Y, 3M, 3C, and 3K, an intermediate transfer unit 4, a fixing device 5, a reverse discharge unit 6, and a refeed.
- the unit 7, the paper feed unit 8, the operation display unit 9, the control unit C, and the like are housed in one housing.
- the document reading unit 1 irradiates the image of the document with the lamp L at the document reading position RP, guides the reflected light by the first mirror unit 11, the second mirror unit 12, and the lens 13, and receives the light receiving surface of the image sensor CCD. To form an image.
- the image signal photoelectrically converted by the image pickup device CCD is subjected to processing such as A / D conversion, shading correction, and compression by the image reading control unit 14 and is stored as image data in the memory of the control unit C.
- the image data stored in the memory is subjected to appropriate image processing according to the conditions set by the user, and output image data is generated.
- the exposure units 2Y, 2M, 2C, and 2K include a laser light source, a polygon mirror, a plurality of lenses, and the like, and generate a laser beam.
- the exposure units 2Y, 2M, 2C, and 2K are photosensitive elements that are constituent elements of the image forming units 3Y, 3M, 3C, and 3K corresponding to output information output based on the output image data sent from the control unit C.
- the surfaces of the bodies 31Y, 31M, 31C, and 31K are scanned and exposed with a laser beam.
- a latent image is formed on the photoconductors 31Y, 31M, 31C, and 31K by the scanning exposure of the laser beam.
- the image forming unit 3Y includes a photoconductor 31Y and a main charging unit 32Y, a developing unit 33Y, a first transfer roller 34Y, and a cleaning unit 35Y arranged around the photoconductor 31Y. The same applies to the photoconductors 31M, 31C, and 31K.
- the latent images on the photoreceptors 31Y, 31M, 31C, and 31K are developed by the corresponding developing units 33Y, 33M, 33C, and 33K, and toner images are formed on the photoreceptors.
- the toner images formed on the photoreceptors 31Y, 31M, 31C, and 31K are placed at predetermined positions on the intermediate transfer belt 41, which is an intermediate transfer body, by the first transfer rollers 34Y, 34M, 34C, and 34K of the intermediate transfer unit 4. Sequentially transferred.
- Residual toner is removed from the surface of the photoreceptor after the transfer of the toner image by the cleaning units 35Y, 35M, 35C and 35K.
- the toner image transferred onto the intermediate transfer belt 41 is conveyed from the sheet feeding trays PG1, PG2, and PG3 of the sheet feeding unit 8 by the second transfer roller 42, and timed by the sheet feeding roller 85. It is transferred to the fed paper P.
- the surface of the intermediate transfer belt 41 after the transfer of the toner image onto the paper P is cleaned by the belt cleaning unit 43 and is used for the next image transfer.
- the paper P carrying the toner image is sent to the fixing device 5 and is heated under pressure by a roller or a belt disposed oppositely, whereby the toner image is fixed on the paper P.
- the paper P that has been subjected to the fixing process by the fixing device 5 is guided by the reverse paper discharge unit 6 and discharged onto the paper discharge tray 65.
- the paper P When the paper P is reversed and discharged, the paper P is once guided downward by the paper discharge guide 62, the rear end of the paper P is sandwiched between the paper discharge reverse rollers 63, and then the paper P is reversed. The sheet is guided to the sheet discharge roller 64 by the sheet discharge guide 62 and discharged.
- the paper P on which image fixing on the front surface has been completed is conveyed by the paper guide member 66 to the refeeding section 7 below, and by the refeeding reverse roller 75. After pinching the rear end, the paper P is reversed by reverse feeding and sent to the refeed conveyance path 72 for image formation on the back surface.
- FIG. 2 is a block diagram showing the control relationship of the image forming apparatus G.
- the control unit C of the image forming apparatus G is a computer system having a CPU, a memory M, an arithmetic unit, an I / O port, a communication interface, a drive circuit, and the like.
- Control by the control unit C is performed by executing a predetermined program stored in the memory M.
- control unit C is connected to a network and can exchange information with other information processing devices.
- FIG. 3 is a diagram illustrating a configuration example of the fixing device 5.
- the illustrated fixing device 5 includes a fixing roller 51 having a heater therein, a belt 52, a separation roller 53, a steering roller 54, an inlet roller 55, a pressing pad 56, and the like, and a sheet that advances from the direction of an arrow x.
- the toner image is fixed by heating and heating while being conveyed.
- the fixing roller 51 may be a fixing belt 59 that is stretched over a plurality of rollers and heated as indicated by the dotted lines in FIG.
- the separation roller 53 disposed at the exit of the nip portion is a roller that presses the belt 52 against the fixing roller 51. However, the separation roller 53 bends as schematically shown by the dotted line in FIG. The pressing force on the belt becomes weaker than the pressing force on both ends of the belt.
- the separation roller 53 has a so-called crown shape in which the diameter of the central portion is larger than the diameter of both ends. Is adopted.
- the crown-shaped separation roller 53 the pressing force of the belt 52 to the fixing roller 51 is made uniform over the entire width of the belt 52.
- the winding method of the belt 52 is different between the central portion and both end portions. Will end up.
- Such a state generates wrinkles called ripples on the surface of the belt 52, and these wrinkles appear as uneven gloss on the image surface after fixing.
- FIG. 4 is a conceptual diagram of the wrinkles appearing on the belt surface.
- FIG. 4A shows a situation where slack is produced at both ends of the belt 52 wound around the fixing roller 51 having a crown shape
- FIGS. 4B and 4C show the belt surface.
- the shape of the corrugation which is a typical ridge S generated in FIG.
- FIG. 5 is a diagram for explaining the absorption of slack by the reverse crown roller 57.
- the reverse crown-shaped roller 57 shown in the figure is one of a plurality of rollers that stretch the belt 52, and is a slack absorbing member provided to absorb the slack of the belt 52 generated by the crown-shaped separation roller 53. is there.
- the reverse crown-shaped roller 57 is desirably supported so as to press the belt 52 with a pressing force having a magnitude determined in advance by experiments.
- the reverse crown-shaped roller 57 does not have to be a single continuous roller in the longitudinal direction as illustrated in FIG. 5, and is appropriately divided in the longitudinal direction, and each of the divided roller portions is independent.
- the roller may be configured to contact the belt. Examples are given below.
- FIG. 6 is a diagram for explaining the absorption of slack by the two rollers 61 and 71 that are in contact with the end portion of the belt 52.
- Both ends of the two rollers 61 and 71 are supported by roller support members 62 and 72 and can swing independently.
- the rollers 61 and 62 are in contact with both end portions of the inner peripheral surface of the belt 52, respectively.
- the slack absorbing member is configured such that the shafts of the two rollers 61 and 71 can be displaced in a direction substantially perpendicular to the conveying direction of the belt 52 and are configured to press the belt 52 outward by a load applied by an elastic member such as a spring. It is.
- FIG. 7 is a diagram for explaining the absorption of slack by the sliding members 81 and 91.
- the sliding members 81 and 91 are slack absorbing members that are in sliding contact with both ends of the belt 52 by springs 82 and 92 that are elastic members, respectively.
- the slack absorbing member that absorbs the slack of the belt 52 has been described.
- the direction in which the slack absorbing member presses the belt 52 is, as illustrated, the inner peripheral surface of the belt 52. You may make it go to the outside from the side, and you may press it so that it may go to the inside from the outer peripheral surface side of the belt 52.
- the position where the slack absorbing member is pressed against the belt 52 does not have to be in the vicinity of the separation roller 53 as illustrated in FIGS. 5, 6, and 7, and may be in the vicinity of the inlet roller 55. It is determined in consideration of the tension form and absorption effect.
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Fixing For Electrophotography (AREA)
Abstract
Description
前記二つの回転体のうちの少なくとも一つは、複数のローラにより張架されて回転するベルトであって、
前記複数のローラのうち、前記ニップ部の出口に配置されるローラはクラウン形状を有するものであり、
前記ベルトには、前記クラウン形状を有するローラにより生ずるベルト両端部の弛みを吸収する弛み吸収部材が当接されていることを特徴とする定着装置。
前記二つの回転体のうちの少なくとも一つは、複数のローラにより張架されて回転するベルトであって、
前記複数のローラのうち、前記ニップ部の出口に配置されるローラはクラウン形状を有するものであり、
前記ベルトには、前記クラウン形状を有するローラにより生ずるベルト両端部の弛みを吸収する弛み吸収部材が当接されていることを特徴とする画像形成装置。
52 ベルト
53 分離ローラ
57 逆クラウン状のローラ(弛み吸収部材)
61、71 ローラ(弛み吸収部材)
81、91 摺動部材(弛み吸収部材)
82、92 バネ(弾性部材)
G 画像形成装置
Claims (6)
- 対向して回転する二つの回転体により形成されたニップ部にて画像の定着を行う定着装置において、
前記二つの回転体のうちの少なくとも一つは、複数のローラにより張架されて回転するベルトであって、
前記複数のローラのうち、前記ニップ部の出口に配置されるローラはクラウン形状を有するものであり、
前記ベルトには、前記クラウン形状を有するローラにより生ずるベルト両端部の弛みを吸収する弛み吸収部材が当接されていることを特徴とする定着装置。 - 前記弛み吸収部材は前記複数のローラの一つであって、逆クラウン形状を有するものであることを特徴とする請求項1に記載の定着装置。
- 前記弛み吸収部材は、前記ベルトの両端部にそれぞれ当接する二つのローラであって、前記二つのローラは独立して揺動可能なものであることを特徴とする請求項1に記載の定着装置。
- 前記弛み吸収部材が前記ベルトの両端部にそれぞれ摺接する二つの摺動部材であることを特徴とする請求項1に記載の定着装置。
- 前記摺動部材は、弾性部材により前記ベルトに押圧されていることを特徴とする請求項4に記載の定着装置。
- 対向して回転する二つの回転体により形成されたニップ部にて画像の定着を行う定着装置を有する画像形成装置において、
前記二つの回転体のうちの少なくとも一つは、複数のローラにより張架されて回転するベルトであって、
前記複数のローラのうち、前記ニップ部の出口に配置されるローラはクラウン形状を有するものであり、
前記ベルトには、前記クラウン形状を有するローラにより生ずるベルト両端部の弛みを吸収する弛み吸収部材が当接されていることを特徴とする画像形成装置。
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
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US12/810,825 US8331841B2 (en) | 2008-08-29 | 2009-08-03 | Fixing device and image forming apparatus |
JP2010510009A JP5035414B2 (ja) | 2008-08-29 | 2009-08-03 | 定着装置及び画像形成装置 |
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JP2008-221038 | 2008-08-29 | ||
JP2008221038 | 2008-08-29 |
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PCT/JP2009/063733 WO2010024092A1 (ja) | 2008-08-29 | 2009-08-03 | 定着装置及び画像形成装置 |
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JP (1) | JP5035414B2 (ja) |
WO (1) | WO2010024092A1 (ja) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
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JP2015197635A (ja) * | 2014-04-02 | 2015-11-09 | キヤノン株式会社 | 画像形成装置 |
JP2015200875A (ja) * | 2014-04-02 | 2015-11-12 | キヤノン株式会社 | 画像形成装置 |
JP2015206864A (ja) * | 2014-04-18 | 2015-11-19 | キヤノン株式会社 | 画像形成装置、及び転写ベルトユニット |
Families Citing this family (3)
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JP5531676B2 (ja) * | 2010-03-03 | 2014-06-25 | 株式会社リコー | 定着装置及び画像形成装置 |
US9658577B2 (en) | 2014-04-02 | 2017-05-23 | Canon Kabushiki Kaisha | Image forming apparatus having transfer belt rollers of specific shapes |
JP6643012B2 (ja) * | 2015-08-31 | 2020-02-12 | キヤノン株式会社 | ベルト搬送装置及び画像形成装置 |
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2009
- 2009-08-03 WO PCT/JP2009/063733 patent/WO2010024092A1/ja active Application Filing
- 2009-08-03 JP JP2010510009A patent/JP5035414B2/ja active Active
- 2009-08-03 US US12/810,825 patent/US8331841B2/en active Active
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JPH0710334A (ja) * | 1993-06-21 | 1995-01-13 | Bridgestone Corp | 蛇行修正装置 |
JP2001201979A (ja) * | 2000-01-20 | 2001-07-27 | Fuji Xerox Co Ltd | 画像定着装置 |
JP2007079049A (ja) * | 2005-09-13 | 2007-03-29 | Canon Inc | 定着装置 |
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JP2015197635A (ja) * | 2014-04-02 | 2015-11-09 | キヤノン株式会社 | 画像形成装置 |
JP2015200875A (ja) * | 2014-04-02 | 2015-11-12 | キヤノン株式会社 | 画像形成装置 |
JP2015206864A (ja) * | 2014-04-18 | 2015-11-19 | キヤノン株式会社 | 画像形成装置、及び転写ベルトユニット |
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JPWO2010024092A1 (ja) | 2012-01-26 |
JP5035414B2 (ja) | 2012-09-26 |
US20110135354A1 (en) | 2011-06-09 |
US8331841B2 (en) | 2012-12-11 |
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