JP5846281B2

JP5846281B2 - Peeling device, fixing device using the same, and image forming apparatus

Info

Publication number: JP5846281B2
Application number: JP2014219925A
Authority: JP
Inventors: 翔渡邊; 市川　順一; 順一市川; 淳平天野; 彩柿島; 誠也中津原
Original assignee: Fuji Xerox Co Ltd; Fujifilm Business Innovation Corp
Current assignee: Fujifilm Business Innovation Corp
Priority date: 2009-10-02
Filing date: 2014-10-29
Publication date: 2016-01-20
Anticipated expiration: 2030-09-02
Also published as: JP2015018286A

Description

本発明は、剥離装置及びこれを用いた定着装置、画像形成装置に関する。 The present invention relates to a peeling device, a fixing device using the same, and an image forming apparatus.

従来における剥離装置を付加した定着装置としては例えば特許文献１，２に記載のものが既に提案されている。
特許文献１は、剥離パッドが押圧面よりも定着ベルトの移動方向下流側に配設された湾曲面を備え、加圧ロールに対する定着ベルトの加圧を解除する位置を湾曲面と加圧ロールとの間に配置するようにしたものである。
特許文献２は、剥離パッドが定着ロールと対向する下辺部の角に、エッジ部と、異物収容凹部としての収容凹部とを備え、定着ベルトの内面に付着した摩耗粉等の異物を、エッジ部で掻き取って収容凹部内に収容するものである。 As conventional fixing devices to which a peeling device is added, for example, those described in Patent Documents 1 and 2 have been proposed.
Patent Document 1 includes a curved surface in which the peeling pad is disposed downstream of the pressing surface in the moving direction of the fixing belt, and the position where the pressure of the fixing belt against the pressure roll is released is determined by the curved surface and the pressure roll. It is arranged between.
Patent Document 2 is provided with an edge portion and a housing concave portion as a foreign matter housing concave portion at a corner of a lower side portion where the peeling pad faces the fixing roll, and removes foreign matter such as abrasion powder adhering to the inner surface of the fixing belt from the edge portion. Is scraped off and accommodated in the accommodating recess.

特開２００８−２３３２３２号公報（発明を実施するための最良の形態，図３）JP 2008-233232 A (Best Mode for Carrying Out the Invention, FIG. 3) 特開２００７−１１４６９８号公報（発明を実施するための最良の形態，図５）JP 2007-114698 A (Best Mode for Carrying Out the Invention, FIG. 5)

本発明の技術的課題は、ベルト状回転体と加圧回転体との接触域を通過する記録材を、ベルト状回転体から剥離するに当たり、記録材に対する剥離部位での加圧分布を良好に保つことが可能な剥離装置及びこれを用いた定着装置、画像形成装置を提供するものである。 The technical problem of the present invention is that when the recording material passing through the contact area between the belt-like rotator and the pressure rotator is peeled off from the belt-like rotator, the pressure distribution at the peeling portion with respect to the recording material is improved. A peeling device that can be maintained, a fixing device using the same, and an image forming apparatus are provided.

請求項１に係る発明は、ベルト状回転体と前記ベルト状回転体に接触して配置される加圧回転体との間の接触域の前記ベルト状回転体の移動方向における下流側に設けられ、前記ベルト状回転体の内側にて前記ベルト状回転体を介して前記接触域を形成するように配置され且つ前記ベルト状回転体に貼り付く記録材を剥離する剥離装置であって、前記ベルト状回転体の移動方向に交差する幅方向に沿って長く延びるように設けられるとともに、前記ベルト状回転体が前記加圧回転体側に接触するように前記ベルト状回転体を押圧する押圧部材と、前記押圧部材の前記加圧回転体側に設けられ且つ前記ベルト状回転体に屈曲部を形成するとともに、前記屈曲部が前記加圧回転体に食い込むように前記ベルト状回転体を案内する案内部と、前記押圧部材の前記加圧回転体側に設けられ且つ前記押圧部材の長手方向における中央部から端部に向かうに従い前記加圧回転体から離れるように形成され、前記加圧回転体に対して前記ベルト状回転体を加圧し前記接触域を形成する加圧部と、前記押圧部材の加圧回転体側で、ベルト状回転体の移動方向と交差する交差方向に対し中央部が両端部よりも前記接触域の上流側に向かって凸状に突出する突出部と、を備えたことを特徴とする剥離装置である。 The invention according to claim 1 is provided on the downstream side in the moving direction of the belt-shaped rotating body in the contact area between the belt-shaped rotating body and the pressure rotating body arranged in contact with the belt-shaped rotating body. A peeling device arranged to form the contact area via the belt-like rotator inside the belt-like rotator and peeling a recording material attached to the belt-like rotator, A pressing member that is provided so as to extend long along a width direction that intersects the moving direction of the belt-shaped rotating body, and that presses the belt-shaped rotating body so that the belt-shaped rotating body is in contact with the pressure rotating body side; A guide portion that is provided on the pressure rotating body side of the pressing member and forms a bent portion in the belt-shaped rotating body, and guides the belt-shaped rotating body so that the bent portion bites into the pressure rotating body; , Press A member is provided on the pressure rotator side of the member, and is formed so as to be separated from the pressure rotator as it goes from the center to the end in the longitudinal direction of the pressing member, and the belt-like rotation with respect to the pressure rotator A pressure part that pressurizes the body to form the contact area; and a pressure rotating body side of the pressing member, and a center part of the contact area in the crossing direction intersecting the moving direction of the belt-like rotating body is more than the both end parts. And a protruding portion protruding in a convex shape toward the upstream side.

請求項２に係る発明は、請求項１に係る剥離装置において、前記案内部は、前記押圧部材の長手方向における中央部から端部において、前記加圧回転体に食い込むように前記ベルト状回転体を案内することを特徴とする剥離装置である。
請求項３に係る発明は、請求項１又は２に係る剥離装置において、前記押圧部材は、予め決められた支持部位に支持される被支持部材とこの被支持部材のベルト状回転体との接触面に沿って設けられる剥離部材とで構成されていることを特徴とする剥離装置である。
請求項４に係る発明は、請求項１ないし３いずれかに係る剥離装置において、前記押圧部材はベルト状回転体が保持可能な保持部材に対し支持部材を介して固定的に支持されることを特徴とする剥離装置である。
請求項５に係る発明は、請求項１ないし４いずれかに係る剥離装置において、前記押圧部材のうち前記ベルト状回転体との接触面は当該ベルト状回転体との間の摩擦力が低減可能な潤滑層を有することを特徴とする剥離装置である。 The invention according to claim 2 is the peeling device according to claim 1, wherein the guide portion is configured to bite into the pressure rotator from a center portion to an end portion in a longitudinal direction of the pressing member. It is the peeling apparatus characterized by guiding.
According to a third aspect of the present invention, in the peeling apparatus according to the first or second aspect, the pressing member is a contact between a supported member supported by a predetermined supporting portion and a belt-like rotating body of the supported member. A peeling device comprising a peeling member provided along a surface.
According to a fourth aspect of the present invention, in the peeling device according to any one of the first to third aspects, the pressing member is fixedly supported via a support member with respect to a holding member that can be held by the belt-like rotating body. It is the peeling apparatus characterized.
According to a fifth aspect of the present invention, in the peeling device according to any one of the first to fourth aspects, the frictional force between the pressing member and the contact surface with the belt-shaped rotating body can be reduced. It is a peeling apparatus characterized by having a proper lubricating layer.

請求項６に係る発明は、請求項１に係る剥離装置において、前記突出部は前記交差方向中央部を中心に対称的且つ湾曲状に形成されていることを特徴とする剥離装置である。
請求項７に係る発明は、請求項１に係る剥離装置において、前記突出部はその先端が断面曲面状に形成されていることを特徴とする剥離装置である。 The invention according to claim 6 is the peeling apparatus according to claim 1, wherein the protruding portion is formed symmetrically and curved around the central portion in the intersecting direction.
The invention according to claim 7 is the peeling apparatus according to claim 1, wherein the protruding portion is formed with a tip having a curved cross-section.

請求項８に係る発明は、少なくとも表面が加熱されて回転するベルト状加熱回転体と、この加熱回転体の表面に加圧接触されて加熱回転体と共に転動し且つ加熱回転体との間にて記録材を挟持搬送して記録材上の未定着トナー像を加熱加圧定着する加圧回転体と、少なくとも加熱回転体に貼り付く記録材を剥離する請求項１ないし７いずれかに係る剥離装置と、を備えたことを特徴とする定着装置である。
請求項９に係る発明は、記録材上に未定着トナー像を形成するトナー像作製装置と、このトナー像作製装置にて作製された記録材上の未定着トナー像を定着する請求項８に係る定着装置と、を備えたことを特徴とする画像形成装置である。 According to an eighth aspect of the present invention, there is provided a belt-like heating rotator that rotates with at least a surface being heated, and a pressure contact with the surface of the heating rotator to roll together with the heating rotator and between the heating rotator. 8. The peeling according to claim 1, wherein the pressure rotating body for sandwiching and conveying the recording material to heat and pressure-fix the unfixed toner image on the recording material and the recording material attached to at least the heating rotating body are peeled off. And a fixing device.
According to a ninth aspect of the present invention, there is provided a toner image producing apparatus for forming an unfixed toner image on a recording material, and fixing an unfixed toner image on the recording material produced by the toner image producing apparatus. An image forming apparatus comprising the fixing device.

請求項１に係る発明によれば、ベルト状回転体と加圧回転体との接触域を通過する記録材を、ベルト状回転体から剥離するに当たり、本構成を有さない態様に比べて、記録材に対する剥離部位での加圧分布をより良好に保つことができる。
請求項２に係る発明によれば、本構成を有さない態様に比べて、加圧回転体に対するベルト状回転体の食い込み状態を安定させることができる。
請求項３に係る発明によれば、剥離装置の各機能部を簡単に構成することができる。
請求項４に係る発明によれば、本構成を有さない態様に比べて、押圧部材の位置を正確に維持することができ、その分、押圧部材の相対的移動に伴う加圧回転体との接触状態が変動する事態を有効に回避することができる。
請求項５に係る発明によれば、本構成を有さない場合に比べて、ベルト状回転体と押圧部材との間の接触抵抗を低下させ、ベルト状回転体の剥離挙動を安定させることができる。
請求項６に係る発明によれば、通過した記録材に対し、記録材の搬送方向から押し広げる方向に記録材を押し広げることができ、これに伴って、記録材のしわの発生を抑制することができる。
請求項７に係る発明によれば、本構成を有さない場合に比べて、ベルト状回転体が剥離装置の突出部先端に引っ掛かる懸念が少なく、ベルト状回転体の移動を安定させることができる。
請求項８に係る発明によれば、ベルト状加熱回転体と加圧回転体との接触域を通過する記録材を、ベルト状加熱回転体から剥離するに当たり、本構成の剥離装置を有さない態様に比べて、記録材に対する剥離部位での加圧分布をより良好に保つことができ、加圧不足に伴う画像品質不良を回避することができる。
請求項９に係る発明によれば、ベルト状加熱回転体と加圧回転体との接触域を通過する記録材を、ベルト状加熱回転体から剥離するに当たり、本構成の剥離装置を有さない態様に比べて、記録材に対する剥離部位での加圧分布をより良好に保つことができ、加圧不足に伴う画像品質不良を回避することが可能な定着装置を用いた画像形成装置を簡単に構築することができる。 According to the first aspect of the present invention, when the recording material passing through the contact area between the belt-like rotator and the pressure rotator is peeled from the belt-like rotator, compared to an aspect without this configuration, The pressurization distribution at the peeling site with respect to the recording material can be kept better.
According to the invention which concerns on Claim 2, compared with the aspect which does not have this structure, the biting state of the belt-like rotary body with respect to a pressurization rotary body can be stabilized.
According to the invention which concerns on Claim 3, each function part of a peeling apparatus can be comprised easily.
According to the invention which concerns on Claim 4, compared with the aspect which does not have this structure, the position of a press member can be maintained correctly, and the pressurization rotary body accompanying the relative movement of a press member and the part It is possible to effectively avoid a situation in which the contact state of the battery fluctuates.
According to the invention which concerns on Claim 5, compared with the case where it does not have this structure, the contact resistance between a belt-like rotary body and a press member can be reduced, and the peeling behavior of a belt-like rotary body can be stabilized. it can.
According to the sixth aspect of the invention, the recording material can be expanded in the direction of expanding the recording material that has passed from the conveying direction of the recording material, and accordingly, generation of wrinkles of the recording material is suppressed. be able to.
According to the invention which concerns on Claim 7, compared with the case where it does not have this structure, there is little fear that a belt-like rotary body will be caught by the protrusion part protrusion part of a peeling apparatus, and the movement of a belt-like rotary body can be stabilized. .
According to the eighth aspect of the present invention, when the recording material passing through the contact area between the belt-like heating rotator and the pressure rotator is peeled from the belt-like heating rotator, the peeling device having this configuration is not provided. Compared with the aspect, the pressurization distribution at the peeling site with respect to the recording material can be kept better, and the image quality defect due to insufficient pressurization can be avoided.
According to the ninth aspect of the present invention, the recording material passing through the contact area between the belt-shaped heating rotator and the pressure rotator is not separated from the belt-shaped heating rotator. Compared to the embodiment, an image forming apparatus using a fixing device that can maintain a better pressure distribution at the peeling site with respect to the recording material and can avoid image quality defects due to insufficient pressurization can be easily obtained. Can be built.

（ａ）は本発明が適用される定着装置の実施の形態の概要を示す説明図、（ｂ）はその剥離装置の要部を示す説明図、（ｃ）は（ｂ）中の剥離部材を示す斜視図、（ｄ）は（ｃ）中Ｄ−Ｄ線に相当する断面図である。(A) is explanatory drawing which shows the outline | summary of embodiment of the fixing device to which this invention is applied, (b) is explanatory drawing which shows the principal part of the peeling apparatus, (c) is the peeling member in (b). The perspective view shown and (d) are sectional drawings equivalent to the DD line in (c). 実施の形態１に係る画像形成装置の全体構成を示す説明図である。1 is an explanatory diagram illustrating an overall configuration of an image forming apparatus according to a first embodiment. 実施の形態１で用いられる定着装置の詳細を示す説明図である。2 is an explanatory diagram illustrating details of a fixing device used in Embodiment 1. FIG. 実施の形態１で用いられる剥離装置の詳細を示す説明図である。It is explanatory drawing which shows the detail of the peeling apparatus used in Embodiment 1. FIG. （ａ）は剥離装置の押圧パッドを示す斜視図、（ｂ）は（ａ）中Ｂ方向から見た矢視図である。尚、図中、符号ｘ，ｙ，ｚは空間の３軸（ｘ軸、ｙ軸、ｚ軸）方向を示す。(A) is a perspective view which shows the press pad of a peeling apparatus, (b) is the arrow line view seen from B direction in (a). In the figure, reference numerals x, y, and z indicate the directions of three axes (x axis, y axis, and z axis) in space. （ａ）は押圧パッドの一要素である剥離部材の斜視図、（ｂ）は（ａ）中Ｂ方向から見た矢視図、（ｃ）は（ｂ）中Ｃ方向から見た矢視図、（ｄ）は（ａ）中Ｄ−Ｄ線に相当する断面図、（ｅ）は比較の形態に係る剥離部材を示す斜視図である。尚、図中、符号ｘ，ｙ，ｚは空間の３軸（ｘ軸、ｙ軸、ｚ軸）方向を示す。(A) is the perspective view of the peeling member which is one element of a press pad, (b) is the arrow view seen from B direction in (a), (c) is the arrow view seen from C direction in (b). (D) is sectional drawing equivalent to the DD line in (a), (e) is a perspective view which shows the peeling member which concerns on a comparison form. In the figure, reference numerals x, y, and z indicate the directions of three axes (x axis, y axis, and z axis) in space. （ａ）は剥離装置の押圧パッドの取付構造の一例を示す説明図、（ｂ）は前記取付構造の他の例を示す説明図である。(A) is explanatory drawing which shows an example of the attachment structure of the press pad of a peeling apparatus, (b) is explanatory drawing which shows the other example of the said attachment structure. （ａ）は剥離装置の押圧パッドと加圧ロールとの相対位置関係を模式的に示す説明図、（ｂ）は押圧パッドのプロセス方向位置と圧力との関係を示す説明図である。(A) is explanatory drawing which shows typically the relative positional relationship of the press pad and pressurization roll of a peeling apparatus, (b) is explanatory drawing which shows the relationship between the process direction position and pressure of a press pad. （ａ）は加圧ロールに対し剥離装置の押圧パッドを食い込ませない比較の形態の概要を示す説明図、（ｂ）は（ａ）中のＢ部を拡大した説明図、（ｃ）は（ｂ）中の無加圧領域で生ずる現象を模式的に示す説明図である。(A) is explanatory drawing which shows the outline | summary of the comparative form which does not bite the press pad of a peeling apparatus with respect to a pressure roll, (b) is explanatory drawing which expanded the B section in (a), (c) is ( It is explanatory drawing which shows typically the phenomenon which arises in the no-pressurization area | region in b). （ａ）は定着装置を上方から見たレイアウトを模式的に示す説明図、（ｂ）は加圧領域が平面状である押圧パッドを用いた態様の定着ニップ域の圧力分布を模式的に示す説明図、（ｃ）は実施の形態１に係る加圧部が付加された押圧パッドを用いた態様の圧力分布を模式的に示す説明図である。(A) is explanatory drawing which shows typically the layout which looked at the fixing apparatus from the upper part, (b) shows typically the pressure distribution of the fixing nip area | region of the aspect using the press pad whose pressurization area | region is planar. Explanatory drawing, (c) is explanatory drawing which shows typically the pressure distribution of the aspect using the press pad to which the pressurization part which concerns on Embodiment 1 was added. （ａ）は突出部が付加された押圧パッドを用いた態様の圧力分布を模式的に示す説明図、（ｂ）は突出部がない押圧パッドを用いた態様の圧力分布を模式的に示す説明図である。(A) is explanatory drawing which shows typically the pressure distribution of the aspect using the press pad to which the protrusion part was added, (b) is explanatory drawing which shows typically the pressure distribution of the aspect using the press pad without a protrusion part. FIG. （ａ）は定着ニップ域を通過する用紙の搬送状態の一例を示す説明図、（ｂ）は実施の形態１において、突出部が付加された押圧パッドを用いた態様による用紙への作用を示す説明図、（ｃ）は突出部の先端湾曲面の曲率を変化させた態様による用紙への作用の変化を示す説明図である。(A) is explanatory drawing which shows an example of the conveyance state of the paper which passes a fixing nip area, (b) shows the effect | action to the paper by the aspect using the press pad to which the protrusion part was added in Embodiment 1. FIG. Explanatory drawing, (c) is explanatory drawing which shows the change of the effect | action to the paper by the aspect which changed the curvature of the front end curved surface of a protrusion part. （ａ）は実施の形態１において、突出部が付加された押圧パッドを用いた態様の概要を示す説明図、（ｂ）は突出部の先端断面形状が曲面状である場合における（ａ）中Ｂ部の詳細を示す説明図、（ｃ）は突出部の先端断面形状が平坦状である場合における（ａ）中Ｂ部の詳細を示す説明図である。(A) is explanatory drawing which shows the outline | summary of the aspect using the press pad to which the protrusion part was added in Embodiment 1, (b) is in (a) in the case where the front end cross-sectional shape of a protrusion part is a curved surface shape. Explanatory drawing which shows the detail of B part, (c) is explanatory drawing which shows the detail of B part in (a) in case the front-end | tip cross-sectional shape of a protrusion part is flat shape. （ａ）は定着ベルトの搬送動作が不安定になる状況を模式的に示す説明図、（ｂ）は押圧パッドの一要素である剥離部材の表面構成例を示す説明図である。(A) is explanatory drawing which shows typically the condition where conveyance operation of a fixing belt becomes unstable, (b) is explanatory drawing which shows the surface structural example of the peeling member which is one element of a press pad. （ａ）は実施の形態２で用いられる押圧パッドの一要素である剥離部材を示す斜視図、（ｂ）は（ａ）中Ｂ方向から見た矢視図、（ｃ）は（ｂ）中Ｃ方向から見た矢視図、（ｄ）は（ａ）中Ｄ−Ｄ線に相当する断面図である。尚、図中、符号ｘ，ｙ，ｚは空間の３軸（ｘ軸、ｙ軸、ｚ軸）方向を示す。(A) is a perspective view which shows the peeling member which is one element of the press pad used in Embodiment 2, (b) is an arrow view seen from the B direction in (a), (c) is in (b) The arrow view seen from the C direction, (d) is a cross-sectional view corresponding to the DD line in (a). In the figure, reference numerals x, y, and z indicate the directions of three axes (x axis, y axis, and z axis) in space. （ａ）は実施例に係る剥離装置を用いた際の定着ニップ域での圧力分布の一例を示す説明図、（ｂ）は比較例に係る剥離装置を用いた際の定着ニップ域での圧力分布の一例を示す説明図である。(A) is explanatory drawing which shows an example of the pressure distribution in the fixing nip area at the time of using the peeling apparatus which concerns on an Example, (b) is the pressure in the fixing nip area at the time of using the peeling apparatus which concerns on a comparative example. It is explanatory drawing which shows an example of distribution.

◎実施の形態の概要
図１（ａ）は本発明が適用される定着装置の実施の形態の概要を示す説明図であり、この種の定着装置は例えば電子写真方式を採用した画像形成装置などに用いられる。
この場合、画像形成装置は、記録材上に未定着トナー像を形成するトナー像作製装置と、このトナー像作製装置にて作製された記録材上の未定着トナー像を定着する定着装置と、を備えるものである。
同図において、定着装置１０は、少なくとも表面が加熱されて回転するベルト状加熱回転体（ベルト状回転体に相当）１１と、この加熱回転体１１の表面に加圧接触されて加熱回転体１１と共に転動し且つ加熱回転体１１との間にて記録材を挟持搬送して記録材上の未定着トナー像を加熱加圧定着する加圧回転体１２と、少なくとも加熱回転体１１に貼り付く記録材を剥離する剥離装置１と、を備えたものである。
尚、図１（ａ）において、符号１３は加圧回転体１２との間で加熱回転体（ベルト状回転体）１１を挟持搬送すると共に前記加熱回転体１１を加熱する加熱源であるが、加熱回転体１１を加熱する方式はこれに限られるものではなく、加熱回転体１１を張架搬送する他の張架部材や加熱回転体に接触又は非接触配置される加熱部材を加熱源としてもよいことは勿論である。 Outline of Embodiment FIG. 1A is an explanatory diagram showing an outline of an embodiment of a fixing device to which the present invention is applied. This type of fixing device is, for example, an image forming apparatus employing an electrophotographic system. Used for.
In this case, the image forming apparatus includes a toner image producing device that forms an unfixed toner image on a recording material, a fixing device that fixes an unfixed toner image on the recording material produced by the toner image producing device, and Is provided.
In FIG. 1, a fixing device 10 includes a belt-like heating rotator (corresponding to a belt-like rotator) 11 that rotates with at least the surface being heated, and the surface of the heating rotator 11 in pressure contact with the heating rotator 11. At the same time, the recording material is sandwiched and conveyed between the heating rotator 11 and the heating rotator 11, and the unfixed toner image on the recording material is heated and fixed by pressure. And a peeling device 1 for peeling the recording material.
In FIG. 1A, reference numeral 13 denotes a heating source that sandwiches and conveys the heating rotator (belt-like rotator) 11 with the pressurizing rotator 12 and heats the heating rotator 11. The method of heating the heating rotator 11 is not limited to this, and other heating members that stretch and convey the heating rotator 11 and heating members that are in contact with or not in contact with the heating rotator may be used as a heating source. Of course it is good.

本実施の形態において、剥離装置１の基本的構成は、図１（ｂ）〜（ｄ）に示すように、ベルト状回転体１１と前記ベルト状回転体１１に接触して配置される加圧回転体１２との間の接触域の前記ベルト状回転体１１の移動方向における下流側に設けられ、前記ベルト状回転体１１の内側にて前記ベルト状回転体１１を介して前記接触域を形成するように配置され且つ前記ベルト状回転体１１に貼り付く記録材を剥離するものであって、前記ベルト状回転体１１の移動方向に交差する幅方向に沿って長く延びるように設けられるとともに、前記ベルト状回転体１１が前記加圧回転体１２側に接触するように前記ベルト状回転体１１を押圧する押圧部材２と、前記押圧部材２の前記加圧回転体１２側に設けられ且つ前記ベルト状回転体１１に屈曲部を形成するとともに、前記屈曲部が前記加圧回転体１２に食い込むように前記ベルト状回転体１１を案内する案内部３と、前記押圧部材２の前記加圧回転体１２側に設けられ且つ前記押圧部材２の長手方向における中央部から端部に向かうに従い前記加圧回転体１２から離れるように形成され、前記加圧回転体１２に対して前記ベルト状回転体１１を加圧し前記接触域を形成する加圧部４と、を備えたものである。 In the present embodiment, as shown in FIGS. 1B to 1D, the basic configuration of the peeling device 1 is a belt-like rotating body 11 and a pressurization arranged in contact with the belt-like rotating body 11. Provided on the downstream side in the moving direction of the belt-shaped rotating body 11 in the contact area with the rotating body 12, and forms the contact area inside the belt-shaped rotating body 11 via the belt-shaped rotating body 11. The recording material that is arranged so as to adhere to the belt-like rotating body 11 is peeled off, and is provided so as to extend long along the width direction intersecting the moving direction of the belt-like rotating body 11, A pressing member 2 that presses the belt-shaped rotating body 11 so that the belt-shaped rotating body 11 contacts the pressure rotating body 12; a pressing member 2 that is provided on the pressure rotating body 12 side; Bent to belt-like rotating body 11 A guide portion 3 that guides the belt-like rotator 11 so that the bent portion bites into the pressurizing rotator 12, and provided on the pressing rotator 12 side of the pressing member 2; The pressing member 2 is formed so as to move away from the pressurizing rotary body 12 from the center to the end in the longitudinal direction, and pressurizes the belt-like rotary body 11 against the pressurizing rotary body 12 to thereby contact the contact area. And a pressurizing part 4 for forming

このような技術的手段において、押圧部材２としては、後述するように、被支持部材２ａと剥離部材２ｂとに分離した態様でもよいし、これらを一体化したものでもよい。
また、案内部３としては、加圧回転体１２に対してベルト状回転体１１の屈曲形状角部が食い込むものであれは適宜選定して差し支えなく、押圧部材２の取付位置と加圧回転体１２との相対位置関係を考慮して設けるようにすればよい。
更に、加圧部４としては、押圧部材２の長手方向における中央部から端部に向かうに従い、押圧部材２の加圧回転体１２側の面が前記加圧回転体１２から離れるように形成されていればよい。このとき、端部に比べて中央部が突出するため、中央部に対応する記録材に対する剥離部位での加圧分布が増加することになり、押圧部材２の撓み等に伴う中央部での加圧不足が補足される。
尚、加圧部４は、別の見方をすれば、押圧部材２の長手方向において端部から中央部に向かうに従い、押圧部材２の加圧回転体１２側の面が加圧回転体１２側に張り出すように形成されていると捉えることも可能である。 In such technical means, as described later, the pressing member 2 may be separated into a supported member 2a and a peeling member 2b, or may be an integrated member.
Further, as the guide portion 3, it is possible to select as long as the bent corner portion of the belt-like rotator 11 bites into the pressurizing rotator 12. 12 may be provided in consideration of the relative positional relationship with respect to Twelve.
Further, the pressurizing unit 4 is formed such that the surface of the pressing member 2 on the side of the pressing rotator 12 is separated from the pressing rotator 12 as it goes from the center to the end in the longitudinal direction of the pressing member 2. It only has to be. At this time, since the central portion protrudes compared to the end portion, the pressurization distribution at the peeling portion with respect to the recording material corresponding to the central portion increases, and the pressurization at the central portion due to the bending of the pressing member 2 or the like increases. The lack of pressure is supplemented.
From another point of view, the pressure member 4 is such that the surface of the pressing member 2 on the pressure rotating body 12 side is closer to the pressure rotating body 12 as it goes from the end to the center in the longitudinal direction of the pressing member 2. It can also be understood that it is formed so as to overhang.

次に、剥離装置１の代表的態様や好ましい態様について説明する。
先ず、剥離装置１の好ましい態様としては、押圧部材２による押圧分布をより良好に保つという観点からすれば、更に、前記押圧部材２の加圧回転体１２側で、ベルト状回転体１１の移動方向と交差する交差方向に対し中央部が両端部よりも前記接触域側に向かって凸状に突出する突出部５を備える態様が挙げられる。
ここでいう突出部５は必ずしも湾曲状であることは要しない。山型状に突出したものでもよいし、中央部が突出するものであれば適宜選定して差し支えない。
また、押圧部材２の代表的態様としては、予め決められた支持部位に支持される被支持部材２ａとこの被支持部材２ａのベルト状回転体１１との接触面に沿って設けられる剥離部材２ｂとで構成されている態様が挙げられる。本態様では、例えば板状の剥離部材２ｂに案内部３や加圧部４を予め形成しておき、この剥離部材２ｂを被支持部材２ａに固着するようにすればよい。
更に、このような押圧部材２の支持構造としては適宜選定して差し支えないが、押圧部材２の配設位置が一義的に決まるという観点から、押圧部材２はベルト状回転体１１が保持可能な保持部材（図示せず）に対し支持部材（図示せず）を介して固定的に支持される態様が好ましい。
更にまた、ベルト状回転体との接触抵抗を低減させるという観点からすれば、押圧部材２のうちベルト状回転体１１との接触面は当該ベルト状回転体１１との間の摩擦力が低減可能な潤滑層を有することが好ましい。
また、案内部３としては、加圧回転体１２に食い込むものであればよいが、加圧回転体１２に対するベルト状回転体の食い込み状態を安定させるという観点からすれば、前記ベルト状回転体１１の屈曲形状角部は曲率の大きい曲面部を有しており、案内部３は前記ベルト状回転体の曲面部を前記加圧回転体１２に埋没させる程度に食い込ませる態様が好ましい。 Next, a typical aspect and a preferable aspect of the peeling apparatus 1 will be described.
First, as a preferable aspect of the peeling device 1, from the viewpoint of maintaining a better pressure distribution by the pressing member 2, the movement of the belt-shaped rotating body 11 is further performed on the pressure rotating body 12 side of the pressing member 2. The aspect provided with the protrusion part 5 which a center part protrudes more convexly toward the said contact area side than both ends with respect to the cross direction which cross | intersects a direction is mentioned.
The protrusion 5 here does not necessarily need to be curved. A protrusion protruding in a mountain shape may be used, and any protrusion may be selected as long as the center protrudes.
Moreover, as a typical aspect of the pressing member 2, the peeling member 2b provided along the contact surface between the supported member 2a supported by a predetermined supporting portion and the belt-like rotating body 11 of the supported member 2a. The aspect comprised by these is mentioned. In this embodiment, for example, the guide part 3 and the pressure part 4 may be formed in advance on the plate-like peeling member 2b, and the peeling member 2b may be fixed to the supported member 2a.
Further, the supporting structure of the pressing member 2 may be appropriately selected. However, the pressing member 2 can be held by the belt-shaped rotating body 11 from the viewpoint that the position of the pressing member 2 is uniquely determined. A mode in which the support member (not shown) is fixedly supported via a support member (not shown) is preferable.
Furthermore, from the viewpoint of reducing the contact resistance with the belt-shaped rotating body, the contact surface of the pressing member 2 with the belt-shaped rotating body 11 can reduce the frictional force with the belt-shaped rotating body 11. It is preferable to have a proper lubricating layer.
The guide 3 may be anything that bites into the pressure rotator 12, but from the viewpoint of stabilizing the biting state of the belt-like rotator with respect to the pressure rotator 12, the belt-like rotator 11 is used. It is preferable that the bent corner portion has a curved surface portion with a large curvature, and the guide portion 3 bites the curved surface portion of the belt-like rotating body into the pressure rotating body 12.

また、剥離装置１の他の態様としては、ベルト状回転体１１と前記ベルト状回転体１１に接触して配置される加圧回転体１２との間の接触域の前記ベルト状回転体１１の移動方向における下流側に設けられ、前記ベルト状回転体１１の内側にて前記ベルト状回転体１１を介して前記接触域を形成するように配置され且つ前記ベルト状回転体１１に貼り付く記録材を剥離するものであって、前記ベルト状回転体１１の移動方向に交差する幅方向に沿って長く延びるように設けられるとともに、前記ベルト状回転体１１が前記加圧回転体１２側に接触するように前記ベルト状回転体１１を押圧する押圧部材２と、前記押圧部材２の前記加圧回転体１２側に設けられ且つ前記ベルト状回転体１１に屈曲部を形成するとともに、前記屈曲部が前記加圧回転体１２に食い込むように前記ベルト状回転体１１を案内する案内部３と、前記押圧部材２の前記加圧回転体１２側で、前記ベルト状回転体１１の移動方向と交差する交差方向において中央部が両端部よりも前記接触域の前記ベルト状回転体１１の移動方向の上流側に向かって凸状に突出する突出部５と、を備えるものが挙げられる。 Further, as another aspect of the peeling device 1, the belt-shaped rotating body 11 in a contact area between the belt-shaped rotating body 11 and the pressure rotating body 12 disposed in contact with the belt-shaped rotating body 11 is used. A recording material provided on the downstream side in the moving direction, disposed so as to form the contact area via the belt-like rotator 11 inside the belt-like rotator 11, and sticks to the belt-like rotator 11 Is provided so as to extend long along the width direction intersecting the moving direction of the belt-shaped rotating body 11, and the belt-shaped rotating body 11 contacts the pressure rotating body 12 side. As described above, the pressing member 2 that presses the belt-shaped rotating body 11, the bending member is provided on the pressing rotating body 12 side of the pressing member 2, and a bent portion is formed in the belt-shaped rotating body 11. Pressurization In the crossing direction that intersects the moving direction of the belt-like rotator 11 on the side of the pressing rotator 12 of the pressing member 2 on the side of the pressure rotator 12 to guide the belt-like rotator 11 so as to bite into the rolling element 12. The center part is provided with the protrusion part 5 which protrudes in a convex shape toward the upstream side of the moving direction of the belt-shaped rotating body 11 in the contact area from both ends.

本態様は、剥離装置１の要素である押圧部材２の案内部３による加圧回転体１２への食い込みと、突出部５による中央部における接触面積の増加に伴って、ベルト状回転体１１と加圧回転体１２との間の接触域下流側の剥離部位での記録材に対する加圧分布の中央部の加圧不足を補足するものである。
ここで、突出部５の好ましい態様としては、記録材に発生する皺を押し広げるという観点からすれば、前記交差方向中央部を中心に対称的且つ湾曲状に形成されているものが挙げられる。
また、突出部５の先端とベルト状回転体１１との引っ掛かりを抑制するという観点からすれば、突出部５はその先端が断面曲面状に形成されていることが好ましい。 In this aspect, the belt-like rotator 11 and the belt-like rotator 11 are encroached on the pressing rotator 12 by the guide portion 3 of the pressing member 2 that is an element of the peeling device 1 and the contact area in the central portion is increased by the protrusion 5. This supplements the insufficient pressurization of the central portion of the pressurization distribution with respect to the recording material at the peeling portion downstream of the contact area with the pressurizing rotator 12.
Here, as a preferable aspect of the protruding portion 5, from the viewpoint of spreading the wrinkles generated in the recording material, one that is formed symmetrically and curved around the central portion in the intersecting direction can be cited.
Further, from the viewpoint of suppressing catching between the tip of the protruding portion 5 and the belt-like rotating body 11, it is preferable that the tip of the protruding portion 5 is formed in a curved cross-section.

◎実施の形態１
＜画像形成装置＞
図２は本発明が適用される画像形成装置の実施の形態１を示す説明図である。
同図において、画像形成装置２０は、所謂タンデム型と呼ばれる中間転写方式の画像形成装置であり、電子写真方式により各色成分（本例ではイエロ（Ｙ）、マゼンタ（Ｍ）、シアン（Ｃ）、ブラック（Ｋ）の四色）のトナー像が形成される複数の画像形成部２２（２２ａ〜２２ｄ）を有し、各画像形成部２２に対応した箇所にはベルト状の中間転写体２３を配設すると共に、各画像形成部２２に対応した中間転写体２３の背面には一次転写器２４（例えば一次転写ロール）を配設し、更に、中間転写体２３の一部には、各画像形成部２２から中間転写体２３に一次転写器２４にて一次転写された各色成分トナー像が記録材としての用紙Ｐに二次転写される二次転写器（例えば二次転写ロール）２５を配設し、各色成分トナー像が転写された用紙Ｐの搬送方向下流側には定着装置６０を配設し、用紙Ｐ上の未定着トナー像を定着させるものである。 Embodiment 1
<Image forming apparatus>
FIG. 2 is an explanatory diagram showing Embodiment 1 of the image forming apparatus to which the present invention is applied.
In FIG. 1, an image forming apparatus 20 is an intermediate transfer type image forming apparatus called a so-called tandem type, and each color component (in this example, yellow (Y), magenta (M), cyan (C), A plurality of image forming units 22 (22a to 22d) on which black (K) toner images are formed, and belt-like intermediate transfer members 23 are arranged at positions corresponding to the respective image forming units 22. In addition, a primary transfer unit 24 (for example, a primary transfer roll) is disposed on the back surface of the intermediate transfer member 23 corresponding to each image forming unit 22, and each image forming unit is formed on a part of the intermediate transfer member 23. A secondary transfer device (for example, a secondary transfer roll) 25 is provided for each color component toner image primarily transferred from the unit 22 to the intermediate transfer body 23 by the primary transfer device 24 to be secondarily transferred to the paper P as a recording material. Each color component toner image was transferred The downstream side of the paper P is disposed a fixing device 60 is intended to fix the unfixed toner image on the sheet P.

ここで、各画像形成部２２は、予め決められた方向に回転するドラム状の感光体３０を有し、この感光体３０の周囲には、感光体３０を帯電する帯電器３１，この帯電器３１にて帯電された感光体３０上に静電潜像を書き込むレーザ走査装置などの露光器３２と、この露光器３２にて感光体３０上に書き込まれた静電潜像を対応する色トナーにて現像する現像器３３と、この現像器３３にて現像されたトナー像が前記一次転写器２４にて中間転写体２３上に一次転写された後の感光体３０上の残留物を清掃する清掃器３４とを備えたものである。
また、中間転写体２３は、複数の張架ロール４１〜４５に掛け渡されており、例えば張架ロール４１を駆動ロールとして予め決められた方向に沿って循環回転するようになっている。また、張架ロール４４は二次転写器２５としての二次転写ロールの対向ロールを兼用し、二次転写ロールと対向ロールとの間に二次転写に必要な二次転写電界を生成するようになっている。更に、張架ロール４５に対応する中間転写体２３の表面には中間転写清掃器４６が配設されている。
更に、中間転写体２３の下方には用紙供給装置５０が設けられ、この用紙供給装置５０から供給された用紙Ｐは二次転写器２５を経て定着装置６０に至る搬送経路５１に沿って搬送されるようになっている。尚、搬送経路５１には、適宜数の搬送ロール５２や、二次転写器２５から定着装置６０へ搬送する搬送ベルト５３，更には、二次転写器２５による二次転写部位、定着装置６０の定着部位へ用紙Ｐを案内する案内板５４，５５や、図示外の用紙排出部に用紙Ｐを排出するための排出ロール５６等が設けられている。 Here, each image forming unit 22 includes a drum-shaped photoconductor 30 that rotates in a predetermined direction. Around the photoconductor 30, a charger 31 that charges the photoconductor 30, and this charger An exposure device 32 such as a laser scanning device for writing an electrostatic latent image on the photosensitive member 30 charged by 31 and a color toner corresponding to the electrostatic latent image written on the photosensitive member 30 by the exposure device 32 The developing unit 33 that develops the toner and the toner image developed by the developing unit 33 are cleaned of the residue on the photoreceptor 30 after the toner image developed by the primary transfer unit 24 is primarily transferred onto the intermediate transfer member 23. And a cleaning device 34.
The intermediate transfer member 23 is stretched around a plurality of stretching rolls 41 to 45. For example, the intermediate transfer body 23 circulates and rotates along a predetermined direction using the stretching roll 41 as a driving roll. Further, the stretching roll 44 also serves as an opposing roll of the secondary transfer roll as the secondary transfer device 25, and generates a secondary transfer electric field necessary for secondary transfer between the secondary transfer roll and the opposing roll. It has become. Further, an intermediate transfer cleaner 46 is disposed on the surface of the intermediate transfer member 23 corresponding to the stretching roll 45.
Further, a paper supply device 50 is provided below the intermediate transfer body 23, and the paper P supplied from the paper supply device 50 is conveyed along a conveyance path 51 that reaches the fixing device 60 through the secondary transfer device 25. It has become so. The transport path 51 includes an appropriate number of transport rolls 52, a transport belt 53 transported from the secondary transfer device 25 to the fixing device 60, a secondary transfer portion by the secondary transfer device 25, and the fixing device 60. Guide plates 54 and 55 for guiding the paper P to the fixing part, a discharge roll 56 for discharging the paper P to a paper discharge unit (not shown), and the like are provided.

＜定着装置＞
次に、本実施の形態で用いられる定着装置６０について図３を用いて説明する。
同図において、定着装置６０は、ハロゲンランプ等の熱源６１ａを内蔵した定着ロール６１と、この定着ロール６１及び複数の張架ロール６２〜６５に掛け渡されて加熱されながら循環移動する加熱ベルト６６と、この定着ロール６１との間で加熱ベルト６６を加圧搬送する加圧ロール６７と、加熱ベルト６６の内側で定着ロール６１と加圧ロール６７との間のニップ域の下流側に設けられ、前記ニップ域を通過した用紙Ｐを剥離する剥離装置７０とを備えている。
ここで、本例では、張架ロール６２，６４及び６５は加熱ベルト６６の内側に配置され、張架ロール６３は張架ロール６２，６４の間の加熱ベルト６６の外側に配置されている。尚、本例では、定着ロール６１は熱源を有する構成になっているが、これに加えて、あるいは、これとは別に、張架ロール６２〜６５の一部については、必要に応じて例えば熱源を有する補助加熱ロールを兼用してもよい。
そして、本例では、定着ロール６１は、例えばアルミニウムからなる円筒状の芯金の表面に例えばフッ素樹脂などの保護層を被覆したものである。また、加圧ロール６７は例えばアルミニウム製の芯金を基体とし、この基体上にシリコーンゴム等の弾性層、更にはＰＦＡチューブなどの離型層を積層したものである。更に、加熱ベルト６６としては適宜選定して差し支えないが、例えばポリイミド樹脂等の基層を有し、この基層の表面側にシリコーンゴム等の弾性層、更にはＰＦＡチューブからなる離型層を積層したものである。尚、各張架ロール６２〜６５は例えばアルミニウム製の金属ロールである。 <Fixing device>
Next, the fixing device 60 used in the present embodiment will be described with reference to FIG.
In the figure, a fixing device 60 includes a fixing roll 61 having a built-in heat source 61a such as a halogen lamp, and a heating belt 66 that circulates and moves over the fixing roll 61 and a plurality of stretching rolls 62 to 65 while being heated. And a pressure roll 67 that conveys and heats the heating belt 66 between the fixing roll 61 and a downstream side of the nip region between the fixing roll 61 and the pressure roll 67 inside the heating belt 66. And a peeling device 70 for peeling the paper P that has passed through the nip area.
Here, in this example, the stretching rolls 62, 64 and 65 are disposed inside the heating belt 66, and the stretching roll 63 is disposed outside the heating belt 66 between the stretching rolls 62 and 64. In this example, the fixing roll 61 is configured to have a heat source. In addition to this, or alternatively, a part of the stretching rolls 62 to 65 is, for example, a heat source as necessary. You may also use the auxiliary heating roll which has.
In this example, the fixing roll 61 is obtained by coating a surface of a cylindrical metal core made of aluminum, for example, with a protective layer such as a fluororesin. Further, the pressure roll 67 is formed by using, for example, an aluminum cored bar as a base, and an elastic layer such as silicone rubber and a release layer such as a PFA tube are laminated on the base. Further, the heating belt 66 may be appropriately selected. For example, the heating belt 66 has a base layer such as polyimide resin, and an elastic layer such as silicone rubber and a release layer made of a PFA tube are laminated on the surface side of the base layer. Is. Each of the tension rolls 62 to 65 is, for example, an aluminum metal roll.

＜剥離装置＞
―押圧パッド―
本実施の形態において、剥離装置７０は、加熱ベルト６６の移動方向に交差する幅方向に沿って長く延びるように設けられ、加熱ベルト６６が加圧ロール６７側に接触配置された後に加圧ロール６７表面から方向変更する形状になるように加熱ベルト６６を押圧する押圧パッド（押圧部材に相当）７１を備えている。
本例では、押圧パッド７１は、図４及び図５（ａ）（ｂ）に示すように、例えば炭素鋼鋼材等の金属やセラミックス等の剛体にて形成され且つ予め決められた支持部位に支持される被支持部材７２と、この被支持部材７２の加熱ベルト６６との接触面に沿って設けられ且つ例えばＳＵＳ等の金属やセラミックスの剛体にて断面略Ｌ字状に形成された剥離部材７３とを有し、剥離部材７３の縦方向に延びる縦壁部７３ａに開設された複数の取付孔７４を介して図示外の止め具にて被支持部材７２に対し剥離部材７３を固着するものである。
―案内部―
そして、本例では、押圧パッド７１の一要素である剥離部材７３は断面Ｌ字状の屈曲部位に曲面状角部７３ｃを有しており、前記押圧パッド７１は前記剥離部材７３の横方向に延びる横壁部７３ｂ及び曲面状角部７３ｃを案内部７５として加圧ロール６７に対し加熱ベルト６６を食い込ませるように加熱ベルト６６を案内するようになっている。
本例では、案内部７５は剥離部材７３の曲面状角部７３ｃに対応して屈曲配置される加熱ベルト６６の屈曲部を加圧ロール６７に埋没させる程度に食い込ませるようになっている。
このため、本例では、加熱ベルト６６は、例えば図４に示すように、定着ロール６１と加圧ロール６７との間のニップ域Ｎ_１及び押圧パッド７１と加圧ロール６７との間のニップ域Ｎ_２にて加圧ロール６７に接触配置されることになり、加熱ベルト６６は定着ニップ域Ｎ（具体的にはニップ域Ｎ_１＋ニップ域Ｎ_２）に亘って加圧ロール６７との間で用紙Ｐを加熱加圧搬送した後、前記ニップ域Ｎ_２の出口側に位置する押圧パッド７１の剥離部材７３の曲面状角部７３ｃの形状に沿って加圧ロール６７から離間していくものである。このため、用紙Ｐは加熱ベルト６６と加圧ロール６７との間の定着ニップ域Ｎを通過した後に前記押圧パッド７１の剥離部材７３の曲面状角部７３ｃに対応した部位にて剥離し易い構成になっている。 <Peeling device>
―Press pad―
In the present embodiment, the peeling device 70 is provided so as to extend long along the width direction intersecting the moving direction of the heating belt 66, and after the heating belt 66 is disposed in contact with the pressure roll 67, the pressure roll 67 A pressing pad (corresponding to a pressing member) 71 for pressing the heating belt 66 is provided so as to change the direction from the surface.
In this example, as shown in FIGS. 4 and 5A and 5B, the pressing pad 71 is formed of a rigid body such as a metal such as carbon steel or a ceramic, and is supported on a predetermined supporting portion. The peeling member 73 provided along the contact surface between the supported member 72 to be supported and the heating belt 66 of the supported member 72 and formed in a substantially L-shaped cross section with a rigid body of metal such as SUS or ceramics. The separation member 73 is fixed to the supported member 72 by a stopper (not shown) via a plurality of mounting holes 74 provided in the vertical wall portion 73a extending in the longitudinal direction of the separation member 73. is there.
―Guidance Department―
In this example, the peeling member 73 that is one element of the pressing pad 71 has a curved corner 73 c at a bent portion having an L-shaped cross section, and the pressing pad 71 extends in the lateral direction of the peeling member 73. The heating belt 66 is guided so as to bite the heating belt 66 into the pressure roll 67 using the extending lateral wall portion 73b and the curved corner portion 73c as a guide portion 75.
In this example, the guide portion 75 is configured to bite the bent portion of the heating belt 66 that is bent and disposed corresponding to the curved corner portion 73 c of the peeling member 73 so as to be buried in the pressure roll 67.
Therefore, in this example, as shown in FIG. 4, for example, the heating belt 66 includes a nip region N ₁ between the fixing roll 61 and the pressure roll 67 and a nip between the pressure pad 71 and the pressure roll 67. The heating belt 66 is placed in contact with the pressure roll 67 in the area N ₂ , and the heating belt 66 is in contact with the pressure roll 67 over the fixing nip area N (specifically, the nip area N ₁ + the nip area N ₂ ). after heating under pressure conveying the paper P between, going away from the pressure roll 67 along the shape of the curved corner portion 73c of the separation member 73 of the pressure pad 71 located on the outlet side of the nip area N ₂ Is. For this reason, the sheet P is likely to be peeled off at a portion corresponding to the curved corner 73 c of the peeling member 73 of the pressing pad 71 after passing through the fixing nip region N between the heating belt 66 and the pressure roll 67. It has become.

―加圧部―
また、本実施の形態において、押圧パッド７１の一要素である剥離部材７３は、図６（ａ）〜（ｄ）に示すように、横壁部７３ｂの面が押圧パッドの長手方向に対し中央部から端部に向かうに従い加圧ロール６７から離れるように形成され、加圧ロール６７に対して加熱ベルト６６を加圧する加圧部７６として構成されている。この加圧部７６の加圧ロール６７側への突出量ｈ（図６（ｄ）参照）は、押圧パッド７１によるニップ域Ｎ_２での加圧分布のうち用紙Ｐの幅方向中央部の加圧不足分を考慮して適宜設定されるようになっている。
―突出部―
更に、本実施の形態において、押圧パッド７１の一要素である剥離部材７３は、更に、横壁部７３ｂの先端側、つまり定着ロール６１と加圧ロール６７とのニップ域Ｎ_１側に突出部７７を有し、この突出部７７は用紙Ｐの搬送方向（プロセス方向に相当）に交差する幅方向に対し中央部が両端部よりもニップ域Ｎ_１側に向かって凸状に突出形成されている。
特に、本例では、突出部７７の先端縁は、用紙Ｐの幅方向中央部を中心に対称的且つ湾曲状の湾曲縁７８として形成されている。
更に、突出部７７は、その先端が断面曲面状の曲面端７９（図１３（ｂ）参照）として形成されている。
このように、本実施の形態では、押圧パッド７１の一要素である剥離部材７３は、図６（ｅ）に示す比較の形態の剥離部材７３’（略矩形状の平板を断面略Ｌ字に屈曲形成した態様）比べて、案内部７５、加圧部７６及び突出部７７を有している点に特徴がある。 ―Pressurizing part―
Further, in the present embodiment, as shown in FIGS. 6A to 6D, the peeling member 73 that is one element of the pressing pad 71 is such that the surface of the lateral wall portion 73b is in the center with respect to the longitudinal direction of the pressing pad. It forms so that it may leave | separate from the pressurization roll 67 as it goes to an edge part, and it is comprised as the pressurization part 76 which pressurizes the heating belt 66 with respect to the pressurization roll 67. FIG. The protrusion amount h (see FIG. 6D) of the pressure unit 76 toward the pressure roll 67 side is the addition of the central portion in the width direction of the paper P in the pressure distribution in the nip region N ₂ by the pressure pad 71. It is set appropriately considering the pressure deficiency.
―Protruding portion―
Further, in the present embodiment, the peeling member 73 that is an element of the pressing pad 71 further protrudes on the leading end side of the lateral wall portion 73 b, that is, on the nip region N ₁ side between the fixing roll 61 and the pressure roll 67. The projecting portion 77 is formed so that the center portion projects in a convex shape toward the nip region N ₁ side from both ends with respect to the width direction intersecting with the conveyance direction (corresponding to the process direction) of the paper P. .
In particular, in this example, the leading edge of the protruding portion 77 is formed as a curved edge 78 that is symmetrical and curved around the central portion in the width direction of the paper P.
Further, the protruding portion 77 is formed as a curved end 79 (see FIG. 13B) having a curved section at the tip.
As described above, in this embodiment, the peeling member 73 that is one element of the pressing pad 71 is a peeling member 73 ′ (a substantially rectangular flat plate having a substantially L-shaped cross section) in the comparative form shown in FIG. Compared with the bent form), it has a feature in that it has a guide portion 75, a pressurizing portion 76, and a protruding portion 77.

―剥離装置の取付構造―
本実施の形態において、剥離装置７０の取付構造は、図７（ａ）に示すように、図示外の画像形成装置筐体に定着ロール６１が保持される定着ホルダ６８を固定し、この定着ホルダ６８に対し押圧パッド７１の一要素である被支持部材７２を支持部材８０にて固定するようにしたものである。
尚、剥離装置７０の取付構造についてはこれに限定されるものではなく、例えば図７（ｂ）に示すように、定着ロール６１の軸に対して支持部材８１を揺動自在に支持し、この支持部材８１に対し押圧パッド７１の一要素である被支持部材７２を固定すると共に、前記被支持部材７２を付勢バネ８２にて支持部材８１の揺動方向に抗する方向に付勢するようにしてもよい。
このような剥離装置７０の取付構造については、図７（ａ）に示す方式は、図７（ｂ）に示す方式に比べて、剥離装置７０の押圧パッド７１の加圧ロール６７に対する相対域関係が一義的に定まる点で好ましい。 ―Peeling device mounting structure―
In the present embodiment, as shown in FIG. 7A, the attachment structure of the peeling device 70 is such that a fixing holder 68 that holds the fixing roll 61 is fixed to an image forming apparatus housing (not shown). 68, a supported member 72, which is one element of the pressing pad 71, is fixed by a supporting member 80.
Note that the mounting structure of the peeling device 70 is not limited to this. For example, as shown in FIG. 7B, a support member 81 is swingably supported with respect to the shaft of the fixing roll 61. A supported member 72, which is one element of the pressing pad 71, is fixed to the support member 81, and the supported member 72 is biased by a biasing spring 82 in a direction against the swinging direction of the support member 81. It may be.
Regarding the mounting structure of such a peeling device 70, the method shown in FIG. 7A is relative to the pressure roll 67 of the pressing pad 71 of the peeling device 70 as compared to the method shown in FIG. 7B. Is preferable in that it is uniquely determined.

＜剥離補助装置＞
また、本実施の形態では、定着装置６０は加熱ベルト６６の内側に剥離装置７０を有しているが、定着装置６０の加熱ベルト６６と加圧ロール６７との間の定着ニップ域Ｎの下流側には剥離補助部材９０が設けられている。
この剥離補助部材９０は、加熱ベルト６６の回転方向に先端部が対向するように非接触配置され且つ加熱ベルト６６に貼り付く用紙Ｐを剥離するものであり、例えば板状のバッフル板が用いられる。
この剥離補助部材９０は、その先端を加熱ベルト６６に可能な限り近接させて設けることが好ましい。加熱ベルト６６との間の設置距離については、少なくとも１．０ｍｍ以下、好ましくは０．３ｍｍ以下にすることがよい。
しかしながら、剥離補助部材９０の設置距離を加熱ベルト６６に近接しすぎると、剥離補助部材９０が加熱ベルト６６からの輻射熱によって熱膨張する懸念があり、加熱ベルト６６を損傷したり、あるいは、波打ちを生じさせて画像不良を招来させる懸念もある。このため、本例では、剥離補助部材９０については、熱膨張の少ない素材（例えばインバー）を用いることが好ましい。 <Peeling assist device>
In this embodiment, the fixing device 60 includes the peeling device 70 inside the heating belt 66, but is downstream of the fixing nip region N between the heating belt 66 and the pressure roll 67 of the fixing device 60. A peeling assisting member 90 is provided on the side.
The peeling assisting member 90 peels off the paper P that is arranged in a non-contact manner so that the front end faces the rotation direction of the heating belt 66 and sticks to the heating belt 66. For example, a plate-like baffle plate is used. .
The peeling assisting member 90 is preferably provided with its tip as close as possible to the heating belt 66. The installation distance from the heating belt 66 is at least 1.0 mm or less, preferably 0.3 mm or less.
However, if the installation distance of the peeling auxiliary member 90 is too close to the heating belt 66, there is a concern that the peeling auxiliary member 90 may thermally expand due to radiant heat from the heating belt 66, and the heating belt 66 may be damaged or corrugated. There is also a concern that it may cause image defects. For this reason, in this example, it is preferable to use a material (for example, Invar) having a small thermal expansion for the peeling assisting member 90.

＜画像形成装置の作動＞
次に、本実施の形態に係る画像形成装置の作動について説明する。
図２に示す画像形成装置において、各色成分の画像形成部２２（２２ａ〜２２ｄ）にて感光体３０上に各色成分トナー像を形成し、中間転写体２３上に各色トナー像を順次一次転写した後、用紙供給装置５０から供給された用紙Ｐに対し中間転写体２３上の各色トナー像を一括転写し、一括転写された各色トナー像が保持された用紙Ｐを定着装置６０に搬入し、定着装置６０にて用紙Ｐ上に各色トナー像を定着させた後、定着装置６０から定着済み用紙Ｐを排出する。
このような作像過程において、定着装置６０の剥離装置７０の動作過程について説明する。 <Operation of image forming apparatus>
Next, the operation of the image forming apparatus according to the present embodiment will be described.
In the image forming apparatus shown in FIG. 2, each color component toner image is formed on the photoreceptor 30 by the image forming unit 22 (22 a to 22 d) for each color component, and each color toner image is sequentially primary transferred onto the intermediate transfer body 23. Thereafter, the color toner images on the intermediate transfer body 23 are collectively transferred to the paper P supplied from the paper supply device 50, and the paper P holding the color toner images transferred in batch is carried into the fixing device 60 and fixed. After fixing each color toner image on the paper P by the device 60, the fixed paper P is discharged from the fixing device 60.
An operation process of the peeling device 70 of the fixing device 60 in such an image forming process will be described.

＜剥離装置の動作過程＞
―案内部による圧力分布―
本実施の形態において、剥離装置７０は、図８（ａ）に示すように、押圧パッド７１の案内部７５にて加熱ベルト６６を加圧ロール６７側に食い込ませるように当該加熱ベルト６６を案内する。
特に、本例では、押圧パッド７１の案内部７５は、剥離部材７３の曲面状角部７３ｃに対応して屈曲配置される加熱ベルト６６の屈曲部６６ａを加圧ロール６７に埋没させる程度に食い込ませるようになっているため、押圧パッド７１による加熱ベルト６６と加圧ロール６７との間の加圧分布（図４に示すニップ域Ｎ_２における加圧分布に相当）は、図８（ｂ）に示すように、用紙Ｐの移動方向に相当するプロセス方向位置に対し剥離部材７３の横壁部７３ｂから曲面状角部７３ｃに至るまでの間略均等に圧力が作用した状態になる。
尚、図８（ｂ）に示す加圧分布は、図４の定着ニップ域Ｎにおける圧力分布を示し、左側領域がニップ域Ｎ_１に対応し、右側領域がニップ域Ｎ_２に対応するものである。 <Operation process of peeling device>
-Pressure distribution by the guide-
In the present embodiment, the peeling device 70 guides the heating belt 66 so that the heating belt 66 bites into the pressure roll 67 side by the guide portion 75 of the pressing pad 71 as shown in FIG. To do.
In particular, in this example, the guide portion 75 of the pressing pad 71 bites into the pressure roll 67 such that the bent portion 66a of the heating belt 66 that is bent and arranged corresponding to the curved corner portion 73c of the peeling member 73 is buried in the pressure roll 67. since that is way to, pressure distribution between the heating belt 66 and the pressure roller 67 by the pressure pad 71 (corresponding to the pressurizing pressure distribution in the nip zone N ₂ shown in FIG. 4) is, and FIG. 8 (b) As shown in FIG. 5, the pressure is applied substantially uniformly from the lateral wall portion 73b of the peeling member 73 to the curved corner portion 73c with respect to the process direction position corresponding to the moving direction of the paper P.
Incidentally, pressurizing pressure distribution shown in FIG. 8 (b) shows the pressure distribution at the fixing nip region N of Fig. 4, in which the left area corresponds to the nip area N _1, right area corresponds to the nip area N ₂ is there.

この点、仮に、図９（ａ）に示す比較の形態のように、剥離装置７０’の一要素である押圧パッド７１’が加圧ロール６７に対し加熱ベルト６６を食い込まない状態で押圧している態様にあっては、図９（ｂ）に示すように、押圧パッド７１’と加圧ロール６７との間で加熱ベルト６６が加圧ロール６７に加圧されない無加圧領域Ｊが生成されてしまう懸念がある。
このとき、加熱ベルト６６が加圧ロール６７に加圧されている状態では、図９（ｃ）に示すように、用紙Ｐ上のトナー層Ｔは加熱ベルト６６に加圧されることから、トナー層Ｔ中の気泡Ｋが膨張しようとしても、押圧力Ｕ＞気泡Ｋ中の水蒸気圧の関係を満たし、トナー層Ｔ中の気泡Ｋはそのままの状態を保つ。
これに対し、上述したように、無加圧領域Ｊが存在すると、図９（ｃ）に示すように、トナー層Ｔ中の気泡が膨張し、押圧力Ｕ＜気泡Ｋ中の水蒸気圧の関係になると、膨張した気泡Ｋがトナー層Ｔを破壊し、トナー層Ｔ表面を乱すという現象につながる懸念がある。
従って、本実施の形態によれば、上述した無加圧領域Ｊが存在しなくなることから、膨張した気泡がトナー層Ｔを破壊するという現象は抑制される。 In this regard, as in the comparative example shown in FIG. 9A, the pressing pad 71 ′, which is one element of the peeling device 70 ′, presses the heating belt 66 against the pressure roll 67 without biting it. In the present embodiment, as shown in FIG. 9B, a non-pressurized region J where the heating belt 66 is not pressed against the pressure roll 67 between the pressure pad 71 ′ and the pressure roll 67 is generated. There is a concern.
At this time, in a state where the heating belt 66 is pressed by the pressure roll 67, the toner layer T on the paper P is pressed by the heating belt 66 as shown in FIG. Even if the bubbles K in the layer T try to expand, the relationship of the pressing force U> the water vapor pressure in the bubbles K is satisfied, and the bubbles K in the toner layer T are kept as they are.
On the other hand, as described above, when the non-pressurized region J exists, the bubbles in the toner layer T expand as shown in FIG. 9C, and the relationship of the pressing force U <the water vapor pressure in the bubbles K is satisfied. Then, there is a concern that the expanded bubble K destroys the toner layer T and disturbs the surface of the toner layer T.
Therefore, according to the present embodiment, since the above-described non-pressurized region J does not exist, the phenomenon that the expanded bubbles destroy the toner layer T is suppressed.

―加圧部による圧力分布―
図１０（ａ）は、本実施の形態で用いられる定着装置６０を上方から見た模式図である。
このとき、仮に、剥離装置７０の押圧パッド７１に加圧部７６を設けない態様（加圧部が平面状である態様に相当）では、図１０（ｂ）に示すように、定着ニップ域Ｎでの圧力分布は、図４に示すニップ域Ｎ_１（図中Ｐ／ＲＮｉｐに相当）では十分に強い圧力が得られるが、図４に示すニップ域Ｎ_２（図中ＰａｄＮｉｐに相当）ではプロセス方向に交差する用紙幅方向の中央部が両端部に比べて弱い傾向が見られる。
このような状況において、本実施の形態では、押圧パッド７１の加圧部７６は、用紙幅方向に対し中央部から端部に向かうに従い加圧ロール６７から離れる面を有しているため、定着ニップ域Ｎでの圧力分布のうち、押圧パッド７１に対応するニップ域Ｎ_２（図中ＰａｄＮｉｐに相当）では、中央部の加圧不足分が補足されることになり、ニップ域Ｎ_２の用紙幅方向中央部の圧力も両端部の圧力と略均一になり、用紙Ｐのトナー層Ｔは定着ニップ域Ｎのうちニップ域Ｎ_２においても略均一な加圧分布をもって加熱定着される。このため、用紙Ｐのトナー層Ｔに対する定着性は用紙幅方向に対して略均一な状態に保たれる。 ―Pressure distribution by pressurizing part―
FIG. 10A is a schematic view of the fixing device 60 used in the present embodiment as viewed from above.
At this time, if the pressing portion 71 is not provided on the pressing pad 71 of the peeling device 70 (corresponding to a mode in which the pressing portion is planar), as shown in FIG. As for the pressure distribution in FIG. 4, a sufficiently strong pressure is obtained in the nip area N ₁ (corresponding to P / R Nip in the figure) shown in FIG. 4, but the nip area N ₂ (corresponding to Pad Nip in the figure) shown in FIG. In this case, the central portion in the paper width direction intersecting the process direction tends to be weaker than both ends.
In such a situation, in the present embodiment, the pressing portion 76 of the pressing pad 71 has a surface that moves away from the pressing roll 67 as it goes from the center portion to the end portion in the paper width direction. of the pressure distribution in the nip region N, the nip region N ₂ corresponding to the pressure pad 71 _{(corresponding} to figure pad nip), will be pressurized shortage amount of the central portion is supplemented, the nip region N ₂ the pressure in the sheet width direction central portion also becomes the pressure of the end portions substantially uniform toner layer T of the paper P is heated and fixed with a substantially uniform pressure distribution even in the nip area N ₂ of the fixing nip area N. For this reason, the fixability of the paper P to the toner layer T is kept substantially uniform in the paper width direction.

―突出部による圧力分布―
本実施の形態では、押圧パッド７１は、用紙幅方向に対し中央部が両端部よりもニップ域Ｎ_１側に向かって凸状に突出形成されている突出部７７を有しているため、この突出部７７の分だけ押圧パッド７１の幅方向中央部の加圧面積が増加することになる。このため、押圧パッド７１による加圧分布は、図１１（ａ）に示すように、突出部７７に対応した部分で増加する傾向を示す。
特に、本例では、押圧パッド７１による加圧分布は、図１１（ａ）に示すように、突出部７７に対応した部位で気泡の水蒸気圧よりも高い押圧力（ニップ圧）を有していることから、突出部７７に対応した箇所で気泡の膨張によるトナー層の破壊は生じ難い。
この点、押圧パッド７１に突出部７７を設けない態様では、押圧パッド７１の突出部７７に対応した部分に押圧力が働かないことから、図１１（ｂ）に示すように、押圧パッド７１と定着ロール６１との間に加圧ロール６７側にほとんど加圧されない無加圧領域（押圧力＜気泡の水蒸気圧）が形成される懸念がある。 -Pressure distribution due to protrusion-
In this embodiment, the pressure pad 71, since the relative sheet width direction and has a protruding portion 77 which center portion is protruded in a convex shape toward the nip region N ₁ side from both end portions, the The pressing area at the center portion in the width direction of the pressing pad 71 is increased by the amount of the protruding portion 77. For this reason, the pressurization distribution by the press pad 71 shows the tendency which increases in the part corresponding to the protrusion part 77, as shown to Fig.11 (a).
In particular, in this example, the pressure distribution by the pressing pad 71 has a pressing force (nip pressure) higher than the water vapor pressure of bubbles at a portion corresponding to the protruding portion 77 as shown in FIG. Therefore, the toner layer is unlikely to break due to the expansion of the bubbles at the location corresponding to the protruding portion 77.
In this respect, in the aspect in which the protrusions 77 are not provided on the pressing pad 71, no pressing force is applied to the portion corresponding to the protrusion 77 of the pressing pad 71. Therefore, as shown in FIG. There is a concern that a non-pressurized region (pressing force <bubble water vapor pressure) that is hardly pressurized on the pressure roll 67 side is formed between the fixing roll 61 and the fixing roll 61.

―突出部による用紙の皺抑制―
用紙Ｐが定着装置６０の定着ニップ域Ｎ（図４参照）を通過する際には、図１２（ａ）に示すように、用紙Ｐに皺Ｚが発生し易い。
本実施の形態では、押圧パッド７１の突出部７７の先端縁は、用紙Ｐの幅方向中央部を中心に対称的且つ湾曲状の湾曲縁７８として形成されているため、図１２（ｂ）に示すように、突出部７７の湾曲縁７８には当該湾曲縁７８の法線方向に向かって用紙Ｐを押し広げる力Ｆｂが作用することになり、用紙Ｐの皺Ｚが押し広げられて発生しにくくなる。
特に、突出部７７の湾曲縁７８の曲率（１／Ｒ）を大きく設定すれば、この湾曲縁７８の法線方向に向かう力Ｆｃは、図１２（ｃ）に示すように、曲率の小さい場合に比べて、用紙Ｐを押し広げる作用がより強化されることになる。 -Suppression of paper wrinkles due to protrusions-
When the paper P passes through the fixing nip area N (see FIG. 4) of the fixing device 60, wrinkles Z are likely to occur on the paper P as shown in FIG.
In the present embodiment, the leading edge of the protrusion 77 of the pressing pad 71 is formed as a curved edge 78 that is symmetrical and curved around the center in the width direction of the paper P. As shown, a force Fb that pushes the paper P toward the normal direction of the curved edge 78 acts on the curved edge 78 of the protruding portion 77, and the ridge Z of the paper P is spread and generated. It becomes difficult.
In particular, if the curvature (1 / R) of the curved edge 78 of the protrusion 77 is set large, the force Fc in the normal direction of the curved edge 78 has a small curvature as shown in FIG. As compared with the above, the action of pushing the paper P is further strengthened.

―突出部の先端形状―
本実施の形態では、突出部７７は、図１３（ａ）（ｂ）に示すように、その先端が断面曲面状の曲面端７９として形成されている。このため、加熱ベルト６６が定着ロール６１から剥離装置７０の押圧パッド７１に沿って移動するときに、加熱ベルト６６が定着ロール６１と押圧パッド７１の突出部７７の曲面端７９との間に入り込もうとしても、前記突出部７７の曲面端７９に沿って押圧パッド７１の押圧面側に導かれることから、加熱ベルト６６が押圧パッド７１の突出部７７の先端で引っ掛かる懸念はない。
この点、図１３（ｃ）に示すように、押圧パッド７１の突出部７７の先端形状を断面平面状の平面端７９’にした態様では、加熱ベルト６６が定着ロール６１と突出部７７の平面端７９’との隙間に引っ掛かり易い懸念がある。 -Tip shape of protrusion-
In the present embodiment, as shown in FIGS. 13A and 13B, the projecting portion 77 has a tip formed as a curved end 79 having a curved cross section. Therefore, when the heating belt 66 moves from the fixing roll 61 along the pressing pad 71 of the peeling device 70, the heating belt 66 also enters between the fixing roll 61 and the curved end 79 of the protruding portion 77 of the pressing pad 71. Even so, there is no concern that the heating belt 66 will be caught at the tip of the protrusion 77 of the press pad 71 because it is guided along the curved end 79 of the protrusion 77 to the pressing surface of the press pad 71.
In this regard, as shown in FIG. 13C, in the aspect in which the tip end shape of the protruding portion 77 of the pressing pad 71 is a flat end 79 ′ having a planar cross section, the heating belt 66 is a flat surface of the fixing roll 61 and the protruding portion 77. There is a concern of being easily caught in the gap with the end 79 '.

―押圧パッドと加熱ベルトとの接触面構成―
本実施の形態では、剥離装置７０の押圧パッド７１は加圧ロール６７に対して加熱ベルト６６を押圧するものであるため、押圧パッド７１による押圧力をある程度大きくする必要がある場合には、押圧パッド７１と加熱ベルト６６との間の摩擦抵抗が大きくなる傾向がある。
このような状況において、押圧パッド７１と加熱ベルト６６との間の摩擦抵抗が不必要に大きくなってしまうと、加熱ベルト６６の移動速度が不安定になり、これに伴って、図１４（ａ）に仮想線で示すように、用紙Ｐが定着ニップ域Ｎに進入するときにループＰａが生ずるなど、用紙Ｐの搬送性が損なわれる懸念がある。
このような場合には、図１４（ｂ）に示すように、押圧パッド７１の一要素である剥離部材７３の加熱ベルト６６との接触面にガラス繊維等の潤滑層１００を形成し、押圧パッド７１と加熱ベルト６６との間の摩擦抵抗を低減させるようにすることが好ましい。 -Contact surface configuration between the pressure pad and heating belt-
In the present embodiment, since the pressing pad 71 of the peeling device 70 presses the heating belt 66 against the pressure roll 67, the pressing force by the pressing pad 71 needs to be increased to some extent. The frictional resistance between the pad 71 and the heating belt 66 tends to increase.
In such a situation, if the frictional resistance between the pressing pad 71 and the heating belt 66 becomes unnecessarily large, the moving speed of the heating belt 66 becomes unstable, and accordingly, FIG. ), There is a concern that the transportability of the paper P is impaired, for example, a loop Pa occurs when the paper P enters the fixing nip area N.
In such a case, as shown in FIG. 14B, a lubricating layer 100 of glass fiber or the like is formed on the contact surface of the peeling member 73, which is an element of the pressing pad 71, with the heating belt 66, and the pressing pad 71 It is preferable to reduce the frictional resistance between 71 and the heating belt 66.

◎実施の形態２
図１５は実施の形態２で用いられる剥離装置の要部を示す。
同図において、剥離装置７０の基本的構成は、実施の形態１と略同様であるが、押圧パッド７１の一要素である剥離部材７３が実施の形態１と異なっている。
本実施の形態において、押圧パッド７１の一要素である剥離部材７３は、実施の形態１と同様に、案内部７５及び突出部７７を有するもので、実施の形態１の加圧部７６を有していない構成（加圧部が平面状である態様）である。
本実施の形態によれば、押圧パッド７１は案内部７５及び突出部７７を有することから、押圧パッド７１による加圧分布は、用紙幅方向の中央部の加圧不足が補足され、用紙幅方向の中央部の圧力が両端部の圧力に接近するように調整される。
また、本例においても、押圧パッド７１の突出部７７は用紙Ｐ通過時に用紙Ｐを押し広げる作用を奏することから、用紙Ｐの皺の発生を抑制するものである。 Embodiment 2
FIG. 15 shows a main part of the peeling apparatus used in the second embodiment.
In the drawing, the basic configuration of the peeling device 70 is substantially the same as that of the first embodiment, but the peeling member 73 that is one element of the pressing pad 71 is different from that of the first embodiment.
In the present embodiment, the peeling member 73 that is one element of the pressing pad 71 has the guide portion 75 and the protruding portion 77 as in the first embodiment, and has the pressurizing portion 76 of the first embodiment. It is the structure which is not carried out (the aspect whose pressurization part is planar).
According to the present embodiment, since the pressing pad 71 has the guide portion 75 and the protruding portion 77, the pressure distribution by the pressing pad 71 is supplemented by insufficient pressurization at the center in the paper width direction, and the paper width direction. Is adjusted so that the pressure at the center of each approaches the pressure at both ends.
Also in this example, the protruding portion 77 of the pressing pad 71 functions to push and spread the paper P when passing through the paper P, thereby suppressing wrinkles of the paper P.

◎参考の形態
本実施の形態では、剥離装置７０の押圧パッド７１はいずれも案内部７５を有しており、この案内部７５にて加圧ロール６７に対し加熱ベルト６６を食い込ませるように案内するものであるが、例えば押圧パッド７１に案内部７５を設けない態様において、実施の形態１，２と同様な突出部７７を付加するようにしても、この押圧パッド７１の突出部７７は用紙Ｐ通過時に用紙Ｐを押し広げる作用を奏することから、用紙Ｐの皺の発生を抑制することは可能である。 Reference Form In this embodiment, each of the pressing pads 71 of the peeling device 70 has a guide part 75, and the guide part 75 guides the heating belt 66 to bite into the pressure roll 67. However, for example, in a mode in which the guide portion 75 is not provided on the pressing pad 71, the protruding portion 77 of the pressing pad 71 may be a sheet even if the same protruding portion 77 as in the first and second embodiments is added. Since the sheet P has an action of spreading the sheet P when passing through the sheet P, it is possible to suppress wrinkles of the sheet P.

実施例は、実施の形態１に係る定着装置（剥離装置７０を使用）を用い、定着ニップ域Ｎ（図４参照）でのプロセス方向位置と圧力との関係を調べたものである。
一方、比較例は実施の形態１に係る定着装置において、剥離装置の押圧パッドとして案内部、加圧部、突出部が設けられない態様を用い、定着ニップ域Ｎ（図４参照）でのプロセス方向位置と圧力との関係を調べたものである。
実施例における定着ニップ域Ｎでの加圧分布は、図１６（ａ）に示すように、押圧パッドに対応したニップ域Ｎ_２（図４参照）で略均一な圧力を示すことが理解される。
これに対し、比較例における定着ニップ域Ｎでの加圧分布は、図１６（ｂ）に示すように、押圧パッドに対応したニップ域Ｎ_２（図４参照）で無加圧領域が存在し、かつ、圧力の不足箇所があることが理解される。 In the example, the relationship between the process direction position and the pressure in the fixing nip region N (see FIG. 4) was examined using the fixing device (using the peeling device 70) according to the first embodiment.
On the other hand, in the comparative example, the fixing device according to the first embodiment uses a mode in which a guide portion, a pressure portion, and a protruding portion are not provided as a pressing pad of the peeling device, and a process in the fixing nip region N (see FIG. 4). The relationship between the directional position and the pressure is examined.
It is understood that the pressure distribution in the fixing nip area N in the embodiment shows a substantially uniform pressure in the nip area N ₂ (see FIG. 4) corresponding to the pressing pad, as shown in FIG. .
On the other hand, the pressure distribution in the fixing nip area N in the comparative example has a non-pressurized area in the nip area N ₂ (see FIG. 4) corresponding to the pressing pad, as shown in FIG. And it is understood that there is a lack of pressure.

１…剥離装置，２…押圧部材，２ａ…被支持部材，２ｂ…剥離部材，３…案内部，４…加圧部，５…突出部，１０…定着装置，１１…ベルト状回転体，１２…加圧回転体，１３…加熱源
DESCRIPTION OF SYMBOLS 1 ... Peeling device, 2 ... Pressing member, 2a ... Supported member, 2b ... Peeling member, 3 ... Guide part, 4 ... Pressure part, 5 ... Projection part, 10 ... Fixing device, 11 ... Belt-like rotary body, 12 ... Pressure rotating body, 13 ... Heat source

Claims

Provided on the downstream side in the moving direction of the belt-like rotator in the contact area between the belt-like rotator and the pressurizing rotator arranged in contact with the belt-like rotator. A peeling device arranged to form the contact area via the belt-like rotator and peeling the recording material attached to the belt-like rotator,
A pressing member that is provided so as to extend long along the width direction intersecting the moving direction of the belt-like rotator, and that presses the belt-like rotator so that the belt-like rotator contacts the pressing rotator side. When,
A guide portion that is provided on the pressure rotating body side of the pressing member and forms a bent portion in the belt-shaped rotating body, and guides the belt-shaped rotating body so that the bent portion bites into the pressure rotating body; ,
The pressure member is provided on the pressure rotator side and is formed so as to be separated from the pressure rotator as it goes from the center to the end in the longitudinal direction of the pressure member. A pressurizing unit that pressurizes the rotating body to form the contact area;
On the pressing rotator side of the pressing member, with respect to the crossing direction intersecting with the moving direction of the belt-like rotator, the central portion protrudes more convexly toward the upstream side of the contact area than both ends, and
A peeling apparatus comprising:

In the peeling apparatus of Claim 1,
The peeling device according to claim 1, wherein the guide portion guides the belt-like rotating body so as to bite into the pressure rotating body from a central portion to an end portion in a longitudinal direction of the pressing member.

The peeling apparatus according to claim 1 or 2,
The pressing member is composed of a supported member supported by a predetermined supporting portion and a peeling member provided along a contact surface between the supported member and a belt-like rotating body. Peeling device.

In the peeling apparatus in any one of Claims 1 thru | or 3,
The peeling device according to claim 1, wherein the pressing member is fixedly supported via a supporting member with respect to a holding member that can be held by the belt-like rotating body.

In the peeling apparatus in any one of Claims 1 thru | or 4,
The peeling device according to claim 1, wherein a contact surface of the pressing member with the belt-shaped rotating body has a lubricating layer capable of reducing a frictional force with the belt-shaped rotating body.

In the peeling apparatus of Claim 1,
The projecting portion is formed in a symmetrical and curved shape around the central portion in the intersecting direction.

In the peeling apparatus of Claim 1,
The protruding portion has a tip formed in a curved cross-section.

A belt-like heating rotator that rotates with at least the surface being heated;
The surface of the heating rotator is brought into pressure contact and rolls together with the heating rotator, and the recording material is sandwiched and conveyed between the heating rotators to heat and pressure-fix the unfixed toner image on the recording material. Pressure rotor,
The peeling apparatus according to any one of claims 1 to 7, which peels at least the recording material attached to the heating rotator,
A fixing device comprising:

9. A toner image producing device for forming an unfixed toner image on a recording material, and a fixing device according to claim 8, wherein the unfixed toner image on the recording material produced by the toner image producing device is fixed.
An image forming apparatus comprising: