JP2001022202A - Heating device and image forming device - Google Patents
Heating device and image forming deviceInfo
- Publication number
- JP2001022202A JP2001022202A JP11191511A JP19151199A JP2001022202A JP 2001022202 A JP2001022202 A JP 2001022202A JP 11191511 A JP11191511 A JP 11191511A JP 19151199 A JP19151199 A JP 19151199A JP 2001022202 A JP2001022202 A JP 2001022202A
- Authority
- JP
- Japan
- Prior art keywords
- film
- heating
- fixing
- heating device
- recording material
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】この発明は、加熱体に接触摺
動する耐熱性の定着フィルムと、この定着フィルムを駆
動し、かつ該定着フィルムを介して記録材を前記加熱体
に密着させる加圧体とを有し、前記加熱体と前記加圧体
により形成されるニップ部を前記定着フィルムと前記記
録材を一緒に挟持搬送させて該記録材を加熱する加熱装
置及びこの加熱装置を適用した複写機、レーザービーム
プリンタ等の画像形成装置に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat-resistant fixing film which slides in contact with a heating element, and a pressure for driving the fixing film and bringing a recording material into close contact with the heating element via the fixing film. And a heating device for heating the recording material by nipping and transporting the fixing film and the recording material together with a nip formed by the heating body and the pressing body, and applying the heating device. The present invention relates to an image forming apparatus such as a copying machine and a laser beam printer.
【０００２】[0002]
【従来の技術】従来、例えば記録材上に形成された未定
着トナー画像を該記録材に加熱定着する加熱装置には、
所定の温度に維持された加熱ローラと、弾性体層を介し
て前記加熱ローラに圧接する加圧ローラとによって、被
加熱体としての記録材を挟持搬送しつつ加熱する熱ロー
ラ方式が多用されている。また、このほかにもフラッシ
ュ加熱方式、オープン加熱方式、熱板加熱方式等種々の
方式、構成のものが知られており、実用されている。2. Description of the Related Art Conventionally, for example, a heating device for heating and fixing an unfixed toner image formed on a recording material to the recording material includes:
A heating roller system that heats a recording material as a member to be heated while nipping and transporting the same by using a heating roller maintained at a predetermined temperature and a pressure roller that presses the heating roller through an elastic layer is often used. I have. In addition, various systems and configurations such as a flash heating system, an open heating system, and a hot plate heating system are known and are in practical use.
【０００３】最近では、このような方式に代わって、図
７に示すように固定支持された加熱体（ヒータ）３と、
この加熱体３に対向圧接しつつ搬送される耐熱性フィル
ム（定着フィルム）２と、この定着フィルム２を介して
被加熱体としての記録材Ｐを加熱体３に密着させる加圧
体（加圧ローラ）４を有し、加熱体３の熱を定着フィル
ム２を介して記録材Ｐへ付与することで記録材面に形成
担持されている未定着トナー画像を記録材面に加熱定着
させる方式、構成の画像加熱定着方式（フィルム加熱方
式の加熱装置）が考案されている。Recently, instead of such a method, a heater (heater) 3 fixed and supported as shown in FIG.
A heat-resistant film (fixing film) 2 conveyed while being pressed against the heating member 3, and a pressing member (pressurizing member) that brings a recording material P as a heated member into close contact with the heating member 3 via the fixing film 2. A roller) 4 to apply heat of the heating element 3 to the recording material P via the fixing film 2 to heat and fix an unfixed toner image formed and carried on the recording material surface to the recording material surface. An image heating fixing system having a configuration (film heating system heating device) has been devised.
【０００４】このようなフィルム加熱方式の加熱装置な
いしは画像加熱定着装置においては、加熱体として低熱
容量加熱体を用いることができる。このため、従来の接
触加熱方式である熱ローラ方式、ベルト加熱方式等の装
置に比べ省電力及びウェイトタイムの短縮化（クイック
スタート）が可能になる。In such a film heating type heating apparatus or image heating and fixing apparatus, a low heat capacity heating body can be used as a heating body. For this reason, it is possible to save power and shorten the wait time (quick start) as compared with a conventional device such as a heat roller system or a belt heating system that is a contact heating system.
【０００５】[0005]
【発明が解決しようとする課題】ところで、図7に示す
ように従来の加熱装置では、定着フイルム２はステー1
に対し周長が余裕を持ってルーズに外嵌しているため、
図8に示すように定着フイルム２とステー1の間に隙間を
持っており、記録材Ｐが定着ニップ部Ｎ１に進入する前
は、定着フイルム２はステー１に対し端部、中央部とも
にほぼ同じ隙間Ｓ 0をもって回転している。The problem to be solved by the present invention is shown in FIG.
As described above, in the conventional heating device, the fixing film 2 is
Because the circumference is loosely fitted with a margin,
As shown in FIG. 8, a gap is provided between the fixing film 2 and the stay 1.
Before the recording material P enters the fixing nip N1
Means that the fixing film 2 has both ends and a center with respect to the stay 1.
Almost the same gap S 0It is rotating with.
【０００６】ところが、従来の加熱装置は定着フィルム
２の軸方向長さＬに対し幅の狭い記録材（以後、小サイ
ズ紙）、例えば２Ｌ／３程度の記録材Ｐを定着フィルム
軸方向のほぼ中央部に連続的に通すと、非通紙部では記
録材Ｐに熱が奪われないため、加圧ローラ４の非通紙部
の温度が記録材に熱が奪われる通紙部に対し高温になる
ため、熱膨張により加圧ローラ４の外径が通紙部に対し
て非通紙部の方が大きくなる。However, the conventional heating device is capable of feeding a recording material having a width narrower than the length L of the fixing film 2 in the axial direction (hereinafter, small-size paper), for example, a recording material P of about 2L / 3 in the axial direction of the fixing film. When the recording material P is continuously passed through the central portion, the heat is not deprived by the recording material P in the non-paper passing portion. Therefore, due to thermal expansion, the outer diameter of the pressure roller 4 is larger in the non-sheet passing portion than in the sheet passing portion.
【０００７】すると、加圧ローラ４の周速も非通紙部の
方が速くなり、定着ニップ部Ｎｌでの定着フィルム２の
搬送速度が通紙部より非通紙部の方が大きくなり速度差
が生じ、通紙部と非通紙部でねじれ力が働く。このた
め、図９に示すように定着ニップ部Ｎ１直前で定着フィ
ルム２とステー１の間の隙間量が端部では小さく、中央
部では大きくなり、Ｓ2＞Ｓ0＞Ｓ1という関係になるた
め、定着ニップ部Ｎ１直前で定着フィルム２がたるんだ
状態になる。[0007] Then, the peripheral speed of the pressure roller 4 is higher in the non-sheet passing portion, and the conveying speed of the fixing film 2 in the fixing nip portion Nl is higher in the non-sheet passing portion than in the sheet passing portion. A difference occurs, and a twisting force acts on the paper passing portion and the non-paper passing portion. Therefore, amount of clearance between the fixing film 2 and the stay 1 at the fixing nip portion N1 immediately before as shown in FIG. 9 is small at the end, becomes large at the central portion, a relation of S 2> S 0> S 1 Therefore, the fixing film 2 becomes slack immediately before the fixing nip portion N1.
【０００８】このような状態で記録材が定着ニップ部Ｎ
１に進入してくると、記録材はたるんだ定着フィルム２
の弾性により進入抵抗を受け、記録材先端の長手方向に
おける定着ニップ部Ｎ１への進入タイミングにばらつき
が発生し、記録材にしわが発生するという課題があっ
た。In such a state, the recording material is fixed to the fixing nip N
When entering 1, the recording material is slack and the fixing film 2
There is a problem that the penetration resistance is caused by the elasticity of the recording material, and the timing at which the leading end of the recording material enters the fixing nip portion N1 in the longitudinal direction varies, and the recording material is wrinkled.
【０００９】この発明は上記のような課題を解消するた
めになされたもので、小サイズの記録材の連続通紙時に
おける加圧ローラの外径の熱膨張変化による不都合を解
消し、記録材のしわの発生を防止した加熱装置を得るこ
とを目的とする。SUMMARY OF THE INVENTION The present invention has been made to solve the above-described problems, and has been made to solve the problem caused by the thermal expansion change of the outer diameter of the pressure roller when a small-sized recording material is continuously fed. It is an object of the present invention to obtain a heating device in which wrinkles are prevented from occurring.
【００１０】また、この加熱装置を適用して高品質の画
像形成を行うことができる画像形成装置を得ることを目
的とする。Another object of the present invention is to provide an image forming apparatus capable of forming a high quality image by applying the heating device.
【００１１】[0011]
【課題を解決するための手段】この発明は次の構成を有
することを特徴とする加熱装置及び画像形成装置であ
る。According to the present invention, there is provided a heating apparatus and an image forming apparatus having the following constitution.
【００１２】（１）加熱体に接触摺動する耐熱性の定着
フィルムと、この定着フィルムを駆動し、かつ該定着フ
ィルムを介して記録材を前記加熱体に密着させる加圧体
とを有し、前記加熱体と前記加圧体により形成されるニ
ップ部を前記定着フィルムと前記記録材を一緒に挟持搬
送させて該記録材を加熱する加熱装置において、前記加
圧体は少なくとも剛体で形成された芯金部材と弾性部材
からなるローラ形状であり、この加圧体に被せた該加圧
体の外径よりも径が大きく該加圧体表面と摺動可能なエ
ンドレスフィルムを備えたことを特徴とする加熱装置。(1) A heat-resistant fixing film that slides in contact with a heating element, and a pressure element that drives the fixing film and brings a recording material into close contact with the heating element via the fixing film. A heating device that heats the recording material by nipping and conveying the fixing film and the recording material together with a nip formed by the heating body and the pressure body, wherein the pressure body is at least formed of a rigid body A roller formed of a cored metal member and an elastic member, and having an endless film slidable on the surface of the pressing body, the diameter being larger than the outer diameter of the pressing body covered on the pressing body. Characteristic heating device.
【００１３】（２）エンドレスフィルムの両端部に該エ
ンドレスフィルムの位置を規制する位置規制部材を設け
たことを特徴とする（１）記載の加熱装置。(2) The heating device according to (1), wherein a position regulating member for regulating the position of the endless film is provided at both ends of the endless film.
【００１４】（３）エンドレスフィルムの軸方向の長さ
は加圧体の軸方向の長さよりも長く、位置規制部材は前
記エンドレスフィルム端部において該エンドレスフィル
ム内に入り込む構成であることを特徴とする（２）記載
の加熱装置。(3) The length of the endless film in the axial direction is longer than the length of the pressing body in the axial direction, and the position regulating member is configured to enter the endless film at the end of the endless film. (2) The heating device according to (2).
【００１５】（４）位置規制部材は加圧体の軸受けを兼
ねることを特徴とする（２）または（３）記載の加熱装
置。(4) The heating device according to (2) or (3), wherein the position regulating member also serves as a bearing for the pressurizing member.
【００１６】（５）エンドレスフィルムの弾性率がｌ０
０Ｋｇ／ｍｍ2以上であることを特徴とする（１）〜
（4）のうちのいずれか1項記載の加熱装置。(5) The elastic modulus of the endless film is 10
0 kg / mm 2 or more (1)-
The heating device according to any one of (4).
【００１７】（６）エンドレスフィルムはポリイミドか
らなることを特徴とする（１）〜（５）のうちのいずれ
か1項記載の加熱装置。(6) The heating device according to any one of (1) to (5), wherein the endless film is made of polyimide.
【００１８】（７）記録材に未定着トナー画像を形成担
持させる作像手段と、前記記録材に形成担持させた未定
着トナー画像を該記録材に加熱定着させる加熱手段を有
する画像形成装置において、前記加熱手段として（１）
〜（６）のうちのいずれか１項記載の加熱装置を備えた
ことを特徴とする画像形成装置。(7) An image forming apparatus having image forming means for forming and carrying an unfixed toner image on a recording material and heating means for heating and fixing the unfixed toner image formed and carried on the recording material to the recording material. , As the heating means (1)
An image forming apparatus, comprising: the heating device according to any one of (6) to (6).
【００１９】[0019]
【発明の実施の形態】以下、この発明の実施の一形態を
添付図面について説明する。An embodiment of the present invention will be described below with reference to the accompanying drawings.
【００２０】実施の形態１．図１はこの実施の形態１と
して、フィルム加熱方式の最大通紙幅がＡ３サイズであ
る加熱装置の一例を示す概略構成図である。この加熱装
置は例えば、特開平４−４４０７５号公報〜特開平４−
４４０８３号公報、特開平４−２０４９８０号公報〜特
開平４−２０４９８４号公報等に開示の所謂テンション
レスタイプの装置である。このテンションレスタイプの
装置は耐熱性定着フィルムとしてエンドレスベルト状も
しくは円筒状を用い、この定着フィルムの周長の少なく
とも一部は常にテンションフリー（テンションが加わら
ない状態）とし、定着フィルムは加圧部材の回転駆動力
で回転駆動するようにした装置である。Embodiment 1 FIG. 1 is a schematic configuration diagram illustrating an example of a heating device according to a first embodiment, in which a maximum sheet passing width of a film heating method is A3 size. This heating device is disclosed in, for example, JP-A-4-44075 to JP-A-4-44075.
This is a so-called tensionless type device disclosed in JP-A-44083, JP-A-4-204980 to JP-A-4-204984, and the like. This tensionless type device uses an endless belt or a cylindrical shape as a heat-resistant fixing film, and at least a part of the circumference of the fixing film is always tension-free (state in which tension is not applied). It is a device that is driven to rotate by the rotational driving force of the above.
【００２１】図１において、１は定着フイルム２のガイ
ド部材を兼ねた加熱体（ヒータ）３のステーである。定
着フイルム２はエンドレスの耐熱性定着フィルムであ
り、加熱体３を含むステー１に外嵌させてある。このエ
ンドレスの耐熱性定着フィルム２の内周長と加熱体３を
含むステー１の外周長は定着フィルム２の方を例えば３
ｍｍ程度大きくしてあり、したがって定着フィルム２は
周長が余裕を持って外嵌している。In FIG. 1, reference numeral 1 denotes a stay of a heater (heater) 3 which also serves as a guide member of the fixing film 2. The fixing film 2 is an endless heat-resistant fixing film, and is fitted around the stay 1 including the heating element 3. The inner peripheral length of the endless heat-resistant fixing film 2 and the outer peripheral length of the stay 1 including the heating element 3 are, for example, 3
mm, so that the fixing film 2 is externally fitted with a sufficient peripheral length.
【００２２】４は加圧体としての加圧ローラであり、加
圧ローラ４の外側には摺動フィルムとして、加圧ローラ
４の外径よりも内径を大きくしたチューブ状のフイルム
６が外嵌されている。加圧ローラ４は、加熱体３との間
に定着フィルム２及び加圧ローラ４の周りのフィルム６
を挟んで圧接ニップ部（定着ニップ部）Ｎ１を形成し、
かつ定着フィルム２及びフィルム６を回転駆動させてい
る。Reference numeral 4 denotes a pressure roller as a pressure member, and a tubular film 6 having an inner diameter larger than the outer diameter of the pressure roller 4 is externally fitted as a sliding film outside the pressure roller 4. Have been. The pressure roller 4 has a fixing film 2 and a film 6 around the pressure roller 4 between the pressure roller 4 and the heating element 3.
To form a pressure contact nip portion (fixing nip portion) N1
Further, the fixing film 2 and the film 6 are driven to rotate.
【００２３】定着フィルム２は熱容量を小さくしてクイ
ックスタート性を向上させるために、フィルム膜厚は１
００μｍ以下、好ましくは５０μｍ以下２０μｍ以上の
耐熱性のあるＰＴＦＥ，ＰＦＡ，ＦＥＰ等の単層フィル
ム、或いはポリイミド、ポリアミドイミド、ＰＥＥＫ，
ＰＥＳ，ＰＰＳ等のフィルムの外周表面にＰＴＦＥ，Ｐ
ＦＡ，ＦＥＰ等をコーティングした複合層フィルムを使
用できる。この実施の形態１ではポリイミドフィルムの
外周表面にＰＴＦＥをコーティングしたものを用いた。The fixing film 2 has a film thickness of 1 to reduce the heat capacity and improve the quick start property.
A heat-resistant single-layer film of PTFE, PFA, FEP or the like having a thickness of not more than 00 μm, preferably not more than 50 μm and not less than 20 μm, or polyimide, polyamideimide, PEEK,
PTFE, PPS on the outer surface of the film such as PES, PPS
A composite layer film coated with FA, FEP or the like can be used. In the first embodiment, a polyimide film whose outer peripheral surface is coated with PTFE is used.
【００２４】図２は加熱体３をその途中部を省略し、一
部を切り欠いて示した平面模型図であり、耐熱性定着フ
ィルム２もしくは被加熱体としての記録材Ｐの搬送方向
ａに対して直角方向を長手とする細長の耐熱性・絶縁性
・良熱伝導性の基板３１、この基板の表面側の短手方向
中央部に基板長手に沿って形成具備させた抵抗発熱体３
２、この抵抗発熱体を形成した加熱体表面を保護させた
耐熱性オーバーコート層３４、抵抗発熱体３２の長手両
端部の給電用電極２１・２２、基板裏面側に具備させ
た、加熱体温度を検知するサーミスタ等の検温素子５等
からなる全体に低熱容量の線状加熱体である。FIG. 2 is a schematic plan view of the heating element 3 in which a part of the heating element 3 is omitted and partly cut away. The heating element 3 is moved in the transport direction a of the heat-resistant fixing film 2 or the recording material P as the object to be heated. An elongated heat-resistant, insulating and well-heat-conductive substrate 31 having a longitudinal direction perpendicular to the longitudinal direction, and a resistive heating element 3 formed along the longitudinal direction of the substrate at the center in the lateral direction on the front side of the substrate.
2. The heat-resistant overcoat layer 34 that protects the surface of the heating element on which the resistance heating element is formed, the power supply electrodes 21 and 22 at both longitudinal ends of the resistance heating element 32, and the heating element temperature provided on the back side of the substrate. Is a linear heating element having a low heat capacity as a whole including a temperature detecting element 5 such as a thermistor for detecting the temperature.
【００２５】この加熱体３は抵抗発熱体３２を形成具備
させた表面側を下向きに露呈させて、剛性・耐熱性を有
するステー１の下面側に保持させて固定配設してある。
加熱体基板３１は、例えば、アルミナや窒化アルミニウ
ム等の厚み１ｍｍ・幅１０ｍｍ・長さ３３０ｍｍのもの
である。抵抗発熱体３２は、例えば、Ａｇ／Ｐｄ（銀パ
ラジウム）、ＲｕＯ2、Ｔａ2Ｎ等の電気抵抗材料をスク
リーン印刷等により、厚み約１０μｍ、幅１〜３ｍｍの
線状もしくは線帯状に塗工して形成したものである。給
電用電極２１・２２は例えばＡｇ等のスクリーン印刷パ
ターン層である。オーバーコート層３４は例えば約１０
μｍ厚の耐熱性ガラス層である。The heating element 3 is fixedly arranged so that the surface on which the resistance heating element 32 is formed is exposed downward and held on the lower surface of the rigid and heat-resistant stay 1.
The heating substrate 31 is, for example, one having a thickness of 1 mm, a width of 10 mm, and a length of 330 mm, such as alumina or aluminum nitride. The resistance heating element 32 is, for example, coated with an electric resistance material such as Ag / Pd (silver palladium), RuO 2 , Ta 2 N, etc. by screen printing or the like into a linear or linear strip having a thickness of about 10 μm and a width of 1 to 3 mm. It is formed. The power supply electrodes 21 and 22 are, for example, a screen printing pattern layer of Ag or the like. The overcoat layer 34 is, for example, about 10
It is a heat-resistant glass layer having a thickness of μm.
【００２６】加圧ローラ４は芯金４ａとシリコーンゴム
等よりなる弾性体層４ｂとからなり、不図示の軸受け手
段・付勢手段により所定の抑圧力をもって定着フィルム
２及びフィルム６を挟ませて加熱体３の表面に圧接させ
て配設してある。この加圧ローラ４の回転駆動により、
定着フィルム２及びフィルム６に回転力が作用する。ま
た、弾性体層４ｂの外側にフッ素樹脂等で形成された離
形層を設けてもよい。The pressure roller 4 comprises a cored bar 4a and an elastic layer 4b made of silicone rubber or the like. The heater 3 is disposed in pressure contact with the surface. By the rotational drive of the pressure roller 4,
Rotational force acts on the fixing film 2 and the film 6. Further, a release layer formed of a fluororesin or the like may be provided outside the elastic layer 4b.
【００２７】フィルム６は、高弾性のチューブ体であ
り、これを遊嵌させた加圧ローラ４との間で摺動性を有
すると同時に、定着フィルム２との間にも摺動性を有す
る。フィルム６が薄く剛性がないと、フィルム６の回転
時にねじれ、しわ等の不具合が発生するとともに、フィ
ルム６の寄り制御等が必要になるため加熱装置が複雑に
なり、コストが高くなる。The film 6 is a highly elastic tube, which has a sliding property with the pressure roller 4 on which the film 6 is loosely fitted, and also has a sliding property with the fixing film 2. . If the film 6 is thin and lacks rigidity, problems such as twisting and wrinkling occur during the rotation of the film 6, and the control of the deviation of the film 6 is required, so that the heating device becomes complicated and the cost increases.
【００２８】よって、フィルム６は高弾性で厚みがある
もの、望ましくは厚み１００μｍ程度のものが望まし
く、この実施の形態１ではこの特性を確保するために、
厚さ１００μｍのポリイミドで弾性率１００ｋｇ／ｍｍ
2以上のものを使用している。なお、材質はポリイミド
でなくとも高弾性率を示すものであればよい。また、離
形性を確保するために、フィルム６の記録材側にフッ素
樹脂層等の離形層を設けてもよい。Therefore, the film 6 should be highly elastic and thick, preferably about 100 μm thick. In the first embodiment, in order to secure this characteristic,
100μm thick polyimide with elastic modulus 100kg / mm
We are using two or more of those. The material is not limited to polyimide as long as it shows a high elastic modulus. Further, in order to ensure releasability, a release layer such as a fluororesin layer may be provided on the recording material side of the film 6.
【００２９】図３はこの実施の形態１の加熱装置の斜視
図を、図４にこの実施の形態１の加圧ローラ４端部の拡
大図を示すもので、図３、図４において、７はフィルム
６のフィルム長手方向への動きを端部で規制する位置規
制部材としての左右一対のフランジガイドである。FIG. 3 is a perspective view of the heating device of the first embodiment, and FIG. 4 is an enlarged view of the end of the pressure roller 4 of the first embodiment. Reference numeral denotes a pair of left and right flange guides as position regulating members for regulating the movement of the film 6 in the longitudinal direction of the film at the ends.
【００３０】この位置規制部材７は、加圧ローラ４の両
端部外側からｂの方向に組み込まれる。この位置規制部
材７は例えばＰＴＦＥ等の滑性の高い部材である。フィ
ルム６の長手方向の長さは加圧ローラ４の長手方向の長
さよりも長くして、図４に示すように位置規制部材７が
フィルム６の内側に入り込む形状になっている。これ
は、位置規制部材７でフィルム６の断面形状が円に近く
なるように規制し、フィルム６の走行安定性を確保する
のが目的である。The position regulating member 7 is incorporated in the direction b from the outside of both ends of the pressure roller 4. The position regulating member 7 is a member having high lubricity such as PTFE. The length of the film 6 in the longitudinal direction is longer than the length of the pressing roller 4 in the longitudinal direction, so that the position regulating member 7 enters the inside of the film 6 as shown in FIG. This is for the purpose of restricting the cross-sectional shape of the film 6 to be close to a circle by the position restricting member 7 and securing the running stability of the film 6.
【００３１】また、加圧ローラ４は所定の押圧力をもっ
て定着フイルム２及びフイルム６を挟ませて加熱体３の
表面に圧接させるので、定着ニップ部Ｎｌにおける断面
形状は平坦になり、フィルム６の断面形状もそれになら
う。よって、フィルム６の回転を滑らかにするために、
位置規制部材７の断面形状も定着ニップ部１１に相当す
る部分で平坦になるようにしてある。この実施の形態１
ではフィルム６に高弾性で厚みのあるものを用いている
ので、フィルム６に対する複雑な寄り制御等を必要とせ
ず、以上のような簡単な構成でフィルム６の走行安定性
を確保できる。Further, since the pressure roller 4 presses the fixing film 2 and the film 6 with a predetermined pressing force and presses against the surface of the heating body 3, the cross-sectional shape at the fixing nip portion Nl becomes flat, and the film 6 The cross-sectional shape follows. Therefore, in order to make the rotation of the film 6 smooth,
The sectional shape of the position regulating member 7 is also made flat at a portion corresponding to the fixing nip portion 11. Embodiment 1
Since the film 6 is made of a material having high elasticity and thickness, the running stability of the film 6 can be secured with the above simple structure without the need for complicated deviation control or the like for the film 6.
【００３２】加熱体３は、抵抗発熱体３２の長手両端部
の給電用電極２１・２２に対する給電により該抵抗発熱
体３２が長手全長にわたって発熱することで昇温し、そ
の昇温が検温素子５で検知される。その検温素子５の出
力をＡ／Ｄ変換しＣＰＵ２４に取り込み、その情報をも
とに抵抗発熱体３２に通電するＡＣ電源２６のＡＣ電圧
を位相、波数制御等により、トライアック２５に対する
加熱体通電電力を制御し、加熱体３の温度制御が行われ
る。The temperature of the heating element 3 rises as the resistance heating element 32 generates heat over the entire length thereof by supplying power to the power supply electrodes 21 and 22 at both longitudinal ends of the resistance heating element 32. It is detected by. The output of the temperature detecting element 5 is A / D converted and fetched into the CPU 24, and based on the information, the AC voltage of the AC power supply 26, which is energized to the resistance heating element 32, is controlled by the phase, wave number, etc. And the temperature of the heating element 3 is controlled.
【００３３】即ち、検温素子５の検知温度が所定の設定
温度より低いと、加熱体３が昇温するように、設定温度
より高いと降温するように通電を制御することで、加熱
体３は定着時一定温調される。而して、加熱体３の温度
が所定温度に立ち上がり、かつ加圧ローラ４の回転によ
る定着フィルム２及びフィルム６の回転周速度が定常化
した状態において、定着フィルム２及びフィルム６を挟
んで加熱体３と加圧ローラ４とで形成される圧接ニップ
部Ｎ１の該定着フィルムと該フィルムとの間に被加熱体
としての記録材Ｐが不図示の画像形成部（転写部）より
導入されて、定着フィルム２及びフィルム６と一緒に圧
接ニップ部Ｎ１を挟持搬送されることにより、加熱体３
の熱が定着フィルム２を介して記録材Ｐに付与され記録
材Ｐ上の未定着顕画像（トナー画像）Ｔが記録材Ｐ面に
加熱定着される。圧接ニップ部Ｎ１を通った記録材Ｐ
は、定着フィルム２及びフィルム６の面から分離されて
搬送される。That is, by controlling the energization so that the temperature of the heating element 3 rises when the temperature detected by the temperature detecting element 5 is lower than the predetermined set temperature, and to lower the temperature when the temperature is higher than the set temperature, the heating element 3 The temperature is fixed at the time of fixing. In a state where the temperature of the heating element 3 rises to a predetermined temperature and the rotation peripheral speeds of the fixing film 2 and the film 6 due to the rotation of the pressure roller 4 are stabilized, the heating is performed with the fixing film 2 and the film 6 interposed therebetween. A recording material P as an object to be heated is introduced from an image forming section (transfer section) (not shown) between the fixing film and the film in a pressing nip portion N1 formed by the body 3 and the pressure roller 4. The pressing body nip N1 is pinched and conveyed together with the fixing film 2 and the film 6, so that the heating element 3
Is applied to the recording material P via the fixing film 2, and the unfixed visible image (toner image) T on the recording material P is heated and fixed to the surface of the recording material P. Recording material P passed through pressure nip N1
Is transported separately from the surfaces of the fixing film 2 and the film 6.
【００３４】この実施の形態１では、この記録材Ｐに発
生するしわを防止するために加圧ローラ４の周りにフィ
ルム６を設け、フィルム６の長手方向位置規制及び走行
形状安定のために位置規制部材７を設けている。この構
成の加熱装置において、小サイズ紙が連続通紙された場
合、前述した理由のため、加圧ローラ４の非通紙部の周
速は通紙部よりも速くなる。In the first embodiment, the film 6 is provided around the pressure roller 4 in order to prevent the wrinkles generated in the recording material P, and the film 6 is positioned in order to regulate the longitudinal position of the film 6 and stabilize the running shape. A regulating member 7 is provided. In the heating device having this configuration, when small-sized paper is continuously passed, the peripheral speed of the non-paper passing portion of the pressure roller 4 becomes faster than that of the paper passing portion for the above-described reason.
【００３５】しかし、加圧ローラ４はフィルム６を介し
て定着フィルム２に接触しており、かつフィルム６は加
圧ローラ４及び定着フィルム２に対して摺動可能である
ので、加圧ローラ４の通紙部と非通紙部との周速差はフ
ィルム６により緩和されて定着フィルム２に伝わる。そ
の結果、従来の加熱装置で生じていた定着フィルム２の
通紙部と非通紙部との搬送速度差は低減され、定着ニッ
プ部Ｎ１直前で生じていた定着フィルム２のたるみ量も
小さくなる。However, since the pressure roller 4 is in contact with the fixing film 2 via the film 6 and the film 6 is slidable with respect to the pressure roller 4 and the fixing film 2, the pressure roller 4 The peripheral speed difference between the paper passing portion and the non-paper passing portion is reduced by the film 6 and transmitted to the fixing film 2. As a result, the difference in the conveyance speed between the paper passing portion and the non-paper passing portion of the fixing film 2 caused by the conventional heating device is reduced, and the amount of slack of the fixing film 2 generated immediately before the fixing nip portion N1 is also reduced. .
【００３６】すなわち、図９で述べた従来の加熱装置中
央部のステー１と定着フィルム２との隙間Ｓ2とこの実
施の形態１の加熱装置中央部のステー１と定着フィルム
２との隙間Ｓ2’（図示せず）とでは、Ｓ2＞Ｓ2’とい
う関係がある。このステー１と定着フィルム２との隙間
が小さいほど、記録材Ｐの定着ニップ部Ｎ１突入時に受
ける抵抗が小さくなり、記録材Ｐにしわが発生しにくく
なる。結局、この実施の形態１の構成をとることによっ
て、記録材Ｐにしわが発生しなくなる程度に定着フィル
ム２のたるみをなくすことができる。また、この実施の
形態１で述べたようなフィルム６を直接加圧ローラの表
面に接着しても、小サイズ紙連続通紙時の加圧ローラ端
部の熱膨張を抑えることができるので、記録材Ｐのしわ
は防止できる。ただし、この構成をとる場合、加圧ロー
ラ４の硬度が高くなるので、定着性を確保するための十
分な定着ニップ幅がとりづらいという問題がある。この
実施の形態１では、フィルム６は加圧ローラ４にルーズ
に外嵌させているので、定着性を確保するために必要な
定着ニップ幅Ｎｌは十分にとることができる。That is, the gap S 2 between the stay 1 at the center of the conventional heating device and the fixing film 2 described in FIG. 9 and the gap S between the stay 1 at the center of the heating device and the fixing film 2 according to the first embodiment. 2 ′ (not shown) has a relationship of S 2 > S 2 ′. As the gap between the stay 1 and the fixing film 2 is smaller, the resistance of the recording material P when the recording material P enters the fixing nip portion N1 becomes smaller, and the recording material P is less likely to wrinkle. After all, by adopting the configuration of the first embodiment, it is possible to eliminate the slack of the fixing film 2 to such an extent that the recording material P does not wrinkle. Further, even if the film 6 as described in the first embodiment is directly adhered to the surface of the pressure roller, the thermal expansion of the end of the pressure roller when the small-size paper is continuously fed can be suppressed. Wrinkling of the recording material P can be prevented. However, in the case of this configuration, since the hardness of the pressure roller 4 becomes high, there is a problem that it is difficult to secure a sufficient fixing nip width for securing the fixing property. In the first embodiment, since the film 6 is loosely fitted to the pressure roller 4, the fixing nip width Nl necessary for securing the fixing property can be sufficiently set.
【００３７】実施の形態２．この実施の形態２では、実
施の形態１で説明した加熱装置において、位置規制部材
７が加圧ローラ４の軸受けを兼ねる。その他の構成は、
実施の形態１と同様である。Embodiment 2 In the second embodiment, in the heating device described in the first embodiment, the position regulating member 7 also serves as a bearing for the pressure roller 4. Other configurations are
This is the same as in the first embodiment.
【００３８】図５はこの実施の形態２の加熱装置の斜視
図を示すもので、位置規制部材７に軸受け部８を設け、
この位置規制部材７と軸受け部８は一体である。この構
成により、実施の形態１と同様に小サイズ紙通紙時のし
わの発生を抑えることが可能であるとともに、部品を減
らし加熱装置製造時のコストを削減することができる。FIG. 5 is a perspective view of a heating device according to the second embodiment, in which a bearing 8 is provided on a position regulating member 7.
The position regulating member 7 and the bearing portion 8 are integrated. With this configuration, similarly to the first embodiment, it is possible to suppress the occurrence of wrinkles when passing small-sized paper, and it is possible to reduce the number of components and the cost of manufacturing the heating device.
【００３９】実施の形態３．図６はこの発明の加熱装置
を適用した実施の形態３における画像形成装置としての
レーザービームプリンタの要部を示す図であり、図６に
おいて、１０１は像担持体としての有機感光ドラム、１
０２は有機感光ドラムの表面を一様に帯電する帯電部材
としての帯電ローラ、１０３はレーザー露光装置、１０
４は現像スリーブ及び現像ブレードならびに１成分磁性
トナー等からなる現像装置、１０５はクリーニングブレ
ード、１０６は転写ローラ、１０７は定着装置としての
実施の形態１または実施の形態２の加熱装置である。Embodiment 3 FIG. 6 is a diagram showing a main part of a laser beam printer as an image forming apparatus according to Embodiment 3 to which the heating device of the present invention is applied. In FIG. 6, reference numeral 101 denotes an organic photosensitive drum as an image carrier;
02, a charging roller as a charging member for uniformly charging the surface of the organic photosensitive drum; 103, a laser exposure device;
Reference numeral 4 denotes a developing device including a developing sleeve and a developing blade, a one-component magnetic toner, etc., 105 a cleaning blade, 106 a transfer roller, and 107 a heating device according to the first or second embodiment as a fixing device.
【００４０】次に動作について説明する。Next, the operation will be described.
【００４１】有機感光ドラム１０１の表面は帯電ローラ
１０２によって一様に負の電荷に帯電され、レーザー露
光装置１０３からのレーザービームによって静電潜像が
形成される。次に、現像装置１０４の中を移動中に帯電
したトナーが有機感光ドラム１０１上の静電潜像に付着
し可視像となり、この可視像は転写ローラ１０６との対
向部移動中に記録材としての紙Ｐに転写され、定着装置
１０７で紙に加熱定着される。クリーニングブレード１
０５は有機感光ドラム１０１上に残ったトナーを除去す
る。The surface of the organic photosensitive drum 101 is uniformly charged to a negative charge by the charging roller 102, and an electrostatic latent image is formed by a laser beam from the laser exposure device 103. Next, the toner charged while moving in the developing device 104 adheres to the electrostatic latent image on the organic photosensitive drum 101 to become a visible image, and this visible image is recorded while moving in a portion facing the transfer roller 106. The image is transferred to paper P as a material, and is heat-fixed to the paper by the fixing device 107. Cleaning blade 1
05 removes toner remaining on the organic photosensitive drum 101.
【００４２】[0042]
【発明の効果】以上説明したように、この発明によれ
ば、加圧ローラの周りに加圧ローラ径よりも内径が大き
くかつ高弾性のフィルムをルーズに外嵌させているの
で、小サイズ紙連続通紙時に生じる加圧ローラの通紙部
と非通紙部との熱膨張に起因する周速差による定着フィ
ルムの通紙部と非通紙部との搬送速度差が、加圧ローラ
の周りに設けたフィルムにより緩和され、定着ニップ部
直前で生じていた定着フィルムのたるみが解消されて、
記録材のしわの発生を防止することができるという効果
がある。As described above, according to the present invention, since a film having a larger inner diameter than the diameter of the pressure roller and a highly elastic film is loosely fitted around the pressure roller, small-size paper can be obtained. The difference in transport speed between the paper passing portion and the non-paper passing portion of the fixing film due to the peripheral speed difference caused by the thermal expansion between the paper passing portion and the non-paper passing portion of the pressure roller that occurs during continuous paper passing is determined by the pressure roller. It is alleviated by the film provided around, the slack of the fixing film that occurred just before the fixing nip part is eliminated,
There is an effect that wrinkling of the recording material can be prevented.
【００４３】また、上記フイルムによって、十分に定着
ニップ幅がとれ、かつフィルムに対する複雑な寄り制御
を必要としない簡単な装置構成を用いて、記録材のしわ
を防止することが可能になるという効果がある。Further, the above-mentioned film can prevent the wrinkling of the recording material by using a simple apparatus configuration which can sufficiently secure the fixing nip width and does not require complicated deviation control for the film. There is.
【００４４】さらに、製造上のばらつきで生じる太鼓状
の膨らみをもった定着フィルムを使用した場合、膨らん
だ部分がたるみとなってしわが発生しやすくなるため、
定着フィルムの形状規格を厳しくする必要があったが、
この発明により定着フィルムの形状規格が緩和され、歩
留まりが上がりコストダウンが可能となる等の効果があ
る。Further, when a fixing film having a drum-shaped bulge generated due to manufacturing variations is used, the bulged portion becomes slack and wrinkles easily occur.
Although it was necessary to tighten the shape standard of the fixing film,
According to the present invention, the standard of the shape of the fixing film is relaxed, so that the yield is increased and the cost can be reduced.
【００４５】また、この加熱装置を適用したので、高品
質の画像形成を行うことができる画像形成装置を提供で
きる効果がある。Further, since this heating apparatus is applied, there is an effect that an image forming apparatus capable of forming a high quality image can be provided.
【図１】この発明の実施の形態１に基づく加熱装置の概
略構成図である。FIG. 1 is a schematic configuration diagram of a heating device according to Embodiment 1 of the present invention.
【図２】この加熱装置における加熱体の一部切り欠き途
中部省略の平面図である。FIG. 2 is a plan view of the heating device in which a part of a heating element is partially cut away and a part thereof is omitted.
【図３】実施の形態１に基づく加熱装置の斜視図であ
る。FIG. 3 is a perspective view of a heating device according to the first embodiment.
【図４】実施の形態１に基づく加圧ローラ端部の拡大図
である。FIG. 4 is an enlarged view of an end portion of a pressure roller according to the first embodiment.
【図５】実施の形態２に基づく加熱装置の斜視図であ
る。FIG. 5 is a perspective view of a heating device according to a second embodiment.
【図６】この発明の加熱装置を備えたレーザービームプ
リンタの要部を示す概略構成図である。FIG. 6 is a schematic configuration diagram showing a main part of a laser beam printer provided with a heating device of the present invention.
【図７】従来の加熱装置の概略構成図である。FIG. 7 is a schematic configuration diagram of a conventional heating device.
【図８】定着フィルムとステーの間の隙間を表す概略図
である。FIG. 8 is a schematic diagram illustrating a gap between a fixing film and a stay.
【図９】小サイズ紙連続通紙時の定着フィルムとステー
の間の隙間を表す概略図である。FIG. 9 is a schematic diagram showing a gap between a fixing film and a stay when small-size paper is continuously passed.
１ ステー、２ 定着フィルム、３ ヒータ（加熱
体）、４ 加圧ローラ（加圧体）、４ａ 芯金、４ｂ
弾性体層、５ 検温素子、６ フィルム、７ フィルム
規制部材、Ｎ１ ニップ部、Ｐ 記録材。1 stay, 2 fixing film, 3 heater (heating body), 4 pressing roller (pressing body), 4a cored bar, 4b
Elastic layer, 5 temperature sensor, 6 film, 7 film regulating member, N1 nip, P recording material.
Claims (7)
ルムと、この定着フィルムを駆動し、かつ該定着フィル
ムを介して記録材を前記加熱体に密着させる加圧体とを
有し、前記加熱体と前記加圧体により形成されるニップ
部を前記定着フィルムと前記記録材を一緒に挟持搬送さ
せて該記録材を加熱する加熱装置において、前記加圧体
は少なくとも剛体で形成された芯金部材と弾性部材から
なるローラ形状であり、この加圧体に被せた該加圧体の
外径よりも径が大きく該加圧体表面と摺動可能なエンド
レスフィルムを備えたことを特徴とする加熱装置。1. A heat-resistant fixing film that slides in contact with a heating element, and a pressure element that drives the fixing film and brings a recording material into close contact with the heating element via the fixing film. In a heating device for heating the recording material by nipping and transporting the fixing film and the recording material together with a nip portion formed by the heating body and the pressure body, the pressure body is at least formed of a rigid body A roller shape comprising a cored member and an elastic member, comprising an endless film which is larger in diameter than the outer diameter of the pressing body covered on the pressing body and is slidable on the surface of the pressing body. And a heating device.
レスフィルムの位置を規制する位置規制部材を設けたこ
とを特徴とする請求項１記載の加熱装置。2. The heating device according to claim 1, wherein a position regulating member for regulating the position of the endless film is provided at both ends of the endless film.
圧体の軸方向の長さよりも長く、位置規制部材は前記エ
ンドレスフィルム端部において該エンドレスフィルム内
に入り込む構成であることを特徴とする請求項２記載の
加熱装置。3. The endless film is characterized in that the axial length of the endless film is longer than the axial length of the pressing body, and the position regulating member is configured to enter the endless film at the end of the endless film. The heating device according to claim 2.
ことを特徴とする請求項２または請求項３記載の加熱装
置。4. The heating device according to claim 2, wherein the position regulating member also serves as a bearing for the pressing body.
ｇ／ｍｍ2以上であることを特徴とする請求項１〜請求
項4のうちのいずれか1項記載の加熱装置。5. The elastic modulus of the endless film is 100K.
5. The heating device according to claim 1, wherein the heating device is g / mm 2 or more.
ることを特徴とする請求項１〜請求項５のうちのいずれ
か1項記載の加熱装置。6. The heating device according to claim 1, wherein the endless film is made of polyimide.
せる作像手段と、前記記録材に形成担持させた未定着ト
ナー画像を該記録材に加熱定着させる加熱手段を有する
画像形成装置において、前記加熱手段として請求項１〜
請求項６のうちのいずれか１項記載の加熱装置を備えた
ことを特徴とする画像形成装置。7. An image forming apparatus comprising: image forming means for forming and carrying an unfixed toner image on a recording material; and heating means for heating and fixing the unfixed toner image formed and carried on the recording material to the recording material. Claims 1 to 3 as said heating means.
An image forming apparatus comprising the heating device according to claim 6.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11191511A JP2001022202A (en) | 1999-07-06 | 1999-07-06 | Heating device and image forming device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11191511A JP2001022202A (en) | 1999-07-06 | 1999-07-06 | Heating device and image forming device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JP2001022202A true JP2001022202A (en) | 2001-01-26 |
Family
ID=16275883
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP11191511A Pending JP2001022202A (en) | 1999-07-06 | 1999-07-06 | Heating device and image forming device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2001022202A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009086033A (en) * | 2007-09-27 | 2009-04-23 | Brother Ind Ltd | Fixing device and image forming device |
-
1999
- 1999-07-06 JP JP11191511A patent/JP2001022202A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009086033A (en) * | 2007-09-27 | 2009-04-23 | Brother Ind Ltd | Fixing device and image forming device |
| US8010030B2 (en) | 2007-09-27 | 2011-08-30 | Brother Kogyo Kabushiki Kaisha | Image forming apparatus roller configuration |
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