JPH0522909B2 - - Google Patents
Info
- Publication number
- JPH0522909B2 JPH0522909B2 JP986782A JP986782A JPH0522909B2 JP H0522909 B2 JPH0522909 B2 JP H0522909B2 JP 986782 A JP986782 A JP 986782A JP 986782 A JP986782 A JP 986782A JP H0522909 B2 JPH0522909 B2 JP H0522909B2
- Authority
- JP
- Japan
- Prior art keywords
- roller
- pressure
- fixing roller
- expansion element
- fixing
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
- 229920001971 elastomer Polymers 0.000 claims description 11
- 239000000463 material Substances 0.000 claims description 7
- 230000031070 response to heat Effects 0.000 claims 1
- 230000007246 mechanism Effects 0.000 description 10
- 238000010438 heat treatment Methods 0.000 description 5
- 238000000926 separation method Methods 0.000 description 5
- AZDRQVAHHNSJOQ-UHFFFAOYSA-N alumane Chemical group [AlH3] AZDRQVAHHNSJOQ-UHFFFAOYSA-N 0.000 description 2
- 239000004809 Teflon Substances 0.000 description 1
- 229920006362 Teflon® Polymers 0.000 description 1
- 230000002159 abnormal effect Effects 0.000 description 1
- 210000000078 claw Anatomy 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 229910052736 halogen Inorganic materials 0.000 description 1
- 150000002367 halogens Chemical class 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 229920002379 silicone rubber Polymers 0.000 description 1
- 239000004945 silicone rubber Substances 0.000 description 1
- BFKJFAAPBSQJPD-UHFFFAOYSA-N tetrafluoroethene Chemical group FC(F)=C(F)F BFKJFAAPBSQJPD-UHFFFAOYSA-N 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Classifications
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
- G03G15/00—Apparatus for electrographic processes using a charge pattern
- G03G15/20—Apparatus for electrographic processes using a charge pattern for fixing, e.g. by using heat
- G03G15/2003—Apparatus for electrographic processes using a charge pattern for fixing, e.g. by using heat using heat
- G03G15/2014—Apparatus for electrographic processes using a charge pattern for fixing, e.g. by using heat using heat using contact heat
- G03G15/2017—Structural details of the fixing unit in general, e.g. cooling means, heat shielding means
- G03G15/2025—Structural details of the fixing unit in general, e.g. cooling means, heat shielding means with special means for lubricating and/or cleaning the fixing unit, e.g. applying offset preventing fluid
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Control Of Resistance Heating (AREA)
- Fixing For Electrophotography (AREA)
Description
【発明の詳細な説明】
本発明は複写機やプリンタ等に用いられる定着
装置に関する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a fixing device used in copying machines, printers, and the like.
従来電子写真画像形成装置の加熱定着装置にお
いては、主として１対の加熱されたローラー間を
未定着のトナーを担持した、トナー像支持体が通
過搬送することにより加熱加圧定着される。とこ
ろが現在使用されているローラー構成にはゴム層
を有するローラの１対からなるもの、テフロン
（デユポン社、商品名）からなる層をもつローラ
ーと、ゴムローラーの組合せからなるもの、又は
剛体ローラーの一対からなるもの等がある。この
様なローラ構成は長時間圧接させておくと極端な
場合、圧接部分の圧縮歪が復元しなくなつたり、
或いは復元に時間がかかる。いずれにしても常時
圧接状態にしておくと定着性に問題が生じ定着不
良や異音等の要因となりやすい。そのため、中に
は着脱機構を設け、定着動作を行なうときのみ、
加圧圧接するようにしたものもあるが、着脱機構
が機械的、電気的に複雑となるため故障の発生す
る確率が高くなるという不都合が生じていた。 In a conventional heat fixing device of an electrophotographic image forming apparatus, a toner image support carrying unfixed toner is mainly conveyed between a pair of heated rollers to fix the toner under heat and pressure. However, the roller configurations currently in use include a pair of rollers with a rubber layer, a combination of a roller with a layer of Teflon (trade name, Dupont) and a rubber roller, or a combination of a rubber roller. There are some that consist of a pair. In extreme cases, if such a roller configuration is left in pressure contact for a long time, the compressive strain in the pressure contact area may no longer recover.
Or it takes time to restore. In any case, if the pressure contact state is maintained at all times, problems may arise in fixing performance, which is likely to cause fixing failures, abnormal noises, and the like. Therefore, we have installed a detachable mechanism inside, and only when performing the fixing operation,
There are some devices that use pressure welding, but the attachment/detachment mechanism is mechanically and electrically complicated, resulting in an inconvenience that the probability of failure is high.
上記問題点を解決する本発明は、
加熱源によつて加熱される定着ローラと、この
定着ローラに対して接離可能な加圧ローラと、前
記定着ローラから発生する熱に応じて膨張及び収
縮するゴム系熱膨張素子と、を有し、記録材に未
定着像を定着する定着装置であつて、
前記加圧ローラは、前記ゴム系熱膨張素子が膨
張することによつて前記定着ローラに接触し、前
記ゴム系熱膨張素子が収縮することによつて前記
定着ローラから離間することを特徴とする。 The present invention, which solves the above problems, includes a fixing roller heated by a heat source, a pressure roller that can move toward and away from the fixing roller, and a pressure roller that expands and contracts in response to the heat generated from the fixing roller. A fixing device that fixes an unfixed image on a recording material, the pressure roller having a rubber thermal expansion element that fixes an unfixed image on a recording material, wherein the pressure roller is fixed to the fixing roller by expanding the rubber thermal expansion element. The rubber-based thermal expansion element contracts and separates from the fixing roller.
以下、図面を参照しながら本発明を説明する。 The present invention will be described below with reference to the drawings.
第１図、第２図は本発明を適用した定着装置の
実施例である。２０はアルミニウム芯金２２上に
４弗化エチレン樹脂２３をコーテイングした定着
ローラーであり、その軸２０1は本体側板に支持
されたベアリング２４を介して回転可能に支持さ
れている。又２１はアルミニウム芯金２５上にシ
リコーンゴム２６を被覆した加圧ローラーであ
る。この加圧ローラーの軸２１1は、ベアリング
２９を介して本体側板（不図示）に固定された支
持軸２７を中心に回動可能なステー２８に固定さ
れている。 FIGS. 1 and 2 show an embodiment of a fixing device to which the present invention is applied. 20 is a fixing roller having an aluminum core bar 22 coated with tetrafluoroethylene resin 23, and its shaft 201 is rotatably supported via a bearing 24 supported on the side plate of the main body. Further, 21 is a pressure roller having an aluminum core 25 coated with silicone rubber 26. The shaft 21 1 of this pressure roller is fixed via a bearing 29 to a stay 28 that is rotatable about a support shaft 27 fixed to a side plate (not shown) of the main body.
さらに、ステー２８の他端は加圧機構３３に連
動しており、この加圧機構は、熱膨張素子３０を
内部に有するシリンダー３１と、このシリンダー
３１の内面で移動可能なピストン３２を有してい
る。そして、この加圧機構３３の熱膨張素子３０
のあたりを取巻くようにヒートパイプ３４を設け
てある。このヒートパイプ３４の他端は、ハロゲ
ンヒーター（不図示）を加熱源として内部に有す
る定着ローラー２０の非通紙領域に密着されてお
り、この定着ローラー２０の無駄又は障害となる
熱を吸収し、加圧機構３３へ熱供給する。つま
り、定着ローラーの加温と同期してローラー間の
加圧がなされるわけである。尚、図中３４′，３
４″で示されている部分はヒートパイプ３４の断
面である。 Further, the other end of the stay 28 is linked to a pressure mechanism 33, and this pressure mechanism includes a cylinder 31 having a thermal expansion element 30 inside, and a piston 32 movable on the inner surface of the cylinder 31. ing. The thermal expansion element 30 of this pressurizing mechanism 33
A heat pipe 34 is provided so as to surround the area. The other end of the heat pipe 34 is in close contact with a non-sheet passing area of the fixing roller 20, which has a halogen heater (not shown) inside as a heat source, and absorbs heat that would be wasted or hinder the fixing roller 20. , heat is supplied to the pressurizing mechanism 33. In other words, the pressure between the rollers is applied in synchronization with the heating of the fixing roller. In addition, 34', 3 in the figure
The portion indicated by 4'' is the cross section of the heat pipe 34.
なお、３５は未定着画像を支持した紙をローラ
ー間へ導く入口ガイドで、３６は定着後の紙（記
録材としての支持材）を案内する排紙ガイドであ
る。３７は分離爪、３８はクリーニング・パツ
ト、３９は温度検知素子で夫々定着ローラー２０
の周面に接触して設けられている。 Note that 35 is an entrance guide that guides the paper supporting the unfixed image between the rollers, and 36 is a paper discharge guide that guides the fixed paper (supporting material as a recording material). 37 is a separation claw, 38 is a cleaning pad, 39 is a temperature detection element, and each fixing roller 20
is provided in contact with the peripheral surface of the
第５図は定着ローラーの加熱源への電圧供給が
オフとされ、定着ローラ２０の温度が180℃位か
ら、25℃になつたときの状態を示している。つま
り、加圧機構３３の内部にある熱膨張素子３０は
その熱を失つて第４図での体積の約1/6倍の体積
となる。従つて、加圧ローラー２１の自重及びス
テー２８の自重等により、ピストン３２が下がつ
て加圧ローラー２１は定着ローラーより脱離さ
れ、ピストン３２が固定支持部３２1に停止する
ことで所定の位置に保持されている。 FIG. 5 shows a state when the voltage supply to the heat source of the fixing roller is turned off and the temperature of the fixing roller 20 increases from about 180° C. to 25° C. In other words, the thermal expansion element 30 inside the pressurizing mechanism 33 loses its heat and becomes approximately 1/6 times the volume in FIG. 4. Therefore, due to the weight of the pressure roller 21 and the stay 28, the piston 32 is lowered and the pressure roller 21 is detached from the fixing roller, and when the piston 32 stops on the fixed support part 321 , a predetermined image is formed. held in position.
なお、当然であるが、加熱源として定着ローラ
ーの熱を利用することなく、単独にヒーターを設
けてもよい。さらにはコピー動作に同期させ、加
熱源の温度を調整等の方法により加圧状態、即ち
定着ローラーに対する加圧ローラーの接離や圧状
態（高圧、軽圧）を変化させても良い。 Note that, as a matter of course, a heater may be provided independently without using the heat of the fixing roller as a heat source. Furthermore, the pressure state, that is, the contact and separation of the pressure roller with respect to the fixing roller, and the pressure state (high pressure, light pressure) may be changed by adjusting the temperature of the heat source in synchronization with the copying operation.
本実施例は加熱定着装置における加熱源の熱を
利用して定着可能温度或いはその近傍の温度で定
着ローラーと加圧ローラーを圧接することを可能
にでき、他の複雑な機構を必要とせず、温度に依
存しているため安全性が高い。又、ジヤム処理等
において冷却されると自然に圧力が減少或いは離
間状態にすることができるので合理的且つ実用的
である。 This embodiment makes it possible to press the fixing roller and the pressure roller at or near the fixing temperature by using the heat of the heat source in the heat fixing device, and does not require any other complicated mechanism. Highly safe as it depends on temperature. Furthermore, when the material is cooled during jamming or the like, the pressure can be naturally reduced or the material can be separated, which is rational and practical.
上記実施例における熱膨張素子は、これに対す
る加熱量やその熱膨張率或いはその大きさ等を任
意に選出することによつて定着ローラと加圧ロー
ラを所望の圧力状態にしたり、加圧ローラを任意
の位置に保持すること等を可能にする。 The thermal expansion element in the above embodiment can bring the fixing roller and pressure roller into a desired pressure state by arbitrarily selecting the amount of heating, its coefficient of thermal expansion, its size, etc. This allows it to be held in any position.
又、本発明は上述した実施例の如く、ある部材
に対して圧接してある機能を奏する部材の少なく
とも一方が弾性変形できるものである場合に、予
め定めた圧力等とそれと異なる圧力状態又は離間
状態を必要とする例において特に有効である。又
上記実施例では一方の定着ローラーを固定とし、
他方の加圧ローラーを移動型としたが、逆でも又
両方移動型にして各ローラーの移動量を小さくし
ても良い実施例となる。 Furthermore, as in the above-described embodiment, when at least one of the members that performs a certain function is in pressure contact with a certain member and can be elastically deformed, the present invention can be applied to a predetermined pressure or the like and a different pressure state or separation. This is particularly useful in cases that require state. Further, in the above embodiment, one of the fixing rollers is fixed,
Although the other pressure roller is of the movable type, this embodiment may be reversed or both may be of the movable type to reduce the amount of movement of each roller.
また、本発明は熱膨張素子としてゴム系熱膨張
素子を用いた。ゴム系熱膨張素子は金属等に比べ
熱膨張率が大きいので少量用いればよく、ゆえ
に、装置の小型化が達成できる。この熱膨張素子
に対する加熱には通常の加熱手段とその温度制御
手段等を設け、所望温度の時に体積変化を生じせ
しめても良いが、加熱定着ローラのようにそれ自
体に加熱手段を有する部材からの熱を利用するこ
とがより好ましい。 Further, in the present invention, a rubber-based thermal expansion element is used as the thermal expansion element. Since the rubber-based thermal expansion element has a higher coefficient of thermal expansion than metals, it is sufficient to use a small amount, and therefore, the device can be made smaller. For heating this thermal expansion element, a normal heating means and its temperature control means may be provided, and the volume change may be caused when the desired temperature is reached. It is more preferable to use the heat of
又、本発明は画像形成装置に適用することが特
に好ましいものであり、さらに加熱手段を有する
装置においては格別である。 Further, the present invention is particularly preferably applied to an image forming apparatus, and is particularly applicable to an apparatus having a heating means.
上記各実施例のような体積変化の大きな、しか
も安定した熱膨張素子を利用した着脱機構を用い
ることにより、従来のような、プランジヤーや、
偏心カムを用いた着脱機構における電気的、機械
的に生じる故障が比較的高い確率であつたのに対
し、熱による状態変化を示している本例では温度
依存性の高い膨張素子を用いたものであるので非
常に安定しており、故障も少なく、かつコスト的
にも安価なものを提供できる。さらには小さなス
ペースにも組み込めることからその利点は大き
い。さらに、熱源を有する機械に用いる場合その
熱を駆動源に使えることから省資源にもなる。 By using an attachment/detachment mechanism that utilizes a stable thermal expansion element with a large volume change as in each of the above embodiments, it is possible to
While there was a relatively high probability of electrical and mechanical failures in attachment/detachment mechanisms using eccentric cams, this example, which shows state changes due to heat, uses an expansion element with high temperature dependence. Therefore, it is extremely stable, has few failures, and can be provided at low cost. Furthermore, it has a great advantage because it can be installed in a small space. Furthermore, when used in a machine that has a heat source, the heat can be used as a driving source, resulting in resource savings.
以上の説明から明らかなように、本発明は、熱
に応じて状態が変化する部材を用いることによつ
て２つ以上の状態（圧接又は離間、異なる圧接力
状態で圧接するもの、離間或いはある部材に対す
る相対位置を２つ以上有するもの等）を安全且つ
確実に保持することを可能にするものである。 As is clear from the above description, the present invention uses a member whose state changes depending on heat, so that two or more states (press contact or separation, pressure contact with different pressure contact states, separation or This makes it possible to safely and reliably hold objects (such as objects that have two or more relative positions with respect to a member, etc.).
第１図は本発明の実施例で、定着ローラと加圧
ローラが圧接した状態を示した図、第２図は定着
ローラと加圧ローラが離間した状態を示した図で
ある。
２０は定着ローラ、２１は加圧ローラ、３０は
熱膨張素子、３４はヒートパイプ。
FIG. 1 shows an embodiment of the present invention, showing a state in which a fixing roller and a pressure roller are in pressure contact, and FIG. 2 shows a state in which a fixing roller and a pressure roller are separated. 20 is a fixing roller, 21 is a pressure roller, 30 is a thermal expansion element, and 34 is a heat pipe.
Claims (1)
の定着ローラに対して接離可能な加圧ローラと、
前記定着ローラから発生する熱に応じて膨張及び
収縮するゴム系熱膨張素子と、を有し、記録材に
未定着像を定着する定着装置であつて、 前記加圧ローラは、前記ゴム系熱膨張素子が膨
張することによつて前記定着ローラに接触し、前
記ゴム系熱膨張素子が収縮することによつて前記
定着ローラから離間することを特徴とする定着装
置。[Scope of Claims] 1. A fixing roller heated by a heat source, a pressure roller that can come into contact with and separate from the fixing roller,
The fixing device has a rubber-based thermal expansion element that expands and contracts in response to heat generated from the fixing roller, and fixes an unfixed image to a recording material, wherein the pressure roller is configured to expand and contract according to the heat generated from the rubber-based heat. A fixing device characterized in that the expansion element contacts the fixing roller when the expansion element expands, and separates from the fixing roller when the rubber-based thermal expansion element contracts.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP986782A JPS58126558A (en) | 1982-01-25 | 1982-01-25 | Fusing device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP986782A JPS58126558A (en) | 1982-01-25 | 1982-01-25 | Fusing device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS58126558A JPS58126558A (en) | 1983-07-28 |
| JPH0522909B2 true JPH0522909B2 (en) | 1993-03-31 |
Family
ID=11732083
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP986782A Granted JPS58126558A (en) | 1982-01-25 | 1982-01-25 | Fusing device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS58126558A (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0812526B2 (en) * | 1985-02-20 | 1996-02-07 | オリンパス光学工業株式会社 | Roller pressure contact mechanism of image forming device |
-
1982
- 1982-01-25 JP JP986782A patent/JPS58126558A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS58126558A (en) | 1983-07-28 |
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