JPH03139682A - Fixing device - Google Patents
Fixing deviceInfo
- Publication number
- JPH03139682A JPH03139682A JP1277117A JP27711789A JPH03139682A JP H03139682 A JPH03139682 A JP H03139682A JP 1277117 A JP1277117 A JP 1277117A JP 27711789 A JP27711789 A JP 27711789A JP H03139682 A JPH03139682 A JP H03139682A
- Authority
- JP
- Japan
- Prior art keywords
- heating roller
- temperature
- fixing device
- heat roller
- roller
- 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
- 238000001816 cooling Methods 0.000 claims abstract description 17
- 238000010438 heat treatment Methods 0.000 claims description 89
- 238000001514 detection method Methods 0.000 description 12
- 238000004140 cleaning Methods 0.000 description 6
- 230000007423 decrease Effects 0.000 description 4
- 229910052751 metal Inorganic materials 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- 239000011347 resin Substances 0.000 description 3
- 229920005989 resin Polymers 0.000 description 3
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 2
- 229910052782 aluminium Inorganic materials 0.000 description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 2
- 229910052802 copper Inorganic materials 0.000 description 2
- 239000010949 copper Substances 0.000 description 2
- NBVXSUQYWXRMNV-UHFFFAOYSA-N fluoromethane Chemical compound FC NBVXSUQYWXRMNV-UHFFFAOYSA-N 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000002093 peripheral effect Effects 0.000 description 2
- 229920002379 silicone rubber Polymers 0.000 description 2
- 239000004945 silicone rubber Substances 0.000 description 2
- 229910001220 stainless steel Inorganic materials 0.000 description 2
- 239000010935 stainless steel Substances 0.000 description 2
- 239000004962 Polyamide-imide Substances 0.000 description 1
- 239000003054 catalyst Substances 0.000 description 1
- 125000000118 dimethyl group Chemical group [H]C([H])([H])* 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 229920001971 elastomer Polymers 0.000 description 1
- 229910052736 halogen Inorganic materials 0.000 description 1
- 150000002367 halogens Chemical class 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 239000004745 nonwoven fabric Substances 0.000 description 1
- 229920002312 polyamide-imide Polymers 0.000 description 1
- 239000004810 polytetrafluoroethylene Substances 0.000 description 1
- 229920001343 polytetrafluoroethylene Polymers 0.000 description 1
- 229920002545 silicone oil Polymers 0.000 description 1
Landscapes
- Fixing For Electrophotography (AREA)
- Control Or Security For Electrophotography (AREA)
Abstract
Description
【発明の詳細な説明】
（産業上の利用分野）
本発明は複写機やレーザプリンタの如き電子写真方式を
採用する画像形成装置の定着装置に関する。DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a fixing device for an image forming apparatus employing an electrophotographic method, such as a copying machine or a laser printer.
（従来の技術）
複写機等においては像担持体である感光ドラム上にトナ
ー像が形成されると、該トナー像は転写紙上に転写され
る。そしてトナー像を担持する転写紙は定着装置に送ら
れ、該定着装置によりそのトナー像が永久像として転写
紙上に固着定着される。(Prior Art) In a copying machine or the like, when a toner image is formed on a photosensitive drum, which is an image carrier, the toner image is transferred onto a transfer paper. Then, the transfer paper carrying the toner image is sent to a fixing device, and the toner image is firmly fixed onto the transfer paper as a permanent image by the fixing device.
この種の定着装置としては、少なくとも一方が加熱ロー
ラとなった一対の定着ローラ間にトナー像を相持する転
写紙を挟持搬送させつつ、該転写紙上のトナー像を加熱
ローラにより加熱溶融して転写紙上に固着させる加熱方
式の定着装置が多く使用されている。かかる定着装置の
加熱ローラ内には電気ヒータ等の熱源か該加熱ローラの
軸方向に内装されており、電源の供給とともに加熱ロー
ラの表面温度は急速に加熱される。また加熱ローラの外
表面には温度検知素子か取り付けられ、該温度検知素子
により加熱ローラの外表面温度か検知されて、該温度か
常に定着に適した所定温度になるように熱源への電源供
給量かコントロールされている。In this type of fixing device, a transfer paper carrying a toner image is conveyed between a pair of fixing rollers, at least one of which is a heating roller, and the toner image on the transfer paper is heated and melted by the heating roller and transferred. A heating type fixing device that fixes the paper onto the paper is often used. A heat source such as an electric heater is installed in the heating roller of such a fixing device in the axial direction of the heating roller, and the surface temperature of the heating roller is rapidly heated as power is supplied. In addition, a temperature detection element is attached to the outer surface of the heating roller, and the temperature detection element detects the temperature of the outer surface of the heating roller, and supplies power to the heat source so that the temperature is always at a predetermined temperature suitable for fixing. quantity is controlled.
ここで加熱ローラは転写紙に対してトナー像の定着を行
なえば、その分熱を奪われて冷されるため前記温度検知
素子は加熱ローラの転写紙通紙部に配設されている。Here, when the heating roller fixes the toner image on the transfer paper, the temperature sensing element is disposed at the transfer paper passing portion of the heating roller because the heat is taken away and cooled accordingly.
（発明か解決しようとする課題）
しかしながら、以上の如き定着装置では、転写紙の最大
寸法に合せて加熱ローラの大きさが定められているため
、小サイズの転写紙を連続的に定着処理すれば、転写紙
を介して熱か放出される部分と、転写紙による熱の放出
の無い部分とて温度差か生じていまう。即ち、加熱ロー
ラの転写紙による熱の放出部分（通紙部分）の温度を温
度検知素子を介して常に一定値に保持しようとすれば、
加熱ローラの定着の行われていない部分の温度か高温化
し、安全性り問題があるし、高熱による定着装置内の部
品の寿命を縮めるといった問題かあった。(Problem to be Solved by the Invention) However, in the above-described fixing device, the size of the heating roller is determined according to the maximum size of the transfer paper, so it is difficult to continuously fix small-sized transfer paper. For example, a temperature difference occurs between a portion where heat is emitted through the transfer paper and a portion where heat is not emitted by the transfer paper. In other words, if you try to keep the temperature of the heat roller's heat emitting part (paper passing part) by the transfer paper at a constant value through the temperature detection element,
The temperature of the part of the heating roller that is not being fixed increases, which poses a safety problem, and the high heat shortens the lifespan of parts within the fixing device.
尚、温度検知素子を加熱ローラの端部側のほとんど定着
作業のなされない部分に取付けるといった考えもあるか
、かかる場合常時定着作業かなされる加熱ローラの中間
部の温度か下かり、転写紙へのトナー像の定着が十分に
なされないといった問題が生じる。Is there any idea to attach a temperature detection element to the end of the heating roller where fixing work is rarely done? A problem arises in that the toner image is not sufficiently fixed.
本発明は上記問題に鑑みてなされたもので、その目的と
する処は、通紙サイズの如何にかかわらす、常に加熱ロ
ーラの軸方向温度分布を均一に保持てきる定着装置を提
供するにある。The present invention has been made in view of the above problems, and an object thereof is to provide a fixing device that can always maintain a uniform temperature distribution in the axial direction of the heating roller, regardless of the paper size. .
（課題を解決するための手段）
上記目的を達成すべく本発明は、少なくとも一方か内部
に熱源を有して加熱ローラとなった一対の定着ローラと
、該定着ローラの周囲を覆うケーシングと、前記加熱ロ
ーラの外表面温度を一定値に保持するための制御手段と
を有する定着装置において、前記ケーシングの外側に、
加熱ローラ回りに空気流を生じさせる空冷手段を設け、
該空冷手段による空気流の量を加熱ローラの軸方向に対
して可変可能としたことを特徴とする。(Means for Solving the Problems) In order to achieve the above object, the present invention includes a pair of fixing rollers, at least one of which has a heat source therein to serve as a heating roller, and a casing surrounding the fixing rollers. In the fixing device, the fixing device includes a control means for maintaining the outer surface temperature of the heating roller at a constant value, on the outside of the casing,
An air cooling means is provided to create an air flow around the heating roller.
The heating roller is characterized in that the amount of air flow by the air cooling means can be varied in the axial direction of the heating roller.
（作用）
定着ローラにより転写紙上のトナー像の定着をすれば、
加熱ローラの外表面温度は低下する。このため制御手段
を介して加熱ローラ内の熱源のコントロールを行い加熱
ローラの外表面温度を一定値に保持するようにしている
。(Function) If the toner image on the transfer paper is fixed by the fixing roller,
The outer surface temperature of the heating roller decreases. For this reason, the heat source within the heating roller is controlled via a control means to maintain the outer surface temperature of the heating roller at a constant value.
しかしこの場合加熱ローラの転写紙に接触しない部分で
は、温度降下が生じないため、加熱ローラ内の熱源によ
って過剰加熱か生し、過剰な高温状態となる。However, in this case, the temperature does not drop in the portion of the heating roller that does not come into contact with the transfer paper, so the heat source inside the heating roller causes excessive heating, resulting in an excessively high temperature state.
そこで加熱ローラ回りに空気流を生しさせるファン等の
空冷手段により、加熱ローラの過剰な加熱部分に空気流
を発生させ、この加熱ローラを冷却することとした。Therefore, it was decided to cool the heating roller by generating an airflow in the excessively heated portion of the heating roller using an air cooling means such as a fan that generates an airflow around the heating roller.
（実施例） 以下に本発明の実施例を添付図面に基づいて説明する。(Example) Embodiments of the present invention will be described below based on the accompanying drawings.
先ず本発明の第１実施例を第１図及び第２図により説明
する。First, a first embodiment of the present invention will be described with reference to FIGS. 1 and 2.
第１図はレーザプリンタ等の画像形成装置の定着装置及
び感光ドラム周りの断面図であり、図中１０は像担持体
である感光ドラムであり、該感光ドラムｌＯの周りには
不図示の一次帯電器、現像器、クリーニング器、スキャ
ナユニットや転写帯電器１１が配設され、これ等の画像
形成部の左方には中間ガイド１２、定着装置２０、排紙
ローラ１３等か配設されている。FIG. 1 is a sectional view of the fixing device and the photosensitive drum surroundings of an image forming apparatus such as a laser printer. In the figure, 10 is a photosensitive drum which is an image bearing member. A charger, a developing device, a cleaning device, a scanner unit, and a transfer charger 11 are arranged, and an intermediate guide 12, a fixing device 20, a paper ejection roller 13, etc. are arranged to the left of these image forming sections. There is.
即ち、−成帯電器によって一様帯電された感光ドラムｌ
Ｏにスキャナユニットからの画像光か露光されると、感
光ドラム１０上には静電潜像が形成される。該静電潜像
は現像器により顕像化されトナー像に変えられ、該トナ
ー像は転写帯電器１１を介して転写紙Ｐ上に転写される
。一方転写紙Ｐは不図示の給紙カセット等からタイミン
クを合されて感光ドラム１０の方へ搬送され、転写が終
了すれば、中間ガイド１２を介して定着装置２０に送ら
れて、そのトナー像の定着か行なわれる。そして定着が
終了すると転写紙Ｐは排紙ローラ１３によって装置本体
外に排出される。尚、転写の終了した感光ドラム１０は
クリーニング器によりその残留トナーがクリーニングさ
れ、次の画像形成作業に備えられる。That is, a photosensitive drum l uniformly charged by a charger
When the photosensitive drum 10 is exposed to image light from the scanner unit, an electrostatic latent image is formed on the photosensitive drum 10. The electrostatic latent image is visualized by a developer and converted into a toner image, and the toner image is transferred onto the transfer paper P via the transfer charger 11. On the other hand, the transfer paper P is timed and conveyed toward the photosensitive drum 10 from a paper feed cassette (not shown), and when the transfer is completed, it is sent to the fixing device 20 via the intermediate guide 12, and the toner image is The fixation is done. When the fixing is completed, the transfer paper P is discharged from the main body of the apparatus by the paper discharge roller 13. Incidentally, the photosensitive drum 10 after the transfer is cleaned of residual toner by a cleaning device, and is prepared for the next image forming operation.
定着装置２０は」二下一対の定着ローラである加熱ロー
ラ２１及び加圧ローラ２２、該加熱、加圧ローラ２１，
２２をそれぞれ上丁方向から覆う」二、ｆケーシング２
３，２４、加熱ローラ２１の外表面温度を検知する温度
検知手段２５、加熱ローラ２１の外表面をクリーニンク
するクリーニング部材２６等とから構成されている。The fixing device 20 includes a pair of fixing rollers, a heating roller 21 and a pressure roller 22;
22 respectively from the top direction" 2, f casing 2
3, 24, a temperature detection means 25 for detecting the outer surface temperature of the heating roller 21, a cleaning member 26 for cleaning the outer surface of the heating roller 21, and the like.
加熱ローラ２１は、その外周面に樹脂層２１ａかコーチ
インクされた中空円筒状のローラ芯金２１ｂ内にハロゲ
ンケータ等からなる加熱源２１ｃか内装されらものてあ
り、不図示の駆動源により一定方向に回転駆動されるも
のである。前記加熱源２１ｃはローラ芯金２１ｂの軸方
向に亘って設けられており、加熱ローラ２１の軸方向の
外表面温度を均一に加熱てきるようになっている。尚、
ローラ芯金２１ｂはアルミニウム、ステンレス、銅等の
材料から構成され、樹脂層２１ａは３〜１１００ＩＬの
厚さの耐熱性、離型性を有するＰＦＡ、ＰＴＦＥ等から
構成されている。The heating roller 21 has a heating source 21c made of a halogen catalyst or the like housed inside a hollow cylindrical roller core 21b having a resin layer 21a or coach ink coated on its outer peripheral surface, and is kept constant by a driving source (not shown). It is driven to rotate in the direction. The heating source 21c is provided along the axial direction of the roller core metal 21b, and is configured to uniformly heat the outer surface temperature of the heating roller 21 in the axial direction. still,
The roller core metal 21b is made of a material such as aluminum, stainless steel, or copper, and the resin layer 21a is made of PFA, PTFE, or the like having a thickness of 3 to 1100 IL and having heat resistance and mold releasability.
加圧ローラ２２は、その外周面に耐熱弾性体層２２ａか
取り付けられたローラ芯金２２ｂ等からなるもので、不
図示の加圧手段によって加熱ローラ２１に押圧されると
共に、不図示の駆動源により一定方向に回転駆動される
。ローラ芯金２２ｂは加熱ローラ２１と同様にアルミニ
ウム、ステンレス、銅等の材料から構成され、＃熱弾性
体層２２ａは２〜１０ｍｍの厚さのシリコンゴム、フッ
素ゴム、フロンシリコンゴム等から構成されていて、こ
の耐熱弾性体層２２ａにより加熱ローラ２１との間に定
着用のニップ部から形成される。尚、耐熱弾性体層２２
ａの外表面に３〜１００ ＩＬｍの厚さのＰＦＡ、ＰＴ
ＦＥ等からなる耐熱性、剥離性を有する樹脂層を設けた
ものがより好ましい。The pressure roller 22 is composed of a roller core 22b and the like having a heat-resistant elastic layer 22a attached to its outer peripheral surface, and is pressed against the heating roller 21 by a pressure means (not shown) and driven by a drive source (not shown). Rotationally driven in a fixed direction. The roller core metal 22b is made of materials such as aluminum, stainless steel, and copper like the heating roller 21, and the thermoelastic layer 22a is made of silicone rubber, fluorocarbon rubber, fluorocarbon silicone rubber, etc. with a thickness of 2 to 10 mm. The heat-resistant elastic layer 22a forms a fixing nip between the heat roller 21 and the heat-resistant elastic layer 22a. In addition, the heat-resistant elastic layer 22
PFA, PT with a thickness of 3 to 100 ILm on the outer surface of a
It is more preferable to use a heat-resistant and peelable resin layer made of FE or the like.
温度検知手段２５は加熱ローラ２１に接触して配設され
るサーミスタ、熱電対等からなるもので、この温度検知
手段２５により加熱ローラ２１の外表面温度に関する検
出信号を不図示の制御手段に送り、該制御手段により加
熱ローラ２１の加熱源２１ｃをコントロールして、加熱
ローラ２１の外表面温度をトナー像の定着温度に一定保
持させるようにしている。尚、この温度検知手段２５は
加熱ローラ２１の転写紙Ｐのサイズにかかわらず常に定
着作業かなされる位置に取り付けられる。The temperature detection means 25 is composed of a thermistor, thermocouple, etc. disposed in contact with the heating roller 21, and the temperature detection means 25 sends a detection signal regarding the outer surface temperature of the heating roller 21 to a control means (not shown). The control means controls the heat source 21c of the heating roller 21 so that the outer surface temperature of the heating roller 21 is kept constant at the toner image fixing temperature. The temperature detection means 25 is attached to the heating roller 21 at a position where the fixing operation is always performed regardless of the size of the transfer paper P.
クリーニング部材２６はポリアミドイミド、ボエステル
等の耐熱不織布にジメチルシリコンオイル等のオフセッ
ト防止液を含浸させたものてあり、加熱ローラ２１の外
表面に付着したオフセットトナーや紙粉等の異物なロー
ラ表面から除去するためのものである。The cleaning member 26 is made of a heat-resistant non-woven fabric made of polyamide-imide, Boester, etc. impregnated with an anti-offset liquid such as dimethyl silicone oil, and cleans foreign matter such as offset toner and paper dust attached to the outer surface of the heating roller 21 from the roller surface. It is for removal.
上、下ケーシング２３，２４はその断面が（コ）の字形
形状をしたものて、上ケーシング２３は加熱ローラ２１
、温度検知手段２５、クリーニング部材２６等を上方か
ら包み込む如く配設され、下ケーシング２４は加圧ロー
ラ２２等を下方から包み込む如く配設されて、上、下ケ
ーシング２３．２４間に転写紙Ｐの搬送路が形成されて
いる。尚、クリーニング部材２６は上ケーシング２３中
を貫通している。The upper and lower casings 23 and 24 have a U-shaped cross section, and the upper casing 23 has a heating roller 21.
The lower casing 24 is arranged so as to enclose the pressure roller 22 and the like from below, and the transfer paper P is placed between the upper and lower casings 23 and 24. A transport path is formed. Note that the cleaning member 26 penetrates through the upper casing 23.
かくして、第１図中」二向きにトナー像か形成された状
態で転写紙Ｐか定着装置２０に搬入されると、転写紙Ｐ
は加熱、加圧ローラ２１，２２のニップ部間に挟着され
つつ搬送されるか、転写紙Ｐ上のトナー像は加熱ローラ
２１により加熱溶融されて転写紙Ｐ上に固着される。こ
こて加熱ローラ２１の転写紙Ｐを挟着する部分は定着作
業により温度か下降するか、該温度降下は温度検知手段
２５により検知され、制御手段を介して加熱源２１ｃか
コントロールされるため、直ちに回復されることとなる
。Thus, when the transfer paper P is carried into the fixing device 20 with toner images formed in two directions in FIG. 1, the transfer paper P
The toner image on the transfer paper P is heated and conveyed while being sandwiched between the nip portion of the pressure rollers 21 and 22, or the toner image on the transfer paper P is heated and melted by the heating roller 21 and fixed onto the transfer paper P. Here, the temperature of the portion of the heating roller 21 that pinches the transfer paper P decreases due to the fixing operation, and the temperature drop is detected by the temperature detection means 25, and the heating source 21c is controlled via the control means. He will be immediately recovered.
さて、加熱ローラ２１の定着による温度下降は温度検知
手段２５を介して検知され、加熱源２１ｃのヒートアッ
プにより回復されるか、この場合加熱ローラ２１の定着
に関与しない部分、即ち転写紙Ｐか通過しない部分ては
定着作業が行なわれないため、加熱ローラ２１の温度は
降下せず前記加熱源２１ｃのヒートアップにより所定の
定着温度以上に過剰加熱されることとなる。Now, the temperature drop due to the fixing of the heating roller 21 is detected via the temperature detection means 25, and is recovered by heating up the heat source 21c, or in this case, the temperature drop due to the fixing of the heating roller 21 is detected by the portion of the heating roller 21 that is not involved in fixing, that is, the transfer paper P. Since the fixing operation is not performed on the portions where the light does not pass, the temperature of the heating roller 21 does not decrease and is excessively heated to a predetermined fixing temperature or higher due to heating up of the heat source 21c.
そこて、本実施例ては画像形成装置の装置本体内に空冷
用の排熱ファン３０を設け、且つ該排熱ファン３０の吸
引部近傍の定着装置２０の上ケーシング２３に加熱ロー
ラ２１の軸方向に複数の風路窓３１．・・・を設けて、
該風路窓３１．・・・の開度を調整することにより、加
熱ローラ２１の加熱源２１ｃによって加熱過剰となった
部分近傍に排熱ファン３０による空気流を生じさせて、
加熱ローラ２１を部分的に冷却するようにした。Therefore, in this embodiment, a heat exhaust fan 30 for air cooling is provided in the main body of the image forming apparatus, and the shaft of the heating roller 21 is attached to the upper casing 23 of the fixing device 20 near the suction section of the heat exhaust fan 30. A plurality of air passage windows 31. ...and...
The air passage window 31. By adjusting the opening degree of..., an air flow is generated by the heat exhaust fan 30 near the portion that is overheated by the heat source 21c of the heating roller 21,
The heating roller 21 is partially cooled.
即ち第１図て示される如く、排紙ローラ１３上方の装置
本体の外側壁ｌと定着装置２０の上ケーシング２３間に
排熱ファン３０を設け、前記外側壁１に排風可能なルー
パー２を設けると共に、上ケーシング２３に加熱ローラ
２１の軸方向に沿って複数の風路窓３１．・・・を設け
た。該風路窓３１の上ケーシング２３内側にはこの風路
窓３１を覆い排熱ファン３０による吸引空気流の流れを
遮断する風路調整板３２を配設すると共に、該風路調整
板３２を第２図（ａ）で示される如く、バイメタル３３
で上ケーシング２３に支持させるようにした。That is, as shown in FIG. 1, a heat exhaust fan 30 is provided between the outer wall l of the main body of the apparatus above the paper ejection roller 13 and the upper casing 23 of the fixing device 20, and a looper 2 capable of discharging air is provided on the outer wall 1. In addition, a plurality of air passage windows 31. are provided in the upper casing 23 along the axial direction of the heating roller 21. ... has been established. An air passage adjustment plate 32 is disposed inside the upper casing 23 of the air passage window 31 to cover the air passage window 31 and block the flow of suction air by the heat exhaust fan 30. As shown in FIG. 2(a), the bimetal 33
so that it is supported by the upper casing 23.
而して、定着作業の結果加熱ローラ２１にその１
軸方向の一部に過剰高温部か発生してくると、該過剰高
温部周りの空気温度等が上昇するため、その近傍の風路
調整板３２を支持するバイメタル３３の温度も上昇する
。このためバイメタル３３が一定温度以上になると、該
バイメタル３３か傾斜し、第２図（ｂ）で示される如く
、風路調整板３２を上グーシンク２３内面の沿って所定
量だけ移動させることとなる。このため風路窓３１の開
口部を介して、排熱ファン３０により加熱ローラ２１周
りに空気流か生じ、該空気流により加熱ローラ２１の過
剰高温部は冷却される。また、加熱ローラ２１の過剰高
温部がこの排熱ファン３０の空気流により所定温度まて
冷却されてくると、バイメタル３３の温度も降下し、該
バイメタル３３は元の位置に復帰し、風路窓３１は風路
調整板３２で覆われることとなる。As a result of the fixing work, if an excessively high temperature area is generated in a part of the heating roller 21 in the 1st axis direction, the air temperature etc. around the excessively high temperature area will rise, so it is necessary to adjust the air passage in the vicinity. The temperature of the bimetal 33 supporting the plate 32 also rises. Therefore, when the temperature of the bimetal 33 rises above a certain level, the bimetal 33 tilts, and as shown in FIG. . Therefore, an airflow is generated around the heating roller 21 by the heat exhaust fan 30 through the opening of the air passage window 31, and the excessively high temperature portion of the heating roller 21 is cooled by the airflow. Further, when the excessively high temperature part of the heating roller 21 is cooled down to a predetermined temperature by the air flow of the heat exhaust fan 30, the temperature of the bimetal 33 also decreases, the bimetal 33 returns to its original position, and the air path The window 31 will be covered with an air path adjustment plate 32.
以上の如く加熱ローラ２１の軸方向に定着によて熱の吸
収かない過剰高温部か発生しても、該過剰高温部局りに
排熱ファン３０による空気流を生じさせてこの過剰高温
部を冷却するようにしてい ２
るため、常に加熱ローラ２１の軸方向温度分布を均一に
保持することができる。As described above, even if an excessively high temperature area occurs in the axial direction of the heating roller 21 where heat is not absorbed by fixing, the heat exhaust fan 30 generates an air flow around the excessively high temperature area to cool the excessively high temperature area. Therefore, the axial temperature distribution of the heating roller 21 can always be kept uniform.
次に本発明の第２実施例を第３図及び第４図により説明
する。尚、第１実施例に係るものと同一機能を有するも
のについては同一符号を付しその説明を省略する。Next, a second embodiment of the present invention will be described with reference to FIGS. 3 and 4. Components having the same functions as those in the first embodiment are designated by the same reference numerals, and their explanations will be omitted.
本実施例ては上ケーシング２３の一部を加熱ローラ２１
に沿った円弧状ケーシング２３ａとし、該円弧状ケーシ
ング２３ａの上、下側端部２３ｂ、２３ｃを装置本体の
側壁ｌのルーパー２まで延長して排風通路４０を形成し
ている。モしてルーパー２の直前に排熱ファン３０を設
けると共に、加熱ローラ２１の両端部近傍の円弧状ケー
シング２３ａに加熱ローラ２１の軸方向に複数のスリッ
ト４１．・・・を設けた。また円弧状ケーシング２３ａ
のスリット４１．・・・近傍の加熱ローラ１２の外表面
近傍には温度検知器４２を近接して取付け、該温度検知
器４２が過剰高温を検知すれば、排熱ファン３０を作動
てきるようにしている。In this embodiment, a part of the upper casing 23 is attached to the heating roller 21.
The upper and lower ends 23b and 23c of the arcuate casing 23a are extended to the looper 2 of the side wall l of the device main body to form an exhaust passage 40. In addition, a heat exhaust fan 30 is provided immediately before the looper 2, and a plurality of slits 41. ... has been established. Also, the arc-shaped casing 23a
slit 41. ... A temperature sensor 42 is attached close to the outer surface of the nearby heating roller 12, and if the temperature sensor 42 detects an excessively high temperature, the heat exhaust fan 30 is activated.
而して、この定着装置２０によって小サイズの転写紙Ｐ
に対する定着作業が連続して行なわれると、この転写紙
Ｐは加熱ローラ２１の略中央部を通過するため、加熱ロ
ーラ２１の両端部側の温度か順次高温になってくる。そ
こて加熱ローラ２１の両端部側の雰囲気温度を温度検知
器４２により検知し、この温度か所定値以上になれば排
熱ファン３０を作動させる。該排熱ファ３０の作動によ
り、加熱ローラ２１の両端部にはスリット４１゜・・・
を介して空気流か生じ、加熱ローラ２１の両端部は冷却
される。そして加熱ローラ２１の両端部の雰囲気温度が
所定値以下に下がれば、温度検知器４２を介して排熱フ
ァン３０の作動は停止される。This fixing device 20 allows the small-sized transfer paper P to be
When the fixing operation is performed continuously, the transfer paper P passes through the approximate center of the heating roller 21, so that the temperature at both ends of the heating roller 21 gradually becomes higher. Therefore, the temperature detector 42 detects the ambient temperature at both ends of the heating roller 21, and when this temperature exceeds a predetermined value, the heat exhaust fan 30 is activated. Due to the operation of the heat exhaust fan 30, slits 41° are formed at both ends of the heating roller 21.
An air flow is generated through the heating roller 21, and both ends of the heating roller 21 are cooled. When the ambient temperature at both ends of the heating roller 21 falls below a predetermined value, the operation of the heat exhaust fan 30 is stopped via the temperature detector 42.
かくして、本実施例においても第１実施例と同様に加熱
ローラ２１の軸方向温度分布を均一に保持てきることと
なる。Thus, in this embodiment as well, the axial temperature distribution of the heating roller 21 can be maintained uniformly as in the first embodiment.
次に本発明の第３実施例を第５図により説明する。尚、
第１実施例に係るものと同一機能を有するものについて
は同一符号を付しその説明を省略する。Next, a third embodiment of the present invention will be described with reference to FIG. still,
Components having the same functions as those in the first embodiment are given the same reference numerals, and their explanations will be omitted.
本実施例ては排紙ローラ１３下方の装置本体の側壁１の
一部１ａを排紙ローラ１３の給紙側まて延長し、その一
端部１ｂを排紙ローラ１３の転写紙ガイドとすると共に
、定着装置２０の下ケーシング２４の一部２４ａを加熱
、加圧ローラ２１゜２２の排紙部側まで延長し、この装
置本体の側壁ｌと下ケーシング２４間に送風路５０を形
成した。そして該送風路５０内に冷却ファン５１を取付
け、且つ該冷却ファン５１による空気流か加熱ローラ２
１の方へ十分移動できるように上ケーシング２３の一部
をカットした。In this embodiment, a part 1a of the side wall 1 of the apparatus main body below the paper ejection roller 13 is extended to the paper feed side of the paper ejection roller 13, and one end 1b thereof is used as a transfer paper guide for the paper ejection roller 13. A part 24a of the lower casing 24 of the fixing device 20 was heated and extended to the paper discharge section side of the pressure rollers 21 and 22, and an air passage 50 was formed between the side wall l of the device main body and the lower casing 24. A cooling fan 51 is installed in the air passage 50, and the airflow caused by the cooling fan 51 is connected to the heating roller 2.
A part of the upper casing 23 was cut so that it could be moved sufficiently toward the upper casing 23.
而して、加熱、加圧ローラ２１，２２間に転写紙Ｐか挟
着されていれば、送風路５０を通った冷却ファン５１に
よる空気流は転写紙Ｐを避け、該転写紙Ｐの両端部側か
ら加熱ローラ２１を通ってルーバー２の方へ移動する。Therefore, if the transfer paper P is sandwiched between the heating and pressure rollers 21 and 22, the airflow by the cooling fan 51 that has passed through the air passage 50 will avoid the transfer paper P and will cause the transfer paper P to reach both ends of the transfer paper P. It moves from the side toward the louver 2 through the heating roller 21.
このため、転写紙Ｐの通過がなく、高温化されつつある
加熱ローラ２１の両端部側は、冷却ファン５１による空
気流により十分に冷却され、加熱ローラ２１の軸方向
５
温度は常に均一に保持されることとなる。Therefore, both ends of the heating roller 21 , which are becoming hotter due to the passage of the transfer paper P, are sufficiently cooled by the air flow generated by the cooling fan 51 , and are cooled in the axial direction of the heating roller 21 .
5. The temperature will always be maintained uniformly.
本実施例においては転写紙Ｐのサイズかいかなるもので
あっても、そのサイズに合せて空気流を加熱ローラ２１
の方に送ることかでき、他の実施例に比べ、加熱ローラ
２１の必要部分の冷却かより完全になせるため、加熱ロ
ーラ２１の軸方向温度分布をより均一になすことができ
る。尚、定着装置２０により定着作業を行なっていない
場合は冷却ファン５１は停止していてもよい。In this embodiment, no matter what size the transfer paper P is, the air flow is directed to the heating roller 21 according to the size of the transfer paper P.
Since the necessary portions of the heating roller 21 can be cooled more completely than in other embodiments, the temperature distribution in the axial direction of the heating roller 21 can be made more uniform. Note that when the fixing device 20 is not performing fixing work, the cooling fan 51 may be stopped.
（発明の効果）
以上の説明で明らかな如く本発明によれば、加熱ローラ
の過剰加熱部分を空冷手段により冷却可能としているた
め、定着装置への転写紙サイズにかかわらず、加熱ロー
ラの軸方向温度分布を均一にすることがてきる。(Effects of the Invention) As is clear from the above description, according to the present invention, since the overheated portion of the heating roller can be cooled by air cooling means, the axial direction of the heating roller can be cooled regardless of the size of the transfer paper to the fixing device. Temperature distribution can be made uniform.
従って加熱ローラに異常高温部部分が発生しないため、
安全上も部品の寿命上にも何ら問題は生しない。Therefore, there will be no abnormally high temperature parts on the heating roller.
There are no problems in terms of safety or component life.
第１図は第１実施例に係る定着装置回りの断面 ６
図、第２図は第１図のＩＩ −ＩＩ矢視断面図（（ａ）
は風路調整板の作動前の状態を示し、（ｂ）は作動後の
状態を示す）、第３図は第２実施例に係る定着装置回り
の断面図、第４図は第３図のＩＶ−ＩＶ矢視断面図、第
５図は第３実施例に係る定着装置回りの断面図である。
２０・・・定着装置、２１・・・加熱ローラ、２１ｃ・
・・加熱源（熱源）、２２・・・加圧ローラ、２３．２
４・・・−シング、２５・・・温度検知手段（制御手段
）、３０・・・排熱ファン（空冷手段）、５１・・・冷
却ファン（空冷手段）。FIG. 1 is a cross-sectional view around the fixing device according to the first embodiment. FIG. 6 and FIG.
(b) shows the state before operation of the air passage adjustment plate, (b) shows the state after operation), FIG. 3 is a cross-sectional view of the fixing device and its surroundings according to the second embodiment, and FIG. FIG. 5 is a cross-sectional view taken along the line IV-IV, and is a cross-sectional view around the fixing device according to the third embodiment. 20...Fixing device, 21...Heating roller, 21c.
...Heat source (heat source), 22...Pressure roller, 23.2
4...-Thing, 25... Temperature detection means (control means), 30... Exhaust heat fan (air cooling means), 51... Cooling fan (air cooling means).
Claims (1)
た一対の定着ローラと、該定着ローラの周囲を覆うケー
シングと、前記加熱ローラの外表面温度を一定値に保持
するための制御手段とを有する定着装置において、前記
ケーシングの外側に、加熱ローラ回りに空気流を生じさ
せる空冷手段を設け、該空冷手段による空気流の量を加
熱ローラの軸方向に対して可変可能としたことを特徴と
する定着装置。a pair of fixing rollers, at least one of which has a heat source therein and serves as a heating roller; a casing that covers the fixing roller; and a control means for maintaining an outer surface temperature of the heating roller at a constant value. In the fixing device, an air cooling means for generating an air flow around the heating roller is provided on the outside of the casing, and the amount of air flow by the air cooling means can be varied in the axial direction of the heating roller. fixing device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1277117A JPH03139682A (en) | 1989-10-26 | 1989-10-26 | Fixing device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1277117A JPH03139682A (en) | 1989-10-26 | 1989-10-26 | Fixing device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH03139682A true JPH03139682A (en) | 1991-06-13 |
Family
ID=17579021
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1277117A Pending JPH03139682A (en) | 1989-10-26 | 1989-10-26 | Fixing device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH03139682A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0781185A (en) * | 1993-09-13 | 1995-03-28 | Nec Corp | Printer |
| US20110211859A1 (en) * | 2010-02-26 | 2011-09-01 | Konica Minolta Business Technologies, Inc. | Image forming apparatus |
| US9229380B2 (en) | 2012-03-29 | 2016-01-05 | Kyocera Document Solutions Inc. | Fixing device and image forming apparatus |
-
1989
- 1989-10-26 JP JP1277117A patent/JPH03139682A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0781185A (en) * | 1993-09-13 | 1995-03-28 | Nec Corp | Printer |
| US20110211859A1 (en) * | 2010-02-26 | 2011-09-01 | Konica Minolta Business Technologies, Inc. | Image forming apparatus |
| US8478156B2 (en) * | 2010-02-26 | 2013-07-02 | Konica Minolta Business Technologies, Inc | Image forming apparatus having air duct facing fixing member |
| US9229380B2 (en) | 2012-03-29 | 2016-01-05 | Kyocera Document Solutions Inc. | Fixing device and image forming apparatus |
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