JPH0619246A - Image forming device and heat fixing-device - Google Patents
Image forming device and heat fixing-deviceInfo
- Publication number
- JPH0619246A JPH0619246A JP4194825A JP19482592A JPH0619246A JP H0619246 A JPH0619246 A JP H0619246A JP 4194825 A JP4194825 A JP 4194825A JP 19482592 A JP19482592 A JP 19482592A JP H0619246 A JPH0619246 A JP H0619246A
- Authority
- JP
- Japan
- Prior art keywords
- heat
- temperature
- fixing roller
- unit
- air
- 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
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C59/00—Surface shaping of articles, e.g. embossing; Apparatus therefor
- B29C59/10—Surface shaping of articles, e.g. embossing; Apparatus therefor by electric discharge treatment
- B29C59/12—Surface shaping of articles, e.g. embossing; Apparatus therefor by electric discharge treatment in an environment other than air
Landscapes
- Health & Medical Sciences (AREA)
- Toxicology (AREA)
- Discharging, Photosensitive Material Shape In Electrophotography (AREA)
- Cleaning In Electrography (AREA)
- Control Or Security For Electrophotography (AREA)
- Details Of Measuring And Other Instruments (AREA)
- Fixing For Electrophotography (AREA)
Abstract
Description
【0001】[0001]
【産業上の利用分野】本発明は複写機、ファクシミリ、
レーザビームプリンタ等の画像形成装置の温度制御の構
成に関するものである。また本発明は画像形成装置の熱
定着装置に関するものである。BACKGROUND OF THE INVENTION The present invention relates to a copying machine, a facsimile,
The present invention relates to a temperature control configuration of an image forming apparatus such as a laser beam printer. The present invention also relates to a heat fixing device of an image forming apparatus.
【0002】[0002]
(1) 従来電子写真感光体を用いた画像形成装置では
例えば本出願人が特開昭62−296180号に開示し
ているように電子写真感光体の温度を所定の範囲に制御
する必要があり感光体表面近傍または内部に熱源を有し
サーモスタット等の温度調節部材を使用し温度制御して
いた。 (2) 電子写真法をとる画像形成装置では、トナー像
の用紙への定着方法として熱定着装置が多く使われてい
る。この熱定着を行う定着装置の性能を決める1つの要
因として定着ローラの肉厚がある。(1) In the conventional image forming apparatus using an electrophotographic photosensitive member, it is necessary to control the temperature of the electrophotographic photosensitive member within a predetermined range as disclosed in Japanese Patent Application Laid-Open No. 62-296180 by the present applicant. The temperature is controlled by using a temperature adjusting member such as a thermostat having a heat source near or inside the surface of the photoconductor. (2) In an image forming apparatus that uses an electrophotographic method, a thermal fixing device is often used as a method for fixing a toner image on a sheet. The thickness of the fixing roller is one factor that determines the performance of the fixing device that performs the heat fixing.
【0003】定着ローラは通常、アルミニウムや鉄系の
金属材料で作られており、この肉厚を薄くすると、その
時の定着ローラの体積つまり熱容量が減少する。このた
めに、装置立上げ時間(ウォームアップタイム)は短く
なることになる。The fixing roller is usually made of a metal material such as aluminum or iron. If the thickness of the fixing roller is reduced, the volume or heat capacity of the fixing roller at that time is reduced. For this reason, the device startup time (warm-up time) is shortened.
【0004】また、近年、市場ではより簡便なOA機器
が求められており、ウォームアップタイムを短くする必
要は高まっている。そのため、定着ローラの肉厚は可能
な限り薄くする方向の研究・開発が進められている。Further, in recent years, there has been a demand for a simpler OA device in the market, and there is an increasing need to shorten the warm-up time. For this reason, research and development are being conducted to reduce the thickness of the fixing roller as much as possible.
【0005】[0005]
【発明が解決しようとしている課題】しかしながら上記
従来例(1)では温度の立上がり時間を短くする要求か
ら、感光体に密接して面状発熱体を有するなど感光体近
傍に熱源を有する場合には感光体交換時に感光体と熱源
を離脱する手間がかかった。この欠点は感光体が有機光
導電体を含有する感光層を有した感光体のようにSe,
a−Siなどに比べて比較的寿命の短い、交換頻度の高
い感光体の場合に大きかった。However, in the above-mentioned conventional example (1), in the case where a heat source is provided in the vicinity of the photoconductor such as having a planar heating element in close contact with the photoconductor, it is necessary to shorten the rise time of the temperature. It took time to detach the heat source from the photoconductor when replacing the photoconductor. This drawback is due to the fact that the photoreceptor, such as a photoreceptor having a photosensitive layer containing an organic photoconductor, is
This was large in the case of a photoconductor that has a relatively short life compared with a-Si and has a high replacement frequency.
【0006】また、感光体のまわりに現像器を複数配
し、多色画像形成を行なう画像形成装置では感光体周長
が長い必要がありこの感光体に面状発熱体を配すると大
面積となりコストが大きくかかった。Further, in an image forming apparatus for forming a multicolor image by disposing a plurality of developing devices around the photosensitive member, the peripheral length of the photosensitive member needs to be long. It cost a lot.
【0007】また、感光体への熱の印加に局所的なムラ
の生じてしまうこと、感光体に対して風の当たる場所が
局所的であるため冷却に局所的なムラの生じてしまうこ
とのために温度分布にムラが生じてしまい、感光体特性
にムラが生じてしまい、感光体の感度ムラによる画像上
濃度ムラが生じてしまうという欠点があった。Further, the application of heat to the photoconductor causes local unevenness, and since the place where the wind hits the photoconductor is local, local unevenness occurs in cooling. As a result, there is a drawback that the temperature distribution becomes uneven, the characteristics of the photosensitive member become uneven, and the uneven density on the image occurs due to the uneven sensitivity of the photosensitive member.
【0008】本発明は上記課題を解決するためになされ
たもので、その目的とするところは感光体交換の手間の
かからない画像形成装置を提供することにある。The present invention has been made to solve the above problems, and an object of the present invention is to provide an image forming apparatus which does not require the trouble of replacing the photoconductor.
【0009】また、温度ムラに伴って湿度ムラが感光ド
ラム表面に生ずるので本発明の他の目的は感光ドラム表
面に湿度ムラのない画像形成装置を提供することにあ
る。Another object of the present invention is to provide an image forming apparatus having no unevenness of humidity on the surface of the photosensitive drum since unevenness of humidity occurs on the surface of the photosensitive drum due to uneven temperature.
【0010】本発明は感光ドラムをムラなく加熱するに
は感光ドラムを回転し乍ら加熱することを提案するが、
そうするとクリーニング器が温度の高い感光ドラムと摺
擦するので感光ドラムから感光体が削られ、又、クリー
ニング器の耐久力が劣化する。本発明の更なる目的は感
光ドラムを回転し乍ら調温する際にクリーニング器の耐
久力の劣化を防止するにある。The present invention proposes to heat the photosensitive drum by rotating it in order to uniformly heat the photosensitive drum.
Then, the cleaning device rubs against the photosensitive drum having a high temperature, so that the photosensitive member is scraped from the photosensitive drum and the durability of the cleaning device deteriorates. A further object of the present invention is to prevent deterioration of the durability of the cleaning device when the temperature of the photosensitive drum is adjusted by rotating it.
【0011】前記従来例(2)では、定着ローラの肉厚
を薄くしすぎると、熱容量の過小によりローラ表面温度
が急激に変化し易くなるために次の様な欠点があった。 小サイズ紙連続通紙時の非通紙部昇温が大きくな
る。このため、定着ローラのコーティング材の熱融解、
加圧ローラのゴムの劣化、定着装置周辺の部材の融解、
及び熱劣化等のおそれがある。 スタンバイ状態時での定着ローラの軸方向の各部の
温度差が大きくなる。特に定着ローラ中央部で最高温と
なりこの状態で複写するとこの温度の高い部分で高温オ
フセットが発生し、定着ローラ表面のトナー汚れ、転写
紙上へのトナー汚れが起こる。In the conventional example (2), if the thickness of the fixing roller is too thin, the surface temperature of the roller is apt to change rapidly due to an excessively small heat capacity. The temperature rise in the non-sheet passing area becomes large during continuous feeding of small size paper. For this reason, heat fusion of the coating material of the fixing roller,
Deterioration of rubber of pressure roller, melting of members around fixing device,
And there is a risk of heat deterioration. The temperature difference between the axial portions of the fixing roller in the standby state becomes large. In particular, when the temperature reaches the maximum in the central portion of the fixing roller and when copying is performed in this state, high temperature offset occurs, and toner stains on the surface of the fixing roller and toner stains on the transfer paper occur.
【0012】そのため、従来は、所定の肉厚以上の定着
ローラを用いて上記を防いでいたが、このために、 装置立上げ時のウエイトタイムが長くなる。 定着ローラの材料が多く必要となってしまう。 等の欠点があった。Therefore, in the past, a fixing roller having a predetermined thickness or more was used to prevent the above problem. However, for this reason, the wait time at the time of starting the apparatus becomes long. A large amount of material is required for the fixing roller. There were drawbacks such as.
【0013】本発明は定着ローラの部分昇温を防止した
熱定着装置を提供することを目的としている。An object of the present invention is to provide a thermal fixing device which prevents partial temperature rise of the fixing roller.
【0014】[0014]
【課題を解決するための手段】本発明の第1の発明は像
担持体に温風を送風する送風手段と、該像担持体の温度
を測定する温度測定手段とを有し、該温度手段による測
定結果に応じて前記送風手段を制御することを特徴とす
る画像形成装置である。The first invention of the present invention comprises an air blowing means for blowing warm air to the image bearing member and a temperature measuring means for measuring the temperature of the image bearing member. The image forming apparatus is characterized in that the blower unit is controlled according to the measurement result of
【0015】本発明の第2の発明は像担持体に温風を送
風する送風手段と、該像担持体の温度を測定する温度測
定手段と、所定タイミングでクリーニング手段を像担持
体から離脱する離脱手段とを有し、該温度手段による測
定結果に応じて前記送風手段を制御することを特徴とす
る画像形成装置である。According to a second aspect of the present invention, a blowing means for blowing warm air to the image carrier, a temperature measuring means for measuring the temperature of the image carrier, and a cleaning means are detached from the image carrier at a predetermined timing. An image forming apparatus comprising: a detaching unit, and controlling the blower unit according to a measurement result of the temperature unit.
【0016】本発明の第3の発明はクリーニング手段を
像担持体から離脱させる離脱手段を有し、所定タイミン
グで該像担持体を移動させ、かつ該クリーニング手段及
び離脱手段を動作させることを特徴とする画像形成装置
である。A third aspect of the present invention is characterized in that it has a detaching means for detaching the cleaning means from the image carrier, moves the image carrier at a predetermined timing, and operates the cleaning means and the detaching means. Image forming apparatus.
【0017】本発明の第4の発明は像担持体が有機光導
電体を含有する感光層を設けた電子写真感光体である第
1の発明または第2の発明に記載の画像形成装置であ
る。A fourth invention of the present invention is the image forming apparatus according to the first invention or the second invention, wherein the image carrier is an electrophotographic photoreceptor provided with a photosensitive layer containing an organic photoconductor. .
【0018】本発明の第5の発明は送風手段が放電手段
により発生する不用物を除去する除去手段を共用とする
第1の発明または第2の発明に記載の画像形成装置であ
る。A fifth invention of the present invention is the image forming apparatus according to the first invention or the second invention, in which the blowing means shares the removing means for removing the waste generated by the discharging means.
【0019】本発明の第6の発明は送風手段を制御する
際に、像担持体を移動させる手段を有する第1の発明ま
たは第2の発明に記載の画像形成装置である。A sixth invention of the present invention is the image forming apparatus according to the first invention or the second invention, which has means for moving the image carrier when controlling the blowing means.
【0020】本発明の第7の発明はクリーニング手段を
像担持体から離脱するタイミングが非画像形成時である
第2の発明に記載の画像形成装置である。The seventh invention of the present invention is the image forming apparatus according to the second invention, wherein the timing of removing the cleaning means from the image carrier is during non-image formation.
【0021】本発明の第8の発明は定着ローラと、該定
着ローラの加熱手段と、該定着ローラに送風する送風機
と、送風機から定着ローラの長手方向の夫々の個所へ送
風可能な複数の送風通路と、複数の送風通路に夫々設け
られ、該送風通路を開く位置と遮断する位置をとること
のできる可動の風遮断部材と、少くとも一部分が該定着
ローラの近傍にあり、温度に応じて形を変えることがで
きて、該風遮断部材と係合する熱反応変形部材と、該風
遮断部材を送風通路を遮断する方向へ付勢する弾性部材
とを有し、該熱反応変形部材が所定の温度以上になると
該熱反応変形部材が該風遮断部材を送風機から定着ロー
ラへの送風通路を開く位置に移動させることを特徴とす
る熱定着装置である。An eighth aspect of the present invention is to provide a fixing roller, a heating means for the fixing roller, a blower for blowing air to the fixing roller, and a plurality of blowers capable of blowing air from the blower to respective portions in the longitudinal direction of the fixing roller. A passage and a movable air-blocking member that is provided in each of the plurality of air-blowing passages and that can take a position that shuts off the air-blowing passage from the position where the air-blowing passage is opened. The heat-reaction deforming member is changeable in shape and has a heat-reaction deforming member that engages with the wind-blocking member, and an elastic member that urges the wind-blocking member in a direction to block the air passage, In the thermal fixing device, the thermal reaction deformation member moves the air blocking member to a position where an air passage from the air blower to the fixing roller is opened when the temperature reaches or exceeds a predetermined temperature.
【0022】本発明の第9の発明は該熱反応変形部材が
該風遮断部材を兼ねることを特徴とする第8の発明に記
載の熱定着装置である。A ninth invention of the present invention is the thermal fixing apparatus according to the eighth invention, wherein the heat-reactive deforming member also serves as the wind blocking member.
【0023】本発明の第10の発明は該熱反応変形部材
が形状記憶合金であることを特徴とする第8のまたは第
9の発明に記載の熱定着装置である。The tenth invention of the present invention is the thermal fixing apparatus according to the eighth or ninth invention, wherein the heat-reactive deformation member is a shape memory alloy.
【0024】本発明の第11の発明は該熱反応変形部材
がバイメタルであることを特徴とする第8の発明に記載
の熱定着装置である。An eleventh invention of the present invention is the thermal fixing apparatus according to the eighth invention, wherein the heat-reactive deformation member is a bimetal.
【0025】本発明の第12の発明は該熱反応変形部材
の少くとも一部分が黒色であることを特徴とする第8の
発明から第11の発明の何れか1つに記載の熱定着装置
である。The twelfth invention of the present invention is the heat fixing apparatus as described in any one of the eighth to eleventh inventions, characterized in that at least a part of the heat-reactive deformation member is black. is there.
【0026】本発明の第13の発明は該熱反応変形部材
が熱伝導率の低い部材を介して他の部材と係合すること
を特徴とする第8の発明から第12の発明の何れか1つ
に記載の熱定着装置である。The thirteenth invention of the present invention is any one of the eighth to twelfth inventions, characterized in that the heat-reactive deformation member engages with another member via a member having a low thermal conductivity. The heat fixing device according to the first aspect.
【0027】上記方法により、定着ローラの高温部分の
みを空冷することができる。このため、薄肉定着ローラ
を用いることができるので、 ウエイトタイムの短縮 定着ローラ材料の節減 が可能となった。By the above method, only the high temperature portion of the fixing roller can be cooled by air. For this reason, a thin fixing roller can be used, which shortens the wait time and saves the material of the fixing roller.
【0028】[0028]
【実施例】 「実施例1」図面は一実施例を示すもので図1は本発明
に従う送風手段を具備させてなるレーザビームプリンタ
の概略構成図である。[First Embodiment] FIG. 1 shows an embodiment, and FIG. 1 is a schematic configuration diagram of a laser beam printer provided with a blowing unit according to the present invention.
【0029】表面に有機光導電体(OPC)を有する像
担持体としての感光ドラム1は矢印方向に回転駆動され
る。この感光ドラム1の表面は放電手段としてのコロナ
放電器2により帯電される。コロナ放電器2のシールド
部材の背面(感光ドラム1と反対側の面)には感光ドラ
ム1の軸方向にほぼ帯電器幅の長さ分の開口部を設け、
送風手段としての送風ファン3によりエアダクト4及び
放電手段として設けたコロナ放電器2のシールド部材を
介して感光ドラム1側に送風を行う。エアダクト4の空
気取入れ側開口部には放電ワイヤの汚れの原因となる塵
埃を阻止するエアフィルタ5が設けられている。The photosensitive drum 1 as an image carrier having an organic photoconductor (OPC) on its surface is rotationally driven in the direction of the arrow. The surface of the photosensitive drum 1 is charged by a corona discharger 2 as a discharging means. On the back surface of the shield member of the corona discharger 2 (the surface opposite to the photosensitive drum 1), an opening portion is provided in the axial direction of the photosensitive drum 1 for substantially the width of the charger.
The air is blown to the photosensitive drum 1 side by the blower fan 3 as the blower means through the air duct 4 and the shield member of the corona discharger 2 provided as the discharge means. An air filter 5 is provided at the opening of the air duct 4 on the air intake side to prevent dust that causes the discharge wire to become dirty.
【0030】上記コロナ放電器2により帯電された感光
ドラム1表面は不図示のポリゴンミラースキャナ系によ
り制御信号に基いたレーザビーム走査(主走査)露光E
が行われ、静電潜像が形成される。この静電潜像はコロ
ナ放電器2の帯電極性と同極性のトナーを有する現像器
(現像バイアスが印加されている)6により反転現像さ
れる。The surface of the photosensitive drum 1 charged by the corona discharger 2 is subjected to laser beam scanning (main scanning) exposure E based on a control signal by a polygon mirror scanner system (not shown).
And an electrostatic latent image is formed. This electrostatic latent image is reversely developed by a developing device (having a developing bias applied) 6 having toner having the same polarity as the charging polarity of the corona discharger 2.
【0031】現像されたトナー像は転写コロナ放電器7
によって紙等の転写材Pに転写される。転写材Pは分離
コロナ放電器8によって感光ドラム1面から順次に除電
分離され、図に省略した加熱式等の定着装置(例えば図
4)に運ばれ像定着されて複写物として機外へ排出され
る。The developed toner image is transferred to the transfer corona discharger 7
Is transferred to a transfer material P such as paper. The transfer material P is sequentially subjected to static elimination from the surface of the photosensitive drum 1 by the separation corona discharger 8, conveyed to a heating type fixing device (not shown) (for example, FIG. 4), image-fixed and discharged outside the machine as a copy. To be done.
【0032】転写後の感光ドラム1表面はクリーニング
前コロナ放電器9により除電され、クリーニング器10
を感光ドラム1から離脱させる後述する不図示の離脱手
段により、感光ドラム1に当接されたクリーニング手段
としてのクリーニング器10でクリーニングされ、さら
に除電ランプ11により全面露光されて前歴を消去され
次の画像形成に備えられる。The surface of the photosensitive drum 1 after transfer is decharged by the pre-cleaning corona discharger 9, and the cleaning device 10
Is removed from the photosensitive drum 1 by a detaching means (not shown) which will be described later, and is cleaned by a cleaning device 10 as a cleaning means that is in contact with the photosensitive drum 1, and the entire surface is exposed by a discharging lamp 11 to erase the previous history. Prepared for image formation.
【0033】吸引ファン13を含む空気吸引排気ダクト
12は3本の分岐ダクト121,122及び123を有
し、分岐ダクト121は感光ドラム1の周面の移動方向
に関しコロナ放電器2の下流側のシールド部材側面と感
光ドラム1との開口域から吹き出すオゾンを含む空気を
吸引する。分岐ダクト122は感光ドラム1の周面の移
動方向に関しコロナ放電器2の上流側のシールド部材側
面と感光ドラム1との開口域から吹き出すオゾンを含む
空気を吸引する。更に分岐ダクト123は感光ドラム1
の周面の移動方向に関しクリーニング器10の上流側の
コロナ放電器9のシールド部材の背面の開口部から該放
電器内の空気を吸引する。上記の各分岐ダクト121,
122,123の空気吸引開口部の感光ドラム1の軸方
向長さは、ほぼコロナ放電器2及びクリーニング器10
の上流側のコロナ放電器9の帯電長さ分に等しい。吸引
ファン13により吸引排気される側のダクト12の開口
部にはトナーなどの装置外排出を阻止するエアフィルタ
14及びオゾンの排気を阻止するオゾンフィルタ15が
設けられている。The air suction / exhaust duct 12 including the suction fan 13 has three branch ducts 121, 122 and 123. The branch duct 121 is located downstream of the corona discharger 2 with respect to the moving direction of the peripheral surface of the photosensitive drum 1. Air containing ozone, which is blown from the opening area between the side surface of the shield member and the photosensitive drum 1, is sucked. The branch duct 122 sucks air containing ozone blown from the opening area between the photosensitive drum 1 and the upstream side of the shield member of the corona discharger 2 in the moving direction of the peripheral surface of the photosensitive drum 1. Further, the branch duct 123 is the photosensitive drum 1.
The air in the discharger is sucked from the opening on the back surface of the shield member of the corona discharger 9 on the upstream side of the cleaning device 10 with respect to the moving direction of the peripheral surface. Each branch duct 121,
The axial length of the photosensitive drum 1 at the air suction openings 122 and 123 is approximately equal to the corona discharger 2 and the cleaning device 10.
Is equal to the charging length of the corona discharger 9 on the upstream side. An air filter 14 for blocking the discharge of toner and the like from the apparatus and an ozone filter 15 for blocking the exhaust of ozone are provided at the opening of the duct 12 on the side where the suction fan 13 sucks and exhausts the air.
【0034】送風手段として設けた送風ファン3の吐出
口側には送風を妨げないような発熱体21を有し、送風
部より離れかつ感光ドラム1近傍に感光ドラム1の表面
温度を計測するためのサーミスタなどの温度測定手段と
しての温度センサ22を有する。本例ではコロナ放電器
9と同位置に温度センサ22を配設してある。A blower fan 3 provided as a blower has a heating element 21 on the discharge port side so as not to interfere with blown air, so as to measure the surface temperature of the photosensitive drum 1 apart from the blower and near the photosensitive drum 1. It has a temperature sensor 22 as a temperature measuring means such as a thermistor. In this example, the temperature sensor 22 is arranged at the same position as the corona discharger 9.
【0035】温度センサ22による検知温度によって発
熱体21の発熱量と送風ファン3、吸引ファン13のオ
ンオフを制御する。例えば40℃を中心温度にして制御
したい場合には該検知温度Tが39〜43℃ならば発熱
体21と送風ファン3の両方をオフし、T>43℃なら
ばファン3,13をオンし、T<39℃ならばファン
3,13、発熱体21をオンする、といったように制御
する。The amount of heat generated by the heating element 21 and on / off of the blower fan 3 and the suction fan 13 are controlled by the temperature detected by the temperature sensor 22. For example, when it is desired to control the temperature at 40 ° C. as the central temperature, both the heating element 21 and the blower fan 3 are turned off when the detected temperature T is 39 to 43 ° C., and the fans 3 and 13 are turned on when T> 43 ° C. , T <39 ° C., the fans 3 and 13 and the heating element 21 are turned on.
【0036】この動作を温度制御動作と呼ぶが、この送
風ファン3、吸引ファン13のオン動作と共に特開昭6
3−178259号に示したように、コロナ放電器2の
コロナ放電ワイヤにトナーやゴミなどの付着を防止して
放電ムラを防止すると共に放電中に発生する不用物とし
てのオゾンなどをコロナ放電器2のシールドケース外に
排出することになる。この動作をオゾン排出動作とよぶ
が、それ以外に次のタイミングに送風ファン3、吸引フ
ァン13を動作させる。即ち、画像形成中、画像形成終
了後、装置のメイン電源スイッチオフ後、ジャム発生
後、装置のドアスイッチ開閉後、及びシーケンス制御エ
ラー発生後などの画像形成停止後所定時間動作させる。This operation is called a temperature control operation, and together with the operation of turning on the blower fan 3 and the suction fan 13, it is disclosed in Japanese Patent Laid-Open No.
As shown in JP-A-3-178259, the corona discharge wire of the corona discharger 2 is prevented from adhering toner and dust to prevent uneven discharge, and ozone such as unnecessary substances generated during discharge is corona discharger. It will be discharged to the outside of the shield case of No.2. This operation is called an ozone discharging operation, but in addition to that, the blower fan 3 and the suction fan 13 are operated at the next timing. That is, during image formation, after image formation is completed, after the main power switch of the apparatus is turned off, after a jam has occurred, after the door switch of the apparatus has been opened and closed, and after a sequence control error has occurred, operation is performed for a predetermined time after image formation is stopped.
【0037】ファン3,13の動作に関してはオゾン排
出動作と温度制御動作の和(オア)をとる。Regarding the operation of the fans 3 and 13, the sum (OR) of the ozone discharge operation and the temperature control operation is taken.
【0038】本実施例では発熱体21を送風ファン3の
吐出口付近に設けたが、本発明はこれに限らない。送風
ファンと発熱体を組合せた手段を感光ドラム近傍に有
し、前述したファン3,13、発熱体21の制御と同様
な制御を行なうことにより、発熱させるのに効率のよい
感光ドラム上の領域に自由に発熱部を配置できる利点が
ある。Although the heating element 21 is provided near the discharge port of the blower fan 3 in this embodiment, the present invention is not limited to this. An area on the photosensitive drum that is efficient for generating heat is provided by having a means combining a blower fan and a heating element near the photosensitive drum, and performing the same control as the control of the fans 3, 13 and the heating element 21 described above. There is an advantage that the heat generating portion can be freely arranged.
【0039】また、送風、発熱部を複数有することによ
り感光ドラム上の発熱させる面積が増え、感光ドラムの
温度立上がりを速くできる利点を有することができる。Further, by providing a plurality of air-blowing and heat-generating portions, the area of the photosensitive drum on which heat is generated is increased, and the temperature rise of the photosensitive drum can be speeded up.
【0040】また、送風部、発熱部は感光ドラム1から
離れているため感光ドラム1交換時に隔離する構造にす
る必要がなく、手間が少なくコストを安くできる。特に
この効果は有機光導電体のような比較的寿命の短い感光
体の場合に大きい。Further, since the blower section and the heat generating section are separated from the photosensitive drum 1, there is no need to have a structure for separating them when the photosensitive drum 1 is replaced, and the labor is small and the cost can be reduced. This effect is particularly great in the case of a photoreceptor having a relatively short life such as an organic photoconductor.
【0041】なお、上記の送風及び吸引は感光ドラム1
の回転時のみならず長時間行うものであるから、ファン
の騒音、耐久性、消費電力が問題となるが、感光ドラム
1の回転時に比べて感光ドラム1の温度低下要因が小さ
いことと、画像形成中に発生するオゾン量は画像形成停
止中には増加しないことを考慮し、画像形成中と比べて
画像形成後または画像形成後一定時間経過後のファン駆
動、または発熱動作は電圧を制御するなどによって消費
電力を画像形成中の20%ないし50%にすることによ
り、上述効果を低下させずに前記問題点を解決できる。The above-mentioned air blowing and suction is performed by the photosensitive drum 1.
The noise, durability, and power consumption of the fan become a problem because it is performed for a long time as well as when the photosensitive drum 1 is rotated, and the temperature lowering factor of the photosensitive drum 1 is smaller than that when the photosensitive drum 1 is rotated. Considering that the amount of ozone generated during image formation does not increase while image formation is stopped, the voltage is controlled during fan drive or after heat generation for a certain period of time after image formation, compared to during image formation. By setting the power consumption to 20% to 50% of that during image formation by the above, the above problems can be solved without deteriorating the above effects.
【0042】また、発熱、送風している際に感光ドラム
を回転させるようなシーケンスをとることにより、感光
ドラム上の温度ムラをなくし、又温度立上がりを早くす
ることができる。Further, by adopting a sequence in which the photosensitive drum is rotated during heat generation and blowing, it is possible to eliminate temperature unevenness on the photosensitive drum and to speed up the temperature rise.
【0043】この場合に感光ドラム1の回転速度を画像
形成時より遅くすることによって上述効果を保ったまま
省電力を達成することができる。In this case, by making the rotation speed of the photosensitive drum 1 slower than that at the time of image formation, power saving can be achieved while maintaining the above effect.
【0044】「実施例2」図2は実施例2を示す。感光
ドラム1の回転軸中に棒状ヒータ24を配し、感光ドラ
ム1の表面温度を計測するためのサーミスタなどの温度
センサ25,26が配設してある。[Second Embodiment] FIG. 2 shows a second embodiment. A rod-shaped heater 24 is arranged in the rotary shaft of the photosensitive drum 1, and temperature sensors 25 and 26 such as thermistors for measuring the surface temperature of the photosensitive drum 1 are provided.
【0045】温度センサ25による検知温度によってヒ
ータ24のオンオフを制御する。例えば40℃を中心温
度にして制御したい場合には検知温度をTとして T>41℃ならばヒータ オフ T<39℃ならばヒータ オン といったように制御する。On / off of the heater 24 is controlled by the temperature detected by the temperature sensor 25. For example, when it is desired to control the temperature at 40 ° C. as the central temperature, the detected temperature is set to T. If T> 41 ° C., the heater is turned off.
【0046】本実施例においては非画像形成時にも感光
ドラム1を回転させ、同時にクリーニング器10を感光
ドラム1より離脱させる。In this embodiment, the photosensitive drum 1 is rotated even during non-image formation, and at the same time, the cleaning device 10 is detached from the photosensitive drum 1.
【0047】図3には本発明に係る非画像形成時に感光
ドラム1より離脱させるクリーニング器10の構成例を
示した。クリーニング器10が感光ドラム1に当接して
いる状態を示している。クリーニング器10はコピース
タート信号と共に当接し、感光ドラム1上の残トナーを
クリーニングブレード16でかき落とし可撓性のすくい
シート17で受け、ハウジング内に廃トナー18として
溜め、スクリュー19によって廃トナーだめ(不図示)
まで送る。FIG. 3 shows an example of the structure of the cleaning device 10 according to the present invention, which is detached from the photosensitive drum 1 during non-image formation. The cleaning device 10 is in contact with the photosensitive drum 1. The cleaning device 10 contacts with the copy start signal, scrapes off the residual toner on the photosensitive drum 1 with the cleaning blade 16, receives it with the flexible scooping sheet 17, stores it as waste toner 18 in the housing, and collects waste toner with the screw 19. (Not shown)
Send to.
【0048】画像形成後、クリーニング器10が離脱す
る構成は例えば図3の通りである。クリーニング器10
は筺体適所に取付けられた軸20に揺動自在に取付けら
れたレバー22の一端に取付けられ、レバー22の他端
には一端が不動部分に係止された引張バネ21の他端が
係止されており、軸20を中心に時計方向に付勢され、
感光ドラム1に当接している。クリーニング器10を取
付けたレバー22の端部と本体に固定したソレノイド2
3の可動杆23aはリンクとなった連結杆27により結
合されている。ソレノイド23が付勢されると可動杆2
3aはソレノイド中へ引込まれ、連結杆27を引いてレ
バー22を軸20を中心に引張バネ21に抗して反時計
方向に回転し、クリーニング器10を感光ドラム1から
離脱する。The structure in which the cleaning device 10 is detached after the image formation is as shown in FIG. 3, for example. Cleaning device 10
Is attached to one end of a lever 22 swingably attached to a shaft 20 attached to a proper position of the housing, and the other end of the lever 22 is engaged with the other end of a tension spring 21 whose one end is locked to a stationary part. And is biased clockwise about the shaft 20,
It is in contact with the photosensitive drum 1. Solenoid 2 fixed to the end of lever 22 to which cleaning device 10 is attached and the main body
The three movable rods 23a are connected by a connecting rod 27 which is a link. When the solenoid 23 is energized, the movable rod 2
3a is pulled into the solenoid, pulls the connecting rod 27, rotates the lever 22 counterclockwise about the shaft 20 against the tension spring 21, and removes the cleaning device 10 from the photosensitive drum 1.
【0049】ソレノイド23のオンオフによってクリー
ニング器10は感光ドラム1に当接位置と離脱位置を選
択的にとりうるようになっており、画像形成時(前回転
準備動作を含む)はソレノイド23をオフし、画像形成
後にソレノイド23をオンしてクリーニング器10を感
光ドラム1から離脱する。By turning on / off the solenoid 23, the cleaning device 10 can selectively take the contact position and the release position with respect to the photosensitive drum 1, and the solenoid 23 is turned off during image formation (including the pre-rotation preparation operation). After the image formation, the solenoid 23 is turned on and the cleaning device 10 is removed from the photosensitive drum 1.
【0050】クリーニング器10を離脱させるタイミン
グは本実施例に限られるものではない。例えば画像形成
後所定時間、クリーニング器10を当接させ、感光ドラ
ム1を回転させた後離脱させることにより、本発明の効
果を維持しつつ、感光ドラム1上に付着し、感光ドラム
1の画像形成中の回転ではとりきれない付着物をも除去
し得るという効果がある。The timing for removing the cleaning device 10 is not limited to this embodiment. For example, by adhering the cleaning device 10 for a predetermined time after image formation, rotating the photosensitive drum 1 and then separating it, the cleaning device 10 adheres onto the photosensitive drum 1 while maintaining the effect of the present invention, and the image on the photosensitive drum 1 is formed. There is an effect that it is possible to remove the deposits that cannot be completely removed by the rotation during formation.
【0051】本実施例によって感光ドラム1を回転させ
るため、感光ドラム1の表面温度がファン送風口の出口
付近のみ低いといった感光ドラム表面温度ムラをなくす
ことができる。Since the photosensitive drum 1 is rotated according to the present embodiment, it is possible to eliminate unevenness of the photosensitive drum surface temperature such that the surface temperature of the photosensitive drum 1 is low only near the outlet of the fan blow port.
【0052】本発明においてはクリーニング器10を適
時離脱させるため、感光ドラム1の回転時、常時クリー
ニング器10を感光ドラム1に当接することによる感光
ドラム1の表面の削れ、クリーニングブレードの破損を
最小限に抑えることができる。In the present invention, since the cleaning device 10 is detached at a proper time, when the photosensitive drum 1 is rotated, abrasion of the surface of the photosensitive drum 1 and damage to the cleaning blade caused by constantly contacting the cleaning device 10 with the photosensitive drum 1 are minimized. You can keep it to the limit.
【0053】また、本発明の構成によるクリーニング器
の離脱によって感光ドラム1周面近くのオゾンなどの排
出を妨げる障害がなくなり、オゾンなどの排出が円滑に
行なわれる。Further, by removing the cleaning device according to the configuration of the present invention, there is no obstacle to the discharge of ozone or the like near the peripheral surface of the photosensitive drum 1, and the discharge of ozone or the like is smoothly performed.
【0054】なお、本発明は以下のような構成にするこ
とにより、より効率的にすることができる。The present invention can be made more efficient by adopting the following configuration.
【0055】図2中の複数の温度センサ25,26の検
知温度差が設定値以上、例えば3℃以上になったときの
み、感光ドラム1の表面温度のムラがあると判断して感
光ドラム1を回転し、クリーニング器10の感光ドラム
1からの離脱を行なうようにすることによって電力を節
約しつつ本発明の効果を維持することができる。感光ド
ラム1の表面温度ムラの検出手段はこれに限られたもの
ではなく、例えば放射赤外線検出手段を複数有する構成
としてもよい。Only when the difference between the temperatures detected by the plurality of temperature sensors 25 and 26 shown in FIG. 2 exceeds a set value, for example, 3 ° C. or more, it is judged that the surface temperature of the photosensitive drum 1 is uneven, and the photosensitive drum 1 is determined. It is possible to maintain the effect of the present invention while saving electric power by rotating the cleaning device 10 to separate the cleaning device 10 from the photosensitive drum 1. The means for detecting the unevenness of the surface temperature of the photosensitive drum 1 is not limited to this. For example, a configuration having a plurality of radiant infrared ray detecting means may be used.
【0056】なお、本発明の実施例は図1,2に示した
ようなレーザビームプリンタに限られない。温調の必要
な像担持体を有する画像形成装置に適用されるものであ
る。The embodiment of the present invention is not limited to the laser beam printer as shown in FIGS. The present invention is applied to an image forming apparatus having an image carrier that requires temperature control.
【0057】また、感光ドラムのまわりに現像器を複数
配し、多色画像形成を行なう画像形成装置では感光体周
長が長い必要がありこの感光体に面状発熱体を配しても
大面積となり温度ムラが大きくなる問題点があったが、
本発明を適用することにより感光体周長の長い場合でも
ムラのない温調を実現できた。Further, in an image forming apparatus for forming a multicolor image by arranging a plurality of developing devices around the photosensitive drum, it is necessary that the peripheral length of the photosensitive member is long. There was a problem that it became an area and temperature unevenness became large,
By applying the present invention, uniform temperature control can be realized even when the peripheral length of the photoconductor is long.
【0058】さらに、非画像形成時に感光ドラム1の回
転速度を変える手段を有することにより、より効率的に
ムラのない表面温度を得ることができる。Furthermore, by providing a means for changing the rotation speed of the photosensitive drum 1 during non-image formation, it is possible to more efficiently obtain a uniform surface temperature.
【0059】感光ドラム1の回転速度をおとすタイミン
グは例えばファン3,13の停止時に行なうようにす
る。The timing at which the rotation speed of the photosensitive drum 1 is lowered is set, for example, when the fans 3 and 13 are stopped.
【0060】既に述べたようにファン3,13の動作は
特開昭63−178259号に示したようにコロナ放電
器2のコロナ放電ワイヤにトナーやゴミなどの付着を防
止して放電ムラを防止すると共に放電中に発生するオゾ
ンなどのコロナ放電器2のシールド外に排出するため
に、送風ファン3、吸引ファン13を動作せしめる。こ
の動作をオゾン排出動作とよぶが、そのタイミングは画
像形成中、画像形成終了後、装置のメイン電源スイッチ
オフ後、ジャム発生後、装置のドアスイッチ開閉後、及
びシーケンス制御エラー発生後などの画像形成停止後、
所定時間動作させる。As described above, the operation of the fans 3 and 13 prevents uneven discharge by preventing toner and dust from adhering to the corona discharge wire of the corona discharger 2 as shown in JP-A-63-178259. At the same time, the blower fan 3 and the suction fan 13 are operated to discharge ozone or the like generated during the discharge to the outside of the shield of the corona discharger 2. This operation is called the ozone discharge operation, and the timing of the operation is during image formation, after image formation, after the main power switch of the device is turned off, after a jam has occurred, after the door switch of the device has been opened or closed, and after a sequence control error has occurred. After formation stopped,
Operate for a predetermined time.
【0061】この動作終了後、感光ドラム1の回転速度
を例えば1/4に落とす。After this operation is completed, the rotation speed of the photosensitive drum 1 is reduced to, for example, 1/4.
【0062】「実施例3」図4は定着装置の斜視図であ
る。定着ローラ31は肉厚2mmのアルミニウム製の中
空円筒の両端を、ステー34で剛結された側板33,3
9に回転自在に支持されており、定着ローラ31の側板
33外の端部には図外のギヤと噛合って駆動を受けるギ
ヤ32が固定されている。定着ローラ31の中心部には
加熱手段としてハロゲンヒータ45が挿通しており、定
着ローラ31への熱供給が行われる。定着ローラ31の
軸方向の通紙基準位置Bに図示されないサーミスタが当
接していてサーミスタに連結した調温回路でもって定着
ローラ31の通紙基準位置Bを180℃に調温してい
る。[Third Embodiment] FIG. 4 is a perspective view of a fixing device. The fixing roller 31 is a side plate 33, 3 in which both ends of a hollow aluminum cylinder having a thickness of 2 mm are rigidly connected by stays 34.
9 is rotatably supported, and a gear 32 that is driven by meshing with a gear (not shown) is fixed to an end of the fixing roller 31 outside the side plate 33. A halogen heater 45 as a heating means is inserted through the central portion of the fixing roller 31, and heat is supplied to the fixing roller 31. A thermistor (not shown) is in contact with the paper feed reference position B in the axial direction of the fixing roller 31, and the paper feed reference position B of the fixing roller 31 is adjusted to 180 ° C. by a temperature control circuit connected to the thermistor.
【0063】図5に示すように定着ローラ31には芯金
の外周を厚く弾性体で被覆した加圧ローラ40が圧接従
動回転するようになっており、定着入口ガイド43上に
送られて来た転写材は定着ローラ31と加圧ローラ40
のニップ部で転写材上の未定着画像を加熱されると共に
圧されて定着され、上分離爪41、下分離爪42で夫々
定着ローラ31、加圧ローラ40への巻きつきを防止さ
れ排出される。As shown in FIG. 5, the fixing roller 31 is provided with a pressure roller 40 in which the outer periphery of a core metal is thickly covered with an elastic member and is rotated by pressure contact, and is sent onto a fixing inlet guide 43. The transfer material is a fixing roller 31 and a pressure roller 40.
The unfixed image on the transfer material is heated and pressed at the nip portion of the sheet to be fixed, and the upper separation claw 41 and the lower separation claw 42 prevent the fixing roller 31 and the pressure roller 40 from being wound around and are discharged. It
【0064】ステー34は通紙方向の断面が鍵形をして
おり、垂下部には角穴47(47a〜47d)が設けら
れ、各角穴47を開閉する風遮断部材としてシャッター
37(37a〜37d)が定着ローラ31と平行に側板
33,39に支持された軸38に回転自在に嵌合してい
る。温度に応じて形を変えることのできる熱反応変形部
材として設けた形状記憶合金製の形状記憶バネ35(3
5a〜35d)は一端がステー34の上面に係止され、
他端がシャッター37の先端部に係止されている。ステ
ンレス製のバネ36(36a〜36d)は一端がステー
34の垂下部の下縁に係止され他端がシャッター37の
先端部に係止された引張コイルバネである。The stay 34 has a key-shaped cross section in the sheet passing direction, and is provided with square holes 47 (47a to 47d) in the hanging portion. The shutter 37 (37a) serves as a wind blocking member for opening and closing the square holes 47. .About.37d) are rotatably fitted to the shaft 38 supported by the side plates 33 and 39 in parallel with the fixing roller 31. Shape memory spring 35 (3) made of a shape memory alloy provided as a thermal reaction deformable member capable of changing its shape depending on temperature.
5a to 35d) has one end locked to the upper surface of the stay 34,
The other end is locked to the tip of the shutter 37. The spring 36 (36a to 36d) made of stainless steel is a tension coil spring having one end locked to the lower edge of the hanging portion of the stay 34 and the other end locked to the tip of the shutter 37.
【0065】ここで、この形状記憶合金製の形状記憶バ
ネ35は、温度が200℃を越えると縮む様に設定され
ており、また、定着ローラ31の真近にあるため、ほぼ
定着ローラ31の表面温度と等しい温度になる。Here, the shape memory spring 35 made of the shape memory alloy is set so as to shrink when the temperature exceeds 200 ° C. Further, since it is close to the fixing roller 31, it is almost the same as that of the fixing roller 31. The temperature becomes equal to the surface temperature.
【0066】この定着装置を装備する画像形成装置例え
ば複写機の本体には送風機としてクロスフローファン4
4が定着ローラ31と平行に設けてある。クロスフロー
ファン44はその吐出口44aが各角穴47を一括して
覆っており、上部に吸込口44bを備える。該クロスフ
ローファン44のケーシング44cには吐出口44aの
下縁に側孔44dが設けてある。ケーシング44c内に
収容された羽根車44eは不図示のモータにより回転す
るようになっている。このクロスフローファン44は吐
出風速が5m/sとなっている。上記構成により、吐出
口44a、角穴47、ステー34内空間は送風機のクロ
スフローファン44からの送風通路となっている。An image forming apparatus equipped with this fixing device, for example, a main body of a copying machine, has a cross flow fan 4 as a blower.
4 is provided in parallel with the fixing roller 31. The cross flow fan 44 has its discharge port 44a collectively covering the respective square holes 47, and has a suction port 44b in the upper part. The casing 44c of the cross flow fan 44 has a side hole 44d at the lower edge of the discharge port 44a. The impeller 44e housed in the casing 44c is rotated by a motor (not shown). The crossflow fan 44 has a discharge wind speed of 5 m / s. With the above configuration, the discharge port 44a, the square hole 47, and the space inside the stay 34 form a ventilation passage from the cross flow fan 44 of the blower.
【0067】次に作用を説明する。シャッター37は図
5,6の様に動作する。図5,6は本発明による熱定着
装置の縦断面図で、シャッター37の開閉動作の説明図
である。Next, the operation will be described. The shutter 37 operates as shown in FIGS. 5 and 6 are vertical sectional views of the heat fixing device according to the present invention, which are explanatory views of the opening / closing operation of the shutter 37.
【0068】ここで、図5は定着ローラ31の表面温度
が200℃以下、すなわち形状記憶バネ35の温度が2
00℃以下の場合である。この状態では、バネ36のバ
ネ力によってシャッター37が閉じられ、角穴47は閉
塞され、形状記憶バネ35が伸ばされる。そのため、定
着ローラ31にクロスフローファン44からの送風は行
われない。Here, in FIG. 5, the surface temperature of the fixing roller 31 is 200 ° C. or lower, that is, the temperature of the shape memory spring 35 is 2.
This is the case when the temperature is 00 ° C. or lower. In this state, the shutter 37 is closed by the spring force of the spring 36, the square hole 47 is closed, and the shape memory spring 35 is extended. Therefore, the cross flow fan 44 does not blow air to the fixing roller 31.
【0069】図6は定着ローラ31の表面温度が200
℃以上、すなわち形状記憶バネ35が200℃以上にな
った場合である。この状態では形状記憶バネ35は縮ま
ってこの力はバネ36のバネ力に打ち勝ちバネ36を伸
ばし、シャッター37を軸38を中心に回転して開く。
このため、定着ローラ31へ羽根車44eで吸込口44
bから吸込んだ空気はクロスフローファン44の吐出口
44aから開いている角穴47(47a〜47d)をと
おり、定着ローラ31への送風が行われる。In FIG. 6, the surface temperature of the fixing roller 31 is 200
This is the case where the temperature is higher than or equal to 0 ° C, that is, the shape memory spring 35 is higher than or equal to 200 ° C. In this state, the shape memory spring 35 contracts and this force overcomes the spring force of the spring 36 to extend the spring 36 and the shutter 37 is rotated about the shaft 38 to open.
For this reason, the suction port 44 is attached to the fixing roller 31 by the impeller 44e.
The air sucked from b passes through the square holes 47 (47a to 47d) opened from the discharge port 44a of the cross flow fan 44 and is blown to the fixing roller 31.
【0070】この様に、シャッター37(37a〜37
d)の4つは各々200℃を境界として開閉する。これ
により、定着ローラ表面が200℃を越えた部分は該当
するシャッター37(37a〜37d)は開き、クロス
フローファン44から該当する角穴47(47a〜47
d)を通じて送風され冷却され、200℃以下にもどろ
うとする作用をうける。In this way, the shutter 37 (37a-37)
Each of the four d) opens and closes at 200 ° C. as a boundary. As a result, the corresponding shutter 37 (37a to 37d) is opened in the portion where the surface of the fixing roller exceeds 200 ° C., and the corresponding square hole 47 (47a to 47) is opened from the cross flow fan 44.
The air is blown through d) and cooled, and it receives the action of returning to below 200 ° C.
【0071】この作用は、主に次の2つの場合で効果的
である。This action is effective mainly in the following two cases.
【0072】 小サイズ紙(日本工業規格紙の大きさ
B5,A4を縦長方向に定着装置を通紙する状態等)連
続通紙時(図4中紙端の符号B5R,A4R)の課題と
その解決 この場合、定着ローラ31の非通紙部は転写材への熱の
移動がないので、非通紙部の昇温が発生し、定着ローラ
31の表面温度が240℃を越えると、定着ローラ31
の表面コーティング、及び周辺部材の熱融解がおきる。
本装置でシャッター37を作動させない場合は非通紙部
温度は図7破線100の様に上昇するが、図7のSにシ
ャッター開を示すようにシャッター37c,37dが開
閉して実線101の様に200℃以下におさえることが
できる。Problems of small size paper (state in which the sizes B5 and A4 of Japanese Industrial Standard paper are passed through the fixing device in the lengthwise direction, etc.) and continuous paper passing (reference numerals B5R and A4R at the end of the paper in FIG. 4) and their problems Solution In this case, since heat is not transferred to the transfer material in the non-sheet passing portion of the fixing roller 31, if the temperature of the non-sheet passing portion rises and the surface temperature of the fixing roller 31 exceeds 240 ° C., the fixing roller 31 31
Surface coating and thermal melting of surrounding parts.
When the shutter 37 is not operated in this device, the temperature of the non-sheet passing portion rises as shown by the broken line 100 in FIG. 7, but as shown by the shutter open in S of FIG. 7, the shutters 37c and 37d are opened and closed and shown by the solid line 101. It can be kept below 200 ° C.
【0073】 スタンバイ状態から1枚目で、定着ロ
ーラ中央部での高温オフセットとその解決 本装置では、シャッター37がないと、スタンバイ放置
状態で定着ローラ31の長手方向端部では放熱が中央部
より大きいため、サーミスタで図4のBの位置が調温さ
れていても中央部分温度が高温(210〜220℃)に
なる。(図8破線102)ここで、複写機に用いられる
トナーでは200℃以上では高温オフセットが発生する
ことがわかっている。図8実線103はシャッター37
を備えた状態であり、シャッター37b,37cが開
(図の実線の下り勾配部)閉して定着ローラ31の表面
温度は180℃〜200℃となり、高温オフセットが防
止される。High temperature offset at the central portion of the fixing roller and its solution after the first sheet from the standby state. In the present apparatus, if the shutter 37 is not provided, the heat is radiated from the central portion in the longitudinal end portion of the fixing roller 31 in the standby state. Since it is large, the central portion temperature becomes high (210 to 220 ° C.) even if the position of B in FIG. 4 is adjusted by the thermistor. (Dashed line 102 in FIG. 8) Here, it is known that the toner used in the copying machine causes high temperature offset at 200 ° C. or higher. The solid line 103 in FIG.
In this state, the shutters 37b and 37c are opened (closed slope portion of the solid line in the figure) and closed, and the surface temperature of the fixing roller 31 becomes 180 ° C. to 200 ° C., and high temperature offset is prevented.
【0074】この様にして、従来の複写機で肉厚2mm
以下の定着ローラを用いるには、上記,の課題が残
されていたが、本発明では上述の如くこの課題を解消し
た。これによりウォームアップタイムの短縮、材料節
減、等の利点が生まれたのである。In this way, the thickness of the conventional copying machine is 2 mm.
When the following fixing roller is used, the above problems remain, but the present invention solves this problem as described above. As a result, advantages such as shorter warm-up time and material saving were born.
【0075】なお、本実施例では、シャッターが4ケ所
にあったが、より高精度の温調をする場合にはシャッタ
ーの数を増やしてもよく、また、条件がラフの場合は3
ケ所以下でも同様の効果が発生する。In the present embodiment, there were four shutters, but the number of shutters may be increased for more accurate temperature control, and if the conditions are rough, three shutters are required.
The same effect occurs even if the number of places is below.
【0076】また、シャッター開閉の応答性を向上させ
るために、形状記憶バネ35を黒色にすると定着ローラ
31からの放射熱を効果的に吸収するのでさらなる効果
がある。Further, if the shape memory spring 35 is made black in order to improve the responsiveness of opening and closing the shutter, the radiant heat from the fixing roller 31 is effectively absorbed, which is further effective.
【0077】「実施例4」図9,10は本発明の実施例
4である。複写機本体及び定着装置の構成は実施例3と
同じであり、シャッターの構成が異なるものであり、前
実施例3と同機能部分は同符号を付し説明を省略し、異
なるシャッター部分について説明する。[Fourth Embodiment] FIGS. 9 and 10 show a fourth embodiment of the present invention. The configurations of the copying machine main body and the fixing device are the same as those in the third embodiment, and the configurations of the shutters are different. The same functional portions as those in the previous third embodiment are designated by the same reference numerals, and the description thereof will be omitted. To do.
【0078】シャッター部は次の構成をとる。形状記憶
合金製のシャッター516とステンレス製の板バネ51
7を重ねてステー34の垂下部下縁近くに小ねじ518
により固定してある。シャッター516の下方は折り返
して曲げてあり、折り返して定着ローラ31に対向する
一面(図中A面)は定着ローラ31の表面に接近してお
り、該A面が定着ローラ31の表面温度にほぼ近い温度
になる様になっている。定着ローラ31の温度が200
℃以下ではシャッター516は図9の形状であり、角穴
47(47a〜47d)を夫々閉塞している。定着ロー
ラ31が200℃以上になるシャッター516は板バネ
517のバネ力に抗して図10のように折曲し、角穴4
7(47a〜47d)を開く。The shutter section has the following configuration. Shutter 516 made of shape memory alloy and leaf spring 51 made of stainless steel
7 and stack a small screw 518 near the lower edge of the hanging part of the stay 34.
Fixed by. The lower portion of the shutter 516 is folded back and bent, and one surface (A surface in the drawing) that is folded back and faces the fixing roller 31 is close to the surface of the fixing roller 31, and the A surface is almost at the surface temperature of the fixing roller 31. The temperature is close. The temperature of the fixing roller 31 is 200
At a temperature equal to or lower than ° C, the shutter 516 has the shape shown in Fig. 9 and closes the square holes 47 (47a to 47d). When the fixing roller 31 is heated to 200 ° C. or higher, the shutter 516 is bent against the spring force of the leaf spring 517 as shown in FIG.
7 (47a to 47d) are opened.
【0079】ここで、定着ローラ31の表面温度すなわ
ちシャッター516の温度が200℃以下の場合は板バ
ネ517の弾性により図9の如くシャッター閉の状態に
なる。また、定着ローラ31の表面温度すなわちシャッ
ター516の温度が200℃以上になると、シャッター
516の形状記憶能力により板バネ517のバネ力に抗
して図10の状態をとり、角穴47から離れる方向に根
本側が折曲し、シャッター開となり、クロスフローファ
ン44から定着ローラ31へ送風され、定着ローラ31
を冷却する。When the surface temperature of the fixing roller 31, that is, the temperature of the shutter 516 is 200 ° C. or lower, the elasticity of the leaf spring 517 causes the shutter to be closed as shown in FIG. When the surface temperature of the fixing roller 31, that is, the temperature of the shutter 516 becomes 200 ° C. or higher, the shape memory capacity of the shutter 516 resists the spring force of the leaf spring 517 to take the state of FIG. The base side is bent, the shutter is opened, and air is blown from the cross flow fan 44 to the fixing roller 31.
To cool.
【0080】この様にして、本実施例4においても実施
例3と同様の効果を得ることができる。In this way, the same effect as in the third embodiment can be obtained in the fourth embodiment.
【0081】また、A面を黒塗装すると熱吸収率が上が
り、さらに効果が上がる。また、ステー34をプラスッ
クスで構成すると放熱が防止され、さらに効果があるこ
とが確認されている。When the surface A is painted black, the heat absorption rate is increased, and the effect is further improved. Further, it has been confirmed that the stay 34 is made of plasx to prevent heat dissipation, which is more effective.
【0082】また、シャッター516を本実施例では形
状記憶合金で作っているが、これがバイメタルであって
も同様の作用をすることができる。Further, although the shutter 516 is made of a shape memory alloy in this embodiment, the same operation can be performed even if the shutter 516 is a bimetal.
【0083】実施例3,4は形状記憶バネ35、シャッ
ター516を直接定着ローラを覆うステー34に取付け
ているが、ステー34を非熱伝導性の材料とするか、形
状記憶バネ35、シャッター516とステー34間を断
熱性のある材料を介在させて形状記憶バネ35またはシ
ャッター516をステー34に取付けると、定着ローラ
31の放射熱が形状記憶バネ35またはシャッター51
6に、より忠実に伝えられ、制御がより正確となる。In the third and fourth embodiments, the shape memory spring 35 and the shutter 516 are directly attached to the stay 34 which covers the fixing roller. However, the stay 34 is made of a non-heat conductive material, or the shape memory spring 35 and the shutter 516 are used. When the shape memory spring 35 or the shutter 516 is attached to the stay 34 with a heat insulating material interposed between the stay 34 and the stay 34, the radiant heat of the fixing roller 31 causes the shape memory spring 35 or the shutter 51.
6 is more faithfully transmitted and the control is more accurate.
【0084】実施例3,4は複数の角穴47(47a〜
47d)としたが角穴47は定着ローラ31の全長にわ
たりほぼ一つとし、隣り合うシャッター37(37a〜
37d)を接近させてもよい。In the third and fourth embodiments, a plurality of square holes 47 (47a ...
47d), the number of the square holes 47 is almost one over the entire length of the fixing roller 31, and the adjacent shutters 37 (37a to 37a).
37d) may be brought closer.
【0085】[0085]
【発明の効果】以上説明したように (1) 像担持体に温風を送風して感光体の温度制御す
る構成にすることによって感光体に密封して面状発熱体
を設けた場合のように面状発熱体を感光体から離脱する
作業がないから像担持体の交換時の手間を少なくでき、
また、コストを安くすることができた。EFFECTS OF THE INVENTION As described above, (1) By providing warm air to the image carrier to control the temperature of the photosensitive member, it is possible to seal the photosensitive member with a planar heating element. Since there is no work to separate the planar heating element from the photoconductor, the labor for replacing the image carrier can be reduced,
Also, the cost could be reduced.
【0086】また、クリーニング手段を像担持体から離
脱するようにすると、上記において像担持体及びクリー
ニング手段を損傷することがない。If the cleaning means is detached from the image carrier, the image carrier and the cleaning means will not be damaged in the above.
【0087】また、非画像形成時に像担持体を回転さ
せ、かつクリーニング手段の離脱手段を動作させること
によって像担持体削れ、クリーニング手段への損傷がな
く像担持体表面温度分布のムラを除去することができる
効果がある。Further, by rotating the image carrier during non-image formation and operating the detaching means of the cleaning means, the image carrier is scraped, the cleaning means is not damaged, and the unevenness of the surface temperature distribution of the image carrier is removed. There is an effect that can be.
【0088】また上記の各々は有機光導電体のように寿
命の比較的短い感光層を備える像担持体を画像形成装置
に適用して好適である。Further, each of the above is suitable for applying an image carrier having a photosensitive layer having a relatively short life such as an organic photoconductor to an image forming apparatus.
【0089】尚、クリーニング器の離脱手段を有するこ
とによってオゾン、飛び散ったトナーなどの排出をスム
ーズにすることができた。It should be noted that the provision of the cleaning device removing means made it possible to smoothly discharge ozone, scattered toner, and the like.
【0090】また、送風手段が放電手段により発生する
不用物を除去する手段と共用されていると、オゾン、飛
散トナー等が速やかに除去され、感光体及び放電手段の
耐久性を増大する。Further, if the blowing means is also used as a means for removing the unnecessary substances generated by the discharging means, ozone, scattered toner, etc. are promptly removed, and the durability of the photoconductor and the discharging means is increased.
【0091】また、像担持体を移動させ乍ら送風手段を
働かせると像担持体が均一な温度に調温される。When the image carrier is moved and air blowing means is operated, the temperature of the image carrier is adjusted to a uniform temperature.
【0092】また、非画像形成時にクリーニング手段を
像担持体から離脱しておくと像担持体の非画像形成時に
おける移動による像担持体及びクリーニング手段の寿命
短縮ということがなくなり、耐久性を増す。If the cleaning means is separated from the image carrier during non-image formation, the life of the image carrier and the cleaning means will not be shortened due to movement of the image carrier during non-image formation, and the durability will be increased. .
【0093】(2) 定着ローラの表面温度を、熱反応
変形部材(形状記憶合金、バイメタル等)で検出し、そ
の形状変化により風遮断部材が送風機から定着ローラへ
の送風通路を開き、送風機から定着ローラに送風するこ
とにより、定着ローラの部分的な昇温を防ぐことができ
る。(2) The surface temperature of the fixing roller is detected by a thermal reaction deformation member (shape memory alloy, bimetal, etc.), and the shape change causes the wind blocking member to open the air passage from the air blower to the fixing roller, so that the air blower blows the air. By blowing air to the fixing roller, it is possible to prevent a partial temperature rise of the fixing roller.
【0094】また、上記において熱反応変形部材が風遮
断部材を兼ねると構成が簡単で、信頼性が高まり、コス
トが安くなる。If the heat-reaction deforming member also serves as the wind blocking member in the above, the structure is simple, the reliability is improved, and the cost is reduced.
【0095】また、上記何れかにおいて熱反応変形部材
が形状記憶合金とすると送風通路を大きくするのが容易
である。Further, in any of the above, if the heat-reactive deformation member is a shape memory alloy, it is easy to enlarge the air passage.
【0096】また、熱反応変形部材がバイメタルである
と定着ローラの温度変化に従って送風通路の開度が変化
し正確に送風通路が開閉される。If the heat-reaction deforming member is a bimetal, the opening of the air passage changes according to the temperature change of the fixing roller, and the air passage is opened and closed accurately.
【0097】また、熱反応変形部材の少くとも一部を黒
色にすると定着ローラの放射熱をよく吸収するので風遮
断部材の反応等が早い。Further, if at least a part of the heat-reaction deforming member is made black, the radiation heat of the fixing roller is well absorbed, so that the reaction of the wind blocking member is fast.
【0098】また、熱反応変形部材が熱伝導率の低い部
材を介して他の部材と係合すると、熱反応部材に定着ロ
ーラから加えられた放射熱が逃げず昇温時におくれなく
反応する。Further, when the thermal reaction deformation member engages with another member through the member having a low thermal conductivity, the radiant heat applied from the fixing roller to the thermal reaction member does not escape and reacts without delay when the temperature rises.
【0099】そのため、従来よりも薄肉の定着ローラを
使えるようになり、 ウエイトタイムの短縮 定着ローラ材料の節減 をする効果がある。Therefore, it becomes possible to use a fixing roller which is thinner than before, and it is effective in shortening the wait time and saving the material of the fixing roller.
【図1】本発明の第1の実施例に係る画像形成装置の概
略縦断面図である。FIG. 1 is a schematic vertical sectional view of an image forming apparatus according to a first embodiment of the present invention.
【図2】本発明の第2の実施例に係る画像形成装置の概
略縦断面図である。FIG. 2 is a schematic vertical sectional view of an image forming apparatus according to a second embodiment of the present invention.
【図3】本発明の第2及び第3の実施例に係る画像形成
装置の一部の縦断面図である。FIG. 3 is a vertical cross-sectional view of a part of the image forming apparatus according to the second and third embodiments of the present invention.
【図4】本発明の実施例3の斜視図である。FIG. 4 is a perspective view of a third embodiment of the present invention.
【図5】図4の作用を示す縦断面図である。5 is a vertical cross-sectional view showing the operation of FIG.
【図6】図4の作用を示す縦断面図である。FIG. 6 is a vertical sectional view showing the operation of FIG.
【図7】定着ローラ非通紙部の温度変化を示す線図であ
る。FIG. 7 is a diagram showing a temperature change of a non-sheet passing portion of a fixing roller.
【図8】スタンバイ時の定着ローラ中央部の温度変化を
示す線図である。FIG. 8 is a diagram showing a temperature change in the central portion of the fixing roller during standby.
【図9】他の実施例4の縦断面図である。FIG. 9 is a vertical sectional view of another embodiment 4;
【図10】他の実施例4の作用を示す縦断面図てある。FIG. 10 is a vertical sectional view showing the operation of another embodiment 4.
1 感光ドラム 2 コロナ放電器 3 送風ファン 10 クリーニング器 22 温度センサ 31 定着ローラ 32 ギヤ 33,39 側板 34 ステー 35 形状記憶バネ 36 バネ 37 シャッター 38 軸 1 Photosensitive Drum 2 Corona Discharger 3 Blower Fan 10 Cleaning Device 22 Temperature Sensor 31 Fixing Roller 32 Gears 33, 39 Side Plate 34 Stay 35 Shape Memory Spring 36 Spring 37 Shutter 38 Shaft
───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.5 識別記号 庁内整理番号 FI 技術表示箇所 G12B 1/00 S 6843−2F ─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. 5 Identification number Office reference number FI technical display location G12B 1/00 S 6843-2F
Claims (13)
該像担持体の温度を測定する温度測定手段とを有し、該
温度測定手段による測定結果に応じて前記送風手段を制
御することを特徴すとする画像形成装置。1. An air blowing unit for blowing warm air to the image carrier,
An image forming apparatus comprising: a temperature measuring unit that measures the temperature of the image carrier, and controlling the air blowing unit according to a measurement result of the temperature measuring unit.
該像担持体の温度を測定する温度測定手段と、所定タイ
ミングでクリーニング手段を像担持体から離脱する離脱
手段とを有し、該温度測定手段による測定結果に応じて
前記送風手段を制御することを特徴とする画像形成装
置。2. An air blowing unit for blowing warm air to the image carrier,
A temperature measuring unit for measuring the temperature of the image carrier and a detaching unit for detaching the cleaning unit from the image carrier at a predetermined timing, and controlling the blower unit according to the measurement result of the temperature measuring unit. An image forming apparatus characterized by.
せる離脱手段を有し、所定タイミングで該像担持体を移
動させ、かつ該クリーニング手段及び離脱手段を動作さ
せることを特徴とする画像形成装置。3. An image forming apparatus, comprising: a detaching unit for detaching the cleaning unit from the image carrier, moving the image carrier at a predetermined timing, and operating the cleaning unit and the detaching unit.
層を設けた電子写真感光体である請求項1又は2に記載
の画像形成装置。4. The image forming apparatus according to claim 1, wherein the image bearing member is an electrophotographic photosensitive member provided with a photosensitive layer containing an organic photoconductor.
物を除去する除去手段を共用とする請求項1又は2に記
載の画像形成装置。5. The image forming apparatus according to claim 1, wherein the air blowing unit shares the removing unit that removes unnecessary substances generated by the discharging unit.
動させる手段を有する請求項1又は2に記載の画像形成
装置。6. The image forming apparatus according to claim 1, further comprising means for moving the image carrier when controlling the blowing means.
るタイミングが非画像形成時である請求項2に記載の画
像形成装置。7. The image forming apparatus according to claim 2, wherein the cleaning unit is detached from the image carrier at a non-image forming timing.
と、該定着ローラに送風する送風機と、送風機から定着
ローラの長手方向の夫々の個所へ送風可能な複数の送風
通路と、複数の送風通路に夫々設けられ、該送風通路を
開く位置と遮断する位置をとることのできる可動の風遮
断部材と、少くとも一部分が該定着ローラの近傍にあ
り、温度に応じて形を変えることができて、該風遮断部
材と係合する熱反応変形部材と、該風遮断部材を送風通
路を遮断する方向へ付勢する弾性部材とを有し、該熱反
応変形部材が所定の温度以上になると該熱反応変形部材
が該風遮断部材を送風機から定着ローラへの送風通路を
開く位置に移動させることを特徴とする熱定着装置。8. A fixing roller, heating means for the fixing roller, a blower for blowing air to the fixing roller, a plurality of blowing passages capable of blowing air from the blower to respective portions in the longitudinal direction of the fixing roller, and a plurality of blowing fans. Movable air blocking members, which are respectively provided in the passages and can take a position to block the air passage and a position to block the air passage, and at least a part of the member is near the fixing roller, and the shape can be changed according to the temperature. A heat-reaction deforming member that engages with the wind-blocking member and an elastic member that biases the wind-blocking member in a direction of blocking the air passage, and when the heat-reaction-deforming member reaches a predetermined temperature or higher. A thermal fixing device, wherein the thermal reaction deformation member moves the wind blocking member to a position where an air passage from the blower to the fixing roller is opened.
ることを特徴とする請求項8に記載の熱定着装置。9. The heat fixing device according to claim 8, wherein the heat reaction deformation member also serves as the wind blocking member.
ることを特徴とする請求項8又は9に記載の熱定着装
置。10. The heat fixing device according to claim 8, wherein the heat-reactive deformation member is a shape memory alloy.
ことを特徴とする請求項8に記載の熱定着装置。11. The heat fixing device according to claim 8, wherein the heat reaction deformation member is a bimetal.
黒色であることを特徴とする請求項8から11の何れか
1つに記載の熱定着装置。12. The heat fixing device according to claim 8, wherein at least a part of the heat-reaction deforming member is black.
材を介して他の部材と係合することを特徴とする請求項
8から12の何れか1つに記載の熱定着装置。13. The heat fixing device according to claim 8, wherein the heat reaction deformation member engages with another member via a member having a low heat conductivity.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP4194825A JPH0619246A (en) | 1992-06-29 | 1992-06-29 | Image forming device and heat fixing-device |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP4194825A JPH0619246A (en) | 1992-06-29 | 1992-06-29 | Image forming device and heat fixing-device |
Publications (1)
Publication Number | Publication Date |
---|---|
JPH0619246A true JPH0619246A (en) | 1994-01-28 |
Family
ID=16330886
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP4194825A Pending JPH0619246A (en) | 1992-06-29 | 1992-06-29 | Image forming device and heat fixing-device |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPH0619246A (en) |
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO1997014546A1 (en) * | 1995-10-13 | 1997-04-24 | Arcotec Oberflächentechnik Gmbh | Device for treating flat substrates by a corona station |
JP2007003731A (en) * | 2005-06-22 | 2007-01-11 | Ricoh Co Ltd | Image forming apparatus |
US7181156B2 (en) | 2003-07-25 | 2007-02-20 | Ricoh Company, Ltd. | Image forming apparatus using a cleaning member for preventing noises and process cartridge therefor |
JP2010256747A (en) * | 2009-04-28 | 2010-11-11 | Ricoh Co Ltd | Photoreceptor characteristic evaluation device |
US7890014B2 (en) | 2005-09-13 | 2011-02-15 | Canon Kabushiki Kaisha | Image forming apparatus with air blowing device for cooling rotary member |
US7941070B2 (en) | 2006-02-24 | 2011-05-10 | Kyocera Corporation | Electrophotographic photosensitive member and image forming apparatus using same |
-
1992
- 1992-06-29 JP JP4194825A patent/JPH0619246A/en active Pending
Cited By (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO1997014546A1 (en) * | 1995-10-13 | 1997-04-24 | Arcotec Oberflächentechnik Gmbh | Device for treating flat substrates by a corona station |
US6099810A (en) * | 1995-10-13 | 2000-08-08 | Arcotec Oberflachentechnik Gmbh | Device for treating flat substrates by a corona station |
US7181156B2 (en) | 2003-07-25 | 2007-02-20 | Ricoh Company, Ltd. | Image forming apparatus using a cleaning member for preventing noises and process cartridge therefor |
US7295802B2 (en) | 2003-07-25 | 2007-11-13 | Ricoh Company, Ltd | Image forming apparatus using a cleaning unit for preventing noises |
JP2007003731A (en) * | 2005-06-22 | 2007-01-11 | Ricoh Co Ltd | Image forming apparatus |
US7890014B2 (en) | 2005-09-13 | 2011-02-15 | Canon Kabushiki Kaisha | Image forming apparatus with air blowing device for cooling rotary member |
US8086131B2 (en) | 2005-09-13 | 2011-12-27 | Cannon Kabushiki Kaisha | Image forming apparatus |
US7941070B2 (en) | 2006-02-24 | 2011-05-10 | Kyocera Corporation | Electrophotographic photosensitive member and image forming apparatus using same |
JP2010256747A (en) * | 2009-04-28 | 2010-11-11 | Ricoh Co Ltd | Photoreceptor characteristic evaluation device |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
US9411275B2 (en) | Image forming apparatus having partition configured to separate air flow and sheet feeding paths | |
US8989616B2 (en) | Image forming apparatus | |
JP3895055B2 (en) | Fixing device | |
US7286784B2 (en) | Image forming apparatus and process cartridge | |
JPH0619246A (en) | Image forming device and heat fixing-device | |
JP2001228742A (en) | Image forming device, fixing device and its temperature control method | |
JP2013088769A (en) | Image forming apparatus | |
JPH0764422A (en) | Fixing device | |
JPH10307526A (en) | Photoreceptor temperature controller for image forming device | |
JP2002123119A (en) | Fixing device and image forming device | |
JPH0728356A (en) | Image forming device | |
JP2004361626A (en) | Image forming apparatus | |
JP4765797B2 (en) | Image forming apparatus and transfer apparatus | |
JP4172252B2 (en) | Fixing apparatus and image forming apparatus | |
JPH0318867A (en) | Image forming device | |
JP2023164055A (en) | Image forming apparatus | |
JPH06161199A (en) | Electrophotographic recording device | |
JP2004151476A (en) | Image forming apparatus | |
JP2004341398A (en) | Image forming apparatus | |
JP2004163548A (en) | Image forming apparatus | |
JPH03139682A (en) | Fixing device | |
JP2021043238A (en) | Charging device and image forming apparatus using the same | |
JPH08202183A (en) | Fixing device | |
JPS62206574A (en) | Fixing device | |
JP2004184700A (en) | Image forming apparatus |