JPH08202190A - Fixing equipment for image forming device - Google Patents

Fixing equipment for image forming device

Info

Publication number
JPH08202190A
JPH08202190A JP1391695A JP1391695A JPH08202190A JP H08202190 A JPH08202190 A JP H08202190A JP 1391695 A JP1391695 A JP 1391695A JP 1391695 A JP1391695 A JP 1391695A JP H08202190 A JPH08202190 A JP H08202190A
Authority
JP
Japan
Prior art keywords
fixing roller
roller
fixing
bearing
image forming
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
Application number
JP1391695A
Other languages
Japanese (ja)
Inventor
Tetsuya Mitsuyasu
哲也 光安
Masahiko Nose
正彦 野瀬
Isao Yamazaki
山崎  功
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Panasonic Holdings Corp
Original Assignee
Matsushita Electric Industrial Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Matsushita Electric Industrial Co Ltd filed Critical Matsushita Electric Industrial Co Ltd
Priority to JP1391695A priority Critical patent/JPH08202190A/en
Publication of JPH08202190A publication Critical patent/JPH08202190A/en
Pending legal-status Critical Current

Links

Landscapes

  • Fixing For Electrophotography (AREA)
  • Control Of Resistance Heating (AREA)

Abstract

PURPOSE: To prevent firing and fume from occurring caused by excessive heating not by using parts detecting the surface temperature of a fixing roller but by utilizing the thermal deformation temperature of a bearing. CONSTITUTION: When the surface temperature of the first fixing roller 1 heated by a heater lamp 3 becomes abnormally high, the bearing 8 is started to be melted and the roller 1 receiving pressing force Q through the second fixing roller 2 is started to be moved in an identical direction to the pressing force Q. By the roller 1 which is started to be moved in the identical direction to the pressing force Q, heat resistant resin 20 applied to the upper part of the roller 1 is pushed up and a tangent point between an iron plate 17 and a leaf spring 19 is removed. Thus, a current is stopped being supplied to a heat roller 3 from a current supply device 18 and the lamp 3 is also stopped being heated. As the result, the current is stopped being supplied to the roller 1 and the firing and the fume are prevented from occurring caused by the excessive heating.

Description

【発明の詳細な説明】Detailed Description of the Invention

【0001】[0001]

【産業上の利用分野】本発明は、電子写真方式のプリン
タや複写機などの画像形成装置の定着器に関するもので
ある。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fixing device for an image forming apparatus such as an electrophotographic printer or a copying machine.

【0002】[0002]

【従来の技術】電子写真方式のプリンタや複写機などの
画像形成装置には、転写されたトナー像を用紙上に熱と
圧着力により溶融定着させる定着ローラを備えた定着器
が備えられている。
2. Description of the Related Art An image forming apparatus such as an electrophotographic printer or a copying machine is provided with a fixing device having a fixing roller for fusing and fixing a transferred toner image on a sheet by heat and pressure. .

【0003】図4は従来の画像形成装置の定着器の断面
図である。図4において1は第1の定着ローラ、2は第
2の定着ローラであって互いに圧着している。少なくと
も一方の例えば第1の定着ローラ1には加熱手段として
のヒータランプ3が内蔵されている。第1及び第2の定
着ローラ1,2の周面はシリコンゴム4,5でコーティ
ングされている。また第1及び第2の定着ローラ1,2
の両端部のボス6,7は軸受8,9に回転自在に軸支さ
れている。
FIG. 4 is a sectional view of a fixing device of a conventional image forming apparatus. In FIG. 4, 1 is a first fixing roller and 2 is a second fixing roller, which are pressed against each other. At least one of the first fixing rollers 1, for example, has a built-in heater lamp 3 as heating means. The peripheral surfaces of the first and second fixing rollers 1 and 2 are coated with silicone rubbers 4 and 5. In addition, the first and second fixing rollers 1 and 2
The bosses 6 and 7 on both ends of the bearing are rotatably supported by bearings 8 and 9.

【0004】11は軸受7の下部に配設されたレバーで
あって、その一端部はピン12に回転自在に軸着されて
いる。レバー11の自由端部には段ねじ13のねじ部1
3aが螺着されている。14は段ねじ13に装着された
コイルばねであり、止板15,16の間に配設されてい
る。コイルばね14は圧縮ばねであり、矢印Q方向にば
ね力を有している。
Reference numeral 11 denotes a lever arranged below the bearing 7, one end of which is rotatably attached to a pin 12. At the free end of the lever 11, the threaded portion 1 of the step screw 13
3a is screwed. A coil spring 14 is attached to the step screw 13, and is arranged between the stop plates 15 and 16. The coil spring 14 is a compression spring and has a spring force in the arrow Q direction.

【0005】また、軸受8には耐熱樹脂を用いることが
多く、ヒータランプ3によって加熱された第1の定着ロ
ーラ1の表面温度が軸受8の熱変形温度を超えると、軸
受8の溶融が始まり、レバー11を利用した第2の定着
ローラ2によって付勢力を受けた第1の定着ローラ1は
軸受8の保持不可能により正常な定着を行うことができ
ず、且つ加熱手段としてのヒータランプ3への電流供給
は継続されたままで、異常高温状態も継続される。
Further, a heat-resistant resin is often used for the bearing 8, and when the surface temperature of the first fixing roller 1 heated by the heater lamp 3 exceeds the thermal deformation temperature of the bearing 8, melting of the bearing 8 starts. The first fixing roller 1 which is biased by the second fixing roller 2 using the lever 11 cannot perform normal fixing because the bearing 8 cannot be held, and the heater lamp 3 as a heating unit. The current is continuously supplied to the device, and the abnormally high temperature condition is also maintained.

【0006】[0006]

【発明が解決しようとする課題】しかしながら上記従来
の構成では、この異常高温状態を避けるためにバイメタ
ル式サーモスタットまたは温度ヒューズ等、第1の定着
ローラ1等の表面温度を検知することにより電流供給を
遮断する部品を用いている。この場合コスト高であり、
また部品自体の熱容量があるため応答性が悪く近年の定
着装置ウォームアップタイム短縮化の傾向に対し大きな
マイナス要因となるという問題点を有していた。
However, in the above-described conventional configuration, in order to avoid this abnormally high temperature state, the current supply is performed by detecting the surface temperature of the first fixing roller 1 such as a bimetal type thermostat or a thermal fuse. It uses a blocking component. In this case the cost is high,
Further, the heat capacity of the components themselves causes poor responsiveness, which is a major negative factor against the recent trend of shortening the warm-up time of the fixing device.

【0007】そこで本発明は、定着ローラの表面温度を
検知する部品を用いず、軸受の熱変形温度を利用するこ
とにより定着ローラの異常高温状態時に加熱手段への電
流の供給を阻止することができる画像形成装置の定着器
を提供することを目的とする。
In view of this, the present invention does not use a component for detecting the surface temperature of the fixing roller but utilizes the heat deformation temperature of the bearing to prevent the supply of current to the heating means when the fixing roller is in an abnormally high temperature state. An object of the present invention is to provide a fixing device of an image forming apparatus that can be used.

【0008】[0008]

【課題を解決するための手段】本発明は上記目的を達成
するために、第1の定着ローラに内蔵されてこの第1の
定着ローラを加熱する加熱手段と、第2の定着ローラを
第1の定着ローラの方向に付勢する付勢手段と、この付
勢手段によって付勢された第2の定着ローラより受ける
付勢力に反し第1の定着ローラ両端部を保持する軸受
と、加熱手段による加熱によって第1の定着ローラが所
定温度に達したときに、軸受が溶融し付勢手段による第
2の定着ローラの付勢力によって第1の定着ローラが付
勢方向へ移動することによって、加熱手段へのエネルギ
ーの供給を阻止する阻止手段とを配設したものである。
In order to achieve the above object, the present invention provides a first fixing roller with a heating means for heating the first fixing roller and a second fixing roller. Of the first fixing roller against the biasing force of the second fixing roller, which is biased by the biasing means, and the heating means. When the first fixing roller reaches a predetermined temperature by heating, the bearing is melted and the biasing force of the second fixing roller moves the first fixing roller in the biasing direction, thereby heating the heating unit. And a blocking means for blocking the supply of energy to.

【0009】[0009]

【作用】本発明は上記構成により定着ローラの表面温度
を検知する部品を用いず、軸受の熱変形温度を利用する
ことにより定着ローラの異常高温状態時に加熱手段への
電流の供給を阻止することができ、過度の加熱による発
火・発煙を防止できる。
According to the present invention, the structure for detecting the surface temperature of the fixing roller is not used, but the heat deformation temperature of the bearing is utilized to prevent the supply of the electric current to the heating means when the fixing roller is in an abnormally high temperature state. It is possible to prevent ignition and smoking due to excessive heating.

【0010】[0010]

【実施例】図1は本発明の一実施例における画像形成装
置の定着器の側面図、図2は本発明の一実施例における
画像形成装置の定着器の図1に示す軸受部の断面図であ
る。図3は本発明の一実施例における画像形成装置の定
着器を用いた電子写真方式の印字装置としてのLEDプ
リンタの断面図である。図4に示す従来のものと同一構
成部品には同一符号を付している。
1 is a side view of a fixing device of an image forming apparatus according to an embodiment of the present invention, and FIG. 2 is a sectional view of a bearing portion shown in FIG. 1 of the fixing device of the image forming apparatus according to an embodiment of the present invention. Is. FIG. 3 is a sectional view of an LED printer as an electrophotographic printing apparatus using a fixing device of an image forming apparatus according to an embodiment of the present invention. The same components as those of the conventional one shown in FIG. 4 are designated by the same reference numerals.

【0011】まず、図3によりLEDプリンタの動作に
ついて説明する。21は像担持体としての感光体ドラ
ム、22は感光体ドラム21表面を一様電位に帯電する
コロナ帯電部である。23は一様電位に帯電された感光
体ドラム21表面に外部機器からの印字データに基づき
展開された信号に基づき潜像を形成するLED光源から
なる露光部、24は感光体ドラム21上に形成された静
電潜像を磁性トナーにより顕画化しトナー像にする現像
スリーブ25、トナー搬送用パドル26a,26b、補
給用の磁性トナーを収納したトナーカートリッジ27な
どを現像ハウジング28内に納めた現像ユニット、29
は用紙収納部(図示せず)から給紙されてきた用紙30
上にトナー像を転写する転写部、31は転写後の感光体
ドラム21上に残留した磁性トナーをはぎ取るクリーニ
ングブレード、32は感光体ドラム21上の残留電位を
除電する除電部、33は用紙30に転写されたトナー像
を熱定着する定着部である。
First, the operation of the LED printer will be described with reference to FIG. Reference numeral 21 is a photosensitive drum as an image bearing member, and 22 is a corona charging unit that charges the surface of the photosensitive drum 21 to a uniform potential. Reference numeral 23 denotes an exposure unit formed of an LED light source that forms a latent image on the surface of the photosensitive drum 21 charged to a uniform potential based on a signal developed based on print data from an external device, and 24 is formed on the photosensitive drum 21. Development in which a developing sleeve 25 that visualizes the formed electrostatic latent image with a magnetic toner to form a toner image, toner transfer paddles 26a and 26b, and a toner cartridge 27 that stores magnetic toner for replenishment are contained in a developing housing 28. Unit, 29
Is a sheet of paper 30 fed from a paper storage unit (not shown)
A transfer unit for transferring the toner image onto the upper surface, a cleaning blade 31 for removing the magnetic toner remaining on the photosensitive drum 21 after the transfer, a static eliminator for neutralizing the residual potential on the photosensitive drum 21, and a paper 33. It is a fixing unit for thermally fixing the toner image transferred to the.

【0012】以下にLEDプリンタの印字動作を説明す
る。展開部(図示せず)によってドットマトリクスデー
タに展開された外部機器から送られてきたデータは、プ
リンタ部に送られ露光部23によって感光体ドラム21
表面に静電潜像として形成される。形成された静電潜像
は感光体ドラム21の回転(矢印A方向)と共に、現像
スリーブ25と現像スリーブ25表面に形成されたキャ
リアによる磁気ブラシによって運ばれた磁性トナーが静
電潜像に付着しトナー像となる。このトナー像は、感光
体ドラム21の回転にともない転写部29に達する。こ
こで、像形成に同期して用紙収納部から搬送されてきた
用紙30表面にトナー像が転写部29の電界によって引
きつけられ転写される。転写された用紙30は定着部3
3に搬送されトナー像は用紙30に加熱定着される。
The printing operation of the LED printer will be described below. The data sent from the external device, which has been expanded into dot matrix data by the expansion unit (not shown), is sent to the printer unit and is exposed by the exposure unit 23 to the photosensitive drum 21.
An electrostatic latent image is formed on the surface. The formed electrostatic latent image is rotated by the photosensitive drum 21 (in the direction of arrow A), and the magnetic toner carried by the magnetic brush formed by the developing sleeve 25 and the carrier formed on the surface of the developing sleeve 25 is attached to the electrostatic latent image. And becomes a toner image. This toner image reaches the transfer portion 29 as the photosensitive drum 21 rotates. Here, the toner image is attracted and transferred by the electric field of the transfer unit 29 onto the surface of the paper 30 conveyed from the paper storage unit in synchronization with the image formation. The transferred sheet 30 has a fixing unit 3
The toner image conveyed to the sheet 3 is heated and fixed on the sheet 30.

【0013】次に、図1,図2を用い本発明の定着器の
構造について説明する。1は第1の定着ローラ、2は第
2の定着ローラであり、3は第1の定着ローラ1を加熱
するためのヒータランプ、8は第1の定着ローラ1を回
転自在に軸支する軸受、17はヒータランプ3に接続さ
れた導通可能な鉄板であり、18はヒータランプ3に供
給される電流供給装置であり、19は電流供給装置18
に接続された板ばねであり、20は板ばね19の下部に
設けられた熱硬化性に優れた耐熱樹脂である。
Next, the structure of the fixing device of the present invention will be described with reference to FIGS. Reference numeral 1 is a first fixing roller, 2 is a second fixing roller, 3 is a heater lamp for heating the first fixing roller 1, and 8 is a bearing that rotatably supports the first fixing roller 1. , 17 are conductive iron plates connected to the heater lamp 3, 18 is a current supply device supplied to the heater lamp 3, and 19 is a current supply device 18.
And 20 is a heat-resistant resin provided under the leaf spring 19 and having excellent thermosetting properties.

【0014】第2の定着ローラ2にはバネ等の付勢装置
により矢印方向の付勢力Qがかかっており、この付勢力
Qによって第1の定着ローラ1と第2の定着ローラ2と
が圧接している。
An urging force Q in the direction of the arrow is applied to the second fixing roller 2 by an urging device such as a spring, and the first fixing roller 1 and the second fixing roller 2 are pressed against each other by this urging force Q. are doing.

【0015】通常、上記の状態では転写されたトナー像
を用紙30上に熱と圧着力により溶融定着させることに
より定着を行うが、ヒータランプ3によって加熱された
第1の定着ローラ1の表面温度が軸受8の熱変形温度を
超えるいわゆる異常高温状態となった場合、軸受8は溶
融を開始し、このとき第2の定着ローラ2を介して付勢
力Qを受けている第1の定着ローラ1は付勢力Qと同じ
方向へ移動を始める。この付勢力Qと同方向へ移動し始
めた第1の定着ローラ1は第1の定着ローラ1の上部に
つけられた耐熱樹脂20を押し上げ、鉄板17と板ばね
19の接点を外すことになる。これによりヒートローラ
3への電流供給装置18からの電流供給は停止され、ヒ
ータランプ3の加熱も停止する。これらによって第1の
定着ローラ1の異常高温状態時に自動的に電流の供給を
停止し、過度の加熱による発火・発煙を防止する。
Normally, in the above state, the transferred toner image is fused and fixed on the sheet 30 by heat and pressure, but the surface temperature of the first fixing roller 1 heated by the heater lamp 3 is fixed. When the bearing 8 is in a so-called abnormally high temperature state in which it exceeds the thermal deformation temperature of the bearing 8, the bearing 8 starts melting, and at this time, the first fixing roller 1 which receives the urging force Q via the second fixing roller 2 Starts moving in the same direction as the biasing force Q. The first fixing roller 1 having started to move in the same direction as the urging force Q pushes up the heat resistant resin 20 attached to the upper portion of the first fixing roller 1 and removes the contact point between the iron plate 17 and the leaf spring 19. As a result, the current supply from the current supply device 18 to the heat roller 3 is stopped, and the heating of the heater lamp 3 is also stopped. By these, the supply of electric current is automatically stopped when the first fixing roller 1 is in an abnormally high temperature state to prevent ignition and smoking due to excessive heating.

【0016】[0016]

【発明の効果】本発明では定着ローラの表面温度を検知
する部品を用いず、軸受の熱変形温度を利用することに
より定着ローラの異常高温状態時に加熱手段への電流の
供給を阻止することができ、過度の加熱による発火・発
煙を防止できる。
According to the present invention, the component for detecting the surface temperature of the fixing roller is not used, but the heat deformation temperature of the bearing is used to prevent the supply of the electric current to the heating means when the fixing roller is in an abnormally high temperature state. It is possible to prevent ignition and smoke due to excessive heating.

【図面の簡単な説明】[Brief description of drawings]

【図1】本発明の一実施例における画像形成装置の定着
器の側面図
FIG. 1 is a side view of a fixing device of an image forming apparatus according to an embodiment of the present invention.

【図2】本発明の一実施例における画像形成装置の定着
器の図1に示す軸受部の断面図
FIG. 2 is a sectional view of a bearing portion shown in FIG. 1 of a fixing device of an image forming apparatus according to an embodiment of the present invention.

【図3】本発明の一実施例における画像形成装置の定着
器を用いた電子写真方式の印字装置としてのLEDプリ
ンタの断面図
FIG. 3 is a cross-sectional view of an LED printer as an electrophotographic printing device using a fixing device of an image forming apparatus according to an embodiment of the present invention.

【図4】従来の画像形成装置の定着器の断面図FIG. 4 is a sectional view of a fixing device of a conventional image forming apparatus.

【符号の説明】[Explanation of symbols]

1 第1の定着ローラ 2 第2の定着ローラ 3 ヒータランプ 8 軸受 9 軸受 18 電流供給装置 19 板ばね 20 耐熱樹脂 21 感光体ドラム 22 コロナ帯電部 23 露光部 24 現像ユニット 25 現像スリーブ 26a,26b トナー搬送用パドル 27 トナーカートリッジ 28 現像ハウジング 29 転写部 30 用紙 31 クリーニングブレード 32 除電部 33 定着部 1 First Fixing Roller 2 Second Fixing Roller 3 Heater Lamp 8 Bearing 9 Bearing 18 Current Supply Device 19 Leaf Spring 20 Heat Resistant Resin 21 Photoreceptor Drum 22 Corona Charging Part 23 Exposure Part 24 Developing Unit 25 Developing Sleeve 26a, 26b Toner Transport paddle 27 Toner cartridge 28 Developing housing 29 Transfer unit 30 Paper 31 Cleaning blade 32 Static eliminator 33 Fixing unit

Claims (1)

【特許請求の範囲】[Claims] 【請求項1】両端部を回転自在に軸支された第1の定着
ローラ及び第2の定着ローラと、前記第1の定着ローラ
に内蔵されて該第1の定着ローラを加熱する加熱手段
と、前記第2の定着ローラを前記第1の定着ローラの方
向に付勢する付勢手段と、前記付勢手段によって付勢さ
れた前記第2の定着ローラより受ける付勢力に反し前記
第1の定着ローラ両端部を保持する軸受と、前記加熱手
段による加熱によって前記第1の定着ローラが所定温度
に達したときに、前記軸受が溶融し前記付勢手段による
第2の定着ローラの付勢力によって前記第1の定着ロー
ラが付勢方向へ移動することによって、前記加熱手段へ
のエネルギーの供給を阻止する阻止手段とを設けたこと
を特徴とする画像形成装置の定着器。
1. A first fixing roller and a second fixing roller, both ends of which are rotatably supported, and heating means incorporated in the first fixing roller to heat the first fixing roller. , The first fixing roller against the biasing means for biasing the second fixing roller toward the first fixing roller and the second fixing roller biased by the biasing means. When the first fixing roller reaches a predetermined temperature due to the bearing holding both ends of the fixing roller and the heating by the heating means, the bearing is melted and the urging force of the second fixing roller is applied by the urging means. A fixing device for an image forming apparatus, comprising: a blocking unit that blocks the supply of energy to the heating unit by moving the first fixing roller in the biasing direction.
JP1391695A 1995-01-31 1995-01-31 Fixing equipment for image forming device Pending JPH08202190A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP1391695A JPH08202190A (en) 1995-01-31 1995-01-31 Fixing equipment for image forming device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP1391695A JPH08202190A (en) 1995-01-31 1995-01-31 Fixing equipment for image forming device

Publications (1)

Publication Number Publication Date
JPH08202190A true JPH08202190A (en) 1996-08-09

Family

ID=11846502

Family Applications (1)

Application Number Title Priority Date Filing Date
JP1391695A Pending JPH08202190A (en) 1995-01-31 1995-01-31 Fixing equipment for image forming device

Country Status (1)

Country Link
JP (1) JPH08202190A (en)

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