JPS59171981A - Heat fixing device - Google Patents

Abstract

PURPOSE:To form a direct heating type heat fixing device where electric conduction to a resistance heating body is possible by extending a resistance heating body layer up to the shaft end part of a metallic core and connecting a voltage source between an electrode provided on the surface of the resistance heating body layer in the shaft end part and the metallic core. CONSTITUTION:When a heat roll 1 and a pressure roll 2 which are pressed to each other are rotated by a driving means such as a motor, a gear, or the like and, for example, a commercial AC voltage is impressed to feeding brushes 14 and 14', a current is flowed to a resistance heating body layer 8 through an electrode film 9 and a hollow core 5. When the surface of the heat roll 1 reaches a prescribed fixing temperature, a supporting material 16 holding a toner image 15 is allowed to pass between the heat roll 1 and the pressure roll 2 to obtain a fixed image. By this heating device, one electrode can be omitted because it is used as an electrode of the hollow core 5 of the heat roll 1, and the feeding mechanism is simplified. Further, since the resistance heating body layer 8 extends to the range of the hollow core 5, the fall of temperature in both end parts of the roll is prevented to make the tempeature distribution in the axial direction on the surface of the heat roll uniform practically.

Description

【発明の詳細な説明】 本発明は電子写真複写機、ファクシミリ、プリンター等
の画像形成袋りにおいて、紙等の支持体上に形成された
トナー像を加熱ロールと加圧リールにより定石する加熱
定着装置に関する。DETAILED DESCRIPTION OF THE INVENTION The present invention is used in image forming bags for electrophotographic copying machines, facsimile machines, printers, etc., to fix a toner image formed on a support such as paper using a heating roll and a pressure reel. Regarding equipment.

画像形成袋ｂ２における定淘装瓢の一つとして、内部に
熱源（、赤外線ランプ、ハロゲンランプ、ニクロム線％
）を珊する良熱伝導性の免属コアの表面にシリコーンゴ
ム等の耐熱弾性体層やテフロン（商品名）等の離型性層
を被櫨してなる加熱ロールと加圧ロールとなぞなえた、
いわゆる熱ロール型の加熱定漸装りか知られでいる。As one of the standard equipment in the image forming bag b2, there is a heat source (infrared lamp, halogen lamp, nichrome wire) inside.
) A heat-resistant elastic layer such as silicone rubber or a releasable layer such as Teflon (trade name) is coated on the surface of a non-metallic core with good thermal conductivity. Got it,
A so-called thermo roll type heating constant loading system is known.

鳥 この机加熱定熱装甑においては、ロール内部の熱源の輻
射熱により空気を介してロール本俸を間接的に加熱して
いるため熱効率か悪く、加熱ロール表面が所定の定着温
度（通常は１５０〜１８０′Ｃ位）に達するまでの予熱
時間が長い（３〜５分栓度〕とり いう欠点かあった。そして予熱時間を短縮を図るタメ、
例えは特開［１５６−１２３５８１号公報や特開１ｊｉ
ｂ６−１３８７６６号公報等に記載されているようなセ
ラミックヒータ等の抵抗発熱体によりロール本俸をＩＬ
Ｌ拒加熱加熱ことか提案されている。Torikoko's desk-heating constant-heating device uses radiant heat from the heat source inside the roll to indirectly heat the roll through the air, resulting in poor thermal efficiency and the surface of the heating roll reaches a predetermined fixing temperature (usually 150~ There was a drawback that the preheating time to reach the temperature (approximately 180'C) was long (3 to 5 minutes).And in order to shorten the preheating time,
For example, Japanese Patent Application Publication No. 156-123581 and Japanese Patent Application Publication No. 1ji
The roll yield is controlled by a resistance heating element such as a ceramic heater as described in B6-138766, etc.
It has been proposed to call it L-rejection heating.

一般に、直接加熱型の加熱足糸装置においては抵抗光熱
体に電圧（一般には商用交流′電圧）を印加するために
、その周面に銅合金等の′電極膜を魚ルや溶射等の手段
により形成し、この電極膜をカーボン等の給電ブラシを
介して電圧源に接続しているか、給電機構の簡素化か求
められている。Generally, in a direct heating type heating byssus device, in order to apply a voltage (generally a commercial AC voltage) to the resistive photothermal element, an electrode film of copper alloy or the like is coated on the circumferential surface of the resistive photothermal element by means such as a coil or thermal spraying. There is a need to simplify the power supply mechanism, such as by connecting this electrode film to a voltage source via a power supply brush made of carbon or the like.

さらに従来の直接加熱型の定漸装置には次のような問題
もある。Further, the conventional direct heating type constant titration device has the following problems.

すなわち抵抗発熱体としては、正の抵抗温度係数を有す
る（一般にＰＴＯ特性を有すると称される）セラミック
発熱体かよく知られている。このセラミック光熱体はキ
ュリ一温度を辿定することにより所定の発熱温度か得ら
れる。温度立上り時１ｎ」が早い、一定温度で急激に抵
抗が増加するため自己温度制御機能を伽えている等の利
点がある。しかるに、一般に知られている］３ａＴｉＯ
３糸のセラミック発熱体は製作に手間かががり輻射熱源
を用いた場合と較べて加熱リールのコストが極めて高く
なる寸法精良の高いものか得にくい等の欠点かある。That is, as a resistance heating element, a ceramic heating element having a positive temperature coefficient of resistance (generally referred to as having PTO characteristics) is well known. The predetermined heat generation temperature of this ceramic photothermal body can be obtained by tracing the Curie temperature. It has advantages such as a rapid rise in temperature (1n) and a self-temperature control function because the resistance increases rapidly at a constant temperature. However, it is generally known]3aTiO
The three-thread ceramic heating element is time-consuming to manufacture, and the cost of the heating reel is extremely high compared to the case where a radiant heat source is used.The three-thread ceramic heating element has drawbacks such as the fact that it is difficult to obtain a heating reel with high precision dimensions.

そこでこの柚セラミック発熱体の改良も、例えは’Ｍ’
　１ｉ：ｌ　ＦＪｆ−５５−１６４８５９号、％ｍ　Ｂ
〔１５６−１３８７６６号、ｅｂＦＩ（ｉ　５６−１２
３５８１号等の各公報により提案されているか、この柿
セラミック発熱体を使用した加熱定着装置は実用化には
至っていない。Therefore, improvements to this yuzu ceramic heating element, such as 'M'
1i:l FJf-55-164859, %m B
[No. 156-138766, ebFI (i 56-12
Although proposed in various publications such as No. 3581, a heat fixing device using this persimmon ceramic heating element has not yet been put into practical use.

本発明の目的は、上述の従来技術の問題点を解消し、簡
単な機構で抵抗発熱体への通電が可能な直接加熱型の加
熱定着装置を提供することである。SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problems of the prior art and to provide a direct heating type heat fixing device that can energize a resistance heating element with a simple mechanism.

本発明の加熱定着装置は、金属製コアの外周に絶縁層を
介して抵抗発熱体層を形成してなる加熱ロールと加圧ロ
ールを互に圧接し、前記加熱ロールと加圧ロールとの間
にトナー像を保持した支トｊ体を通過させてなる加熱定
着装置において、ｎ’Ｊ記抵抗抵抗発熱体層記金属コア
の軸端部まで延長して設け、該軸端部における抵抗発熱
体層の表面に電極を設けると共に、該電極と前記全域製
コアとの間に電圧源を接続したことを特徴としている。In the heat fixing device of the present invention, a heating roll and a pressure roll are brought into pressure contact with each other, the heating roll having a resistance heating layer formed on the outer periphery of a metal core via an insulating layer, and a gap between the heating roll and the pressure roll. In a heat fixing device in which a supporting member holding a toner image is passed through a support body, a layer of n'J resistance heating elements is provided extending to a shaft end of a metal core, and a resistance heating element at the shaft end is provided. It is characterized in that an electrode is provided on the surface of the layer, and a voltage source is connected between the electrode and the entire core.

を 以下本発明の詳細な図ｍ」により説明する。of The present invention will be explained below with reference to the detailed drawing "m".

第１図は本発明の加熱定着装置の一実施例を示す一部助
血止ｍ図、第２図は第１図のＡ−Ａ絢；助図である。FIG. 1 is a partially assisted hemostasis diagram showing one embodiment of the heat fixing device of the present invention, and FIG. 2 is a partially assisted hemostasis diagram showing an embodiment of the heat fixing device of the present invention.

第１図および第２図において、加熱ロール１および加圧
ロール２はそれぞれ軸受３．３および３ミゴを介して側
板４に回転自在に支承されている。In FIGS. 1 and 2, a heating roll 1 and a pressure roll 2 are rotatably supported by a side plate 4 via bearings 3.3 and 3, respectively.

加熱ロール１と加圧ロール２は一飄側で図示しない駆動
手段に連結されている。また他端側で加圧ｐ−ル２は加
熱ロール１に図示しない加圧手段により弾性的に抑圧き
れている。The heating roll 1 and the pressure roll 2 are connected to a drive means (not shown) at one side. Further, on the other end side, the pressure roller 2 is elastically suppressed by a pressure means (not shown) on the heating roll 1.

加熱ロール１は、金属製の中空コア５の外周に結合層６
、絶縁層７および抵抗発熱体層８をこの順に積層して形
成されている。特に絶縁層７の一端は中空コア５の一方
の軸部の外周まで延長して形成されている。また抵抗発
熱体〕曽８の両端は各々中空コア５の軸部の外周まで延
長して形成されており、抵抗発熱体層８は一端では中空
コア５と電気的に接続されている。さらに、抵抗発熱体
層８の他端側には、結線１４を介して図示しない電圧源
に接続された給電ブラシ１３と接する電極膜９が形成さ
れていると共に、中空コア５のｌｌ１ｌＩＪ端部には結
線１４′を介して上記電圧源に接続されたｋ　化ブラシ
１３悸設置されている。そして抵抗発熱体層８の外周面
は離型性層１０で被覆されている。The heating roll 1 has a bonding layer 6 on the outer periphery of a hollow metal core 5.
, an insulating layer 7 and a resistance heating layer 8 are laminated in this order. In particular, one end of the insulating layer 7 is formed to extend to the outer periphery of one shaft portion of the hollow core 5. Further, both ends of the resistive heating element 8 are formed to extend to the outer periphery of the shaft portion of the hollow core 5, and the resistive heating element layer 8 is electrically connected to the hollow core 5 at one end. Furthermore, an electrode film 9 is formed on the other end side of the resistance heating element layer 8 and is in contact with a power supply brush 13 connected to a voltage source (not shown) via a wire connection 14. A k-brush 13 is connected to the voltage source via a connection 14'. The outer circumferential surface of the resistance heating layer 8 is covered with a releasable layer 10.

加圧ローラ２は金属製の中空コア１３の外周に耐熱弾性
体層１４を被損して形成されている。The pressure roller 2 is formed by damaging a heat-resistant elastic layer 14 around the outer periphery of a hollow core 13 made of metal.

上記の加熱ロールｌの各部の詳細は次の通りである。Details of each part of the above-mentioned heating roll 1 are as follows.

抵抗発熱体層８は、Ｔ１０ａ兼のセラミックでノヒ成す
ることにより実用化が可能となる。ＴｉＯ，，１４のセ
ラミックはＴｉ０ｚ−ｚ（０≦ｘ（１）なる化学式で放
され、Ｘが大きくなるに従って比抵抗は小さくなる。こ
の場合製作雰囲気を副詞することにより、Ｔｉ０２−Ｘ
のＸのル１弓整が可能であり、例えは雰囲気の還元性か
弘くなる梱Ｘは大となる。このＴｌＯ２糸のセラミック
の特徴として、耐食性が大であり、がつ少ない消弘亀力
（ａｏＶ　Ｘ’５Ａないし５０　Ｖ　Ｘ　６ｉ程度）で
しかも短１１′ｆ間（数秒ないし数十秒ンで２ＱＯｐ朽
度の表’６ｊ温度が得られることと共に、符に、原料粉
末を用いてプラズマ溶射によって容易に抵抗膜を形成で
きることか挙けられる。すなわちＴ　ｉ　ＯＺ　糸のセ
ラミックによれは抵抗膜の形成手段としてプラズマ溶射
か適用できるので、ＢａＴ１０３系のセラミックと較べ
て製作コストが大幅に低減され、従来の輻射熱源を使用
した場合と同等又はそれ以下のコストで加熱ロールの製
作が可能となる。たたしＴｌＯ２糸のセラミックは、温
度が高くなるにつれて抵抗か減少Ｊ−るという負の抵抗
温度係数を有しているので、抵抗発熱９層と入力電源と
の間に所定温度に達づ−ると発熱体層への通電か停止す
る制御回路を組込むことか必要である。The resistance heating element layer 8 can be put to practical use by forming it with a ceramic that also serves as T10a. The ceramic of TiO,,14 is released with the chemical formula Ti0z-z(0≦x(1), and the resistivity decreases as X increases.In this case, by adverbizing the manufacturing atmosphere, Ti02-X
It is possible to adjust the value of X by 1, and for example, if the reducing nature of the atmosphere increases, the value of X becomes large. The characteristics of this ceramic TlO2 thread are that it has high corrosion resistance, low decompression torque (about aoV X'5A to 50 V In addition to being able to obtain the table '6j temperature of decay rate, it is also possible to easily form a resistive film using raw material powder by plasma spraying.In other words, the warping of the ceramic of T i OZ thread is the most effective way to form a resistive film. Since plasma spraying can be applied as a method, the production cost is significantly reduced compared to BaT103 ceramic, and the heating roll can be produced at the same or lower cost than when using a conventional radiant heat source. However, the TlO2 thread ceramic has a negative temperature coefficient of resistance, meaning that the resistance decreases as the temperature rises, so a predetermined temperature is reached between the resistance heating layer 9 and the input power source. It is necessary to incorporate a control circuit to turn on or off the power supply to the heating element layer.

絶縁層７は、抵抗発熱体層８と中空コア５の亀気的絶稼
を得るためのもので、拙々の材質のものか使用できるか
、抵抗発熱ｆ＋層８がＴｉＯ２糸セラミックである場合
はＡｔ２０３・ＭｇＯか適当である。The insulating layer 7 is for obtaining the best performance of the resistance heating element layer 8 and the hollow core 5, and is it possible to use a material made of a poor material?If the resistance heating layer f+ layer 8 is made of TiO2 thread ceramic is At203/MgO or appropriate.

結合層６は絶縁層７を中空コア５に薙実に固定するため
のもので、中空コア５や絶縁層７の材質によっては省略
してもよい。The bonding layer 6 is for fixing the insulating layer 7 to the hollow core 5 and may be omitted depending on the materials of the hollow core 5 and the insulating layer 7.

上記の抵抗発熱Ｉ４一層、絶縁層及び結合ｊ曽の厚さは
、定本温度、材質（組成）や中空コアの寸法（長さ、外
径へ内径）等に応じて適宜設定すれはよい。：例えは中
空コアか２７０ル＋（長さ）　Ｘ　３４ｒｓｎφ（外径
〕３２朋φ（内径）で定詣温曳か１９０−２’ｌ　Ｏ［
の揚台は、抵抗発熱体ｍ　（Ｔｉ０２）は５０〜７０／
’ｍｋ　＃　、絶ｋ　層（Ａ−４ｚＯｓ・Ｍｇ０）は１
５０Ｎ２００μｍ＆＆、そして結合１（Ｎｉ　−Ａ７−
Ｍｏ　）は５０μｍ程度か適当である。The thicknesses of the resistive heating layer I4, the insulating layer, and the bonding layer may be appropriately set depending on the main body temperature, material (composition), dimensions (length, outer diameter to inner diameter), etc. of the hollow core. : For example, a hollow core is 270 l + (length)
The lifting platform has a resistance heating element m (Ti02) of 50 to 70/
'mk #, the absolute k layer (A-4zOs・Mg0) is 1
50N200μm&&, and bond 1 (Ni-A7-
Mo) is approximately 50 μm or appropriate.

次に上記構成による加熱定着装量の動作を説明する。Next, the operation of the heat fixing amount with the above configuration will be explained.

まず互に圧接する加熱ロール１と加圧ロール２を図示し
ないモータ、歯車等の駆動手段により回転させると共に
、給電ブラシ１４．１４’に例えは産月１交流電圧を印
加すると、電極＠９および中空コア５を経て抵抗発熱体
層８に電流が流れて、加熱される。First, the heating roll 1 and the pressure roll 2 which are in pressure contact with each other are rotated by a driving means such as a motor or gears (not shown), and when an AC voltage of 1 AC voltage is applied to the power supply brushes 14 and 14', the electrodes @9 and A current flows through the hollow core 5 to the resistance heating layer 8, thereby heating it.

このようにして加熱ロール１の表面が所定の定着温度に
達すると、加熱ロー／Ｉ／１と加圧ロール２との間にト
ナー像１５を保持する支持体１６を通過させて定着回像
か得られる。In this way, when the surface of the heating roll 1 reaches a predetermined fixing temperature, the support 16 holding the toner image 15 is passed between the heating roll/I/1 and the pressure roll 2, and a fixing image is formed. can get.

上記の加熱定着装量によれは、加熱ロールｌ　ＯＪ中空
コア５を電極の一つとして利用してしＡるＱ〕で電極の
一方を省略でき、給％機構を簡素化できる。Depending on the above-mentioned heat fixing load, one of the electrodes can be omitted by using the heating roll 1 OJ hollow core 5 as one of the electrodes, and the feeding rate mechanism can be simplified.

また抵抗発熱体層８が中空コア５の細部まで延長してい
るので、ロールの両端部での温度低下を凪止し加熱ロー
ル表面の軸方向の温度分布を実質的に均一にすることか
できる。Furthermore, since the resistance heating layer 8 extends to the details of the hollow core 5, it is possible to prevent the temperature from decreasing at both ends of the roll and to make the temperature distribution in the axial direction on the surface of the heating roll substantially uniform. .

以上に記述の如く、本発明の加熱定着装量は、像か得ら
れる。As described above, the heat fixing charge of the present invention provides an image.

【図面の簡単な説明】[Brief explanation of the drawing]

第１図は本発明の加熱定着装量の一実施例を示す一部断
面正面図、第２図は第１図のＡ−Ａ〜１面図である。 １：加熱”−ル、２＝加圧ロール、５：中空コア、６：
接着層、７：絶縁層、８：抵抗発熱体層１０：電極、１
５：トナー像、１６：支持体。 出願人　日立金机株式会祉：ソー ′−□パ−−シ′ 第　、１　図 ２　　第８図 ＼FIG. 1 is a partially sectional front view showing an embodiment of the heat fixing device according to the present invention, and FIG. 2 is a plane view taken along line AA in FIG. 1. 1: heating roll, 2 = pressure roll, 5: hollow core, 6:
Adhesive layer, 7: Insulating layer, 8: Resistance heating element layer 10: Electrode, 1
5: toner image, 16: support. Applicant Hitachi Kinki Co., Ltd.: So'-□Percy' Part 1 Figure 2 Figure 8\

Claims (1)

【特許請求の範囲】 １、　金践製コアの外周に絶縁層を介して抵抗発熱体層
を形成してなる加熱ロールと加圧ロールを互に圧接し、
前記加熱ロールと加圧ロールとの山）にトナー像を保持
した支持体を通過させてなる加熱定着装置２において、
ｎｌ」記抵抗発熱体層を前記金属製コアの一方の軸端部
まで延長して設け、該軸端部における抵わＬ発熱体層の
表面に一極を設けると共に、該を極と前記今風製コアと
の曲に箪Ｈｇ諒を接続したことを特徴とする加熱定着装
置。 ２　抵抗発熱体層をＴｌＯ２糸のセラミックで形成した
ことを特徴とする特Ｗ１−柘求の範囲第１項記載の加熱
定着装置。[Scope of Claims] 1. A heating roll and a pressure roll formed by forming a resistance heating layer on the outer periphery of a core manufactured by Kintsugi with an insulating layer interposed therebetween are pressed against each other,
In the heat fixing device 2 in which a support holding a toner image is passed through a pile of the heating roll and the pressure roll,
A resistive heating element layer extending to one shaft end of the metal core is provided, and one pole is provided on the surface of the resistive heating element layer at the shaft end, and the resistive heating element layer is provided as a pole and the resistive heating element layer is provided as a resistor. A heat fixing device characterized in that a heat fixing device is connected to the core. 2. The heating fixing device according to item 1 of the scope of the specification W1-Tsugu, characterized in that the resistance heating layer is formed of ceramic of TlO2 thread.