JPH07319311A - Fixing device - Google Patents
Fixing deviceInfo
- Publication number
- JPH07319311A JPH07319311A JP11683994A JP11683994A JPH07319311A JP H07319311 A JPH07319311 A JP H07319311A JP 11683994 A JP11683994 A JP 11683994A JP 11683994 A JP11683994 A JP 11683994A JP H07319311 A JPH07319311 A JP H07319311A
- Authority
- JP
- Japan
- Prior art keywords
- roller
- heating element
- fixing roller
- conductive core
- conductive
- 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.)
- Granted
Links
Landscapes
- Control Of Resistance Heating (AREA)
- Fixing For Electrophotography (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、トナーを用いて現像す
る電子写真方式の画像形成装置に使用する定着装置に関
する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fixing device used in an electrophotographic image forming apparatus which develops with toner.
【０００２】[0002]
【従来の技術】電子写真方式の画像形成装置は、感光体
上に露光により静電潜像を形成した後、トナーで現像し
てトナー像を形成し、そのトナー像を転写紙に転写して
から定着装置で転写紙上のトナーを加熱溶融して定着す
るようにしている。2. Description of the Related Art An electrophotographic image forming apparatus forms an electrostatic latent image on a photosensitive member by exposure, develops it with toner to form a toner image, and transfers the toner image onto a transfer paper. The fixing device heats and melts the toner on the transfer paper to fix the toner.
【０００３】このような装置に使用する定着装置として
は、従来、ハロゲンランプを内蔵した熱定着ローラと表
面が弾性部材からなる加圧ローラを圧接して配置し、ハ
ロゲンランプでローラ部全体を加熱し、転写紙を熱定着
ローラと加圧ローラとの圧接部を通過させることで熱定
着するようにしていた。As a fixing device used in such an apparatus, conventionally, a heat fixing roller having a halogen lamp built therein and a pressure roller having an elastic member on its surface are arranged in pressure contact with each other, and the entire halogen roller portion is heated by the halogen lamp. Then, the transfer paper is heat-fixed by passing through the pressure contact portion between the heat-fixing roller and the pressure roller.
【０００４】しかし、ハロゲンランプでローラ部全体を
加熱するようにしたのでは、熱定着ローラを定着に必要
な温度に高めるのに比較的長い時間がかかり、また、消
費電力も大きいという問題があった。However, if the whole of the roller portion is heated by the halogen lamp, there is a problem that it takes a relatively long time to raise the temperature of the heat fixing roller to the temperature required for fixing and the power consumption is large. It was
【０００５】そこで特公平５−６４３５０号公報では、
図５に示すように、導電性セラミック材からなる円筒体
１の表面に離型性向上のためにふっ素樹脂層２を形成し
て熱定着ローラを構成し、円筒体１の両端部間に電圧を
印加することにより円筒体１を直接発熱させて熱応答性
を改善している。Therefore, in Japanese Patent Publication No. 5-64350,
As shown in FIG. 5, a fluororesin layer 2 is formed on the surface of a cylindrical body 1 made of a conductive ceramic material to improve releasability to form a heat fixing roller, and a voltage is applied between both ends of the cylindrical body 1. Is applied to heat the cylindrical body 1 directly to improve the thermal response.
【０００６】[0006]
【発明が解決しようとする課題】しかし、このような定
着装置では、熱定着ローラに弾性がないため、熱定着ロ
ーラの径を小さくすると加圧ローラを圧接したときに生
じるニップ部が少なくなり、良好な定着ができなくなる
問題があり、また、熱定着した後の転写紙に熱定着ロー
ラによるカールが顕著に生じてしまう問題があった。However, in such a fixing device, since the heat fixing roller does not have elasticity, reducing the diameter of the heat fixing roller reduces the nip portion generated when the pressure roller is brought into pressure contact, There is a problem in that good fixing cannot be performed, and there is a problem in that the transfer paper after heat fixing is significantly curled by the heat fixing roller.
【０００７】そこで本発明は、熱定着ローラの径を小さ
しても良好な定着ができると共に転写紙がカールする虞
れが無く、従って小形化を図ることができ、しかも熱応
答性の向上、電力の省力化を図ることができる定着装置
を提供する。Therefore, according to the present invention, even if the diameter of the heat fixing roller is made small, good fixing is possible and there is no fear that the transfer paper is curled. Therefore, the size can be reduced, and the heat response is improved and the power consumption is reduced. To provide a fixing device capable of saving labor.
【０００８】[0008]
【課題を解決するための手段】本発明は、熱定着ローラ
と表面が弾性部材からなる加圧ローラを圧接して設け、
転写紙がその圧接部を通過することにより転写紙上のト
ナーを熱定着する定着装置において、熱定着ローラは、
両端部にそれぞれ設けられ、外部からの電力を受電する
１対の導電部と、この各導電部の一方に一端を結合し他
端を自由端とした、少なくとも１本の第１の導電性芯軸
と、各導電部の他方に一端を結合し他端を自由端とし、
第１の導電性芯軸と並行に配置した、少なくとも１本の
第２の導電性芯軸と、第１、第２の導電性芯軸を内部に
埋設してローラ部を形成した弾性発熱体とで構成したも
のである。According to the present invention, a heat fixing roller and a pressure roller whose surface is made of an elastic member are provided in pressure contact with each other.
In a fixing device that thermally fixes the toner on the transfer paper as the transfer paper passes through the pressure contact portion, the heat fixing roller is
A pair of conductive parts which are respectively provided at both ends and receive electric power from the outside, and at least one first conductive core in which one end is coupled to one of the conductive parts and the other end is a free end. One end is connected to the shaft and the other of the conductive parts, and the other end is a free end,
At least one second conductive core shaft arranged in parallel with the first conductive core shaft, and an elastic heating element in which the first and second conductive core shafts are embedded to form a roller portion. It is composed of and.
【０００９】[0009]
【作用】このような構成の発明においては、熱定着ロー
ラのローラ部は弾性発熱体で構成しているので、加圧ロ
ーラとの圧接部では熱定着ローラ及び加圧ローラの両方
に歪みが生じる。従って熱定着ローラ及び加圧ローラの
径が小さくても定着に充分なニップ部を形成することが
できる。In the invention having such a structure, since the roller portion of the heat fixing roller is composed of the elastic heating element, distortion occurs in both the heat fixing roller and the pressure roller at the pressure contact portion with the pressure roller. . Therefore, even if the diameters of the heat fixing roller and the pressure roller are small, a nip portion sufficient for fixing can be formed.
【００１０】また、第１の導電性芯軸と第２の導電性芯
軸が電極として作用し、その各芯軸から周囲の発熱体に
電流が流れ発熱体が直接発熱する。Further, the first conductive core shaft and the second conductive core shaft act as electrodes, and a current flows from each core shaft to the surrounding heat generating element, so that the heat generating element directly generates heat.
【００１１】[0011]
【実施例】以下、本発明の一実施例を図面を参照して説
明する。図１において、１１は熱定着ローラ、１２は加
圧ローラである。前記熱定着ローラ１１は、ローラ部を
弾性発熱体１３で構成し、その弾性発熱体１３の内部に
図２に示すように互いに並行に配置した例えばステンレ
スからなる第１、第２の導電性芯軸１４，１５を埋設し
ている。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. In FIG. 1, 11 is a heat fixing roller and 12 is a pressure roller. The heat fixing roller 11 has a roller portion composed of an elastic heating element 13, and first and second conductive cores made of, for example, stainless steel and arranged inside the elastic heating element 13 in parallel with each other as shown in FIG. The shafts 14 and 15 are embedded.
【００１２】前記弾性発熱体１３の両端にはそれぞれ円
柱状の絶縁ホルダ１６，１７が固定されている。前記絶
縁ホルダ１６，１７は熱定着ローラ１１をフレーム１８
に対して回転自在に支持している。Cylindrical insulating holders 16 and 17 are fixed to both ends of the elastic heating element 13, respectively. The insulating holders 16 and 17 connect the heat fixing roller 11 to the frame 18
It is rotatably supported with respect to.
【００１３】前記各絶縁ホルダ１６，１７のフレーム１
８から外側に突出した側の一部に外側を円周面に形成し
た導電部１９，２０を設け、さらに外側に突出した側の
端部にギア２１，２２を取り付けている。Frame 1 of each insulation holder 16 and 17
Conductive portions 19 and 20 having outer circumferential surfaces are provided on a part of the side projecting outward from 8, and gears 21 and 22 are attached to the ends on the side projecting outward.
【００１４】前記第１の導電性芯軸１４は、その一端を
前記絶縁ホルダ１６内を貫通して前記導電部１９に結合
し、他端を絶縁ホルダ１７の近傍まで延出させて自由端
としている。The first conductive core shaft 14 has one end penetrating through the insulating holder 16 and coupled to the conductive portion 19, and the other end extending to the vicinity of the insulating holder 17 to form a free end. There is.
【００１５】前記第２の導電性芯軸１５は、その一端を
前記絶縁ホルダ１７内を貫通して前記導電部２０に結合
し、他端を絶縁ホルダ１６の近傍まで延出させて自由端
としている。The second conductive core shaft 15 has one end penetrating through the insulating holder 17 and coupled to the conductive portion 20, and the other end extending to the vicinity of the insulating holder 16 to form a free end. There is.
【００１６】前記導電部１９，２０の外周面に導電ブラ
シ２３，２４を接触して配置し、その導電ブラシ２３，
２４間に交流電力源２５から電力を供給するようにして
いる。Conductive brushes 23 and 24 are arranged in contact with the outer peripheral surfaces of the conductive portions 19 and 20, respectively.
Power is supplied from an AC power source 25 between 24.
【００１７】前記熱定着ローラ１１はギア２１，２２を
介してモータ（図示せず）により回転力を与えられ、回
転駆動するようになっている。前記熱定着ローラ１１の
弾性発熱体１３は、例えばＰＦＡ（テトラフルオロエチ
レン・パーフルオロアルキルビニルエーテル）やＰＴＦ
Ｅ（ポリテトラフルオロエチレン）にカーボン粒子を分
散させたものを使用している。The thermal fixing roller 11 is rotationally driven by being given a rotational force by a motor (not shown) via gears 21 and 22. The elastic heating element 13 of the heat fixing roller 11 is made of, for example, PFA (tetrafluoroethylene / perfluoroalkyl vinyl ether) or PTF.
E (polytetrafluoroethylene) in which carbon particles are dispersed is used.
【００１８】前記加圧ローラ１２は、金属からなる軸２
６の周囲に所定肉厚のシリコンゴム等の弾性層２７を形
成して構成している。The pressure roller 12 is a shaft 2 made of metal.
An elastic layer 27 of silicon rubber or the like having a predetermined thickness is formed on the periphery of 6.
【００１９】前記熱定着ローラ１１の弾性発熱体１３の
硬度は前記加圧ローラ１２の弾性層２７の硬度と同等か
それ以下が好ましい。The hardness of the elastic heating element 13 of the heat fixing roller 11 is preferably equal to or less than the hardness of the elastic layer 27 of the pressure roller 12.
【００２０】このような構成の実施例では、交流電力源
２５から交流電力が与えられると、第１、第２の導電性
芯軸１４，１５間に弾性発熱体１３を通して電流が流
れ、弾性発熱体１３が直接発熱する。In the embodiment having such a structure, when AC power is applied from the AC power source 25, a current flows through the elastic heating element 13 between the first and second conductive core shafts 14 and 15 to generate elastic heat. The body 13 directly generates heat.
【００２１】このように弾性発熱体１３が直接発熱する
ので、熱定着ローラ１１の表面が定着に適した温度に上
昇するまでの時間は比較的短くなり、熱応答性を向上で
きる。また、供給電力に対する発熱効率がよく、省電力
化を図ることができる。Since the elastic heating element 13 directly generates heat in this way, the time required for the surface of the heat fixing roller 11 to rise to a temperature suitable for fixing is relatively short, and the thermal response can be improved. Further, the efficiency of heat generation with respect to the supplied power is good, and power saving can be achieved.
【００２２】定着時には熱定着ローラ１１はモータによ
りギア２１，２２を介して回転する。そして熱定着ロー
ラ１１の回転により加圧ローラ１２も回転する。At the time of fixing, the heat fixing roller 11 is rotated by a motor via gears 21 and 22. The rotation of the heat fixing roller 11 also rotates the pressure roller 12.
【００２３】この状態で図３に示すようにトナー２８を
付着した転写紙２９が熱定着ローラ１１と加圧ローラ１
２との圧接部を通過することにより熱定着ローラ１１か
らの熱でトナー２８が溶融し定着される。In this state, as shown in FIG. 3, the transfer paper 29 to which the toner 28 is attached is the heat fixing roller 11 and the pressure roller 1.
The toner 28 is fused and fixed by the heat from the heat fixing roller 11 by passing through the pressure contact portion with 2.
【００２４】このとき熱定着ローラ１１と加圧ローラ１
２との圧接部は略同等の硬度からなる弾性発熱体１３と
弾性層２７であるので、圧接力により互いに歪み比較的
大きなニップ部３０が形成される。従って、転写紙２９
のトナー２８は熱定着ローラ１１により確実に溶融し良
好な定着ができる。At this time, the heat fixing roller 11 and the pressure roller 1
Since the pressure contact portion with 2 is the elastic heating element 13 and the elastic layer 27 which have substantially the same hardness, they are distorted by the pressure contact force and a relatively large nip portion 30 is formed. Therefore, the transfer paper 29
The toner 28 is surely melted by the heat fixing roller 11 and good fixing can be performed.
【００２５】また、熱定着ローラ１１と加圧ローラ１２
が互いに歪んでニップ部３０を形成するので、熱定着ロ
ーラ１１及び加圧ローラ１２として小径のものを使用し
ても充分なニップ部を形成することが可能となり、従っ
て小形化しても良好な定着ができ、しかも転写紙２９が
カールするような不都合は生じない。Further, the heat fixing roller 11 and the pressure roller 12
Distort each other to form the nip portion 30, so that it is possible to form a sufficient nip portion even if the heat fixing roller 11 and the pressure roller 12 having a small diameter are used. The transfer paper 29 does not curl.
【００２６】なお、熱定着ローラ１１の弾性発熱体１３
の硬度を加圧ローラ１２の弾性層２７の硬度よりも大き
くすると、熱定着ローラ１１の歪みがほとんど無くなる
ので、この場合は転写紙がカールする不都合が生じ、ま
たニップ部も少なくなって小形化した場合には良好な定
着ができなくなる。The elastic heating element 13 of the heat fixing roller 11
If the hardness is larger than the hardness of the elastic layer 27 of the pressure roller 12, the heat fixing roller 11 has almost no distortion, and in this case, the transfer paper curls inconveniently and the nip portion is reduced to reduce the size. If so, good fixing cannot be achieved.
【００２７】また、熱定着ローラ１１の弾性発熱体１３
をＰＦＡやＰＴＦＥのようにテフロン系の材料で構成し
ているので、離型性に優れトナー２８が付着することは
ない。従って、特別に離型層を形成する必要は無い。Further, the elastic heating element 13 of the heat fixing roller 11
Is made of a Teflon-based material such as PFA and PTFE, the toner 28 is excellent in releasability and does not adhere. Therefore, it is not necessary to specifically form the release layer.
【００２８】なお、前記実施例では熱定着ローラとして
弾性発熱体１３内に第１、第２の２本の導電性芯軸１
４，１５を埋設したものについて述べたが必ずしもこれ
に限定するものではなく、図４に示すように、弾性発熱
体１３に対して比較的径の大きい１本の第１の導電性芯
軸３１を中央に埋設し、その第１の導電性芯軸３１の周
囲に比較的径の小さい複数、例えば４本の第２の導電性
芯軸３２ａ，３２ｂ，３２ｃ，３２ｄを埋設したもので
あってもよい。In the above embodiment, the first and second conductive core shafts 1 are provided in the elastic heating element 13 as a heat fixing roller.
4 and 15 are embedded, the present invention is not limited to this. As shown in FIG. 4, one first conductive core shaft 31 having a relatively large diameter with respect to the elastic heating element 13 is used. A plurality of second conductive core shafts 32a, 32b, 32c, 32d each having a relatively small diameter, for example, four, are buried around the first conductive core shaft 31. Good.
【００２９】このようにすれば熱定着ローラの強度を高
めることができる。また、１本の第１の導電性芯軸３１
と４本の第２の導電性芯軸３２ａ，３２ｂ，３２ｃ，３
２ｄとの間で電流が流れるので、熱応答性をさらに向上
できる。By doing so, the strength of the heat fixing roller can be increased. In addition, one first conductive core shaft 31
And four second conductive core shafts 32a, 32b, 32c, 3
Since a current flows between 2d and 2d, the thermal response can be further improved.
【００３０】[0030]
【発明の効果】以上、本発明によれば、弾性発熱体内に
電極となる第１、第２の導電性芯軸を埋設して熱定着ロ
ーラのローラ部を形成するので、熱定着ローラの径を小
さしても良好な定着ができると共に転写紙がカールする
虞れが無く、従って小形化を図ることができ、しかも熱
応答性の向上、電力の省力化を図ることができる定着装
置を提供できる。As described above, according to the present invention, the roller portion of the heat fixing roller is formed by embedding the first and second conductive core shafts serving as electrodes in the elastic heating element, so that the diameter of the heat fixing roller is increased. It is possible to provide a fixing device that can perform good fixing even when the size is small and that the transfer paper is not curled, and therefore can be downsized, and that thermal response can be improved and power consumption can be saved. .
【図１】本発明の一実施例を示す断面図。FIG. 1 is a sectional view showing an embodiment of the present invention.
【図２】同実施例の熱定着ローラの断面図。FIG. 2 is a sectional view of the heat fixing roller of the embodiment.
【図３】同実施例の熱定着ローラと加圧ローラの圧接状
態の断面図。FIG. 3 is a cross-sectional view of a heat fixing roller and a pressure roller of the same embodiment in a pressure contact state.
【図４】本発明の熱定着ローラの他の実施例を示す断面
図。FIG. 4 is a sectional view showing another embodiment of the heat fixing roller of the present invention.
【図５】従来の熱定着ローラの断面図。FIG. 5 is a sectional view of a conventional heat fixing roller.
１１…熱定着ローラ １２…加圧ローラ １３…弾性発熱体 １４…第１の導電性芯軸 １５…第２の導電性芯軸 １９，２０…導電部 11 ... Thermal fixing roller 12 ... Pressure roller 13 ... Elastic heating element 14 ... First conductive core shaft 15 ... Second conductive core shaft 19, 20 ... Conductive portion
Claims (1)
加圧ローラを圧接して設け、転写紙がその圧接部を通過
することにより転写紙上のトナーを熱定着する定着装置
において、前記熱定着ローラは、両端部にそれぞれ設け
られ、外部からの電力を受電する１対の導電部と、この
各導電部の一方に一端を結合し他端を自由端とした、少
なくとも１本の第１の導電性芯軸と、前記各導電部の他
方に一端を結合し他端を自由端とし、前記第１の導電性
芯軸と並行に配置した、少なくとも１本の第２の導電性
芯軸と、前記第１、第２の導電性芯軸を内部に埋設して
ローラ部を形成した弾性発熱体とで構成したことを特徴
とする定着装置。1. A fixing device, wherein a heat fixing roller and a pressure roller whose surface is made of an elastic member are provided in pressure contact with each other, and the transfer paper passes through the pressure contact portion to thermally fix the toner on the transfer paper. The rollers are provided at both ends, respectively, and have a pair of conductive parts for receiving electric power from the outside, and at least one first conductive part having one end coupled to one of the conductive parts and the other end being a free end. A conductive core shaft and at least one second conductive core shaft arranged in parallel with the first conductive core shaft, with one end coupled to the other of the conductive parts and the other end being a free end; And an elastic heating element in which the first and second conductive core shafts are embedded inside to form a roller portion.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6116839A JP3067522B2 (en) | 1994-05-30 | 1994-05-30 | Fixing device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6116839A JP3067522B2 (en) | 1994-05-30 | 1994-05-30 | Fixing device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH07319311A true JPH07319311A (en) | 1995-12-08 |
| JP3067522B2 JP3067522B2 (en) | 2000-07-17 |
Family
ID=14696909
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP6116839A Expired - Lifetime JP3067522B2 (en) | 1994-05-30 | 1994-05-30 | Fixing device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3067522B2 (en) |
-
1994
- 1994-05-30 JP JP6116839A patent/JP3067522B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JP3067522B2 (en) | 2000-07-17 |
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