JPH0361978A - Fixing device - Google Patents
Fixing deviceInfo
- Publication number
- JPH0361978A JPH0361978A JP19660189A JP19660189A JPH0361978A JP H0361978 A JPH0361978 A JP H0361978A JP 19660189 A JP19660189 A JP 19660189A JP 19660189 A JP19660189 A JP 19660189A JP H0361978 A JPH0361978 A JP H0361978A
- Authority
- JP
- Japan
- Prior art keywords
- heating roller
- heat
- gear
- roller
- heater
- 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
- 238000010438 heat treatment Methods 0.000 claims abstract description 60
- 229920006015 heat resistant resin Polymers 0.000 claims abstract description 14
- 239000000463 material Substances 0.000 abstract description 3
- 229920005989 resin Polymers 0.000 abstract description 2
- 239000011347 resin Substances 0.000 abstract description 2
- 230000005855 radiation Effects 0.000 description 12
- 230000002265 prevention Effects 0.000 description 8
- 230000000694 effects Effects 0.000 description 5
- 239000002184 metal Substances 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000002093 peripheral effect Effects 0.000 description 2
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000017525 heat dissipation Effects 0.000 description 1
- 238000004904 shortening Methods 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
Landscapes
- Fixing For Electrophotography (AREA)
Abstract
Description
【発明の詳細な説明】
［産業上の利用分野］
本発明は、電子写真装置、静電記録装置等の記録装置に
おける加熱ローラを有する定着装置に関するものである
。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a fixing device having a heating roller in a recording device such as an electrophotographic device or an electrostatic recording device.
［従来の技術］
従来、定着装置としては、第４図に示すように１回転せ
る加熱ローラ５１とこれに圧接して従動回転する加圧ロ
ーラ５２を有し、未定着画像が形成されている転写材Ｐ
を挟圧搬送しつつ加熱することにより未定着画像の現像
剤５３を定着する形式のものが知られている。上記加熱
ローラ５１は、外周に取りつけられている歯車５４を介
してモータ（図示せず）からの駆動を受けることによっ
て回転する。上記加熱ローラは、一般に両端が開放され
た円筒体として形成され、その内部空間に加熱手段とし
てのヒータ５５を内蔵し、ローラ表面に耐熱性高離型性
の樹脂の被覆を有しており、ローラ表面温度が１５０〜
２００℃位になるように制御されている。その際、加熱
ローラ５１の端部は、周囲空間への熱の放散か大きいた
めに、ヒータ５５は端部での発熱量を大きくすることに
より、加熱ローラ５１の表面温度分布を長手方向に一様
としている。[Prior Art] Conventionally, as shown in FIG. 4, a fixing device has a heating roller 51 that rotates once and a pressure roller 52 that is in pressure contact with the heating roller 51 and rotates as a result of the rotation, so that an unfixed image is formed. Transfer material P
A type of developer is known in which the developer 53 of an unfixed image is fixed by heating while conveying the developer 53 under pressure. The heating roller 51 rotates by being driven by a motor (not shown) via a gear 54 attached to its outer periphery. The heating roller is generally formed as a cylindrical body with both ends open, has a built-in heater 55 as a heating means in its internal space, and has a heat-resistant and highly releasable resin coating on the roller surface, Roller surface temperature is 150~
The temperature is controlled to be around 200°C. At this time, since the ends of the heating roller 51 dissipate a large amount of heat into the surrounding space, the heater 55 uniformizes the surface temperature distribution of the heating roller 51 in the longitudinal direction by increasing the amount of heat generated at the ends. Thank you very much.
かかる形式の定着装置にあっては、従来加熱ローラ５１
を第５図のごとく回転自在に支持する軸受５６と駆動用
の歯車５４か共に金属製であるためにその熱容量が大と
なり、さらには加熱ローラ５１の開放端部から熱が大き
く放散してしまい、ヒータ電源投入時の湿度上昇が遅く
なる。In such a type of fixing device, conventional heating roller 51
As shown in FIG. 5, both the bearing 56 that rotatably supports the heating roller 51 and the driving gear 54 are made of metal, so their heat capacity is large, and furthermore, a large amount of heat is dissipated from the open end of the heating roller 51. , the humidity rises slowly when the heater power is turned on.
そこで、第６図のごとく軸受（すべり軸受）５６Ａと歯
車５４Ａを耐熱樹脂製として熱容量を小さく、さらには
加熱ローラ５１の端部の開口を小さくするために放熱防
止部材５７Ａを装着しているものかある。Therefore, as shown in FIG. 6, a bearing (sliding bearing) 56A and a gear 54A are made of heat-resistant resin to reduce the heat capacity, and a heat radiation prevention member 57A is installed to reduce the opening at the end of the heating roller 51. There is.
あるいは、第７図のように、耐熱樹脂から成る歯車５４
Ｂと放熱防止部材５７Ｂとを一体とし、そのスリーブ部
分に金属製の軸受５６Ｂを設けている形式のものもある
。Alternatively, as shown in FIG. 7, a gear 54 made of heat-resistant resin
There is also a type in which the heat radiation prevention member 57B is integrated with the heat radiation prevention member 57B, and a metal bearing 56B is provided in the sleeve portion.
［発明か解決しようとする課題］
上記第５図の従来装置にあっては、第５図において加熱
ローラの左端部、中央部、右端部（歯車配置側の端部）
での温度変化を電源投入時から安定時まで比較すると、
例えば室温２０℃、湿度６０％の環境で第８図のととく
の結果が得られた。すなわち、第５図のものにあっては
、第８図から明らかなように、右端部（駆動用歯車側）
での温度上昇（曲線Ｃ）は左端部（駆動用歯車なし側）
の温度上昇（曲線Ａ）及び中央部の温度上昇（曲線Ｂ）
に比しきわめて遅く、温調温度に達するのに非常に長い
時間を要している。これは、既述したように、金属製の
軸受及び歯車の熱容量が大であることモして開放端部か
ら熱が放散することに起因している。[Problems to be Solved by the Invention] In the conventional device shown in FIG.
Comparing the temperature changes from power-on to stabilization,
For example, the particular results shown in FIG. 8 were obtained in an environment with a room temperature of 20° C. and a humidity of 60%. That is, in the case of the one shown in Fig. 5, as is clear from Fig. 8, the right end (drive gear side)
The temperature rise (curve C) at the left end (side without drive gear)
temperature rise (curve A) and temperature rise in the center (curve B)
It takes a very long time to reach the controlled temperature. As mentioned above, this is because the metal bearings and gears have a large heat capacity and heat is dissipated from the open end.
第６図装置の欠点を改善した第７図の従来装置では、軸
５６Ａと駆動用歯車５４Ａに耐熱樹脂を用いて熱容量を
小さくしさらに加熱ローラ５１の端部開口部を放熱防止
部材５７Ａを用いて狭くしたことにより、ローラ端部に
おける放熱防止の効果はある。しかし、放熱防止部材５
７Ａを別途設けることにより、部品点数は増え、そのた
めに製造コストが高くなってしまうという問題を生ずる
。In the conventional device shown in FIG. 7, which improves the drawbacks of the device shown in FIG. 6, a heat-resistant resin is used for the shaft 56A and the drive gear 54A to reduce the heat capacity, and a heat radiation prevention member 57A is used for the opening at the end of the heating roller 51. By making the width narrower, there is an effect of preventing heat radiation at the roller end. However, the heat radiation prevention member 5
By separately providing 7A, the number of parts increases, which causes a problem of increasing manufacturing costs.
また、第７図の問題を解決せんとする、上記第８図の従
来装置では、駆動用歯車と放熱防止部材が耐熱樹脂で一
体成形されることにより、部品点数を増やすことなく、
ローラ端部での放熱を防止している。しかし、第８図に
示されているような従来例では、加熱ローラ５１の内周
面に耐熱樹脂からなる放熱防止部材５７Ｂをねじ等で取
りつけられないため、取付けは接着に依らざるを得ない
。In addition, in the conventional device shown in FIG. 8, which attempts to solve the problem shown in FIG.
Prevents heat radiation at the roller ends. However, in the conventional example shown in FIG. 8, the heat radiation prevention member 57B made of heat-resistant resin cannot be attached to the inner circumferential surface of the heating roller 51 with screws or the like, so the attachment must be done by adhesive. .
しかし、加熱ローラ５１と耐熱樹脂の放熱防止部材５７
Ｂとでは接着性に難がある。さらには、加熱ローラ５１
の端部は外気に直接触れているために外周面からの放熱
は大きくなってしまう。However, the heating roller 51 and the heat radiation prevention member 57 made of heat-resistant resin
B has poor adhesion. Furthermore, the heating roller 51
Because the ends of the tube are in direct contact with the outside air, heat radiation from the outer circumferential surface becomes large.
かくして、いづれの場合も問題をかかえている。そこで
、ローラ端部での熱の放散は不可避とした上でヒータの
端部での発熱量をさらに大きくすれば、歯車配置側端部
でも短い時間で温調温度に達するということが想到でき
る。しかし、ヒータの端部発熱量をさらに大きくするこ
とは、ヒータの寿命を短くするという問題が生じるため
に実施できず、既述の従来装置に依っていたというのが
実情である。したがって、加熱ローラの表面温度が長手
方向に関して−様な温度分布（温調温度すなわち定着温
度）に達するまでには、長時間かかるという欠点かあっ
た。その結果、加熱ローラの表面温度が長手で−様に定
着温度に達する前に定着させた画像は、歯車配置側の端
部が適正な定着温度に達していないために定着画像の中
央部に比べて上記端部での画像は定着性が悪くなってい
た。Thus, there are problems in both cases. Therefore, if the dissipation of heat at the roller end is unavoidable and the amount of heat generated at the end of the heater is further increased, it is possible to reach the controlled temperature in a short time even at the end on the gear arrangement side. However, increasing the amount of heat generated at the end of the heater cannot be carried out because of the problem of shortening the life of the heater, and the current situation is that the conventional device described above has been relied upon. Therefore, there is a drawback that it takes a long time for the surface temperature of the heating roller to reach a -like temperature distribution (temperature control temperature, ie, fixing temperature) in the longitudinal direction. As a result, the image that is fixed before the surface temperature of the heating roller reaches the fixing temperature in the longitudinal direction is compared to the center of the fixed image because the end on the side where the gear is arranged has not reached the appropriate fixing temperature. Therefore, the fixing properties of the image at the above-mentioned end portions were poor.
本発明は、上述のごとくの従来装置の問題を解決し、ｍ
ｔ単な構造で、短時間のうちに長手方向に−様な定着温
度に達する加熱ローラを有する定着装置を提供すること
を目的としている。The present invention solves the problems of the conventional device as described above, and
It is an object of the present invention to provide a fixing device having a simple structure and having a heating roller that reaches a fixing temperature of - in the longitudinal direction in a short time.
［Ｂ題を解決するための手段］
本発明によれば、上記目的は、
ヒータを備える加熱ローラと、これに圧接回転する加圧
ローラとを有する定着装置において、加熱ローラは、軸
方向に開放された中空円筒体の内部空間を有し。[Means for Solving Problem B] According to the present invention, the above object is as follows: In a fixing device that has a heating roller equipped with a heater and a pressure roller that rotates in pressure contact with the heating roller, the heating roller is opened in the axial direction. It has an internal space of a hollow cylindrical body.
上記加熱ローラの端部外周には、該加熱ローラを回転駆
動せしめるための耐熱樹脂製の歯車が取りつけられてお
り、
上記歯車は、上記加熱ローラの端部もしくはそれよりも
軸方向外方位置にて、加熱ローラの端部内径よりも半径
内方に延びる端部延長部を有している、
ことにより達成される。A gear made of heat-resistant resin is attached to the outer periphery of the end of the heating roller to rotate the heating roller, and the gear is located at the end of the heating roller or at a position axially outward from it. This is achieved by having an end extension extending radially inward from the inner diameter of the end of the heating roller.
［作用］
上記のごとくの本発明にあっては、加熱ローラ駆動用の
歯車は、加熱ローラへの取付の際には該加熱ローラの外
周面でねじ等で固着される。また該歯車は耐熱性樹脂で
あるために熱容量が小さくヒータ電源投入時の温度上昇
Ｃ影響をあまり与えず比較的早く立ち上がる。さらに、
歯車の端部延長部は加熱ローラの開放端部の開口を小さ
くしているので、ここからの放熱は制限される。[Function] In the present invention as described above, when the gear for driving the heating roller is attached to the heating roller, it is fixed to the outer peripheral surface of the heating roller with a screw or the like. Further, since the gear is made of heat-resistant resin, it has a small heat capacity and does not have much effect on the temperature rise C when the heater power is turned on, and starts up relatively quickly. moreover,
The end extension of the gear reduces the opening at the open end of the heating roller, thereby limiting heat dissipation therefrom.
［実施例］
第１図は本発明の第一実施例装置の断面図である。第１
図において、ｌは転写材の未定着現像剤を定着させるた
めに加熱する加熱ローラである。[Embodiment] FIG. 1 is a sectional view of a device according to a first embodiment of the present invention. 1st
In the figure, l is a heating roller that heats the unfixed developer on the transfer material to fix it.
該加熱ローラｌは両端が開放された円筒状をなしており
、内部に加熱用熱源としてのヒータ２が内蔵されている
。該ヒータ２は上記加熱ローラｌの長手方向端部での発
熱量が中央部よりも大きくなるように設定されている。The heating roller l has a cylindrical shape with both ends open, and has a built-in heater 2 as a heating heat source. The heater 2 is set so that the amount of heat generated at the ends of the heating roller l in the longitudinal direction is larger than that at the center.
上記加熱ローラ１は、耐熱樹脂製のすべり軸受３で回転
自在に支えられており、右端外周面に回転駆動を受ける
耐熱樹脂製の歯車４がねじ５にて取り付けられている。The heating roller 1 is rotatably supported by a sliding bearing 3 made of a heat-resistant resin, and a gear 4 made of a heat-resistant resin that is rotatably driven is attached to the outer peripheral surface of the right end with a screw 5.
上記歯車４は加熱ローラｌの端面位置から半径内方へ上
記加熱ローラｌの内径よりも小さくなる位置まで延びる
端部延長部６を一体的に有している。The gear 4 integrally has an end extension 6 extending radially inward from the end surface of the heating roller I to a position smaller than the inner diameter of the heating roller I.
以上のような本実施例によるならば、ヒータ２が発生す
る熱は上記端部延長部６によって加熱ローラｌの端部か
ら放散が制限される。したがって、歯車４の熱容量が小
さいことと相俟って、ヒータ２の電源投入時に上記ヒー
タ２の端部の温度も素早く立ち上がる。その特性の一例
を第２図に示すと、Ａは第１図のヒータ２の左端部、Ｂ
は中央部、Ｃは右端部（歯車取付側端部）におけるそれ
ぞれの温度変化である。なお、室温２０°Ｃ１湿度６０
％の測定環境は従来例を示した第８図の場合と同じであ
る。第２図から明らかなように、第８図の従来例に比し
曲線Ｃはすみやかに温度が定着温度に達している。した
かって、加熱ローラは素早く全体が−様な温度分布とな
るために、ローラ端部での定着不良がなくなり、常に良
好な定着画像を得る。According to this embodiment as described above, the heat generated by the heater 2 is restricted from dissipating from the end of the heating roller l by the end extension 6. Therefore, in combination with the small heat capacity of the gear 4, the temperature at the end of the heater 2 rises quickly when the heater 2 is powered on. An example of the characteristics is shown in FIG. 2. A is the left end of the heater 2 in FIG.
is the temperature change at the center, and C is the temperature change at the right end (end on the gear attachment side). In addition, room temperature: 20°C, humidity: 60°C
The environment for measuring % is the same as in the case of FIG. 8 showing the conventional example. As is clear from FIG. 2, the temperature of curve C reaches the fixing temperature more quickly than in the conventional example shown in FIG. Therefore, the entire heating roller quickly attains a -like temperature distribution, which eliminates fixing defects at the ends of the roller and always provides a good fixed image.
第３図は本発明の第二実施例装置の断面図を示したもの
である。１は、加熱ローラて、耐熱樹脂からなるすべり
軸受３によって回転自在に支えられている点は、前実施
例の場合と同じである。FIG. 3 shows a sectional view of a device according to a second embodiment of the present invention. The heating roller 1 is rotatably supported by a sliding bearing 3 made of heat-resistant resin, as in the previous embodiment.
本実施例では、加熱ローラのヒータに例えばセラミック
ヒータのような面状発熱体を使用している。電力は、電
極を加熱ローラｌの表面に設けることにより、ここから
供給できるので、耐熱樹脂製の駆動用歯車４Ａの端部延
長部６Ａが加熱ローラ１の端部を覆うようにすることが
可能となり、端部放熱防止をより完全に行なえる。In this embodiment, a planar heating element such as a ceramic heater is used as the heater of the heating roller. Electric power can be supplied from an electrode provided on the surface of the heating roller l, so that the end extension 6A of the heat-resistant resin drive gear 4A can cover the end of the heating roller 1. This makes it possible to more completely prevent end heat radiation.
［発明の効果〕
以上説明したように、本発明は、耐熱樹脂からなる駆動
用歯車に端部延長部を一体的に設け、その内径を加熱ロ
ーラの内径より小さくすることにより、加熱ローラの長
手方向における表面温度の均一性か素早く達成されるた
めに、ローラ端部における定着不良をなくすことができ
、常に良好な定着画像か得られるという効果がある。[Effects of the Invention] As explained above, the present invention provides a drive gear made of heat-resistant resin with an end extension, and by making the inner diameter smaller than the inner diameter of the heating roller, the longitudinal length of the heating roller is reduced. Since the uniformity of the surface temperature in the direction is quickly achieved, it is possible to eliminate fusing failures at the ends of the roller, and there is an effect that a good fixed image is always obtained.
さらに、駆動用の歯車か放熱防止部たる端部延長部を一
体成形で得られるようにしたために製造コストを上げる
ことなく上記効果か得られる。Furthermore, since the driving gear and the end extension portion serving as the heat radiation prevention portion can be integrally molded, the above effects can be obtained without increasing the manufacturing cost.
第１図は本発明の第一実施例装置の断面図、第２図は第
１図装置の特性を示す図、第３図は本発明の第二実施例
装置の断面図、第４図は従来装置の側面図、第５図は第
４図装置の断面図、第６図は他の従来装置の断面図、第
７図はさらに他の従来装置の断面図、第８図は第５図装
置の特性を示す図である。
ｌ・・・・・・・−・・・・加熱ローラ２・・・・・・
・・・・・・ヒータ
４：４Ａ・・・・・・歯車
６．６Ａ−・・・・・端部延長部
％
５４FIG. 1 is a cross-sectional view of the device according to the first embodiment of the present invention, FIG. 2 is a diagram showing the characteristics of the device shown in FIG. 1, FIG. 3 is a cross-sectional view of the device according to the second embodiment of the present invention, and FIG. 5 is a sectional view of the device shown in FIG. 4, FIG. 6 is a sectional view of another conventional device, FIG. 7 is a sectional view of another conventional device, and FIG. 8 is a sectional view of the device shown in FIG. 5. FIG. 3 is a diagram showing characteristics of the device. l・・・・・・・・・・・・・Heating roller 2・・・・・・
...Heater 4: 4A ... Gear 6.6A ... End extension % 54
Claims (1)
ローラとを有する定着装置において、加熱ローラは、軸
方向に開放された中空円筒体の内部空間を有し、 上記加熱ローラの端部外周には、該加熱ローラを回転駆
動せしめるための耐熱樹脂製の歯車が取りつけられてお
り、 上記歯車は、上記加熱ローラの端面もしくはそれよりも
軸方向外方位置にて、加熱ローラの端部内径よりも半径
内方に延びる端部延長部を有している、 ことを特徴とする定着装置。[Claims] In a fixing device having a heating roller equipped with a heater and a pressure roller rotating in pressure contact with the heating roller, the heating roller has an internal space of a hollow cylindrical body opened in the axial direction, A gear made of heat-resistant resin is attached to the outer periphery of the end of the roller to rotate the heating roller. A fixing device comprising: an end extension extending radially inward from the inner diameter of the end of the roller.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP19660189A JPH0361978A (en) | 1989-07-31 | 1989-07-31 | Fixing device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP19660189A JPH0361978A (en) | 1989-07-31 | 1989-07-31 | Fixing device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0361978A true JPH0361978A (en) | 1991-03-18 |
Family
ID=16360461
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP19660189A Pending JPH0361978A (en) | 1989-07-31 | 1989-07-31 | Fixing device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0361978A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7348701B2 (en) * | 2003-12-27 | 2008-03-25 | Samsung Electronics Co., Ltd. | Driving unit and image forming apparatus |
| JP2014194443A (en) * | 2013-03-28 | 2014-10-09 | Oki Data Corp | Fixation control device and image forming apparatus |
-
1989
- 1989-07-31 JP JP19660189A patent/JPH0361978A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7348701B2 (en) * | 2003-12-27 | 2008-03-25 | Samsung Electronics Co., Ltd. | Driving unit and image forming apparatus |
| JP2014194443A (en) * | 2013-03-28 | 2014-10-09 | Oki Data Corp | Fixation control device and image forming apparatus |
| US9164439B2 (en) | 2013-03-28 | 2015-10-20 | Oki Data Corporation | Fuser control device and image forming apparatus |
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