JP2720616B2 - Heat fixing device - Google Patents
Heat fixing deviceInfo
- Publication number
- JP2720616B2 JP2720616B2 JP3062859A JP6285991A JP2720616B2 JP 2720616 B2 JP2720616 B2 JP 2720616B2 JP 3062859 A JP3062859 A JP 3062859A JP 6285991 A JP6285991 A JP 6285991A JP 2720616 B2 JP2720616 B2 JP 2720616B2
- Authority
- JP
- Japan
- Prior art keywords
- roller
- heating roller
- heating
- heat
- fixing device
- 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.)
- Expired - Lifetime
Links
Description
【０００１】[0001]
【産業上の利用分野】本発明は、加熱ローラでトナーを
用紙に定着させる加熱定着装置に関する。BACKGROUND OF THE INVENTION The present invention is a toner in heat roller
Ru is fixed on the paper about the pressurized heat fixing device.
【０００２】[0002]
【従来の技術】加熱ローラでトナーを用紙に定着させる
加熱定着装置はすでに一般に知られている。 Ru is fuse the toner to the paper in the Background of the heating roller
Pressurized heat fixing device already generally known.
【０００３】以下に、加熱定着装置の構成について図１
から図３を参照しながら説明する。FIG. 1 shows the structure of a heat fixing device.
This will be described with reference to FIG.
【０００４】図に示すように、両側に立設された軸支板
１，１に回転自在に軸支された中空の加熱ローラ２は所
定の長さを有し、中央部の直径Ｄ1は両端部の直径Ｄ2よ
りも０．１mm程度細い鼓形に形成されている。加熱ロー
ラ２には直径が一様な加圧ローラ３が両端部に配設され
たゴム製の加圧ローラ３が両端部に配設された圧接手段
４，４により圧接されている。そして、加熱ローラ２と
加圧ローラ３は同期して回転し、トナーが電着された複
写用紙を加圧して搬送し、トナーを複写用紙に加熱定着
させる。この複写用紙の搬送において、加熱ローラ２に
形成された中央部と両端部の直径差、つまり、テーパー
と直径が一様な加圧ローラ３とによって複写用紙の中央
部を押え、複写用紙に生じるシワを防止している。As shown in the figure, a hollow heating roller 2 rotatably supported by shaft supporting plates 1 and 1 provided on both sides has a predetermined length, and a central portion has a diameter D 1. It is formed on 0.1mm approximately slender hourglass than the diameter D 2 of the opposite end portions. A pressure roller 3 made of rubber and having a uniform diameter at both ends is pressed against the heating roller 2 by pressing means 4 and 4 disposed at both ends. Then, the heating roller 2 and the pressure roller 3 rotate in synchronization with each other, and pressurize and transport the copy sheet on which the toner is electrodeposited, and heat and fix the toner on the copy sheet. In the conveyance of the copy sheet, the central portion of the copy sheet is pressed by the pressure roller 3 having a uniform diameter and a difference in diameter between the central portion and both ends formed on the heating roller 2, and is generated on the copy sheet. Wrinkles are prevented.
【０００５】圧接手段４は、軸支板１，１上を加圧ロー
ラ３方向に摺動自在な軸受５と、軸受５を加圧ローラ３
方向に付勢するばね６とで形成され、軸受５が加圧ロー
ラ３を回転自在に支承している。The pressing means 4 includes a bearing 5 slidable on the shaft supporting plates 1 and 1 in the direction of the pressure roller 3, and a bearing 5 for connecting the bearing 5 to the pressure roller 3.
A bearing 5 rotatably supports the pressure roller 3.
【０００６】加熱ローラ２の中空部には加熱ローラ２を
加熱するコイル状の加熱手段７が貫通して配設されてい
る。そして、加熱手段７は、一般的に加熱ローラ２の両
端部の温度が低くなることを考慮して、図３（ａ）の点
線で示したように、加熱ローラ２の表面温度を中央部と
両端部とが均一になるように、図２に示したように両端
部のコイル８，８の間隔を密に、中央部のコイル９，９
の間隔を疎に形成されている。A coil-shaped heating means 7 for heating the heating roller 2 is provided through the hollow portion of the heating roller 2. The heating means 7 sets the surface temperature of the heating roller 2 at the center as shown by the dotted line in FIG. As shown in FIG. 2, the distance between the coils 8, 8 at the both ends is increased and the coils 9, 9 at the center are arranged so as to make the both ends uniform.
Are formed sparsely.
【０００７】[0007]
【発明が解決しようとする課題】トナーの複写用紙への
定着強度は、圧接力，定着温度、定着時間の各要素に影
響されるものである。The fixing strength of the toner to the copy paper is affected by factors such as the pressing force, the fixing temperature, and the fixing time.
【０００８】まず、圧接力についてであるが、上記した
構成のものでは、加圧ローラ３がその両端部で付勢され
て加熱ローラ２に圧接されているため、加圧ローラ３の
中央部の僅かの撓みや加熱ローラ２のテーパーによって
両端部の圧接力に比べて中央部の圧接力は相対的に弱い
ものとなり、これにより、図３（ｂ）の点線で示したよ
うに中央部の定着強度が弱くなって軸方向の定着ムラが
生じるという問題があった。First, with regard to the pressure contact force, in the above-described configuration, since the pressure roller 3 is urged at both ends and pressed against the heating roller 2, the pressure roller 3 is located at the center of the pressure roller 3. Due to the slight bending and the taper of the heating roller 2, the pressing force at the central portion becomes relatively weaker than the pressing force at both ends, and as a result, as shown by the dotted line in FIG. There has been a problem that the strength becomes weak and uneven fixing in the axial direction occurs.
【０００９】これに対して、中央部の定着強度を得るた
めに圧接力を強くすると、図３（ｂ）に斜線に示したよ
うに、両端部の定着強度が必要以上ものとなり、両ロー
ラの回転のためのエネルギーに無駄が生じるという問題
があった。On the other hand, when the pressing force is increased to obtain the fixing strength at the center, the fixing strength at both ends becomes more than necessary as shown by the diagonal lines in FIG. There is a problem that energy for rotation is wasted.
【００１０】次に、定着温度についてであるが、加熱ロ
ーラ２の表面温度を均一になるようにしているが、上記
した圧接力について説明と同様の理由で両端部の圧接力
が中央部の圧接力より強くなるため、両端部では所要の
温度で加熱されるが、中央部は熱の伝達が遅れるので所
要の温度より低い温度で加熱されることとなり、これに
より中央部の定着温度が弱くなって軸方向の定着ムラが
生じるという問題があった。これに対して、中央部を適
正な温度で加熱するように加熱ローラ２の表面温度を均
一に高くすると、図３（ａ）の斜線に示すように、両端
部が必要以上の温度で加熱され、エネルギーを無駄に消
費するという問題があった。Next, with regard to the fixing temperature, the surface temperature of the heating roller 2 is made uniform. However, the pressing force at both ends is changed to the pressing force at the center for the same reason as described above. Because the heat is stronger than the force, both ends are heated at the required temperature, but the central part is heated at a lower temperature than the required temperature because the heat transfer is delayed, which lowers the fixing temperature at the central part. Therefore, there is a problem that uneven fixing occurs in the axial direction. On the other hand, when the surface temperature of the heating roller 2 is uniformly increased so as to heat the central portion at an appropriate temperature, both ends are heated at a temperature higher than necessary as shown by the oblique line in FIG. However, there is a problem that energy is wasted.
【００１１】なお、定着時間は本構成と直接関係しない
ので触れない。本発明は、上記課題を解決するもので、
軸方向の定着強度を均一なものとすることのできる加熱
定着装置を提供することを目的としている。Since the fixing time is not directly related to the present configuration, it is not described. The present invention solves the above problems,
And its object is to provide a can Ru pressurized thermal fixing device to the fixing strength in the axial direction made uniform.
【００１２】[0012]
【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、中央部が両端部より細く形成された加熱ロ
ーラと、この加熱ローラに圧接して設けられるとともに
この加熱ローラよりローラの長さが短く成形され加熱ロ
ーラの両端にはローラが接しないように配設された加圧
ローラと、加熱ローラを加熱する加熱手段とを備え、加
熱ローラの表面温度を中央部から両端部へいくに従って
低くしたものである。The present invention SUMMARY OF] In order to achieve the above object, a heat roller which central portion is formed thinner than both end portions, is provided in pressure contact with the heating roller Rutotomoni
The length of the roller is shorter than this heating roller,
A roller is provided at both ends of the roller so that the roller is not in contact with the heating roller, and heating means for heating the heating roller is provided, and the surface temperature of the heating roller increases from the center to both ends.
Those were low-comb.
【００１３】[0013]
【作用】本発明は上記した構成により、加熱ローラの中
央部の表面温度を両端部の表面温度よりも高くしたこと
により、加圧ローラの加熱ローラへの圧接力が両端部よ
り中央部の方が弱い場合にも中央部の熱の伝達の遅れを
補うことができるので、軸方向の定着ムラをなくし、定
着強度を均一なものとすることができる。According to the present invention, since the surface temperature of the central portion of the heating roller is higher than the surface temperatures of both ends, the pressing force of the pressure roller against the heating roller is closer to the central portion than to both ends. Even when the temperature is weak, the delay in the heat transfer in the central portion can be compensated, so that the fixing unevenness in the axial direction can be eliminated and the fixing strength can be made uniform.
【００１４】[0014]
【実施例】以下、本発明の一実施例について図１から図
３を参照しながら説明する。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to FIGS.
【００１５】なお、加熱定着装置の構成は従来例のもの
と同じであるので説明を省略する。[0015] Since the structure of the pressurized heat fixing device is the same as that of the conventional example will not be described.
【００１６】加熱ローラ２の表面温度は、図３（ａ）の
実線で示したように、中央部を両端部よりも５℃〜１０
℃高くしている。The surface temperature of the heating roller 2 is, as shown by the solid line in FIG.
℃ higher.
【００１７】この温度配分は加熱ローラ２の加熱手段７
の両端部と中央部のコイル８，８，９，９のそれぞれの
間隔を調整することにより容易に得られるもので、上記
した温度差を加減することも自在にできるものである。This temperature distribution depends on the heating means 7 of the heating roller 2.
It can be easily obtained by adjusting the distance between each of the coils 8, 8, 9, 9 at both ends and the center, and the above-mentioned temperature difference can be freely adjusted.
【００１８】上記した構成において、構成上、加圧ロー
ラ３の加熱ローラ２への圧接力が両端部に比べて中央部
が相対的に弱くなることは避けられないが、これによる
中央部の定着強度の弱さを温度で補い、図３（ｂ）に実
線で示したように軸方向の定着ムラをなくし、定着強度
を均一なものとすることができる。In the above configuration, it is unavoidable that the pressing force of the pressure roller 3 against the heating roller 2 is relatively weak in the central portion as compared with the both end portions. The weakness of the strength is compensated by the temperature, and the fixing unevenness in the axial direction can be eliminated as shown by the solid line in FIG. 3B, and the fixing strength can be made uniform.
【００１９】[0019]
【発明の効果】以上の実施例の説明から明らかなよう
に、本発明によれば、加熱ローラの表面温度を中央部か
ら両端部へいくに従って低くしたことにより、加圧ロー
ラの加熱ローラへの圧接力が両端部より中央部の方が弱
い場合にも中央部の熱の伝達の遅れを補うことができる
ので、軸方向の定着ムラをなくし、定着強度を均一なも
のとすることができるとともに、加熱ローラの表面温度
を中央部から両端部へいくに従って低くした場合でも、
加圧ローラは加熱ローラの両端部に接しないため、加熱
ローラ両端の急激な温度低下を防止することができ、軸
方向両側の定着強度の低下を防止し、定着ムラをよりい
っそう無くすことのできる加熱定着装置を提供すること
ができる。また、加圧ローラの径を加熱ローラの径より
小さくしたことにより、加圧ローラの加熱ローラに対す
る熱容量が小さくなるため加圧ローラが加熱ローラに接
している部分と接していない部分との境目での温度変化
を小さくすることができる。 As is apparent from the above description of the embodiment, according to the present invention, the surface temperature of the heating roller is set at the central portion.
By was low comb toward the Luo both ends, it is possible to press-contact force of the heating roller of the pressure roller compensate for delay in transfer of heat of the central portion even when weak towards the central portion from both end portions, Fixing uneven fixing in the axial direction, uniform fixing strength, and the surface temperature of the heating roller
Even if you lower from the center to both ends,
Since the pressure roller does not contact both ends of the heating roller,
A sharp drop in temperature at both ends of the roller can be prevented.
Prevents a decrease in fixing strength on both sides in the direction
It is possible to provide a heat fixing device that can be eliminated . Also, make the diameter of the pressure roller larger than the diameter of the heating roller.
By reducing the size, the pressure roller
Pressure roller is in contact with the heating roller
Temperature change at the boundary between the heated part and the non-contacted part
Can be reduced.
【図１】（ａ）は加熱定着装置の構成を示す正面図 （ｂ）は同側面図1 (a) is a front view showing the structure of a pressure heat fixing device (b) is a side view of the same
【図２】加熱手段の構成を示す正面図FIG. 2 is a front view showing a configuration of a heating unit.
【図３】（ａ）は本発明の一実施例と従来例の加熱ロー
ラの表面温度を示す特性図 （ｂ）は本発明の一実施例と従来例の定着強度を比較し
て示す特性図FIG. 3A is a characteristic diagram showing the surface temperature of a heating roller according to one embodiment of the present invention and a conventional example, and FIG. 3B is a characteristic diagram comparing the fixing strength between the embodiment of the present invention and a conventional example.
２ 加熱ローラ ３ 加圧ローラ ４ 圧接手段 ７ 加熱手段 Ｄ1 加熱ローラの中央部の直径 Ｄ2 加熱ローラの両端部の直径2 Heating roller 3 Pressure roller 4 Pressing means 7 Heating means D 1 Diameter of central part of heating roller D 2 Diameter of both ends of heating roller
Claims (2)
ーラと、前記加熱ローラに圧接して設けられるとともに
該加熱ローラよりローラの長さが短く成形され該加熱ロ
ーラの両端にはローラが接しないように配設された加圧
ローラと、前記加熱ローラ内に配設され前記加熱ローラ
を加熱する加熱手段とを備え、記録媒体に形成されたト
ナー像を熱により記録媒体へ定着する加熱定着装置であ
って、前記加熱ローラの表面温度を中央部から両端部へ
いくに従って低くしたことを特徴とする加熱定着装置。1. A heating roller central portion is molded thinner than both end portions, is provided in pressure contact with the heating roller Rutotomoni
The length of the roller is shorter than that of the heating roller.
A roller provided at both ends of the roller so that the roller does not come into contact with the roller, and heating means disposed within the heating roller to heat the heating roller, and a toner image formed on a recording medium is provided. A heat fixing device for fixing to a recording medium by heat, wherein a surface temperature of the heating roller is changed from a center to both ends.
Heat fixing device, characterized in that had low comb toward.
より小さいことを特徴とする請求項１記載の画像形成装
置。2. The image forming apparatus according to claim 1, wherein a diameter of said pressure roller is smaller than a diameter of said heating roller.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3062859A JP2720616B2 (en) | 1991-03-27 | 1991-03-27 | Heat fixing device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3062859A JP2720616B2 (en) | 1991-03-27 | 1991-03-27 | Heat fixing device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH04296787A JPH04296787A (en) | 1992-10-21 |
| JP2720616B2 true JP2720616B2 (en) | 1998-03-04 |
Family
ID=13212446
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3062859A Expired - Lifetime JP2720616B2 (en) | 1991-03-27 | 1991-03-27 | Heat fixing device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2720616B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003297530A (en) * | 2002-04-01 | 2003-10-17 | Canon Inc | Heating device and fixing device |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5476239A (en) * | 1977-11-30 | 1979-06-18 | Fujitsu Ltd | Fixing device using heating roller |
| JPS6311979A (en) * | 1986-03-12 | 1988-01-19 | Hitachi Metals Ltd | Heat roll for electrophotography |
-
1991
- 1991-03-27 JP JP3062859A patent/JP2720616B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH04296787A (en) | 1992-10-21 |
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