JPH0990791A - Fixing device - Google Patents

Fixing device

Info

Publication number
JPH0990791A
JPH0990791A JP25087495A JP25087495A JPH0990791A JP H0990791 A JPH0990791 A JP H0990791A JP 25087495 A JP25087495 A JP 25087495A JP 25087495 A JP25087495 A JP 25087495A JP H0990791 A JPH0990791 A JP H0990791A
Authority
JP
Japan
Prior art keywords
roller
elastic roller
elastic
fixing
pressure
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
JP25087495A
Other languages
Japanese (ja)
Inventor
Yoshiyasu Tanioka
由康 谷岡
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.)
NEC Corp
Original Assignee
NEC Corp
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 NEC Corp filed Critical NEC Corp
Priority to JP25087495A priority Critical patent/JPH0990791A/en
Publication of JPH0990791A publication Critical patent/JPH0990791A/en
Pending legal-status Critical Current

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  • Fixing For Electrophotography (AREA)

Abstract

PROBLEM TO BE SOLVED: To correct the deflection of an elastic roller and prevent the wrinkling of a recording paper by cylindrically forming a fixing roller and the elastic roller making contact with it, and providing a pressure roller driven by the elastic roller on the opposite side to the fixing roller. SOLUTION: A fixing roller 1 and an elastic roller 2 are cylindrically formed (straight form), respectively, and the fixing roller 1 consists of an aluminium hollow roller having a heater lamp installed therein, which has a toner release layer formed on the surface. The elastic roller 2 formed by winding silicon rubber on a cylindrical core metal is pressed onto the fixing roller 1. On the opposite side to the fixing roller through the elastic roller 2, a pressure roller 3 pressed to and driven by the elastic roller 2 is installed, the width of the pressure roller 3 is set to 1/3 or less of the width of the elastic roller 2, and the pressure roller 3 is installed in the center part of the elastic roller 2. Thus, the pressure of a nip part can be substantially uniformed in the axial direction of the elastic roller, and a state of wrinkling a recording paper can be suppressed or prevented.

Description

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

【0001】[0001]

【発明の属する技術分野】本発明は、定着装置に係り、
特に、電子写真システム用の定着装置に関する。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fixing device,
In particular, it relates to a fixing device for an electrophotographic system.

【0002】[0002]

【従来の技術】図3に従来例を示す。この図3に示す定
着装置は、未定着トナー像と接する定着ローラ51と、
これに圧接し従動する弾性ローラ52とを備えている。
この定着ローラ51と弾性ローラ52は、それぞれ円柱
状に形成されている。定着ローラは内部に熱源を備え、
この熱源によってローラ本体を加熱し、各ローラ51,
52間を通過する記録紙上のトナー像を熱と圧力により
定着するようになっている。
2. Description of the Related Art FIG. 3 shows a conventional example. The fixing device shown in FIG. 3 includes a fixing roller 51 that contacts an unfixed toner image,
An elastic roller 52 that is pressed against and is driven by the elastic roller 52 is provided.
The fixing roller 51 and the elastic roller 52 are each formed in a cylindrical shape. The fixing roller has a heat source inside,
The heat source heats the roller body,
The toner image on the recording paper passing between 52 is fixed by heat and pressure.

【0003】しかしながら、この図3に示す定着装置で
は、弾性ローラ52の軸受け部分に定着ローラ方向の荷
重fが加えられるので、図中の2点鎖線に示すように弾
性ローラ52がたわみ変形し、これがため、このローラ
51,52間を通過する記録紙にしわが発生する不都合
があった。
However, in the fixing device shown in FIG. 3, since the load f in the direction of the fixing roller is applied to the bearing portion of the elastic roller 52, the elastic roller 52 is flexibly deformed as shown by the chain double-dashed line in the figure, For this reason, there is an inconvenience that the recording paper passing between the rollers 51 and 52 is wrinkled.

【0004】一方、この記録紙のしわを防止する為に、
定着ローラ51aを逆クラウン形状とし、弾性ローラ
52aをストレート形状にする手法が提案されている
(図4(a))。これによると、記録紙の搬送速度をロ
ーラの中央よりも端部で速くすることができ、記録紙中
央部に向かう応力によりしわの発生を防止することがで
きる。また、この手法の変形例も種々提案されている。
On the other hand, in order to prevent wrinkles on the recording paper,
A method has been proposed in which the fixing roller 51a has an inverted crown shape and the elastic roller 52a has a straight shape (FIG. 4A). According to this, the conveyance speed of the recording paper can be made higher at the end portion than at the center of the roller, and wrinkles can be prevented from being generated due to the stress toward the central portion of the recording paper. Also, various modifications of this method have been proposed.

【0005】例えば、A2 、A1 といった大サイズ記録
紙を使用する場合は、図4(b)に示すように、定着
ローラ51bをストレート形状にすると共に、弾性ロー
ラ52bをクラウン形状とし、中央部の応力を端部より
高め、これによりしわの発生を防止することができる
(特開平2−173687号公報)。
For example, when using a large size recording paper such as A 2 or A 1, as shown in FIG. 4 (b), the fixing roller 51b has a straight shape and the elastic roller 52b has a crown shape and has a center shape. It is possible to increase the stress of the portion higher than that of the end portion and thereby prevent the generation of wrinkles (Japanese Patent Laid-Open No. 2-173687).

【0006】また、この他にも、図4(c)の定着ロ
ーラ51cを逆クラウン形状にすると共に、弾性ローラ
52cをクラウン形状とする手法(特開平2−3685
4号公報)や、図4(d)の定着ローラ51dを逆ク
ラウン形状とし、弾性ローラ52dをストレート形状と
すると共に、両ローラを軸交差させ、これにより、中央
部と両端のニップ幅の差を小さくしてしわを防止する手
法(特開昭60−128472号公報)等が提案されて
いる。
In addition to this, the fixing roller 51c shown in FIG. 4 (c) has an inverted crown shape and the elastic roller 52c has a crown shape (Japanese Patent Laid-Open No. 2-3685).
No. 4) or the fixing roller 51d of FIG. 4D has an inverted crown shape, the elastic roller 52d has a straight shape, and both rollers are axially crossed, whereby the difference in nip width between the central portion and both ends is increased. A method of reducing wrinkles to prevent wrinkles (Japanese Patent Laid-Open No. 60-128472) has been proposed.

【0007】[0007]

【発明が解決しようとする課題】しかしながら、上記従
来例にあっては、ローラがクラウン形状または逆クラウ
ン形状を採るので、高温環境下でのクリープ変形や記録
紙との摩擦による磨耗等によりローラの形状が失なわ
れ、しわ防止の効果が装置寿命以前に低下する不都合が
あった。特に、軸交差によってしわを防止する案にあ
っては、記録紙に定着したトナー像の定着強度がローラ
の左右端及び中央において不均一となる不都合があっ
た。
However, in the above-mentioned conventional example, since the roller has a crown shape or an inverted crown shape, the roller is not deformed due to creep deformation in a high temperature environment or abrasion due to friction with the recording paper. There is a problem that the shape is lost and the effect of preventing wrinkles is reduced before the life of the device. In particular, in the plan to prevent wrinkles by crossing the axes, there is a disadvantage that the fixing strength of the toner image fixed on the recording paper becomes uneven at the left and right ends and the center of the roller.

【0008】[0008]

【発明の目的】本発明は、上記従来例の有する不都合を
改善し、特に、ストレート形状の定着ローラ及び弾性ロ
ーラを用いつつ、記録紙のしわの発生を防止できる定着
装置を提供することをその目的とする。
SUMMARY OF THE INVENTION It is an object of the present invention to provide a fixing device capable of preventing the wrinkles of a recording paper while improving the disadvantages of the above-mentioned conventional examples and, in particular, using a straight fixing roller and an elastic roller. To aim.

【0009】[0009]

【課題を解決するための手段】請求項1記載の発明で
は、未定着トナー像と接する定着ローラと、これに圧接
し従動する弾性ローラとを備えている。この定着ローラ
と弾性ローラはそれぞれ円柱状に形成されている。そし
て、弾性ローラに圧接し従動する圧接ローラを定着ロー
ラの反対側に装備した、という構成を採っている。この
ため、本発明では、圧接ローラの圧接力により弾性ロー
ラのたわみが矯正される。
According to the present invention, there is provided a fixing roller which is in contact with the unfixed toner image, and an elastic roller which is pressed against and is driven by the fixing roller. The fixing roller and the elastic roller are each formed in a cylindrical shape. Further, a structure is employed in which a pressure contact roller that is in pressure contact with the elastic roller and is driven is provided on the opposite side of the fixing roller. Therefore, in the present invention, the bending of the elastic roller is corrected by the pressing force of the pressing roller.

【0010】請求項2記載の発明では、上記圧接ローラ
を、弾性ローラの幅の1/3以下の幅に設定すると共
に、当該弾性ローラの中央部に装備した、という構成を
採っている。このため、本発明では、最もたわみ易い弾
性ローラの中央部のたわみが矯正される。
According to a second aspect of the present invention, the pressure contact roller is set to have a width that is ⅓ or less of the width of the elastic roller and is equipped in the central portion of the elastic roller. Therefore, in the present invention, the bending of the central portion of the elastic roller, which is the most flexible, is corrected.

【0011】請求項3記載の発明では、上記圧接ローラ
を、複数に分割装備した、という構成を採っている。こ
のため、本発明では、複数の圧接ローラの圧接力及び圧
接位置を調整することにより、弾性ローラのたわみが確
実に矯正される。
According to the third aspect of the present invention, the pressure contact roller is divided into a plurality of parts. Therefore, in the present invention, the deflection of the elastic roller is reliably corrected by adjusting the pressure contact force and the pressure contact position of the plurality of pressure contact rollers.

【0012】これらにより、前述した目的を達成しよう
とするものである。
[0012] With these, the above-mentioned object is to be achieved.

【0013】[0013]

【発明の実施の形態】以下、本発明の一実施形態を図1
乃至図2に基づいて説明する。
BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the present invention will be described below with reference to FIG.
It will be described with reference to FIG.

【0014】図1乃至図2に示す定着装置は、未定着ト
ナー像と接する定着ローラ1と、これに圧接し従動する
弾性ローラ2とを備えている。これら定着ローラ1と弾
性ローラ2は、それぞれ円柱状(ストレート形状)に形
成されている。また、弾性ローラ2を介し定着ローラ1
の反対側には、当該弾性ローラ2に圧接し従動する圧接
ローラ3が装備されている。この圧接ローラ3は、弾性
ローラ2の幅の1/3以下の幅に設定され、当該弾性ロ
ーラ2の中央部に装備されている。
The fixing device shown in FIGS. 1 and 2 comprises a fixing roller 1 which is in contact with an unfixed toner image, and an elastic roller 2 which is pressed against and is driven by the fixing roller 1. The fixing roller 1 and the elastic roller 2 are each formed in a columnar shape (straight shape). In addition, the fixing roller 1 via the elastic roller 2
On the side opposite to the above, a pressure contact roller 3 that is in pressure contact with the elastic roller 2 and is driven is provided. The pressure contact roller 3 is set to have a width that is ⅓ or less of the width of the elastic roller 2 and is provided at the center of the elastic roller 2.

【0015】これを更に詳述すると、定着ローラ1は、
アルミ製の中空ローラであり、内部には熱源としてのヒ
ータランプ(図示略)が装備されている。また、定着ロ
ーラ1の表面には、PTFEコーティング又はPFAコ
ーティングが施され、これによりトナー離型層が形成さ
れている。定着ローラ1の回転軸は、その両端で軸受け
され、回転自在に支持されている(図示略)。定着ロー
ラ1の回転軸は、モータ等の外部動力により回転駆動さ
れるようになっている。
More specifically, the fixing roller 1 is composed of
It is a hollow roller made of aluminum, and is equipped with a heater lamp (not shown) as a heat source inside. The surface of the fixing roller 1 is coated with PTFE or PFA to form a toner release layer. The rotary shaft of the fixing roller 1 is rotatably supported by its both ends (not shown). The rotation shaft of the fixing roller 1 is rotationally driven by external power such as a motor.

【0016】一方、弾性ローラ2は、円柱状の芯金2a
に硬度30°±5°のシリコンゴム2bを巻装したもの
である。弾性ローラ2の回転軸(芯金2a)は、その軸
受けされる両端部で定着ローラ1向きの荷重f1 を受
け、これにより、弾性ローラ2が定着ローラ1に圧接さ
れている。
On the other hand, the elastic roller 2 comprises a cylindrical core metal 2a.
A silicone rubber 2b having a hardness of 30 ° ± 5 ° is wound around the. The rotating shaft (core metal 2a) of the elastic roller 2 receives a load f 1 directed toward the fixing roller 1 at both ends where it is supported, whereby the elastic roller 2 is pressed against the fixing roller 1.

【0017】また、圧接ローラ3は、円柱状の芯金3a
の表面にトナー離型層としてPTFEコーティング又は
PFAコーティングを施したものである。圧接ローラ3
の回転軸(芯金3a)は、その軸受けされる両端部で弾
性ローラ2向きの荷重f2 を受け、これにより、圧接ロ
ーラ3が弾性ローラ2に圧接されている。
The pressure contact roller 3 has a cylindrical core metal 3a.
Is coated with PTFE or PFA as a toner release layer. Pressure contact roller 3
The rotating shaft (core metal 3a) receives a load f 2 directed toward the elastic roller 2 at both ends thereof, whereby the pressing roller 3 is pressed against the elastic roller 2.

【0018】そして、装置全体を稼動状態に設定する
と、ヒータランプにより表面が加熱された定着ローラ1
が回転駆動され、表面にトナー像が形成された記録紙が
当該定着ローラ1と弾性ローラ2との圧接部に搬送され
る。これにより、定着ローラ1の熱を受けたトナー像は
記録紙上に熱定着されてゆく。
When the entire apparatus is set to the operating state, the fixing roller 1 whose surface is heated by the heater lamp
Is rotationally driven, and the recording paper on the surface of which the toner image is formed is conveyed to the pressure contact portion between the fixing roller 1 and the elastic roller 2. As a result, the toner image that receives the heat of the fixing roller 1 is thermally fixed on the recording paper.

【0019】このとき、弾性ローラ2の芯金2aには、
その両端に荷重f1 が加えらているため、芯金2a全体
にたわみを生ずるような応力が作用する。ここで、実際
に芯金2aにたわみを生じたならば、ニップ部の圧接力
が弾性ローラ2の両端より中央で弱くなり、記録紙には
ローラ中央向きのストレスが付勢され、搬送される記録
紙にはしわが生ずる。
At this time, the core metal 2a of the elastic roller 2 is
Since the load f 1 is applied to both ends of the core metal 2a, a stress that causes bending is applied to the entire core metal 2a. Here, if the core metal 2a is actually bent, the pressure contact force of the nip portion becomes weaker at the center than at both ends of the elastic roller 2, and the recording paper is urged by the stress toward the roller center and conveyed. Wrinkles occur on the recording paper.

【0020】一方、本実施形態では、圧接ローラ3が、
その芯金3aに印加された荷重f2によって弾性ローラ
2の中央部に圧接されているため、当該圧接力により弾
性ローラ2の芯金2aに生じようとするたわみが矯正さ
れる。
On the other hand, in this embodiment, the pressure contact roller 3 is
Since the load f 2 applied to the cored bar 3a is pressed against the central portion of the elastic roller 2, the bending force that is generated in the cored bar 2a of the elastic roller 2 is corrected by the pressing force.

【0021】ここで、圧接ローラ3の芯金3aに印加す
る荷重f2 は、弾性ローラ2の中央部に生じるたわみを
有効に抑制乃至防止できるよう、かつ、ニップ部の圧力
がローラの両端と中央とで均一となるように実験的に最
適値を設定する必要がある。
Here, the load f 2 applied to the core metal 3a of the pressure contact roller 3 can effectively suppress or prevent the deflection generated at the central portion of the elastic roller 2, and the pressure at the nip portion is applied to both ends of the roller. It is necessary to experimentally set the optimum value so that it becomes uniform in the center.

【0022】このように、本実施形態によれば、弾性ロ
ーラに圧接し従動する圧接ローラを定着ローラの反対側
に装備したので、ニップ部の圧力を弾性ローラの軸方向
においてほぼ均一とすることができ、これにより、記録
紙にしわが発生する事態を抑制乃至防止することができ
る。
As described above, according to the present embodiment, since the pressure contact roller that is in pressure contact with the elastic roller and is driven by the elastic roller is provided on the opposite side of the fixing roller, the pressure in the nip portion should be substantially uniform in the axial direction of the elastic roller. This makes it possible to suppress or prevent the occurrence of wrinkles on the recording paper.

【0023】また、弾性ローラの1/3以下の幅を有す
る圧接ローラを弾性ローラの中央部に装備したので、ニ
ップ部の圧力が最も弱くなる中央部のみを矯正すること
ができると共に、その他の部分には圧接力が直接及ばな
いので、圧接ローラの最適な圧接力の設定を容易に行う
ことができる。
Further, since the pressure contact roller having a width of ⅓ or less of the elastic roller is provided in the central portion of the elastic roller, it is possible to correct only the central portion where the pressure in the nip portion is the weakest, and other Since the pressure contact force does not directly reach the portion, it is possible to easily set the optimum pressure contact force of the pressure contact roller.

【0024】ここで、本実施形態によらず、圧接ローラ
3を複数に分割装備し、弾性ローラ2の軸方向に並列に
複数装備しても良い。かかる場合、各圧接ローラを所定
位置に所定圧力で配置することにより、ニップ部の圧力
を弾性ローラの軸方向において高精度に均一化すること
ができる。
Here, regardless of this embodiment, the pressure roller 3 may be divided into a plurality of pieces, and a plurality of pieces may be arranged in parallel in the axial direction of the elastic roller 2. In such a case, by arranging each pressure contact roller at a predetermined position with a predetermined pressure, the pressure at the nip portion can be made uniform with high accuracy in the axial direction of the elastic roller.

【発明の効果】本発明は、以上のように構成され機能す
るので、これによると、弾性ローラに圧接し従動する圧
接ローラを定着ローラの反対側に装備したので、ニップ
部の圧力を弾性ローラの軸方向においてほぼ均一とする
ことができ、これにより、記録紙にしわが発生する事態
を抑制乃至防止することができる。
Since the present invention is constructed and functions as described above, according to the present invention, the pressure roller which is pressed against and driven by the elastic roller is provided on the opposite side of the fixing roller. Can be made substantially uniform in the axial direction, and thus the occurrence of wrinkles on the recording paper can be suppressed or prevented.

【0025】請求項2記載の発明では、弾性ローラの1
/3以下の幅を有する圧接ローラを弾性ローラの中央部
に装備したので、ニップ部の圧力が最も弱くなる中央部
のみを矯正することができると共に、その他の部分には
圧接力が直接及ばないので、圧接ローラの最適な圧接力
の設定を容易に行うことができる。
According to the second aspect of the invention, the elastic roller 1 is provided.
Since a pressure roller having a width of / 3 or less is provided in the central portion of the elastic roller, only the central portion where the pressure in the nip portion is weakest can be corrected, and the pressure contact force does not directly reach other portions. Therefore, it is possible to easily set the optimum pressure contact force of the pressure contact roller.

【0026】請求項3記載の発明では、各圧接ローラを
所定位置に所定圧力で配置することにより、ニップ部の
圧力を弾性ローラの軸方向において高精度に均一化する
ことができる、という従来にない優れた定着装置を提供
することができる。
According to the third aspect of the present invention, by arranging each pressure contact roller at a predetermined position at a predetermined pressure, the pressure at the nip portion can be made uniform with high accuracy in the axial direction of the elastic roller. It is possible to provide an excellent fixing device that does not have such a structure.

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

【図1】本発明の一実施形態を示す概略正面図である。FIG. 1 is a schematic front view showing an embodiment of the present invention.

【図2】図1に示す実施形態の概略側面図である。FIG. 2 is a schematic side view of the embodiment shown in FIG.

【図3】従来例の構成を示す概略正面図である。FIG. 3 is a schematic front view showing the configuration of a conventional example.

【図4】従来例の構成を示す概略正面図であり、図4
(a)〜図4(d)は、それぞれ変形例を示す。
FIG. 4 is a schematic front view showing a configuration of a conventional example.
(A) -FIG.4 (d) each show a modification.

【符号の説明】[Explanation of symbols]

1 定着ローラ 2 弾性ローラ 3 圧接ローラ 1 Fixing roller 2 Elastic roller 3 Pressing roller

Claims (3)

【特許請求の範囲】[Claims] 【請求項1】 未定着トナー像と接する定着ローラと、
これに圧接し従動する弾性ローラとを備えた定着装置に
おいて、 前記定着ローラと弾性ローラをそれぞれ円柱状に形成す
ると共に、前記弾性ローラに圧接し従動する圧接ローラ
を前記定着ローラの反対側に装備したことを特徴とする
定着装置。
1. A fixing roller in contact with an unfixed toner image,
In a fixing device including an elastic roller which is pressed against and is driven by the fixing roller, the fixing roller and the elastic roller are each formed in a cylindrical shape, and a pressing roller which is pressed against the elastic roller and is driven is provided on the opposite side of the fixing roller. The fixing device characterized in that
【請求項2】 前記圧接ローラを、前記弾性ローラの幅
の1/3以下の幅に設定すると共に、当該弾性ローラの
中央部に装備したことを特徴とする請求項1記載の定着
装置。
2. The fixing device according to claim 1, wherein the pressure contact roller is set to have a width of ⅓ or less of the width of the elastic roller, and is provided in the central portion of the elastic roller.
【請求項3】 前記圧接ローラを、複数に分割装備した
ことを特徴とする請求項1記載の定着装置。
3. The fixing device according to claim 1, wherein the pressure contact roller is divided into a plurality of parts.
JP25087495A 1995-09-28 1995-09-28 Fixing device Pending JPH0990791A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP25087495A JPH0990791A (en) 1995-09-28 1995-09-28 Fixing device

Applications Claiming Priority (1)

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JP25087495A JPH0990791A (en) 1995-09-28 1995-09-28 Fixing device

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JPH0990791A true JPH0990791A (en) 1997-04-04

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7421236B2 (en) 2005-07-28 2008-09-02 Samsung Electronics Co., Ltd. Fixing unit including backup pressure members and image forming apparatus having the same

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH05297759A (en) * 1992-04-22 1993-11-12 Minolta Camera Co Ltd Fixing device

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH05297759A (en) * 1992-04-22 1993-11-12 Minolta Camera Co Ltd Fixing device

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7421236B2 (en) 2005-07-28 2008-09-02 Samsung Electronics Co., Ltd. Fixing unit including backup pressure members and image forming apparatus having the same

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