JPH0572933A - Fixing device for electrophotographic copying device - Google Patents
Fixing device for electrophotographic copying deviceInfo
- Publication number
- JPH0572933A JPH0572933A JP25957691A JP25957691A JPH0572933A JP H0572933 A JPH0572933 A JP H0572933A JP 25957691 A JP25957691 A JP 25957691A JP 25957691 A JP25957691 A JP 25957691A JP H0572933 A JPH0572933 A JP H0572933A
- Authority
- JP
- Japan
- Prior art keywords
- fixing
- fixing roller
- roller
- fixing device
- 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
Landscapes
- Fixing For Electrophotography (AREA)
- Delivering By Means Of Belts And Rollers (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】この発明は、レ−ザを用いた、プ
リンタ・複写機・ファクシミリなど、電子写真方式（感
光体に形成した画像をシ−トに転写して記録を行う方
式）によりシ−トに記録を行う電子写真装置に適用しう
る。詳しくは、そのような電子写真装置において、加圧
ロ−ラを円筒形状の定着ロ−ラに押し当て、それら加圧
ロ−ラと定着ロ−ラ間にシ−トを通してそのシ−ト上の
転写画像を定着する定着器に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is based on an electrophotographic system (a system for transferring an image formed on a photoconductor to a sheet for recording) using a laser, such as a printer, a copying machine and a facsimile. It can be applied to an electrophotographic apparatus for recording on a sheet. More specifically, in such an electrophotographic apparatus, a pressure roller is pressed against a cylindrical fixing roller, and a sheet is passed between the pressure roller and the fixing roller so that the sheet is placed on the sheet. And a fixing device for fixing the transfer image of
【０００２】[0002]
【従来の技術】従来、この種定着器では、例えば図１１
に示すように、板状のヒ−タ１を円筒状の定着ロ−ラ２
内に通してバネ３でヒ−タ１の両端を付勢して定着ロ−
ラ２の内面に押し当てて接触させ、定着ロ−ラ２を加熱
するようにしたものがあった。2. Description of the Related Art Conventionally, in this type of fixing device, for example, FIG.
As shown in FIG. 1, a plate-shaped heater 1 is attached to a cylindrical fixing roller 2
Pass through both ends of the heater 1 with springs 3 and fix the fixing roller.
In some cases, the fixing roller 2 was heated by pressing it against the inner surface of the fixing roller 2 to bring it into contact therewith.
【０００３】[0003]
【発明が解決しようとする課題】ところが、ヒ−タ１の
両端をバネ３で定着ロ−ラ２の内面に押し当てているた
め、ヒ−タ１の両端が定着ロ−ラ２の両端に強く押し当
てられて接触し、ヒ−タ１が定着ロ−ラ２の両端で削ら
れて破損し、定着器の寿命が短くなるという問題点があ
った。However, since both ends of the heater 1 are pressed against the inner surface of the fixing roller 2 by the springs 3, the both ends of the heater 1 come to both ends of the fixing roller 2. There is a problem in that the heater 1 is strongly pressed and brought into contact with the heater 1, and the heater 1 is scraped and damaged at both ends of the fixing roller 2 to shorten the life of the fixing device.
【０００４】そこで、この発明の目的は、電子写真装置
の定着器における定着ロ−ラが削られて破損することを
防止して定着器を長寿命化することにある。SUMMARY OF THE INVENTION Therefore, an object of the present invention is to prevent the fixing roller in the fixing device of an electrophotographic apparatus from being scraped and damaged and to extend the life of the fixing device.
【０００５】[0005]
【課題を解決するための手段】そのため、請求項１に記
載のこの発明は、例えば以下の図示実施例のように、加
圧ロ−ラ３１を円筒形状の定着ロ−ラ３０に押し当て、
その定着ロ−ラ３０内に棒状ヒ−タ３８を通して前記加
圧ロ−ラ３１側の内面に押し当て、その加圧ロ−ラ３１
と前記定着ロ−ラ３０間にシ−ト１６を通してそのシ−
ト１６上の転写画像を定着する電子写真装置の定着器２
１において、前記定着ロ−ラ３０の両端内径を大きくし
てなる、ことを特徴とする。Therefore, according to the present invention described in claim 1, a pressure roller 31 is pressed against a cylindrical fixing roller 30 as shown in the following embodiment, for example.
A rod-shaped heater 38 is passed through the fixing roller 30 and pressed against the inner surface of the pressure roller 31 side, and the pressure roller 31 is pressed.
The sheet 16 is passed between the fixing roller 30 and the fixing roller 30.
Fixing unit 2 of the electrophotographic apparatus for fixing the transferred image on the printer 16.
1, the inner diameter of both ends of the fixing roller 30 is increased.
【０００６】また、請求項２に記載のこの発明は、例え
ば以下の図示実施例のように、請求項１に記載の電子写
真装置の定着器２１において、大きくした前記定着ロ−
ラ３０の両端を薄肉として弾性を保有せしめてなる、こ
とを特徴とする。According to a second aspect of the present invention, for example, as in the following illustrated embodiment, in the fixing device 21 of the electrophotographic apparatus according to the first aspect, the enlarged fixing roller is used.
It is characterized in that both ends of the la 30 are made thin to retain elasticity.
【０００７】また、請求項３に記載のこの発明は、例え
ば以下の図示実施例のように、請求項１に記載の電子写
真装置の定着器２１において、前記棒状ヒ−タ３８の外
周面の全部又は一部に円筒面３８ａを設け、その円筒面
３８ａを前記定着ロ−ラ３０の内面に押し当ててなる、
ことを特徴とする。According to a third aspect of the present invention, in the fixing device 21 of the electrophotographic apparatus according to the first aspect, for example, as shown in the following illustrated embodiment, the outer peripheral surface of the rod-shaped heater 38 is A cylindrical surface 38a is provided on all or part of the surface, and the cylindrical surface 38a is pressed against the inner surface of the fixing roller 30.
It is characterized by
【０００８】[0008]
【作用】そして、請求項１に記載の発明では、定着ロ−
ラ３０の両端が棒状ヒ−タ３８に接触しない。In the invention described in claim 1, the fixing roller is
Both ends of the la 30 do not contact the rod-shaped heater 38.
【０００９】また、請求項２に記載に発明では、軸受に
定着ロ−ラ３０を装着するとき、その拡径部分３０ａを
弾性変形させる。According to the second aspect of the invention, when the fixing roller 30 is mounted on the bearing, the expanded diameter portion 30a of the fixing roller 30 is elastically deformed.
【００１０】また、請求項３に記載の発明では、ヒ−タ
３８の円筒面３８ａが定着ロ−ラ３０に密着する。In the third aspect of the invention, the cylindrical surface 38a of the heater 38 is in close contact with the fixing roller 30.
【００１１】[0011]
【実施例】以下、図面を参照しつつ、この発明の実施例
について説明する。Embodiments of the present invention will be described below with reference to the drawings.
【００１２】図１０は、この発明の定着器を備えるレー
ザプリンタの内部機構の全体概略構成を示す。図中符号
１０で示すものは、プリンタ本体である。プリンタ本体
１０は、略中央にベルト状の感光体１１を備える。感光
体１１は、図中矢示方向に走行し、帯電器１２で表面を
一様に帯電され、レーザ書込み器１３によりその表面に
静電潜像が形成される。この潜像は、現像器１４を通る
ときトナ−を付着して可視像化する。他方、プリンタ本
体１０の図中右側には、給紙カセット１５を着脱自在に
取り付ける。そして、給紙カセット１５内に収納するシ
−ト１６を給紙コロ１７で逐次一枚ずつ送り出し、先端
を一対のレジストローラ１８に突き当てて止める。そし
て、上述した感光体１１上の可視像とタイミングを合わ
せてレジストローラ１８を回転し、シ−ト１６を感光体
１１と転写器１９間へと導く。感光体１１上の可視像
は、転写器１９でシ−ト１６へと転写し、定着器２１に
送ってそこで転写像を定着する。その後、シ−ト１６を
プリンタ本体１０上の排紙部２２へと排出する。一方、
転写後の感光体１１は、除電器２３によって除電後、ク
リーニング器２４で残留トナ−を除去する。FIG. 10 shows an overall schematic structure of an internal mechanism of a laser printer including the fixing device of the present invention. Reference numeral 10 in the drawing denotes the printer body. The printer body 10 includes a belt-shaped photoconductor 11 at substantially the center. The photoconductor 11 travels in the direction of the arrow in the figure, the surface of the photoconductor 11 is uniformly charged by the charger 12, and an electrostatic latent image is formed on the surface by the laser writer 13. When the latent image passes through the developing device 14, a toner is attached to the latent image to form a visible image. On the other hand, the paper feed cassette 15 is detachably attached to the right side of the printer body 10 in the figure. Then, the sheets 16 housed in the paper feed cassette 15 are successively fed one by one by the paper feed roller 17, and the leading ends are abutted against the pair of registration rollers 18 and stopped. Then, the registration roller 18 is rotated at the same timing as the visible image on the photoconductor 11 to guide the sheet 16 between the photoconductor 11 and the transfer unit 19. The visible image on the photoconductor 11 is transferred to the sheet 16 by the transfer device 19 and sent to the fixing device 21 where the transferred image is fixed. After that, the sheet 16 is discharged to the paper discharge unit 22 on the printer body 10. on the other hand,
After the transfer, the photoconductor 11 is destaticized by the destaticizer 23, and the residual toner is removed by the cleaning device 24.
【００１３】上述した定着器２１は、図１及び図２に示
すように、定着ローラ３０と加圧ローラ３１とをそれぞ
れ軸受３２・３３で支持して上下に配置し、加圧ローラ
３１をバネ３４で付勢して円筒状の定着ロ−ラ３０に押
し当てる。定着ロ−ラ３０は、内層にニッケルの電鋳薄
肉管３５を用い、その厚さを適度の剛体であって熱伝導
性が悪くならない厚さの８０〜２００μｍに形成する。
また、この薄肉管３５のまわりには、図示しない接着層
と、その表層に設けた離型層である厚さ８〜３０μｍの
ＰＦＡ、ＴＦＥなどのフッ素樹脂層３６を設ける。ま
た、一端に軸受３２に隣接して駆動用の歯車３７を取り
付ける。そして、定着ロ−ラ３０内に棒状ヒ−タ３８を
通してバネ３９で加圧ロ−ラ３１側の内面に押し当て
る。他方、加圧ローラ３１は、ゴム硬度１０〜３５のシ
リコンゴムローラを用いる。As shown in FIGS. 1 and 2, the above-mentioned fixing device 21 has a fixing roller 30 and a pressure roller 31 which are supported vertically by bearings 32 and 33, respectively. It is urged by 34 and pressed against the cylindrical fixing roller 30. The fixing roller 30 uses an electroformed thin-walled tube 35 of nickel as an inner layer, and is formed to have a thickness of 80 to 200 μm, which is a moderately rigid body and does not deteriorate heat conductivity.
Further, around the thin pipe 35, an adhesive layer (not shown) and a fluororesin layer 36 such as PFA or TFE having a thickness of 8 to 30 μm, which is a release layer provided on the surface layer thereof, are provided. Further, a drive gear 37 is attached to one end adjacent to the bearing 32. Then, the rod-shaped heater 38 is passed through the fixing roller 30 and pressed against the inner surface of the pressure roller 31 side by the spring 39. On the other hand, as the pressure roller 31, a silicon rubber roller having a rubber hardness of 10 to 35 is used.
【００１４】ところで、定着ロ−ラ３０の形状は、図３
に示すように中央の径Ｄ1が最小であって、その中央か
ら両端に向けてテ−パ状に拡がって径Ｄ2となり、更に
急激に拡がる拡径Ｄ3とした円筒状とする。そして、定
着ロ−ラ３０の長さが約３００ｍｍ、径Ｄ1が１８〜２
５ｍｍのときＤ2は、それよりも最大０．１５ｍｍ大き
く、Ｄ3はＤ1を基準としてそれより少なくとも０．４ｍ
ｍ以上大となるようにする。両端の拡径部分３０ａは、
押し広げて拡径とすることにより図４に示すように、そ
の肉厚ｔを３０〜１２０μｍの薄肉とし、弾性を保有さ
せて容易に変形可能に形成する。By the way, the shape of the fixing roller 30 is shown in FIG.
Diameter D 1 of the center a minimum as shown in, the center toward both ends from the tape - and the diameter D 2 becomes spread to path shape, further enlarged diameter D 3 and a cylindrical shape extending rapidly. The fixing roller 30 has a length of about 300 mm and a diameter D 1 of 18 to 2
At 5 mm, D 2 is larger than that by 0.15 mm at the maximum, and D 3 is at least 0.4 m from D 1 with reference to it.
Make it larger than m. The expanded diameter portions 30a at both ends are
As shown in FIG. 4, the thickness t is reduced to 30 to 120 μm by expanding and expanding the diameter to retain elasticity and to be easily deformable.
【００１５】一方、棒状ヒ−タ３８は、外周面の全部に
円筒面３８ａを有する例えば図５に示すような円柱状
の、又は外周面の一部に円筒面３８ａを有する例えば図
６に示すような断面半円形のセラミックヒ−タとし、そ
の円筒面３８ａを定着ロ−ラ３０における加圧ロ−ラ３
１側の内面に押し当てる。この場合、棒状ヒ−タ３８が
図５に示すような円柱状のものである場合には、これを
回転させてもよい。また、上記のセラミックヒ−タは、
セラミックに抵抗体を混ぜて抵抗発熱体としたものであ
るが、図７及び図８に示すように絶縁体であるセラミッ
ク４０に面状の発熱体４１を接着し、その発熱体４１側
の面を定着ロ−ラ３１の内面に押し当てるようにしても
よい。On the other hand, the rod-shaped heater 38 has a cylindrical surface 38a on the entire outer peripheral surface, for example, a cylindrical shape as shown in FIG. 5, or has a cylindrical surface 38a on a part of the outer peripheral surface, for example, shown in FIG. Such a ceramic heater having a semicircular cross section is used, and the cylindrical surface 38a thereof is applied to the pressure roller 3 of the fixing roller 30.
Press on the inner surface of side 1. In this case, if the rod-shaped heater 38 has a columnar shape as shown in FIG. 5, it may be rotated. Also, the above ceramic heater is
A resistance heating element is prepared by mixing ceramics with a resistor. As shown in FIGS. 7 and 8, a planar heating element 41 is adhered to the ceramic 40 which is an insulator, and the surface on the heating element 41 side is bonded. May be pressed against the inner surface of the fixing roller 31.
【００１６】そして、図９に示すように、定着ロ−ラ３
０の両端の拡径部分３０ａを弾性変形させてそれより内
側で軸受３２に装着する。また、定着ロ−ラ３０から突
出させた棒状ヒ−タ３８の両端には、電極４２を設け
る。そして、電極４２に通電して棒状ヒ−タ３８を発熱
させるとともに定着ロ−ラ３０及び加圧ロ−ラ３１を回
転する。Then, as shown in FIG. 9, the fixing roller 3
The expanded diameter portions 30a at both ends of 0 are elastically deformed and mounted inside the bearing 32. Further, electrodes 42 are provided at both ends of the rod-shaped heater 38 protruding from the fixing roller 30. Then, the electrode 42 is energized to heat the rod-shaped heater 38, and the fixing roller 30 and the pressure roller 31 are rotated.
【００１７】[0017]
【発明の効果】従って、請求項１に記載の発明によれ
ば、定着ロ−ラの両端内径を大きくしたので、棒状ヒ−
タを定着ロ−ラ内に通して加圧ロ−ラ側の内面に押し当
てても定着ロ−ラの両端が棒状ヒ−タの両端に接触する
ことが防止され、ヒ−タが定着ロ−ラの両端によって削
られることがない。そのため、定着器を長寿命とするこ
とができる。Therefore, according to the first aspect of the present invention, since the inner diameter of both ends of the fixing roller is increased, the rod-shaped heat roller is formed.
Even if the fixing roller is passed through the fixing roller and pressed against the inner surface on the pressure roller side, both ends of the fixing roller are prevented from contacting both ends of the rod-shaped heater, and the heater is fixed. -It is not scraped by both ends of the la. Therefore, the fixing device can have a long life.
【００１８】また、請求項２に記載の発明によれば、定
着ロ−ラの両端を薄肉として弾性を保有せしめたので、
軸受などへの装着などのとき、拡径部分を弾性変形させ
て容易に装着できる。According to the second aspect of the present invention, both ends of the fixing roller are made thin so as to retain elasticity.
When installing to bearings, etc., the expanded diameter part can be elastically deformed and easily installed.
【００１９】また、請求項３に記載の発明によれば、棒
状ヒ−タの円筒面を定着ロ−ラの内面に押し当てるの
で、弱い加圧力でも定着ロ−ラと密着させることができ
る。そのため、ヒ−タに強い力が作用しないので、ヒ−
タの破損などがなくなり定着器を長寿命とすることがで
きる。According to the third aspect of the invention, since the cylindrical surface of the rod-shaped heater is pressed against the inner surface of the fixing roller, it can be brought into close contact with the fixing roller even with a weak pressing force. Therefore, since a strong force does not act on the heater,
The fixing device can have a long service life without damage to the fixing device.
【図１】この発明の一実施例であるレ−ザプリンタの定
着器の要部正面図である。FIG. 1 is a front view of a main part of a fixing device of a laser printer according to an embodiment of the present invention.
【図２】その定着器の要部断面図である。FIG. 2 is a sectional view of a main part of the fixing device.
【図３】その定着ロ−ラの正面図である。FIG. 3 is a front view of the fixing roller.
【図４】その端部の一部を示す拡大断面図である。FIG. 4 is an enlarged cross-sectional view showing a part of the end portion.
【図５】その定着ロ−ラの内面に押し当てる棒状ヒ−タ
の斜視図である。FIG. 5 is a perspective view of a rod-shaped heater pressed against the inner surface of the fixing roller.
【図６】その他例を示す棒状ヒ−タの斜視図である。FIG. 6 is a perspective view of a rod-shaped heater showing another example.
【図７】その更に他例を示す棒状ヒ−タの斜視図であ
る。FIG. 7 is a perspective view of a rod-shaped heater showing still another example thereof.
【図８】その側面図である。FIG. 8 is a side view thereof.
【図９】棒状ヒ−タを装着した定着ロ−ラの端部付近の
拡大正面図である。FIG. 9 is an enlarged front view of the vicinity of an end portion of a fixing roller equipped with a rod-shaped heater.
【図１０】その定着器を備えるレ−ザプリンタの内部概
略構成図である。FIG. 10 is an internal schematic configuration diagram of a laser printer including the fixing device.
【図１１】従来の定着器におけるヒ−タを装着した定着
ロ−ラの端部を示す部分斜視図である。FIG. 11 is a partial perspective view showing an end portion of a fixing roller equipped with a heater in a conventional fixing device.
１６ シ−ト ２１ 定着器 ３０ 定着ロ−ラ ３０ａ 拡径部分 ３１ 加圧ロ−ラ ３８ 棒状ヒ−タ ３８ａ 円筒面 16 sheet 21 fixing device 30 fixing roller 30a expanded diameter portion 31 pressure roller 38 rod-shaped heater 38a cylindrical surface
Claims (3)
し当て、その定着ロ−ラ内に棒状ヒ−タを通して前記加
圧ロ−ラ側の内面に押し当て、その加圧ロ−ラと前記定
着ロ−ラ間にシ−トを通してそのシ−ト上の転写画像を
定着する電子写真装置の定着器において、前記定着ロ−
ラの両端内径を大きくしてなる、電子写真装置の定着
器。1. A pressure roller is pressed against a cylindrical fixing roller, a rod-shaped heater is passed through the fixing roller, and pressed against the inner surface of the pressure roller, and the pressure is applied. In a fixing device of an electrophotographic apparatus for fixing a transferred image on the sheet by passing a sheet between the roller and the fixing roller, the fixing roller
A fixing device for an electrophotographic device, which has a large inner diameter at both ends of the roller.
として弾性を保有せしめてなる、請求項１に記載の電子
写真装置の定着器。2. The fixing device for an electrophotographic apparatus according to claim 1, wherein both ends of the enlarged fixing roller are made thin to retain elasticity.
ラの内面に押し当ててなる、請求項１に記載の電子写真
装置の定着器。3. The fixing roller is attached to the cylindrical surface of the rod-shaped heater.
The fixing device for an electrophotographic apparatus according to claim 1, which is pressed against the inner surface of the la.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP25957691A JPH0572933A (en) | 1991-09-11 | 1991-09-11 | Fixing device for electrophotographic copying device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP25957691A JPH0572933A (en) | 1991-09-11 | 1991-09-11 | Fixing device for electrophotographic copying device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0572933A true JPH0572933A (en) | 1993-03-26 |
Family
ID=17336043
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP25957691A Pending JPH0572933A (en) | 1991-09-11 | 1991-09-11 | Fixing device for electrophotographic copying device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0572933A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0869194A (en) * | 1994-08-29 | 1996-03-12 | Nec Corp | Heat roll fixing device |
| JP2002207388A (en) * | 2001-01-12 | 2002-07-26 | Ricoh Co Ltd | Image forming device |
-
1991
- 1991-09-11 JP JP25957691A patent/JPH0572933A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0869194A (en) * | 1994-08-29 | 1996-03-12 | Nec Corp | Heat roll fixing device |
| JP2002207388A (en) * | 2001-01-12 | 2002-07-26 | Ricoh Co Ltd | Image forming device |
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