JPH08314318A - Thermal roller fixing unit - Google Patents
Thermal roller fixing unitInfo
- Publication number
- JPH08314318A JPH08314318A JP12104795A JP12104795A JPH08314318A JP H08314318 A JPH08314318 A JP H08314318A JP 12104795 A JP12104795 A JP 12104795A JP 12104795 A JP12104795 A JP 12104795A JP H08314318 A JPH08314318 A JP H08314318A
- Authority
- JP
- Japan
- Prior art keywords
- roller
- claw
- paper
- separating
- roller surface
- 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.)
- Withdrawn
Links
Landscapes
- Fixing For Electrophotography (AREA)
- Separation, Sorting, Adjustment, Or Bending Of Sheets To Be Conveyed (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は電子写真プリンタ等の熱
ロ−ラ定着器に備えられた用紙分離爪に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sheet separating claw provided in a heat roller fixing device such as an electrophotographic printer.
【０００２】[0002]
【従来の技術】従来、電子写真プリンタ等の熱ロ−ラ定
着器には、ヒ−トロ−ラのロ−ラ面に爪部を接触させた
用紙分離爪を有し、ヒ−トロ−ラとバックアップロ−ラ
との圧接部で未定着トナ−画像を印刷用紙の紙面に加熱
圧着し、ヒ−トロ−ラ面に付着した印刷用紙を用紙分離
爪でヒ−トロ−ラ面から分離させるものがある。2. Description of the Related Art Conventionally, a heat roller fixing device such as an electrophotographic printer has a paper separating claw whose claw portion is in contact with a roller surface of a heat roller. The unfixed toner image is heated and pressure-bonded to the paper surface of the printing paper at the pressure contact portion between the backup roller and the backup roller, and the printing paper adhered to the heat roller surface is separated from the heat roller surface by the paper separating claw. There is something.
【０００３】[0003]
【発明が解決しようとする課題】従来の熱ロ−ラ定着器
にあっては、印刷用紙をヒ−トロ−ラ面から分離させる
分離爪がスクレ−パとなって、ロ−ラ面に付着した溶融
した微小なオフセットトナ−（以後トナ−と記す）を分
離爪の爪部とヒ−トロ−ラ面との当接部に溜める。分離
爪の爪部とヒ−トロ−ラ面との当接部に溜まった溶融し
たトナ−はトナ−量が少ない内は表面張力により分離爪
の爪部に溜まっているが、トナ−量が多くなって、ヒ−
トロ−ラ面との接触面積が増大してくると、トナ−とヒ
−トロ−ラ面との間に作用する摩擦力がトナ−の表面張
力に勝り、溶融したトナ−がヒ−トロ−ラ面に付着して
印刷用紙を汚したり、あるいはバックアップロ−ラの表
面に付着して印刷用紙を汚したりするという問題点があ
った。In the conventional heat roller fixing device, the separating claws for separating the printing paper from the heater surface serve as scrapers and adhere to the roller surface. The melted minute offset toner (hereinafter referred to as a toner) is stored in the contact portion between the claw portion of the separating claw and the heater roller surface. The molten toner accumulated in the contact portion between the claw portion of the separating claw and the heater roller has a small amount of toner, but inside the claw portion of the separating claw due to surface tension, the amount of toner is small. Increasing
When the contact area with the roller surface is increased, the frictional force acting between the toner and the roller surface exceeds the surface tension of the toner, and the molten toner is heated. There is a problem that it adheres to the surface of the backup roller to stain the printing paper, or adheres to the surface of the backup roller to stain the printing paper.
【０００４】本発明は、微小なオフセットトナ−が用紙
分離爪とヒ−トロ−ラ面との当接部に溜まらないように
して、印刷用紙がオフセットトナ−により汚されること
から防止する熱ロ−ラ定着器を提供することを目的とし
ている。According to the present invention, a minute offset toner is prevented from accumulating at the contact portion between the sheet separating claw and the heater roller to prevent the printing sheet from being soiled by the offset toner. -The purpose is to provide a fixing device.
【０００５】[0005]
【課題を解決するための手段】上記目的を達成するため
に本発明の熱ロ−ラ定着器においては、用紙分離爪はヒ
−トロ−ラのロ−ラ面との接触幅を１ｍｍ未満にしてヒ
−トロ−ラのロ−ラ面に付着した微小なオフセットトナ
−が用紙分離爪よりもヒ−トロ−ラのロ−ラ面に帰属す
るようにしたものである。In order to achieve the above object, in the heat roller fixing device of the present invention, the paper separating claw has a contact width with the roller surface of the heater roller of less than 1 mm. The minute offset toner attached to the roller surface of the heat roller is attributed to the roller surface of the heat roller rather than the sheet separating claw.
【０００６】[0006]
【作用】上記のように構成された熱ロ−ラ定着器のヒ−
トロ−ラを回転すると、ヒ−トロ−ラ面に付着した溶融
した微小なオフセットトナ−は用紙分離爪の爪部に接触
するが、１ｍｍ未満の接触幅を有するので用紙分離爪よ
りもヒ−トロ−ラのロ−ラ面に帰属したまま回転し、分
離爪の爪部とヒ−トロ−ラ面との当接部に溜まらないよ
うに働く。The function of the heat roller fixing device constructed as described above is as follows.
When the roller is rotated, the melted minute offset toner attached to the surface of the roller contacts the claw portion of the sheet separating claw, but since it has a contact width of less than 1 mm, it is higher than the sheet separating claw. The roller rotates while belonging to the roller surface of the roller, and works so as not to collect in the contact portion between the claw portion of the separating claw and the roller surface.
【０００７】従って本発明よれば、微小なオフセットト
ナ−が用紙分離爪とヒ−トロ−ラ面との当接部で大きな
固まりにならないので、印刷用紙がオフセットトナ−に
より汚されることから防止できるのである。Therefore, according to the present invention, since the minute offset toner does not become a large mass at the contact portion between the sheet separating claw and the heater roller, the printing sheet can be prevented from being soiled by the offset toner. Of.
【０００８】[0008]
【実施例】本発明の実施例について図面を参照しながら
説明する。尚、各図面に共通な要素には同一符号を付
す。Embodiments of the present invention will be described with reference to the drawings. Elements common to the drawings are given the same reference numerals.
【０００９】図１は熱ロ−ラ定着器の概略構成を示す側
面図であり、図２は実施例の分離爪を示す部分拡大図で
ある。熱ロ−ラ定着器１はヒ−トロ−ラ２のロ−ラ面に
爪部を接触させた用紙分離爪３（以後分離爪３と記す）
を有し、加熱されたヒ−トロ−ラ２とバックアップロ−
ラ４との圧接部で未定着トナ−画像を印刷用紙５の紙面
に加熱圧着し、ヒ−トロ−ラ２のロ−ラ面に付着した印
刷用紙５を用紙分離爪３でヒ−トロ−ラ２のロ−ラ面か
ら分離させる。FIG. 1 is a side view showing a schematic structure of a heat roller fixing device, and FIG. 2 is a partially enlarged view showing a separating claw of an embodiment. The heat roller fixing device 1 has a sheet separating claw 3 (hereinafter referred to as a separating claw 3) in which a claw portion is in contact with a roller surface of a heat roller 2.
Having a heated heater 2 and a backup roller
The unfixed toner image is heated and pressure-bonded to the surface of the printing paper 5 at the pressure contact portion with the roller 4, and the printing paper 5 attached to the roller surface of the heater 2 is hit-troused by the paper separating claw 3. Separate from the roller surface of La2.
【００１０】ヒ−トロ−ラ２はアルミニウムやステンレ
ス等の金属パイプからなり、未定着トナ−画像に触れる
ので印刷用紙５の表面トナ−に対して十分な剥離性を有
するようにロ−ラ表面にフッソ樹脂、あるいはシリコン
ゴム等の非粘着性を有する物質が被覆加工されている。
ヒ−トロ−ラ２の内部には図示せぬハロゲンランプ等の
熱源が設けてある。また、バックアップロ−ラ４は硬度
の低いシリコンゴム等で構成されている。The heat roller 2 is made of a metal pipe such as aluminum or stainless steel, and touches the unfixed toner image, so that the roller surface has a sufficient peeling property with respect to the surface toner of the printing paper 5. The non-adhesive substance such as fluorine resin or silicon rubber is coated on the surface.
Inside the heater 2, a heat source such as a halogen lamp (not shown) is provided. The backup roller 4 is made of silicon rubber having a low hardness.
【００１１】また、分離爪３は印刷できる許容用紙サイ
ズに応じてヒ−トロ−ラ２の軸方向に複数個配設され、
定着器カバ−６に回動自在に保持されて後端部を圧縮コ
イルスプリング７等に付勢され、爪部８をヒ−トロ−ラ
２の周面に適度な押圧力で当接させている。このため、
分離爪３は機械的強度（高温で変形しにくい）や耐熱性
に優れた液晶ポリマ−、ポリイミドなどのプラスチック
が基材として使用され、爪部８、あるいは全面にヒ−ト
ロ−ラ２のロ−ラ面と同様非粘着性でヒ−トロ−ラ２の
ロ−ラ面を傷付けにくいフッソ樹脂などが被覆加工され
ている。A plurality of separating claws 3 are arranged in the axial direction of the heater 2 in accordance with the size of printable paper.
It is rotatably held by the fixing device cover 6 and its rear end portion is biased by the compression coil spring 7 and the like, and the claw portion 8 is brought into contact with the peripheral surface of the heater roller 2 with an appropriate pressing force. There is. For this reason,
The separation claw 3 is made of a plastic such as liquid crystal polymer or polyimide having excellent mechanical strength (hard to be deformed at high temperature) and heat resistance as a base material, and the claw 8 or the entire surface of the roller 2 is covered with the plastic. Like the roller surface, it is non-adhesive, and the roller surface of the heat roller 2 is coated with a fluorine resin or the like that is hard to scratch.
【００１２】ここで、分離爪３の爪部８とヒ−トロ−ラ
２のロ−ラ面との接触幅Ｄがトナ−付着にどのように影
響するか実験した結果を下表に示す。（トナ−粒子の大
きさは７μ〜９．５μである） 接触幅Ｄが１ｍｍ未満の場合には、爪部８の中央部のト
ナ−同志の結合力よりヒ−トロ−ラ２のロ−ラ面への帰
属力が強く、爪部８にわずかに付着するが、印刷用紙５
を汚す程溜まらない。接触幅Ｄが１ｍｍ以上の場合に
は、爪部８の中央部のトナ−同志の結合力がヒ−トロ−
ラ２のロ−ラ面への帰属力より強く、爪部８に付着して
いき、溶融したトナ−とヒ−トロ−ラ２のロ−ラ面との
間に作用する摩擦力が溶融したトナ−の表面張力に勝る
と、一挙にヒ−トロ−ラ２のロ−ラ面に付着していくこ
とが判る。The following table shows the results of experiments on how the contact width D between the claw portion 8 of the separation claw 3 and the roller surface of the heat roller 2 affects toner adhesion. (The size of the toner particles is 7 μ to 9.5 μ) When the contact width D is less than 1 mm, the force of belonging to the roller surface of the heat roller 2 is stronger than the joining force of the toners in the central portion of the claw portion 8 and slightly adheres to the claw portion 8. Print paper 5
It doesn't collect enough to stain. When the contact width D is 1 mm or more, the connecting force between the toners in the central portion of the claw portion 8 is the same as the heat-troth.
The frictional force acting between the melted toner and the roller surface of the heat roller 2 was melted and adhered to the claw portion 8 stronger than the attribution force of the roller 2 to the roller surface. It can be seen that when the surface tension of the toner is exceeded, the toner adheres to the roller surface of the heater 2 at once.
【００１３】本実施例の分離爪３には、図２に示すよう
に、ヒ−トロ−ラ２のロ−ラ面に接触する爪部８ａ、８
ｂを爪部間に所定の距離Ｃを設けて２箇所有している。
爪部８ａ、８ｂの接触幅Ｄは１ｍｍ未満である。As shown in FIG. 2, the separation claw 3 of this embodiment has claw portions 8a, 8a which come into contact with the roller surface of the heat roller 2.
Two b are provided at a predetermined distance C between the claw portions.
The contact width D of the claw portions 8a and 8b is less than 1 mm.
【００１４】つぎに動作について説明する。加熱された
ヒ−トロ−ラ２とバックアップロ−ラ４とはそれぞれ矢
印Ａ、Ｂ方向に回転し、圧接部で未定着トナ−画像を印
刷用紙５の紙面に加熱圧着する。非粘着性の物質で被覆
加工されたヒ−トロ−ラ２のロ−ラ面には、定着時、溶
融した微小なオフセットトナ−（以後トナ−と記す）が
付着し、印刷用紙５に定着されるが目立たない程度微小
である。そのような、微小なトナ−が分離爪３の爪部８
ａ、８ｂに接触するが、狭い接触幅Ｄを有するので分離
爪３よりもヒ−トロ−ラ２のロ−ラ面に帰属したまま回
転し、分離爪３の爪部８ａ、８ｂとヒ−トロ−ラ２のロ
−ラ面との当接部に溜まらないように働く。Next, the operation will be described. The heated heater 2 and backup roller 4 rotate in the directions of arrows A and B, respectively, and the unfixed toner image is heated and pressure-bonded to the paper surface of the printing paper 5 at the pressure contact portion. On the roller surface of the heat roller 2 coated with a non-adhesive substance, a minute offset toner (hereinafter referred to as a toner) melted at the time of fixing is attached and fixed on the printing paper 5. It is so small that it is not noticeable. Such a small toner is the claw portion 8 of the separation claw 3.
Although it comes into contact with a and 8b, since it has a narrow contact width D, it rotates while belonging to the roller surface of the heat roller 2 rather than the separating claw 3, and the claw portions 8a and 8b of the separating claw 3 and the heel. It works so as not to collect in the contact portion of the roller 2 with the roller surface.
【００１５】従って、微小なオフセットトナ−が用紙分
離爪とヒ−トロ−ラ面との当接部で大きな固まりになら
ないので、印刷用紙がオフセットトナ−により汚される
ことから防止できるのである。Therefore, since the minute offset toner does not become a large mass at the contact portion between the sheet separating claw and the heater roller surface, it is possible to prevent the printing sheet from being soiled by the offset toner.
【００１６】本発明に係る分離爪３の接触幅Ｄは１ｍｍ
未満とし、本実施例の分離爪３の爪部８にはヒ−トロ−
ラ２のロ−ラ面に接触する面を２箇所設けた（３箇所以
上にするとヒ−トロ−ラ２のロ−ラ面から浮いた爪部８
が存在して、その先端部に印字用紙が引掛かり用紙ジャ
ムの原因となる）が、図３に示すように、１ｍｍ未満の
接触幅を有して接触する面を１箇所としてもよいし、図
４に示すように、１ｍｍ未満の接触幅Ｄを有する個別の
分離爪１０ａ、１０ｂを爪部間に所定の距離Ｃを設けて
２個隣接させた分離爪１０としてもよいし、図５に示す
ように、個別の分離爪１１ａ、１１ｂ、１１ｃを複数隣
接させた分離爪１１としてもよい。個別の分離爪を複数
隣接させたことにより、ヒ−トロ−ラのロ−ラ面から浮
いた爪部が存在しなくなり、用紙ジャムを防止できる。The contact width D of the separating claw 3 according to the present invention is 1 mm.
Less than, and the claw portion 8 of the separation claw 3 of this embodiment has a heat-trouser.
Two surfaces are provided in contact with the roller surface of the roller 2 (when the number of the surfaces is three or more, the claw portion 8 floated from the roller surface of the heater 2).
Exist, and the print paper is caught at the leading end of the paper and causes a paper jam). However, as shown in FIG. 3, there may be one contact surface having a contact width of less than 1 mm, As shown in FIG. 4, the individual separating claws 10a and 10b having a contact width D of less than 1 mm may be two separating claws 10 adjacent to each other with a predetermined distance C provided between the claw portions. As shown, a plurality of individual separating claws 11a, 11b, 11c may be adjacent to each other to form the separating claw 11. By arranging a plurality of individual separating claws adjacent to each other, the claw portion floating from the roller surface of the heat roller does not exist, and the paper jam can be prevented.
【００１７】[0017]
【発明の効果】本発明は、以上説明したように構成され
ているので以下に記載される効果を奏する。Since the present invention is configured as described above, it has the following effects.
【００１８】用紙分離爪とヒ−トロ−ラのロ−ラ面との
接触幅を１ｍｍ未満にしたことにより、ロ−ラ面上の微
小なオフセットトナ−が用紙分離爪により大きな固まり
とはならないので、印刷用紙がオフセットトナ−により
汚されない。Since the contact width between the sheet separating claw and the roller surface of the heat roller is set to less than 1 mm, the minute offset toner on the roller surface does not become a large mass due to the sheet separating claw. Therefore, the printing paper is not stained by the offset toner.
【図１】熱ロ−ラ定着器の概略構成を示す側面図であ
る。FIG. 1 is a side view showing a schematic configuration of a heat roller fixing device.
【図２】実施例の分離爪を示す部分拡大図である。FIG. 2 is a partially enlarged view showing the separation claw of the embodiment.
【図３】変形例の分離爪を示す部分拡大図（１）であ
る。FIG. 3 is a partially enlarged view (1) showing a separation claw of a modified example.
【図４】変形例の分離爪を示す部分拡大図（２）であ
る。FIG. 4 is a partially enlarged view (2) showing a separation claw of a modified example.
【図５】変形例の分離爪を示す部分拡大図（３）であ
る。FIG. 5 is a partially enlarged view (3) showing a separation claw of a modified example.
１ 熱ロ−ラ定着器 ２ ヒ−トロ−ラ ３、９、１０、１１ 用紙分離爪 ４ バックアップロ−ラ ８ 爪部 1 Heat Roller Fixing Device 2 Heat Roller 3, 9, 10, 11 Paper Separation Claw 4 Backup Roller 8 Claw
Claims (3)
せた用紙分離爪を有し、ヒ−トロ−ラとバックアップロ
−ラとの圧接部で未定着トナ−画像を印刷用紙の紙面に
加熱圧着し、ヒ−トロ−ラ面に付着した印刷用紙を用紙
分離爪でヒ−トロ−ラ面から分離させる熱ロ−ラ定着器
において、 上記用紙分離爪はヒ−トロ−ラのロ−ラ面との接触幅を
１ｍｍ未満にしてヒ−トロ−ラのロ−ラ面に付着した微
小なオフセットトナ−が用紙分離爪よりもヒ−トロ−ラ
のロ−ラ面に帰属するようにしたことを特徴とする熱ロ
−ラ定着器。1. An unfixed toner image is formed at a pressure contact portion between a roller and a backup roller, which has a sheet separating claw having a claw portion in contact with a roller surface of the roller roller. In a heat roller fixing device in which the printing paper adhered to the heat roller surface is heated and pressure-bonded to the surface of the printing paper and is separated from the heater roller surface by the paper separating claw, the paper separating claw is a heat roller. -By setting the contact width of the roller to the roller surface to be less than 1 mm, the minute offset toner attached to the roller surface of the heater roller surface of the roller roller rather than the sheet separating claw. A heat roller fixing device characterized in that it is made to belong to.
つの爪部を爪部間に所定の距離を設けて一体に形成した
請求項１記載の熱ロ−ラ定着器。2. The paper separating pawl has the contact width of 2.
2. The heat roller fixing device according to claim 1, wherein the two claw portions are integrally formed with a predetermined distance provided between the claw portions.
部を設けた個別の分離爪を爪部間に所定の距離を設けて
複数隣接させた請求項１記載の熱ロ−ラ定着器。3. The heat roller fixing device according to claim 1, wherein the paper separating claws have a plurality of individual separating claws provided with claw portions having the contact width and are adjacent to each other with a predetermined distance between the claw portions. .
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12104795A JPH08314318A (en) | 1995-05-19 | 1995-05-19 | Thermal roller fixing unit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12104795A JPH08314318A (en) | 1995-05-19 | 1995-05-19 | Thermal roller fixing unit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH08314318A true JPH08314318A (en) | 1996-11-29 |
Family
ID=14801516
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP12104795A Withdrawn JPH08314318A (en) | 1995-05-19 | 1995-05-19 | Thermal roller fixing unit |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH08314318A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7003252B2 (en) | 2003-02-10 | 2006-02-21 | Brother Kogyo Kabushiki Kaisha | Thermal fixing device and image forming apparatus |
| JP2015025981A (en) * | 2013-07-29 | 2015-02-05 | 京セラドキュメントソリューションズ株式会社 | Fixing device and image forming apparatus |
-
1995
- 1995-05-19 JP JP12104795A patent/JPH08314318A/en not_active Withdrawn
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7003252B2 (en) | 2003-02-10 | 2006-02-21 | Brother Kogyo Kabushiki Kaisha | Thermal fixing device and image forming apparatus |
| JP2015025981A (en) * | 2013-07-29 | 2015-02-05 | 京セラドキュメントソリューションズ株式会社 | Fixing device and image forming apparatus |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A300 | Withdrawal of application because of no request for examination |
Free format text: JAPANESE INTERMEDIATE CODE: A300 Effective date: 20020806 |