JPS629906B2 - - Google Patents
Info
- Publication number
- JPS629906B2 JPS629906B2 JP54064962A JP6496279A JPS629906B2 JP S629906 B2 JPS629906 B2 JP S629906B2 JP 54064962 A JP54064962 A JP 54064962A JP 6496279 A JP6496279 A JP 6496279A JP S629906 B2 JPS629906 B2 JP S629906B2
- Authority
- JP
- Japan
- Prior art keywords
- roller
- roller surface
- separating
- temperature
- contact
- 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
Links
- 238000000926 separation method Methods 0.000 claims description 20
- 210000000078 claw Anatomy 0.000 claims description 18
- 238000010438 heat treatment Methods 0.000 claims description 10
- 238000001514 detection method Methods 0.000 claims description 2
- 238000004140 cleaning Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 239000004809 Teflon Substances 0.000 description 1
- 229920006362 Teflon® Polymers 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- 230000003578 releasing effect Effects 0.000 description 1
- 238000007790 scraping Methods 0.000 description 1
Landscapes
- Fixing For Electrophotography (AREA)
Description
【発明の詳細な説明】
本発明は、トナー像支持体をローラから分離す
る分離手段を具備する加熱ローラ定着装置に関す
る。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a heated roller fixing device that includes separating means for separating a toner image support from a roller.
この形式の加熱ローラ定着装置では、分離を確
実にするため接触型の分離手段、例えば分離爪を
用いるのが普通であり、その場合分離爪にトナー
の付着するのが避けられない。複写工程の終了後
機械の電源を切ると、機械が停止して加熱ローラ
等が冷え、トナーがローラと分離爪との間で固ま
り、一種の接着剤として作用する。従つて、次に
機械を動かすとき起動トルクが増大する結果とな
つた。これに対し、機械を始動し加熱ローラを加
熱し始めた加熱初期段階では、加熱ローラを停止
させたまゝとし、加熱ローラ表面温度が所定温度
に達して機械が立ち上がり複写サイクルが開始さ
れると、初めてローラが回転するようにしたもの
は既に提案されている。この場合、ローラは充分
に加熱されているので、ローラと分離爪との間に
あるトナーは溶け、その大部分は分離爪に残る
が、ローラ表面にも少量ではあるが付着する。複
写サイクルは既に開始されていてクリーニング時
間が短いので、コピーが定着ローラ対に来るまで
にローラ表面のトナーをクリーニングしきれず、
このトナーがコピーに付着して画像品質を劣化さ
せる結果となつている。 In this type of heating roller fixing device, contact-type separation means, such as separation claws, are usually used to ensure separation, and in this case, it is inevitable that toner adheres to the separation claws. When the power to the machine is turned off after the copying process is completed, the machine stops and the heating rollers etc. cool down, and the toner hardens between the roller and the separation claw, acting as a type of adhesive. Therefore, the starting torque increases the next time the machine is started. On the other hand, in the initial stage of heating when the machine is started and the heating roller begins to heat up, the heating roller remains stopped, and when the heating roller surface temperature reaches a predetermined temperature and the machine starts up and the copying cycle begins, A device in which the roller rotates for the first time has already been proposed. In this case, since the roller is sufficiently heated, the toner between the roller and the separation claw melts, and most of it remains on the separation claw, but a small amount also adheres to the roller surface. Since the copying cycle has already started and the cleaning time is short, the toner on the roller surface cannot be cleaned completely by the time the copy reaches the fuser roller pair.
This toner adheres to the copy, resulting in deterioration of image quality.
複写サイクルの通紙時のみ分離手段をローラに
接触させることも、既に提案されている。しかし
この場合、分離手段をローラに圧接することは技
術的に難しく、更にローラに圧接する頻度が多く
ローラ表面を傷つけ易い欠点がある。 It has already been proposed to bring the separating means into contact with the roller only during paper passing during the copying cycle. However, in this case, it is technically difficult to bring the separation means into pressure contact with the roller, and furthermore, there is a disadvantage that the separation means is brought into pressure contact with the roller frequently and the roller surface is easily damaged.
本発明は、従来の加熱ローラ定着装置における
上述の欠点を除去することを目的とする。以下に
添附の図面について、本発明の実施例を説明す
る。 The present invention aims to eliminate the above-mentioned drawbacks in conventional heated roller fixing devices. Embodiments of the present invention will be described below with reference to the accompanying drawings.
第１図に於て、定着ローラ１と加圧ローラ２と
は、それぞれヒータ１ａおよび２ａを内蔵して互
いに圧接して矢印方向に回動する。両ローラの接
合部の前後に案内板３および４が配置されてい
る。５は、トナー像を支持せるシートである。定
着ローラ１には、クリーニングローラ６および分
離爪７が配置されており、クリーニングローラに
はトナー掻落し用ブレード８およびかく掻落した
トナーの受箱９が付設されている。シート５の搬
出側には、排紙ローラ対１０が設けられている。 In FIG. 1, a fixing roller 1 and a pressure roller 2 each have built-in heaters 1a and 2a, are pressed against each other, and rotate in the direction of the arrow. Guide plates 3 and 4 are arranged before and after the joint between both rollers. 5 is a sheet that can support a toner image. A cleaning roller 6 and a separating claw 7 are arranged on the fixing roller 1, and a toner scraping blade 8 and a receiving box 9 for the scraped toner are attached to the cleaning roller. A pair of paper discharge rollers 10 is provided on the conveyance side of the sheet 5 .
第２図に於て、分離爪７は支軸１１により回動
自在に取付けられ、更に分離爪の後端に設けたピ
ン１２に引張ばね１３の１端を係止し、その他端
は機枠に固定のピン１４に係止されており、それ
によつて分離爪７の爪先７ａは定着ローラ１の表
面に接触する回動習性を与えられている。分離爪
７は定着ローラ１よりも離型性の悪い材料よりな
り、その爪先７ａには凹部７ｂが形成され、こゝ
にバイメタル１５が取付けられている。第２図
は、定着ローラ１の表面温度が一定の温度（例え
ばトナーの軟化点）に達し、バイメタル１５が凹
部７ｂの内側へ彎曲し、よつて引張ばね１３の作
用下に分離爪７の爪先７ａが定着ローラ１の表面
に接している状態を示す。 In FIG. 2, the separation claw 7 is rotatably mounted on a support shaft 11, one end of a tension spring 13 is locked to a pin 12 provided at the rear end of the separation claw, and the other end is attached to the machine frame. The toe 7a of the separation claw 7 is thereby given a rotational habit of coming into contact with the surface of the fixing roller 1. The separation claw 7 is made of a material having a worse releasing property than the fixing roller 1, and has a recess 7b formed in its claw tip 7a, and a bimetal 15 is attached thereto. FIG. 2 shows that when the surface temperature of the fixing roller 1 reaches a certain temperature (for example, the softening point of toner), the bimetal 15 curves inward into the recess 7b, and the toe of the separating claw 7 is bent under the action of the tension spring 13. 7a is shown in contact with the surface of the fixing roller 1.
これに対し第３図は、定着ローラ１の表面温度
が上記一定温度以下の場合を示し、バイメタル１
５は凹部７ｂの外側へ彎曲して定着ローラ１の表
面に接触し、従つて分離爪７の爪先７ａは上記表
面より離隔している。バイメタル１５の定着ロー
ラに接する側の面には、摩擦係数が低く離型性の
よい材料、例えばテフロンをコーテイングしてお
くと有利である。 On the other hand, FIG. 3 shows a case where the surface temperature of the fixing roller 1 is below the above-mentioned constant temperature, and the bimetal 1
5 is bent toward the outside of the recess 7b and comes into contact with the surface of the fixing roller 1, so that the toe 7a of the separation claw 7 is spaced apart from the surface. It is advantageous to coat the surface of the bimetal 15 in contact with the fixing roller with a material having a low coefficient of friction and good releasability, such as Teflon.
上述のように、当初定着ローラ１が充分に加熱
されていない段階では、バイメタル１５が定着ロ
ーラ１の表面に接し、分離爪はこれより離隔して
おり、定着ローラが加熱されて一定温度に達する
と、バイメタルが変形して定着ローラの表面より
離隔し、分離爪の爪先が徐々に定着ローラに接触
する。従つて、トナー固着に起因する起動時のト
ルク増大を防止することが出来、定着ローラの起
動は円滑に行われる。 As described above, when the fixing roller 1 is not sufficiently heated initially, the bimetal 15 is in contact with the surface of the fixing roller 1, and the separating claw is further away from this, and the fixing roller is heated and reaches a certain temperature. Then, the bimetal is deformed and separated from the surface of the fixing roller, and the tip of the separating claw gradually comes into contact with the fixing roller. Therefore, it is possible to prevent an increase in torque at startup due to toner adhesion, and the fixing roller can be started smoothly.
複写サイクルでコピーをとりつづけると、分離
手段と定着ローラとの接触部位にトナーが溜ま
る。複写サイクルが終了し機械が停止すると、定
着ローラは徐々に冷却し、その表面温度が上記せ
る一定値以下になると、バイメタルが定着ローラ
表面に接し、分離手段はこの表面より離れる。こ
の場合、分離手段は定着ローラの表面よりも離型
性の悪い材料が選択されており、更に一般に分離
手段の温度は定着ローラの表面温度よりも低いの
で、トナーは分離手段に付着したまゝ分離手段と
共に定着ローラの表面より離隔する。 When copies are continued in the copying cycle, toner accumulates at the contact area between the separating means and the fixing roller. When the copying cycle is completed and the machine is stopped, the fuser roller gradually cools down, and when its surface temperature falls below the above-described certain value, the bimetal comes into contact with the surface of the fuser roller and the separation means separates from this surface. In this case, the material for the separating means is selected to have worse release properties than the surface of the fixing roller, and the temperature of the separating means is generally lower than the surface temperature of the fixing roller, so the toner remains attached to the separating means. It is separated from the surface of the fixing roller together with the separating means.
定着ローラの表面は制御装置により温度制御を
行うことが普通であるが、上述せる実施例におけ
るバイメタルの代りに、上記制御装置の検知素子
からの信号により、定着ローラよりの分離手段の
接離を行うことも可能である。 Normally, the temperature of the surface of the fixing roller is controlled by a control device, but instead of the bimetal in the above embodiment, a signal from a detection element of the control device controls the separation means from the fixing roller. It is also possible to do so.
本発明は、上述のように、比較的簡単な方法で
定着ローラの起動を円滑に行い得る特長を有す
る。 As described above, the present invention has the advantage that the fixing roller can be smoothly started using a relatively simple method.
第１図は本発明により構成した加熱ローラ定着
装置の図式図、第２図は本発明の主要部の拡大
図、第３図は定着ローラが一定温度以下にあると
きの定着ローラと分離爪との関係を示す説明であ
る。
１……定着ローラ、２……加圧ローラ、３……
トナー像支持シート、７……分離爪、７ａ……爪
先、１５……バイメタル。
FIG. 1 is a schematic diagram of a heating roller fixing device constructed according to the present invention, FIG. 2 is an enlarged view of the main parts of the present invention, and FIG. 3 is a diagram showing the fixing roller and separation claw when the fixing roller is below a certain temperature. This is an explanation showing the relationship. 1... Fixing roller, 2... Pressure roller, 3...
Toner image support sheet, 7... Separation claw, 7a... Toe, 15... Bimetal.
Claims (1)
段を具備する加熱ローラ定着装置に於て、上記分
離手段をローラ表面温度に依存してローラ表面に
接離させる手段を設け、この手段が分離手段をロ
ーラ表面温度がトナー軟化点を含むその近傍の一
定温度以上でローラ表面に接触させ、上記一定温
度以下でローラ表面より離隔させることを特徴と
する装置。 ２ 分離手段が分離爪であり、接離させる手段が
分離爪に設けたバイメタルであり、トナー軟化点
を含むその近傍の一定温度以上ではバイメタルが
ローラ表面より離れる方向に変形することにより
分離爪がローラ表面に接触し、上記一定温度以下
ではバイメタルがローラ表面に接する方向に変形
することにより分離爪がローラ表面より離隔する
ことを特徴とする特許請求の範囲第１項に記載の
加熱ローラ定着装置。 ３ ローラ表面に対する分離手段の接離を、ロー
ラ表面の温度制御を行う制御装置の検知素子より
の信号により行うことを特徴とする特許請求の範
囲第１項に記載の加熱ローラ定着装置。[Scope of Claims] 1. In a heating roller fixing device equipped with a separating means for separating the toner image support from the roller, means is provided for causing the separating means to approach and separate from the roller surface depending on the roller surface temperature, An apparatus characterized in that this means brings the separating means into contact with the roller surface when the roller surface temperature is above a certain temperature in the vicinity of the toner softening point, and separates the separating means from the roller surface when the roller surface temperature is below the certain temperature. 2. The separating means is a separating pawl, and the means for bringing it into contact with and separating from it is a bimetal provided on the separating pawl, and at temperatures above a certain temperature in the vicinity of the toner softening point, the bimetal deforms in a direction away from the roller surface, causing the separation pawl to deform. The heating roller fixing device according to claim 1, wherein the separating claw is separated from the roller surface by contacting the roller surface and deforming the bimetal in a direction in which the bimetal comes into contact with the roller surface when the temperature is below the certain temperature. . 3. The heating roller fixing device according to claim 1, wherein the separation means is brought into contact with and separated from the roller surface by a signal from a detection element of a control device that controls the temperature of the roller surface.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6496279A JPS55156975A (en) | 1979-05-28 | 1979-05-28 | Heating roller fixing device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6496279A JPS55156975A (en) | 1979-05-28 | 1979-05-28 | Heating roller fixing device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS55156975A JPS55156975A (en) | 1980-12-06 |
| JPS629906B2 true JPS629906B2 (en) | 1987-03-03 |
Family
ID=13273170
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP6496279A Granted JPS55156975A (en) | 1979-05-28 | 1979-05-28 | Heating roller fixing device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS55156975A (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5858U (en) * | 1981-06-26 | 1983-01-05 | アイシン精機株式会社 | automotive fluid reservoir |
| JP4810196B2 (en) * | 2005-11-18 | 2011-11-09 | 株式会社リコー | Fixing apparatus and image forming apparatus |
| JP5570075B2 (en) * | 2011-09-08 | 2014-08-13 | 京セラドキュメントソリューションズ株式会社 | Fixing apparatus and image forming apparatus having the same |
| JP5810194B2 (en) * | 2014-06-23 | 2015-11-11 | 京セラドキュメントソリューションズ株式会社 | Fixing apparatus and image forming apparatus having the same |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS522602A (en) * | 1975-06-23 | 1977-01-10 | Nippon Synthetic Chem Ind | Photoosensitive resin composition |
-
1979
- 1979-05-28 JP JP6496279A patent/JPS55156975A/en active Granted
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS522602A (en) * | 1975-06-23 | 1977-01-10 | Nippon Synthetic Chem Ind | Photoosensitive resin composition |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS55156975A (en) | 1980-12-06 |
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