JPH01107287A - Fixing device for copying machine - Google Patents

Fixing device for copying machine

Info

Publication number
JPH01107287A
JPH01107287A JP26577887A JP26577887A JPH01107287A JP H01107287 A JPH01107287 A JP H01107287A JP 26577887 A JP26577887 A JP 26577887A JP 26577887 A JP26577887 A JP 26577887A JP H01107287 A JPH01107287 A JP H01107287A
Authority
JP
Japan
Prior art keywords
temperature
surface temperature
roller
heating roller
toner
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
JP26577887A
Other languages
Japanese (ja)
Inventor
Shinji Matsumoto
真治 松本
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.)
Fujifilm Business Innovation Corp
Original Assignee
Fuji Xerox Co Ltd
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 Fuji Xerox Co Ltd filed Critical Fuji Xerox Co Ltd
Priority to JP26577887A priority Critical patent/JPH01107287A/en
Publication of JPH01107287A publication Critical patent/JPH01107287A/en
Pending legal-status Critical Current

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  • Fixing For Electrophotography (AREA)

Abstract

PURPOSE:To obtain an excellent copy without the occurrence of a hot offset phenomenon by setting the surface temperature of a heating roller in the hot offset temperature of toner or below and setting the surface temperature of a pressurizing roller higher than the surface temperature of the heating roller so that the temperature can be respectively controlled. CONSTITUTION:The heating roller 1 and the pressurizing roller 3 respectively incorporating heating sources 2 and 4 in them are controlled in terms of the surface temperatures by temperature control means 5a-9a and 5b-9b respectively. The surface temperature of the heating roller 1 on a side where it contacts to a toner image 11 on copying paper 10 is controlled to be lower than the hot offset temperature of the toner. And the surface temperature of the pressurizing roller 3 on a side where it does not contact to the toner image 11 is controlled to be a temperature at which the toner is sufficiently heated and melted. Thus, the hot offset phenomenon does not occur and the excellent copy can be obtained.

Description

【発明の詳細な説明】 〔産業上の利用分野〕 本発明は、複写機の定着工程において、複写用紙上のト
ナーを充分に加熱溶融し、鮮明な画像を得るようにした
複写機の定着装置に関する。
Detailed Description of the Invention [Industrial Application Field] The present invention provides a fixing device for a copying machine that sufficiently heats and melts the toner on copy paper in the fixing process of the copying machine to obtain a clear image. Regarding.

〔従来の技術〕[Conventional technology]

複写用紙に転写されたトナー像を定着する複写機の定着
装置として、加熱ローラと加圧ローラからなる一対のロ
ーラで複写用紙を加熱・加圧して定着する熱ローラ方式
の定着装置がある。この方式のものは、他の方式の定着
装置に比較して消費電力が少ないこと、定着部での用紙
の走行性能が優れているので紙詰まりが少ないこと、発
煙1発火の危険が少ないこと等の利点を有するため広く
用いられている。
2. Description of the Related Art As a fixing device for a copying machine that fixes a toner image transferred to copy paper, there is a heat roller type fixing device that heats and presses the copy paper to fix it using a pair of rollers including a heating roller and a pressure roller. This type of fixing device consumes less power than other types of fixing devices, has excellent paper running performance in the fixing unit, so there are fewer paper jams, and there is less risk of smoke or ignition. It is widely used because of its advantages.

“〔発明が解決しようとする問題点〕 上記のような熱ローラ方式の定着装置によって定着を行
う場合、特にカラーコピーの場合は、白黒コピーの場合
°以上に充分にトナーを加熱溶融しなげれば良好な発色
が得られない。
“[Problems to be Solved by the Invention] When fixing is performed using a heat roller type fixing device as described above, especially in the case of color copying, the toner cannot be sufficiently heated and melted than in the case of black-and-white copying. Otherwise, good color development cannot be obtained.

特に、0HP(オーバーへラドプロジェクタ)用フィル
ムにカラーコピーする場合は、複写された像に光の透過
性が必要となるため、従来では、処理スピードを遅くし
、トナーに充分な溶融時間を与えるようにしていた。
In particular, when color copying is performed on 0HP (Overhead Projector) film, the copied image needs to be transparent to light, so conventional methods have been to slow down the processing speed and give the toner enough time to melt. That's what I was doing.

ところが、溶融時間を長くすると、溶融したトナーの表
面の一部が加熱ローラに付着する、いわゆるホットオフ
セット現象が発生するという問題があった。
However, when the melting time is increased, there is a problem that a so-called hot offset phenomenon occurs in which a portion of the surface of the melted toner adheres to the heating roller.

このホットオフセット現象が発生すると、トナー像の表
面が凹凸になってその部分の光の透過性がなくなり、投
影画像に黒点が発生する。また、トナーが加熱ローラに
付着すると、次にそのトナー付着部分に到来した複写用
紙に付着トナーが転写されて用紙が汚れる。
When this hot offset phenomenon occurs, the surface of the toner image becomes uneven and light transmittance disappears in that area, causing black dots to appear on the projected image. Furthermore, when the toner adheres to the heating roller, the adhered toner is transferred to a copy sheet that arrives at the toner-adhered area, thereby staining the sheet.

本発明は、上記の問題点を解消し、OHP用フィルムの
カラーコピーの場合のように発色性と透過性を要求され
るものに対しても、熱ローラ方式による定着時にホット
オフセット現象が発生することなく良好なコピーが得ら
れるようにすることを目的とする。
The present invention solves the above-mentioned problems and prevents the hot offset phenomenon from occurring during fixing using a heat roller method, even in cases where color development and transparency are required, such as in the case of color copying of OHP films. The purpose is to make it possible to obtain good copies without any problems.

〔問題点を解決するための手段〕[Means for solving problems]

本発明の定着装置は、その目的を達成するために、それ
ぞれ熱源を有する加熱ローラと加圧ローラとからなる複
写機の定着装置において、前記加熱ローラと加圧ローラ
の表面温度をそれぞれ制御する温度制御手段を備え、且
つ、加熱ローラの表面温度はトナーのホットオフセット
温度より低い温度(、ご設定し、加圧ローラの表面温度
は前記加熱ローラの設定温度よりも高い温度に設定した
ことを特徴とする。
In order to achieve the object, the fixing device of the present invention is a fixing device for a copying machine that includes a heating roller and a pressure roller, each having a heat source. A control means is provided, and the surface temperature of the heating roller is set to a temperature lower than the hot offset temperature of the toner, and the surface temperature of the pressure roller is set to a temperature higher than the set temperature of the heating roller. shall be.

〔作用〕[Effect]

本発明の定着装置によると、それぞれ内部に熱源を有す
る加熱ローラと加圧ローラは、温度制御手段によりそれ
ぞれ表面温度が制御される。そして、複写用紙上のトナ
ー画像と接触する側の加熱ローラの表面温度はトナーの
ホットオフセット温度より低い温度に制御される。また
、トナー画像と接触しない側の加圧ローラの表面温度は
トナーが充分に加熱溶融される温度に制御される。これ
によって、ホットオフセット現象が発生することなく、
良好なコピーを得ることができる。
According to the fixing device of the present invention, the surface temperature of the heating roller and the pressure roller, each of which has a heat source inside, is controlled by the temperature control means. The surface temperature of the heating roller on the side that comes into contact with the toner image on the copy paper is controlled to a temperature lower than the hot offset temperature of the toner. Further, the surface temperature of the pressure roller on the side not in contact with the toner image is controlled to a temperature at which the toner is sufficiently heated and melted. This prevents the hot offset phenomenon from occurring.
You can get a good copy.

〔実施例〕〔Example〕

以下、図面を参照しながら、本発明の特徴を具体的に説
明する。
Hereinafter, the features of the present invention will be specifically explained with reference to the drawings.

第1図は、本発明の実施例における制御系を示す図であ
る。
FIG. 1 is a diagram showing a control system in an embodiment of the present invention.

加熱ローラl及び加圧ローラ3自体は従来公知のものと
同じであり、内部に熱源としての加熱ランプ2及び4が
設けられている。複写用紙IO上のトナー像11は、加
熱ローラ1と加圧ローラ3により加熱・加圧されて定着
される。
The heating roller 1 and the pressure roller 3 themselves are the same as those conventionally known, and heating lamps 2 and 4 as heat sources are provided inside. The toner image 11 on the copy paper IO is fixed by being heated and pressed by the heating roller 1 and the pressure roller 3.

本実施例においては、加熱ローラ1及び加圧ローラ3の
表面近傍にそれぞれ温度検出器5a及び5bが設置され
、各ローラの表面温度が予め設定した温度になるように
加熱制御される。
In this embodiment, temperature detectors 5a and 5b are installed near the surfaces of the heating roller 1 and the pressure roller 3, respectively, and the heating is controlled so that the surface temperature of each roller becomes a preset temperature.

すなわち、加熱ローラIの表面温度は、温度検出器5a
により検出され、増幅器6aで増幅された後比較器8a
において設定器7aからの設定温度と比較され、その差
に応じた制御器9aの出力により、設定温度となるよう
に制御される。
That is, the surface temperature of the heating roller I is determined by the temperature detector 5a.
after being detected by the comparator 8a and amplified by the amplifier 6a.
The temperature is compared with the set temperature from the setting device 7a, and the temperature is controlled to the set temperature by the output of the controller 9a according to the difference.

同様にして、加圧ローラ3の表面温度は、温度検出器5
bにより検出され、増幅器6bで増幅された後比較器8
bに右いて設定器7bからの設定温度と比較され、その
差に応じた制御器9bの出力により、設定温度となるよ
うに制御される。
Similarly, the surface temperature of the pressure roller 3 is detected by the temperature detector 5.
b, and after being amplified by the amplifier 6b, the comparator 8
It is compared with the set temperature from the setting device 7b at the right side of the temperature control device 7b, and the temperature is controlled to reach the set temperature by the output of the controller 9b according to the difference.

ここで、加熱ローラ1の表面温度の設定値は、前記した
ホットオフセット現象が発生する温度より低い温度Ta
(たとえば150℃)とし、加圧ローラ3の表面温度の
設定値は、加熱ローラ1の設定温度T、より高い温度T
b(180〜200℃)とする。
Here, the set value of the surface temperature of the heating roller 1 is a temperature Ta lower than the temperature at which the hot offset phenomenon described above occurs.
(for example, 150°C), and the set value of the surface temperature of the pressure roller 3 is the set temperature T of the heating roller 1, the higher temperature T
b (180-200°C).

このように加熱ローラ1と加圧ローラ3の表面温度が制
御された状態のもとでは、複写用紙10上のトナー像1
1は、加熱ローラ1によって温度Ta以上に加熱される
ことはなく、従って、ホットオフセット現象を生じるこ
とはない。
When the surface temperatures of the heating roller 1 and the pressure roller 3 are controlled in this way, the toner image 1 on the copy paper 10
1 is never heated to a temperature higher than Ta by the heating roller 1, and therefore no hot offset phenomenon occurs.

一方、トナー像11は複写用紙10を介して加圧ローラ
3により間接的に加熱され、しかも、この加圧ローラ3
の設定表面温度Tb は加熱ローラ1の設定表面温度T
aよりは高いので、トナー像11は充分に加熱溶融され
、良好な発色のコピーを得ることができる。特にOHP
用フィルムのカラーコピーにおいて、発色と透過性の良
いコピーを得ることができる。
On the other hand, the toner image 11 is indirectly heated by the pressure roller 3 via the copy paper 10, and this pressure roller 3
The set surface temperature Tb is the set surface temperature T of the heating roller 1.
Since the toner image 11 is heated and melted sufficiently, a copy with good color development can be obtained. Especially OHP
In color copying of commercial film, copies with good color development and transparency can be obtained.

第2図は、加熱ローラ1と加圧ローラ3の加熱開始初期
における表面温度曲線を示すグラフである。図中曲線■
は加熱ローラ1の表面温度曲線を示し、曲線■は加圧ロ
ーラ3の表面温度曲線を示す。加熱ローラ1は金属製ロ
ーラで熱伝導性がよいので、合成樹脂製の加圧ローラ3
よりも速く設定表面温度に到達する。両ローラとも設定
表面温度に到達後は、その温度に維持される。
FIG. 2 is a graph showing surface temperature curves of the heating roller 1 and the pressure roller 3 at the initial stage of heating. Curve in the figure■
2 shows the surface temperature curve of the heating roller 1, and the curve 3 shows the surface temperature curve of the pressure roller 3. Since the heating roller 1 is a metal roller with good thermal conductivity, the pressure roller 3 is made of synthetic resin.
Reach the set surface temperature faster than After both rollers reach the set surface temperature, they are maintained at that temperature.

本装置においては、上記のような温度制御を行うための
切換えスイッチを複写装置本体に設けることができる。
In this apparatus, a changeover switch for controlling the temperature as described above can be provided on the main body of the copying apparatus.

そ−して、たとえばOHP用フィルムにカラーコピーす
る場合は、オペレータが同切換えスイッチのOHP用を
選択して、加熱ローラ1の設定表面温度Ta と加圧ロ
ーラ3の設定表面温度Tb をそれぞれ上記のように設
定することができる。また、通常のコピーの場合は、加
圧ローラ3の表面設定温度はoHP用の場合に比して低
くてもよいので、同切換えスイッチの通常用を選択して
、加圧ローラ3の表面設定温度を変更する。
For example, when color copying is to be performed on an OHP film, the operator selects the OHP switch and sets the set surface temperature Ta of the heating roller 1 and the set surface temperature Tb of the pressure roller 3 to the above values. It can be set as follows. In addition, in the case of normal copying, the surface setting temperature of the pressure roller 3 may be lower than that for oHP, so select the normal use of the changeover switch and set the surface temperature of the pressure roller 3. Change temperature.

〔発明の効果〕〔Effect of the invention〕

以上説明したように、本発明の定着装置によると、複写
用紙のトナー像と接触する加熱ローラの表面温度をトナ
ーのホットオフセット温度以下に設定し、加圧ローラの
表面温度を加熱ローラの表面温度より高く設定してそれ
ぞれ温度制御するようにしたので、トナーはホットオフ
セット現象が発生することなく充分に加熱溶融されて、
カラーコピーの場合も発色の良いコピーが得られる。ま
た、ホットオフセット現象が発生しないので、複写用紙
の汚れがなく、特にOHP用フィルムのカラーコピーの
場合は透過性の良いカラーコピーが得られる。
As explained above, according to the fixing device of the present invention, the surface temperature of the heating roller that comes into contact with the toner image on the copy paper is set to be lower than the hot offset temperature of the toner, and the surface temperature of the pressure roller is set to the surface temperature of the heating roller. Since the temperature is set higher and each temperature is controlled, the toner is sufficiently heated and melted without causing the hot offset phenomenon.
Even in the case of color copying, copies with good color reproduction can be obtained. Furthermore, since no hot offset phenomenon occurs, the copy paper is free from stains, and color copies with good transparency can be obtained, especially in the case of color copies of OHP films.

【図面の簡単な説明】[Brief explanation of the drawing]

第1図は本発明の実施例における制御系を示す図であり
、第2図は加熱ローラ及び加圧ローラの表面温度曲線を
示すグラフである。 1:加熱ローラ    3:加圧ローラ2.4:加熱ラ
ンプ   5a、 5b:温度検出器10:?Jt写用
紙用紙  11:トナー像Ta:加熱ローラの設定表面
温度。 Tb:加圧ローラの設定表面温度
FIG. 1 is a diagram showing a control system in an embodiment of the present invention, and FIG. 2 is a graph showing surface temperature curves of a heating roller and a pressure roller. 1: Heat roller 3: Pressure roller 2.4: Heat lamp 5a, 5b: Temperature detector 10:? Jt photo paper 11: Toner image Ta: Set surface temperature of heating roller. Tb: Set surface temperature of pressure roller

Claims (1)

【特許請求の範囲】[Claims] 1、それぞれ熱源を有する加熱ローラと加圧ローラとか
らなる複写機の定着装置において、前記加熱ローラと加
圧ローラの表面温度をそれぞれ制御する温度制御手段を
備え、且つ、加熱ローラの表面温度はトナーのホットオ
フセット温度より低い温度に設定し、加圧ローラの表面
温度は前記加熱ローラの設定温度よりも高い温度に設定
したことを特徴とする複写機の定着装置。
1. A fixing device for a copying machine consisting of a heating roller and a pressure roller each having a heat source, including a temperature control means for controlling the surface temperature of the heating roller and the pressure roller, respectively, and the surface temperature of the heating roller is A fixing device for a copying machine, wherein the temperature is set lower than the hot offset temperature of toner, and the surface temperature of the pressure roller is set higher than the set temperature of the heating roller.
JP26577887A 1987-10-20 1987-10-20 Fixing device for copying machine Pending JPH01107287A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP26577887A JPH01107287A (en) 1987-10-20 1987-10-20 Fixing device for copying machine

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP26577887A JPH01107287A (en) 1987-10-20 1987-10-20 Fixing device for copying machine

Publications (1)

Publication Number Publication Date
JPH01107287A true JPH01107287A (en) 1989-04-25

Family

ID=17421906

Family Applications (1)

Application Number Title Priority Date Filing Date
JP26577887A Pending JPH01107287A (en) 1987-10-20 1987-10-20 Fixing device for copying machine

Country Status (1)

Country Link
JP (1) JPH01107287A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH05181383A (en) * 1991-10-29 1993-07-23 Konica Corp Fixing device
JP2001255768A (en) * 2000-03-10 2001-09-21 Konica Corp Thermal fixing device and image forming device
JP2013127603A (en) * 2011-10-20 2013-06-27 Toshiba Corp Image forming apparatus, image forming method, and fixing device

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH05181383A (en) * 1991-10-29 1993-07-23 Konica Corp Fixing device
JP2001255768A (en) * 2000-03-10 2001-09-21 Konica Corp Thermal fixing device and image forming device
JP2013127603A (en) * 2011-10-20 2013-06-27 Toshiba Corp Image forming apparatus, image forming method, and fixing device

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