JPH0636121B2 - Heat fixing roll for copier - Google Patents
Heat fixing roll for copierInfo
- Publication number
- JPH0636121B2 JPH0636121B2 JP61224333A JP22433386A JPH0636121B2 JP H0636121 B2 JPH0636121 B2 JP H0636121B2 JP 61224333 A JP61224333 A JP 61224333A JP 22433386 A JP22433386 A JP 22433386A JP H0636121 B2 JPH0636121 B2 JP H0636121B2
- Authority
- JP
- Japan
- Prior art keywords
- fixing roll
- copying machine
- machine according
- heat fixing
- heat
- 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 - Lifetime
Links
- 238000010438 heat treatment Methods 0.000 claims description 55
- 239000010408 film Substances 0.000 claims description 32
- 239000000463 material Substances 0.000 claims description 12
- 229910052782 aluminium Inorganic materials 0.000 claims description 8
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 8
- 239000011347 resin Substances 0.000 claims description 7
- 229920005989 resin Polymers 0.000 claims description 7
- 239000011248 coating agent Substances 0.000 claims description 5
- 238000000576 coating method Methods 0.000 claims description 5
- 230000020169 heat generation Effects 0.000 claims description 5
- 230000000873 masking effect Effects 0.000 claims description 5
- YCKRFDGAMUMZLT-UHFFFAOYSA-N Fluorine atom Chemical compound [F] YCKRFDGAMUMZLT-UHFFFAOYSA-N 0.000 claims description 4
- 229910052731 fluorine Inorganic materials 0.000 claims description 4
- 239000011737 fluorine Substances 0.000 claims description 4
- 238000007750 plasma spraying Methods 0.000 claims description 4
- 238000005507 spraying Methods 0.000 claims description 4
- 239000010409 thin film Substances 0.000 claims description 4
- 238000005219 brazing Methods 0.000 claims description 3
- 238000007751 thermal spraying Methods 0.000 claims description 3
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 2
- 229910001374 Invar Inorganic materials 0.000 claims description 2
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims description 2
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims description 2
- 229910052710 silicon Inorganic materials 0.000 claims description 2
- 239000010703 silicon Substances 0.000 claims description 2
- 229910052596 spinel Inorganic materials 0.000 claims description 2
- 239000011029 spinel Substances 0.000 claims description 2
- 238000004804 winding Methods 0.000 claims description 2
- 238000000638 solvent extraction Methods 0.000 claims 1
- 239000011295 pitch Substances 0.000 description 21
- 229910052751 metal Inorganic materials 0.000 description 15
- 239000002184 metal Substances 0.000 description 15
- 238000009826 distribution Methods 0.000 description 9
- LFYJSSARVMHQJB-QIXNEVBVSA-N bakuchiol Chemical compound CC(C)=CCC[C@@](C)(C=C)\C=C\C1=CC=C(O)C=C1 LFYJSSARVMHQJB-QIXNEVBVSA-N 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 229910018072 Al 2 O 3 Inorganic materials 0.000 description 2
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 2
- 230000008878 coupling Effects 0.000 description 2
- 238000010168 coupling process Methods 0.000 description 2
- 238000005859 coupling reaction Methods 0.000 description 2
- 230000017525 heat dissipation Effects 0.000 description 2
- 238000005498 polishing Methods 0.000 description 2
- 230000002265 prevention Effects 0.000 description 2
- 238000013459 approach Methods 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000007733 ion plating Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 229910001120 nichrome Inorganic materials 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 229910000679 solder Inorganic materials 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 238000004544 sputter deposition Methods 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000007740 vapor deposition Methods 0.000 description 1
Landscapes
- Fixing For Electrophotography (AREA)
- Control Of Resistance Heating (AREA)
- Resistance Heating (AREA)
Description
【発明の詳細な説明】 産業上の利用分野 この発明は、複写機に用いる熱定着ロールに関するもの
で、更に述べると電子複写機用熱定着ロールに関するも
のである。Description: FIELD OF THE INVENTION The present invention relates to a heat fixing roll used in a copying machine, and more specifically to a heat fixing roll for an electronic copying machine.
従来の技術 電子複写機には、着色トナーと樹脂を主成分とする乾式
現象剤を支持体上に加熱定着させるために熱定着ロール
が設けられている。2. Description of the Related Art An electronic copying machine is provided with a heat fixing roll for heating and fixing a dry-type developing agent containing a colored toner and a resin as main components on a support.
従来の熱定着ロールは、円筒状の金属製支持体の内側に
発熱体を設け、この発熱体により熱定着ロール表面を加
熱している。In the conventional heat fixing roll, a heating element is provided inside a cylindrical metal support, and the surface of the heat fixing roll is heated by this heating element.
しかし、この加熱方法は、発熱体の輻射熱によるので、
ヒートアップタイム，即ち、複写機起動時より複写機使
用可能となるまでの時間が長く、約１〜２分かかる。However, since this heating method depends on the radiant heat of the heating element,
The heat-up time, that is, the time from when the copying machine is started to when the copying machine can be used is long, and it takes about 1 to 2 minutes.
そこで、このヒートアップタイムを短縮するため支持体
の表面に面状発熱抵抗体を設け、その一端から他端に向
って電流を流し、この時発生するジュール熱により直接
ロール表面を加熱する所謂面状発熱抵抗体型の熱定着ロ
ールが用いられる。Therefore, in order to shorten the heat-up time, a planar heating resistor is provided on the surface of the support, a current is made to flow from one end to the other end, and the so-called surface that directly heats the roll surface by the Joule heat generated at this time. The heat-fixing roll of the heat generating resistor type is used.
ところが、この面状発熱体の厚さは、均一なので、熱定
着ロールの軸方向の表面温度分布は第８図の曲線０に示
すようにロール両端部１０ａが、その中央部１０Ｃに比
べ低くなる。However, since the thickness of the sheet heating element is uniform, the surface temperature distribution in the axial direction of the heat fixing roll is lower at both end portions 10a of the roll than at the central portion 10C thereof as shown by the curve 0 in FIG. .
そのため均一な画像を得ることが困難となる。そこで、
従来、熱定着ロールの抵抗体膜を一定の厚さに形成し、
この抵抗体膜をロール両端近くで削り取り、その部分の
抵抗値を大きくすることにより前記温度分布の均一化を
図っている。（昭和５９年特開第154476号公報参照） 発明が解決しようとする問題点 従来例ではロール両端近くの抵抗体膜を削り取る作業が
必要であるが、この作業は面倒であり、多くの時間と労
力を必要とするので、ロールのコストアップの原因とな
る。Therefore, it becomes difficult to obtain a uniform image. Therefore,
Conventionally, the resistor film of the heat fixing roll is formed to have a constant thickness,
This resistor film is scraped off near both ends of the roll, and the resistance value at that portion is increased to make the temperature distribution uniform. (Refer to Japanese Patent Laid-Open No. 154476 in 1984) Problems to be Solved by the Invention In the conventional example, it is necessary to scrape off the resistor film near both ends of the roll, but this work is troublesome and takes a lot of time and time. Since labor is required, it causes an increase in roll cost.
又、抵抗体膜の厚さは、薄く、例えば50μｍの厚さなの
で、この膜を削り所定の厚さにすることは、極めて困難
であり、そのためロール表面の温度分布は不均一なもの
となりやすい。Further, since the resistor film is thin, for example, 50 μm thick, it is extremely difficult to grind this film to a predetermined thickness, so that the temperature distribution on the roll surface tends to be non-uniform. .
この発明は上記事情に鑑み、熱定着ロールの表面温度分
布を均一にすることを目的とする。他の目的はコストの
安い熱定着ロールを得ることである。In view of the above circumstances, the present invention has an object to make the surface temperature distribution of the heat fixing roll uniform. Another object is to obtain a heat fixing roll at a low cost.
問題点を解決するための手段 この発明は、円筒状の絶縁性支持体の表面に帯状の発熱
抵抗体を、ねじ状に形成すると共に、該発熱抵抗体のピ
ッチをロールの中央部から両端部に向って徐々に小さく
することにより上記問題を解決するものである。MEANS FOR SOLVING THE PROBLEMS The present invention forms a strip-shaped heating resistor on the surface of a cylindrical insulating support in a screw shape, and pitches the heating resistor from the center to both ends of the roll. The above problem is solved by gradually reducing the size toward.
作用 帯状の発熱抵抗体に電流を流すと、この電流はジュール
熱により抵抗体を加熱しながら螺旋状に流れる。When a current is passed through the strip-shaped heating resistor, this current flows in a spiral while heating the resistor by Joule heat.
この時通常は、ロールの中央部より両端部の方が抵抗値
が大きいので、両端部の方が中央部より発熱量が大きく
なり、ロール表面の温度分布は均一となる。At this time, since the resistance value at both end portions is usually larger than that at the central portion of the roll, the both end portions generate a larger amount of heat than the central portion, and the temperature distribution on the roll surface becomes uniform.
実施例 この発明の一実施例を添付図面により説明すると、第１
図においてP0は金属製中空パイプで、このパイプP0の表
面には第２図に示す如く、絶縁層１が形成され、更にそ
の絶縁層１の表面には発熱抵抗体２が形成されている。Embodiment An embodiment of the present invention will be described with reference to the accompanying drawings.
In the figure, P 0 is a hollow metal pipe, an insulating layer 1 is formed on the surface of the pipe P 0 as shown in FIG. 2, and a heating resistor 2 is further formed on the surface of the insulating layer 1. There is.
この絶縁層１はアルミナ（Al2O3）やスピネル（Al2O3・
MgO）等をプラズマ溶射することにより形成される薄膜
であり、その厚さは例えば200μｍである。This insulating layer 1 is made of alumina (Al 2 O 3 ) or spinel (Al 2 O 3
It is a thin film formed by plasma spraying MgO) or the like, and its thickness is, for example, 200 μm.
又、発熱抵抗体２は次のようにして形成される。先ず、
絶縁層１の表面に第３図に示す様にマスキング線材、例
えば、金属線４を螺旋状に巻き付ける。The heating resistor 2 is formed as follows. First,
As shown in FIG. 3, a masking wire, for example, a metal wire 4 is spirally wound around the surface of the insulating layer 1.
この金属線４として、例えば、溶射時のマスキング線材
の熱膨脹を防ぐために径0.6mmのインバール線を用いる
のがよいが、銅線を高張力で用いることもできる。As the metal wire 4, for example, an Invar wire having a diameter of 0.6 mm is preferably used in order to prevent thermal expansion of the masking wire material during thermal spraying, but a copper wire can also be used with high tension.
金属線４のピッチＰは、熱定着ロール１０の中央部１０
ｃ，側部１０ｂ，端部１０ａの順に狭くなっており、例
えば端部１０ａのピッチＰ１は４mm，側部１０ｂのピッ
チＰ２は５mm，中央部１０ｃのピッチＰ３は、６mmであ
る。The pitch P of the metal wires 4 is the central portion 10 of the heat fixing roll 10.
c, the side portion 10b, and the end portion 10a, the pitch P 1 of the end portion 10a is 4 mm, the pitch P 2 of the side portion 10b is 5 mm, and the pitch P 3 of the central portion 10c is 6 mm.
このようにして、金属線４を巻き付けた後、その上から
抵抗材料、例えば、ニクロム，ステンレス，ニッケル，
アルミニウム，又はアルミロウを、溶射ガンＧにより溶
射し発熱抵抗体２を形成する。After winding the metal wire 4 in this way, a resistance material such as nichrome, stainless steel, nickel,
Aluminum or aluminum brazing is sprayed by the spray gun G to form the heating resistor 2.
このアルミニウム又はアルミロウは高温による抵抗値の
変化がない上安価なので、抵抗材料としては最適であ
る。この抵抗体２は薄膜状でその厚さｄは例えば40μｍ
である。This aluminum or aluminum brazing material is suitable as a resistance material because it does not change in resistance value due to high temperature and is inexpensive. The resistor 2 is a thin film and has a thickness d of, for example, 40 μm.
Is.
この場合、空気でアルミをプラズマ溶射又はアーク溶射
（特願昭60-181081又は60-181082号参照）することによ
り安定な発熱抵抗体を形成することができる。なお前記
溶射を用いる代わりに蒸着，スパタリング，イオンプレ
ーティグ等を用いてもよい。その後金属線４をロール１
０の表面から除去すると、金属線４に対応して螺線状の
溝が形成される。即ち、該溝の幅はその全長にわたっ
て、金属線４の径と同一であり、又、隣り合う溝同志の
間隔は、前記金属線４のピッチＰと同様であり、ロール
の中央部１０ｃから、側部１０ｂ、端部１０ａに近づく
程小さくなる。その結果、発熱抵抗体２は第１図に示す
様にねじ状となり、この発熱抵抗体２のピッチ即ち幅
は、ロールの中央部１０ｃから側部１０ｂ、端部１０ａ
に近づく程狭くなる。In this case, a stable heating resistor can be formed by plasma-spraying or arc-spraying aluminum with air (see Japanese Patent Application No. 60-181081 or 60-181082). Instead of using the thermal spraying, vapor deposition, sputtering, ion plating, etc. may be used. Then roll metal wire 4 into roll 1.
When removed from the surface of 0, a spiral groove is formed corresponding to the metal wire 4. That is, the width of the groove is the same as the diameter of the metal wire 4 over the entire length thereof, the interval between adjacent grooves is the same as the pitch P of the metal wire 4, and the distance from the central portion 10c of the roll is It becomes smaller as it approaches the side portion 10b and the end portion 10a. As a result, the heating resistor 2 becomes screw-shaped as shown in FIG. 1, and the pitch or width of the heating resistor 2 is from the central portion 10c to the side portion 10b to the end portion 10a of the roll.
It gets narrower as it gets closer to.
次にロール表面に付着防止膜３を形成するが、この膜３
は、弗素樹脂又はシリコン樹脂コーテングにより例えば
５０μｍの膜厚ｔに形成される。Next, an adhesion prevention film 3 is formed on the roll surface.
Is formed with a film thickness t of, for example, 50 μm by using a fluorine resin or a silicon resin coating.
このコーテング終了後、付着防止膜３の表面を研磨して
平滑にすると共に中空パイプP0の一端に給電部６を設
け、他端に給電部７を設け、該給電部６，７を夫々発熱
抵抗体２の端部に接続する。After this coating is finished, the surface of the adhesion preventing film 3 is polished to be smooth, and the power feeding portion 6 is provided at one end of the hollow pipe P 0 and the power feeding portion 7 is provided at the other end thereof, and the power feeding portions 6 and 7 generate heat respectively. It is connected to the end of the resistor 2.
次に、この実施例の作用につき説明すると、給電部６か
ら発熱抵抗体２に電流を流すと、この電流はジュール熱
により抵抗体２を加熱しながら矢印Ａ１０方向に流れ給
電部７に到達する。Next, the operation of this embodiment will be described. When a current is passed from the power feeding section 6 to the heating resistor 2, this current flows in the direction of arrow A10 while heating the resistor 2 by Joule heat and reaches the power feeding section 7. .
このようにして、ジュール熱によりロール表面温度が上
昇するが、熱定着ロール１０の中央部１０ｃ，側部１０
ｂ，端部１０ａの順に発熱抵抗体２のピッチＰが狭くな
っているので、即ち、高発熱量所要部分のピッチP1，P2
が、他の部分のピッチP3より小さいので、ロール表面温
度はその全長に亙って均一となる。In this way, the surface temperature of the roll rises due to the Joule heat, but the central portion 10c and the side portions 10c of the heat fixing roll 10
b, the pitch P of the heating resistor 2 is narrowed in the order of the end portion 10a, that is, the pitches P 1 and P 2 of the portions requiring a high heat generation amount.
However, since it is smaller than the pitch P 3 of the other portion, the roll surface temperature becomes uniform over the entire length.
これを詳細に説明すると、抵抗値をＲ，物質の比抵抗値
をρ，抵抗体の長さをＬ，抵抗体の断面積をＳとする
と、抵抗値ＲはＲ＝ρ・L/Sで表示される。Explaining this in detail, assuming that the resistance value is R, the specific resistance value of the substance is ρ, the length of the resistor is L, and the cross-sectional area of the resistor is S, the resistance value R is R = ρ · L / S. Is displayed.
ここで発熱抵抗体のピッチをＰ，その厚さをｄ，絶縁層
１の半径をｅとすると、ロール軸方向の単位距離当りの
抵抗値ｒは、ｒ＝ρ・２πe(1/D)／(d・D)となる。Here, when the pitch of the heating resistors is P, the thickness thereof is d, and the radius of the insulating layer 1 is e, the resistance value r per unit distance in the roll axis direction is r = ρ · 2πe (1 / D) / (d ・ D).
ここでＣを定数とすると抵抗値ｒ＝Ｃ／Ｄ２となりロー
ル軸方向の単位距離当りの抵抗値ｒは発熱抵抗体のピッ
チＰの二乗に反比例する。Here, when C is a constant, the resistance value r = C / D 2 , and the resistance value r per unit distance in the roll axis direction is inversely proportional to the square of the pitch P of the heating resistors.
従って、抵抗体２のピッチＰを、ロール１０の端部１０
ａのピッチＰ１を４mm，側部１０ｂのピッチＰ２を５m
m，中央部１０ｃのピッチＰ３を６mmにすると、上記関
係より抵抗値ｒの比は、端部１０ａを１とすると、側部
１０ｂは0.64，中央部１０ｃは0.44となる。Therefore, the pitch P of the resistor 2 is set to the end portion 10 of the roll 10.
The pitch P 1 of a is 4 mm and the pitch P 2 of the side portion 10 b is 5 m
When the pitch P 3 of m and the central portion 10c is set to 6 mm, the ratio of the resistance value r becomes 0.64 for the side portion 10b and 0.44 for the central portion 10c when the end portion 10a is 1 from the above relationship.
またジュールの法則により電流値をｉとすると、単位距
離当りの発熱量Ｗは、Ｗ＝ｉ２ｒとなり抵抗値ｒに比例
するため中央部１０Ｃより端部１０ａに向う程発熱量が
大となるので両端部１０ａ両側部１０ｂからの熱放散バ
ランスがとられ、結局ロール軸方向の表面温度分布は均
一となる。Further, if the current value is i according to Joule's law, the heat generation amount W per unit distance is W = i 2 r and is proportional to the resistance value r, so that the heat generation amount increases from the central portion 10C toward the end portion 10a. Therefore, the heat dissipation from both ends 10a and both sides 10b is balanced, and eventually the surface temperature distribution in the roll axis direction becomes uniform.
本実施例と従来例のロール表面温度分布を実験したとこ
ろ第８図のような結果を得た。即ち、従来例は、曲線Ｏ
となり、ロール端部１０ａと中央部１０ｃとでは、平均
約３０℃の温度差があるのに対し、本実施例では直線Ｎ
となり、ロール表面全体１０ａ〜１０ｃが２００℃均一
になった。When the roll surface temperature distributions of this example and the conventional example were tested, the results shown in FIG. 8 were obtained. That is, in the conventional example, the curve O
Therefore, there is an average temperature difference of about 30 ° C. between the roll end portion 10a and the central portion 10c, while the straight line N is present in this embodiment.
And the entire roll surface 10a to 10c became uniform at 200 ° C.
なお発熱抵抗体２への電流（電力）供給はヒートアップ
タイムまでは継続して行うが、その後は断続的に行って
も必要なロール表面温度を維持することができる。本実
施例において発熱抵抗体２の抵抗値を１０Ωにして１０
０Ｖ荷電した場合、消費電力は１ＫＷで、２００℃まで
のヒートアップタイムは１０秒間であり、従来例に比べ
そのタイムは大幅に短縮される。The current (electric power) is continuously supplied to the heating resistor 2 until the heat-up time, but after that, the required roll surface temperature can be maintained even if intermittently performed. In the present embodiment, the resistance value of the heating resistor 2 is set to 10Ω, and 10
When it is charged with 0 V, the power consumption is 1 KW and the heat-up time up to 200 ° C. is 10 seconds, which is significantly shorter than the conventional example.
帯状発熱抵抗体をねじ状に形成する方法として、ロール
の絶縁層の表面全体に抵抗材料をコーテングして抵抗膜
を形成し、この抵抗膜に螺旋状に溝を形成することも考
えられるが、この方法では隣り合う抵抗体の間を完全に
分離するために、溝を深めに、即ち、絶縁層にくい込む
程度に形成する必要がある。As a method of forming the strip-shaped heating resistor in a screw shape, it is possible to form a resistance film by coating a resistance material on the entire surface of the insulating layer of the roll, and form a spiral groove in the resistance film. In this method, in order to completely separate the adjacent resistors, it is necessary to form the groove deeply, that is, to the extent that the insulating layer is hard to fit.
そのため、その上に弗素樹脂をコーテングして付着防止
膜を形成するとその表面に凹凸が生じ平坦性が失われや
すい。Therefore, if a fluorine resin is coated thereon to form an anti-adhesion film, the surface of the film becomes uneven and flatness is likely to be lost.
そこで付着防止膜を一旦厚く形成した後、その表面を研
磨して平滑にしなければならないが、この研磨作業は、
多くの時間を必要とする上、高価な付着防止膜の材料を
削り捨てることになるので熱定着ロールのコストアップ
の原因となる。Therefore, it is necessary to temporarily form a thick anti-adhesion film and then polish the surface to make it smooth.
It takes a lot of time, and the material of the expensive anti-adhesion film is scraped away, which causes an increase in the cost of the heat fixing roll.
これに対し、前述のようにして発熱抵抗体を形成すると
その厚さｄを薄くすることができるので隣り合う抵抗体
２の間の溝Ｍは浅くなる。On the other hand, when the heating resistor is formed as described above, the thickness d can be reduced, so that the groove M between the adjacent resistors 2 becomes shallow.
従って、この上に弗素樹脂をコーテングして付着防止膜
３を形成するとその表面は自然に平坦な状態になりやす
く、前述のような研磨作業などの問題は生じない。Therefore, when a fluorine resin is coated on this to form the adhesion preventing film 3, the surface thereof tends to be naturally flat, and the above-mentioned problems such as polishing work do not occur.
実験によると、溝Ｍの幅ｍを500μｍ以下、例えば400μ
ｍにし、この上から弗素樹脂をコーテングして膜厚ｔ＝
50μｍ以下、例えば、40μｍの付着防止膜３を形成し、
付着防止に必要な表面平滑度をうるための研磨を施す
と、その表面は使用上支障のない程度の平滑面となっ
た。According to experiments, the width m of the groove M is 500 μm or less, for example 400 μm.
m, and coating with a fluororesin from above, film thickness t =
Forming an anti-adhesion film 3 of 50 μm or less, for example 40 μm,
When polishing was performed to obtain the surface smoothness necessary for preventing adhesion, the surface became a smooth surface that did not hinder the use.
他の実施例 この発明の実施例は、上記に限定されるものでなく、例
えば、帯状の発熱抵抗体を二重ねじ状に形成してもよ
い。Other Embodiments The embodiments of the present invention are not limited to the above, and for example, the strip-shaped heating resistor may be formed in a double screw shape.
この実施例を第４図〜第６図により説明するが、第１図
〜第３図と同一図面符号はその名称も機能も同一であ
る。This embodiment will be described with reference to FIGS. 4 to 6, and the same reference numerals as those in FIGS. 1 to 3 have the same names and functions.
第５図に示す様に絶縁層１の表面に金属線４を二重ねじ
状に巻き付け、その上からアルミロウなどを溶射し、発
熱抵抗体２を形成し、その後金属線４を除去すると、二
重ねじ状となり、第６図に示す様にロールの中央部１０
ｃから端部１０ａに向ってそのピッチＰ３，Ｐ２，Ｐ１
は順次小さくなる。この抵抗体２は第４図の如く、往路
用抵抗体２ａと復路用抵抗体２ｂとからなり、これらの
一端は結合部２ｃで電気的に連結されている。As shown in FIG. 5, a metal wire 4 is wound around the surface of the insulating layer 1 in a double-screw shape, and an aluminum solder or the like is sprayed on the metal wire 4 to form a heating resistor 2. After that, the metal wire 4 is removed. It becomes a heavy screw shape, and as shown in FIG.
The pitch P 3 , P 2 , P 1 from c toward the end 10a
Becomes smaller in sequence. As shown in FIG. 4, the resistor 2 includes a forward resistor 2a and a backward resistor 2b, one ends of which are electrically connected by a coupling portion 2c.
次にロール表面に付着防止膜３を形成すると共に、複写
機内の配線の簡素化を図るため、中空パイプＰ０の一端
に給電部６，７を設ける。そして給電部６に往路用抵抗
体２ａを接続し、又、給電部７に復路用抵抗体２ｂを接
続する。Next, the adhesion prevention film 3 is formed on the roll surface, and in order to simplify the wiring inside the copying machine, the power supply parts 6 and 7 are provided at one end of the hollow pipe P 0 . Then, the forward path resistor 2a is connected to the power supply section 6, and the return path resistor 2b is connected to the power supply section 7.
給電部６から往路用抵抗体２ａに電流を流すと、この電
流は、ジュール熱により抵抗体２ａを加熱すると共に、
その周囲に磁界を発生させながら矢印Ａ６方向に流れ、
抵抗体２ａの結合部２ｃに到達する。When a current is made to flow from the power feeding unit 6 to the outward resistor 2a, this current heats the resistor 2a by Joule heat and
Flowing in the direction of arrow A6 while generating a magnetic field around it,
The connecting portion 2c of the resistor 2a is reached.
そしてこの結合部２ｃに到達した電流は、ここで折り返
され復路用抵抗体２ｂに流れ前述と同様にジュール熱と
磁界を発生させながら矢印Ａ７方向に流れ給電部７に到
達する。Then, the current that has reached this coupling portion 2c is returned here and flows to the return path resistor 2b, and flows in the direction of arrow A7 while generating Joule heat and a magnetic field as before, and reaches the power feeding portion 7.
この際、往路用抵抗体２ａと復路用抵抗体２ｂとは、二
重ねじ状に形成されているので電流が互に逆向きにな
る。At this time, since the forward resistor 2a and the backward resistor 2b are formed in a double screw shape, the currents flow in opposite directions.
そのため抵抗体２ａの周囲の磁界と、抵抗体２ｂの周囲
の磁界とは、互にその磁界を打ち消し合うので、結局、
抵抗体２ａ，２ｂ即ち発熱抵抗体２の磁界はほとんど消
滅してしまう。ちなみに熱定着ロールの中空パイプ
Ｐ０，絶縁層１，および発熱抵抗体２から夫々２cm離れ
た場所の磁界の強さを測定したところ、一重ねじ状の帯
状発熱抵抗体の場合には、測定値の最高が9.3ガウス（G
auss）、次が7.2ガウスであったが、二重ねじ状の発熱
抵抗体の場合には、測定値の最高が0.4ガウスで、次が
0.2ガウスであり、二重ねじ状にすると著しく磁界の強
さが減少していることがわかった。Therefore, the magnetic field around the resistor 2a and the magnetic field around the resistor 2b cancel each other out.
The magnetic fields of the resistors 2a and 2b, that is, the heating resistor 2 almost disappear. By the way, when the strength of the magnetic field was measured at a distance of 2 cm from the hollow pipe P 0 of the heat-fixing roll, the insulating layer 1, and the heating resistor 2, the measured value was obtained in the case of a single-screw strip-shaped heating resistor. The highest of 9.3 gauss (G
auss), the next was 7.2 gauss, but in the case of a double screw-shaped heating resistor, the maximum measured value was 0.4 gauss and the next was
It was 0.2 Gauss, and it was found that the strength of the magnetic field was remarkably reduced when a double screw was used.
なお、この実施例においても熱定着ロール１０の中央部
１０ｃ，側部１０ｂ，端部１０ａの順に発熱抵抗体２
ａ，２ｂのピッチＰが狭くなっているのでロール表面温
度は前記実施例と同様その全長に亙って均一となること
は勿論である。Also in this embodiment, the heat generating resistor 2 is arranged in the order of the central portion 10c, the side portions 10b, and the end portions 10a of the heat fixing roll 10.
Since the pitch P of a and 2b is narrowed, the roll surface temperature is, of course, uniform over the entire length thereof as in the above embodiment.
前記実施例においては帯状の発熱抵抗体が直接付着防止
膜で覆われているが、第７図に示す様に帯状の発熱抵抗
体２の表面に絶縁膜１Ｎを形成し、その上に付着防止膜
３を形成してもよい。In the above embodiment, the strip-shaped heating resistor is directly covered with the anti-adhesion film, but as shown in FIG. 7, an insulating film 1N is formed on the surface of the strip-shaped heating resistor 2, and the anti-adhesion film is formed thereon. The film 3 may be formed.
このように発熱抵抗体２と付着防止膜３との間に絶縁膜
１Ｎを形成すると、付着防止膜３は丈夫になり又、その
表面が平坦となると共に電気的な安全性が向上する。When the insulating film 1N is formed between the heating resistor 2 and the anti-adhesion film 3 as described above, the anti-adhesion film 3 becomes strong, the surface thereof becomes flat, and the electrical safety is improved.
発明の効果 この発明は、以上のように帯状の発熱抵抗体が高発熱量
所用部分の幅を他の部分より狭い幅になしたので、該発
熱抵抗体の幅は、高発熱量所用部分即ちロールの両端部
では狭く、又、その他の部分即ちロールノ中央部では広
くなる。そのため、該発熱抵抗体のピッチは、ロールの
中央部から両端部に向かって徐々に小さくなるので、両
端部の抵抗値は中央部の抵抗値より大きくなる。EFFECTS OF THE INVENTION According to the present invention, as described above, the strip-shaped heating resistor has the width of the portion for high heating value narrower than that of the other portions. It is narrow at both ends of the roll and wide at the other part, that is, at the center of the roll. Therefore, the pitch of the heating resistors gradually decreases from the central portion of the roll toward both end portions, so that the resistance value at both end portions becomes larger than the resistance value at the central portion.
従って、ロールの中央部から端部に向う発熱量が大きく
なるので、両端部からの熱放散バランスがとられ、結局
ロールの軸方向の表面温度分布は第８図の直線Ｎのよう
になり、ロール表面全体が均一の温度となる。発熱抵抗
体は螺線状の溝により仕切られており、該溝はその全長
にわたって同一幅に形成されているので、発熱抵抗体の
幅を変化させるだけで簡単にしかも正確に発熱量の調整
をすることができる。Therefore, the amount of heat generated from the central portion of the roll toward the end portion is large, so that the heat dissipation from both end portions is balanced, and the surface temperature distribution in the axial direction of the roll is as shown by the straight line N in FIG. The temperature of the entire roll surface becomes uniform. The heating resistor is partitioned by a spiral groove, and the groove is formed to have the same width over its entire length. Therefore, the amount of heat generated can be adjusted easily and accurately simply by changing the width of the heating resistor. can do.
又、発熱抵抗体の抵抗値をロールの中央部から両端部に
向って徐々に小さくする際、単にねじ状発熱抵抗体のピ
ッチを徐々に小さくするだけですむので、その製作コス
トが従来例に比べ安価なものとなる。Also, when gradually decreasing the resistance value of the heating resistor from the central part of the roll toward both ends, it is only necessary to gradually reduce the pitch of the screw-shaped heating resistor, so the manufacturing cost is the same as the conventional example. It will be cheaper in comparison.
更に帯状の発熱抵抗体を二重ねじ状に形成し、その一端
を互に電気的に結合し、他端を夫々別の給電部に接続す
ると、給電部から発熱抵抗体に電流を供給した場合には
その電流は螺旋状に流れながらロール表面上を往復す
る。When a strip-shaped heating resistor is formed in the shape of a double screw, one ends of the heating resistors are electrically coupled to each other, and the other ends are connected to different power feeding parts, current is supplied from the power feeding part to the heating resistor. The current reciprocates on the roll surface while flowing in a spiral shape.
この時、電流の流れに伴い発生した磁界は互に打ち消し
合って消滅するので、熱定着ロールの表面上には磁界は
ほとんどなくなる。At this time, the magnetic fields generated by the current flow cancel each other out and disappear, so that there is almost no magnetic field on the surface of the heat fixing roll.
第１図〜第７図は、この発明の実施例を示す図で、第１
図は平面図、第２図は第１図のII−II線断面拡大図の一
部を示す図、第３図は発熱抵抗体の形成工程を示す図、
第４図は他の実施例を示す平面図、第５図は支持体に対
する金属線の巻き方を示す図、第６図は発熱抵抗体形成
後金属線を抜き取った状態を示す図、第７図は更に他の
実施例を示す断面図で第２図に相当する図、第８図はロ
ール表面の温度分布を示す図である。 １……絶縁層、２……発熱抵抗体 １０……熱定着ロール、Ｐ……ピッチ1 to 7 are views showing an embodiment of the present invention.
FIG. 2 is a plan view, FIG. 2 is a view showing a part of the enlarged sectional view taken along line II-II of FIG. 1, and FIG. 3 is a view showing a step of forming a heating resistor.
FIG. 4 is a plan view showing another embodiment, FIG. 5 is a view showing how to wind a metal wire around a support, and FIG. 6 is a view showing a state in which the metal wire is pulled out after the heating resistor is formed. FIG. 8 is a sectional view showing still another embodiment and corresponds to FIG. 2, and FIG. 8 is a view showing temperature distribution on the roll surface. 1 ... Insulating layer, 2 ... Heating resistor 10 ... Thermal fixing roll, P ... Pitch
───────────────────────────────────────────────────── フロントページの続き (72)発明者 柳田 建三 千葉県市川市北方３−13−15 (72)発明者 藤田 和憲 千葉県船橋市前原西６−３−１−302 (56)参考文献 特開 昭55−72390（ＪＰ，Ａ) 特開 昭57−29068（ＪＰ，Ａ) 特開 昭61−134776（ＪＰ，Ａ) 特開 昭59−102267（ＪＰ，Ａ) 特開 昭59−149385（ＪＰ，Ａ) 実開 昭60−74159（ＪＰ，Ｕ) 実開 昭60−128364（ＪＰ，Ｕ) 実開 昭57−30758（ＪＰ，Ｕ) 実開 昭59−9370（ＪＰ，Ｕ) 実開 昭62−16966（ＪＰ，Ｕ) 実公 昭58−48648（ＪＰ，Ｂ１) ─────────────────────────────────────────────────── ─── Continued Front Page (72) Inventor Kenzo Yanagida 3-13-15 Kitakata Ichikawa, Chiba Prefecture (72) Inventor Kazunori Fujita 6-3-1-302 Maebaru Nishi, Funabashi City, Chiba (56) References JP-A-55-72390 (JP, A) JP-A-57-29068 (JP, A) JP-A-61-134776 (JP, A) JP-A-59-102267 (JP, A) JP-A-59-149385 (JP, A) Actual opening Sho 60-74159 (JP, U) Actual opening Sho 60-128364 (JP, U) Actual opening Sho 57-30758 (JP, U) Actual opening Sho 59-9370 (JP, U) Actual Kai-sho 62-16966 (JP, U) Shoukou 58-48648 (JP, B1)
Claims (17)
溝により仕切って帯状の発熱抵抗体をねじ状に形成した
複写機用定着ロールであって、該溝はその全長にわたっ
て同一幅に形成されており、隣り合う溝同志の間隔は高
発熱量所要部分を他の部分より狭く形成され、該発熱抵
抗体の幅は高発熱量所要部分を他の部分より狭く形成さ
れたことを特徴とする複写機要熱定着ロール。1. A fixing roll for a copying machine, wherein a belt-shaped heating resistor is formed in a screw shape on a surface of a cylindrical insulating support member by partitioning with a spiral groove, and the groove extends over its entire length. The grooves are formed to have the same width, and the interval between adjacent grooves is formed so that a portion requiring a high heat generation amount is narrower than other portions, and a width of the heating resistor is formed so that a portion requiring a high heat generation amount is narrower than other portions. A heat-fixing roll for copying machines, which is characterized by
されていることを特徴とする特許請求の範囲第１項記載
の複写機熱定着ロール。2. A heat fixing roll for a copying machine according to claim 1, wherein the insulating support has an insulating layer formed on the surface thereof.
特許請求の範囲第２記載の複写機用熱定着ロール。3. The heat fixing roll for a copying machine according to claim 2, wherein the insulating layer has a thin film shape.
マ溶射により形成されることを特徴とする特許請求の範
囲第２項記載の複写機用熱定着ロール。4. The heat fixing roll for a copying machine according to claim 2, wherein the insulating layer is formed by plasma spraying of alumina or spinel.
端を互いに電気的に結合し、他端を夫々別の給電部に接
続したことを特徴とする特許請求の範囲第１項記載の複
写機用熱定着ロール。5. A strip-shaped heating resistor having a double screw shape, one end of which is electrically coupled to each other, and the other end of which is connected to a separate power feeding portion. Heat fixing roll for the copying machine described.
特徴とする特許請求の範囲第１項記載の複写機用熱定着
ロール。6. The heat fixing roll for a copying machine according to claim 1, wherein the strip-shaped heating resistor is a thin film.
り形成されることを特徴とする特許請求の範囲第１項記
載の複写機用熱定着ロール。7. The heat fixing roll for a copying machine according to claim 1, wherein the strip-shaped heat generating resistor is formed by thermal spraying of a resistance material.
溶射又はアーク溶射により形成されることを特徴とする
特許請求の範囲第１項記載の複写機用熱定着ロール。8. The heat fixing roll for a copying machine according to claim 1, wherein the strip-shaped heating resistor is formed by plasma spraying or arc spraying of a resistance material.
射することにより形成されることを特徴とする特許請求
の範囲第１項記載の複写機用熱定着ロール。9. The heat fixing roll for a copying machine according to claim 1, wherein the strip-shaped heat generating resistor is formed by spraying a resistance material with air.
周にマスキング線材を螺線状に巻き付け、その上に抵抗
材料を溶射し、その後該線材を除去することにより形成
されることを特徴とする特許請求の範囲第１項記載の複
写機用熱定着ロール。10. A strip-shaped heating resistor is formed by spirally winding a masking wire on the outer periphery of an insulating support, spraying a resistance material on the masking wire, and then removing the wire. A heat fixing roll for a copying machine according to claim 1.
線であることを特徴とする特許請求の範囲第１０項記載
の複写機用熱定着ロール。11. The heat fixing roll for a copying machine according to claim 10, wherein the masking material is an Invar wire or a copper wire.
ウであることを特徴とする特許請求の範囲第７項、第８
項又は第９項記載の複写機用熱定着ロール。12. The resistance material is aluminum or aluminum brazing, as claimed in claims 7 and 8.
Item 10. A heat fixing roll for a copying machine according to item 9 or 9.
れていることを特徴とする特許請求の範囲第１項記載の
複写機用熱定着ロール。13. A heat fixing roll for a copying machine according to claim 1, wherein the belt-shaped heat generating resistor is covered with an insulating film.
とを特徴とする特許請求の範囲第１３項記載の複写機用
熱定着ロール。14. The heat fixing roll for a copying machine according to claim 13, wherein the insulating film is covered with an adhesion preventing film.
れていることを特徴とする特許請求の範囲第１項記載の
複写機用熱定着ロール。15. The heat fixing roll for a copying machine according to claim 1, wherein the belt-shaped heat generating resistor is covered with an adhesion preventing film.
脂のコーテングにより形成されることを特徴とする特許
請求の範囲第１５項記載の複写機用熱定着ロール。16. The heat fixing roll for a copying machine according to claim 15, wherein the anti-adhesion film is formed of a coating of fluorine resin or silicon resin.
抵抗体溝を充填すると共に、その膜厚が５０μｍ以下で
あることを特徴とする特許請求の範囲第１５項記載の複
写機用熱定着ロール。17. The heat fixing device for a copying machine according to claim 15, wherein the anti-adhesion film fills the heating resistor groove having a width of 500 μm or less and the film thickness is 50 μm or less. roll.
Priority Applications (5)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61224333A JPH0636121B2 (en) | 1986-09-22 | 1986-09-22 | Heat fixing roll for copier |
| EP87308128A EP0262833B1 (en) | 1986-09-22 | 1987-09-15 | Thermal fixing roller for use in a copying machine and method for manufacturing the same |
| US07/096,735 US4743940A (en) | 1986-09-22 | 1987-09-15 | Thermal fixing roller for use in a copying machine and method for manufacturing the same |
| DE8787308128T DE3782224T2 (en) | 1986-09-22 | 1987-09-15 | HEAT-FIXING ROLLER FOR USE IN A COPIER AND METHOD FOR THE PRODUCTION THEREOF. |
| CA000547370A CA1269697A (en) | 1986-09-22 | 1987-09-21 | Thermal fixing roller for use in a copying machine and method for manufacturing the same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61224333A JPH0636121B2 (en) | 1986-09-22 | 1986-09-22 | Heat fixing roll for copier |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6378188A JPS6378188A (en) | 1988-04-08 |
| JPH0636121B2 true JPH0636121B2 (en) | 1994-05-11 |
Family
ID=16812112
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP61224333A Expired - Lifetime JPH0636121B2 (en) | 1986-09-22 | 1986-09-22 | Heat fixing roll for copier |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0636121B2 (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2691725B2 (en) * | 1988-04-18 | 1997-12-17 | 昭和電線電纜株式会社 | Heat fixing roller |
| IT1257082B (en) * | 1992-08-31 | 1996-01-05 | Olivetti Canon Ind Spa | HEATING DEVICE FOR THE FIXING OF INFORMATION ON AN INFORMATION SUPPORT OF DIFFERENT FORMATS. |
| JP5449990B2 (en) * | 2009-11-11 | 2014-03-19 | 日星電気株式会社 | Pressure roller |
| JP6652346B2 (en) | 2015-08-07 | 2020-02-19 | 住友電気工業株式会社 | Self-heating type fixing roller |
| JP6797562B2 (en) * | 2016-05-27 | 2020-12-09 | キヤノン株式会社 | A heating rotating body and an image heating device including the heating rotating body. |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5572390A (en) * | 1978-11-27 | 1980-05-31 | Tokyo Shibaura Electric Co | Heater |
| JPS5730758U (en) * | 1980-07-29 | 1982-02-18 | ||
| JPS5729068A (en) * | 1980-07-30 | 1982-02-16 | Fuji Xerox Co Ltd | Heating roll for fixing of electrophotographic copier |
| JPS5848648U (en) * | 1981-09-30 | 1983-04-01 | 昭和電線電纜株式会社 | Wide tape roll winding device |
| JPS599370U (en) * | 1982-07-09 | 1984-01-21 | キヤノン株式会社 | Fusing device |
| JPS59102267A (en) * | 1982-12-03 | 1984-06-13 | Hitachi Metals Ltd | Equalizing heat roll |
| JPS59149385A (en) * | 1983-02-17 | 1984-08-27 | Hitachi Metals Ltd | Heat fixing device |
| JPS6074159U (en) * | 1983-10-26 | 1985-05-24 | 京セラ株式会社 | heating fixing roller |
| JPS60128364U (en) * | 1984-02-07 | 1985-08-28 | 京セラ株式会社 | Heat fixing device |
| JPS61134776A (en) * | 1984-12-05 | 1986-06-21 | Hitachi Metals Ltd | Heat roll of copying machine |
| JPS6216966U (en) * | 1985-07-12 | 1987-01-31 |
-
1986
- 1986-09-22 JP JP61224333A patent/JPH0636121B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6378188A (en) | 1988-04-08 |
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