JPH07120120B2 - Offset prevention roller for electrophotographic fixing device - Google Patents
Offset prevention roller for electrophotographic fixing deviceInfo
- Publication number
- JPH07120120B2 JPH07120120B2 JP8621287A JP8621287A JPH07120120B2 JP H07120120 B2 JPH07120120 B2 JP H07120120B2 JP 8621287 A JP8621287 A JP 8621287A JP 8621287 A JP8621287 A JP 8621287A JP H07120120 B2 JPH07120120 B2 JP H07120120B2
- Authority
- JP
- Japan
- Prior art keywords
- oil
- layer
- roller
- paper
- fixing roller
- 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
Classifications
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
- G03G15/00—Apparatus for electrographic processes using a charge pattern
- G03G15/20—Apparatus for electrographic processes using a charge pattern for fixing, e.g. by using heat
- G03G15/2003—Apparatus for electrographic processes using a charge pattern for fixing, e.g. by using heat using heat
- G03G15/2014—Apparatus for electrographic processes using a charge pattern for fixing, e.g. by using heat using heat using contact heat
- G03G15/2017—Structural details of the fixing unit in general, e.g. cooling means, heat shielding means
- G03G15/2025—Structural details of the fixing unit in general, e.g. cooling means, heat shielding means with special means for lubricating and/or cleaning the fixing unit, e.g. applying offset preventing fluid
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Fixing For Electrophotography (AREA)
- Coating Apparatus (AREA)
Description
【発明の詳細な説明】 (発明の目的) この発明はオイル含浸層を有していて、このオイル含浸
層により電子複写機その他電子写真装置の定着ローラー
にシリコーン油のようなオフセット防止用オイルを供給
するとともに定着ローラー面に残留する印像のトナーを
除去するために使用するローラーに関するもので、前記
定着ローラーのオフセット防止能力並びにこの定着ロー
ラーに対するクリーニング能力を向上させるとともに、
この定着ローラーのこれらの能力を長期間にわたって持
続させ、あわせてオフセット防止ローラーの保存性を向
上させる手段を提供するのがその目的である。DETAILED DESCRIPTION OF THE INVENTION (Object of the Invention) The present invention has an oil-impregnated layer, and this oil-impregnated layer provides an offset preventing oil such as silicone oil to a fixing roller of an electronic copying machine or other electrophotographic apparatus. The present invention relates to a roller used to remove the toner of the image printed on the surface of the fixing roller while being supplied, and improve the offset preventing ability of the fixing roller and the cleaning ability for the fixing roller.
It is an object of the present invention to provide a means for maintaining these capabilities of the fixing roller for a long period of time and also improving the storage stability of the offset prevention roller.
中空の心体の周壁にオイル含浸層が被覆されており、前
記周壁に分散して穿った通孔およびオイル含浸層を通
じ、心体に収容したオフセット防止オイル(以下単にオ
イルという)を第3図に示すような定着装置の定着ロー
ラーK1またはK2に供給するとともに定着ローラーの残留
トナーを除去するオフセット防止ローラー(第3図にS
で示す)は、たとえばこの発明者が開示した特開昭60-1
36782号公報などで公知である。そして、このようなオ
フセット防止ローラーは、貯油タンクから導かれたオイ
ルをフェルト等の塗布装置で定着ローラーに供給する従
来のオフセット防止手段を著しく小型化できるため、電
子写真装置全体の小型化並びに経済性の向上に多大の寄
与をしている。The oil-impregnated layer is coated on the peripheral wall of the hollow core body, and the offset prevention oil (hereinafter simply referred to as oil) accommodated in the core body is passed through the through holes and the oil-impregnated layer formed in the peripheral wall in a distributed manner. An offset prevention roller that supplies residual toner to the fixing roller K 1 or K 2 of the fixing device as shown in FIG.
Is shown in Japanese Patent Laid-Open No. 60-1 disclosed by the inventor.
It is known from Japanese Patent No. 36782. Further, such an offset prevention roller can significantly reduce the size of the conventional offset prevention means for supplying the oil guided from the oil storage tank to the fixing roller with a coating device such as a felt, so that the overall size and economy of the electrophotographic apparatus can be reduced. It greatly contributes to the improvement of sex.
しかしながら、このようなオフセット防止ローラーにも
つぎのような欠点があることが次第に判明した。即ち、
前記したオフセット防止ローラーは電子写真装置に組込
まれ、または単体として倉庫保管や一般の輸送、特に輸
出時の船倉輸送が長期間にわたると、心体内からオイル
含浸層へオイルの絶え間ない浸出のため、オイル含浸層
のオイル蓄積が過剰となり、その使用時において用紙を
オイルによって著しく汚染するようになるのである。However, it has been gradually found that such an offset prevention roller also has the following drawbacks. That is,
The above-mentioned offset prevention roller is incorporated in an electrophotographic apparatus, or as a single unit for warehouse storage and general transportation, especially for long-term shipment transportation during shipping, because of continuous leaching of oil from the body into the oil-impregnated layer, Excessive oil accumulation in the oil impregnated layer causes the paper to be significantly contaminated with oil during its use.
つぎに、前記したオフセット防止ローラーの第二の欠点
として、これを装着した定着ローラーへの通紙の初期に
おいてオイルがオフセット防止ローラーのローラー面に
一様に分布して含浸されていても、連続通紙枚数が多く
なると分布の一様性を失い、第8図に示すようなオイル
汚れの分布パターンが発生するに至る。即ち、ハン点14
の区域に関してはオイルの供給量が充分であるためこの
区域に多量にトナーを吸着しているのに対し、斜線で示
すその他の区域におけるオイル供給が不充分なため結局
は定着ローラーのローラー面に対するクリーニング効果
が急速に低下し、オイル供給ローラーの全面がトナーで
飽和するよりもはるか以前において用紙へのオフセット
が顕著化するのである。Next, as a second drawback of the offset prevention roller described above, even if the oil is uniformly distributed and impregnated on the roller surface of the offset prevention roller at the initial stage of paper passing to the fixing roller equipped with this, continuous As the number of sheets passed increases, the distribution becomes less uniform, leading to the distribution pattern of oil stains as shown in FIG. That is, 14 points
As for the area (1), a large amount of oil is adsorbed in this area because the toner is adsorbed in a large amount in this area, while the oil supply in other areas indicated by the shaded areas is insufficient, and eventually the roller surface of the fixing roller is The cleaning effect rapidly decreases, and the offset to the paper becomes noticeable long before the entire surface of the oil supply roller is saturated with the toner.
単層のオイル含浸層をもつ従来のオイル供給ローラーに
おける上記のような欠点に対処し、最近特開昭60-14477
8号公報および実開昭61-104469号公報に掲載されている
ように、オイル含浸層をオイルの通過性あるいは保留性
がたがいに異なる複数層に構成することにより、オイル
の浸出量に制限を加えるなどの工夫が提案されている。The above-mentioned drawbacks of the conventional oil supply roller having a single-layer oil impregnated layer have been dealt with in recent years by the Japanese Patent Laid-Open No.
As disclosed in Japanese Patent Publication No. 8 and Japanese Utility Model Publication No. 61-104469, by limiting the oil leaching amount by configuring the oil-impregnated layer into multiple layers that differ in oil permeability or retention. Ideas such as additions have been proposed.
即ち、実開昭61-104469号にかかる実施例によれば、オ
イル含浸層を3層に構成し、内層は繊維密度の低い紙
(7巻き)、中間層は繊維密度の高い紙(2巻き)、表
層は繊維密度をポリアミド繊維フェルト(厚さ1mm)と
し、特に中間層のオイル通過性を不良にして表層へのオ
イル転移量を制限しようとはかっている。That is, according to the example of Japanese Utility Model Laid-Open No. 61-104469, the oil-impregnated layer is composed of three layers, the inner layer is paper with low fiber density (7 rolls), and the intermediate layer is paper with high fiber density (2 rolls). ), The surface layer has a fiber density of polyamide fiber felt (thickness 1 mm), and attempts to limit the oil transfer amount to the surface layer by making the oil permeability of the intermediate layer poor.
一方、特開昭60-144778号に開示された実施例に従え
ば、オイル含浸層を厚さ0.4mmの繊維質シートからなる
内層と、厚さ4mmのシリコーンゴムスポンジからなる表
層との2層で構成し、特にシリコーンゴムスポンジの連
続気泡率を適当に設定することにより、このシリコーン
ゴムスポンジの表面に該当するローラー面へのオイル移
動量を制限しようとしている。On the other hand, according to the embodiment disclosed in JP-A-60-144778, the oil-impregnated layer has two layers, an inner layer made of a fibrous sheet having a thickness of 0.4 mm and a surface layer made of a silicone rubber sponge having a thickness of 4 mm. It is intended to limit the amount of oil transfer to the roller surface corresponding to the surface of the silicone rubber sponge by appropriately setting the open cell rate of the silicone rubber sponge.
しかしながら、この発明者の実験によれば、前者(実開
昭61-104469号)のローラーを装着した定着ローラーに
連続通紙した場合、後記するこの発明の実施例に対する
対照例からも明らかなように、オイル供給ローラーのロ
ーラー面におけるオイルの分布にむらがあるのみなら
ず、このローラーを約3箇月室温で放置した後は、表層
におけるオイルの含浸量があらかじめ含浸しておいた量
のほぼ2倍に、6箇月放置後においてはほぼ5倍に達
し、そのままでは定着ローラーに装着使用するに耐えな
い状態に至るのである。このような事実は、もっぱら繊
維間におけるオイル浸透拡散性を利用する限りは、層を
複数に構成しかつ各層の密度をかえても、通紙中の定着
ローラー面へのオイル分布性を改善し、かつ長期間放置
後の表層におけるオイルの過剰蓄積を防止できないこと
を示している。However, according to the experiments by the inventor, when the former (actually developed No. Sho 61-104469) fixing roller equipped with rollers is continuously fed, it is apparent from the control example to the embodiment of the present invention described later. In addition to the uneven distribution of oil on the roller surface of the oil supply roller, after the roller was left at room temperature for about 3 months, the amount of oil impregnated in the surface layer was almost 2% of the amount previously impregnated. That is, after being left for 6 months, it almost reaches 5 times, and when it is left as it is, the fixing roller cannot be mounted and used. This fact improves the oil distribution to the surface of the fixing roller during paper feeding, even if a plurality of layers are formed and the density of each layer is changed, as long as the oil permeation diffusivity between fibers is utilized. It also indicates that it is not possible to prevent excessive accumulation of oil in the surface layer after being left for a long time.
また、後者(特開昭60-144778)の場合は、スポンジゴ
ム層内のオイル拡散性が繊維層と較べて著しく低いとこ
ろから、長期間放置後における表層のオイル過剰蓄積の
問題は発生しないのであるが、オイル拡散性が不良なこ
とに起因し、後記するように定着ローラーへの連続通紙
を行う使用時においてはローラー面におけるオイルの分
布状態が同様に悪く、そのため定着ローラーに対するオ
イル供給ムラが著しいうえにスポンジの弾性物質自体の
トナー吸着性が繊維よりも格段に劣り、またトナーを補
足すべき気孔がトナーの粒子より著しく大きいところか
ら定着ローラーに対するクリーニング作用が不完全であ
るのみならず、気孔に用紙の紙粉が詰まってローラー面
へのオイル浸出が阻害される欠点がある。さらにそのう
え、定着ローラーは使用中180〜220℃もの高温状態で使
用されるのに対し、そのような高温に対して耐久性のあ
る弾性物質のスポンジが得られず、従って、急速な劣化
をみるので長期間の使用に耐えないことは全く致命的で
あるといえる。In the latter case (JP-A-60-144778), since the oil diffusivity in the sponge rubber layer is significantly lower than that in the fiber layer, the problem of excessive oil accumulation in the surface layer after being left for a long time does not occur. However, due to the poor oil diffusivity, the distribution of oil on the roller surface is similarly poor during continuous paper feeding to the fixing roller, as described below. In addition to the fact that the sponge elastic material itself is much inferior in toner adsorbability to the fiber and the pores to be supplemented with the toner are significantly larger than the toner particles, not only the cleaning action on the fixing roller is incomplete. However, there is a drawback in that the pores are clogged with paper dust, which prevents the oil from leaching to the roller surface. Furthermore, while the fixing roller is used at a high temperature as high as 180 to 220 ° C. during use, a sponge of an elastic material that is durable to such a high temperature cannot be obtained, and therefore, it shows rapid deterioration. Therefore, it cannot be said that it cannot withstand long-term use.
従ってこの発明は、定着ローラーに装着してこれにオイ
ルを供給するとともにそのローラー面に残留するトナー
の除去を行うオフセット防止ローラーの上記したような
従来の欠点を解消するのがその目的で、下記のように構
成されている。Therefore, the present invention aims to eliminate the above-mentioned conventional drawbacks of the offset prevention roller which is mounted on the fixing roller, supplies oil to the fixing roller, and removes the toner remaining on the roller surface. It is configured like.
(発明の構成) 以下、この発明の一実施例の断面を示す第1図、第2図
および第4図を参照してこの発明を説明すれば、1はオ
フセット防止オイルAを収容する中空の心体で、素材と
して鉄、アルミニウムなどの金属や適当なエンジニヤリ
ングプラスチックを使用する。心体の筒壁11にはたとえ
ば孔径0.3〜1.5mmのような通孔12を分散して穿つ。2は
オイル含浸層を示し、高密度の繊維層からなる内層21と
低密度の繊維層からなる表層23の間に耐熱弾性スポンジ
からなる中間層22が介装されている。内層21の繊維層に
は0.5〜1.0g/cm3のように高密度のものを用い、ポリア
ミド紙や和紙などを数周巻いて形成するのがよい。中間
層22にはシリコーンゴム、フッ素ゴムなどの耐熱弾性ス
ポンジで連泡率は低い方が好適であり、厚さは0.5〜3.0
mm程度とするのがよい。表層23を形成する繊維層の素材
には0.2〜0.4g/cm3のように低密度で組織の粗いポリア
ミドフェルトが最適である。なお、心体1に収容するオ
イルAとしては3万〜50万c.s.のような高粘度のシリコ
ーンオイルが最適で、通常心体の内容積の80%以下の量
を封入するのがよい。(Structure of the Invention) The present invention will be described below with reference to FIGS. 1, 2, and 4 showing cross sections of an embodiment of the present invention. Use metal such as iron or aluminum or a suitable engineering plastic as the material for the body. On the cylindrical wall 11 of the core body, through holes 12 having a hole diameter of 0.3 to 1.5 mm are dispersedly formed. Reference numeral 2 denotes an oil-impregnated layer, in which an intermediate layer 22 made of a heat-resistant elastic sponge is interposed between an inner layer 21 made of a high-density fiber layer and a surface layer 23 made of a low-density fiber layer. For the fiber layer of the inner layer 21, it is preferable to use one having a high density such as 0.5 to 1.0 g / cm 3 , and to form it by winding polyamide paper, Japanese paper, or the like several times. The middle layer 22 is preferably made of a heat-resistant elastic sponge such as silicone rubber or fluororubber and has a low open cell rate and a thickness of 0.5 to 3.0.
It is good to set it to about mm. As a material for the fiber layer forming the surface layer 23, a polyamide felt having a low density and a coarse texture such as 0.2 to 0.4 g / cm 3 is optimal. In addition, as the oil A to be contained in the core body 1, a highly viscous silicone oil such as 30,000 to 500,000 cs is most suitable, and usually 80% or less of the inner volume of the core body should be enclosed.
この発明は前記のようにしてなるのであるが、定着ロー
ラーに装着して使用する際は、通紙の最初から定着ロー
ラーに適量のオイルを用紙の全面にむらなく供給できる
ようにするため、このオフセット防止ローラーのローラ
ー面にあらかじめ少量のオイルを一様に分布塗布してお
く。The present invention is configured as described above, but when it is mounted on the fixing roller and used, in order to supply an appropriate amount of oil to the fixing roller evenly from the beginning of paper feeding, Apply a small amount of oil evenly on the roller surface of the offset prevention roller in advance.
以下第4図を用いてこの発明の作用を説明するが、この
図は下位にある定着ローラーK1に対してこの発明にかか
るオフセット防止ローラーSが上方から当接している場
合、その当接している筒壁部の要部の断層の態様をあら
わしている。The operation of the present invention will be described below with reference to FIG. 4. This figure shows that when the offset prevention roller S according to the present invention is in contact with the lower fixing roller K 1 from above, It shows the aspect of the fault of the main part of the tubular wall part.
即ち、定着ローラーK1の加熱を受けて粘度の低下したオ
イルAは通孔12をへて表層23に向って浸透拡散して行く
が、まず内層21を形成する密度の高い繊維層において流
量が規制されつつ狭い漏斗状に拡散するが、スポンジゴ
ムによって形成されている中間層22はその気孔以外の点
では浸透し難いので、内層21と中間層22との境界面3に
沿い、その面のなす方向に図示のように著しく広がる。
中間層22のスポンジゴムは自然放置の状態では浸透し難
くはあるが、オフセット防止ローラーSは定着ローラー
K1に圧接されつつ回転するので、その加圧を受ける周面
の位置が刻々変化するため、スポンジゴムの気孔は圧
縮、開放を繰返し、ここに一種のポンプ作用が行われ
る。ただし、このポンプ作用はオイルの通過距離の小さ
い厚さの方向にはよく働き、オイルを表層23によく送り
出すのであるが、通過距離が層の厚さと較べて比較にな
らないほど大きく、従って通過抵抗の大である層に沿う
方向に対してはよく働かないため、オイルは層に沿う方
向にはあまり拡散浸透しないので、たがいに離れて隣り
合う2個の通孔12,12の中間に対応する中間層22の中間
部13はオイルの含浸がほとんどないか、あるいは著しく
含浸が不良な状態で残る。しかしながら、この発明によ
れば、このような中間層22が浸透性のきわめて良好な低
密度の繊維層からなる表層23に接しているので、中間層
22において含浸状態の良好なかなり広い部分から送り出
されるオイルは表層23に転移するのと同時に表層23内で
層に沿う方向に拡散し、その結果定着ローラーK1に圧接
される表層23の表層付近にはオイルが一様に分布し、定
着ローラーK1のローラー面にむらなく供給される。な
お、前記したように、中間層22を構成するスポンジゴム
層においてオイルの含浸が不良な区域が広く残ること
は、後述する対照例のローラーの表面が定着ローラーへ
の多数回の通紙後において第8図に示すトナーハン点状
の態様を呈するに至ったことにより確認された。That is, the oil A whose viscosity has been lowered by the heating of the fixing roller K 1 permeates and diffuses toward the surface layer 23 through the through holes 12, but first, the flow rate is increased in the dense fiber layer forming the inner layer 21. Although it diffuses in a narrow funnel shape while being regulated, since the intermediate layer 22 formed of sponge rubber is difficult to permeate at points other than its pores, it follows the boundary surface 3 between the inner layer 21 and the intermediate layer 22 and It spreads significantly as shown in the drawing.
Although the sponge rubber of the mid layer 22 is difficult to permeate in a state of being left naturally, the offset prevention roller S is a fixing roller.
Since it rotates while being pressed against K 1 , the position of the peripheral surface receiving the pressure changes every moment, so the pores of the sponge rubber are repeatedly compressed and opened, and a kind of pump action is performed here. However, this pumping action works well in the direction of the thickness where the oil passage distance is small and sends the oil well to the surface layer 23, but the passage distance is incomparably larger than the layer thickness, and therefore the passage resistance is large. Since it does not work well in the direction along the layer that is large, the oil does not diffuse and penetrate in the direction along the layer so much that it corresponds to the middle of two through holes 12, 12 adjacent to each other. The intermediate portion 13 of the intermediate layer 22 is hardly impregnated with oil, or remains impregnated significantly. However, according to the present invention, since such an intermediate layer 22 is in contact with the surface layer 23 composed of a low-density fiber layer having extremely excellent permeability, the intermediate layer 22
The oil sent out from a fairly wide portion with a good impregnation state at 22 is transferred to the surface layer 23 and at the same time diffused in the direction along the layer in the surface layer 23, and as a result, near the surface layer of the surface layer 23 pressed against the fixing roller K 1. Oil is evenly distributed on the roller and is evenly supplied to the roller surface of the fixing roller K 1 . Incidentally, as described above, in the sponge rubber layer constituting the intermediate layer 22, a region where the impregnation of oil is poor remains broadly because the surface of the roller of the control example described later is passed through the fixing roller many times. This was confirmed by the fact that the toner dot-like state shown in FIG. 8 was exhibited.
つぎに、保管、輸送のためこの発明にかかるローラーを
長期間放置した場合、内層21、中間層22を介して心体1
内のオイルAが浸出し、表層23に転移蓄積されるけれど
も、中間層22を構成するスポンジゴム層は自然状態では
オイルが通過し難いため、第10図における実施例の特性
線からわかるようにその転移蓄積量は僅少であり、従っ
て、長期間放置後のローラーを定着ローラーに装着して
使用しても用紙のオイル汚れは発生せず、当初から定着
ローラーへの適当量のオイル供給能力を発揮することが
できる。Next, when the roller according to the present invention is left for a long period of time for storage and transportation, the core body 1 is inserted through the inner layer 21 and the intermediate layer 22.
Although the oil A in the inside leaches out and is transferred and accumulated in the surface layer 23, the sponge rubber layer forming the intermediate layer 22 is difficult for oil to pass through in the natural state, so as can be seen from the characteristic line of the embodiment in FIG. The amount of transfer accumulation is very small, so even if the roller is left on the fixing roller for a long period of time and used, oil stains on the paper do not occur, and an appropriate amount of oil supply capacity to the fixing roller is maintained from the beginning. Can be demonstrated.
さらに、この発明によれば、内層21の密度の高い繊維層
はオイル通過に対する規制作用を呈するのであるが、中
間層22のスポンジ層はそのような高密度繊維層よりも一
層顕著なオイル規制作用を有することは前記した通りな
ので、オイルの無駄な消費を防止し、従って長期のオイ
ル供給寿命を確保することができる。Further, according to the present invention, the high-density fiber layer of the inner layer 21 exerts a regulation effect on oil passage, but the sponge layer of the intermediate layer 22 has a more remarkable oil regulation action than such a high-density fiber layer. As described above, the wasteful consumption of oil can be prevented, and a long oil supply life can be secured.
さらにまた、この発明によれば、表層23と内層21との間
にスポンジゴムの中間層22が介在しているので、このス
ポンジゴム層の軟弾性に起因し、定着ローラーK1に当接
する表層23の変形による充分なニップ幅が確保され、そ
のため、表層23による良好なクリーニング作用が発揮さ
れる。Furthermore, according to the present invention, since the intermediate layer 22 of sponge rubber is interposed between the surface layer 23 and the inner layer 21, due to the soft elasticity of the sponge rubber layer, the surface layer that contacts the fixing roller K 1. A sufficient nip width is ensured by the deformation of 23, and therefore, the surface layer 23 exhibits a good cleaning action.
なおまた、軟弾性のスポンジは耐熱性が繊維よりも劣
り、高温による劣化が比較的速やかであるが、この発明
によればこのようなスポンジ層は高温の定着ローラーに
直接当接せず、表層23の繊維層の保護を受けるため、劣
化の進行が緩和で、定着装置に要求されるだけの長期間
前記したオフセット防止能力を維持することができる。Further, the soft elastic sponge is inferior in heat resistance to the fiber and is relatively quickly deteriorated by high temperature. However, according to the present invention, such sponge layer does not directly contact the high temperature fixing roller and the surface layer Since the 23 fibrous layers are protected, the progress of deterioration is alleviated, and the above-mentioned offset prevention capability required for the fixing device can be maintained for a long period of time.
以下はこの発明の一実施例の成績を従来技術にかかる数
個の対照例の実験成績と対比して記載する。The results of one embodiment of the present invention are described below in comparison with the experimental results of several conventional control examples.
(実施例) 第1図および第2図を参照すれば、1はアルミニウム製
中空筒状の心体で、内径22mm、外径24mm、面長320mmで
支持用の支軸15,15をそなえる。筒壁11には直径1mmの通
孔12が40個分散配設されている。オイル含浸層2は内層
21、中間層22、表層23からなり、内層21は厚さ0.1mm、
繊維密度0.6g/cm3のポリアミド紙(呉羽センイ(株)製
ノーメックスペーパーNX-6060)を5周巻回してなって
いる。中間層22は厚さ1mm、アスカー硬度30度のシリコ
ーンスポンジゴムからなる。表層23は厚さ1.5mm、繊維
密度0.32g/cm3のポリアミドフェルト(呉羽センイ
(株)製ノーメックスフェルト)からなっている。心体
1の内部にはオイルAとして粘度30万c.s.のシリコーン
オイル(トーレ・シリコーン(株)製SH-200)80gを封
入してある。(Embodiment) Referring to FIG. 1 and FIG. 2, reference numeral 1 is a hollow aluminum-made core body having an inner diameter of 22 mm, an outer diameter of 24 mm and a surface length of 320 mm, and supporting shafts 15 and 15 for supporting. Forty through holes 12 having a diameter of 1 mm are dispersedly arranged in the cylinder wall 11. Oil impregnated layer 2 is the inner layer
21, the intermediate layer 22, the surface layer 23, the inner layer 21 has a thickness of 0.1 mm,
A polyamide paper (Nomex paper NX-6060 manufactured by Kureha Senii Co., Ltd.) having a fiber density of 0.6 g / cm 3 is wound five times. The intermediate layer 22 is made of silicone sponge rubber having a thickness of 1 mm and an Asker hardness of 30 degrees. The surface layer 23 is made of polyamide felt (Nomex felt manufactured by Kureha Senii Co., Ltd.) having a thickness of 1.5 mm and a fiber density of 0.32 g / cm 3 . 80 g of silicone oil (SH-200 manufactured by Toray Silicone Co., Ltd.) having a viscosity of 300,000 cs is enclosed as the oil A inside the core body 1.
以下の各対照例は簡単のため図示を省略したので、上記
実施例を図解した第1図および第2図を参照されたい。
なおこれらの対照例については実施例と同一の部分はこ
れと同一の符号で表示する。For the sake of simplicity, the following comparative examples are not shown, so please refer to FIG. 1 and FIG. 2 which illustrate the above embodiment.
In these comparative examples, the same parts as those in the examples are denoted by the same reference numerals.
(対照例1) 前記実施例と同一の心体1の周面上に内層21として前記
実施例と同一のポリアミド紙を前記実施例と同じく5回
巻回し、この内層21の上に前記実施例と同一のポリアミ
ドフェルト層を設けて表層23とした。中間層22は設けな
いのでオイル含浸層2は2層で構成されている。オイル
Aは実施例のものと同質同量である。(Comparative Example 1) The same polyamide paper as the above-mentioned example was wound around the same peripheral surface of the core body 1 as the above-mentioned example as the inner layer 21 five times as in the above-mentioned example, and the above-mentioned example was formed on this inner layer 21. The same polyamide felt layer as above was provided as the surface layer 23. Since the intermediate layer 22 is not provided, the oil impregnated layer 2 is composed of two layers. Oil A is of the same quality and amount as in the example.
(対照例2) 前記実施例と同一の心体1上に内層21として繊維密度0.
45g/cm3の和紙を巻回して層の厚さを1.0mmとし、中間層
22として繊維密度0.8g/cm3のポリアミド紙(呉羽センイ
(株)製ノーメックスペーパー)を厚さ0.5mmとなるよ
うに巻回し、その上に表層23として前記実施例と同一材
質、同一厚さのポリアミドフェルト層を設けた。オイル
Aは前記実施例と同質同量である。(Comparative Example 2) A fiber density of 0.
Wrap 45g / cm 3 Washi paper to a layer thickness of 1.0mm.
As 22 a polyamide paper having a fiber density of 0.8 g / cm 3 (Nomex paper manufactured by Kureha Senii Co., Ltd.) was wound to have a thickness of 0.5 mm, and as the surface layer 23 thereon, the same material and the same thickness as those in the above-mentioned Examples were used. Of the polyamide felt layer. Oil A is of the same quality and amount as in the above-mentioned embodiment.
(対照例3) 心体1はアルミニウム製中空筒状で、内径17mm、外径19
mm、面長320mmで、通孔12(直径1mm)の数は16個であ
る。内層21は繊維密度0.4g/cm3のポリアミド紙(呉羽セ
ンイ(株)製ノーメックスペーパー)を厚さ0.5mmとな
るように巻回し、この内層21の上に表層23として厚さ4m
m、硬度30度のシリコーンスポンジゴム層を設けた。中
間層22はない。心体1に収容したオイルAは前記実施例
1と同質で50gである。(Comparative Example 3) The core body 1 is a hollow cylinder made of aluminum and has an inner diameter of 17 mm and an outer diameter of 19 mm.
mm, surface length 320 mm, and the number of through holes 12 (diameter 1 mm) is 16. The inner layer 21 is formed by winding polyamide paper with a fiber density of 0.4 g / cm 3 (Nomex paper manufactured by Kureha Senii Co., Ltd.) to a thickness of 0.5 mm, and a thickness of 4 m as a surface layer 23 on the inner layer 21.
A silicone sponge rubber layer having m and a hardness of 30 degrees was provided. There is no intermediate layer 22. The oil A contained in the core body 1 is of the same quality as in Example 1 and is 50 g.
ここで、前記した実施例と各対照例の試験方法および試
験成績を述べる。Here, the test methods and test results of the above-mentioned examples and control examples will be described.
まず、定着ローラーに対するオイル供給ムラの有無を調
べるため、実施例および各対照例を同一の電子複写機に
組込み、各1万枚の通紙試験を行った。1万枚の通紙の
後オフセット防止ローラーを取外してローラー面を観察
すると、実施例のローラー面はその全周面に均等な濃度
でトナー汚れが発生しているのに対し、対照例1〜3の
ローラー面は何れもほぼ第8図に示すような、即ち心体
に設けた通孔12に対応する位置を中心としてトナー汚れ
による濃厚なハン点15が発生しており、これらのハン点
15相互の中間にはトナー汚れは非常に微弱である。この
ことは、実施例においては第4図のように、表層23の表
面近くのオイル含浸の態様がほぼ一様であって、そのた
めローラー面の全体がトナーを均等に吸着するのに対
し、対照例1についてはオイル含浸層2が複層でありな
がら、各層がすべて浸透性の良好な繊維層によって形成
されているため、通孔12から供給されるオイルが側方に
拡散するよりはローラー面に向ってほぼ直進的に浸透す
るためであると推定された。第5図は対照例1のオイル
含浸層2におけるオイル浸透のパターンを示すものであ
る。この事情は第6図に示した対照例2におけるオイル
浸透のパターンについても同様であって、オイル含浸層
2を繊維密度の違う3層に構成しても、得られる結果は
複層の場合と大差はない。また、対照例3におけるオイ
ル浸透のパターンを第7図に示したが、2層に構成され
たオイル含浸層2の表層23がオイル浸透性の劣るスポン
ジゴムで形成されているため、内層21から浸出しようと
するオイルは表層23の方向への移動が阻害されるので表
層23との境界面において面の方向に拡散し、その境界面
においては通孔12の断面積に比して著しく広い拡散面16
を形成する。かくして、オイルはこのような広い拡散面
16を起点として表層23に浸透を開始するのであるが、表
層23のスポンジゴムは側方への拡散性に乏しいので表層
23の表面であるローラー面に至る間において大した広が
りを見せず、結局はオイル供給ムラに起因し、第8図に
示すハン点15のようなトナー汚れを呈するに至るのであ
る。First, in order to examine the presence or absence of uneven oil supply to the fixing roller, the example and each control example were incorporated in the same electronic copying machine, and a paper passing test was performed on 10,000 sheets each. When the offset preventing roller was removed after 10,000 sheets of paper had passed and the roller surface was observed, toner smear occurred in the roller surface of the example at a uniform density on the entire peripheral surface, while in Comparative Examples 1 to As shown in FIG. 8, the roller surface of No. 3 has a thick hang point 15 due to the toner stain around the position corresponding to the through hole 12 provided in the core body.
15 In the middle of each other, the toner stain is very weak. This is because in the embodiment, as shown in FIG. 4, the manner of oil impregnation near the surface of the surface layer 23 is almost uniform, and therefore the entire roller surface adsorbs toner evenly, whereas the contrast is in contrast. In Example 1, since the oil-impregnated layer 2 is a multi-layer, all the layers are formed by the fiber layer having good permeability, so that the oil supplied from the through holes 12 is not laterally diffused but the roller surface. It was presumed that this was because it permeated almost straight toward. FIG. 5 shows an oil permeation pattern in the oil-impregnated layer 2 of Comparative Example 1. This situation is the same for the oil permeation pattern in Comparative Example 2 shown in FIG. 6, and even if the oil-impregnated layer 2 is composed of three layers having different fiber densities, the results obtained are the same as those of the multi-layer structure. There is no big difference. Further, the oil permeation pattern in Comparative Example 3 is shown in FIG. 7, but since the surface layer 23 of the oil impregnated layer 2 composed of two layers is formed of sponge rubber having poor oil permeability, Since the oil to be leached is prevented from moving in the direction of the surface layer 23, it diffuses in the surface direction at the boundary surface with the surface layer 23, and at the boundary surface, the diffusion is significantly wider than the cross-sectional area of the through hole 12. Face 16
To form. Thus, oil has such a wide diffusion surface.
It starts to permeate into the surface layer 23 starting from 16, but since the sponge rubber of the surface layer 23 has poor lateral diffusion,
The roller surface, which is the surface of No. 23, does not show a great spread, and eventually, due to the uneven oil supply, toner stain such as a point 15 shown in FIG. 8 is exhibited.
定着ローラーへの通紙におけるオフセットの発生は主と
して定着ローラーへのオイル供給ムラに起因するのであ
るが、前記した実施例および各対照例のローラーを定着
ローラーに装着して通紙試験を行ったところ、実施例で
は約15万枚でようやくオフセットの発生が認められたの
に対し、対照例1および2では約8万枚、対照例3では
約7千枚でオフセットが発生した。また対照例3では通
紙1万2千枚を越えるころから定着ローラーのローラー
面にたい積したトナーおよび紙粉によって紙づまりの発
生をみた。The occurrence of offset in passing the paper to the fixing roller is mainly due to the unevenness of the oil supply to the fixing roller, but when the roller of each of the above-mentioned Examples and each control example was attached to the fixing roller, a paper passing test was conducted. In the example, the offset finally occurred at about 150,000 sheets, whereas the offset occurred at about 80,000 sheets in Comparative Examples 1 and 2, and about 7,000 sheets in Comparative Example 3. Further, in Comparative Example 3, occurrence of paper jam due to toner and paper dust accumulated on the roller surface of the fixing roller was observed after the number of passed sheets exceeded 12,000.
つぎに、前記実施例および各対照例のローラーによる用
紙へのオイル供給量をしらべたところ、第9図に示す成
績を得た。即ち対照例1および2は通紙開始の当初はオ
イル供給量がやや過剰であるが急速に低下し、約12万5
千枚でオイル供給能力を失うのに対し、実施例ではオイ
ル供給量の低下は緩やかであって、通紙15万枚において
なお必要最低量の供給量が確保されている。なお、対照
例3については通紙開始時には適量の供給があるがこの
オイル供給能力は受熱によるスポンジゴムの劣化のため
に急速に失われ、紙づまり発生のため1万7千枚で試験
中止のやむなきに至った。Next, when the amount of oil supplied to the paper by the rollers of the above-mentioned example and each control example was examined, the results shown in FIG. 9 were obtained. That is, in Comparative Examples 1 and 2, the oil supply amount was a little excessive at the beginning of the paper feeding, but the oil supply amount was rapidly decreased to about 125
While the oil supply capacity is lost after 1,000 sheets, the decrease in the oil supply amount is gradual in the embodiment, and the necessary minimum supply amount is still secured for the 150,000 sheets passed. In Comparative Example 3, an appropriate amount was supplied at the start of paper feeding, but this oil supply capacity was rapidly lost due to deterioration of the sponge rubber due to heat reception, and the test was stopped at 17,000 sheets due to paper jam. It came to unavoidable.
最後に、ローラーの長期間放置後における心体1内から
表層23へのオイル転移の態様につき試験したところ、第
10図の成績を得た。試験方法としては、何時でも使用に
供することができるように、当初外部から表層に2.0gの
オイルを含浸させた実施例および対照例1および2をと
り、6箇月間室温で保管した。試験成績が示すように、
対照例1および2については期間中オイル含浸量が次第
に増加し、6箇月後には対照例1は11.3gの含浸量(オ
イル転移量は9.3g)、対照例2は含浸量10.1g(オイル
転移量8.1g)となったのに対し、実施例によればオイル
転移量が僅少で、6箇月後における含浸量は3.4g(転移
量1.4g)であった。なお、対照例3については、放置開
始時にオイルを表層23のスポンジゴムに塗布してもほと
んど吸収しないので、塗布しないで放置したところ、当
初はもちろん、6箇月放置後においてもローラー面を手
で触れてもオイルのベトつきがほとんどなく、内部のオ
イルの表層23への転移の問題が事実上無視できるものと
考察された。6箇月間放置後の実施例および対照例1お
よび2をそれぞれ定着ローラーに装着して通紙を行った
ところ対照例1および2では用紙に著しいオイル汚れが
発生したのに対し、実施例ではオイル汚れは全く発生し
なかった。Finally, the state of oil transfer from the inside of the core body 1 to the surface layer 23 after the roller was left for a long time was tested.
I got 10 figures. As a test method, Example and Control Examples 1 and 2 in which the surface layer was impregnated with 2.0 g of the oil from the outside so as to be ready for use at any time were taken and stored at room temperature for 6 months. As the test results show,
For Control Examples 1 and 2, the oil impregnation amount gradually increased during the period, and after 6 months, Control Example 1 had an impregnation amount of 11.3 g (oil transfer amount was 9.3 g) and Control Example 2 had an impregnation amount of 10.1 g (oil transfer amount). The amount was 8.1 g), while the oil transfer amount was small according to the example, and the impregnation amount after 6 months was 3.4 g (transfer amount 1.4 g). In addition, in Comparative Example 3, even if the sponge rubber of the surface layer 23 is hardly absorbed even if the oil is applied to the surface layer 23 at the start of the application, it is left without application. It was considered that there was almost no stickiness of the oil when touched, and the problem of the transfer of the oil inside to the surface layer 23 was practically negligible. After the sheets were left for 6 months, the fixing roller was attached to each of the examples and the control examples 1 and 2, and when the paper was passed, the control examples 1 and 2 showed remarkable oil stains on the paper, while the oil was used in the example. No dirt was generated.
(発明の効果) 以上の試験成績の検討から明らかなように、この発明に
よれば、定着ローラーのローラー面の全面にオイルを一
様に行きわたらせ、大きいクリーニング効果が発揮でき
る。同時に定着ローラーに対し終始僅少、適正かつほと
んど均等な量のオイルを供給できるばかりでなく、高温
下の使用において部材の劣化が避けられ、かつ6箇月に
もおよび長期間の放置後でも、表層に過剰量のオイルが
蓄積されない。かくして、この発明によれば、多量の通
紙に対して優れたオフセット防止能力を定着装置に持続
させることが可能であると同時に、長期間の不使用放置
にも耐えるという、従来に例を見ない優秀な電子写真装
置のオフセット防止手段を提供することができる。(Effect of the Invention) As is clear from the examination of the above test results, according to the present invention, the oil can be uniformly spread over the entire roller surface of the fixing roller, and a large cleaning effect can be exhibited. At the same time, not only is it possible to supply a small, proper and almost even amount of oil to the fixing roller from beginning to end, but deterioration of the member is avoided during use at high temperatures, and the surface layer remains even after being left for 6 months or for a long time. Excess oil does not accumulate. Thus, according to the present invention, it is possible to maintain the excellent offset preventing ability for a large amount of paper in the fixing device, and at the same time, to endure unused for a long time. It is possible to provide an excellent anti-offset means for an electrophotographic device.
第1図はこの発明にかかるオフセット防止ローラーの一
実施例の軸直断面図、第2図は同じく軸断面図、第3図
は通紙中の定着装置の骨格図、第4図は発明の詳細な説
明の項に記載した実施例のオイル含浸層におけるオイル
分布パターンを示す図、第5図は第4図に対応する対照
例1の図、第6図は同じく対照例2の図、第7図は同じ
く対照例3の図、第8図は使用の過程において取出した
各対照例のトナー汚れの態様を示すローラーの平面図、
第9図は実施例および各対照例を装着した定着ローラー
による用紙へのオイル供給量の試験成績線図、第10図は
実施例、対照例1および対照例2の長期間放置試験にお
けるオイルの表層への転移の試験成績線図である。 Aはオイル、Sはオフセット防止ローラー、K1,K2は定
着ローラー、lは熱源ランプ、Pは用紙、tはトナー、
1は心体、11は筒壁、12は通孔、13は中間部、14はハン
点、15は支軸、16は拡散面、2はオイル含浸層、21は内
層、22は中間層、23は表層である。FIG. 1 is an axial sectional view of an embodiment of an offset prevention roller according to the present invention, FIG. 2 is an axial sectional view of the same, FIG. 3 is a skeleton view of a fixing device during sheet feeding, and FIG. The figure which shows the oil distribution pattern in the oil impregnated layer of the Example described in the detailed description section, FIG. 5 is the figure of the comparative example 1 corresponding to FIG. 4, FIG. 6 is the same figure of the comparative example 2, FIG. 7 is also a view of Comparative Example 3, and FIG. 8 is a plan view of a roller showing a mode of toner stain of each Comparative Example taken out during the use,
FIG. 9 is a test result diagram of the oil supply amount to the paper by the fixing roller equipped with the examples and the respective control examples, and FIG. 10 is a graph showing the oil amount in the long-term storage test of the examples, the control examples 1 and the control examples 2. It is a test-result diagram of transfer to the surface layer. A is oil, S is an offset prevention roller, K 1 and K 2 are fixing rollers, l is a heat source lamp, P is paper, t is toner,
1 is a core body, 11 is a cylinder wall, 12 is a through hole, 13 is an intermediate part, 14 is a hand point, 15 is a spindle, 16 is a diffusion surface, 2 is an oil impregnated layer, 21 is an inner layer, 22 is an intermediate layer, 23 is the surface layer.
フロントページの続き (56)参考文献 特開 昭60−252382(JP,A) 特開 昭60−144778(JP,A) 特開 昭52−119335(JP,A) 特開 昭63−121071(JP,A) 特開 昭60−136782(JP,A) 実開 昭60−110854(JP,U) 実開 昭61−104469(JP,U) 実開 昭58−10459(JP,U)Continuation of front page (56) Reference JP-A-60-252382 (JP, A) JP-A-60-144778 (JP, A) JP-A-52-119335 (JP, A) JP-A-63-121071 (JP , A) JP 60-136782 (JP, A) Actually opened 60-110854 (JP, U) Actually opened 61-104469 (JP, U) Actually opened 58-10459 (JP, U)
Claims (1)
止オイルを収容する中空の心体の筒壁に多数の通孔を分
散して穿つとともにその筒壁の周面をオイル含浸層で被
覆したローラーにおいて、前記オイル含浸層は高密度の
繊維層からなる内層と低密度の繊維層からなる表層との
間に耐熱弾性スポンジからなる中間層を介装してなる電
子写真定着装置のオフセット防止ローラー。1. A roller in which a large number of through holes are dispersedly formed in a cylindrical wall of a hollow core body for accommodating an offset preventing oil for fixing an electrophotographic image and the peripheral surface of the cylindrical wall is covered with an oil impregnated layer. In the offset prevention roller of the electrophotographic fixing device, the oil-impregnated layer has an intermediate layer made of a heat-resistant elastic sponge interposed between an inner layer made of a high-density fiber layer and a surface layer made of a low-density fiber layer.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP8621287A JPH07120120B2 (en) | 1987-04-08 | 1987-04-08 | Offset prevention roller for electrophotographic fixing device |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP8621287A JPH07120120B2 (en) | 1987-04-08 | 1987-04-08 | Offset prevention roller for electrophotographic fixing device |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS63250673A JPS63250673A (en) | 1988-10-18 |
JPH07120120B2 true JPH07120120B2 (en) | 1995-12-20 |
Family
ID=13880474
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP8621287A Expired - Lifetime JPH07120120B2 (en) | 1987-04-08 | 1987-04-08 | Offset prevention roller for electrophotographic fixing device |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPH07120120B2 (en) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE59302946D1 (en) * | 1992-10-22 | 1996-07-18 | Siemens Nixdorf Inf Syst | RELEASE AGENT DISPENSING DEVICE FOR A FIXING ROLLER OF A PRINT OR COPIER |
-
1987
- 1987-04-08 JP JP8621287A patent/JPH07120120B2/en not_active Expired - Lifetime
Also Published As
Publication number | Publication date |
---|---|
JPS63250673A (en) | 1988-10-18 |
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