JP2813297B2 - Fixing device for electrophotographic device - Google Patents
Fixing device for electrophotographic deviceInfo
- Publication number
- JP2813297B2 JP2813297B2 JP3949494A JP3949494A JP2813297B2 JP 2813297 B2 JP2813297 B2 JP 2813297B2 JP 3949494 A JP3949494 A JP 3949494A JP 3949494 A JP3949494 A JP 3949494A JP 2813297 B2 JP2813297 B2 JP 2813297B2
- Authority
- JP
- Japan
- Prior art keywords
- fixing
- fixing belt
- roller
- belt
- heating
- 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
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- Fixing For Electrophotography (AREA)
Description
【0001】[0001]
【産業上の利用分野】本発明は、記録媒体上のトナーを
溶融圧着して定着させるのに用いる電子写真装置用定着
装置に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fixing device for an electrophotographic apparatus used for fixing a toner on a recording medium by fusing and pressing.
【0002】[0002]
【従来の技術】電子写真装置用定着装置には、従来から
いわゆる加熱ローラ方式が多く用いられている。これは
表面に非粘着性の物質により構成される被覆を設けた一
対のローラの内部に加熱源を設けると共に、両ローラ間
に適当な圧力を加えつつ回転させ、トナーを転写した記
録媒体を上記一対のローラ間を通過させて定着を行なっ
ている。2. Description of the Related Art As a fixing device for an electrophotographic apparatus, a so-called heating roller system has been conventionally used in many cases. This is accomplished by providing a heating source inside a pair of rollers provided with a coating made of a non-adhesive substance on the surface, and rotating the roller while applying an appropriate pressure between the two rollers, so that the recording medium on which the toner has been transferred is described above. The fixing is performed by passing between a pair of rollers.
【0003】これに対し近時においては、上記一対のロ
ーラの一方と第3のローラとの間にベルトを掛け回し、
該ベルト面で記録媒体上のトナーを加圧するようにした
技術が開発されている。例えば(a)特開平4−508
83号では(図5)、耐熱弾性定着ローラaと加熱支持
ローラb間に良熱伝導性定着ベルトcを掛け回し、定着
ベルトcを介して下方から定着ローラaを押圧する加圧
ローラdを設けて定着ベルトcと加圧ローラd間でトナ
ーe′と記録媒体eを挟んで画像を定着し、ヒータfの
加熱によって定着ローラaの耐熱弾性層が剥離すること
がないようにしている。On the other hand, recently, a belt has been wound between one of the pair of rollers and a third roller,
A technique has been developed in which the toner on the recording medium is pressed by the belt surface. For example, (a) JP-A-4-508
In No. 83 (FIG. 5), a heat-conductive fixing belt c is wrapped around a heat-resistant elastic fixing roller a and a heat supporting roller b, and a pressure roller d pressing the fixing roller a from below through the fixing belt c is provided. The toner image is fixed between the fixing belt c and the pressure roller d with the toner e 'and the recording medium e therebetween, and the heat-resistant elastic layer of the fixing roller a is not peeled off by heating the heater f.
【0004】また、(b)特開平4−273274号に
あっては(図6)、加熱定着ローラa1 と支持ローラb
1 間に掛け回した定着ベルトc1 を加熱定着ローラa1
に対して下方から押圧する加熱加圧ローラd1 を設け、
トナーe′を定着した後の記録媒体eをガイドg上にお
いて冷却装置hにより冷却しつつ定着ベルトc1 と共に
搬送し、該冷却後において画像支持体eを定着ベルトc
1 から分離することによりシリコンオイル等の離型剤を
使用しないでオフセット転写のない定着画像が得られる
ようにしている。[0004] Further, in the (b) JP-A-4-273274 (FIG. 6), a heat fixing roller a 1 and the support roller b
The fixing belt c 1 wrapped around for one time is heated to the fixing roller a 1.
The heating and pressing roller d 1 for pressing from below provided for,
Conveying the recording medium e after fixing the toner e 'with the fixing belt c 1 while cooling by the cooling device h on guide g, a fixing belt c the image support e after the cooling
By separating from 1, the fixed image without offset transfer can be obtained without using a release agent such as silicone oil.
【0005】また、(c)特開平5−11651号にあ
っては(図7)、定着ローラa2 、支持ローラb2 、定
着ベルトc2 、加圧ローラd2 及び定着ベルトc2 の加
熱用ヒータfから成る構成において、定着ベルトc2 の
下方に平行状態に記録媒体eの搬送装置iを設けてトナ
ーを予熱し、これによって定着温度を低く設定でき、定
着装置が簡素になり、小型化、低価格化が可能になるよ
うにしている。(C) In Japanese Patent Application Laid-Open No. 5-11651 (FIG. 7), heating of the fixing roller a 2 , the supporting roller b 2 , the fixing belt c 2 , the pressure roller d 2 and the fixing belt c 2 is performed. in the configuration consisting of use heater f, provided the transfer device i of the recording medium e parallel state of the lower fixing belt c 2 preheating the toner, thereby can set low fixing temperature, the fixing device is simplified, compact And lower prices are possible.
【0006】更に、(d)実開平4−124267号に
おいては、定着ベルトを金属を用いて構成し、ベルト定
着において高スピード化を図っても、熱伝導性が良いの
で昇温冷却がスムーズとなり、良好な画質を得ることが
できるようにしている。(D) In Japanese Utility Model Application Laid-Open No. 4-124267, even if the fixing belt is made of metal and the speed of belt fixing is increased, the heat conductivity is good and the heating and cooling becomes smooth. And good image quality can be obtained.
【0007】上記公知技術において、公知技術(a)で
は、加熱されている定着ベルトcによりトナーe′及び
記録媒体eを予熱する技術思想が存しないものであり、
公知技術(c)では、定着ベルトc2 による予熱につい
て記載されているが、特に低温定着用のカプセルトナー
の使用に関する技術であり、高温定着のトナー使用時に
発生するオフセットの防止について何等示唆するところ
がない。In the above-mentioned prior art, the prior art (a) has no technical idea of preheating the toner e 'and the recording medium e by the heated fixing belt c.
In the prior art (c), have been described for the preheating of the fixing belt c 2, in particular a technique relating to use of the capsule toner for low-temperature fixing, the place to suggest any way for preventing the offset that occurs when the toner used in the high-temperature fixing Absent.
【0008】また公知技術(b)は、定着動作後におい
て画像記録媒体eと共に移動する定着ベルトc1 の強制
冷却に関するものであり、公知技術(d)はかかる移動
行程における冷却を定着ベルト自体の構成によって自己
冷却するものである。Further prior art (b) are those forced cooling of the fixing belt c 1 which moves along with the image recording medium e about after the fixing operation, the prior art (d) shows the fixing belt itself cooled in the mobile stroke It is self-cooling depending on the configuration.
【0009】[0009]
【発明が解決しようとする課題】本発明においては、定
着ベルトを介してトナー及び記録媒体を予熱することに
よりニップ部の温度を低く設定すると共に、定着ベルト
として熱容量の小さいベルトを用いることによりニップ
部通過時において定着ベルトを急速に冷却させ、よって
ニップ部出口で定着ベルトと分離する記録媒体上のトナ
ーの温度を抑制することによりオイルレスまたは微量オ
イル塗布でオフセットのない画像を得ることを意図する
ものである。In the present invention, the temperature of the nip is set low by preheating the toner and the recording medium via a fixing belt, and the nip is formed by using a belt having a small heat capacity as the fixing belt. The purpose is to obtain an image without offset by oilless or trace amount oil application by rapidly cooling the fixing belt at the time of passing through the section and suppressing the temperature of the toner on the recording medium that separates from the fixing belt at the nip exit. Is what you do.
【0010】[0010]
【課題を解決するための手段】上記の目的を達成するた
め、本発明においては、定着ローラと加熱ローラ間にベ
ルト主体の表面に離型層を有する無端状の定着ベルトを
張設し、該定着ベルトを介して下方から該定着ローラを
押圧する加圧ローラを設けて該定着ベルトと該加圧ロー
ラ間にニップ部を構成し、該加熱ローラと該ニップ部間
における該定着ベルトの下方の近接位置において記録媒
体支持体を設けて該定着ベルトとの間に略直線状の加熱
通路を形成し、該定着ベルトの1cm2 当りの熱容量を
0.002〜0.025cal/℃として成ることを特
徴とする。In order to achieve the above object, according to the present invention, an endless fixing belt having a release layer on the surface of a belt main body is stretched between a fixing roller and a heating roller. A pressure roller that presses the fixing roller from below via a fixing belt is provided to form a nip portion between the fixing belt and the pressure roller, and a nip portion between the heating roller and the nip portion below the fixing belt. A recording medium support is provided at the close position to form a substantially linear heating path between the fixing belt and the fixing belt, and the heat capacity per 1 cm 2 of the fixing belt is 0.002 to 0.025 cal / ° C. Features.
【0011】[0011]
【作用】定着ベルトは熱容量が小さいために、ニップ部
においてトナー及び記録媒体に熱を奪われることにより
自ら冷却をきたし、これによって溶融トナーの温度が必
要以上に高められることなく、確実に定着ベルトとトナ
ーが剥離し、オフセットが防止される。Since the fixing belt has a small heat capacity, the toner and the recording medium take heat away from the nip portion to cool down itself, so that the temperature of the molten toner is not raised unnecessarily. And the toner is peeled off, and offset is prevented.
【0012】[0012]
【実施例】図1はカラー複写機の定着装置であり、R1
は定着ローラ、R2 は加圧ローラ、R3 は加熱ローラ、
Bは定着ベルト、H1 ,H2 は加熱源、S1 ,S2 は温
度制御手段としてのサーミスタ、Gはガイド板、Pはト
ナーが転写された記録媒体の加熱通路を示す。DETAILED DESCRIPTION FIG. 1 is a fixing device of a color copying machine, R 1
Is a fixing roller, R 2 is a pressure roller, R 3 is a heating roller,
B denotes a fixing belt, H 1 and H 2 denote heating sources, S 1 and S 2 denote thermistors as temperature control means, G denotes a guide plate, and P denotes a heating path of a recording medium onto which toner has been transferred.
【0013】定着ローラR1 は、直径34mmのアルミ
ニウム芯金1上に厚さ3mmのシリコーンゴムによる耐
熱弾性被覆層2を設けて構成され、加圧ローラR2 は直
径40mmのアルミニウム芯金3上に50μmのシリコ
ーンゴムによる耐熱弾性被覆層4を設けて構成されるも
のであり、耐熱弾性被覆層2の表面硬度は耐熱弾性被覆
層4の硬度と同等あるいはそれより軟らかく設定してあ
る。The fixing roller R 1 is formed by providing a heat-resistant elastic coating layer 2 made of silicone rubber having a thickness of 3 mm on an aluminum core 1 having a diameter of 34 mm, and a pressure roller R 2 is provided on an aluminum core 3 having a diameter of 40 mm. Is provided with a heat-resistant elastic coating layer 4 of 50 μm silicone rubber. The surface hardness of the heat-resistant elastic coating layer 2 is set equal to or softer than the hardness of the heat-resistant elastic coating layer 4.
【0014】加熱ローラR3 は直径40mmのアルミニ
ウム芯金5に30μmのテフロン被覆層6を有し、定着
ベルトBの寄り止め対策用に軸方向の両端部において定
着ベルトBの厚さより大きな段差部7を有する段付きロ
ーラとして構成される(図2参照)。The heating roller R 3 has a Teflon coating layer 6 having a thickness of 30 μm on an aluminum core 5 having a diameter of 40 mm, and a step portion having a thickness larger than the thickness of the fixing belt B at both ends in the axial direction for preventing the fixing belt B from shifting. 7 (see FIG. 2).
【0015】テンションローラR4 は、直径20mmの
アルミニウム材で形成され、その形状はストレート、逆
クラウン、或いは正クラウンの内で任意に選択でき、ク
リーニング及び微量オイル塗布を兼ねることができる。
定着ベルトBは、厚さ45μmの電鋳による金属ニッケ
ルの無端状ベルト主体B1 の外周面に50μmのシリコ
ーンゴムによる離型層B2 を設けて構成されたもの、又
は厚さ55μmのポリイミド樹脂の無端状ベルト主体B
1 の外周面に130μmのシリコーンゴムによる離型層
B2 を設けて構成されたもの(図3参照)である。The tension roller R 4 is formed of an aluminum material having a diameter of 20 mm, and its shape can be arbitrarily selected from a straight, an inverted crown, or a regular crown, and can perform both cleaning and application of a small amount of oil.
The fixing belt B is one configured to provide a thickness of 45μm release layer B 2 according to 50μm silicone rubber on the outer peripheral surface of the endless belt mainly B 1 of metallic nickel by electroforming, or thickness 55μm polyimide resin Endless belt main body B
Those formed by providing a release layer B 2 with silicone rubber 130μm on the outer circumferential surface of 1 a (see FIG. 3).
【0016】加熱ローラR3 の内部には主加熱源H1 が
設けられ、加圧ローラR2 の内部には補助加熱源H2 が
設けられ、また定着ローラR1 の内部にも必要に応じて
補助加熱源を設けることができる。加熱ローラR3 の外
側において、主加熱源H1 の温度を制御するためサーミ
スタS1 が定着ベルトBに接して設けられ、加圧ローラ
R2 に接してサーミスタS 2 が設けられる。Heating roller RThreeInside the main heating source H1But
Provided, a pressure roller RTwoInside the auxiliary heating source HTwoBut
Provided, and a fixing roller R1Inside as needed
An auxiliary heating source can be provided. Heating roller RThreeOutside
On the side, the main heating source H1To control the temperature of the thermistor
Star S1Is provided in contact with the fixing belt B, and a pressure roller
RTwoIn contact with thermistor S TwoIs provided.
【0017】記録媒体支持体としての金属材から成るガ
イド板Gは、加熱ローラR3 付近からニップ部Nの手前
にかけて定着ベルトBの下方位置において定着ベルトB
との間隔が0.5〜10mmの範囲内において定着ベル
トBと略平行状態に設置され、定着ベルトBとの間にお
いて加熱ローラR3 付近からニップ部Nの手前にかけて
略直線状に延長し、トナーC1 及び記録媒体Cを予熱す
る加熱通路Pを形成する。A guide plate G made of a metal material as a recording medium support is provided below the fixing belt B at a position below the fixing belt B from near the heating roller R 3 to just before the nip portion N.
Distance between is disposed substantially parallel state and the fixing belt B in the range of 0.5 to 10 mm, extending substantially linearly toward the front of the nip portion N from the vicinity of the heating roller R 3 between the fixing belt B, A heating path P for preheating the toner C 1 and the recording medium C is formed.
【0018】加圧ローラR2 は一対のスプリング8によ
り加圧レバー9を介して定着ローラR1 に向けて加圧さ
れ、ニップ部Nにおける定着圧は66kgに設定され
る。運転時において、定着ベルトBは100mm/sの
線速で加熱ローラR3 から定着ローラR1 と加圧ローラ
R2 間のニップ部Nにかけて直線的に移動し、これと同
速度で記録媒体Cが搬送手段Tによりガイド板G上の加
熱通路Pに送り込まれ、ガイド板G上において加熱通路
Pを定着ベルトBと非接触状態で移動する際に定着ベル
トBと熱エネルギーを蓄積しているガイド板Gにより予
熱される。好適な加熱条件として、加熱ローラR3 の温
度150〜170℃、加熱空間Pにおける定着ベルトB
の温度145〜165℃、ニップ部Nにおける加圧ロー
ラR2 の温度108〜123℃となるようにサーミスタ
ーS1 により設定され、加熱通路Pを移動する際に未定
着画像を形成するトナーC1 が軟化する。The pressure roller R 2 is pressurized toward the fixing roller R 1 through pressure lever 9 by a pair of springs 8, the fixing pressure in the nip portion N is set to 66 kg. During operation, the fixing belt B is linearly moved toward the nip portion N between the fixing roller R 1 and the pressure roller R 2 from the heating roller R 3 at a linear velocity of 100 mm / s, the recording medium C at this same speed Is fed into the heating passage P on the guide plate G by the transport means T, and the guide accumulating thermal energy with the fixing belt B when moving through the heating passage P on the guide plate G in a non-contact state with the fixing belt B. Preheated by plate G. As preferable heating conditions, the temperature of the heating roller R 3 is 150 to 170 ° C., and the fixing belt B in the heating space P is
Temperature one hundred and forty-five to one hundred and sixty-five ° C., is set by the thermistor S 1 such that the temperature one hundred and eight to one hundred and twenty-three ° C. of the pressure roller R 2 at the nip portion N, the toner C for forming an unfixed image when moving heating passage P 1 softens.
【0019】定着ベルトBは、熱容量を小さく設定され
ているので、加熱ローラR3 部分で定着に必要な温度に
容易に加熱されてニップ部Nに達し、定着ベルトBと同
速度で移動するトナーC1 と記録媒体Cは蓄熱している
ガイド板Gに接触しながら加熱通路Pを移動すると共
に、定着ベルトBの輻射熱により予熱されるので、ニッ
プ部Nの温度が従来よりも低い状態において溶融して定
着可能となる。The fixing belt B, the toner because it is smaller the heat capacity, which is easily heated to a temperature necessary for fixing at the heating roller R 3 moiety reaches the nip portion N, moves the fixing belt B at the same speed with C 1 and the recording medium C is moved a heating passage P while being in contact with the guide plate G that heat storage, since it is pre-heated by radiant heat of the fixing belt B, melting at a temperature lower than the conventional state of the nip portion N And fixable.
【0020】定着時において主加熱源H1 により加熱さ
れた熱容量の小さい定着ベルトBはその熱をトナーC1
と記録媒体Cに与えて定着ベルトB自体が冷えることに
より、ニップ部Nの出口でのトナーの温度が従来のロー
ラ定着等の場合に比べて大巾に低くなり、トナーと定着
ベルトBの離型層B2 との分離性が良くなって、オイル
レスまたは微量オイル塗布によってオフセットのない定
着画像が得られる。At the time of fixing, the fixing belt B having a small heat capacity heated by the main heating source H 1 transfers the heat to the toner C 1.
And the fixing belt B is cooled by applying it to the recording medium C, so that the temperature of the toner at the exit of the nip portion N becomes much lower than that in the case of the conventional roller fixing and the like, and the toner and the fixing belt B are separated. getting better separation of the mold layer B 2, fixed image without offset is obtained by the oil-less or trace oil coating.
【0021】定着ベルトBの1cm2 当りの熱容量は
0.002〜0.025cal/℃の範囲内に設定され
る。この範囲以下だと熱容量が少なすぎて低温オフセッ
トが発生し易くなるので、加熱ローラR3 の温度を高く
設定しなければならず、定着ベルトBに対する熱負荷が
大きく、またこの範囲以上になると熱容量が大きくなり
すぎてニップ部Nでの温度低下が少なく、高温オフセッ
トの発生を抑制するために多量のオイル塗布が必要とな
る。定着ベルトBの1cm2 当りの熱容量は、好ましく
は0.005〜0.01cal/℃である。The heat capacity per 1 cm 2 of the fixing belt B is set in the range of 0.002 to 0.025 cal / ° C. Since low-temperature offset heat capacity that it follows the range is too small is likely to occur, should be set high temperature of the heating roller R 3, large thermal load against the fixing belt B, also becomes more than this range the thermal capacity Becomes too large, the temperature drop at the nip portion N is small, and a large amount of oil application is required to suppress the occurrence of high-temperature offset. The heat capacity per 1 cm 2 of the fixing belt B is preferably 0.005 to 0.01 cal / ° C.
【0022】定着ベルトBの1cm2 当りの熱容量は、
比熱(cal/℃・g)×密度(g/cm3 )×厚さ(c
m)×1(cm2 )で表されるから、本実施例で用いた定
着ベルトBの熱容量は、それぞれ (Ni電鋳45μmの熱容量)+(シリコーンゴム50
μmの熱容量)=(0.106×8.80×0.004
5)+(0.26×1.05×0.005)≒0.00
56cal/℃、及び (ポリイミド55μmの熱容量)+(シリコーンゴム1
30μmの熱容量)=(0.24×1.40×0.00
55)+(0.26×1.05×0.013)≒0.0
054cal/℃となる。The heat capacity per 1 cm 2 of the fixing belt B is
Specific heat (cal / ℃ · g) × Density (g / cm 3) × thickness (c
m) × 1 (cm 2 ), the heat capacity of the fixing belt B used in this embodiment is (heat capacity of 45 μm of Ni electroformed) + (silicone rubber 50 μm).
μm heat capacity) = (0.106 × 8.80 × 0.004)
5) + (0.26 × 1.05 × 0.005) ≒ 0.00
56 cal / ° C. and (heat capacity of polyimide 55 μm) + (silicone rubber 1
30 μm heat capacity) = (0.24 × 1.40 × 0.00)
55) + (0.26 × 1.05 × 0.013) ≒ 0.0
054 cal / ° C.
【0023】定着ローラR1 の表面硬度を加圧ローラR
2 の表面硬度と同等あるいはそれより軟らかく設定して
あるので、ニップ部Nにおいては加圧ローラR2 の一部
が定着ベルトBと共に定着ローラR1 に喰い込むように
なり、従ってニップ部Nから出る紙等の記録媒体Cの先
端の向きが水平状以下において加圧ローラR2 側の下向
きとなるので、定着ベルトB側の分離爪が不要となる
(図4参照)。The surface hardness of the fixing roller R 1 is determined by
Since than equal to 2 in surface hardness or it is set soft, become a part of the pressing roller R 2 bite into the fixing roller R 1 together with the fixing belt B in the nip N, thus the nip N the tip direction of the recording medium C such as paper out is a downward pressure roller R 2 side in less horizontally, separation claws of the fixing belt B side is not required (see FIG. 4).
【0024】寒冷地等において、始動直後に加圧ローラ
R2 が冷えすぎていると定着性能に支障をきたす場合が
あるので、その場合には補助加熱源H2 で加熱する。定
着ベルトBの片寄りについては、定着ベルトBの剛性を
利用してニップ部Nに発生した片寄りの力を加熱ローラ
R3 に設けたベルトの厚さと同等以上の段差部7で修正
しても十分に耐えられる。[0024] In cold climates, etc., because it may interfere with the fixing performance and pressure roller R 2 is too cold immediately after startup, in which case the heating in the auxiliary heat source H 2. The deviation of the fixing belt B is fixed in the fixing belt stepped portion 7 thickness and more comparable belt provided to the force of the heating roller R 3 of offset generated in the nip portion N by utilizing the rigidity of the B Can withstand well.
【0025】〔実験例1〕図1の通りの構造を有し、定
着ベルトとして(Ni電鋳ベルト45μm+シリコーン
ゴム50μm)のものを装着した本発明の定着装置を用
い、トナーとしてミノルタカメラCF−70用トナーを
使用して、装置の各部の設定温度を多段階に変更して普
通紙に対するトナー画像の定着を行なった。そして、定
着性能の評価をした結果を表1に示した。なお、次の条
件は一定とした。 定着ベルトの線速: 100mm/s 加圧ローラの加圧力: 66kg 定着ベルトとガイド板の間隔: 3mmEXPERIMENTAL EXAMPLE 1 A fixing device of the present invention having a structure as shown in FIG. 1 and having a fixing belt (Ni electroformed belt 45 μm + silicone rubber 50 μm) was used, and a Minolta camera CF- was used as toner. Using a 70 toner, the set temperature of each part of the apparatus was changed in multiple stages to fix the toner image on plain paper. Table 1 shows the results of the evaluation of the fixing performance. The following conditions were fixed. Linear velocity of fixing belt: 100 mm / s Pressure of pressure roller: 66 kg Distance between fixing belt and guide plate: 3 mm
【0026】[0026]
【表1】 [Table 1]
【0027】〔実験例2〕定着ベルトとして(ポリイミ
ド55μm+シリコーンゴム130μm)のものを装着
した本発明の定着装置を用いたほかは実験例1と同様な
条件で、普通紙に対するトナー画像の定着を行い、定着
性能の評価をした結果を表2に示した。[Experimental Example 2] A toner image was fixed on plain paper under the same conditions as in Experimental Example 1 except that the fixing device of the present invention equipped with a fixing belt of (polyimide 55 μm + silicone rubber 130 μm) was used. Table 2 shows the evaluation results of the fixing performance.
【0028】[0028]
【表2】 [Table 2]
【0029】〔実験例3〕実験例1と同様にしてOHP
紙に対するトナー画像の定着を行い、定着画像の透過率
を測定した結果をローラ定着方式のミノルタカメラCF
−70実機による定着結果と比較したところ、以下のよ
うな結果が得られた。全透過率は、ローラ定着とベルト
定着はほぼ同じであった。透過率は、各色においていず
れもベルト定着の方がローラ定着の値の2〜3倍であっ
た。濁度は、各色においてベルト定着はローラ定着の1
/2程度であった。つまり、排紙時のベルト及びトナー
表面温度がローラ定着の場合より低くて、トナーの凝集
力が強いために、定着ベルトにトナーが引張られること
がなく、平滑なトナー画像面が得られるものである。[Experimental Example 3] OHP was performed in the same manner as in Experimental Example 1.
The toner image is fixed to the paper, and the transmittance of the fixed image is measured.
The following results were obtained as compared with the fixing results obtained by using a −70 actual machine. The total transmittance was almost the same for roller fixing and belt fixing. The transmittance of each color was 2 to 3 times that of the roller fixing value for each color. Turbidity is 1 for belt fixing for each color.
/ 2. In other words, since the surface temperature of the belt and toner at the time of paper ejection is lower than that in the case of roller fixing and the cohesive force of the toner is strong, the toner is not pulled on the fixing belt and a smooth toner image surface is obtained. is there.
【0030】[0030]
【発明の効果】本発明は上記した如くに、定着ローラと
加熱ローラ間に高ヤング率で耐熱性の金属や樹脂で構成
されたベルト主体の表面に離型層を有する無端状の定着
ベルトを張設し、定着ベルトを介して下方から定着ロー
ラを押圧する加圧ローラを設けて定着ベルトと加圧ロー
ラ間にニップ部を構成し、加熱ローラとニップ部間にお
ける定着ベルトの下方の近接位置において記録媒体支持
体を設けて定着ベルトとの間に略直線状の加熱通路を形
成し、定着ベルトの1cm2 当りの熱容量を0.002
〜0.025cal/℃として成るものであるから、加
熱通路における予熱効果によりニップ部の定着温度を低
くすることに加えて、熱容量の小さい定着ベルトのニッ
プ部における自己冷却作用によりトナーの温度を過度に
高めることなく定着ベルトとの離型性を良くし、オイル
レス又は微量オイル塗布によってオフセットのない定着
画像を得ることができる。As described above, according to the present invention, there is provided an endless fixing belt having a release layer on the surface of a belt mainly composed of a heat-resistant metal or resin having a high Young's modulus between a fixing roller and a heating roller. A pressure roller that stretches and presses the fixing roller from below via the fixing belt to form a nip portion between the fixing belt and the pressure roller, and an adjacent position below the fixing belt between the heating roller and the nip portion , A recording medium support is provided to form a substantially linear heating path between the fixing belt and the fixing belt, and the heat capacity per 1 cm 2 of the fixing belt is 0.002.
0.025 cal / ° C., so that in addition to lowering the fixing temperature at the nip due to the preheating effect in the heating passage, the toner temperature is excessively increased due to the self-cooling action at the nip of the fixing belt having a small heat capacity. The releasability from the fixing belt can be improved without increasing the quality of the image, and a fixed image without offset can be obtained by applying an oil-less or trace amount of oil.
【図1】本発明の電子写真装置用定着装置の一実施例に
ついての側面図である。FIG. 1 is a side view of an embodiment of a fixing device for an electrophotographic apparatus according to the present invention.
【図2】同上における加熱ローラの正面図である。FIG. 2 is a front view of the heating roller in the above.
【図3】同上における定着ベルトの拡大断面図である。FIG. 3 is an enlarged sectional view of the fixing belt in the same.
【図4】ニップ部の動作を示す拡大図である。FIG. 4 is an enlarged view showing an operation of a nip portion.
【図5】従来例の説明図である。FIG. 5 is an explanatory diagram of a conventional example.
【図6】他の従来例の説明図である。FIG. 6 is an explanatory diagram of another conventional example.
【図7】更に他の従来例の説明図である。FIG. 7 is an explanatory view of still another conventional example.
R1 定着ローラ R2 加圧ローラ R3 加熱ローラ B 定着ベルト B1 ベルト主体 B2 離型層 G ガイド板 P 加熱通路R 1 fixing roller R 2 pressure roller R 3 heating roller B fixing belt B 1 belt main body B 2 release layer G guide plate P heating passage
───────────────────────────────────────────────────── フロントページの続き (56)参考文献 特開 平1−263677(JP,A) 特開 平2−162383(JP,A) 特開 平4−50883(JP,A) 特開 平4−122969(JP,A) 特開 平4−186270(JP,A) 特開 平4−273274(JP,A) 特開 平5−11651(JP,A) 特開 平6−202527(JP,A) 特開 平6−230599(JP,A) 特開 平6−295091(JP,A) 実開 昭61−13862(JP,U) 実開 平2−140555(JP,U) 実開 平4−124267(JP,U) (58)調査した分野(Int.Cl.6,DB名) G03G 15/20──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-1-263677 (JP, A) JP-A-2-162383 (JP, A) JP-A-4-50883 (JP, A) JP-A-4-263 122969 (JP, A) JP-A-4-186270 (JP, A) JP-A-4-273274 (JP, A) JP-A-5-11651 (JP, A) JP-A-6-202527 (JP, A) JP-A-6-230599 (JP, A) JP-A-6-295091 (JP, A) JP-A-61-13862 (JP, U) JP-A-2-140555 (JP, U) JP-A-4-124267 (JP, U) (58) Field surveyed (Int. Cl. 6 , DB name) G03G 15/20
Claims (1)
の表面に離型層を有する無端状の定着ベルトを張設し、
該定着ベルトを介して下方から該定着ローラを押圧する
加圧ローラを設けて該定着ベルトと該加圧ローラ間にニ
ップ部を構成し、該加熱ローラと該ニップ部間における
該定着ベルトの下方の近接位置において記録媒体支持体
を設けて該定着ベルトとの間に略直線状の加熱通路を形
成し、該定着ベルトの1cm2 当りの熱容量を0.00
2〜0.025cal/℃として成ることを特徴とする
電子写真装置用定着装置。An endless fixing belt having a release layer on the surface of a belt main body is stretched between a fixing roller and a heating roller,
A pressure roller that presses the fixing roller from below through the fixing belt is provided to form a nip portion between the fixing belt and the pressure roller, and a nip portion is provided between the heating roller and the nip portion below the fixing belt. A recording medium support is provided in the vicinity of the fixing belt to form a substantially linear heating passage between the fixing belt and the fixing belt, and the heat capacity per 1 cm 2 of the fixing belt is 0.00
A fixing device for an electrophotographic apparatus, wherein the fixing device has a temperature of 2 to 0.025 cal / ° C.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP3949494A JP2813297B2 (en) | 1993-03-10 | 1994-03-10 | Fixing device for electrophotographic device |
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP5-49232 | 1993-03-10 | ||
JP4923293 | 1993-03-10 | ||
JP3949494A JP2813297B2 (en) | 1993-03-10 | 1994-03-10 | Fixing device for electrophotographic device |
Publications (2)
Publication Number | Publication Date |
---|---|
JPH06318001A JPH06318001A (en) | 1994-11-15 |
JP2813297B2 true JP2813297B2 (en) | 1998-10-22 |
Family
ID=26378903
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP3949494A Expired - Lifetime JP2813297B2 (en) | 1993-03-10 | 1994-03-10 | Fixing device for electrophotographic device |
Country Status (1)
Country | Link |
---|---|
JP (1) | JP2813297B2 (en) |
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