JPH01147575A - Heat fixing device - Google Patents
Heat fixing deviceInfo
- Publication number
- JPH01147575A JPH01147575A JP30711987A JP30711987A JPH01147575A JP H01147575 A JPH01147575 A JP H01147575A JP 30711987 A JP30711987 A JP 30711987A JP 30711987 A JP30711987 A JP 30711987A JP H01147575 A JPH01147575 A JP H01147575A
- Authority
- JP
- Japan
- Prior art keywords
- transfer paper
- guide
- cooling member
- fixing device
- water drops
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000001816 cooling Methods 0.000 claims abstract description 20
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 20
- 238000010438 heat treatment Methods 0.000 claims description 5
- 230000005484 gravity Effects 0.000 claims 1
- 230000002411 adverse Effects 0.000 abstract description 2
- 238000009833 condensation Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 241000519995 Stachys sylvatica Species 0.000 description 3
- 230000005494 condensation Effects 0.000 description 3
- 108091008695 photoreceptors Proteins 0.000 description 3
- 230000007547 defect Effects 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 239000011347 resin Substances 0.000 description 2
- 229920005989 resin Polymers 0.000 description 2
- 238000009423 ventilation Methods 0.000 description 2
- YCKRFDGAMUMZLT-UHFFFAOYSA-N Fluorine atom Chemical compound [F] YCKRFDGAMUMZLT-UHFFFAOYSA-N 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 210000000078 claw Anatomy 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 229910052731 fluorine Inorganic materials 0.000 description 1
- 239000011737 fluorine Substances 0.000 description 1
- 238000003384 imaging method Methods 0.000 description 1
- 238000011835 investigation Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 238000011144 upstream manufacturing Methods 0.000 description 1
Landscapes
- Fixing For Electrophotography (AREA)
Abstract
Description
【発明の詳細な説明】
（技術分野）
本発明は熱定着装置に関し、より詳細には複写機、ファ
クシミリ、その他プリンタに適用しうる熱定着装置に関
するものである。DETAILED DESCRIPTION OF THE INVENTION (Technical Field) The present invention relates to a thermal fixing device, and more particularly to a thermal fixing device applicable to copying machines, facsimile machines, and other printers.
（従来技術）
複写機等において、一対の加熱用ローラー間に転写紙を
通過させて転写紙上の未定着トナーを熱定着する定着装
置が知られている。(Prior Art) In copying machines and the like, a fixing device is known in which unfixed toner on the transfer paper is thermally fixed by passing the transfer paper between a pair of heating rollers.
しかし、このような熱定着装置では転写紙に含まれる水
分が定着時に加えられる熱により蒸発し、再び凝集結露
して転写紙に付着して紙を変形させるなど種々の弊害の
原因となっている。However, in such thermal fixing devices, the water contained in the transfer paper evaporates due to the heat applied during fixing, and condenses and condenses again, adhering to the transfer paper and causing various problems such as deforming the paper. .
例えば第４図に示す構成では、内部に熱源を有する定着
ローラー１に加圧ローラー２が対向圧接されていて一対
の加熱用ローラーを構成し、転写紙Ｓを下からくわえ込
んで上向きに送る間に未定着トナーを熱定着する。For example, in the configuration shown in FIG. 4, a pressure roller 2 is opposed to and pressed against a fixing roller 1 having a heat source inside, forming a pair of heating rollers, which hold the transfer paper S from below and feed it upward. The unfixed toner is heat-fixed.
定着後の転写紙Ｓはガイド板３と分離爪４で挾まれた空
隙を上方に進み、一対の送りローラー５により定着装置
６より排出される。After fixing, the transfer paper S advances upward through the gap between the guide plate 3 and the separation claw 4, and is discharged from the fixing device 6 by a pair of feed rollers 5.
この構成では転写紙Ｓより蒸発した水分は定着ローラー
１と接°触している蒸発場所よりも温度の低い物体、例
えばコピー停止中にガイドＦｉ３が冷えていると、これ
に接触したときに凝集結露する。In this configuration, the moisture evaporated from the transfer paper S condenses when it comes into contact with an object that is lower in temperature than the evaporation point that is in contact with the fixing roller 1, for example, if the guide Fi3 is cold while copying is stopped. Condensation occurs.
結露した水滴１１は転写紙Ｓがガイド板３を通過する際
に転写紙に付着し、転写紙を変形させてコピ−の品位を
低下させ、また両面コピーや合成コピーに際して再転写
される際に白抜けの原因となり、或いは所謂ジャム等の
搬送不良をひき起こしてしまう。The condensed water droplets 11 adhere to the transfer paper when the transfer paper S passes through the guide plate 3, deforming the transfer paper and reducing the quality of the copy, and also when being retransferred during double-sided copying or composite copying. This may cause white spots or conveyance defects such as so-called jams.
上記の問題を解決すべく１例えば上記ガイド板３に代え
て第５図に符号７で示す如く針金でガイド部材を構成し
さらにファン等によって風の流れを形成して蒸発領域で
の水蒸気を下げ、結露の発生を最小限に抑えようとする
提案もなされている。In order to solve the above problems, 1. For example, instead of the guide plate 3, a guide member is constructed of a wire as shown by the reference numeral 7 in FIG. , proposals have also been made to minimize the occurrence of condensation.
しかし、この案でも風の流れは同時に針金を冷却するた
め、針金に水分が凝集結露することは避けられず前記問
題の根本的な解決をみるには至っていない。However, even with this proposal, since the flow of air cools the wire at the same time, it is inevitable that moisture will condense and condense on the wire, and the fundamental solution to the above problem has not yet been found.
（目 的）
従って本発明の目的は結露した水滴が転写紙に付着して
コピー不良等を起こすことを防止しうる熱定着装置を提
供することにある。(Objective) Accordingly, an object of the present invention is to provide a heat fixing device that can prevent condensed water droplets from adhering to transfer paper and causing copy defects.
（構 成）
本発明は上記の目的を達成させるため、加熱用ローラー
が転写紙先端をくわえ始める定着ニップ部を下流直後に
設けた転写紙ガイド部材を通気自在に構成し、このガイ
ド部材の重力方向上側に冷却部材を配置し、この冷却部
材の下面を案内面として該冷却部材に付着した水滴を受
け部に導くようにしたことを特徴としたものである。(Structure) In order to achieve the above object, the present invention has a transfer paper guide member provided immediately downstream of the fixing nip where the heating roller starts gripping the leading edge of the transfer paper, and is configured to be freely ventilable. A cooling member is arranged on the upper side in the direction, and the lower surface of the cooling member is used as a guide surface to guide water droplets adhering to the cooling member to a receiving portion.
以下、本発明の一実施例に基づいて具体的に説明する。Hereinafter, a detailed explanation will be given based on one embodiment of the present invention.
第１図に示す例において、一対の加熱用ローラーの構成
は第４図に示した従来技術と同じであるので同一符号で
示す。In the example shown in FIG. 1, the configuration of the pair of heating rollers is the same as that of the prior art shown in FIG. 4, so they are designated by the same reference numerals.
転写紙Ｓの搬送経路は破線の矢印で示す如く下から上に
向かうようになっている。The conveyance path of the transfer paper S is from bottom to top as shown by a broken line arrow.
本例では、ローラーが転写紙先端をくわえ始める定着ニ
ップ部Ａよりも搬送経路上下流直後に転写紙ガイド１０
を設けている。In this example, the transfer paper guide 10 is placed immediately upstream and downstream of the conveyance path from the fixing nip section A where the roller begins to grip the leading edge of the transfer paper.
has been established.
この転写紙ガイド１０は２次元的な広がりを有し。This transfer paper guide 10 has a two-dimensional spread.
多くの通気孔１０Ａを形成されることにより通気自在と
なっている。By forming many ventilation holes 10A, ventilation is possible.
この転写紙ガイド１０の斜め下方にはこれと対向して分
数系４が設けてあり、これらの対向空隙が転写紙搬送経
路の一部を構成している。A fractional system 4 is provided diagonally below the transfer paper guide 10 to face it, and these opposing gaps constitute a part of the transfer paper conveyance path.
転写紙ガイド１０の下面ガイド面は表面エネルギーの小
さい材料で構成することにより水滴が付き難くする０例
えば金属表面又は樹脂表面にフッソ系樹脂をコーティン
グ処理しておく。The lower guide surface of the transfer paper guide 10 is made of a material with low surface energy to prevent water droplets from adhering to it. For example, the metal surface or resin surface is coated with fluorine resin.
さらに、転写紙ガイド１０の上方にはこれと対向させて
金属板からなる冷却部材１１を設けている。Further, a cooling member 11 made of a metal plate is provided above the transfer paper guide 10 and facing it.
この冷却部材１１は緩く傾斜していて加圧ローラー２の
上方を経て垂直となり、軸１００に固定されている。This cooling member 11 is gently inclined, becomes vertical after passing above the pressure roller 2, and is fixed to a shaft 100.
上記冷却部材１１の垂直下端の下方には傾斜４！１２が
設けてあり、受け部材１３に導かれている。A slope 4!12 is provided below the vertical lower end of the cooling member 11, and is guided to a receiving member 13.
このような構成に係る熱定着装置では、定着ローラー１
、加圧ローラー２の回転に応じて空気の自然対流が生じ
、水蒸気が通気孔ＬＯＡより吸引されて冷却部材１１に
接触してｉｇ集結露して水滴が生ずるも、この水滴１１
は冷却部材１１の下面に案内されて転写紙Ｓに何らの悪
影響を及ぼさない受け部材１３に導かれる。In the heat fixing device having such a configuration, the fixing roller 1
Natural convection of air occurs in accordance with the rotation of the pressure roller 2, and water vapor is sucked through the vent LOA, contacts the cooling member 11, condenses, and forms water droplets.
is guided by the lower surface of the cooling member 11 and guided to the receiving member 13 which does not have any adverse effect on the transfer paper S.
第２図は本発明の他の実施例を分解した斜視図で説明し
たもので転写紙ガイド１００はくし状に形成されている
。又、冷却部材１１０は背部に多数のフィン１１０Ａが
形成されていて冷却効果を高め得るようにしである。FIG. 2 is an exploded perspective view of another embodiment of the present invention, in which the transfer paper guide 100 is formed in a comb shape. Further, the cooling member 110 has a large number of fins 110A formed on its back to enhance the cooling effect.
又、ファン１４及び吸引ダクト１５．排気ダクト１６の
組合せを設けている。つまり、吸引ダクト１５により転
写紙ガイド１００と冷却部材１１０との間の水蒸気を含
む空気を吸引し、排気ダクト１６よりファン１１０Ａの
部分に空気を排出して冷却部材１１０を冷却するように
している。Also, a fan 14 and a suction duct 15. A combination of exhaust ducts 16 is provided. That is, the suction duct 15 sucks air containing water vapor between the transfer paper guide 100 and the cooling member 110, and the air is discharged from the exhaust duct 16 to the fan 110A to cool the cooling member 110. .
ちなみに、定着前後での含水量の変化を各種の転写紙５
１〜Ｓ６について調べた結果を（表−１）に示す。By the way, the change in moisture content before and after fixing was measured using various transfer papers5.
Table 1 shows the results of the investigation for 1 to S6.
（表−１）
この（表−１）からもわかるように定着に際しては転写
紙Ｓからは多量の水分が失なわれ、これが水滴となって
転写紙に落下して白抜けやジャムの原因となっていたが
上記各側によれば水滴は冷却部材を介して速やかに受け
部材に導かれて適宜処理されるので水滴落下に伴なう上
記問題は解決された。(Table-1) As can be seen from this (Table-1), a large amount of water is lost from the transfer paper S during fixing, and this becomes water droplets that fall onto the transfer paper and cause white spots and jams. However, according to each of the above-mentioned methods, the water droplets are quickly guided to the receiving member via the cooling member and are appropriately treated, so the above-mentioned problems associated with falling water droplets have been solved.
第３図は本発明を実施することのできる複写機の一例を
説明したものである。FIG. 3 illustrates an example of a copying machine in which the present invention can be implemented.
これによると、光源２０よりミラーＭ１を介して原稿２
１は先の照射を受ける。According to this, the light source 20 passes the document 2 through the mirror M1.
1 receives the previous irradiation.
原稿反射光はミラーＭ２． Ｍ３及び結像レンズ２２等
を経てベルト感光体２３上に結像露光される。The original reflected light is reflected by mirror M2. The light is imaged and exposed onto the belt photoreceptor 23 through the M3, the imaging lens 22, and the like.
ベルト感光体２３は予め帯電器２４により暗中にて一様
に帯電されており、上記結ａ露光により等電潜像が担持
される。The belt photoreceptor 23 is uniformly charged in advance by a charger 24 in the dark, and an isoelectric latent image is carried thereon by the a-condensation exposure.
この静電潜像は現像装置２４を通過する間に可視像化さ
れ、給紙装ｆｉ２５．２６等からタイミングを合わせて
送給されてくる転写紙Ｓにこの可視像は転写される。This electrostatic latent image becomes a visible image while passing through the developing device 24, and this visible image is transferred onto the transfer paper S fed at the same timing from the paper feed device fi25, 26, etc.
転写後の転写紙Ｓはコンベア２７を介して本発明に係る
定着装置６０を経て定着され、カール検出部２７を経て
！１１：紙トレイ２８に導かれる。After the transfer, the transfer paper S is transferred via the conveyor 27, passes through the fixing device 60 according to the present invention, is fixed, and passes through the curl detection section 27! 11: Guided to paper tray 28.
一方、ベルト感光体２３は上記転写後、クリーニング装
置２９にて残留ト・ナーを除去されて次のコピーに備え
られる。On the other hand, after the transfer, the belt photoreceptor 23 is cleaned of residual toner and toner by a cleaning device 29 and is ready for the next copy.
なお、両面コピーの場合には片面定着後再度裏面が転写
、定着後排紙トレイ２８に導かれる。In the case of double-sided copying, after one side is fixed, the back side is transferred and fixed again, and then guided to the paper discharge tray 28.
（効 果）
本発明によれば、定着時に生ずる水蒸気の結露による水
滴を速やかに転写紙に悪影響を与えない部位に導くこと
ができるので、転写紙への水滴付着を防止し、結局、白
抜けやジャム等を防止することができ好都合である。(Effects) According to the present invention, water droplets due to condensation of water vapor generated during fixing can be quickly guided to areas where they will not have a negative effect on the transfer paper, thereby preventing water droplets from adhering to the transfer paper, and eventually eliminating white spots. This is advantageous because it can prevent jams and the like.
第１図は本発明の一実施例を説明した定着装置の断面図
、第２図は本発明の他の実施例を説明した定着装置の要
部分解斜視図、第３図は本発明を適用した複写機の概略
構成を説明した図、第４図、第５図はそれぞ九従来技術
を説明した図である。
１・・・・定着ローラー、２・・・・加圧ローラー、１
０・・・・転写紙ガイ阻１１・・・・冷却部材、１３・
・・・受け部材、Ａ・・・・定着ニップ部。
第 ４ 図
俤 う 図FIG. 1 is a cross-sectional view of a fixing device illustrating one embodiment of the present invention, FIG. 2 is an exploded perspective view of essential parts of a fixing device illustrating another embodiment of the present invention, and FIG. 3 is an application of the present invention. Figures 4 and 5 are diagrams illustrating nine conventional techniques, respectively, illustrating the schematic configuration of a copying machine according to the present invention. 1... Fixing roller, 2... Pressure roller, 1
0...Transfer paper barrier 11...Cooling member, 13.
...Receiving member, A...Fixing nip part. Figure 4
Claims (1)
上の未定着トナーを熱定着する定着装置において、 上記ローラーが転写紙先端をくわえ始める定着ニップ部
を下流直後に設けた転写紙ガイド部材を通気自在に構成
し、このガイド部材の重力方向上側に冷却部材を配置し
、この冷却部材の下面を案内面として該冷却部材に付着
した水滴を受け部に導くようにしたことを特徴とする熱
定着装置。[Claims] In a fixing device that heats unfixed toner on the transfer paper by passing the transfer paper between a pair of heating rollers, a fixing nip portion where the roller starts gripping the leading edge of the transfer paper is provided immediately downstream. A cooling member is arranged above the guide member in the direction of gravity, and the lower surface of the cooling member is used as a guide surface to guide water droplets attached to the cooling member to a receiving part. A heat fixing device characterized by:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP30711987A JPH01147575A (en) | 1987-12-04 | 1987-12-04 | Heat fixing device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP30711987A JPH01147575A (en) | 1987-12-04 | 1987-12-04 | Heat fixing device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH01147575A true JPH01147575A (en) | 1989-06-09 |
Family
ID=17965257
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP30711987A Pending JPH01147575A (en) | 1987-12-04 | 1987-12-04 | Heat fixing device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH01147575A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1215541A2 (en) * | 2000-12-13 | 2002-06-19 | Heidelberger Druckmaschinen Aktiengesellschaft | Ventilated cleaning blade for fixing station in an image forming apparatus |
-
1987
- 1987-12-04 JP JP30711987A patent/JPH01147575A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1215541A2 (en) * | 2000-12-13 | 2002-06-19 | Heidelberger Druckmaschinen Aktiengesellschaft | Ventilated cleaning blade for fixing station in an image forming apparatus |
| EP1215541A3 (en) * | 2000-12-13 | 2006-02-08 | Eastman Kodak Company | Ventilated cleaning blade for fixing station in an image forming apparatus |
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