JPH0546040A - Heating roller fixing device - Google Patents
Heating roller fixing deviceInfo
- Publication number
- JPH0546040A JPH0546040A JP3202966A JP20296691A JPH0546040A JP H0546040 A JPH0546040 A JP H0546040A JP 3202966 A JP3202966 A JP 3202966A JP 20296691 A JP20296691 A JP 20296691A JP H0546040 A JPH0546040 A JP H0546040A
- Authority
- JP
- Japan
- Prior art keywords
- pair
- fixing
- paper
- rollers
- 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.)
- Pending
Links
Landscapes
- Paper Feeding For Electrophotography (AREA)
- Delivering By Means Of Belts And Rollers (AREA)
- Separation, Sorting, Adjustment, Or Bending Of Sheets To Be Conveyed (AREA)
- Fixing For Electrophotography (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】この発明は画像形成装置の加熱ロ
ーラ定着装置に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heating roller fixing device for an image forming apparatus.
【０００２】[0002]
【従来の技術】従来の画像形成装置の加熱ローラ定着装
置は図２に示すようであって、排紙搬送ローラ対６のニ
ップ部は定着ローラ１と加圧ローラ２のニップ部の接線
方向より上方に位置する構成となっている。なお図２に
おいて３は入力ガイド板、４はサーミスタ、５は転写
紙、７はトナーをそれぞれ示す。2. Description of the Related Art A conventional heating roller fixing device of an image forming apparatus is as shown in FIG. 2, and a nip portion of a pair of paper discharging and conveying rollers 6 is in a tangential direction of a nip portion between a fixing roller 1 and a pressure roller 2. It is located above. In FIG. 2, 3 is an input guide plate, 4 is a thermistor, 5 is transfer paper, and 7 is toner.
【０００３】[0003]
【発明が解決しようとする課題】前記のような従来の定
着装置、特にフルカラー複写機においては、従来の白黒
複写機と異り、写真や絵画の原稿を複写することが多く
画像が用紙のほぼ全面に存在することになる。そのため
定着、加圧ローラ対に転写紙がくわえ込まれると、図３
に示すように波打ち状のしわ９が発生し、定着ローラへ
の接触時間に差を生じることによってニップ部後の接触
による熱供給を受けて、図４に示すように画像中央付近
に八つ手状の光沢度の高い部分が発生し、従来気付きに
くかった画像上の光沢むらが顕著に現われてきて、画像
品質が劣るという問題がある。Unlike the conventional black-and-white copying machine, the above-mentioned conventional fixing device, particularly the full-color copying machine, often copies originals of photographs and paintings, and images are almost printed on paper. It will exist on the entire surface. Therefore, when the transfer paper is gripped by the pair of fixing and pressure rollers, as shown in FIG.
As shown in FIG. 4, a wavy wrinkle 9 is generated, and the contact time to the fixing roller is different, so that heat is supplied by the contact after the nip portion, and as shown in FIG. Has a problem in that the image quality is inferior because the uneven glossiness on the image, which is conventionally hard to notice, appears remarkably.
【０００４】そこでこの発明の目的は、前記のような従
来の定着装置のもつ問題を解消し、画像上に光沢むらを
生ずることがなく、品質の良い画像が得られる加熱ロー
ラ定着装置を提供するにある。SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a heating roller fixing device which solves the problems of the conventional fixing device as described above and can obtain a high quality image without causing uneven gloss on the image. It is in.
【０００５】[0005]
【課題を解決するための手段】この発明は前記のような
目的を達成するために、定着後の排紙搬送ローラ対のニ
ップ部の接線方向が、定着、加圧ローラ対のニップ部の
接線方向以下に位置するように排紙搬送ローラ対を配設
したものである。また前記排紙搬送ローラ対の線速度が
定着ローラの線速度より大であるように構成されている
ものである。In order to achieve the above-mentioned object, the present invention has a tangential direction of a nip portion of a pair of sheet discharging and conveying rollers after fixing in a tangential line of a nip portion of a fixing and pressure roller pair. A pair of paper discharging and conveying rollers are arranged so as to be positioned below the direction. Further, the linear velocity of the pair of sheet discharging and conveying rollers is configured to be higher than the linear velocity of the fixing roller.
【０００６】[0006]
【作用】前記のようなこの発明において、熱定着されて
排出された転写紙が排紙搬送ローラ対にくわえ込まれた
時、定着、加圧ローラ対のニップ部の接線方向より下方
に引っ張られた状態に保持されて、定着ローラへの接触
時間に差を生ずることなく搬送される。In the present invention as described above, when the transfer sheet that has been heat-fixed and discharged is gripped by the pair of discharge conveyance rollers, it is pulled downward from the tangential direction of the nip portion of the fixing and pressure roller pair. In this state, the sheet is conveyed without any difference in contact time with the fixing roller.
【０００７】[0007]
【実施例】以下添付の図面を参照してこの発明を説明す
る。図面に示すこの発明において、前記従来のものと同
様の部分には同一の符号を引用して説明を省略し主とし
て異る部分について説明する。DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the accompanying drawings. In the present invention shown in the drawings, the same parts as those of the conventional one are referred to by the same numerals, and the description thereof will be omitted.
【０００８】この発明の実施例を示す図１において、排
紙搬送ローラ対６は、そのニップ部の接線方向が、定着
ローラ１と加圧ローラ２のニップ部の接線方向より下方
になるように位置して配設されており、また排紙搬送ロ
ーラ対６の線速度は定着ローラ１の線速度より５〜10％
程度速くなるように構成されている。この構成された定
着装置において、熱定着が終った転写紙５は分離爪10に
より定着ローラ１から剥離され、排紙ガイド板８に沿っ
て搬送され排紙搬送ローラ対６にくわえ込まれる。前記
のように排紙搬送ローラ対６の線速度は定着ローラ１の
それより大きいので、転写紙５はゆるみなく引っ張られ
た状態となりながら搬送される。そしてその方向は定着
ローラ１と加圧ローラ２のニップ部の接線方向より下方
に排紙搬送ローラ対６が設けられているので角度θ°だ
け下方に向かうようになる。従って、転写紙６は紙の波
打ち状のしわやカールを起すことがないので、それらの
部分が定着ローラに接することがなく、定着加熱時間に
差を生じることがないので、定着ローラ１と加圧ローラ
２とのニップ部加熱後の接触による熱供給を受けること
なく転写紙５は搬送される。In FIG. 1 showing the embodiment of the present invention, the tangential direction of the nip portion of the pair of sheet discharging and conveying rollers 6 is lower than the tangential direction of the nip portion between the fixing roller 1 and the pressure roller 2. The linear velocity of the pair of sheet discharging and conveying rollers 6 is 5 to 10% of the linear velocity of the fixing roller 1.
It is configured to be moderately fast. In the fixing device configured as described above, the transfer paper 5 that has been thermally fixed is separated from the fixing roller 1 by the separation claw 10, is conveyed along the paper discharge guide plate 8, and is gripped by the paper discharge conveyance roller pair 6. As described above, since the linear velocity of the pair of paper discharge conveyance rollers 6 is higher than that of the fixing roller 1, the transfer paper 5 is conveyed while being pulled without looseness. Further, since the direction of the paper discharge / conveyance roller pair 6 is provided below the tangential direction of the nip portion between the fixing roller 1 and the pressure roller 2, the direction is downward by the angle θ °. Therefore, since the transfer paper 6 does not cause wavy wrinkles or curl of the paper, those parts do not come into contact with the fixing roller, and there is no difference in the heating time for fixing. The transfer paper 5 is conveyed without being supplied with heat by contact with the pressure roller 2 after heating the nip portion.
【０００９】[0009]
【発明の効果】この発明は前記のようであって排紙搬送
ローラ対が下方にθ°の角度だけ転写紙を引っ張って搬
送するので、定着ローラを出た後、定着ローラに転写紙
が接触することなく剥離されて搬送されるので画面上に
光沢むらが発性することなく、品質の良い画像が得られ
るという効果がある。As described above, according to the present invention, since the pair of paper discharging and conveying rollers pulls and conveys the transfer sheet downward by an angle of θ °, the transfer sheet comes into contact with the fixing roller after leaving the fixing roller. Since it is peeled off and conveyed without being performed, there is an effect that a high quality image can be obtained without causing uneven gloss on the screen.
【図１】この発明の実施例を示す概略正面図である。FIG. 1 is a schematic front view showing an embodiment of the present invention.
【図２】従来の加熱ローラ定着装置を示す概略正面図で
ある。FIG. 2 is a schematic front view showing a conventional heating roller fixing device.
【図３】同上の定着装置における波打ち状のしわの発生
状態を示す図である。FIG. 3 is a diagram showing a state where wavy wrinkles are generated in the above fixing device.
【図４】同上の光沢むらの状態を示す図である。FIG. 4 is a diagram showing a state of uneven gloss in the same as above.
１ 定着ローラ ２ 加圧ローラ ４ サーミスタ ５ 転写紙 ６ 排紙搬送ローラ対 ８ 排紙ガイド
板 ９ 分離爪 10 波打ち状の
しわ 11 光沢むら 12 画像1 Fixing Roller 2 Pressure Roller 4 Thermistor 5 Transfer Paper 6 Paper Ejection Conveying Roller Pair 8 Paper Ejection Guide Plate 9 Separation Claw 10 Rippled Wrinkle 11 Luster Matter 12 Image
Claims (2)
に圧接する弾性体層を有する加圧ローラとが互に押圧し
て当接するニップ部を通過させてトナー像を転写材に定
着させる画像形成装置において、定着後の排紙搬送ロー
ラ対のニップ部の接線方向が、定着、加圧ローラ対のニ
ツプ部の接線方向以下に位置するように前記排紙搬送ロ
ーラ対を配設したことを特徴とする加熱ローラ定着装
置。1. An image forming method for fixing a toner image onto a transfer material by passing through a nip portion where a fixing roller having a heat source inside and a pressure roller having an elastic layer in pressure contact with each other pass through the nip portion. In the apparatus, the pair of discharge conveyance rollers is arranged such that the tangential direction of the nip portion of the discharge conveyance roller pair after fixing is located below the tangential direction of the nip portion of the fixing and pressure roller pair. And heating roller fixing device.
の線速度より大である請求項１の定着装置。2. The fixing device according to claim 1, wherein the linear velocity of the pair of sheet discharging and conveying rollers is higher than the linear velocity of the fixing roller.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3202966A JPH0546040A (en) | 1991-08-13 | 1991-08-13 | Heating roller fixing device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3202966A JPH0546040A (en) | 1991-08-13 | 1991-08-13 | Heating roller fixing device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0546040A true JPH0546040A (en) | 1993-02-26 |
Family
ID=16466117
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3202966A Pending JPH0546040A (en) | 1991-08-13 | 1991-08-13 | Heating roller fixing device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0546040A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1332271C (en) * | 2003-02-10 | 2007-08-15 | 兄弟工业株式会社 | Heat-fixing unit and imaging apparatus |
| CN103068704A (en) * | 2010-08-25 | 2013-04-24 | 夏普株式会社 | Recording material conveyance apparatus, and image forming apparatus |
| US11520270B2 (en) | 2019-03-14 | 2022-12-06 | Hewlett-Packard Development Company, L.P. | Imaging system with gloss treatment device |
-
1991
- 1991-08-13 JP JP3202966A patent/JPH0546040A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1332271C (en) * | 2003-02-10 | 2007-08-15 | 兄弟工业株式会社 | Heat-fixing unit and imaging apparatus |
| CN103068704A (en) * | 2010-08-25 | 2013-04-24 | 夏普株式会社 | Recording material conveyance apparatus, and image forming apparatus |
| CN103068704B (en) * | 2010-08-25 | 2015-07-22 | 夏普株式会社 | Recording material conveyance apparatus, and image forming apparatus |
| US11520270B2 (en) | 2019-03-14 | 2022-12-06 | Hewlett-Packard Development Company, L.P. | Imaging system with gloss treatment device |
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