JPH04129958A - Paper discharge mechanism for electrophotographic device - Google Patents
Paper discharge mechanism for electrophotographic deviceInfo
- Publication number
- JPH04129958A JPH04129958A JP24696490A JP24696490A JPH04129958A JP H04129958 A JPH04129958 A JP H04129958A JP 24696490 A JP24696490 A JP 24696490A JP 24696490 A JP24696490 A JP 24696490A JP H04129958 A JPH04129958 A JP H04129958A
- Authority
- JP
- Japan
- Prior art keywords
- paper
- paper discharge
- roller
- rollers
- movable piece
- 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
- 238000007599 discharging Methods 0.000 abstract 1
- 239000004033 plastic Substances 0.000 description 4
- 238000010521 absorption reaction Methods 0.000 description 3
- 241000257465 Echinoidea Species 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 239000004809 Teflon Substances 0.000 description 1
- 229920006362 Teflon® Polymers 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 229910052736 halogen Inorganic materials 0.000 description 1
- 150000002367 halogens Chemical class 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
Landscapes
- Delivering By Means Of Belts And Rollers (AREA)
- Separation, Sorting, Adjustment, Or Bending Of Sheets To Be Conveyed (AREA)
- Feeding Of Articles By Means Other Than Belts Or Rollers (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明はレーザプリンタ、電子複写機等の電子写真装置
に係り、特に種々の紙厚、サイズ、吸湿性能等を有する
多様紙にも良好な性能を有する排紙機構に関する。[Detailed Description of the Invention] [Industrial Field of Application] The present invention relates to electrophotographic devices such as laser printers and electronic copying machines, and in particular, to electrophotographic devices such as laser printers and electronic copying machines, and in particular, to an electrophotographic device that is suitable for use with various papers having various thicknesses, sizes, moisture absorption properties, etc. The present invention relates to a paper ejecting mechanism with high performance.
〔従来の技術］
従来の装置は紙の後端か排紙駆動ローラと排紙従動ロー
ラの接触部を通過した後に紙の搬送駆動力がなくなって
も紙を排紙ｌ・レイ」二に突き落とすことができる様に
する為に排紙駆動ローラの端部にその外径が排紙駆動ロ
ーラより大きくその外周に凹凸状の歯を設けたけり出し
ローラ部を設けてこれにより紙後端部にけり出し力を与
え排紙トレイ」二に突き落とす構成となっていた。[Prior art] Conventional devices push the paper onto the paper ejection tray even if the paper conveyance driving force is lost after the trailing edge of the paper passes through the contact area between the paper ejection drive roller and the paper ejection driven roller. In order to make this possible, a kick-out roller part is provided at the end of the paper ejection drive roller, the outer diameter of which is larger than that of the paper ejection drive roller, and which has uneven teeth on its outer periphery. It was designed to apply kicking force and push the paper into the paper output tray.
［発明が解決しようとする課題１
」１記従来技術の問題点について第４図を用いて説明す
る。これは排紙機構部の断面構造を示すものである。ま
ず第］に葉書を通紙する場合定着器により発生するカー
ルを矯正する為に排紙駆動ローラ１９の外周にそって葉
書幅でカール取りカイト２３を設ける必要かあるが、こ
れを設けるとこのカール取りカイト幅には寸法」二従来
のけり出しローラは設けられない。そうすると葉書のよ
うな小サイズ紙を通紙させると紙後端が図に示す様に排
紙駆動ローラと排紙従動ローラの接触部を通過して紙の
搬送駆動力かなくなると４１１紙駆動ローラ］９の外周
」二に紙後端が静止したまま止まってしまい排紙トレイ
」二に突き落とすことかできなくなる。こうなると排紙
ジャム、排紙不整合、Ｊｊ１紙容紙工量不足重大欠陥を
ひきおこすことになる。第２図は薄紙を使用された場合
である。薄紙は砥削性が非常に小さい為、けり出しロー
ラがあってもそれに引っかかった紙後端部が局部的に折
れてしまい紙への突き出し力が作用しなく小サイズ紙と
同様に排紙かできない。第３に也の中には吸湿しやすい
紙がある。このような紙は吸湿すると紙の先後端がカー
ルしてしまう。すると紙後端が排紙ローラ部を通過した
ときにもけり出しローラへのひっかかりができず排紙が
できない。以」二説明した問題点かある。[Problem to be Solved by the Invention 1] The problems of the prior art described in 1 will be explained using FIG. 4. This shows the cross-sectional structure of the paper ejection mechanism section. First of all, when passing postcards, it is necessary to provide a curl removal kite 23 along the outer periphery of the paper ejection drive roller 19 with the width of the postcard in order to correct curls caused by the fixing device. The width of the curl removal kite is 2" in width, and a conventional kicking roller is not provided. Then, when a small size paper such as a postcard is passed through, the trailing edge of the paper passes through the contact area between the paper ejection drive roller and the paper ejection driven roller as shown in the figure, and when the paper conveyance driving force is lost, the 411 paper drive roller ] The trailing edge of the paper remains stationary at the outer periphery of paper 9, making it impossible to push it down into the paper output tray. If this happens, serious defects such as paper jam, paper mismatch, and insufficient paper work for Jj1 paper will occur. Figure 2 shows the case where thin paper is used. Thin paper has very low abrasiveness, so even if there is a push-out roller, the trailing edge of the paper caught by the push-out roller will break locally, and the push-out force will not act on the paper, so the paper will not be ejected in the same way as small-sized paper. Can not. Thirdly, there is paper in the paper that easily absorbs moisture. When such paper absorbs moisture, the leading and trailing edges of the paper curl. Then, even when the trailing edge of the paper passes through the paper ejection roller section, it cannot be caught on the kick-out roller and the paper cannot be ejected. There are some problems as explained above.
［課題を解決するための手段］
」１記目的を達成する為に定着後の記録媒体（紙）を本
体外に排出させる機能を有する１対の排紙部動ローラと
排紙従動ローラを設け、該排紙ローラ対の出口に転角自
在な可動片を設けたものである。[Means for Solving the Problems] In order to achieve the purpose described in 1., a pair of paper ejecting unit moving rollers and a paper ejecting driven roller are provided which have the function of ejecting the recording medium (paper) after fixing to the outside of the main body. , a movable piece is provided at the exit of the paper ejection roller pair.
また」−記転角自在な可動片はある適切な重Ｑｌを有し
、紙後端が排紙ローラ対の接触部を通過したときに該可
動片が紙後端を排紙駆動ローラに押し伺（づる様構成し
たものである。In addition, the movable piece that can freely write and transfer has a certain appropriate weight Ql, and when the trailing edge of the paper passes the contact part of the pair of paper ejection rollers, the movable piece pushes the trailing edge of the paper against the paper ejection drive roller. It was composed by Zuru-sama.
〔作用］
前記転角自在な可動片は紙後端が排紙ローラ対の接触部
を通過したときに紙後端を駆動排紙ローラの外周に押し
付ける様に作用する。それによって紙に排紙トレイ」二
への突き出し力が発生する為、従来のけり出しローラで
は不可能であった小サイズ紙、薄紙、吸湿によるカール
紙等の多様紙の排紙が可能となる。[Function] The rotatable movable piece acts so as to press the trailing edge of the paper against the outer periphery of the driving paper discharge roller when the trailing edge of the paper passes the contact portion of the pair of paper discharge rollers. This generates a force for ejecting the paper toward the paper ejection tray 2, making it possible to eject a variety of papers, such as small-sized paper, thin paper, and paper curled due to moisture absorption, which was impossible with conventional ejection rollers. .
以下、本発明の一実施例を第１図、第２図、第３図を用
いて説明する。まず最初に第２図を用いて本発明を実施
したレーザプリンタの概略構造について説明する。外周
に感光材！、：１を塗布したドラム６の周辺には帯電器
７、光学ユニット８、現像器９、転写・除電器１０、ク
リーニングユニット１１、イレーズランプ１２が配設さ
れ、電子写真プロセスを行なうようになっている。１３
は用紙カセットであり、１４は定着ユニット、１５は拮
゛紙トレイである。第３図は定着器と排紙部の配置を表
わす断面図を示す。ヒートローラ１６はバックアップロ
ーラ１７と一対で使用されて定着器１４を構成する。す
なわち中空のアルミニウム素管の表面のテフロンコーテ
ィングを施しであるヒートローラ］６の内部中央にはハ
ロゲンランプ１８等の熱源か配設され、トナーの定着に
必要な熱が与えられる。一方、バックアップローラ１７
はその表面がゴム層で被覆されており、ヒートローラ１
６に向かって一定圧力で押し付けられてトナーの定着に
必要な加圧力を確保すると同時に、前記ゴム層が加圧力
により弾性変形してヒートローラ］６との接触領域を形
成し定着に必要な時間も確保できる構成となっている。An embodiment of the present invention will be described below with reference to FIGS. 1, 2, and 3. First, the schematic structure of a laser printer embodying the present invention will be explained using FIG. 2. Photosensitive material on the outer periphery! A charger 7, an optical unit 8, a developer 9, a transfer/static eliminator 10, a cleaning unit 11, and an erase lamp 12 are arranged around the drum 6 coated with . ing. 13
1 is a paper cassette, 14 is a fixing unit, and 15 is a paper tray. FIG. 3 shows a sectional view showing the arrangement of the fixing device and the paper discharge section. The heat roller 16 and a backup roller 17 are used as a pair to constitute the fixing device 14. A heat source such as a halogen lamp 18 is disposed in the center of the heat roller 6, which is a hollow aluminum tube whose surface is coated with Teflon, and provides the heat necessary for fixing the toner. On the other hand, the backup roller 17
The surface is covered with a rubber layer, and the heat roller 1
At the same time, the rubber layer is elastically deformed by the pressing force to form a contact area with the heat roller 6, and the time required for fixing is maintained. The structure is designed to ensure that
駆動排紙ローラ１９は従動排紙ローラ２０と一対で使用
され、定着器］４で定着後に送り出された紙をローラ間
に挾み込み搬送力を与えることにより、排紙トレイ１５
上に紙を排紙する役目をする。ここで回転駆動力を与え
られるのはゴムで構成された駆動排紙ローラであり従動
排紙ローラ２０は従動ローラであり、プラスチック等で
構成されており、このローラへの押圧力のみかばね（図
示せず）等により付与される構成となっている。排紙ガ
イド（シタ）２１と排紙ガイド（ウニ）２２は概ね定着
器】４と排紙部間に配設され、定着器１４と排紙部間に
配設され、定着器１４で送り出された紙の先端を駆動排
紙ローラ１９と従動排紙ローラ２０の接合部に導く役目
をする鋼板製のガイド板である。２３は排紙ガイド（ウ
ニ）２２に一体に取り付けられ、駆動排紙ローラ１９の
外周に沿ったガイド部２３ａを有する葉書のカール取り
ガイドである。この葉書のカール取りガイド２３により
、定着器１４通過時にヒートローラ１６側（すなわち上
側）にそる様に発生する葉書のカールか排紙部通過時に
は、逆に下側にカールさせようとする強制力により、前
記葉書のカールが相殺されて、結果として排紙ｌ・レイ
１５上に排紙された葉書のカール量が非常に小さく （
約５ｍｍ以下）に抑えられるものである。The driving paper ejection roller 19 is used as a pair with a driven paper ejection roller 20, and the paper sent out after fixing in the fixing device] 4 is sandwiched between the rollers and conveyed by applying a conveying force to the paper ejection tray 15.
It serves to eject paper onto the top. Here, the rotational driving force is applied to a driving paper ejection roller made of rubber, and the driven paper ejection roller 20 is a driven roller made of plastic or the like, and the only pressure force applied to this roller is a spring (Fig. (not shown) etc. A paper ejection guide (shita) 21 and a paper ejection guide (sea urchin) 22 are generally arranged between the fixing device 4 and the paper ejection section, and are arranged between the fixing device 14 and the paper ejection section, so that the paper is sent out by the fixing device 14. This guide plate is made of a steel plate and serves to guide the leading edge of the paper to the joint between the drive paper discharge roller 19 and the driven paper discharge roller 20. A postcard decurling guide 23 is integrally attached to the paper ejection guide (sea urchin) 22 and has a guide portion 23a along the outer periphery of the drive paper ejection roller 19. This postcard curl removal guide 23 causes the postcard to curl toward the heat roller 16 side (i.e., upward) when it passes through the fixing device 14, or force it to curl downward when it passes through the paper ejection section. As a result, the curl of the postcard is canceled out, and as a result, the amount of curl of the postcard discharged onto the discharge paper tray 15 is very small (
(approximately 5 mm or less).
次に本発明の主題である排紙機構の構造を第１図を用い
て説明する。この図は第２図に示ずレーザプリンタをへ
方向から見たものである。排紙駆動シャフト３０１にゴ
ム製の排紙駆動シャフト１９が図に示すように合泪６ケ
一体に取り付けられるようになっている。そしてそれぞ
れの排紙駆動ローラ１９にはプラスチック製の排紙従動
ローラ２０がばね（図示せず）により押じイ」けられて
いる。Next, the structure of the paper ejecting mechanism, which is the subject of the present invention, will be explained using FIG. This figure is not shown in FIG. 2, but is a view of the laser printer from the opposite direction. Six rubber paper ejection drive shafts 19 are integrally attached to the paper ejection drive shaft 301 as shown in the figure. A plastic paper discharge driven roller 20 is pushed onto each paper discharge drive roller 19 by a spring (not shown).
そして種々のサイズの紙が使用されても排紙力か与えら
れる様になっている。３１は６ケの排紙駆動ローラのう
ち外側の４ケに一体に取り伺けられプラスチック製のけ
り出しローラである。このけり出しローラの外周には歯
状の凹凸が設けられており、紙の後端が排紙駆動ローラ
１９と排紙従動ローラ２０の接触部を通過してしまって
紙への駆動力かなくなった最後に紙にけり出し力を与え
紙を排紙トレイ上へ突き落す役目をするものであり従来
一般的に使用されている方法である。次に本発明のポイ
ントであるけり出し可動片３２について説明する。この
けり出し可動片３２は葉Ｊトのカール取りカイト２３な
一端を回転自在に支持され、他端か自重で中央の２個の
排紙駆動ローラにたれ下がる様に取り付けられている。Even if paper of various sizes is used, the paper discharge force can be applied. Reference numeral 31 denotes a plastic kick-off roller that is integrally attached to the outer four of the six paper ejection drive rollers. The outer periphery of this kick-out roller is provided with tooth-shaped unevenness, so that the trailing edge of the paper passes through the contact area between the paper ejection drive roller 19 and the paper ejection driven roller 20, and the driving force to the paper is lost. This is a method that has been commonly used in the past, and finally applies a force to the paper to push it down onto the paper discharge tray. Next, the movable piece 32, which is the key point of the present invention, will be explained. The movable kicking piece 32 is rotatably supported at one end of the sheet curl removing kite 23, and is attached so that the other end hangs down by its own weight to the two central paper discharge drive rollers.
なおこのけり出し可動片３２はある重量を有していれば
金属であってもプラスチックであっても良い。Note that this movable piece 32 may be made of metal or plastic as long as it has a certain weight.
次に第５図と第６図を用いてその動作について説明する
。第５図は紙が排紙ローラ部を通過しているときを示し
ており第６図は紙の後端が排紙ローラ部を抜けた瞬間の
状態を示している。まず最初に第５図を用いて紙か排紙
ローラ部を通過しているときを説明する。この状態では
紙に排紙力が十分与えられている為、その紙の突き出し
力によりけり出し可動片３２が紙によって１−の方向に
転角され紙２７の表面とけり出し可動片が摺擦しながら
従来通り排紙が行なわれる。次に第６図を用いて紙の後
端が排紙ローラ部を抜けた瞬間の動作について説明する
。この場合には紙の後端が排紙駆動ローラ１９と排紙従
動ローラ２０の接触部を抜ける為、紙に対する駆動力か
なくなってしまう。Next, the operation will be explained using FIGS. 5 and 6. FIG. 5 shows the paper passing through the paper ejection roller section, and FIG. 6 shows the state at the moment when the rear end of the paper passes through the paper ejection roller section. First, using FIG. 5, a description will be given of the case where the paper passes through the paper ejection roller section. In this state, sufficient paper ejecting force is applied to the paper, so the paper pushes out the movable piece 32 by turning it in the 1- direction, causing the surface of the paper 27 and the movable piece to rub against each other. However, the paper is ejected as before. Next, referring to FIG. 6, the operation at the moment when the trailing edge of the paper passes through the paper ejection roller section will be described. In this case, the trailing edge of the paper passes through the contact portion between the paper discharge drive roller 19 and the paper discharge driven roller 20, so that the driving force for the paper is lost.
この状態では紙の突き出し力がなくなる為紙２７は排紙
駆動ローラ１９の外周上にととまろうとする。しかし紙
の突き出し力がなくなればけり出し可動片３２か自重に
より下方向に転角し紙後端を排紙駆動ローラ外周」二に
押しイ」ける。したがって回転している排紙駆動ローラ
１９の駆動力により紙が排紙トレイ」二に突き落とされ
ることになる。In this state, the paper 27 tends to stay on the outer periphery of the paper ejection drive roller 19 because the paper ejecting force is lost. However, when the paper ejecting force is removed, the movable ejecting piece 32 turns downward due to its own weight and pushes the trailing edge of the paper toward the outer periphery of the ejecting drive roller. Therefore, the driving force of the rotating paper ejection drive roller 19 causes the paper to be pushed down into the paper ejection tray 2.
本発明によれば、小サイズ紙、薄紙、あるいは紙の後端
がカールした紙などのように従来のけり出しローラでは
排紙できなかった紙でも良好に排紙することかできるこ
とになる。According to the present invention, even paper that could not be ejected using conventional kick-out rollers, such as small-sized paper, thin paper, or paper with a curled trailing edge, can be ejected satisfactorily.
［発明の効果］
本発明によれば、小サイズ紙や薄紙あるいは紙の吸湿に
よるカールが大きい紙が使用された場合でも良好な排紙
性能を得ることができるので多様紙対応のレーザプリン
タあるいは複写機等の電子写真装置を提供することがで
きる。[Effects of the Invention] According to the present invention, it is possible to obtain good paper ejection performance even when small-sized paper, thin paper, or paper with large curls due to moisture absorption is used, so that it is possible to obtain a laser printer or copying machine that is compatible with a variety of paper types. It is possible to provide an electrophotographic device such as a machine.
第１図は本発明を実施するレーザプリンタの排紙機構を
示す外観構造図、第２図は本発明を実施するレーザプリ
ンタの全体を示す構造図、第３図は本発明を実施するレ
ーザプリンタの定着器および排紙機構部を示す断面図、
第４図は従来の排紙機構を示す断面図、第５図および第
６図は本発明の詳細な説明する為の排紙機構部の断面図
である。Fig. 1 is an external structural diagram showing a paper ejection mechanism of a laser printer embodying the present invention, Fig. 2 is a structural diagram showing the entire structure of a laser printer embodying the present invention, and Fig. 3 is a laser printer embodying the present invention. A cross-sectional view showing the fixing device and paper ejection mechanism of the
FIG. 4 is a sectional view showing a conventional paper ejecting mechanism, and FIGS. 5 and 6 are sectional views of the paper ejecting mechanism for explaining the present invention in detail.
Claims (1)
電子複写機等の電子写真装置において、定着後の記録媒
体を本体外に排出させる機能を有する１対の排紙駆動ロ
ーラと排紙従動ローラを設け、該排紙ローラ対の出口に
転角自在な可動片を設けたことを特徴とする電子写真装
置の排紙機構。 ２、請求項第１項において、前記転角自在な可動片はあ
る重量を有し、記録紙後端が排紙ローラ対の接触部を通
過したとき該可動片が紙後端を排紙駆動ローラに押し付
ける様構成したことを特徴とする電子写真装置の排紙機
構。[Claims] 1. A laser printer that uses cut paper as a recording medium;
In an electrophotographic apparatus such as an electronic copying machine, a pair of paper ejection driving roller and paper ejection driven roller having a function of ejecting a recording medium after fixing to the outside of the main body is provided, and the exit of the paper ejection roller pair is freely rotatable. A paper ejecting mechanism for an electrophotographic device, characterized in that a movable piece is provided. 2. In claim 1, the movable piece that can be rotated has a certain weight, and when the trailing edge of the recording paper passes the contact portion of the pair of paper ejection rollers, the movable piece drives the trailing edge of the paper to eject the paper. A paper ejection mechanism for an electrophotographic device, characterized in that the paper ejection mechanism is configured to be pressed against a roller.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP24696490A JPH04129958A (en) | 1990-09-19 | 1990-09-19 | Paper discharge mechanism for electrophotographic device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP24696490A JPH04129958A (en) | 1990-09-19 | 1990-09-19 | Paper discharge mechanism for electrophotographic device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH04129958A true JPH04129958A (en) | 1992-04-30 |
Family
ID=17156344
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP24696490A Pending JPH04129958A (en) | 1990-09-19 | 1990-09-19 | Paper discharge mechanism for electrophotographic device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH04129958A (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH06336361A (en) * | 1993-05-26 | 1994-12-06 | Kobayashi Seisakusho:Kk | Sheet object input device |
| JP2009202965A (en) * | 2008-02-26 | 2009-09-10 | Brother Ind Ltd | Image forming device |
| JP2011011855A (en) * | 2009-07-01 | 2011-01-20 | Oki Electric Industry Co Ltd | Medium carrying device |
| JP2014141350A (en) * | 2014-04-01 | 2014-08-07 | Oki Data Corp | Medium loading device and image forming device |
| CN104925566A (en) * | 2014-03-17 | 2015-09-23 | 柯尼卡美能达办公***研发（无锡）有限公司 | Paper discharge mechanism, post-processing device, and image forming device and system |
| US9199817B2 (en) | 2010-08-10 | 2015-12-01 | Oki Data Corporation | Medium discharging apparatus and image forming apparatus |
-
1990
- 1990-09-19 JP JP24696490A patent/JPH04129958A/en active Pending
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH06336361A (en) * | 1993-05-26 | 1994-12-06 | Kobayashi Seisakusho:Kk | Sheet object input device |
| JP2009202965A (en) * | 2008-02-26 | 2009-09-10 | Brother Ind Ltd | Image forming device |
| JP4697244B2 (en) * | 2008-02-26 | 2011-06-08 | ブラザー工業株式会社 | Image forming apparatus |
| JP2011011855A (en) * | 2009-07-01 | 2011-01-20 | Oki Electric Industry Co Ltd | Medium carrying device |
| US9199817B2 (en) | 2010-08-10 | 2015-12-01 | Oki Data Corporation | Medium discharging apparatus and image forming apparatus |
| CN104925566A (en) * | 2014-03-17 | 2015-09-23 | 柯尼卡美能达办公***研发（无锡）有限公司 | Paper discharge mechanism, post-processing device, and image forming device and system |
| JP2014141350A (en) * | 2014-04-01 | 2014-08-07 | Oki Data Corp | Medium loading device and image forming device |
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