JPH04204874A - Electrophotographic printer - Google Patents
Electrophotographic printerInfo
- Publication number
- JPH04204874A JPH04204874A JP33768690A JP33768690A JPH04204874A JP H04204874 A JPH04204874 A JP H04204874A JP 33768690 A JP33768690 A JP 33768690A JP 33768690 A JP33768690 A JP 33768690A JP H04204874 A JPH04204874 A JP H04204874A
- Authority
- JP
- Japan
- Prior art keywords
- grid
- cleaning member
- cleaning
- brush
- electrophotographic printing
- 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
- 238000004140 cleaning Methods 0.000 claims abstract description 71
- 108091008695 photoreceptors Proteins 0.000 claims description 25
- 238000007789 sealing Methods 0.000 claims description 5
- 239000002184 metal Substances 0.000 claims description 4
- 238000009825 accumulation Methods 0.000 abstract description 3
- 239000000126 substance Substances 0.000 abstract description 2
- 150000002500 ions Chemical class 0.000 description 3
- 239000000356 contaminant Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005299 abrasion Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
Landscapes
- Electrostatic Charge, Transfer And Separation In Electrography (AREA)
Abstract
Description
【発明の詳細な説明】
本発明は、コロナ放電装置の清掃機構を有する電子写真
印刷装置に関するものである。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an electrophotographic printing apparatus having a cleaning mechanism for a corona discharge device.
以下従来例を図面を参照して説明する。 A conventional example will be explained below with reference to the drawings.
第４．５図はグリッド清掃直後、直前のグリッドの状態
及び感光体帯電電位の様子を示した図である。FIG. 4.5 is a diagram showing the state of the grid and the charged potential of the photoreceptor immediately before and after cleaning the grid.
電子写真印刷装置においては、感光体上に均一な帯電電
位を与える必要があるため、感光体表面電位を一定に制
御できるスコロトロン帯電装置が広く用いられている。In electrophotographic printing apparatuses, it is necessary to apply a uniform charging potential to a photoreceptor, so a scorotron charging device that can control the surface potential of the photoreceptor to a constant level is widely used.
スコロトロン帯電装置は、一般にコロナ放電を発生させ
るコロナワイヤ３と、シールドケース５と、感光体１へ
の流入電流を制御するグリッド２から構成されており、
グリッド２は感光体１と１〜２ＩＩＩＩ＋程度と極めて
接近して配設されている。A scorotron charging device generally includes a corona wire 3 that generates corona discharge, a shield case 5, and a grid 2 that controls the current flowing into the photoreceptor 1.
The grid 2 is disposed very close to the photoreceptor 1 by about 1 to 2III+.
コロナワイヤ３に−５〜−８ｋＶ程度の高電圧を印加し
て発生されたコロナイオン流は、グリッド２が有する電
位により感光体１への流入量が制御され、第４図に示す
如く感光体１が均一に帯電される。このため、グリッド
２上にコロナイオンの流れ込みを妨げる様なトナー汚れ
などが付着すると、第５図に示す如く汚れ付着部分りの
グリッド２へのコロナイオン流の流れ込みが出来なくな
り、該汚れ付着部分りに対向した感光体１の帯電電位が
第５図に示す如く上昇してしまう。The amount of corona ion flow generated by applying a high voltage of about -5 to -8 kV to the corona wire 3 into the photoreceptor 1 is controlled by the potential of the grid 2, and the flow of corona ions into the photoreceptor 1 as shown in FIG. 1 is uniformly charged. Therefore, if toner dirt or the like that obstructs the flow of corona ions adheres to the grid 2, as shown in FIG. The charged potential of the photoreceptor 1 facing the photoreceptor 1 rises as shown in FIG.
従って、グリッド２に汚れが付着すると感光体帯電電位
の不均一さの原因となり、白スジ、黒スジ、かぶりなど
印刷品質上重要な問題を引き起こす。Therefore, if dirt adheres to the grid 2, it causes non-uniformity in the charged potential of the photoreceptor, causing important problems in print quality such as white streaks, black streaks, and fogging.
このため、従来よりグリッド２の清掃機構が考案されて
いるが、該グリッド２と清掃部材の同じ部分が接触して
清掃を行う従来のグリッド清掃機構では、清掃部材に付
着したトナーなどの汚れを取り除く機構がないため、清
掃を繰り返すにつれて清掃部材にトナーなどの汚れ物質
が堆積してしまうという欠点があった。For this reason, a cleaning mechanism for the grid 2 has been devised in the past. However, in the conventional grid cleaning mechanism in which the grid 2 and the same part of the cleaning member come into contact to perform cleaning, dirt such as toner attached to the cleaning member cannot be removed. Since there is no removal mechanism, there is a drawback that dirt substances such as toner accumulate on the cleaning member as cleaning is repeated.
更に、上記したような清掃部材でグリッド２の清掃を行
うと、グリッド２上のトナーなどの汚れ物質が除けない
ばかりでなく、清掃部材からグリッド２に汚れ物質が再
付着してしまい、感光体帯電電位の不均一さを生じ、印
刷品質上及び装置の信頼性上重要な問題を引き起こして
しまう。Furthermore, if the grid 2 is cleaned with the cleaning member described above, not only will the toner and other contaminants on the grid 2 not be removed, but the contaminants will re-adhere to the grid 2 from the cleaning member, causing damage to the photoreceptor. This results in non-uniform charging potential, which causes important problems in terms of print quality and device reliability.
本発明の目的は、スコロトロン帯電装置のグリッド清掃
機構において、上記した不具合を発生させぬ電子写真印
刷装置を提供することにある。SUMMARY OF THE INVENTION An object of the present invention is to provide an electrophotographic printing apparatus in which the above-described problems do not occur in a grid cleaning mechanism of a scorotron charging device.
本発明は、グリッドと清掃部材との接触位置を変えるこ
とにより、グリッドから取り除いたトナーなどの汚れが
清掃部材の１カ所に堆積するのを防止できることに着目
し、グリッド清掃部材をロール状の回転ブラシとし、清
掃時にはブラシを回転移動させ、グリッドには常にブラ
シの新たな部分が接触して汚れ堆積を防止するよう工夫
したものである。The present invention focuses on the fact that by changing the contact position between the grid and the cleaning member, dirt such as toner removed from the grid can be prevented from accumulating in one place on the cleaning member, and the grid cleaning member is rotated in the form of a roll. The brush is rotated during cleaning, and a new part of the brush always comes into contact with the grid to prevent dirt from accumulating.
以下実施例を図面を参照して説明する。 Examples will be described below with reference to the drawings.
第１図はグリッドの非清掃時の清掃部材の位置を示した
側面図、第２図はグリッドの清掃時の清掃部材の位置及
び様子を示した側面図である。FIG. 1 is a side view showing the position of the cleaning member when the grid is not being cleaned, and FIG. 2 is a side view showing the position and appearance of the cleaning member when the grid is being cleaned.
電子写真印刷装置のグリッド非清掃時においては、清掃
部材４は第１図に示す所定の位置で、グリッド２、コロ
ナワイヤ３の両方から離れた位置に待避している。When the electrophotographic printing apparatus is not cleaning the grid, the cleaning member 4 is retracted at a predetermined position shown in FIG. 1, away from both the grid 2 and the corona wire 3.
シールドケース５には、ラック５０１及び清掃部材４の
ガイド用溝５０２が設けである。なお、シールドケース
５の材質は従来金属板が多く用いられているが、プラス
チックモールドに金属板を配設し、ラック５０１やガイ
ド溝５０２の加工を容易にしても構わない。The shield case 5 is provided with a rack 501 and a guide groove 502 for the cleaning member 4. Although a metal plate is conventionally often used as the material for the shield case 5, a metal plate may be provided in a plastic mold to facilitate processing of the rack 501 and the guide groove 502.
グリッド清掃時、清掃部材４は第２図に示す如く駆動部
材６によって矢印方向Ａに駆動される。When cleaning the grid, the cleaning member 4 is driven in the direction of the arrow A by the driving member 6 as shown in FIG.
よって、清掃部材４はガイド溝５０２に案内されて矢印
Ｂで示す如くグリッド２の方向に移動しながら、グリッ
ド２及び感光体ドラム１と所定の擦過深さをもって接触
する。Therefore, the cleaning member 4 is guided by the guide groove 502 and moves in the direction of the grid 2 as shown by arrow B, while coming into contact with the grid 2 and the photosensitive drum 1 with a predetermined abrasion depth.
清掃部材４がさらに矢印Ａ方向に駆動されると、清掃部
材４の回転軸に設けられたギア４０１とシールドケース
５に設けられたラック５０１が噛み合う。前記ギア４０
１とラック５０１が噛み合うことによって、清掃部材４
に回転力Ｃが発生し、グリッド２に付：１１１、ｔ−１
，十−ｈ ｙ／７１壬りんゴ貴ぐノ部分４０２で取り除
くことができる。そして、グリッド２清掃終了後、清掃
部材４は第１図の如く所定の位置に戻り、グリッド２、
コロナワイヤ３の両方から離れた位置に待避する。When the cleaning member 4 is further driven in the direction of arrow A, a gear 401 provided on the rotating shaft of the cleaning member 4 and a rack 501 provided on the shield case 5 mesh with each other. The gear 40
1 and the rack 501 engage with each other, the cleaning member 4
Rotational force C is generated and attached to grid 2: 111, t-1
, 10-h y/71 It can be removed at the bottom part 402. After cleaning the grid 2, the cleaning member 4 returns to the predetermined position as shown in FIG.
Move away from both corona wires 3.
なお、ギア４０１のピッチ円を小さくすれば、グリッド
２と清掃部材４のブラシの周速比を大きくできるので、
グリッド２の清掃効果を高めることが可能となる。Note that by reducing the pitch circle of the gear 401, the peripheral speed ratio of the grid 2 and the brush of the cleaning member 4 can be increased.
It becomes possible to enhance the cleaning effect of the grid 2.
清掃部材４のブラシ４０２が感光体ドラム１と擦過する
ことにより、ブラシ４０２の毛先がグリッド２の側面や
感光体１に対向する面まで回り込むため、グリッド２の
全面が清掃できることはいうまでもない。As the brush 402 of the cleaning member 4 rubs against the photoreceptor drum 1, the bristles of the brush 402 wrap around the sides of the grid 2 and the surface facing the photoreceptor 1, so it goes without saying that the entire surface of the grid 2 can be cleaned. do not have.
また、ブラシ４０２に付着した汚れ物質は、感光体ドラ
ム１とブラシ４０２の擦過部分で、ブラシ４０２によっ
て叩き落とされて取り除かれるため、従来の清掃部材で
生じた清掃部材への汚れ物質堆積によるグリッドの清掃
不完全という問題は生じない。In addition, since the dirt attached to the brush 402 is knocked off and removed by the brush 402 at the friction portion between the photoreceptor drum 1 and the brush 402, the grid caused by the accumulation of dirt on the cleaning member, which occurs with conventional cleaning members, is removed. The problem of incomplete cleaning does not arise.
更に、グリッド清掃部材４でコロナワイヤ３も併せて清
掃するようにすることで、コロナワイヤ清掃機構を省略
することができ、装置の小型化、部品点数削減による高
信頼性、低コスト化を実現することができる。Furthermore, by cleaning the corona wire 3 with the grid cleaning member 4, the corona wire cleaning mechanism can be omitted, resulting in a smaller device, higher reliability, and lower cost due to a reduction in the number of parts. can do.
なお、上記したグリッド清掃は、電子写真印刷装置の電
源投入時、動作時間数、印刷ページ数、感光体表面電位
等の判断条件を組み合わせて行われるようにする。Note that the grid cleaning described above is performed in combination with judgment conditions such as the number of operating hours, the number of printed pages, and the surface potential of the photoreceptor when the electrophotographic printing apparatus is powered on.
第３図に示す如く、感光体がシート状で、ドラム軸方向
にスリット状の開口部を有するドラム７で、前記ドラム
７の内部にシート状感光体７０１の両端部を巻き取る構
造であって、前記ドラム７のスリット状開口部を塞ぐた
めのシール部材７０２を有する電子写真印刷装置におい
ては、グリッド２清掃時に、感光体ドラム７の停止位置
をドラム開口部シール部材７０２が清掃部材４と対向す
るように制御して、清掃部材４と感光体７０１とを接触
させないようにする。この結果、感光体７０１を傷つけ
ることなくグリッド２の清掃を行うことができる。As shown in FIG. 3, the photoreceptor is in the form of a sheet, and the drum 7 has a slit-like opening in the direction of the drum axis, and both ends of the sheet-like photoreceptor 701 are wound up inside the drum 7. In the electrophotographic printing apparatus having a sealing member 702 for closing the slit-shaped opening of the drum 7, the drum opening sealing member 702 opposes the cleaning member 4 at the stop position of the photosensitive drum 7 when cleaning the grid 2. The cleaning member 4 and the photoreceptor 701 are controlled so as not to come into contact with each other. As a result, the grid 2 can be cleaned without damaging the photoreceptor 701.
本発明によれば、スコロトロン帯電装置のグリッド清掃
部材をロール状の回転ブラシとし、清掃時にブラシを回
転させ、グリッドを常にブラシの新たな部分と接触させ
るようにしたので、清掃部材への汚れ堆積を防止するこ
とができる。また、感光体ドラムと回転ブラシを擦過さ
せることでブラシ毛先の回り込みが可能となり、グリッ
ドの全ｉのｎｓばかりでなくコロナワイヤを併せて清掃
することができるようになるので、感光体の帯電電位を
ｔに均一に保つことができ、印刷品質を常に安定に維持
することが可能となる。According to the present invention, the grid cleaning member of the scorotron charging device is a roll-shaped rotating brush, and the brush is rotated during cleaning so that the grid is always brought into contact with a new part of the brush, thereby preventing dirt from accumulating on the cleaning member. can be prevented. In addition, by rubbing the photoconductor drum with the rotating brush, the bristles of the brush can wrap around the brush, making it possible to clean not only the entire ins of the grid but also the corona wire. The potential can be kept uniform at t, and printing quality can always be maintained stably.
第１図は本発明の一実施例となるグリッドの非清掃時の
清掃部材の位置を示した側面図、第２図は本発明の一実
施例となるグリッドの清掃時の清掃部材の位置及び様子
を示した側面図、第３図は他の実施例を示す斜視図、第
４．５図は従来のグリッド清掃直後、直前のグリッドの
状態を示す側面図及び感光体帯電電位の様子を示したグ
ラフである。
図において、１は感光体、２はグリッド、３はコロナワ
イヤ、４は清掃部材、４０１は清掃部材の回転軸に設け
たギア、４０２はブラシ、５０１はシールドケースに設
けたランク、７０１はシート状感光体、７０２はドラム
開口部シール部材である。
特許比願人の名称 日立工機株式会社第１図
茅２図
第３図FIG. 1 is a side view showing the position of the cleaning member when cleaning the grid according to an embodiment of the present invention, and FIG. 2 is a side view showing the position of the cleaning member when cleaning the grid according to the embodiment of the present invention. FIG. 3 is a perspective view showing another embodiment, and FIG. 4.5 is a side view showing the state of the grid immediately before and after conventional grid cleaning, and the state of the photoreceptor charging potential. This is a graph. In the figure, 1 is a photoreceptor, 2 is a grid, 3 is a corona wire, 4 is a cleaning member, 401 is a gear provided on the rotating shaft of the cleaning member, 402 is a brush, 501 is a rank provided in the shield case, and 701 is a sheet A shaped photoreceptor 702 is a drum opening sealing member. Name of patent applicant Hitachi Koki Co., Ltd. Figure 1 Figure 2 Figure 3
Claims (1)
ワイヤと感光体の間に、感光体に近接して平行に配設さ
れた複数の金属ワイヤまたは開口部を設けた金属板など
で構成されたグリッドと、前記グリッドを清掃するため
の清掃機構とを有する電子写真印刷装置のコロナ放電装
置において、前記清掃機構に用いられる清掃部材をロー
ル状のブラシとし、該ブラシが回転しながらグリッドの
清掃を行うことを特徴とする電子写真印刷装置。 ２ 前記清掃部材は、被清掃部長手方向に回転移動しな
がら清掃を行うことを特徴とする請求項１記載の電子写
真印刷装置。 ３ 前記清掃部材は、前記ブラシの軸に設けたギアと、
コロナ放電装置のシールドケースの清掃部材移動方向に
設けられたラックが噛み合うことにより回転移動する請
求項２記載の電子写真印刷装置。 ４ 前記清掃部材はコロナワイヤも併せて清掃を行うこ
とを特徴とする請求項１記載の電子写真印刷装置。 ５ グリッドの非清掃時においては、前記清掃部材がグ
リッドとコロナワイヤの両方から離れることを特徴とす
る請求項１または２記載の電子写真印刷装置。 ６ 感光体がシート状であり、ドラム軸方向にスリット
状の開口部を有するドラムで、該ドラムのスリット状開
口部を塞ぐためのシール部材を有する電子写真印刷装置
のグリッド清掃は、前記シール部材が清掃部材と対向す
るように前記感光体ドラムを停止させることを特徴とす
る請求項１記載の電子写真印刷装置。[Scope of Claims] 1. A corona wire that generates corona discharge, and a plurality of metal wires or a metal plate provided with an opening between the corona wire and the photoreceptor and arranged in parallel close to the photoreceptor. In a corona discharge device for an electrophotographic printing apparatus, the cleaning member used in the cleaning mechanism is a roll-shaped brush, and the brush rotates. An electrophotographic printing device characterized in that a grid is cleaned while the grid is being cleaned. 2. The electrophotographic printing apparatus according to claim 1, wherein the cleaning member performs cleaning while rotating and moving in the longitudinal direction of the part to be cleaned. 3. The cleaning member includes a gear provided on the shaft of the brush;
3. The electrophotographic printing apparatus according to claim 2, wherein racks provided in the direction of movement of the cleaning member of the shield case of the corona discharge device are rotated by being engaged with each other. 4. The electrophotographic printing apparatus according to claim 1, wherein the cleaning member also cleans the corona wire. 5. The electrophotographic printing apparatus according to claim 1 or 2, wherein the cleaning member is separated from both the grid and the corona wire when the grid is not being cleaned. 6 Grid cleaning of an electrophotographic printing apparatus in which the photoreceptor is a sheet-shaped drum having a slit-shaped opening in the direction of the drum axis and a sealing member for closing the slit-shaped opening of the drum is performed using the sealing member. 2. The electrophotographic printing apparatus according to claim 1, wherein the photosensitive drum is stopped so that it faces a cleaning member.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP33768690A JPH04204874A (en) | 1990-11-30 | 1990-11-30 | Electrophotographic printer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP33768690A JPH04204874A (en) | 1990-11-30 | 1990-11-30 | Electrophotographic printer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH04204874A true JPH04204874A (en) | 1992-07-27 |
Family
ID=18311013
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP33768690A Pending JPH04204874A (en) | 1990-11-30 | 1990-11-30 | Electrophotographic printer |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH04204874A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7272337B2 (en) * | 2005-09-15 | 2007-09-18 | Xerox Corporation | Corona device grid cleaner |
| US8437656B2 (en) | 2009-05-19 | 2013-05-07 | Brother Kogyo Kabushiki Kaisha | Charger |
-
1990
- 1990-11-30 JP JP33768690A patent/JPH04204874A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7272337B2 (en) * | 2005-09-15 | 2007-09-18 | Xerox Corporation | Corona device grid cleaner |
| US8437656B2 (en) | 2009-05-19 | 2013-05-07 | Brother Kogyo Kabushiki Kaisha | Charger |
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