JPH059728Y2 - - Google Patents
Info
- Publication number
- JPH059728Y2 JPH059728Y2 JP10505986U JP10505986U JPH059728Y2 JP H059728 Y2 JPH059728 Y2 JP H059728Y2 JP 10505986 U JP10505986 U JP 10505986U JP 10505986 U JP10505986 U JP 10505986U JP H059728 Y2 JPH059728 Y2 JP H059728Y2
- Authority
- JP
- Japan
- Prior art keywords
- developer
- electrode plate
- period
- during
- voltage
- 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
- 230000015572 biosynthetic process Effects 0.000 claims description 7
- 239000011521 glass Substances 0.000 description 10
- 230000003287 optical effect Effects 0.000 description 9
- 239000000428 dust Substances 0.000 description 4
- 238000005192 partition Methods 0.000 description 3
- 238000011105 stabilization Methods 0.000 description 3
- VOZKAJLKRJDJLL-UHFFFAOYSA-N 2,4-diaminotoluene Chemical compound CC1=CC=C(N)C=C1N VOZKAJLKRJDJLL-UHFFFAOYSA-N 0.000 description 2
- 238000004140 cleaning Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000006641 stabilisation Effects 0.000 description 2
- 238000011109 contamination Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000005286 illumination Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 238000010186 staining Methods 0.000 description 1
Landscapes
- Dry Development In Electrophotography (AREA)
Description
【考案の詳細な説明】
産業上の利用分野
本考案は、電子写真複写装置のような電子写真
式画像形成装置に関し、特に画像形成装置内に現
像剤が飛散するのを防止する現像剤の飛散防止手
段を備えた電子写真式画像形成装置に関するもの
である。[Detailed Description of the Invention] Industrial Application Field The present invention relates to an electrophotographic image forming apparatus such as an electrophotographic copying apparatus, and in particular to a method for preventing developer from scattering within the image forming apparatus. The present invention relates to an electrophotographic image forming apparatus equipped with a prevention means.
従来の技術
従来、画像形成装置、例えば電子写真複写装置
は第３図に示すように構成される。複写装置の概
略中央部に図示矢印方向に回転する感光ドラム１
が配置され、この感光ドラム１の周囲に帯電器
２、現像器３、転写放電器４、クリーニング装置
５が配設される。又帯電器２と現像器３との間に
露光部があり、複写装置の上部に配置された照明
系６及び光学系７を通じて原稿画像が感光ドラム
１上に投影される。2. Description of the Related Art Conventionally, an image forming apparatus, such as an electrophotographic copying apparatus, is configured as shown in FIG. A photosensitive drum 1 that rotates in the direction of the arrow shown is located approximately in the center of the copying device.
A charger 2 , a developer 3 , a transfer discharger 4 , and a cleaning device 5 are arranged around the photosensitive drum 1 . Further, there is an exposure section between the charger 2 and the developer 3, and an original image is projected onto the photosensitive drum 1 through an illumination system 6 and an optical system 7 arranged at the top of the copying apparatus.
光学系７はミラー８，９，１０，１１及びレン
ズ１２から構成され、又光学系７を区画するべく
感光ドラム１の上部に仕切壁１３が設けられる。
該仕切壁１３の一部には開口部１３ａが形成さ
れ、光学系７から感光ドラム１に至る光路を画定
する。通常、該開口部１３ａには防塵ガラス１４
が取り付けられており、現像剤が特に現像装置及
びその近傍から光学系７へと飛散するのを防止し
ている。 The optical system 7 is composed of mirrors 8, 9, 10, 11 and a lens 12, and a partition wall 13 is provided above the photosensitive drum 1 to partition the optical system 7.
An opening 13 a is formed in a part of the partition wall 13 to define an optical path from the optical system 7 to the photosensitive drum 1 . Usually, the opening 13a has a dustproof glass 14.
is attached to prevent the developer from scattering particularly from the developing device and its vicinity to the optical system 7.
感光ドラム１に形成された静電潜像は現像器３
で現像され、給紙部１５からガイドローラ１６及
びガイド板１７を介して送られてくる転写紙に転
写放電器４により転写される。転写紙は搬送部１
８により定着器１９に送られて定着され、かくし
てコピーが得られる。 The electrostatic latent image formed on the photosensitive drum 1 is transferred to a developing device 3.
The image is developed and transferred by the transfer discharger 4 onto a transfer paper fed from the paper feed section 15 via the guide roller 16 and the guide plate 17. Transfer paper is transported in conveyance section 1
8 to the fixing device 19 where it is fixed, thus obtaining a copy.
第４図は、第３図の複写装置の感光ドラム１、
現像装置３及びその周辺部を拡大して示す。従来
の複写装置において感光ドラム１上に形成された
潜像は、現像装置に設けられた現像ロール３ａに
よつて現像装置３の内部から感光ドラム１へと搬
送された現像剤によつて顕像化される。この時、
現像ロール３ａの表面から現像剤が飛散し、飛散
した現像剤Ａは装置内の各部に飛散していくこと
が知られている。従つて、上記防塵ガラス１４の
下面にも図示するように現像剤Ｂが付着する。 FIG. 4 shows the photosensitive drum 1 of the copying machine shown in FIG.
The developing device 3 and its surrounding area are shown enlarged. In a conventional copying device, a latent image formed on the photosensitive drum 1 is developed by a developer conveyed from the inside of the developing device 3 to the photosensitive drum 1 by a developing roll 3a provided in the developing device. be converted into At this time,
It is known that the developer scatters from the surface of the developing roll 3a, and the scattered developer A scatters to various parts within the apparatus. Therefore, the developer B also adheres to the lower surface of the dustproof glass 14 as shown in the figure.
この防塵ガラス１４の下面に付着した現像剤Ｂ
は光学系の光路の一部を遮断することになるた
め、転写紙の進行方向に筋状の画像汚れを引き起
こすこととなつた。このため、第５図に示すよう
に、現像装置３に感光ドラム１と近接させて防塵
カバー３ｂを設け防塵ガラス１４に飛散現像剤が
付着するのを防止した複写装置が提案されてい
る。 Developer B attached to the bottom surface of this dustproof glass 14
This caused a portion of the optical path of the optical system to be blocked, resulting in streak-like staining of the image in the direction of travel of the transfer paper. Therefore, as shown in FIG. 5, a copying apparatus has been proposed in which a dustproof cover 3b is provided on the developing device 3 in close proximity to the photosensitive drum 1 to prevent the scattered developer from adhering to the dustproof glass 14.
考案が解決しようとする問題点
このように、現像装置３に感光ドラム１と近接
させて防塵カバー３ｂを設けることにより、防塵
ガラス１４の周辺に飛散する現像剤を阻止し、防
塵ガラス１４が飛散現像剤にて汚損されることは
防止される。しかしながら、第５図に図示される
ように、防塵カバー３ｂの下面に現像剤が付着し
蓄積され、この蓄積量がある程度多くなると、防
塵カバー３ｂの下面から離れて落下し（ぼた落
ち）、この落下した現像剤Ｄが感光ドラム１上や
現像ローラ３ａ上に付着し、斑点上の画像汚れを
生じさせる欠点があつた。換言すれば、現像部か
ら光学系への現像剤の飛散を防止するための防塵
カバーが画像汚れの原因となつてしまうという新
たな問題を生じた。Problems to be Solved by the Invention As described above, by providing the dustproof cover 3b on the developing device 3 in close proximity to the photosensitive drum 1, the developer is prevented from scattering around the dustproof glass 14, and the dustproof glass 14 is prevented from scattering. Contamination with developer is prevented. However, as shown in FIG. 5, the developer adheres to and accumulates on the lower surface of the dustproof cover 3b, and when this accumulated amount increases to a certain extent, it separates from the lower surface of the dustproof cover 3b and falls (drip). This fallen developer D adheres to the photosensitive drum 1 and the developing roller 3a, causing image stains on spots. In other words, a new problem has arisen in that the dustproof cover for preventing the developer from scattering from the developing section to the optical system becomes a cause of image stains.
考案の目的
従つて、本考案の目的は、集塵手段として防塵
カバーの下面に、又は防塵カバーの代りに集塵手
段として独立に電極板を設けるという簡単な構成
によつて上記した従来装置の欠点を除去し、画像
汚れのない良質の画像を得ることのできる電子写
真式画像形成装置を提供することである。Purpose of the invention Therefore, the purpose of the present invention is to improve the above-mentioned conventional device by using a simple structure in which an electrode plate is provided as a dust collection means on the underside of a dustproof cover or independently as a dust collection means in place of the dustproof cover. It is an object of the present invention to provide an electrophotographic image forming apparatus capable of eliminating defects and obtaining high-quality images without image stains.
問題点を解決するための手段
上記目的は本考案による電子写真式画像形成装
置によつて完全に達成される。本考案を要約する
と、現像装置に隣接して、飛散した現像剤を捕集
するための電極板を設け、該電極板に少なくとも
現像期間（好ましくは潜像形成期間、現像期間及
び転写期間中）は飛散した現像剤と異極性の電圧
を印加し、前記以外の所定期間には飛散した現像
剤と同極性の電圧を印加することを特徴とする電
子写真式画像形成装置である。Means for Solving the Problems The above objects are completely achieved by the electrophotographic image forming apparatus according to the present invention. To summarize the present invention, an electrode plate for collecting scattered developer is provided adjacent to the developing device, and the electrode plate is provided at least during the development period (preferably during the latent image formation period, the development period, and the transfer period). is an electrophotographic image forming apparatus characterized in that a voltage of a polarity different from that of the scattered developer is applied, and a voltage of the same polarity as that of the scattered developer is applied during a predetermined period other than the above.
実施例
以下、本考案の一実施例について添付図面を参
照して詳細に説明する。Embodiment Hereinafter, an embodiment of the present invention will be described in detail with reference to the accompanying drawings.
第１図は本考案の一実施例を示す要部断面図で
あり、感光ドラム１、現像装置３及び防塵ガラス
１４の配置関係を示す。本実施例において、現像
装置３には上記従来の複写装置と同様に感光ドラ
ム１と近接して防塵カバー３ｂが取付けられる。 FIG. 1 is a sectional view of a main part of an embodiment of the present invention, showing the arrangement of a photosensitive drum 1, a developing device 3, and a dust-proof glass 14. As shown in FIG. In this embodiment, a dustproof cover 3b is attached to the developing device 3 in close proximity to the photosensitive drum 1, as in the conventional copying device described above.
本考案によると、防塵カバー３ｂの下面には電
極板３ｃが取付けられ、この電極板３ｃには、一
連の複写サイクルのうち少なくとも現像期間、好
ましくは潜像形成期間、現像期間及び転写期間中
は飛散する現像剤が帯電している極性とは反対極
性の電圧を印加し、そして複写サイクルのうちの
上述した以外の期間中は現像部で飛散する現像剤
が帯電している極性と同じ極性の電圧が印加され
る。より具体的に一例を挙げて説明すれば、使用
されている現像剤がプラスの電荷を有していると
すると、該電極板３ｃには潜像形成期間、現像期
間及び転写期間中はマイナスの電圧が印加され、
上記以外の所定期間には、例えば、画像形成前の
立上り時（前回転、ドラム特性安定化等の初期安
定化時）、画像形成後のクリーニング期間、後安
定化時のいずれかのときにプラスの電圧が印加さ
れる。 According to the present invention, an electrode plate 3c is attached to the lower surface of the dust-proof cover 3b, and the electrode plate 3c is provided with the electrode plate 3c during at least the development period, preferably the latent image formation period, the development period, and the transfer period of a series of copying cycles. A voltage of the opposite polarity to the polarity with which the scattered developer is charged is applied, and during periods other than those mentioned above in the copying cycle, a voltage of the same polarity as the polarity with which the scattered developer is charged is applied. A voltage is applied. To give a more specific example, assuming that the developer used has a positive charge, the electrode plate 3c has a negative charge during the latent image formation period, development period, and transfer period. voltage is applied,
Predetermined periods other than those listed above include, for example, during startup before image formation (pre-rotation, initial stabilization such as drum characteristic stabilization), during the cleaning period after image formation, or during post-stabilization. voltage is applied.
このように構成すると、現像部で飛散した現像
剤は、潜像形成期間、現像期間及び転写期間は第
１図に示すように電極板３ｃへ吸引され電極板上
に捕集される。一方、上述の期間以外の期間は第
２図に示されるように電極板３ｃに捕集され蓄積
された現像剤は反揆力により電極板３ｃから離
れ、感光ドラム１上又は現像ローラ３ａ上に落下
する。この期間、すなわち潜像形成、現像及び転
写の各期間を除く期間は現像剤が感光ドラム上や
現像スリーブ上に落下してもこれが転写紙に転写
されることがないため従来のように斑点状の画像
汚れが生じることはない。 With this configuration, the developer scattered in the developing section is attracted to the electrode plate 3c and collected on the electrode plate during the latent image forming period, the developing period, and the transfer period, as shown in FIG. On the other hand, during periods other than the above-mentioned period, as shown in FIG. 2, the developer collected and accumulated on the electrode plate 3c is separated from the electrode plate 3c due to repulsive force and is deposited on the photosensitive drum 1 or the developing roller 3a. Fall. During this period, excluding the latent image formation, development and transfer periods, even if the developer falls onto the photosensitive drum or developing sleeve, it will not be transferred to the transfer paper, so it will not appear in spots like in the past. No image stains will occur.
上記実施例では飛散した現像剤を捕集するため
の電極板を現像装置に取り付けたが、複写装置本
体に設けることも可能であるし、また防塵カバー
３ｂ自体を集塵用の捕集電極板としてもよい。 In the above embodiment, an electrode plate for collecting scattered developer was attached to the developing device, but it is also possible to provide it to the main body of the copying machine, or the dust cover 3b itself can be used as a collecting electrode plate for collecting dust. You can also use it as
更に、本装置は電子写真複写装置に限定される
ものではなく、例えば電子写真プリンター、コン
ピユータ出力部等のの他の画像形成装置にも本考
案が適用できることは勿論である。 Further, the present apparatus is not limited to an electrophotographic copying apparatus, and it goes without saying that the present invention can be applied to other image forming apparatuses such as an electrophotographic printer, a computer output section, and the like.
考案の効果
上述のように、本考案によれば、飛散した現像
剤を捕集するための電極板を設け、画像形成サイ
クルのうち、少なくとも現像期間（好ましくは潜
像形成、現像及び転写の各期間の間）は飛散した
現像剤と反対極性の電圧を印加して飛散した現像
剤を電極板上に集め、又それ以外の所定期間は現
像剤と同極性の電圧を印加して電極板に捕集した
現像剤を分離して落下させるものであるから、そ
の構成は簡単であり、製造上の問題や経済上の問
題を生じることなく確実に防塵ガラスの汚れを防
止することができ、かつ防塵カバーからの蓄積し
た現像剤のぼた落ちを阻止することができる。従
つて、防塵ガラスの汚れによる筋状の画像汚れ、
及び蓄積した現像剤のぼた落ちによる斑点状の画
像汚れは完全に防止され、鮮明な複写画像が得ら
れる著しい効果がある。Effects of the Invention As described above, according to the present invention, an electrode plate is provided to collect the scattered developer, and an electrode plate is provided to collect the scattered developer, and an electrode plate is provided to collect the scattered developer. During this period), a voltage with the opposite polarity to that of the scattered developer is applied to collect the scattered developer on the electrode plate, and during other predetermined periods, a voltage with the same polarity as that of the developer is applied to collect the scattered developer on the electrode plate. Since the collected developer is separated and dropped, its structure is simple, and it can reliably prevent dirt on the dustproof glass without causing manufacturing or economic problems. It is possible to prevent accumulated developer from dripping from the dustproof cover. Therefore, streak-like image stains due to dirt on the dustproof glass,
Also, spot-like image stains caused by accumulated developer drippings are completely prevented, and there is a remarkable effect that clear copied images can be obtained.
第１図及び第２図は、本考案に係る画像形成装
置の一実施例を示す要部断面図である。第３図
は、従来の電子写真複写装置の一例を示す断面図
である。第４図及び第５図は、従来の電子写真複
写装置の動作を説明するための要部断面図であ
る。
１……感光ドラム、３……現像装置、３ａ……
防塵カバー、３ｃ……電極板、１４……防塵ガラ
ス。
1 and 2 are sectional views of essential parts showing an embodiment of an image forming apparatus according to the present invention. FIG. 3 is a sectional view showing an example of a conventional electrophotographic copying apparatus. FIGS. 4 and 5 are sectional views of essential parts for explaining the operation of a conventional electrophotographic copying apparatus. 1...Photosensitive drum, 3...Developing device, 3a...
Dust-proof cover, 3c...electrode plate, 14...dust-proof glass.
Claims (1)
するための電極板を設け、該電極板に少なくと
も現像期間中は飛散した現像剤と異極性の電圧
を印加し、前記以外の所定期間には飛散した現
像剤と同極性の電圧を印加することを特徴とす
る電子写真式画像形成装置。 ２ 電極板に現像剤と異極性の電圧を印加する期
間は、潜像形成期間、現像期間及び転写期間で
ある実用新案登録請求の範囲第１項記載の装
置。 ３ 電極板は現像装置に一体に取付けられて成る
実用新案登録請求の範囲第１項又は第２項記載
の装置。 ４ 電極板は装置本体に取付けられて成る実用新
案登録請求の範囲第１項又は第２項記載の装
置。[Claims for Utility Model Registration] 1. An electrode plate is provided adjacent to the developing device to collect the scattered developer, and a voltage of a polarity different from that of the scattered developer is applied to the electrode plate at least during the development period. An electrophotographic image forming apparatus characterized in that a voltage having the same polarity as that of the scattered developer is applied during a predetermined period other than the above. 2. The device according to claim 1, wherein the periods during which a voltage of a polarity different from that of the developer is applied to the electrode plate are a latent image formation period, a development period, and a transfer period. 3. The device according to claim 1 or 2, wherein the electrode plate is integrally attached to the developing device. 4. The device according to claim 1 or 2, wherein the electrode plate is attached to the main body of the device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10505986U JPH059728Y2 (en) | 1986-07-09 | 1986-07-09 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10505986U JPH059728Y2 (en) | 1986-07-09 | 1986-07-09 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6311650U JPS6311650U (en) | 1988-01-26 |
| JPH059728Y2 true JPH059728Y2 (en) | 1993-03-10 |
Family
ID=30979130
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP10505986U Expired - Lifetime JPH059728Y2 (en) | 1986-07-09 | 1986-07-09 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH059728Y2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4765341B2 (en) * | 2005-03-08 | 2011-09-07 | 富士ゼロックス株式会社 | Developing device and image forming apparatus using the same |
-
1986
- 1986-07-09 JP JP10505986U patent/JPH059728Y2/ja not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6311650U (en) | 1988-01-26 |
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