JPS6380287A - Developing and cleaning device for image forming device - Google Patents
Developing and cleaning device for image forming deviceInfo
- Publication number
- JPS6380287A JPS6380287A JP22484886A JP22484886A JPS6380287A JP S6380287 A JPS6380287 A JP S6380287A JP 22484886 A JP22484886 A JP 22484886A JP 22484886 A JP22484886 A JP 22484886A JP S6380287 A JPS6380287 A JP S6380287A
- Authority
- JP
- Japan
- Prior art keywords
- photoreceptor
- developing
- latent image
- transfer
- powder
- 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 title claims abstract description 51
- 238000012546 transfer Methods 0.000 claims abstract description 100
- 239000000843 powder Substances 0.000 claims abstract description 75
- 238000000034 method Methods 0.000 claims abstract description 59
- 238000011161 development Methods 0.000 claims description 28
- 238000005513 bias potential Methods 0.000 claims 1
- 238000011109 contamination Methods 0.000 abstract 2
- 108091008695 photoreceptors Proteins 0.000 description 98
- JOYRKODLDBILNP-UHFFFAOYSA-N Ethyl urethane Chemical compound CCOC(N)=O JOYRKODLDBILNP-UHFFFAOYSA-N 0.000 description 14
- 238000010586 diagram Methods 0.000 description 11
- 230000003068 static effect Effects 0.000 description 10
- 238000003379 elimination reaction Methods 0.000 description 8
- 230000008030 elimination Effects 0.000 description 7
- 238000001454 recorded image Methods 0.000 description 6
- 230000015572 biosynthetic process Effects 0.000 description 5
- 230000006866 deterioration Effects 0.000 description 3
- 230000002238 attenuated effect Effects 0.000 description 2
- 230000005611 electricity Effects 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000003860 storage Methods 0.000 description 2
- 230000002411 adverse Effects 0.000 description 1
- 238000004040 coloring Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000012212 insulator Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
- 150000003673 urethanes Chemical class 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Landscapes
- Cleaning In Electrography (AREA)
Abstract
Description
【発明の詳細な説明】
(発明の目的〕
(産業上の利用分野)
本発明はレーザプリンタや複写機等において、同一の現
像ローうにより、感光体に形成される静電潜像の現像工
程及び感光体上の転写残り粉体の清掃工程とを同時に行
う画像形成装置における現像清掃装置の改良に関する。Detailed Description of the Invention (Objective of the Invention) (Industrial Field of Application) The present invention relates to a process for developing an electrostatic latent image formed on a photoreceptor by the same developing row in a laser printer, a copying machine, etc. The present invention also relates to an improvement in a developing cleaning device in an image forming apparatus that simultaneously performs a cleaning process for powder remaining after transfer on a photoreceptor.
(従来の技術)
一般に、電子写真記録プロセスを使用した複写機ヤレー
ザプリンタ等においては、感光体をくり返し使用するた
めに、感光体のくり返し使用プロセスには、感光体上に
現像された粉体像が転写部材に転写される転写工程と、
感光体上に帯電露光して静電潜像を形成する静電描懺形
成工程の間に感光体上の転写残り粉体を清1吊するため
の感光体清掃工程が設けられている。(Prior Art) Generally, in copiers, laser printers, etc. that use an electrophotographic recording process, the photoreceptor is used repeatedly. a transfer step in which the image is transferred to a transfer member;
A photoconductor cleaning step is provided to remove powder remaining after transfer on the photoconductor during an electrostatic marking forming step in which an electrostatic latent image is formed on the photoconductor by charging and exposing the photoconductor.
例えば第8図は第1の従来例によるレーザプリンタの慨
略説明図であるが、このレーザプリンタでは感光体2が
帯電チャージャー6により一様にマイナス帯電される一
方、ポリゴンミラー4により走査されたレーザ光1′B
がFθレンズ3によって、感光体2上に集光、露光され
且つ半導体レーザ光の場合のように電源の0N−OFF
により感光体2の電荷を露光減衰させ、静電潜像が形成
される。For example, FIG. 8 is a schematic explanatory diagram of a first conventional laser printer. In this laser printer, the photoreceptor 2 is uniformly negatively charged by the charging charger 6, while being scanned by the polygon mirror 4. Laser beam 1'B
is focused and exposed onto the photoreceptor 2 by the Fθ lens 3, and the power supply is turned on and off as in the case of semiconductor laser light.
The charge on the photoreceptor 2 is attenuated by exposure, and an electrostatic latent image is formed.
この感光体2上の静電潜像は、現像器5の現像スリーブ
19に所定の現像バイアスを印加しておくことにより、
この現像器5によって現像されるこの現像された粉体像
が転写チャージャ11によって、転写部材Pに転写され
、定着器13によって転写部材Pに定着される。This electrostatic latent image on the photoreceptor 2 can be formed by applying a predetermined developing bias to the developing sleeve 19 of the developing device 5.
The developed powder image developed by the developing device 5 is transferred onto the transfer member P by the transfer charger 11 and fixed onto the transfer member P by the fixing device 13.
一方、転写チャージャ11により転写部材Pに転写され
ずに感光体2上に残った転写残り粉体は清掃装置16の
クリーニングブレード17により感光体2より除去され
る。On the other hand, the transfer residual powder remaining on the photoreceptor 2 without being transferred to the transfer member P by the transfer charger 11 is removed from the photoreceptor 2 by the cleaning blade 17 of the cleaning device 16 .
こうして清掃された感光体2は、除電ランプ7で帯電電
荷を除去されて再び帯電チャージャ6で帯電され、上述
した作像プロセスを継続することができる。The thus cleaned photoreceptor 2 is de-charged by the static elimination lamp 7 and charged again by the charger 6, so that the above-described image forming process can be continued.
第9図、第10図及び第11図は、感光体の繰返し使用
プロセス上からみたときの従来例の各プロセスを示した
ものである。FIG. 9, FIG. 10, and FIG. 11 show each conventional process when viewed from the top of the process of repeatedly using a photoreceptor.
第9図において、■→■→■→(へ)→■→0→ωの流
れは、感光体の静電潜像の帯電部にこの帯電電荷と逆極
性の粉体を吸着させ現像するタイプ、つまり正規現像プ
ロセスの感光体繰返し使用のプロセスを示している。In Figure 9, the flow of ■ → ■ → ■ → (to) → ■ → 0 → ω is a type that develops by adsorbing powder with the opposite polarity to the charged part of the electrostatic latent image on the photoreceptor. , that is, it shows the process of repeated use of the photoreceptor in the regular development process.
第10図において、■→■→(3)→に)→■→0→■
の流れは、感光体の静電潜像の露光部に高電位部と同極
性の粉体を吸着させ現像するタイプ、つまり2成分反転
プロセスの感光体繰返し使用のプロセスを示している。In Figure 10, ■→■→(3)→)→■→0→■
This flow indicates a type in which powder having the same polarity as the high potential area is adsorbed to the exposed part of the electrostatic latent image on the photoreceptor for development, that is, a two-component reversal process in which the photoreceptor is used repeatedly.
第11図において、ω→■→■→に)→■→0→0)の
流れは、感光体の静電潜像放電部に現像ローラから1成
分粉体に電荷を誘起または注入し、これによって帯電し
た1成分粉体を吸着させ現像するタイプ、つまり1成分
反転現像プロセスの感光体使用プロセスを示している。In Fig. 11, the flow of ω→■→■→)→■→0→0) induces or injects charges from the developing roller into the one-component powder in the electrostatic latent image discharge area of the photoreceptor, and this This shows a type in which a charged one-component powder is adsorbed and developed, that is, a one-component reversal development process using a photoreceptor.
このような3例より明らかなように、感光体を繰返し使
用するためには、転写工程の後に感光体上の転写残り粉
体を感光体から除去することが必要且つ不可欠とされて
いた。As is clear from these three examples, in order to use the photoreceptor repeatedly, it is necessary and essential to remove the transfer residual powder on the photoreceptor from the photoreceptor after the transfer process.
実際第9図の正規現像プロセスにおいて、清掃工程■を
省略し、直接除電工程に行った場合、っまりα)′→■
′→■→0)→(6)′→■′→の感光体くり返し使用
プロセスでは、転写残り粉体が帯電工程歌で帯電され、
その後露光されると、露光部に残った帯電粉体は現像工
程(3)に行っても、感光体の露光後の残光電位と現像
バイヤスがほぼ同じであるため、現像時に清掃されるこ
とがなくそのまま残留し次の転写工程(イ)で転写部材
に転写され、ゴースト像、地力ブリ、地汚れ等の現像悪
化要因になる。In fact, in the regular development process shown in Fig. 9, if the cleaning step ■ is omitted and the static electricity removal step is directly performed, the result is α)′→■
In the process of repeatedly using the photoconductor from ′→■→0)→(6)′→■′→, the powder remaining after transfer is charged in the charging process.
After that, when exposed to light, the charged powder remaining in the exposed area will be cleaned during development even if it goes to the development step (3) because the afterglow potential of the photoreceptor after exposure and the development bias are almost the same. It remains as it is and is transferred to the transfer member in the next transfer step (a), causing development deterioration such as ghost images, ground blur, and background smudges.
また第10図、第11図に示す2成分及び1成分現像剤
を使った反転現像プロセスでも清掃工程■を省略し、転
写工程から直接除電工程に行った場合、つまり(ト)′
→■′→■→Ω)→0′→■′の感光体くり返し使用プ
ロセスでは露光■′を通ったところで、静電潜像の帯電
部に残った転写残り帯電粉体は、現像工程■で現像バイ
アスVBが感光体帯電部の表面電位Voとほぼ等しく設
定されるため、清掃されずに残ってしまい第9図の場合
と同様法の転写工程0)で転写部材に転写される。これ
も画像悪化要因となることは明白である。Furthermore, even in the reversal development process using two-component and one-component developers shown in FIGS.
→■'→■→Ω)→0'→■' In the process of repeatedly using the photoreceptor, the transferred charged powder remaining on the charged part of the electrostatic latent image after passing through exposure ■' is removed in the developing step ■. Since the developing bias VB is set to be approximately equal to the surface potential Vo of the charged portion of the photoreceptor, the toner remains without being cleaned and is transferred to the transfer member in the transfer step 0) in the same manner as in the case of FIG. It is clear that this is also a factor in image deterioration.
従って第9図、第10図、及び第11図のような感光体
くり返し使用プロセスでは転写工程(へ)と帯電工程α
)の間に感光体の清掃工程を設けることは必要不可欠に
なってくる。Therefore, in the process of repeatedly using the photoconductor as shown in FIGS. 9, 10, and 11, the transfer process (to) and the charging process α
) It becomes essential to provide a cleaning process for the photoreceptor between the two steps.
しかしながら、このような清掃装置を設けることは、清
掃装置を設置しなければならず、それだ【プ空間容積を
大きく取らねばならず、従って記録装置を大きくしてし
まうという問題を生じさせる。However, providing such a cleaning device causes the problem that the cleaning device must be installed, which requires a large volume of space, and therefore the recording device becomes large.
このような欠点を克服するため、第2の従来例として清
掃装置を省略し、−作像プロセス中、感光体を2回転さ
せ、2回転毎に現像バイアスを変化させ、1回転毎に現
像工程を担った現像器を今度は清掃手段として働かせる
ものがつくられている。第12図は、この感光体くり返
し使用プロセスを示したものである。In order to overcome such drawbacks, a second conventional example omitted the cleaning device, - During the image forming process, the photoreceptor is rotated twice, the developing bias is changed every two rotations, and the developing process is completed every rotation. A device has been created that uses the developing device that was responsible for this as a cleaning means. FIG. 12 shows this process of repeatedly using the photoreceptor.
第12図で(ト)→■→■→に)→0の段階で感光体は
約−回転し、次の約1回転で(へ)→0→■の清掃工程
を行うようになっている。In Figure 12, the photoreceptor rotates approximately - at the stage of (g)→■→■→)→0, and in the next approximately one rotation, the cleaning process of (g)→0→■ is performed. .
第12図は、帯電工程(ト)で感光体は一様にマイナス
帯電され、表面電位Voとなる。露光工程■で露光され
、静電潜像が形成される。現像工程■では感光体の露光
放電部の残菌電位とほぼ同電位もしくはやや大きい電位
にバイアスされた現像ローラにより静電潜像の帯電部に
帯電電荷と逆極性の粉体を吸着させて、現像する。転写
工程6)では、上記現像された粉体像を転写チャージャ
により転写部材に転写する。この後除電工程0で感光体
は除電光と除電チャージャにより電気的に除電される。In FIG. 12, the photoreceptor is uniformly negatively charged in the charging step (g) and has a surface potential Vo. It is exposed in the exposure step (2) to form an electrostatic latent image. In the developing step (2), a developing roller biased to a potential that is approximately the same as or slightly higher than the residual germ potential of the exposed discharge area of the photoreceptor adsorbs powder of opposite polarity to the charged area of the electrostatic latent image. develop. In the transfer step 6), the developed powder image is transferred to a transfer member by a transfer charger. Thereafter, in a static elimination process 0, the photoreceptor is electrically neutralized by a static elimination light and a static elimination charger.
ここで、感光体はほぼ1回転する。この後現像ローラの
バイアスVBはO<Va<Voの間に設定される。ここ
で現像ローラは、清掃手段に変身し感光体上の転写残り
粉体を感光体より除去する。Here, the photoreceptor rotates approximately once. After that, the bias VB of the developing roller is set between O<Va<Vo. Here, the developing roller transforms into a cleaning means and removes the transfer residual powder on the photoreceptor from the photoreceptor.
こうして感光体2回転1記録画像を形成するようになっ
ている。しかしこのような感光体のくり返し使用プロセ
スでは、感光体の周長は少なくとも、1記録画像の長さ
以上になっていなりればならない。換言すれば感光体の
周長が1記録画像の長さよりも短ければ1記録画像の感
光体上の先端が現像ローラ位置に到達したとき、1記録
画像感光体上の後端は未だ現像工程にあり現像ローラが
清掃手段として働くことが出来ず、1記録画像の感光体
上の先端部の転写残り粉体は感光体にり清掃されること
がない。In this way, two rotations of the photoreceptor form one recorded image. However, in the process of repeatedly using such a photoreceptor, the circumference of the photoreceptor must be at least the length of one recorded image. In other words, if the circumference of the photoreceptor is shorter than the length of one recorded image, when the leading edge of one recorded image on the photoreceptor reaches the developing roller position, the rear end of the photoreceptor of one recorded image is still in the developing process. Since the developing roller cannot function as a cleaning means, the transfer residual powder at the leading end of the photoreceptor of one recorded image is not cleaned by the photoreceptor.
したがって感光体の周長、つまり外形を大きくせねばな
らないという欠点を有していると共に、2回転のうち1
回転は必ずHf1S工程として使用しなければならない
為感光体の使用効率が50%と極めて良くない。このよ
うなことから、速度を遅くせねばならない等の問題を有
していると共に現像ローラのバイアスを変化させる為、
バイアス電源を2個用意しなければならないなどの問題
を有している。また、2成分現像剤を使用した反転現像
プロセスの電子写真装置でも上記従来例の説明で述べた
門例にならい、第8図に示すごとく転写工程と帯電工程
の間口に清掃工程を設けて、感光体清掃を行ってきてい
る。Therefore, it has the disadvantage that the circumference of the photoreceptor, that is, the outer diameter, has to be increased, and at the same time, one of the two rotations
Since the rotation must be used as a Hf1S process, the photoreceptor usage efficiency is only 50%, which is extremely poor. For this reason, there are problems such as having to slow down the speed and changing the bias of the developing roller.
There are problems such as the need to prepare two bias power supplies. Further, in an electrophotographic apparatus using a reversal development process using a two-component developer, a cleaning process is provided between the transfer process and the charging process as shown in FIG. 8, following the example described in the explanation of the conventional example above. The photoconductor has been cleaned.
又、従来例の電子写真記録装置の構成においては、上述
したような欠点以外に次のような問題も有している。In addition to the above-mentioned drawbacks, the structure of the conventional electrophotographic recording apparatus also has the following problems.
第1に清掃装置がある体積を専有してしまう為、転写部
材の搬送路に制限が生じることである。例えば、第8図
に示すように、転写部材の証送路は上記したにうな理由
でストレートバスになっている。First, since the cleaning device occupies a certain volume, there is a restriction on the conveyance path of the transfer member. For example, as shown in FIG. 8, the transfer path of the transfer member is a straight bus for the reasons mentioned above.
このため、装置内で転写部材がジャムした場合には、こ
のジャムした転写部材を除去する為に、搬送路を境にし
て上下に大きく分離せねばならないなどの問題がある。Therefore, when a transfer member is jammed in the apparatus, there is a problem in that in order to remove the jammed transfer member, the transfer member must be separated vertically with the conveyance path as a boundary.
しかも清掃手段の位置は、第8図の位置が清掃手段とし
て理想的な位置にあり、このため転写部材の搬送路もス
トレートパスにしなければならないのである。また、こ
のように転写部材の挿入方向と転写部材の排出方向が機
体の下方で、しかも全く逆方向であるため、例えばレー
ザプリンタのようなシステム機器の1つのコンポーネン
ト装置としては極めて不都合である。それは、CRTデ
ィスプレイに向って座った作業者にはその座った位置か
らみてプリント内容が判別出来ること、更に、すべての
機器が壁方向を背にして配置されうることなどは、ワー
ドプロセッサ等のシステムは器として当然のこととして
要求される特性の1つでおることによる。このため、上
記欠点を補うよう更に第3の従来例として第13図に示
すような装置も開発されている。Moreover, the position of the cleaning means as shown in FIG. 8 is an ideal position for the cleaning means, and therefore the conveyance path of the transfer member must also be a straight path. Further, since the insertion direction of the transfer member and the direction of ejection of the transfer member are below the machine body and in completely opposite directions, this is extremely inconvenient for use as a component device of a system device such as a laser printer, for example. This is because a worker sitting facing a CRT display can discern the printed content from his/her sitting position, and furthermore, all equipment can be placed with their back to the wall, so systems such as word processors are This is because it is one of the characteristics required as a matter of course for a vessel. Therefore, in order to compensate for the above drawbacks, a third conventional example of a device as shown in FIG. 13 has been developed.
即ち、この装置は感光体211回転帯電チャージャ22
、露光部23、現像工程と清(Φ工程を同時に行う現像
清掃装置24、転写チセージや26等が設けられており
、連続した画像形成時において帯電工程、露光工程を経
て静電潜像が形成されると共に前の画像形成時の転写残
り粉体がイ」着された感光体21が現像清掃装置24に
達すると、感光体21は現像ローラ27により静電潜像
の現像を行われる一方、転写残り粉体の除去を同時に行
われる事となる。That is, this device includes a photoreceptor 211 rotating charger 22
, an exposure section 23, a development and cleaning device 24 that performs the development process and cleaning (Φ process) at the same time, and a transfer charger 26, etc., are provided, and an electrostatic latent image is formed through the charging process and exposure process during continuous image formation. When the photoreceptor 21, on which transfer residual powder from the previous image formation has been deposited, reaches the developing and cleaning device 24, the electrostatic latent image is developed on the photoreceptor 21 by the developing roller 27. Removal of transfer residual powder will be performed at the same time.
つまり、1回目の画像形成工程終了後、転写残り粉体が
付着される感光体21は帯電ヂャージャ22により−V
Oに一様に帯電され次いで露光部23で静電潜像が形成
されるが、この時、転写残り粉体が付着されていても、
転写時の転写効率が80[%]程度であれば、転写残り
粉体による感光体21の被覆率は非常に少なく、しかも
粉体の粒子が10[JJInコ程度であるので、例え8
0[譚]スポットのレーザビームが照則されたとしても
、感光体21上に充分静電潜像が形成可能となる。そし
てこの俊、約V o / 2のバイアス電圧が印加され
る現像ローラ27の磁気ブラシとの固接にJ:り静電潜
像に粉体が付与され現像が行われる一方、転写残り粉体
が磁気ブラシに回収され清掃が行われる。That is, after the first image forming process is completed, the photoreceptor 21 to which the remaining transfer powder is attached is charged with -V by the charging charger 22.
O is uniformly charged, and then an electrostatic latent image is formed in the exposure section 23, but at this time, even if transfer residual powder is attached,
If the transfer efficiency at the time of transfer is about 80%, the coverage of the photoreceptor 21 by the powder remaining after transfer is very small.Moreover, since the powder particles are about 10[JJIn], for example,
Even if the laser beam is aimed at the zero spot, a sufficient electrostatic latent image can be formed on the photoreceptor 21. At this time, the developing roller 27 to which a bias voltage of approximately V o / 2 is applied is in fixed contact with the magnetic brush, and powder is applied to the electrostatic latent image to perform development. is collected by a magnetic brush and cleaned.
しかしながら、このような装置にあっては、転写チャー
ジp22による帯電時、転写残り粉体の付着部にあって
は第14図に示すように、多量の電荷22aが粉体層2
8を通過出来ず、その部分における帯電電荷は通常の1
/2程度となってしまう。尚、この場合、感光体21の
表面電位制御能力のめるスコロトロンチャージャを用い
れば、転写残り粉体層と感光体表面とはほぼ同一の表面
電位に保持されるが、表面電位制御能力の無いコロトロ
ンチャージャを用いると、感光体表面に比し転写残り粉
体層28は非常に高電位となってしまう。しかしいずれ
のタイプの転写チャージャを用いても、転写残り粉体の
付着部では感光体21は帯電されにくく、その表面電位
は現像バイアスとほぼ同程度しか無く、従って現像ロー
ラ27による感光体表面の清掃は、転写残り粉体が付着
される感光体の表面と、現像バイアス−V o / 2
との直接的な電位差によるものでは無く、磁気ブラシの
摺接時転写残り粉体周辺部の電荷と磁気ブラシの電位差
とにより、転写残り粉体が磁気ブラシ側に回収され行わ
れている。このため、磁気ブラシによる転写残り粉体の
回収は完全なものでは無く、連続して画像形成が行われ
た場合、清掃後も多少粉体が残留し、画像にカブリやゴ
ーストあるいは地汚れを生じ、画質が低下されるという
問題を有している。However, in such a device, when charging by the transfer charge p22, a large amount of charge 22a is generated on the powder layer 2 at the part where the transfer residual powder is attached, as shown in FIG.
8 cannot pass through, and the charge at that part is the normal 1
/2. In this case, if a scorotron charger that has the ability to control the surface potential of the photoreceptor 21 is used, the remaining transfer powder layer and the surface of the photoreceptor are held at almost the same surface potential, but if a scorotron charger that has the ability to control the surface potential of the photoreceptor 21 is used, If a tron charger is used, the untransferred powder layer 28 will have a very high potential compared to the surface of the photoreceptor. However, no matter which type of transfer charger is used, the photoreceptor 21 is difficult to be charged at the part where the transfer residual powder is attached, and its surface potential is only about the same level as the developing bias. Cleaning is performed on the surface of the photoreceptor to which the transfer residual powder is attached, and on the developing bias -Vo/2.
The untransferred powder is collected toward the magnetic brush side not by a direct potential difference between the magnetic brush and the magnetic brush, but by the electrical charge around the transferred untransferred powder when the magnetic brush comes into sliding contact with the magnetic brush and the potential difference between the magnetic brush and the untransferred powder. For this reason, the collection of transfer residual powder by the magnetic brush is not perfect, and if image formation is performed continuously, some powder may remain even after cleaning, causing fog, ghosts, or background smudges on the image. , there is a problem that the image quality is degraded.
(発明が解決しようとする問題点)
従来は、転写残り粉体が付着される部分にあっては感光
体の表面が帯電されにくく、現像工程と清掃工程とを同
時に行う場合、現像バイアスと、転写残り粉体が付着さ
れる感光体の表面電位との電位差が少なく、転写残り粉
体が現像ローラに回収されにくくなる。このためゴース
トやカブリ等による画質の低下を3Eいており、鮮明な
画像を得るためには、他の特別な精(吊手段を用いる必
要があり、装置の小型化あるいはメンテナンスの簡素化
等の取扱いの容易性という面での障害を生じている。(Problems to be Solved by the Invention) Conventionally, the surface of the photoreceptor is difficult to be charged in the area where the transfer residual powder is attached, and when the developing process and cleaning process are performed simultaneously, the developing bias is The potential difference between the surface potential of the photoreceptor to which the transfer residual powder is attached is small, and the transfer residual powder is difficult to be collected by the developing roller. For this reason, image quality is reduced by 3E due to ghosting, fogging, etc., and in order to obtain clear images, it is necessary to use other special techniques (hanging means), and measures such as downsizing the device or simplifying maintenance must be taken. This poses an obstacle in terms of ease of use.
そこで本発明は上記欠点を除去するもので、他の清掃手
段を用いる事無く同一の現像ローラにより現像工程及び
清(吊工程を同時に行う現像清掃装置により、転写残り
粉体を充分除去する事が出来、装置の小型化や、取扱い
の容易性を維持しつつ画質の向上を図る事が出来る画像
形成装置における現像清掃装置を提供する事を目的とす
る。Therefore, the present invention aims to eliminate the above-mentioned drawbacks, and uses a developing cleaning device that simultaneously performs the developing process and cleaning (hanging process) using the same developing roller without using any other cleaning means, making it possible to sufficiently remove the untransferred powder. An object of the present invention is to provide a developing and cleaning device for an image forming apparatus, which can improve image quality while maintaining compactness and ease of handling.
(問題点を解決するための手段)
本発明は上記問題点を解決するために、同時に行われる
現像清掃工程前に、転写残り粉体を感光体の高電位を保
持する非潜像領域に移動さゼるための誘導装置を設【プ
るものである。(Means for Solving the Problems) In order to solve the above problems, the present invention moves the untransferred powder to a non-latent image area of the photoreceptor that maintains a high potential before the development and cleaning process that is performed at the same time. It is equipped with a guidance device for folding.
(作 用)
本発明は上記手段により、清作時、転写残り粉体を感光
体の高電位部に誘導しておぎ、感光体の表面電位と現像
バイアスとの電位差により、転写残り粉体を現像ローラ
に容易に回収出来るようにしてあり、他の清掃手段を用
いる事無く現像清掃装置のみで現像と同時に清掃を確実
に行う事が出来、ひいては画質向上及び装置の小型化を
図る事が出来る。(Function) The present invention uses the above-mentioned means to guide the transfer residual powder to the high potential part of the photoreceptor during cleaning, and remove the transfer residual powder by the potential difference between the surface potential of the photoreceptor and the developing bias. It is designed so that it can be easily collected on the developing roller, and cleaning can be reliably performed at the same time as development using only the developing cleaning device without using any other cleaning means, and as a result, image quality can be improved and the device can be made more compact. .
(実施例)
以下本発明の一実施例を第1図ないし第6図を参照しな
がら説明する。図中31は筐体、32は静電潜像が形成
される潜像領域32a及び画像形成に寄与しない非潜像
領域32bとを有する画像担持体である感光体であり、
この感光体32の周囲には、順次感光体32を−Voに
一様に帯電する帯電チセージャ33、露光部34、現像
清掃装置436、転写チャージャ37、紙除電チャージ
ャ38、及び除電ランプ39が配設されている。そして
現像清掃装置36にあってはマグネットローラ(図示せ
ず)を内蔵し、現像バイアスVn (似しVt5=
Vo/2)が印加されるスリーブからなり、マイナス極
性に帯電される着色粉体及びキセリアからなる現像剤4
0をその周囲に付着して磁気ブラシ41を形成する現像
ローラ42前方に、感光体32に圧接される誘導装置で
あり、感光体32の潜像領域32a上の転写残り粉体4
5を非潜像領域32bに移動させるウレタンブレード4
3が設けられている。但し、このウレタンブレード43
は硬度60[度]であり、第3図に示すように感光体3
2表面との角度φ1は約20[度]とされる一方、感光
体32の長手方向に対する角度φ2は約25[度]であ
るし、その幅は約jO[%] 、感光体32との圧接に
J:るウレタンブレード43端部の喰込但は約1.8[
#]とされている。又、44はFQレンズ、46はポリ
ゴンミラー、47は転写部材Pの収納容器、48は給紙
ローラ、49はアライニングローラ、51は定着器、5
2はレーザビーム、53は排紙トレイである。尚この装
置にあっては、感光体周速: 6B、0 [m/sea
] 、感光体径:60.0[#]、感光体上のレーザ
ーパワー: 3.5[mW]に設定されている。(Embodiment) An embodiment of the present invention will be described below with reference to FIGS. 1 to 6. In the figure, 31 is a housing, 32 is a photoreceptor which is an image carrier having a latent image area 32a where an electrostatic latent image is formed and a non-latent image area 32b which does not contribute to image formation.
A charging charger 33 for uniformly charging the photoreceptor 32 to -Vo, an exposure section 34, a developing cleaning device 436, a transfer charger 37, a paper charger 38, and a charger lamp 39 are arranged around the photoreceptor 32. It is set up. The developing cleaning device 36 has a built-in magnet roller (not shown), and has a developing bias Vn (similar to Vt5=
A developer 4 consisting of a sleeve to which Vo/2) is applied and consisting of negatively charged colored powder and xeria.
This is a guide device that is pressed against the photoreceptor 32 in front of the developing roller 42, which forms a magnetic brush 41 by adhering 0 to the periphery of the developing roller 42.
5 to the non-latent image area 32b.
3 is provided. However, this urethane blade 43
has a hardness of 60 [degrees], and as shown in FIG.
The angle φ1 with the photoconductor 32 is about 20[degrees], while the angle φ2 with respect to the longitudinal direction of the photoconductor 32 is about 25[degrees], and its width is about jO[%]. The biting depth at the end of the urethane blade 43 for pressure welding is approximately 1.8[
#] is said to be. Further, 44 is an FQ lens, 46 is a polygon mirror, 47 is a storage container for the transfer member P, 48 is a paper feed roller, 49 is an aligning roller, 51 is a fixing device, 5
2 is a laser beam, and 53 is a paper discharge tray. In this device, the circumferential speed of the photoreceptor: 6B, 0 [m/sea
], photoreceptor diameter: 60.0 [#], and laser power on the photoreceptor: 3.5 [mW].
次に動作について述べる。印字が開始されると第4図に
示すように駆動モータにより感光体32及び現像ローラ
42や各ローラ等が動作する。同時に帯電チャージャ3
3及び除電ランプ39がオンされる。Next, we will discuss the operation. When printing is started, the photoreceptor 32, developing roller 42, each roller, etc. are operated by the drive motor as shown in FIG. Charger 3 at the same time
3 and the static elimination lamp 39 are turned on.
そして感光体32は回転速度Wラジアン/secで回転
され、帯電チャージャ33により潜像領域32a及び非
潜像領域の全面にわたり一様に−Voに帯電され、更に
露光部34でポリゴンミラー46により走査されるレー
ザビーム52により、その潜像領域32aにネガティブ
な静電潜像が形成される。この後感光体32は現像清掃
装置36に達し、先ずウレタンブレード43によりその
表面を固接されるが、この時潜像領域32a上に転写残
り粉体45は付着されておらず感光体32はそのまま現
像ローラ42に達する。尚ウレタンブレード43は絶縁
性である事から、感光体32に形成された静電潜像は全
く乱される事が無い。又、帯電チャージャ33がオンさ
れた後、θ1/W[秒] (θ1は帯電チャージャ33
と現像ローラ42との位相差である)後、現像ローラ4
2には現像バイアスVaが印加される。従って感光体は
、その回転に従い現像ローラ42周囲の磁気ブラシ41
により静電潜像に着色粉体を付与され現像される。−万
感光体32上の画像に同期して収納容器47より転写部
材Pが給紙ローラ48によりアライニングローラ49に
向って送り出される。更に転写部材Pはアライニングロ
ーラ49にレジストレーションされた複転写位置に移動
する。そして転写部材Pが像転写位置に至ると、つまり
現像バイアスVaが印加されてからθ3/W[秒] (
θ3は現像ローラ42と転写チャージャ37との位相差
である)経過すると、転写チャージヤ37及び紙除電チ
ャージャ38が同時にオンされる。これにより転写部材
Pの表面よりプラス電荷が印加され、転写部材Pの電位
が下降し、これにより感光体32上の粉体像の約80[
%]が転写部材P上に移動する。この後転写部材PはA
Cチャージャからなる紙除電チャージャ38により除電
され、感光体32より剥離され、更に定着器51の加熱
ローラに挟持される。ここで転写部材Pの粉体像は溶融
し転写部材Pに定着され、この俊装置外に排出され、排
紙トレイ53上に積載される。尚以上にあっては・感光
体32にあける各工程は第5図のα)→■→■→Ω)迄
終了している。The photoreceptor 32 is then rotated at a rotational speed of W radian/sec, and is uniformly charged to -Vo over the entire surface of the latent image area 32a and non-latent image area by the charging charger 33, and then scanned by the polygon mirror 46 in the exposure section 34. A negative electrostatic latent image is formed in the latent image area 32a by the laser beam 52. After this, the photoconductor 32 reaches the developing and cleaning device 36, and its surface is first firmly attached by the urethane blade 43, but at this time, the transfer residual powder 45 is not attached to the latent image area 32a, and the photoconductor 32 is It reaches the developing roller 42 as it is. Since the urethane blade 43 is insulative, the electrostatic latent image formed on the photoreceptor 32 is not disturbed at all. Also, after the charger 33 is turned on, θ1/W [seconds] (θ1 is the charger 33
and the developing roller 42), then the developing roller 4
2, a developing bias Va is applied. Therefore, as the photoreceptor rotates, the magnetic brush 41 around the developing roller 42
Coloring powder is applied to the electrostatic latent image and developed. - The transfer member P is sent out from the storage container 47 toward the aligning roller 49 by the paper feed roller 48 in synchronization with the image on the photoconductor 32. Further, the transfer member P moves to the double transfer position registered to the aligning roller 49. Then, when the transfer member P reaches the image transfer position, that is, after the development bias Va is applied, θ3/W [seconds] (
(θ3 is the phase difference between the developing roller 42 and the transfer charger 37) After the elapse of time, the transfer charger 37 and the paper charger 38 are turned on at the same time. As a result, a positive charge is applied from the surface of the transfer member P, and the potential of the transfer member P decreases.
%] moves onto the transfer member P. After this, the transfer member P is A
The charge is removed by a paper charger 38 consisting of a C charger, peeled off from the photoreceptor 32, and further held between the heating rollers of the fixing device 51. Here, the powder image on the transfer member P is melted and fixed on the transfer member P, and is discharged from the apparatus and stacked on the paper discharge tray 53. In the above, each step of drilling the photoreceptor 32 has been completed up to α)→■→■→Ω) in FIG.
そこで第5図(へ)の転写終了後、続けてもう1シ一ト
印字が行われる場合にお(プる感光体32上の工程につ
いて述べる。第5図0)の転写終了後、感光体 。Therefore, when one more sheet is printed after the transfer shown in FIG. .
32は現像時の約20[%]の粉体が転写残り粉体45
として感光体32の潜像領1ti32aに付着されたま
ま除電ランプ39に達し、第5図0に示すように吸容電
荷をほとんど減衰され、次いで帯電チャージャ33によ
り第5図0)′ に示すように再度帯電される。32, about 20 [%] of the powder during development is transfer residual powder 45
It reaches the static eliminating lamp 39 while being attached to the latent image area 1ti32a of the photoreceptor 32, and the absorbed charge is almost attenuated as shown in FIG. is charged again.
但し転写残り粉体45付着部にあっては感光体32の表
面電位は転写残り粉体45が付着されていない部分の半
分の−Vo/2程度にしか帯電されず、感光体32の潜
像領域32aには−Voの高電位部と、V o / 2
の低電位部とが混在することになる。However, the surface potential of the photoconductor 32 in the area where the transfer residual powder 45 is attached is only about -Vo/2, which is half of the area where the transfer residual powder 45 is not attached, and the latent image on the photoconductor 32 is The region 32a includes a high potential part of -Vo and a V o /2
This results in a mixture of low potential parts.
この後感光体32は、その回転に従い第5図■′に示す
ようにレーザビーム52により潜像領域32aにネガテ
ィブな潜像を形成され、ウレタンブレード43に達する
。そしてウレタンブレード43が感光体32表面を摺接
すると、潜像領域32a上の転写残り粉体45は、第2
図矢印工方向及び矢印ン方向に示ずようにウレタンブレ
ード43に沿って高電位部である感光体32両端部の非
潜像領域32bに誘導される。(第5図0)尚前述のよ
うにこのウレタンブレード43との摺接により、感光体
32に形成8°れた潜像が乱されるという事tよ無い。Thereafter, as the photoreceptor 32 rotates, a negative latent image is formed in the latent image area 32a by the laser beam 52, as shown in FIG. 5, and reaches the urethane blade 43. When the urethane blade 43 slides on the surface of the photoreceptor 32, the untransferred powder 45 on the latent image area 32a is removed from the second
The light is guided along the urethane blade 43 to the non-latent image areas 32b at both ends of the photoreceptor 32, which are high potential parts, as shown in the direction of the arrow and the direction of the arrow in the figure. (FIG. 50) As mentioned above, the sliding contact with the urethane blade 43 does not disturb the 8° latent image formed on the photoreceptor 32.
この様な状態で第6図に承りような表面電位を有する感
光体32が現像ローラ42に達すると、第5図■′に示
すように潜像領域32aにあっては現像ローラ42周囲
の磁気ブラシ41により−VERの電位を有する静電潜
像と着色粉体を付与され現像される。但し、V o /
2程度の電位を有する転写残り粉体45が付着してい
た部分は現像バイアスVBとの電位差がはとIυど無く
、磁気ブラシ41との摺接により着色粉体が付着するお
それが無い。一方、表面電位が−Voの非潜像領域32
bにあっては現像バイアスVaとの電位差により磁気ブ
ラシ41の摺接により、誘導され集積されている転写残
り粉体45が現像ローラ42に回収され清銘される事と
なる。この後1枚目の印字の時と同様第5図0)に示す
ように感光体32は転写工程を経て第5図0に示すよう
に除電され、次の印字可能とされる一方、粉体像を転写
された転写部材Pは剥離工程、定着工程を経て排紙1〜
レイ53上に積載され2枚目の印字を終了する。そして
この後は以上の工程を必要回数更に繰り返す事となる。In this state, when the photoreceptor 32 having a surface potential as shown in FIG. An electrostatic latent image having a potential of -VER and colored powder are applied by the brush 41 and developed. However, V o /
The portion to which the transfer residual powder 45 having a potential of about 2 was attached has no significant potential difference Iυ with the developing bias VB, and there is no risk of colored powder adhering due to sliding contact with the magnetic brush 41. On the other hand, a non-latent image area 32 with a surface potential of -Vo
In b, due to the potential difference with the developing bias Va, the magnetic brush 41 slides into contact with the magnetic brush 41, and the accumulated transfer residual powder 45 is collected by the developing roller 42 and cleaned. Thereafter, the photoreceptor 32 undergoes a transfer process, as shown in FIG. 50, as in the case of printing on the first sheet, and is neutralized as shown in FIG. 50, making it ready for the next printing. The transfer member P to which the image has been transferred passes through a peeling process and a fixing process, and is then discharged from paper sheets 1 to 1.
The paper is stacked on the tray 53 and printing of the second sheet is completed. After this, the above steps are repeated as many times as necessary.
即ち、感光体32にあっては第5図のω′→■′→0→
■′→0)→0→■′を繰り返す事となる。次に最終シ
ートの印字を終了し、各装置の動作を停止する場合につ
いて第4図を参照しながら述べる。最終シート印字の作
像工程が終了し、つまり最終シート印字分のレーザビー
ムの停止後、(θ1+θ3)/W[秒] (θ3は現像
ローラ42と転写チャージャ37の位相差である。)経
過すると最終シート印字分の現像画像が転写完了となる
ので転写チャーリャがオフされ、この後しばらくして紙
除電チャージャ38がオフされる。That is, for the photoreceptor 32, ω′→■′→0→ in FIG.
■' → 0) → 0 → ■' will be repeated. Next, referring to FIG. 4, a case will be described in which the printing of the final sheet is completed and the operation of each device is stopped. When (θ1+θ3)/W [seconds] (θ3 is the phase difference between the developing roller 42 and the transfer charger 37) elapses after the image forming process for printing on the final sheet is completed, that is, after the laser beam for printing on the final sheet has stopped. Since the transfer of the developed image printed on the final sheet is completed, the transfer charger is turned off, and after a while, the paper electricity removal charger 38 is turned off.
そしてレーザビームの停止後感光体32が1回転すると
帯電チャージャ33がオフされ、その後θ1/W[秒]
経過すると現像バイアスVaがオフされる。つまり、こ
の間感光体32は帯電後に露光される事無く、全面が高
電位に保持された状態で現像バイアスVBが印加される
現像ローラ42に達するのでウレタンブレード43によ
り非潜像領域に誘導された転写残り粉体と共に尚潜像領
域中に残留される粉体をも現像ローラ42側に回収され
完全に清掃される事となる。そして現像バイアスVaオ
フ後θ3/W[秒] (θは現像ローラ42と除電ラン
プ39の位相差である。)経過すると、駆動モータ及び
除電ランプ39をオフする。この最後の除電工程ににり
感光体32は完全に除電され、残留電荷によって誘起さ
れる画惟ボケ等の画像悪化要因がとり除かれる。この様
に各装置は停止されるが、又、次の印字命令により駆動
モータ、帯電チャージャ33、除電ランプ39がほぼ同
時にオンされるが、現像バイアスVa感光体32の帯電
部が現像ローラ42に到達するまでオンされない。従っ
て未帯電部が現像されてしまうということはない。即ち
印字開始時も印字終了時も像形成領域以外への像形成を
行わないので、感光体32に過度の粉体が付着される事
が無く、印字画像に悪影響を与える事が無い。When the photoreceptor 32 rotates once after the laser beam stops, the charger 33 is turned off, and then θ1/W [seconds]
After the elapse of time, the developing bias Va is turned off. In other words, during this period, the photoreceptor 32 is not exposed to light after being charged, and reaches the developing roller 42 to which the developing bias VB is applied with the entire surface held at a high potential, so that the photoreceptor 32 is guided to a non-latent image area by the urethane blade 43. Along with the transfer residual powder, the powder remaining in the latent image area is also collected to the developing roller 42 side and completely cleaned. Then, when θ3/W [seconds] (θ is the phase difference between the developing roller 42 and the static elimination lamp 39) have elapsed after the developing bias Va is turned off, the drive motor and the static elimination lamp 39 are turned off. In this final charge removal step, the photoreceptor 32 is completely removed from charge, and image deterioration factors such as image blur caused by residual charges are removed. Although each device is stopped in this way, the drive motor, charging charger 33, and static elimination lamp 39 are turned on almost simultaneously by the next printing command, but the charging portion of the developing bias Va photoreceptor 32 is transferred to the developing roller 42. It will not turn on until it reaches. Therefore, the uncharged area will not be developed. That is, since image formation is not performed in areas other than the image forming area both at the start of printing and at the end of printing, excessive powder does not adhere to the photoreceptor 32 and does not adversely affect the printed image.
このように構成すれば、感光体32上の転写残り粉体4
5は現像ローラ42に達する+’+ffに高電位を有す
る非潜像領域32bに誘導されているので、現像ローラ
42による潜像の現像工程と同時に現像バイアスと非潜
像領域32bの電位差により、転写残り粉体45は容易
かつ確実に現像ローラ42に回収され清掃され、転写残
り粉体45による地力ブリやゴーストおるいは汚れ等を
防止出来、画質が向上される。With this configuration, the transfer remaining powder 4 on the photoreceptor 32
5 is guided to the non-latent image area 32b having a high potential of +'+ff which reaches the developing roller 42. Therefore, at the same time as the developing process of the latent image by the developing roller 42, due to the potential difference between the developing bias and the non-latent image area 32b, The untransferred powder 45 is easily and reliably collected by the developing roller 42 and cleaned, and it is possible to prevent ground blur, ghost, stain, etc. due to the untransferred powder 45, and the image quality is improved.
又、転写残り粉体45を除去するための特別な清(W装
置が不要となる事から装置小型化が可能となり、メンテ
ナンス性の低下も防止される。更に特別な清掃装置を除
去し、第1図に示すように転写部材Pの搬送路がこの進
行方向に対して感光体32を囲むようにL時形になって
いるため転写部材Pの排出方向が感光体32の斜め上方
に位置し、又、排出された転写部材Pの処理方向及び内
容の判別、判読方向が一致され、ワードプロセッサ等の
システム機器のコンポーネントとしても理想的な形状と
なる。In addition, since a special cleaning device (W) for removing the transfer residual powder 45 is not required, the device can be made smaller and maintenance efficiency is also prevented. As shown in FIG. 1, the conveyance path of the transfer member P is in an L-shape surrounding the photoreceptor 32 with respect to the traveling direction, so that the discharge direction of the transfer member P is located diagonally above the photoreceptor 32. Furthermore, the processing direction and content discrimination/reading direction of the ejected transfer member P are matched, and the shape is ideal as a component of a system device such as a word processor.
尚この発明は上記実施例に限定されず種々設計変更可能
であり、例えば露光手段としてライト・エミツテツド・
ダイオードアレイのような発光素子や光スイツチング素
子を用いる等しても良い。Note that this invention is not limited to the above-mentioned embodiments, and can be modified in various ways. For example, light emitted light may be used as the exposure means.
A light emitting element such as a diode array or an optical switching element may also be used.
又、転写残り粉体を移動させる誘導装置の材質も静電′
g!i像を乱さず、又感光体表面を傷つけない・よう弾
性を有する絶縁体であればウレタンに限定されない。更
に誘導装置の形状や感光体への圧接角度等も全く任意で
あり、第7図に示す他の変形例のように転写残り粉体を
矢印Zに示すように感光体54の一側端に誘導するよう
なウレタンブレード56であっても良い。尚このように
すれば感光体54の一端にのみ非潜像領域54bを設け
れば良いので感光体54有効部である潜像領域を拡大出
来る。In addition, the material of the guiding device that moves the transfer residual powder is also electrostatic.
g! The material is not limited to urethane as long as it is an elastic insulator that does not disturb the i-image or damage the surface of the photoreceptor. Furthermore, the shape of the guiding device and the angle at which it presses against the photoreceptor are completely arbitrary.As shown in another modification shown in FIG. It may also be a urethane blade 56 that guides. In this case, since it is only necessary to provide the non-latent image area 54b at one end of the photoreceptor 54, the latent image area which is the effective part of the photoreceptor 54 can be enlarged.
以上説明したように本発明によれば、誘導装置により現
像清掃工程の前に転写残り粉体を画像担持体の非潜像領
域に集積しであるので、同一の現像ローラにより現像工
程及び清lid工程を同時に行う際、転写残り粉体が現
像ローラにより容易かつ確実に清掃されるので従来生じ
ていた地力ブリ、地汚れ、ゴースト等が防止され良質の
画像を得る事が出来る。又、従来用いられていた特別な
清抑装置が不要となる事から装置のより小型化が可能と
なり、レーザプリンタのようなシステム機器の1つのコ
ンポーネント装置としてはより好ましい形状とされる。As explained above, according to the present invention, the transfer residual powder is accumulated in the non-latent image area of the image bearing member before the development and cleaning process by the guiding device, so that the same developing roller is used for both the development process and the cleaning process. When the steps are performed at the same time, the powder remaining after transfer is easily and reliably cleaned by the developing roller, thereby preventing background blurring, scumming, ghosting, etc. that conventionally occur, and making it possible to obtain high-quality images. Furthermore, since the special cleaning and suppressing device that has been used in the past is no longer necessary, the device can be made more compact, and the shape is more preferable as a component device of a system device such as a laser printer.
第1図ないし第6図は本発明の一実施例を示し、第1図
はその概略構成図、第2図はそのウレタンブレードが摺
接される感光体を示す斜視図、第3図はその感光体に対
するウレタンブレードの配置位置を示す説明図、第4図
はその印字工程を示ずタイミングチャート、第5図はそ
の各印字工程を示す説明図、第6図はその現像清掃時に
おける感光体の表面電位を示す説明図、第7図は本発明
の他の変形例の感光体に対るウレタンブレードの設置位
置を示す上面図、第8図ないし第11図は第1の従来の
装置を示し第8図はその概略構成図、第9図はその二成
分現像剤による正規現像の各印字工程を示す説明図、第
10図はその二成分現像剤による反転現像の各印字工程
を示す説明図、第11図はその一成分現像剤による反転
現像の各印字工程を示す説明図、第12図は第2の従来
例の各印字i程を示す説明図、第13図及び第14図は
第3の従来例を示し第13図はその概略構成図、第14
図はその転写残り粉体を有する感光体の帯電時を示す説
明図である。
32・・・感光体 33・・・帯電チャージ
ャ34・・・露光部 36・・・現像清掃工
程40・・・現像剤 41・・・磁気ブラシ
42・・・現像ローラ 43・・・ウレタンブレ
ード45・・・転写残り粉体1 to 6 show an embodiment of the present invention, FIG. 1 is a schematic configuration diagram thereof, FIG. 2 is a perspective view showing a photoreceptor to which the urethane blade is slidably contacted, and FIG. 3 is a perspective view thereof. An explanatory diagram showing the arrangement position of the urethane blade with respect to the photoconductor, FIG. 4 is a timing chart that does not show the printing process, FIG. 5 is an explanatory diagram showing each printing process, and FIG. 6 is the photoconductor during development and cleaning. FIG. 7 is a top view showing the installation position of the urethane blade with respect to the photoreceptor of another modification of the present invention, and FIGS. 8 to 11 show the first conventional device. FIG. 8 is a schematic diagram of the configuration, FIG. 9 is an explanatory diagram showing each printing process of regular development using the two-component developer, and FIG. 10 is an explanatory diagram showing each printing process of reversal development using the two-component developer. 11 is an explanatory diagram showing each printing step of reversal development using the one-component developer, FIG. 12 is an explanatory diagram showing each printing step of the second conventional example, and FIGS. 13 and 14 are The third conventional example is shown in Fig. 13, its schematic configuration diagram, and Fig. 14.
The figure is an explanatory diagram showing the state in which the photoreceptor having the transfer residual powder is charged. 32... Photoreceptor 33... Charger 34... Exposure section 36... Development and cleaning process 40... Developer 41... Magnetic brush 42... Developing roller 43... Urethane blade 45 ... transfer residual powder
Claims (1)
画像担持体の前記潜像の現像工程及び前記転写残り粉体
の清掃工程を、同一の現像ローラを用いて同時に行うも
のにおいて、前記現像清掃工程前に前記転写残り粉体を
前記画像担持体の非潜像領域に誘導する誘導装置を具備
することを特徴とする画像形成装置における現像清掃装
置。 2、誘導装置が画像担持体とほぼ同一幅で、移動方向に
対し勾配を有するよう前記画像担持体に圧接される絶縁
性ブレードからなる事を特徴とする特許請求の範囲第1
項記載の画像形成装置における現像清掃装置。 3、画像担持体の非潜像領域の表面電位の絶対値が、現
像ローラのバイアス電位の絶対値より大きい事を特徴と
する特許請求の範囲第1項又は第2項のいづれかに記載
の画像形成装置における現像清掃装置。[Scope of Claims] 1. The development process of the latent image and the cleaning process of the residual transfer powder of the image bearing member, on which the latent image is formed and the transfer residual powder is attached, are performed using the same developing roller. A development and cleaning device for an image forming apparatus, characterized in that the development and cleaning device is equipped with a guide device for guiding the transfer residual powder to a non-latent image area of the image carrier before the development and cleaning step. 2. Claim 1, characterized in that the guiding device is comprised of an insulating blade that has approximately the same width as the image carrier and is pressed against the image carrier so as to have a slope with respect to the moving direction.
A developing and cleaning device in the image forming apparatus described in 1. 3. The image according to claim 1 or 2, wherein the absolute value of the surface potential of the non-latent image area of the image carrier is larger than the absolute value of the bias potential of the developing roller. A developing cleaning device in a forming device.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP22484886A JPS6380287A (en) | 1986-09-25 | 1986-09-25 | Developing and cleaning device for image forming device |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP22484886A JPS6380287A (en) | 1986-09-25 | 1986-09-25 | Developing and cleaning device for image forming device |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS6380287A true JPS6380287A (en) | 1988-04-11 |
Family
ID=16820112
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP22484886A Pending JPS6380287A (en) | 1986-09-25 | 1986-09-25 | Developing and cleaning device for image forming device |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS6380287A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH0830162A (en) * | 1994-07-20 | 1996-02-02 | Sharp Corp | Image forming device |
-
1986
- 1986-09-25 JP JP22484886A patent/JPS6380287A/en active Pending
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH0830162A (en) * | 1994-07-20 | 1996-02-02 | Sharp Corp | Image forming device |
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