JPH01195459A - Image forming device - Google Patents
Image forming deviceInfo
- Publication number
- JPH01195459A JPH01195459A JP63018558A JP1855888A JPH01195459A JP H01195459 A JPH01195459 A JP H01195459A JP 63018558 A JP63018558 A JP 63018558A JP 1855888 A JP1855888 A JP 1855888A JP H01195459 A JPH01195459 A JP H01195459A
- Authority
- JP
- Japan
- Prior art keywords
- image
- transfer
- developer
- toner
- transfer roller
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 239000000463 material Substances 0.000 claims abstract description 20
- 230000005684 electric field Effects 0.000 claims description 5
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 abstract description 14
- 239000003795 chemical substances by application Substances 0.000 abstract description 8
- 230000002209 hydrophobic effect Effects 0.000 abstract description 7
- 239000000377 silicon dioxide Substances 0.000 abstract description 7
- 238000011109 contamination Methods 0.000 abstract description 2
- 230000002950 deficient Effects 0.000 abstract 1
- 238000004140 cleaning Methods 0.000 description 9
- 239000002245 particle Substances 0.000 description 8
- 238000002474 experimental method Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 239000000654 additive Substances 0.000 description 2
- 230000000996 additive effect Effects 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 229920006311 Urethane elastomer Polymers 0.000 description 1
- 238000005411 Van der Waals force Methods 0.000 description 1
- 238000005054 agglomeration Methods 0.000 description 1
- 230000002776 aggregation Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 239000013013 elastic material Substances 0.000 description 1
- 229920001971 elastomer Polymers 0.000 description 1
- SZVJSHCCFOBDDC-UHFFFAOYSA-N iron(II,III) oxide Inorganic materials O=[Fe]O[Fe]O[Fe]=O SZVJSHCCFOBDDC-UHFFFAOYSA-N 0.000 description 1
- 238000004898 kneading Methods 0.000 description 1
- 230000005415 magnetization Effects 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 239000000049 pigment Substances 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 238000010298 pulverizing process Methods 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920002050 silicone resin Polymers 0.000 description 1
- 238000010186 staining Methods 0.000 description 1
- 229920003048 styrene butadiene rubber Polymers 0.000 description 1
- 229920001909 styrene-acrylic polymer Polymers 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 229910000859 α-Fe Inorganic materials 0.000 description 1
Classifications
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
- G03G13/00—Electrographic processes using a charge pattern
- G03G13/06—Developing
- G03G13/08—Developing using a solid developer, e.g. powder developer
Abstract
Description
【発明の詳細な説明】
（１）発明の目的
（産業上の利用分野）
この発明は静電複写機、同プリンタなど、静電転写プロ
セスを利用する画像形成装置に関するものである。DETAILED DESCRIPTION OF THE INVENTION (1) Object of the Invention (Field of Industrial Application) The present invention relates to an image forming apparatus using an electrostatic transfer process, such as an electrostatic copying machine and a printer thereof.
（発明の詳細な説明）
走行する像担持体に、弾性材料から・なる転写ローラを
当接ないしはごく近接配置して、これら両者間に紙など
シート状の転写材を通過させ、この転写ローラに転写バ
イアスを印加して、像担持体表面に形成された可転写の
トナー像を転写材に転写するような画像形成装置がすで
に提案されている。(Detailed Description of the Invention) A transfer roller made of an elastic material is placed in contact with or very close to a moving image carrier, and a sheet-like transfer material such as paper is passed between the two, and the transfer roller is An image forming apparatus has already been proposed that applies a transfer bias to transfer a transferable toner image formed on the surface of an image carrier onto a transfer material.
このような画像形成装置にあっては、画像形成作業中常
時転写バイアスを印加する場合は勿論。Of course, in such an image forming apparatus, a transfer bias is constantly applied during the image forming operation.
転写材が通過する場合にのみ間欠的に転写バイアスをか
けても、各部材の材質、機械的な構造あるいは残留電荷
の存在などのため、転写ローラの表面がトナーその他の
異物によって汚染されることを免かれず、これによる、
後続する転写材の裏汚れ、実質的な印加バイアスの不足
による転写効率の低下に基因する画質の劣化を生ずるお
それを免かれなかった。Even if a transfer bias is applied intermittently only when the transfer material passes, the surface of the transfer roller may become contaminated with toner or other foreign matter due to the material of each member, mechanical structure, or the presence of residual electric charge. Due to this,
There is a risk that the image quality will deteriorate due to contamination on the back of the subsequent transfer material and a decrease in transfer efficiency due to a substantial lack of applied bias.
このような欠点を回避すべく、像担持体と転写ローラと
の間に転写材が存在しない非転写時に、転写時とは反対
極性の逆バイアスを印加して、転写ローラに付着したト
ナーを像担持体に転移させるような手段が提案されてい
る。In order to avoid such drawbacks, a reverse bias with a polarity opposite to that during transfer is applied during non-transfer when no transfer material is present between the image carrier and the transfer roller, so that the toner adhering to the transfer roller is removed from the image. Means for transferring to a carrier have been proposed.
しかしながら、近来、この種の画像形成装置においては
、多色コピー、カラーコピーなどが次第に汎用されるよ
うになってきており、これにともなって、トナー、とく
にカラートナーには、鮮明な色彩を得るために非磁性ト
ナーが賞用され、このために、非磁性トナーと磁性キャ
リヤとからなる２成分系現像剤が、この種現像剤による
現像方法の進展と相まって、使用されるようになってき
ている。However, in recent years, multicolor copying, color copying, etc. have become increasingly common in this type of image forming apparatus, and with this, toners, especially color toners, have become increasingly popular. For this reason, non-magnetic toner has been used, and for this reason, two-component developers consisting of non-magnetic toner and magnetic carrier have come into use as development methods using this type of developer have progressed. There is.
ところで、このような非磁性トナーと磁性キャリヤとか
らなる２成分系現像剤を、前述のような、転写ローラを
使用する装置に適用した場合、転写ローラに付着する現
像剤は磁性キャリヤを含まないトナーのみであるので、
流動性が劣っていて凝集しやすく、このため、非転写時
に逆バイアスを印加してもこのトナーは充分像担持体に
転移し難いという問題があった。By the way, when such a two-component developer consisting of non-magnetic toner and magnetic carrier is applied to an apparatus using a transfer roller as described above, the developer adhering to the transfer roller does not contain the magnetic carrier. Since it is only toner,
The toner has poor fluidity and is prone to agglomeration, which causes the problem that even if a reverse bias is applied during non-transfer, the toner is difficult to be sufficiently transferred to the image carrier.
とくに、ジャムが発生した場合、原稿画像の大きさに比
して小さいサイズの転写材を使用した場合などにおいて
、転写材の存在しない領域では。Especially in areas where there is no transfer material, such as when a jam occurs or when a transfer material that is smaller than the size of the original image is used.
像担持体が直接転写ローラに当接することになるので、
トナー像が転写ローラに直接転写されることになって該
ローラを著るしく汚染し、逆バイアスのみでこれを除去
することは不可能であり、このようなことが、この種の
画像形成装置の実用化を阻む要因となっていたのである
。Since the image carrier comes into direct contact with the transfer roller,
This type of image forming apparatus This was a factor that hindered its practical application.
本発明は、以上にような事態に鑑みてなされたものであ
って、転写手段として転写ローラを利用する画像形成装
置において、該転写ローラの被クリーニング性を向上し
て、種々な現像剤を使用して、常時安定して良好な画像
を得られるような画像形成装置を提供することを目的と
するものである。The present invention has been made in view of the above-mentioned situation, and it is possible to improve the cleaning properties of the transfer roller in an image forming apparatus that uses a transfer roller as a transfer means, and to use various types of developers. It is an object of the present invention to provide an image forming apparatus that can always stably obtain good images.
（２）発明の構成
（課題を解決する技術手段、その作用）上記の目的を達
成するため、本発明は、像担持体と、これに圧接する転
写ローラとをそなえ、両者間を通過する転写材に、像担
持体表面の静電潜像を顕像化してなるトナー像を転写す
るとともに、非転写時にはトナーを転写ローラから像担
持体に転移させる方向の電界を形成する画像形成装置に
おいて、像担持体の静電潜像を顕像化してトナー像を形
成するため、流動性付与剤を外添した現像剤を用いるこ
とを特徴とするものである。(2) Structure of the invention (technical means for solving the problem and its operation) In order to achieve the above object, the present invention comprises an image bearing member and a transfer roller that is in pressure contact with the image carrier, and a transfer roller that passes between the two. In an image forming apparatus that transfers a toner image formed by visualizing an electrostatic latent image on the surface of an image carrier onto a material, and forms an electric field in a direction to transfer the toner from a transfer roller to the image carrier when not transferred, In order to form a toner image by visualizing an electrostatic latent image on an image carrier, a developer to which a fluidity imparting agent is externally added is used.
このように構成することによって、転写ローラを利用し
て転写を行なう画像形成装置において。With this configuration, in an image forming apparatus that performs transfer using a transfer roller.
転写ローラのクリーニングを有効に実行することができ
、長期にわたって安定的に良質の画像を得ることができ
る。The transfer roller can be cleaned effectively, and high-quality images can be stably obtained over a long period of time.
（実施例の説明）
第１ｒｇＪは本発明を適用するに適した画像形成装置の
要部の概略側面図である。(Description of Embodiments) 1rgJ is a schematic side view of the main parts of an image forming apparatus suitable for applying the present invention.
その構成、作用について略述すると、紙面に垂直方向に
のび、矢印Ａ方向に回転する円筒状に形成された像担持
体ｌの表面感光層が、−成帯電器４によって一様に帯電
され、これに、不図示の原稿画像からの反射光像あるい
は、画像変調されたレーザビームなどが投射される露光
部５によって静電ｗｉ像が形成される。To briefly describe its structure and operation, the photosensitive layer on the surface of the image carrier l, which is formed in a cylindrical shape and extends perpendicularly to the plane of the paper and rotates in the direction of arrow A, is uniformly charged by the charger 4; An electrostatic wi image is formed on this by an exposure section 5 onto which a reflected light image from a document image (not shown) or an image-modulated laser beam is projected.
ついで、この潜像が現像装置６に達し、ここでトナーが
供給されてトナー像が形成される。This latent image then reaches the developing device 6, where toner is supplied to form a toner image.
像担持体の走行方向にみて現像装置の下流側には、導電
性の弾性転写ローラ２が像担持体１に当接して転写部位
を形成しており、該ローラに高圧電源３によって、転写
時には像担持体のトナーを転写材に転写させる方向の、
非転写時にはこれと逆方向の電界を形成するように転写
バイアスを印加するものとする。On the downstream side of the developing device when viewed in the running direction of the image carrier, a conductive elastic transfer roller 2 is in contact with the image carrier 1 to form a transfer area, and a high voltage power source 3 is applied to the roller during transfer. The direction in which the toner on the image carrier is transferred to the transfer material,
During non-transfer, a transfer bias is applied to form an electric field in the opposite direction.
転写材（不図示）は搬送路７をとおって矢印Ｂ方向に進
行し、像担持体表面のトナー像とタイミングを合せて前
記転写部位に達し、前記転写バイアスの作用でトナー像
が転写材に転移し、ついで像担持体から分離されて不図
示の定着部位に搬送される。The transfer material (not shown) advances in the direction of arrow B through the conveyance path 7 and reaches the transfer site in synchronization with the toner image on the surface of the image carrier, and the toner image is transferred onto the transfer material by the action of the transfer bias. The image is transferred, then separated from the image carrier and conveyed to a fixing site (not shown).
転写材が転写部位を通過したことを検知したのち、電源
３の極性は切替えられて電界の方向が反対となり、転写
ローラのトナーは像担持体に転移して該ローラがクリー
ニングされ、転写に寄与せず像担持体に残った残留トナ
ーとともにクリーニング装置８に至って像担持体から除
去され、さらに、前除電ランプ９によって残留電荷も除
去されて、次の画像形成工程の準備がなされることにな
る。After detecting that the transfer material has passed the transfer site, the polarity of the power source 3 is switched to reverse the direction of the electric field, and the toner on the transfer roller is transferred to the image carrier, cleaning the roller and contributing to transfer. The residual toner remaining on the image carrier is removed from the image carrier by the cleaning device 8, and the residual charge is also removed by the pre-discharging lamp 9 to prepare for the next image forming process. .
このような装置の使用にあたり、本発明においては、現
像剤に、疎水性シリカを可とする、流動性付与剤を外添
した現像剤を用いたことを特徴とするものであって、こ
れによって、転写ローラのクリーニング性を顕著に向上
させ、転写材の汚れや転写不良を防止して良質の画像を
得ることを可能とした。When using such an apparatus, the present invention is characterized by using a developer to which a fluidity imparting agent, which allows hydrophobic silica, is externally added. This significantly improved the cleaning performance of the transfer roller, preventing stains on the transfer material and poor transfer, making it possible to obtain high-quality images.
つぎに実験例について説明する。Next, an experimental example will be explained.
上述のような構成のレーザビームプリンタを用い、像担
持体表面感光層を一７００Ｖに帯電してこれに露光部５
で画像偏重されたレーザビームを投射して潜像を形成し
た。Using a laser beam printer configured as described above, the photosensitive layer on the surface of the image carrier is charged to -700V and exposed to the exposure section 5.
A latent image was formed by projecting an image-biased laser beam.
ついで、現像装置６によってこの潜像を顕像化し、さら
に、像担持体１に転写ローラ２を圧接した転写部位に転
写材を通過させてトナー像を転写材に転写した。Next, this latent image was visualized by the developing device 6, and the toner image was transferred to the transfer material by passing the transfer material through a transfer portion where the transfer roller 2 was pressed against the image carrier 1.
転写ローラは、少なくともその表面を導電性ゴムで構成
してあり、その抵抗は１０２〜１０”Ωが適当であり、
本例では１０％Ωの導電性ウレタンゴムを使用した。The transfer roller has at least its surface made of conductive rubber, and its resistance is suitably 102 to 10"Ω.
In this example, 10% Ω conductive urethane rubber was used.
この転写ローラを、像担持体に対して、総圧６００ｇｒ
で圧接し、反転現像において、該ローラに直流＋５００
Ｖを印加して良好な転写が得られた。This transfer roller is applied to the image carrier under a total pressure of 600 gr.
During reversal development, direct current +500
Good transfer was obtained by applying V.
現像剤としては、２成分系現像剤を使用し、磁性キャリ
ヤとしては、シリコン樹脂をコーティングした粒径７０
〜５０用（２５０〜３００メツシユ）のフェライト（最
大磁化６０ｅｍｕ／ｇ）を用い、非磁性トナーとしては
、スチレン／ブタジェン共重合体樹脂１００部にアゾ顔
料５部を加えた。平均粒径１０ルのものを用いた。A two-component developer was used as the developer, and as the magnetic carrier, a particle size of 70 mm coated with silicone resin was used.
50 (250 to 300 mesh) ferrite (maximum magnetization 60 emu/g) was used, and as a non-magnetic toner, 5 parts of an azo pigment was added to 100 parts of a styrene/butadiene copolymer resin. The particles with an average particle size of 10 l were used.
この現像剤（以下Ｔ１という）によって像担持体にトナ
ー像を形成し、転写材を通さずに、転写ローラに転写バ
イアス＋５００ｖを印加したところ、負帯電した現像剤
Ｔｌによって著しく汚れた。A toner image was formed on the image carrier using this developer (hereinafter referred to as T1), and when a transfer bias of +500 V was applied to the transfer roller without passing the transfer material, the negatively charged developer T1 caused significant staining.
そこで、この転写ローラに一５００Ｖのバイアスをかけ
て、現像剤が像担持体の方向へ向うような電界を形成し
たが、像担持体への転移は不充分であった。Therefore, a bias of 1,500 V was applied to this transfer roller to create an electric field that directed the developer toward the image carrier, but the transfer to the image carrier was insufficient.
つぎに、この現像剤Ｔ１に流動性付与剤として疎水性シ
リカを０．６％外添した現像剤（以下Ｔ２という）を用
いて、前記と同様の実験を行なったところ、現像剤Ｔ２
で汚染された転写ローラは、上記と同様の逆バイアスの
印加によって充分にクリーニングされることを確認した
。Next, an experiment similar to the above was conducted using a developer (hereinafter referred to as T2) in which 0.6% of hydrophobic silica was externally added as a fluidity imparting agent to the developer T1.
It was confirmed that the transfer roller contaminated with the above can be sufficiently cleaned by applying the same reverse bias as above.
第２図は上記の現像剤Ｔ１とＴ２を用いた場合の、転写
ローラに印加する逆バイアスと、転写ローラから像担持
体へ転移する各現像剤の転移率の関係を示すグラフであ
る。FIG. 2 is a graph showing the relationship between the reverse bias applied to the transfer roller and the transfer rate of each developer transferred from the transfer roller to the image carrier when the above-mentioned developers T1 and T2 are used.
上記転移率は、転写バイアスによって転写ローラに付着
した現像剤の重量と、該ローラに逆バイアスを印加して
５回転した後、このローラに残った現像剤の重量とを測
定し、クリーニングされた現像剤の量を算出して定めた
ものである。The above transfer rate was determined by measuring the weight of the developer attached to the transfer roller due to the transfer bias and the weight of the developer remaining on the roller after applying a reverse bias to the roller and rotating it 5 times. This is determined by calculating the amount of developer.
グラフ中１曲線Ｔ１は現像剤Ｔｌを用いた場合、曲線Ｔ
２は現像剤Ｔ２を用いた場合の結果を示すものとする。Curve T1 in the graph is curve T1 when developer Tl is used.
2 shows the results when developer T2 was used.
これから直ちに理解できるように、現像剤Ｔ２即ち、疎
水性シリカを外添した現像剤の場合には、−５００Ｖの
逆バイアスでおおむね完全にクリーニングが行なわれる
が、現像剤ＴＩの場合には、このバイアス値ではまった
くクリーニング不充分であった。As can be readily understood from this, in the case of developer T2, that is, the developer to which hydrophobic silica is externally added, cleaning is almost completely performed with a reverse bias of -500V, but in the case of developer TI, cleaning is almost completely performed. Cleaning was completely insufficient with the bias value.
このため、逆バイアスを順次あげていったところ、−２
０００Ｖでほぼクリーニングが行なわれることが判った
。Therefore, when the reverse bias was gradually increased, -2
It was found that almost all cleaning was performed at 000V.
しかしながら、このような状態が、バイアス印加手段の
構成からいって好ましくないことは勿論、像担持体の絶
縁破壊が生じたり、不必要に帯電したりするおそれがあ
って実用的とは云えないとすべきであろう。However, such a state is not only undesirable in view of the configuration of the bias applying means, but also impractical because there is a risk of dielectric breakdown of the image carrier or unnecessary charging. It should be done.
つぎに、現像剤としてｌ成分系絶縁性の磁性ネガトナー
を用いて実験を行なった。Next, an experiment was conducted using an l-component type insulating magnetic negative toner as a developer.
このトナーは、スチレンアクリルに、マグネタイトを６
０重量部、荷電制御剤を数％溶融混練したのち、粉砕、
分級した平均粒径１２％のトナー粉体としたもので、こ
れに疎水性シリカ０．６％を外添して現像剤として使用
した。This toner contains 6 magnetite in styrene acrylic.
After melting and kneading 0 parts by weight and several percent of the charge control agent, pulverization,
The toner powder was classified to have an average particle size of 12%, and 0.6% of hydrophobic silica was externally added thereto to be used as a developer.
この現像剤によって、前記の！ｌｔ置により、現像後、
転写剤を通さずに転写ローラに＋５００Ｖの転写バイア
スを印加して該ローラを汚染させたのち、これに−５０
０ｖの逆バイアスを印加したところ、転写ローラは充分
にクリーニングされることが確認された。With this developer, the above! After development,
After applying a transfer bias of +500V to the transfer roller without passing the transfer agent to contaminate the roller, apply a -50V transfer bias to the transfer roller.
When a reverse bias of 0 V was applied, it was confirmed that the transfer roller was sufficiently cleaned.
上記の現像剤から疎水性シリカを除いたものを現像剤と
して使用して同一の実験を行なったが、この場合にはト
ナーが転写ローラに強固に付着して逆バイアスの印加の
みでは転写ローラのクリーニングは実質的には不可能で
あった。The same experiment was conducted using the above developer with the hydrophobic silica removed, but in this case, the toner adhered firmly to the transfer roller and the transfer roller could not be easily applied by applying a reverse bias. Cleaning was virtually impossible.
以上のように、現像剤に、その流動性を増大させるよう
な物質を外添することによって良好な結果が得られるの
は、トナー粒子が個々に分散していて均一な帯電量を有
し、帯電量の低いものが少なく、その凝集にともなう凝
集粒子としての帯電量の低下も生じに＜〈、また、外添
剤がコロのような作用をして個々の粒子、ローラとの間
でのファンデルワールス力を減少させる傾向が生ずるな
どによるものと考えられる。As described above, good results can be obtained by externally adding a substance that increases the fluidity of the developer because the toner particles are individually dispersed and have a uniform charge amount. There are few particles with a low charge, and as they aggregate, the charge as agglomerated particles decreases.Also, the external additive acts like a roller, causing the individual particles to interact with the roller. This is thought to be due to a tendency to reduce van der Waals forces.
本発明の実施態様を示すとおおむね下記のごとくである
。The embodiments of the present invention are generally as follows.
■外添剤が疎水性シリカである特許請求の範囲記載の画
像形成装置。(2) The image forming apparatus according to the claims, wherein the external additive is hydrophobic silica.
（３）発明の詳細
な説明したように、転写ローラを用いて像担持体のトナ
ー像を転写材に転写するとともに、非転写時には転写時
とは反対極性のバイアスを印加するようにした画像形成
装置において、現像剤に流動性付与剤を外添することに
よって、低電位の逆バイアスで転写ローラを確実かつ充
分にクリーニングすることが可能であって、良質の画像
を常時安定して得るに資するところが大である。(3) As described in detail of the invention, image formation is performed in which a transfer roller is used to transfer a toner image on an image bearing member to a transfer material, and a bias of opposite polarity to that during transfer is applied during non-transfer. By externally adding a fluidity imparting agent to the developer in the device, it is possible to reliably and sufficiently clean the transfer roller with a low potential reverse bias, which contributes to consistently and consistently obtaining high-quality images. However, it is large.
第１図は本発明を適用するに適した画像形成装置の要部
の概略側面図、
第２図は本発明に使用する現像剤と、公知の現像剤とを
用いた場合の、転写ローラの被クリーニング特性を示す
グラフである。
ｌ・・・像担持体、２・令・転写ローラ、３・・命バイ
アス電源。Fig. 1 is a schematic side view of the main parts of an image forming apparatus suitable for applying the present invention, and Fig. 2 shows a transfer roller when the developer used in the present invention and a known developer are used. It is a graph showing characteristics to be cleaned. L...Image carrier, 2. Transfer roller, 3.. Bias power supply.
Claims (1)
者間を通過する転写材に、像担持体表面の静電潜像を顕
像化してなるトナー像を転写するとともに、非転写時に
はトナーを転写ローラから像担持体に転移させる方向の
電界を形成する画像形成装置において、 像担持体の静電潜像を顕像化してトナー像を形成するた
め、流動性付与剤を外添した現像剤を用いることを特徴
とする画像形成装置。[Scope of Claims] An image carrier includes an image carrier and a transfer roller that is in pressure contact with the image carrier, and a toner image formed by visualizing an electrostatic latent image on the surface of the image carrier is transferred to a transfer material passing between the two. At the same time, in an image forming device that forms an electric field in the direction of transferring toner from a transfer roller to an image bearing member when not being transferred, the electrostatic latent image on the image bearing member is visualized to form a toner image, so fluidity is imparted. An image forming apparatus characterized by using a developer to which a developer is externally added.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63018558A JPH01195459A (en) | 1988-01-30 | 1988-01-30 | Image forming device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63018558A JPH01195459A (en) | 1988-01-30 | 1988-01-30 | Image forming device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH01195459A true JPH01195459A (en) | 1989-08-07 |
Family
ID=11974953
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP63018558A Pending JPH01195459A (en) | 1988-01-30 | 1988-01-30 | Image forming device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH01195459A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5467174A (en) * | 1992-12-03 | 1995-11-14 | Seiko Epson Corporation | Apparatus for forming an image using an electrophotographic process |
| US6567625B1 (en) * | 1999-05-27 | 2003-05-20 | Matsushita Electric Industrial Co., Ltd. | Image forming apparatus and process cartridge with delayed rotation of photosensitive member |
-
1988
- 1988-01-30 JP JP63018558A patent/JPH01195459A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5467174A (en) * | 1992-12-03 | 1995-11-14 | Seiko Epson Corporation | Apparatus for forming an image using an electrophotographic process |
| US6567625B1 (en) * | 1999-05-27 | 2003-05-20 | Matsushita Electric Industrial Co., Ltd. | Image forming apparatus and process cartridge with delayed rotation of photosensitive member |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JP2733609B2 (en) | Transfer device | |
| US6442362B2 (en) | Image forming apparatus for making recovery and restoration of toners by electrical conductive member | |
| JPH01195459A (en) | Image forming device | |
| JP3760835B2 (en) | Image forming apparatus and control method | |
| JP2517206B2 (en) | Electrophotographic equipment | |
| JPH0337005Y2 (en) | ||
| JP2517202B2 (en) | Electrophotography method | |
| JP2517205B2 (en) | Electrophotographic equipment | |
| JP2000181289A (en) | Image forming apparatus | |
| JP3368208B2 (en) | Image forming device | |
| JP2516380Y2 (en) | Development device | |
| JPS6281674A (en) | Image forming device | |
| JP2517188B2 (en) | Electrophotographic method and apparatus | |
| JPH06258972A (en) | Image recorder | |
| JPS6348586A (en) | Formation of image | |
| JPS6194073A (en) | Image recorder | |
| JP2001290326A (en) | Image forming device | |
| JPS61193176A (en) | Image forming device | |
| JPH10111584A (en) | Image forming device | |
| JPH0345979A (en) | Cleaning device for image forming device | |
| JPS6326669A (en) | Developing method | |
| JPH05265302A (en) | Two-color image forming method | |
| JPH09185303A (en) | Image forming device | |
| JPH0310954B2 (en) | ||
| JP2002169384A (en) | Electrophotographic device, electrifying means provided therein and image recording method |