JPH01269968A - Image forming device - Google Patents
Image forming deviceInfo
- Publication number
- JPH01269968A JPH01269968A JP9819788A JP9819788A JPH01269968A JP H01269968 A JPH01269968 A JP H01269968A JP 9819788 A JP9819788 A JP 9819788A JP 9819788 A JP9819788 A JP 9819788A JP H01269968 A JPH01269968 A JP H01269968A
- Authority
- JP
- Japan
- Prior art keywords
- transfer
- image
- toner
- image forming
- photoreceptor
- 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.)
- Granted
Links
- 239000004020 conductor Substances 0.000 claims description 2
- 239000000463 material Substances 0.000 description 24
- 108091008695 photoreceptors Proteins 0.000 description 22
- 230000006866 deterioration Effects 0.000 description 4
- 238000001179 sorption measurement Methods 0.000 description 4
- 230000009471 action Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 230000005684 electric field Effects 0.000 description 2
- 230000002411 adverse Effects 0.000 description 1
- 239000003990 capacitor Substances 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000009499 grossing Methods 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
- 239000002023 wood Substances 0.000 description 1
Landscapes
- Electrostatic Charge, Transfer And Separation In Electrography (AREA)
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 that uses an electrostatic transfer process, such as an electrostatic copying machine and a printer thereof.
（従来技術と解決すべき課８）
像担持体表面に形成した可転写トナー像に、紙などシー
ト状の転写材を出接し、これに転写バイアスを印加して
前記トナー像を転写材に転写するように構成した画像形
成装置は従来から周知である。(Prior art and problem to be solved 8) A sheet-like transfer material such as paper is brought into contact with a transferable toner image formed on the surface of an image carrier, and a transfer bias is applied to this to transfer the toner image to the transfer material. Image forming apparatuses configured to do this are well known.
第４図はこのような装置の典型的な例を略示するもので
あって、不図示のホストコンピュータからの画像情報が
インターフェイスコトローラｌに入力されて信号処理苧
れ、その出力がレーザー駆動回路２によってレーザーダ
イオード３を画像に応動して発光させる。この出力光が
、コリメータ１７、ポリゴンミラー４．ｆθレンズ５９
反射鏡６を介して、予め一次帯電器７によって一様に帯
電された像担持体表面に投射されて静電潜像が形成され
る。FIG. 4 schematically shows a typical example of such a device, in which image information from a host computer (not shown) is input to an interface controller, which undergoes signal processing, and whose output is used to drive a laser. A circuit 2 causes a laser diode 3 to emit light in response to an image. This output light is transmitted to the collimator 17, polygon mirror 4. fθ lens 59
An electrostatic latent image is formed by projecting the light onto the surface of the image carrier, which has been uniformly charged in advance by the primary charger 7, through the reflecting mirror 6.
この潜像が、像担持体の回転にともなって現像器９の位
置に到達すると、これからトナーが供給されて、前記潜
像は顕像化されて転写帯電器１３をそなえた転写部位に
達する。When this latent image reaches the position of the developing device 9 as the image carrier rotates, toner is supplied therefrom, the latent image is visualized, and reaches a transfer site provided with a transfer charger 13.
一方カセット１１に収納されている転写材（不図示）が
、給紙コロ１０の作用でこれからとり取り出され、さら
にレジストローラ１２の作用で。On the other hand, a transfer material (not shown) stored in a cassette 11 is taken out by the action of paper feed rollers 10, and further by the action of registration rollers 12.
像担持体表面に形成されているトナー像とタイミングを
合せて前記転写部位に到来し、転写帯電器に印加される
転写バイアスの作用で、像担持体側のトナー像は転写材
に転移する。The toner image arrives at the transfer site in synchronization with the toner image formed on the surface of the image carrier, and is transferred to the transfer material by the action of the transfer bias applied to the transfer charger.
ついでこの転写材は感光体８から分離されて定着装置１
４に至って、ここでトナー像が転写材に定着固定されて
装置外に排出され、一方、転写部位において転写材に転
移せず像担持体に残る残留トナーはクリーニング装置１
５において像担持体から除去され、さらに像担持体表面
の残留電荷が前除電ランプなどによって除去されて次の
工程にそなえる状態になる。This transfer material is then separated from the photoreceptor 8 and transferred to the fixing device 1.
4, the toner image is fixed and fixed on the transfer material and discharged from the apparatus, while the residual toner that is not transferred to the transfer material at the transfer site and remains on the image carrier is removed by the cleaning device 1.
In step 5, the charge is removed from the image carrier, and the residual charge on the surface of the image carrier is further removed by a pre-discharging lamp or the like, so that it is ready for the next step.
第４図はこのような装置におけるとくに前記転写部位近
傍の構成を拡大して示したものであって、前記装置と対
応する部分には同一の符号を付して示しである。FIG. 4 is an enlarged view of the structure of such an apparatus, especially in the vicinity of the transfer site, and parts corresponding to those of the apparatus are designated by the same reference numerals.
図示の場合、プラス帯電した潜像部分にマイナス（ｆＦ
１１Ｆ、 ）ナーＴが付着してトナー像を形成してい
る正規現像の態様を示しており、この場合、転写帯電器
１３にはプラス極性のバイアスが印加されて転写材には
プラスの電荷が付与されるので、これによるトナーに対
する吸引力を、感光体のトナー吸着力よりも大きく、シ
ておくことによって、感光体側のトナーを転写材に転移
させることができる。In the case shown, a negative (fF
11F, ) shows a normal development mode in which toner T adheres to form a toner image; in this case, a positive polarity bias is applied to the transfer charger 13 and a positive charge is applied to the transfer material. Therefore, by making the suction force for the toner larger than the toner adsorption force of the photoreceptor, the toner on the photoreceptor side can be transferred to the transfer material.
ところで、上記のような力関係を、環境条件や転写材の
特性の差異などにかかわらず、常時確実に維持するため
には、転写バイアスを通常予測されるような使用条件下
で必要とされるよりはるかに大きく設定しておかなけれ
ばならない。By the way, in order to reliably maintain the above-mentioned force relationship at all times, regardless of environmental conditions or differences in the characteristics of transfer materials, transfer bias is required under normally expected usage conditions. It must be set much larger than that.
しかじながら、このようにすると、転写部位に形成され
る強電界によって、転写材が感光体に接触する正規の転
写位置に到達する以前にこれに付与された背面電荷によ
って１．感光体表面のトナーが転写材との間隙を越えて
転写材に飛んで画像回りにトナーの飛び触りを生じて画
質の劣化を招来する。However, in this case, due to the strong electric field formed at the transfer site, 1. The toner on the surface of the photoreceptor crosses the gap between the photoreceptor and the transfer material and flies onto the transfer material, causing toner flying around the image, resulting in deterioration of image quality.
転写帯電器の開口部分を絞ることによって、このような
事態の発生はある程度防止できるが、近来のこの種のｉ
！ｉ像形成装置の小型化傾向によって、感光体も小径化
がすすんできており、帯電器の開口部を絞ると電荷が不
足して転写不良を生ずるの根本的な解決にはならない。This kind of situation can be prevented to some extent by narrowing down the aperture of the transfer charger, but this type of i
! With the trend toward miniaturization of image forming apparatuses, photoreceptors are also becoming smaller in diameter, and narrowing the aperture of the charger does not fundamentally solve the problem of insufficient charge and poor transfer.
また、転写材の後端が、最終ガイドとしての作用をもし
ているレジストローラを通過したあとは、転写材の感光
体への静電吸着作用が転写材の搬送に寄与しているわけ
であるが、感光体の小径化にともなって、すなわち曲率
が大きくなるにともなって吸着域が小さくなり、同時に
、吸着して彎曲した転写材の反発作用も大きくなるので
、腰の強い転写材に場合には感光体と転写材の同期が得
にくくなりこれが画質の劣化を招来する。Furthermore, after the trailing edge of the transfer material passes through the registration rollers, which also act as a final guide, the electrostatic attraction of the transfer material to the photoreceptor contributes to the conveyance of the transfer material. However, as the diameter of the photoconductor becomes smaller, that is, as the curvature increases, the adsorption area becomes smaller, and at the same time, the repulsive effect of the adsorbed and curved transfer material increases, so it may be difficult to use a stiff transfer material. In this case, it becomes difficult to obtain synchronization between the photoreceptor and the transfer material, resulting in deterioration of image quality.
さらに、帯電器によって転写部位にある転写材に充分な
電荷を付与するには、通常３〜５ｋＶの高圧を印加する
必要があるので、このための電源コストもそれだけ高く
なるので、とくに小型の、汎用を目途とするような装置
には適当ではない。Furthermore, in order to apply a sufficient charge to the transfer material at the transfer site using a charger, it is usually necessary to apply a high voltage of 3 to 5 kV, which increases the power supply cost accordingly, so it is especially important for small-sized devices. It is not suitable for devices intended for general use.
本発明はこのような木態に対処すべくなされたものであ
って、転写ローラを利用する画像形成装置において、該
転写ローラの曲率を限定することによって１画像回りの
トナーの飛び散り、像担持体への吸着力不足になどによ
る画質の劣化がなく、転写バイアスにもとく高圧を必要
としない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 to deal with such wood conditions, and in an image forming apparatus using a transfer roller, by limiting the curvature of the transfer roller, toner scattering around one image and image bearing member are prevented. It is an object of the present invention to provide an image forming apparatus that does not cause deterioration in image quality due to insufficient adsorption force to the image forming apparatus, and does not require high pressure for transfer bias.
（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、これに圧接し、少
なくとも表面が導電性材料で形成されている弾性転写ロ
ーラとをそなえた画像形成装置において、前記像担持体
の曲率を１／ ３０ ｍｍ以下に形成ししたことを特徴
とするものである。(2) Structure of the invention (technical means for solving the problem, its effect) In order to achieve the above object, the present invention includes an image carrier, an image carrier that is in pressure contact with the image carrier, and at least the surface of which is formed of a conductive material. An image forming apparatus equipped with an elastic transfer roller is characterized in that the image carrier has a curvature of 1/30 mm or less.
このように構成することによって、転写部位近傍におけ
る画像まわりのトナーの飛び散りを阻止円筒状の感光体
８をそなえた画像形成装置の、とくに転写部位近傍を示
す要部側面図である。This configuration prevents toner from scattering around the image in the vicinity of the transfer site. FIG. 2 is a side view of a main part of an image forming apparatus equipped with a cylindrical photoreceptor 8, particularly showing the vicinity of the transfer site.
一
紙面に垂直方向にのびている軸線を有する円筒状の感光
体８が、矢印Ｘ方向に回転するものとし、これに、比抵
抗がｔＯＳ〜ｌＯｖΩｃｍに調整された弾性部材からな
る転写ローラ１８が圧接している。A cylindrical photoreceptor 8 having an axis extending perpendicularly to the plane of the paper is assumed to rotate in the direction of arrow X, and a transfer roller 18 made of an elastic member whose resistivity is adjusted to tOS to lOvΩcm is pressed into contact with the photoreceptor 8. are doing.
感光体８表面にトナー像を形成する仕方は、この装置に
おいては、反転現像によって画像形成を行なっているの
で、感光体表面がマイナス極性に帯電されて、これにマ
イナス帯電したトナーが付着してトナー像を形成するよ
うになっているほかは、基本的に前記第４図々示の装置
の場合と同様である。In this apparatus, the toner image is formed on the surface of the photoreceptor 8 by reverse development, so the surface of the photoreceptor is negatively charged and the negatively charged toner adheres to it. The apparatus is basically the same as the apparatus shown in FIG. 4 above, except that a toner image is formed.
転写にさいしては、転写ローラ１８には、その芯金１８
ａを介り、て＋５００〜１００ＯＶ程度の電圧を印加す
ることによって所期の転写機能を得ることができる。During transfer, the transfer roller 18 has its core metal 18.
The desired transfer function can be obtained by applying a voltage of approximately +500 to 100 OV via the terminal a.
このように構成しであるから、前述のような転写帯電器
を利用するようなものに比して、点イアスが上記のよう
に低くてすむので、転写にあたって転写材に付与される
電荷も最小限に抑えられ、画像まわりのトナーの飛び散
りは生ぜず、前記公知のものに比べて１１５〜１／１０
の印加電圧で間に合う。With this configuration, the point IA is lower than that using the transfer charger as described above, and the charge applied to the transfer material during transfer is also minimized. The toner scattering around the image is suppressed to a minimum, and the toner scattering around the image does not occur.
An applied voltage of
また、転写領域が感光体と転写ローラのニップ部に限定
されていて、この範囲が元来狭いので、感光体の直径に
よって、搬送性に差異が生じ、これに起因して画像劣化
が発生するようなこともない。Furthermore, since the transfer area is limited to the nip between the photoreceptor and the transfer roller, and this area is inherently narrow, there is a difference in conveyance depending on the diameter of the photoreceptor, which causes image deterioration. There is no such thing.
下の表は、第１図々示ののような転写機構をそなえた画
像形成装置において、転写バイアスとして＋５００ｖを
印加し、転写ローラ１８の直径１０重量のものを使用し
、感光体の径を変化させていった場合の、トナーの画像
まわりへの飛び散り、転写ずれの発生の状態を示すもの
である。The table below shows that in an image forming apparatus equipped with a transfer mechanism as shown in the first figure, +500V is applied as a transfer bias, a transfer roller 18 with a diameter of 10 weight is used, and the diameter of a photoreceptor is This shows the state of toner scattering around the image and transfer misalignment when the image is changed.
表中、○は良好、Δは一部劣悪環境下では不良を示すが
、通常環境では良好、×は通常環境でも不良を示す。In the table, ◯ indicates good performance, Δ indicates poor performance under some adverse environments, but good under normal environment, and × indicates poor performance even under normal environment.
表中、分離性は、転写材の自重だけで分離するか否かの
判断である。In the table, separability is a judgment as to whether or not the transfer material separates only by its own weight.
この表から、感光体の曲率が１／３０層層より大きイト
ころで、ローラ転写とコロナ転写との間にはっきりした
差異が生ずることが判る。From this table, it can be seen that a clear difference occurs between roller transfer and corona transfer when the curvature of the photoreceptor is larger than 1/30 layer.
なお、前記実施例においては、反転現像の場合について
述べたが、正規現像の場合においても、転写バイアスを
若干高くするための問題はあるが、上記の表に示された
ような、感光体の曲率の変化による利点は基本的に維持
されることが確認されている。In the above embodiments, the case of reversal development was described, but even in the case of normal development, there is a problem of slightly increasing the transfer bias, but as shown in the table above, It has been confirmed that the advantages of changing the curvature are essentially maintained.
第２図は本発明の他の実施例を示すもので、このものは
、転写バイアスとして、交流電源２ｏによる交流バイア
スを印加するように構成しである。このため、転写材の
卑画像領域裏面の電荷は除電され、トナーの付着した部
分にのみ背面電荷が存在するので、背面電荷に起因する
画像の乱に対しては前記実施例よりも有利である。FIG. 2 shows another embodiment of the present invention, which is configured to apply an alternating current bias from an alternating current power source 2o as a transfer bias. Therefore, the charge on the back surface of the base image area of the transfer material is eliminated, and the back surface charge exists only in the area to which the toner is attached, which is more advantageous than the previous embodiment in terms of image disturbance caused by the back surface charge. .
また、反転現像の場合には、感光体とトナーとの間の吸
引作用が存在しないので、トナーは、感光体の非画像部
の電荷と、これによって転写ローラに誘起される電荷に
よる電界によって転写が行なわれ、該ローラにバイアス
を印加する要がないので有利である。In addition, in the case of reversal development, there is no attraction between the photoreceptor and the toner, so the toner is transferred by the electric field caused by the charge on the non-image area of the photoreceptor and the charge induced on the transfer roller. This is advantageous because there is no need to apply a bias to the roller.
第３図は、上記の装置における、バイアス電源２０と、
現像器における現像バイアスを一体とした例を示すもの
である。FIG. 3 shows the bias power supply 20 in the above device,
This is an example in which the developing bias in the developing device is integrated.
ＴＩ 、Ｔ２はいずれもを２次側巻線で、１１部で交流
電圧を、Ｔ２部で直流電圧を発生し、それらを重畳して
出力Ａ、Ｂを得る０図中、へ、ＤＢはダイオード、５、
Ｃ８は平滑コンデンサーである。Both TI and T2 are secondary windings, part 11 generates AC voltage, and part T2 generates DC voltage, and these are superimposed to obtain outputs A and B. In the figure, to and DB are diodes. ,5,
C8 is a smoothing capacitor.
出力Ａは現像バイアスとして、また、出力Ｂは第２図に
おける交流電源２０に用いる。The output A is used as a developing bias, and the output B is used for the AC power supply 20 in FIG.
このように構成することによって転写バイアス用の電源
を別設する必要がないのでコスト上有利である。With this configuration, there is no need to separately provide a power source for transfer bias, which is advantageous in terms of cost.
具体例について略述すると、感光体表面の暗電位を一７
ｏｏｖ、明電位を一１５０Ｖとした場合、ピーク間電圧
１６００Ｖ、１２００Ｈ２（７）交流に直流−５００ｖ
ｔｌ−重畳してこれを出力Ａとし、ピーク間電圧１６０
０Ｖ、１２００Ｈｚｃ７）交流に直流＋５００■を重畳
したものを出力Ｂとして転写ローラ１８に印加したとこ
ろ、画像まわりにトナ・−の飛び散りのない安定した転
写を実現することができた。To briefly describe a specific example, the dark potential of the photoreceptor surface is
oov, when the bright potential is -150V, the peak-to-peak voltage is 1600V, 1200H2 (7) AC to DC -500V
tl-superimposed, this is output A, and the peak-to-peak voltage is 160
0V, 1200Hzc7) When a DC current +500cm superimposed on an AC current was applied as output B to the transfer roller 18, stable transfer without toner scattering around the image could be achieved.
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.
■ 感光体上の電荷と現像剤のそれとが同極性である特
許請求の範囲記載の画像形成装置。(2) An image forming apparatus according to the claims, wherein the charge on the photoreceptor and that of the developer have the same polarity.
■ 転写ローラに印加するバイアスが現像剤の電荷の極
性と反対極性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 bias applied to the transfer roller has a polarity opposite to the polarity of the charge of the developer.
■ 転写ローラに印加する転写バイアスが電圧である特
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 transfer bias applied to the transfer roller is a voltage.
（３）発明の詳細
な説明したように、本発明によるときは、転写部位近傍
におけるトナーの飛び散り、感光体への転写材の吸着作
用の不足による転写ずれなどを解消することができ、特
段の高圧電源を必要としないので、コストダウンが可能
であり、とくに小型の画像形成装置に適用するのに好適
である。(3) As described in detail of the invention, according to the present invention, it is possible to eliminate toner scattering near the transfer site and transfer misalignment due to insufficient adsorption of the transfer material to the photoconductor. Since no high-voltage power source is required, costs can be reduced, and it is particularly suitable for application to small-sized image forming apparatuses.
第１図は本発明を適用した画材形成装置の要部側面図。
第２図は他の実施例を示す要部側面図、第３図はバイア
ス電源の一例を示す回路図。
第４図は公知の画像形成装置の構成を示す概略側面図、
第５図は同上転写部位の構成を示す拡大側面図である。
８００．感光体、１８１１０．転写ローラ、１９．２０
−＃−バイアス電源。FIG. 1 is a side view of essential parts of an art material forming apparatus to which the present invention is applied. FIG. 2 is a side view of main parts showing another embodiment, and FIG. 3 is a circuit diagram showing an example of a bias power supply. FIG. 4 is a schematic side view showing the configuration of a known image forming apparatus, and FIG. 5 is an enlarged side view showing the configuration of the same transfer site. 800. Photoreceptor, 18110. Transfer roller, 19.20
-#- Bias power supply.
Claims (1)
料で形成されている弾性転写ローラとをそなえた画像形
成装置において、 前記像担持体の曲率を１／３０ｍｍ以下に形成してなる
画像形成装置。[Scope of Claims] An image forming apparatus comprising an image carrier and an elastic transfer roller in pressure contact with the image carrier and having at least a surface formed of a conductive material, wherein the image carrier has a curvature of 1/30 mm or less. An image forming apparatus formed by forming an image.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63098197A JP2694445B2 (en) | 1988-04-22 | 1988-04-22 | Image forming device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63098197A JP2694445B2 (en) | 1988-04-22 | 1988-04-22 | Image forming device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH01269968A true JPH01269968A (en) | 1989-10-27 |
| JP2694445B2 JP2694445B2 (en) | 1997-12-24 |
Family
ID=14213277
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP63098197A Expired - Lifetime JP2694445B2 (en) | 1988-04-22 | 1988-04-22 | Image forming device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2694445B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2013029798A (en) * | 2011-06-22 | 2013-02-07 | Ricoh Co Ltd | Image forming device |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS56113175A (en) * | 1980-02-14 | 1981-09-05 | Toshiba Corp | Electronic copying machine |
| JPS58198060A (en) * | 1982-05-14 | 1983-11-17 | Hitachi Ltd | Recording device |
| JPS59126571A (en) * | 1983-01-10 | 1984-07-21 | Canon Inc | Transfer type image forming device |
| JPS60150071A (en) * | 1984-01-17 | 1985-08-07 | Showa Electric Wire & Cable Co Ltd | Transfer roller |
| JPS60165232A (en) * | 1984-02-08 | 1985-08-28 | Showa Electric Wire & Cable Co Ltd | Manufacture of transfer roller |
| JPS6275471A (en) * | 1985-09-30 | 1987-04-07 | Canon Inc | Electrophotographing process |
-
1988
- 1988-04-22 JP JP63098197A patent/JP2694445B2/en not_active Expired - Lifetime
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS56113175A (en) * | 1980-02-14 | 1981-09-05 | Toshiba Corp | Electronic copying machine |
| JPS58198060A (en) * | 1982-05-14 | 1983-11-17 | Hitachi Ltd | Recording device |
| JPS59126571A (en) * | 1983-01-10 | 1984-07-21 | Canon Inc | Transfer type image forming device |
| JPS60150071A (en) * | 1984-01-17 | 1985-08-07 | Showa Electric Wire & Cable Co Ltd | Transfer roller |
| JPS60165232A (en) * | 1984-02-08 | 1985-08-28 | Showa Electric Wire & Cable Co Ltd | Manufacture of transfer roller |
| JPS6275471A (en) * | 1985-09-30 | 1987-04-07 | Canon Inc | Electrophotographing process |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2013029798A (en) * | 2011-06-22 | 2013-02-07 | Ricoh Co Ltd | Image forming device |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2694445B2 (en) | 1997-12-24 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JPH02300774A (en) | Image forming device | |
| JP3110539B2 (en) | Image forming device | |
| JP2614309B2 (en) | Image forming device | |
| JP2665290B2 (en) | Separation device | |
| JP2629815B2 (en) | Image forming device | |
| JPH01269968A (en) | Image forming device | |
| US11435675B2 (en) | Image forming apparatus with fog suppression feature | |
| JP3363807B2 (en) | Transfer device | |
| JP3096325B2 (en) | Electrophotographic equipment | |
| JP3449118B2 (en) | Image forming device | |
| JP2000098705A (en) | Developing device | |
| JPH0980871A (en) | Image forming device | |
| JP2001305878A (en) | Image forming apparatus | |
| JPH07248705A (en) | Image forming device | |
| JP3021105B2 (en) | Image forming device | |
| JPS63316074A (en) | Transfer material separating device | |
| JPH10282798A (en) | Image forming device | |
| JPH0333776A (en) | Developing device | |
| JPH01269969A (en) | Image forming device | |
| US7023583B2 (en) | Method and apparatus for use in image forming apparatus | |
| KR970049120A (en) | Method for cleaning contact charging means of device using electrophotographic development method | |
| JP3319135B2 (en) | Electrophotographic equipment | |
| JP3548198B2 (en) | Image forming device | |
| JP3021106B2 (en) | Image forming device | |
| JPH0792767A (en) | Image forming device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20070912 Year of fee payment: 10 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20080912 Year of fee payment: 11 |
|
| EXPY | Cancellation because of completion of term | ||
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20080912 Year of fee payment: 11 |