JP2801230B2 - Image forming device - Google Patents
Image forming deviceInfo
- Publication number
- JP2801230B2 JP2801230B2 JP63332640A JP33264088A JP2801230B2 JP 2801230 B2 JP2801230 B2 JP 2801230B2 JP 63332640 A JP63332640 A JP 63332640A JP 33264088 A JP33264088 A JP 33264088A JP 2801230 B2 JP2801230 B2 JP 2801230B2
- Authority
- JP
- Japan
- Prior art keywords
- image
- image carrier
- transfer
- transfer roller
- toner
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
Description
【発明の詳細な説明】 ［産業上の利用分野］ 本発明は、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。Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image forming apparatus using an electrostatic transfer process, such as an electrostatic copying machine and the same printer.
［背景技術］ 従来、回転円筒状の構成を主とする像担持体に転写ロ
ーラを圧接し、これら両者間に紙を主とするシート状の
転写材ぽ通過させて、像担持体表面に形成したトナー像
を転写バイアスの作成によって、転写紙に転写する構成
の画像形成装置は従来からよく知られている。しかしな
がら、転写電界により像転写前に像担持体上のトナー像
が乱れて転写し、転写材上のトナー像が飛び散ったよう
な画像となることがあった。[Background Art] Conventionally, a transfer roller is pressed against an image carrier mainly composed of a rotating cylinder, and a sheet-shaped transfer material mainly composed of paper is passed between the two to form the image on the surface of the image carrier. 2. Description of the Related Art An image forming apparatus configured to transfer a formed toner image onto transfer paper by creating a transfer bias has been well known. However, the toner image on the image carrier may be disturbed and transferred before the image transfer by the transfer electric field, and the toner image on the transfer material may be scattered.
一方、近年、複写機のみならず、コンピユーターの普
及によって、像担持体たる感光体に光を照射する光源に
レーザーあるいはLEDや液晶シヤツター等を搭載した電
子写真方式によるプリンタがひろく汎用されるようにな
ってきている。このような装置においては画質の面から
現像して像となる部分を露光するのが一般的であって、
その顕像化には反転現像方式がよく利用されている。し
かしながら、反転現像方式では、トナーの帯電極性とト
ナーを保持する感光体の電位が逆極性成分をもたないの
で感光体がトナーを保持する力が弱く前述説明のような
装置では、より多くのトナーの乱れが生じることが解っ
た。On the other hand, in recent years, with the spread of computers as well as copiers, electrophotographic printers equipped with lasers, LEDs, liquid crystal shutters, etc. as light sources for irradiating light to photoconductors as image carriers have become widely used. It has become to. In such an apparatus, it is common to expose a portion that becomes an image by developing from the aspect of image quality,
The reversal development method is often used for visualization. However, in the reversal developing method, since the charging polarity of the toner and the potential of the photoconductor holding the toner do not have a reverse polarity component, the power of the photoconductor holding the toner is weak, and in the apparatus described above, more It has been found that toner disturbance occurs.
［発明の目的］ 本発明は、上記の点に鑑み成されたものであり、良好
な画像を得ると共に小型の画像形成装置を提供すること
を目的とする。[Object of the Invention] The present invention has been made in view of the above points, and has as its object to provide a small-sized image forming apparatus while obtaining good images.
［発明の構成］ 本発明は、トナー像を担持する像担持体と、前記像担
持体とニップ部を形成する転写ローラであって、前記ニ
ップ部で前記像担持体から転写材へトナー像を転写し、
前記トナー像の帯電極性と逆極性の電圧が印加される転
写ローラと、を有する画像形成装置において、転写材の
先端が前記像担持体に接触し始める点において、前記像
担持体の回転中心と前記転写ローラの回転中心を結んだ
直線方向における前記像担持体と前記転写ローラとの距
離をＤ（mm）、前記電圧をＥ（KV）とするとＤ＞1.5Eが
成り立つことを特徴とするものである。[Constitution of the Invention] The present invention relates to an image carrier that carries a toner image, and a transfer roller that forms a nip portion with the image carrier, wherein the nip portion transfers a toner image from the image carrier to a transfer material. Transcribe,
A transfer roller to which a voltage having a polarity opposite to the charging polarity of the toner image is applied.In an image forming apparatus, at the point where the leading end of a transfer material starts to contact the image carrier, the rotation center of the image carrier is When the distance between the image carrier and the transfer roller in a linear direction connecting the rotation center of the transfer roller is D (mm) and the voltage is E (KV), D> 1.5E is satisfied. It is.
［実施例］ 以下、本発明の実施例について図面に基づいて具体的
に説明する。第１図は本発明の画像形成装置の一実施例
である。レーザビームプリンタを示す。直径30mmのアル
ミニウムシリンダー１上面に有機半導電体（OPC）、酸
化亜鉛、セレン、アモルフアスシリコンのような感光層
２を塗布又は蒸着等の手段で固着したものを像担持体３
とし、本装置ではOPCを塗布している。像担持体３は矢
印方向Ａに周速度毎秒44mmで駆動回転させ、帯電器４に
より像担持体３上に均一に−600Vに帯電する。次に画像
情報に従った信号をレーザーダイオード５に与えること
によって画像光Ｌを高速モーター６によって回転する多
面鏡７に反射させ、反射光を像担持体３の感光層２に照
射する。これにより像担持体３上には静電潜像が形成さ
れる。この時光照射された像担持体３の感光層２には−
60Vになる様な光エネルギーが与えられる。次の現像工
程８にて光照射された位置に負に帯電された顕像剤（以
下トナーと呼ぶ）が付着する様に現像器８に像担持体帯
電極性と同じで略同電位の電圧例えば−500Vを印加して
現像する。この電圧には交流電圧を重畳してもよい。像
担持体３上のトナー画像には本発明に従った転写ローラ
９によって転写材たる転写紙10に転写される。EXAMPLES Hereinafter, examples of the present invention will be specifically described with reference to the drawings. FIG. 1 shows an embodiment of the image forming apparatus of the present invention. 1 shows a laser beam printer. An image bearing member 3 in which a photosensitive layer 2 such as an organic semiconductor (OPC), zinc oxide, selenium, and amorphous silicon is fixed on the upper surface of an aluminum cylinder 1 having a diameter of 30 mm by coating or vapor deposition.
In this device, OPC is applied. The image carrier 3 is driven and rotated in the direction of the arrow A at a peripheral speed of 44 mm per second, and is uniformly charged to -600 V on the image carrier 3 by the charger 4. Next, a signal according to the image information is given to the laser diode 5 so that the image light L is reflected by the rotating polygon mirror 7 by the high-speed motor 6, and the reflected light is applied to the photosensitive layer 2 of the image carrier 3. As a result, an electrostatic latent image is formed on the image carrier 3. At this time, the photosensitive layer 2 of the image carrier 3 irradiated with light
Light energy such as 60V is given. A voltage having substantially the same potential as the charge polarity of the image carrier in the developing device 8 such that a negatively charged developer (hereinafter referred to as toner) adheres to the position irradiated with light in the next developing step 8. Develop by applying -500V. An AC voltage may be superimposed on this voltage. The toner image on the image carrier 3 is transferred by a transfer roller 9 according to the present invention to a transfer sheet 10 as a transfer material.
以下、転写装置について更に詳しく説明する。 Hereinafter, the transfer device will be described in more detail.
転写ローラ９は107Ωcm〜1013Ωcmの体積抵抗率、好
ましくは５×107Ωcm〜109Ωcmの体積抵抗率の抵抗体12
を直径12mmの金属棒11に外径が16mmになる様塗布した。
この抵抗体12はゴム材を巻き付ける，例えばゴム内にカ
ーボン酸化亜鉛等を混合し抵抗調整したものが良い。こ
こで、転写ローラ９の周速は像担持体３と同じ速度で駆
動させる。The transfer roller 9 is a resistor 12 having a volume resistivity of 10 7 Ωcm to 10 13 Ωcm, preferably a volume resistivity of 5 × 10 7 Ωcm to 10 9 Ωcm.
Was applied to a metal rod 11 having a diameter of 12 mm so that the outer diameter became 16 mm.
The resistor 12 is preferably formed by winding a rubber material, for example, by mixing carbon zinc oxide or the like in rubber and adjusting the resistance. Here, the peripheral speed of the transfer roller 9 is driven at the same speed as that of the image carrier 3.
転写紙10は給紙ローラ13により紙ガイド14を経て、転
写ローラ９と像担持体３間へ搬送されるが、この場合転
写紙10は紙ガイド14により先ず像担持体３へ向けられ
る。ついで転写紙10の先端部は第１図に示すように、上
記像担持体３面に密接し、像担持体３の回転につれて転
写紙10は転写ローラ９と像担持体３との圧力面に押圧さ
れ、像担持体３のトナー像は転写紙10に転写される。The transfer paper 10 is conveyed between the transfer roller 9 and the image carrier 3 through the paper guide 14 by the paper feed roller 13. In this case, the transfer paper 10 is first directed to the image carrier 3 by the paper guide 14. Then, as shown in FIG. 1, the leading end of the transfer paper 10 is in close contact with the surface of the image carrier 3, and as the image carrier 3 rotates, the transfer paper 10 comes into contact with the pressure surface between the transfer roller 9 and the image carrier 3. When pressed, the toner image on the image carrier 3 is transferred to the transfer paper 10.
この場合、転写ローラ９には転写紙10のない状態でか
つ像担持体３の表面電位が−600Vの時転写ローラと像担
持体との間の通電電流が3.5μＡ（像担持体の長手方向
の像担持体と転写ローラとの当接幅210mm）になる様に
転写ローラ９に印加する電圧を2.8KVに設定しこの時に
転写機10として坪量64gr/m2の複写用紙（大日本製紙か
ら発売）を使用したところ転写ローラと像担持体との間
で約1.0μＡ〜1.5μＡの電流が流れた。これは紙の種類
によっても変るものである。In this case, when the transfer roller 9 has no transfer paper 10 and the surface potential of the image carrier 3 is -600 V, the current flowing between the transfer roller and the image carrier is 3.5 μA (in the longitudinal direction of the image carrier). The voltage applied to the transfer roller 9 is set to 2.8 KV so that the contact width between the image bearing member and the transfer roller is 210 mm. At this time, the transfer machine 10 is used as a copy paper having a basis weight of 64 gr / m 2 (Dai Nippon Was used, a current of about 1.0 μA to 1.5 μA flowed between the transfer roller and the image carrier. This varies depending on the type of paper.
この転写紙10のある状態での電流I1と転写紙10のない
状態での電流I2との比I1/I2が（1.5/3.5＝0.42）となる
が、この比が0.3以上になる様に転写ローラ89の抵抗値
を選べば転写紙10がない状態でも、像担持体３へ異常な
電荷注入が行なわれず、次の記録工程で電位ムラ等を発
生することがなかった。The ratio I 1 / I 2 of the current I 1 with the transfer paper 10 to the current I 2 without the transfer paper 10 is (1.5 / 3.5 = 0.42). If the resistance value of the transfer roller 89 is selected in such a manner, abnormal charge injection into the image carrier 3 is not performed even when the transfer paper 10 is not present, and potential unevenness or the like does not occur in the next recording step.
又、転写紙10上の未定着トナー像は定着器14によって
加熱加圧され定着される。一方、転写後像担持体３上に
残余したトナーはブレード等のクリーニング装置15によ
って清掃される。The unfixed toner image on the transfer paper 10 is heated and pressed by the fixing device 14 and fixed. On the other hand, the toner remaining on the post-transfer image carrier 3 is cleaned by a cleaning device 15 such as a blade.
第２図は第１図の転写位置の拡大図である。 FIG. 2 is an enlarged view of the transfer position in FIG.
第２図（Ａ）は、従来の転写紙10が直接像担持体３と
転写ローラ９に直接挿入する状態を示し、第２図（Ｂ）
は転写紙10が像担持体３に接触してから、像担持体３と
転写ローラ９に挿入される様子を示す。FIG. 2A shows a state in which the conventional transfer paper 10 is directly inserted into the image carrier 3 and the transfer roller 9, and FIG.
Shows a state in which the transfer paper 10 comes into contact with the image carrier 3 and is then inserted into the image carrier 3 and the transfer roller 9.
第２図（Ａ）において、従来転写ローラ９の抵抗体12
の体積抵抗が十分低い場合（103Ωcm〜106Ωcm）におい
ては転写ローラ９への印加電圧は低く（約500V〜1000
V）転写ローラー９からの電界は像担持体３上面のトナ
ーへ作用することが少ない。しかしながら本装置の様に
ローラ９の抵抗体12が体積固有抵抗107Ωcm〜1010Ωcm
の場合に於ては、転写ローラ９への印加電圧が2000V〜4
000Vを与えなければならず、像担持体３上面のトナーＴ
へ電界の作用が影響し、転写紙10と像担持体３が重なる
以前にトナーＴは破線Ｔ′の様に移動があるために転写
紙10上へは像担持体３上のトナー像は乱れて転写し、転
写紙10上の画像はトナーが飛び散ったような画像とな
る。In FIG. 2A, the resistor 12 of the conventional transfer roller 9 is
When the volume resistance of the transfer roller 9 is sufficiently low (10 3 Ωcm to 10 6 Ωcm), the voltage applied to the transfer roller 9 is low (about 500 V to 1000 V).
V) The electric field from the transfer roller 9 hardly acts on the toner on the upper surface of the image carrier 3. However, as in this apparatus, the resistor 12 of the roller 9 has a volume resistivity of 10 7 Ωcm to 10 10 Ωcm.
In the case of (2), the voltage applied to the transfer roller 9 is 2000 V to 4
000 V, and the toner T on the upper surface of the image carrier 3
The toner T moves as indicated by a broken line T 'before the transfer paper 10 and the image carrier 3 overlap, and the toner image on the image carrier 3 is disturbed on the transfer paper 10. The image on the transfer paper 10 is an image as if the toner scattered.
第２図（Ｂ）は第１図説明の如く、あらかじめ像担持
体３と転写紙10を重ね合せた後に像担持体３と転写ロー
ラ９間に挿入することによって転写ローラ９に高電圧
（2KV〜4KV）を印加しても第２図（Ａ）のようなトナー
画像の乱れはない。又転写紙10上へ転写されたトナーは
転写ローラ９から発生する高電界によりトナーの乱れを
生じさせない。FIG. 2 (B) shows a high voltage (2 KV) applied to the transfer roller 9 by overlapping the image carrier 3 and the transfer paper 10 in advance and then inserting it between the image carrier 3 and the transfer roller 9 as shown in FIG. 2 to 4 KV), there is no disturbance of the toner image as shown in FIG. Further, the toner transferred onto the transfer paper 10 does not cause disturbance of the toner due to the high electric field generated from the transfer roller 9.
第３図は転写紙の先端が像担持体に接触し始める点に
おける像担持体表面と転写ローラ表面との距離Ｄ［mm］
と、転写ローラへの印加電圧Ｅ［KV］との関係を示すグ
ラフである。像担持体表面と転写ローラ表面との距離と
は、像担持体と転写ローラの回転中心を結んだ直線方向
の距離で第１図に示されている。ここで、斜線部は、転
写において、像担持体上のトナー像を乱す場合であり、
Ｄ≦1.5Eという関係がある。即ち、転写時にトナー像を
乱さないようにするには、像担持体と転写ローラとの距
離がＤ＝1.5Eになる以前に像担持体と転写紙の先端が接
触し始めれば良い。このときＤ＞1.5Eという関係が成り
立つ。FIG. 3 shows the distance D [mm] between the surface of the image carrier and the surface of the transfer roller at the point where the leading edge of the transfer paper starts to contact the image carrier.
6 is a graph showing the relationship between the transfer voltage and a voltage E [KV] applied to a transfer roller. The distance between the surface of the image carrier and the surface of the transfer roller is shown in FIG. 1 as a distance in a linear direction connecting the rotation center of the image carrier and the transfer roller. Here, the hatched portion indicates a case where the toner image on the image carrier is disturbed during transfer.
There is a relationship of D ≦ 1.5E. That is, in order to prevent the toner image from being disturbed at the time of transfer, the image carrier and the leading end of the transfer paper may start to contact before the distance between the image carrier and the transfer roller becomes D = 1.5E. At this time, the relationship of D> 1.5E holds.
上記実施例においては、転写紙を転写部へ導く搬送ガ
イドの角度は言及していないが、像担持体接線方向に対
して急激に立上げるほど転写紙の腰で像担持体に密着す
ることが解った。搬送ガイドの進入角度が35゜〜90゜の
範囲内であれば画像乱れのない鮮明な画像が得られた。In the above embodiment, the angle of the transport guide that guides the transfer paper to the transfer unit is not mentioned, but the more closely the image carrier tangentially rises, the more closely the transfer paper adheres to the image carrier at the waist of the transfer paper. I understand. When the entrance angle of the conveyance guide was in the range of 35 ° to 90 °, a clear image without image disturbance was obtained.
また、上記実施例で説明した搬送ガイド先端部に第４
図の様に補助搬送ガイド16を設けかつ像担持体３と補助
搬送ガイド16間の距離を0.5〜2.0mm、より効果的には0.
5〜1mmの範囲内で略平行に配設することによって、転写
紙10と給紙ローラ13間で発生した摩擦帯電により像担持
体上のトナー像を乱すことを防止出来る。これは転写紙
10上の電荷量は微少である為に、像担持体３上のトナー
像まで及ばず、転写紙10の電荷は補助ガイド16に逃げて
いくためと推定される。Also, the fourth end of the conveyance guide described in the above embodiment
As shown in the figure, an auxiliary conveyance guide 16 is provided, and the distance between the image carrier 3 and the auxiliary conveyance guide 16 is 0.5 to 2.0 mm, more effectively, 0.2 mm.
By arranging them substantially parallel within the range of 5 to 1 mm, it is possible to prevent the toner image on the image carrier from being disturbed by frictional charging generated between the transfer paper 10 and the paper feed roller 13. This is transfer paper
Since the amount of charge on the transfer paper 10 is very small, it does not reach the toner image on the image carrier 3, and it is estimated that the charge on the transfer paper 10 escapes to the auxiliary guide 16.
さらに、この補助ガイド板にトナーと同極性の電圧印
加してもトナー像は、補助ガイド板からの電界により乱
されず、又転写紙10に異常な摩擦帯電を有しても、トナ
ー乱れがないことが確認出来た。Further, even if a voltage having the same polarity as that of the toner is applied to the auxiliary guide plate, the toner image is not disturbed by the electric field from the auxiliary guide plate. It was confirmed that there was not.
転写ローラとしてはゴム内にカーボン、ZnOのような
導電性粒子を分散させて抵抗調整を行なったがそれによ
り内面のゴムの体積抵抗を104〜103［Ωcm］になる様に
調整しその外側に薄層50〜200μｍの材料で体積抵抗109
〜1012Ωcmにしてもよい。Carbon in the rubber as a transfer roller, Z n O was performed such conductive particles resistance adjustment by dispersing as adjusted thereby the volume resistivity of the rubber of the inner surface so as to become 10 4 ~10 3 [Ωcm] The outer layer is made of a 50-200 μm thin material with a volume resistance of 10 9
It may be up to 10 12 Ωcm.
［発明の効果］ 以上説明したように、画像形成装置で転写材と像担持
体の接触位置を規定した、ことにより鮮明な画像を得る
ことが可能となった。[Effects of the Invention] As described above, a clear image can be obtained by defining the contact position between the transfer material and the image carrier in the image forming apparatus.
第１図は本発明の画像形成装置の一実施例を示す概略断
面図、 第２図（Ａ）は従来の転写ローラを示す拡大図、 第２図（Ｂ）は本発明の転写ローラを示す拡大図、 第３図は転写ローラの印加電圧［KV］と転写材先端が像
担持体に接触し始める点における像担持体と転写ローラ
との距離との関係を示すグラフ、 第４図は本発明の画像形成装置の転写部の他の実施例を
示す断面図である。 図において、 ３は像担持体 ９は転写ローラ 10は転写紙 14は搬送ガイド 16は補助搬送ガイドFIG. 1 is a schematic sectional view showing an embodiment of the image forming apparatus of the present invention, FIG. 2 (A) is an enlarged view showing a conventional transfer roller, and FIG. 2 (B) is a transfer roller of the present invention. FIG. 3 is a graph showing the relationship between the applied voltage [KV] of the transfer roller and the distance between the image carrier and the transfer roller at the point where the leading end of the transfer material comes into contact with the image carrier. FIG. FIG. 9 is a cross-sectional view illustrating another embodiment of the transfer unit of the image forming apparatus of the present invention. In the figure, 3 is an image carrier 9 is a transfer roller 10 is a transfer paper 14 is a transport guide 16 is an auxiliary transport guide
───────────────────────────────────────────────────── フロントページの続き (72)発明者 木須 浩樹 東京都大田区下丸子３丁目30番２号 キ ヤノン株式会社内 (72)発明者 中村 俊治 東京都大田区下丸子３丁目30番２号 キ ヤノン株式会社内 (56)参考文献 特開 昭63−195678（ＪＰ，Ａ) 特開 昭61−32080（ＪＰ，Ａ) 特開 昭53−117433（ＪＰ，Ａ) 特開 昭56−35159（ＪＰ，Ａ) 特開 昭57−88474（ＪＰ，Ａ) ──────────────────────────────────────────────────続 き Continuation of the front page (72) Inventor Hiroki Kisu 3-30-2 Shimomaruko, Ota-ku, Tokyo Canon Inc. (72) Inventor Shunji Nakamura 3-30-2 Shimomaruko, Ota-ku, Tokyo Canon (56) References JP-A-63-195678 (JP, A) JP-A-61-32080 (JP, A) JP-A-53-117433 (JP, A) JP-A-56-35159 (JP, A A) JP-A-57-88474 (JP, A)
Claims (2)
持体とニップ部を形成する転写ローラであって、前記ニ
ップ部で前記像担持体から転写材へトナー像を転写し、
前記トナー像の帯電極性と逆極性の電圧が印加される転
写ローラと、を有する画像形成装置において、 転写材の先端が前記像担持体に接触し始める点におい
て、前記像担持体の回転中心と前記転写ローラの回転中
心を結んだ直線方向における前記像担持体と前記転写ロ
ーラとの距離をＤ（mm）、前記電圧をＥ（KV）とすると
Ｄ＞1.5Eが成り立つことを特徴とする画像形成装置。An image carrier that carries a toner image; and a transfer roller that forms a nip portion with the image carrier, wherein the nip portion transfers a toner image from the image carrier to a transfer material.
A transfer roller to which a voltage having a polarity opposite to the charging polarity of the toner image is applied, wherein at a point where the leading end of the transfer material starts to contact the image carrier, the rotation center of the image carrier is The image is characterized in that D> 1.5E holds when the distance between the image carrier and the transfer roller in a linear direction connecting the rotation center of the transfer roller is D (mm) and the voltage is E (KV). Forming equipment.
成するために前記トナー像の帯電極性と同極性に帯電す
る帯電手段を有することを特徴とする請求項１の画像形
成装置。2. An image forming apparatus according to claim 1, wherein said apparatus has a charging means for charging the toner image to have the same polarity as that of the toner image to form an electrostatic latent image on the image carrier. apparatus.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63332640A JP2801230B2 (en) | 1988-12-28 | 1988-12-28 | Image forming device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63332640A JP2801230B2 (en) | 1988-12-28 | 1988-12-28 | Image forming device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH02176779A JPH02176779A (en) | 1990-07-09 |
| JP2801230B2 true JP2801230B2 (en) | 1998-09-21 |
Family
ID=18257216
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP63332640A Expired - Lifetime JP2801230B2 (en) | 1988-12-28 | 1988-12-28 | Image forming device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2801230B2 (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2004109354A (en) | 2002-09-17 | 2004-04-08 | Hitachi Printing Solutions Ltd | Image forming apparatus |
| JP2005008391A (en) | 2003-06-20 | 2005-01-13 | Toshiba Corp | Image forming device |
| JP5346710B2 (en) * | 2009-06-30 | 2013-11-20 | 京セラドキュメントソリューションズ株式会社 | Image forming apparatus |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5635159A (en) * | 1979-08-30 | 1981-04-07 | Olympus Optical Co Ltd | Bias roller transfer device |
| JPS5788474A (en) * | 1980-11-22 | 1982-06-02 | Canon Inc | Transfer material feed-out guide of electrophotography device |
| JPS6132080A (en) * | 1984-07-24 | 1986-02-14 | Fuji Xerox Co Ltd | Transfer device of electrophotographic copying machine |
| JPS63195678A (en) * | 1987-02-10 | 1988-08-12 | Fujitsu Ltd | Transfer mechanism |
-
1988
- 1988-12-28 JP JP63332640A patent/JP2801230B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH02176779A (en) | 1990-07-09 |
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