JPH06274050A - Transfer device - Google Patents
Transfer deviceInfo
- Publication number
- JPH06274050A JPH06274050A JP6414493A JP6414493A JPH06274050A JP H06274050 A JPH06274050 A JP H06274050A JP 6414493 A JP6414493 A JP 6414493A JP 6414493 A JP6414493 A JP 6414493A JP H06274050 A JPH06274050 A JP H06274050A
- Authority
- JP
- Japan
- Prior art keywords
- transfer charger
- photoconductor
- paper
- shield plate
- printing
- 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
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、感光体上で現像された
現像画像を転写チャージャにより用紙に転写する転写装
置に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a transfer device for transferring a developed image developed on a photoconductor to a sheet by a transfer charger.
【０００２】[0002]
【従来の技術】従来、図５に示すように、感光体１を回
転させる過程で帯電チャージャ２により帯電させ、その
帯電部分に露光器（図示せず）から画像信号に対応する
レーザー光３を走査して静電潜像を形成し、この静電潜
像を現像器４により現像し、転写チャージャ５のコロナ
放電作用によりトナーに対して電位差をもつ電荷を用紙
６に印加するより、感光体１上の現像画像を用紙６に転
写し、その用紙６に転写された転写画像を定着器７によ
り定着し、続いて、感光体１の外周に残るトナーをクリ
ーニングユニット８により払拭するとともに、除電ラン
プ９により感光体１の外周を一様に除電するようにした
画像形成装置がある。このような画像形成装置の印字幅
は使用する最大幅の用紙に合わせて決定されている。2. Description of the Related Art Conventionally, as shown in FIG. 5, a photosensitive member 1 is charged by a charging charger 2 while it is being rotated, and a laser beam 3 corresponding to an image signal is emitted from an exposing device (not shown) to the charged portion. The electrostatic latent image is formed by scanning, the electrostatic latent image is developed by the developing device 4, and the charge having the potential difference with respect to the toner is applied to the paper 6 by the corona discharge action of the transfer charger 5. The developed image on the sheet 1 is transferred to the sheet 6, the transferred image transferred to the sheet 6 is fixed by the fixing device 7, and then the toner remaining on the outer periphery of the photoconductor 1 is wiped by the cleaning unit 8 and the charge is removed. There is an image forming apparatus in which the outer periphery of the photoconductor 1 is uniformly discharged by the lamp 9. The print width of such an image forming apparatus is determined according to the maximum width of the paper used.
【０００３】[0003]
【発明が解決しようとする課題】印字に使用する用紙６
は、例えば葉書のように小さいものからＢ５、Ａ４、リ
ーガルサイズのように大きなものまであるが、葉書に印
字する場合にも転写チャージャ５からのコロナ放電が全
印字領域に作用されるため、感光体１は葉書と対向しな
い部位において転写チャージャ５からのコロナ放電を直
接あびて劣化することになる。印字に際しては、一枚印
字の度に感光体１の全域を除電して帯電電位を初期値に
戻した後に静電潜像を形成しているが、葉書のように小
さな用紙６を連続して印字した後では、感光体１は除電
してもコロナ放電を直接あびた部分とそれ以外の部分と
で帯電電位の初期値に差が生じる。このため、その後に
大きなサイズの用紙６に印字すると、画像に濃度ムラが
生じ、特にハーフトーンの画像を形成する場合に感光体
１の長手方向において印字ムラが生ずる問題がある。Paper used for printing 6
For example, from a small size such as a postcard to a large size such as B5, A4, and legal size, the corona discharge from the transfer charger 5 acts on the entire printing area even when printing on a postcard. The body 1 is directly exposed to corona discharge from the transfer charger 5 and deteriorates at a portion not facing the postcard. At the time of printing, the electrostatic latent image is formed after the entire area of the photoconductor 1 is erased and the charging potential is returned to the initial value after each printing, but a small paper 6 such as a postcard is continuously formed. After printing, even if the photoconductor 1 is discharged, there is a difference in the initial value of the charging potential between the portion directly subjected to corona discharge and the other portion. Therefore, if printing is subsequently performed on a large-sized sheet 6, uneven density occurs in the image, and there is a problem that uneven printing occurs in the longitudinal direction of the photoconductor 1 particularly when a halftone image is formed.
【０００４】[0004]
【課題を解決するための手段】本発明は、感光体上で現
像された現像画像を転写チャージャにより用紙に転写す
る転写装置において、用紙の幅方向のサイズに応じて前
記感光体と前記転写チャージャとの間に選択的に介装さ
れる遮蔽板を設けた。SUMMARY OF THE INVENTION The present invention is a transfer device for transferring a developed image developed on a photoconductor onto a sheet by a transfer charger, wherein the photoconductor and the transfer charger are arranged in accordance with the size of the sheet in the width direction. And a shielding plate which is selectively interposed between and.
【０００５】[0005]
【作用】幅の狭い用紙を使用するときに、転写チャージ
ャからのコロナ放電を遮蔽板により遮断することがで
き、これにより、コロナ放電が感光体に直接作用するこ
とを防止して、感光体の全域を除電したときに帯電電位
を均一な初期値に戻すことができ、したがって、幅の狭
い用紙への印字を続けた後に幅の広い用紙に印字した場
合においても、均一な画像を得ることができる。When a sheet of narrow width is used, the corona discharge from the transfer charger can be blocked by the shield plate, which prevents the corona discharge from directly acting on the photoconductor. The charge potential can be returned to a uniform initial value when the entire area is neutralized, so that a uniform image can be obtained even when printing is performed on wide paper after continuing printing on narrow paper. it can.
【０００６】[0006]
【実施例】本発明の第一の実施例を図１及び図２に基づ
いて説明する。図５において説明した部分と同一部分は
同一符号を用い説明も省略する（以下同様）。転写チャ
ージャ５は、上面開口のシールドケース５ａと、このシ
ールドケース５ａの両端に張設された放電ワイヤ５ｂと
よりなる。そして、感光体１と転写チャージャ５との間
に選択的に介装される遮蔽板１０が設けられている。こ
の遮蔽板１０の下面には転写チャージャ５のシールドケ
ース５ａの両側縁に摺動自在に保持された絶縁体１１が
固定されている。遮蔽板１０は金属板或いは導電性のポ
リエステルシート等により形成され、この遮蔽板１０に
は転写チャージャ５の放電電圧と等しい電圧を出力する
電源１２が接続されている。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be described with reference to FIGS. The same parts as the parts described in FIG. 5 are designated by the same reference numerals, and the description thereof will be omitted (same below). The transfer charger 5 includes a shield case 5a having an upper surface opening and discharge wires 5b stretched on both ends of the shield case 5a. A shielding plate 10 that is selectively interposed between the photoconductor 1 and the transfer charger 5 is provided. An insulator 11 slidably held on both side edges of the shield case 5a of the transfer charger 5 is fixed to the lower surface of the shield plate 10. The shield plate 10 is formed of a metal plate, a conductive polyester sheet, or the like, and a power source 12 that outputs a voltage equal to the discharge voltage of the transfer charger 5 is connected to the shield plate 10.
【０００７】このような構成において、感光体１の全印
字領域を対応する幅の広い用紙６に印字する場合には、
遮蔽板１０をシールドケース５ａから外し、或いは、遮
蔽板１０を印字領域の外側に摺動させる。幅の狭い用紙
６に印字する場合には、遮蔽板１０を用紙６が存在しな
い領域において摺動させる。したがって、転写チャージ
ャ５からのコロナ放電が感光体１に直接作用することが
なく、一枚の印字毎に感光体１の全域を除電ランプ９で
除電したときに、感光体１を帯電電位を一様に初期値に
戻すことができる。これにより、幅の狭い用紙６を複数
枚続けて印字し、その後に幅の広い用紙６に印字した場
合においても、感光体１の帯電電位が一様に初期値に設
定されるため、ムラのない均一な画像を得ることができ
る。また、電源１２から遮蔽板１０に印加する電圧に応
じて、放電ワイヤ５ｂへの印加電流を少なくすることが
できる。With such a structure, when printing the entire printing area of the photoconductor 1 on the corresponding wide paper 6,
The shield plate 10 is removed from the shield case 5a, or the shield plate 10 is slid to the outside of the print area. When printing on the narrow paper 6, the shield plate 10 is slid in an area where the paper 6 does not exist. Therefore, the corona discharge from the transfer charger 5 does not directly act on the photoconductor 1, and when the entire area of the photoconductor 1 is discharged by the charge eliminating lamp 9 for each printing, the charge potential of the photoconductor 1 is reduced to one. Can be returned to the initial value. As a result, even when a plurality of narrow papers 6 are continuously printed and then a wide paper 6 is printed, the charging potential of the photoconductor 1 is uniformly set to the initial value. It is possible to obtain a non-uniform image. Further, the current applied to the discharge wire 5b can be reduced according to the voltage applied from the power source 12 to the shield plate 10.
【０００８】次いで、本発明の第二の実施例を図３に、
第三の実施例を図４に示す。図３に示す導電性の遮蔽板
１０は抵抗１３を介して接地されている。また、図４に
示す導電性の遮蔽板１０はツェナダイオード１４を介し
て接地されている。Next, a second embodiment of the present invention is shown in FIG.
The third embodiment is shown in FIG. The conductive shield plate 10 shown in FIG. 3 is grounded via a resistor 13. Further, the conductive shield plate 10 shown in FIG. 4 is grounded via the Zener diode 14.
【０００９】このような構成において、抵抗１３及びツ
ェナダイオード１４は遮蔽板１０の電荷が逃げる作用を
抑制する作用を示すので、遮蔽板１０は転写チャージャ
５からの放電される電位に応じて帯電し抵抗値が上が
る。これにより、放電抵抗が少ない部分、すなわち、幅
の狭い用紙６の部分への放電量が増加するため、放電量
を一定にするならば放電ワイヤ５ｂに流す電流を少なく
することができる。In such a configuration, the resistor 13 and the Zener diode 14 have an action of suppressing the action of the charge of the shield plate 10 escaping, so that the shield plate 10 is charged according to the potential discharged from the transfer charger 5. The resistance value goes up. As a result, the amount of discharge to the portion having a small discharge resistance, that is, the portion of the sheet 6 having a narrow width increases, so that the current flowing through the discharge wire 5b can be reduced if the discharge amount is kept constant.
【００１０】また、絶縁処理を施した金属板、或いはポ
リエステルシート等により形成された絶縁体で遮蔽板１
０を形成した場合にも、絶縁性の遮蔽板１０は転写チャ
ージャ５から放電される電位に応じて帯電し抵抗値が上
がるため、同様の作用を得ることができる。Further, the shield plate 1 is made of an insulating material such as a metal plate or an insulating material such as a polyester sheet.
Even when 0 is formed, the insulating shield plate 10 is charged according to the potential discharged from the transfer charger 5 and its resistance value increases, so that the same effect can be obtained.
【００１１】[0011]
【発明の効果】本発明は、上述のように、用紙の幅方向
のサイズに応じて感光体と転写チャージャとの間に選択
的に介装される遮蔽板を設けたので、幅の狭い用紙を使
用するときに、転写チャージャからのコロナ放電を遮蔽
板により遮断することができ、これにより、コロナ放電
が感光体に直接作用することを防止して、感光体の全域
を除電したときに帯電電位を均一な初期値に戻すことが
でき、したがって、幅の狭い用紙への印字を続けた後に
幅の広い用紙に印字した場合においても、均一な画像を
得ることができるとの効果を有する。As described above, according to the present invention, since the shielding plate which is selectively interposed between the photoconductor and the transfer charger according to the size of the paper in the width direction is provided, the paper having a narrow width is provided. When using, the corona discharge from the transfer charger can be blocked by the shield plate, which prevents the corona discharge from directly acting on the photoconductor and charges when the entire area of the photoconductor is neutralized. The potential can be returned to a uniform initial value, and therefore, even when printing is performed on a wide paper after continuing printing on a narrow paper, a uniform image can be obtained.
【図１】本発明の第一の実施例を示すもので一部を断面
にした正面図である。FIG. 1 is a front view showing a first embodiment of the present invention with a partial cross section.
【図２】転写チャージャの平面図である。FIG. 2 is a plan view of a transfer charger.
【図３】本発明の第二の実施例における転写チャージャ
の平面図である。FIG. 3 is a plan view of a transfer charger according to a second embodiment of the present invention.
【図４】本発明の第三の実施例における転写チャージャ
の平面図である。FIG. 4 is a plan view of a transfer charger according to a third embodiment of the present invention.
【図５】従来の画像形成装置を示す縦断正面図である。FIG. 5 is a vertical cross-sectional front view showing a conventional image forming apparatus.
１ 感光体 ５ 転写チャージャ ６ 用紙 １０ 遮蔽板 1 Photoconductor 5 Transfer Charger 6 Paper 10 Shielding Plate
Claims (1)
ャージャにより用紙に転写する転写装置において、用紙
の幅方向のサイズに応じて前記感光体と前記転写チャー
ジャとの間に選択的に介装される遮蔽板を設けたことを
特徴とする転写装置。1. A transfer device for transferring a developed image developed on a photoconductor to a sheet by a transfer charger, wherein the photoconductor and the transfer charger are selectively interposed between the photoconductor and the transfer charger according to the size of the sheet in the width direction. A transfer device provided with a shielding plate to be mounted.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6414493A JPH06274050A (en) | 1993-03-23 | 1993-03-23 | Transfer device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6414493A JPH06274050A (en) | 1993-03-23 | 1993-03-23 | Transfer device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH06274050A true JPH06274050A (en) | 1994-09-30 |
Family
ID=13249595
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP6414493A Pending JPH06274050A (en) | 1993-03-23 | 1993-03-23 | Transfer device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH06274050A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009063645A (en) * | 2007-09-04 | 2009-03-26 | Ricoh Co Ltd | Electrophotographic apparatus |
| JP2009139401A (en) * | 2007-12-03 | 2009-06-25 | Ricoh Co Ltd | Electrophotographic apparatus |
| US10730105B2 (en) | 2013-01-25 | 2020-08-04 | Thyssenkrupp Steel Europe Ag | Method for producing a flat steel product with an amorphous, partially amorphous or fine-crystalline microstructure and flat steel product with such characteristics |
-
1993
- 1993-03-23 JP JP6414493A patent/JPH06274050A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009063645A (en) * | 2007-09-04 | 2009-03-26 | Ricoh Co Ltd | Electrophotographic apparatus |
| JP2009139401A (en) * | 2007-12-03 | 2009-06-25 | Ricoh Co Ltd | Electrophotographic apparatus |
| US10730105B2 (en) | 2013-01-25 | 2020-08-04 | Thyssenkrupp Steel Europe Ag | Method for producing a flat steel product with an amorphous, partially amorphous or fine-crystalline microstructure and flat steel product with such characteristics |
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