JPH0451025B2 - - Google Patents
Info
- Publication number
- JPH0451025B2 JPH0451025B2 JP60229985A JP22998585A JPH0451025B2 JP H0451025 B2 JPH0451025 B2 JP H0451025B2 JP 60229985 A JP60229985 A JP 60229985A JP 22998585 A JP22998585 A JP 22998585A JP H0451025 B2 JPH0451025 B2 JP H0451025B2
- Authority
- JP
- Japan
- Prior art keywords
- transfer
- voltage
- color
- paper
- ohp
- 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
- 239000000463 material Substances 0.000 claims description 16
- 239000003086 colorant Substances 0.000 claims description 7
- 238000010586 diagram Methods 0.000 description 3
- 238000000926 separation method Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 2
- 108091008695 photoreceptors Proteins 0.000 description 2
- 230000000295 complement effect Effects 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 239000003989 dielectric material Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 229920000728 polyester Polymers 0.000 description 1
Landscapes
- Control Or Security For Electrophotography (AREA)
Description
【発明の詳細な説明】
〔産業上の利用分野〕
この発明はカラー複写機の転写装置に関する。
更に詳しく言えば、この発明は普通紙およびオー
バヘツドプロジエクター用紙（OHP用紙）のい
ずれにも良好なカラー画像を作成することのでき
るカラー複写機の転写装置に関する。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] This invention relates to a transfer device for a color copying machine.
More specifically, the present invention relates to a transfer device for a color copying machine that can create good color images on both plain paper and overhead projector paper (OHP paper).
カラー複写法として、第２図に示すように、帯
電コロトロン１によつて均一に帯電した感光体２
に、所定色の色分解フイルター３を通した画像露
光４を施し形成した潜像を所定色（色分解フイル
ター色の補色）のトナーを有する現像機５によつ
て現像し、このトナー像を転写ドラム６にグリツ
プした転写材７に、転写コロトロン８によつて転
写する工程を複数回繰返して、同一の転写材に原
色を重ねてカラー画像を形成する装置が知られて
いる。転写ドラムとしては、通常支持体枠に絶縁
性の支持シートを巻回したものが用いられ、この
ドラムにグリツパー１１で転写材を挾み込んで支
持シートに静電吸着し、所定色のトナー像をこの
転写材に繰返し転写する。転写材としては普通紙
のほかオーバヘツドプロジエクター用用紙
（OHP用紙）が使用されるが、普通紙の場合に
は、各色共転写コロトロンの印加電圧は同一に設
定しておけば問題なく転写を行うことができる。
しかしOHP用紙の場合には、転写コロトロン印
加電圧を三色で同一としたのでは乱れた画像しか
得られない。この理由はOHP用紙は誘電体材料
であるために、１色目の転写時のコロナ電荷が
OHPシートに残留し、２色目（３色目）の転写
時には残留電荷のために転写コロトロンの放電電
流が低下してしまい、転写に不均一を生ずること
による。
In the color copying method, as shown in FIG. 2, a photoreceptor 2 uniformly charged by a charging corotron 1 is used.
The latent image formed by image exposure 4 through a color separation filter 3 of a predetermined color is developed by a developing device 5 having toner of a predetermined color (complementary color of the color separation filter color), and this toner image is transferred. An apparatus is known in which a process of transferring images onto a transfer material 7 gripped by a drum 6 by a transfer corotron 8 is repeated several times to form a color image by superimposing primary colors on the same transfer material. The transfer drum is usually a support frame with an insulating support sheet wound around it. A gripper 11 grips the transfer material onto this drum and electrostatically attracts it to the support sheet, forming a toner image of a predetermined color. is repeatedly transferred to this transfer material. In addition to plain paper, overhead projector paper (OHP paper) is used as the transfer material. In the case of plain paper, transfer can be performed without problems as long as the applied voltage of each color co-transfer corotron is set to the same value. It can be carried out.
However, in the case of OHP paper, if the transfer corotron application voltage is the same for the three colors, only a distorted image will be obtained. The reason for this is that OHP paper is a dielectric material, so the corona charge during the first color transfer is
This is because the charge remains on the OHP sheet, and when the second color (third color) is transferred, the discharge current of the transfer corotron decreases due to the residual charge, resulting in uneven transfer.
そこで、この対策として、１色目の電圧より２
色目、２色目の電圧より３色目を高めることが考
えられる。しかし１色目の印加電圧を普通紙の場
合の印加電圧と同じにして、電圧を高めていつて
画像乱れのない転写を行おうとすると３色目の印
加電圧が火花放電発生域まで上昇してしまう場合
がある。 Therefore, as a countermeasure to this problem, the voltage of 2
It is conceivable to raise the voltage of the third color more than the voltage of the second color. However, if you set the applied voltage for the first color to be the same as the applied voltage for plain paper and try to increase the voltage to transfer without image disturbance, the applied voltage for the third color may rise to the level where spark discharge occurs. be.
この発明の目的は、転写ドラム上の転写材に現
像像を所定回数転写してカラー画像を形成するカ
ラー複写機において、転写材が普通紙でもOHP
用紙でも良好な転写画像を得ることができる転写
装置を提供することにある。
The purpose of this invention is to provide a color copying machine that forms a color image by transferring a developed image to a transfer material on a transfer drum a predetermined number of times, even if the transfer material is plain paper or OHP.
It is an object of the present invention to provide a transfer device capable of obtaining a good transferred image even on paper.
本発明は転写コロトロン印加電圧を少なくとも
３段階に切り換える手段を設け、OHPモード時
の１色目の電圧を普通紙の転写電圧より低く設定
し、OHPモード時の３色目の印加電圧を火花放
電発生域よりも低くしたことを特徴とする。
The present invention is provided with means for switching the transfer corotron applied voltage in at least three stages, the voltage for the first color in OHP mode is set lower than the transfer voltage for plain paper, and the voltage applied for the third color in OHP mode is set in the spark discharge generation range. It is characterized by being lower than the
すなわち、本発明は転写ドラム上の転写材に現
像像を所定回数転写してカラー画像を形成する複
写機の転写装置において、転写コロトロンの印加
電圧切換手段を設け、OHP用紙を転写材とする
ときの印加電圧を２色目及び３色目でその前の転
写電圧より高く、かつ１色目の転写電圧を普通紙
を転写材とするときの印加電圧より低く設定した
転写装置である。 That is, the present invention provides a transfer device for a copying machine that transfers a developed image a predetermined number of times to a transfer material on a transfer drum to form a color image, and is provided with an applied voltage switching means for a transfer corotron, and when OHP paper is used as a transfer material. This is a transfer device in which the applied voltage for the second and third colors is set higher than the previous transfer voltage, and the transfer voltage for the first color is set lower than the applied voltage when using plain paper as the transfer material.
本発明転写装置の要部を第１図に示す。 The main parts of the transfer device of the present invention are shown in FIG.
転写コロトロン８は転写電圧切換手段１２の切
換スイツチS1，S2，S3及びS4により、それぞれ
V1，V2，V3及びV4の４段の電圧に設定できる。
ここでV1は普通紙の転写電圧、V2，V3及びV4は
それぞれOHP用紙の１色目、２色目及び３色目
の転写電圧である。普通紙を転写材とするときに
は、転写電圧をV1と一定にして１色目から３色
目までの転写を行うが、OHP用紙を転写材とす
るときには初回の転写電圧をV1より低いV2とし
て、転写ドラムの回転毎にV3，V4と電圧を切り
換える。このためには、第３図に示すように感光
体ドラムを駆動するサーボモータを取付けたエン
コーダの信号によつて転写電圧切換手段のスイツ
チを逐次S2→S3→S4と切換える制御を行えばよ
い。 The transfer corotron 8 is controlled by switching switches S 1 , S 2 , S 3 and S 4 of the transfer voltage switching means 12, respectively.
It can be set to four voltage levels: V 1 , V 2 , V 3 and V 4 .
Here, V 1 is the transfer voltage for plain paper, and V 2 , V 3 and V 4 are the transfer voltages for the first, second and third colors of OHP paper, respectively. When using plain paper as the transfer material, the first to third colors are transferred with a constant transfer voltage of V 1 , but when using OHP paper as the transfer material, the initial transfer voltage is set to V 2 , which is lower than V 1. , the voltage is switched between V 3 and V 4 every time the transfer drum rotates. For this purpose, as shown in Fig. 3, the transfer voltage switching means is controlled to be sequentially switched from S 2 to S 3 to S 4 based on a signal from an encoder equipped with a servo motor that drives the photosensitive drum. That's fine.
すなわちカラー複写機のOHPモードを選択し
た後、プリントボタンをONし、感光体ドラムの
回転毎に発するエンコーダからのパルス信号
（PR0）の２番目の信号（プリントボタンON後約
5.5秒）を検知してから2.9秒後S2スイツチをON
し、３番目の信号でS2スイツチOFF、S3スイツ
チONし、４番目の信号でS3スイツチOFF、S4ス
イツチONし、５番目の信号でS4信号を0FFすれ
ばよい。 In other words, after selecting the OHP mode of the color copier, turn on the print button, and output the second pulse signal (PR 0 ) from the encoder that is emitted every time the photosensitive drum rotates (approximately after turning on the print button).
2.9 seconds after detecting 5.5 seconds), turn on the S2 switch.
Then, at the third signal, turn off the S2 switch and turn on the S3 switch, turn off the S3 switch and turn on the S4 switch at the fourth signal, and turn the S4 signal to 0FF at the fifth signal.
本発明によれば、例えば支持スクリーンシート
として７０メツシユのポリエステルを使用した第
１に示す構成の装置で普通紙（ゼロツクス専用
紙）及びOHPシート（ゼロツクス専用OHPシー
ト）について、（）V1＝＋6.7KVDC、V2＝＋
6.4KVDC、V3＝＋7.0KVDC、V4＝＋7.3KVDC
（但し、転写コロトロンの放電ワイヤと感光体ド
ラムとの間隔13mm、以下同じ）、（）V1＝＋
7.0KVDC、V2＝＋6.4KVDC、V3＝＋6.9KVDC、
V4＝＋7.3KVDC、（）V1＝＋7.3KVDC、V2＝
＋6.4KVDC、V3＝＋6.9KVDC、V4＝＋
7.2KVDCのような設定電圧とすることによつて
OHP用紙に画像乱れのない転写像を得ることが
できた。 According to the present invention, for plain paper (Xerox exclusive paper) and OHP sheet (Xerox exclusive OHP sheet) in the apparatus having the configuration shown in the first example using 70 mesh polyester as a supporting screen sheet, ()V 1 =+6 .7KVDC, V 2 = +
6.4KVDC, V 3 = +7.0KVDC, V 4 = +7.3KVDC
(However, the distance between the discharge wire of the transfer corotron and the photoreceptor drum is 13 mm, the same applies hereinafter), ()V 1 = +
7.0KVDC, V 2 = +6.4KVDC, V 3 = +6.9KVDC,
V 4 = +7.3KVDC, ()V 1 = +7.3KVDC, V 2 =
+6.4KVDC, V 3 = +6.9KVDC, V 4 = +
By setting voltage like 7.2KVDC
It was possible to obtain a transferred image on OHP paper without any image disturbance.
この発明は、OHPモード時の１色目の転写電
圧を普通紙の転写電圧より低く設定し、OHP用
紙への第２色目、第３色目の転写電圧を徐々に高
め、かつ第３色目の転写電圧を火花放電開始電圧
より低目に設定したものであり、OHP用紙への
転写効率が一定となり、かつ全体的に転写効率を
低めに抑えることにより過剰のトナー付着を防止
し、OHP発色性の良好なカラー画像を形成する
ことができる。
This invention sets the transfer voltage for the first color in OHP mode lower than the transfer voltage for plain paper, gradually increases the transfer voltage for the second and third colors to OHP paper, and sets the transfer voltage for the third color to be lower than that for plain paper. is set lower than the spark discharge starting voltage, the transfer efficiency to OHP paper is constant, and by keeping the overall transfer efficiency low, excessive toner adhesion is prevented, resulting in good OHP color development. It is possible to form colorful color images.
第１図は本発明転写装置要部の概略図、第２図
はカラー複写機の概略図、第３図は本発明の転写
装置の制御タイミング図である。
図中符号、１……帯電コロトロン、２……感光
体ドラム、３……色分解フイルター、４……画像
露光、５……現像機、６……転写ドラム、７……
転写材、８……転写コロトロン、９……定着器、
１０……カセツト、１１……グリツパー、１２…
…転写電圧切換手段、s1，S2，s3，s4……スイツ
チ。
FIG. 1 is a schematic diagram of the main parts of the transfer device of the present invention, FIG. 2 is a schematic diagram of a color copying machine, and FIG. 3 is a control timing diagram of the transfer device of the present invention. Symbols in the figure: 1... Charging corotron, 2... Photosensitive drum, 3... Color separation filter, 4... Image exposure, 5... Developing machine, 6... Transfer drum, 7...
Transfer material, 8... Transfer corotron, 9... Fixing device,
10...Cassette, 11...Gripper, 12...
...Transfer voltage switching means, s1 , S2 , s3 , s4 ...switch.
Claims (1)
写してカラー画像を形成する複写機の転写装置に
おいて、転写コロトロンの印加電圧切換手段を設
け、OHP用紙を転写材とするときの印加電圧を
２色目及び３色目でその前の転写電圧より高く、
かつ１色目の転写電圧を普通紙を転写材とすると
きの印加電圧より低く設定したことを特徴とする
転写装置。1. In a copying machine transfer device that transfers a developed image a predetermined number of times to a transfer material on a transfer drum to form a color image, a transfer corotron applied voltage switching means is provided to change the applied voltage when OHP paper is used as a transfer material. The transfer voltage for the second and third colors is higher than the previous one,
A transfer device characterized in that the transfer voltage for the first color is set lower than the voltage applied when using plain paper as the transfer material.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP60229985A JPS6290674A (en) | 1985-10-17 | 1985-10-17 | Transfer device for color copying machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP60229985A JPS6290674A (en) | 1985-10-17 | 1985-10-17 | Transfer device for color copying machine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6290674A JPS6290674A (en) | 1987-04-25 |
| JPH0451025B2 true JPH0451025B2 (en) | 1992-08-17 |
Family
ID=16900791
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP60229985A Granted JPS6290674A (en) | 1985-10-17 | 1985-10-17 | Transfer device for color copying machine |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6290674A (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2693771B2 (en) * | 1987-11-10 | 1997-12-24 | 株式会社リコー | Color image forming equipment |
| JPH0786714B2 (en) * | 1989-01-09 | 1995-09-20 | シャープ株式会社 | Full color copying machine |
| JP2603133B2 (en) * | 1989-05-31 | 1997-04-23 | キヤノン株式会社 | Image forming device |
| JP2002328548A (en) * | 2001-02-28 | 2002-11-15 | Canon Inc | Image forming device |
-
1985
- 1985-10-17 JP JP60229985A patent/JPS6290674A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6290674A (en) | 1987-04-25 |
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