JPS62280872A - Multiplex image forming device - Google Patents
Multiplex image forming deviceInfo
- Publication number
- JPS62280872A JPS62280872A JP61125139A JP12513986A JPS62280872A JP S62280872 A JPS62280872 A JP S62280872A JP 61125139 A JP61125139 A JP 61125139A JP 12513986 A JP12513986 A JP 12513986A JP S62280872 A JPS62280872 A JP S62280872A
- Authority
- JP
- Japan
- Prior art keywords
- transfer material
- transfer
- turn
- image
- color
- 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
- 239000000463 material Substances 0.000 claims abstract description 42
- 230000005684 electric field Effects 0.000 claims description 2
- 238000000926 separation method Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 230000003068 static effect Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 230000008030 elimination Effects 0.000 description 2
- 238000003379 elimination reaction Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000003287 optical effect Effects 0.000 description 2
- 210000000078 claw Anatomy 0.000 description 1
- 239000003086 colorant Substances 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 238000005286 illumination Methods 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
Abstract
Description
【発明の詳細な説明】
３発明の詳細な説明
〔発明の産業上の利用分野〕
本発明は回転する転写材担持シート上に転写材を担持し
、転写材担持シート上の転写材に転写電界を付与して感
光ドラムや絶縁ドラム等の像担持体上に順次形成される
複数のトナー像を転写材上べ順次重ねて転写を行う装置
、例えばカラー複写機やカラープリンター等の多重画像
形成装置に関するものである。Detailed Description of the Invention 3. Detailed Description of the Invention [Industrial Application Field of the Invention] The present invention supports a transfer material on a rotating transfer material carrying sheet, and applies a transfer electric field to the transfer material on the transfer material carrying sheet. A device that sequentially overlays and transfers a plurality of toner images that are sequentially formed on an image carrier such as a photosensitive drum or an insulated drum onto a transfer material, such as a multi-image forming device such as a color copying machine or a color printer. It is related to.
第１図は本発明の適用可能な従来のフルカラー複写画像
を形成するためのカラー電子写真複写機の説明図である
１図において感光ドラム１の回りＶＣＦｉコロナ帯電器
２、露光々学系５、現儂装！１４、転写ドラム５、クリ
ーナー６が置かれている。光学系３は原稿走査部３ａと
色分解フィルタ３ｂから成る。現像装置ｆ ４ Ｖｉ、
中心軸４ｂの回りに４４個の現像器を有しており、４Ｙ
はイエロー現像器、ＡＭＶｉマゼンタ現像器、４Ｃはシ
アン現像器、４Ｂはブラック現像器という配置罠なって
いる。ま念、現像装置全体が回転し、各４色の現像を順
次行うものである。また転写ドラム５はシリンダ５ａ１
転写帯電器５ｂ。FIG. 1 is an explanatory diagram of a conventional color electrophotographic copying machine for forming a full-color copy image to which the present invention can be applied. Current outfit! 14, a transfer drum 5, and a cleaner 6 are placed. The optical system 3 includes a document scanning section 3a and a color separation filter 3b. developing device f 4 Vi,
It has 44 developing units around the central axis 4b, and 4Y
is a yellow developer, AMVi magenta developer, 4C is a cyan developer, and 4B is a black developer. The entire developing device rotates to sequentially develop each of the four colors. Further, the transfer drum 5 has a cylinder 5a1.
Transfer charger 5b.
転写材グリッパ−５ｃ、内側帯電器５ｄ、外側帯電器５
ｅとから成り、局面開口城に転写材担持シートが張られ
ている。Transfer material gripper 5c, inner charger 5d, outer charger 5
A transfer material carrying sheet is placed on the curved opening.
フルカラー画像の形成は、先ず感光ドラム１に青の色分
解静電潜像を形成し、イエロー現像器４Ｙにより現像す
る。−万、転写材は転写材カセット７より搬送系を介し
て転写ドラム５のグリッパ−５Ｃで把持される。転写ド
ラム５０回転の進行に伴い感光ドラム１上のトナー像が
転写帯電器５ｂにより転写材上に転写され同時に転写材
は、転写材担持シートに吸着される。To form a full-color image, first, a blue color-separated electrostatic latent image is formed on the photosensitive drum 1, and developed by the yellow developer 4Y. -10,000 The transfer material is gripped by the gripper 5C of the transfer drum 5 from the transfer material cassette 7 via the conveyance system. As the transfer drum 50 rotates, the toner image on the photosensitive drum 1 is transferred onto the transfer material by the transfer charger 5b, and at the same time, the transfer material is attracted to the transfer material carrying sheet.
内側帯を器５ｄは例えば交流電圧が印加され、転写帯電
器５ｂと同時に放１！を開始し、内側帯電器５ｄの放電
により転写材担持シー）Ｋ残留し比電荷を中和めるいは
減少させる。内側帯電器には交流電圧の他、転写帯電と
逆極性の直流電圧あるいは転写帯電と逆極性の直流電圧
を重畳させた交流電圧が印加嘔れる。ここで内側帯電器
５ｄは前回転スタート時から後回転終了時まで放電をα
ける。For example, an AC voltage is applied to the inner band charger 5d, and the transfer charger 5b discharges 1! The inner charger 5d discharges the transfer material-carrying sheet K, which neutralizes or reduces the specific charge. In addition to the alternating current voltage, the inner charger is applied with a direct current voltage having a polarity opposite to that of the transfer charging, or an alternating current voltage in which a direct current voltage having a polarity opposite to that of the transfer charging is superimposed. Here, the inner charger 5d discharges α from the start of the front rotation to the end of the rear rotation.
Let's go.
この動作全公知のフルカラー画像形成方法と同様にめと
５回即ちマゼンタ、シアン、ブラックについて繰夛返す
。こうして４色のトナー像の転写が終了すると外側帯電
器５ｅが放１１！を（内＠帯電器がＡＣのときＩｃはそ
れと逆位相ＡＣで）開始し、分離爪８によ〕転写ドラム
５から分離され、熱ローラ定着器９を介してトレイ１ａ
に排出される。This operation is repeated five times for magenta, cyan, and black in the same manner as in all known full-color image forming methods. When the transfer of the four-color toner image is completed in this way, the outer charger 5e is released 11! (When the charger is AC, Ic is AC with the opposite phase), is separated from the transfer drum 5 by the separating claw 8, and transferred to the tray 1a via the heat roller fixing device 9.
is discharged.
第２図は上記カラー電子写真複写機のタイム・シーケン
スの一例を示すもので、感光ドラム１の直径が例えば８
０ｆｌで、転写ドラム５の直径が１６０ｔｍ（感光ドラ
ム径との比が２：１）の場合で、感光ドラム及び転写ド
ラムの回転数に対する画像露光の時間、転写帯電器によ
る帯電の時間、内側帯電器による除電の時間、外側帯電
器による除電の時間を、転写材のサイズがＡ４（Ｉ工Ｓ
規格）サイズ及びム３サイＸｏ陀に６けて示したもので
ある。向、転写帯電は必ずしも非転写領域でオフにする
必要はないが、転写材のサイズの違いによる転写のタイ
ミングをわかフやすくする為に示しである。FIG. 2 shows an example of the time sequence of the above color electrophotographic copying machine, in which the diameter of the photosensitive drum 1 is, for example, 8.
0 fl and the diameter of the transfer drum 5 is 160 tm (ratio to the photosensitive drum diameter is 2:1), the image exposure time, the charging time by the transfer charger, the internal charging with respect to the rotational speed of the photosensitive drum and the transfer drum. The time for static elimination using the charger and the time for static elimination using the external charger are determined when the size of the transfer material is A4 (I engineering S).
Standard) size and size are shown in 6 digits. Although it is not necessarily necessary to turn off the transfer charging in the non-transfer area, it is shown to make it easier to understand the transfer timing depending on the size of the transfer material.
第２図の画像露光をはじめとじて各帯電器のオン・オフ
のタイミングかられかるとおシム３サイズのフルカラー
コピ一時は少なく共転雰ドラムー回祇分は画像露光間隔
が空りている。これは原稿走査光学系の走査後における
スタート位置への戻り時間、或いは現像器の入換えに伴
う移動時間などが必要であることに起因するもので、Ａ
５サイズの転写材へのコピーがＡ４サイズと同じ転写ド
ラム回転数ではできない場合が生じ、この場合転写ドラ
ム１回転分の空回転を要する。即ち、ｆＩＸ１色のトナ
ー像の転写後で第２色のトナー像が転写される迄の間、
第２色のトナー瀘の転写後で第３色のトナー像が転写さ
れる迄の１１１、及び第３色のトナー像の転写後で渠４
色のトナー像の転写迄の萌において、転写材がトナー像
が形成されていない感光ドラムと接触する工程を要する
。Starting from the image exposure shown in Fig. 2, the on/off timing of each charger is such that there are fewer image exposure intervals for a 3-size full-color copy, and for a co-rotating atmosphere drum. This is due to the time required for the document scanning optical system to return to the starting position after scanning, or the travel time required to replace the developing device.
There may be cases where copying onto a 5-size transfer material cannot be performed at the same transfer drum rotation speed as an A4-size transfer material, and in this case, the transfer drum needs to idle for one rotation. That is, after the fIX one color toner image is transferred until the second color toner image is transferred,
111 after the transfer of the second color toner filter until the third color toner image is transferred, and culvert 4 after the transfer of the third color toner image
In the process up to the transfer of the color toner image, a step is required in which the transfer material comes into contact with a photosensitive drum on which no toner image is formed.
従来、上記の空回転において既に転写材に転写されたト
ナーが感光ドラムに付着するといういわゆるオフセット
現象がおこ）、得られる画像にむらが生じた夛、濃度の
低下が生じ念シしてＡ３サイズのコピーの画質がＡ４サ
イズのものく比べ著しく劣ってしまうという問題点が６
つ凱
上記の問題が起こる理由のひとつとして、内側の帯電器
ｔ−第２図のように連続的に作動させて、空回転時にも
除電を行表っていることがあげられる。つｔシ、転写材
上に転写され九トナーを保持する転写材担持シートの電
荷が中和あるいは減少させられてしまい、トナーの転写
材に対する吸着力が減〕空回転中で感光ドラムと
□接する際に感光ドラムにオフセットしてい念。Conventionally, during the above-mentioned idle rotation, a so-called offset phenomenon occurs in which toner that has already been transferred to the transfer material adheres to the photosensitive drum), resulting in unevenness in the resulting image and a decrease in density. There is a problem that the image quality of the copy is significantly inferior to that of A4 size copy.
One of the reasons why the above problem occurs is that the inner charger t is operated continuously as shown in FIG. 2 to remove static electricity even during idle rotation. However, the charge on the transfer material carrying sheet that holds the toner transferred onto the transfer material is neutralized or reduced, and the adsorption force of the toner to the transfer material is reduced.
□Be careful not to offset the photosensitive drum when touching it.
上記の問題は、例えば本出願人が提案した多色画像形成
装置において、印刷用の色分解フィルム等から色校正の
九めＯカラーコピーを作成する場合においても発生する
。すなわち、上記の多色画像形成装置において、色分解
フィルム等を原稿台ガラス上の同一位置に正確に置く為
には、通常印刷用のレジスタービンを用いるが、このレ
ジスタービンに対し、色分解フィルム等のバンチ穴を合
わせ脱着させるのにある程度の時間を要する。従ってフ
ルカラーコピーモードにおける４回の原稿照明のあい間
の短かい時間に色分解フィルム等の原稿を交換する為に
原稿の交換に十分な時１１分感光ドラムと転写ドラムを
回転させる之めであ夛、この空回転時にトナー像の形成
されていない感光ドラムに転写材が相対し、一度転写材
上に転写され±トナー像が感光ドラムにオフセットする
現象があった。The above-mentioned problem also occurs when, for example, in the multicolor image forming apparatus proposed by the present applicant, a color copy for color proofing is created from a color separation film for printing or the like. In other words, in the above-mentioned multicolor image forming apparatus, a register bin for printing is normally used to place the color separation film etc. in the same position on the platen glass. It takes a certain amount of time to align the bunch holes and attach/detach. Therefore, in order to replace originals such as color separation film in the short time between four original illuminations in full color copy mode, it is necessary to rotate the photosensitive drum and transfer drum for 11 minutes, which is sufficient for replacing the original. During this idle rotation, the transfer material faces the photosensitive drum on which no toner image is formed, and once transferred onto the transfer material, there is a phenomenon in which the toner image is offset to the photosensitive drum.
本発明は前項に記した問題点を除去する手段でろ）、多
重転写において転写材がトナー像を担持していない感光
ドラムに相対する際におこるオフセットｆＡ象を防止或
いは軽減できる転写装ｗｔ提供することを目的としてい
る。The present invention is a means for eliminating the problems described in the previous section), and provides a transfer device wt that can prevent or reduce the offset fA phenomenon that occurs when a transfer material faces a photosensitive drum that does not carry a toner image in multiple transfers. The purpose is to
本発明を第３図のカラー電子写真機のタイムシーケンス
を用いて示す、第３図は第２図の従来シーケンスの内容
と同様でアシ、感光ドラム１の直径が例えば８０ｙｎで
、転写ドラム５の直径が１６００の場合で、感光ドラム
及び転写ドラムの回転数に対する画儂露光の時間、転写
帯電器による帯電の時間、内側帯電器はよる除電の時間
、外側帯電器による時間を転写材のサイズがム４及びム
３の場合に分けて示し念ものである。The present invention is illustrated using a time sequence of a color electrophotographic machine shown in FIG. 3. FIG. 3 is similar to the conventional sequence shown in FIG. When the diameter is 1600 mm, the image exposure time, charging time with the transfer charger, charge removal time with the inner charger, and time with the outer charger depend on the size of the transfer material relative to the rotational speed of the photosensitive drum and transfer drum. This is a reminder for the cases of M4 and M3.
Ａ４サイズ、フルカラーコピ一時は、前記したとお夛空
回転がない為、内側↑電器の動作と同じシーケンスをも
ってして構わない、Ａ３サイズのフルカラーコピ一時で
あるが、この場合においては空回転があるので、タイミ
ングチャートで示すとおシのオフ、オンをする必要があ
る。つまカ、１色目のイエローの転写が始まるとすぐに
内側帯電器の動作をオフする。また、転写材先端の空回
転時の感光ドラムと転写ドラムとのニップ通過をもって
動作を再開させる。For A4 size, full color copying, there is no idle rotation as mentioned above, so it is okay to use the same sequence as the inside ↑ electric appliance operation, for A3 size full color copying, but in this case, there is idle rotation. Therefore, it is necessary to turn the switch off and on as shown in the timing chart. Turn off the inner charger as soon as the first yellow color starts to be transferred. Further, the operation is restarted when the leading edge of the transfer material passes through the nip between the photosensitive drum and the transfer drum during idle rotation.
これらオフ、オンを計５回同じように繰夛返す。Repeat these off and on steps in the same way a total of 5 times.
但し、４色目ブラックの転写後は即座に転写材が排出さ
れるのでこのオフ、オンの動作は必要と嘔れない。However, since the transfer material is immediately discharged after the transfer of the fourth color, black, this off/on operation is not necessary.
これら一連の動作によ）オフセット防止、或いは画質に
影響しない程度に減少させる効果が得られる。Through these series of operations, it is possible to obtain the effect of preventing offset (or reducing it to the extent that it does not affect image quality).
上記の内０ｉｌＩ帝ｉ！器の印加電圧をオン、オフする
際、オフすることに代えて印加電圧をオンのときよ〕除
電が弱くなるように制御してもよい。Of the above! When the voltage applied to the device is turned on and off, the charge removal may be controlled to be weaker than when the applied voltage is turned on instead of being turned off.
以上説明したように内側帯電器が転写時にも動作するフ
ルカラーコピーの際、転写材がトナーを担持しない感光
ドラムと相対する場合において転写材上のトナーが感光
ドラムへオフセットする減少が抑えられ、転写むら、或
いは濃度低下のない良好な画像が得られる。As explained above, during full-color copying in which the inner charger operates also during transfer, when the transfer material faces a photosensitive drum that does not carry toner, offset of the toner on the transfer material to the photosensitive drum is suppressed, and the transfer A good image without unevenness or density reduction can be obtained.
第１図は従来のカラー電子写真複写機の要部説明図、第
２図Ｆ′ｉ第１図のカラー複写機の内側帯電器が毎回動
作する系におけるタイミングチャートの一部を示す説明
図、８ｇ３図は本発明を第１図のカラー複写機に適応さ
せたときのタイミングチャートを示す。
図において、１Ｆｉ感光ドラム、２Ｖｉ−次歪電器、３
は露光々学系、４Ｆｉ現像装置、５は転写ドラム、５ｂ
は転写帯電器、５ｄは内側帯電器、５θは外側帯電器で
ある。FIG. 1 is an explanatory diagram of main parts of a conventional color electrophotographic copying machine, FIG. 2 is an explanatory diagram showing part of a timing chart in a system in which the inner charger of the color copying machine of FIG. 1 operates every time, FIG. 8g3 shows a timing chart when the present invention is applied to the color copying machine shown in FIG. In the figure, 1Fi photosensitive drum, 2Vi-order distortion electric device, 3
5 is an exposure system, 4Fi developing device, 5 is a transfer drum, 5b
is a transfer charger, 5d is an inner charger, and 5θ is an outer charger.
Claims (1)
体上に順次形成されるトナー像を電界により重ね転写す
る多重画像形成装置において、 転写材担持シートの電荷を除電するコロナ 放電器を設け、転写材がトナー像を担持している像担持
体に相対する直前の転写材担持シートの電荷より、転写
材がトナー像を担持していない像担持体に相対する直前
の転写材担持シートの電荷を多くするように上記コロナ
放電器に印加する電圧を制御する手段を有する多重画像
形成装置。(1) In a multi-image forming apparatus that superimposes and transfers toner images sequentially formed on an image carrier onto a transfer material carried on a transfer material carrying sheet using an electric field, a corona discharger is used to remove electric charge from the transfer material carrying sheet. is provided, and the charge on the transfer material carrying sheet immediately before the transfer material faces an image carrier carrying no toner image is determined by the charge on the transfer material carrying sheet immediately before the transfer material faces an image carrier carrying no toner image. A multiplex image forming apparatus comprising means for controlling the voltage applied to the corona discharger so as to increase the charge on the sheet.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61125139A JPH0810370B2 (en) | 1986-05-30 | 1986-05-30 | Multiple image forming device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61125139A JPH0810370B2 (en) | 1986-05-30 | 1986-05-30 | Multiple image forming device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS62280872A true JPS62280872A (en) | 1987-12-05 |
| JPH0810370B2 JPH0810370B2 (en) | 1996-01-31 |
Family
ID=14902827
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP61125139A Expired - Fee Related JPH0810370B2 (en) | 1986-05-30 | 1986-05-30 | Multiple image forming device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0810370B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH02183276A (en) * | 1989-01-09 | 1990-07-17 | Sharp Corp | Fullcolor copying device |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS59154465A (en) * | 1983-02-21 | 1984-09-03 | Ricoh Co Ltd | Two-color electrophotographic copying machine |
-
1986
- 1986-05-30 JP JP61125139A patent/JPH0810370B2/en not_active Expired - Fee Related
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS59154465A (en) * | 1983-02-21 | 1984-09-03 | Ricoh Co Ltd | Two-color electrophotographic copying machine |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH02183276A (en) * | 1989-01-09 | 1990-07-17 | Sharp Corp | Fullcolor copying device |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0810370B2 (en) | 1996-01-31 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |