JP2991747B2 - Electrophotographic equipment - Google Patents
Electrophotographic equipmentInfo
- Publication number
- JP2991747B2 JP2991747B2 JP2180026A JP18002690A JP2991747B2 JP 2991747 B2 JP2991747 B2 JP 2991747B2 JP 2180026 A JP2180026 A JP 2180026A JP 18002690 A JP18002690 A JP 18002690A JP 2991747 B2 JP2991747 B2 JP 2991747B2
- Authority
- JP
- Japan
- Prior art keywords
- intermediate transfer
- color
- transferred
- image
- toner image
- 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
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- Control Or Security For Electrophotography (AREA)
- Color Electrophotography (AREA)
Description
【発明の詳細な説明】 （産業上の利用分野） 本発明は、複数個の現像装置を有し、無端移動する感
光体上に形成した潜像を多色のトナーで現像し、そのト
ナー像を同じく無端移動する転写体上に重転写してフル
カラー画像を得る電子写真装置に関するものである。Description: BACKGROUND OF THE INVENTION (Industrial Application Field) The present invention has a plurality of developing devices, develops a latent image formed on an endlessly moving photosensitive member with a multicolor toner, and forms the toner image on the latent image. The present invention also relates to an electrophotographic apparatus for obtaining a full-color image by carrying out double transfer on a transfer body which also moves endlessly.
（従来の技術） 近年、色毎の静電潜像を形成した感光体上にトナーを
現像し、それらのトナー像を順次中間転写体に重転写し
た後、最後に一括して転写シートに転写してフルカラー
画像を得る電子写真装置が利用されている。(Prior Art) In recent years, toner has been developed on a photoreceptor on which an electrostatic latent image for each color has been formed, and the toner images have been successively superimposedly transferred to an intermediate transfer member, and finally transferred collectively to a transfer sheet. An electrophotographic apparatus for obtaining a full-color image is used.
例えば、特開昭55−90972号等には転写方式として感
光体ドラムや絶縁ドラム等の像担持体に形成したイエロ
ー、シアン、マゼンタのトナーを中間像担持体であるド
ラムあるいはベルト上に重ねて転写し、中間像担持体上
に形成された３色のトナーを転写体に一括転写する方法
が提案されている。以下に従来のカラー電子写真装置に
ついて説明する。For example, Japanese Patent Application Laid-Open No. 55-90972 discloses a transfer method in which yellow, cyan, and magenta toners formed on an image carrier such as a photosensitive drum or an insulating drum are superimposed on a drum or belt as an intermediate image carrier. A method has been proposed in which the three color toners formed on the intermediate image carrier are transferred and transferred onto the transfer body at one time. Hereinafter, a conventional color electrophotographic apparatus will be described.
第４図は従来のカラー電子写真装置を示す概略図であ
る。第４図の（41）は無端感光体ベルト、（42）は無端
中間転写体ベルト、（43），（44）および（45），（4
6）は夫々のベルトを張架するベルトプーリー、無端感
光体ベルト（41）の周囲には、帯電チャージャ（47）、
光学部（48）、イエロー，マゼンタ，シアン，ブラック
の各現像器（49Y），（49M），（49C），（49Bk）、中
間転写器（50）、クリーニング装置（51）、除電ランプ
（52）が設けられている。FIG. 4 is a schematic view showing a conventional color electrophotographic apparatus. In FIG. 4, (41) is an endless photoreceptor belt, (42) is an endless intermediate transfer belt, (43), (44) and (45), (4).
6) is a belt pulley that stretches each belt, around the endless photoreceptor belt (41), a charger (47),
Optical unit (48), yellow, magenta, cyan, and black developing units (49Y), (49M), (49C), (49Bk), intermediate transfer unit (50), cleaning device (51), static elimination lamp (52) ) Is provided.
光学部（48）から色毎のレーザ光の照射受けることに
より、無端感光体ベルト（41）上に静電潜像を形成し、
潜像は現像器（49Bk），（49C），（49M），（49Y）の
順に現像され、中間転写器（50）により、無端中間転写
体ベルト（42）に色重ねされ、転写器（53）によって転
写シート（54）に一括転写された後に、定着器（55）に
より定着されることでフルカラー画像として出力され
る。An electrostatic latent image is formed on the endless photoreceptor belt (41) by receiving laser light of each color from the optical unit (48),
The latent image is developed in the order of developing units (49Bk), (49C), (49M), and (49Y), and is superposed on the endless intermediate transfer belt (42) by the intermediate transfer unit (50). ), The toner image is collectively transferred to the transfer sheet (54), and then fixed by the fixing device (55) to be output as a full-color image.
（発明が解決しようとする課題） しかしながら、上記従来の構成では第５図のタイミン
グチャートに示すようA4サイズの転写シートを用いた場
合、転写シートに一括転写されたトナー像が定着される
直前においても、転写シートの一部は依然として第４色
目のイエローの現像と、感光体から中間転写体ベルトへ
のイエロートナー像の中間転写と、多重形成されたブラ
ック、シアン、マゼンタ、イエロートナー像の中間転写
体ベルトから転写シートへの転写とが同時に行われてお
り、そのために感光体ベルトの周速と中間転写体ベルト
の周速と定着器の周速を略同速度にしなければならな
い。(Problems to be Solved by the Invention) However, in the above-described conventional configuration, when an A4 size transfer sheet is used as shown in the timing chart of FIG. 5, immediately before the toner image collectively transferred to the transfer sheet is fixed. However, a part of the transfer sheet is still developed for the fourth color yellow, the intermediate transfer of the yellow toner image from the photoreceptor to the intermediate transfer belt, and the intermediate of the multiple formed black, cyan, magenta and yellow toner images. Since the transfer from the transfer belt to the transfer sheet is performed simultaneously, the peripheral speed of the photoreceptor belt, the peripheral speed of the intermediate transfer belt, and the peripheral speed of the fixing device must be substantially the same.
単色印字モードの際、転写シート上には１種のトナー
像しか付着しておらず、従って定着器の周速が中間転写
体ベルトの周速と略同速度であっても、トナー像を転写
シートに十分に溶融定着させるのに必要な熱量が供給さ
れる。ところが、フルカラー印字の際は、転写シート上
に４色トナー像が多層に積層されており、定着器の周速
が中間転写体ベルトの周速と略同速度では小型の定着器
では熱容量が不足し、トナー像を転写シートに十分に溶
融定着させることは困難であった。In the single-color printing mode, only one type of toner image adheres to the transfer sheet. Therefore, even if the peripheral speed of the fixing device is substantially the same as the peripheral speed of the intermediate transfer belt, the toner image is transferred. The amount of heat required to sufficiently fuse and fix the sheet is supplied. However, in full-color printing, four-color toner images are stacked in multiple layers on a transfer sheet, and the heat capacity of a small fixing device is insufficient when the peripheral speed of the fixing device is approximately the same as the peripheral speed of the intermediate transfer belt. However, it has been difficult to sufficiently fuse and fix the toner image on the transfer sheet.
更に、定着器を大きくすることで定着器の熱容量を上
げることは可能であるが、装置自体が大型化するのみな
らず、単色印字モードの際に過度の熱量が転写シートに
加えられるために、転写シートにカールが生じ画像品質
の劣化を招く等の問題が発生している。Further, it is possible to increase the heat capacity of the fixing device by increasing the size of the fixing device, but not only the device itself becomes large, but also in the single-color printing mode, an excessive amount of heat is applied to the transfer sheet. There have been problems such as curling of the transfer sheet and deterioration of image quality.
（課題を解決するための手段） 本発明は上記問題点を解決する為になされたものであ
り、フルカラー印字モードの際、感光体上に現像される
最終色のトナー像が転写シート１頁相当分完全に中間転
写体に転写された後に、中間転写体の周速を定着器の周
速と略同速度になるよう中間転写体の速度を下げる制御
手段を設けたことにある。更に、単色印字モードとフル
カラー印字モードの判断手段を備えて、単色印字モード
のときは上記中間転写体を減速させないようにすること
もできる。(Means for Solving the Problems) The present invention has been made to solve the above problems, and in a full-color printing mode, a final color toner image developed on a photoconductor is equivalent to one page of a transfer sheet. A control means is provided for lowering the speed of the intermediate transfer member so that the peripheral speed of the intermediate transfer member becomes substantially equal to the peripheral speed of the fixing device after the image is completely transferred to the intermediate transfer member. Further, a determination means for a single-color printing mode and a full-color printing mode may be provided so that the intermediate transfer body is not decelerated in the single-color printing mode.
（作用） 本発明は上記手段により、転写シートにトナー像を転
写する前に、中間転写体上には転写シート１頁相当分完
全な形で全色のトナー像の形成が行なわれるので、転写
シートにトナー像を転写する前に中間転写体の周速を定
着器の周速に合わせて遅くすることが可能で、小型の定
着器でさえも十分にトナー像を溶融定着させることがで
きる。よって、小型の定着器フルカラー印字時において
も高品質な画像を得ることができる。請求項２記載の発
明では、又単色印字モード時は速度を落とすことなく画
像を得ることができる。(Operation) According to the present invention, before the toner image is transferred to the transfer sheet, a full-color toner image corresponding to one page of the transfer sheet is formed on the intermediate transfer member. Before transferring the toner image to the sheet, the peripheral speed of the intermediate transfer body can be reduced in accordance with the peripheral speed of the fixing device, and even a small fixing device can sufficiently fuse and fix the toner image. Therefore, a high-quality image can be obtained even at the time of full-color printing of a small fixing device. According to the second aspect of the present invention, an image can be obtained without lowering the speed in the monochrome printing mode.
（実施例） 以下に本発明の一実施例における電子写真装置に関し
て図を用いて詳細に説明する。Embodiment An electrophotographic apparatus according to an embodiment of the present invention will be described below in detail with reference to the drawings.
第１図は本発明による電子写真装置の一例を示す概略
図であり、同図において、（１）は無端感光体ベルトで
あり、２個のベルトプーリー（２）および（３）の間に
張架支持されており、無端感光体ベルト（１）の周囲に
は、その回転方向の順に矢印で示すよう、帯電チャージ
ャ（４）、光学部（５）、イエロー，マゼンタ，シア
ン，ブラックを順に並べた各現像器（6Y），（6M），
（6C），（6Bk）、クリーニング装置（７）、除電ラン
プ（８）が設られている。また、マイラーフィルム等の
誘電体フィルムよりなる無端中間転写体ベルト（９）は
２個の搬送用ローラ（10），（11）間に張架支持されて
おり、無端感光体ベルト（１）から無端中間転写体ベル
ト（９）へのトナー像の転写を行うための中間転写器
（12）が無端中間転写体ベルト（９）を介して無端感光
体ベルト（１）と対向して設けられている。無端感光体
ベルト（１）と無端中間転写体ベルト（９）の周速が等
しくなるようベルトプーリー（２）および（10）は駆動
させられる。FIG. 1 is a schematic view showing an example of an electrophotographic apparatus according to the present invention, in which (1) is an endless photoreceptor belt, which is stretched between two belt pulleys (2) and (3). A charging charger (4), an optical unit (5), yellow, magenta, cyan, and black are arranged in this order around the endless photoreceptor belt (1) in the order of its rotation, as indicated by arrows. Developing units (6Y), (6M),
(6C), (6Bk), a cleaning device (7), and a static elimination lamp (8) are provided. An endless intermediate transfer belt (9) made of a dielectric film such as a Mylar film is stretched and supported between two transport rollers (10) and (11). An intermediate transfer device (12) for transferring the toner image to the endless intermediate transfer belt (9) is provided to face the endless photoreceptor belt (1) via the endless intermediate transfer belt (9). I have. The belt pulleys (2) and (10) are driven so that the peripheral speeds of the endless photosensitive belt (1) and the endless intermediate transfer belt (9) become equal.
第２図は、中間転写体ユニットの制御装置（14）によ
る制御動作の一例を示すフローチャートであり、その動
作に基づくタイミングチャートを第３図に示す。FIG. 2 is a flowchart showing an example of a control operation by the control device (14) of the intermediate transfer body unit, and a timing chart based on the operation is shown in FIG.
光学部（５）から青、緑、赤の３色のレーザ光を照射
することにより、無端感光体ベルト（１）上に色毎の静
電潜像を形成し、３種の潜像は現像器（6Bk），（6
C），（6M），（6Y）により、それぞれブラック、シア
ン、マゼンタ、イエローのトナーで順に現像され、中間
転写器（12）により、無端中間転写体ベルト（９）に色
重ねされる。無端中間転写体ベルト（９）に色重ねされ
た４種のトナー像は、矢印で示す回転方向に搬送され
る。By irradiating laser beams of three colors of blue, green and red from the optical part (5), electrostatic latent images for each color are formed on the endless photoreceptor belt (1), and the three types of latent images are developed. (6Bk), (6
C), (6M), and (6Y) are developed in order with black, cyan, magenta, and yellow toners, respectively, and are superimposed on the endless intermediate transfer belt (9) by the intermediate transfer unit (12). The four types of toner images superimposed on the endless intermediate transfer belt (9) are conveyed in the rotation direction indicated by the arrow.
無端中間転写体ベルト（９）を介してベルトプーリー
（10）と対向する位置に設けられた転写器（13）の位置
に色重ねされたトナー像の先端が到達した際、同時に最
終色の現像、中間転写工程が行なわれており、この際、
中間転写体ユニットの制御装置（14）により転写器（1
3）を作動させず、転写工程に入ることなく無端中間転
写体ベルト（９）上にトナー像を保持した状態で、無端
中間転写体ベルト（９）を１回転空回りさせる。そし
て、最後に無端中間転写体ベルト（９）上に転写される
イエロートナーが１頁相当分完全に転写されてしまった
後に、制御手段（14）により無端中間転写体ベルト
（９）の周速を定着器（17）の周速に合わせて減速さ
せ、無端中間転写体ベルト（９）と定着器（17）の周速
を略同速度にし、無端中間転写体ベルト（９）と転写器
（13）との間に給紙カセット（15）より給紙された転写
シート（16）を搬送させ、転写器（13）と定着器（17）
で順に転写、定着を行ない、フルカラー画像を出力す
る。When the leading end of the superimposed toner image reaches the position of the transfer device (13) provided at a position facing the belt pulley (10) via the endless intermediate transfer belt (9), the final color is simultaneously developed. , An intermediate transfer process is performed,
The transfer device (1) is controlled by the control device (14)
3) While the toner image is held on the endless intermediate transfer belt (9) without starting the transfer step without operating 3), the endless intermediate transfer belt (9) is caused to rotate by one rotation. Then, after the yellow toner finally transferred onto the endless intermediate transfer belt (9) has been completely transferred for one page, the peripheral speed of the endless intermediate transfer belt (9) is controlled by the control means (14). Is reduced in accordance with the peripheral speed of the fixing device (17), the peripheral speeds of the endless intermediate transfer belt (9) and the fixing device (17) are made substantially the same, and the endless intermediate transfer belt (9) and the transfer device ( The transfer sheet (16) fed from the paper cassette (15) is transported between the transfer device (13) and the transfer device (13) and the fixing device (17).
The transfer and fixation are performed in order to output a full-color image.
（発明の効果） 以上のように本発明は、中間転写体上に最終色までの
転写を完全に行った後に、定着器の能力の制約範囲内に
中間転写体の周速を減速させ、中間転写体ベルトの周速
を定着器の周速と略同速度としたことによってフルカラ
ー印字モードにおいて高品質な画像を得ることができ
る。又、請求項２記載の発明では、上記の効果の上、更
に単色印字モードのときは自動的に減速させず転写・定
着できるので高速印画できる。(Effects of the Invention) As described above, the present invention reduces the peripheral speed of the intermediate transfer member within the range of the capability of the fixing device after the transfer to the final color is completely performed on the intermediate transfer member. By setting the peripheral speed of the transfer belt to be substantially the same as the peripheral speed of the fixing device, a high-quality image can be obtained in the full-color printing mode. According to the second aspect of the present invention, in addition to the above-described effects, in the single-color printing mode, the image can be transferred and fixed without automatically decelerating, so that high-speed printing can be performed.
第１図は本実施例の電子写真装置の概略図、第２図は本
実施例のA4サイズを用いた場合のタイミングチャート、
第３図は中間転写体ユニット制御のためのフローチャー
ト、第４図は従来の電子写真装置の概略図、第５図は従
来のA4サイズを用いた場合のタイミングチャートであ
る。FIG. 1 is a schematic diagram of the electrophotographic apparatus of the present embodiment, FIG. 2 is a timing chart when the A4 size of the present embodiment is used,
FIG. 3 is a flowchart for controlling the intermediate transfer unit, FIG. 4 is a schematic diagram of a conventional electrophotographic apparatus, and FIG. 5 is a timing chart when a conventional A4 size is used.
───────────────────────────────────────────────────── フロントページの続き (72)発明者 藤原 博 大阪府門真市大字門真1006番地 松下電 器産業株式会社内 (72)発明者 川野 裕三 大阪府門真市大字門真1006番地 松下電 器産業株式会社内 (56)参考文献 特開 昭62−98868（ＪＰ，Ａ) 実開 平１−171470（ＪＰ，Ｕ) 特公 昭59−22226（ＪＰ，Ｂ２) ──────────────────────────────────────────────────の Continuing on the front page (72) Hiroshi Fujiwara 1006 Kadoma Kadoma, Kadoma City, Osaka Prefecture Inside Matsushita Electric Industrial Co., Ltd. (72) Yuzo Kawano 1006 Kadoma Kadoma Kadoma City, Osaka Matsushita Electric Industrial Co. (56) References JP-A-62-98868 (JP, A) JP-A-1-171470 (JP, U) JP-B-59-22226 (JP, B2)
Claims (2)
させる帯電手段と、前記感光体上に色毎の静電潜像を形
成させる潜像形成手段と、前記静電潜像を多色のトナー
で現像する複数個の現像手段と、前記現像手段による多
色のトナー像が順次重転写される無端移動する中間転写
体と、前記現像手段による多色のトナー像を中間転写体
に順次転写する中間転写手段と、前記中間転写体上に色
重ねされたトナー像を一括して転写シートに転写する転
写手段と、前記転写シートに転写されたトナー像を定着
させる定着手段とを有し、 前記転写シートの先端が前記転写手段に到達したとき中
間転写体の重転写されたトナー像の先端も転写手段の位
置に到達するように構成され、前記転写手段によりトナ
ー像を一括転写する前に前記感光体上に現像される最終
色のトナー像が中間転写体に転写されて前記転写シート
１頁相当分の全色トナー像が完全に前記中間転写体に転
写された後前記中間転写体の周速を前記定着器の周速と
略同速度となるよう減速させる制御手段を設けたことを
特徴とする電子写真装置。A photoconductor that moves endlessly; charging means for charging the photoconductor; latent image forming means for forming an electrostatic latent image for each color on the photoconductor; A plurality of developing means for developing with the color toner; an endlessly moving intermediate transfer body on which the multicolor toner images by the developing means are sequentially superimposed; and a multicolor toner image by the developing means on the intermediate transfer body. An intermediate transfer unit for sequentially transferring the toner image, a transfer unit for collectively transferring the toner images superimposed on the intermediate transfer body onto a transfer sheet, and a fixing unit for fixing the toner image transferred to the transfer sheet. When the leading end of the transfer sheet reaches the transfer unit, the top end of the toner image that has been double-transferred on the intermediate transfer body also reaches the position of the transfer unit, and the transfer unit transfers the toner images collectively. Before developed on the photoreceptor After the toner image of the final color to be transferred is transferred to the intermediate transfer member, and the full-color toner image corresponding to one page of the transfer sheet is completely transferred to the intermediate transfer member, the peripheral speed of the intermediate transfer member is reduced by the fixing device. An electrophotographic apparatus, further comprising control means for reducing the speed so as to be substantially the same as the peripheral speed.
単色印字モードを判断する手段を有し、単色印字モード
と判断した時は中間転写体を減速しないで中間転写体の
トナー像を転写シートに転写させる請求項１記載の電子
写真装置。2. The image forming apparatus according to claim 1, wherein said control means includes means for judging a full-color print mode and a single-color print mode. 2. The electrophotographic apparatus according to claim 1, wherein the image is transferred.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2180026A JP2991747B2 (en) | 1990-07-06 | 1990-07-06 | Electrophotographic equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2180026A JP2991747B2 (en) | 1990-07-06 | 1990-07-06 | Electrophotographic equipment |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0467174A JPH0467174A (en) | 1992-03-03 |
| JP2991747B2 true JP2991747B2 (en) | 1999-12-20 |
Family
ID=16076173
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2180026A Expired - Lifetime JP2991747B2 (en) | 1990-07-06 | 1990-07-06 | Electrophotographic equipment |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2991747B2 (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3814617B2 (en) * | 2003-05-01 | 2006-08-30 | キヤノン株式会社 | Image forming apparatus |
| US7043170B2 (en) | 2003-05-01 | 2006-05-09 | Canon Kabushiki Kaisha | Image forming apparatus having speed control of primary and secondary image transfers |
| JP2005352122A (en) * | 2004-06-10 | 2005-12-22 | Fuji Xerox Co Ltd | Image forming apparatus |
| JP2006058389A (en) * | 2004-08-17 | 2006-03-02 | Fuji Xerox Co Ltd | Image forming apparatus |
| JP4627032B2 (en) * | 2005-11-09 | 2011-02-09 | シャープ株式会社 | Image forming apparatus |
-
1990
- 1990-07-06 JP JP2180026A patent/JP2991747B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0467174A (en) | 1992-03-03 |
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