JPH0454613A - Method and device for adjusting image forming position - Google Patents

Method and device for adjusting image forming position

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Publication number
JPH0454613A
JPH0454613A JP2165940A JP16594090A JPH0454613A JP H0454613 A JPH0454613 A JP H0454613A JP 2165940 A JP2165940 A JP 2165940A JP 16594090 A JP16594090 A JP 16594090A JP H0454613 A JPH0454613 A JP H0454613A
Authority
JP
Japan
Prior art keywords
image forming
photoreceptor
photosensitive body
transfer
point
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
Application number
JP2165940A
Other languages
Japanese (ja)
Other versions
JP2929671B2 (en
Inventor
Mamoru Kido
城戸 衛
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Fujifilm Business Innovation Corp
Original Assignee
Fuji Xerox Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Fuji Xerox Co Ltd filed Critical Fuji Xerox Co Ltd
Priority to JP2165940A priority Critical patent/JP2929671B2/en
Publication of JPH0454613A publication Critical patent/JPH0454613A/en
Application granted granted Critical
Publication of JP2929671B2 publication Critical patent/JP2929671B2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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  • Counters In Electrophotography And Two-Sided Copying (AREA)
  • Exposure Or Original Feeding In Electrophotography (AREA)
  • Control Or Security For Electrophotography (AREA)
  • Color Electrophotography (AREA)
  • Control Of Position Or Direction (AREA)

Abstract

PURPOSE:To correct the misalignment by a simple constitution and at a low cost by setting the ratio of a fundamental frequency which depends on an average angular velocity of a photosensitive body to a rotary fluctuation frequency component of the photosensitive body to an integer. CONSTITUTION:A photosensitive body 1 and a transfer drum 5 rotate in the direction as indicated with an arrow, respectively and an image developed on the photosensitive body 1 is transferred to paper 18 by a transfer device 8. An angle obtained by measuring an angle AOB made by an image forming point 21(A) and a transfer point 22(B) on the photosensitive body 1 against the center 20(0) of the photosensitive body 1, along the rotating direction of the photosensitive body 1 from the image forming point 21(A) is denoted as theta1. In a rotary fluctuation component of this photosensitive body 1, a main vibration frequency component is denoted as f1. However large finite amount the misalignment amount of the photosensitive body 1 caused by a rotary angular velocity fluctuation of the photosensitive body 1 may be, it does not become a misalignment on a print sample, when f1/f0 is an integer. In such a way, the image forming position can be adjusted without using a motor of high accuracy.

Description

【発明の詳細な説明】 r産業上の利用分野1 本発明は、用紙搬送・転写用媒体を有する画像形成出力
装置において、感光体の回転角速度変動に伴う位置ずれ
を補正できるようにした画像形成位置調整方法および装
置に関する。
Detailed Description of the Invention r Industrial Field of Application 1 The present invention relates to an image forming apparatus having a paper conveyance/transfer medium, which is capable of correcting positional deviations caused by fluctuations in the rotational angular velocity of a photoreceptor. The present invention relates to a position adjustment method and device.

[従来の技術1 用紙搬送・転写用転写ドラムを有する画像形成装置、例
えばフルカラー用複写機等では、感光体上に順次形成さ
れたイエロー、シアン、マゼンタの3色もしくはブラッ
クを加えた4色の画像が、メツシュが張られた転写ドラ
ム上に静電吸着搬送された用紙に転写されフルカラーの
コピーが得られる。このとき、感光体の回転角速度変動
に伴う位置ずれ(プリント上の理想位置に対する偏差)
が発生し、最終的には色ずれどなって現れてくる。特に
、転写ドラム周囲に複数の感光体が配置されてlパスで
フルカラーのプリントが得られるようなタンデム型のフ
ルカラープリンターにおいては、各感光体の持つ回転角
速度変動はそれぞれ異なる場合が多く、プリンントの色
ずれどなって現れ著しく画質を劣化させることになる。
[Prior art 1] In an image forming apparatus having a transfer drum for conveying and transferring paper, such as a full-color copying machine, three colors of yellow, cyan, and magenta or four colors including black are sequentially formed on a photoreceptor. The image is transferred to a sheet of paper that is electrostatically transported onto a transfer drum covered with a mesh, resulting in a full-color copy. At this time, positional deviation (deviation from the ideal position on the print) due to fluctuations in the rotational angular velocity of the photoconductor
occurs, and eventually appears as a color shift. In particular, in tandem full-color printers in which multiple photoreceptors are arranged around the transfer drum and full-color prints can be obtained in one pass, the rotational angular velocity fluctuations of each photoreceptor are often different, and the print This results in color shift, which significantly deteriorates the image quality.

各感光体の回転精度を極力向上させ、色ずれが問題とな
らないレベルまで回転精度を上げれば問題ないわけであ
るが、そうするためにはコスト高になり現実的ではない
There would be no problem if the rotation accuracy of each photoreceptor was improved as much as possible to a level where color misregistration would not be a problem, but doing so would increase the cost and would be impractical.

E本発明が解決しようとしている課題]本発明は、前述
の事情に鑑みてなされたもので、簡単な構成および低コ
ストな位置ずれの補正が可能な画像形成位置調整方法お
よび装置を提供することを目的とする。さらに、本発明
は、位置ずれを補正し高品位の画質を得ることを目的と
する。
E. Problems to be Solved by the Present Invention] The present invention has been made in view of the above-mentioned circumstances, and it is an object of the present invention to provide an image forming position adjustment method and apparatus that have a simple configuration and are capable of correcting positional deviations at low cost. With the goal. A further object of the present invention is to correct positional deviations and obtain high quality images.

[課題を解決するための手段1 本発明の位置ずれの補正方法は、感光体の回転角速度変
動に伴う位置ずれを、その振動成分周波数に着目して、
感光体上の結像から転写までの角度と感光体の平均角速
度に依存する基本周波数との関係を整数比とすることを
特徴とする。
[Means for Solving the Problems 1] The positional deviation correction method of the present invention corrects positional deviations due to rotational angular velocity fluctuations of the photoconductor by focusing on its vibration component frequency.
It is characterized in that the relationship between the angle from image formation on the photoreceptor to transfer and the fundamental frequency that depends on the average angular velocity of the photoreceptor is an integer ratio.

[作用] プリントサンプル上の画像の位置ずれに対する感光体の
回転変動に伴う位置ずれの比が、感光体の回転変動周波
数成分に対する感光体の平均角速度に依存する基本周波
数の比の周期関数になり、感光体の回転変動周波数成分
に対する感光体の平均角速度に依存する基本周波数の比
を整数にすることにより、プリントサンプル上の画像の
位置ずれを実質上なくすことができるものである。
[Function] The ratio of the positional deviation due to the rotational fluctuation of the photoreceptor to the positional deviation of the image on the print sample becomes a periodic function of the ratio of the fundamental frequency that depends on the average angular velocity of the photoreceptor to the rotational fluctuation frequency component of the photoreceptor. By setting the ratio of the fundamental frequency dependent on the average angular velocity of the photoreceptor to the rotational fluctuation frequency component of the photoreceptor to an integer, it is possible to substantially eliminate the positional shift of the image on the print sample.

[実施例1 以下、本発明を実施例を基に詳細に説明する。[Example 1 Hereinafter, the present invention will be explained in detail based on Examples.

本発明の位置ずれ補正法を用いた一つの例としてのカラ
ー複写機の基本構成を第3図に示す。感光体1の回りに
帯電器2、光学系ユニット3、シアン、マゼンタ、イエ
ロー、ブラックの各色に対応した現像器4C14M、4
Y、4K、転写ドラム5、クリーニング前処理ユニット
6、クリーニングユニット7が配置されている。転写ド
ラム5の近傍には転写器8、剥離除電器9、剥離爪10
等が配置されている。カセットトレイ11上の転写紙は
、給紙ロール12、レジストロール13等を通り転写ド
ラム上に保持され、感光体1上で現像された各像が順次
転写紙に転写された後、転写ドラム5から剥離され、定
着器14、排紙ロール15等を通り排紙トレイ16に排
紙される。
FIG. 3 shows the basic configuration of a color copying machine as an example using the positional deviation correction method of the present invention. Around the photoconductor 1 are a charger 2, an optical system unit 3, and developing devices 4C14M and 4 corresponding to each color of cyan, magenta, yellow, and black.
Y, 4K, transfer drum 5, cleaning pre-processing unit 6, and cleaning unit 7 are arranged. In the vicinity of the transfer drum 5, there are a transfer device 8, a peeling static eliminator 9, and a peeling claw 10.
etc. are arranged. The transfer paper on the cassette tray 11 passes through a paper feed roll 12, a registration roll 13, etc., and is held on a transfer drum, and after each image developed on the photoreceptor 1 is sequentially transferred to the transfer paper, the transfer paper is transferred to the transfer drum 5. The paper is peeled off from the paper, passes through a fixing device 14, a paper discharge roll 15, etc., and is discharged to a paper discharge tray 16.

転写部の詳細を第4図に示す。転写ドラム5は、用紙サ
イズ分の開口部が設けられたA1等の支持ドラムに金属
製のメツシュあるいはマイラー等の誘電体もしくは半誘
電体の用紙搬送媒体17が張りつけられている。用紙1
8はグリッパ−19で先端部がくわえこまれた後、用紙
搬送媒体17の表面に静電気力等で吸着され搬送される
。感光体1および転写ドラム5は各々矢印の方向に回転
し感光体1上で現像された像は転写器8によって用紙1
8に転写される。感光体1の中心20(0)に対して感
光体1上の結像点21(A)と転写点22(B)のなす
角AOBを結像点21(A)から感光体1の回転方向に
沿って測った角度を01とする。
Details of the transfer section are shown in FIG. The transfer drum 5 has a support drum such as A1 having an opening corresponding to the size of the paper, and a paper transport medium 17 made of a dielectric or semi-dielectric material such as metal mesh or mylar is pasted onto the support drum. Paper 1
After the leading end of the sheet 8 is gripped by the gripper 19, it is attracted to the surface of the sheet conveying medium 17 by electrostatic force or the like and is conveyed. The photoreceptor 1 and the transfer drum 5 each rotate in the direction of the arrow, and the image developed on the photoreceptor 1 is transferred to the paper 1 by the transfer device 8.
It is transferred to 8. The angle AOB formed by the imaging point 21 (A) and the transfer point 22 (B) on the photoreceptor 1 with respect to the center 20 (0) of the photoreceptor 1 is defined as the rotation direction of the photoreceptor 1 from the imaging point 21 (A). Let the angle measured along the line be 01.

矢印の方向に回転する感光体1の回転精度をロータリー
エンコーダー等でピックアップした結果を第5図に示す
。上のグラフは速度変動のデータで、下のグラフはその
高速フーリエ変換(FFT)解析結果である。感光体1
の回転変動成分の内、主な振動周波数成分はflもしく
はf2であることが分かる。これらの振動周波数成分子
1もしくはf2と、第4図に示したθ1に依存する基本
周波数foとは密接な関係があり、flもしくはf2と
foの関係によってはプリント上に現れる位置ずれ(理
想的な位置からの偏差)が増加したり減少したりする。
FIG. 5 shows the results obtained by picking up the rotation accuracy of the photoreceptor 1 rotating in the direction of the arrow using a rotary encoder or the like. The upper graph is the speed fluctuation data, and the lower graph is the fast Fourier transform (FFT) analysis result. Photoreceptor 1
It can be seen that the main vibration frequency component among the rotational fluctuation components is fl or f2. There is a close relationship between these vibration frequency components 1 or f2 and the fundamental frequency fo that depends on θ1 shown in Fig. 4, and depending on the relationship between fl or f2 and fo, positional deviation (ideal deviation from a normal position) increases or decreases.

本発明はこの効果を積極的に利用したものである。The present invention actively utilizes this effect.

感光体1の回転角速度ω(1)は次式で表される。The rotational angular velocity ω(1) of the photoreceptor 1 is expressed by the following equation.

ω(t)=ωm叫Δωi、、、)e08ω1−t(1)
(ω。は平均回転各速度) (Δω101.は1番目の周波数の角速度変動幅)第5
図で示したFFT解析の結果はに=2の場合でrlおよ
びf2の主振動周波数成分を持つ。
ω(t)=ωm screamΔωi,,,)e08ω1−t(1)
(ω. is the average rotation speed) (Δω101. is the angular velocity fluctuation width of the first frequency) 5th
The result of the FFT analysis shown in the figure has main vibration frequency components of rl and f2 in the case of 2.

ユニで感光体1上の結像点21から転写点22までの角
度θ1に依存する基本周波数foとの関係が重要となる
。foは次式で表される。
The relationship with the fundamental frequency fo, which depends on the angle θ1 from the imaging point 21 on the photoreceptor 1 to the transfer point 22, is important. fo is expressed by the following formula.

fo= 1/16 :(θ1’(’m)−=ωmlθ1
(2)(toは01間の時間) プリントサンプル上での位置ずれΔX(p)と感光体の
回転変動ω(1)に伴う位置ずれΔx(M、Q、)は各
々次の式で表される。
fo= 1/16 :(θ1'('m)-=ωmlθ1
(2) (to is the time between 01) The positional deviation ΔX(p) on the print sample and the positional deviation Δx(M, Q,) due to the rotational fluctuation ω(1) of the photoconductor are each expressed by the following equations. be done.

Δx(p)=F(fi/fg)Δc、+i、、、、/I
Ifi      (3)(関数Fは周期関数) i=1の場合、Δ〜、Q、)は次式で表される。
Δx(p)=F(fi/fg)Δc,+i,,,/I
Ifi (3) (Function F is a periodic function) When i=1, Δ~, Q, ) is expressed by the following equation.

Δx(M、Q、)”Δω、、、、/IIf1     
    (5)(3)および(5)式からプリントサン
プル上での位置ずれΔX(1)と感光体の回転変動ω(
1)に伴う位置ずれΔx(M、Q、)の比を取れば次式
で表される。
Δx(M,Q,)”Δω, , , /IIf1
(5) From equations (3) and (5), the positional deviation ΔX(1) on the print sample and the rotational fluctuation ω(
If the ratio of the positional deviation Δx (M, Q,) associated with 1) is taken, it is expressed by the following equation.

ΔX(pゾΔx、、、)”= F(fi/f□)   
            (6)ここでF(filfo
)は、(fH/f6)=n(整数)の時F(fi/f0
戸0になり、(fllfo) =n + (1/2)の
時F(fi/f□) = aになる。
ΔX(pzoΔx,,,)”=F(fi/f□)
(6) Here F(filfo
) is F(fi/f0) when (fH/f6)=n (integer)
When the door becomes 0 and (fllfo) = n + (1/2), F(fi/f□) = a.

この式を基に、プリントサンプル上での位置ずれΔX(
1)に対する感光体の回転変動Δω(1)に伴う位置ず
れΔX(M、Q、)の比を縦軸に取り、回転変動周波数
成分子1と基本周波数fQとの比f1/fQを横軸に取
ったグラフを第1図に示す。第1図からfllfoが整
数nを取るときプリントサンプル上の位置ずれ量はほぼ
ゼロとなる。このことは、感光体の回転角速度変動に伴
う感光体1の位置ずれ量がどんなに大きな有限量であっ
ても、fllfoが整数であればプリントサンプル上で
の位置すれとはならないことを示す。
Based on this formula, the positional deviation ΔX(
The vertical axis is the ratio of the positional deviation ΔX (M, Q,) due to the rotational fluctuation Δω(1) of the photoconductor to 1), and the horizontal axis is the ratio f1/fQ between the rotational fluctuation frequency component 1 and the fundamental frequency fQ. The graph taken in Figure 1 is shown in Figure 1. From FIG. 1, when fllfo takes an integer n, the amount of positional deviation on the print sample becomes almost zero. This shows that no matter how large the finite amount of positional deviation of the photoreceptor 1 is due to fluctuations in the rotational angular velocity of the photoreceptor, if fllfo is an integer, it will not result in positional deviation on the print sample.

fllfoがn+(1/2)になると逆にずれ量が極大
になり、周期性を持って繰り返される。i=2の場合も
同様になる。以上のように、本発明は感光体の回転精度
が特に高くなくとも、プリント上での位置ずれを補正で
きるところが特徴である。つまり基本周波数foを感光
体の回転振動周波数f1あるいはf2に対し整数倍もし
くはそれに近いところまで変化させることでプリント上
での位置ずれを補正できるところが特徴である。具体的
に基本周波数foを変化させるには、結像点21から転
写点22の間の角度θ1をうまく調整すればよい。
Conversely, when fllfo becomes n+(1/2), the amount of deviation becomes maximum and is repeated with periodicity. The same holds true for i=2. As described above, the present invention is characterized in that positional deviation on a print can be corrected even if the rotation accuracy of the photoreceptor is not particularly high. In other words, a feature is that positional deviations on a print can be corrected by changing the fundamental frequency fo to an integral multiple of the rotational vibration frequency f1 or f2 of the photoreceptor or to a value close to it. Specifically, in order to change the fundamental frequency fo, the angle θ1 between the imaging point 21 and the transfer point 22 may be adjusted appropriately.

結像点21から転写点22の間の角度θ1を変化させる
には、2つの方法がある。1つは、結像点21を変化さ
せる方法である。具体的な方法として、光学系ユニット
3そのものをカム等の揺動装置を使って変化させる例を
第6図に示す。光学系ユニット3は支点23を中心に揺
動でき、揺動カム24の変位により光学系ユニット3全
体の感光体1に対する角度を可変できるようになってい
る。また、光学系ユニット3はスプリング等の固定装置
25にて揺動カム24に接触した状態で固定されており
、光学系ユニット3全体が振動等でぶれないようになっ
ている。この場合注意しなければならないことは、光学
系ユニット3から放射される光ビームの結像点21の位
置が感光体1上で変わっても、その結像点のスポット経
が実質的に変化しないようにすることである。そのため
には例えば光学系ユニット3内で光路長を変化させ得る
機構を設けておけばよい。第6図に示すように結像点2
1から転写点22の間の角度θ1をΔθ、たけずらして
やると、(3)式の基本周波数に関係する角度はθlが
らθl−Δθ1に変化するので、基本周波数foは次式
で書き表されるf。′に変化する。
There are two methods for changing the angle θ1 between the imaging point 21 and the transfer point 22. One method is to change the imaging point 21. As a specific method, FIG. 6 shows an example in which the optical system unit 3 itself is changed using a swinging device such as a cam. The optical system unit 3 can swing around a fulcrum 23, and the angle of the entire optical system unit 3 with respect to the photoreceptor 1 can be varied by displacement of a swing cam 24. Further, the optical system unit 3 is fixed in contact with the swing cam 24 by a fixing device 25 such as a spring, so that the entire optical system unit 3 does not shake due to vibrations or the like. In this case, it must be noted that even if the position of the imaging point 21 of the light beam emitted from the optical system unit 3 changes on the photoreceptor 1, the spot diameter of the imaging point does not substantially change. It is to do so. For this purpose, for example, a mechanism that can change the optical path length may be provided within the optical system unit 3. As shown in Figure 6, the imaging point 2
When the angle θ1 between 1 and the transfer point 22 is shifted by Δθ, the angle related to the fundamental frequency in equation (3) changes from θl to θl−Δθ1, so the fundamental frequency fo can be written as the following equation. f. ′.

fo’= 1/lo’=((θl−Δθg)/”m)−
”=ωm/(θ1−Δす(7)このように感光体1上の
結像点21から転写点22の間の角度を変化させること
により基本周波数foを変化させ、感光体1の回転振動
周波数fあるいはf2との関係を整数比に近づけること
ができる。
fo'= 1/lo'=((θl−Δθg)/”m)−
”=ωm/(θ1−Δs(7) In this way, by changing the angle between the image forming point 21 and the transfer point 22 on the photoconductor 1, the fundamental frequency fo is changed, and the rotational vibration of the photoconductor 1 is The relationship with frequency f or f2 can be brought closer to an integer ratio.

第2の方法は転写点22を変化させる方法である。具体
的な方法としては、第4図において転写a8の位置を転
写ドラム50回転方向に対して変化させればよい。
The second method is to change the transfer point 22. A specific method is to change the position of the transfer a8 with respect to the rotation direction of the transfer drum 50 in FIG. 4.

第5図に示す感光体1の回転速度はロータリーエンコー
ダ等の装置で容易に測定ができるので、その測定値をF
Fr解析用マイクロコンピュータで処理し、感光体1の
回転振動周波数f1あるいはf2と基本周波数foの比
が常に整数になるように、第6図に示した揺動カム24
を自動的に制御してやればより効果的である。感光体1
上の結像点21から転写点22の間の角度を変化させる
方法は、結像点21の位置を変化させてもよいし、転写
点22の位置を変化させてもよいし、両方を変化させて
もよい。
The rotational speed of the photoreceptor 1 shown in FIG. 5 can be easily measured with a device such as a rotary encoder, so the measured value is
The oscillating cam 24 as shown in FIG.
It would be more effective if it were controlled automatically. Photoreceptor 1
The angle between the upper imaging point 21 and the transfer point 22 can be changed by changing the position of the imaging point 21 or the transfer point 22, or by changing both. You may let them.

本発明の転写位置調整方法を使ったカラー画像形成装置
の他の例を第7図に示す。転写ドラム3゜の回りには4
つの画像形成ユニットが配置されており、各画像形成ユ
ニットに対応して転写コロトロン(41,42,43,
44)が転写ドラム30の内部に配置されている。各画
像形成ユニットは、各感光体(51,52,52,54
)の回りに帯電器(61,62,63,64)、光学系
(71,72,73,74)、現像機(81,82,8
3,84)、クリーニング手段(91,92,93,9
4)が各々−組づつ配置され、各感光体上に各色に対応
した画像を周知の方法で形成する。各光学系ユニットは
半導体レーザ75、偏光器76、レンズ系77等からな
り、第6図に示したような角度調整機構(図示せず)が
設けられている。用紙100はフィードロール101に
よりレジスト調整ロール102まで搬送され、転写ドラ
ム30に設けられたグリッパ−にタイミングを合わせて
保持される。グリッパ−に保持された用紙は、転写ドラ
ム30に張り渡された用紙搬送媒体、例えば誘電体メツ
シュあるいはマイラー等の誘電体上に静電的に吸着され
搬送される。感光体(51,52,53,54)上に形
成された画像を転写コロトロン(41,42,43,4
4)で順次転写する。画像の転写が終了した用紙は剥離
爪104で剥離され、定着器105を通り排紙トレイ1
06に排出される。このような装置では、−度の用紙搬
送でフルカラーのプリントが得られるのでフルカラープ
リンターの高速化が図れる。さらに、本実施例の装置で
は転写位置の調整を自動的に行っているので、各色の転
写位置のずれがなく非常に良好なカラー画質が得られる
。もし、このような4色あるいは3色を重ねてカラー画
像を得る装置において、各画像形成ユニットで形成され
た各色の画像を、本発明のような特別な工夫をすること
なしに単純に重ね合わせると、各感光体の回転変動に伴
う位置ずれが各色の色ずれとなって現れる。ずなわち、
イエロー、マゼンタ、シアン、ブラック間での位置ずれ
(色ずれ)が発生し著しく画質レベルが低下する。
Another example of a color image forming apparatus using the transfer position adjustment method of the present invention is shown in FIG. 4 around the transfer drum 3°
Two image forming units are arranged, and transfer corotrons (41, 42, 43,
44) is arranged inside the transfer drum 30. Each image forming unit has each photoreceptor (51, 52, 52, 54
), charger (61, 62, 63, 64), optical system (71, 72, 73, 74), developing machine (81, 82, 8
3, 84), cleaning means (91, 92, 93, 9
4) are arranged in pairs, and an image corresponding to each color is formed on each photoreceptor by a well-known method. Each optical system unit includes a semiconductor laser 75, a polarizer 76, a lens system 77, etc., and is provided with an angle adjustment mechanism (not shown) as shown in FIG. The paper 100 is conveyed by a feed roll 101 to a registration adjustment roll 102, and is held by a gripper provided on a transfer drum 30 in a timed manner. The paper held by the gripper is electrostatically attracted to a paper transport medium stretched over the transfer drum 30, such as a dielectric material such as dielectric mesh or mylar, and is transported. The image formed on the photoreceptor (51, 52, 53, 54) is transferred to the corotron (41, 42, 43, 4).
4) Transfer sequentially. The paper on which the image has been transferred is peeled off by a peeling claw 104, passes through a fixing device 105, and is delivered to a paper output tray 1.
It will be discharged on 06. With such an apparatus, a full-color print can be obtained by transporting the paper at -degrees, so that the speed of a full-color printer can be increased. Furthermore, since the apparatus of this embodiment automatically adjusts the transfer position, there is no shift in the transfer position of each color, and very good color image quality can be obtained. If such a device obtains a color image by superimposing four colors or three colors, it would be possible to simply superimpose the images of each color formed by each image forming unit without making any special efforts as in the present invention. Then, positional deviations due to rotational fluctuations of each photoreceptor appear as color deviations of each color. Zunawachi,
Misregistration (color misregistration) occurs between yellow, magenta, cyan, and black, resulting in a significant drop in image quality.

本発明の画像形成位置調整法を用いて転写位置の調整を
行う場合、周波数fi、fQはその装置に固有な値を基
にしてあらかじめ調整してもよいし、画像形成装置自体
に周波数を測定、分析する装置および露光位置あるいは
転写位置調整手段を設け、画像形成時に自動調整を行っ
てもよい。自動調整を行う場合の構成例を第2図にブロ
ック図で示す。
When adjusting the transfer position using the image forming position adjustment method of the present invention, the frequencies fi and fQ may be adjusted in advance based on values specific to the device, or the frequencies may be measured in the image forming device itself. , an analysis device and an exposure position or transfer position adjusting means may be provided to perform automatic adjustment during image formation. FIG. 2 shows a block diagram of an example of the configuration when performing automatic adjustment.

[発明の効果] 本発明の画像形成位置調節方法によれば、複数の画像を
重ねて画像を形成する際に、感光体に多少の回転変動が
あっても各画像の位置がずれることなく重ね合わせるこ
とができる。また、本発明のように結像点あるいは転写
点を可変にした画像形成位置調整装置では、高精度なモ
ーターを用いることなく、画像形成位置を調整すること
ができる。さらに、結像点あるいは転写点を自動調整可
能にしたカラー画像形成装置では、色ずれのない高画質
なカラープリントが容易に得られるので、高速カラー画
像形成装置が安価に提供できる。
[Effects of the Invention] According to the image forming position adjusting method of the present invention, when forming images by overlapping a plurality of images, the positions of the images can be overlapped without shifting even if there is some rotational fluctuation in the photoreceptor. Can be matched. Further, in the image forming position adjusting device in which the image forming point or the transfer point is variable as in the present invention, the image forming position can be adjusted without using a highly accurate motor. Further, in a color image forming apparatus in which the image forming point or the transfer point can be automatically adjusted, high-quality color prints without color shift can be easily obtained, so that a high-speed color image forming apparatus can be provided at low cost.

【図面の簡単な説明】[Brief explanation of the drawing]

第1図は本発明の画像形成位置調整方法の原理を示す図
である。第2図は自動調整を行う場合のブロック図であ
る。第3図は本発明の画像形成位置調整方法を用いた画
像形成装置の概観を示す図である。第4図は転写部分の
詳細を示す図である。第5図は感光体の速度変動の様子
を示す一例である。第6図は結像点を変化させるための
一例を示す図である。第7図は本発明の画像形成位置調
整方法を用いた画像形成装置の他の例である。 1・・・感光体ドラム、2・・・帯電器、3・・・光学
系ユニット、4(C,M、Y、K)・・・現像機、5・
・・転写器、6・・・クリーニンク前処理ユニット、7
・・・クリーニングユニット、8・・・転写ドラム、9
・・・剥離除電器、10・・・剥離爪、11−・・カセ
ットトレイ、12・・・給紙ロール、13・・・レジス
トロール、14・・・定着器、15.・・排紙ロール、
16・・・排紙トレイ、エフ・・・用紙搬送媒体、18
・・・用紙、19・・・グリッパ−120・・・感光体
ドラムの中心、21・・・結像点、22・・・転写点、
30・・・転写ドラム、41.42,43.44・・・
転写コロトロン、51,52,53,54・・・感光体
、61,62,63,64・・・帯電器、71,72,
73,74・・・光学系、81,82,83,84・・
・現像機、91,92,93,94・・・クリーニング
手段、100・・・用紙、101・・・フィードローラ
、102・・ルジストローラ、103・・・ガイド板、
104・・・剥離爪、105・・・定着器、106・・
・排紙トレイ出願人 富士ゼロックス株式会社 代理人 弁理士  小1)富士雄 第3図 第4図 第1図 第2図 第5図 第6図
FIG. 1 is a diagram showing the principle of the image forming position adjusting method of the present invention. FIG. 2 is a block diagram when performing automatic adjustment. FIG. 3 is a diagram showing an overview of an image forming apparatus using the image forming position adjusting method of the present invention. FIG. 4 is a diagram showing details of the transferred portion. FIG. 5 is an example showing how the speed of the photoreceptor changes. FIG. 6 is a diagram showing an example of changing the imaging point. FIG. 7 shows another example of an image forming apparatus using the image forming position adjusting method of the present invention. DESCRIPTION OF SYMBOLS 1... Photosensitive drum, 2... Charger, 3... Optical system unit, 4 (C, M, Y, K)... Developing machine, 5...
...Transfer device, 6...Cleaning pre-processing unit, 7
...Cleaning unit, 8...Transfer drum, 9
... Peeling static eliminator, 10... Peeling claw, 11-... Cassette tray, 12... Paper feed roll, 13... Registration roll, 14... Fixing device, 15.・・Paper output roll,
16...Paper output tray, F...Paper transport medium, 18
...paper, 19...gripper 120...center of photoreceptor drum, 21...imaging point, 22...transfer point,
30... Transfer drum, 41.42, 43.44...
Transfer corotron, 51, 52, 53, 54... Photoreceptor, 61, 62, 63, 64... Charger, 71, 72,
73, 74... optical system, 81, 82, 83, 84...
- Developing machine, 91, 92, 93, 94...Cleaning means, 100...Paper, 101...Feed roller, 102...Luge roller, 103...Guide plate,
104... Peeling nail, 105... Fixing device, 106...
・Paper output tray Applicant Fuji Xerox Co., Ltd. Agent Patent attorney 1st grade) Fujio Figure 3 Figure 4 Figure 1 Figure 2 Figure 5 Figure 6

Claims (2)

【特許請求の範囲】[Claims] (1)搬送媒体で運ばれた転写媒体に感光体上の画像を
転写出力する画像形成出力装置において、感光体の角速
度変動に含まれる振動周波数をf_iとし、前記感光体
上の結像点をA、転写点をB、前記感光体の中心をOと
し、角AOBのなす角度および前記感光体の平均角速度
に依存する基本周波数をf_0とした場合、f_i/f
_0が整数であることを特徴とする画像形成位置調整方
法。
(1) In an image forming output device that transfers and outputs an image on a photoreceptor to a transfer medium carried by a conveyance medium, the vibration frequency included in the angular velocity fluctuation of the photoreceptor is f_i, and the image forming point on the photoreceptor is A, the transfer point is B, the center of the photoreceptor is O, and the fundamental frequency that depends on the angle formed by the angle AOB and the average angular velocity of the photoreceptor is f_0, then f_i/f
An image forming position adjustment method characterized in that _0 is an integer.
(2)搬送媒体で運ばれた転写媒体に感光体上の画像を
転写出力する画像形成出力装置において、前記感光体上
の結像点と転写点のうち少なくとも一方の位置を可変に
し、感光体の角速度変動に含まれる振動周波数をf_i
とし、前記感光体上の前記結像点をA、前記転写点をB
、前記感光体の中心をOとし、角AOBのなす角度およ
び該感光体の平均角速度に依存する基本周波数をf_0
とし、f_i/f_0が整数になるように、前記角AO
Bのなす角度を変えるための角度調整手段を設けたこと
を特徴とする画像形成位置調整装置。
(2) In an image forming output device that transfers and outputs an image on a photoconductor to a transfer medium carried by a conveying medium, the position of at least one of an image forming point and a transfer point on the photoconductor is made variable, and the photoconductor Let f_i be the vibration frequency included in the angular velocity fluctuation of
The image forming point on the photoreceptor is A, and the transfer point is B.
, the center of the photoreceptor is O, and the fundamental frequency that depends on the angle formed by the angle AOB and the average angular velocity of the photoreceptor is f_0
and the angle AO is set such that f_i/f_0 is an integer.
An image forming position adjusting device characterized in that an angle adjusting means for changing the angle formed by B is provided.
JP2165940A 1990-06-25 1990-06-25 Image forming position adjusting method and apparatus Expired - Fee Related JP2929671B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2165940A JP2929671B2 (en) 1990-06-25 1990-06-25 Image forming position adjusting method and apparatus

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2165940A JP2929671B2 (en) 1990-06-25 1990-06-25 Image forming position adjusting method and apparatus

Publications (2)

Publication Number Publication Date
JPH0454613A true JPH0454613A (en) 1992-02-21
JP2929671B2 JP2929671B2 (en) 1999-08-03

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ID=15821908

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2165940A Expired - Fee Related JP2929671B2 (en) 1990-06-25 1990-06-25 Image forming position adjusting method and apparatus

Country Status (1)

Country Link
JP (1) JP2929671B2 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1324148A1 (en) * 2001-12-28 2003-07-02 Ricoh Company, Ltd. Driving device and image forming apparatus including the same
JP2010152278A (en) * 2008-12-26 2010-07-08 Seiko Epson Corp Method for controlling latent image forming position, image forming method and image forming apparatus

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE60321501D1 (en) 2002-03-14 2008-07-24 Ricoh Kk Color image forming apparatus with avoidance of speed-related pixel size changes

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1324148A1 (en) * 2001-12-28 2003-07-02 Ricoh Company, Ltd. Driving device and image forming apparatus including the same
US6889022B2 (en) 2001-12-28 2005-05-03 Ricoh Company, Ltd. Rotationally phase-matched driving device and image forming apparatus including the same
JP2010152278A (en) * 2008-12-26 2010-07-08 Seiko Epson Corp Method for controlling latent image forming position, image forming method and image forming apparatus

Also Published As

Publication number Publication date
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