JP2563167B2 - Print density correction method - Google Patents
Print density correction methodInfo
- Publication number
- JP2563167B2 JP2563167B2 JP61292449A JP29244986A JP2563167B2 JP 2563167 B2 JP2563167 B2 JP 2563167B2 JP 61292449 A JP61292449 A JP 61292449A JP 29244986 A JP29244986 A JP 29244986A JP 2563167 B2 JP2563167 B2 JP 2563167B2
- Authority
- JP
- Japan
- Prior art keywords
- density
- printing
- correction
- measured
- print density
- 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 - Fee Related
Links
Landscapes
- Inking, Control Or Cleaning Of Printing Machines (AREA)
Description
【発明の詳細な説明】 〔産業上の利用分野〕 本発明は、印刷機による印刷面の印刷濃度を修正する
方法に関するものである。Description: TECHNICAL FIELD The present invention relates to a method for correcting the print density of a printing surface by a printing machine.
印刷面の印刷濃度は、刷版面に対するインキ供給量お
よび湿し水の供給量に応じて変化し、インキ供給量は、
インキ壺のインキ送りローラ回転数、および、これと対
向しかつ同ローラの軸方向へ分割されたブレードの同ロ
ーラに対する開量に応じて加減され、湿し水の供給量
は、水供給ローラの回転数に応じて加減されるものとな
つており、多色印刷の場合、各色毎に設けた印刷ユニッ
ト毎にこれらが備えてあり、これらが各々印刷濃度の可
変要素となつている。The printing density of the printing surface changes depending on the ink supply amount and dampening water supply amount to the printing plate surface.
The supply amount of dampening water is adjusted according to the number of revolutions of the ink feed roller of the ink fountain and the opening amount of the blade opposed to this and divided in the axial direction of the roller to the same roller. It is adjusted according to the number of rotations, and in the case of multicolor printing, these are provided for each printing unit provided for each color, and these are variable elements of the print density.
したがつて、これらの印刷濃度可変要素を制御し、印
刷濃度を最適な基準濃度とする目的上、印刷中に抽出し
た印刷面の印刷濃度を光電的に測定し、基準濃度Dsと実
測濃度Dとの差(Ds−D)より修正値Cを求め、この求
めた修正値Cにしたがい各印刷濃度可変要素を制御し、
印刷濃度の修正を行なう方法が近来は用いられている。Therefore, for the purpose of controlling these print density variable elements and making the print density the optimum reference density, the print density of the printing surface extracted during printing is measured photoelectrically, and the reference density D s and the actual density are measured. The correction value C is obtained from the difference (D s −D) from D, and each print density variable element is controlled according to the obtained correction value C,
Recently, a method of correcting print density has been used.
たゞし、修正値を定める際に用いる係数としては、実
験的に求めた係数をほゞ固定的に用いるものとなつてい
る。However, as the coefficient used when determining the correction value, the coefficient obtained experimentally is almost fixed.
しかし、実際の印刷条件は、温度、湿度、印刷機の種
別、印刷用紙、インキの質等に応じて多様に変化し、特
に季節の推移にしたがつて長期的な変動を生じており、
実験的に求めた係数のみによつては適切な修正がなされ
ず、修正状況の過大または過小により修正制御が直ちに
安定せず、この間に大量の不良印刷が生じ、不経済とな
る問題を招来している。However, the actual printing conditions vary variously depending on the temperature, humidity, type of printing machine, printing paper, ink quality, etc., and in particular, there are long-term fluctuations due to seasonal changes.
Appropriate correction cannot be made only by the coefficient obtained experimentally, and the correction control is not stable immediately due to excessive or small correction situation, and a large amount of defective printing occurs during this period, resulting in an uneconomical problem. ing.
前述の問題を解決するため、本発明はつぎの手段によ
り構成するものとなつている。In order to solve the above-mentioned problem, the present invention is constituted by the following means.
すなわち、印刷面の印刷濃度を測定し、基準濃度Dsと
実測濃度Dとの差(Ds−D)より修正値Cを求め、この
求めた修正値Cにしたがって印刷機のインキ供給量を制
御し、印刷濃度を修正する方法において、基準濃度Dsと
前回の実測濃度Di-1との差A=(Ds−Di-1)を今回の実
測濃度Diとの前回の実測濃度Di-1との差B=(Di−
Di-1)で除して比率α=A/Bを求め、基準濃度Dsと今回
の実測濃度Diとの差Ei=(Ds−Di)および比率αより今
回の修正値Ciを求め、この求めた修正値Ciにしたがって
インキ供給量の制御を行なうものとしている。That is, the print density of the printing surface is measured, the correction value C is obtained from the difference (D s −D) between the reference density D s and the actually measured density D, and the ink supply amount of the printing machine is calculated according to the obtained correction value C. In the method of controlling and correcting the print density, the difference A = (D s −D i-1 ) between the reference density D s and the previously measured density D i-1 is measured by the previous measurement with the current measured density D i. Difference from density D i-1 B = (D i −
D i-1 ) to obtain the ratio α = A / B, and the difference E i = (D s −D i ) between the reference concentration D s and the actually measured concentration D i at this time and the corrected value at this time from the ratio α. C i is obtained, and the ink supply amount is controlled according to the obtained correction value C i .
したがつて、最新の印刷条件に応じた比率により修正
値が補正され、修正状況に過不足を生ぜず、修正制御が
直ちに安定となる。Therefore, the correction value is corrected by the ratio according to the latest printing condition, the correction situation is not excessive or insufficient, and the correction control becomes stable immediately.
以下、実施例を示す図によつて本発明の詳細を説明す
る。Hereinafter, the details of the present invention will be described with reference to the drawings illustrating examples.
第2図は、構成を示すブロツク図であり、基準印刷状
態の基準紙1を濃度計(以下、DM)2により光電的に測
定し、基準紙1の上辺余白等へ印刷されているカラーパ
ツチと称する各色毎の小方形印刷面に基づき、各色毎の
基準印刷濃度を求めたうえ、印刷中に抽出したサンプル
紙3も同様にDM2により測定し、現在の印刷濃度を各色
毎に求めるものとなつている。FIG. 2 is a block diagram showing the structure, in which the reference paper 1 in the reference printing state is photoelectrically measured by a densitometer (hereinafter, DM) 2 and a color patch printed on the upper margin of the reference paper 1 and the like. The standard print density for each color is calculated based on the square print surface for each color, and the sample paper 3 extracted during printing is also measured by DM2 in the same way, and the current print density is calculated for each color. ing.
一方、DM2の出力が与えられる制御回路(以下、CNT)
4は、マイクロプロセツサ等のプロセツサ(以下、CP
U)41を始めとし、固定メモリ(以下、ROM)および可変
メモリ(以下、RAM)からなるメモリ(以下、MEM)42、
インターフェイス(以下、I/F)43、44、キーボードお
よび表示器からなる入出力装置(以下、IOE)45により
構成されており、CPU41がMEM42中のROMへ格納されてい
る命令を実行し、必要とするデータをMEM42のRAMへアク
セスしながら制御動作を行ない、IOE45からの設定デー
タおよびI/F43を介するDM2の測定出力に応じて制御上の
判断結果を求め、これに基づく制御信号をI/F44を介し
て印刷機5へ送出し、各色毎の印刷濃度可変要素を制御
するものとなつている。On the other hand, a control circuit that receives the output of DM2 (hereafter CNT)
4 is a processor such as a microprocessor (hereinafter, CP
U) 41, fixed memory (hereinafter ROM) and variable memory (hereinafter RAM) memory (hereinafter MEM) 42,
It is composed of interfaces (hereinafter I / F) 43 and 44, an input / output device (hereinafter referred to as IOE) 45 consisting of a keyboard and a display, and CPU 41 executes the instructions stored in the ROM of MEM 42 and is required. The control operation is performed while accessing the RAM of MEM42, and the control judgment result is obtained according to the setting data from IOE45 and the measurement output of DM2 via I / F43. It is sent to the printing press 5 via F44 to control the print density variable element for each color.
第1図は、前述の制御による印刷濃度Dの修正状況を
示す図であり、基準濃度Dsに対するサンプル紙3の実測
濃度Di-1、Diは、これの抽出およびDM2による測定回数
mに応じて変化すると共に、修正状況に不足を生じてお
り、こゝにおいて、基準濃度Dsと前回の実測濃度Di-1と
の差をA=(Ds−Di-1)とし、これに基づく修正後に求
めた今回の実測濃度Diと前回の実測濃度Di-1との差をB
=(Di−Di-1)とし、かつ、Aに対して係数fを乗じた
ものを前回の修正値とし、これに過不足を生じないため
の補正を行なう比率をαとすれば、次式の関係が成立す
る。FIG. 1 is a diagram showing the correction status of the print density D by the above-mentioned control. The actually measured densities D i-1 and D i of the sample paper 3 with respect to the reference density D s are the number of times m of extraction and measurement by DM2. And the correction status is insufficient, and the difference between the reference concentration D s and the previously measured concentration D i-1 is A = (D s −D i-1 ). The difference between the measured density D i of this time obtained after correction based on this and the measured density D i-1 of the previous time is B
= (D i −D i−1 ), and A is multiplied by a coefficient f to be the previous correction value, and α is a ratio for performing correction to prevent excess or deficiency. The following relationship holds.
このため、比率αに応じて今回の修正値を補正し、こ
の補正した修正値により印刷濃度の修正を行なえばよ
く、基準濃度Dsと今回の実測濃度Diとの差をEi=(Ds−
Di)とし、今回の補正した修正値をCiとすれば、次式に
よつて与えられる。 Therefore, the correction value of this time may be corrected according to the ratio α, and the print density may be corrected by the corrected value, and the difference between the reference density D s and the actually measured density D i of this time may be E i = ( D s −
D i ), and the corrected value corrected this time is C i , it is given by the following equation.
なお、測定回数mの反復に応じ、αを移動平均として
求め、これの最新値を用いればよく、同一色において各
ブレード毎の修正値が異なるときは、これらの中央値等
を用いればよい。 It should be noted that α is calculated as a moving average in accordance with the repetition of the number of times of measurement m, and the latest value thereof may be used. If the correction value for each blade is different for the same color, these median values may be used.
したがつて、CPU41がDs、Di-1、Di等の各データをMEM
42へ逐次格納しておき、(3)式の演算により補正した
修正値Ciを逐次求め、これに応じて印刷機5を制御する
ことにより、印刷濃度の修正が過不足なく即応して行な
われ、修正制御状況の応答性が向上し、不良印刷の発生
量が大幅に減少する。Therefore, the CPU 41 memorizes each data such as D s , D i-1 , D i, etc.
The correction values C i corrected by the calculation of the equation (3) are sequentially stored in 42, and the printing machine 5 is controlled in accordance with the correction values C i , so that the correction of the printing density can be performed promptly without excess or deficiency. As a result, the responsiveness of the correction control status is improved, and the amount of defective printing is significantly reduced.
たゞし、第1図の構成は状況に応じた選定が任意であ
る、各種の構成に対して本発明を適用することが自在で
ある。However, the configuration of FIG. 1 can be freely applied to various configurations in which selection according to the situation is arbitrary.
以上の説明により明らかなとおり本発明によれば、実
際の印刷条件に応じた比率を用いる修正値の補正によ
り、印刷濃度の修正状況が最適となり、修正制御の応答
性向上により不良印刷の発生量が大幅に減少するため、
各種印刷機の印刷濃度修正において顕著な効果が得られ
る。As is clear from the above description, according to the present invention, the correction value correction using the ratio according to the actual printing condition optimizes the correction status of the print density, and the improvement in the responsiveness of the correction control results in the occurrence amount of defective printing. Is significantly reduced,
A remarkable effect can be obtained in correction of print density of various printing machines.
図は本発明の実施例を示し、第1図は修正状況を示す
図、第2図は構成を示すブロツク図である。 1……基準紙、2……DM(濃度計)、3……サンプル
紙、4……制御回路、5……印刷機、41……CPU(プロ
セツサ)、42……MEM(メモリ)、Ds……基準濃度、D
i-1、Di……実測濃度。FIG. 1 shows an embodiment of the present invention, FIG. 1 is a diagram showing a correction situation, and FIG. 2 is a block diagram showing a configuration. 1 ... reference paper, 2 ... DM (densitometer), 3 ... sample paper, 4 ... control circuit, 5 ... printing machine, 41 ... CPU (processor), 42 ... MEM (memory), D s …… Standard density, D
i-1 , D i ... Measured concentration.
Claims (1)
実測濃度Dとの差(Ds−D)より修正値Cを求め、この
求めた修正値Cにしたがって印刷機のインキ供給量を制
御し、前記印刷濃度を修正する方法において、 前記基準濃度Dsと前回の実測濃度Di-1との差A=(Ds−
Di-1)を今回の実測濃度Diと前記前回の実測濃度Di-1と
の差B=(Di−Di-1)で除して比率α=A/Bを求め、前
記基準濃度Dsと今回の実測濃度Diとの差Ei=(Ds−Di)
および前記比率αより今回の修正値Ciを求め、この求め
た修正値Ciにしたがって前記インキ供給量の制御を行な
うことを特徴とした印刷濃度修正方法。1. A printing density of a printing surface is measured, a correction value C is obtained from a difference (D s -D) between a reference density D s and an actually measured density D, and an ink of a printing machine is printed according to the obtained correction value C. In the method of controlling the supply amount and correcting the print density, the difference A = (D s −) between the reference density D s and the previously measured density D i−1.
D i-1 ) is divided by the difference B = (D i −D i-1 ) between the measured density D i of this time and the measured density D i-1 of the previous time to obtain the ratio α = A / B. Difference between the reference density D s and the actually measured density D i this time E i = (D s −D i ).
And a correction value C i of this time is calculated from the ratio α, and the ink density is controlled according to the calculated correction value C i .
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP61292449A JP2563167B2 (en) | 1986-12-10 | 1986-12-10 | Print density correction method |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP61292449A JP2563167B2 (en) | 1986-12-10 | 1986-12-10 | Print density correction method |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS63145035A JPS63145035A (en) | 1988-06-17 |
JP2563167B2 true JP2563167B2 (en) | 1996-12-11 |
Family
ID=17781942
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP61292449A Expired - Fee Related JP2563167B2 (en) | 1986-12-10 | 1986-12-10 | Print density correction method |
Country Status (1)
Country | Link |
---|---|
JP (1) | JP2563167B2 (en) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE10013876B4 (en) * | 1999-04-08 | 2013-10-02 | Heidelberger Druckmaschinen Ag | Method for controlling the coloring when printing with a printing machine |
JP2007283496A (en) * | 2006-04-12 | 2007-11-01 | Mitsubishi Heavy Ind Ltd | Pattern color tone controlling method and device of printing machine |
Family Cites Families (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS60220411A (en) * | 1984-04-17 | 1985-11-05 | Toshiba Corp | Digital position controller |
DE3438325A1 (en) * | 1984-10-19 | 1986-04-24 | Miller-Johannisberg Druckmaschinen Gmbh, 6200 Wiesbaden | MULTICOLOR SHEET PRINTING MACHINE FOR SHEET PRINTING, SHEET PRINTING AND REPRINTING WITH AT LEAST ONE BETWEEN TWO PRINTING ARCH TURNING DEVICES |
-
1986
- 1986-12-10 JP JP61292449A patent/JP2563167B2/en not_active Expired - Fee Related
Also Published As
Publication number | Publication date |
---|---|
JPS63145035A (en) | 1988-06-17 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
LAPS | Cancellation because of no payment of annual fees |