DE19516353A1 - Process for controlling or regulating the coloring during a printing process - Google Patents

Process for controlling or regulating the coloring during a printing process

Info

Publication number
DE19516353A1
DE19516353A1 DE1995116353 DE19516353A DE19516353A1 DE 19516353 A1 DE19516353 A1 DE 19516353A1 DE 1995116353 DE1995116353 DE 1995116353 DE 19516353 A DE19516353 A DE 19516353A DE 19516353 A1 DE19516353 A1 DE 19516353A1
Authority
DE
Germany
Prior art keywords
tolerance
control
regulating
estimate
coloring
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.)
Withdrawn
Application number
DE1995116353
Other languages
German (de)
Inventor
Werner Dr Huber
Bernd Kistler
Wolfgang Geisler
Harald Bucher
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.)
Heidelberger Druckmaschinen AG
Original Assignee
Heidelberger Druckmaschinen AG
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 Heidelberger Druckmaschinen AG filed Critical Heidelberger Druckmaschinen AG
Priority to DE1995116353 priority Critical patent/DE19516353A1/en
Publication of DE19516353A1 publication Critical patent/DE19516353A1/en
Withdrawn legal-status Critical Current

Links

Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B41PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41FPRINTING MACHINES OR PRESSES
    • B41F33/00Indicating, counting, warning, control or safety devices
    • B41F33/0036Devices for scanning or checking the printed matter for quality control
    • B41F33/0045Devices for scanning or checking the printed matter for quality control for automatically regulating the ink supply

Description

The invention relates to a method for controlling or regulating the coloring during the printing process, in particular during the production process, a printing press, where Color measurement data obtained from the continuously created print images and for the control or regulating process to influence the Coloring can be used when a predetermined tolerance is exceeded.

From European patent specification 0 196 431 it is known use sizes to control the desired color balance, which are determined in that ink layer thicknesses and / or Halftone dot sizes of different printing inks to each other in Relationship. The sizes fall out of them assigned tolerance ranges, it is corrective intervened in the printing process.

The invention has for its object a method for Controls or rules of coloring to create one simple and reliable activation of the color control or color control and coloring reached their setpoint as quickly as possible.

This object is achieved in that during or after the control or regulating process (s) is estimated what future color value represents an estimated value the color scheme appears as a new, stable condition and that the control or regulating process is activated or is continued if the estimated value does not fall within the Tolerance lies. First of all, it should be noted that  the idea of the invention is only based on a one-dimensional example is explained, that is, there is only one measuring field the respective print images created in the production process considered and only one within this measuring field Measured variable, i.e. the determination of color measurement data on one only place, this color measurement data even only one are assigned to a single ink. However, the invention is not limited to this one-dimensional design, but of course several measuring fields can be used several measuring locations and per measuring location also with several Color measurement data are considered. The simplicity, however in the following only on what is referred to as one-dimensional Example received. In the solution according to the invention provided that the question of whether the control or regulation process continued after activation of the control or regulation or resume, depending on what future color value turns out to be a new stable state will set. "Stable" means a state that would be retained if no new tax or control processes follow and no disturbances Process would affect. Estimates that the newly established stable state is not within the predetermined tolerance, the control or Control process activated accordingly or continued to turn based on an estimate determine whether the due to the renewed tax or Control process now stable state in the future (Estimate) is within tolerance and so on. The Estimation is preferably carried out using a calculation with which an estimation curve is found. In control processes it is often an exponential function, which strives for a certain value, the new stable Condition. This value is compared to the predetermined tolerance.  

The tolerance is preferably from a setpoint tolerance band lying around. This means that the The target value of the coloring is within the tolerance band with a positive and a negative tolerance zone around the There setpoint around, according to the control or Control process is carried out again or continued, if the estimate is above the upper tolerance limit or below the lower tolerance limit.

It is advantageous when considering the estimate those influenced by previous control or regulation, Color measurement data determined continuously. Is the tax or control process, the development of the actual color measurement data recorded and taken into account. The Detection is preferably carried out optically working detection device that the measurement site preferably every print image online in the production process determined so that currently determined color measurement data are available, which are used as a basis for the estimate to be carried out.

In particular, it is provided that the tolerance is static Tolerance is and that the regulation or control is activated or continues if the estimate is out of range the setpoint plus or minus the static Tolerance lies.

In addition to carrying out tax or Control processes in the event of failure to comply with the static Tolerance it is also possible that the regulation or Control is activated or continued if a Trend estimate of the future development of the color value returns default values within one in the future Lying over or undercut the specified time period will. This trend estimate is the forecast Development of the color value under consideration, the current, actually determined color measurement data as  Baseline values are used to estimate the trend, for example in non-linear or linear form perform. With a linear trend estimate first a straight line is formed, which is the actually measured Color measurement data approximated within a certain period of time is. This straight line then for future development extended. If the extended straight line crosses one Default value (or falls below one Default value in the event of a deviation downwards from the setpoint), see above there is a control or regulation process when the time of Exceeding is within a predetermined period of time.

In particular, it is provided that the default values (above and below) and the time span from a dynamic tolerance result which - as well as the static tolerance generated automatically, for example by means of a computer becomes as soon as the operator of the printing press Enter basic tolerance. The basic tolerance thus forms the Starting point for static and dynamic tolerance, the last two automatically according to certain specifications and calculated taking process dynamics into account will.

The inventive method for controlling or regulating Coloring during the printing process, especially during the printing process of a printing press is shown below explained in more detail with reference to the figures and shows:

Fig. 1 is a diagram of the measured values as a function of time,

Fig. 2 shows another diagram and

Fig. 3 is a flow chart.

It is assumed that in online operation of the printing press, at least one measuring point on the printing sheet is monitored by means of an optical device. As a result, color measurement data continuously arise in the production printing process, which permit a statement as to whether the coloring is stable or drifts. It is assumed that a control device has been activated due to a correspondingly large deviation of the color measurement data from a target value, which has acted on the coloring of the printing press, and that this effect to the time course of the color measurement data apparent from FIG. 1 in the period t 1 M has led. The values of these color measurement data lie outside a tolerance (which will be discussed in more detail below), which means that the control process is reactivated or continued, with the result that - according to the time period t₂ - the color measurement data decrease in their values ( Exponential function curve). The point in time marked with T₀ on the time axis t is intended to indicate the current point in time when the method is carried out, that is, points of time to the right of it are in the future, while points of time to the left of it belong to the past. On the basis of the color measurement data M present in the region t 2 as a result of the preceding control process, an estimate is possible, which is preferably carried out by means of computer calculation. This leads to an estimation curve K which, in accordance with its dynamics, strives for a new, stable state Z. This new, stable state Z thus forms an estimated value Sch of the future stable color value. In the exemplary embodiment in FIG. 1, it can be seen that the estimated value Sch is relatively close to the target value S, although there is a slight upward deviation.

A tolerance is formed around the setpoint S, which is marked by a tolerance band, that is, it is a tolerance deviation up and down with respect to  a setpoint S possible. With + σ₁ or -σ₁ is - in connection with one in the following described tolerance period and one Collision time - a dynamic tolerance and with + σ₂ or -σ₂ denotes a static tolerance, the width of the dynamic tolerance +/- σ₁ greater than the width of the static tolerance is +/- σ₂.

It is preferably provided that the static and the dynamic tolerance automatically by a computer Printing press is calculated as soon as the operator receives a Enters basic tolerance in the calculator. The calculator determines then from the basic tolerance, taking into account process-specific properties and dynamic Characteristics of the press, the dynamic tolerance and the static tolerance. The latter two tolerances are then the further procedure for controlling or regulating the color scheme.

In the method of regulating the coloring of the production process - according to Fig. 1- it is provided that the regulation is continued or activated again after a regulating process if the estimated value Sch is outside the static tolerance (+ σ₂, -σ₂). If it is determined in the forecast that the new, stable state that will arise in the future is not within the tolerance mentioned, the control process is carried out again in a corresponding manner and, based on the new color measurement data that then results, it is again determined whether an estimate can be expected is that the then-estimated value is within the static tolerance and so on.

In addition to the above procedure, a further control intervention according to FIG. 2 is provided. Color measurement data M which lead to the curve shown have been determined in the area to the left of the time T O (now). In the period t₃ there is a certain increasing tendency of the color measurement data M, whereby they move away from the target value S. Within the period t₃, the development of the color measurement data M can be approximated using a straight line g. If this straight line is extended for future points in time (to the right of T O ) (extension V), then this extension V intersects the dynamic tolerance limit + σ₁ at time T ′ K. With T ′ K the time of collision is referred to as the result of the trend estimate. A period T T is automatically derived from the dynamic tolerance +/- σ 1 by means of the computer, which forms a tolerance period (time between T O and T T ). If the collision point T ' K now lies within the tolerance period T T , a control process is initiated. The collision time T ' K defines a collision period T K (time between T O and T K ), so that T K <T T for the above case.

In the example of FIG. 2, the collision time T ' K lies outside the time period T T (T K <T T ), which means that no regulation has to be carried out.

Overall, a control process is therefore carried out if one of the two tolerances, namely the dynamic tolerance or the static tolerance is not adhered to.

The principle according to the invention is therefore based on the fact that during the standard time the later, stable state is estimated, and that at a Exceeding a predetermined deviation between A control process is initiated again for the estimated value and the target value becomes. If the estimated value is within the specified one Tolerance, it is monitored whether this condition is maintained becomes. As long as this state exists, the corresponding one Measuring position marked as in the coloring. Because of that two different trend estimates - like  described above - is therefore a Litigation depending on different Trend estimates given.

In FIG. 3, the procedure according to the invention with reference to FIG. 1 is again illustrated using a flow chart. In step 1, an estimate is made to determine the future stable state of the color value (estimated value). In step 2 it is checked whether the estimated value is within the static tolerance. A new regulation is then carried out in step 3 if the estimated value lies outside the tolerance limits of the static tolerance. Step 1 then follows again and so on. This process continues until the estimated value is within the dynamic tolerance.

A rule applies when the static tolerance is exceeded, regardless of Behavior of dynamic tolerance, or dynamic Tolerance is exceeded / undershot, regardless of the static tolerance, and the system exits the Setpoint is not yet in control.

Furthermore, regulation starts when the system is in Regulation is in place and reaching the static tolerance according to dynamic non-linear estimation. Starting the Setpoint is not likely.

Reference list

t 1 period
M color measurement data
t₂, t₃ period, range
t timeline
T O time
K estimation curve
Z condition
S setpoint
-₁, + ₁1 dynamic tolerance
-₂, + ₂ static tolerance 2
g Straight
T K time
T T time span
Sch estimate

Claims (6)

1. A method for controlling or regulating the coloring during the printing process (in particular during the continuous printing process of a printing press), wherein color measurement data are obtained from the continuously produced printed images and used for the control or regulating process for influencing the coloring if a predetermined tolerance is exceeded, characterized in that during or after the control or regulating process (s) an estimate is made on which future color value representing an estimated value (Sch) the coloring will appear as a new, stable state and that the control or regulating process will be activated or is continued if the estimated value (Sch) is not within the tolerance.
2. The method according to claim 1, characterized, that the tolerance of one around a set point tolerance band lying around is formed.
3. The method according to any one of the preceding claims, characterized, that the estimate taking into account the by previous control or regulation influenced, Color measurement data determined continuously.
4. The method according to any one of the preceding claims, characterized, that the tolerance is a static tolerance and that the Regulation or control activated or continued if the estimated value (Sch) is not in the range of  Setpoint plus or minus the static Tolerance lies.
5. The method according to any one of the preceding claims, characterized, that the regulation or control is activated or is continued if a trend estimate of the future development of the color value shows that Default values within a future predefined time span can be exceeded or fallen short of.
6. The method according to any one of the preceding claims, characterized, that the default values and the time period of a dynamic Belonging to tolerance.
DE1995116353 1995-05-04 1995-05-04 Process for controlling or regulating the coloring during a printing process Withdrawn DE19516353A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE1995116353 DE19516353A1 (en) 1995-05-04 1995-05-04 Process for controlling or regulating the coloring during a printing process

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE1995116353 DE19516353A1 (en) 1995-05-04 1995-05-04 Process for controlling or regulating the coloring during a printing process
EP96105191A EP0741030A3 (en) 1995-05-04 1996-04-01 Method for controlling or regulating the inking during a printing process

Publications (1)

Publication Number Publication Date
DE19516353A1 true DE19516353A1 (en) 1996-11-07

Family

ID=7761055

Family Applications (1)

Application Number Title Priority Date Filing Date
DE1995116353 Withdrawn DE19516353A1 (en) 1995-05-04 1995-05-04 Process for controlling or regulating the coloring during a printing process

Country Status (2)

Country Link
EP (1) EP0741030A3 (en)
DE (1) DE19516353A1 (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6450097B1 (en) 1999-04-08 2002-09-17 Heidelberger Druckmaschinen Ag Method of regulating inking when printing with a printing machine
DE102007011689B4 (en) * 2006-03-27 2016-04-28 Heidelberger Druckmaschinen Ag Optimized color control intervention in printing presses
DE102017115145A1 (en) * 2017-07-06 2019-01-10 Manroland Goss Web Systems Gmbh Method and control device for operating a printing press

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DD200665A1 (en) * 1981-07-28 1983-06-01 Wolfgang Arnold Process for adjusting the color dosing of printing machines
DE3220360A1 (en) * 1982-05-29 1983-12-01 Heidelberger Druckmasch Ag Device for influencing coloring on printing machines
DE3687074D1 (en) * 1985-03-21 1992-12-17 Felix Brunner Method, control device and auxiliary to achieve a uniform print result on an autotypical multicolor offset printing machine.
US5167010A (en) * 1989-08-03 1992-11-24 Westinghouse Electric Corp. Expert advice display processing system

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6450097B1 (en) 1999-04-08 2002-09-17 Heidelberger Druckmaschinen Ag Method of regulating inking when printing with a printing machine
DE10013876B4 (en) * 1999-04-08 2013-10-02 Heidelberger Druckmaschinen Ag Method for controlling the coloring when printing with a printing machine
DE102007011689B4 (en) * 2006-03-27 2016-04-28 Heidelberger Druckmaschinen Ag Optimized color control intervention in printing presses
DE102017115145A1 (en) * 2017-07-06 2019-01-10 Manroland Goss Web Systems Gmbh Method and control device for operating a printing press

Also Published As

Publication number Publication date
EP0741030A2 (en) 1996-11-06
EP0741030A3 (en) 1997-03-19

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