EP0386489A2 - Méthode de réglage d'humidité dans une imprimerie offset - Google Patents

Méthode de réglage d'humidité dans une imprimerie offset Download PDF

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Publication number
EP0386489A2
EP0386489A2 EP90102549A EP90102549A EP0386489A2 EP 0386489 A2 EP0386489 A2 EP 0386489A2 EP 90102549 A EP90102549 A EP 90102549A EP 90102549 A EP90102549 A EP 90102549A EP 0386489 A2 EP0386489 A2 EP 0386489A2
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EP
European Patent Office
Prior art keywords
control
actual value
setpoint
particular according
dampening solution
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
EP90102549A
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German (de)
English (en)
Other versions
EP0386489A3 (fr
EP0386489B1 (fr
Inventor
Helmut Kipphan
Josef Haase
Werner Joss
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
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Publication date
Application filed by Heidelberger Druckmaschinen AG filed Critical Heidelberger Druckmaschinen AG
Publication of EP0386489A2 publication Critical patent/EP0386489A2/fr
Publication of EP0386489A3 publication Critical patent/EP0386489A3/fr
Application granted granted Critical
Publication of EP0386489B1 publication Critical patent/EP0386489B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F33/00—Indicating, counting, warning, control or safety devices
    • B41F33/0054—Devices for controlling dampening

Definitions

  • the invention relates to a method for regulating the amount of dampening solution or dampening layer thickness on the printing plate of an offset printing press, the amount of dampening solution on the printing plate being detected and regulated to a predetermined desired value by adjusting the dampening roller speed and / or the like.
  • the quality of the print depends crucially on the dampening solution supply.
  • the problem here is to adapt the amount of dampening solution to the changing production conditions.
  • the amount of dampening solution has a very high influence on the dot gain, so that its optimal setting, which corresponds to the respective operating state, is of great importance.
  • a dampening solution control method in offset printing is known, in which the amount of dampening solution on the printing plate is detected and regulated to a predetermined target value by adjusting the dampening roller speed.
  • the nominal value for the moisture is taken from an empirically determined nominal value table which is based on empirical values for various plate-paper combinations, in particular from previously printed editions. This known control method is not yet optimal with regard to the process control and the work result.
  • the invention is therefore based on the object of specifying a method of the type mentioned at the outset which leads to excellent control behavior, in particular to optimal speed without instability problems.
  • the amount of dampening solution should be kept largely constant even when attacking strong disturbances.
  • the method according to the invention makes it possible to select the setpoint value for the amount of dampening solution relatively close to the so-called lubrication limit.
  • the smear limit is the state of a dampening solution quantity, at which just ink-free areas of the printing plate begin to take on color, which leads to the production of waste. Despite the setpoint adjustment close to the lubrication limit, no undesired state is approached due to the control method according to the invention.
  • control according to the invention enables the setpoint to be set to a setpoint which is favorable for the print quality, and at the same time the control becomes critical in critical areas faster reaction and yet driven in such a way that stable states are established which, due to the smaller gain factor (basic gain factor) - in the event that the setpoint is smaller than the actual value - correspondingly slower controller response also leads to a stable, uncritical situation.
  • the arrangement is such that the larger amplification factor is selected to be approximately 1.3-2, preferably 1.5 times as large as the basic amplification factor. These values have proven to be particularly favorable.
  • the procedure can preferably be such that a control process causing a change in the manipulated variable only takes place if the setpoint / actual value difference lies within a predetermined tolerance band. Because of this configuration, the controller only emits a control voltage change when the specified tolerance band is exceeded.
  • the controller works with a hysteresis. This mode of operation has the advantage that stochastic fluctuations in the measurement signal (actual value or a value dependent thereon) are not taken into account, so that there is no unnecessary intervention by the controller and, moreover, the adjustment devices are protected by the lower stress.
  • the process control can be further improved by overlaying the control with a control for the compensation of disturbance variables of known effect.
  • the result of this procedure is that the effects of known types of disturbance variables do not have to be compensated for in full by means of the control loop. Rather, the compensation of the disturbance variable or disturbance variables ensures that all essential parameters adjust to a new operating state.
  • the procedure is such that the control always remains active even during the compensation process.
  • the described compensation of compensated disturbance variables can be, for example, changes in the printing speed, the ink flow, the temperature or air flow.
  • the mentioned disturbance variable compensation is preferably implemented by superimposing compensation variables on the controller output variable, which are determined from the measurement of disturbance variables with a known effect on the dampening solution guidance.
  • controller output variable is overlaid with a compensation variable which results from the measurement of only one disturbance variable. If several disturbance variables are to be compensated, a corresponding number of measurements are carried out and there is a corresponding number of compensation variable superimpositions.
  • the compensation variable or to determine it from stored tables or from characteristic curves.
  • Such tables or characteristic curves can, for example, be stored in corresponding process control computers.
  • the calc The compensation size can be determined by a computer.
  • the process is carried out with a setpoint setting that is close to the lubrication limit.
  • the actual value represents a measure of the amount of dampening solution or the thickness of the dampening solution layer.
  • An offset printing press 1 which has a printing unit 2 and a further printing unit 3.
  • the printing unit 2 will be discussed and the control arrangement will only be described here.
  • the printing unit 3 is also provided with a corresponding control device.
  • a number of inking rollers (not shown) and, moreover, several dampening rollers 5 are assigned to the plate cylinder 4 of the printing unit 2 which has the printing plate.
  • the dampening roller 5 'cooperates with a dampening solution reservoir 6.
  • the dampening roller 5 'thus formed as an immersion roller can be changed in its speed. This is indicated by the arrow pointing to it.
  • the speed is taken from the pressure cylinder 7 via an active connection 8 and transmitted to a tachometer generator 9.
  • the pressure cylinder 7 is provided with a rotary encoder 10 which detects the angular position.
  • the following peripheral devices are also provided: an evaluation circuit 11, a floppy disk drive 12, a computer 13 and a measurement data acquisition unit 14.
  • an evaluation circuit 11 the surface of the printing plate arranged on the plate cylinder 4 is optically scanned by a sensor 15, which is connected to the evaluation circuit 11 via a line 16.
  • the evaluation circuit is connected to the computer via a connection 17. This is connected via lines 18 and 19 to the floppy disk drive and the measurement data acquisition unit.
  • the rotary encoder 10 is connected to the measurement data acquisition unit 14 via a line 20 and the tachometer generator 9 is also connected to the measurement data acquisition unit 14 via a line 21.
  • the line 22 leads from the measurement data acquisition unit 14 to the drive, not shown, for the dampening roller 5 '.
  • the sensor 5 determines the layer thickness of the dampening solution on the printing plate and feeds it to the evaluation circuit 11, which carries out appropriate data processing.
  • the actual value of the dampening solution layer thickness is compared with a predetermined target value, which is selected such that it is relatively close to the so-called lubrication limit.
  • This smear limit denotes the dampening solution quantity value or dampening solution layer thickness value at which ink-free areas of the printing plate begin to take on color. Specifying such a target value has the advantage that excellent printing results are achieved.
  • the peripheral devices of the offset printing press 1 now form a control circuit, which will be described in more detail below, such that a deviation of the dampening solution layer thickness (actual value) detected by the sensor 5 from the predetermined target value leads to an adjustment of the speed of the dampening roller 5 '(regulation of the dipping roller speed nT) .
  • the controller In the control process, proceed in such a way that the controller - depending on the state - works with different amplification factors.
  • an influence depending on the printing speed is provided; this is done, for example, by supplying the tachometer voltage of the tachometer generator 9 via the line 21 to the measurement data acquisition unit 14. The details of this are explained below.
  • the measurement request is sent when a certain machine position is reached (counted in degrees or pulses), so that the measuring head measures at the location provided on the printing plate.
  • the zero pulse is only used to reset the counter f, the pulse count to determine the current machine position.
  • the setpoint value of the dampening solution quantity (or dampening solution layer thickness) Sw soll is fed to a summing point 23.
  • the actual value of the dampening solution amount (or dampening solution layer thickness) Sw is also fed to the summing point 23 with a negative sign.
  • the difference (control deviation Xd) Sw soll - Sw ist resulting from these two values is fed to a controller 24.
  • the controller output is connected to the dampening unit 26 of the offset printing press 1 via a summing point 25.
  • the immersion roller speed nT of the dampening unit 26 is set.
  • the block shown next to the dampening unit 26 represents the printing plate 27, which is located on the plate cylinder 4 of the offset printing press 1. This is followed by a further summing point 28, the output variable of which embodies the real dampening solution layer thickness on the printing plate.
  • the arrow 29 pointing to the summing point 28 indicates disturbance variables influencing the dampening solution layer thickness. These disturbances can be for example, due to air movements, color tracking or temperature changes.
  • the dampening solution layer thickness on the pressure plate 27 is detected by the sensor 15, which feeds its data to the evaluation circuit 11, which is represented in FIG. 2 by block 30 (measured value processing, averaging).
  • the output value of the measured value processing is the actual value Sw ist, which is sent to the summing point 23.
  • the control deviation Xd is fed to a block 32, the circuit of which influences the controller 24 by influencing the gain factor KR.
  • a larger amplification factor is used than in the case of control deviations in which the setpoint Sw soll is smaller than the actual value Sw ist.
  • the higher amplification factor is preferably approximately 1.5 times as large as the lower amplification factor (basic amplification factor).
  • the controller 24 is preferably designed as a PI controller.
  • the compensation circuit 33 can carry out a speed compensation, that is to say an influence on the printing process parameters, caused by a change in the printing speed.
  • a speed compensation that is to say an influence on the printing process parameters, caused by a change in the printing speed.
  • variables other than disturbance variables can also be taken into account in terms of compensation. All the disturbance variables whose effect is known are possible, so that they can be measured effectively by means of measurement, calculation or extraction from tables or characteristic curves.
  • the compensation circuit 33 is supplied with a possible change in speed of the printing process. This is called Delta UM. Via a dampening system compensation characteristic the quantity Uk is determined, which represents a voltage for speed compensation. This voltage is fed to the summing point 25.
  • Such an arrangement means that changes in the printing speed do not have to be corrected by the control loop; rather, this speed compensation is superimposed on the control loop as a control.
  • This combination of regulation by the compensation device (compensation circuit 33) results in a substantially more constant dampening solution guidance than in the event that one would not intervene in a controlling manner but would compensate for such disturbances in a regulating manner.
  • a deviation from the target value is corrected considerably faster.
  • Compensation devices known from the prior art, which operate as a pure control have the disadvantage that additional disturbance variables are not compensated for by the lack of regulation. This does not apply to the arrangement according to the invention due to the superimposition with the control.
  • a different control characteristic for control deviations greater or less than 0 is provided by using different gain factors KR.
  • Such a regulation can preferably be superimposed on the described compensation method for disturbance variables with a known effect as a control.
  • the larger gain factor is preferably chosen to be 1.5 times as large as the basic gain factor.
  • the light reflected from the printing plate is detected via a line of photodiodes.
  • the photodiode line By using the photodiode line, it is possible to measure the entire scattered light curve over the length of the line.
  • a characteristic variable Sw corresponding to the amount of dampening solution or dampening solution layer thickness is calculated in the downstream evaluation circuit 11 from the radiation intensities determined on the individual diodes of the diode row.
  • FIG. 3 shows a diagram on the abscissa the time t and on the ordinate the dampening solution layer thickness Sw is shown.
  • the lubrication limit is shown in dash-dotted lines. As desired according to the invention, the setpoint for the dampening solution layer thickness Sw soll extends above this lubrication limit.
  • the actual value of the dampening solution layer thickness Sw is fluctuating in time over the target value Sw target, whereby it can be seen that control deviations greater and less than 0 occur, for example due to disturbance factors, that is, where the target value is greater than the actual value, If there is a control deviation greater than 0, which leads to the application of an increased amplification factor, and where the setpoint is less than the actual value, the control deviation takes on a value less than 0, an amplification factor being used that is smaller than in the case described above .
  • FIG. 3 It can also be seen from FIG. 3 that the critical range is formed between the desired value Sw soll and the lubrication limit, that is to say that regulator vibrations in this section run the risk of spoiling the printed product by lubrication.
  • the so-called uncritical range lies above the setpoint Sw soll. If the actual value lies in this zone, there is more water than required on the printing plate, but this condition is not so critical for a deterioration of the printed product.
  • a counter is present in the critical zone Increased gain factor of the controller is provided above the basic gain factor. If the uncritical area is approached, it is permissible for the process control to use a lower amplification factor, so that leaving the uncritical area takes place more slowly, but - as already described - this does not have any damaging effects on the pressure.
  • the layer thickness of the dampening solution film on the printing plate will initially increase, so that the actual value Sw ist exceeds the target value Sw soll.
  • the controller accordingly operates in the non-critical range (cf. FIG. 3), only the basic gain factor KR being used. With a corresponding time constant, the actual value Sw act again moves towards the setpoint Sw target in the further course.
  • 6 to 8 correspond to an operating mode of the control according to the invention using a target / actual value tolerance band.
  • the controller works with a kind of hysteresis, because its control voltage only changes when the setpoint-actual value difference lies outside a predetermined tolerance band.
  • the controller only reacts with manipulated variable changes when the specified tolerance of the control deviation is exceeded.
  • stochastic fluctuations in the measurement signal are disregarded, which leads to a more even process.
  • the procedure is such that a hysteresis element 34 is connected between the controller 24 and the summing point 23.
  • the control deviation Xd is supplied to the hysteresis element 34 as input value and a modified control variable Xd * leaves the arrangement as the output voltage.
  • the functional relationship between Xd and Xd * can be seen in the diagram in FIG. 7. Starting from the coordinate origin, the modified control deviation Xd * remains at 0 when the positive value Xd increases. Only when the threshold value S1 is exceeded does the modified control deviation Xd * jump to a certain value and then increase linearly from there with Xd. If the control deviation is reduced from there, the modified control deviation Xd * linearly decreases to 0. If the control deviation Xd exceeds the value 0, that is, if it becomes negative, there is a corresponding mirror image behavior. The value -Xd * increases suddenly only when a threshold value S2 is exceeded.
  • FIG. 9 shows the previously described effect of the actual and setpoint values due to the compensation control superimposed on the controller structure.
  • the printing speed increases from 4,000 sheets per hour to 6,000 sheets
  • the printing capacity is reduced from 6,000 prints per hour to 4,000 prints per hour.
  • the speed compensation only results in a relatively short, damped oscillation of the actual value Sw is around the setpoint Sw target, the controller needing to intervene only slightly, since the essential parameter changes are already intercepted by the higher-level control.
  • an optimal process control can be achieved with the method according to the invention.

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  • Inking, Control Or Cleaning Of Printing Machines (AREA)
  • Rotary Presses (AREA)
  • Feedback Control In General (AREA)
  • Screen Printers (AREA)
EP90102549A 1989-03-09 1990-02-09 Méthode de réglage d'humidité dans une imprimerie offset Expired - Lifetime EP0386489B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3907584A DE3907584A1 (de) 1989-03-09 1989-03-09 Verfahren zur feuchteregelung bei einer offsetdruckmaschine
DE3907584 1989-03-09

Publications (3)

Publication Number Publication Date
EP0386489A2 true EP0386489A2 (fr) 1990-09-12
EP0386489A3 EP0386489A3 (fr) 1991-04-03
EP0386489B1 EP0386489B1 (fr) 1994-05-18

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ID=6375897

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Application Number Title Priority Date Filing Date
EP90102549A Expired - Lifetime EP0386489B1 (fr) 1989-03-09 1990-02-09 Méthode de réglage d'humidité dans une imprimerie offset

Country Status (7)

Country Link
EP (1) EP0386489B1 (fr)
JP (1) JPH02273236A (fr)
CN (1) CN1019651B (fr)
AU (1) AU625335B2 (fr)
CA (1) CA2008816A1 (fr)
DE (2) DE3907584A1 (fr)
ES (1) ES2056260T3 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2666765A1 (fr) * 1990-09-14 1992-03-20 Roland Man Druckmasch Procede pour commander l'alimentation en agent mouillant sur la plaque d'impression d'une machine imprimante offset.
WO1994011192A1 (fr) * 1992-11-14 1994-05-26 Koenig & Bauer Aktiengesellschaft Procede permettant d'influer sur la densite optique de la couche d'encre appliquee sur un support d'impression
EP1261486A1 (fr) * 2000-03-09 2002-12-04 Commonwealth Scientific And Industrial Research Organisation Encre et solution de mouillage de determination pour impression offset

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4244500A1 (de) * 1992-12-30 1994-07-07 Heidelberger Druckmasch Ag Verfahren zum Zuführen von Feuchtmittel
US5592880A (en) * 1993-12-30 1997-01-14 Heidelberger Druckmaschinen Method of supplying or feeding dampening solution
DE10056247B4 (de) * 1999-12-06 2011-07-21 Heidelberger Druckmaschinen AG, 69115 Verfahren zum Steuern der Farbmenge in einer Druckmaschine
DE102010034350A1 (de) * 2010-08-14 2012-02-16 Manroland Ag Einrichtung zur Regelung des Feuchtmittelauftrags und Farbauftrags in einer Druckmaschine
DE102012002260A1 (de) 2011-02-24 2012-08-30 Heidelberger Druckmaschinen Aktiengesellschaft Maschinenabhängige Kompensation in Farbwerk und Feuchtwerk
DE102013001031A1 (de) * 2012-02-17 2013-08-22 Heidelberger Druckmaschinen Ag Herstellungsverfahren für ein Schmiergrenzen-Kontrollfeld einer Offset-Druckplatte
DE102013009466A1 (de) * 2012-07-04 2014-01-09 Heidelberger Druckmaschinen Ag Steuerungsverfahren zur Dosierung der Feuchtmittelmenge

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3946297A (en) * 1974-03-05 1976-03-23 Johnson Service Company Insertion integrating controller
DE3636507A1 (de) * 1986-10-27 1988-04-28 Grapho Metronic Gmbh & Co Verfahren zur einstellung des befeuchtungsgrades des plattenzylinders einer offsetdruckmaschine

Family Cites Families (8)

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Publication number Priority date Publication date Assignee Title
US3536006A (en) * 1967-07-11 1970-10-27 Vandercook & Sons Inc Multicolor rotary offset printing press with cylinder interruption
US3700984A (en) * 1971-03-08 1972-10-24 North American Rockwell Dampener control system for lithographic printing press
DE2214721B1 (de) * 1972-03-25 1973-06-14 Heidelberger Druckmaschinen Ag, 6900 Heidelberg Verfahren und vorrichtung zum selbsttaetigen ausregeln von schwankungen der farb- und feuchtfluessigkeitsfuehrung an offsetmaschinen
US4029008A (en) * 1976-05-24 1977-06-14 Addressograph Multigraph Corporation Moisture control system
DE2931579C2 (de) * 1979-08-03 1982-11-11 Heidelberger Druckmaschinen Ag, 6900 Heidelberg Einrichtung zur zonalen Regulierung der Feuchtmittelführung
DE3003642A1 (de) * 1980-02-01 1981-08-06 M.A.N.- Roland Druckmaschinen AG, 6050 Offenbach Offsetdruckmaschine
DE3211157A1 (de) * 1982-03-26 1983-10-06 Roland Man Druckmasch Verfahren und vorrichtung zum befeuchten von druckplatten
DD259820B5 (de) * 1987-04-02 1996-05-30 Kba Planeta Ag Verfahren und einrichtung zur steurung der drehzahl des feuchtduktormotors

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3946297A (en) * 1974-03-05 1976-03-23 Johnson Service Company Insertion integrating controller
DE3636507A1 (de) * 1986-10-27 1988-04-28 Grapho Metronic Gmbh & Co Verfahren zur einstellung des befeuchtungsgrades des plattenzylinders einer offsetdruckmaschine

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2666765A1 (fr) * 1990-09-14 1992-03-20 Roland Man Druckmasch Procede pour commander l'alimentation en agent mouillant sur la plaque d'impression d'une machine imprimante offset.
WO1994011192A1 (fr) * 1992-11-14 1994-05-26 Koenig & Bauer Aktiengesellschaft Procede permettant d'influer sur la densite optique de la couche d'encre appliquee sur un support d'impression
US5568769A (en) * 1992-11-14 1996-10-29 Koenit & Bauer Aktiengesellschaft Process for influencing the optical density of a printing ink layer on a print carrier
EP1261486A1 (fr) * 2000-03-09 2002-12-04 Commonwealth Scientific And Industrial Research Organisation Encre et solution de mouillage de determination pour impression offset
EP1261486A4 (fr) * 2000-03-09 2005-03-23 Commw Scient Ind Res Org Encre et solution de mouillage de determination pour impression offset

Also Published As

Publication number Publication date
CN1045366A (zh) 1990-09-19
AU4879990A (en) 1990-09-13
EP0386489A3 (fr) 1991-04-03
EP0386489B1 (fr) 1994-05-18
AU625335B2 (en) 1992-07-09
CA2008816A1 (fr) 1990-09-09
JPH02273236A (ja) 1990-11-07
DE3907584A1 (de) 1990-09-13
ES2056260T3 (es) 1994-10-01
DE59005701D1 (de) 1994-06-23
CN1019651B (zh) 1992-12-30

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