DE4413735C2 - Method for controlling or regulating the printing process of an autotypically working printing machine when printing under pressure on a printing material - Google Patents

Method for controlling or regulating the printing process of an autotypically working printing machine when printing under pressure on a printing material

Info

Publication number
DE4413735C2
DE4413735C2 DE19944413735 DE4413735A DE4413735C2 DE 4413735 C2 DE4413735 C2 DE 4413735C2 DE 19944413735 DE19944413735 DE 19944413735 DE 4413735 A DE4413735 A DE 4413735A DE 4413735 C2 DE4413735 C2 DE 4413735C2
Authority
DE
Germany
Prior art keywords
printing
pressure
regulating
cylinders
dot size
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
Application number
DE19944413735
Other languages
German (de)
Other versions
DE4413735A1 (en
Inventor
Gerhard Loeffler
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 DE19944413735 priority Critical patent/DE4413735C2/en
Publication of DE4413735A1 publication Critical patent/DE4413735A1/en
Application granted granted Critical
Publication of DE4413735C2 publication Critical patent/DE4413735C2/en
Anticipated expiration legal-status Critical
Expired - Fee Related 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

Description

The invention relates to a method for controlling or regulating the printing process an autotypically working printing machine when printing under pressure a printing material according to the preamble of claim 1. Such a method is in DE 42 09 165 A1 described. The invention is applicable to rotary printing machines where there is a contact between the substrate and the pressure-generating cylinders takes place and in which the printed image is composed of halftone dots.

Printing presses are used to control and regulate the coloring with a control or Control device connected in which target and material and copying process-dependent Print characteristic curves can be stored. According to these pressure characteristics certain operating parameters set to defined values and constructive precautions met, so that there is an optimal print contrast in the print image.

In the method described in DE 42 09 165 A1 for setting the The dot size for an offset rotary press is the actual values of Pressure characteristics of the machine recorded and in the event of deviations from target values Compensation measures initiated. The mean setpoints of the Screen dot sizes in the production of the printing forms or in the presetting of the Machine taking into account the deviations updated per color printing Printing characteristics adjusted. The method provides for regulating the Dot size, the position of ink screws and / or the dampening unit setting is changed.

DE 32 09 483 A1 describes a method for the automatic setting of the Flexographic printing machines for four-color printing described in which an actual color location is determined for a screen test field printed out by all printing units, by the proportions of existing printing inks based on a densitometric measurement  be determined. The actual color location is compared with a target color location, whereby according to the deviations of the center distance of a plate cylinder to associated impression cylinder is changed until the actual color location and the target color location in match a color triangle. A section of the Print image can be selected, the a target value with the most uniform possible color distribution equivalent.

In a method for controlling the printing process on a printing press according to DE 42 29 267 A1 photoelectric measurements on grids make them one in print current actual characteristic curve reached. The current actual characteristic curve becomes Inclusion of other printing parameters a variety of achievable actual characteristics calculates from which the optimal actual characteristic curve is selected that corresponds to a target characteristic curve on next comes. In order to approach the optimal actual characteristic curve, the color guide Dampening solution guidance and other machine parameters changed.

In the known methods it can be seen that one for a specific machine type specifies a pressure characteristic in which the mechanical peculiarities of the machine concerned are not taken into account and that during printing the Characteristic pressure curve, e.g. B. by wear of the pressure plate and by external influences, such as Temperature fluctuations, fluctuations in humidity and deflection of the cylinders and Thickness fluctuations in the substrate, can change constantly, so that corrective interventions are necessary by the printer, insofar as this changes visually at all can determine; in addition, measurements at individual measuring fields are not representative of the halftone dot size in the entire printed image.

The object of the invention is to provide a method which improves the ongoing control or regulation of the dot size during printing allows.

The problem is solved with a method with the features according to Claim 1. Advantageous refinements result from the subclaims.  

The method makes it possible to determine the grid point size at any point in the Adjust the print image to the optimum. With an image recording device, this can be done Entire print image are captured, so that actual value signals for the dot size not only accruing from special measuring fields.

In a variant of the invention, it is provided that the screen dot size is local in the printed image to change by actuating signals acting on a device for adjusting the cylinder pressure, which is able to locally change the pressure between said cylinders. On in this way, for example, inhomogeneities in the rubber blanket Compensate the pressure transfer cylinder of an offset printing machine.

The steep signals can influence other operations, such as the dot size determine. In addition to the cylinder pressure setting, the ink supply, the Quantity of dampening solution in offset printing, the temperature of the ink and the dampening solution and the proportions of fountain solution additives in the fountain solution are continuously changed.

It is also possible that the setpoint signals for the screen dot size in the form of a Pressure characteristic curve can be stored in advance in the control or regulating device, and that a current pressure characteristic is derived from the signals of the image recording device becomes. A tone value increase then arises as a comparison value between these said steep signals derived for actuators for influencing the grid point size become.

The invention will be explained in more detail using an exemplary embodiment:

In the figure, a printing unit 1 of an offset printing machine is shown. It consists of a printing cylinder 2 with a fixed axis 3 , a transfer cylinder 4 and a printing form cylinder 5 , each with axes 8 and 9 which can be displaced in the directions 6 and 7 .

The transfer cylinder 4 and the printing form cylinder 5 are displaceable in linear bearings 10 and 11 , the axes 8 and 9 being coupled to hydraulic working cylinders 12 and 13, respectively, which effect the displacement in the directions 6 and 7 . A web 14 runs in the printing nip between the transfer cylinder 4 and the printing cylinder 2 and is printed on the upper side. Furthermore, a device 15 for supplying fountain solution and an ink application device 16 are assigned to the printing form cylinder 5 . Controllable metering valves 19 , 20 are provided for adjusting the supply of dampening solution from a dampening solution storage container 17 and of ink from an ink storage container 18 . The device 15 for supplying dampening solution and the ink application device 16 act in ink zones distributed uniformly over the width of the printing form cylinder 5 . The temperature of the dampening solution in the dampening solution reservoir 17 and the color in the ink reservoir 18 can be controlled by means of heating coils 21 , 22 . The dampening solution reservoir 17 is connected to a container 23 for a dampening solution additive, a valve 24 being provided for controlling the metering of the dampening solution additive. To control the printing press, a control or regulating device 25 is provided, which has inputs to which setpoint and actual value signals R should , R can be fed to the screen dot size in the printed image. The actual value signals R ist for the screen dot size are obtained with the aid of an image recording device 26 , which scans the entire image of the printed image. The control or regulating device 25 has a number of control outputs which are connected to the actuating elements for the working cylinders 12 , 13 , to the control inputs of the metering valves 19 , 20 and 24 and to the heating windings 21 , 22 .

The implementation of the method for controlling or regulating the grid point size is described below:
Before the start of printing, the setpoint signals R soll are stored in the control or regulating device 25 . With the aid of the image recording device 26 , actual value signals R is generated for the screen dot size and fed to the control or regulating device 25 . In the control or regulating device 25, the actual signals R are dependent coordinates is intended with the set value signals R compared. The working cylinders 12 , 13 are activated as a function of comparison signals, so that there is a change in the distance between the axes 3 , 8 , 9 . As a result, the pressure between the printing cylinder 2 and the transfer cylinder 4 on the web 14 and between the transfer cylinder 4 and the printing form cylinder 5 is changed. A change in the pressure causes a change in the screen dot size in the printed image. In this way, a deviation of the screen dot size from the target value is constantly compensated. In addition to the change in the pressure, the screen dot size can be influenced by the amount of dampening solution supplied via the device 15 for supplying the dampening solution, the proportion of the dampening solution addition supplied to the dampening solution and the temperature of the dampening solution and the color. For this purpose, corresponding steep signals to the valves 19 , 20 , 24 and the heating windings 21 , 22 are output at the outputs of the control or regulating device 25 .

It is possible to set the pressure between the cylinders 2 , 4 , 5 in the direction of the surface lines and in the circumferential direction of the cylinders 2 , 4 , 5 as a function of the coordinate. This makes it possible to compensate for changes in the dot size which, B. caused by the deflection of the axes 3 , 8 , 9 and by inhomogeneities in the transfer cylinder 5 .

The setpoint signals R soll can also be input into the control or regulating device 25 in the form of a pressure characteristic. The current pressure characteristic curve is then determined in the control or regulating device 25 from the signals of the image recording device 26 and is compared with the stored pressure characteristic curve. The difference between the two characteristic curves gives the dot gain from which the control signals for the working cylinders 12 , 13 , the valves 19 , 20 , 24 and the heating coils 21 , 22 can be derived.

LIST OF REFERENCE NUMBERS

1

printing unit

2

pressure cylinder

3

axis

4

transfer cylinder

5

Plate cylinder

6

.

7

directions

8th

.

9

axes

10

.

11

linear bearings

12

.

13

working cylinder

14

train

15

Device for supplying dampening solution

16

Inking device

17

Dampening solution reservoir

18

Ink reservoir

19

.

20

Metering valves

21

.

22

heating coils

23

container

24

Valve

25

Control or regulating device

26

Image recording device

Claims (2)

1. A method for controlling or regulating the printing process of an autotypically operating printing machine when printing under printing pressure on a printing material,
in which an actual printing characteristic curve is determined in accordance with a relationship of the raster dot size in a current print image versus the raster dot size of a printing form of at least two provided cylinders which are involved in the printing, by photoelectric scanning of the current print image and is compared with a predetermined target pressure characteristic curve, and
in which, depending on the comparison, operating processes are set in the printing press which bring about a change in the actual printing characteristic,
characterized by
that the printed image is scanned over the entire surface,
that the provision is adjusted depending on the comparison until a minimum comparison value is reached and
that the provision and the pressure on the substrate are partially changed locally.
2. The method according to claim 1, characterized, that the pressure between the cylinders involved in the pressure in the direction of the Surface lines and in the circumferential direction of the cylinders are set depending on the coordinates becomes.
DE19944413735 1994-04-20 1994-04-20 Method for controlling or regulating the printing process of an autotypically working printing machine when printing under pressure on a printing material Expired - Fee Related DE4413735C2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE19944413735 DE4413735C2 (en) 1994-04-20 1994-04-20 Method for controlling or regulating the printing process of an autotypically working printing machine when printing under pressure on a printing material

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19944413735 DE4413735C2 (en) 1994-04-20 1994-04-20 Method for controlling or regulating the printing process of an autotypically working printing machine when printing under pressure on a printing material

Publications (2)

Publication Number Publication Date
DE4413735A1 DE4413735A1 (en) 1995-10-26
DE4413735C2 true DE4413735C2 (en) 2003-09-25

Family

ID=6515971

Family Applications (1)

Application Number Title Priority Date Filing Date
DE19944413735 Expired - Fee Related DE4413735C2 (en) 1994-04-20 1994-04-20 Method for controlling or regulating the printing process of an autotypically working printing machine when printing under pressure on a printing material

Country Status (1)

Country Link
DE (1) DE4413735C2 (en)

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE20122584U1 (en) * 2001-03-27 2006-07-27 Windmöller & Hölscher Kg Print image setting device for rotary printing machine has camera feeding successively acquired print images to control or regulating unit that produces signals for participating rollers
JP3943873B2 (en) * 2001-07-26 2007-07-11 大日本スクリーン製造株式会社 Ink and water supply amount control device in printing machine and printing system provided with the same
DE10302747A1 (en) * 2003-01-24 2004-08-12 Windmöller & Hölscher Method for correcting variations in the amount of ink transferred to the printed image during the printing process
ITBO20030627A1 (en) * 2003-10-23 2005-04-24 Gd Spa Unit 'print of a tape for an automatic machine.
EP1579992B1 (en) 2004-03-23 2012-06-06 Koenig & Bauer Aktiengesellschaft Printing press with at least one inking device
ES2264390B1 (en) * 2005-06-10 2008-03-01 Comexi, S.A. Method for automatically adjusting print pressure in flexographic printing machines.
EP1839854A1 (en) * 2006-03-31 2007-10-03 ELTROMAT GmbH Method and device for the optimal position adjustment in a rotary flexographic printing machine comprising several printing groups
EP1961569A1 (en) 2007-02-21 2008-08-27 Bobst Sa Device and method of adjustment for a rotary printing machine
DE102008025114A1 (en) * 2008-05-26 2010-04-22 Bst International Gmbh Method and device for adjusting a printed image generated by a rotary printing machine
DE102013005911A1 (en) 2012-04-30 2013-10-31 Heidelberger Druckmaschinen Ag Offset printing process

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3209483A1 (en) * 1982-03-16 1983-09-29 Windmoeller & Hoelscher Method for automatically setting the inks printed by flexo printing machines for four-color printing
DE3925011A1 (en) * 1988-08-11 1990-05-17 Polygraph Leipzig Method and arrangement for monitoring the print quality of multicolor printed documents of an offset printing machine
EP0136542B1 (en) * 1983-09-20 1990-08-08 Kollmorgen Corporation Color printing control using halftone control areas
DE4209165A1 (en) * 1991-03-21 1992-09-24 Wifag Maschf Method for setting the grid dots for an offset rotation printing machine
US5187376A (en) * 1990-12-20 1993-02-16 Toshiba Kikai Kabushiki Kaisha Print monitoring apparatus with data processing
DE4229267A1 (en) * 1992-09-02 1994-03-03 Roland Man Druckmasch Method for controlling the printing process on an autotypically operating printing machine, in particular sheet-fed offset printing machine

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3209483A1 (en) * 1982-03-16 1983-09-29 Windmoeller & Hoelscher Method for automatically setting the inks printed by flexo printing machines for four-color printing
EP0136542B1 (en) * 1983-09-20 1990-08-08 Kollmorgen Corporation Color printing control using halftone control areas
DE3925011A1 (en) * 1988-08-11 1990-05-17 Polygraph Leipzig Method and arrangement for monitoring the print quality of multicolor printed documents of an offset printing machine
US5187376A (en) * 1990-12-20 1993-02-16 Toshiba Kikai Kabushiki Kaisha Print monitoring apparatus with data processing
DE4209165A1 (en) * 1991-03-21 1992-09-24 Wifag Maschf Method for setting the grid dots for an offset rotation printing machine
DE4229267A1 (en) * 1992-09-02 1994-03-03 Roland Man Druckmasch Method for controlling the printing process on an autotypically operating printing machine, in particular sheet-fed offset printing machine

Non-Patent Citations (5)

* Cited by examiner, † Cited by third party
Title
BOSSE *
BRUNE: FOGRA-Forschungsbericht 6010, München 1975, S.40 ff. *
Dt. Drucker, Nr.36, 30.9.93, w44,w49 *
LOSPICKL,Werner: Druckkennlinien des Mehrfarben-Offsetdruckes, FOGRA/BVDeV, Wies- baden/München, 1977 *
REBNER *

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8304 Grant after examination procedure
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