DE102008049355A1 - Offset - Google Patents

Abstract

Offset printing machine with a printing unit having a printing unit with an inking unit for ink supply of the printing unit and a dampening unit for fountain solution supply of the printing unit and a control device which is coupled to the printing unit and its inking unit and dampening unit for controlling this, wherein in at least one of the cylinders of the printing unit Temperature measuring means for providing a temperature profile over a bale width of the cylinder of the printing unit away representing temperature signals and first transmission means are integrated for transmitting the temperature signals to the control device and wherein the StMeuchtmittelzufuhr the dampening unit based on the temperature signals.

Description

The The invention relates to an offset printing machine, and more particularly to a Printing unit for an offset printing machine, an offset printing press equipped with the printing unit and a method of operating the offset printing machine.

Offset printing machines, such as newspaper offset printing presses, today's design are largely automated. For this purpose, have the offset printing machines usually a sensor on which deviations in production parameters and detected in the printed product and which signals to control z. B. a cut register, a color register and a color density generated. At usual Offset presses will change the settings for a color feed and a Dampening solution supply, which significantly affect the print quality, usually manually offline or automatically inline or online corrected. The latter can z. B. over traversing or fixed Cameras, which have a nearly complete color density profile of measurement marks and / or from measurements in the subject. It is very expensive and further assumes that the offset printing press is optimally pre-set is (eg all registers, the ink / dampening solution and the ink / dampening solution run-up curves). An optimal start of the offset printing machine u. a. also dependent on a standardized preliminary stage (workflow).

Of the Invention is based on the object, a printing unit for an offset printing machine, a equipped with such a printing unit offset printing machine and to provide a method of operating the offset printing machine, which influence a control of the print quality in a simple and effective manner Ensure process parameters.

This is with a printing unit according to claim 1, an offset printing machine according to claim 5 or a method according to claim 8 reached. Further developments of the invention are defined in the respective dependent claims.

According to one The first aspect of the invention includes a printing unit for an offset printing press Printing unit with an inking unit for ink supply of the printing unit and a dampening unit for fountain solution supply of the printing unit and a control device on, with the printing unit as well as its inking unit and dampening unit coupled to control this, wherein in at least one cylinder of the Printing unit Temperature measuring device for providing a precise process-relevant temperature profile over one Bale width of the cylinder of the printing unit across temperature signals and integrated first transmission means are to transfer the temperature signals to the control device, wherein the control device is set up to control a dampening solution supply of the dampening unit based on the temperature signals.

Of the solution according to the invention based on the principle, temperatures of a printing cylinder as To measure auxiliary quantities and based on these auxiliary variables setting algorithms for the the print quality derive influencing dampening solution. In other words will over the measurement of temperatures of a printing cylinder on the dampening solution supply and thus influenced in the consequence on the color density.

Prefers is at least a form cylinder, z. B. a plate cylinder, the printing unit equipped with the temperature measuring means. Of course it is also possible or several other printing cylinder or one or more other printing cylinder, such. B. a transfer cylinder (eg, rubber cylinder), equipped with the temperature measuring means.

The Temperature detection takes place during the Printing process continuously and online. The in the printing cylinder integrated temperature measuring means preferably have temperature sensors and Power supply, which provides a power supply for the sensor operation and the signal transmission provide. The power supply means may, for example, induction means have in the form of a coil. The coil can be z. B. from outside of the printing cylinder can be acted upon by a changing magnetic field be.

According to one embodiment the printing unit according to the invention has these further color measuring means for providing a color application on a substrate representing color signals and second transmission means on to the transfer the color signals to the control device, wherein the control device is set up to control an ink supply of the inking unit Base of temperature signals and color signals.

In contrast to the prior art, according to this embodiment of the printing unit according to the invention, only a single (or very few) reference measurement (s) of the color measuring means is necessary, the results of the reference measurement (s) being linked to the parameters already determined for the dampening solution guide. As a result, it is possible to dispense with the zonal manipulation of ink zones of the inking unit. The inventively realized control system can, for. B. acting on a single printing plate on the entire plate cylinder or on all printing cylinders equally. In this context, he / she can According to the invention, a target / actual comparison of image data and / or a target / actual comparison of the color density can be provided.

The Color measuring agents can z. In the form of a hand densitometer (for offline measurement) and / or in the form of one or more color density measuring sensors and / or Color location measuring sensors (for an inline measurement) be educated. The color measuring agents are in suitable places, such as B. in a direction of the printing material directly after the Printing unit (with inline measurement), arranged.

According to one another embodiment the printing unit according to the invention if the control device is set up, the dampening solution supply Base of stored in the control device, predetermined Run-up curves for determine the dampening solution supply, from the temperature signals time-dependent temperature profiles to form the cylinder of the printing unit and the dampening solution supply and their run-up curves based on the temperature profiles time-dependent change.

D. h., the temperature measurement in one or more printing cylinders delivers a temperature profile over the entire width of this / these printing cylinder (s). This temperature profile is changing over the Runtime on the one hand, but also in machine downtime. There can depending on the length of stay to significant temperature increases, but also come to reductions. These temperature profiles will be according to the invention with suitable Linked algorithms, the fountain solution guide and their run-up curve influence.

According to one more another embodiment the printing unit according to the invention the control device is set up, the ink supply of the inking unit based on predetermined zonal ink quantity distribution ratios a print image to be printed and in the control device stored, predetermined ramp-up curves for the ink supply zonal to determine as well as the specific ink supply based on the time-dependent variable Dampening solution supply and the color signals while maintaining the zonal Ink quantity distribution ratios time-dependent to change.

According to the invention is exploited that the dampening solution guide in a close relation with the respective ink supply, which in usually zonal is different, stands. The color zones form in about the zonal color needs of Drucksujets from and follow as well Run-up curves. By linking the determined parameters for the dampening solution with the color signals, it is possible according to the ink supply under Maintaining the zonal color-quantity distribution ratios time-dependent too change and thus to influence the color density.

According to one second aspect of the invention comprises an offset printing machine a Printing unit according to one, any or all of the preceding embodiments in any conceivable manner Combination on.

According to one embodiment has the offset printing machine according to the invention Furthermore, a control panel, which is coupled to the control device and the controls for manually zonal changing the Ink supply and / or the dampening solution supply.

According to this Embodiment of the invention may, for. B. in extreme subjects and / or strong deviations of the procedural system components, such as As paper, paint and fountain solution, a zonal, manual Manipulation of the dosage of dampening solution and / or color made become.

According to one another embodiment the offset printing machine according to the invention The controls are between a first position in which the Controls for actuating are released, and a second position in which the controls against pressing are secured, relocatable.

The Control panel can z. B. arranged in a control station of the printing press and the controls can be z. B. designed as fold-away color / wet keys or retractable panels be. additionally can for preventive process monitoring in the control room z. B. a monitoring device (monitoring) be provided. For "normal" production is a manual readjustment not required, so at a shift the controls to the second position for such production could be.

According to one Third aspect of the invention, a method is provided for Operating an offset printing machine with at least one printing unit according to one, several or all embodiments of the invention described above in any conceivable combination, wherein in the method in at least one of the cylinders of the printing unit temperatures are measured where a temperature profile over representing a bale width of the cylinder of the printing unit Temperature signals are generated, the temperature signals to the Transfer control device and the control device a dampening solution supply of the dampening unit based on the temperature signals controls.

According to one embodiment of the method according to the invention is a Farbaufbrin measured on a printing material, wherein the color application representing color signals are generated, the color signals are transmitted to the control device and the control device controls an ink supply of the inking unit on the basis of the temperature signals and the color signals.

According to one another embodiment the method according to the invention When controlling the fountain solution, the dampening solution supply is started first Base of stored in the control device, predetermined Run-up curves for The dampening solution supply is determined from the temperature signals time-dependent Temperature profiles of the cylinder of the printing unit are formed as well then the dampening solution supply and their run-up curves based on the temperature profiles changed time-dependent.

According to one more embodiment the method according to the invention When controlling the ink supply, first, the ink supply of the inking unit based on predetermined zonal ink quantity distribution ratios a print image to be printed and in the control device stored, predetermined ramp-up curves for the color supply zonal determined and then the particular ink supply based on the time-varying variable dampening solution and the color signals while maintaining the zonal color-quantity distribution ratios time-dependent changed.

Of the third aspect of the invention is based on the same principles as the first and second aspect of the invention and provides the same Benefits like these are ready.

Of the first to third aspects of the invention may be practiced in accordance with the principles of the invention, measured by auxiliary quantities are used to control the printing process and in particular the print quality affecting Parameters, e.g. B. also in conjunction with an automatic printing plate loading / unloading system, with a automatic impression width control for printing cylinder or rollers, with an automatic pre-inking system for printing cylinder or rollers for a wimp poor quick start and / or with an automatic Web tension control, etc. combined.

On this way is one for the operation zoneless and in the printing process quasi unmanned or user-free or extremely low-maintenance Offset printing machine can be realized, resulting in a considerable amount of personnel costs, up times or start-up times, material costs, etc. can be saved.

in the The invention will be described below with reference to preferred embodiments and with reference to the attached figures in more detail described.

1 shows components of an offset printing press according to an embodiment of the invention.

2 shows further components of the offset printing press from 1 ,

The 1 and 2 show components of a newspaper offset press 1 (in the following simply printing machine 1 ). The printing press 1 has a plurality of printing units 10 (in 1 only two shown), which are arranged according to this embodiment in pairs to a plurality of so-called four-high towers.

The printing units 10 each have four printing units 20 each of which has a forme cylinder in the form of a plate cylinder 21 and a transfer cylinder in the form of a rubber cylinder 22 , an inking unit 23 with a plurality of rollers or cylinders (not separately designated) for ink supply of the printing unit 20 and a dampening unit 24 with a plurality of rollers or cylinders (not separately designated) for fountain solution supply of the printing unit 20 having.

Two printing units each 20 work together, leaving the blanket cylinder 22 of a printing unit 20 the impression cylinder or impression cylinder for the other printing unit 20 forms.

According to this embodiment, in the plate cylinder 21 Each printing unit has a plurality of temperature measuring sensors 21a such over a bale width of the plate cylinder 21 and integrated along a circumference of that by means of the temperature measuring sensors 21a Temperature signals are providable, the temperature over the bale width and along the circumference of the plate cylinder 21 representing.

In every plate cylinder 21 Furthermore, first transmission means in the form of a radio transmitter (not shown) are integrated to transmit the temperature signals to one in the printing unit 20 integrated radio receiver (not shown).

A power supply for the temperature measuring sensors 21a and the radio transmitter is in accordance with the transformer principle via a in the plate cylinder 21 integrated induction coil (not shown) realized.

Every inking unit 23 points in the axial direction of the cylinder or rollers of the printing unit 20 a zonal divider (not shown) and a plurality of actuators (not shown) for separately controlling an ink feed for each color zone.

Every dampening unit 24 has a number of actuators (not shown) for controlling a fountain solution supply. According to one embodiment, the dampening unit 24 analogous to the inking unit 23 a zonal subdivision (not shown) and corresponding actuators (not shown).

Every printing unit 20 further comprises color measuring means in the form of one or more color density measurement sensors 25 (for each printing unit 20 is just a sensor 25 shown) providing color application to color signals representative of a substrate (not shown), and second transfer means in the form of electrical leads (not shown) adapted to transfer the color signals to an input / output interface 11 the printing unit 10 are coupled.

Furthermore, the radio receiver for the temperature signals of each printing unit are also 20 and the actuators of each inking unit 23 and every dampening unit 24 via not shown electrical lines to the input / output interface 11 the printing unit 10 coupled.

In addition, respective drives for the rotationally driven cylinders of the printing units 20 every printing unit 10 via not shown electrical lines to the input / output interface 11 the printing unit 10 coupled.

The printing press 1 further comprises a control device 40 on, over electrical wires 41 respectively. 42 with the input / output interface 11 every printing unit 10 is coupled.

According to this embodiment, the control device is 40 in a control station (not fully shown and not separately labeled) of the printing press 1 arranged. In the control room is also a control panel 50 arranged, over electrical lines 51 with the control device 40 is coupled.

The control panel 50 has a support surface 52 for patterning a printed copy D and controls 53 in the form of a plurality of control buttons for manually zonal changing the ink supply and / or the dampening solution supply.

The controls 53 are between a first position (see 2 ), in which the controls 53 for actuating, and a second position (not shown) in which the controls 53 are folded away, relocatable.

The control device 40 can be implemented in the form of hardware and / or software and has a memory 40a in which empirically determined run-up curves for the dampening solution supply and for the ink supply are stored. The control device 40 further comprises a computer means for executing in the memory 40a stored control algorithms or programs.

According to the in the control device 40 stored control algorithms or programs is used for each printing unit 20 in the control device 40 the dampening solution supply of the dampening unit 23 first based on the in the control device 40 stored, predetermined run-up curves for the dampening solution supply determined.

Then from the means of temperature measuring sensors 21a provided temperature signals time-dependent temperature profiles of the plate cylinder 21 educated. Thereafter, the dampening solution supply and its run-up curves are determined using empirically and in the control device 40 stored algorithms on the basis of temperature profiles changed time-dependent.

Further, according to the in the control device 40 stored control algorithms or programs for each printing unit 20 in the control device 40 First, the ink supply of the inking based on previously in the memory 40a input zonal ink quantity distribution ratios of a printed image to be printed and in the control device 40 stored, predetermined ramp-up curves for the color supply zonal determined.

Then, the determined ink supply is determined using empirically and in the control device 40 stored algorithms based on the time-varying dampening solution and the color signals, while maintaining the zonal ink quantity distribution ratios changed over time.

On this way, the dampening solution and the ink supply as well their respective ramp-up curves using the time-dependent temperature profiles and only a few reference color density measurements are adjusted or steadily corrected, ensuring that the desired color density and print quality become.

1

Offset

10

printing unit

11

Input / output interface

20

printing unit

21

plate cylinder

21a

Temperature measurement sensor

22

rubber cylinder

23

inking

24

dampening

25

Color density measuring sensors

40

control device

40a

Storage

41

electrical cables

42

electrical cables

50

control panel

51

electrical cables

52

bearing surface

53

controls

Claims (11)

Printing unit ( 10 ) for an offset printing machine ( 1 ), comprising: a printing unit ( 20 ) with an inking unit ( 23 ) to the ink supply of the printing unit ( 20 ) and a dampening unit ( 24 ) for dampening solution supply of the printing unit ( 20 ), and a control device ( 40 ), with the printing unit ( 20 ) as well as its inking unit ( 23 ) and dampening unit ( 24 ) for controlling it, wherein in at least one of the cylinders ( 21 ) of the printing unit ( 20 ) Temperature measuring means ( 21a ) for providing a temperature profile over a bale width of the cylinder ( 21 ) of the printing unit ( 20 ) temperature signals and first transmission means are integrated for transmitting the temperature signals to the control device ( 40 ), and wherein the control device ( 40 ) is arranged to control a dampening solution supply of the dampening unit ( 24 ) based on the temperature signals. Printing unit ( 10 ) according to claim 1, further comprising color measuring means ( 25 ) are provided for providing color signals on a substrate representing color signals and second transmission means for transmitting the color signals to the control device ( 40 ), and wherein the control device ( 40 ) is arranged to control an ink supply of the inking unit ( 23 ) based on the temperature signals and the color signals. Printing unit ( 10 ) according to claim 2, wherein the control device ( 40 ), the dampening solution supply based on in the control device ( 40 ) to determine predetermined ramp-up curves for the dampening solution supply, from the temperature signals time-dependent temperature profiles of the cylinder ( 21 ) of the printing unit ( 20 ) as well as to change the dampening solution supply and their run-up curves on the basis of the temperature profiles time-dependent. Printing unit ( 10 ) according to claim 3, wherein the control device ( 40 ), the ink supply of the inking unit ( 24 ) on the basis of predetermined, zonal ink quantity distribution ratios of a print image to be printed and in the control device ( 40 zonal to determine the predetermined ink run-up curves for the ink supply and to change the specific ink supply on the basis of the time-varying dampening solution and the color signals while maintaining the zonal ink quantity distribution ratios time-dependent. Offset printing machine ( 1 ) with a printing unit ( 10 ) according to one of claims 1 to 4. Offset printing machine ( 1 ) according to claim 5, further comprising a control panel ( 50 ) connected to the control device ( 40 ) and the controls ( 53 ) has for manual zonal altering the ink supply and / or the dampening solution supply. Offset printing machine ( 1 ) according to claim 6, wherein the controls ( 53 ) between a first position in which the controls ( 53 ) are released for actuation, and a second position in which the controls ( 53 ) are secured against actuation, are relocatable. Method for operating an offset printing machine ( 1 ) with at least one printing unit ( 10 ), which is a printing unit ( 20 ) with an inking unit ( 23 ) to the ink supply of the printing unit ( 20 ) and a dampening unit ( 24 ) for dampening solution supply of the printing unit ( 20 ) and a control device ( 40 ), which with the printing unit ( 20 ) as well as its inking unit ( 23 ) and dampening unit ( 24 ) for controlling it, wherein: in at least one cylinder ( 21 ) of the printing unit ( 20 ) Temperatures are measured, with a temperature profile over a bale width of the cylinder ( 21 ) temperature signals are generated, the temperature signals to the control device ( 40 ), and the control device ( 40 ) a dampening solution supply of the dampening unit ( 24 ) based on the temperature signals. The method of claim 8, wherein: a color application to a substrate is measured, wherein color signals representing color application are generated, the color signals to the control device ( 40 ), and the control device ( 40 ) an ink supply of the inking unit ( 23 ) based on the temperature signals and the color signals. A method according to claim 9, wherein, in controlling the dampening solution supply, first the dampening solution supply based on in the control device ( 40 ), predetermined ramp-up curves for the dampening solution supply is determined, from the temperature signals time-dependent temperature profiles of the cylinder ( 21 ) of the printing unit ( 20 ) who formed and then the dampening solution supply and their run-up curves are changed on a time-dependent basis on the basis of the temperature profiles. A method according to claim 10, wherein in controlling the ink supply, first the ink supply of the inking unit ( 24 ) on the basis of predetermined, zonal ink quantity distribution ratios of a print image to be printed and in the control device ( 40 ), zonally determined predetermined run-up curves for the ink supply and then the specific ink supply is changed time-dependent based on the time-varying dampening solution and the color signals while maintaining the zonal ink quantity distribution ratios.