WO2010086204A1

WO2010086204A1 - Sheet-fed printing press

Info

Publication number: WO2010086204A1
Application number: PCT/EP2010/050203
Authority: WO
Inventors: Rudolf NÄGELE; Robert Weiss; Peter Schulmeister; Dietmar Stahl; Johannes Tenfelde; Andreas Lippold; Rainer Gebhardt
Original assignee: Manroland Ag
Priority date: 2009-01-30
Filing date: 2010-01-11
Publication date: 2010-08-05
Also published as: DE102009000518B4; DE102009000518A1

Abstract

The invention relates to a sheet-fed printing press comprising a feeding mechanism (11) for introducing sheets that are to be printed into the sheet-fed press, at least one printing couple (12) and/or coating unit (13) for printing the sheets with a static printed image that is identical for all printed sheets, a discharging mechanism (14) for discharging printed sheets from the sheet-fed press, and at least one printing device (17, 18; 29; 31-35) which includes no printing form and is integrated into the sheet-fed press to print the sheets with an especially dynamic, variable printed image. According to the invention, the or each printing device (17, 18; 29; 31-35) that includes no printing form is integrated into the sheet-fed press so as to be controllable in accordance with process parameters, operating parameters, job parameters, or quality parameters.

Description

Sheetfed

The invention relates to a sheet-fed printing machine according to the preamble of claim 1.

In sheet-fed printing presses working according to the offset printing principle, use is increasingly being made of printing-form-free printing devices which are preferably used to individualize printed products produced by offset printing with, for example, barcodes, numbering or other markings. Such pressure-formless printing devices are also referred to as non-impact print (NIP) printing devices and can be embodied, for example, as inkjet printing devices which have at least one inkjet print head, the or each inkjet print head being printed according to the so-called continuous ink jet printer. Principle, the drop-on-demand inkjet principle, the thermal inkjet principle or any other inkjet principle can work. The pressure-formless or NIP printing devices can also be designed as laser printing devices.

From DE 197 04 003 A1, a sheet-fed printing machine is known, in which a form of inkjet printing device or as a laser printing device, pressure-free printing device is integrated in an offset printing unit of the sheet-fed press. In this case, the pressure-formless printing device is arranged opposite a sheet-guiding impression cylinder in the region after the passage of the printed sheet through a printing nip formed by the impression cylinder and a blanket cylinder. In the printing machine according to DE 197 04 003 A1, in particular the printing of printed sheets with a high rigidity in the area of the inkjet printing device or laser printing device is problematic.

This is due to the fact that such printed sheets in the region of the sheet trailing edge after leaving the printing nip tend to bounce and so that the distance between the pressure-free printing device and the sheet can change abruptly, which is why the sheet can strike without corresponding guide elements against the pressure-free printing device and thus the sheets in the sheet trailing edge are not printed with the same quality as in the area of a sheet leading edge and / or a sheet center can.

In order to fix the printed sheets on the surface of the counter-pressure cylinder, DE 197 04 003 A1 proposes sheet-guiding rollers which, however, cover areas of the printed sheets, which is why the printing sheets in the printing press according to DE 197 04 003 A1 do not extend over the entire format width of the printing-form-free printing device can be printed. Furthermore, the arrangement of the pressure-free printing device in the region of the printing gap implies that impressions are made in the freshly printed printed sheets with the help of the pressure-free printing device, whereby the risk exists that the sheet guiding rollers used leave markings on the surface of the printed sheets and thus impair the achievable print quality.

Another sheet-fed printing machine with an integrated, pressure-formless printing device is known from DE 195 14 259 A1, seen in this state of the art pressure-free printing device in the transport direction of the sheet seen behind the last offset printing unit and in the transport direction of the sheet before a boom of the sheet-fed press is integrated into the same.

From DE 10 2006 002 302 A1 a further sheet-fed printing machine is known. For the purposes of the device described therein, it is proposed to integrate one or each pressure-formless printing device in the area of an investor of a sheet-fed printing machine into the same. Accordingly, in the context of this publication, the printing of printed sheets takes place with the aid of one or more printing-form-free printing devices at a point in time before the printing of the printed sheets in the printing units of the press, which are preferably in the form of offset printing units. is located. Since the printed sheets to be printed in the region of the investor are flat and not curved or aligned as in the area of the printing units of the sheet-fed printing press, the printing formless printing devices can be arranged at a small distance from the printed sheet, without rolling on the sheet to be printed on the sheet Sheet guiding rollers are required which, on the one hand, impair the print quality and, on the other hand, limit the width of the printed sheets which can be printed in the region of the or each printing-form-free device.

From DE 10 2006 002 304 A1 a further sheet-fed printing machine is known. For the purposes of the device described therein, it is proposed to integrate one or more pressure-free printing devices in the region of a boom of a sheet-fed printing machine into the same. Accordingly, in the context of this publication, the printing of printed sheets with the help of the or each druckformlo- sen device at a time that is clearly after printing the sheet in the preferably designed as offset printing units printing units of the sheet-fed press. Since the printed sheets to be printed in the region of the cantilever plane and not curved or aligned as in the printing presses of the sheet-fed press, the printing forme printing devices can be arranged with a small distance to the sheet without rolling on the printing side of the sheet Sheet guide rollers are required, which on the one hand affect the print quality and on the other hand limit the printable in the range of or any pressure-free device width of the sheet.

From DE 10 2006 002 312 A1 a further sheet-fed printing machine is known. In the sense of the device described there, one or more pressure-free printing devices are designed to be mobile or displaceable, so that they can be used on the one hand within the same sheet-fed printing machine at different installation positions and on the other hand on different sheet-fed printing machines. A pressure-formless printing device is therefore when no printing of the printed sheet is to take place with the same at an installation position, Removable from this installation position and therefore displaceable. Cleaning and maintenance work on pressure-free printing devices can be carried out independently of the sheet-fed press.

On this basis, the present invention is based on the problem to provide a novel sheet-fed printing machine.

This problem is solved by a sheet-fed printing machine according to claim 1. According to the invention, the or each pressure-formless printing device is automatically adjustable to the printing conditions.

Preferred embodiments of the invention will become apparent from the dependent claims and the description below. Embodiments of the invention will be described, without being limited thereto, with reference to the drawings.

Showing:

Fig. 1: a sheet-fed printing machine according to the invention according to a first embodiment of the invention and Fig. 2: a sheet-fed printing machine according to the invention according to a second embodiment of the invention.

Hereinafter, the present invention will be described in more detail with reference to FIGS. 1 to 3.

Fig. 1 shows a schematic representation of a sheet-fed printing machine 10, wherein the sheet-fed printing machine 10 comprises a feeder 11, a plurality formed as offset printing units printing units 12, a printing units 12 downstream coating unit 13 and a coating unit 13 downstream boom 14. The feeder 11 is used for feeding sheet to be printed in the sheet-fed press 10, wherein the sheet is moved through the printing units 12 and the coating unit 13 and in the same with one for all Printing sheet same or unchanging and thus printed static image. In the area of the arm 14, printed signatures are discharged from the sheet-fed printing press to form a delivery stack 15. In the illustrated embodiment of FIG. 1, the sheet-fed printing machine 10 is formed as a so-called turning machine, which serves the two-sided printing of printed sheets in the so-called perfecting. A arranged between the first two printing units 12 transfer cylinder is this formed as a turning cylinder 16.

In the sheet-fed printing machine 10, at least one pressure-formless printing device is integrated, which preferably serves to print the printed sheet with a dynamic or variable print image. The or each pressure-formless printing device can be integrated in the area of the feeder 11 in the sheet-fed press 10, wherein in Fig. 1 possible installation positions 17 and 18 are shown schematically for the or each pressure-formless printing device. In both installation positions 17 and 18, the printed sheets are printed in the region of the feeder 11 via the or each pressure-formless printing device from above.

In the case in which the feeder 11 is configured as a so-called single-sheet feeder, the installation position 18 is preferred for each pressure-formless printing device, namely above an investment table 19, via which printed sheets lifted from an feeder stack 20 are fed to the first printing unit 12 of the printing press. In the area of the investment table 19, the printed sheets are guided on their underside by at least one suction belt, so that the printing sheets of the or each printing forme printing device on an upper side thereof are printable, namely over the entire format width and format length thereof. When transporting the printing sheet along the investment table 19, the sheets are flat or flat. It can be maintained a small distance between the or each pressure-free printing device and the sheet and thus a high print quality can be provided. If, in the case of a feeder 11 configured as a single-sheet feeder, a pressure-form-free printing device is integrated into the feeder 11 in the installation position 18 above an investment table 19, the installation position along the investment table 19 can be freely selected. To control the printing forme printing device then at least a leading edge and a side edge of the sheet must then be detected and evaluated to print the sheets in the desired zones thereof. The sensor system required for detecting the leading edge and side edge can be provided via infrared or ultrasonic sensors or capacitive sensors.

In the case in which the feeder 11 is designed as a so-called flake feeder, the installation position 17 is preferred for the or each pressure-formless printing device, namely above a contact plate of the flaker feeder, not shown in FIG. 1, wherein the printed sheets are arranged in the region of the contact plate and detected by a so-called pre-gripper 21 and the first printing unit 12 of the sheet-fed printing machine 10 are supplied. Also in this case, the printed sheets of the or each printing formless printing device over the entire format width and format length can be printed with a dynamic or variable printed image.

If, in the case of a feeder 11 constructed as a bulkhead feeder, a printing formless printing device is integrated in the installation position 17 adjacent to the pre-gripper 21 in the feeder 11, at least one leading edge of the printed sheet must be detected and evaluated in order to control the printing formless printing device in the desired zones thereof to print. The required for detecting the leading edge sensor can be provided in turn via infrared or ultrasonic sensors or capacitive sensors. Between the pressure-formless printing device 17 and the pre-gripper 21, a sheet guiding device is preferably positioned which can be displaced into regions or zones of the printed sheets which are not to be printed by the printing-formless printing device. If the transport speed of the printed sheets changes over the pre-gripper 21 when the sheet is fed into the sheet-fed printing press, then at least one characteristic curve is stored in a control device of the printing-form-free printing device which depends on substrate characteristics such as the grammage and / or the grain direction and / or the stiffness of the sheet Printed sheet is. The pressure-formless printing device is then controlled based on one of these characteristics. The characteristic curves are determined in advance for printed sheets from different substrates.

The or each in the sheet-fed printing machine 10 integrated pressure-free printing device is preferably designed as an inkjet printing device, said printing devices seen transversely to the transport direction of the sheet several juxtaposed inkjet printheads and seen in the transport direction of the sheet have several successively arranged inkjet printheads, the arranged in an array-like or matrix-like manner to each other and preferably interconnected on the control side.

The number of print heads required transversely to the printing direction is primarily defined by the desired total print width relative to the given print width of the print head used.

The required number of printheads in the transport direction of the sheet is, however, determined by the fact that the desired printing speed is greater than the given printing speed of a printhead and in that a plurality of inks are to be applied to the sheets by means of pressure-free printing device. Furthermore, the number of print heads in the transport direction of the print sheets is defined by the desired print resolution in relation to the given print resolution of the print head used.

As already mentioned above, the printing units 12 and the coating unit 13 of the sheet-fed printing press 10 according to the invention of the embodiment of FIG. 1 serve to print the printed sheets with a static, identical for all printed sheets. see print image. On the other hand, the printing-form-free device integrated in the sheet-fed printing press 10 in the area of the feeder 11 serves to print the printed sheet with a dynamic or variable print image, printing with the dynamic or variable print image inline for printing the printed sheet with the static print image In addition, pressure-free printing devices can be provided in installation positions 30, 31 on printing cylinders 40 in printing units 12. In this case, the printing-form-free printing devices are arranged downstream of the printing nip in the direction of sheet travel in relation to the transfer of ink to the printed sheets.

Furthermore, it can also be provided for a mounting position 32 on a printing cylinder 40 in a coating unit 13, a pressure-formless printing device. Furthermore, pressure-formless printing devices in installation positions 33, 34 may be provided on sheet guides 41 in the boom 14, so that they act on the underside of the sheet.

The pressure-free printing devices are not limited to use in the configuration of a sheet-fed press shown in FIG. 1, but rather they can be used in any sheet-fed printing presses. Thus, Fig. 2 shows an application in a sheet-fed press 22, in the transport direction of the sheet seen after the feeder 11 designed as a flexographic printing unit 23 and seen in the transport direction of the sheet before the boom 14, a coating unit 24 is arranged, and wherein between the flexographic printing 23 and the coating unit 24 two drying devices 25 are posi- tioned.

2, at least one pressure-formless printing device is integrated into the sheet-fed printing machine 22 in the region of the feeder 11, namely either in the area of the installation position 17 or in the region of the installation position 18, so that reference is made to the explanations concerning the exemplary embodiment of FIG can be. As already mentioned in connection with the embodiment of FIG. 1, the installation position 17 is at a as a bulkhead feeder trained investors and the mounting position 18 in a trained as a single sheet feeder investors preferred.

Furthermore, printing-form-free printing devices can also be provided for this sheet-fed printing machine 22 in installation positions 32 on printing cylinders 40 in the printing units (flexographic printing unit, coating unit) 23, 24.

Furthermore, pressure-formless printing devices may be provided in an installed position 35 on sheet guides 42 in the boom 14 so that they act on the printed sheets from the top.

The variants for the arrangement of pressure-formless printing devices in the boom 14 according to FIGS. 1 and 2 are also possible in each case in the other embodiment shown here in all machine configurations.

Likewise, pressure-formless printing devices can be used in sheet-fed presses, in which the feeder is designed as a roll-bow feeder. The roll sheet feeder includes a sheet cutter and is also referred to as an inline sheeter. In the sheet-cutting device, printing sheets are cut from a web-shaped printing material, which are then fed via a feed table to the first printing unit of the following sheet-fed printing press. In the roll-bow feeder is the or each pressure-less

Printing device preferably integrated at the one installation position in the feeder, where the sheets are guided horizontally over a conveying surface and are largely accessible from above.

According to an advantageous development of the present invention, the or each pressure-formless printing device of the sheet-fed printing machine can be disassembled, in such a way that the or each pressure-formless printing device can be used on a different sheet-fed press or within the same sheet-fed press at different mounting positions.

For this purpose, the or each pressure-formless printing device has a supply-side, namely mechanical or printing-color-side, and a stepless tion side, namely electrical or electronic, interface, via which the or any pressure-free printing device can be connected to an ink supply system or to a control device of the respective printing press.

If pressure-free printing devices are integrated into a sheet-fed printing machine at several installation positions, then the electrical and mechanical interfaces for these printing devices can be centralized. To the or each pressure-formless printing device leading supply lines, be it electrical supply lines or mechanical or pressure-color side supply lines can either be permanently installed on the sheet-fed press according to the invention or be brought to the sheet-fed press mobile. By the disassembly of the or each printing formless printing device of the sheet-fed printing machine according to the invention maintenance and cleaning work can be performed on the printing formless printing devices outside the range of the sheet-fed press.

When viewed in the direction of transport of the printing sheet, the printing formless printing device is preferably arranged downstream of a drying device or curing device and / or a suction device, wherein the drying device serves to dry the printing ink applied via the printing formless printing device and the suction device to remove solvent vapors from the ink applied via the printing plate free printing device.

The pressure-formless printing device is arranged pivotably in the region of the feeder 11, preferably on a swivel arm which engages on a side frame of the feeder 11 or of the first printing unit 12. As a result, the feeder 11 is freely accessible for setup work.

Compression-free printing devices 17, 18, 29, 31-35 can be provided not only individually in different printing units 12, 13 but also as complete multicolor printing units in individual printing units. The present invention enables the use of high-quality digital printing systems, in particular inkjet printing in the environment of a sheet-fed printing machine.

The requirements in today's sheetfed presses are designed very differently. In this case, the user demands a high degree of flexibility with regard to the executable order types as well as scope and process designs. This usually also in connection with increasing automation of the systems.

To take account of this situation, the following measures are provided according to the invention:

1. Application when using different substrate thicknesses. In the sheet forming machine, substrates with 0.04 to 1.2 mm material thickness are processed. This means that in the installation of inkjet printheads in printing units of the sheet-fed press each result in varying distances of the printing surface relative to a machine-fixed printhead position. The printhead can be adjusted by means of a suitable adjusting mechanism with respect to its distance from the surface of the printing material, so that the same distance is always maintained. This can be referred to as printing stock strength tracking. The control can be done directly on the system according to the operator, but it is also a coupling with the machine control of a modern sheetfed press conceivable that this data for the purpose of printing unit setting, z. B. in the printing job or pressure nip adjustment or the investor setting or the gripper pad adjustment, etc., must process anyway.

2. With the partial width digital printing function there is the need for an order-related positioning of the printing units in the format width. For this, the recording of the printheads / printhead on a crossbeam is to be carried out. see that allows the approach of any positions. In addition to manual adjustment, motor-assisted and controllable positioning is also conceivable. The control can be carried out directly on the system according to the operator's instructions, but it is also conceivable to couple it with the machine control of a modern printing press, which can transmit the exact position of the print zone via data lines up to prepress / print data processing.

3. Furthermore, the use of / all digital printheads is not necessarily given for each job. To pollution and restrictions in the

Bowing, accessibility, maintenance of the system is avoided, a process and pivoting of the printheads is possible.

4. In conjunction with 3. but also as a permanently installed component, one or more print heads must be provided, which can be activated in the event of faults. The arrangement makes sense especially in connection with an inspection system whose error message possibly triggers the targeted use of a replacement print head at the location of defective nozzles. Here, the inspection system scans the printed sheet created, compares the captured print image with an already stored print image and outputs when finding a difference an error message that reflects the nature and location of the error. If a picture element of an inkjet printhead is affected by an error, instead of the inkjet printhead working incorrectly, a replacement inkjet printhead can be switched on or switched over, or it can be controlled to the appropriate position.

In this case, it is provided to forward an immediate signal to the operator, who causes appropriate maintenance on the defective inkjet printhead. LIST OF REFERENCE NUMBERS

10 sheet-fed press

11 investors

12 printing unit

13 coating unit

14 outriggers

15 delivery pile

16 turning cylinders

17 pressure-free printing device / installation position

18 pressure-free printing device / installation position

19 investment table

20 investor stacks

21 pre-grippers

22 sheetfed press

23 printing unit

24 coating unit

25 drying device

26 sheetfed press

27 sheet-roll snowing device

28 roll

29 pressure-free printing device / installation position

30 pressure-free printing device / installation position

31 pressure-free printing device / installation position

32 pressure-free printing device / installation position

33 pressure-free printing device / installation position

34 pressure-free printing device / installation position

35 pressure-free printing device / installation position

40 impression cylinders

41 sheet guiding device

42 sheet guiding device

Claims

claims

1. sheet-fed printing machine, with a feeder (11), with at least one printing unit (12; 23) and / or coating unit (13; 24) for printing the sheet with a static, identical for all sheets printed image, with a boom (14) for Exporting printed sheet from the sheet-fed printing machine, and with at least one integrated pressure-free printing device (17, 18, 29, 31-35) for printing the sheet with a particular dynamic, variable printed image, characterized in that the or each pressure-formless printing device (17, 18; 29; 31-35) is mounted within the sheet-fed press with an adjustable pick-up device, wherein the or each formless printing device (17, 18; 29; 31-35) adjustable depending on the type of printing material and / or Drucksujet is integrated or positionable.

2. Sheet-fed printing machine according to claim 1, characterized in that the or each pressure-formless printing device (17, 18; 29; 31-35) is arranged relative to a printing cylinder (40) held sheet and adjustable with respect to the surface of the printing sheet wherein the adjustment is made in response to parameters input to the sheet-fed press for processing a print job.

A sheet-fed press according to claim 1 or 2, characterized in that the or each printing-formless printing device (17, 18; 29; 31-35) is arranged with respect to a signature held on a printing cylinder (40) and directed towards the surface of the signature of which width and length is adjustable, wherein the adjustment is performed in dependence on parameters that the sheet-fed press for the

Editing a print job can be entered.

4. Sheet-fed printing machine according to claim 1 or 2, characterized in that the or each pressure-formless printing device (17, 18; 29; 31-35) arranged with respect to a printing cylinder (40) held sheet and with respect to the pressure cylinder (40) - Is bar and adjustable, the positions and settings depending on the operating state of the sheet-fed press is controlled.

5. Sheet-fed printing machine according to claim 1 or 2, characterized in that the or each pressure-formless printing device (17, 18; 29; 31-35) arranged with respect to a pressure cylinder (40) held sheet and with respect to the pressure cylinder (40) movable and adjustable, the positions and settings being controlled in dependence on quality characteristics of the sheets produced in the sheet-fed press.

6. Sheet-fed printing press according to claim 5, characterized in that the or each pressure-formless printing device (17, 18; 29; 31-35) is movable and adjustable on the basis of error signals, wherein error signals are generated by an inspection device which is a printed image with a pressure-formless printing device (17, 18;

29; 31 - 35) and compares them with a template.

7. sheet-fed printing machine according to claim 5 and 6, characterized in that the or each pressure-formless printing device (17, 18; 29; 31-35) on the basis of the error signals switched on, off and in the position opposite to the printing plane and in its extension is variable ,

8. Sheet-fed printing machine according to claim 5 and 6, characterized in that the or each pressure-formless printing device

(17, 18; 29; 31-35) based on the error signals to a position of an improperly functioning pressure-free printing device (17, 17; 18; 29; 31-35) can be positioned and operated with the required printing technology and picture content parameters at the new position.

9. sheet-fed printing machine according to claim 1 to 7, characterized in that in a control device of the pressure-formless printing device (17, 18; 29; 31 - 35) deposited at least one characteristic which depends on printing material characteristics such as the grammage and / or the fiber direction and / or the stiffness of the printed sheet is, wherein the pressure-formless printing device (17, 18; 29; 31-35) can be controlled on the basis of these characteristics.

10. Sheet-fed printing machine according to one or more of claims 1 to 9, characterized in that the or each pressure-formless printing device (17, 18; 29; 31-35) is designed as an inkjet printing device, wherein the printed sheets over the entire format width and / or Format length of the or any printing formless printing device are printable.

11. Sheet-fed printing machine according to claim 10, characterized in that the or each pressure-formless printing device (17, 18; 29; 31-35) viewed transversely to the transport direction of the print sheet a plurality of juxtaposed inkjet printheads and / or seen in the transport direction of the print sheet a plurality of successively arranged Inkjet printheads having the control side interconnected.

Sheet-fed printing machine according to one or more of claims 1 to 11, characterized in that the or each printing device without printing (17, 18; 29; 31-35) the printed sheets before the static printing of the same in the or each printing unit and / or in the or each coating unit printed dynamically or individualizing.