DE102009000518A1 - Sheetfed - Google Patents

Abstract

The invention relates to a sheet-fed printing press, with a feeder (11) for feeding sheet to be printed in the sheet-fed press, with at least one printing unit (12) and / or coating unit (13) for printing the sheet with a static, identical for all sheets printed image, with a sheet (14) for discharging printed sheet from the sheet-fed press, and with at least one integrated into the sheet-fed press formless printing device (17, 18, 29, 31-35) for printing the sheet with a particular dynamic, variable printed image. According to the invention, the or each pressure-formless printing device (17, 18, 29, 31-35) is controllably integrated in the sheet-fed printing press depending on process parameters or operating parameters or order parameters or quality parameters.

Description

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

In find sheet-fed presses operating according to the offset printing principle increasingly pressure-free printing devices use, preferably the customization of over offset produced Printed matter with, for example, barcodes, numbering or serves other markings. Such pressure-formless printing devices are also referred to as Non Impact Print (NIP) printing devices and may, for example, be implemented as inkjet printing devices that have at least one inkjet printhead, wherein the or each inkjet printhead according to the so-called continuous inkjet 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 used as laser printing devices be executed.

From the DE 197 04 003 A1 a sheet-fed printing machine is known, in which a designed as an 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 with respect to a sheet-guiding impression cylinder in the area after the passage of sheet is arranged by a pressure gap 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 sheets in the field the sheet trailing edge tend to bounce after leaving the nip and so the distance between the pressure-free printing device and can change the sheet suddenly, which is why the printed sheets without appropriate guide elements against can beat the pressure-formless printing device and Thus, the sheets in the area of the sheet trailing edge not with the like Quality as in the area of a sheet leading edge and / or a sheet center can be printed.

To fix the sheets on the surface of the impression cylinder are in the DE 197 04 003 A1 Bow guide rollers proposed, however, cover areas of the sheet, which is why the press sheet in the printing machine according to DE 197 04 003 A1 can not be printed over the entire format width of the printing formless printing device. Furthermore, the arrangement of the pressure-free printing device in the region of the printing gap implies that imprints are made in freshly printed printed sheets with the help of the pressure-free printing device, whereby the risk exists that the sheet guide rollers used leave markings on the surface of the printed sheets and thus impair the achievable print quality.

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

From the DE 10 2006 002 302 A1 Another sheetfed press 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 sheet with the help of one or more pressure-free printing device at a time, which is before the printing of the sheet in the preferably designed as an offset printing units printing works of Bo gen printing press. 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 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 the DE 10 2006 002 304 A1 is another sheetfed press 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 using the or each druckformlosen device at a time that is clearly after printing the sheet in the preferably designed as offset printing units of the sheet-fed printing press. Since the printed sheets to be printed in the region of the boom are flat and not curved or aligned as in the area of the printing units of the sheet-fed printing machine, the pressure-free Druckeinrichtun can be arranged with a small distance to the sheet without the sheet on the side to be printed on the sheet rolling guide rollers are required, 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 the DE 10 2006 002 312 A1 is another sheetfed press known. In terms 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 presses. A pressure-formless printing device is therefore, if it should be done with the same at an installation position no printing of the sheet, from this installation position disassembled and therefore displaceable. Cleaning and maintenance work on pressure-free printing devices can be carried out independently of the sheet-fed press.

Of these, Based on the present invention, the problem is based to create a novel sheet-fed press.

This Problem is due to a sheet-fed printing machine according to claim 1 solved. According to the invention, the or any printing formless printing device automatically adjustable to the printing conditions.

preferred Further developments of the invention will become apparent from the dependent claims and the description below. Embodiments of the Invention are provided without being limited thereto explained in detail the drawing.

there shows:

1 : a sheet-fed printing press according to a first embodiment of the invention and

2 : a sheet-fed printing press according to a second embodiment of the invention.

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

1 shows a schematic representation of a sheet-fed press according to the invention 10 , the sheet-fed press 10 an investor 11 , several printing units designed as offset printing units 12 , one of the printing works 12 downstream coating unit 13 as well as the coating plant 13 downstream boom 14 includes. The investor 11 is used for transferring to be printed sheet in the sheetfed press 10 , where the printed sheets pass through the printing units 12 as well as the coating plant 13 moved and printed in the same with a print sheet for all the same or constant and therefore static printed image. In the area of the jib 14 Be printed sheets from the sheetfed press to form a delivery pile 15 discharged. In the illustrated embodiment of the 1 is the sheetfed press 10 designed as a so-called turning machine, which serves the two-sided printing of printed sheets in the so-called perfecting. One between the first two printing units 12 arranged transfer cylinder is this as a turning cylinder 16 educated.

In the sheetfed press 10 At least one printing formless printing device is integrated, which preferably serves to print the printed sheet with a dynamic or variable printed image. The or each pressure-formless printing device may be in the area of the investor 11 in the sheetfed press 10 be integrated, with in 1 possible installation positions 17 and 18 for the or each pressure-formless printing device are shown schematically. In both installation positions 17 and 18 The sheets are in the area of the investor 11 Printed from above via the or each printing formless printing device.

In the case in which the investor 11 is designed as a so-called single sheet feeder, is the installation position 18 for each pressure-formless printing device preferred, namely above an investment table 19 about which of a feeder pile 20 lifted printed sheet the first printing unit 12 fed to the printing press. In the area of the investment table 19 For example, the sheets are fed to their underside by at least one suction belt so that the sheets can be printed by the or each non-printing device on an upper side thereof, over the entire format width and format length thereof. When transporting the printing sheets along the investment table 19 the printed 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.

Is in an investor trained as a single sheet investor 11 a pressure-formless printing device in the installed position 18 above a investment table 19 in the investor 11 integrated, this is the installation position along the investment table 19 freely selectable. To control the pressure-formless printing device then at least one leading edge and a side edge of the sheets are recorded and evaluated to print the sheets in the desired zones thereof. The sensors required to detect the leading edge and side edge may be provided via infrared or ultrasonic sensors or capacitive sensors.

In the case in which the investor 11 is designed as a so-called shed feeder, is the installation position 17 preferred for the or each pressure-formless printing device, namely above an in 1 not shown investment sheet of the Schuppenanlegers, wherein the sheet separated and in the area of the contact sheet and a so-called pregripper 21 recorded and the first printing unit 12 the sheetfed press 10 be 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.

Is at a designed as a shed feeder investors 11 a pressure-formless printing device in the installed position 17 adjacent to the pre-gripper 21 in the investor 11 integrated, so at least one leading edge of the sheet must be detected and evaluated to control the printing sheet in the desired zones thereof to control the pressure-formless printing device. The required for detecting the leading edge sensor can be provided in turn via infrared or ultrasonic sensors or capacitive sensors. Between the pressure-free printing device 17 and the pre-gripper 21 a sheet guiding device is preferably positioned which can be displaced into areas or zones of the printed sheets which are not to be printed by the printing formless printing device.

As the sheet is fed into the sheetfed press, it changes over the pregripper 21 the transport speed of the printed sheets, so at least one characteristic is deposited in a control device of the pressure-free printing device, which is dependent on printing material characteristics such as the grammage and / or the fiber direction and / or the rigidity of the printed sheet. 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 sheetfed press 10 Integrated pressure-free printing device is preferably designed as an inkjet printing device, such printing devices seen transversely to the transport direction of the sheet several juxtaposed inkjet printheads and seen in the transport direction of the sheet several inkjet printheads arranged one behind the other arranged array-like or matrix-like and preferably with each other are connected on the control side.

The Number of print heads required across the print direction is primarily due to the desired total print width based on the given print width of the printhead used Are defined.

The required number of printheads in the transport direction the printed sheet, however, is determined by the desired Print speed is greater than the given Print speed of a printhead and the fact that several Printing inks on the printed sheets using the pressure-free printing device should be applied. Furthermore, the number of print heads in the transport direction of the sheet by the desired Print resolution in relation to the given print resolution of the printhead used.

As already mentioned above, the printing units serve 12 as well as the coating plant 13 the sheet-fed printing machine according to the invention 10 of the embodiment of 1 printing the sheet with a static, for all sheets identi rule printed image. The or each one in the investor's field 11 in the sheetfed press 10 integrated printing formless device, however, is used to print the sheet with a dynamic or variable print image, the printing with the dynamic or variable print image inline for printing the sheet with the static image, and in time before printing the sheet in the printing units 12 as well as the coating plant 13 , Furthermore, pressure-free printing devices in installation positions 30 . 31 on printing cylinders 40 in print works 12 be provided. In this case, the pressure-formless printing devices are arranged downstream of a printing gap serving as ink transfer on the printing sheet in the sheet running direction.

Furthermore, also for an installation position 32 on a printing cylinder 40 in a coating plant 13 be provided a pressure-formless printing device. Furthermore, pressure-free printing devices in installation positions 33 . 34 on bow guides 41 in the boom 14 be provided so that they act on the underside of the sheets.

The compression-free printing devices are not intended for use in the 1 shown configuration of a sheet-fed press limited, but they can be used in any sheetfed presses. So shows 2 an application in a sheetfed press 22 , when viewed in the transport direction of the sheet after the investor 11 a designed as a flexographic printing unit 23 and seen in the transport direction of the sheet in front of the boom 14 a coating plant 24 is arranged, and being between the flexo printing unit 23 and the coating plant 24 two drying devices 25 are positioned.

Also in the embodiment of 2 is in the sheetfed press 22 at least one pressure-formless printing device in the region of the investor 11 integrated, namely either in the field of installation position 17 or in the field of installation position 18 so that the comments on the embodiment of the 1 can be referenced. As already in connection with the embodiment of 1 mentioned, is the installation position 17 in a feeder designed as a feeder feeder and the installation position 18 preferred in an investor designed as a single sheet feeder.

Furthermore, printing formless printing devices can also this sheetfed press 22 in installation positions 32 on printing cylinders 40 in the printing units (flexographic printing unit, coating unit) 23 . 24 be provided.

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

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

As well can formless printing devices in sheetfed presses be used, in which the investor as a roll bow investors is trained. The roll sheet feeder includes a sheet cutter and is also referred to as an inline sheet. In the sheet cutter are cut off from a web-shaped printing material The then the first printing unit of the be fed to the following sheet-fed printing machine. In the roll-bow feeder the or each pressure-formless printing device is preferably on which integrates an installation position in the feeder where the bow guided horizontally over a conveying surface are largely accessible from above.

To an advantageous development of the present invention is the or each formless printing device of the sheet-fed press removable, in such a way that the or each druckformlose Printing device on another sheetfed press or within the same sheet-fed press at different installation positions can be used.

For this has the or each pressure-less printing device over a supply-side, namely mechanical or printing-side, and a steue tion side, namely electrical or electronic, interface over which the or each formless Printing device to an ink supply system or to a Control device of the respective printing machine can be connected can.

are in several installation positions pressure-free printing devices in integrated a sheetfed press, so can the electric and mechanical interfaces for these printing devices be centralized. To the or each pressure-less printing device leading supply lines, be it electrical supply lines or mechanical or pressure-side supply lines either on the sheet-fed printing machine according to the invention be permanently installed or mobile to the sheetfed press be introduced. Due to the demountability of or each pressure-formless printing device of the invention Sheetfed press can perform maintenance as well as cleaning at the pressure-free printing devices outside the Be performed area of the sheet-fed press.

In Transport direction of the sheet seen is the pressure-formless Printing device preferably a drying device or curing device and / or downstream of a suction device, wherein the drying device drying the over the pressure-formless printing device applied ink and the suction device the suction of solvent fumes over the pressure-free printing device applied ink used.

The pressure-free printing device is in the area of the investor 11 pivotally mounted, preferably on a pivot arm, on a side frame of the investor 11 or the first printing unit 12 attacks. This is the investor 11 freely accessible for set-up work.

Printing formless printing devices 17 . 18 . 29 . 31 - 35 not only individually in different printing units 12 . 13 but also be provided as a complete multi-color 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 press ne.

The Requirements in today's sheetfed presses are very high designed differently. In the process, from the side of the user a high degree of flexibility both in terms of executable Order types as well as scope and process designs required. This usually also in connection with increasing automation of the systems.

• 1. Anwendung beim Einsatz unterschiedlicher Bedruckstoffstärken. In der Bogenmaschine werden Bedruckstoffe mit 0,04 bis 1,2 mm Materialstärke verarbeitet. Dies bedeutet, dass sich bei der Installation von Inkjet-Druckköpfen in Druckwerken der Bogendruckmaschine jeweils variierende Abstände der Bedruckstoffoberfläche relativ zu einer maschinenfesten Druckkopfposition ergeben. Der Druckkopf kann mit Hilfe eines geeigneten Stellmechanismus hinsichtlich seines Abstandes zur Oberfläche des Bedruckstoffes angepasst werden, so dass immer der gleiche Abstand eingehalten wird. Dies kann als Bedruckstoffstärken-Nachführung bezeichnet werden. Die Ansteuerung kann direkt am System entsprechend Vorgabe des Bedieners erfolgen, es ist aber auch eine Kopplung mit der Maschinensteuerung einer modernen Bogendruckmaschine denkbar, die diese Daten zwecks Druckwerkseinstellung, z. B. bei der Druckbeistellung oder Druckspalteinstellung oder der Anlegereinstellung oder der Greiferauflageneinstellung, etc., ohnehin verarbeiten muss.
• 2. Mit der teilbreiten digitalen Druckfunktion ergibt sich der Bedarf nach einer auftragsbezogenen Positionierung der Druckwerke in der Formatbreite. Dazu ist die Aufnahme der Druckköpfe/des Druckkopfes an einer Traverse vorzu sehen, die das Anfahren beliebiger Positionen erlaubt. Neben der manuellen Einstellung ist auch eine motorisch gestützte und ansteuerbare Positionierung denkbar. Die Ansteuerung kann direkt am System entsprechend Vorgabe des Bedieners erfolgen, es ist aber auch eine Kopplung mit der Maschinensteuerung einer modernen Druckmaschine denkbar, die über Datenleitungen bis hin zur Vorstufe/Druckdatenverarbeitung die genaue Position der Druckzone übermitteln kann.
• 3. Weiterhin ist der Einsatz der/aller digitalen Druckköpfe nicht unbedingt bei jedem Auftrag gegeben. Um Verschmutzung und Einschränkungen in der Bogenführung, Zugänglichkeit, Wartung der Anlage zu vermeiden, ist ein Verfahren und Abschwenken der Druckköpfe möglich.
• 4. In Verbindung mit 3. aber auch als fest installierte Komponente sind ein oder mehrere Druckköpfe vorzusehen, die im Falle von Störungen aktiviert werden können. Die Anordnung macht insbesondere in Verbindung mit einem Inspektionssystem Sinn, dessen Fehlermeldung ggf. den gezielten Einsatz eines Ersatzdruckkopfes an der Stelle defekter Düsen auslöst. Hierbei tastet das Inspektionssystem den erstellten Druckbogen ab, vergleicht das erfasste Druckbild mit einem schon gespeicherten Druckbild und gibt bei Feststellung einer Differenz eine Fehlermeldung aus, die Art und Lage des Fehlers wiedergibt. Ist dabei ein Bildelement eines Inkjet-Druckkopfes von einem Fehler betroffen, kann anstelle des nicht richtig arbeitenden Inkjet-Druckkopfes ein ersatzweise ein anderer Inkjet-Druckkopf zugeschaltet oder umgeschaltet oder in die entsprechende Position gesteuert werden. In diesem Fall ist vorgesehen, ein sofortiges Signal an den Bediener weiterzuleiten, der entsprechende Wartungsmaßnahmen an dem defekten Inkjet-Druckkopf veranlasst.

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

• 1. Application when using different substrate thicknesses. In the sheetfed press, 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 purpose, the recording of the printheads / printhead on a traverse see vorzu, which allows the start of any position. In addition to manual adjustment, motor-assisted and controllable positioning is also conceivable. The control can be done directly on the system according to the operator's instructions, but it is also a coupling with the machine control of a modern printing machine conceivable that can transmit data lines up to the prepress / print data processing, the exact position of the print zone.
• 3. Furthermore, the use of / all digital printheads is not necessarily given for each job. To avoid contamination and restrictions in the sheet guiding, accessibility, maintenance of the system, 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, a replacement inkjet printhead can be switched on or switched over instead of the inkjet printhead working incorrectly, 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.

10

Sheetfed

11

investor

12

printing unit

13

coating unit

14

boom

15

delivery pile

16

turning cylinder

17

pressure formless Print Setup / installation position

18

pressure formless Print Setup / installation position

19

feed table

20

feeder pile

21

pregrippers

22

Sheetfed

23

printing unit

24

coating unit

25

drying device

26

Sheetfed

27

Bow Roll-Schneieinrichtung

28

role

29

pressure formless Print Setup / installation position

30

pressure formless Print Setup / installation position

31

pressure formless Print Setup / installation position

32

pressure formless Print Setup / installation position

33

pressure formless Print Setup / installation position

34

pressure formless Print Setup / installation position

35

pressure formless Print Setup / installation position

40

pressure cylinder

41

Sheet guiding device

42

Sheet guiding device

QUOTES INCLUDE IN THE DESCRIPTION

This list The documents listed by the applicant have been automated generated and is solely for better information recorded by the reader. The list is not part of the German Patent or utility model application. The DPMA takes over no liability for any errors or omissions.

Cited patent literature

• - DE 19704003 A1 [0003, 0003, 0005, 0005]
• - DE 19514259 A1 [0006]
• DE 102006002302 A1 [0007]
• DE 102006002304 A1 [0008]
• DE 102006002312 A1 [0009]

Claims (12)

Sheet-fed press, with a feeder ( 11 ), with at least one printing unit ( 12 ; 23 ) and / or coating unit ( 13 ; 24 ) for printing on the printed sheets with a static, identical for all sheets printed image, with a boom ( 14 ) for discharging printed sheet from the sheet-fed press, and at least one integrated with the sheet-fed press, formless printing device ( 17 . 18 ; 29 ; 31 - 35 ) for printing the printed sheets with a particularly 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 printing machine with an adjustable receiving device, wherein the or each pressure-formless printing device ( 17 . 18 ; 29 ; 31 - 35 ) is integrated adjustable and / or positionable as a function of the type of printing material and / or the printing subject. Sheet-fed printing machine according to claim 1, characterized in that the or each pressure-formless printing device ( 17 . 18 ; 29 ; 31 - 35 ) with respect to one on a printing cylinder ( 40 ) is arranged and adjustable with respect to the surface of the sheet, the adjustment being carried out in dependence on parameters which are input to the sheet-fed press for the processing of a print job. 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 ) with respect to one on a printing cylinder ( 40 ) and adjustable with respect to the surface of the sheet in the direction of its width and length, wherein the adjustment is carried out in dependence on parameters which are input to the sheet-fed printing machine for the processing of a print job. 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 ) with respect to one on a printing cylinder ( 40 ) held sheet and compared to the impression cylinder ( 40 ) is movable and adjustable, the positions and settings being controlled in dependence on the operating state of the sheet-fed press. 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 ) with respect to one on a printing cylinder ( 40 ) held sheet and compared to the impression cylinder ( 40 ) is movable and adjustable, wherein the positions and settings depending on quality characteristics of the sheet produced in the sheet-fed press is controlled. Sheet-fed printing machine according to claim 5, characterized in that the or each pressure-formless printing device ( 17 . 18 ; 29 ; 31 - 35 ) is traversable and adjustable on the basis of error signals, wherein error signals are generated by an inspection device which generates a print image from a pressure-formless printing device ( 17 . 18 ; 29 ; 31 - 35 ) and compares it with a template. 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 ) can be switched on the basis of the error signals, switched off and in the position opposite to the printing plane and in its extension is changeable. 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 to a position of a malfunctioning pressure-free printing device ( 17 . 18 ; 29 ; 31 - 35 ) can be positioned and operable with the required printing and image parameters at the new position. 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 ) at least one characteristic is deposited, which is dependent on printing material parameters such as the grammage and / or the fiber direction and / or the stiffness of the printed sheet, wherein the pressure-formless printing device ( 17 . 18 ; 29 ; 31 - 35 ) is controllable on the basis of these characteristics. 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 sheets are printable over the entire format width and / or format length of the or each printing formless printing device. Sheet-fed printing machine according to claim 10, characterized in that the or each pressure-formless printing device ( 17 . 18 ; 29 ; 31 - 35 ) seen transversely to the transport direction of the sheet seen a plurality of juxtaposed inkjet printheads and / or seen in the transport direction of the sheet several inkjet printheads arranged one behind the other, which are interconnected on the control side. Sheetfed press after one or more of claim 1 to 11, characterized in that the or each pressure-formless printing device ( 17 . 18 ; 29 ; 31 - 35 ) printed the sheets before the static printing them in the or each printing unit and / or in the or each coating unit dynamic or individualizing.