EP3890978B1 - Printing press with inspection device and method for manufacturing security documents or their intermediate products - Google Patents

Description

The invention relates to a printing machine, in particular a security printing machine, and a method for producing security products or security intermediate products according to claim 1 or 12.

through the WO 2016/071870 A1 a printing press is known, by means of which a sheet-like substrate guided on a transport path can be successively printed on both sides in multi-color printing at two printing points spaced apart in the transport path. The multi-color printing is carried out by a respective collecting printing unit in such a way that the partial print images of several forme cylinders are collected on one color collecting cylinder before they are delivered together to the substrate at the printing point.

the EP 1 980 393 A1 relates to a method and a system for the production of z. B. Securities, where in several subsequent processes, for example, including offset printing, screen printing, number printing and painting is carried out. the DE 103 32 212 A1 relates to a security printing machine with a numbering printing unit for numbering the banknotes printed on the sheets or at least one marking device by which sheets recognized as faulty can be marked as waste. A first and a second inspection device with an image sensor and an incident light source for inspecting the front and back are provided upstream of the numbering or marking. In addition, a further inspection device can be provided which has an image sensor and a transmitted light source for transilluminating the includes sheets to be examined and, for example, enables inspections of watermarks or the register of front and back prints on the sheets in relation to one another.

the WO 2012/059861 A1 discloses an inspection device in which, in one embodiment, a transmitted light inspection and two incident light inspections take place one after the other. The proposed solution concerns the use of a light-emitting organic surface on the transport cylinder of the transmitted light inspection. In an example for use in a printing press, such a light-emitting organic surface is provided on the way to the delivery in order to inspect the sheets to be deposited.

the CN 204 249 518 U discloses an offset printing machine for securities printing with an inspection device on both sides for inspecting watermarks, holograms, security lines or mother-of-pearl printing contained in the paper. The inspection devices comprise infrared cameras located opposite one another on the transport path.

the WO 2015/118447 A2 relates to a letterpress, in particular numbering, printing machine and is directed to a special solution for a printing group in which two numbering cylinders directly cooperating with an impression cylinder receive the ink from the same ink collecting cylinder. In a further refinement, it could be considered to combine the pressure group with an upstream inspection device. Such an inspection device can include a front and a rear reflected light inspection and a transmitted light inspection.

the EP 2 484 523 A1 discloses a printing machine with an offset printing unit for printing a master pattern. A first inspection unit for the sheet quality with a first and a second camera is provided between the sheet feed device and the offset printing unit Color camera to capture images of watermarks, holograms, "pearl print" or "security wire". There is further provided a second sheet quality inspection unit having a first camera directed to one side of a sheet passed over a transfer cylinder and a second camera directed to the other side of a sheet passed over a transfer cylinder, each comprising an ultraviolet camera to absorb security fibers contained in the printing material.

the WO 2020/052935 A1 (post-published) discloses in one of its variants a reflection and transmission device in a transfer unit designed as an inspection unit, such a transfer unit being able to be provided between processing units, after the last processing unit or between the substrate feed and the subsequent first processing unit.

The invention is based on the object of creating a printing machine and a method for producing securities products or securities intermediate products.

The object is achieved according to the invention by the features of claims 1 and 12, respectively.

The advantages that can be achieved with the invention consist, in particular, in the fact that the risk of producing incorrect security copies is reduced. The advantage arises from the fact that defective sections or sheets of printing material can be recognized and ejected before the first printing. In this case, security features contained in the unprinted securities printing material are easier to recognize in the still unprinted state than after initial printing in a first printing process, through which the printing material z. B. is provided with a high area coverage with a background motif or a background gradient.

For this purpose, a first printing point of a first printing process is at least one Inspection facility upstream. There is one after the Transmitted light method working transmission inspection device is provided, through which the still unprinted substrate is or can be checked for security features contained in or on the substrate. IR radiation is used here.

According to the invention, a reflection inspection device is also provided before the first printing point or before the first printing, by means of which the still unprinted printing material is or can be checked for security features contained in or on the printing material. UV radiation is used for this. The still unprinted substrate is completely unprinted, i. H. not even substrate that has been printed in a previous process.

An embodiment is particularly advantageous in which a transmission inspection device and a reflection inspection device are provided on the transport path of the same transport cylinder.

A printing machine suitable for implementing the invention, in particular a security printing machine, for the production of security products or security intermediate products comprises a feed device for feeding unprinted printing material into the printing machine, a plurality of printing units, through which the unprinted printing material can be printed on one or more printing points on both sides in one or more colors in an indirect planographic printing process or an indirect letterpress printing process simultaneously with the printed images of several forme cylinders, with a conveying section between the feed device and the first printing point arranged in the printing material path two inspection devices are provided for inspecting the still unprinted substrate. A product display, for example, is provided in the printing material path downstream of the at least one printing point, by means of which the printed printing material can be combined into bundles as securities products or securities intermediate products.

In the manufacture of securities products or securities intermediate products - e.g. B. for printing the background - a still unprinted substrate is fed in on the input side, the substrate is printed in a first printing process at a first printing point in the substrate path on one or both sides, and downstream of the printing is combined into bundles at a product display, with the before the first printing point is reached, the still unprinted substrate is checked by two inspection devices for security features that are already contained in the still unprinted substrate.

Other developments that can be added individually or in combination to the basic idea of the invention can be found in the subclaims and the exemplary embodiments individually or in any combination.

Exemplary embodiments of the invention are shown in the drawings and are described in more detail below.

Fig. 1

ein erstes Ausführungsbeispiel für eine Druckmaschine mit einer Druckgruppe in erster Ausführung;

Fig. 2

eine vergrößerte Darstellung der Druckgruppe in erster Ausführung aus Fig. 1;

Fig. 3

einen die Inspektionseinrichtungen umfassenden Ausschnitt der der ersten Druckstelle der Druckgruppe in erster Ausführung vorgeordneten Förderstrecke;

Fig. 4

eine vergrößerte Darstellung einer Druckgruppe in einer zur ersten Ausführung alternativen zweiten Ausführung;

Fig. 5

einen die Inspektionseinrichtungen umfassenden Ausschnitt der der Druckstelle der Druckgruppe in zweiter Ausführung vorgeordneten Förderstrecke;

Fig. 6

eine vergrößerte Darstellung einer Druckgruppe in einer zur ersten und zweiten Ausführung alternativen dritten Ausführung;

Fig. 7

einen die Inspektionseinrichtungen umfassenden Ausschnitt der der Druckstelle der Druckgruppe in dritten Ausführung vorgeordneten Förderstrecke;

Fig. 8

ein zweites Ausführungsbeispiel für eine Druckmaschine mit einer Druckgruppe;

Fig. 9

eine vergrößerte Darstellung einer Druckgruppe aus Fig. 8;

Fig. 10

einen die Inspektionseinrichtungen umfassenden Ausschnitt der der ersten Druckstelle der Druckgruppe aus Fig. 8 bzw. Fig. 9 vorgeordneten Förderstrecke;

Fig. 11

eine vergrößerte Seitenansicht für die Anordnung der Inspektionseinrichtung(en) zu den Ausführungen der Fig. 3, Fig. 5, Fig. 7 und Fig. 10;

Fig. 12

eine Schnittansicht durch eine als Transmissionsinspektionseinrichtung ausgeführte Inspektionseinrichtung;

Fig. 13

eine Schnittansicht durch eine als Reflexionsinspektionseinrichtung ausgeführte Inspektionseinrichtung;

Fig. 14

einen Ausschnitt der der ersten Druckstelle vorgeordneten Förderstrecke mit einer alternativen Anordnung der Transmissionsinspektionseinrichtung;

Fig. 15

einen Ausschnitt der der ersten Druckstelle vorgeordneten Förderstrecke mit einer Variante zur alternativen Anordnung aus Fig. 14.

Show it:

1

a first embodiment of a printing machine with a printing group in the first embodiment;

2

an enlarged view of the pressure group in the first version 1 ;

3

a section of the conveying path upstream of the first printing point of the printing group in the first embodiment, comprising the inspection devices;

4

an enlarged view of a pressure group in an alternative to the first embodiment second embodiment;

figure 5

a section of the conveying line upstream of the printing point of the printing group in the second embodiment, which includes the inspection devices;

6

an enlarged view of a pressure group in an alternative to the first and second embodiment third embodiment;

7

a section of the conveying section upstream of the printing point of the printing group in the third embodiment, which includes the inspection devices;

8

a second embodiment of a printing press with a printing group;

9

an enlarged view of a pressure group 8 ;

10

a section of the first printing station of the printing group, which includes the inspection facilities 8 respectively. 9 upstream conveyor line;

11

an enlarged side view for the arrangement of the inspection device (s) to the versions of the 3 , figure 5 , 7 and 10 ;

12

a sectional view through an inspection device designed as a transmission inspection device;

13

a sectional view through an inspection device designed as a reflection inspection device;

14

a section of the conveyor section upstream of the first printing point with an alternative arrangement of the transmission inspection device;

15

shows a section of the conveyor section upstream of the first printing point with a variant of the alternative arrangement 14 .

A printing press, in particular a printing press that prints on sheet-like printing material 02, comprises a feed system 01 on the input side, e.g. B. a sheet feeder 01 or, if applicable, a roll unwinder with a subsequent cross-cutting device, through which the printing press is supplied with printing material 02 on the input side, one or more printing units 06; 07; 08; 09, through which the sheet-like printing material 02, or printing material sheet 02 for short, can be printed or is printed on one or more times in one or more colors on one or both sides, and a product display 04, e.g. B. pile delivery 04 or, if applicable, a roll winder, on which the printed printing material sheets 02 or webs are processed as products or intermediate products into bundles, e.g. B. be laid out or wound up as a stack or rolls (see e.g. 1 and 8 ). In the embodiment that is preferred here and shown in the figures, the printing machine is designed as a securities printing machine and z. B. designed for this purpose, in particular still unprinted sheets of printing material 02, in short sheets 02, in particular for the production of security sheets 02, with a plurality of copies, e.g. B. printed images of individual banknotes, per sheet 02, as products or intermediate products to be further processed. The printing material sheets 02 are downstream in the Stack display 04 can be laid out on one or preferably several stacks. The stack delivery 04 preferably comprises several, e.g. B. at least or exactly three stacking spaces to form a corresponding number of stacks, wherein preferably at least one of the stacking spaces can be used or is used to form a waste stack. The printing substrate 02 intended and/or suitable for the production of securities already comprises security features such as e.g. B. security threads, film applications, security fibers and / or watermarks.

In the manufacturing process of securities products or intermediate products, for example, printing substrate 02, e.g. B. present as a sheet of printing material 02, printed several times in several process steps using different printing processes and possibly provided with foil elements or other applications. In this case, for example, the still unprinted printing substrate 02 is initially printed in a first or first-time printing process in one or more steps according to the invention using an indirect planographic printing process or in an indirect letterpress process with e.g. B. a one- or preferably multi-colored motif providing an image background, which, for example, a large part, d. H. with more than 50%, in particular with more than 70% area coverage, of the printing area of the respective benefit. This first printing after the indirect planographic process and / or indirect letterpress process can be done at once at a pressure point 11 or by successively several pressure points 11; 12 on the same side of the substrate. Printing preferably takes place at at least one printing point 11; 12 in a multicolored collective print, i. H. with a simultaneous application of several color separations at the same printing point 11; 12. The process of initial printing can be done on one or preferably on both sides.

In the production of securities, the printing material 02, after it has been printed at one or more printing points 11; 12 after one or more times in a first printing process an indirect planographic or letterpress process or both of these processes, for example the background was printed in at least one subsequent printing process downstream in the same printing press or in at least one other printing machine on at least one side of the substrate in a printing process that differs from the indirect planographic process and the indirect letterpress process . In particular, it is printed in at least one subsequent printing process downstream in the same printing press or in at least one additional printing press in a direct letterpress process by at least one numbering printing unit with alphanumeric characters and/or it is printed in a subsequent printing process downstream in the same printing press or in at least one additional printing press in a Intaglio printing method printed with an image motif and/or it is printed in a subsequent printing process downstream in the same printing machine or in at least one other printing machine in a screen printing method with image elements which, for example, take up less than half the area coverage on the respective copy

The still unprinted printing material 02 is intended here, in addition to completely untreated printing raw materials, such as e.g. B. untreated web or sheet-like foil, fiber or paper materials or hybrid products thereof, also be understood to include printing substrate 02, the surface of which has already been covered over the entire surface and/or evenly in a preceding process step, for example with a printing substrate 02 for e.g. B. the printing pre-treating or conditioning fluid, such as a line or primer, was applied. In contrast to the full-area and/or uniform coating, e.g. B. the formation of a printed image, i.e. image information formed by varying color intensity and/or colors, through a deliberately uneven and/or structured application of material that is not uniform over the printing surface of the copy, in particular a single-color or multi-color application of color, for the viewer or a Sensor recognizable image information z. B. any regular or irregular Patterns or color gradients, image motifs, alphanumeric characters or combinations thereof.

In the printing substrate path of the printing press, which preferably effects the initial printing of the still unprinted printing substrate 02, in the case of a plurality of printing units 06; 07; 08; 09 these individually or together in several separate units 03.1; 03.2; 03.1*; 03.2* on the transport path or all arranged in a common unit. It can basically two in one as a double pressure point 11; 12 effective pressure point 11; 12 cooperating printing units 06; 07; 08; 09, two one-sided printing points 11; 12 printing units 06; 07; 08; 09, a printing unit 08 arranged on one side to form a printing position 12*, in particular a single printing position 12* and—upstream or preferably downstream—two printing units 06 forming a double printing unit 06, 07 or a double printing point 11; 07, or four in pairs a double printing unit 06, 07; 08, 09 or a double pressure point 11; 12 forming printing units 06; 07, 08; 09 be provided. At least two pressure points 11; 12 provided one behind the other in the transport path, of which at least one, preferably at least the downstream pressure point 11, is designed as a double pressure point 11 or even both pressure points 11; 12 as double pressure points 11; 12 are executed. The only or at least the first pressure point acting on at least one side of the printing material 12; 12*; 11 forming printing unit 09; 09*; 08 is designed to work according to an indirect planographic process or indirect letterpress process.

A printing group 03 with only one printing position 11 or a printing group 03*; 03**; 03*** with two or more bruises 11; 12 may be provided downstream one behind the other. In the printing machine shown as an example according to 1 can take the place the pressure group 03 shown there is also another of the advantageous embodiments presented below for the design of the pressure group 03; 03*; 03**; 03*** kick. In the printing material path, the printing press can be located between said printing group 03; 03*; 03**; 03*** and the product display 04 basically also one or more further processing stages, e.g. B. an application device and/or a painting device and/or another, according to a printing method compared to the first printing group 03; 03*; 03**; 03*** printing group working with different printing processes.

In a first embodiment for the printing press and/or the printing group 03, downstream of the feed device 01, as a first—and here only—printing point 11 in the printing substrate path, e.g. B. a double pressure point 11 is provided (see e.g. Figures 1 to 3 ).

In other versions (see e.g. 4 and 5 as 6 and 7 ) in the printing material path upstream of a printing point 11 designed, for example, as a double printing point 11, there is a printing point 12; 12* provided in the printing substrate path, which here for at least one side of the printing substrate is the first printing point 12; 12* and e.g. B. also as a double imprint 12 (see e.g. 4 and 5 ) or as a single print position 12* (see e.g. 6 and 7 ) is executed.

In a second and third embodiment of a printing press that is shown here as an alternative to the first embodiment, the printing units 06; 07; 08; 09 of two downstream pressure points 11; 12; 12* in a pressure point group 03*; 03**, in particular as a printing tower 03*; 03**, training pressure group 03*; 03**, e.g. B., for example in two stacked aggregates 03.1*; 03.2*; 03.1**; 03.2**, e.g. B. Printing units 03.1*; 03.2*; 03.1**; 03.2**, planned.

The transport path through the at least one printing point 11; 12; 12* and/or between two pressure points 11; 12; 12* follows in the exemplary embodiments Figures 1 to 7 vertically, especially from top to bottom.

In a z. Am Figures 8 to 10 exemplified second embodiment of a printing press, the transport path runs through at least one and / or between two printing points 11; 12 horizontally. For your as a double imprint 11; 12 trained pressure point 11; 12 are the pressure point 11; 12 forming printing units 06; 07; 08; 09 then arranged on top of each other. For the construction of the printing units 06; 07; 08; 09 can - using the arrangement tilted by 45 ° and the possibly deviating number of forme cylinders 21; 22; 23; 24 - the corresponding to the examples with vertical substrate path are transferred.

In the case of a "vertical" transport path, a printing material path should be understood which, in the route section considered - e.g. B. between the entry and exit of a printing unit or a pressure group or between two pressure points - overcomes a greater distance in the vertical direction than in the horizontal direction. The reverse applies to the "horizontal" transport path.

The printing units 06; 07; 08; 09 spaced pressure points 11; 12 can in principle be based on different printing processes. At least that or at the single or first pressure point 12 in the transport path; 11 involved printing unit 06; 07; 08; 09; 09* or printing units 06; 07; 08; 09; 09* and/or - in the case of several pressure points 11; 12 - the printing unit or printing units 06 involved in the transport path at the second or downstream printing point 11; 07 is or are preferably based on an indirect printing process. At least the at least one printing unit 08; 09 of an upstream or first printing point 12 or each of the two printing units 08; 09, likewise as on an indirect Running based on printing process.

In the embodiment as a printing press that processes sheet-shaped printing material 02, the printing material sheets 02 become the single or first printing point 12; 11 towards preferably by a transport system with successive sheet transfer between the rotating transport means 33; 38; 39, e.g. B. transport cylinders 33; 38; 39 and/or transport drums 33; 38; 39 causes. From the last transport means 33 in the transport direction; 38; 39, the printing material sheet 02 is applied to a cylinder 17; 19; 19* of a printing unit 17; 19; 19*, e.g. B. as a transport cylinder 17; 19; 19* effective printing unit cylinder 17; 19; 19*, handed over. From the feed device 01 to the printing cylinder 17; 19; 19* of the first printing position 11 in the transport path; 12 leading conveyor line 36 can, for. B. upstream of the at least one rotating transport means 33; 38; 39 comprise a transport means 46 embodied, for example, as a belt conveyor 46 or belt table 46 .

In the case of multiple pressure points 11; 12, the printing substrate sheets 02 are also preferably transported between them via a conveyor line 37 based on successive sheet transfer between rotating transport means. On the output side of the last printing point 11 to a subsequent unit and/or to the product delivery 04, this can also be done via a system based on sheet transfer between cylinders and/or drums, by a transport system 13 with circulating traction means, e.g. B. a chain gripper system 13 such. Am 1 or by a transport system 13* comprising, for example, one or more belt conveyors or belt tables, as exemplified in 8 .

Preferably, at least one drying device 14, in particular a radiation dryer 14, such as e.g. B. IR or UV dryer provided. This acts in particular on at least the largest print width upstream, ie the maximum extension of the upstream printed area transverse to the transport direction.

A printing unit 06 designed for indirect printing; 07; 08; 09 comprises a transfer cylinder 16; 17; 18; 19 formed cylinder 16; 17; 18; 19, e.g. B. Printing cylinder 16; 17; 18; 19, which acts as a counter-pressure cylinder with a cylinder 16; 17; 18; 19; 19*; e.g. B. Printing cylinder 16; 17; 18; 19; 19*, a pressure point 11; 12 trains. In the case of a double pressure point 11; 12 is used as an impression cylinder 16; 17; 18; 19 effective printing cylinder 16; 17; 18; 19 also by an ink-carrying printing unit cylinder 16; 17; 18; 19, in particular the transfer cylinder 16; 17; 18; 19 of the first-mentioned printing unit 06; 07; 08; 09 a double printing unit 06; 07, 08; 09 training printing unit 06; 07; 08; 09 formed. The transfer cylinder 16; 17; 18, 19 acts - in relation to the paint flow upstream - with at least one imaging cylinder 21; 22; 23; 24, e.g. B. Printing cylinder 21; 22; 23; 24, e.g. B. at least one forme cylinder 21; 22; 23; 24 together, which upstream by a suitable inking device 26; 27; 28; 29, e.g. B. an inking unit 26; 27; 28; 29, is colored or can be colored with printing ink.

The forme cylinder 21; 22; 23; 24 and the associated inking unit 26; 27; 28; 29 can in principle be based on any printing process, but as already explained above - for at least the first or only printing unit 06; 07; 08; 09 of one side of the substrate than on an indirect flat printing process, e.g. B. working as an offset printing unit according to an offset printing process, and / or based on an indirect letterpress or relief printing process, such as a letterset printing process, z. B. as a high-pressure unit after a high-pressure process working. For this purpose, the forme cylinder 21; 22; 23; 24 on its circumference in the former embodiment, a flat printing form, not shown here, e.g. B. an offset printing form for wet or dry offset, which is suitable for planographic printing with an inking unit 26; 27; 28; 29, in the case of wet offset z. B. a roller inking unit 26; 27; 28; 29 with an upstream ink fountain and with a dampening system, and for dry offset z. B. with a, for example, an anilox or cell roller and a squeegee device comprising short inking unit 26; 27; 28; 29 interacts. For the execution of high or relief printing, the forme cylinder 21 carries; 22; 23; 24 on its circumference a letterpress form, not shown here, which is equipped with an inking unit 26 suitable for letterpress; 27; 28; 29, e.g. B. a roller inking unit 26; 27; 28; 29 cooperates with upstream ink fountain. The letterpress form used in particular for printing with a background motif or a background color gradient is, in contrast to the usual flexographic or direct letterpress printing process, e.g. B. with an overhang of the printing raised surface to the non-printing lower surface of z. B. at most 1 mm, in particular at most 0.5 mm formed. Such "waterless" and in the indirect process operated or operable printing units with such letterpress forms are often also referred to as - especially waterless - "offset printing units" due to the indirect printing process and the low relief depth.

In a particularly preferred embodiment, at least one of the printing units 06; 07; 08; 09, e.g. B. the only one in the transport path or the first and/or the second, as collective printing unit 06; 07; 08; 09, ie for simultaneous, in particular multicolored printing of two partial print images. As collective printing unit 06; 07; 08; 09 trained printing unit 06; 07; 08; 09 includes as a transfer cylinder 16; 17; 18; 19 as an ink collecting cylinder 16; 17; 18; 19 effective ink-carrying printing unit cylinder 16; 17; 18; 19, which in relation to the ink flow is upstream with at least two imaging printing unit cylinders 21; 22; 23; 24, e.g. B. at least two forme cylinders 21; 22; 23; 24 interacts, which through respective inking devices 26; 27; 28; 29, e.g. B. inking units 26; 27; 28; 29 can be colored. The forme cylinder 21; 22; 23; 24 and associated inking units 26; 27; 28; 29 of a collective printing unit 06; 07; 08; 09 all in the above sense as after working with flat printing, e.g. B. as wet offset printing units, or working after letterpress, z. B. as letterpress works, or partly as working according to planographic printing and another part than working according to letterpress. In the case of an opposite printing unit 07; 06; 09; 08 can also be used in the manner mentioned as a collective printing unit 07; 06; 09; 08 be formed and in the manner set out above as an ink collecting cylinder 17; 16; 19; 18 effective transfer cylinder 17; 16; 19; 18 have.

In the case of a printing press processing sheet-shaped printing material 02, one of the two is printing point 11; 12 forming printing cylinder 16; 17; 18; 19; 19* as transport cylinder 16; 17; 18; 19; 19* executed and effective as such and preferably comprises on the perimeter one or more, in 2 , 4 and 6 merely indicated holding devices 31; 32, in particular so-called gripper strips 31; 32

As already indicated above, the printing material 02, which is in particular still unprinted, is transported from the feed system 01 to the first printing position 12 in the printing material path of the printing press; 11, in particular as a transport cylinder 17; 19; 19* effective printing unit cylinder 17; 19; 19* via at least one rotating transport means 33; 38; 39, e.g. B. a transport cylinder 33; 38; 39 or a so-called transport drum 33; 38; 39, which preferably has at least one, in 3 , figure 5 and 7 merely indicated holding device 34, in particular a so-called. Gripper bar 34 includes. The transport on the last transport path section of the conveyor section 36 before the first printing point 12 in the transport path; 11 is thus preferably based on a transport system with successive sheet transfer between cylinders 19 involved in the transport; 19*; 17 and/or means of transport 33; 38; 39

On the transport path of the conveyor section 36 from the feed device 01 to the first printing point 12; 11 is now at least one inspection device 41; 42 for inspecting the still unprinted printing material 02. There is At least one inspection device 41 embodied as a transmission inspection device 41 (also referred to as transmitted light inspection) and an inspection device 42 embodied as a reflection inspection device 42 (also referred to as incident light inspection) are provided.

Transmission inspection device 41 preferably has at least one sensor 43, which is more preferably embodied as an optical sensor 43 and/or as a sensor 43 for electromagnetic radiation, in particular as a camera 43, particularly preferably as a line scan camera 43, which has a sensor running transversely to the transport direction of printing substrate 02 Inspection line 47 scans. Inspection line 47 extends in particular over at least 80% of the width of the printing material, preferably over at least the printing width, ie the maximum extension of the area to be printed in the transverse direction, of the printing point(s) 11 adjoining downstream; 12. Inspection device 41 is therefore preferably a device that inspects printing substrate 02 over at least 80% of the width, preferably over at least the printing width to be printed downstream. The scanning takes place, for example, in a scanning segment 54 with an opening angle a lying, for example, between 45° and 75°, in particular between 55° and 65°. In a development, the transmission inspection device 41 has two such sensors 43, which can be designed for a respective detection of different wavelength ranges, for example visible light on the one hand and in particular infrared radiation (IR) on the other hand. The transmission inspection device 41 also has at least one means of illumination 44, which is preferably designed to be adapted to the associated sensor 43, at least in terms of its wavelength, and vice versa. The at least one sensor 43 of the transmission inspection device 41 and the at least one lighting device 44 of the transmission inspection device 41 are preferably arranged on different sides of that area of the transport path provided for the transport of printing material 02 on which the at least one sensor 43 and/or the at least one lighting device 44 this Transmission inspection device 41 is arranged aligned.

In a preferred embodiment (see e.g. Figures 1 to 12 ) is, for example, the at least one sensor 43 or, preferably, the at least one means of illumination 44 of the transmission inspection device 41 within a rotating transport means 33; 38; 39 of the conveyor line 36 is arranged and the corresponding other component consisting of the sensor 43 and the lighting means 44, e.g. B. the sensor 43, outside of this rotating transport means 33; 38; 39 and directed towards its surface. In other words, in a preferred embodiment, the sensor 43 and the lighting means 44 are arranged on different sides of the transport means wall. This according to the invention as a transport cylinder 33; 38; 39 executed rotating transport means 33; 38; 39 then has a lateral surface or wall which is at least partially transparent in at least the wavelength range relevant for the inspection, in particular transparent on at least one circumferential length corresponding to the printing length. The rotating transport cylinder 33; 38; At least one pressing element can be assigned to 39, in particular to hold the printing material 02 flat on the lateral surface of the transport cylinder 33; 38; 39 to arrange.

In a suitable embodiment of the arrangement, the transmission inspection device 41 is provided to interact with the first transport means 33 downstream of the sheet feeder or its feeder drum 38 (e.g. as an example in Figure 2, Figure 3 , Figure 6, Figure 7 ). In another suitable embodiment, the transmission inspection device 41 z. B. is provided to interact with a transport means 39 located further downstream in the transport path (e.g. as an example in Figure 4, Figure 5 , 9 and 10 ).

The lighting means 44 and the sensor 43 designed as a line camera 43 are preferably arranged in such a way that the lighting means 44 covers the at least partially transparent transport cylinder 33; 38; 39 - especially from the inside - on an axial inspection line 47 running on the cylinder surface, which intersects the radially running connecting line between the center of the camera lens and the cylinder axis. The lighting means 44 preferably lies on this connecting line. Thus, the inspection line 47 to be detected on the outside of the printing material is illuminated along a line from the central axis of the transport cylinder 33 by irradiation with the lighting means 44 embodied, for example, as infrared lighting means. 38; 39 to the center of the camera lens through the cylinder jacket, which is transparent at least in the relevant wavelength range, and through the substrate. The lighting means 44 is preferably designed with lighting means designed as LEDs, in particular with lighting means designed as IR LEDs.

The transport cylinder 33; 38; In a preferred embodiment, 39 advantageously consists of a transparent plastic, in particular thermoplastic, preferably of polymethyl methacrylate (PMMA) or acrylic glass. The cylinder jacket body is, for example, in two parts, z. B. formed by two drum caps and / or coated with an additional scratch-resistant coating and / or made of an IR-permeable and / or UV-resistant material, in particular the above. plastic, formed.

In a second embodiment (see e.g. exemplarily 14 and 15 ), which also applies to all exemplary embodiments for the printing machine and/or printing group 03; 03*; 03**; 03*** can be used, the at least one transmission inspection system 41 is located within infeed system 01 or, in particular, on the transport path of a transport means 46, e.g. B. a belt table 46 or belt conveyor 46 is provided. In this case, the sensor 43 and the lighting means 44 are arranged in a transport path section on both sides of the transport path. B. by a transport path section of the transport path to be traversed by printing substrate 02 during operation (see e.g. 14 ) and in another Design variant by a transport bypass 48 running parallel to the transport path to be passed through during operation (see e.g. 15 ). The latter can e.g. B. via an actuating means 49, z. B. a sheet switch or a transfer roller, selected and / or activated, for example, to inspect one or more sample sheets.

The lighting means 44 of the transmission inspection device 41 preferably emits at least predominantly light in an IR wavelength range, i. H. with a radiation maximum above 780 nm. It preferably emits the electromagnetic radiation in a narrow band, i. H. with a spectral half-width of at most 150 nm, preferably at most 100 nm, based on the radiant power. The radiation maximum is preferably at a wavelength of 850 ± 75 nm, in particular 850 ± 50 nm. Accordingly, the sensor is preferably designed as a camera 43, in particular a line camera 43 43 as an IR-sensitive camera 43, in particular line camera 43, formed.

The reflection inspection device 42 provided instead or preferably in addition to the transmission inspection device 41 preferably has at least one sensor 51, which is more preferably embodied as an optical sensor 51 and/or as a sensor 51 for electromagnetic radiation, in particular as a camera 51, particularly preferably as a line scan camera 51, which scans an inspection line 53 running transversely to the transport direction of printing substrate 02. The inspection line 53 extends in particular over at least 80% of the width of the printing material, preferably over at least the printing width, ie the maximum extension of the area to be printed in the transverse direction, of the downstream printing point(s) 11; 12. The inspection device 42 is therefore preferably a device that inspects the printing substrate 02 over at least 80% of the width, preferably over at least the printing width to be printed downstream. In a further development, the reflection inspection device 42 has two such sensors 51 for a respective Detection of different wavelength ranges can be formed, for example visible light on the one hand and in particular ultraviolet radiation (UV) on the other. The reflection inspection device 42 has at least one means of illumination 52, which is preferably designed to be adapted to the associated sensor 51, at least with regard to its wavelength. The at least one sensor 51 of the reflection inspection device 42 and the at least one lighting means 52 of the reflection inspection device 42 are arranged on the same side of the printing substrate 02 on the transport path. In this case, the means of illumination 52 is directed onto an inspection line 53 which is scanned by the sensor 51 , which is preferably embodied as a line camera 51 .

In a first embodiment (see e.g. Figures 1 to 11 and 13 ) For example, the at least one means of illumination 52 of the reflection inspection device 42 on the lateral surface of a rotating means of transport 33; 38; 39 arranged directed in the transport path and the sensor 51 on the same point of this rotating transport means 33; 38; 39 aligned. The rotating transport cylinder 33; 38; At least one pressing element can be assigned to 39, in particular to hold the printing material 02 flat on the lateral surface of the relevant transport cylinder 33; 38; 39 to arrange.

In this first embodiment, the lighting means 52 and the sensor 51 designed as a line camera 51 are preferably arranged in such a way that the camera lens is on the central axis of the transport cylinder 33; 38; 39 is directed and/or the lighting means 52 the transport cylinder 33; 38; 39 is irradiated from the outside to form the inspection line 53 from an angle which is at most 30°, preferably at most 20°, from the radial direction of the transport cylinder 33; 38; 39 differs. However, the lighting means 44 is outside the direct line of sight between the camera 52 and the inspection line 53.

In an embodiment according to the invention with both one on a transport cylinder 33, 38; 39 provided transmission inspection device 41 and one on a transport cylinder 33; 38; 39 provided reflection inspection device 42 are both inspection devices 41; 42 on the same transport cylinder 33; 38; 39 provided. Here, the respective lighting means 44; 52 and sensors 43; 51, however, is preferably arranged in such a way that the inspection lines 47; 53 do not coincide on the cylinder circumference, but are spaced apart from one another in the circumferential direction by at least 30 mm, preferably by at least 50 mm.

In another, not explicitly shown version, especially for machines with "horizontal transport path" such. B. explained below, the transmission inspection device 41 and the reflection inspection device 42 can also be used with different transport cylinders 33; 38; 39 be provided cooperatively.

A second reflection inspection device 42 can also be provided for all versions, which is equipped with a transport cylinder 33; 38; 39 interacts, the transport cylinder 33; 38; 39 is different and supports the printing material sheet 02 on the other side of the printing material.

In the remarks after Figures 1 to 7 acts the transmission inspection device 41 and / or the reflection inspection device 42 z. B. with a transport cylinder 33; 39 together, which in the transport path penultimate transport cylinder 33; 39 in front of the transport cylinder 17; 19; 19* effective printing unit cylinder 17; 19; 19* represents.

In an advantageous embodiment, the transport cylinder interacts with the transmission inspection device 41 and/or the reflection inspection device 42 33; 38; 39 is double-sized, ie with a circumference for receiving two sheets of printing material 02 and/or with two holding devices, in particular gripper strips, in particular diametrically opposite one another in the circumferential direction. There is a smaller curvature in the measurement area compared to a single large cylinder and/or there is more installation space for the interior lighting means 44 .

In the execution of 4 and 5 can this transport cylinder 33; 38; 39 can also be double-sized, or the transmission inspection device 41 and/or the reflection inspection device 42 can also be located on the second transport means 38 in the transport path for this exemplary embodiment, ie the transport means 38 following the design as a contact drum 38, e.g. B. double-sized transport cylinder 33 can be provided (see 4 respectively. figure 5 ).

In a second, in 14 and 15 but not explicitly illustrated embodiment, which also applies to all exemplary embodiments for the printing press and/or printing groups 03; 03*; 03**; 03*** can be used, the at least one reflection inspection system 42 is still inside the infeed system 01 or, in particular, on the transport path of a transport means 46, e.g. B. a belt table 46 or belt conveyor 46 is provided. In this case, the sensor 51 and the lighting means 52 are arranged in a transport path section on both sides of the transport path. g. by a transport path section of the transport path to be traversed by printing substrate 02 in operational terms, and in another embodiment variant by a transport bypass 48 running parallel to the transport path to be traversed in operational terms. B. via an actuating means 49, z. B. a sheet switch or a transfer roller, selected and / or activated, for example, to inspect one or more sample sheets.

The lighting means 52 of the reflection inspection device 42 preferably emits at least predominantly light in a UV wavelength range, i. H. with a radiation maximum below 380 nm. It preferably emits the electromagnetic radiation in a narrow band, i. H. with a spectral half-value width based on the radiation power of at most 150 nm, preferably at most 100 nm. The radiation maximum is preferably at a wavelength of 365 ± 75 nm, in particular 365 ± 50 nm. Accordingly, the sensor is preferably designed as a camera 51, in particular a line camera 51 51 as a UV-sensitive camera 51, in particular line camera 51, formed. The lighting means 52 is preferably designed with lighting means designed as LEDs, in particular with lighting means designed as UV LEDs.

In a preferred embodiment, the reflection inspection device 42 is protected against a direct view into the UV light source of the lighting means 52 and/or against the incidence of UV scattered light on the area of the inspection line 53 and has appropriate protection.

Basically independent of the design of the lighting means 44; 52 provided illuminant, but preferably at least in the case of an embodiment with one or more IR or UV illuminants designed as lamps, is the illuminant 44; 52 assigned a cooling. Preferably, this line is designed as a cooling fluid-carrying line, which z. B. via a first connection 56; 58 the cooling fluid to and via another port 57; 59 can be removed (see e.g. Figure 11, Figure 12 or 13 ).

In the embodiment with a transmission inspection device 41 and a reflection inspection device 42, the inspection system thus comprises two cameras 43 each; 51 comprehensive systems, each of which has an inspection line 47; 53 transparent at least partially and/or in a length wave window executed transport cylinder 33; 38; 39 or transport means 46 scans transversely to the transport direction, with each inspection line 47; 53 from its own means of illumination 44; 52 (e.g. with UV radiation on the one hand and with IR radiation on the other hand). In the figures Figures 11 to 13 the facts are shown using the example of the transport cylinder 33, but on the other transport cylinder 38 and/or on the transport cylinder 33; 38; 38 of a different size (identified in the relevant figures by the reference numerals 38 and 39 in brackets).

In the illustrated and preferred embodiments, the sole or at least one of the pressure points 11; 12, e.g. B. at least the downstream printing point 11, two cooperating collective printing units 06; 07 each with at least two, e.g. B. two or four, forme cylinders 21; 22 and associated inking units 26; 27 (e.g. 2 , 4 , 6 and 8 ).

The printing cylinder 16; 17; 18; 19; 19* to form the single or downstream pressure point 11; 12 of a pressure point group 03; 03*; 03** with e.g. B. vertical product path are preferably three times the size here, ie for receiving three sheets of printing material 02 on the circumference, for forming a first of a plurality of printing points 11; 12 and/or to form a pressure point group 03*** with e.g. B. horizontal product path preferably double-sized, ie designed to accommodate two printing substrate sheets 02 on the circumference. In the event that the first or only printing point 11; 12 a conveyor section 36 with a plurality of rotating transport means 33; 38; 39, in particular transport drums 33; 38; 39, between the feed device 01 and the transport cylinder 19* of the first or only printing point 12 in the transport path, the transmission inspection device 41 and/or the reflection inspection device 42 can in principle be installed on the transport path of any one of the rotating transport means 33; 38; 39 may be provided. At least that is preferred However, transmission inspection device 41 is provided on a transport means 33, which carries the printing substrate sheets 02 from a preceding transport means 46, e.g. g. downstream of a belt conveyor 46 or belt table 46, or the first rotating transport means 38 that takes over directly from the feed system 01 and/or a printing unit cylinder 17 that receives the printing substrate sheets 02; 19; 19* of the first printing position 12 in the printing material path; 11 is arranged as the last upstream rotating means of transport. The or a reflection inspection device 42 is preferably on a transport means 33; 38; 39 is provided, on which the printing material sheet 02 is conveyed resting on the same printing material side on which it is also supported on the transport cylinder 17; 19; 19* effective printing unit cylinder 17; 19; 19* supported by the first or only pressure point 12; 11 is promoted.

As in the horizontal substrate path version in 9 and 10 shown in dashed lines as an example, the transmission inspection device 41 and the reflection inspection device 42 could in principle also be equipped with different transport cylinders 33; 38; 39 can be arranged to work together on the printing material path.

In the manufacture of a security product or intermediate product in an above-mentioned Printing press, in which a printing substrate 02 that is not yet printed is printed for the first time in a first printing process, is carried out by the at least one inspection system 41; 42 a preliminary inspection. This is used to check security features, which, for example, before the first of several printing processes, d. H. prior to the initial printing of the still unprinted printing substrate 02, are already contained in or on the printing substrate 02.

One or more of the following inspections are carried out: B. contained security thread, in particular by inspection over the entire sheet 02.

In this case, the transmitted light method, in particular using IR radiation, using a z. B. above Transmission inspection device 41 can be checked for the presence/absence of a security thread and/or a check for continuity, i. H. consistency of the security threads in printing material 02 and/or checking for deviations in the thickness of the security thread and/or for lateral migration of the security thread beyond a defined limit and/or checking a microtext contained in or on the security thread.

In addition, in the reflected light process, in particular using UV radiation, using a z. B. above Reflection inspection device 42 carries out a check for the presence/absence of UV fluorescence in the security thread and/or a check for the presence/absence of a watermark over the entire sheet 02 and/or a check for the presence or absence of any security fibers contained and/or a UV fluorescence in the fibers throughout the arc 02.

The inspection facilities 41; 42 are on the output side - for example via a data processing device - with a signal connection to a machine controller, which, based on an inspection result representing the quality of the inspected printing material sheet 02, in the stack delivery 04 for a printing material sheet 02 previously identified as faulty, a delivery of this printing material sheet 02 above a stacking space defined as a waste pile of the stack delivery 04 is triggered or can be triggered. In addition, as a result of the inspection result for a sheet of printing material 02 previously identified as faulty, the machine controller can switch off one or more printing points 11; 12; 12* take place or can be effected. The sheets of printing material 02 recognized as free of errors are stored in a stacking area of the Stack delivery 04 for good sheets is placed or can be placed on a product stack.

Reference List

01

Feeder, sheet feeder

02

Printing material, printing material sheet, sheet, security sheet

03

pressure group

03*

Pressure group, pressure point group, pressure tower

03**

Pressure group, pressure point group, pressure tower

03***

Pressure group, pressure point group

03.1

Aggregate, pressure unit

03.2

Aggregate, pressure unit

03.1*

Aggregate, pressure unit

03.2*

Aggregate, pressure unit

03.1**

Aggregate, pressure unit

03.2**

Aggregate, pressure unit

03.1***

Aggregate, pressure unit

03.2***

Aggregate, pressure unit

04

Product display, stack display

05

-

06

Printing unit, collective printing unit

07

Printing unit, collective printing unit

08

Printing unit, collective printing unit

09

Printing unit, collective printing unit

10

-

11

Pressure point, double pressure point

12

Pressure point, double pressure point

12*

Pressure point, single pressure point

13

Transport system, chain gripper system

13*

transport system

14

Drying device, radiation dryer

15

-

16

Cylinders, printing unit cylinders, transport cylinders, transfer cylinders, impression cylinders, ink collection cylinders

17

Cylinders, printing unit cylinders, transport cylinders, transfer cylinders, impression cylinders, ink collection cylinders

18

Cylinders, printing unit cylinders, transport cylinders, transfer cylinders, impression cylinders, ink collection cylinders

19

Cylinders, printing unit cylinders, transport cylinders, transfer cylinders, impression cylinders, ink collection cylinders

19*

Cylinder, printing unit cylinder, transport cylinder, impression cylinder

20

-

21

Cylinder, printing unit cylinder, forme cylinder

22

Cylinder, printing unit cylinder, forme cylinder

23

Cylinder, printing unit cylinder, forme cylinder

24

Cylinder, printing unit cylinder, forme cylinder

25

-

26

Inking device, inking unit, roller inking unit, short inking unit

27

Inking device, inking unit, roller inking unit, short inking unit

28

Inking device, inking unit, roller inking unit, short inking unit

29

Inking device, inking unit, roller inking unit, short inking unit

30

-

31

Holding device, gripper strip

32

Holding device, gripper strip

33

Means of transport, transport cylinder, transport drum

34

Holding device, gripper strip

35

-

36

conveyor line

37

conveyor line

38

Means of transport, transport cylinder, transport drum, feed drum

39

Means of transport, transport cylinder, transport drum

40

-

41

Inspection facility, transmission inspection facility

42

Inspection facility, reflection inspection facility

43

Sensor, camera, line scan camera

44

means of lighting

45

-

46

Means of transport, belt conveyor, belt table

47

inspection line

48

transport bypass

49

actuating means

50

-

51

Sensor, camera, line scan camera

52

means of lighting

53

inspection line

54

scan segment

55

-

56

connection

57

connection

58

connection

59

connection

a

opening angle

Claims (15)

1. A printing press for producing security products or intermediate security products, comprising a feed device (01) for feeding unprinted printing substrate (02) into the printing press, multiple printing units (06; 07; 08; 09) by which the unprinted printing substrate (02) can be printed in an indirect planographic printing method and/or an indirect letterpress printing method in one or more printing points (11; 12), wherein in a conveyor line (36) between the feed device (01) and the first printing point (11; 12) in the printing substrate path a reflective inspection device (42) is provided for inspecting, with the use of UV radiation, the as yet unprinted printing substrate (02) for security features contained in or on the printing substrate, characterized in that in the conveyor line (36) between the feed device (01) and the first printing point (11; 12) in the printing substrate path an inspection device (41) embodied as a transmissive inspection device (41) is additionally provided, and in that the transmissive inspection device (41) comprises an IR-sensitive camera (43) and is provided on the transport path of a transport cylinder (33; 38; 39), the circumferential surface of which is at least partially transparent in at least the wavelength range that is relevant for the inspection.
2. The printing press according to claim 1, characterized in that the reflective inspection device (42) comprises an illumination means (52) and a camera (51) and/or in that the reflective inspection device (42) comprises an illumination means (52) that emits light with a radiation maximum lying in the UV wavelength range and/or with a spectral half-width of no more than 150 nm based on radiant power, and/or comprises a UV sensitive camera (51).
3. The printing press according to claim 2, characterized in that the reflective inspection device (42) is provided on the transport path of a transport cylinder (33; 38; 39).
4. The printing press according to claim 3, characterized in that the illumination means (52) and the camera (51) are arranged in such a way that the camera lens is directed toward the central axis of the transport cylinder (33; 38; 39) and/or in that to form the inspection line (53), the illumination means (52) irradiates the transport cylinder (33; 38; 39) from the outside at an angle that deviates no more than 30° from the radial direction of the transport cylinder (33; 38; 39) at the location of the inspection line (53).
5. The printing press according to claim 1, 2, 3 or 4, characterized in that an illumination means (52) or a camera (51) of the transmissive inspection device (41) is arranged inside the transport cylinder (33; 38; 39), and the other component, either illumination means (52) or camera (51), is arranged outside of the transport cylinder (33; 38; 39) and directed toward the surface thereof.
6. The printing press according to claim 1, 2, 3, 4 or 5, characterized in that the transmissive inspection device (41) and the reflective inspection device (42) are provided on the transport path of the same transport cylinder (33; 38; 39).
7. The printing press according to claim 2, 3, 4, 5 or 6, characterized in that an illumination means (44) of the transmissive inspection device (41) is arranged in the transport cylinder (33; 38; 39) in such a way that it irradiates the at least partially transparent transport cylinder (33; 38; 39) from the inside along an inspection line (47) that extends axially on the cylinder shell, which line intersects the connecting line that extends radially between the center of the camera lens and the cylinder axis, and/or in such a way that the illumination means (44) lies on the connecting line between the center of the camera lens and the cylinder axis.
8. The printing press according to claim 1, 2, 3, 4, 5, 6 or 7, characterized in that the transmissive inspection device (41) comprises an illumination means (44) that emits light with a maximum radiation lying in the IR wavelength range and/or with a spectral half-width of no more than 150 nm based on radiant power.
9. The printing press according to claim 1, 2, 3, 4, 5, 6, 7 or 8, characterized in that the transport path extends vertically through the at least one printing point (11; 12; 12*) and/or between two printing points (11; 12; 12*).
10. The printing press according to claim 1, 2, 3, 4, 5, 6, 7, 8 or 9, characterized in that in the printing substrate path at least one printing point (11; 12) is provided, which has a printing unit (06; 07; 08; 09) embodied as a collective printing unit (06; 07; 08; 09) on at least one side or on both sides of the printing substrate path, or in that in the printing substrate path downstream of the transmissive inspection device (41), two printing points (11; 12) configured as double printing points (11; 12) are provided, spaced apart in relation to one another, each of which is formed by two printing units (06; 07; 08; 09), configured as collective printing units (06; 07; 08; 09), provided on the two sides of the printing substrate path.
11. The printing press according to claim 1, 2, 3, 4, 5, 6, 7, 8, 9 or 10, characterized in that the inspection device (41; 42) is configured to inspect the as yet unprinted printing substrate (02) over at least 80% of its width running transversely to the direction of transport and/or over at least the printing width of the printing point (11; 12) that follows downstream.
12. A method for producing security products or intermediate security products, wherein an as yet unprinted printing substrate (02) is fed into the input side of a security printing press, the printing substrate (02) is printed on one or on both sides in an indirect planographic printing and/or letterpress printing method in a printing point lying in the printing substrate path (11; 12), and wherein before it reaches the printing point (11; 12), the as yet unprinted printing substrate (02) is inspected by a reflective inspection device (42) using UV radiation for security features contained in or on the printing substrate, characterized in that before it reaches the printing point (11; 12), the as yet unprinted printing substrate (02) is additionally inspected in a transmitted light method by at least one inspection device (41) embodied as a transmissive inspection device (41) for security features that are already contained in the as yet unprinted printing substrate (02).
13. The method according to claim 12, characterized in that downstream of the transmissive inspection device (41), the printing substrate (02) is printed in at least one printing point (11; 12) on both sides simultaneously and/or with the print images from multiple form cylinders (21; 22; 23; 24) simultaneously according to a collective printing method.
14. The method according to claim 12 or 13, characterized in that in the transmitted light method a security thread embedded in the printing substrate (02) is inspected, specifically a check for the presence/absence of a security thread is carried out and/or a check for continuity, i.e. absence of interruption, of the security threads in the printing substrate (02) and/or a check for variations in the thickness of the security thread and/or for a lateral migration of the security thread beyond a specified limit and/or a check of a microtext contained in or on the security thread is carried out, and/or in that in the incident light method, a check for the presence/absence of UV fluorescence in the security thread and/or a check for the presence/absence of a watermark and/or a check for the presence or absence of embedded security fibers and/or a UV fluorescence in the fibers is carried out.
15. The method according to claim 14, characterized in that the check by the transmitted light method and the check by the incident light method are carried out during the transport of the printing substrate (02) over the same transport cylinder (33; 38; 39) of a conveyor line (36) located upstream of the first printing point (11; 12) in the printing substrate path.

Images