DE102008001712A1 - Sheet fed printing press, has lacquer units arranged upstream, downstream, or between print units, and laser marking devices impacting on print sheets guided by conveying system in such manner that tactile samples are created on sheets - Google Patents

Abstract

The press has print units arranged one behind the other, and lacquer units arranged upstream, downstream, or between the print units. Print layers expandable by radiation are applied on print sheets (33) before a printing process or in the print units and/or the lacquer units. Laser marking devices (14) are arranged, and impact on the print sheets guided by a conveying system in such a manner that tactile samples are created on the print sheets. The print sheets are stored in a sheet delivery unit on a delivery stack.

Description

The The invention relates to a marking device for a Printing machine, in particular a laser marking device, for individual marking of printed sheets or individual Benefits on the signatures according to the preamble of claim 1.

facilities for marking printed sheets or individual printing benefits Within sheetfed presses have long been known.

In the EP 0737 572 B1 It is proposed, for individual printing of the individual sheets, for example with a barcode, laser or inkjet printer assign a sheet guiding drum, which is arranged in front of the first printing unit, between two printing units or after the last printing unit. The sheet is fixed with elaborate holding means, for example by suction, which detect the sheet end on the drum. This solution found requires a high technical effort and retrofitting existing machine configurations is very difficult.

In the DE 197 04 003 A1 It is proposed to arrange laser printing devices after the printing nip of a printing unit, wherein the sheet is provided with individual identifications as directly as possible after the passage of the printing nip, which is formed by the rubber and impression cylinder, by the sheet mounted on laser printing devices, the distance to the impression cylinder are to be passed. The disadvantage of this solution found that the freshly printed sheet must be fixed at rigid materials on the impression cylinder to prevent lifting of the sheet end and striking the laser printing device. Such sheet guiding devices are expensive and can not always avoid smearing. In addition, they can not completely fix the sheet end in a rigidly arranged sheet guide solution on the impression cylinder, as a collision between the grippers of the sheet leading impression cylinder, which protrude beyond the lateral surface of the impression cylinder, must be avoided. However, a slight lifting leads to a shift of the focal plane, which can cause a broadening of the laser marking. For this purpose, bow guide rollers are proposed, which are provided with a color-repellent coating. However, these can also collide with the grippers and thus swing. Alternatively, they would have to be dug. Both solutions are not practical, since even a slight relative movement, even with a color-repellent surface of the sheet guide roller, can lead to smearing of the fresh color layer.

One another technical and economic counter-argument against those in the aforementioned patent and published patent applications is that the lasers are relatively close to the bow Cylinders must be arranged so that the control room the machine is not restricted. To the whole width Therefore, several laser printing units are necessary to make the sheet to be able to provide the entire sheet with individual codes. This requires a higher control and setup time, depending on the distance between the laser and the printed sheet, the laser even works have to be moved to a dedicated work position. The attracted prior art suggests for the Positioning of the laser printing devices manual adjustment The position of laser printers before, a course of action in the age the highly automated setup processes on the market is no longer accepted.

In the DE 203 03 574 U1 It is described that, in connection with an image processing system, incorrectly recognized signatures or printing benefits are marked or inscribed by a printing device. Mention should also be made here of a laser printing device, which may also be associated with the boom of a sheet-fed press.

task The invention is a fast and cost-optimal Laserbeschrif processing device for To create signatures without additional setup effort gets by for the laser unit or the laser units.

Solved This object is achieved in a device with the features according to claim 1.

meaningful Further developments of the invention will become apparent from the dependent claims.

According to the invention proposed one or more laser devices in the field of Sheet conveying or above the installation space of a sheet delivery to arrange a sheet-fed press. Preferably is for the application of a sheetfed offset printing machine as a carrier device used.

Advantageously, the task setting is fulfilled by a coordinate-controlled, programmable system, in particular a scanner system in conjunction with a laser beam source. By a pulsed behavior of the beam source, it is preferably possible to generate individual points or lines in any desired arrangement on the sheet. The palpable structures are in this case achieved by an applied to the substrate flatulent paint or paint or other material that has been applied to the substrate before the printing process. This material puffs up exactly where it is with the of him According to the system according to the invention emitted beam, in particular laser radiation comes into contact.

The Invention will be described below with reference to drawings explained in more detail.

In this demonstrate

1 an arrangement in a sheet delivery,

2 Arrangements in a sheet-fed offset printing press and

3 the arrangement of a laser marking device.

In 1 is a sheet delivery 1 shown attached to a sheetfed press for forming a sheet stack of printed sheet 33 in a delivery 4 followed. In the workspace of the sheet delivery 1 (Space limit 3 ) is a laser marking device, not shown here 14 intended. This is located inside a funnel-shaped foreclosure 2 , which ensures that the laser beam can not endanger the health of the staff. In addition, a working distance for the deflection of the laser marking device 14 created, whereby the laser beam or the laser beams can be deflected over the entire sheet width to require as few individual laser units.

In 2 is a sheetfed offset press with a feeder 5 for sheet feeding, printing units 6 and 7 to print colors on the sheet 33 and a coating plant 8th between the printing units 6 . 7 for coating the printed sheets 33 and the boom 1 for stacking the printed sheets 33 shown. The printsheet 33 be in the sheetfed offset press on impression cylinders 20 , Sheet transport drums 21 and a chain conveyor system 22 Guided guided by grippers through all stations of the processing and finally stored on the delivery pile. This illustration shows a minimal configuration of a sheet-fed press. This can contain more than two printing units and more than one coating unit, which can also be arranged in different order.

In the area of the path of sheet conveying with gripper systems revolving on cylinders within the sheet-fed offset printing press thus illustrated, laser devices can now also be used 9 to 13 in various alternative arrangements directly bow leading cylinders (impression cylinder 20 ) or drums (sheet transport drum 21 ) or gripper carriage systems (chain conveyor 22 ). Here can advantageously the laser marking devices 9 to 13 For labeling well focused on the previously in printing units 6 . 7 and / or coating plants 8th coated printing sheet 33 be steered, since the cylinders and drums usually have solid surfaces or the bow guide serving counter surfaces, which provides a good positioning of the sheet 33 enable. In the bow boom 1 can the assignment by means of suction for the free-flying there on the chain conveyor 22 held sheet 33 respectively.

The arrangement of the laser marking devices 9 to 13 can be chosen so that several laser units are arranged across the width of the cylinder or drums. Then their distance to the respective required for the marking contact surface of the sheet 33 be chosen low, so that a small size can be achieved.

The arrangement of the laser marking devices 9 to 13 but can also be chosen so that only one or two laser units are arranged across the width of the cylinder or drums. Then their distance to the respective required for the marking contact surface of the sheet 33 be chosen so large that a safe sweeping the entire sheet width is achieved in the marking.

This is in 3 the Einstrahlprinzig a laser marking device on a counter-pressure cylinder 20 shown. The laser marking device consists of a laser unit 30 that optically with a scanner 31 connected is. As a scanner 31 acts an optical device for arbitrarily controllable, possibly periodic deflection of a laser beam 32 on an imaging area of a printed sheet 33 , This is also the focus of the laser beam 32 on the respective substrate (printed sheet 33 ) constantly adjusted according to the distance. From the laser unit 30 will laser light to the scanner 31 transferred from there as a controlled and possibly on the sheet 33 oscillating laser beam 32 radiated.

The scanner 31 is to a sufficiently large possibly adjustable distance above the sheet 33 carrying impression cylinder 20 arranged. This is the maximum required pendulum angle of the laser beam 32 in relation to the maximum possible width of the printed sheet 33 not too large so that the motion control is limited to acceptable speeds and the adjustment control can be optimized for focusing.

As a result of the movement of the laser beam 32 this can be as needed, the full width of the sheet 33 cover and write or edit on the surface as a result of his ge irradiated the desired pattern into the corresponding surface areas.

When arranging a plurality of laser marking units side by side at a station for marking or editing the surface of the sheet 33 arise corresponding conditions, with the distance of the scanner 31 to the print sheet 33 then can be chosen correspondingly lower.

The printsheet 33 are doing one or more laser marking 9 to 13 exposed for processing. The laser marking devices 9 . 11 and 12 are counter-pressure cylinders 20 assigned to those the printed sheets 33 be guided safely. The laser marking device 10 is a sheet transport drum 21 assigned and irradiated the sheet 33 from the inside, with the printed sheet 33 on one of the sheet transport drums 21 opposite sheet guide surface (sheet guide path), if necessary pneumatically guided. Finally, the laser marking device 13 another chain conveyor 22 to the sheet delivery 1 assigned. Each of the mentioned laser marking devices 9 to 13 can be from one or more laser units 31 exist and can be variably and adjustably arranged on the respective sheet guiding element. This is every point of the sheet 33 during its transport through the printing press by means of a laser beam 32 irradiated. In this case, the sheet movement and speed in the movement of the laser beam for processing 32 included.

In other application can on the bow boom 1 be provided in the upper Verschutzung one or more inlet openings through which the laser beam or the laser beams in the space of the sheet delivery 1 enter and on the out there by the delivery gripper systems led sheet 33 for the purpose of labeling or marking the printed sheet 33 can or can.

Preferably, the surface of the printing sheet is 33 for the purpose of inscription or marking only swept by one or two laser beams.

The installation of the laser marking device 14 above the installation space of a boom of a sheet-fed press accordingly 1 allows a deflection of the laser beam over the entire width or parts of the sheet 33 with only small adjustment movements of the deflection optics or deflection optics (scanner) of the laser. These small paths can be done much faster than the relatively large adjustment paths that would be required if the laser were placed within the space of the cantilever. The fast, small movements of the deflection optics allow writing and marking work on the entire sheet 33 with one or only a few laser units in the laser marking device 14 be performed. An arrangement closer to the sheet 33 would require higher adjustment paths and times, so that in a complex marking, the writing speed according to the current state of the art is not sufficient and therefore the number of laser units within the Laserermarkierunsgeinrichtung 14 would have to be increased. For marking or inscribing the print sheet 33 Only a relatively small time window can be used, which lies between the leading and the returning gripper system of the boom. In addition, a strong trailing or leading the laser beam relative to vertical incidence position would generate an angle of incidence, which leads to a deterioration in the quality of the writing image. The laser beam is widened and the line width thus wider. It is therefore also necessary for quality reasons to sweep the entire sheet width in a relatively small time window. The proposed solution according to the invention makes this possible in the best way.

The assignment of a laser marking arrangement 13 . 14 to the sheet delivery 1 a sheet-fed press has the further advantage that the sheet 33 in the straight part of the sheet guide tracks is guided flat and can be fixed by the pneumatic working sheet guiding devices on this by negative pressure. Elaborate setup work and additional sheet guiding elements are not required in the inventive solution.

Additional set-up times are not incurred since neither sheet guiding devices nor laser marking devices 9 to 14 equipped and cumbersome to be adjusted. The laser marking devices 9 to 14 are mounted in a fixed position and the desired marking location is controlled by the movement of the laser optics for deflecting the laser beams. In the event that is not to be marked, the laser beam (s) are switched off and switched on to the marking or the laser beam is deflected so that it does not touch the printed sheet 33 meets and gets on the sheet 33 steered when a mark is to be made.

The laser (s) could theoretically also be mounted on a travel carriage or a linear drive or a plurality of linear drives which drive the laser (s) over the machine width or, if appropriate, also in the X, Y direction over the printed sheet 33 method. However, these drives require special protection against dust and powder, as in the area of the sheet delivery 1 often occurs. In the 1 shown fixed position high above the space of the sheet delivery 1 but ensures a low tendency to fouling. The lack of moving parts that are exposed also increases the robustness of the overall system.

Another advantage of a position of the laser marking device 14 far above the installation space 3 of the sheet delivery 1 is that contamination of the laser optics by dust and powder in the sheet delivery 1 inevitably incurred in a sheet machine, can be reduced even further, in which there is a slight overpressure in the funnel, which closes the beam range of the laser, which flows the air from the hopper towards the interior of the boom. This largely avoids the penetration of dust and powder. The overpressure can be generated in a known manner by fans or fans, which blows air into the hopper building space. This advantage also applies to the corresponding arrangement of the laser marking devices 9 to 13 at the printing 7 or coating plants 8th ,

The arrangement over the boom 1 requires as well as in the printing 7 or coating plants 8th for safety reasons, a shielding of the beam area of the laser relative to the environment in order to avoid leakage and possible deflection of the laser beam and contact of a machine operator with the laser beam. Any contact with powerful laser units can cause serious physical damage, which must be avoided at all costs.

a Such shielding can be done by the beam area of the laser by a metallic or polycarbonate sheath or a different type shielded for laser absorption suitable protection device becomes. Here is the type of shielding on the type of laser and to match the wave length emitted by him appropriately.

The Ummantelung of the beam area must be designed so safety that a disassembly or opening leads to the immediate shutdown of the laser or the laser. An access or access or opening of a protection of the boom space (as well as the installation space at a pressure 7 or coating unit 8th as in 2 ) must also lead to a shutdown of the laser. In this case, the protective devices must be protected against opening, which were previously secured only by screws. This can be done by special screws or electrical contacts that interrogate the presence of the protection.

The laser beam (s) can interact with an IR-reactive or a UV-reactive material which has previously been applied to the substrate (printed sheet 33 ) was applied. Such a material may be an IR-reactive or a UV-reactive printing ink or a varnish, in which a volume change is brought about by the laser beam. The material may also be a printing ink or a varnish which has elements which are swellable under the action of heat and which leads to haptically sensible structures and / or color changes in the region which is swept by the laser beam.

This can be in the devices after 1 or 2 In particular, a Braille font embossment are generated. As a coordinate-controlled, programmable system, the laser beam is capable of any pattern on the printed sheets to be processed 33 to write. Here, a kind of scanner system is provided. By pulsing the laser beam, a dotted pattern can be generated. The puncture can then as well as a line pattern in any way on a sheet 33 be attached.

Such a structure may be placed in further leading pressure 7 or coating plants 8th be provided with a protective layer, such as a lacquer layer, so that it creates protected below this layer and thus more resistant.

Such a structure generated by the laser beams on the printing sheet 33 can also be used after generation in further downstream printing 7 or coating plants 8th with a protective layer, e.g. B. a lacquer layer are provided so that the structure is effectively protected.

Of the Laser can itself a CO2 laser, a diode laser, an excimer laser or a YAG laser. Also suitable are fiber or disk lasers. In principle, however, any type of laser is suitable, which allows with suitable controls to process an intumescent layer (irradiate) without destroying them.

The Treatment by irradiation can cause physical or chemical reactions in the appropriate layer.

The Processing takes place, for example, in IR-reactive systems by the action of heat, which leads to the swelling of the irradiated layer elements.

The On the other hand, processing takes place in UV-reactive systems Triggering a chemical reaction that is punctual Polymerization and thus the puffing of the irradiated Layer elements leads.

The proposed solution is suitable for the generation of sensible Structures in the production of printed products for the graphic industry. Braille in particular (braille on pharmaceutical packaging). By integration into the printing process, the generation the sensible structures in the process of printing done.

To the hitherto known state of the art are only embossing with matrix and patrix known, but as inflexible and only be considered profitable from a high print run have to. Furthermore, the coinage is in one the actual printing process downstream step generated.

Of the big advantage of the system is its high flexibility, because the structures are controlled by a coordinate-controlled, programmable System are generated. It is also an inline procedure what the downstream operation of the coinage and the necessary embossing plant can be omitted.

It is thus a coordinate-controlled, programmable system, in particular a scanner system in conjunction with a laser beam source, provided. By pulsed driving the radiation source can easily individual points or lines in any order on the sheet 33 be generated. The desired tactile structures are provided by means of inflatable paint applied to the substrate or a corresponding lacquer or other suitable material which is applied to the printed sheet prior to the printing process 33 may have been applied. The respective coating puffs up exactly where it comes from a laser marking device 9 to 14 emitted laser radiation is contacted.

The inventive system of laser marking devices 9 to 14 can be completely flexible depending on the space available before, in or after printing 7 or coating unit 8th a printing press or in conjunction with a boom 1 the printing machine, in particular a sheet-fed offset printing machine can be installed. There is the possibility of applying a protective film to the structure produced by the system by means of a subsequently applied paint or lacquer layer or to produce the structure in or below a previously applied coating of paint or lacquer.

1

boom a sheetfed press

2

funnel-shaped Shutting off the laser beam

3

space limitation of the jib

4

display (Stack area) of the boom

5

investor

6

printing unit

7

printing unit

8th

coating unit

9

Laser marking device

10

Laser marking device

11

Laser marking device

12

Laser marking device

13

Laser marking device

14

Laser marking device

20

Impression cylinder

21

Sheet guide drum

22

conveyor system

30

laser unit

31

scanner

32

laser beam

33

sheet

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

• EP 0737572 B1 [0003]
• - DE 19704003 A1 [0004]
• - DE 20303574 U1 [0006]

Claims (18)

Sheet-fed printing machine with one or more successively arranged printing units, with one or more the printing units before, intermediate or downstream coating units and with a delivery pile having sheet delivery, the sheets within the sheet-fed press in the course of the work process by means of conveyor systems on rotating gripper systems in the gripper closed by the printing units, coating units and the sheet delivery are promoted and stored in the sheet delivery on the delivery pile, characterized in that before a printing process or in one or more printing units ( 7 ) and / or coating plants ( 8th ) of the sheet-fed printing press by radiation expandable pressure layers on the sheet ( 33 ) and that one or more laser marking devices ( 9 to 14 ) arranged on or through the conveyor system (s) ( 20 . 21 . 22 ) supported sheet ( 33 ) acts in such a way that on the printed sheet ( 33 ) tactile patterns are generated. Sheet-fed printing machine according to claim 1, characterized in that the conveyor system of corresponding to the number of printing units arranged counter-pressure cylinders ( 20 ) and sheet transport drums ( 21 ) and that the laser marking devices ( 9 to 12 ) one or more impression cylinders ( 20 ) or sheet transport drums ( 21 ) are upstream, downstream or downstream. Sheet-fed printing machine according to claim 1, characterized in that the conveyor system with the sheet delivery ( 1 ), the printed sheets ( 33 ) carrying rotating gripper systems ( 22 ) by means of which the printed sheets ( 33 ) can be deposited in the gripper closure on a delivery pile, wherein the sheet delivery ( 1 ) an upwardly closed space ( 2 ), which covers the area of the conveyor system ( 22 ) and that the laser marking devices ( 13 . 14 ) in conjunction with the sheet delivery ( 1 ) are arranged. Sheet-fed printing machine according to claim 2 or 3, characterized in that the laser marking devices ( 9 to 14 ) of a conveyor ( 20 . 21 . 22 ) are assigned in such a way that they are used to convey the printed sheets ( 33 ) in a defined position relative to the respective laser marking device ( 9 to 14 ) is equipped. Sheet-fed printing machine according to claim 2 to 4, characterized in that the conveying device an impression cylinder ( 20 ) or a full-surface sheet transport drum ( 21 ) or a sheet guide track or a sheet tightening device. Sheet-fed printing machine according to claim 1 to 5, characterized characterized in that a sheet-fed printing machine according to the principle of Offset printing or flexo printing or gravure printing or screen printing is used. Sheet-fed printing machine according to claim 1 to 6, characterized in that each laser marking device ( 9 to 14 ) one or more laser units ( 30 ) as a CO2 laser and / or excimer laser and / or YAG laser and / or diode laser and / or a laser of other types, which is suitable for the selective irradiation of an intumescent layer. Sheet-fed printing machine according to claim 7, characterized in that each laser marking device ( 9 to 14 ) one or more scanners ( 31 ) by means of which one of the laser unit ( 30 ) generated laser beam ( 32 ) with respect to a sheet to be irradiated ( 33 ) including the sheet movement at any point of the surface of the sheet ( 33 ) is controllable and focusable. Sheet-fed printing machine according to claim 1 to 8, characterized in that the marking on the printing sheet ( 33 ) takes place by the local laser flattening of inflation elements contained in the ink or varnish layer takes place by the laser. Sheet-fed printing machine according to claim 9, characterized in that the marking on the printing sheet ( 33 ) is carried out by the laser by embossing the surface by local flatulence of inflation elements contained in the ink or varnish layer. Sheet-fed printing machine according to claim 8 to 10, characterized in that the flatulence by an action on physical Way done. Sheet-fed printing machine according to claim 11, characterized in that the flatulence caused by heat he follows. Sheet-fed printing machine according to claim 11 or 12, characterized in that the flatulence by irradiation of an IR-reactive Layer takes place by means of a laser with high IR light content. Sheet-fed printing machine according to claim 8 to 10, characterized in that the flatulence is due to an action on chemical Way done. Sheet-fed printing machine according to claim 14, characterized in that the bloating takes place by polymerization. Sheet-fed printing machine according to claim 14 or 15, characterized in that the flatulence takes place by irradiation of a UV-reactive layer by means of a laser with a high proportion of UV light. Sheet-fed printing machine according to claim 1 to 16, characterized in that the surface provided with markings sealed or coated. Sheet-fed printing machine according to claim 1 to 16, characterized in that the markings in a coating below a sealing or protective coating forming surface of the sheet ( 33 ) becomes.