EP2754541A2 - Method for adjusting the pressing force a punching machine - Google Patents

Abstract

The method involves providing tool data, which describes an individual structure of a cutting tool (30) including cutting and grooving tools, rubber linings, and round embossing stereotypes. Specific force data is read from a workflow connection (26). A specific pressing force is assigned to the cutting and grooving tools, the linings and stereotypes by the specific force data. A target-pressing force is calculated from the tool data and the specific force data. A pressing force (F) of a flatbed cutting and/or embossing machine (100) is adjusted to the target-pressing force. An independent claim is also included for a flatbed cutting and/or embossing machine.

Description

The invention relates to a method for adjusting the pressing force of a flatbed punching and / or embossing machine according to claim 1, as well as a flatbed punching and / or embossing machine according to claim 8.

State of the art

As punching the cutting is referred to with closed geometric blank forms that can be circular, oval or polygonal and imaginary shapes of all kinds. Also the practices practiced in print finishing, such as punching with punch, corner punching and register punching are counted to this area. The punching takes place against a punching pad or against stamp, in some cases it is also shearing operations. Plastic packaging materials, film material, paper, cardboard, cardboard or corrugated board are mainly punched in sheet format but also in web format. When punching but also creasing lines or blind embossing can be introduced into the benefit. Since the end products are sophisticated packaging in terms of technical and graphic design (such as packaging for cosmetics, cigarettes, pharmacy, food, etc.), special requirements are not only placed on the packaging materials themselves, but are also punching tools for optimum results required with the smallest tolerances and extremely precise and reliable punching machines. Flatbed punching best meets these demands. In this case, in the case of sheet processing, the printed sheets stacked on a pallet are fed to the punching machine. In the machine, the sheets to be punched are precisely aligned in an alignment device, taken over by a gripper carriage and positioned exactly in the punching device between a fixed undercounter and a vertical over a knee lever or eccentric upper table. Also known are machines in which the undercounter is moved against a fixed upper table.

In known sheet punching and embossing machines that are used for punching, embossing, breaking, if necessary. Nutzentrennen and storing sheets of paper, cardboard and the same, it is known to move the sheet by means of gripper carriage through the individual stations of the machine. A respective gripper carriage has a gripper bridge, are attached to the gripper, which grip the bow at a front end. A gripper carriage further has lateral carriages, which are connected to endless chains of the transport system and whereby the gripper carriage to be moved by the machine. By this type of movement of the sheet through the machine, a high machine performance is possible because the sheets in the individual successively arranged stations of the machine, in particular punching, breaking and blanking station (cutting - stripping - blanking), are processed one after the other.

Such a flat bed punch is for example from the DE 30 44 083 A1 and the US 7,658,378 B2 known. The two tables are equipped with cutting and scoring tools or corresponding counter tools, with which punched out of the cyclically guided between the table surface sheet benefits and at the same time pressed the necessary for clean folding grooves. In the subsequent breakout the waste is removed by machine tools. Depending on the equipment of the machine finally the punched benefits can be separated in a designated Nutzentrenneinrichtung.
In order to obtain products of high quality, the pressing force in the sheet punching and embossing machine must be able to be adjusted according to the sheet to be processed.
Like in the DE 30 44 083 C3 described, this is done by moving wedge-shaped steel plates. These steel plates are located between eccentric shafts and the driven upper table. By moving the wedge-shaped steel plates, the distance between the moving upper table and the fixed lower table is changed, and thus the punching force.
On the one hand to have a sufficient pressing force and on the other hand to reliably avoid that the punching tools acted upon with too much force and consequently destroyed, the machine operator has to the optimum pressing force grope. Together with the trimming by pasting the punching tool results in a very time-consuming adjustment process.

task

Object of the present invention is to describe a method for adjusting the pressing force and to provide a flat-bed punching and / or embossing machine, which greatly simplify the setting of the pressing force and the error rate and the required time for the establishment of flat-bed punching - and / or embossing machine and so reduce the disadvantages of the prior art.

This object is achieved by a method for adjusting the pressing force with the features of claim 1 and by a flat-bed punching and / or embossing machine with the features of claim 8.

The inventive method is used to set the pressing force of a flatbed punching and / or embossing machine, the machine has a punching and / or embossing tool for processing a flat substrate. In a first step, job-dependent tool data are provided which describe the individual structure of a stamping and / or stamping tool from a plurality of part tools. Subsequently, specific force data stored there are read out from a database, wherein the specific force data assign a specific pressing force to a respective sub-tool. From the tool data and from the specific force data is then a calculation of a desired pressing force. By appropriate control of an adjustment then the pressing force of the flatbed punching and / or embossing machine is set to the calculated target pressing force. An advantage of this method is that the machine operator does not have to move slowly step by step to a required punching force, which achieves a good punching image, but can already start the first punching process with a pressing force which is close to the optimum pressing force. This significantly speeds up the machine settings during a job change so that the quality requirements are produced faster and the number of spoofing sheets caused by the setup can be reduced.

In a further development of the method according to the invention, the effective pressing force can be corrected in an additional step after a first punching or pressing operation and the assessment or assessment of a stamped or embossed printing material by the machine operator. Correction steps may be suggested to the machine operator by the machine controller of the flat bed punching and / or embossing machine. It is particularly advantageous if the pressing force is stored for repeat jobs, so that the time required to set up repeat jobs can be significantly reduced.

In a particularly advantageous and therefore preferred development of the method according to the invention, the tool data comprise information on the type of a respective sub-tool and on the effective length and / or effective area of a respective sub-tool. In the part tools can be distinguished between cutting knives, Rillmessern, Messerergummierungen, embossing clichés, etc. Here, a more precise distinction is preferred, so between different cutting blades with different cutting geometry as well as different Rillmesser with different Rillmessergeometrie as well as between rubbers with different width and elasticity. With the embossing clichés, a distinction can be made between different cliché materials and embossing depths. Because of the nature of a particular part tool, the tool data also includes the effective length of the respective part tool, as far as it is cutting knife, Rillmesser and rubbers or the effective area, if it is to be embossing clichés. Advantageously, the specific force data in the database are given as the required pressing force per effective length or per effective area of a respective part tool. This means that different specific cutting forces, creasing forces, gumming forces and embossing forces are stored in the database. For the calculation of a desired pressing force can be calculated by adding the required part per part tool Sollpresskräfte calculated as products of the length of the sub-tool with the respective associated specific pressing force or effective area with the respective assigned specific force a required set pressing force for the whole tool can be calculated. In a particularly advantageous embodiment of the method according to the invention, the specific force data depends on the substrate to be processed, for. B. its thickness, its material composition and its format. The specific force data stored in the database must be determined in advance in extensive test series in a special single test bench. Therefore, the data is provided by the machine manufacturer. The more extensive the database is, ie the more different sub-tools are depicted for different substrates, the more accurate the required and permissible desired pressing force can be calculated according to the method according to the invention.

It is particularly advantageous if additionally a security, distribution, number and / or size factor is used in the calculation. Safety factor means z. B. a safety factor of size 0.8, which is multiplied by the calculated from tool data and specific force data pressing force. The operator is thus enabled to grasp this reduced, calculated pressing force to an actual required and permissible pressing force, minimizing the risk of destroying punching and / or stamping tools due to excessive pressing force adjustment. A distribution factor can take into account the distribution of benefits over the total area of the substrate, for example, whether the benefits are evenly distributed or not. The number factor can take into account the number of uses on a substrate. The size factor in turn can reflect the size of the printing material or of the punching and / or embossing tool.

If no distribution factor is used, alternatively a different desired pressing force for different tool areas can be calculated. According to the prior art, the adjusting device for punching force adjustment comprises four adjusting wedges, which can be adjusted independently of each other. Each wedge could be given an individual adjustment movement according to a desired pressing force calculated for this area (ie quadrants).

The invention also relates to a flat bed punching and / or embossing machine with a machine control for carrying out the method described above and with a workflow connection and / or an interface for transferring data from the pre-press of the processed print materials and / or from the Punching and / or embossing tool production which can either be used directly as tool data for the method according to the invention or even receive a processing by a computer and / or an interface for inputting tool data.

The described invention and the described advantageous developments of the invention are also in any combination with each other advantageous developments of the invention.
With regard to further advantages and constructive and functional advantageous embodiments of the invention, reference is made to the dependent claims and the description of exemplary embodiments with reference to the accompanying figures.

embodiment

The invention will be explained in more detail with reference to accompanying figures. Corresponding elements and components are provided in the figures with the same reference numerals. In favor of a better clarity of the figures was waived a true to scale representation.

Figur 1:

eine erfindungsgemäße Bogenstanz- und/oder -prägemaschine

Figur 2:

ein beispielhaft, grob schematisch dargestelltes Stanz- und/oder Prägewerkzeug

In a schematic representation:

FIG. 1:

an inventive sheet punching and / or embossing machine

FIG. 2:

an example, roughly schematically illustrated punching and / or embossing tool

In FIG. 1 the basic structure of a sheet punching and embossing machine 100 for punching, breaking, Nutzentrennen and storing sheets of paper, cardboard, plastic and the like is shown. The punching and embossing machine 100 has a feeder 1, a punching station 2, a breakout station 3 and a boom 4 with storage and Nutzentrennstation, which are supported and enclosed by a common machine housing 5 and driven by a main drive 17. From one side, the so-called operator side, the processing stations 2, 3, 4 are accessible; on the opposite side, the so-called drive side, is the drive train of the sheet punching and embossing machine 100. A machine control 15 controls the processes within the punching machine 100. The machine control 15 is connected to a database 25 in which specific force data are stored and settings for Repeat orders can be saved. Furthermore, the machine control 15 has an interface for data input, a standard interface and a workflow connection 26, so that tool data can be provided. The machine control 15 is at least even with a device for pressing force adjustment 24 in a data exchange connection and can control these.

The sheets 6 are separated by a feeder 1 from a stack 6.1 by a so-called suction head 18, fed to the sheet transport system 7 and gripped by gripper bars of a gripper carriage 8 grippers at its front edge and intermittently in the sheet transport direction B through the various stations 2, 3 and 4 the punching and embossing machine 100 pulled through.
The sheet transport system 7 has a plurality of gripper carriages 8, so that a plurality of sheets 6 can be processed simultaneously in the various stations 2, 3 and 4. The gripper carriage 8 can be driven by a chain drive.

The punching station 2 consists of a lower crucible, a so-called. Subtable 9, and an upper crucible, a so-called. Obertisch 10. The upper table 10 is vertically reciprocally mounted, provided with an upper tool 30 with punching and Rillmessern and is under a press force F against the undertable 9 employed. In the yoke of the upper table 10, a device for pressing force adjustment 24 is arranged. The lower table 9 is fixedly mounted in the machine frame 5 and provided with a counter-plate 20 to the punching and Rillmessern. Alternatively, the upper table 10 fixed and the lower table 9 may be moved. In embossing, as an alternative or in addition to the punching and scoring tools 31, 32, embossing tools are used, in particular in the form of so-called embossing plates 34. The gripper carriage 8 transports the sheet 6 from the punching and embossing station 2 in the subsequent breaking station 3, which is equipped with breakout tools 21, 23. In the stripping station 3, the unwanted pieces of waste 11 are pushed out of the sheet 6 down with the help of the stripping tools 21, 23, whereby the waste pieces 11 fall into an inserted under the station car-like container 12 or be transported away from there.

From the breaking station 3, the sheet 6 enters the boom 4, where the sheet 6 is either simply stored, or at the same time there is a separation of the individual benefits of each sheet 6. The boom 4 may also include a pallet 13, on which the individual sheets 6 or benefits in the form of a stack 14 are stacked, so that after reaching a certain stack height, the pallet 13 with the Sheet stack 14 can be moved away from the area of the punching and embossing machine 100. In order not to have to stop the machine 100 during the stack exchange, auxiliary stacking devices can be used.

In FIG. 2 a punching tool 30 is shown, which serves the processing of four benefits. For this purpose, the punching tool 30 has a plurality of different sub-tools, such as cutting blades 31, creasing knives 32, rubber linings 33 mounted parallel to the cutting blades 31 and in each case a round embossing cliché 34 in the middle. The tool data which describe this punching tool 30 comprise the type of the respective sub-tools 31, 32, 33, 34 and the effective lengths l _s , l _R , l _G and the effective area Ap. Thus, the length of the cutting blade l _{s is} composed of all partial lengths of the cutting blade 31. The effective length of the knives l _r is made up of all the partial lengths of the creasing knives 32. The length of the rubber coating l _G is composed of all part lengths of the topping 33rd The effective area of the embossing plates Ap is in turn composed of the sum of the partial surfaces of the embossing plates 34. In the Fig. 2 is - for better clarity - each only a partial length or partial area provided with a reference numeral.
If these tool data from the pre-press or the production of the punching tool 30 are known, then a direct use in the calculation of the desired pressing force otherwise, the tool data must be entered into the machine controller 15 via an interface.

For the calculation of the desired pressing force F, the machine control 15 accesses a database 25 in which specific force data are stored. There, therefore, the required cutting force per meter for a particular cutting blade 31 and the creasing force per meter for a special creasing tool 32 and the required Gummierungskraft per meter for a special rubber 33 and the required stamping force per m ² for a special embossing cliché 34 deposited , These specific values are multiplied by the corresponding length of the part tool (cutting length, crease length, length of gumming) or surface (embossing surface) and the required pressing force F is calculated by adding the values for the part tools 31, 32, 33, 34). In the machine control additional multiplication factors, such. B. security, distribution, number, and / or size factor be deposited in order to make an adjustment of the calculated pressing force before it is implemented by appropriate control of the adjuster 24 by the machine control 15.

LIST OF REFERENCE NUMBERS

1

investor

2

Punching and / or embossing station

3

stripping

4

Outrigger, if necessary with Nutzentrennstation

5

machine housing

6

bow

6.1

sheet pile

7

Sheet transport system

8th

Gripper carriage with grippers

9

Lower table / lower crucible

10

Upper table / upper crucible

11

trimmings

12

container

13

palette

14

delivery pile

15

Control with interface and input devices

16

Feed table with a unit for aligning the bow

17

main drive

18

suction head

20

lower tool

21

Upper tool with punches

23

Dividing grille or stripping board (lower tool)

24

Device for pressing force adjustment

25

Database

26

workflow integration

30

Upper tool (punching tool)

31

cutting blade

32

creasing knife

33

gumming

34

embossing cliché

100

Flatbed sheet punching and / or embossing machine (punching machine)

B

Sheet transport direction

e

Sheet transport plane

F

pressing force

l _s

Length of cutting knife

l _R

Length of knives

l _G

Length gum

A _p

Surface stamping cliché

Claims (8)

Method for adjusting the pressing force (F) of a flatbed punching and / or embossing machine (100), wherein the flatbed punching and / or embossing machine (100) at least one punching and / or embossing tool (30) for processing a laminar substrate (6), with the following steps: a) provision of tool data, which describe the individual structure of a punching and / or embossing tool (30) from a plurality of sub-tools (31, 32, 33, 34) b) reading specific force data from a database (26), wherein the specific force data assign a specific pressing force to a respective sub-tool (31, 32, 33, 34) c) calculation of a desired pressing force (F) at least from the tool data from a) and the specific force data from b) d) setting the pressing force (F) of the flatbed punching and / or embossing machine (100) to the desired pressing force according to c). Method for adjusting the pressing force according to claim 1,
with the extra step e) Correcting the pressing force (F) after a first punching or pressing operation by the machine operator. Method for adjusting the pressing force according to claim 1 or 2,
with the extra step f) storing the pressing force (F) for repeat orders. Method for adjusting the pressing force according to one of the preceding claims;
characterized,
that the tool data contains information on the type of a respective sub-tool (31, 32, 33, 34) and the effective length (l _s , l _R , l _G ) and / or the effective area (A _P ) of a respective sub-tool (31, 32, 33, 34). Method for adjusting the pressing force according to one of the preceding claims;
characterized,
that the specific force data, a required pressing force per effective length (l _s, l _R, L _G) or per effective area (A _P) of a respective tool part (31, 32, 33, 34) indicate. Method for adjusting the pressing force according to claim 5,
characterized,
that the specific force data depends on the substrate to be processed (6). Method for adjusting the pressing force according to one of the preceding claims,
characterized,
that in step c) additionally a security, distribution, number and / or size factor is used. Flatbed punching and / or embossing machine (100) with a machine control (15) for carrying out the method according to one of the preceding claims and with a workflow connection (26) and / or with an interface for transferring data from the pre-press to be processed Printing materials (6) and / or from the stamping and / or stamping tool production and / or with an interface for inputting tool data.

Images