DE102005016779A1 - Flat multilayer commodity punching device for use in printing machine, has punching and counter punching cylinders, in which one is held in radially shiftable magnetic bearing to adjust breadth of punching gap between cylinders - Google Patents

Abstract

The device has punching and counter punching cylinders (1, 4) between which a punching gap is formed. The gap punches a layer of a flat multilayer commodity without cutting through the layers of the commodity. Triangulation sensors (7, 8) measure the breadth of the gap. One of the cylinders is held in a radially shiftable magnetic bearing (5, 6) to adjust the breadth of the gap based on the measured breadth. Independent claims are also included for the following: (A) a printing machine including a flat multilayer commodity punching device (B) a method for punching flat multilayer commodity.

Description

The Invention relates. a device for punching flat multilayer Good, which includes a punching cylinder and a counter-punching cylinder and in which at least one layer of the flat multilayer Good in a formed by the punching cylinder and punching cylinder Punching gap is punched, without all layers completely closed cut through, wherein the width of the punching gap is adjustable. Furthermore, the invention relates to a method for punching flat multi-layered good, in one by a punching cylinder and a counter punch cylinder formed punching gap whose width is adjustable, wherein at least one layer of the flat multilayer Good puncturing in the die-cut gap without completely covering all layers cut.

In In this representation, the term "punching" is used on the one hand in the narrower sense, which implies "severing", "perforating" or "punching", on the other hand also understood in the broader sense as "shaping", ie "deforming" or "impressing". The same applies to similar grammatical forms, such as "punchable", which in the narrower sense is "severable", "perforatable" or "puncturable" and in the broader sense Meaning is understood as "impressionable", "deformable" or "depressible". Just to simplify the presentation, but without limitation addressed connotations are the term "punching" and the like used grammatical forms.

At the Punching of flat multilayer material, for example self-adhesive labels, in particular in a device for punching in a printing machine, have to an upper, an overhead material for printing (actual Label material) and an adhesive layer punched (in particular cut through), without an underlying carrier material to hurt, especially to sever. The punching process is depending on the material, allowing a variation or adjustment of the device, for example the positions of their components or the punching strength, so must be done that in a range of a few microns up a few tenths of a millimeter, the punch depth can be changed. Commonly done punching in a so-called Rotastanze (rotary punching plant) or a red bearer (Rotary embossing machine): In one between a punching cylinder, which a punching or a stamping mold wearing, and a punching gap formed by a punching cylinder acts the punching die or the stamping mold on the flat multi-layered good, which is a plastic change in Form of a cut or imprint learns. The flat multi-layered Good, in particular, can be web-shaped be.

For example, from the document DE 6602393 It is known that the punching cylinder and the counter-punching cylinder of a device for punching can have bearer rings, which roll on one another, so that the punching cylinder and the counter-punching cylinder are supported on one another. An adjustability of the punching gap and thus the punching depth can be effected in that the contact pressure, in some cases with drastic deformation of the bearer rings, is varied. In a punching but high force peaks can occur, which can lead to a temporary deformation of the bearing bearing punching frame. A change in the width of the punching gap, caused by the deformation, but leads to a poor punching result. If the bearer rings are preloaded with high contact forces, premature wear of bearer rings, running surfaces and bearings can result.

adversely in such a solution but that is the height the cutting of a cutting die received on the punching cylinder or embossing mold according to the size of the bearer rings and the height of the carrier material chosen have to be. In other words, the punching tool must be special for the job and the inserted device are made for punching.

There are also known mechanical fine deliveries with which the punching gap can be adjusted in the micrometer range. Typically, such a mechanical fine delivery with eccentrically adjustable Schmitzringen can be realized. For example, such devices are in the documents EP 0 899 068 A2 and DE 198 14 009 C1 disclosed.

Alternatively, from the document DE 297 15 037 U1 It is known to realize a mechanical fine delivery by means of conical rollers mounted on the axes of the punching cylinders and counter-punching cylinders. The conical rollers are in mutual contact such that at least one of the axes relative to the other of the axes simultaneously or correlated radially and axially displaceable, so that a variation of the width of the punching gap is achieved.

From the document US 4,359,919 It is known to provide further bearings for the punching cylinder and the counter-punching cylinder, which are supported on abutment surfaces in an intermediate piece on each other. An abutment surface of one of the two abutting bearings is chamfered and a wedge-shaped element is provided between the abutment surfaces, so that the thickness of the intermediate element can be varied by varying the position of the wedge-shaped element.

There it is in the proposed solutions to purely static adjustment there is no guarantee that the punching gap is not due to dynamic loads dependent on changed the punching contour. Optionally, when using the proposed solutions a very robust mechanical construction with a corresponding disadvantageous high space requirements and relatively high costs required.

task The present invention is an apparatus for punching to create flat multi-layered good, the cutting gap both static as well as dynamically adjustable.

These The object is achieved by a Apparatus for punching flat multi-layered good with the Features according to claim 1 solved. Advantageous developments of the invention are characterized in the dependent claims.

A inventive device for punching flat multilayer material, comprises a punching cylinder and a counter punch cylinder. At least one of the punching cylinders and counter punch cylinder is in at least one (preferably several) radially adjustable magnetic bearing rotatably received. The flat Multi-layered Good is provided by one of the punching cylinder and counter-punching cylinder formed punching gap whose width is adjustable moves. At least a layer of the flat multilayer material is in the punching gap punchable without completely cutting through all layers.

By the use of at least one radially adjustable magnetic bearing, which is a variation or definition of the axial distance of the Punching cylinder and the counter punch cylinder allowed, is the punching gap, So the area between the peripheral surfaces of the punching cylinder and the counter punch cylinder both static and dynamically adjustable: Advantageously, the at least one (preferably all) Magnetic bearings electronically controlled (controlled or regulated), so that the width of the punching gap electrically parameterizable and thus easily determinable (measurable and / or controllable). The width of the punching gap is determined by the distance of the shafts of the punching cylinder and the counter punch cylinder determined. The amount of width can as the distance of the peripheral surfaces of punching cylinder (without received punched or embossed mold provided with raised tools) and counter punch cylinder be defined. The reproducibility of a required or desired Hiring is automated and facilitated. A more elaborate mechanical construction for the Fine delivery is no longer necessary, especially at appropriate execution the at least one magnetic bearing to be omitted on bearer rings. In other words, According to the invention is a Fine delivery achieved by magnetic bearings. The invention creates a variable punch depth feed in a punching device.

When Another advantage is the absence of bearer rings and the freely configurable setting of the punching gap, that a punching mold, in particular if this is designed as a stamped sheet, independently from the material to be punched and from the concrete embodiment the device used for punching or reused can be. For a new punching job, the width of the punched gap becomes simply and quickly newly parameterized electronically.

The flat multilayer Good may be in particular web-shaped. In particular, it may be a web for self-adhesive labels or a Act of self-adhesive labels. Web-shaped flat multilayer Good may be in particular a substrate web.

Of Another can in the inventive device for punching at least one of the punching cylinders and counter-punching cylinders in at least one (Preferably, a plurality of) axially adjustable magnetic bearing rotatably received be. In this advantageous development, for example an alignment of the device for punching, more precisely one the punching cylinder recorded punching tool, transverse to the transport direction of the flat multilayer material through the die-cutting gap by electronic Actuation of the at least one axially adjustable magnetic bearing respectively. Thus, the page register of the device for punching in a simple and convenient way electrically parameterized and thus determinable (measurable and / or controllable).

In a particular embodiment can in the device according to the invention for punching both the punching cylinder and the counter-punching cylinder each rotatably received in radially adjustable magnetic bearings be.

In preferred embodiment can in the device according to the invention the width of the punching gap between the punching cylinder and the counter-punching cylinder by means of at least one sensor, for example a triangulation sensor, which is measured by the device.

It is particularly advantageous if the punching device according to the invention is in operative connection with an electronic control unit and / or regulating unit, which has an on position of the width of the punching gap by controlling the at least one (preferably all) radially adjustable magnetic bearing allows. In other words, via an electronic control unit and / or control unit, the magnetic field in the at least one (preferably all) adjustable magnetic bearing in the desired sense be influenced so that the radial position of the recorded by the bearing punching cylinder or counter-punching cylinder is adjusted. A dynamic control or a dynamic control is possible.

On this way is a mechanical bias to compensate for a Punching frame deformation associated with high punching forces encountered not necessary or avoidable. To absorb the high forces, becomes the actual value directly measured by the sensor the width of the cutting gap (or another size, which is a measure of this current actual value) on the position control or position control returned to the magnetic bearing. A direct measurement and an associated dynamic adjustment option allows the mechanical construction of a realization of the device according to the invention less rigid for punching.

alternative to or above In addition, in the device according to the invention for punching flat multi-layered good at least one the punching cylinder and counter-punching cylinder, which in at least is rotatably received a radially adjustable magnetic bearing, be included in at least one other camp, which in the currentless Condition of the magnetic bearing absorbs occurring forces. In this way will be beneficial damage the magnetic bearing avoided in the de-energized state.

The inventive device for punching can in a rotary stamping or in a rotary embossing a Printing machine for printing self-adhesive labels for use reach. In other words, a printing machine according to the invention for printing of self-adhesive labels is characterized by at least one device for punching flat multilayer material according to this illustration.

in the The inventive idea is also related to a process for punching flat multi-layered goods, in one by a punching cylinder and a counter punch cylinder formed punching gap whose width is adjustable. At least one radially adjustable magnetic bearing, in which either the punching cylinder or the counter-punching cylinder is rotatably mounted, is adjusted in the radial direction, before at least a layer of the flat multilayer material punched in the punching gap is complete without all layers to sever. The method can be used to preset the device be used for punching or for adjusting the device. To control a dynamic compensation are as input variables in particular the amount of punching force and / or a feedforward control on the basis the known shape of a die or embossing mold advantageous. The strength of Punching force can indirectly by means of the magnetic bearing forces (reaction on the bearings).

In special embodiment of the method according to the invention, the amount the adjustment in dependence an inserted punching die (stamped sheet) or stamping die, more precisely, the structuring of the stamping die or embossing mold or the Position and shape of surveys of recorded tools, and / or a type of material of the flat multilayer material and / or the thickness of the material of the flat multilayer material determined become. In other words, an automatic adaptation of the electrically parameterizable punching gap can for different punching orders be made.

Of further or alternatively in a development of the method according to the invention the position and / or the forces the radially adjustable magnetic bearing dynamically during punching changed become. In this advantageous manner, load surges, which, for example, unfavorable lying Stamping lines, in particular cross cuts occur, reduced or compensated. When punching can partially the carrier material a flat multilayer material under a cutting edge of the die be compressed. By dodging the carrier there is a risk that the upper is not complete is punched, so that a poor or poor punching result results, possibly the punching is even impossible. By means of the electronic dynamic adjustment of the width of the Punch gap can be the compression of the substrate at the time of cutting be compensated, so that a better punching result achievable is.

In particular embodiment can in this further connection of the method according to the invention, the position and / or the forces the radially adjustable magnetic bearing periodically according to a pilot profile while the punching changed become. If the load behavior (temporal load profile, in particular the time sequence of load surges) periodically occurs at known positions of the punch cylinder and either is known or measured, a necessary Vorsteuerungsprofil be anticipated. In this way, a reduction is advantageous or compensation of the temporal load profile possible.

Further Advantages and advantageous embodiments (Variants) and further developments of the invention will become apparent from the following Figures and their descriptions shown. It shows in detail:

1 an embodiment of a device for punching with a counter-punching cylinder, which is accommodated in magnetic bearings,

2 an embodiment of another bearing (backup bearing) in a further development of the device according to the invention for punching,

3 an embodiment of a device for punching with a punching cylinder, which is accommodated in magnetic bearings, and

4 an embodiment of a toothed belt drive of a punching cylinder in a device according to 3 , and

5 a schematic representation of a cylinder assembly in a printing unit of an embodiment of a printing press according to the invention.

The 1 shows an embodiment of a device for punching with a counter punch cylinder, which is accommodated in magnetic bearings. In this embodiment, the size or width of the die gap between a punching cylinder 1 and a counter punch cylinder 4 by means of a first and a second radially adjustable magnetic bearing 5 . 6 of the counter-punch cylinder 4 established. A transverse displacement or axial displacement of the here unstructured counter punch cylinder 4 however, has no effect on the transverse displacement of the punching result. For this reason, in the arrangement shown here no controlled or controlled transverse displacement is performed.

In a typical rotary stamping different format lengths are punched, for this reason, the punching cylinder 1 can be changed, so that punching cylinder 1 can be used with different circumferential length or radius, short different size. The punching cylinder 1 can either be a cylinder with a built-in punching or a cylinder equipped with magnets, the magnetic force by a punching die 12 , in particular a stamped sheet, holds, as it is in the 1 outlined.

In the in 1 Shown embodiment, the punching cylinder 1 with the help of ball screws 2 . 3 moved according to the size of the punching cylinder on a defined punching gap. The punching gap can be selected so that the punching die 12 not yet or slightly engaged. The counter punch cylinder 4 has a substantially fixed position: For storage of the counter-punching cylinder 4 serve two radially adjustable magnetic bearings 5 . 6 , The magnetic bearings 5 . 6 allow it by means of electronic control (control or regulation) an eccentricity of the counter-punching cylinder 4 with respect to a central or symmetrical axis of the magnetic bearings 5 . 6 adjust. This eccentricity is used to fine tune the width of the die gap. Furthermore, the eccentricity can be used to engage and disengage the punching die. Compared to the stroke of the ballscrews 2 . 3 is the radial displacement of the magnetic bearings 5 . 6 low, it is typically only a few tenths of a millimeter.

An essential requirement for the stamping process is that the die gap remains constant even under the influence of high punching forces. With the help of a first sensor 7 and a second sensor 8th the size or width of the die gap is measured and placed on a, in 1 not shown electronic control unit, in further development electronic control unit, the magnetic bearing 5 . 6 switched. For an optionally carried out position control of the magnetic bearing 5 . 6 These are accordingly equipped with further sensors for detecting the actual position of the respective magnetic bearing, which are also not shown here in detail. The values measured by the sensor (s) can be fed to a position controller (part of the electronic control unit) which also processes the current measured value of the width of the punched gap so that a signal for controlling the radially adjustable magnetic bearings can be obtained until a desired setpoint value is reached. Value for the width of the punching gap has been achieved.

The punching cylinder 1 is from a motor 11 by means of a toothed belt 18 , a first pulley 9 and a second pulley 10 driven. The motor 11 can be carried out independently of the main drive of a printing press, in which the apparatus shown for punching integrated.

The 2 is an embodiment of another camp 13 , Also referred to as fishing camp, in further development of the device according to the invention for punching. In the de-energized state of the magnetic bearings 5 . 6 can be the position of the axis of the counter punch cylinder 4 no longer be determined. Another camp 13 , in particular a conventional bearing, picks up the axle and prevents it from being in direct contact with the magnets of the magnetic bearing 5 . 6 comes. In a simple design, the other camp 13 consist of a plastic sleeve.

The 3 refers schematically to an embodiment of a device for punching with a punching cylinder 1 in a first and a second magnetic bearing 5 . 6 is included. The embodiment shown here allows in addition to the setting of the punching gap an axial adjustment or transverse adjustment of the punching cylinder 1 , and thus the cutting die 12 or the punching tool, so that adjustment of a side register or a lateral correction in the transverse direction to the transport direction of flat multilayered good is possible by the punching apparatus.

As already related to the 1 explained, are different sized punching cylinder 1 used. In the in 3 the embodiment shown is the counter-punching cylinder 4 with the help of a first and a second ball screw 2 . 3 according to the size of the punching cylinder 1 driven on a defined punching gap. The punching gap can be selected so that the punching die 12 not yet or slightly engaged.

The punching cylinder 1 has a substantially fixed position: For storage of the counter-punching cylinder 4 serve two radially adjustable magnetic bearings 5 . 6 , The magnetic bearings 5 . 6 allow it by means of electronic control (control or regulation) an eccentricity of the punching cylinder 1 with respect to a central or symmetrical axis of the magnetic bearings 5 . 6 adjust. This eccentricity is used to fine tune the width of the die gap. Furthermore, the eccentricity can be used to engage and disengage the punching die. Compared to the stroke of the ballscrews 2 . 3 is the radial displacement of the magnetic bearings 5 . 6 low, it is typically only a few tenths of a millimeter.

An axially adjustable magnetic bearing 14 Moreover, it allows the axial position of the punching cylinder 1 adjust. An axial adjustment serves to adjust the punching image in the transverse direction to the transverse direction to the transport direction of flat multilayer Good by the device for punching, for example, to correlate it with a printed image on the flat multilayer Good. Instead of a radially adjustable magnetic bearing 5 and an axially adjustable magnetic bearing 14 to use in separate execution, as in the 3 is shown, a combined magnetic bearing, which is both radially and axially adjustable, can be used, so that in integration both the axial and the radial position of the punching cylinder 1 can be adjusted independently of each other.

So the punching cylinder 1 easy to change is a bracket 15 of the first magnetic bearing 5 designed as a folding bearing. The holder 15 can be moved away from the device for punching and around the fulcrum 16 from the wave 19 of the punching cylinder 1 be worked away. Another support camp 17 takes the force of the folded state of the holder 15 unilaterally mounted shaft 19 on.

As already in the embodiment according to 1 can also in this embodiment according to 3 with the help of a first sensor 7 and a second sensor 8th the size or width of the die gap are measured and placed on a, in 3 not shown electronic control unit, in further development electronic control unit, the magnetic bearing 5 . 6 be switched on. For an optionally carried out position control of the magnetic bearing 5 . 6 These are accordingly equipped with further sensors for detecting the actual position of the respective magnetic bearing, which are also not shown here in detail. The values measured by the sensor (s) can be fed to a position controller (part of the electronic control unit) which also processes the current measured value of the width of the punched gap so that a signal for controlling the radially adjustable magnetic bearings can be obtained until a desired setpoint value is reached. Value for the width of the punching gap has been achieved.

The punching cylinder 1 is from a motor 11 by means of a toothed belt 18 , a first pulley 9 and a second pulley 10 driven. The motor 11 can be carried out independently of the main drive of a printing press, in which the apparatus shown for punching integrated. Because the wave 19 can shift axially, in this embodiment, the first pulley 9 on the wave 19 slidably executed. Alternatively, in a simpler embodiment, the second pulley 10 wider than the timing belt 18 be executed. With an axial displacement of the shaft 19 is like the timing belt 18 shift out by placing a new position on the second pulley 10 occupies. By varying the position of the shaft 19 in the radial direction, the center distance between the motor shifts 11 and the wave 19 , Since the displacement is in the range of a few tenths of a millimeter, no special precautions must be taken as a rule.

In the 4 is a schematic representation of an embodiment of a toothed belt drive of the punching cylinder 1 in a device according to 3 shown. In the case of larger adjustment paths, an arrangement can be used, which serves to compensate for the shaft displacement. Changes the shaft spacing and thus the distance of the second pulley 10 , so shorten or extend a first route 20 and a second route 21 of the toothed belt 18 by the same amount, ie the total length along the toothed belt 18 stay constant.

In the 3 is further shown that the punching cylinder 1 is formed in a hollow cylindrical or sleeve-shaped. Such an expression of the punching cylinder 1 can also be called a sleeve. The punching cylinder 1 comes with a first cone 22 and a second cone 23 held. The first cone 22 is stuck with the wave 19 connected, the second cone 23 is movable and braces the cylinder. The bracing can be done for example by means of a thread. In addition, however, many other embodiments for the realization of a tension are conceivable and known from the relevant prior art. In the in 3 the embodiment shown is the shaft 19 continuous. Alternatively, however, in other embodiments, the shaft 19 be shared. The wave 19 can with the first cone 22 ends and with the second cone 23 start again, so measure only the individual listed bearings.

The 5 is a schematic representation of a cylinder arrangement in a printing unit of an embodiment of a printing press according to the invention. In general, printing unit constructions are less rigid than stamping. For this reason, it has not been possible to simply swap the forme cylinder of the printing unit for a punching cylinder in order to carry out punching in the printing unit.

With the help of the inventive storage of a punching cylinder or a counter-punching cylinder in magnetic bearings, however, the punching gap, however, can be actively adjusted, although the printing unit frame yields briefly under force surges. Exemplary is in 5 the arrangement of a flexographic printing shown. Web-shaped flat multilayer material or a substrate web runs over an impression cylinder 25 , A printing form cylinder 26 , in particular flexographic printing cylinder, is from an anilox roller 27 colored and transmits his image on the substrate web. The printing plate cylinder 26 can against a radially adjustable magnetic bearings 5 . 6 recorded punching cylinder 1 be replaced to create a device according to the invention for punching. With the help of monitoring or measuring the width of the punching gap during the stamping process and a dynamic control of the magnetic bearing of the punching cylinder, the punching gap can be kept constant even during the force peaks.

1

punching cylinder

2

first Ball screw

3

second Ball screw

4

Counterpunch cylinder

5

first radially adjustable magnetic bearing

6

second radially adjustable magnetic bearing

7

first sensor

8th

second sensor

9

first pulley

10

second pulley

11

engine

12

die

13

additional camp

14

axial adjustable magnetic bearing

15

bracket

16

pivot point

17

additional support bearings

18

toothed belt

19

wave

20

first route

21

second route

22

first cone

23

second cone

24

flat multi-layered good

25

Impression cylinder

26

Plate cylinder

27

anilox roller

Claims (10)

Apparatus for punching flat multi-layered goods, which comprises a punching cylinder ( 1 ) and a counter punch cylinder ( 4 ) and in which at least one layer of the flat multilayer material in one of the punching cylinder ( 1 ) and counter-punching cylinders ( 4 ) punched-through gap without completely cut through all the layers, wherein the width of the punching gap is adjustable, characterized in that at least one of the punching cylinder ( 1 ) and counter-punching cylinders ( 4 ) in at least one radially adjustable magnetic bearing ( 5 . 6 ) is rotatably received. Apparatus for punching flat multilayer material according to claim 1, characterized in that at least one of the punching cylinders ( 1 ) and counter-punching cylinders ( 4 ) in at least one axially adjustable magnetic bearing ( 14 ) is rotatably received. A device for punching flat multilayer material according to claim 1 or 2, characterized in that the device comprises at least one sensor for measuring the width of the punching gap between the punching cylinder ( 1 ) and the counter punch cylinder ( 4 ) having. Apparatus for punching flat more layered material according to one of the preceding claims, characterized in that the device is in operative connection with an electronic control unit and / or control unit, which adjustment of the width of the punching gap by controlling the at least one radially adjustable magnetic bearing ( 5 . 6 ). Device for punching flat multilayer material according to one of the preceding claims, characterized in that the at least one of the punching cylinders ( 1 ) and counter-punching cylinders ( 4 ), which in at least one radially adjustable magnetic bearing ( 5 . 6 ) is rotatably received, in at least one other bearing ( 13 ) is received, which absorbs forces occurring in the de-energized state of the magnetic bearing. Printing machine for printing self-adhesive labels, characterized by at least one device for punching flat multilayer good according to one of the preceding claims. Method for punching flat multilayer material, in one by a punching cylinder ( 1 ) and a counter punch cylinder ( 4 ) formed, whose width is adjustable, wherein at least one layer of the flat multilayer material is punched in the die gap, without completely severing all layers, characterized in that at least one radially adjustable magnetic bearing ( 5 . 6 ) in which either the punching cylinder ( 1 ) or the counter punch cylinder ( 4 ) is rotatably mounted, is adjusted in the radial direction, before the at least one layer of the flat multilayer material is punched. A method of punching flat multilayer material according to claim 7, characterized in that the amount of adjustment in dependence of a punching die used ( 12 ) or stamping shape and / or a type of material of the flat multilayer material and / or the thickness of the material of the flat multilayer material is determined. Method for punching flat multilayer material according to claim 7 or 8, characterized in that the position and / or the forces of the radially adjustable magnetic bearing ( 5 . 6 ) are changed dynamically during punching. Method for punching flat multilayer material according to claim 9, characterized in that the position and / or the forces of the radially adjustable magnetic bearing ( 5 . 6 ) are changed periodically according to a feedforward profile during punching.