EP2404720B1 - Device for rotating punching of flat multi-layer goods - Google Patents

Description

The invention relates to a device for punching according to the preamble of claim 1.

State of the art

The device is used for punching flat multilayer Good, and includes a punching cylinder and a counter-punching cylinder. At least one layer of the flat multilayer material can be punched in a punching gap formed by the punching cylinder and the counter-punching cylinder without completely severing all the layers, wherein the width of the punching gap is adjustable.

In this presentation, the term "punching" is used on the one hand in the narrower sense, which implies "severing", "perforating" or "punching", on the other hand understood in the broader sense as "shaping", ie "deforming" or "impressing". The same applies to similar grammatical forms, such as "stampable", which in the narrower sense as "severable", "perforable" or "hole" and in the broader sense as "embossable", "deformable" or "depressible" is understood. The term "punching" and similar grammatical forms are used only to simplify the illustration, but without limiting these connotations. Also, the terms "punch", "punching device" and "punching machine" are used interchangeably below.

When punching flat multilayered good, such as self-adhesive labels, especially in a device for punching in a printing press, an upper material, an overhead printing material (actual label material) and an adhesive layer must be punched (in particular severed) without damaging an underlying substrate, especially to cut. The punching process is material-dependent, so that a variation or adjustment of the device, for example the positions of their components or the punching strength, must be such that in a range of a few microns to a few tenths of a millimeter punching depth can be changed. Commonly punching takes place in a so-called Rotastanze (rotary punching) or a Rota carrier (rotary embossing): In a between a punching cylinder, which carries a punching or embossing mold, and a punching cylinder formed punching gap, the punching die or the stamping die acts on the flat multilayer Good, which undergoes a plastic change in the form of a cut or an impression. The flat multilayer Good may in particular be web-shaped.

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.

The disadvantage of such a solution, however, is that the height of the cutting edges of a punching die or embossing die received on the punching cylinder must be selected according to the size of the bearer rings and the height of the backing material. In other words, the punching tool must be made specifically for the job and the used punching device.

Alternatively, from the document DE 297 15 037 U 1 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 correlates 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 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.

Other punching devices go out of the DE 10 2005 016 779A1 . DE 10 2007 062 936 A1 . DE 10 2005 060 587 A1 . DE 10 2007 057 188 A1 . DE 10 2004 033 032 A1 and DE 29 12 458 OS out.

A disadvantage of the devices for punching, which allow adjustment of the distance of the punching cylinder and the counter-punching cylinder, is that only small adjustment paths are made possible. It is therefore not possible to place the two cylinders so far apart that a punch register setting is made possible. Another disadvantage is that the adjustment of the distance between the two cylinders is often accompanied by a small transverse adjustment of at least one of the cylinders, which causes register deviations.

From the US 5,156,076 is known to form the counter-punch cylinder as a hollow cylinder, which sits with play on the counter-punch cylinder shaft and is held by support rollers in position. This document may be considered closest to the state of the art.

task

Object of the present invention is therefore to provide a device for punching, which is a simple and accurate adjustment of the distance between Punching cylinder and counter punch cylinder allows and thus at least reduces the disadvantages of the prior art.

This object is achieved by a device for punching with the characterizing features of claim 1. The device according to the invention, which can serve in particular the stamping of labels, has a rotatable about a rotation axis punching cylinder and a rotatable about an axis counter-punching cylinder. The axes of rotation of punching cylinder and counter-punching cylinder are substantially parallel. The counter-punching cylinder has a cylinder body, which is designed in particular as a hollow cylinder. The two cylinders are assigned to successive rolling bearer rings. In an advantageous manner, a respective bearer ring associated with the counter punch cylinder is connected to a counter punch cylinder shaft. The cylinder body of the object cylinder is connected at its two ends by means of a respective sliding guide with the counter-punching cylinder shaft. This structure makes it possible to adjust the distance between the punching cylinder and the counter-punching cylinder.

In the device according to the invention has a respective slotted guide both a rotatably mounted on the counter-punch cylinder shaft sliding block and a backdrop for guiding the sliding block. The cylinder body of the counter-punching cylinder is rotatably mounted to the backdrop.

In an advantageous and therefore particularly preferred embodiment of the device according to the invention, the cylinder body of the counter-punching cylinder is linearly displaceable relative to the counter-punching cylinder shaft, in particular purely vertically, ie vertically, displaceably. This linear adjustment has the advantage that, in contrast to the eccentric adjustment according to the prior art, the punch register is not changed, is. Another advantage, for example compared to the eccentric adjusting devices according to the prior art, is that both an adjustment in the range of one-hundredth of a millimeter and an adjustment in a range of about 1 to 2 mm is made possible. The adjustment in the range of one hundredth of a millimeter, which can be done in steps of, for example, a thousandth of a millimeter, is used for setting the punch depth. The adjustment in the millimeter range allows the counter-punching cylinder to be completely turned off without having to move or disengage the gears of the drive train. If the device has a pressure bridge for punching, then this also does not have to be solved. The adjustment in the millimeter range allows both a quick shutdown and a rough register adjustment of the cylinder in the off state. Another advantage of the device according to the invention is that when a wear of the counter-punching cylinder only the cylinder body has to be replaced and the adjustment mechanism can be used further. Also come for the adjustment mechanism only centric parts are used, which - compared to parts with eccentric surfaces for adjusting devices according to the prior art - are easier to manufacture. Also, the punching forces can be easily absorbed by the device according to the invention and the power flow can be made uncritical.

To enable the rotational movements, in each case one rolling bearing is provided in an advantageous development between the counter-punch cylinder shaft and a respective sliding block. Also, in each case a rolling bearing can be provided between a respective gate and the cylinder body.

In a development of the device according to the invention, the device for punching has at least two support roller blocks for supporting the counter-punching cylinder. The distance between the support rollers of the support roller blocks to the punching cylinder is variable, so that the counter-punching cylinder can be delivered to the punching cylinder. It when the support roller blocks are provided with a device for changing the height of the support rollers, which is motorized and / or manually operable is particularly advantageous. The support rollers can be adjusted together or individually in their height, which allows a parallel adjustment or an oblique adjustment of the counter-punching cylinder to the punching cylinder.

In one embodiment variant of the device for punching, the bearer rings associated with the counter-punching cylinder are flange-mounted on the counter-punching cylinder shaft in a rotationally fixed manner.

In an advantageous development of the device for punching a suspension is provided in the region of a respective slotted guide, in particular with a plate spring package to prevent lifting of the counter-punching cylinder from the support rollers of the support roller blocks. In other words, the suspension ensures that the counter-punch cylinder rests permanently on the support rollers.

In development of the device for punching an anti-rotation is provided in the gate guide, which prevents rotation of the gate with the cylinder body of the counter-punching cylinder.

The described device for punching can be used within a label printing machine, in particular a flexographic printing press, for punching labels.

embodiment

• Fig. 1 eine Übersichtsdarstellung der erfindungsgemäßen Vorrichtung zum Stanzen
• Fig. 2 eine Ansicht auf den Bereich des Gegenstanzzylinders
• Fig. 3 einen Schnitt durch den Gegenstanzzylinder
• Fig. 4 einen Schnitt durch die Kulissenführung des Gegenstanzzylinders

The invention will be explained in more detail with reference to an embodiment. It show in a schematic representation

• Fig. 1 an overview of the inventive device for punching
• Fig. 2 a view of the area of the counter-punching cylinder
• Fig. 3 a section through the counter punch cylinder
• Fig. 4 a section through the slotted guide of the counter-punching cylinder

Fig. 1 shows an overview of the inventive device for punching 100, also referred to as a punching device or rotary die. This has a punching cylinder 1 and a counter-punching cylinder 2, between which a substrate 200 is transported through and undergoes a punching. The punching cylinder 1 and the Counter-punching cylinders 2 are rotatably mounted in side walls 22 of the punching device 100. The cylinders 1, 2 are each associated with bearer rings 3, 4. Thus, the punching cylinder 1 has at its two outer ends in each case a bearer ring 3. Right and left of the counter-punching cylinder 2 bearer rings 4 are provided. The punching cylinder associated bearer rings 3 and the counter punch cylinder associated bearer rings 4 roll on each other. Through the bearer rings 4, a force is absorbed by punching forces from the punching cylinder 1 via the bearer rings 3 of the punching cylinder 1. The positions of the punching cylinder 1 and the counter-punching cylinder 2 is ensured by support roller blocks 8 and 6 respectively. The support roller block 8 is assigned to the punching cylinder 1 and has a pressure bridge 9. About each provided with a knob spindles 12, the biasing force of the pressure bridge 9 can be adjusted. The counter-punching cylinder 2 is assigned to the support roller block 6. The support roller block 6 in this case has two support roller pairs, which are adjustable by means of an adjustment 7 together or separately in height (h). As a result, the delivery of the counter-punching cylinder 2 to the punching cylinder 1 takes place. The adjusting device 7 is driven by a drive 21 for changing the height of the support rollers. This can be done as shown by a small electric motor, alternatively or additionally, however, a manual movement can be provided.

The punching cylinder 1 is driven by a drive motor 13 via a gear train 15. In the presentation of Fig. 1 the drive motor 13 is mounted outside of the punch housing 14, but this may also be integrated within the punch housing 14 as well.

Fig. 2 shows a view of the counter-punching cylinder 2, which, however, is covered by a gear 15. Recognizable is a recessed into the side wall 22 of the punch housing 14 bearing 17 for the shaft 16 of the counter-punching cylinder 2. It can also be seen a rotation 18, which in connection with Fig. 4 will be described in more detail.

Fig. 3 shows a section through the counter-punching cylinder 2, which comprises a hollow cylindrical sleeve-shaped cylinder body 11. In the core hole or

within the hollow cylinder 17 is the shaft 16 of the counter-punching cylinder 2. An its outer ends, the shaft 16 is mounted in a bearing 17. At their ends on the shaft 16 in each case a bearer ring 4 is flanged with a drive gear 15. Via a slotted guide 5, 10 of the cylinder body 11 of the counter-punching cylinder 2 is connected to the counter-punching cylinder shaft 16. This slide guide 5, 10 ensures that the cylinder body 11 can undergo a vertical movement and so the distance between the counter-punching cylinder 2 and punching cylinder 1 can be adjusted. In this case, a height adjustment h of the support rollers of the support roller block 6 causes a height adjustment h 'of the cylinder body 11 of the counter-punching cylinder. The possible height adjustment of the cylinder body 11 is determined by the distance of the inner circumferential surface of the hollow cylinder 11 of the counter-punch cylinder shaft 16 and in Fig. 3 denoted by d.

In order to ensure that the cylinder body 11 bears permanently against the support rollers of the support roller block 6, a suspension with a cup spring package 20 is integrated in the bearing of the cylinder body 11. The free rotational mobility of the cylinder body 11 relative to the shaft 16 is achieved by roller bearings 19.

In Fig. 3 only one half of the counter-punching cylinder 2 is shown, since this is constructed symmetrically. Speak at his other end, not shown, the counter-punching cylinder 2 also has an analogously constructed link guide 5, 10th

The structure of the slotted guide 5, 10 is in Fig. 4 shown in more detail. A sliding block 5 is rotatably mounted on the counter-punching cylinder shaft 16 by means of a rolling bearing 19. The sliding block 5 is guided in a slide 10, which rotatably supports the cylinder body 11 of the counter-punching cylinder 2 by means of another rolling bearing 19. An anti-rotation device 18 ensures that the slide 10 is not rotated during the rotational movement of the cylinder body 11 and the height adjustment h 'of the counter punch cylinder body 11 takes place only in the vertical.

If the distance between punching cylinder 1 and cylinder body 11 of the counter-punching cylinder 2 are set, the drive 21 is controlled to change the height of the support rollers and by means of the adjusting device 7 is a height adjustment h of the support roller pairs of the support roller block 6. This height adjustment h causes a height adjustment h 'of the cylinder body 11 of the counter-punching cylinder 2, since the cylinder body 11 is supported by the slide guide 5, 10 so that it can perform a vertical movement relative to the counter-punching cylinder shaft 16. A parallel with respect to the axes of rotation adjustment of the cylinder body 11 to the punching cylinder 1 takes place when the two support roller blocks 6 experience the same height adjustment h. An oblique adjustment of the cylinder body 11 to the punching cylinder 1 relative to the axes of rotation thereof is achieved by the right support roller block 6 experiences a different height adjustment h from the left support roller block 6. If the counter-punching cylinder 2 is to be turned off quickly by the punching cylinder 1, both support roller blocks are lowered by the adjusting device 7 by approximately 1 to 2 mm.

• und liegt auf zwei Stützrollenböcken auf, wobei diese durch eine Verstelleinrichtung gemeinsam oder getrennt in der Höhe verstellbar sind und sowohl eine parallele Verstellung als auch eine Schrägverstellung des Gegenstanzzylinders zum Stanzzylinder ermöglich wird.

In an alternative embodiment, not shown, rotatably mounted sliding blocks are installed in the bearer rings of the counter-punching cylinder. These sliding blocks are secured against rotation relative to the punch housing. In the sliding blocks, in turn, the counter-punch cylinder body is rotatably mounted - analogous to the illustrated embodiment

• and rests on two Stützrollenböcken, which are adjustable by an adjusting device together or separately in height and both a parallel adjustment and an oblique adjustment of the counter-punching cylinder is made possible to the punching cylinder.

LIST OF REFERENCE NUMBERS

1

punching cylinder

2

Counterpunch cylinder

3

Schmitzring punching cylinder

4

Schmitzring counter punch cylinder

5

sliding block

6

Support roller block Counter punch cylinder (with support roller pair)

7

Adjustment device Support roller blocks (separate / shared)

8th

Support roller block punching cylinder

9

pressure bridge

10

scenery

11

Cylinder body counter punch cylinder (hollow cylinder)

12

spindle

13

drive motor

14

punching housing

15

gear

16

Shaft counter-punching cylinder

17

Bearings for shaft

18

Anti-twist gate

19

roller bearing

20

Belleville spring assembly

21

Device for changing the height of the support rollers

22

Side wall

100

punching device

200

Substrate (printed web with labels)

d

Adjustment range of cylinder body

H

Height adjustment support rollers

H'

Height adjustment counter punch cylinder

Claims (9)

1. Diecutting device (100), in particular for diecutting labels, including a diecutting cylinder (1) that is rotatable about an axis of rotation and a counterpressure cylinder (2) that is rotatable about an axis of rotation essentially parallel to the axis of rotation of the diecutting cylinder (1) and has a cylinder body (11),
   wherein both cylinders (1, 2) are assigned bearer rings (3, 4) rolling off on each other,
   wherein the spacing between the diecutting cylinder (1) and the counterpressure cylinder (2) is adjustable, and
   wherein a respective bearer ring (4) assigned to the counterpressure cylinder (2) is connected to a counterpressure cylinder shaft (16)
   characterized in
   that both ends of the cylinder body (11) of the counterpressure cylinder (2) are connected to the counterpressure cylinder shaft (16) by means of a respective connecting link guide (5, 10),
   that a respective connecting link guide includes a sliding block (5) arranged for rotation on the counterpressure cylinder shaft (16) and a connecting link (10) for guiding the sliding block (5), and that the cylinder body (11) of the counterpressure cylinder (2) is supported to be rotatable relative to the connecting link (10).
2. Diecutting device (100) according to claim 1,
   characterized in
   that the cylinder body (11) is designed as a hollow cylinder and the cylinder body (11) of the counterpressure cylinder (2) is linearly displaceable (D) relative to the counterpressure cylinder shaft (16), in particular in the vertical direction.
3. Diecutting device (100) according to claim 3,
   characterized in
   that a respective rolling contact bearing (19) is provided between the counterpressure cylinder shaft (16) and a respective sliding block (5).
4. Diecutting device (100) according to any one of the preceding claims,
   characterized in
   that a respective rolling contact bearing (19) is provided between a respective sliding block (10) and the cylinder body (11).
5. Diecutting device (100) according to any one of the preceding claims,
   characterized in
   that the diecutting device (100) includes at least two support roller blocks (6) for supporting the counterpressure cylinder (2) and
   that the spacing between the support rollers of the support roller blocks (6) and the diecutting cylinder (1) is variable to engage the counterpressure cylinder (2) with the diecutting cylinder (1).
6. Diecutting device (100) according to claim 5,
   characterized in
   that the diecutting device (100) includes a device (21) for modifying the height (21) of the support rollers of the support roller blocks (6), the device (21) being operatable by motor or by hand.
7. Diecutting device (100) according to any one of the preceding claims,
   characterized in
   that the bearer rings (4) assigned to the counterpressure cylinder (2) are flanged to the counterpressure cylinder shaft (16) so as to be fixed against rotation relative thereto.
8. Diecutting device (100) according to any one of the preceding claims,
   characterized in
   that a spring system (20) is provided in the area of a respective connecting link guide (5, 10), the spring system (20) in particular comprising a set of Belleville washers, to prevent the counterpressure cylinder (2) from lifting off the support rollers of the support roller blocks (6).
9. Diecutting device (100) according to claim 5,
   characterized in that
   a mechanism (18) to prevent rotation is provided in the area of the connecting link guide (5, 10) to prevent the connecting link (10) from rotating.

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