EP2551078B1 - Device for stamping with adjustable distance between the rolls - Google Patents

Description

The invention relates to an apparatus for punching according to the preamble of claim 1 and a narrow web printing machine according to claim 10.

State of the art

Devices for punching flat multilayer material with punching cylinder and counter-punching cylinder are known. 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 cutting through 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 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 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 further known mechanical fine deliveries, with which the punching gap can be adjusted in the range of micrometers. 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 C 1 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. A further disadvantage is that the management of the power flow consuming machined mechanical components such as high-claimable bearer rings must be used.

task

Object of the present invention is to provide a device for punching and a narrow web printing machine with such a device, which provides a simple and accurate adjustment of the distance between the punching cylinder and Counter punch allows and thus at least reduces the disadvantages of the prior art.

This object is achieved by a device for punching with the features of claim 1. The device according to the invention, which can serve in particular the punching 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 distance between the punching cylinder and the counter-punching cylinder is adjustable. According to the stamping cylinder is clamped stationary by a clamping force; in other words, the punching cylinder is held in a fixed position by the action of a clamping force. The counter-punching cylinder is mounted displaceably in a guide, so that its position can be changed relative to the position of the punching cylinder. According to the invention, the punching device is designed so that the clamping force and the guide are aligned substantially at right angles to each other. This has the advantage that high punching forces can be generated because they can be passed through the horizontal guide of the counter punch cylinder in the housing of the device for punching and thus in the foundation of the punching device. It is also advantageous that bearer rings or support shafts can be omitted for guiding the power flow and thus a simpler structure of the device is made possible for punching.

In an advantageous embodiment of the inventive device for punching the punching cylinder is also mounted in a guide and the guides of counter-punching cylinder and punching cylinder are aligned substantially perpendicular to each other.

In a particularly advantageous and therefore preferred embodiment, the guide of the counter-punching cylinder is designed as a horizontal guide. The leadership of the punching cylinder can be designed as a vertical guide. Such aligned guides are preferred because they allow a short web run and thus reduced waste when setting up the device. (Horizontal means in the Substantially parallel to the base and footprint of the device, vertically means the vertical direction.)

In a further development of the device according to the invention, at least one of the guides has guide rails, for example in the form of guide grooves, in which the bearings of punching cylinders and counter-punching cylinders, for example in the form of bearing blocks with radial bearings, can be guided.

In an advantageous embodiment of the device according to the invention for punching, this has at least one drive for moving the counter-punching cylinder in his leadership. In an advantageous embodiment, a drive for fine adjustment or quick shutdown of the counter-punching cylinder can be performed, or it can be designed to set the register of punching cylinder and counter-punching cylinder. Quick shutdown means a quick disengage the cylinder, for example, in an emergency stop. It can be either multiple drives or one and the same drive. During the displacement of the counter-punching cylinder, the punching force can be maintained in an advantageous manner.

The invention also relates to a narrow web printing machine, in particular a label printing machine, with a device for punching as described above.

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 advantageous embodiments of the invention, reference is made to the dependent claims and the description of an embodiment with reference to the accompanying drawings.

embodiment

Figur 1

eine erste Ausführungsvariante einer erfindungsgemäßen Vorrichtung zum Stanzen

Figur 2

eine zweite Ausführungsvariante einer erfindungsgemäßen Vorrichtung zum Stanzen

Figur 3

eine Weiterbildung der Vorrichtung aus Figur 1

Figur 4

eine Übersichtsdarstellung einer Druckmaschine mit der erfindungsgemäßen Vorrichtung zum Stanzen

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

FIG. 1

a first embodiment of a device according to the invention for punching

FIG. 2

a second embodiment of a device according to the invention for punching

FIG. 3

a development of the device FIG. 1

FIG. 4

an overview of a printing press with the inventive device for punching

FIG. 1 shows a first embodiment of the punching device 10 according to the invention, which has a punching cylinder 1 and a counter-punching cylinder 2, which cooperate as tools and cause processing of transported in the transport direction T web-shaped material 144 (not shown). Between the punching cylinder 1 and the counter-punching cylinder 2 is a gap S; ie punching cylinder and counter-punching cylinders 1, 2 are spaced apart. In order to change the effect of the punching cylinder 1 on the web-shaped material 144 to be processed, the distance between the cylinders 1, 2, ie the gap S, can be changed. For this purpose, the counter-punching cylinder 2 in a guide 7, as shown by the double arrow v, slidably mounted. The counter-punching cylinder 2 can be moved in the horizontal direction along the guide 7. This shift can either be done manually or, as in the embodiment of FIG. 1 represented by means of a drive 9. The punching cylinder 1 is also mounted in a guide 6 and is held by a clamping force F in a stationary position. The orientation of the guide 6 and the clamping force F and the guide 7 are orthogonal to each other. This arrangement makes it possible that high punching forces can be generated and they can be routed via the horizontal guide 7 in the side walls of the device for punching 10, not shown, and thus in the foundation of the device 10.

In FIG. 3 is a development of the punching station 10 off FIG. 1 shown. In contrast to the device for punching 10 off FIG. 1 was a punching cylinder 1 with larger Diameter selected. Therefore, it is necessary to move the axis of rotation 3 of the punching cylinder 1 so that between the punching cylinder 1 and counter-punching cylinder 2, a gap S of desired size nevertheless arises. This is accomplished by inserting a shim 8 into the guide 6 of the punching cylinder 1 between the stop 5 of the guide 6 and the bearing of the punching cylinder 1. This causes the diameter compensation.

In FIG. 2 an alternative embodiment of the punching station 10 is shown. In contrast to the embodiment described above, the cylinder guides 6 and 7 were rotated by 90 °. This results in a substantially vertical transport direction of the web-shaped material 144 between punching cylinder 1 and counter-punching cylinder 2 therethrough.

In the FIG. 4 Figure 11 is a view of a preferred embodiment of a printing machine 100, more specifically, a narrow web label printing machine in a series construction, with printing units 110 following in the horizontal direction. The label printing machine is for processing a substrate 144 in web form. The substrate is unrolled from a substrate roll 146 in a feed section 148 of the printing press 142 and fed through a press machine 142 along a machine direction M path. The printing press 142 may have a plurality of frame modules 126, here by way of example three frame modules 26. In this embodiment, two printing units 110 or a printing unit 110 and a processing unit 150, in this case a punching unit for punching out the labels on the web-shaped substrate 144, are received on a rack module 126. After the individual processing stations follows an outlet part 152, in which the finished products are wound up in a label roll 154. Feeding part 148, rack modules 126 and outlet part 152 are detachably connected to each other so that a modular structure of the printing press 142 results.

In the illustration of the individual printing units 110, in this case flexographic printing units, in addition to the printing forme cylinders, the impression cylinders and the inking rollers, chambered doctor blades are also shown. Furthermore, the printing units 110 in the printing press 142 various drying devices: The counter-pressure cylinders are on the respective printing gap of the printing unit 110 downstream assigned UV drying devices, so that the printed substrate 144 can be dried directly on the impression cylinder. The printing units 110 also have web guiding rollers 160 for guiding the web-shaped substrate 144. In the embodiment shown, the fifth printing unit 110 comprises a hot air drying device 162. Alternatively, a UV or an IR drying device could also be used here. Subsequently, a punching unit 150 is arranged, which has a punching cylinder and a counter-punching cylinder as rotating tools. In addition or as an alternative to the stamping plant, it is also possible to use a stamping mill, for example a hot foil stamping mill.

As an alternative to the illustrated flexographic printing units, it is also possible to use offset printing units and rotary screen printing units.

LIST OF REFERENCE NUMBERS

1

punching cylinder

2

Counterpunch cylinder

3

Rotary axis punching cylinder

4

Rotary axis counter-punching cylinder

5

attack

6

Guide punch cylinder

7

Guide counter punch cylinder

8th

Shim (diameter compensation)

9

Drive counter punch cylinder adjustment

10

punching station

100

press

110

printing unit

126

rack module

144

substratum

146

substrate roll

148

feeding

150

Cutting

152

exit station

154

label roll

160

web guide

162

Hot air dryer

v

Displacement movement of the counter-punching cylinder

M

Machine direction

F

Clamping force punching cylinder

S

Gap (distance cylinder)

T

Transport direction web-shaped material

Claims (10)

1. Die-cutting device (10), in particular for die-cutting labels, including a die-cutting cylinder (1) rotatable about an axis of rotation (3) and a counterpressure cylinder (2) rotatable about an axis of rotation (4) that is essentially parallel to the axis of rotation of the die-cutting cylinder,
   wherein the distance (S) between the die-cutting cylinder (1) and the counterpressure cylinder (2) is adjustable,
   characterized in
   that a locking force (F) locks the die-cutting cylinder (1) in position and that the counterpressure cylinder (2) is displaceably supported in a guide (7) to adjust the distance (S) and that the locking force (F) and the guide (7) are essentially oriented to form a right angle.
2. Die-cutting device according to Claim 1,
   characterized in
   that the die-cutting cylinder (1) is supported in a guide (6) and the guides (6, 7) of the counterpressure cylinder (2) and of the die-cutting cylinder (1) are essentially oriented to form a right angle.
3. Die-cutting device according to any one of the preceding claims,
   characterized in
   that the guide (7) of the counterpressure cylinder is embodied as a horizontal guide.
4. Die-cutting device according to Claim 2 or 3,
   characterized in
   that the guide (6) of the die-cutting cylinder is embodied as a vertical guide.
5. Die-cutting device according to any one of the preceding claims,
   characterized in
   that at least one of the guides (6, 7) includes guide rails.
6. Die-cutting device according to one of the preceding claims,
   characterized in
   that the die-cutting device (10) has at least one drive (9) for displacing (v) the counterpressure cylinder (2).
7. Die-cutting device according to Claim 6,
   characterized in
   that one drive (9) is designed for the fine-adjustment of the counterpressure cylinder (2).
8. Die-cutting device according to Claim 6 and/or 7,
   characterized in
   that one drive (9) is designed for a quick-acting disengagement of the counterpressure cylinder (2).
9. Die-cutting device according to Claim 6 and/or 7 and/or 8,
   characterized in
   that one drive (9) is designed to adjust the register of die-cutting cylinder (1) and counterpressure cylinder (2).
10. Narrow-web printing press (100), in particular label printing press, comprising a die-cutting device (10) according to any one of the preceding claims.

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