EP2759397A2 - Rotation stamping device with tensioning system and angle adjustment - Google Patents

Abstract

The rotation stamping unit (1) has a drive shaft (12,13) and a stamping tool, which has a roller body (4,6), a clamping system and a tool sleeve (5), where the tool sleeve is clamped on the roller body with the clamping system. The clamping system has a clamping ring, which is arranged between the roller body and the tool sleeve. The clamping ring stays in engagement with an adjustment unit for rotating the clamping ring for angular adjustment of the tool sleeve about a rotational axis of the stamping tool.

Description

The invention relates to a rotary embossing device according to the preamble of claim 1 and 5.

State of the art

Folding cartons are cardboard or corrugated board packaging, and to a lesser extent plastic, which are glued at one or more points during the folding process, depending on the design. They are usually produced from a blank. The blanks are usually punched out in a flatbed or rotary die-cutting machine. The blank must be folded on several lines and glued at least at one edge. When folded flat, the folded boxes come out of the carton gluer and can be stacked compact or packed in cartons. The placement and filling of the boxes can be done mechanically in packaging machines or manually.

In addition to the folds required for the production of folding cartons, further creasing lines in the folding carton gluing machine are pre-broken (prefolded) in preparation for the subsequent production step. This facilitates the installation of the box and the subsequent filling.

If the cartons are used to package medicines, it is legally required to apply the name of the medicament in braille (so-called Braille) to the carton (eg by embossing). Also in so-called blister cards is often the requirement that braille or other imprints must be applied.

According to the state of the art, embossing of the braille is carried out either during the stamping process in the punching machine during the production of the blanks. This is however consuming, since a punching sheet several benefits, ie blanks contains and for each benefit a pair of tools consisting of die and patrix must be provided. Or there are rotary embossing devices with two rotating embossing tools are used, which may for example be part of a Faltschachtelklebemaschine.

The known Braille stamping devices usually consist of an upper rotary tool, the Braille male and a lower rotary tool of the Braille die. The Braille patrix has a predetermined number of raised Braille embossing points on its embossing side. The Braille matrix usually has the maximum possible number of Braille point wells; It is therefore designed as a universally applicable matrix. The number of depressions depends on whether the Braille embossing used is the usual 6-point basic shape or the 8-point basic shape.

In particular, in the manufacture of packaging for pharmaceuticals a variety of different Braille embossing is necessary. For this, the Braille male must be changed with each new order to be made, so that a large number of Braille patricks must be kept in the tool store.

To relieve the storage, it is from the DE 20 2008 017 133 U1 known to leave the roll body unchanged and only to change the tool. The tool is attached by means of magnets on the lateral surface of the roller body and held during operation.

The DE 10 2010 036 011 A1 shows a tool for a rotary embossing device for embossing flat, curved material. The device has two rotary embossing tools in the form of a male and a die for introducing the embossments. At least the male part consists of a roller body, on which a closed, annular tool sleeve or a slotted tool sleeve is attached. The tool sleeves are fixed by clamping systems described in more detail. The tool sleeve of the male has on its outer shell job specific raised embossing points. These interact with corresponding depressions in the outer shell surface of the order-neutral die.

The disadvantage of such clamping systems are their high inertia forces, which may result in imbalances, and the heavy accessibility by the machine operator, which makes changing the embossing sleeves complicated and time-consuming.

Another disadvantage is that when two or more embossing dies are mounted on the same drive shaft, no relative synchronization of both is possible. Due to manufacturing tolerances, however, such synchronization for the production of high-quality printed products is required. This is especially true for coining legally prescribed braille. Known from the prior art, it is only to synchronize the embossing die relative to the associated embossing die by rotating their drive shafts to each other. With this method, however, only both (or more) embossing matrices can be corrected by an equal angular degree.

task

Object of the present invention is to provide a rotary embossing device, which allows easy installation and adjustment of a tool sleeve and thus at least partially solves the disadvantages of the prior art.

This problem is solved by a rotary embossing device having the features of claims 1 and 5.

The rotary embossing device according to the invention is used for embossing sheet-like materials such as sheet, utility and webs of paper, cardboard, plastic and composite materials with a drive shaft and an embossing tool mounted thereon, wherein the embossing tool has a roller body, a clamping system and a tool sleeve, wherein the tool sleeve with the Clamping system is stretched on the roll body. Furthermore, one on a parallel further drive shaft be provided mounted rotary counter tool. For processing the sheet material, this is then transported between the two tools. According to the invention, the clamping system has at least one clamping ring, which is arranged between the roller body and the tool sleeve and serves to clamp the tool sleeve. In contrast to clamping systems known from the prior art, the clamping ring has a lower mass moment of inertia. Advantageously, the at least one clamping ring is connected to an adjusting device for rotating the at least one clamping ring for adjusting the angle of the tool sleeve about an axis of rotation of the embossing tool. There is thus also a rotation of the tool sleeve relative to the drive shaft. The twisting takes place by a displacement of the clamping ring along the preferably cylindrical surface of the roller body. This ensures that the clamping ring and thus the tool sleeve can be adjusted in its angular position relative to the drive shaft and thus also relative to an optionally existing counter tool. If there are several embossing tools on one and the same drive shaft, then it is possible for the tool sleeves of the embossing tools to undergo a different angle adjustment, and thus the tool sleeves to be adjusted relative to one another.

In a particularly advantageous and therefore preferred development of the rotary embossing device according to the invention, the adjusting device has a particularly axially displaceable positioning, which is associated with a particular mounted inside the roller body adjustment mechanism, wherein the clamping ring has on its inner surface a groove and the positioning element is displaceable in the groove, wherein the displacement causes an adjustment of the clamping ring. The groove in the clamping ring is aligned in particular at an acute angle to the axial direction. The adjustment mechanism is easily accessible from outside the embossing tool, so that the machine operator can make an adjustment of the clamping ring in a simple manner by actuating the adjusting mechanism. Another advantage results from the fact that the adjustment is very compact and has only a small moment of inertia.

In an alternative embodiment of the rotary embossing device according to the invention, the adjusting device has an eccentric disk mounted in the roller body, the rotation of which causes an adjustment of the clamping ring.

In a further alternative embodiment, the adjusting device has a worm gear and the clamping ring has a toothing on its inner surface. By a rotation of the worm wheel, which is transmitted via the spur gear and the toothing on the clamping ring, an adjustment of the clamping ring is effected.

The invention also relates to a rotary embossing device, in particular as described above, wherein the clamping system according to the invention has a clamping ring, which is arranged between the roller body and the tool sleeve, for clamping the tool sleeve. Advantageously, the clamping ring has at least one elastomeric ring and the clamping system further comprises an axially displaceable clamping cover for pressing the at least one elastomeric ring. The pressing of the at least one elastomer ring by the clamping cover causes a radial expansion of the at least one elastomeric ring, whereby the tool sleeve is clamped. By this embodiment of the rotary embossing means a very simple clamping of the tool sleeve is made possible in an advantageous manner: The tool sleeve can first be pushed onto the clamping ring, then the tool sleeve is clamped by turning the clamping cover and thus secured to the roller body.

In a particularly advantageous and therefore preferred embodiment of the rotation device according to the invention, the clamping ring has a plurality of elastomer rings and in each case between two elastomer rings each have a particular rigid spacer ring. As a result, the clamping force of the clamping system can be distributed particularly uniformly and act on a large surface on the tool sleeve, so that the tool sleeve is held particularly secure.

In an advantageous development of the roller body at least at one end of an external thread and the clamping cover has a complementary internal thread for screwing the clamping cover on the roller body, whereby the clamping ring is fixed to the roll body. At the same time screwing the clamping lid causes an axial displacement of the clamping cover and thus causes a pressing of the at least one elastomeric ring.

As the elastomer, in particular, an acrylonitrile-butadiene rubber can be selected.

In a first embodiment, the tool sleeve is tubular and has a closed lateral surface. In a second alternative embodiment, the tool sleeve is also tubular, but with a slotted lateral surface. In the second case, the clamping ring in a particularly advantageous embodiment, a joining piece and the two longitudinal edges of the tool sleeve are, in particular form-fitting, connectable to the joining piece. At the joining piece and the elastomer rings and spacers can be attached. Also, the groove of the adjusting device can be introduced into the joining piece.

Advantageously, the tool can be used in a Braille embossing device in a Faltschachtelklebemaschine.

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 attached 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 perspektivische Darstellung einer Prägevorrichtung mit einer erfindungsgemäßen Prägeeinrichtung

Figur 2

die Prägeeinrichtung in einer Explosionsdarstellung

Figur 3

eine alternative Ausführungsform der Prägeeinrichtung

Figur 4a-4b

zwei alternative Ausführungsvarianten einer Winkelverstelleinrichtung

It show in a schematic representation

FIG. 1

a perspective view of an embossing device with an embossing device according to the invention

FIG. 2

the embossing device in an exploded view

FIG. 3

an alternative embodiment of the embossing device

Figure 4a-4b

two alternative embodiments of an angle adjustment

FIG. 1 shows an embossing device with the rotary embossing device 1 according to the invention in partially dismounted state. The rotary embossing device 1 has an upper tool, which is designed as a male part 2 and a lower tool, which is designed as a die 3. The male part 2 consists of a roller body 4, on which a tool sleeve 5 is fixed, which has raised embossing points on its outer shell surface, for the sake of clarity in FIG. 1 are not shown. The die 3 also has a roller body 6, which has corresponding recesses on its outer shell surface, the sake of clarity in FIG. 1 also not shown in detail. The recesses can be introduced either directly on the outer shell surface 7 of the roller body 6 of the die 3, or analogously to the male in a tool sleeve, not shown, which is mounted on the roller body 6 of the die 3. Both the male part 2 and the female part 3 are protected against contact by protective boxes 8, 9. The male part 2 is mounted on a flange, not shown, and is driven by a drive shaft 12. Furthermore, it is guided by an upper tool guide element 10, which is supported on a crossbeam 15, laterally. The die 3 is mounted on a flange, not shown, and is driven by a lower drive shaft 13. Furthermore, it is guided laterally by a lower tool guide element 11, which is supported on a lower transverse beam 16.

On the drive shafts 12, 13 can parallel to the illustrated rotary tools 2, 3 be mounted even more rotary tools. The position of another male 2 'is indicated by a first point, the position of another female 3' by a second point.

The drive shafts 12, 13 are driven by servomotors 14.

By means of such embossing device can be sheet, web or web-shaped substrates with an embossing, in particular a Braille embossing provided by the substrates are moved by a well-known and therefore not shown belt transport system between male and female die 3 3.

FIG. 2 shows a rotary embossing device 1 according to the invention, as shown on a drive shaft 12 (not shown in detail) pushed and fastened by means of a tool guide member 10 on a transverse line 15 (not shown). A roller body 4 is mounted on ball bearings 10.2 of a tool carrier 10.1 and has a polyhedron which is complementary designed to a Außenvielkant the drive shaft 12. Instead of a polygon also polygonal or a shaft with key can be used, the roller body is then also carried out correspondingly complementary , The roller body 4 is thus mounted on the tool carrier 10.1 and is driven by the drive shaft 12. On the roll body 4, a clamping ring 31 is pushed. The clamping ring 31 consists of a plurality of elastomeric rings 32, wherein a spacer ring 33 is disposed between each two elastomeric rings 32. Both elastomer rings 32 and spacers 33 are attached to a joining piece 34 and are held together. The roller body 4 is provided at its one end with an external thread 38, on which a provided with an internal thread 37 clamping cover 36 can be screwed. In the clamping cover 36 engagement points may be provided for a tool for easier rotation of the clamping cover 36, such as holes for a face spanner. By screwing the clamping cover 36 of the clamping ring 31 is secured.

This device serves to receive order-dependent, differently designed tool sleeves 17, which may be provided, for example, with elevations for the generation of Braille points. In the case shown, it is a slotted tool sleeve 17. This tool sleeve 17 may be on the clamping ring 31st be postponed easily. The longitudinal edges of the tool sleeve 17 in the region of its slot engage in specially shaped grooves of the joining piece 34, so that the tool sleeve 17 is fixed on the clamping ring 31. In order to ensure a tight fit of the tool sleeve 17, a tension in the clamping system 30 must be generated. This happens because the clamping cover 36 is further screwed onto the roller body 4. During this screwing movement, the elastomer rings 32 of the clamping ring 31 undergo a pressing or pinching and thereby expand radially. Due to the expansion of the elastomer rings 32, the tool sleeve 17 is clamped and holds in a secure press fit on the roller body 4. The screwing movement s for clamping is in FIG. 2 marked with a double arrow.

If an angle adjustment of the tool sleeve 17 relative to a counter tool, not shown, or relative to another, mounted on the shaft 12 rotary embossing tool 2 (not shown) required, the angle adjustment can be done in a simple manner by operating the adjustment 20. The adjusting device 20 has for this purpose a positioning element 21, which is pin-shaped and can be actuated by an adjusting mechanism 23. The adjusting mechanism 23 has a threaded pin, which has at its one head, for example, an easily accessible from outside the male 2 hexagon socket. By operating the hexagon socket, the grub screw is turned. The positioning element 21 has a matching internal thread and is displaced by the rotation in the axial direction. The adjusting mechanism 23 is integrated into the roller body 4 and only one pin of the positioning element 21 protrudes beyond the offset lateral surface of the roller body 4. This pin of the positioning element 21 engages in a groove 22, which is introduced on the inside of the joining piece 34. The groove 22 (in Fig. 2 indicated by a dashed line) is oriented in the joining piece 34 so that it is aligned at an acute angle to the axial direction. This results in an axial displacement of the positioning element 21 during the actuation of the adjusting mechanism 23, an angular displacement of the joining piece 34 and thus the entire clamping ring 31 and together with the tool sleeve 17. For illustration, the orientation of the groove 22 in FIG. 2 by a dashed line indicated. The resulting adjustment movement j in the circumferential direction of the tool sleeve 17 for angular correction of the tool sleeve 17 is represented by an arrow j.

In FIG. 3 an alternative embodiment of the rotary embossing device 1 is shown for the use of closed tool sleeves 18. The closed tool sleeve 18 has at one of its round edges a recess 19. The joining piece 34, which is connected to the clamping ring 31 and between roller body 4 and clamping ring 31 is inserted , has a recess 35 to the complementary nose 35, wherein the recess 19 of the tool sleeve 18 engages when pushing the tool sleeve 18 on the clamping ring 31 in the nose 35, so that the closed tool sleeve 18 is fixed on the clamping ring 31. The clamping of the tool sleeve 18 is effected as described above by a further unscrewing (s) of the clamping cover 36. The angle adjustment of the tool sleeve 18 can also be done with the aid of an adjusting device 20 as described above by the adjusting device via a groove (indicated by a dashed line) the joining piece 34, so that the clamping ring 31 and thus also the tool sleeve 18 is rotated in the circumferential direction.

In FIG. 4a a first embodiment of the adjusting device 20 is shown. The adjusting device 20 in this case has a worm-helical gear 25, 26. The worm wheel 25 is provided with a hexagon socket, which is easily accessible from the outside through a hole in the joining piece 34. The worm wheel 25 engages in a spur gear 26, which is provided with an external toothing. The external toothing of the spur gear 26 in turn engages in a toothing 27 on the inside of the joining piece 34. Due to the interaction of the worm wheel 25 and the spur gear 26, a very high reduction and thus a very precise adjustment of the position of the joining piece 34 relative to the roller body 4 are made possible.

In FIG. 4b a further embodiment of the adjusting device 20 is shown, which has an eccentric 24. The eccentric 24 is embedded in the roller body 4 and is rotatably supported by means of a pin 28 which engages in a bore in the roller body 4. On its surface, which in FIG. 4b Not can be seen, the eccentric 24 has a hexagon socket, about which a rotational movement of the eccentric disc 24 can be initiated from outside the rotary embossing device 1. The eccentric disc 24 is located in the region of a joining piece 34. The joining piece 34 has been provided on its inside with a groove 39 through which the eccentric disc 24 is received. In the joining piece 34 in the region of the groove 39, a long hole 39.1 is introduced, which in FIG. 4b only hinted at. The slot 39.1 ensures that the hexagon socket (not shown) of the eccentric disc 24 remains accessible to the operator. A rotation of the eccentric disc 24 causes the joining piece 34 is displaced relative to the roller body 4 via the groove 39, whereby an angular adjustment of the clamping ring 31 and thus also a tool sleeve 17, 18 takes place.

LIST OF REFERENCE NUMBERS

1

Rotary embosser

2

Male part (rotary embossing tool)

3

Die (rotary embossing tool)

4

Roll body of the patrix

5

Tool sleeve of the male part

6

Roll body of the die

7

Shell outer surface of the die

8th

upper protection box

9

lower protection box

10

Upper tool guide element
10.1 Tool carrier
10.2 Ball Bearings

11

lower tool guide element

12

upper drive shaft

13

lower drive shaft

14

servomotor

15

upper crossbar

16

lower crossbar

17

slotted tool sleeve

18

closed tool sleeve

19

recess

20

adjustment

21

positioning

22

groove

23

adjustment

24

eccentric

25

worm

26

spur gear

27

gearing

28

spigot

30

clamping system

31

clamping ring

32

elastomer ring

33

spacer

34

joining piece

35

nose

36

clamping cover

37

inner thread

38

external thread

39

Groove in joining piece

39.1

Long hole

s

Screwing movement for clamping

j

Adjusting movement for angle adjustment

Claims (10)

A rotary embossing device (1) for embossing sheet-like materials such as sheets, sheets of paper, cardboard, plastic and composite materials with a drive shaft (12) and at least one stamping tool (2) mounted thereon, wherein the stamping tool comprises a roller body (4), a clamping system (30) and a tool sleeve (17, 18), wherein the tool sleeve (17, 18) with the clamping system (30) on the roller body (4) is stretched,
characterized,
in that the clamping system (30) has at least one clamping ring (31) which is arranged between the roller body (4) and tool sleeve (17, 18) and that the at least one clamping ring (31) is in engagement with an adjusting device (20) for rotation (J) of the at least one clamping ring (31) for adjusting the angle of the tool sleeve (17, 18) about an axis of rotation of the embossing tool (2). Rotary embossing device according to claim 1,
characterized,
in that the adjusting device (20) has an in particular axially displaceable positioning element (21) and an adjusting mechanism (23) mounted in particular within the roller body (4), the clamping ring (31) having on its inner surface a groove (22) and the Positioning element (21) in the groove (22) is displaceable, wherein the displacement causes an adjustment (j) of the clamping ring (31). Rotary embossing device according to claim 1,
characterized,
that the adjusting device (20) has a roller body (4) mounted eccentric (24) whose rotation causes a displacement (j) of the clamping ring (31). Rotary embossing device according to claim 1,
characterized,
in that the adjusting device (20) has a worm-geared helical gear (25, 26) and the clamping ring (31) has a toothing (27) on its inner surface, wherein a rotation of the worm wheel (25) via the spur gear (26) and the toothing (27 ) causes an adjustment (j) of the clamping ring (31). Rotary embossing device (1), in particular according to one of the preceding claims, for embossing sheet-like materials such as sheets, sheets and webs of paper, cardboard, plastic and composite materials with a drive shaft (12) and an embossing tool (2) mounted thereon, wherein the embossing tool ( 2) a roller body (4), a clamping system (30) and a tool sleeve (17, 18), wherein the tool sleeve (17, 18) with the clamping system (30) on the roller body (4) is stretched,
characterized,
that the clamping system (30) has at least one clamping ring (31) positioned between the roll body (4) and the tool sleeve (17, 18) is arranged, wherein the clamping ring (31) has at least one elastomer ring (32) and the clamping system (30) furthermore has an axially displaceable clamping cover (36) for pressing the at least one elastomeric ring (32). Rotary embossing device according to claim 5,
characterized,
that the clamping ring (31) has a plurality of elastomer rings (32) and in each case between two elastomer rings (32) each have a particular rigid spacer ring (33). Rotary embossing device according to claim 5 or 6,
characterized,
in that the roller body (4) has an external thread (38) and the clamping cover (36) has a complementary internal thread (37) for screwing (s) the clamping cover (36) onto the roller body (4). Rotary embossing device according to one of claims 5 to 7,
characterized,
in that an acrylonitrile-butadiene rubber is chosen as the elastomer for the at least one elastomeric ring (32). Rotary embossing device according to one of the preceding claims,
characterized,
that the tool sleeve (18) is tubular with a closed lateral surface. Rotary embossing device according to one of claims 1 to 8,
characterized,
that the tool sleeve (17) is tubular with a slotted lateral surface, and that the clamping ring (31) has a joining piece (34) and the two longitudinal edges of the tool sleeve (17) are connected to the joining piece (34), in particular form-fitting.

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