EP2454059B1 - Flexible rotary cutting die and cutting die cylinder - Google Patents

Description

Technical area

The invention relates to a foil knife for use on the lateral surface of a suction and blowing air function equipped carrier roll of a rotary die, wherein the foil knife has a base plate with a bottom and a top, wherein on the upper side of the base plate at least one cutting edge is arranged and wherein the top the base plate has at least one edge adjacent to cutting, partially or completely surrounded by cutting area in which parts of the sheet to be punched in the prior art can jam during the stamping process in the prior art. The invention also relates to a solid blade roller.

State of the art

Rotary punches are known per se. This stamping technique is widely used in the paper-processing, tissue-processing and film-processing industry, in particular in the production of folding box blanks, banknotes, envelopes, mailers, hygiene articles such as sanitary napkins and labels. A rotary die usually consists of a core rotating about its own axis measuring roll (roller with a cutting assembly) and a counter-cutting element, which is designed as a knife roller, as a counter-cutting roller with smooth roller peripheral surface (roller without cutting arrangement) or as a fixed counter cutting bar. The punching process causes a material separation, either good parts are separated or there is a separation between good parts and waste parts. Good parts are, for example, folding carton blanks, letter blank blanks or labels. Under waste parts are for example skeletons, Fensterschnippel or Restschnippel to understand. at Rotary punches in general there is the problem that the stamped material can jam between cutting. So that the stamped material can be transferred to subsequent transport or processing units, a variety of devices are used to solve the jammed punched parts again. It is known, spring-mounted mechanical ejector, as used for example in the DE 73 05 842 U be described. It is also known to use needles in combination with scrapers, as used for example in the DE 199 36 854 C1 to be discribed. In the DE 26 07 812 A1 the use of blown air and a separating blade, as discharge means or Abschälmittel is described. The US 5,701,789 and the DE 102 48 124 A1 describe the use of foil knives in rotary punches and resilient elements as part of the foil knife or in combination with the foil knife, which releases stamped good parts or waste parts from the foil knife to allow transfer of the stamped parts to subsequent transport or processing units.

Definition of terms: If the term "stamped part" is used below, this includes both "good parts" and "waste parts".

A disadvantage of the known devices is that they do not prevent the jamming of the stamped parts between the cutting edges of the knife roller, but only begin after jamming and require a partially complex and partially disturbing release of the stamped parts. This is explained in more detail at the following US 5,701,789 and the DE 102 48 124 A1 , The material to be punched is first pressed in the punching process in the direction of the cutting edge, thereby overcomes the spring force of the mechanical ejector and jammed between the usually oblique edges of the cutting edge. The tensioned springs release their energy after the punching process and release the jamming. This loosening or ejecting is disturbing if a machine cycle precise transfer of the stamped parts is to take place subsequently or if a long stamped part is to be transferred, as seen in the material direction M. At the then possibly multiple placement of the ejector per stamping and simultaneously high processing speed, there is a fluttering of the punching material. These resilient mechanical ejectors can also lead to unwanted marks on the product.

Another problem with the known devices is their use on carrier rolls with suction and blowing air function. The appropriate positions of the air breakthroughs in the foil knife overlap those of the ejector. At a window snore e.g. should be taken with the suction air, the leading cutting edge (otherwise the leading cut edge at high processing speeds), but also the detachment of the snip from the roll after the punching process, for the purpose of precise over- or passing of the snip, at the leading cutting edge of the Schnippels begin.

The known devices also have the disadvantage that they can no longer be used at very close to each other cutting contour sections or very small closed contours = window contours (eg circular cutting contour with a diameter of 6 mm) either for space and mounting reasons (separate resilient ejector ) or the desired ejection effect can not be achieved.

The placement problem is exacerbated with suction and blower air support rollers because the array density of the suction and blown air ports is limited and thus the foil knife is required to have greater adaptability to the arrangement of air breaches and dispensing means. With an arrangement of the resilient ejector in the immediate vicinity of the suction opening, no reliable suction effect is achieved.

When using a solid blade roller (term Massive blade roller below) is in connection with closely adjacent cutting contour sections or with very small closed contours attaching the known resilient ejector also not conceivable.

From the US-A-6,026,725 For example, a foil knife is known for use on the surface of a carrier roll. The foil knife has a base plate with a bottom side and an upper side, wherein a cutting edge is arranged on the upper side. In addition, the upper side of the base plate has an area surrounded by the cutting edge, in which there is a foil knife breakthrough. Through the foil knife breakthrough a punched flat material is so sucked that it can be held in the area surrounded by the cutting edge and can be transported further by means of the support roller.

From the EP-A-0 401 769 is a solid blade roller is known, which has a cutting edge on its roller peripheral surface. In addition, a region surrounded by a cutting edge is provided on its roller peripheral surface, in which suction openings for sucking a punched flat material are located. As a result, the flat material can be sucked in such a way that it can be held in the area surrounded by the cutting edge and can be transported further by means of the solid blade roller.

The US-A-5,704,264 describes a solid blade roller, are arranged on the roll surface cutting. The areas between the cutting edges are formed increased compared to the areas outside the cutting edges to counteract jamming punched flat pieces of material. The increase is designed either over the entire surface or in the form of elevated trained "beaches" that run continuously along the edges.

Technical task

• Uneingeschränkter Einsatz von Saug- und Blasluft
• Niedriger Blasluftdruck
• Verwendung bei nah nebeneinander liegenden Schneidkonturabschnitten oder bei sehr kleinen geschlossenen Schneidkonturen
• Maschinentaktgenaue Übergabe der Stanzteile
• Ruhiger und schonender Transport des Stanzmaterials

The object of the invention is thus to provide a foil cutter or a solid blade roller which prevents jamming of the stamped parts on the cutting roller and which enables reliable transfer of punched parts to subsequent transport or processing units. The following requirements must be met:

• Unrestricted use of suction and blowing air
• Low blown air pressure
• Use in close-spaced cutting contour sections or with very small closed cutting contours
• Machine cycle exact transfer of the stamped parts
• Quiet and gentle transport of the punching material

Solution of the task

This object is achieved by the features of claim 1 and the independent claim 8. Advantageous embodiments will become apparent from the dependent claims.

According to the invention, the foil cutter in the at least one adjacent to cutting, partially or completely surrounded by the cutting area at least one arranged on top of the base plate elevation, which is arranged, formed and connected to the foil knife, that they jamming of the stamped flat material or portions of the stamped sheet prevented. In this case, the prevention of jamming takes place in that the at least one increase provided according to the invention leads to a curvature or waviness or unevenness of the sucked-in stamped flat material. The increase in the sense of the present invention must therefore always be designed such that a curvature of the stamped flat material in the aforementioned manner can arise.

An advantage of this solution is that the immersion of the punching material is counteracted during the punching process in the direction of the base plate by the increase and jamming of the stamped parts is prevented from the outset. The problem with respect to the task of the invention disturbing ejection of the stamped parts, is no longer necessary. When using blown air to separate the stamped part from the knife roller, it is possible to work with lower pressures, which contributes to reducing the noise emission and the compressed air consumption.

Further advantageous embodiment

In a suitable embodiment, the foil knife is clamped onto the lateral surface of the carrier roller.

In a further suitable embodiment, the foil knife is held by means of magnetic force on the lateral surface of the support roller.

It is also possible that the foil knife is held by clamping force on the lateral surface of the support roller.

Even further, it is possible that the foil knife held by means of positive engagement on the lateral surface of the support roller.

It is also possible that the foil knife is held by adhesive force on the lateral surface of the support roller and it is possible that the foil knife is held by suction on the lateral surface of the support roller.

Of course, a combination of the aforementioned holding principles can be selected for fixing the foil knife.

It is possible to use a carrier roll with suction and blowing air function.

The increase is executed according to the invention as a bridge or pin.

Preferably, additional elevations are carried out as a plateau, as a cutting edge or as a bead. These design variants can also be combined. The advantage here is the flexibility that is necessary for preventing jamming of different stamping part shapes and sizes. Ultimately, the actual shape and progression of the elevations are not fully defined by the concepts introduced above. These terms are intended to convey an idea of the capabilities of the invention.

Increases are advantageous if they contain at least one breakthrough as a suction and / or Blasluftdurchführung. As a result, the unrestricted use of suction and blowing air is possible. The interaction of the flexibility in the positioning of the elevations and the suction and blowing air function, the limited density of the roll pattern and the resulting necessary adaptability of the foil knife is taken into account.

Moreover, it is advantageous if the elevation, viewed from the top view of the foil cutter, is directly connected to a cutting contour. Thus, the jamming of the stamped parts can be counteracted, especially in the actual clamping zones.

Still further, it is advantageous if the increase, viewed from the top view of the film knife, with a plurality of cutting contour sections one or several cutting directly connected. Thus, the jamming of the stamped parts can be counteracted simultaneously in several clamping zones.

Moreover, it is advantageous if the elevation, viewed from the top view of the foil cutter, is placed between or adjacent to cutting contour sections of one or more cutting edges without being directly in contact therewith. The punching material is better managed. This contributes to a smooth transport of the punching material.

Of course, it is also possible to combine the embodiments described in the two preceding paragraphs.

In one possible embodiment, the height h of the increase is smaller than the cutting height H or equal to the cutting height H and the height difference Δh is in a range of 0% to 70% of the cutting height H.

In another possible embodiment, the height h of the increase is smaller than the cutting height H and the height difference Δh is in a range of 10% to 50% of the cutting height H.

A suitable embodiment is the use of the film knife according to the invention in conjunction with a counter-cutting element, which is designed as a counter-cutting roller with a smooth roll surface.

However, it is also suitable to use the foil cutter according to the invention in conjunction with a counter-cutting element which itself is also designed as a knife roller with a cutting arrangement.

Also suitable is the use of the film knife according to the invention in conjunction with a counter-cutting element which is designed as a fixed counter-cutting element (for example counter-cutting strip or knife).

The use of the foil cutter according to the invention with closed cutting contours is particularly advantageous if the area of the area completely surrounded by cutting is less than or equal to 150 mm ² .

In an alternative or additional embodiment, the invention can also be applied to a solid blade roller, wherein the ridges are arranged, formed and connected to the solid blade roller, that they jamming of the punched sheet or portions of the punched Prevent flat material. In solid blade rolling, the blades are arranged on the roller peripheral surface and integrally connected to the roller. Ie they are part of the knife roller.

In a suitable design, the cutting height is a maximum of 3 mm.

In a likewise suitable embodiment, the cutting height is a maximum of 2 mm.

Except that in a solid blade roller, the increase according to the invention is part of the knife roller, possible suction and Blasluftfunktionen are included directly in the knife roller and mounting options for foil knife are not eligible, resulting in the same variants as when using the foil knife described above.

For both the foil knife and the solid knife roller, the elevations are ideally designed in solid construction. That in the film knife, the underside of the elevation (the side facing the carrier roll) forms a continuous surface with the underside of the base plate, and no cavity exists between the bottom of the elevation and the top of the elevation (the side facing the blank). Exceptions are the air breakthroughs. The increase is supported against the support roller. Even with the solid blade roller exists between the increase or the top of the elevation and the knife roller no cavity. Exceptions are the air breakthroughs.

It is also particularly advantageous if the increase is part of the foil cutter, or if using a solid blade roller, is part of the solid blade roller. That There is a composite of material between increase and foil knife or between increase and Massivmesserwalze.

Ideally, elevation and foil knife or elevation and solid blade are made of a material.

In general, for all embodiments: Cutting edge height H is the height of the actual cutting edge. FIG. 5 clarifies this. The lower, that is closer to the base plate or the knife roller dimensional reference of the height h of the increase is in each case on the same plane (viewing the unwound foil knife or the unwound shell of the knife roller) as the lower Maßbezug the cutting height H. This level may coincide with the top of the base plate of the foil knife or the roller peripheral surface of the knife roller or parallel with a distance to the top of the base plate of the foil knife or the roller peripheral surface of the knife roller stand.

embodiments

• Fig. 1 einen Draufsichtausschnitt einer Ausführungsform des erfindungsgemäßen Folienmessers in abgewickeltem Zustand und eine zugehörige Schnittdarstellung
• Fig. 2 einen Draufsichtausschnitt einer weiteren Ausführungsform des erfindungsgemäßen Folienmessers in abgewickeltem Zustand und eine zugehörige Schnittdarstellung
• Fig. 3 einen Draufsichtausschnitt einer weiteren Ausführungsform des erfindungsgemäßen Folienmessers in abgewickeltem Zustand und eine zugehörige Schnittdarstellung
• Fig. 4 eine schematische Darstellung einer Rotationsstanze
• Fig. 5 einen Draufsichtausschnitt einer abgewickelten Walzenumfangsfläche der Massivmesserwalze

The invention will be explained in more detail below with reference to several exemplary embodiments. In the accompanying drawing shows

• Fig. 1 a top plan view of an embodiment of the film knife according to the invention in the unwound state and an associated sectional view
• Fig. 2 a top view of a further embodiment of the foil knife according to the invention in unwound state and an associated sectional view
• Fig. 3 a top view of a further embodiment of the foil knife according to the invention in unwound state and an associated sectional view
• Fig. 4 a schematic representation of a rotary die
• Fig. 5 a plan view detail of a developed roller peripheral surface of the solid blade roller

In the following description of the figures, various embodiments of the foil cutter according to the invention will be described. For reasons of simplicity, elements which correspond in their function are provided with the same reference symbols in the individual figures.

FIG. 1 shows together with FIG. 4 a first embodiment of a rotary die 1 with a foil cutter according to the invention 2. The foil knife 2 rests on the support roller, but is shown unwound together with the support roller surface. The associated sectional view shows only the foil knife 2. The support roller is in this example, a tension roller with suction and blowing air function. Together with the clamped foil knife 2, it forms the knife roller 10. With the help of this knife roller windows are punched in accordance with the cutting contour 3 in the rotary punching process from the sheet 9. The Counter cutting element 11 is in this case a fixed counter cutting strip. By means of the aperture 5, a connection between the suction and Blasluftöffnungen 6 of the support roller and the punching material 9 is produced. After the punching process, the stamped part 9 *, which in this case is a so-called. Fensterschnippel sucked by vacuum and transported on the circumference of the knife roller to the transfer point of Schnippelabsaugung 12. There takes place the separation of the Fensterschnippels 9 'of the knife roller 10 by switching the suction air to blown air. The elevations 4 ensure that the stamped part is not completely sucked into the cutting edge mold 3. It prevents jamming of the stamped part 9 'between the cutting and allows easy transfer. In this embodiment, the cutting height H is 0.7 mm and the height of the increase h is 0.6 mm. The thickness of the base plate is 0.1 mm. Of course, the above-mentioned functionalities can also be achieved with deviating dimensions. By changing the height h, the separation behavior can be controlled (applies to all embodiments). The elevations 4 are, viewed from the top view, directly with the cutting edge contour 3 in connection and run from there web-like in the region of the punched part to be detached. This type of elevations is particularly suitable for closely spaced cutting contour sections and for small closed cutting contours (windows). The arrangement and number of increases 4 is suitably adapted to the sectional shape, A larger area covering the suction and Blasluftöffnungen 6 is avoided.

FIG. 2 shows together with FIG. 4 a second embodiment of a rotary die 1 with a foil cutter according to the invention 2. The difference from the first embodiment lies in the design of the elevations 4 '. They are available here in pin design. The elevations 4 'ensure that the stamped punched part undergoes a curvature and thereby does not jam between the cutting edges 3. A trouble-free transfer of the stamped part 9 'is possible. There are the same height ratios as in the first embodiment. The elevations 4 'are, viewed from the top view, not directly with the cutting contour 3 in combination. The apertures 8 (holes with D = 1mm) in the ridges 4 'can be used as additional punched part suction openings or punched part blow-off openings Arrangement and number of increases 4 'is suitably adapted to the sectional shape. This embodiment is also suitable for closely spaced cutting contour sections and for small closed cutting contours.

FIG. 3 shows together with FIG. 4 a third embodiment of a rotary die 1 with a foil cutter according to the invention 2. The following differences exist to the first two embodiments: The counter-cutting element 11 is a rotating knife roller. The stamped part 9 ', in which the elevation 4 "according to the invention is used, is in this case a so-called" residual grid. "The transfer of the stamped parts 9' to other machine devices takes place according to a principle which will not be described in detail here in bridge version before. The elevations 4 "on the one hand ensure that the stamped part 9 'is not completely sucked into the cutting edge mold 3. It prevents jamming of the stamped part 9' between the cutting edges and allows a problem-free transfer, and on the other hand the elevations 4" are arranged that they lead the skeleton. In this embodiment, the cutting height H is 0.6 mm and the height of the increase h is 0.3 mm. The arrangement and number of elevations 4 "is suitably adapted to the sectional shape.

FIG. 5 shows together with FIG. 4 an alternative embodiment of the rotary die 1 in which, instead of a foil knife 2, a solid blade roller 10 'is used. The cutting height of the solid blade roller 10 'is 2.5 mm, and the height of the elevations 4, 4', 4 "is 2.4 mm, and the roller t0 'is provided with a suction and blowing air function in FIG. 1 is shown.

LIST OF REFERENCE NUMBERS

1

rotary die

2

foil cutter

3

contour cutting

3 '

Cutting contour section

4, 4 ', 4 "

increase

5

Foil knife breakthrough (crosshatching)

6

Suction and blowing air openings of the support roller

7

Clamping zone (hatching)

8th

breakthrough

9, 9 '

Punching material, stamped part

10

Knife roller (support roller + foil knife)

10 '

Knife roller (solid knife)

11

Against cutting element

12

Schnippeltrichter

13

baseplate

14

Top of the base plate

15

Bottom of the base plate

16

Roller circumferential surface

D

Air passage bore diameter

H

cutting height

H

Amount of increase

.delta.h

Difference height (Δh = H - h)

Claims (15)

1. Film cutter (2) for use on the lateral face of a support roller of a rotary punch (1), the film cutter comprising a base plate (13) that has an underside (15) and a top side (14), at least one blade (3) being arranged on the top side (14) of the base plate (13), and the top side (14) of the base plate (13) comprising at least one region (7) that adjoins blades (3) and is partially or completely surrounded by blades, in which region at least one film cutter opening (5) is located, through which at least a part of the punched sheet material (9') can be drawn in such that said part can be retained in the region (7) and transported onwards by means of the support roller,
   characterised in that
   the film cutter (2) comprises, in the at least one region (7) that adjoins blades (3) and is partially or completely surrounded by the blades (3), at least one raised part (4, 4', 4") that is arranged on the top side (14) of the base plate (13) and is designed as a ridge that has a narrow side, by means of which said ridge is directly connected to the blade (3) and extends from there into the surrounding region (7) in a ridge shape, and/or is designed as a pin, and is arranged, designed and connected to the film cutter (2) such that it prevents the part of the punched sheet material (9'), or portions of the punched sheet material (9'), from becoming jammed.
2. Film cutter (2) according to claim 1, characterised in that at least one further raised part (4, 4', 4") is designed as a plateau and/or a blade and/or a bead.
3. Film cutter (2) according to either claim 1 or claim 2, characterised in that the raised part (4, 4', 4") contains at least one opening (8) as a passage for suction air and/or blast air.
4. Film cutter (2) according to any of the preceding claims, characterised in that, when seen in the plan view of the film cutter (2), the raised part (4, 4', 4") is located between or adjacent to blade contour portions (3') of one or more blades (3), without being in direct contact therewith.
5. Film cutter (2) according to any of the preceding claims, characterised in that the height h of the raised part (4) is smaller than the blade height H or equal to the blade height H, and in that the height difference Δh is from 0% to 100% of the blade height H.
6. Film cutter (2) according to claim 5, characterised in that the height h of the raised part (4) is smaller than the blade height H, and in that the height difference Δh is from 10% to 40% of the blade height H.
7. Film cutter (2) according to any of the preceding claims, characterised in that the surface area of the region (17) that is completely surrounded by blades is smaller than or equal to 150 mm².
8. Solid cutter roller (10') for a rotary punch, at least one blade (3) being arranged on the peripheral surface (16) of the roller, and the peripheral surface (16) of the roller comprising at least one region (7) that adjoins blades (3) and is partially or completely surrounded by blades, in which region suction openings (6) are located for drawing in at least a part of the punched sheet material (9'), which part can therefore be drawn in such that it can be retained in the region (7) and transported onwards by means of the solid cutter roller (10'),
   characterised in that
   the solid cutter roller (10') comprises, in the at least one region (7) that adjoins blades (3) and is partially or completely surrounded by the blades (3), at least one raised part (4, 4', 4") which is arranged on the peripheral surface (16) of the roller and is designed as a ridge that has a narrow side, by means of which said ridge is directly connected to the blade (3) and extends from there into the surrounding region (7) in a ridge shape, and/or is designed as a pin, and is arranged, designed and connected to the cutter roller (10') such that it prevents the part of the punched sheet material (9'), or portions of the punched sheet material (9'), from becoming jammed.
9. Solid cutter roller (10') according to claim 8, characterised in that the cutter roller (10') is a roller that has a suction air function and a blast air function.
10. Solid cutter roller (10') according to either claim 8 or claim 9, characterised in that at least one further raised part (4, 4', 4") is designed as a plateau and/or a blade and/or a bead.
11. Solid cutter roller (10') according to any of claims 8-10, characterised in that the raised part (4, 4', 4") contains at least one opening (8) as a passage for suction air and/or blast air.
12. Solid cutter roller (10') according to any of claims 8-11, characterised in that, when seen in the plan view of the roller surface (16) in an unwound state, together with the elements arranged thereon, the raised part (4, 4', 4") is located between or adjacent to blade contour portions (3') of one or more blades (3), without being in direct contact therewith.
13. Solid cutter roller (10') according to any of claims 8-12, characterised in that the height h of the raised part is from 30% to 100% of the blade height H.
14. Solid cutter roller (10') according to claim 13, characterised in that the height h of the raised part is from 60% to 90% of the blade height H.
15. Solid cutter roller (10') according to any of claims 8-14, characterised in that the surface area of the region (17) that is completely surrounded by blades is smaller than or equal to 150 mm².

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