EP3546161A1 - Cutting post post for mounting on a cutter device and cutter device comprising the same cutting post - Google Patents

Abstract

The invention relates to a cutting post for mounting on a cutting device and to a cutting device with at least one cutting blade (4) and with at least one cutting post (2). The cutting post (2) comprises at least one receptacle (11) for a cutting knife (4) and at least one cutting element (12) arranged at the head end (8) with a cutting edge (13). The at least one cutting blade (4) has a cutting blade edge (15) and is held in the receptacle (2) of the at least one cutting post (2). The cutting blade edge (15) of the cutting blade (4) and the cutting blade edge (13) of the cutting element (12) of the cutting post (2) form a continuous cutting contour (16).

Description

The invention relates to a cutting post for mounting on a cutting device and a cutting device with at least one cutting blade and with at least one such cutting post.

For the production of product packaging, packaging machines are used to shape the packaging from plastic films in several process steps, to fill it with a product and, if appropriate, subsequently to seal it. In one of the last process steps of such a production process, the packages are usually cut out of a large film section. For this purpose, cutting devices are provided in the packaging machines.

Such cutting devices have a cutting contour which specifies the geometry and size of the product packaging to be cut out. Especially with more complex or even angular cutting contours, an arrangement of several cutting blades is necessary in order to map the cutting contour can. In the arrangement of the cutting blade to each other form gaps due to usual manufacturing tolerances between the cutting blades. The interruptions in the cutting contour mean that the packages are not cut at the points of impact of the cutting blades, in particular at the corner regions of the cutting contour. The disadvantage is formed at the non-cut points unwanted threads. Possibly even tear out the packaging in the appropriate places. Such defects on the packaging lead to a high production waste and thus cause high costs in production.

Although cutting devices are known in which the cutting blades are welded together to avoid the disadvantages mentioned. However, the production of a welded cutting contour is very complicated and expensive. Another disadvantage is the maintenance of such a cutting device. If only one cutting blade is defective, however, all welded together cutting blades must be replaced.

The invention has for its object to provide a cutting device, which allows easy assembly of cutting knives at the same time precise cutout of packaging.

This object is achieved by a cutting post with the features of claim 1.

The invention is also based on the object to provide a cutting device that allows easy assembly of cutting knives at the same time precise cutout of packaging.

This object is achieved by a cutting device with the features of claim 8.

The cutting post according to the invention for mounting on a cutting device comprises at least one receptacle for a cutting blade and at least one cutting element arranged at its head end with a cutting edge. The cutting post is in addition to at least one cutting blade part of the cutting device according to the invention. The at least one cutting blade has a cutting blade edge and is held in the receptacle of the at least one cutting post. The cutting blade edge of the cutting blade and the cutting edge of the cutting element of the cutting post form a continuous cutting contour.

By means of the reception of the cutting post, the cutting blade can be arranged and held in a predefined position relative to the cutting post.

The cutting post and the cutting blade are arranged to each other so that the cutting edge of the cutting blade with the cutting edge of the cutting element of the cutting post form a continuous cutting contour. Gaps in the cutting contour, in particular between the cutting post and the cutting blade can be avoided. As a result, packages along the entire cutting contour of the cutting device can be completely separated. Uncut portions along the packaging outline that result in the formation of a thread or even tearing of the packaging edges can be avoided. In addition, crossing points and nodal points of a cutting contour can be realized without gaps. The cutting posts and blades are individually interchangeable, which greatly simplifies geometric adjustments, maintenance and repairs.

By provided on the cutting post recording the cutting blade can be easily positioned on the cutting post. In a comparatively simple manner, a continuous cutting contour can be formed during assembly of cutting posts and cutting blades on the cutting device.

The receptacle for the cutting blade is preferably formed as a groove on a peripheral side of the cutting post, which extends in the direction of the longitudinal axis of the cutting post. Through the groove in the cutting post, the cutting post can be pushed during assembly on the cutting blade in the longitudinal direction of the cutting post. In this case, the cutting blade protrudes into the groove of the cutting post. The cutting blade is thus fixed positively in the groove. The cutting post supports this in the groove mounted cutting blade against shear forces that may occur during the cutting process, for example. In addition, the groove of the cutting post allows the juxtaposition of cutting blade and cutting posts, whereby a comparatively low installation costs can be ensured.

The cutting post preferably has several and in particular three or four receptacles for one cutting blade each. Advantageously, the cutting post also comprises at its head end the respective recordings associated cutting elements, each with a cutting edge. If a plurality of cutting blades and a plurality of cutting posts are connected to one another, the cutting posts preferably form the nodal points of the formed cutting contours. The arrangement of a plurality of cutting posts and cutting blade different cutting contours can be formed, which can be configured in different geometries and sizes. If, for example, four equidistantly spaced receptacles for cutting blades are provided on cutting posts, square and / or rectangular cutting contours can be formed. For example, if only three shots are provided, then the cutting blades can be arranged in a honeycomb structure to each other. Since the cutting posts connect as nodes the cutting blade edges of the various cutting blades by means of the cutting edges of the cutting posts to a continuous cutting contour, even with such complex structures a precise cutout of packaging can be ensured.

At the head end of the cutting post, a cutting tip tapering in the direction from the foot end to the head end is preferably formed. The cutting tip is preferably formed by the cutting edge of the at least one cutting element. The cutting edge runs out in the cutting tip. The cutting edge of the at least one cutting element preferably includes an angle with a straight line that runs parallel to the longitudinal axis of the cutting post. This angle is open towards the foot of the cutting post and is smaller than 90 °, in particular smaller than 60 ° and in particular about 45 °.

Consequently, the packaging film is contacted during the cutting process first by the cutting tip and only then followed by the remaining cutting contour. As a result, the packaging film is first pierced by the cutting tip and cut out from there along the cutting contour. By piercing the film, the packaging can be cut out even at low cutting forces, so that the packaging film neither warps nor overstretched.

It is advantageously provided that the at least one cutting element of the cutting post projecting beyond the receptacle for the cutting blade, starting from the longitudinal axis of the cutting post in the radial direction. If the knife is held in the receptacle of the cutting post, the cutting element of the at least one cutting post and the cutting blade overlap. When assembled, the cutting post and the cutting blade contact each other in the overlap. On the one hand, the overlap acts as a positive hold-down for the cutting blade, so that the cutting post and the cutting blade are precisely positioned in the longitudinal direction of the cutting post to each other. On the other hand, this ensures a seamless transition between the cutting edge of the cutting post and the cutting blade edge of the cutting blade. Thus, the overlap between the cutting post and cutting blade of the fixation of the cutting blade in the longitudinal direction while forming a continuous cutting contour.

Another component of the cutting device is advantageously at least one corner post. The corner post has at least one groove for receiving a cutting blade, but no associated cutting element. Such corner posts can in particular record and support cutting blades, which are provided as edge elements. At such edge regions a continuation of the cutting contour is not necessary. Therefore, it is sufficient to provide the comparatively inexpensive corner posts without cutting elements.

The cutting device preferably comprises a base plate, wherein a plurality of cutting blades and a plurality of cutting posts are fastened modularly releasably and replaceably on the base plate. Due to the modular design of the cutting contour of cutting blades and cutting posts individual cutting contours can be created from the same basic elements and possibly also changed. If a cutting knife or a cutting post to maintain or even defective, it is sufficient to replace only the affected element of the cutting device against an intact element. A change of the entire cutting device is not necessary. In addition, for example, after a decommissioning of a cutting device whose cutting blade and cutting posts are reused in another cutting device.

Fig. 1

in einer perspektivischen Darstellung eine erfindungsgemäße Schneidvorrichtung mit Schneidmessern und mit Schneidpfosten,

Fig. 2

in einer perspektivischen Darstellung einen erfindungsgemäßen Schneidpfosten nach Fig. 1 mit Einzelheiten zu dessen geometrischer Ausgestaltung,

Fig. 3

in einer perspektivischen Darstellung von unten den Schneidpfosten nach Fig. 2,

Fig. 4

in einer perspektivischen Darstellung eine als Eckpfosten ausgeführte Variante des Schneidpfostens nach den vorhergehenden Figuren, jedoch ohne Schneidkanten,

Fig. 5

in einer perspektivischen, schematischen Schnittdarstellung die Schneidvorrichtung nach Fig. 1 vor dem Kontakt mit der zu schneidenden Folie,

Fig. 6

die Anordnung nach Fig. 5 mit in die Folie eingestochenen Schneidspitzen der Schneidpfosten,

Fig. 7

die Anordnung nach den Fig. 5, 6 mit weiter abgesenkten, die Folie durchtrennenden Schneidmessern,

Fig. 8

in einer perspektivischen Darstellung eine Ausführungsvariante der Anordnung nach den Fig. 1 bis 7 mit einer Schneidkontur in einer mehrfachen Rechteckstruktur,

Fig. 9

in einer perspektivischen Darstellung eine weitere Ausführungsvariante mit einer Schneidkontur in einer Wabenstruktur und mit Eckpfosten nach Fig. 4.

Embodiments of the invention are explained below with reference to the drawing. Show it:

Fig. 1

in a perspective view of a cutting device according to the invention with cutting blades and with cutting posts,

Fig. 2

in a perspective view of a cutting post according to the invention Fig. 1 with details of its geometric configuration,

Fig. 3

in a perspective view from below the cutting post after Fig. 2 .

Fig. 4

in a perspective view of a running as a corner post variant of the cutting post according to the preceding figures, but without cutting edges,

Fig. 5

in a perspective, schematic sectional view of the cutting device according to Fig. 1 before contact with the film to be cut,

Fig. 6

the arrangement after Fig. 5 with cutting tips of the cutting posts pierced in the film,

Fig. 7

the arrangement after the Fig. 5, 6 with further lowered, the foil by cutting cutting blades,

Fig. 8

in a perspective view of an embodiment of the arrangement according to the Fig. 1 to 7 with a cutting contour in a multiple rectangular structure,

Fig. 9

in a perspective view of a further embodiment variant with a cutting contour in a honeycomb structure and with corner posts after Fig. 4 ,

Fig. 1 shows a cutting device according to the invention executed in a perspective view. The cutting device 1 is part of a packaging machine, not shown, and serves herein to cut out packages. Such packages are made of plastic film, which is usually provided in the form of film webs. The plastic film is deep-drawn in the packaging machine, for example via a deep-drawing process by means of vacuum in a corresponding packaging form, for example in a bag shape. Thereafter, the packaging form is filled with the product to be packaged and sealed with a second plastic film. With the aid of the cutting device 1, one of the last method steps is carried out, namely the removal of the filled packaging from the film web. Particularly suitable as packaging materials are water-soluble plastics such as polyvinyl alcohol (PVOH), but also water-insoluble plastics can be used to produce such packages. The packages can be used, for example, for detergents or detergents both in powdery and in detergent be used in liquid form. Such packages are also suitable for use in the pharmaceutical sector for the packaging of medicines.

The cutting device 1 has an upper part 23 and a lower part 24. In the in Fig. 1 In the embodiment shown, the upper part 23 comprises four cutting posts 2 and four cutting blades 4. The cutting posts 2 and the cutting blades 4 are mounted on a base plate, not shown. At the cutting posts 2 receptacles 11 are formed, on which the cutting blade 4 are held positively. At the cutting blades 4 each have a cutting blade edge 15 is formed. The cutting posts 2 comprise cutting elements 12, on each of which a cutting edge 13 is formed ( Fig. 5 ). The cutting edges 13 of the cutting posts 2 and the cutting blade edges 15 of the cutting blade 4 form a continuous cutting contour 16. In the embodiment according to FIG. 1 the cutting blades 4 and the cutting posts 2 are alternately arranged such that the cutting contour 16 has a rectangular shape.

The lower part 24 comprises a mold plate 17, which has a trough 18. The trough 18 serves to form the packaging in one of the upstream process steps of the packaging installation. A corresponding packaging is in Fig. 1 shown schematically as a packaging film 5. In the mold plate 17 cutting slots 19 are formed, which are arranged in a rectangle around the trough 18 extending and corresponding to the rectangular shape of the cutting contour 16.

To cut the packaging film 5 according to the cutting contour 16 of the upper part 23, lower part 24 and upper part 23 are moved together. In the process, the upper part 23 with its cutting contour 16 dips into the cutting slots 19 of the lower part 24 and cuts through the packaging film 5. If the packaging film 5 is cut, upper part 23 and lower part 24 are moved apart again. The cutting posts 2 and the cutting blades 4 are pulled out of the cutting slots 19 of the base 24.

In the FIGS. 2 and 3 is the inventively designed cutting post 2 from Fig. 1 shown. The cutting post 2 extends along its longitudinal axis 7 from its foot 9 to its head end 8.

The cutting post 2 has a first portion 25 and a second portion 26. The cutting post 2 is formed along the first portion 25, which extends from the root 9 to the second portion 26, as a substantially cylindrical body of revolution. Along the second section 26, which extends from the first section 25 to the head end 8, the cutting post 2 is formed of four plate-shaped cutting elements 12, each having a cutting edge 13. The cutting elements 12 are arranged to each other such that their cutting edges 13 converge in the longitudinal axis 7 together.

The cutting edges 13 of the cutting elements 12 are inclined relative to the longitudinal axis 7 and run together in a cutting tip 14. The cutting edges 13 close with the longitudinal axis 7 of the cutting post 2 an angle α, which is open towards the foot end 9 of the cutting post 2. The angle α is less than 90 °, in particular less than 60 °, in the preferred embodiment, approximately 45 °.

As in the FIGS. 2 and 3 shown, the cutting post 2 on a peripheral side 10, on which four receptacles 11 are formed for mounting the cutting blade 4. In the preferred embodiment, the receptacles 11 are formed as grooves which extend in the direction of the longitudinal axis 7. In this case, the grooves extend from the foot end 9 of the cutting post 2 up to the cutting element 12. The groove is bounded by a first support surface 21 which is formed on the foot end 9 facing side of the cutting element 12. When mounting the cutting post 2 on the cutting blade 4, the cutting post 2 can be pushed at its groove on the cutting blade 4 until the cutting post 2 comes with its first bearing surface 21 on the cutting blade 4 to the plant. The first bearing surface 21 thus forms a vertical stop between the cutting post 2 and the cutting blade 4 in Direction of the longitudinal axis 7. In addition, a second support surface 22 is formed on the cutting element, which serves starting from the longitudinal axis 7 in the radial direction as a horizontal stop between the cutting post 2 and the cutting blade 4.

The four receptacles 11 are arranged in the circumferential direction of the cutting post 2 at equal angular intervals. Thus, the angular distance β between the respective adjacent receptacles 11 in the FIGS. 2 and 3 shown cutting posts 90 °. The cutting elements 12 are aligned at the same angular intervals as the receptacles 11, so that in each case adjacent cutting elements 12 with the cutting edges 13 to each other the angular distance β in the amount of 90 °.

As a result, the cutting posts 2 in arrangement with the cutting blades 4 mounted on the base plate form a rectangular structure. In an alternative embodiment of the cutting device 1, not shown, the angular spacing β of adjacent receptacles 11 and adjacent cutting elements 12 may be different from one another. As a result, for example, diamond or Parallelogrammformen or other structures can be created.

In Fig. 4 a corner post 3 is shown. The corner post 3 has a receptacle 11, which is formed in the embodiment as a groove. The groove extends as in the cutting post 2 along the longitudinal axis 7 'of the Eckpfostens 3. In this case, the groove extends from the foot end 9 of the Eckpfostens up to a first bearing surface 21, which is formed at the head end 8 of the Eckpfostens 3. Like the cutting post 2, the corner post can be slid onto the cutting blade 4 for mounting with its groove 11 until it comes into contact with the first bearing surface 21 '. The corner posts have no cutting elements 12. The corner posts 3 serve only as support of the cutting blade 4, which are arranged at edge regions of a cutting pattern.

In the FIGS. 5 to 7 are schematic sectional views of the cutting device according to Fig. 1 shown, which illustrate the cutting process in step images. In Fig. 5 The upper part 23 and the lower part 24 are still in the starting position. Already in Fig. 6 Upper part 23 and lower part 24 are moved together so far that the cutting tips 14 pierce the packaging film 5. The cutting post 2 dives with its second portion 26, namely with its cutting elements 12 in the cutting slots 19 a. The packaging film 5 is then cut by the cutting edges 13. The cutting blade edges 15 of the cutting elements 4 do not yet protrude into the cutting slots 19. Only in Fig. 7 are the upper part 25 and the lower part 26 completely moved together. The cutting blades 4 are immersed in the cutting slots 19, and the packaging film 5 is cut out. Subsequently, the upper part 23 and the lower part 24 are moved apart again.

In the embodiment according to the cutting device according to Fig. 1 the cutting blade edges 15 on a corrugation or a serrated edge, which extends exclusively in the plane of the respective cutting blade, that has no waveform transverse thereto. As a result, the cutting forces on the packaging film 5 can be reduced so that stretching or distortion of the packaging film 5 is avoided. At the same time, the cutting lines and thus the outlines of the cut-out packaging are rectilinear.

In Fig. 8 is an arrangement of a plurality of cutting posts 2 and a plurality of cutting blades 4 as a variant of the arrangement according to Fig. 1 shown with multiply repeated rectangular sectional contour 16. The cutting posts 2 in accordance with the Fig. 2, 3rd in each case four receptacles 11 and four cutting elements 12. The mutually adjacent receptacles 11 and the mutually adjacent cutting elements 12 each have an angular distance β of 90 °. This requires a square, at least rectangular arrangement of the cutting posts 2 and 4 of the cutting blade.

In Fig. 9 a further embodiment of an arrangement of a plurality of cutting posts 2 and a plurality of cutting blades 4 is shown, in which case also several corner posts 3 are used in addition. The cutting posts 2 here each have three receptacles 11 and three cutting elements 12. The mutually adjacent receptacles 11 and the mutually adjacent cutting elements 12 each have an angular distance β of 120 °. This results in a honeycomb arrangement of the cutting posts 2 and the cutting blade 4 and a corresponding honeycomb pattern. At the edge regions of the arrangement, the cutting blades 4 are held on corner posts 3.

The patterns after the FIGS. 8 and 9 can be expanded as desired by the addition of additional cutting blade 4, 2 cutting posts and corner posts 3 like a box or even reduced. The cutting posts 2 serve as connecting elements of the cutting blade 4. In addition to the embodiment according to Fig. 2 Here, the cutting posts not only function as a corner post, but also the function as node or crossing points for the individual cutting lines. In this case, the cutting posts 2 ensure by the connection of several cutting blade edges 15 with each other via the cutting edges 13 of the cutting elements 12 a everywhere continuous, gap-free cutting contour 16th

Claims (13)

Cutting post for mounting on a cutting device,
the cutting post (2) extending along a longitudinal axis (7) and comprising a head end (8) and a foot end (9), the cutting post (2) comprising at least one receptacle (11) for a cutting knife (4) and at least one Head end (8) arranged cutting element (12) having a cutting edge (13). A cutting post according to claim 1,
characterized in that the receptacle (11) for the cutting blade is formed as a groove on a peripheral side (10) of the cutting post (2) which extends in the direction of the longitudinal axis (7) of the cutting post (2). A cutting post according to claim 1 or 2,
characterized in that the cutting post (2) comprises a plurality and in particular three or four receptacles (11) for each one cutting blade (4), and that the cutting post (2) also at its head end (8) the respective receptacles (11) associated cutting elements (12), each with a cutting edge (13). A cutting post according to any one of claims 1 to 3,
characterized in that at the head end (8) of the cutting post (2) in the direction from the foot end (9) to the head end (8) tapered cutting tip (14) is formed. A cutting post according to claim 4,
characterized in that the cutting edge (13) of the at least one cutting element (12) terminates in the cutting tip (14). A cutting post according to any one of claims 1 to 5,
characterized in that the cutting edge (13) of the at least one cutting element (12) encloses an angle (α) with a straight line parallel to the longitudinal axis (7) of the cutting post (2), the angle (α) to the root end ( 9) of the cutting post (2) is open, and wherein the angle (α) is less than 90 °, in particular less than 60 °, and in particular about 45 °. A cutting post according to any one of claims 1 to 6,
characterized in that the at least one cutting element (12), the receptacle (11) for the cutting blade (4), starting from the longitudinal axis (7) of the cutting post (2) projects beyond in the radial direction. Cutting device comprising at least one cutting knife (4) and at least one cutting post (2) according to one of claims 1 to 7, wherein the at least one cutting knife (4) has a cutting knife edge (15) and in the receptacle (2) of the at least one cutting post ( 2), wherein the cutting blade edge (15) of the cutting blade (4) and the cutting blade edge (13) of the cutting element (12) of the cutting post (2) form a continuous cutting contour (16). Cutting device according to claim 8,
characterized in that the receptacle (11) is formed as a groove, and that the at least one cutting blade (4) projects into the groove of the at least one cutting post (2). Cutting device according to claim 8 or 9,
characterized in that the cutting element (12) of the at least one cutting post (2) and the cutting blade (4) overlap. Cutting device according to one of claims 8 to 10,
characterized in that the cutting device (1) comprises at least one corner post (3), wherein the corner post (3) has at least one groove (11) for receiving a cutting blade (4) and no associated cutting element (12). Cutting device according to one of claims 8 to 11,
characterized in that a plurality of cutting blades (4) and a plurality of cutting posts (2) are interconnected such that the cutting posts (2) form nodes of cutting contours (16). Cutting device according to one of claims 8 to 12,
characterized in that the cutting device (1) comprises a base plate, wherein a plurality of cutting blades (4) and a plurality of cutting posts (2) are removably mounted on the base plate detachably and exchangeably.

Images