Cutter for cutting bottle caps

Abstract

A tool (100; 100 ') configured to be fitted to a cutting device to obtain a cut line and a cut on a cap (7) made of plastic intended to close a container, and adapted to move along a path on the cap (7) in an advancing direction (T) by rotation about an axis of rotation (R) to cooperate with the cutter (100; 100 '), the cutter (100; 100') interacting with each other on a side wall (70) of the cap (7), the cutter (100; 100 ') comprises a plurality of cutting tools arranged in a layered structure, wherein the cutting tools are stacked parallel to a plane (P) and in the direction of a vertical axis (Z) orthogonal to the plane (P).

Description

[0001] This application is a divisional application of the invention patent application with the application date of March 19, 2021, the priority date of March 19, 2020, the application number 202180005838.8, and the invention name being a knife for cutting bottle caps. Technical Field

[0002] The invention relates to a tool for cutting bottle caps or closures or caps made of plastic of the type used to close containers such as bottles. In particular, the invention relates to a tool configured to cut the side wall of the bottle cap in order to obtain on this side wall a tamper-evident strip or ring and one or more connecting parts, also called legs or hinges, which connect the tamper-evident strip or ring to different parts of the bottle cap, for example to the skirt, that is, the part of the side wall having the closed end of the bottle cap. Background Art

[0003] The design of objects made of plastic is increasingly moving towards the choice of recyclable materials and the recovery of the object after its use. Therefore, even in the container closure industry, there is an increasing demand for closures with a bar that allows the closure to be held on its tamper-evident ring even after the container has been opened.

[0004] In use, when the bottle cap provided with the tamper-evident strip and the prong is applied to the mouth of a container such as a bottle to close the container, the tamper-evident strip is positioned in a seat generally defined between two annular protrusions provided by the body of the container, which limit the axial movement of the tamper-evident ring. After unscrewing the closure, opening the container, and even after the closed end portion of the closure has moved away from the mouth of the container, the tamper-evident strip remains retained in its seat and the prong remains engaged to the tamper-evident ring and thus to the bottle cap of the bottle.

[0005] Under the condition that the tamper-evident ring can be separated from the bottle together with the closure at the same time, that is, when people want to recycle the plastic material of the closure, this allows effective recycling of plastics. In addition, even after opening the container, keeping the closure connected to the tamper-evident ring still helps prevent the bottle cap from being scattered into the environment.

[0006] The prongs on the side walls of the caps are obtained mainly according to two types of machining operations: by forming, that is to say by providing a mould suitably shaped to form the prongs, or by cutting, that is to say by providing an arrangement of cuts and notches on the side walls of the previously formed caps. The cuts and notches determine the portions of the side walls that can be partially detached from the rest of the side walls of the caps, these portions of the side walls also defining the connecting portions or prongs, in addition to the anti-tampering ring. Techniques are also known for producing prongs that combine a specific shape of the mould used to form the caps with a given shape of the notches obtained on the caps after forming.

[0007] Cutting devices comprising a knife are known which are suitable for cutting or slicing the cap in the side wall of the cap in order to determine a circumferential line for weakening and preferential separation between the tamper-evident strip and the rest of the side wall (i.e. the skirt) of the cap. This type of cutting is known under the name of horizontal cutting.

[0008] Also known are cutting devices suitable for cutting and severing the side wall of the cap in one or more points or areas according to a direction substantially parallel to the axis of the cap, for example in order to obtain weakened areas in anti-tamper strips or access points for washing parts to eliminate residues from the cap. This type of cutting is also known under the name of vertical cutting.

[0009] Also known are cutting devices suitable for cutting the side wall in a radial position of the cap both horizontally and vertically. The latter generally comprise a knife for horizontal cutting, downstream of which is located an insert provided with a vertical blade for cutting the cap by means of vertical cutting.

[0010] Also known are cutting devices having a knife comprising a variety of blades in order to obtain a connection portion or a strip.

[0011] The various cutting devices described above are provided with knives manufactured for specific cutting geometries and for specific sizes of caps. The cap manufacturer in need of this has to purchase numerous knives and store them in its warehouse, equipping the cutting device with them whenever a change in the production batch of caps is required. Furthermore, having to equip the cutting device with new knives requires considerable machine downtime and this entails high production costs. Furthermore, the knives used to obtain the strips are structurally complex, requiring a large number of parts that must be replaced once worn, thus increasing production costs for manufacturing caps having such a complex structure. Summary of the invention

[0012] An object of the present invention is to improve a knife of known type for use in bottle cap cutting equipment.

[0013] Another object of the present invention is to provide a cutter for a bottle cap cutting device, which is used to perform cutting on a strip or other elements on a side wall of a plastic bottle cap and has a relatively simple structure.

[0014] Another object of the invention is to provide a tool which is more versatile than known tools and which can be used to sever a variety of cutting geometries with slight variations.

[0015] According to the present invention there is provided a tool as defined by the accompanying claims.

[0016] Thanks to the invention, it is possible to provide a tool with a layered structure for performing cuts with more or less complex geometries by superimposing cutting tools having cutting profiles configured according to different inclinations.

[0017] Thanks to the invention, it is possible to provide one or more assembly configurations which allow the cutting geometry to be applied to the bottle cap to be varied by adding and / or replacing cutting tools in the layered structure.

[0018] This allows the geometry of the cut to be varied using the same tool or by replacing a limited number of components therein. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The present invention may be better understood and carried out with reference to the accompanying drawings, in which some specific embodiments of the present invention are shown as non-limiting examples, and in which:

[0020] Figure 1 is a perspective view of a first specific example of a cutter for cutting bottle caps;

[0021] Figure 1A for Figure 1 A partial plan view of a tool illustrating two through holes;

[0022] Figure 2 for Figure 1 details of a first cutting tool, a second cutting tool, and a third cutting tool;

[0023] Figure 3 for Figure 1 Detail of , which shows a first cutting tool;

[0024] Figure 4 for Figure 1 Detail of , which shows a second cutting tool;

[0025] Figure 5 for Figure 1 Detail of , which shows a third cutting tool;

[0026] Figure 6 for Figure 1 A schematic diagram of the configuration of the blade of the tool;

[0027] Fig. 7A In the closed configuration of the bottle cap, Figure 1 A cylindrical projection view of the side wall of the bottle cap cut by a tool;

[0028] Figure 7B In the bottle cap opening configuration, Figure 1 A cylindrical projection view of the side wall of the bottle cap cut by a tool;

[0029] Figure 8is a schematic diagram of the configuration of a blade of a tool according to a second specific example;

[0030] Fig.9A In the closed position of the bottle cap, the Figure 8 A cylindrical projection view of the side wall of the bottle cap cut by the tool with the blade configuration;

[0031] Fig. 9B In the open position of the bottle cap, the Figure 8 A cylindrical projection view of the side wall of the bottle cap cut by the tool with the blade configuration;

[0032] Fig.10 A perspective view of a second embodiment of a tool for cutting bottle caps, the tool having Figure 8 The configuration of the blade;

[0033] Fig. 10A for Fig.10 A partial plan view of a tool illustrating two through holes;

[0034] Fig.11 for Fig.10 , which shows a first cutting tool, a second cutting tool, another third cutting tool, a fourth cutting tool and a fifth cutting tool;

[0035] Fig.12 for Fig.10 Detail of , which shows a fourth cutting tool and a fifth cutting tool;

[0036] Fig.13 for Fig.10 Detail of a further third cutting tool. DETAILED DESCRIPTION

[0037] See also Figures 1 to 6 , Fig. 7A , Figure 7B , describes a first specific example of a knife for cutting a bottle cap or bottle cover or closure, that is, a knife 100 configured to cut or cut a side wall 70 of a bottle cap 7. The bottle cap 7 is made of plastic and is designed to close a container, such as a bottle. The bottle cap 7 has a cup-shaped body and is provided with a closed end 8 and an open end 9.

[0038] The cutter 100 is configured to be mounted on a cutting device to obtain a cutting line and an incision on the bottle cap 7 .

[0039] The words "notch" or "groove" are used to indicate an area of ​​the cap 7 provided with a perforated notch, i.e. a slit where the continuity of the material is interrupted by the action of a knife. The word "notch" is used to indicate an area of ​​the cap 7 where the side wall 70 has a low thickness caused by the penetration of the knife into the material to a given depth without interrupting the continuity of the material.

[0040] The tool 100 includes a first cutting tool 10, a second cutting tool 20, and a third cutting tool 30. The tool 100 has a layered structure, wherein the third cutting tool 30 is disposed between the first cutting tool 10 and the second cutting tool 20. The first cutting tool 10, the third cutting tool 30, and the second cutting tool 20 are stacked on each other in a detachable assembly, as will be described below. The tool 100 is detachably fixed to the frame of the cutting device by a fastening member (not shown) such as a screw member or a bolt member, and the fastening member further allows the cutting tools 10, 20, 30 to be clamped and detachably fixed to each other. See FIG. Figure 1 In particular, each of the cutting tools 10, 20, 30 includes at least one hole 91, 92 of the through-hole type, which is configured to receive a fastening member so that the cutting tools 10, 20, 30 can be removed from or inserted into the hierarchical structure based on the stacking order from the top to the bottom tool. Figure 1A , in particular, the at least one hole 91, 92 may include at least one eccentric hole or slot 92, which is configured to allow the cutting tools 10, 20, 30 to be adjusted independently of each other, in particular on a plane parallel to the plane P. In particular, the at least one hole 91, 92 enables the selective removal of each cutting tool 10, 20, 30 to allow the removal and / or insertion of additional cutting tools, for example to replace a tool with a worn cutting edge or to change the configuration of the cutting edge. For example, it is possible to replace only the third cutting tool 30, thereby restoring the layered structure without replacing the first cutting tool or the second cutting tool.

[0041] The layered structure of the cutter 100 defines the cutting portion of the cutter 100, which is hereinafter indicated as the configuration of the cutting edge 60. In the present specification, the expression configuration of the cutting edge is used to indicate the configuration or group of cutting edges of various shapes and sizes that the cutter has, which allow the cutter to perform cutting and / or severing on the bottle cap 7 when the cutter 100 is mounted on a cutting device for severing and severing bottle caps.

[0042] See also Figures 8 to 13 , a second specific example of a tool, namely, tool 100' is described. The difference between tool 100' and tool 100 is that two cutting tools are added, namely, a fourth cutting tool 40 and a fifth cutting tool 50, and that cutting tool 30 is replaced by another cutting tool 30'. This hierarchical structure defines the configuration of the cutting portion of tool 100', namely, the cutting edge 60'.

[0043] The cutter 100, 100' is suitable for forming a tamper-evident strip or ring 72 in the bottle cap 7 ( Fig. 7A , Figure 7B , Fig.9A, Fig. 9B ). The cutters 100, 100' are adapted to form the connecting portions 74a, 74b between the tamper-evident ring 72 and the side wall 70. Even when the cap 7 is removed from the mouth of the container (to which it has been applied in order to open the container and access the contents), i.e., when the cap is in the open configuration D ( Figure 7B , Fig. 9B ), the main body of the bottle cap 7 is still connected to the anti-tampering ring 72 by means of the connecting parts 74a, 74b.

[0044] The cutter 100, 100' inside the cutting device cooperates with a rotation axis (not shown) holding the cap 7 by rotating the cap about a rotation axis R parallel to the axis of the cap 7 or coinciding with the axis. The rotation axis brings the side wall 70 of the cap 7 into contact with the cutting portion of the cutter 100, 100', so that the cap 7 moves along a substantially circular arc path in the advancing direction T and rotates the cap 7 about the rotation axis R by rolling the cap against the cutting portion of the cutter 100, 100'. As is known, a possible slippage of the cap relative to the axis or the cutting portion is undesirable. Depending on the configuration of the cutting edge 60, 60' of the cutting portion of the cutter 100, 100', there is a corresponding cut on the side wall 70 of the cap 7. In other words, this configuration of the cutting edge 60, 60' is shown on the side wall 70 of the cap 7 in a negative manner.

[0045] See also Figure 1 and Fig.10 It should be noted that the advancement direction T and the rotation direction R of the bottle cap 7 are merely indicative and the effect of the cutters 100, 100' on the bottle cap 7 is equivalent to the effect that can be obtained if both the advancement direction T and the rotation direction R of the bottle cap are reversed.

[0046] See also Figure 6 , Figure 8 , Figure 7B , Fig. 9B After the cutting and slitting action, the arrangement of the cutting edges 60, 60' defines a skirt 71 and an anti-tamper strip or ring 72 in the side wall 70. In the following description, the term "skirt" is associated with the side wall portion 70 having a closed end 8, while the expressions "anti-tamper strip" or "anti-tamper ring" are associated with the side wall portion 70 having an open end 9 and being substantially annular.

[0047] The skirt 71 and the tamper-evident strip 72 are connected to each other by means of a plurality of connecting portions or strips 74a, 74b and a plurality of bridges 73, i.e. elements made of plastic material which are intended to be broken by the user when opening the container to which the bottle cap 7 is applied for the first time to demonstrate the destruction of the container's closure.

[0048] In particular, see Fig. 7A and Fig.9A, the side wall 70 is shown on the representation plane as the unfolded bottle cap 7 presenting a closed configuration C, wherein the bridge 73 is integral and together promotes the legs 74a, 74b to join the tamper-evident strip 72 to the skirt 71. The bottle cap adopts the closed configuration C before the bottle cap is applied to the container or after its application and before the container is opened for the first time and the bottle cap is actuated.

[0049] In particular, see Figure 7B and Fig. 9B , the cap 7 with the side wall 70 shown on the representation plane as unfolded presents an open configuration D, wherein the bridge 73 is broken, the skirt 71 is spaced apart from the tamper-evident strip 72 and the tamper-evident strip 72 is connected to the skirt 71 only by the legs 74a, 74b. The open configuration D is adopted by the cap applied to the container and after the container is opened for the first time (the cap is removed therefrom).

[0050] See again Figures 1 to 3 and in particular see Figure 3 The first cutting tool 10 has a plate-like structure, that is, it extends mainly along two main dimensions relative to the third transverse dimension and in particular relative to the rectangular base. The first cutting tool 10 has two flat faces substantially parallel to each other and to the first plane P: a first lower face 14 and a first upper face 15.

[0051] In the first peripheral region 17, the first cutting tool 10 comprises: a plurality of first blades 11, such as first blades 11a, 11b, 11c; and a plurality of first grooves 16a, 16b. The plurality of first blades 11a, 11b, 11c and the first grooves 16 of the first cutting tool 10 are arranged alternately along the first peripheral region 17 of the cutting tool 10, thereby defining a concave or sawtooth profile obtained by projecting the first cutting tool 10 onto the plane P. The first blades 11a, 11b, 11c may comprise one or more first cavities 13 arranged to form a bridge 73. Furthermore, the first blades 11a, 11b, 11c are provided with first cutting edges 12a, 12b, 12c on their free ends.

[0052] The first cutting edges 12a, 12b, 12c are in the same first plane parallel to the plane P, so the cutting tool 10 is a horizontal cutting tool. The first plane is at a given height relative to the plane P, on a vertical axis Z orthogonal to the plane P. The engagement of a plurality of first cutting edges 12a, 12b, 12c allows obtaining a substantially circular first arc curve, the center of which is located outside the cutter 100, 100' on an axis substantially orthogonal to the plane P. The first cutting tool 10 is configured to facilitate the formation of the prongs 74a, 74b on the side wall 70 together with the second cutting tool 20 and the third cutting tool 30, and it performs the cutting and cutting of the separation skirt 71, the formation of the anti-tamper strip 72. The first cavity 13 is spaced apart and appropriately sized so as not to interrupt the continuity of the material, for example so as not to locally alter or cut the side wall 70 of the bottle cap without perforating it, so as to allow the formation of the bridge 73.

[0053] See also Figure 1 , Figure 2 and Figure 4 The second cutting tool 20 has a plate-like structure extending parallel to the plane P and in particular parallel to the rectangular base. The second cutting tool 20 has two flat surfaces substantially parallel to each other and parallel to the plane P, namely, a second lower surface 24 and a second upper surface 25.

[0054] In the second peripheral region 27, the second cutting tool 20 comprises: a plurality of second blades 21, including, for example, second blades 21a, 21b; and a plurality of second grooves 26. The second blades 21a, 21b and the second grooves 26 are alternately arranged along the second peripheral region 27 of the cutting tool 20, thereby defining a concave profile in an orthogonal projection on the plane P. The second blades 21a, 21b may comprise one or more second cavities 23 arranged in defined positions in the second blades 21a, 21b. The second blades 21a, 21b are provided with second cutting edges 22a, 22b on their free ends.

[0055] The second cutting edges 22a, 22b are in the same first plane parallel to the plane P, so the cutting tool 20 is a horizontal cutting tool. The engagement of the plurality of second cutting edges 22a, 22b allows obtaining a substantially circumferential second arcuate curve, the center of which is located outside the tool 100 on a second axis substantially orthogonal to the plane P. The second curve defined by the plurality of second cutting edges 22a, 22b is in a second plane parallel to the plane P at a second height different from the first height on the vertical axis Z. The second cutting tool 20 is configured to facilitate the formation of the prongs 74a, 74b on the side wall 70 of the bottle cap together with the first cutting tool 10 and the third cutting tool 30. The second cavities 23 are spaced apart and are suitably sized so as not to interrupt the continuity of the material, for example so as not to locally alter or cut but not perforate the side wall 70 of the bottle cap, so as to allow the formation of the bridge 73.

[0056] See also Figure 1 , Figure 2 and Figure 5 The third cutting tool 30 has a plate-like structure parallel to the plane P and in particular parallel to the rectangular base. The third cutting tool 30 has two flat surfaces substantially parallel to each other: namely, a third lower surface 37 and a third upper surface 38 .

[0057] The third cutting tool 30 is configured to perform an oblique cut on the side wall 70. In the peripheral region 36, the third cutting tool 30 comprises one or more third oblique blades 31a, 31b, 31c, 33, which are provided with respective oblique cutting edges 32a, 32b, 32c, 34. With reference to a reference plane passing through the vertical axis Z and tangential to the advancing direction T, at least two oblique cutting edges 32a, 34 have different inclinations from each other.

[0058] Specifically, the inclined cutting edge 32a has a negative inclination, and the inclined cutting edge 34 has a positive inclination. The negative inclination corresponds to a cutting edge whose upper end is retreated relative to the lower end along the advancement direction T, and vice versa, the positive inclination corresponds to a cutting edge whose upper end is advanced relative to the lower end along the advancement direction T. In fact, the inclined cutting edge 32a includes its upper end 92 and its lower end 91, and considering the advancement direction T, the upper end 92 is retreated relative to the lower end 91, so the inclined cutting edge 32a has a negative inclination. Similarly, the inclined cutting edge 34 includes its upper end 94 and its lower end 93, and considering the advancement direction T, the upper end 94 is more advanced relative to the lower end 93, so the inclined cutting edge 34 has a positive inclination.

[0059] In addition to at least two inclined cutting edges 32a, 34 having different inclinations, the third cutting tool 30 also includes other third blades 31b, 31c with negative inclination, wherein the third blades have negative inclinations at the respective free ends of the inclined cutting edges, and may include one or more third vertical blades (not shown) having respective vertical cutting edges.

[0060] Thus, relative to a Cartesian plane formed by a vertical axis Z orthogonal to the plane P and an axis oriented substantially in the advancement direction T, starting from any point in the advancement direction T, the inclined cutting edge of the third inclined blade may be oriented in the peripheral zone 36 in the following alternative ways:

[0061] - having a negative inclination, such as the third blade 31a, 31b, 31c having a negative inclination;

[0062] - having a positive inclination, such as the third blade 33 having a positive inclination;

[0063] - vertically (not shown in the figures), that is to say parallel to the Z axis.

[0064] The peripheral zone 36 of the third cutting tool 30 defines a substantially circumferential third arcuate curve in a third plane, the center of the circumference being located outside the tool 100 on a third axis substantially orthogonal to the plane P. The peripheral zone 36 further defines a surface of the third cutting tool 30 against which the side wall 70 of the bottle cap 7 can rotate about its rotation axis R when the tool 100 performs severing and cutting on the side wall 70. In other words, the third curvature defined by the peripheral zone 36 facilitates guiding the bottle cap 7 along its path for interaction with the tool 100 in the advancement direction T.

[0065] The third blades 31a, 31b, 31c with negative inclination and the third blade 33 with positive inclination may include cavities (not shown) which are spaced apart and appropriately sized so as not to interrupt the continuity of the material, for example so as not to locally alter or cut but not perforate the side wall 70 of the bottle cap so as to allow the formation of the bridge 73.

[0066] See also Figure 5 , a bridge made of plastic material can be formed on the bottle cap 7 at a cavity 35, which is defined by the respective lower ends and / or the respective upper ends of the inclined cutting edges, which are arranged at a predefined distance, in particular at a significantly smaller distance. For example, consider the inclined cutting edge pair 32a, 34, the respective lower ends 91 and 93 are at a limited distance and form a cavity 35, which, by the action of the knife 100, forms a corresponding bridge 75 ( Fig. 7A , Figure 7B ), when the closed configuration C of the bottle cap 7 is changed to the open configuration D, the bridge will break similar to the bridge 73. During cutting, a similar bridge is formed between the upper end 94 of the cutting edge 34 with a positive inclination and the respective upper ends of the cutting edge 32b with a negative inclination.

[0067] The third inclined blade 31a extends below the third lower face 37 of the third cutting tool 30 and is supported by a support protrusion 39a which protrudes below the third inclined blade from the third lower face 37. In a version not shown in the figures, the third inclined blade 31a may be included laterally in the thickness of the third cutting tool 30, i.e. its lower end does not protrude from the third lower face 37. In this version, the support protrusion 39a may not be present.

[0068] The third inclined blade 31b extends below the third lower face 37 of the third cutting tool 30 and is also supported by another support protrusion 39b which protrudes from the third lower face 37 below the third inclined blade. Another support protrusion 39b may be obtained in the support protrusion 39a. In a version not shown in the figures, the third inclined blade 31b may be completely contained in the thickness of the third cutting tool 30, i.e. its lower end does not protrude from the third lower face 37. In this version, the support protrusion 39b may not be present.

[0069] Each support protrusion 39a, 39b is shaped so as to be received in a groove present on the first cutting tool 10. In particular, both support protrusions 39a, 39b are received in the groove 16a of the first cutting tool 10.

[0070] The third cutting tool 30 is configured to form an inclined cut 79 on the side wall 70 of the bottle cap 7 , wherein the inclined cut also includes a vertical cut.

[0071] Still viewing Figures 1 to 5 , the assembly configuration of the tool 100 provides for the insertion of the third cutting tool 30 between the first cutting tool 10 and the second cutting tool 20, as described below:

[0072] In this assembled configuration of tool 100:

[0073] - the second lower face 24 is in contact with the third upper face 38;

[0074] The third lower face 37 is in contact with the first upper face 15 .

[0075] Furthermore, in this assembled configuration of tool 100:

[0076] - a first axis having a first curvature defined by the first cutting edges 12a, 12b, 12c of the first cutting tool 10;

[0077] - a second axis having a second curvature defined by the second cutting edges 21a, 21b of the second cutting tool 20; and

[0078] a third axis having a third curvature defined by the peripheral zone 36 of the third cutting tool 30

[0079] They essentially overlap with each other.

[0080] Furthermore, in this assembled configuration of the tool 100, the relative positions of:

[0081] - first blades 11a, 11b, 11c;

[0082] - second blades 21a, 21b;

[0083] - a third blade 31a, 31b, 31c having a negative inclination;

[0084] - a third blade 33 having a positive inclination; and

[0085] - Possible third vertical blade;

[0086] The configuration of the cutting edge 60 of the knife 100 is defined.

[0087] View now Figure 6 , the configuration of the cutting edge 60 of the tool 100 is defined by:

[0088] - first cutting edges 12a, 12b, 12c, which are in a first plane parallel to the plane P;

[0089] - second cutting edges 22a, 22b lying in a second plane parallel to the plane P;

[0090] - third cutting edges 32a, 32b, 32c with negative inclination and a third cutting edge 34 with positive inclination, which are arranged in an inclined manner relative to the plane P.

[0091] The configuration of the cutting edge 60 may include a possible third vertical cutting edge orthogonal to the plane P.

[0092] As already mentioned above, the first cutting edges 12a, 12b, 12c and the second cutting edges 22a, 22b are arranged at different heights along the vertical axis Z relative to each other, ie at different distances from the plane P.

[0093] See also Fig. 7A and Figure 7B , depending on the relative position between the cutting edges of the cutting tool, the cutter 100 forms different components on the side wall 70 of the bottle cap 7:

[0094] one or more intended unraveling lines 78a, 78b, 78c arranged in the same plane and obtained by the penetration of the first cutting edge 12a, 12b, 12c through the thickness of the side wall 70;

[0095] - one or more connecting parts or legs 74a, 74b, each of which in turn comprises:

[0096] - a central portion 77a, 77b obtained by penetration of the first cutting edges 12a, 12b, 12c and the second cutting edges 22a, 22b; and

[0097] - joint portions 76a, 76b obtained by penetration of the second cutting edges 22a, 22b and the third cutting edges 32a, 32b, 32c with negative inclination and the third cutting edge 34 with positive inclination;

[0098] - one or more inclined cuts 79 due to the penetration of the third blade 31a, 31b, 31c with negative inclination and the third blade 34 with positive inclination.

[0099] For details, see Figure 6 , along the advancing direction T, the tool 100 comprises:

[0100] - an opening forming portion 68a comprising a first cutting edge 12a lying in a first plane parallel to the plane P. The opening forming portion 68a extends, for example, about 50% of the length of the knife 100. The opening forming portion 68a ( Fig. 7A , Figure 7B );

[0101] - Connection forming part 64a. The connection forming part 64a extends, for example, about 10% of the length of the cutter 100. The prong 74a corresponds to the connection forming part 64a on the bottle cap 7. The connection forming part 64a in turn comprises:

[0102] a connection forming central portion 67a, in which the last part of the first cutting edge 12a is superimposed along the vertical axis Z on the initial part of the second cutting edge 22a lying in the second plane, i.e. at a higher height relative to the first cutting edge 12a. The connection forming portion 67a extends, for example, about 2 / 3 of the connection forming portion 64a. The respective central portion of the limbs 77a corresponds to the connection forming central portion 67a;

[0103] - a joint forming portion 66a, downstream of the connection forming central portion 67a, in which there is a short section of the second cutting edge 22a, the final section of which ends at the initial end of the third cutting edge 32a with a negative inclination. In other words, the joint forming portion 66a comprises the second cutting edge 22a and the final section of the third cutting edge 32a with a negative inclination. The joint forming portion 66a extends, for example, about 1 / 3 of the connection forming area 64a. The respective joint portion 76a corresponds to the joint forming portion 66a on the bottle cap 7;

[0104] - a branch-forming central portion 69, in which the final end of the third cutting edge 32a with a negative inclination terminates at a height that may be equal to or lower than the height of a plane parallel to the first plane in which the first cutting edge 12a is located. The initial end of the third cutting edge 34 with a positive inclination is located at the final end of the third cutting edge 32a with a negative inclination. The third cutting edge 34 with a positive inclination terminates at a height that is equal to but higher than the height of the second plane in which the second cutting edge 22a is located. The final upper end of the third cutting edge 34 with a positive inclination is located at the initial upper end of the third cutting edge 32b inclined with a negative inclination. The branch-forming central portion 69 further includes the third cutting edge 34 with a positive inclination and the third cutting edge 32b with a negative inclination. One or more inclined cuts 79 correspond to the branch-forming central portion 69 on the side wall 70. The distance over which the branch-forming central portion 69 extends is, for example, between 5% and 10% of the length of the tool 100;

[0105] a further opening forming portion 68b, which comprises the first cutting edge 12b lying in the first plane. The further opening forming portion 68b extends, for example, for a distance between 5% and 10% of the length of the knife 100. The relative intended detachment line 78b corresponds to the further opening forming portion 68b;

[0106] - Another connection forming part 64b. The other connection forming part 64b extends, for example, about 10% of the length of the tool 100. The support 74b another connection forming part 64b. The other connection forming part 64b in turn comprises:

[0107] a further connection-forming central portion 67b, in which the last part of the first cutting edge 12b is superimposed along the vertical axis Z on the initial part of the second cutting edge 22b lying in the second plane, i.e. at, for example, a higher height relative to the first cutting edge 12a. The further connection-forming central portion 67b extends, for example, about 2 / 3 of the further connection-forming portion 64b. The respective branch central portion 77b corresponds to the further connection-forming central portion 67b;

[0108] - a further joint forming portion 66b, downstream of the further connection forming central portion 67b, in which there is a short section of the second cutting edge 22b, the final section of which ends at the initial end of the third cutting edge 32c with a negative inclination. In other words, the further joint forming portion 66b comprises the second cutting edge 22b and the final section of the third cutting edge 32c with a negative inclination. The further joint forming portion 66b extends, for example, about 1 / 3 of the further connection forming portion 64b. The respective joint portion 76b corresponds to the further joint forming portion 66b on the bottle cap 7;

[0109] a further opening forming portion 68c in which the first cutting edge 12c lying in the first plane is located at the final end of the third cutting edge 32c having a negative inclination, which extends for e.g. about 20% of the length of the tool 100 along the advancement direction T. A respective intended tearing line 78c corresponds to the further opening forming portion 68c.

[0110] It should be observed that, due to its suitability for cutting objects having substantially cylindrical symmetry, the configuration of the cutting edge 60 may have a different order of the portions of the configuration of the cutting edge 60 described above, subject to the proviso that continuity is observed; for example, the opening forming portions 68a and 68c of the configuration of the cutting edge 60 may be merged together into a single opening forming portion along the advancing direction T as an initial or final portion of the configuration of the cutting edge 60.

[0111] In the context of the present invention, the terms “initial / final”, “starts / start / ends / end”, “upstream / downstream” are used to indicate the order in which the projections of the ends of the cutting edges along the advancement direction T are found.

[0112] The hierarchical structure and relative assembly configuration of the cutters allow the configuration of the cutting edges to be cut on the bottle cap to be changed by adding and / or replacing cutting tools in the assembly configuration. In particular, under the condition that a horizontal cut can be maintained for a given size of the bottle cap, the third cutting tool can be replaced to produce different shapes of prongs on a bottle cap with the same size without also having to replace the first and second cutting tools. This is allowed by the fact that the shape of the prong is essentially determined by the cutting edges with different inclinations provided in the third cutting tool.

[0113] In the second illustrated embodiment, the cutter 100' comprises additional cutting tools configured to cut the side surface 70 of the bottle cap 7, namely, a fourth cutting tool 40 and a fifth cutting tool 50. In the embodiment of the cutter 100', a first cutting tool 10 and a second cutting tool 20 are also present, and the cutting tool 30' has the same Figures 1 to 6 The same number of blades are provided in versions with different configurations, as described below. The fourth cutting tool 40, the first cutting tool 10, the third cutting tool 30', the second cutting tool 20 and the fifth cutting tool 50 are stacked on top of each other in a detachable assembly. The cutter 100' is detachably fixed to the frame of the cutting device by means of a fastening member (not shown) such as a screw member or a bolt member, which further allows the cutting tools 10, 20, 30', 40, 50 to be clamped and detachably fixed to each other. See FIG. Fig.10In particular, each of the cutting tools 10, 20, 30', 40, 50 comprises at least one hole 91', 92' of the through-hole type, which is configured to receive a fastening member, so that the cutting tools 10, 20, 30', 40, 50 can be removed from or inserted into the hierarchical structure according to the stacking order from the top to the bottom tool. Fig. 10A , in particular, the at least one hole 91 ', 92' may include at least one eccentric hole or slot 92', which is configured to allow the cutting tools 10, 20, 30' to be adjusted independently of each other, in particular on a plane parallel to the plane P. In particular, the at least one hole 91 ', 92 enables the selective removal of each cutting tool 10, 20, 30' to allow the removal and / or insertion of additional cutting tools, for example to replace a tool with a worn cutting edge or to change the configuration of the cutting edge. For example, it is possible to replace only the third cutting tool 30', thereby restoring the layered structure without replacing the other cutting tools.

[0114] See also Fig.12 The fourth cutting tool 40 has a plate-like structure parallel to the plane P and in particular parallel to the rectangular base. The fourth cutting tool 40 has two flat surfaces substantially parallel to each other: namely, a fourth lower surface 44 and a fourth upper surface 45 .

[0115] In the fourth peripheral area 47, the fourth cutting tool 40 includes a fourth blade 41. The fourth blade 41 has a fourth cutting edge 42 at its free end. The fourth cutting edge 42 or at least one point thereof is located on a fourth arc curvature of a substantially circumference, the center of which is located outside the tool 100' on a fourth axis substantially orthogonal to the plane P. The fourth curvature and therefore the fourth cutting edge 42 are located on a fourth plane, the height of which is lower than the first cutting edge 12a. The fourth cutting edge 42 has a longitudinal extension length that is less than the circumference of the side wall 70 of the bottle cap to be processed. The fourth cutting tool 40 is configured to form an auxiliary groove 75' ( Fig.9A and Fig. 9B ). The fourth cutting tool 40 cooperates with the fifth cutting tool 50 and the third cutting tool 30' to form the prongs 74a, 74b. The fourth blade 41 may include one or more fourth cavities 43, which are spaced apart and appropriately sized so as not to interrupt the continuity of the material, for example so as not to locally alter or cut but not perforate the side wall 70 of the bottle cap, so as to allow the formation of the bridge 73. In particular, the fourth cutting edge 42 includes only one cavity 43.

[0116] Still viewing Fig.12The fifth cutting tool 50 has a plate-like structure parallel to the plane P and in particular parallel to the rectangular base. The fifth cutting tool 50 has two flat surfaces substantially parallel to each other and parallel to the plane P: that is, a fifth lower surface 55 and a fifth upper surface 55 .

[0117] In the fifth peripheral zone 57, the fifth cutting tool 50 comprises a fifth blade 51. The fifth blade 51 has a fifth cutting edge 52 at its free end. The fifth cutting edge 52 or at least one point thereof is located on a fifth arc curvature of a substantially circumference, the center of which is located outside the tool 100' on a fifth axis substantially orthogonal to the plane P. The fifth curvature is located on a fifth plane. The fifth cutting edge 52 has an extension length that is less than the circumference of the side wall 70 of the bottle cap to be processed. The fifth cutting tool 50 is configured to form another auxiliary groove 79' ( Fig.9A and Fig. 9B ). The fifth cutting tool 50 cooperates with the fourth cutting tool 40 and the third cutting tool 30' to form the branches 74a, 74b.

[0118] The fifth blade 51 may include one or more fifth cavities 53 that are spaced apart and appropriately sized so as not to interrupt the continuity of the material, such as to locally alter or cut but not perforate the side wall 70 of the bottle cap, so as to allow the formation of the bridge 73. In particular, the fifth cutting edge 51 includes only one cavity 53.

[0119] See also Fig.13 , another third cutting tool 30 'has a structure similar to that of the previously described third cutting tool 30, which will be repeated for the sake of brevity. Therefore, similar parts in terms of shape and function are indicated by the same reference numerals in the drawings. The difference between another third cutting tool 30 ' and the third cutting tool 30 is the configuration of the other third blades 31a ', 31b ' with negative inclination and another third blade 33 ' with positive inclination. In fact, as will be described in detail below, the ends of the third cutting edges 32a ', 32b ' with negative inclination and the end of the third cutting edge 34 ' with positive inclination can be spaced apart by an amount that is substantially equal to the extension amount of the fourth cutting edge 42 and / or the fifth cutting edge 52 along the advancing direction T.

[0120] The third cutting tool 30' is configured to perform an oblique cut on the side wall 70. In its peripheral zone 36', the third cutting tool 30 comprises one or more third oblique blades 31a', 31b', 31c', 33', which are provided with respective oblique cutting edges 32a', 32b', 32c', 34'. With reference to a reference plane passing through the vertical axis Z and tangential to the advancement direction T, at least two oblique cutting edges 32a', 34' have different inclinations from each other.

[0121] In particular, the inclined cutting edge 32a' has a negative inclination, and the inclined cutting edge 34' has a positive inclination. The negative inclination corresponds to a cutting edge whose upper end is set back relative to the lower end along the advancement direction T, and vice versa, the positive inclination corresponds to a cutting edge whose upper end is advanced relative to the lower end along the advancement direction T. In fact, the inclined cutting edge 32a' includes its upper end 92' and its lower end 91', and considering the advancement direction T, the upper end 92' is set back relative to the lower end 91', so the inclined cutting edge 32a' has a negative inclination. Similarly, the inclined cutting edge 34' includes its upper end 94 and its lower end 93, and considering the advancement direction T, the upper end 94' is more advanced relative to the lower end 93', so the inclined cutting edge 34' has a positive inclination.

[0122] Similar to the inclined cutting edge 32a, the inclined cutting edge 32a' extends below the height of the third lower face 37', and it is supported by a supporting protrusion 39a'. Even the inclined cutting edge 34' extends below the height of the third lower face 37', and it is supported by another supporting protrusion 39b'. Moreover, the inclined cutting edge 34' extends even above the height of the third upper face 38', supported by a supporting protrusion 39c', which protrudes from the third upper face 38' superimposed thereon.

[0123] The fifth blade 51 thus rests on the support protrusion 39c'. Fig.11 . The support protrusion 39c' can be received in one or more second grooves 26 of the second cutting tool 20. A third inclined cutting edge 32b' is obtained on a respective inclined blade 31b', which extends above the third upper face 38' and is supported by a respective protrusion protruding from the third upper face 38' above the third upper face 38'. A protrusion can be obtained in the support protrusion 39c', for example it can be the only body with the support protrusion 39c'.

[0124] The aforementioned protrusions and projections are received in recesses of the first and second cutting tools similar to those provided in the version of the tool 100 .

[0125] See also Fig.10 and Fig.11 The assembled configuration of the tool 100' provides for insertion of the third cutting tool 30' between the first cutting tool 10 and the second cutting tool 20 and between the fourth cutting tool 40 and the fifth cutting tool 50, as described below.

[0126] In this assembled configuration of tool 100':

[0127] - the fifth lower face 54 is in contact with the second upper face 25;

[0128] - the second lower face 24 is in contact with the third upper face 38 ′;

[0129] - the third lower face 37 ′ is in contact with the first upper face 15 ;

[0130] The first lower face 14 is in contact with the fourth upper face 45 .

[0131] Furthermore, in this assembled configuration of tool 100':

[0132] a first axis having a first curvature defined by the first cutting edges 12a, 12b, 12c of the first cutting tool 10,

[0133] a second axis having a first curvature defined by the second cutting edges 21a, 21b of the second cutting tool 20,

[0134] a third axis having a third curvature defined by the peripheral zone 36 ′ of the third cutting tool 30 ′,

[0135] a fourth axis having a fourth curvature, on which at least one point of the fourth cutting edge 42 lies, and

[0136] a fifth axis having a fifth curvature, on which at least one point of the fifth cutting edge 52 is located,

[0137] They essentially overlap with each other.

[0138] Furthermore, in this assembled configuration of the tool 100', the relative positions between the first blades 11a, 11b, 11c, the second blades 21a, 21b, the third blades 31a', 31b', 31c' with negative inclination, the third blade 33' with positive inclination and possible third orthogonal blades define the configuration of the cutting edge 60' of the tool 100'.

[0139] See also Figure 8 , the configuration of the cutting edge 60' of the tool 100' is defined by:

[0140] - first cutting edges 12a, 12b, 12c, which are in a first plane parallel to the plane P;

[0141] - a second cutting edge 22a, 22b, which is located in a second plane parallel to the first plane;

[0142] - other third cutting edges 32a', 32b', 32c' with a negative inclination and a third cutting edge 34' with a positive inclination, said edges being arranged in an inclined manner with respect to the plane P and / or a possible third cutting edge orthogonal to the plane P;

[0143] - a fourth cutting edge 42 lying in a fourth plane parallel to the plane P;

[0144] A fifth cutting edge 52 , which lies in a fifth plane parallel to the plane P.

[0145] The ends of the third cutting edges 32a', 32b', 32c' with negative slope and the end of the third cutting edge 34' with positive slope are positioned close to or in contact with the ends of other cutting edges, such as close to or in contact with the ends of cutting edges 12a, 12b, 12c and / or the ends of cutting edges 22a, 22b and / or the ends of the third cutting edges 32a', 32b', 32c' with negative slope and the end of the third cutting edge 34' with positive slope and / or the end of the fourth cutting edge 42 and / or the end of the fifth cutting edge 52. Where the ends of the cutting edges 32a', 32b' with negative slope and the end of the third cutting edge 34' with positive slope are positioned close to the other ends of the cutting edges, there is an identified third cavity that is spaced apart and appropriately sized so as not to interrupt the continuity of the material, such as so as not to alter or cut but not perforate the side wall 70 of the bottle cap, so as to allow the formation of a bridge.

[0146] See also Fig.9A and Fig. 9B Depending on the relative position between the cutting edges of the cutting tools, the configuration of the tool 100' forming the inclined cut 79' on the side wall 70 of the bottle cap 7 may be different from the described configuration, which is obtained by penetrating the third blade 31a', 31b' with a negative inclination and the third blade 33', the fourth blade 41 and the fifth blade 51 with a positive inclination.

[0147] For details, see Figure 8 , Fig.9A , Fig. 9B and Fig.10 , following the path along the advancing direction T, the tool 100 ′ comprises:

[0148] - Auxiliary central portion 69'. The auxiliary central portion 69' comprises a fourth cutting edge 42, a third cutting edge 34' with a positive inclination, a fifth cutting edge 52 and a third cutting edge 32b' with a negative inclination, wherein the final end of the third cutting edge 32a' with a negative inclination terminates at a height which may be equal to or lower than the height of a plane parallel to the first plane P where the first cutting edge 12a is located. The initial end of the fourth cutting edge 42 located on the fourth plane (i.e., at a height lower than the height of the plane P) is located at the final end of the third cutting edge 32a' with a negative inclination. The final end of the fourth cutting edge 42 is located at or contacts the initial end of the third cutting edge 34' with a positive inclination which is arranged in an inclined or vertical manner. The third cutting edge 34' with a positive inclination terminates at a height which may be equal to or higher than the height of the second plane where the second cutting edge 22a is located. The final end of the third cutting edge 34' having a positive inclination is close to or in contact with the initial end of the fifth cutting edge 52 located on the fifth plane, that is, at a height that may be higher than the height of the second plane where the second cutting edge 22a is located. The final end of the fifth cutting edge 52 is located at the third cutting edge 32b' having a negative inclination. Auxiliary center portion 69'

[0149] Corresponding to a plurality of oblique cuts and flat cuts, wherein the flat cut is inserted between two oblique cuts with different inclinations on the side wall 70; a plurality of oblique cuts and flat cuts allow the two legs 74a, 74b to be separated from each other. The auxiliary central portion 69' extends for a distance of, for example, between 5% and 10% of the length of the cutter 100'.

[0150] Due to the shape of the knives 100, 100', it is possible to remove the third cutting tool 30; 30' from the layered structure and replace it with a different third cutting tool to obtain different shapes of the connecting parts or legs 74a, 74b. This simplifies the cutting device and reduces the machine downtime to equip the cutting device with different knives. In addition, the cutting device also maintains a certain flexibility under the condition that it is possible to perform cutting with knives in which a few cutting tools are to be replaced in order to change the geometry of the cut on the bottle cap.

[0151] The illustrated example shows a slotted bottle cap with two limbs, both of which are inclined with a negative inclination relative to the advancing direction T, as can be seen in the open configuration D of the bottle cap. Obviously, it will not be difficult for a person skilled in the art to modify the number and configuration of the cutting edges of the cutter 100, 100' for cutting bottle caps with a number of limbs greater than two (for example, three or four) limbs, the cutting edges being inclined with negative and / or positive inclinations according to various combinations.

[0152] It is possible to provide a number and arrangement of cutting edges with positive and negative inclinations, which are combined to form three inclined branches arranged with the same inclination, or a branch with a certain inclination and two consecutive branches with opposite inclinations, or three branches with alternating inclinations. It is also possible to provide another different arrangement of cutting edges, the combination of positive and negative inclinations of which may form four branches arranged with the same inclination, or a group of two branches with opposite inclinations, or four branches inclined with alternating inclinations, or three consecutive branches with the same inclination and one branch inclined with opposite inclinations.

[0153] In order to obtain three or four connecting parts or branches connecting the anti-tampering ring 72 and the side wall 70, in addition to the two inclined cutting edges 32a, 34, 32a', 34' in the third cutting tool 30, 30', other cutting edges configured to determine three or four connecting parts during use can also be provided.

[0154] In order to obtain three connecting parts or four connecting parts, instead of or in addition to the other cutting edges in the third cutting tool 30, 30', the tool 100, 100' may also include other cutting tools in the multiple cutting tools of its structure, and the other cutting tools are configured to cooperate with the first horizontal cutting tool 10, the second horizontal cutting tool 20 and the third cutting tool 30, 30', and cooperate with them when the additional cutting edges exist to determine the three connecting parts or four connecting parts connecting the anti-tampering ring 72 and the side wall 70 during use.

Claims

1. A tool (100') configured to be mounted on a cutting device to obtain a cutting line and an incision on a bottle cap (7) made of plastic and intended to close a container, the tool (100') being suitable for performing cutting and severing on a side wall (70) of the bottle cap (7) when the bottle cap (7) is moved along a path in a forward direction (T) by rotating about a rotation axis (R) to interact with the tool (100'), the tool (100') comprising a plurality of cutting tools arranged in a layered structure, wherein the cutting tools are stacked in parallel to a plane (P) and in the direction of a vertical axis (Z) orthogonal to the plane (P), the layered structure comprising: a first horizontal cutting tool (10) configured to perform a circumferential cut on the side wall (70) at a first height on the vertical axis (Z) to define a tamper-evident ring (72) in the bottle cap (7); a second horizontal cutting tool (20) configured for performing a further circumferential cut on the side wall (70) at a second height different from the first height on the vertical axis (Z); and a third cutting tool (30') configured to perform an oblique cut on the side wall (70) and to determine, in use together with the second horizontal cutting tool (20) and the first horizontal cutting tool (10), a connecting portion (74a, 74b) connecting the tamper-proof ring (72) and the side wall (70); The tool is characterized in that the third cutting tool (30') includes at least two inclined cutting edges (32a', 34') having an inclination different from each other, the inclination being referenced to a reference plane passing through the vertical axis (Z) and tangent to the advancing direction (T) of the bottle cap (7), the third cutting tool (30') being inserted between the first horizontal cutting tool (10) and the second horizontal cutting tool (20), wherein the third cutting tool (30') is configured to be removed from the layered structure so as to be replaced with a different third cutting tool to obtain a different shape of the connecting portion (74a, 74b), wherein the tool (100') includes horizontal cutting edges (42, 52), which are used to perform a respective flat cut inserted between two inclined cuts with different inclinations.

2. The tool (100') according to claim 1, wherein: The first horizontal cutting tool (10) comprises: a first lower surface (14) and a first upper surface (15), the first upper surface (15) being shaped to contact the third cutting tool (30'); A plurality of first blades (11a, 11b, 11c), each of the plurality of first blades having a plurality of first horizontal cutting edges (12a, 12b, 12c) at a free end thereof; The first blades (11a, 11b, 11c) are spaced apart by one or more first grooves (16a, 16b).

3. The tool (100') according to claim 1 or 2, wherein one of the horizontal cutting edges is at the same height as the first horizontal cutting edge (12a, 12b, 12c).

4. The tool (100') according to any one of claims 1 to 3, wherein: The second horizontal cutting tool (20) comprises: a second lower surface (24) and a second upper surface (25), the second lower surface (24) being shaped to contact the third cutting tool (30'); a plurality of second blades (21a, 21b) having, at a free end thereof, a plurality of second horizontal cutting edges (22a, 22b) extending along a second plane parallel to the plane (P); The second blades (21a, 21b) are spaced apart by one or more second grooves (26).

5. The tool (100') according to any one of claims 1 to 4, wherein one of the horizontal cutting edges is at the same height as the second horizontal cutting edge (22a, 22b).

6. The tool (100') according to any one of claims 1 to 5, wherein the third cutting tool (30') comprises a third lower surface (37') and a third upper surface (38'); the third lower surface (37') is shaped to contact the first horizontal cutting tool (10) and the third upper surface (38') is shaped to contact the second horizontal cutting tool (20).

7. A tool (100') as claimed in any one of the preceding claims, wherein the at least two inclined cutting edges (32a', 34') have opposite inclinations and respectively include a third cutting edge (32a') having a negative inclination and a third cutting edge (34') having a positive inclination, wherein the negative inclination corresponds to a cutting edge in which an upper end retreats relative to a lower end along the advancement direction (T) and vice versa, and the positive inclination corresponds to a cutting edge in which the upper end advances relative to a lower end along the advancement direction (T).

8. The tool (100') according to claim 7, wherein the third cutting edge (34') having a positive inclination is arranged downstream along the advancement direction (T) from the third cutting edge (32a') having a negative inclination.

9. A tool (100') as claimed in any one of the preceding claims, wherein in addition to the two inclined cutting edges (32a', 34'), the third cutting tool (30') further comprises another third inclined cutting edge (32b', 32c') arranged downstream of the two inclined cutting edges (32a', 34') along the advancing direction (T).

10. The tool (100') of claim 9, wherein the other third inclined cutting edge (32b', 32c') has a negative inclination in the reference plane, wherein the negative inclination corresponds to a cutting edge whose upper end is retreated relative to a lower end along the advancement direction (T).

11. A tool (100') as claimed in claim 10, wherein the third cutting tool (30') further includes a third inclined cutting edge (32c') having a negative inclination, which is arranged downstream of the other third inclined cutting edge (31b') having a negative inclination along the forward direction (T), wherein the negative inclination corresponds to a cutting edge whose upper end is retreated relative to a lower end along the forward direction (T).

12. A tool (100; 100') as claimed in any of the preceding claims, wherein the at least two inclined cutting edges (32a', 34'; 34', 32b') include respective lower ends and / or respective upper ends arranged at a predetermined distance (35) to form a bridge made of plastic material between the respective inclined cuts performed by the inclined cutting edges (32a', 34'; 34', 32b') in the side wall (70).

13. A tool (100') as claimed in any one of the preceding claims, wherein the at least two inclined cutting edges (32a', 34') include respective lower ends arranged at a preset distance, another blade (41) of another cutting tool (40) of the layered structure is inserted between the respective lower ends, and one of the horizontal cutting edges (41) is provided on the other blade (41).

14. A tool (100') as claimed in any one of the preceding claims, wherein the at least two inclined cutting edges (32a', 34') include respective upper ends, the at least two inclined cutting edges (32a', 34') are arranged at a preset distance, and another blade (51) of another cutting tool (50) of the layered structure is inserted between the respective upper ends, and the another blade (51) has one of the horizontal cutting edges (52).

15. A tool (100') as claimed in any of the preceding claims, wherein in addition to the at least two inclined cutting edges (32a', 34'), the third cutting tool (30') also includes other cutting edges, which are configured so as to determine three connecting parts or four connecting parts connecting the anti-tampering ring (72) and the side wall (70) during use.

Images