Abstract
Disclosed is a cutting device (1) for fabricating a fiber-based shell (10). The cutting device (1) has a first mandrel (20) which can rotate about an axis of rotation (D1) and on which the fiber-based shell (10) can be arranged. The cutting device (1) has a knife (30) which can rotate about an axis of rotation (M). The axis of rotation (D) of the first mandrel (20) and the axis of rotation (M) of the knife (30) are adjacent to each other.
Claims
1. A cutting device (1) for fabricating a fiber-based shell (10), in particular a fiber-based container, wherein the cutting device (1) has a first mandrel (20) which is rotatable about an axis of rotation (D1) and on which the fiber-based shell (10) is arrangeable, and has a knife (30) which is rotatable about an axis of rotation (M), wherein the axis of rotation (D) of the first mandrel (20) and the axis of rotation (M) of the knife (30) are adjacent to each other.
2. The cutting device (1) according to claim 1, wherein the first mandrel (20) has a drive device (21).
3. The cutting device (1) according to claim 1, wherein the knife (30) is mounted so as to be freely rotatable and is drivable by contact with the mandrel (20) or a fiber-based shell (10) arranged on the mandrel (20).
4. The cutting device (1) according to claim 1, wherein the knife (30) has a drive device.
5. The cutting device (1) according to claim 1, wherein the rotatable knife (30) is arranged displaceably relative to the first mandrel (20) such that a distance between the axis of rotation (D1) of the first mandrel (20) and the axis of rotation (M) of the knife (30) is adjustable
6. The cutting device according to claim 5, wherein the knife (30) is arranged on a carriage (31) or is arranged on a pivotable bracket.
7. The cutting device (1) according to claim 1, wherein the cutting device (1) has a second mandrel (40) which is rotatable about an axis of rotation (D2) and on which a further fiber-based shell (10) is arrangeable, wherein the axis of rotation (D) of the second mandrel (20) and the axis of rotation (M) of the knife (30) are adjacent to each other.
8. The cutting device (1) according to claim 7, wherein the second mandrel (40) has a drive device (41).
9. The cutting device (1) according to claim 7, wherein the knife (30) is arranged on a rotary plate (50) for centering between the first mandrel (20) and the second mandrel (40).
10. The cutting device (1) according to claim 1, wherein a diameter of the first mandrel (20) and optionally of the second mandrel (40) is in each case greater than an inner diameter of the fiber-based shell (10).
11. The cutting device (1) according to claim 1, wherein a stripping device (22, 42) is arranged in a receiving direction (A) after the knife (30) on the first mandrel (20) and optionally on the second mandrel (40).
12. The cutting device (1) according to claim 1, wherein a fan nozzle for the mandrel (20, 40) is arranged in a receiving direction (A) before the knife (30), in particular below the respective mandrel (20, 40).
13. The cutting device (1) according to claim 1, wherein the mandrel (20, 40) has a resilient, in particular cut-resistant, coating.
14. The cutting device (1) according to claim 1, wherein the mandrel (20, 40) has a groove which is shaped corresponding to the cutting edge of the knife so that the knife projects beyond the wall thickness of the fiber-based shell to be cut.
15. A fabricating table (5) for fabricating fiber-based shells (10) comprising a cutting device for fabricating a fiber-based shell (10), in particular a cutting device (1) according to claim 1, wherein the fabricating table (5) has a first conveying device (70) for feeding non-fabricated fiber-based shells (10) and has a second conveying device (80) for conveying away fabricated fiber-based shells (10′).
16. The fabricating table (5) according to claim 15, wherein a rotary plate (90) for conveying the fiber-based shells (10) to the cutting device (1) is arranged on the fabricating table (5).
17. A fiber-based shell (10′), in particular fiber-based container, wherein it has a knife-cut fabrication edge.
18. The cutting device (1) according to claim 1, wherein the axis of rotation (D) of the first mandrel (20) and the axis of rotation (M) of the knife (30) are at an angle of less than 10° relative to each other.
19. The cutting device (1) according to claim 18, wherein the axis of rotation (D) of the first mandrel (20) and the axis of rotation (M) of the knife (30) are at an angle of less than 5° relative to each other.
20. The cutting device (1) according to claim 18, wherein the axis of rotation (D) of the first mandrel (20) and the axis of rotation (M) of the knife (30) are parallel to each other.
Description
[0063] The invention is explained below with reference to schematic figures by means of exemplary embodiments. These show:
[0064] FIG. 1: a perspective view of a cutting device;
[0065] FIG. 1A: a bottom view of the cutting device from FIG. 1;
[0066] FIG. 2: a perspective view of the cutting device from FIG. 1;
[0067] FIG. 3: a schematic view of a knife/mandrel combination;
[0068] FIG. 4: a schematic view of a further knife/mandrel combination;
[0069] FIG. 5 to FIG. 10: a fabrication process;
[0070] FIG. 11: a plan view of a fabricating table;
[0071] FIG. 12: a perspective view of a further fabricating table;
[0072] FIG. 13: a detailed view of the fabricating table from FIG. 12.
[0073] FIG. 1 shows a perspective view of a cutting device 1. The cutting device 1 has a first mandrel 20 and a second mandrel 40. The first mandrel 20 can rotate about the axis of rotation D1 and the second mandrel 40 can rotate about the axis of rotation D2. A knife 30 is arranged essentially on an axis of symmetry between these two mandrels 20 and 40. The knife 30 is arranged rotatably about its axis of rotation M.
[0074] The knife 30 is also arranged linearly displaceably on a carriage 31. The carriage 31 is in turn arranged rotatably on a rotary plate 50. The rotary plate 50 and the mandrels 20 and 40 are arranged on a common support, not indicated in greater detail.
[0075] In the present illustration according to FIG. 1, two fan nozzles 60 are arranged below the knife 30, wherein each fan nozzle 60 is assigned to a mandrel 20, 40. The fan nozzles 60 are each distanced radially from the corresponding mandrel 20, 40.
[0076] A stripping device 22 is assigned to the first mandrel 20. A stripping device 42 is also assigned to the second mandrel 40. The stripping devices 22 and 42 are each displaceably arranged along the first axis D1 and the second axis D2, respectively.
[0077] FIG. 1A shows a view of the underside of the cutting device 1 from FIG. 1. In this figure, the knife 30 is arranged centrally in relation to the two mandrels 20, 40, but not yet in engagement with fiber-based shells potentially located on the mandrels. As already explained with regard to FIG. 1, the entire knife 30 is arranged on a rotary table 50. Two resilient stops, which are designed as springs in the present case, are arranged on this rotary table 50. Together, these form a spring compensation 51. The spring compensation 51 limits a rotary movement of rotary plate 50 and presses the rotary plate 50 into the neutral position shown here.
[0078] FIG. 2 shows a perspective view of the cutting device 1 from FIG. 1. In the illustration according to FIG. 2, the drive devices 41 and 42 of the respective mandrels 20 and 40 can be seen. In the present case, the two drive devices 41 and 21 are each designed as toothed wheels, which are moved via a central gear wheel driven by a motor. The mandrels 20 and 40 thus have a common drive device.
[0079] It can also be seen from FIG. 2 that a pneumatic cylinder is provided for moving the stripping device 22 and the stripping device 42. However, these are not indicated in greater detail here.
[0080] FIG. 3 shows a schematic view of a knife/mandrel combination consisting of a knife 30 which is mounted rotatably about an axis of rotation M and consisting of a first mandrel 20 which is mounted rotatably about an axis of rotation Dl. The knife 30 is mounted pivotably about the point P on a pivotable bracket (not shown here). By pivoting the knife 30 about the point P, the axis of rotation M can be advanced to the axis of rotation D1 of the mandrel 20. A fiber-based shell located on the mandrel 20 is thus clamped between the knife 30 and the mandrel 20. This fiber-based shell can be separated by rotating the mandrel 20.
[0081] FIG. 4 shows a schematic view of a further knife/mandrel combination consisting of a knife 30, a first mandrel 20 and a second mandrel 40. This illustration substantially corresponds to the functional principle of the cutting device 1 from FIG. 1. The knife 30 is arranged on a carriage 31 (see FIG. 1), not shown here, and is linearly displaceable along the arrow direction P2. The carriage 31 is mounted on a rotary table 50 (see FIG. 1) rotatably about the point P and pivotably in the arrow direction P3. By moving the knife 30 in the arrow direction P2 towards the mandrels 20 and 40, the knife 30 is automatically centered between the two mandrels 20 and 40. In other words, a distance between the axis of rotation D1 and the axis of rotation M corresponds to a distance between the axis of rotation D2 and the axis of rotation M.
[0082] FIGS. 5 to 10 show a fabrication process. The fabrication process is explained in connection with the first mandrel 20. However, the method steps are used in exactly the same way on the second mandrel 40. In a first step, which can be seen in FIG. 5, a fiber-based shell 10 is provided relative to a first mandrel 20. The stripping device 22 can be seen on the first mandrel 20. In a second step, which can be seen in FIG. 6, the fiber-based shell 10 is positioned on the mandrel 20 in the receiving direction A. In the next step, which can be seen in FIG. 7, a knife 30, as described in FIGS. 3 and 4, is advanced towards the axis of rotation D1 with its axis of rotation M in such a way that the fiber-based shell 10 is clamped between the knife 30 and the mandrel 20. The mandrel 20 is then rotated together with the fiber-based shell 10 arranged thereon. This rotation also drives the knife 30, which rotates about its axis of rotation M. As a result of this rotation and uniform pressure of the knife 30 on the fiber-based shell 10, a part 11 of the fiber-based shell 10 is cut off from the latter. The now fabricated fiber-based shell 10′ is subsequently removed from the mandrel 20 counter to the receiving direction A (see FIG. 6), and only the cut-off part 11 remains on the mandrel 20, as can be seen in FIG. 8. In the subsequent step illustrated in FIG. 9, the stripping device 22 is moved counter to the receiving direction A, which is illustrated by the arrow in FIG. 9. Due to this movement, the cut-off part 11 is stripped off the mandrel 20. As soon as the cut-off part 11 is detached from the mandrel 20, air is blown into the fan nozzle 60 and the part 11 is blown out of the working area with this air blast. Next, the stripping device 22 is moved back into the original position according to FIG. 5. The method described here naturally also applies to a second mandrel.
[0083] FIG. 11 shows a plan view of a fabricating table 5. The fabricating table 5 has a cutting device 1, wherein this cutting device 1 has two mandrels. A plurality of fiber-based shells 10 is located on a conveyor 70, not shown in greater detail here. These fiber-based shells 10 are transferred from the conveyor 70 to a rotary plate 90 which moves them towards the cutting device 1. In the cutting device 1, the fiber-based shells 10 are fabricated as described in the present case. The finished fiber-based shells 10′ are moved further with the rotary plate 90 to a conveyor 80 (not shown in more detail) and delivered to it.
[0084] FIG. 12 shows a perspective view of a fabricating table 5. The fabricating table 5 has a cutting device 1, wherein this cutting device 1 has two mandrels. A plurality of fiber-based shells is conveyed with a conveyor 70 to a rotary plate 90 and transferred. The rotary plate in turn conveys them towards the cutting device. In the cutting device 1, the fiber-based shells are fabricated as described above. The finished fiber-based shells are moved further with the rotary plate 90 to a conveyor 80 and delivered to it.
[0085] FIG. 13 shows a detailed view of the fabricating table 5 from FIG. 12. In this illustration, two fiber-based shells 10 can be seen, which are held by the rotary plate 90 and are applied to the mandrels (not visible here). The fiber-based shells 10 are fed via the conveyor 70 to the fabricating table 5. The illustration is shown here shortly before the knife 30 of the cutting device 1 is advanced towards the mandrels. One of several fabricated fiber-based shells 10′ is shown in the right-hand region of the image. These are removed from the fabricating table 5 via the conveyor 80.
