Strip cutting machine and method for manufacturing knife shafts
Manufacturing knife shafts as a single solid body with integral circular knives addresses tolerance and hygiene issues in strip cutting machines, simplifying production and improving cleanliness for narrow strip cutting.
Patent Information
- Application Number
- DE102022103230
- Authority / Receiving Office
- DE · DE
- Patent Type
- Patents
- Current Assignee / Owner
- Filing Date
- 2022-02-11
- Publication Date
- 2024-12-24
- Estimated Expiration
- 2042-02-11
AI Technical Summary
Existing strip cutting machines face issues with significant tolerance effects and hygiene problems, particularly when cutting narrow strips, due to the use of multiple parts and gaps between knife shafts, leading to complex production processes and germ accumulation.
The knife shafts are manufactured as a single, solid body with integral circular knives, eliminating the need for individual parts and ensuring consistent knife distances by measuring from a defined zero point, thereby reducing tolerances and preventing residue accumulation.
This approach simplifies production, reduces tolerance effects, and enhances hygiene by eliminating gaps where residues accumulate, making it suitable for cutting narrow strips effectively and maintaining cleanliness.
Smart Images
Figure 00000000_0000_ABST
Abstract
Description
[0001] The invention relates to an electrically operated strip cutting machine for cutting strips from disc-shaped material to be cut, preferably foodstuffs, with at least one drive motor and a cutting set which is arranged in an exchangeable manner in the strip cutting machine and which comprises two knife shafts which are driven in simultaneous rotation by the drive motor, wherein the knife shafts are positioned axially parallel to one another during operation and each carry an equal number of several disc-shaped circular knives, wherein the circular knives are arranged on the knife shafts with the same axial offset from one another in such a way that each circular knife of the first knife shaft is opposite a corresponding circular knife of the second knife shaft in pairs with a slight axial offset, so that the circular knives of the opposite pairs ideally pass each other with a distance of zero during operation,and wherein the circular blades of the first blade shaft are arranged thereon with an equal axial offset relative to the corresponding opposing circular blades of the second blade shaft. Furthermore, the invention relates to a manufacturing method for this strip-cutting machine.
[0002] A strip cutting machine with the feature complexes defined above is known from DE 10 2006 025 615 B3 of the applicant.
[0003] The term strip cutter refers to a device through which sausage slices are fed, usually as raw material for the production of sausage salad or meat salad. The fed sausage slices are cut into longitudinal strips by the strip cutter. There are various models for different strip widths, for example, in the range of 2 mm to 20 mm. The strip cutter usually has an interchangeable cutting set. With such a cutting set, a defined width of strips can be cut. Known state-of-the-art strip cutters cut strips with widths of 4, 6, 8, 12, 16, or 20 mm, for example. The length of the knife shaft can be 180 mm, for example.
[0004] A cutting set of such a strip cutter comprises two knife shafts with several parallel knife discs, spaced appropriately apart to achieve the desired strip width. The sausage slice is cut at the point where the corresponding knives of the opposing knife shafts touch.
[0005] The property "opposite" here means that the circular blades lie axially side by side in their radial overlap area. Strictly speaking, "opposite" would otherwise mean that the circular blades butt against each other with their cutting edges, which is not the case with a strip cutter. The circular blades of the opposing pairs do not normally touch each other. Rather, the aim is for two pairs of blades to pass very closely together and actually do not touch, or only touch very lightly. In individual cases, however, it can happen that the blades do touch slightly with their facing sides or at their cutting edges, so that the two blades rub against each other slightly. Ideally, however, the distance between the two cutting edges of two opposing blades should be zero, as is the case with scissors.This means that when the strip cutter is in operation, the desired strips can be cut, in the sense of sheared, from the supplied sausage slice.
[0006] For example, DE 10 2006 025 615 B3 states: "The circular knives 20' and 22' of a knife-counter knife pair overlap in an overlap area 122. In this overlap area 122, a flank 124 of the circular knife 20' and a flank 126 of the circular knife 22' lie opposite each other. The flanks 124 and 126 lie outside the respective bevels 118 and 120. The circular knives 20', 22' have a width (in the direction 116) which is smaller than the width of a space 92 between adjacent webs 88 or 88 and 112 or 88 and 114. The distance between adjacent circular knives 20' or adjacent circular knives 22' corresponds to the sum of the width of the space 92 and the width of a web 88. The circular knives 20' of the first circular knife shaft 16 are to the circular knives 22' of the second circular knife shaft 18 in the direction 116 offset by the width of one circular knife."
[0007] In the current state of the art, the knife shafts of the strip cutter always consist only of the respective shaft itself, onto which a circular knife disc and a spacer (washer, flat washer, intermediate disc, etc.) are alternately mounted. This ensures that the circular knives are mounted on the knife shaft at the desired, defined distance from each other. Since both the thickness of the circular knives near the knife shaft and the thickness of the spacers are subject to tolerances, in the worst case, these tolerances accumulate across several circular knives, so that in practice the circular knives of the two opposing knife shafts no longer fit together precisely (i.e., with an ideal distance of zero).
[0008] This effect is further aggravated by the fact that the circular knives and the shims rest against each other with an indeterminate, not really adjustable, pressure, and thus also subject to tolerances. To compensate for this, there are very thin (usually only a few tenths of a millimeter thick) shims / washers that can be manually applied to the knife shaft at various points to adjust the distances accordingly. This way, the two opposing knife shafts are always precisely aligned with each other in terms of the relative spatial position of their individual circular knives. However, all of this requires a very complex production process that demands a great deal of experience and patience from the employees carrying out the work.
[0009] The damaging tolerance effect is even greater and significantly more difficult to compensate for when the width of the strips to be cut, and thus the distance between two circular blades on a shaft, becomes relatively small. Therefore, in practice, only strip cutters for strips 4 mm or wider are actually manufactured and offered. Strip cutters for narrower strips would be extremely difficult or even impossible to implement given the current state of technology.
[0010] Although DE 10 2006 025 615 B3 of the applicant cited at the beginning even shows a theoretical possibility of how strips with a width of less than 4 mm can be cut, the document unfortunately does not address the tolerance problems discussed above, but only a separate, completely different problem (namely the aspect of a special comb device), so that the aforementioned high manufacturing effort to eliminate the tolerance problems still remains even with this state of the art.
[0011] Furthermore, the strip-cutting machines known from the current state of the art also have a hygienic disadvantage: The numerous joints where the circular blades and washers meet are particularly susceptible to the formation of germs due to the small and tiny remaining cutting residues. This is particularly detrimental in the food industry.
[0012] The object of the present invention is, in contrast, to modify a strip cutting machine of the type defined at the outset and a corresponding manufacturing method in such a way that the disadvantages of the prior art discussed above are avoided, wherein in particular the harmful tolerance effects are minimized, the manufacturing is made considerably simpler and less complex, and the hygiene properties during operation of the strip cutting machine are also significantly improved.
[0013] This technically quite demanding task is solved in a particularly simple, cost-effective, and surprisingly effective way with regard to the device by a strip-cutting machine of this type, which is characterized by the fact that the circular blades of the first blade shaft are integrally connected to the first blade shaft, and the circular blades of the second blade shaft are integrally connected to the second blade shaft, with the circular blades and their associated blade shaft each being manufactured from an elongated solid body. This also immediately demonstrates the inventive solution with regard to the manufacturing process.
[0014] A "one-piece blade shaft" as such is already known in the prior art, for example in document shredders, as described in DE 39 41 984 A1. There, the document shredder does indeed feature a one-piece blade shaft. However, this technical field is so far removed from strip cutters for food that any possible conceptual logical approach to using one-piece blade shafts fitted with circular blades in food processing systems can be ruled out.
[0015] It is precisely for this reason that the proposal according to the present invention, which is quite easy to implement in practice, has apparently not yet occurred to those skilled in the relevant technical field, despite the effective solutions to problems which it can easily achieve in an effective manner and which must undoubtedly have been desirable for a long time.
[0016] The core of this inventive idea is to produce the knife shaft with all its many knives from a single body - usually by turning - instead of equipping the shaft with individual knives as was previously the case. This has the particular advantage that the tolerance effects with regard to the knife spacing no longer add up. When turning each individual recess that forms one side of a knife, measurements are now always taken from the same starting point ("mechanical zero point"). This zero point is, for example, a defined point on the shaft axis, such as the point at which the shaft will later be attached to a holder. However, the beginning of the shaft can also simply be chosen as the zero point, for example where the shaft coupling is located, which is then connected to a drive.The distance of each individual blade from this zero point is known in principle, and the blade is rotated from this point to the desired distance. This means that the tolerances across the individual blades no longer add up, but are always the same—the tolerance of the rotation process. This is particularly advantageous for strip cutters for narrow strips, for example, strips of 4 mm or less, especially 2 mm or 3 mm, since the tolerance effects for these narrow strip widths add up particularly strongly in conventional manufacturing.
[0017] The elimination of the multitude of individual parts and narrow gaps in between also prevents the accumulation of organic cutting residues in these gaps in the case of a single-piece knife shaft, as opposed to a multi-part knife shaft according to the state of the art, and thus considerably increases the hygienic cleanliness during operation of the strip cutting machine according to the invention.
[0018] A first, particularly easy-to-manufacture embodiment of the invention is characterized in that the knife shafts with their associated circular knives are each manufactured by turning blanks from a solid body. Turning has long been a common standard process, and lathes for machining particularly elongated metal blanks can be found practically everywhere in the world.
[0019] A further development of this strip-cutting machine is characterized by the fact that the blanks of the knife shafts, produced by turning from a solid body, with their associated circular knives are each post-machined by milling, grinding, and / or drilling. This allows for the easy repair or removal of defects or burrs on the workpiece that can occasionally occur during turning.
[0020] In further advantageous embodiments of the invention, the strip-cutting machine comprises a holder in which the cutting set is mounted such that the two blade shafts—usually independently of each other—can be driven in rotation simultaneously by the drive motor. This holder, together with a cutting set, each comprising a pair of blade shafts manufactured in one piece with the circular blades according to the invention, forms a replaceable or interchangeable insert for use in a strip-cutting machine according to the invention.
[0021] A particularly important class of developments of the above-mentioned embodiments in practice is characterized in that the two knife shafts of the cutting set each have a coupling device at a free end, by means of which they are rotatably mounted in the holder, preferably mechanically movably connectable to the drive motor, and that the knife shafts each have a bearing device at the other free end axially opposite the coupling device, with which they are mounted in the holder at this other free end.
[0022] The term "coupling device" should be understood here simply as a detachable connection to a drive unit, i.e. to a rotating counterpart / drive that is connected to a drive motor. Each knife shaft according to the invention has such a coupling unit on one of its sides, which is driven during operation by the drive motor (usually via a gearbox) when the cutting set is installed in the strip cutting machine. Each knife shaft is rotatably mounted in the holder at both ends. On the side of the coupling device, the bearing is, so to speak, the rear part of the coupling. In other words, the thicker part of the knife shaft simply rotates in a corresponding recess in the holder. On the opposite side, the knife shaft simply ends as an axle. This engages with a bearing that is attached to the holder.
[0023] An advantageous variant of this development is characterized by the coupling devices and the bearing devices being integrally connected to the blade shafts, in that they and their associated blade shafts are each manufactured from a single solid body. This variant is particularly compact and eliminates the need for additional individual parts and the "dirt gaps" that inevitably occur after their installation on the shaft.
[0024] Alternatively or additionally, in variants of this class of further developments, the coupling devices have sections that protrude radially from their respective associated knife shafts, with gaps extending radially toward the associated knife shaft, into which rotatable coupling elements extending toward the drive motor can engage in a force-locking manner. By mechanically engaging these gaps, the coupling elements can be connected to the coupling devices particularly easily.
[0025] In a further, particularly preferred variant, the holder is constructed from two halves that can be fastened to one another, preferably hooked into one another, with each of these halves supporting one of the knife shafts, and with both halves together forming an interchangeable insert with a selected cutting set. This two-part design of the holder enables particularly simple assembly of the pair of opposing knife shafts. The two holder halves are then simply joined together and inserted into the strip-cutting machine according to the invention as needed.
[0026] Another advantageous variant is one in which the bearing devices are designed as hubs for rotatable engagement in corresponding round recesses in the holder, each acting as a counterbearing. This extremely simple design of the bearing, which is always required when the knife shafts rotate in the holder, has proven itself in practice. The bearing devices of the knife shafts or the hubs can also be surrounded by a ball or roller bearing, which in turn is inserted into the recesses in the holder.
[0027] In a further preferred embodiment of the strip-cutting machine according to the invention, the cutting set has two stripping devices, the first stripping device being assigned to the first knife shaft with the circular knives, and the second stripping device being assigned to the second knife shaft with the circular knives. The stripping devices have self-contained, grid-like slots into which the respective circular knife can engage like a comb. With the help of these stripping devices, the product strips created during operation of the strip-cutting machine—such as sausage or cheese strips—can be effortlessly and automatically stripped from the knife shafts. They then fall, for example, into a collecting container located below the cutting set and are collected there.This embodiment can be advantageously further developed by manufacturing the stripping devices from a sheet metal by laser cutting and / or wire-cutting the slots, and optionally by suitable partial bending of the sheet metal. This allows for particularly simple and cost-effective production of the stripping devices. Furthermore, the stripping devices can each have a plurality of preferably parallel, self-contained slots on their flat base body, which primarily serve to reduce weight while maintaining mechanical stability.
[0028] The scope of the present invention also includes a cutting set with two knife shafts for installation in a strip cutting machine of the type according to the invention, which is characterized in that the circular knives of the first knife shaft of the cutting set are connected in one piece with the first knife shaft and the circular knives of the second knife shaft of the cutting set are connected in one piece with the second knife shaft, in that the circular knives and their associated knife shaft are each made from an elongated solid body.
[0029] Furthermore, the present invention also includes a method for producing the knife shafts of a cutting set according to the invention of the above type with their associated circular knives for later installation in a strip cutting machine designed according to the invention, which method is characterized by the following steps: a.Clamping an elongated, preferably cylindrical solid metal body onto a lathe; b.Turning of radial recesses into the solid body at equal axial distances from each other in the form of circumferential grooves of equal depth and width, so that equidistant, radially projecting disc-shaped elevations remain in the solid body; c.Grinding the disc-shaped elevations at their outermost radial ends, preferably from one side of the elevation in each case, in such a way that the elevations become circular knives.
[0030] According to the invention, this method is characterized in that, during the rotation of each individual radial recess to be produced, its respective axial position along the axis of the elongated solid body is always measured from a identical, defined starting point on the solid body. The defined starting point is preferably a predetermined point at a free end of the elongated solid body, in particular a point at which the knife shaft produced by the method is later connected to a holder or coupling elements for the drive motor during operation of the strip-cutting machine. This allows the detrimental tolerance effects discussed above to be reduced to the minimum conceivable residual value.
[0031] Further features and advantages of the invention will become apparent from the following detailed description of exemplary embodiments of the invention with reference to the figures of the drawing, which illustrate details essential to the invention, as well as from the claims. The individual features can be implemented individually or in combinations in variants of the invention.
[0032] The schematic drawing shows embodiments of the invention, which are explained in more detail in the following description.
[0033] They show: Fig. 1 a schematic vertical section through a strip cutting machine according to the invention with a cutting set with two one-piece knife shafts; Fig. 2 a schematic vertical section through a multi-part knife shaft with numerous individual knife discs and spacers for a strip cutting machine according to the prior art; Fig. 3a a schematic side view of a one-piece knife shaft according to the invention with integrated circular knives; Fig. 3b a complete cutting set according to the invention with a one-piece knife shaft according to Fig. 3a and its one-piece counterpart; Fig. 4 an enlarged section of a schematic vertical section through a central part of a cutting set according to the invention with two opposing one-piece knife shafts intermeshing in the cutting area; Fig. 5a a spatial view obliquely from above of a holder with an embodiment of the cutting set according to the invention; Fig. 5b the embodiment of Fig. 5a with oblique view from the side; Fig. 6a a spatial view obliquely from the side of one half of the arrangement according to Fig. 5a with a holder half, a stripping device, a one-piece knife shaft and with a bearing element between the bearing device of the knife shaft and a recess in the holder half; Fig. 6b the holder half of Fig. 6a without the bearing element in the recess between the knife shaft and the holder; Fig. 7 the design of the holder half of Fig. 6a with stripping device, but without knife shaft; Fig. 8a the design of the holder half of Fig. 6a without knife shaft and stripping device, but with the bearing element in the recess of the holder half; Fig. 8b the holder half of Fig. 6b without knife shaft and without bearing element; and Fig. 9 a schematic spatial view of an embodiment of the stripping device.
[0034] Fig. 1 shows a schematic vertical section of an electrically operated strip cutting machine 10 for cutting strips from disc-shaped material to be cut, preferably foodstuffs, with at least one drive motor (not specifically shown in the drawing) and a cutting set 11 which is arranged so as to be replaceable in the strip cutting machine 10. This cutting set comprises two knife shafts 12a; 12b which are driven in simultaneous rotation by the drive motor and which, during operation, are positioned axially parallel to one another and each carry an equal number of several disc-shaped circular knives 13a, 13a', 13a'', ...; 13b, 13b', 13b'', ... which are mounted on the knife shafts 12a; 12b are arranged such that each circular blade 13a, 13a', 13a'', ... of the first blade shaft 12a is each assigned to a corresponding circular blade 13b, 13b', 13b'', ...the second knife shaft 12b in pairs with a slight axial offset, so that the circular knives 13a, 13a', 13a'', ...; 13b, 13b', 13b'', ... of the opposite pairs ideally pass each other at a distance of zero during operation, wherein the circular knives 13a, 13a', 13a'', ... of the first knife shaft 12a are arranged thereon with a respective equal axial offset with respect to the corresponding opposite circular knives 13b, 13b', 13b'', ... of the second knife shaft 12b.
[0035] In Fig. Figure 2 is a schematic vertical section through a conventional, state-of-the-art knife shaft for a strip-cutting machine, fitted with many individual parts. Lined up on the knife shaft are the knife disks of the individual circular knives and the spacers in between. These are intended to ensure that the knife disks, when assembled, maintain a distance defined within tolerances from one another. On the left side of the image, you can see how the knife disks and the spacers (usually washers) are alternately lined up close together on the knife shaft. To achieve this, the parts must be pushed from right to left during production until they are flush, as indicated in the right half of the image, until the shaft is completely fitted with correctly spaced knife disks.
[0036] In contrast, Fig. 3a shows a schematic side view of an embodiment of the knife shaft 12a designed according to the invention: Here, the circular knives 13a, 13a', 13a'', ... of the first knife shaft 12a are integrated in the first knife shaft 12a and connected to it in one piece.
[0037] Fig. 3b then shows a complete cutting set 11 according to the invention with the first one-piece knife shaft 12a according to Fig. 3a and with its—likewise one-piece—counterpart, the second knife shaft 12b. The two knife shafts 12a; 12b of the cutting set 11 each have a coupling device 15a'; 15b' at one free end, by means of which they can be rotatably mounted, preferably mechanically movably connected to the drive motor. Furthermore, the knife shafts 12a; 12b each have a bearing device 15a''; 15b'' at the other free end axially opposite the coupling device 15a'; 15b', by means of which they can also be mounted at this other free end.
[0038] In the embodiment shown, the coupling devices 15a'; 15b' and the bearing devices 15a''; 15b'' are each connected in one piece to the knife shafts 12a; 12b in that they and their associated knife shaft 12a; 12b are each made from a solid body.
[0039] Furthermore, the coupling devices 15a'; 15b' have partial regions projecting radially from their respective associated knife shaft 12a; 12b with gaps 16a'; 16b' extending in the radial direction to the associated knife shaft 12a; 12b, into which rotatable coupling elements extending to the drive motor can engage in a force-locking manner.
[0040] In Fig. Figure 4 shows an enlarged detail in schematic vertical section of a central portion of a cutting set 11 according to the invention, comprising two opposing, one-piece blade shafts 12a; 12b that mesh with each other in the cutting area with their disc-shaped circular blades 13a, 13a', 13a'', ...; 13b, 13b', 13b'', ... in a manner of speaking, scissor-like. It can be seen that the opposing blade pairs do not touch in their radial overlap area, but lie very closely against each other axially with respect to the blade shafts 12a; 12b, so to speak, with an "ideal distance of zero." In this way, an optimal cutting result can be achieved during operation of the strip cutting machine 10.
[0041] The Fig. 5a and Fig. 5b each show a spatial view of the same embodiment of the cutting set 11 according to the invention, installed in a holder 14, namely Fig. 5a with view from diagonally above and Fig. 5b, obliquely from the side. The two knife shafts 12a; 12b are mounted in this holder 14 in such a way that they can be driven by a drive motor and then rotate simultaneously.
[0042] The coupling devices 15a'; 15b' serve to provide a rotationally fixed connection to the drive. At the same time, the cylindrical shape on the inner side serves as a bearing in the holder 14. A ball bearing or similar device is not required here.
[0043] The holder 14 is constructed from two holder halves 14a; 14b, which are fastened to one another and, in the present embodiment, can be hung into one another. Each of these halves 14a; 14b carries one of the knife shafts 12a; 12b, and both halves 14a; 14b together form an interchangeable insert with a selected cutting set 11. The cutting set 11 has two stripping devices 18a; 18b, of which the first stripping device 18a is assigned to the first knife shaft 12a with the circular knives 13a, 13a', 13a'', ..., and the second stripping device 18b is assigned to the second knife shaft 12b with the circular knives 13b, 13b', 13b'', ...
[0044] For better visibility of the “innards” in the Fig. 6a and Fig. 6b only one holder half 14b of the arrangement according to Fig. 5a. A knife shaft 12b is shown, installed in the holder half 14b, with its integrally projecting circular knives, as well as the coupling device 15b' on the right side and the axially opposite bearing device 15b'' at the left free end of the shaft. The bearing device 15b'' is designed as a hub for rotatable engagement in a corresponding round recess 17b'' in the holder half 14b, each acting as a counterbearing.
[0045] In the embodiment of Fig. 6a, a bearing element 20, such as a ball or roller bearing, installed in the recess 17b'' surrounds the bearing device 15b'' and thus represents a mechanical rotary connection between the knife shaft 12b and the holder half 14b. The illustrated insert half is thus completely assembled and functional. In the illustration in Fig. In Figure 6b, however, the bearing element 20 is not yet installed in order to more clearly show the bearing device 15b'' and the recess 17b''. The unit would therefore not yet be operational in this form.
[0046] To make some details even more visible, Fig. 7 the embodiment of the holder half 14b of Fig. 6a with the stripping device 18b and the bearing element 20, but without the blade shaft. It can be clearly seen here that the stripping device 18b has slots 19b, 19b', 19b'', ... into which the associated circular blades 13b, 13b', 13b'', ... can engage in a comb-like manner. These slots 19b, 19b', 19b'', ... are closed in the illustrated embodiment.
[0047] The spatial representation of Fig. 8a shows the embodiment of the holder half 14b according to Fig. 6a without knife shaft and stripping device, but with the bearing element 20 in the left recess of the holder half 14b. When mounting a knife shaft 12b into the holder half 14b, the hub-shaped bearing device 15b'' is then inserted into the inner opening of the bearing element 20.
[0048] The spatial representation of Fig. 8b shows the embodiment of the holder half 14b according to Fig. 6b “pure” without knife shaft 12b, without scraper device 18b and also without a bearing element 20 in the left recess 17b''.
[0049] Fig. Finally, Fig. 9 shows an embodiment of the stripping device 18a again “pure” with the slots 19a, 19a', 19a'', ....
[0050] The stripping devices 18a; 18b can each be manufactured from a sheet metal by laser cutting and / or wire-cutting the slots 19a, 19a', 19a'', ...; 19b, 19b', 19b'', ... and, if necessary, by suitable partial bending of the sheet metal. The sheet metal processed in this way can then be suspended in a holder half 14a; 14b. For example, for cleaning purposes or for other reasons, the stripping device 18a; 18b can be easily removed from the holder half 14a; 14b after its installation in the holder half 14a; 14b and after a certain period of operation in the strip-cutting machine 10. Reference list 10 strip cutting machine 11 Cutting set 12a; 12b knife shafts 13a, 13a', 13a'', ...; 13b, 13b', 13b'', ... circular knives 14 holders 14a; 14b Holder halves 15a'; 15b' coupling devices 15a''; 15b'' Storage facilities 16a'; 16b' column 17b'' recess 18a; 18b scraper devices 19a, 19a', 19a'', ...; 19b, 19b', 19b'', ... slots 20 bearing element
Claims
[1] Electrically operated strip cutting machine (10) for cutting strips from disc-shaped material to be cut, namely foodstuffs, with at least one drive motor and a cutting set (11) which is arranged replaceably in the strip cutting machine (10) and which comprises two knife shafts (12a; 12b) which are driven in simultaneous rotation by the drive motor, wherein the knife shafts (12a; 12b) are positioned axially parallel to one another during operation and each carry an equal number of several disc-shaped circular knives (13a, 13a', 13a'', ...; 13b, 13b', 13b'', ...), wherein the circular knives (13a, 13a', 13a'', ...; 13b, 13b', 13b'', ...) are arranged on the knife shafts (12a; 12b) with the same axial offset from one another in such a way that each circular knife (13a, 13a', 13a'', ...) of the first knife shaft (12a) each have a corresponding circular knife (13b, 13b', 13b'', ...) of the second knife shaft (12b) in pairs with a slight axial offset, so that the circular knives (13a, 13a', 13a'', ...; 13b, 13b', 13b'', ...) of the opposing knife-counter knife pairs ideally pass each other at a distance of zero during operation, wherein the circular knives (13a, 13a', 13a'', ...) of the first knife shaft (12a) are arranged thereon with a respective identical axial offset with respect to the corresponding opposing circular knives (13b, 13b', 13b'', ...) of the second knife shaft (12b), wherein each knife-counter knife pair has a respective identical, non-zero axial offset with respect to the two adjacent knife-counter knife pairs, wherein all circular knives (13a, 13a', 13a'', ...; 13b, 13b', 13b'', ...) have a bevel on the outer edge of their respective free end, which is formed by a plane which is oblique to a direction parallel to the knife shafts (12a; 12b), and wherein the planes of the bevel are arranged parallel to one another in all circular knives (13a, 13a', 13a'', ...; 13b, 13b', 13b'', ...). characterized by , that the circular knives (13a, 13a', 13a'', ...) of the first knife shaft (12a) are connected in one piece with the first knife shaft (12a) and the circular knives (13b, 13b', 13b'', ...) of the second knife shaft (12b) are connected in one piece with the second knife shaft (12b), in that the circular knives (13a, 13a', 13a'', ...; 13b, 13b', 13b'', ...) and their associated knife shaft (12a; 12b) are each made of an elongated solid body, and that the ground free ends of the circular knives (13a, 13a', 13a'', ...; 13b, 13b', 13b'', ...) of each knife-counter-knife pair have a radial overlap area perpendicular to a direction parallel to the knife shafts (12a; 12b), which is more than twice as large as the radial extent of the plane of a respective grind in a direction perpendicular to the parallel longitudinal axes of the knife shafts (12a; 12b). [2] Strip cutting machine (10) according to claim 1, characterized by that the knife shafts (12a; 12b) with their associated circular knives (13a, 13a', 13a'', ...; 13b, 13b', 13b'', ...) are each manufactured by turning blanks from a solid body. [3] Strip cutting machine (10) according to claim 2, characterized bythat the blanks of the knife shafts (12a; 12b) with their associated circular knives (13a, 13a', 13a'', ...; 13b, 13b', 13b'', ...) produced by turning from a solid body are each reworked by milling and / or grinding and / or drilling. [4] Strip cutting machine (10) according to one of the preceding claims, characterized by that the strip cutting machine (10) has a holder (14) in which the cutting set (11) is mounted in such a way that the two knife shafts (12a; 12b) can be driven in rotation simultaneously by the drive motor. [5] Strip cutting machine (10) according to claim 4, characterized bythat the two knife shafts (12a; 12b) of the cutting set (11) each have a coupling device (15a'; 15b') at a free end, by means of which they are rotatably mounted in the holder (14) and can be mechanically movably connected to the drive motor, and that the knife shafts (12a; 12b) each have a bearing device (15a''; 15b'') at the other free end axially opposite the coupling device (15a'; 15b'), by means of which they are mounted in the holder (14) at this other free end. [6] Strip cutting machine (10) according to claim 5, characterized by that the coupling devices (15a'; 15b') and the bearing devices (15a''; 15b'') are each connected in one piece to the knife shafts (12a; 12b) in that they and their associated knife shaft (12a; 12b) are each made from a solid body. [7] Strip cutting machine (10) according to one of claims 5 or 6, characterized bythat the coupling devices (15a'; 15b') have partial regions projecting radially from their respective associated knife shaft (12a; 12b) with gaps (16a'; 16b') extending in the radial direction to the associated knife shaft (12a; 12b), into which rotatable coupling elements extending to the drive motor can engage in a force-locking manner. [8] Strip cutting machine (10) according to one of claims 5 to 7, characterized by in that the holder (14) is constructed from two halves (14a; 14b) which can be fastened to one another, namely hooked into one another, each of these halves (14a; 14b) carrying one of the knife shafts (12a; 12b), and both halves (14a; 14b) together form an exchangeable insert with a selected cutting set (11). [9] Strip cutting machine (10) according to one of claims 5 to 8, characterized bythat the bearing devices (15a''; 15b'') are designed as hubs for rotatable engagement in corresponding round recesses (17b'') in the holder (14), each acting as a counter bearing. [10] Strip cutting machine (10) according to one of the preceding claims, characterized by in that the cutting set (11) has two stripping devices (18a; 18b), the first stripping device (18a) being assigned to the first knife shaft (12a) with the circular knives (13a, 13a', 13a'', ...) and the second stripping device (18b) being assigned to the second knife shaft (12b) with the circular knives (13b, 13b', 13b'', ...), and in that the stripping devices (18a; 18b) have, preferably self-contained, slots (19a, 19a', 19a'', ...; 19b, 19b', 19b'', ...) into which the respectively assigned circular knife (13a, 13a', 13a'', ...; 13b, 13b', 13b'', ...) can engage. [11] Strip cutting machine (10) according to claim 10, characterized bythat the stripping devices (18a; 18b) are each produced from a sheet metal by laser cutting and / or wire erosion of the slots (19a, 19a', 19a'', ...; 19b, 19b', 19b'', ...) and, if appropriate, a suitable partial bending of the sheet metal. [12] Method for producing the knife shafts (12a; 12b) of a cutting set (11) with two knife shafts (12a; 12b) with their associated circular knives (13a, 13a', 13a'', ...; 13b, 13b', 13b'', ...) for later installation in a strip cutting machine (10) according to one of claims 3 to 11, characterized by following steps: a. Clamping an elongated, preferably cylindrical, solid metal body onto a lathe; b. Turning of radial recesses into the solid body at equal axial distances from each other in the form of circumferential grooves of equal depth and width, so that equidistant, radially projecting disc-shaped elevations remain in the solid body; c. Grinding the disc-shaped elevations at their outermost radial ends, each from one side of the elevation, in such a way that circular knives (13a, 13a', 13a'', ... or 13b, 13b', 13b'', ...) are created from the elevations; wherein, when rotating each individual radial depression to be produced, its respective axial position along the axis of the elongated solid body is always measured from an identical, defined starting point on the solid body, and wherein the defined starting point is a predetermined point on a free end of the elongated solid body, to which the knife shaft (12a; 12b) created by the process is later connected to a holder (14) or to coupling elements for the drive motor during operation of the strip cutting machine (10).