Circular blade device

Abstract

The invention relates to a circular knife device (10) for cutting planar materials, in particular cardboard and / or textile materials, especially cover boards and / or covering panels, wherein the circular knife device (10) defines a cutting plane in which the planar materials are arranged and moved along a transport direction (14), with at least one circular knife (46) and an associated circular knife axis, wherein the circular knife (46) is rotatable about the circular knife axis, wherein the at least one circular knife (46) is displaceable parallel to the cutting plane and perpendicular to the transport direction (14), whereby a cutting width of the planar materials is variably adjustable, wherein the at least one circular knife (46) is pivotably mounted about a pivot axis (52) arranged substantially perpendicular to the cutting plane.so that cuts lying at an angle to the transport direction (14) and curved cuts of the planar materials can be carried out.

Description

[0001] The invention relates to a circular knife device for cutting planar materials, in particular cardboard and / or textile materials, especially cover boards and / or covering panels, wherein the circular knife device defines a cutting plane in which the planar materials are arranged and moved along a transport direction, with at least one circular knife and an associated circular knife axis, wherein the circular knife is rotatable about the circular knife axis, wherein the at least one circular knife is displaceable parallel to the cutting plane and perpendicular to the transport direction, whereby a cutting width of the planar materials is variably adjustable.

[0002] German patent application DE 102011002473 A1 discloses a circular knife device for cutting a flexible binding material in book cover manufacturing. The circular knife device has two circular knives that can be moved relative to each other in a cutting plane perpendicular to the transport direction of the binding material through the device. This allows the width of the binding material to be adjusted as it passes through the circular knife device.

[0003] European patent EP 2397339 B1 discloses a device for manufacturing book covers, wherein cover boards are covered with a covering blank to produce the book covers. To cut covering blanks of different sizes from supplied standard sizes of covering material, two circular blades adjustable perpendicular to the transport direction of the covering blanks are provided to trim the edges of the covering blanks to the set dimension.

[0004] European patent EP 1918122 B1 discloses a circular knife device for cutting the cover boards of books. The circular knives can be manually adjusted perpendicular to the transport direction of the cover boards.

[0005] German patent application DE 10 2017 215 712 A1 discloses a circular knife device for cutting sheet materials. The circular knife device defines a cutting plane in which the sheet materials are arranged and moved along a transport direction. The device comprises a circular knife and an associated circular knife axis, the circular knife being rotatable about the axis. The circular knife is mounted on a gantry and can be moved by means of the gantry parallel to the cutting plane and perpendicular to the transport direction. This allows for variable adjustment of the cutting width of the sheet materials. Furthermore, the circular knife is mounted on the gantry about a pivot axis arranged perpendicular to the cutting plane. This enables cuts to be made at an angle to the transport direction.

[0006] French patent application FR 2 888 768 discloses a circular knife device with two circular knives, wherein the two circular knives are rotatable about a circular knife axis and are displaceable parallel to the cutting plane and perpendicular to a transport direction. Additionally, the circular knives are pivotally mounted about a pivot axis arranged perpendicular to the cutting plane.

[0007] German patent application DE 100 27 886 A1 discloses a circular knife device with a circular knife rotatably mounted about a circular knife axis. The circular knife is arranged on a gantry and is displaceable parallel to the cutting plane and perpendicular to the transport direction. The circular knife is additionally pivotally mounted about a pivot axis arranged perpendicular to the cutting plane. The circular knife is intended for cutting compressible materials, such as wadding, to produce fabric parts for the manufacture of garments, sleeping bags, footwear, and the like.

[0008] The invention aims to improve the flexibility of a circular knife device when cutting flat materials with different dimensions.

[0009] According to the invention, a circular knife device with the features of claim 1 is provided for this purpose. Advantageous features and further developments of the invention are set forth in the dependent claims.

[0010] A circular knife device for cutting sheet materials, in particular cardboard and / or textile materials, especially cover boards and / or covering panels, defines a cutting plane in which the sheet materials are arranged and moved along a transport direction. The circular knife device has at least one circular knife and an associated circular knife axis, wherein the circular knife is rotatable about the circular knife axis. The at least one circular knife is displaceable parallel to the cutting plane and perpendicular to the transport direction, thereby allowing the cutting width of the sheet materials to be variably adjusted. Furthermore, the at least one circular knife is pivotally mounted about a pivot axis arranged substantially perpendicular to the cutting plane, so that cuts at an angle to the transport direction and curved cuts of the sheet materials can be performed.The circular knife device according to the invention can be used very flexibly because it can perform cuts at an angle to the transport direction and also curved cuts. In particular, a wide variety of cuts can be produced, so that, for example, only a standard format of a flat material needs to be fed in. This significantly simplifies warehousing. The setting of the at least one circular knife can be performed automatically and in sync with a clocked or non-clocked feed of the flat material and also depending on the transport speed of the flat material. The setting can therefore be made during operation, and batch sizes of, for example, even single units can be produced. Advantageously, the circular knife can be pivoted by an angle of ±30° to the transport direction, even during a cutting process.The pivoting circular blade can be rotated by means of a roller-like counter bearing or can be driven independently. A counter blade that pivots in the same direction can also be assigned to the pivoting circular blade.

[0011] In a further development of the invention, at least one circular blade is rotatably mounted on a pivoting element about the circular blade axis. The pivoting element is rotatably mounted on a linear guide element about the pivot axis, and the linear guide element is arranged to be displaceable along a linear guide parallel to the cutting plane. The circular blade can thus be simultaneously pivoted and displaced, enabling angled cuts, curved cuts, or even wavy cuts of the flat material. The circular blade device according to the invention is therefore extremely versatile.

[0012] In a further development of the invention, a first actuator, in particular a servo motor, is provided for pivoting the pivoting element about the pivot axis. This makes automatic pivoting of the circular blade possible, even during the operation of the circular blade device.

[0013] In a further development of the invention, a second actuator, in particular a servo motor, is provided for moving the linear guide element parallel to the cutting plane. In this way, the circular knife can be moved automatically perpendicular to the transport direction, even during operation of the circular knife device.

[0014] In a further development of the invention, a control unit is provided to adjust the pivot angle of the circular blade around its pivot axis, depending on the transport speed and / or the position of the planar materials relative to the circular blade. In this way, a pivoting movement of the circular blade around its pivot axis and a displacement movement of the circular blade perpendicular to the transport direction can be coordinated during the transport of planar materials through the circular blade device, enabling oblique and curved cuts of the planar materials. Specifically, the control unit and / or a computer program running on the control unit is provided and configured to adjust the position of the linear guide element relative to the linear guide, depending on the transport speed and / or the position of the planar materials relative to the circular blade.

[0015] According to the invention, at least one U-shaped or C-shaped bracket is provided, between whose legs the cutting plane is arranged and on which the at least one circular blade is arranged. A very stable arrangement of the circular blade or several circular blades can be ensured by means of U-shaped or C-shaped brackets, so that highly precise cuts are possible.

[0016] In a further development of the invention, two U-shaped or C-shaped brackets are provided, the open sides of which face each other. Flat materials can thus be transported between the arms of the brackets. The brackets offer a very stable mounting option for circular blades, counter bearings, counter blades, and / or rollers for guiding and moving the flat materials.

[0017] In a further development of the invention, two circular blades are arranged between the two brackets, with each circular blade rotatably mounted on one of the brackets. Such circular blades can be used in the case of book covers for cutting a spine reinforcement or a binding edge to the book covers.

[0018] In a further development of the invention, a third actuator is provided to adjust the distance between the two circular blades in the cutting plane relative to each other. Advantageously, a control unit is also provided to adjust the third actuator depending on the position and / or transport speed of the sheet materials. In this way, a cutting width can be set even during the operation of the circular blade device, and uninterrupted operation, even for batch size one, is possible. For example, the distance between the circular blades is adjusted before another cover board is fed into the circular blade device.

[0019] According to the invention, at least one bracket is slidably arranged on a machine frame and is displaceable relative to the machine frame perpendicular to the transport direction. This allows the circular knives, for example, to be rotatably mounted on the bracket but not displaceably. To adjust a cutting width or the width of the cover boards, the entire bracket can be moved relative to the machine frame and relative to the fed flat materials.

[0020] In a further development of the invention, a shredder or chipper is arranged downstream of the circular blade on the machine frame of the circular blade device. In this way, waste pieces cut from a flat material can be immediately cut into small pieces and disposed of.

[0021] Further features and advantages of the invention will become apparent from the claims and the following description of a preferred embodiment of the invention in conjunction with the drawings. The drawings show: Fig. 1 an isometric view of a circular knife device according to the invention from a front oblique angle, Fig. 2 two exemplary possibilities of cutting a flat piece of material with the circular knife device of the Fig. 1 to cut, Fig. 3 a front view of the circular knife device of the Fig.1 , Fig. 4 an enlarged detail of the circular knife device of the Fig.1 Fig. 5 shows a representation of the circular blades of the circular blade device according to the invention, wherein numerous elements of the circular blade device have been omitted for the sake of clarity; Fig. 6 shows the arrangement of the Fig. 5 from above.

[0022] Fig. 1 Figure 1 shows a circular knife device 10 according to the invention in a front oblique view. The circular knife device 10 can, for example, be part of a bookbinding machine (not shown), but it can also be designed as a separate unit, possibly even movable and capable of being coupled to another machine as needed.

[0023] The circular knife device 10 has a machine frame 12, which is designed as a square beam arranged transversely to a transport direction 14 through the circular knife device 10. As shown, the machine frame 12 can also be part of a machine frame of a bookbinding machine (not shown). The beam is hollow and extends from an electric motor 16, which is connected to a first, in Fig. 1 At the end of the support shown on the right, a drive shaft 18 extends through the entire support and is located, among other places, at the second end of the support, which is in Fig. 1 shown on the left, accessible. On the in Fig.1 At the visible end of the drive shaft 18, a drive wheel 20 is mounted, which drives several circular blades and a counter bearing for a circular blade via a toothed belt and several gears. Chains, gears alone, or other transmissions can, of course, be used instead of a toothed belt. Similarly, another drive wheel for a toothed belt is mounted at the concealed right end of the support 12.

[0024] The circular knife device 10 has two C-shaped brackets 22, 24, which are arranged with their open sides facing each other on the support of the machine frame 12. The two brackets 22, 24 are arranged with their parallel legs perpendicular to the transport direction 14. Between the two brackets 22, 24 are arranged two circular knives 26, 28, each of which is associated with a counter knife 30, 32, see also Fig. 3 The circular knives 26, 28 and the counter knives 30, 32 are each aligned parallel to the transport direction 14 and are designed to cut a central reinforcement or a border for a book cover from a fed cardboard blank. The circular knives 26, 28 are each arranged on a separate drive shaft, which is only partially driven by means of Fig. 1 The recognizable gearbox is driven by the electric motor 16. The counter blades 30, 32 are also each arranged on a separate drive shaft, which is driven by the electric motor 16. The circular blades 26, 28 and the counter blades 30, 32 are each driven such that a flat cut is conveyed through the circular blade assembly 10 in the transport direction during cutting. Driving the drive shafts by means of separate and coordinated electric motors is possible within the scope of the invention.

[0025] Between the thighs of the in Fig. 1 On the right-hand bracket 24, another circular blade 34 is arranged, to which a further counter blade 36 is assigned. The circular blade 34 is arranged on the same drive shaft as the circular blade 28, and the counter blade 36 is arranged on the same drive shaft as the counter blade 32. The circular blade 34 and the counter blade 36 are intended for trimming the side edge of a fed flat blank. The circular blade 34 and the counter blade 36 are both mounted on a carriage 38 that is movable transversely to the transport direction 14 and is attached to the Fig. 1 The upper leg of the bracket 24 is slidably mounted. A spindle drive with a threaded spindle 40, driven by an actuator 42, is provided for moving the carriage 38. This allows the width of a cover board cut from a supplied flat blank to be adjusted.

[0026] Furthermore, the bracket 24 is arranged to be displaceable on the support of the machine frame 12 perpendicular to the transport direction 14. For this purpose, the Fig. 1 lower legs of the stirrup 24 by means of a in Fig. 1 The linear guide, only partially shown, is attached to the carrier. A servo motor 44, which drives a threaded spindle, is provided for moving the bracket 24 relative to the carrier and thus perpendicular to the transport direction 14. By moving the bracket 24 perpendicular to the transport direction, a distance between the circular knife 28 and the circular knife 26, or between the counter knife 32 and the counter knife 30, can be adjusted. This allows the width of the back reinforcement or the edge to be set, which is cut from a supplied flat blank.

[0027] Between the thighs of the in Fig.1 A further circular blade 46 is arranged on the left bracket 22. A roller-like counter bearing 48 is associated with the circular blade 46. The counter bearing 48 can be designed as a steel roller. Alternatively, a counter blade can be provided instead of the counter bearing 48, which pivots in the same direction as the circular blade 46. The circular blade 46 and the counter bearing 48 form a crushing blade assembly with which a supplied flat blank can be cut. The counter bearing 48 is arranged on the same drive shaft as the counter blade 30 and is driven together with the counter blade 30 by the electric motor 16. Within the scope of the invention, it is possible to drive the counter bearing 48 by means of a separate electric motor.

[0028] The circular blade 46 is rotatably mounted about its circular blade axis on a pivoting element 50, which in turn is pivotally mounted about a pivoting axis 52 arranged perpendicular to the transport direction 14. By pivoting the circular blade 46 about the pivoting axis 50, it can be set either parallel or at an angle to the transport direction 14. This allows for cuts parallel to or at an angle to the transport direction 14. Curved cuts are also possible if the setting angle of the circular blade 46 is changed during a cutting process and a flat blank is moved in the transport direction 14. An actuator 54 is provided for setting the angular position of the pivoting element 50, and thus of the circular blade 46, about the pivoting axis 52. The pivoting element 50 is connected by means of a Fig. 1 only partially visible linear guide perpendicular to the transport direction and thus parallel to the one in Fig. 1 The upper leg of the bracket 22 is slidably arranged on the bracket 22. A threaded spindle 56 is provided for adjusting the pivoting element perpendicular to the transport direction 14, which is driven by an actuator 58. The linear guide is arranged directly behind the threaded spindle 56 and partially concealed by it. In the illustrated embodiment, the circular blade 46 is not driven, but is carried along by the counter bearing 48 and thus driven. Within the scope of the invention, it is possible to provide a separate drive motor for the circular blade 46. The circular blade 46 can be used to trim a side edge of a fed flat blank, as shown, either parallel to the transport direction 14, obliquely to the transport direction 14, or curved.

[0029] The bracket 22 is mounted on the support of the machine frame 12 and is displaceable perpendicular to the transport direction 14 by means of a linear guide 60. A servo motor 62, which drives a threaded spindle, is responsible for displacing the bracket 22 along the linear guide 60. By displacing the bracket 22 perpendicular to the transport direction 14, a distance between the circular knife 26 and the circular knife 28, or a distance between the counter knife 30 and the counter knife 32, can be adjusted. Thus, by displacing the bracket 22 perpendicular to the transport direction 14, the width of a back reinforcement or a hem cut from a supplied flat blank can be set.By moving both the frame 22 and the frame 24 perpendicular to the transport direction, the width of a back reinforcement or a border to be produced can be changed, whereas the width of the cover boards cut simultaneously remains unchanged. This is because the circular knives are rotatably mounted on the frames 22 and 24 and are moved together with the frames 22 and 24.

[0030] The circular shear device according to the invention enables numerous adjustment options when cutting a supplied flat blank using the circular blades 26, 28, 34 and 46. The stable design by means of the two C-shaped brackets, on which the circular blades 26, 28, 34 and 46 and the associated counter blades 30, 32, 36 and counter bearing 48 are guided, enables highly precise cuts.

[0031] Fig. 2 shows two examples of how a supplied flat blank 70 can be cut with the circular knife device according to the invention.

[0032] In Fig. 2 At the top, a flat cut-out, for example from cardboard material for the production of cover boards for a book spine, is fed in the transport direction 14 of the circular knife device 10, which is in Fig. 2 is symbolized only as a vertical dashed line. The flat blank, for example cardboard, is separated from a stack of cardboard, whereby cardboard pushers separate the bottommost cardboard blank and push it towards the circular knife device. The cardboard pushers are in Fig. 2 not shown. However, the design and arrangement of cardboard pushers are well known to those skilled in the art. As soon as the circular knives 26, 28, 34, 46, the counter knives 30, 32, 36 and the counter bearing 48 have gripped the flat blank or cardboard, the material is transported further by the circular knife device 10 by means of the circular knives, counter knives and the counter bearing 48. A back reinforcement or a border 72 is cut by means of the circular knives 26, 28 and the associated counter knives 30, 32. At the same time, the inner side edges of the cover boards 74, 76 are cut while the border 72 is being cut. The in Fig. 2 The upper side edge 78 of the lid board 74 is cut with the circular blade 34 and the counter blade 36. The in Fig. 2 The lower side edge of the cover board 76 is cut with the circular blade 46 and the counter bearing 48. After cutting the cover boards 74, 76 and the blank 72, the setting of the circular blades, counter blades and counter bearing of the circular blade device can remain unchanged or at least be partially changed in order to cut other sizes of cover boards and blanks. With the circular blade device 10 according to the invention, adjustment can be made during operation after the flat blank 70 has passed through, for example also to achieve a batch size of one.

[0033] In Fig. 2 Below is an illustration of how the flat blank is cut to form a Schrenz 72 and two cover boards 80, 82. The Schrenz 72 differs from the one in Fig. 2 The dimensions shown above remain unchanged. Cover board 80 is wider than cover board 74. Cover board 82 has a Fig. 2 The lower convex side edge is raised. This is achieved by initially positioning the circular blade 46 at an angle to the transport direction 14 at the start of the cutting process. The angle is gradually reduced to zero while the circular blade 46 simultaneously moves outwards. Fig. 2 so downwards. This movement is stopped as soon as the angle of the circular blade 46 to the transport direction 14 is reduced to zero, i.e., when point 84 of the side edge is reached. Then the angle of the circular blade 46 to the transport direction 14 is gradually increased again in the opposite direction, and the circular blade 46 is simultaneously moved inwards again. Fig. 2 The circular blade is moved upwards until the starting position is reached and the angle of the circular blade to the transport direction 14 corresponds to the magnitude of the initial angle but with the opposite sign. By moving the circular blade 46 in a way that is coordinated with the transport speed of the flat blank, different side edge profiles can be cut, for example, side edges running diagonally to the transport direction 14, concavely curved side edges, wavy side edges, or side edges that are partially curved and partially straight.

[0034] The circular knife device 10 can only be used to measure the area in Fig. 2 The lower side edge of the cover boards 76, 82 can each be designed with a different profile. However, within the scope of the invention, a circular blade pivotable about a pivot axis perpendicular to the transport direction can also be provided in the bracket 24 in order to also cut the Fig. 2 The upper side edge of the cover boards 74, 80 is to be provided with differently shaped side edges.

[0035] Naturally, the described design and swiveling arrangement of the circular knife 46 can also be used when cutting reference blanks or other flat cutouts.

[0036] Pieces cut from the flat blank are in Fig. 2 Not shown. Such cut-off pieces can be immediately fed into a shredder or chipper, which forms part of the circular blade assembly. This allows the cut-off pieces to be disposed of immediately.

[0037] Fig. 3 The circular knife device 10 shows the Fig. 3 from the front, against the direction of transport 14. The circular knife 46 is in the state of Fig. 3 The flat blank 70 is aligned parallel to the transport direction 14. It is arranged in the circular knife device 10 and between the circular knives 26, 28 and the counter knives 30, 32, between the circular knife 46 and the counter bearing 48, and between the circular knife 34 and the counter knife 36. The circular knives 26, 28, 34 and counter knives 30, 32, 36, which are driven to rotate, as well as the counter bearing 48, which is also driven, convey the flat blank 70 through the circular knife device 10. A control unit 11 is shown only schematically and can control the actuators 42, 44, 54, 58, 62, in particular to a transport speed that is determined by the rotational speed of the electric motor 16. Within the scope of the invention, the control unit 11 can also control or regulate the rotational speed of the electric motor 16.

[0038] Fig. 4 Figure 1 shows an enlarged section of the circular knife device 10. Visible are the pivoting element 50, on which the circular knife 46 is rotatably mounted and which itself is pivotably arranged on a bearing block 51. The bearing block 51, as already described, is attached to a longitudinal guide and can be moved parallel to the upper leg of the bracket 22 by means of the threaded spindle 56. A pivoting movement of the pivoting element 50 is effected by means of the actuator 54. A gear segment 55 on the pivoting element 50, into which a gear 57 engages and which is connected to the shaft of the actuator 54, is only schematically indicated.

[0039] Fig. 5 Figure 1 shows only a part of the circular knife device 10 to illustrate the arrangement of the circular knives 26, 28, 34, and 46 and the counter bearing 48. A flat blank 70 is being fed into the circular knife device, while another blank has already been cut into two cover boards 80 and 86 and a Schrenz 72. The cover board has straight side edges, whereas the Fig. 5 The outer edge 88 of the lid board 86, located at the bottom, has a curved profile. Viewed against the direction of transport 14, the edge 88 initially begins parallel to the direction of transport 14, then curves outwards in a concave shape, changes curvature at approximately half the length of the lid board 86, and then continues in a convex curve, ending again parallel to the direction of transport 14 at the end of the lid board 86. This profile of the edge 88 is achieved by aligning the circular blade 46 parallel to the direction of transport at the beginning of the cutting process, then gradually rotating it obliquely outwards, and from the middle of the cut 70 onwards, gradually reducing the angle of the circular blade 46 to the direction of transport 14 back to zero. The circular blade 46 moves perpendicular to the direction of transport 14 in a coordinated manner.

[0040] Fig. 6 shows the part of the circular knife device of the Fig. 5From above. Visible are the counter bearing 48 and the circular blades 46, 26, 28 and 34.

Claims

1. Circular knife device (10) for cutting to size sheet-like materials, in particular paperboard and / or textile materials, in particular cover boards and / or covering materials, wherein the circular knife device (10) defines a cutting plane in which the sheet-like materials are arranged and are moved along a transport direction (14), having at least one circular knife (46) and an associated circular knife axis, wherein the circular knife (46) is rotatable about the circular knife axis, wherein the at least one circular knife (46) is movable parallel to the cutting plane and perpendicular to the transport direction (14), with the result that a blank width of the sheet-like materials is settable in a variable manner, wherein the at least one circular knife (46) is mounted so as to be pivotable about a pivot axis (52) arranged substantially perpendicular to the cutting plane such that cuts at an angle to the transport direction (14) and curved cuts of the sheet-like materials are able to be executed, characterized in that at least one bracket (22, 24) configured in a U-shaped or C-shaped manner is provided, between the legs of which the cutting plane is arranged and on which the at least one circular knife (46) is arranged and in that the at least one bracket (22, 24) is arranged in a displaceable manner on a machine frame (12) and is displaceable perpendicularly to the transport direction (14) relative to the machine frame (12).

2. Circular knife device according to Claim 1, characterized in that the circular knife (46) can be pivoted by an angle of ±30° with respect to the transport direction.

3. Circular knife device according to Claim 1 or 2, characterized in that the at least one circular knife (46) is mounted on a pivoting element (50) so as to be rotatable about the circular knife axis, in that the pivoting element (50) is mounted on a linear guide element so as to be rotatable about the pivot axis (52), and in that the linear guide element is arranged so as to be displaceable along a linear guide parallel to the cutting plane.

4. Circular knife device according to Claim 3, characterized in that a first actuator, in particular a servomotor (54), is provided for pivoting the pivoting element (50) about the pivot axis (52).

5. Circular knife device according to Claim 3 or 4, characterized in that a second actuator, in particular a servomotor (58), is provided for displacing the linear guide element parallel to the cutting plane.

6. Circular knife device according to any one of the preceding claims, characterized in that a control unit (11) is provided in order to set a pivot angle of the circular knife (46) about the pivot axis (52) depending on a transport speed and / or a position of the sheet-like materials relative to the circular knife (46).

7. Circular knife device according to Claim 6, characterized in that the control unit (11) is provided in order to set a position of the circular knife (46) relative to the linear guide depending on a transport speed and / or a position of the sheet-like materials relative to the circular knife (46).

8. Circular knife device according to Claim 1, characterized in that two brackets (22, 24) configured in a U-shaped or C-shaped manner are provided, the open sides of which face one another.

9. Circular knife device according to Claim 8, characterized in that two circular knives (26, 28) are arranged between the two brackets (22, 24), wherein each circular knife (26, 28) is rotatably mounted on one of the brackets (22, 24).

10. Circular knife device according to Claim 9, characterized in that at least one third actuator (44, 62) is provided in order to set a spacing between the two circular knives (26, 28) relative to one another in the cutting plane.

11. Circular knife device according to Claim 10, characterized in that a control unit (11) is provided in order to set the third actuator (44, 62) depending on a position and / or a transport speed of the sheet-like materials.

12. Circular knife device according to at least one of the preceding claims, characterized in that a shredder or a chopper is arranged downstream of the circular knives on the machine frame so that pieces that are cut away from a sheet-like material can be cut up into small pieces and immediately disposed of.

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