US20080237386A1 - Rotary cutting device - Google Patents
Rotary cutting device Download PDFInfo
- Publication number
- US20080237386A1 US20080237386A1 US12/077,532 US7753208A US2008237386A1 US 20080237386 A1 US20080237386 A1 US 20080237386A1 US 7753208 A US7753208 A US 7753208A US 2008237386 A1 US2008237386 A1 US 2008237386A1
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- US
- United States
- Prior art keywords
- roll
- counter
- cutting
- cutting device
- inner core
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Abandoned
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B26—HAND CUTTING TOOLS; CUTTING; SEVERING
- B26D—CUTTING; DETAILS COMMON TO MACHINES FOR PERFORATING, PUNCHING, CUTTING-OUT, STAMPING-OUT OR SEVERING
- B26D7/00—Details of apparatus for cutting, cutting-out, stamping-out, punching, perforating, or severing by means other than cutting
- B26D7/26—Means for mounting or adjusting the cutting member; Means for adjusting the stroke of the cutting member
- B26D7/2628—Means for adjusting the position of the cutting member
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B26—HAND CUTTING TOOLS; CUTTING; SEVERING
- B26D—CUTTING; DETAILS COMMON TO MACHINES FOR PERFORATING, PUNCHING, CUTTING-OUT, STAMPING-OUT OR SEVERING
- B26D7/00—Details of apparatus for cutting, cutting-out, stamping-out, punching, perforating, or severing by means other than cutting
- B26D7/26—Means for mounting or adjusting the cutting member; Means for adjusting the stroke of the cutting member
- B26D7/2628—Means for adjusting the position of the cutting member
- B26D7/265—Journals, bearings or supports for positioning rollers or cylinders relatively to each other
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B26—HAND CUTTING TOOLS; CUTTING; SEVERING
- B26D—CUTTING; DETAILS COMMON TO MACHINES FOR PERFORATING, PUNCHING, CUTTING-OUT, STAMPING-OUT OR SEVERING
- B26D7/00—Details of apparatus for cutting, cutting-out, stamping-out, punching, perforating, or severing by means other than cutting
- B26D7/20—Cutting beds
- B26D2007/202—Rollers or cylinders being pivoted during operation
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B26—HAND CUTTING TOOLS; CUTTING; SEVERING
- B26F—PERFORATING; PUNCHING; CUTTING-OUT; STAMPING-OUT; SEVERING BY MEANS OTHER THAN CUTTING
- B26F1/00—Perforating; Punching; Cutting-out; Stamping-out; Apparatus therefor
- B26F1/38—Cutting-out; Stamping-out
- B26F1/384—Cutting-out; Stamping-out using rotating drums
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T83/00—Cutting
- Y10T83/465—Cutting motion of tool has component in direction of moving work
- Y10T83/4766—Orbital motion of cutting blade
- Y10T83/4795—Rotary tool
- Y10T83/483—With cooperating rotary cutter or backup
Definitions
- the invention relates to a rotary cutting device, comprising a machine frame, a cutting roll rotatably mounted on the machine frame, and a counter roll mounted on the machine frame, wherein the cutting roll and/or the counter roll comprise an inner core and an outer sleeve disposed around the inner core.
- a device for effecting the rotary cutting of material webs comprising a machine frame and comprising rolls, which are supported in pivot bearings on the machine frame and rotationally driven and define a cutting area, namely a cutting roll and a mating cutting roll, which form between them in the cutting area a roll gap for passage of the material web.
- the cutting roll and mating cutting roll by means of distance rings disposed on them outside of the cutting area are supported so as to roll directly on one another. Between the distance rings at least one adjustable pressure roller member acts on at least one of these rolls and presses this one roll with an adjustable force against the other roll.
- a cutting device in which the cutting tool is biased substantially parallel to an axis of rotation.
- the cutting tool comprises an outer sleeve, on which a cutting edge is seated, and an inner part, wherein the outer sleeve and the inner part are braced towards one another with a clamping force effect substantially parallel to an axis of rotation of the cutting tool.
- a rotary cutting device which is of a simple construction and provides a high cutting quantity.
- the outer sleeve is spaced apart from the inner core and on the inner core there is disposed at least one counter bearing, on which the outer sleeve is supported.
- the outer sleeve is non-rotatably supported not by means of its entire inner surface against the inner core but only by means of at least one “discrete” counter bearing.
- the at least one counter bearing may in this case be disposed both on the cutting roll and on the counter bearing or only on the counter roll or only on the cutting roll.
- the at least one counter bearing it is possible to set a defined flow of force at the cutting roll and/or counter roll, by means of which the effect is achievable that under the action of cutting forces the outer sleeve or outer sleeves bow to a lesser extent than the inner core or inner cores.
- the fundamental problem arises that the cutting roll and the counter roll bend, because they are clamped in place at least at one end on the machine frame.
- the counter roll bends in a direction away from the cutting roll and the cutting roll bends in a direction away from the counter roll. The result is an enlarged gap between the surfaces of the cutting roll and the counter roll that may lead to an impairment of the cutting quality.
- the solution according to the invention makes it possible also to use “less stiff” cutting rolls and/or counter rolls, i.e. in particular to use rolls that have a relatively small diameter and are relatively long. This in turn makes it possible for example to produce large-area cuts that are impossible using rotary cutting devices with shorter rolls. It is further possible in this way also to achieve a higher cutting rate if longer rolls are provided, on which a plurality of cutting areas are disposed.
- the at least one counter bearing is disposed and configured in such a way that forces, which the cutting roll and counter roll exert on one another, may be removed in a defined manner by means of the at least one counter bearing on the counter roll and/or cutting roll.
- a flow of force at the counter roll and/or cutting roll is achievable, whereby the bowing of the outer sleeve is smaller than the bowing of the inner core.
- the at least one counter bearing is disposed and configured in such a way that the outer sleeve is movable by elastic deformation relative to the inner core.
- a relative mobility between outer sleeve and inner core enables a relative excursion between outer sleeve and inner core. The effect may therefore be achieved that the outer sleeve bends to a lesser extent than the inner sleeve under the action of cutting forces.
- the at least one counter bearing is disposed and configured in such a way that during a cutting operation a bowing of the outer sleeve is smaller than a bowing of the inner core.
- this clearance zone may be in an order of magnitude range of between for example 2 ⁇ m and 100 ⁇ m. It may also be greater. This clearance zone allows a relative excursion between the outer sleeve and the inner core in order thereby in turn to keep low the bowing at the surface of the cutting roll and/or counter roll.
- the at least one counter bearing is disposed and configured in such a way that there arises at the cutting roll and/or counter roll during a cutting operation an at least approximately symmetrical flow of force in relation to the cutting roll length and/or counter roll length.
- the flow of force is in particular symmetrical in relation to a transverse centre plane (which is perpendicular to the axis of rotation) of the cutting roll and/or counter roll. It is therefore possible to achieve at the surface of the cutting roll a minimized bowing that is symmetrical to the said centre plane.
- the at least one counter bearing is formed for example by a plurality of balls that are disposed on the inner core.
- the at least one counter bearing comprises an annular region that is disposed on the inner core.
- the annular region surrounds the inner core in particular in a band-like manner.
- the annular region is formed for example by a ring element that is disposed on the inner core.
- the annular region may alternatively be formed integrally on the inner core.
- the width of an annular region is smaller than the total length of the respective counter roll and/or cutting roll and is in particular considerably smaller. It is for example at most 30% of the respective total length. In principle, it is advantageous if the annular region has as low a width as possible. At the annular region, where forces are transmitted, the pressure per surface unit does however have to be within the elastic range. This defines the minimum extent of the annular region.
- the outer sleeve is fixed on the at least one counter bearing for example by means of positive-locking elements. In this way, the outer sleeve is easily fixable axially and radially relative to the inner core.
- At least one seal is disposed between the outer sleeve and the inner core.
- the seal is disposed in particular on one or more end faces of the outer sleeve. In this way, it is possible to seal off an intermediate space between the outer sleeve and the inner core.
- the at least one counter bearing is disposed symmetrically on the cutting roll and/or counter roll. If for example a single counter bearing is provided for the cutting roll or counter roll, then it is disposed centrally (in relation to a counter roll length and/or cutting roll length). If a plurality of counter bearings are provided, then they are disposed in particular symmetrically relative to a centre plane of the counter roll and/or cutting roll.
- the cutting roll comprises an outer sleeve
- one or more cutting edges are disposed on the outer sleeve of the cutting roll.
- the cutting roll and the counter roll are provided with in each case at least one counter bearing, an opposite-lying arrangement of counter bearings is particularly advantageous.
- a counter bearing of the cutting roll and a counter bearing of the counter roll are then positioned opposite one another.
- the counter bearings are arranged to be aligned in a direction transversely of an axis of rotation of the cutting roll. In this way, forces may be removed in a defined manner and the surface bowing both at the cutting roll and at the counter roll may be minimized. As a result, an optimum cutting result is obtained.
- the cutting roll is supported against the counter roll by means of at least one supporting ring.
- the at least one supporting ring may in this case be disposed on the cutting roll or the counter roll.
- a first supporting ring and a second supporting ring are then provided, wherein the at least one counter bearing is disposed on the counter roll and/or cutting roll between the first supporting ring and the second supporting ring.
- the counter roll is in particular rotatably mounted. It may in this case be driven directly (by its own drive or via a gear device that is connected to the drive of the cutting roll). In principle it is also possible for the counter roll to be driven by friction locking with material that is to pass through.
- the cutting roll is mounted at two ends on the machine frame. Then in particular a first pivot bearing and a spaced-apart second pivot bearing are provided.
- the counter roll is also mounted at two ends on the machine frame.
- the cutting roll may be mounted at one end (for example rotatably by means of a single bearing) on the machine frame.
- Such a rotary cutting device with a cantilevered cutting roll may be constructed in a compact manner.
- the counter roll is then in particular also mounted at one end in a “cantilevered” manner on the machine frame.
- the rotary cutting device is configured as a transverse cutting device. It is therefore possible for example to cut material webs at a high cutting rate.
- one or more longitudinal cutting edges are disposed on the cutting roll.
- cutting edges are configured in a way that allows the introduction of profile cuts.
- FIG. 1 shows a side view of an embodiment of a rotary cutting device according to the invention
- FIG. 2 shows a diagrammatic representation of a counter roll
- FIG. 3 shows a frontal plan view of the counter roll according to FIG. 2 ;
- FIG. 4 shows a sectional view of the counter roll along the line 4 - 4 according to FIG. 3 ;
- FIG. 5 shows an enlarged representation of the area A according to FIG. 4 ;
- FIG. 6 shows diagrammatically the deformation of an inner core of the counter roll over the length thereof under the action of a cutting force
- FIG. 7 shows adapted thereto, the deformation of a corresponding rotary roll when the latter acts upon the counter roll
- FIG. 8 shows diagrammatically the deformation of an outer sleeve compared to the inner core in the solution according to the invention
- FIG. 9 shows a second embodiment of a rotary cutting device (transverse cutting device) according to the invention.
- FIG. 10 shows a sectional view of the rotary cutting device according to FIG. 9 ;
- FIG. 11 shows a third embodiment of a rotary cutting device according to the invention.
- a first embodiment of a rotary cutting device according to the invention which is shown in FIG. 1 and denoted there by 10 , is realized as a rotary cutting machine. It comprises a machine frame 12 , which is of a column-like design.
- the machine frame 12 comprises opposing columns 14 , which are connected by a bottom bridge 16 and a top bridge 18 .
- the rotary cutting device 10 is positioned via the bottom bridge 16 on a foundation.
- the respective columns 14 in turn comprise opposing column supports 20 a , 20 b.
- a cutting roll 22 and a counter roll 24 are rotatably mounted on the columns 14 of the machine frame 12 in each case.
- the cutting roll 22 in this case is mounted by means of opposite-lying pivot bearings 26 so as to be rotatable about an axis 28 .
- the axis 28 is perpendicular to the drawing plane.
- a drive for the rotational movement (not shown in the drawings).
- a bias device 30 the cutting roll 22 may be pressed against the counter roll 24 .
- the cutting roll 22 is supported by opposite-lying supporting rings 32 on a surface 34 of the counter roll 24 .
- the counter roll 24 it is also possible for the counter roll 24 to be provided with supporting rings that are supported on a surface of the cutting roll 22 .
- the pivot bearings 26 for the cutting roll 22 are disposed on a respective bearing device 36 , which is displaceable linearly on the machine frame 12 .
- the bearing device 36 as a whole including the pivot bearings 26 and the cutting roll 22 ) may be displaced towards the counter roll 24 in order to exert a cutting force.
- the cutting roll 22 comprises one or more cutting edges 38 , which are disposed between the supporting rings 32 .
- the counter roll 24 is likewise mounted rotatably about an axis 42 by means of opposite-lying pivot bearings 40 , which are disposed on the respective columns 14 .
- the axis 42 is parallel to the axis 28 .
- a material 44 to be cut which is in particular in the form of a web, is passed through between the counter roll 24 and the cutting roll 22 between the supporting rings 32 .
- the counter roll 24 and the cutting roll 22 rotate in opposite directions to one another.
- the bias device 30 the cutting roll 22 is pressed against the counter roll 24 in order to exert a cutting force.
- the counter roll 24 comprises an inner core 46 ( FIGS. 2 to 4 ).
- the inner core 46 is in particular of a cylindrical design and rotationally symmetrical relative to an axis 48 , which coincides with the axis of rotation 42 .
- first shaft stub 50 and a second shaft stub 52 Disposed on the inner core are a first shaft stub 50 and a second shaft stub 52 , by means of which the counter roll 24 is rotatably mounted.
- a first counter bearing 54 a and a second counter bearing 54 b are disposed on the inner core 46 .
- These counter bearings 54 a , 54 b are of an annular design and disposed in the manner of a band on the inner core 46 .
- the counter bearings 54 a , 54 b in this case may be integrally connected to the inner core 46 or may be separate parts that are fixed on the inner core 46 .
- the first counter bearing 54 a and the second counter bearing 54 b have a larger radius r 1 than a surface region 56 (radius r 2 ) of the inner core 46 outside of the counter bearings 54 a , 54 b .
- the counter bearings 54 a , 54 b therefore project in a step-like manner from the surface region 56 . They comprise in each case a contact region 58 that is spaced radially apart from the surface region 56 of the inner core 46 .
- the counter bearings 54 a , 54 b are “discrete” supports having a width (parallel to the axis 48 ) that is considerably smaller than the total length of the counter roll 24 . In particular, this width is smaller than 30% of the total length.
- the smaller the width of a counter bearing 54 a , 54 b the more advantageous it is for the introduction of force.
- the smaller the width the less the mobility of the outer sleeve 60 relative to the inner core 46 is impeded. It is however necessary in this case to ensure that the pressure per unit area acting upon a counter bearing still lies within the elastic range of the counter bearing in order to prevent any plastic deformation.
- the relative width of a counter bearing in relation to the total length of a cutting roll or counter roll may lie also in a range of 0.5% or less. The extent is dependent upon the particular condition of the corresponding rotary cutting device.
- the counter roll 24 further comprises an outer sleeve 60 , on which the surface 34 of the counter roll 24 is formed.
- This surface 34 is in particular cylindrical.
- the outer sleeve 60 has the shape of a hollow cylinder. The cutting roll 22 with the supporting rings 32 acts upon this outer sleeve 60 .
- the outer sleeve 60 is supported on the discrete counter bearings 54 a , 54 b non-rotatably with regard to the inner core 46 ; the outer sleeve 60 is mounted on the inner core 46 , not by the entire surface region 56 , but only by the contact regions 58 of the counter bearings 54 a , 54 b . Between an inner side 62 of the outer sleeve 60 and the surface region 56 of the inner core 46 an intermediate space 64 is formed. This intermediate space 64 allows a relative excursion between the outer sleeve 60 and the inner core 46 in particular by means of differing elastic deformation of the inner core 46 and the outer sleeve 60 .
- the first counter bearing 54 a and the second counter bearing 54 b are disposed symmetrically on the inner core 46 . They are equidistant from a centre plane 66 of the counter roll 24 .
- the centre plane 66 in this case lies at right angles to the axis 48 .
- the first counter bearing 54 a is moreover at the same distance from a first end face 68 a of the inner core 46 (outside of the first shaft stub 50 ) as the second counter bearing 54 b is from an opposite-lying second end face 68 b.
- the outer sleeve 60 is fixed in relation to the inner core 46 .
- it is fixed by positive-locking means by means of the counter bearings 54 a , 54 b on the inner core 46 .
- the outer sleeve 60 is restrained axially.
- support rings 70 a , 70 b which are disposed in the vicinity of the first end face 68 a and second front face 68 b respectively.
- Disposed between each support ring 70 a , 70 b and a respective end face of the outer sleeve 60 is a seal 72 a , 72 b , wherein this seal in particular has the shape of an O-ring.
- the seals 72 a , 72 b the intermediate space 64 is sealed off at each end face of the outer sleeve 60 .
- the support rings 70 a , 70 b are held on the inner core 46 by means of respective locking rings 74 a , 74 b in a direction away from the outer sleeve 60 .
- a height h of the intermediate space 64 lies for example in the range of between 2 ⁇ m and 100 ⁇ m depending on the individual application.
- the height h may also be smaller or larger than has just been mentioned.
- the counter roll 24 is provided with at least one counter bearing in the manner described. It may alternatively or additionally be provided that the cutting roll 22 is provided with one or more counter bearings. The construction and arrangement of such counter bearings on the cutting roll 22 is in principle the same as described in connection with the counter roll 24 .
- the cutting roll 22 is pressed by the bias device 30 against the counter roll.
- a force is exerted on the counter roll 24 and an opposing force is exerted on the cutting roll 22 .
- the counter roll 24 is restrained by its pivot bearings 40 in the region of the first shaft stub 50 and the second shaft stub 52 in each case on the machine frame 12 . This is indicated in FIG. 6 by the supporting points 76 a , 76 b .
- forces 78 are exerted from the direction of the cutting roll. In the illustrated embodiment, these forces 78 act from above in relation to the gravitational force direction g. These forces 78 give rise to a bowing of the counter roll 24 (above all, of the inner core 46 ) in a downward direction.
- FIG. 6 a graph for a counter roll having a diameter of 50 mm is shown, in which the excursion dy of the inner core 46 over the length l of the counter roll 24 is shown. In this case, cutting forces in the order of magnitude of 125 N/mm were exerted.
- FIG. 7 the cutting roll 22 is shown with a shaft stub 80 a and a shaft stub 80 b .
- a force is exerted in the direction of the counter roll 24 .
- this is a force parallel to the gravitational force direction g.
- the cutting roll 22 in this case is clamped in place in an upward direction. This is indicated in FIG. 7 by supporting points 82 a , 82 b.
- the cutting roll 22 is bent in an upward direction.
- an inner core of the cutting roll 22 if the cutting roll has such an inner core, is bent in an upward direction.
- FIG. 7 a graph of the excursion of the cutting roll and/or of an inner core of the cutting roll over the length l of the cutting roll 22 is shown.
- the data correspond to a cutting roll having a diameter of 40 mm with effective cutting forces of 125 N/mm.
- FIGS. 6 and 7 are compared, then with regard to the corresponding inner cores of the cutting roll 22 and the counter roll 24 there would be in the central region a relative excursion of opposite-lying surface regions of the cutting roll 22 and the counter roll 24 of ca. 60 ⁇ m, if these surface regions were to follow the bowing of the inner cores. Such excursions, if present at the surface of the counter roll 24 and the cutting roll 22 , impair the quality of the cutting result.
- the outer sleeve 60 is supported by means of the counter bearings 54 a , 54 b on the inner core 46 .
- This support may be provided both for the cutting roll 22 and for the counter roll 24 or only for the cutting roll 22 or only for the counter roll 24 .
- This allows forces during the cutting operation and in particular cutting forces to be introduced and removed in a defined manner. Via the counter bearings 54 a , 54 b cutting forces may be introduced from the outer sleeve 60 into the inner core 46 and therefore removed via the corresponding pivot bearings 26 and/or 40 .
- the effect may be achieved that the outer sleeve 60 is bent to a lesser extent than the corresponding inner core 46 . This is indicated in a highly exaggerated manner in FIG. 8 .
- the inner core 46 experiences an elastic deformation and in particular bowing.
- the outer sleeve 60 also experiences in principle an elastic deformation and bowing.
- one or more counter bearings are provided. These counter bearings are disposed and configured in such a way that a symmetrical flow of force arises at the cutting roll 22 and/or the counter roll 24 .
- the flow of force is in this case in particular symmetrical relative to the centre plane 66 .
- a defined removal of the flow of force is obtained at the counter roll 24 and/or the cutting roll 22 .
- This allows the outer sleeve 60 to deform elastically to a lesser extent than the corresponding inner core 46 .
- This in turn means that surface regions 84 of the cutting roll 22 (if this is provided with one or more counter bearings) and/or of the counter roll 24 (if this is provided with one or more counter bearings) are deformed to a lesser extent than if the outer sleeve 60 was seated by its “full surface” on the inner core 46 and/or no outer sleeve at all was provided.
- the rotary cutting device 10 is for example configured in such a way that on the cutting roll 22 cutting edges are disposed, which are arranged in a longitudinal direction (in relation to a longitudinal direction 86 ( FIG. 1 ) for the conveying of material 44 ) and in a transverse direction thereto.
- a second embodiment of a rotary cutting device according to the invention which is shown in FIG. 9 and denoted there by 88 , comprises a machine frame 90 , on which in basically the same manner as described above a cutting roll 92 and a counter roll 94 are in each case rotatably mounted.
- the counter roll 94 is of basically the same design as the counter roll 24 as described above.
- the cutting roll 92 is for example driven by a drive (not shown in the drawing). Disposed on a shaft stub 96 of the cutting roll is a gear wheel 98 , which meshes into a gear wheel 100 that is fastened in a rotationally fixed manner relative to the counter roll 94 . Thus, by driving the cutting roll 92 the counter roll 94 can also be driven.
- the cutting roll 92 comprises a first roll region 102 a and a second roll region 102 b , wherein these two roll regions 102 a , 102 b are spaced apart from one another.
- the transverse cutting edges 104 comprise a cutting surface 106 , which are transverse and in particular at right angles to a direction of conveying of material through the rotary cutting device 88 .
- the cutting surfaces 106 are oriented parallel to an axis of rotation 108 of the cutting roll 92 .
- Counter bearings 110 a , 110 b are disposed in a central region of the first roll region 102 a and the second roll region 102 b respectively.
- the counter bearing 110 a , 110 b in this case is of basically the same design as described above. In particular, these are annular regions that are disposed on a respective inner core 112 of the cutting roll 92 .
- the counter roll 94 likewise comprises an inner core 114 , on which spaced-apart counter bearings 116 a , 116 b are disposed.
- the counter bearings 116 a , 116 b are aligned with the counter bearings 110 a , 110 b and positioned directly opposite so that a direct introduction of force at the counter bearings is possible.
- the counter bearing 116 a is then positioned opposite the counter bearing 110 a
- the counter bearing 116 b is positioned opposite the counter bearing 110 b.
- a machine frame 120 is provided on the machine frame 120 .
- a first pivot bearing 122 for a counter roll 124 is disposed on the machine frame 120 .
- a second pivot bearing 126 is further disposed on the machine frame 120 at a distance from, for example above, the first pivot bearing 122 .
- a cutting roll 128 is rotatably mounted.
- the cutting roll 128 and the counter roll 124 are therefore in each case not mounted at two ends on the machine frame 120 but held only at one end in a “cantilevered” manner on the machine frame 120 .
- the cutting roll 128 comprises for example oppositely-lying supporting rings 130 a , 130 b .
- the cutting roll 128 is supported on a surface 132 of the counter roll 124 .
- a construction with no supporting ring is also possible.
- the cutting roll 128 is provided with cutting edges 134 .
- the cutting edges 134 are of a design adapted to the material to be cut.
- the counter roll 124 and the cutting roll 128 comprise in each case, as described above, an inner core and respective outer sleeves 136 and 138 .
- the outer sleeve 138 of the cutting roll 128 in this case is supported by a single counter bearing 140 on the corresponding inner core of the cutting roll 128 .
- the outer sleeve 136 of the counter roll 124 is supported by a counter bearing 142 on the inner core of the counter roll 124 .
- the counter bearings 140 and 142 lie directly opposite in order to enable a direct introduction of force.
- the rotary cutting device 118 operates in the manner described above.
Abstract
A rotary cutting device is provided, comprising a machine frame, a cutting roll rotatably mounted on the machine frame, and a counter roll mounted on the machine frame, wherein the cutting roll and/or the counter roll comprise an inner core and an outer sleeve disposed around the inner core, the outer sleeve is spaced apart from the inner core, and on the inner core at least one counter bearing is disposed, on which the outer sleeve is supported.
Description
- The present disclosure relates to the subject matter disclosed in
German application number 10 2007 016 451.5 of Mar. 30, 2007, which is incorporated herein by reference in its entirety and for all purposes. - The invention relates to a rotary cutting device, comprising a machine frame, a cutting roll rotatably mounted on the machine frame, and a counter roll mounted on the machine frame, wherein the cutting roll and/or the counter roll comprise an inner core and an outer sleeve disposed around the inner core.
- From DE 39 24 053 A1 a device for effecting the rotary cutting of material webs is known, comprising a machine frame and comprising rolls, which are supported in pivot bearings on the machine frame and rotationally driven and define a cutting area, namely a cutting roll and a mating cutting roll, which form between them in the cutting area a roll gap for passage of the material web. The cutting roll and mating cutting roll by means of distance rings disposed on them outside of the cutting area are supported so as to roll directly on one another. Between the distance rings at least one adjustable pressure roller member acts on at least one of these rolls and presses this one roll with an adjustable force against the other roll.
- From
EP 1 238 765 A2 a cutting device is known, in which the cutting tool is biased substantially parallel to an axis of rotation. The cutting tool comprises an outer sleeve, on which a cutting edge is seated, and an inner part, wherein the outer sleeve and the inner part are braced towards one another with a clamping force effect substantially parallel to an axis of rotation of the cutting tool. - Further rotary cutting devices are known from EP 0 976 510 A2,
EP 1 180 419 A1,EP 1 186 387 A2 andEP 1 721 712 A1. - In accordance with the present invention, a rotary cutting device is provided, which is of a simple construction and provides a high cutting quantity.
- In accordance with an embodiment of the invention, the outer sleeve is spaced apart from the inner core and on the inner core there is disposed at least one counter bearing, on which the outer sleeve is supported.
- In the solution according to the invention the outer sleeve is non-rotatably supported not by means of its entire inner surface against the inner core but only by means of at least one “discrete” counter bearing. The at least one counter bearing may in this case be disposed both on the cutting roll and on the counter bearing or only on the counter roll or only on the cutting roll.
- By means of the at least one counter bearing it is possible to set a defined flow of force at the cutting roll and/or counter roll, by means of which the effect is achievable that under the action of cutting forces the outer sleeve or outer sleeves bow to a lesser extent than the inner core or inner cores. During cutting the fundamental problem arises that the cutting roll and the counter roll bend, because they are clamped in place at least at one end on the machine frame. Under the action of cutting forces, the counter roll bends in a direction away from the cutting roll and the cutting roll bends in a direction away from the counter roll. The result is an enlarged gap between the surfaces of the cutting roll and the counter roll that may lead to an impairment of the cutting quality.
- With the solution according to the invention it is possible to reduce the bending of the cutting roll and/or counter roll at the surface since by means of the counter bearing forces may be guided away from the outer sleeve into the inner core and from there via a bearing arrangement. Given a corresponding arrangement of the at least one counter bearing, it is therefore possible to reduce the relative bowing at the surface of the cutting roll and/or counter roll. The arrangement and configuration of the at least one counter bearing depends on the respective application.
- The solution according to the invention makes it possible also to use “less stiff” cutting rolls and/or counter rolls, i.e. in particular to use rolls that have a relatively small diameter and are relatively long. This in turn makes it possible for example to produce large-area cuts that are impossible using rotary cutting devices with shorter rolls. It is further possible in this way also to achieve a higher cutting rate if longer rolls are provided, on which a plurality of cutting areas are disposed.
- In particular, the at least one counter bearing is disposed and configured in such a way that forces, which the cutting roll and counter roll exert on one another, may be removed in a defined manner by means of the at least one counter bearing on the counter roll and/or cutting roll. A flow of force at the counter roll and/or cutting roll is achievable, whereby the bowing of the outer sleeve is smaller than the bowing of the inner core.
- For the same reason, it is advantageous if the at least one counter bearing is disposed and configured in such a way that the outer sleeve is movable by elastic deformation relative to the inner core. A relative mobility between outer sleeve and inner core enables a relative excursion between outer sleeve and inner core. The effect may therefore be achieved that the outer sleeve bends to a lesser extent than the inner sleeve under the action of cutting forces.
- For the same reason, it is advantageous if the at least one counter bearing is disposed and configured in such a way that during a cutting operation a bowing of the outer sleeve is smaller than a bowing of the inner core.
- It is advantageous if outside of the at least one counter bearing between the outer sleeve and the inner core there is an intermediate space (clearance zone). The height of this clearance zone (in radial direction) may be in an order of magnitude range of between for example 2 μm and 100 μm. It may also be greater. This clearance zone allows a relative excursion between the outer sleeve and the inner core in order thereby in turn to keep low the bowing at the surface of the cutting roll and/or counter roll.
- For the same reason, it is advantageous if between adjacent counter bearings there is an intermediate space (clearance zone). The outer sleeve is then mounted on the inner core by means of discrete counter bearings.
- It is advantageous if the at least one counter bearing is disposed and configured in such a way that there arises at the cutting roll and/or counter roll during a cutting operation an at least approximately symmetrical flow of force in relation to the cutting roll length and/or counter roll length. The flow of force is in particular symmetrical in relation to a transverse centre plane (which is perpendicular to the axis of rotation) of the cutting roll and/or counter roll. It is therefore possible to achieve at the surface of the cutting roll a minimized bowing that is symmetrical to the said centre plane.
- It is in principle possible for the at least one counter bearing to be formed for example by a plurality of balls that are disposed on the inner core. In an—in manufacturing terms—simple form of construction, the at least one counter bearing comprises an annular region that is disposed on the inner core. The annular region surrounds the inner core in particular in a band-like manner. The annular region is formed for example by a ring element that is disposed on the inner core. The annular region may alternatively be formed integrally on the inner core.
- The width of an annular region is smaller than the total length of the respective counter roll and/or cutting roll and is in particular considerably smaller. It is for example at most 30% of the respective total length. In principle, it is advantageous if the annular region has as low a width as possible. At the annular region, where forces are transmitted, the pressure per surface unit does however have to be within the elastic range. This defines the minimum extent of the annular region.
- In one form of construction it is provided that the outer sleeve is fixed on the at least one counter bearing for example by means of positive-locking elements. In this way, the outer sleeve is easily fixable axially and radially relative to the inner core.
- It may be provided that at least one seal is disposed between the outer sleeve and the inner core. The seal is disposed in particular on one or more end faces of the outer sleeve. In this way, it is possible to seal off an intermediate space between the outer sleeve and the inner core.
- It is quite particularly advantageous if the at least one counter bearing is disposed symmetrically on the cutting roll and/or counter roll. If for example a single counter bearing is provided for the cutting roll or counter roll, then it is disposed centrally (in relation to a counter roll length and/or cutting roll length). If a plurality of counter bearings are provided, then they are disposed in particular symmetrically relative to a centre plane of the counter roll and/or cutting roll.
- It may be provided that, if the cutting roll comprises an outer sleeve, one or more cutting edges are disposed on the outer sleeve of the cutting roll.
- If the cutting roll and the counter roll are provided with in each case at least one counter bearing, an opposite-lying arrangement of counter bearings is particularly advantageous. A counter bearing of the cutting roll and a counter bearing of the counter roll are then positioned opposite one another. In this case, the counter bearings are arranged to be aligned in a direction transversely of an axis of rotation of the cutting roll. In this way, forces may be removed in a defined manner and the surface bowing both at the cutting roll and at the counter roll may be minimized. As a result, an optimum cutting result is obtained.
- In one form of construction the cutting roll is supported against the counter roll by means of at least one supporting ring. The at least one supporting ring may in this case be disposed on the cutting roll or the counter roll.
- In particular, a first supporting ring and a second supporting ring are then provided, wherein the at least one counter bearing is disposed on the counter roll and/or cutting roll between the first supporting ring and the second supporting ring. In this way, an optimization of the flow of force is achievable.
- The counter roll is in particular rotatably mounted. It may in this case be driven directly (by its own drive or via a gear device that is connected to the drive of the cutting roll). In principle it is also possible for the counter roll to be driven by friction locking with material that is to pass through.
- In one form of construction, the cutting roll is mounted at two ends on the machine frame. Then in particular a first pivot bearing and a spaced-apart second pivot bearing are provided.
- In this case, it is advantageous if the counter roll is also mounted at two ends on the machine frame.
- It is also possible for the cutting roll to be mounted at one end (for example rotatably by means of a single bearing) on the machine frame. Such a rotary cutting device with a cantilevered cutting roll may be constructed in a compact manner.
- In this case, the counter roll is then in particular also mounted at one end in a “cantilevered” manner on the machine frame.
- On the cutting roll for example one or more transverse cutting edges are disposed. For example, the rotary cutting device is configured as a transverse cutting device. It is therefore possible for example to cut material webs at a high cutting rate.
- It is also additionally or alternatively possible for one or more longitudinal cutting edges to be disposed on the cutting roll. In particular, cutting edges are configured in a way that allows the introduction of profile cuts.
- The following description of preferred embodiments serves in connection with the drawings to provide a detailed explanation of the invention.
-
FIG. 1 shows a side view of an embodiment of a rotary cutting device according to the invention; -
FIG. 2 shows a diagrammatic representation of a counter roll; -
FIG. 3 shows a frontal plan view of the counter roll according toFIG. 2 ; -
FIG. 4 shows a sectional view of the counter roll along the line 4-4 according toFIG. 3 ; -
FIG. 5 shows an enlarged representation of the area A according toFIG. 4 ; -
FIG. 6 shows diagrammatically the deformation of an inner core of the counter roll over the length thereof under the action of a cutting force; -
FIG. 7 shows adapted thereto, the deformation of a corresponding rotary roll when the latter acts upon the counter roll; -
FIG. 8 shows diagrammatically the deformation of an outer sleeve compared to the inner core in the solution according to the invention; -
FIG. 9 shows a second embodiment of a rotary cutting device (transverse cutting device) according to the invention; -
FIG. 10 shows a sectional view of the rotary cutting device according toFIG. 9 ; and -
FIG. 11 shows a third embodiment of a rotary cutting device according to the invention. - A first embodiment of a rotary cutting device according to the invention, which is shown in
FIG. 1 and denoted there by 10, is realized as a rotary cutting machine. It comprises amachine frame 12, which is of a column-like design. Themachine frame 12 comprises opposingcolumns 14, which are connected by abottom bridge 16 and a top bridge 18. Therotary cutting device 10 is positioned via thebottom bridge 16 on a foundation. - The
respective columns 14 in turn comprise opposing column supports 20 a, 20 b. - On the
columns 14 of themachine frame 12 in each case a cuttingroll 22 and a counter roll 24 (anvil roll) are rotatably mounted. The cuttingroll 22 in this case is mounted by means of opposite-lyingpivot bearings 26 so as to be rotatable about anaxis 28. InFIG. 1 theaxis 28 is perpendicular to the drawing plane. - Associated with the cutting
roll 22 is a drive for the rotational movement (not shown in the drawings). By means of abias device 30 the cuttingroll 22 may be pressed against thecounter roll 24. - The cutting
roll 22 is supported by opposite-lying supporting rings 32 on asurface 34 of thecounter roll 24. Alternatively, it is also possible for thecounter roll 24 to be provided with supporting rings that are supported on a surface of the cuttingroll 22. - The
pivot bearings 26 for the cuttingroll 22 are disposed on arespective bearing device 36, which is displaceable linearly on themachine frame 12. By means of thebias device 30 thebearing device 36 as a whole (including thepivot bearings 26 and the cutting roll 22) may be displaced towards thecounter roll 24 in order to exert a cutting force. - The cutting
roll 22 comprises one ormore cutting edges 38, which are disposed between the supporting rings 32. - The
counter roll 24 is likewise mounted rotatably about anaxis 42 by means of opposite-lyingpivot bearings 40, which are disposed on therespective columns 14. Theaxis 42 is parallel to theaxis 28. - To carry out a cutting operation, a
material 44 to be cut, which is in particular in the form of a web, is passed through between thecounter roll 24 and the cuttingroll 22 between the supporting rings 32. Thecounter roll 24 and the cuttingroll 22 rotate in opposite directions to one another. By means of thebias device 30 the cuttingroll 22 is pressed against thecounter roll 24 in order to exert a cutting force. - The
counter roll 24 comprises an inner core 46 (FIGS. 2 to 4 ). Theinner core 46 is in particular of a cylindrical design and rotationally symmetrical relative to anaxis 48, which coincides with the axis ofrotation 42. - Disposed on the inner core are a
first shaft stub 50 and asecond shaft stub 52, by means of which thecounter roll 24 is rotatably mounted. - In the illustrated embodiment, a first counter bearing 54 a and a second counter bearing 54 b are disposed on the
inner core 46. Thesecounter bearings inner core 46. Thecounter bearings inner core 46 or may be separate parts that are fixed on theinner core 46. - The first counter bearing 54 a and the second counter bearing 54 b, as indicated in
FIG. 5 , have a larger radius r1 than a surface region 56 (radius r2) of theinner core 46 outside of thecounter bearings counter bearings surface region 56. They comprise in each case acontact region 58 that is spaced radially apart from thesurface region 56 of theinner core 46. - The
counter bearings counter roll 24. In particular, this width is smaller than 30% of the total length. In principle, the smaller the width of a counter bearing 54 a, 54 b, the more advantageous it is for the introduction of force. The smaller the width, the less the mobility of theouter sleeve 60 relative to theinner core 46 is impeded. It is however necessary in this case to ensure that the pressure per unit area acting upon a counter bearing still lies within the elastic range of the counter bearing in order to prevent any plastic deformation. For example, the relative width of a counter bearing in relation to the total length of a cutting roll or counter roll may lie also in a range of 0.5% or less. The extent is dependent upon the particular condition of the corresponding rotary cutting device. - The
counter roll 24 further comprises anouter sleeve 60, on which thesurface 34 of thecounter roll 24 is formed. Thissurface 34 is in particular cylindrical. Theouter sleeve 60 has the shape of a hollow cylinder. The cuttingroll 22 with the supportingrings 32 acts upon thisouter sleeve 60. - The
outer sleeve 60 is supported on thediscrete counter bearings inner core 46; theouter sleeve 60 is mounted on theinner core 46, not by theentire surface region 56, but only by thecontact regions 58 of thecounter bearings inner side 62 of theouter sleeve 60 and thesurface region 56 of theinner core 46 anintermediate space 64 is formed. Thisintermediate space 64 allows a relative excursion between theouter sleeve 60 and theinner core 46 in particular by means of differing elastic deformation of theinner core 46 and theouter sleeve 60. - The first counter bearing 54 a and the second counter bearing 54 b are disposed symmetrically on the
inner core 46. They are equidistant from acentre plane 66 of thecounter roll 24. Thecentre plane 66 in this case lies at right angles to theaxis 48. The first counter bearing 54 a is moreover at the same distance from afirst end face 68 a of the inner core 46 (outside of the first shaft stub 50) as the second counter bearing 54 b is from an opposite-lyingsecond end face 68 b. - The
outer sleeve 60 is fixed in relation to theinner core 46. For example, it is fixed by positive-locking means by means of thecounter bearings inner core 46. - It may additionally or alternatively be provided that the
outer sleeve 60 is restrained axially. For this purpose there are provided for example opposite-lying support rings 70 a, 70 b, which are disposed in the vicinity of thefirst end face 68 a and secondfront face 68 b respectively. Disposed between eachsupport ring outer sleeve 60 is aseal seals intermediate space 64 is sealed off at each end face of theouter sleeve 60. - The support rings 70 a, 70 b are held on the
inner core 46 by means of respective locking rings 74 a, 74 b in a direction away from theouter sleeve 60. - A height h of the
intermediate space 64 lies for example in the range of between 2 μm and 100 μm depending on the individual application. The height h may also be smaller or larger than has just been mentioned. - The
counter roll 24 is provided with at least one counter bearing in the manner described. It may alternatively or additionally be provided that the cuttingroll 22 is provided with one or more counter bearings. The construction and arrangement of such counter bearings on the cuttingroll 22 is in principle the same as described in connection with thecounter roll 24. - During a rotary cutting operation the cutting
roll 22 is pressed by thebias device 30 against the counter roll. By virtue of the cutting forces a force is exerted on thecounter roll 24 and an opposing force is exerted on the cuttingroll 22. - The
counter roll 24 is restrained by itspivot bearings 40 in the region of thefirst shaft stub 50 and thesecond shaft stub 52 in each case on themachine frame 12. This is indicated inFIG. 6 by the supportingpoints 76 a, 76 b. By means of the cuttingroll 22forces 78 are exerted from the direction of the cutting roll. In the illustrated embodiment, theseforces 78 act from above in relation to the gravitational force direction g. Theseforces 78 give rise to a bowing of the counter roll 24 (above all, of the inner core 46) in a downward direction. - In
FIG. 6 a graph for a counter roll having a diameter of 50 mm is shown, in which the excursion dy of theinner core 46 over the length l of thecounter roll 24 is shown. In this case, cutting forces in the order of magnitude of 125 N/mm were exerted. - It is evident that in a central region of the
counter roll 24 theinner core 46 experiences a downward excursion in the order of magnitude of 22 μm. - In
FIG. 7 the cuttingroll 22 is shown with ashaft stub 80 a and ashaft stub 80 b. By means of the bias device 30 a force is exerted in the direction of thecounter roll 24. In the illustrated embodiment, this is a force parallel to the gravitational force direction g. The cuttingroll 22 in this case is clamped in place in an upward direction. This is indicated inFIG. 7 by supportingpoints - Because of the effective forces and in particular the reaction force of the
counter roll 24, the cuttingroll 22 is bent in an upward direction. In particular, an inner core of the cuttingroll 22, if the cutting roll has such an inner core, is bent in an upward direction. - In
FIG. 7 a graph of the excursion of the cutting roll and/or of an inner core of the cutting roll over the length l of the cuttingroll 22 is shown. The data correspond to a cutting roll having a diameter of 40 mm with effective cutting forces of 125 N/mm. - It is evident that in the central region of the cutting
roll 22 there is an upward excursion of ca. 40 μm. - If
FIGS. 6 and 7 are compared, then with regard to the corresponding inner cores of the cuttingroll 22 and thecounter roll 24 there would be in the central region a relative excursion of opposite-lying surface regions of the cuttingroll 22 and thecounter roll 24 of ca. 60 μm, if these surface regions were to follow the bowing of the inner cores. Such excursions, if present at the surface of thecounter roll 24 and the cuttingroll 22, impair the quality of the cutting result. - These disturbing excursions at the surfaces are in particular all the greater, the longer the cutting
roll 22 and thecounter roll 24 are and the smaller the diameter of these rolls is. - In the solution according to the invention, the
outer sleeve 60 is supported by means of thecounter bearings inner core 46. (This support may be provided both for the cuttingroll 22 and for thecounter roll 24 or only for the cuttingroll 22 or only for thecounter roll 24.) This allows forces during the cutting operation and in particular cutting forces to be introduced and removed in a defined manner. Via thecounter bearings outer sleeve 60 into theinner core 46 and therefore removed via thecorresponding pivot bearings 26 and/or 40. - Given a corresponding arrangement of the at least one counter bearing, the effect may be achieved that the
outer sleeve 60 is bent to a lesser extent than the correspondinginner core 46. This is indicated in a highly exaggerated manner inFIG. 8 . As a result of the cutting forces theinner core 46 experiences an elastic deformation and in particular bowing. Theouter sleeve 60 also experiences in principle an elastic deformation and bowing. By virtue of the supporting of theouter sleeve 60 on thecounter bearings outer sleeve 60 considerably lower than that of theinner core 46. This means that during the build-up of cutting forces a relative excursion and/or relative movement between theouter sleeve 60 and theinner core 46 is obtained. If theouter sleeve 60 is bent to a lesser extent than theinner core 46, then, in relation to the starting point with no effective cutting forces, thesurface 34 of the outer sleeve 60 (when it is a case of the outer sleeve of the counter roll 24) is bent to a lesser extent than theinner core 46. This means that the deviation of thesurface 34 of theouter sleeve 60 from the “ideal line” is less pronounced than if nodiscrete counter bearings surface 34 relative to the cuttingroll 22 is less pronounced and better cutting results are obtained. In particular, this also allows the use of longer counter rolls 24 of a smaller diameter. - The described advantages also exist when the cutting
roll 22 is mounted by an outer sleeve by means of discrete counter bearings on the corresponding inner core. If the cuttingroll 22 is also provided with the solution according to the invention, the result is an, as a whole, smaller relative excursion of the surfaces of the cuttingroll 22 and thecounter roll 24. - Depending on the individual application and in particular the configuration of the cutting
roll 22, one or more counter bearings are provided. These counter bearings are disposed and configured in such a way that a symmetrical flow of force arises at the cuttingroll 22 and/or thecounter roll 24. The flow of force is in this case in particular symmetrical relative to thecentre plane 66. - By virtue of the solution according to the invention a defined removal of the flow of force is obtained at the
counter roll 24 and/or the cuttingroll 22. This allows theouter sleeve 60 to deform elastically to a lesser extent than the correspondinginner core 46. This in turn means thatsurface regions 84 of the cutting roll 22 (if this is provided with one or more counter bearings) and/or of the counter roll 24 (if this is provided with one or more counter bearings) are deformed to a lesser extent than if theouter sleeve 60 was seated by its “full surface” on theinner core 46 and/or no outer sleeve at all was provided. - The
rotary cutting device 10 is for example configured in such a way that on the cuttingroll 22 cutting edges are disposed, which are arranged in a longitudinal direction (in relation to a longitudinal direction 86 (FIG. 1 ) for the conveying of material 44) and in a transverse direction thereto. - A second embodiment of a rotary cutting device according to the invention, which is shown in
FIG. 9 and denoted there by 88, comprises amachine frame 90, on which in basically the same manner as described above a cuttingroll 92 and acounter roll 94 are in each case rotatably mounted. Thecounter roll 94 is of basically the same design as thecounter roll 24 as described above. - The cutting
roll 92 is for example driven by a drive (not shown in the drawing). Disposed on ashaft stub 96 of the cutting roll is agear wheel 98, which meshes into agear wheel 100 that is fastened in a rotationally fixed manner relative to thecounter roll 94. Thus, by driving the cuttingroll 92 thecounter roll 94 can also be driven. - The cutting
roll 92 comprises afirst roll region 102 a and asecond roll region 102 b, wherein these tworoll regions first roll region 102 a and thesecond roll region 102 b in each case a plurality oftransverse cutting edges 104 are disposed. Thesetransverse cutting edges 104 are disposed in a uniformly distributed manner. For example, they are spaced apart by an angle of 120° (relative to a cross section). - The
transverse cutting edges 104 comprise acutting surface 106, which are transverse and in particular at right angles to a direction of conveying of material through therotary cutting device 88. In particular, the cutting surfaces 106 are oriented parallel to an axis ofrotation 108 of the cuttingroll 92. -
Counter bearings first roll region 102 a and thesecond roll region 102 b respectively. The counter bearing 110 a, 110 b in this case is of basically the same design as described above. In particular, these are annular regions that are disposed on a respectiveinner core 112 of the cuttingroll 92. - The
counter roll 94 likewise comprises aninner core 114, on which spaced-apartcounter bearings counter bearings counter bearings - Otherwise, the
rotary cutting device 88 operates in the manner described above. - In a third embodiment of a rotary cutting device, which is shown in
FIG. 11 and denoted there by 118, amachine frame 120 is provided. On the machine frame 120 a first pivot bearing 122 for acounter roll 124 is disposed. A second pivot bearing 126 is further disposed on themachine frame 120 at a distance from, for example above, the first pivot bearing 122. By means of this second pivot bearing 126 a cuttingroll 128 is rotatably mounted. The cuttingroll 128 and thecounter roll 124 are therefore in each case not mounted at two ends on themachine frame 120 but held only at one end in a “cantilevered” manner on themachine frame 120. - The cutting
roll 128 comprises for example oppositely-lying supporting rings 130 a, 130 b. By means of these supportingrings roll 128 is supported on asurface 132 of thecounter roll 124. A construction with no supporting ring is also possible. - The cutting
roll 128 is provided with cuttingedges 134. The cutting edges 134 are of a design adapted to the material to be cut. - The
counter roll 124 and the cuttingroll 128 comprise in each case, as described above, an inner core and respectiveouter sleeves outer sleeve 138 of the cuttingroll 128 in this case is supported by a single counter bearing 140 on the corresponding inner core of the cuttingroll 128. Theouter sleeve 136 of thecounter roll 124 is supported by a counter bearing 142 on the inner core of thecounter roll 124. Thecounter bearings - Otherwise, the
rotary cutting device 118 operates in the manner described above.
Claims (25)
1. Rotary cutting device, comprising:
a machine frame;
a cutting roll rotatably mounted on the machine frame; and
a counter roll mounted on the machine frame;
wherein at least one of the cutting roll and the counter roll comprise an inner core and an outer sleeve disposed around the inner core;
wherein the outer sleeve is spaced apart from the inner core; and
wherein on the inner core there is disposed at least one counter bearing, on which the outer sleeve is supported.
2. Rotary cutting device according to claim 1 , wherein the at least one counter bearing is disposed and configured in a way that allows forces, which the cutting roll and counter roll exert on one another, to be guided away in a defined manner by means of the at least one counter bearing on at least one of the counter roll and cutting roll.
3. Rotary cutting device according to claim 1 , wherein the at least one counter bearing is disposed and configured in such a way that the outer sleeve is movable by elastic deformation relative to the inner core.
4. Rotary cutting device according to claim 1 , wherein the at least one counter bearing is disposed and configured in such a way that during the cutting operation a bowing of the outer sleeve is smaller than a bowing of the inner core.
5. Rotary cutting device according to o claim 1 , wherein outside of the at least one counter bearing between the outer sleeve and the inner core an intermediate space is formed.
6. Rotary cutting device according to claim 1 , wherein between adjacent counter bearings an intermediate space is formed.
7. Rotary cutting device according to claim 1 , wherein the at least one counter bearing is disposed and configured in such a way that there arises at least one of the cutting roll and counter roll during the cutting operation an at least approximately symmetrical distribution of the flow of force in relation to at least one of the cutting roll length and counter roll length.
8. Rotary cutting device according to claim 1 , wherein the at least one counter bearing comprises an annular region that is disposed on the inner core.
9. Rotary cutting device according to claim 8 , wherein a width of the annular region is at most 30% of the total length of at least one of the counter roll and cutting roll.
10. Rotary cutting device according to claim 1 , wherein the outer sleeve is fixed on the at least one counter bearing.
11. Rotary cutting device according to claim 1 , wherein at least one seal is disposed between the outer sleeve and the inner core.
12. Rotary cutting device according to claim 11 , wherein the at least one seal is disposed on the end face of the outer sleeve.
13. Rotary cutting device according to claim 1 , wherein the at least one counter bearing is disposed symmetrically on at least one of the cutting roll and counter roll.
14. Rotary cutting device according to claim 1 , wherein one or more cutting edges are disposed on the outer sleeve of the cutting roll.
15. Rotary cutting device according to claim 1 , wherein, where the cutting roll and the counter roll are each provided with at least one counter bearing, counter bearings lie opposite one another.
16. Rotary cutting device according to claim 1 , wherein the cutting roll is supported on the counter roll by means of at least one supporting ring.
17. Rotary cutting device according to claim 16 , wherein a first supporting ring and a second supporting ring are provided, wherein the at least one counter bearing is disposed on at least one of the counter roll and cutting roll between the first supporting ring and the second supporting ring.
18. Rotary cutting device according to claim 1 , wherein the counter roll is rotatably mounted.
19. Rotary cutting device according to claim 1 , wherein the cutting roll is mounted at two ends on the machine frame.
20. Rotary cutting device according to claim 19 , wherein the counter roll is mounted at two ends on the machine frame.
21. Rotary cutting device according to claim 1 , wherein the cutting roll is mounted at one end on the machine frame.
22. Rotary cutting device according to claim 21 , wherein the counter roll is mounted at one end on the machine frame.
23. Rotary cutting device according to claim 1 , wherein one or more transverse cutting edges are disposed on the cutting roll.
24. Rotary cutting device according to claim 1 , wherein one or more longitudinal cutting edges are disposed on the cutting roll.
25. Rotary cutting device according to claim 1 , wherein the inner core and the outer sleeve form a unit that is rotatably held on the machine frame, with the inner core and the outer sleeve non-rotatable with regard to each other.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
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US13/621,886 US20130036889A1 (en) | 2007-03-30 | 2012-09-18 | Rotary cutting device |
Applications Claiming Priority (2)
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DE200710016451 DE102007016451A1 (en) | 2007-03-30 | 2007-03-30 | A rotary knife |
DE102007016451.5 | 2007-03-30 |
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US13/621,886 Continuation US20130036889A1 (en) | 2007-03-30 | 2012-09-18 | Rotary cutting device |
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US13/621,886 Abandoned US20130036889A1 (en) | 2007-03-30 | 2012-09-18 | Rotary cutting device |
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US20180133919A1 (en) * | 2016-11-15 | 2018-05-17 | Cloud Packaging Solutions Llc | Machine for cutting pouches with shaped perimeter edge, method and pouch |
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WO2014019619A1 (en) | 2012-08-01 | 2014-02-06 | Marbach Werkzeugbau Gmbh | Cylinder arrangement for processing material webs having a mixing device for mixing a temperature-control fluid |
EP3246138B1 (en) * | 2016-05-16 | 2020-05-06 | Tetra Laval Holdings & Finance S.A. | A cutting system, and a method for cutting a web or sheet of material |
EP3246139B1 (en) * | 2016-05-16 | 2020-09-30 | Tetra Laval Holdings & Finance S.A. | A cutting tool and a method for cutting a web or sheet of material |
EP3246140B1 (en) * | 2016-05-16 | 2019-06-26 | Tetra Laval Holdings & Finance S.A. | Cutting unit and method for cutting |
DE102018112310A1 (en) | 2018-05-23 | 2019-11-28 | Aichele Werkzeuge Gmbh | Rotary cutting apparatus and method of operating a rotary cutter |
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- 2007-03-30 DE DE200710016451 patent/DE102007016451A1/en not_active Withdrawn
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2008
- 2008-03-12 DE DE200850001855 patent/DE502008001855D1/en active Active
- 2008-03-12 EP EP20080152648 patent/EP1974878B1/en active Active
- 2008-03-12 AT AT08152648T patent/ATE489207T1/en active
- 2008-03-18 US US12/077,532 patent/US20080237386A1/en not_active Abandoned
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Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20180133919A1 (en) * | 2016-11-15 | 2018-05-17 | Cloud Packaging Solutions Llc | Machine for cutting pouches with shaped perimeter edge, method and pouch |
US10974412B2 (en) * | 2016-11-15 | 2021-04-13 | Cloud Packaging Solutions Llc | Machine for cutting pouches with shaped perimeter edge, method and pouch |
Also Published As
Publication number | Publication date |
---|---|
DE502008001855D1 (en) | 2011-01-05 |
ATE489207T1 (en) | 2010-12-15 |
EP1974878A1 (en) | 2008-10-01 |
EP1974878B1 (en) | 2010-11-24 |
DE102007016451A1 (en) | 2008-10-02 |
US20130036889A1 (en) | 2013-02-14 |
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Legal Events
Date | Code | Title | Description |
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STCB | Information on status: application discontinuation |
Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION |