EP1651398B1 - Brush cylinder - Google Patents

Abstract

A cutting arrangement comprises a blade shaft (32) which is mounted for drivable rotation about a blade-shaft axis of rotation (31) and which has at least one circular blade (34); and a brush roll (16) which is disposed opposite the blade shaft (32) and mounted for rotation about a brush-roll axis of rotation (15); the brush roll (16) possessing shells (37) in the cross-sectional shape of a segment of a circle which are disposed on a roll core (17) and which have an outside (39) and an inside (40) that is turned towards the roll core (17), bristles that stand out from the outside (39), torque-transmission components (44, 45, 46) for transmitting torque from the roll core (17) to the shells (37), and fastening components (49, 51) for fixing the shells (37) to the roll core (17).

Description

The invention relates to a cutting device for producing cuts and / or slits in paperboard webs and a shell which is part of a corresponding cutting device, according to the preamble of claims 1 and 8.

In corrugated board plants, corrugated webs are produced and then cut to size. Among other things, longitudinal sections are generated at predetermined positions.

From DE 2 225 152 A1 such a device or shell for cutting corrugated webs in longitudinal strips is known.

From EP 443 396 B1 it is known to arrange the driven circular knives on one side of a corrugated web in a longitudinal cutting device. On the opposite side is a brush roller, which supports the corrugated board in the longitudinal section and in the same time the circular blade can dip in the cut.

Brush rollers are also known from US 3,618,436, US 3,604,302 and US 3,942,210.

Half shells and their compounds are known from US 3,285,642 and WO 02/102 558.

Finally, from US 5,378,051 a method is known to produce brush elements for a brush roller.

When generating the longitudinal cuts occur wear of the circular blade and the opposite brush rollers, so that the brush rollers must be replaced at regular intervals. This is time consuming and costly.

The invention has for its object to provide a simplified cutting device for corrugated webs, which allows easy replacement of the brush rollers.

The object is solved by the features of claims 1 and 8. The core of the invention is to form the brush roller of a cylindrical, rotatably mounted roller core in a cutting device, which is surrounded by shells with part-circle cross section, in particular half shells. The bowls carry on their outside bristles. On the inside means are provided to connect the shells with the roller core rotatably. The cups also include means for securing the cups to the roll core. This can be done by that the shells are fixed on the roll core.

Further advantageous embodiments of the invention will become apparent from the dependent claims.

Fig. 1

einen Querschnitt einer Schneidvorrichtung,

Fig. 2

einen Querschnitt der Schneidvorrichtung gemäß der Schnittlinie II-II in Fig. 1,

Fig. 3

einen Ausschnitt einer Bürstenwalze aus der gleichen Perspektive wie in Fig. 2,

Fig. 4

eine um 90° gedrehte Querschnittsdarstellung einer Bürstenwalze gemäß der Schnittlinie IV-IV in Fig. 3,

Fig. 5

eine Explosionsdarstellung einer Bürstenwalze gemäß Fig. 2 ohne Bürsten,

Fig. 6

eine Fig. 4 entsprechende Darstellung einer weiteren Bürstenwalze,

Fig. 7

eine Fig. 5 entsprechende Darstellung der in Fig. 6 gezeigten Bürstenwalze,

Fig. 8

eine Ausschnittvergrößerung einer Draufsicht auf eine erfindungsgemäße Bürstenwalze,

Fig. 9

einen Querschnitt einer Bürstenwalze gemäß einem weiteren Ausführungsbeispiel,

Fig. 10

eine Ausschnittvergrößerung der Borsten der Bürstenwalze gemäß Fig. 9,

Fig. 11

einen Schnitt gemäß der Schnittlinie XI-XI in Fig. 9,

Fig. 12

eine Ausschnittvergrößerung der Borsten der Bürstenwalze gemäß Fig. 11, und

Fig. 13

eine Explosionsdarstellung einer Bürstenwalze gemäß einem weiteren Ausführungsbeispiel,

Fig. 14

ein Längsschnitt der Bürstenwalze gemäß Fig. 13 und

Fig. 15

einen Querschnitt gemäß der Schnittlinie XV-XV in Fig. 14.

Additional features and details of the invention will become apparent from the following description of various embodiments with reference to the drawings. Show it:

Fig. 1

a cross section of a cutting device,

Fig. 2

a cross section of the cutting device according to the section line II-II in Fig. 1,

Fig. 3

a section of a brush roller from the same perspective as in Fig. 2,

Fig. 4

a 90 ° rotated cross-sectional view of a brush roller according to the section line IV-IV in Fig. 3,

Fig. 5

an exploded view of a brush roller according to FIG. 2 without brushes,

Fig. 6

4 a representation corresponding to another brush roller,

Fig. 7

5 a representation of the brush roller shown in FIG. 6, FIG.

Fig. 8

a detail enlargement of a plan view of a brush roller according to the invention,

Fig. 9

a cross section of a brush roller according to another embodiment,

Fig. 10

a detail enlargement of the bristles of the brush roller of FIG. 9,

Fig. 11

a section along the section line XI-XI in Fig. 9,

Fig. 12

a detail enlargement of the bristles of the brush roller of FIG. 11, and

Fig. 13

an exploded view of a brush roller according to another embodiment,

Fig. 14

a longitudinal section of the brush roller of FIG. 13 and

Fig. 15

a cross section along the section line XV-XV in Fig. 14.

FIGS. 3-7 do not represent embodiments of the brush rollers according to the invention, but merely serve to explain the embodiments according to the invention according to FIGS. 8-15.

A corrugated board installation has a generally known machine for producing single-sided corrugated webs, which is known, for example, from EP 0 687 552 A (corresponding to US Pat. No. 5,632,850) DE 195 36 007 A (corresponding to GB 2,305,675 A) or DE 43 05 158 A 1 is known, to which reference is made for details. It is possible that a cover sheet or one or more one-sided laminated corrugated board webs and a cover sheet are laminated on the single-faced corrugated cardboard web. The units for generating a corresponding, in Fig. 1st shown corrugated web 1 are on the left, that is upstream of a longitudinal cutting / creasing station 2 shown in Fig. 1, which is supported against a machine base 3. The corrugated web 1 is transported along a transport direction 4. The longitudinal cutting / creasing station 2 has four units along the direction 4, namely a first creasing device 5, a second creasing device 6, a first cutting device 7 and a second cutting device 8. The creasing devices 5 and 6 are identical except for two guide tables 9, 10 and include upper creasing tools 11 and lower creasing tools 12 which cooperate to flute the corrugated board. The creasing devices 5 and 6 are known, for example, from DE 197 54 799 A (corresponding to US Pat. No. 6,071,222) and DE 101 31 833 A. In each case, two scoring devices 5, 6 and two cutting devices 7 and 8 are provided, so that a device can be moved to the new positions during a format change of the corrugated cardboard sheets to be cut, while the respective other device is still in engagement with the corrugated board. Lane 1 is.

In the following, the cutting devices 7, 8, which are identically constructed apart from the guide tables 13, 14, on which the corrugated web 1 is guided, are described in more detail. Each cutting device 7 or 8 has a brush roller 16, which is arranged above the corrugated web 1 and is rotatable about a brush roller rotation axis 15. The brush roller 16 has a roller core 17. The roller core 17 consists of a cylindrical, inner hollow roller core shell 18 and at both ends 19, 20 of the same fixed roller flanges 21. The roller flanges 21 have a protruding into the jacket 18, annular cylindrical projection 22 which is connected to the jacket 18. The projection 22 is on the outside by an associated Bottom 23 is closed, from the outside center of a bearing pin 24 protrudes.

The brush roller 16 is on both sides against two, a machine frame-forming supports 25, 26 which are supported relative to the bottom 3, stored, wherein the bearing pins 24 are mounted in associated slide bearings 27 in the carriers 25 and 26 respectively. The brush roller 16 is rotatably driven via a motor 28 fixed to the carrier 28. The motor 28 is connected via a control line 29 to a control unit 30.

Below the brush roller 16 and underneath the corrugated web 1 there is a blade shaft 32 rotatably mounted about a knife shaft axis of rotation 31. The blade shaft 32 is mounted endwise in corresponding plain bearings 33 in the supports 25 and 26. The axes of rotation 15 and 31 are parallel to each other. Relative to the transport direction 4, the axis of rotation 31 is slightly downstream of the axis of rotation 15. Numerous disc-shaped circular blade 34 are rotatably arranged on the blade shaft 32 so that they rotate together with the blade shaft 32. The circular blades 34 are on the blade shaft 32 by a well-known, but not shown, sliding unit on the shaft 32 slidably. The knife shaft 32 is connected in a torque-transmitting manner with a motor 35 which is fixed relative to the carrier 26. The motor 35 is connected via a control line 36 to the control unit 30.

On the roll core 17, a single shell 37, in the present case fourteen pairs of two shells 37, composite brush jacket 38 is attached. The shells 37 have the shape of a partial arc in cross section. In this case, it is a semicircular arc, why the shells 37 are also referred to as half shells. Two mutually associated shells 37 abut each other along two straight parallel columns 58. It is also possible to provide more than two shells, for example three shells each with a center angle of 120 °, over the circumference of the roller core 17. The shells 37 have a main body 57 in the form of a circular cylinder sector with an outwardly facing outer side 39 and an inner surface 40 facing the roller core 17. The shells 37 are made of plastic and have the circumference substantially the same thickness. On the outside of each shell 37 are radially outwardly projecting, connected to the shell 37 bristle bundles 41. Each bristle bundle 41 consists of individual, not shown in detail bristles. A typical bundle of bristles 41 has a cross section of about 5.5 mm at its base and widens conically in the radial direction. Each individual bristle has, for example, a diameter of 0.6 mm. Due to the conical expansion of the bristle bundles, a substantially uniform distribution of bristle tips is produced on the outer surface of the brush roller 16. The bristle bundles 41 are arranged in rows running parallel to the axis of rotation 15, wherein the rows are arranged offset to one another. This can be seen in more detail in FIG. 13. The bristles of the bristle bundles 41 are flexible and consist for example of polyamide. The bristle bundle 41 covers the outside 39 flat. The bristle bundle 41 has in the present case a length of about 20 mm. Of course, other bristle lengths can be used in accordance with the dimensions of the circular blade 34 and the brush roller 16. In Fig. 5, the shells 37 are shown for simplicity without bristle bundle 41. The term brush roller is used in this application in the broadest sense as any roller which is suitable to support the corrugated web during cutting and in the cutting blade when the circular blade can penetrate. The term brush roller thus also includes rollers with a soft, for example made of rubber surface.

On the roll core jacket 18 are circumferential, axially spaced from each other, radially projecting annular webs 42 are provided. On the inside 40 of the shell 37 corresponding semicircular annular grooves 43 are provided, into which the webs 42 engage. For each shell 37 two webs 42 are provided. Due to the positive engagement of the webs 42 and the annular grooves 43, the shells 37 are fixed on the roller core 17 in the axial direction, that is to say along the axis of rotation 31. For tangential fixation of the shells 37 on the roll core 17, that is, for fixing in the circumferential direction and torque transmission, holes are provided in the roll core 17 outwardly open 44, each receiving a locking pin 45, which after insertion into the bore 44 in the radial direction protrudes from the roller core 17. In the present case, a locking pin 45 is provided for each shell 37. Two locking pins 45 are thus opposite to each other with respect to the axis 15. On the inside 40 of each shell 37, an inwardly open blind bore 46 is provided, in each of which a locking pin 45 engages and locks the shell 37 in the circumferential direction. The locking pin 45 thus acts as a torque transfer means for transmitting a torque from the roller core 17 to the shells 37. Other than by positive engagement, the torque-transmitting means can also be provided by frictional engagement between the roller core 17 and the shells 37. In this case, the pin 45 would not be required. Each shell 37 has at its front and rear end in the axial direction in the circumferential direction open slots 47, in the radially outwardly inwardly extending blind holes 48 open. The slots 47 are located at the circumferential ends of the shell 37, are in the present case So offset by 180 ° to each other. There are connection plates 49 each provided with two holes 50. To connect a first half-shell 37 with a second, the first opposing half-shell 37, a small plate 49 is inserted in half in the slot 47 and fixed by a pin 51 pushed into the blind bore 48 from the outside. The other half of the plate 49 is inserted into the opposite slot 47 of the other shell 37 and there also locked by a pin 51. 5, at both axial ends of the shell 37 and on both sides, so that for connection, as shown in Fig. 5, a total of four plates 49 are required. In place of platelets 49, elastic members, such as springs, may be used to ensure that the two opposed shells 37 to be joined together are biased against each other. In this way, even after prolonged operation, there is no play between the two shells 37, since both are pulled towards each other by the spring element.

The operation of the cutting devices 7, 8 and the replacement of the shells 37 will now be described. If longitudinal cuts are to be made in a corrugated web 1 at specific positions, then in one of the two cutting devices 7 or 8 the circular knives 34 are moved to the corresponding transverse positions and then immersed in the corrugated web 1. Here, the circular blade 34 penetrates the corrugated web 1, so that a complete severing of the corrugated web 1 is ensured. So that the corrugated web 1 does not yield, it is supported from above by the bristle bundle 41 of the brush roller 16. Here, the bristle bundle 41 is flexibly compressed. In the present case, the circular blade 34 dives about 5 mm into the approximately 20 mm long bristles. An advantage of the support of the corrugated web 1 by bristles is that can be cut at any transverse positions with the circular knives 34. The transverse positions of the blades 34 are based on the specifications for the corrugated sheets to be cut. The blades 34 are thus never blocked by a corresponding rigid counter-stop. If a format change takes place, the inactive blades are moved to a new position and immersed in the corrugated web 1, while the still active blades are pulled out of the corrugated web 1.

Due to the interaction of the blades 34 with the bristle bundle 41, they wear out and become increasingly worn. After a certain time, therefore, a renewal of the bristles is required. For this purpose, the roller core 17 may remain in the associated bearings 27. It is not necessary to remove the entire brush roller from the bearings to renew the brush part. The brush shell 38 consisting of the individual shells 37 is removed by pulling the pins 51, whereby respective opposite shells 37 are removable from the roller core 17, as shown in the exploded view in Fig. 5. This can be done for all shells 37. Subsequently, new shells 37 are mounted with unused bristles in exactly the reverse manner. This means that in each case a shell 37 is placed on the roller core 17, so that the locking pin 45 is seated in the bores 44 and 46. The associated second half-shell 37 is fixed to the first via the platelets 49 and the pins 51. The replacement of the shells 37 and thus of the entire brush casing 38 is thus simple and cost-effective, without the roller core 17 has to be removed from its bearings and the entire environment.

In the following, a further embodiment will be described with reference to FIGS. 6 and 7. Structurally identical parts are given the same reference numerals as in the previous embodiment, to the description of which reference is hereby made. Structurally different but functionally similar parts receive the same reference numerals with a following a. The main difference with respect to the previous embodiment is that the webs 42a are not completely formed differently than in the previous embodiment, but have an interruption 52 on two opposite sides, where no web 42a is arranged. The webs 42a thus consist of two non-connected sections 55 and 56 with a center angle of less than 180 °, in particular approximately 170 °. Accordingly, on the inside 40 of the shell 37a annular groove portions 53 are provided with a center angle of less than 90 °. Between two on the same circumference annular groove portions 53 remains a relatively projecting to the bottom of the grooves 53 web 54. The interrupted webs 42 a engage in the annular groove portions 53 a. This is especially true for the remaining web 54, which engages in the interruption 52 of the web 42a. As a result, each shell 37a receives a tangential fixation, so that a torque transmission from the roller core 17a to the brush casing 38a is possible. Unlike the previous embodiment, the locking pins 45 are not required here. The replacement of the brush jacket 38a is the same as in the previous embodiment.

In the following, an embodiment of the invention will be described with reference to FIG. Structurally identical parts are given the same reference numerals as in the previous embodiment, to the description of which reference is hereby made. Structurally different, but functionally similar parts receive the same reference numerals with a trailing b. As in the previous embodiment 16 two 180 ° half shells 37 b are provided at a height of the brush roller, which completely surround the roller core 17. The bristle bundle 41 is normal radially from the axis 15 as in the previous embodiment. Unlike the previous embodiment, however, two mutually associated half shells do not collide with each other along a straight parallel gap 58. Rather, a meandering or serpentine or zigzag gap 58b is provided. The gap 58 b defining end surfaces 59,60 of the two shells 37b are formed so that they engage alternately or finger-like into one another. The arranged in the region of the end faces 59 and 60 bristle bundles 61 and 62 are located in the region of the respective projections 63 and 64 of the end faces 59 and 60. In this way, when joining the half-shells 37b, the distance of immediately adjacent bristle bundles 61 and 62 different Semi-shells 37b reduced, so that the bristle bundles 61 and 62 cover the gap 58b as well as possible and thus the rotation of the brush roller 16 as uniform as possible support behavior of the corrugated web 1 is achieved. Thus, for supporting the corrugated web 1, it plays a considerably less important role whether the bristle bundles 41 are located anywhere on the surface of the shell 37b or in the vicinity of the gap 58b. In particular, each projection 63 or 64 is assigned its own bristle bundle 61 or 62, which is located at least partially on the projection. This means that the edge 59 of the bristle bundle 61 facing the end face 59 protrudes with respect to the adjacent recesses of the same end face 59. By placing the bristle bundle 61 at least partially on the projection 63, the distance to the two delimiting bristle bundles 62 of the adjacent half-shell can be minimized, wherein a constant minimum edge distance to the end face 59 is maintained can be so as not to affect the attachment of the bristle bundle 61 in the ground.

In the following, a further embodiment of the invention will be described with reference to FIGS. 9 to 12. Structurally identical parts receive the same reference numerals as in the embodiment according to FIGS. 3 to 5, to the description of which reference is hereby made. Structurally different, but functionally similar parts receive the same reference numerals with a c. The difference with respect to the embodiment according to FIGS. 3 to 5 is that the bundles of bristles 61 c and 62 c, which adjoin the gap 58 between the two half-shells 37 c, do not extend radially outwards relative to the axis 15, but around one Angles b are inclined in the direction of the gap 58. The following applies: 1 ° ≤ b ≤ 15 °, in particular 2 ° ≤ b ≤ 10 °, in particular b ≈ 5 °. It is also possible for the next bristles adjacent to the bristle bundles 61 c and 62 c to be arranged obliquely in the direction of the gap 58. The oblique arrangement described above can apply to the bundles of bristles overall as well as to the individual bristles. The advantage achieved thereby is that, as in the embodiment according to FIG. 8, the gap 58 is better covered and thus the function of the brush roller 16 over the circumference at each point is equally good.

Since the half shells 37 not only tangentially abut one another in the area of the gaps 58, but also in the axial direction, ie along the axis of rotation 15, the bristles 65 in the region of the axial end faces 66 of the half shells 37 are also at an angle b there placed obliquely outwards. In this way, the gaps between the end faces 66 of two half-shells 37 arranged one behind the other in the axial direction are better covered.

In the following, another embodiment of the invention will be described with reference to Figs. Structurally identical parts are given the same reference numerals as in the embodiment according to FIGS. 3 to 5, to the description of which reference is hereby made. Structurally different, but functionally similar parts receive the same reference numerals with a d followed. The main difference with respect to the embodiment according to FIGS. 3 to 5 is how the half-shells 37d are mounted on the roller core 17d. The roller core 17d has, as in the embodiment according to FIGS. 3 to 5, radially projecting annular webs 42d, which engage in associated annular grooves 43d in the half shells 37d and fix the half shells 37d in this way in the axial direction. The axial edges 67 of the annular grooves 43d are chamfered to facilitate demolding of the plastic part 37d. However, it is in principle possible to form the edges 67 running perpendicular to the axis 15. Between two ring webs 42 d on the roller core 17 d a corresponding formed as an annular groove 68 return is provided. This has two, arranged on diametrically opposite sides of holes 44d, are inserted into the pins 45d, for example by Pressitz or by screw. Each half-shell 37d has in its two end faces 59, 60 in the middle half a half outwardly open, half blind hole 46d. The half blind holes 46d of two adjacent half-shells 37d enclose the pin 45d in the mounted state. Centered between two opposite, lying on the same axial height pins 45d, that is offset by 90 ° to this, a bore 69 is provided. In this a threaded insert 70 is screwed, which has an external thread and an internal thread. The threaded insert 70 is a standard component. The threaded insert 70 has outwardly radially projecting spines 71, which after the complete screwing of the threaded insert 70 in the bore 69 in the direction be hit on the axis 15. The domes 71 destroy part of the internal thread in the bore 69 of the existing aluminum roll core 17 d, whereby the threaded insert 70 is permanently fixed in the bore 69. Each half-shell 37d has centrally between the end faces 59 and 60 and also centrally in the axial direction a through bore 72. The bore 72 has an internal thread 73, for example of the type M8. The threaded insert 70 has an internal thread 74 of type M 12. It is essential that the pitch of the internal thread 74 in the threaded insert 70 is greater than the pitch of the thread 73 in the half-shell 73d. Matching to the two threads 73, 74 is provided a threaded pin 75 having an outer threaded portion 76 which mates with the thread 73 and an inner threaded portion 77 of larger diameter which mates with the inner thread 74.

The bristle bundles 41 are, as described in the embodiment of FIG. 9, in the region of the gap 58 by an angle b> 0 ° inclined towards each other. This can also apply to the bristles in the region of the axial end faces 66.

The following describes the assembly of the half-shells 37d. First, the pins 45d are fixed in the corresponding holes 44d. Subsequently, the threaded pin 75 is screwed with the outer threaded portion 76 until it stops in the bore 72 in a half-shell 37d. Thereafter, the half-shell 37d is placed on the roll core 18d, the pins 45d engaging with the half-open blind holes 46d and fixing the half-shells 37d in a predetermined position on the core 18d. Following this, the threaded pin 75 having an inner hexagon at the outer end with an associated tool is passed through the bore 72 from the outside screwed with the inner threaded portion 77 in the internal thread 74 of the threaded insert 70. Since the pitch of the internal thread 74 in the threaded insert 70 is greater than the pitch of the thread 73 in the half-shell 37d, the set screw 75 rotates per revolution in the roller core 17d faster than it is unscrewed from the half-shell 37d. As a result, the half-shell 37d is tightened on the roll core 17d. To ensure that the threaded pin 75 is screwed into a sufficient number of threads in the threaded insert 70, a gap should remain in the radial direction in the region of the two bores 69 and 72 when the half-shell 37d is placed on the roller core 18d. This gap is then tightened when screwing the threaded pin 75. The disassembly of the half-shell 37d is correspondingly simple.

Claims (8)

1. A cutting arrangement which is disposed on a distance of travel of a web of corrugated board (1) that is continuously produced by a corrugating machine, the cutting arrangement comprising

   a. a blade shaft (32) which is mounted for drivable rotation about a blade-shaft axis of rotation (31) and which has at least one circular blade (34); and

   b. a brush roll (16; 16a; 16d) which is disposed opposite the blade shaft (32) and mounted for rotation about a brush-roll axis of rotation (15), supporting the web of corrugated board (1), which passes between the blade shaft (32) and the brush roll (16; 16a; 16d), when the web of corrugated board (1) is cut by the at least one circular blade (34);

   c. the brush roll (16; 16a; 16d) possessing shells (37; 37a; 37b; 37c; 37d) which are disposed on a roll core (17; 17a; 17d) and have a cross-sectional shape of a segment of a circle and which have

   i. an outside (39) and an inside (40) that is turned towards the roll core (17; 17a; 17d);

   ii. bristles which stand out from the outside (39);

   iii. torque-transmission means (44, 45, 46; 52, 54; 75) for transmitting torque from the roll core (17; 17a; 17d) to the shells (37; 37a; 37b; 37c; 37d); and

   iv. fastening means (49, 51; 75) for fixing the shells (37; 37a; 37b; 37c; 37d) to the roll core (17; 17a).

   d. in which holes (44, 46; 69, 72) are provided in the roll core (17; 17d) and on the inside (40) of the shells (37; 37d), respectively accommodating a fastening pin (45; 75) for non-rotary connection of the shell (37; 37d) with the roll core (17; 17d),
   characterized in that

   e. the fastening pin (75) comprises two threaded portions (76, 77) of different pitch.
2. A cutting arrangement according to claim 1, characterized in that the shells (37; 37a; 37b; 37c; 37d) are half-shells.
3. A cutting arrangement according to claim 1 or 2, characterized in that the shells (37; 37a; 37b; 37c; 37d) form a closed brush sleeve (38; 38a) on the roll core (17; 17a).
4. A cutting arrangement according to one of the preceding claims, characterized in that annular ribs (42; 42a; 42d) are provided on the roll core (17; 17a; 17d), which project radially at least along part of the periphery.
5. A cutting arrangement according to claim 4, characterized in that ring grooves (43; 53; 43d) are provided on the inside (40) of the shells (37; 37a; 37b; 37c; 37d), which cooperate with the ribs (42; 42a; 42d) for fixing the shells (37; 37a; 37b; 37c; 37d) axially and/or for fixing the shells (37; 37a; 37b; 37c; 37d) tangentially.
6. A cutting arrangement according to one of the preceding claims, characterized in that in the vicinity of the axial or tangential ends of the shells (37c; 37d), the bunches of bristles (61c, 62c, 65) incline towards the respective end, in particular combining with a radius to make an angle of b > 0°.
7. A cutting arrangement according to one of the preceding claims, characterized in that two adjacent shells (37b) interengage in the way of fingers in the vicinity of their respective tangential ends.
8. A shell for use in a cutting arrangement according to one of the preceding claims for being fixed to a roll core (17; 17a; 17d), the shell comprising

   a. a basic structure (57; 57a) in the cross-sectional shape of a segment of a circle;

   b. an outside (39) and an inside (40);

   c. bristles which project outwards from the outside (40);

   d. torque-transmission means (44, 45, 46; 52, 54; 75) for transmitting torque from the roll core (17; 17a; 17d) to the basic structure (57; 57a) a hole (72) for accommodating the fastening pin (75); and

   e. fastening means (49, 51; 75) for fixing the basic structure (57; 57a) to the roll core (17; 17a; 17d),
   characterized in that

   f. the fastening pin (75) comprises two threaded portions (76, 77) of different pitch.

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