EP1651398A1

EP1651398A1 - Brush cylinder

Info

Publication number: EP1651398A1
Application number: EP05745728A
Authority: EP
Inventors: Karl Ruhland; Karl Waldeck
Original assignee: BHS Corrugated Maschinen und Anlagenbau GmbH
Current assignee: BHS Corrugated Maschinen und Anlagenbau GmbH
Priority date: 2004-05-26
Filing date: 2005-05-24
Publication date: 2006-05-03
Anticipated expiration: 2025-05-24
Also published as: WO2005118238A1; DE502005000449D1; ATE355942T1; US8468921B2; CN100398275C; US20070028741A1; CN1878643A; EP1651398B1

Abstract

The invention relates to a cutting device comprising a blade shaft (32), which is mounted to be rotatably driven about a blade shaft rotational axis (31) and supports at least one circular blade (34) and a brush cylinder (16), which is mounted to be rotatably driven about a brush cylinder rotational axis (15) and lies opposite the blade shaft (32). According to the invention, the brush cylinder (16) comprises shell segments (37) with a divided circular cross-section, which are situated on a cylinder core (17). Said shell segments comprise an outer face (39), an inner face (40) that faces the cylinder core (17), bristles that project from the outer face (39), torque-transfer elements (44, 45, 46) for transferring torque from the cylinder core (17) to the shell segments (37) and fixing elements (49, 51) for fixing the shell segments (37) to the cylinder core (17).

Description

Cutting device

The invention relates to a cutting device for producing cuts and / or slits in corrugated cardboard webs and to a shell which is part of a corresponding cutting device.

Corrugated webs are produced in corrugated cardboard plants and then cut to size. Among other things, longitudinal cuts are generated at predetermined positions. From EP 443 396 B1 it is known to arrange the driven circular knives on one side of a corrugated cardboard web in a longitudinal cutting device. On the opposite side there is a brush roller that supports the corrugated cardboard during the longitudinal cut and into which the circular knife can plunge at the same time. When the longitudinal cuts are produced, the bristles of the brush roller wear out, so that the entire brush roller 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.

The object is achieved by the features of claims 1 and 11. The essence of the invention consists in forming the brush roller in a cutting device from a cylindrical, rotatably mounted roller core, which is surrounded by shells with a partial circle cross section, in particular half shells. The shells have bristles on the outside. Means are provided on the inside to connect the shells to the roller core in a rotationally fixed manner. The shells also have means for attaching the shells to the roll core. This can be done by the fact that the shells are connected to one another or fixed on the roller core.

Further advantageous embodiments of the invention result from the subclaims.

Additional features and details of the invention result from the following description of five exemplary embodiments with reference to the drawing. Show it:

1 shows a cross section of a cutting device according to the invention in accordance with a first exemplary embodiment,

2 shows a cross section along the section line II-II in FIG. 1,

3 shows a section of the cross section according to FIG. 2,

4 is a cross-sectional view rotated by 90 ° according to section line IV-IV in FIG. 3,

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

6 a representation corresponding to FIG. 4 of a brush roller according to a second exemplary embodiment,

7 a representation corresponding to FIG. 5 of the brush roller according to the second embodiment, 8 is an enlarged detail of a top view of a brush roller according to a third embodiment,

9 shows a cross section of a brush roller according to a fourth exemplary embodiment,

10 is an enlarged detail of the bristles of the brush roller according to FIG. 9,

11 shows a section along the section line XI-XI in FIG. 9,

FIG. 12 shows an enlarged detail of the bristles of the brush roller according to FIG. 11, and

13 is an exploded view of a brush roller according to a fifth embodiment,

14 shows a longitudinal section of the brush roller according to FIGS. 13 and

15 shows a cross section along the section line XV-XV in FIG. 14.

A corrugated cardboard system has a generally known machine for producing single-sided corrugated cardboard webs, which is described, for example, in EP 0 687 552 A (corresponds to US Pat. No. 5,632,850), DE 195 36 007 A (corresponds to GB 2,305,675 A) or DE 43 05 158 AI is known, which reference is made to the details. It is possible that a cover sheet or one or more single-sided cover sheets and a cover sheet are laminated onto the single-sided corrugated sheet. The units for generating a corresponding, in Fig. 1st Corrugated sheet 1 shown are on the left, that is, upstream of a slitting-creasing station 2 shown in FIG. 1, which is supported against a machine base 3. The corrugated cardboard 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. Apart from two guide tables 9, 10, devices 5 and 6 are of identical design and comprise upper creasing tools 11 and lower creasing tools 12 which cooperate to creasing the corrugated cardboard. The creasing devices 5 and 6 are known for example from DE 197 54 799 A (corresponds to US 6,071,222) and DE 101 31 833 A. Two creasing devices 5, 6 and two cutting devices 7 and 8 are provided so that when changing the format of the corrugated cardboard sheets to be cut, one device can be moved to the new positions while the other device is still in engagement with the corrugated cardboard. Lane 1 is.

The cutting devices 7, 8, which, apart from the guide tables 13, 14 on which the corrugated cardboard web 1 is guided, are constructed identically, are described in more detail below. Each cutting device 7 or 8 has a brush roller 16 which is arranged above the corrugated cardboard web 1 and is rotatably mounted about a brush roller axis of rotation 15. The brush roller 16 has a roller core 17. The roller core 17 consists of a cylindrical, internally hollow roller core jacket 18 and roller flanges 21 fastened at both ends 19, 20 thereof. The roller flanges 21 have an annular cylindrical projection 22 which projects into the jacket 18 and is connected to the jacket 18. The projection 22 is connected to the outside by a Bottom 23 closed, from which a bearing journal 24 projects outwards in the center.

The brush roller 16 is supported on both sides opposite two supports 25, 26 which form a machine frame and which are supported against the base 3, the bearing journals 24 being supported in associated slide bearings 27 in the supports 25 and 26, respectively. The brush roller 16 can be driven in rotation by a motor 28 attached to the carrier 26. The motor 28 is connected to a control unit 30 via a control line 29.

Below the brush roller 16 and below the corrugated cardboard web 1 there is a knife shaft 32 which is rotatably mounted about a knife shaft axis of rotation 31. The knife shaft 32 is supported at the end in corresponding slide bearings 33 in the carriers 25 and 26. The axes of rotation 15 and 31 run parallel to one another. In relation to the transport direction 4, the axis of rotation 31 is located slightly downstream from the axis of rotation 15. Numerous disk-shaped circular knives 34 are arranged on the knife shaft 32 so that they rotate together with the knife shaft 32. The circular knives 34 can be displaced on the knife shaft 32 by a generally known, but not shown, displacement unit on the shaft 32. The knife shaft 32 is connected in a torque-transmitting manner to a motor 35 which is fixed in relation to the carrier 26. The motor 35 is connected to the control unit 30 via a control line 36.

A brush jacket 38 composed of individual shells 37, in the present case fourteen pairs of two shells 37 each, is fastened on the roller core 17. The shells 37 have the shape of a partial arc in cross section. In the present case it is a semicircular bow, which is why the shells 37 are also referred to as half shells. Two shells 37 belonging to each other collide 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 base body 57 in the form of a circular cylinder sector with an outside 39 facing outwards and an inside 40 facing the roller core 17. The shells 37 are made of plastic and have essentially the same thickness over the circumference. On the outside of each shell 37 there are radially outwardly projecting bristle bundles 41 connected to the shell 37. Each bristle bundle 41 consists of individual bristles, not shown in detail. A typical bristle bundle 41 has a cross section of approximately 5.5 mm at its base and widens conically in the radial direction. For example, each individual bristle has a diameter of 0.6 mm. The conical widening of the bristle bundles produces a substantially uniform distribution of bristle tips 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, the rows being arranged offset to one another. This can be seen more clearly 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 a length of approximately 20 mm in the present case. Depending on the dimensions of the circular knives 34 and the brush roller 16, other bristle lengths can of course also be used. 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 for supporting the corrugated cardboard web during cutting and into which the circular knife is used for cutting can penetrate. The term brush roller also includes rollers with a soft surface, for example made of rubber.

Circular, axially spaced, radially projecting, annular webs 42 are provided on the roll core jacket 18. Corresponding semicircular annular grooves 43 are provided on the inside 40 of the shell 37, into which the webs 42 engage. Two webs 42 are provided for each shell 37. The interlocking engagement of the webs 42 and the annular grooves 43 fixes the shells 37 on the roller core 17 in the axial direction, that is, along the axis of rotation 31. For tangential fixing of the shells 37 on the roller core 17, that is to say for fixing in the circumferential direction and torque transmission, bores 44 which are open to the outside are provided in the roller core 17 and each receive 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 hole 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 transmission means for transmitting a torque from the roller core 17 to the shells 37. Unlike in the form of a positive fit, the torque transmission means can also be created by frictional engagement between the roller core 17 and the shells 37. In this case pin 45 would not be required. At its front and rear ends in the axial direction, each shell 37 has slots 47 which are open in the circumferential direction and into which blind holes 48 which run radially from the outside open. The slots 47 are located on the circumferential ends of the shell 37, in the present case thus offset from each other by 180 °. Connection plates 49 with two bores 50 each are provided. To connect a first half-shell 37 to a second half-shell 37 opposite the first, a plate 49 is inserted halfway into the slot 47 and fixed by a pin 51 inserted 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 is also locked there by a pin 51. As can be seen in FIG. 5, two shells 37 lying opposite one another are connected at both axial ends of the shell 37 and on both sides, so that a total of four plates 49 are required for the connection, as shown in FIG. 5. Instead of platelets 49, elastic elements, such as springs, can also be used, which ensure that the two shells 37 lying opposite one another and to be connected to one another are prestressed against one another. In this way, there is no play between the two shells 37 even after prolonged operation, since both are pulled towards one another by the spring element.

The operation of the cutting devices 7, 8 and the replacement of the shells 37 are described below. If longitudinal cuts are to be made at certain positions in a corrugated cardboard web 1, the circular knives 34 are moved to the corresponding transverse positions in one of the two cutting devices 7 and 8 and then immersed in the corrugated cardboard web 1. Here, the circular knife 34 penetrates the corrugated sheet 1, so that a complete cut of the corrugated sheet 1 is guaranteed. So that the corrugated cardboard web 1 does not dodge, it is supported from above by the bristle bundle 41 of the brush roller 16. Here, the bristle bundle 41 is compressed flexibly. In the present case, the circular knife 34 is immersed about 5 mm into the about 20 mm long bristles. An advantage of supporting the corrugated cardboard web 1 with bristles is that the circular knives 34 can be used to cut at any transverse positions. The transverse positions of the knives 34 are based on the specifications for the corrugated cardboard sheets to be cut. The knives 34 are thus never blocked by a corresponding rigid counterhold. If a format change is to take place, the inactive knives are moved into a new position and immersed in the corrugated cardboard web 1, while the knives that are still active are pulled out of the corrugated cardboard web 1.

The interaction of the knives 34 with the bristle bundle 41 causes them to wear and increasingly wear out. After a certain time, the bristles must be replaced. For this purpose, the roller core 17 can remain in the associated bearings 27. Unlike the solutions of the prior art, it is not necessary to remove the entire brush roller from the bearings in order to replace the brush part. The brush jacket 38 consisting of the individual shells 37 is removed by pulling the pins 51, as a result of which opposing shells 37 can be removed from the roller core 17, as is shown in the exploded view in FIG. 5. This can be done for all shells 37. Then new shells 37 with as yet unused bristles are assembled in exactly the opposite way. This means that 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 with the first via the plates 49 and the pins 51. The exchange of the shells 37 and thus of the entire brush casing 38 is thus possible in a simple and cost-efficient manner without the roller core 17 having to be removed from its bearings and the entire environment. A second exemplary embodiment of the invention is described below with reference to FIGS. 6 and 7. Structurally identical parts are given the same reference numerals as in the first exemplary embodiment, to the description of which reference is hereby made. Structurally different, but functionally similar parts are given the same reference numerals with a suffix a. The essential difference compared to the first exemplary embodiment is that, unlike in the first exemplary embodiment, the webs 42a are not designed to run all the way round, but instead have an interruption 52 on two opposite sides, where no web 42a is arranged. The webs 42a thus consist of two sections 55 and 56 which are not connected to one another and have a central angle of less than 180 °, in particular approximately 170 °. Correspondingly, annular groove sections 53 with a central angle of less than 90 ° are provided on the inside 40 of the shell 37a. Between two annular groove sections 53 located on the same circumference there remains a web 54 projecting relative to the bottom of the grooves 53. The interrupted webs 42a engage in the annular groove sections 53. This also applies in particular to the remaining web 54, which engages in the interruption 52 of the web 42a. This gives each shell 37a a tangential fixation, so that a torque transmission from the roller core 17a to the brush jacket 38a is possible. In contrast to the first exemplary embodiment, the locking pins 45 are not required here. The brush jacket 38a is exchanged as in the first exemplary embodiment. A third exemplary embodiment of the invention is described below with reference to FIG. 8. Structurally identical parts are given the same reference numerals as in the first exemplary embodiment, to the description of which reference is hereby made. Structurally different, but functionally similar parts are given the same reference symbols with a trailing b. As in the first exemplary embodiment, two 180 ° half-shells 37b are provided at a level of the brush roller 16, which completely surround the roller core 17. As in the first exemplary embodiment, the bristle bundle 41 protrudes normally radially from the axis 15. In contrast to the first exemplary embodiment, two half-shells belonging to one another do not collide along a straight parallel gap 58. Rather, a meandering or serpentine or zigzag gap 58b is provided. The end faces 59, 60 of the two shells 37b which define the gap 58b are designed such that they engage in one another in an alternating or finger-like manner. The bristle bundles 61 and 62 arranged in the area of the end faces 59 and 60 are located in the area of the respective projections 63 and 64 of the end faces 59 and 60. As a result, the distance between immediately adjacent bristle bundles 61 and 62 becomes different when the half-shells 37b are joined together Half-shells 37b reduced so that the bristle bundles 61 and 62 cover the gap 58b as well as possible, and thus the most uniform support behavior of the corrugated cardboard web 1 is achieved during the rotation of the brush roller 16. For the support of the corrugated cardboard web 1, it therefore plays a significantly smaller role whether the bristle bundle 41 is located somewhere 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 at least partially located on the projection. This means that the edge of the bristle bundle 61 facing the end face 59 protrudes from the adjacent recesses of the same end face 59. By placing the bundle of bristles 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, with a constant minimum edge distance from the end face 59 can be held so as not to impair the attachment of the bristle bundle 61 in the ground.

A fourth exemplary embodiment of the invention is described below with reference to FIGS. 9 to 12. Structurally identical parts are given the same reference numerals as in the first exemplary embodiment, to the description of which reference is hereby made. Structurally different, but functionally similar parts are given the same reference numerals followed by a c. The difference compared to the first exemplary embodiment is that the bristle bundles 61c and 62c, which adjoin the gap 58 between the two half-shells 37c, do not run radially outwards with respect to the axis 15, but at an angle b in the direction of the Gap 58 are inclined. The following applies: 1 ° <b <15 °, in particular 2 ° <b <10 °, in particular b ~ 5 °. The next bristles adjoining the bristle bundles 61c and 62c can also be arranged obliquely in the direction of the gap 58. The inclined arrangement described above can apply to the bristle bundles as a whole and to the individual bristles. The advantage achieved in this way is that, as in the third exemplary embodiment, the gap 58 is better covered and the function of the brush roller 16 is equally good over the circumference at any point.

Since the half-shells 37 not only meet tangentially in the area of the gaps 58, but also in the axial direction, ie along the axis of rotation 15, the bristles 65 are also there in the area of the axial end faces 66 of the half-shells 37 Angle b slanted 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 also better covered. A fifth embodiment of the invention will be described below with reference to FIGS. 13 to 15. Structurally identical parts are given the same reference numerals as in the first exemplary embodiment, to the description of which reference is hereby made. Structurally different, but functionally similar parts are given the same reference numerals with a suffix d. The main difference from the first exemplary embodiment is how the half-shells 37d are fastened on the roller core 17d. As in the first exemplary embodiment, the roller core 17d has radially projecting ring webs 42d which engage in the associated ring grooves 43d in the half-shells 37d and in this way fix the half-shells 37d in the axial direction. The axial edges 67 of the ring grooves 43 d are chamfered in order to facilitate demolding of the plastic part 37 d. In principle, however, it is possible to design the edges 67 to run perpendicular to the axis 15. A corresponding recess formed as an annular groove 68 is provided between two ring webs 42d on the roller core 17d. This has two bores 44d, which are arranged on diametrically opposite sides and into which pins 45d are inserted, for example by press fit or by screw connection. Each half-shell 37d has in its two end faces 59, 60 in the middle a half blind bore hole 46d that is open towards the outside. The half blind bores 46d of two adjacent half-shells 37d enclose the pin 45d in the assembled state. A bore 69 is provided in the middle between two opposite pins 45d, which are at the same axial height, that is to say offset by 90 ° to them. A threaded insert 70 is screwed into this and has an external thread and an internal thread. The threaded insert 70 is a standard component. The threaded insert 70 has domes 71 which project radially outwards and which, after the threaded insert 70 has been screwed in completely, into the bore 69 in rieh device to be driven on the axis 15. The domes 71 destroy part of the internal thread in the bore 69 of the aluminum roller core 17d, as a result of which the threaded insert 70 is permanently fixed in the bore 69. Each half-shell 37d has a continuous bore 72 in the middle between the end faces 59 and 60 and also in the middle in the axial direction. The Bohmng 72 has an internal thread 73, for example of the type M8. The threaded insert 70 has an internal thread 74 of the M12 type. 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 73 d. A threaded pin 75 is provided to match the two threads 73, 74, with an outer threaded portion 76 that fits the thread 73 and an inner threaded portion 77 of smaller diameter that fits the inner thread 74.

As described in the exemplary embodiment according to FIG. 9, the bristle bundles 41 are inclined towards one another in the region of the gap 58 by an angle b> 0 °. This can also apply to the bristles in the area of the axial end faces 66.

The assembly of the half-shells 37d is described below. First, the pins 45d are fixed in the associated bores 44d. The set screw 75 with the outer threaded section 76 is then screwed into the bore 72 in a half-shell 37d as far as it will go. The half-shell 37d is then placed on the roller core 18d, the pins 45d engaging with the blind holes 46d which are open on one side and fixing the half-shell 37d in a specific position on the core 18d. Subsequently, the set screw 45, which has an internal hexagon at the outer end, with an associated tool is passed through the bore 72 from the outside. by screwing with the inner threaded portion 77 into the inner 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 grub screw 75 rotates into 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 roller 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 area of the two bores 69 and 72 in the radial direction when the half-shell 37d is placed on the roller core 18d. This gap is then closed when screwing in the threaded pin 75. The dismantling of the half-shell 37d is correspondingly simple.

Claims

claims

1. Cutting device which is arranged in a running path of a corrugated cardboard web (1) continuously produced by a corrugated cardboard manufacturing machine, which cutting device comprises a. a knife shaft (32) which is rotatably driven about a knife shaft axis of rotation (31) and carries at least one circular knife (34), and b. a brush roller (16; 16a; 16d) which is rotatably mounted about an axis of rotation of the brush roller (15) and is arranged opposite the knife shaft (32) for supporting the corrugated cardboard web guided between the knife shaft (32) and the brush roller (16; 16a; 16d) (1) when cutting the corrugated cardboard web (1) with the at least one circular knife (32), c. wherein the brush roller (16; 16a; 16d) has shells (37; 37a; 37b; 37c; 37d) which are arranged on a roller core (17; 17a; 17d) and which are partially circular in cross section and which have i. an outside (39) and an inside (40) facing the roll core (17; 17a; 17d), ii. bristles protruding from the outside (39), iii. Torque transmission means (44, 45 46; 52, 54; 75) for transmitting a torque from the roll core (17; 17a; 17d) to the shells (37; 37a; 37b; 37c; 37d), and iv. Fastening means (49, 51; 75) for fastening the shells (37; 37a; 37b; 37c; 37d) on the roller core (17; 17a).

2. Cutting device according to claim 1, characterized in that the shells (37; 37a; 37b; 37c; 37d) are designed as half-shells.

3. Cutting device according to claim 1 or 2, characterized in that the shells (37; 37a; 37b; 37c; 37d) form a closed brush jacket (38; 38a) on the roller core (17; 17a).

4. Cutting device according to one of the preceding claims, characterized in that on the roll core (17; 17a; 17d) at least over part of the circumference radially projecting, annular webs (42; 42a; 42d) are provided.

5. Cutting device according to claim 4, characterized in that on the inside (40) of the shells (37; 37a; 37b; 37c; 37d) annular grooves (43; 53; 43 d) are provided which are connected to the webs ( 42; 42a; 42d) for axially fixing the shells (37; 37a; 37b; 37c; 37d) and / or for tangentially fixing the shells (37; 37a; 37b; 37c; 37d).

6. Cutting device according to one of the preceding claims, characterized in that in the roller core (17; 17d) and on the inside (40) of the shells (37; 37d) Bohmngen (44, 46; 69, 72) for receiving a connecting pin (45; 75) are provided for the rotationally fixed connection of the shell (37; 37d) to the roller core (17; 17d).

7. Cutting device according to one of the preceding claims, characterized in that a first shell (37) a first fastening means and a second shell (37) a second fastening means for connecting the first shell (37) to the second shell (37) on the roller core (17).

8. Cutting device according to one of the preceding claims, characterized in that the bristle bundles (61c, 62c, 65) are inclined towards the respective end in the region of the axial or tangential ends of the shells (37c; 37d), in particular with a radius an angle b Include> 0 °.

9. Cutting device according to one of the preceding claims, characterized in that two adjacent shells (37b) engage in a finger-like manner in the region of their respective tangential ends.

10. Cutting device according to claim 6, characterized in that the connecting pin (75) has two threaded sections (76, 77) with different pitches.

11. Shell for use in a cutting device according to one of the preceding claims for attachment to a roller core (17; 17a; 17d), the shell having a. a base body (57; 57a) which is partially circular in cross section, b. an outside (39) and an inside (40), c. bristles protruding outwards from the outside (40), d. Torque transmission means (44, 45, 46; 52, 54; 75) for transmitting a torque from the roll core (17; 17a; 17d) to the body (57; 57a), and e. Fastening means (49, 51; 75) for fastening the base body (57; 57a) on the roller core (17; 17a; 17d).