EP0243748B1 - Device for winding up several small webs after longitudinally slitting a large web - Google Patents

Description

The invention relates to a device for winding a plurality of narrow material webs formed by longitudinally cutting a wide material web into supply rolls with guide rollers for the webs, with knives for longitudinally cutting the rear material web, with winding devices with winding cores for the narrow material webs, with a central, the narrow material webs on both sides In its running direction diverging guide roller each in a bogie rotatably mounted in the machine frame with turning drives provided with rotary drives are provided with two winding devices each, and each with the winding device arranged on the inside of the guide roller, each with a separating knife pivotally mounted in the machine frame with a pressure roller is.

Such a device is known for example from GB-A-932 151. In this known prior art, the winding cores are pivoted by the turning disks provided with rotary drives after completion of the web of material web. The turning disks and their corresponding rotary drive must be designed in such a way that the rather heavy finished material web windings can be pivoted from their winding position into the removal position.

From CH-A-370 682 a device for winding cotton webs is known, which is guided over a roller and wound onto a roller lying against it. The ends of the roller are displaceable in one axis in an oblique guide groove of two end guide disks. In this device, however, the guide disks have a different task than the generic turning disk. Other devices of the generic type are known for example from DE-B-14 74 243 and DE-U-82 33 364.

The object of the invention is to develop a generic device in such a way that with good winding quality of the supply rolls wound from the narrow material webs, a roll change with simple handling is permitted without interrupting the continuous web feed.

According to the invention, this object is achieved in a generic device in that the winding shafts are guided parallel to themselves by drives in drives of the turning disks on a diameter line.

The device according to the invention permits continuous winding of the narrow material webs formed by cutting the wide material web lengthwise, no interruption of operation being necessary for the purpose of changing the reel. When a supply roll wound from a narrow material web has reached the desired diameter, the support rollers are pivoted onto the rolls. The carriage is then moved into the center of the turning discs and the bogie is rotated by 180 °, so that the completely wound supply roll lies in the center of the bogie and a prepared winding core, for example a glued winding tube, for winding a new supply roll in the area of the central guide roller is pivoted. As soon as the finished wound supply roll around itself and the prepared winding core have been swiveled inwards by rotating the bogie, the pressure roller lies against the winding tube. The separating knife is then actuated so that the web running onto the finished supply roll is cut and at the same time the beginning of the web formed by the separating cut is pressed onto the winding core. The new supply roll is now wound onto the new winding core, while the completely wound supply roll is moved from the center into the end region of the guides and removed and a new winding core is placed on the pin or the axis of the winding device in question.

In order to avoid that undesirable tension fluctuations occur due to the pivoting of the bogie in preparation for the roll change in the web due to a change in the running length of the web, it is provided in a further embodiment of the invention that the almost completely wound supply roll according to its method in the center of the bogie can be blocked with this with the winding axis aligned with the axis of rotation of the bogie.

In order to achieve a good and firm winding of the supply rolls, it is provided in a further embodiment of the invention that the central guide roll forms a contact roll to which the supply rolls that are formed are set during winding. Air inclusions are reduced by the contact roller. In addition, the web to be wound can be fed tangentially with the desired tension.

Rollers which are pivotably mounted on levers are expediently provided in the machine frame and can be adjusted to the supply rolls between the supply rolls moved into the center of the bogie and the contact roll. The rollers are swung into the center of the bogie before each movement of the supply rolls, i.e. at the beginning of each roll change, on the supply rolls and remain there until the supply rolls are removed from the machine after the roll change. They are intended to prevent the web from running sideways during the process and to ensure that air pockets are avoided after the supply rolls have been removed from the contact roller.

The two winding devices mounted in each bogie can be moved in their guides by means of spindles or pressure medium piston cylinder units. To save space, so-called rodless pneumatic cylinders are expediently used, which are provided with longitudinal slots in which pins are connected directly to the piston are led. These pins are connected to the parts of the winding devices to be moved.

Since pneumatic cylinders do not ensure reliable synchronization, a further embodiment of the invention provides that opposite carriages which are movable in the guides and which carry the winding devices with their drives for synchronous guidance are connected to one another by the ends of chains which run in guides concentric with the axis of rotation in the edge region of the turning disks are that mesh with sprockets that are attached to fixed shafts. Both sides are coupled via the chains, sprockets and the shaft, so that the parallelism of both carriages to the contact roller is ensured and tilting is avoided. Of course, it is possible to subdivide the wide material web into more than two strip-shaped material webs and to guide them alternately to the left and right over the contact roller and to wind up the winding devices in the manner described on coaxially arranged winding cores, preferably so-called friction winding shafts.

In the case of winding devices of the type specified at the outset, there is now also the need to wind the wide material web uncut into a wide supply roll without the need for a special winding device. It is particularly desirable to be able to switch the device from the winding of two or more strip-shaped material webs formed by slitting to the winding of the wide untrimmed material web without interrupting the feeding of the wide material web. In order to be able to expand the scope of the device in this way, it is provided according to an inventive embodiment that the wide material web slitting knives can be lifted from this and that on one side of the guide roller in the machine frame on pivoting levers, a cutting knife is pivotally mounted, one of the severed to a supply roll running narrow web or the narrow webs running to one side. The non-severed or severed narrow material webs then take the subsequent unseparated wide material web to the other winding device. The continuing narrow web or the continuing narrow webs are then separated in the manner described and a wide winding tube is kept ready as a new winding tube, onto which the remaining lengths of the narrow webs are initially wound as initial pieces. These pull the uncut wide web, which is then wound on only one side of the device. A supply roll change also takes place when winding a wide web in the manner described above.

Conversely, in order to expand the area of application of the device, it is now desirable to be able to switch the winding operation from the winding of a wide film on only one side of the device back to the winding of two or more narrow material webs formed by slitting on both sides of the central guide roller. According to a further inventive development, it is therefore provided that in the machine frame coaxially with the guide roller on pivoting levers, a web lifter extending over its length is pivotally mounted, which is provided with a separating knife which cuts only one or one of the narrow webs. In order to convert the operation from the winding of a wide material web to the winding of two or more longitudinally divided narrow material webs, the knives separating the web are first pivoted into several narrow webs. Simultaneously or subsequently, the web lifter is pivoted from its inactive position in the direction of travel of the web, so that the web lifter lifts the web from the central guide or contact roller. If a prepared winding core, for example a glued winding sleeve is pressed against the divided narrow web that is to be wound on the other winding point and pressed against the contact roller via the corresponding winding device, the narrow web can be wound on this, if previously by the separating knife the web lifter has severed this web, thereby creating a front end of the web to be wound up. The continuous, longitudinally separated web runs over the web lifter to the winding device on which the finished wound supply roll with the wide material web is located. As soon as the narrow material web runs onto the winding roll, a roll change is carried out in the manner described, the new winding core being formed by an appropriately prepared narrow winding core or narrow winding tube.

The separating knife of the web lifter expediently cuts through the narrow web that only runs over a small wrap angle via the guide roller to the winding device.

In a further embodiment of the invention it is provided that the curved sliding surface of the web lifter is provided with perforations for the discharge of compressed air. In this embodiment, the web lifter is provided with a chamber which is supplied with compressed air via corresponding lines and rotary unions.

The separating knife can be displaceably guided in a longitudinal slot of the web lifter and can be moved by the piston of a rodless cylinder.

The web lifter and / or the pivotably mounted knives are expediently pivotably supported via bearing rings on the shaft of the guide roller.

Overall, the device according to the invention thus consists of a longitudinal cutting device with two winding stations which are designed as a turret winder.

In addition, there is the option of wrapping the undivided wide film on one winding point. The winding can be done without an axle or with a winding shaft.

With appropriate control, the device enables a transition from the winding of a wide film to longitudinally cut films and vice versa.

In the device according to the invention, only a short web length is lost as waste when the operating mode is switched. The supply rolls to be formed lie against the central guide or contact roller. This prevents air pockets and wrinkles.

During the entire reel change process, only slight changes in length and thus small changes in web tension take place, which ensures a high winding quality even during the reel change. This is due to the following measures:

The supply rolls are moved into the center of the turning disc before the turning discs are pivoted.

The support roller is placed on the supply roll (s) before the roll (s) move and before the turning disc is swung through.

The location at which the pressure roller lies against the supply roll (the supply rolls) is almost the point at which the incoming web runs onto the supply roll (s). This ensures that the length of the incoming web is only slightly changed when moving the roll into the center of the turning disc. As a result, no significant changes in tensile stress can occur, which can lead to the film web running.

The reel changing devices are designed so that the pressure rollers of the reel changing device which touch the web cause only a slight wrap around the incoming web and thus no significant changes in length of the incoming web or changes in tension occur.

• Fig. 1 eine Seitenansicht der Wickelvorrichtung in schematischer Darstellung,
• Fig. 2 eine Draufsicht auf die Vorrichtung gemäß der Linie 11-11 in Fig. 1,
• Fig. 3 einen Schnitt durch die Vorrichtung gemäß der Linie 111-111 in Fig. 1
• Fig. 4 den mittleren Teil der in Fig. 1 dargestellten Wickelvorrichtung während des Umstellens der Betriebsweise von dem Wickeln einer Breitfolie auf einer Wickelstelle auf das Wickeln längsgeteilter schmaler Materialbahnen auf zwei Wickelstellen,
• Fig. 5 den in seine Betriebsstellung geschwenkten Bahnabheber nach Fig. 4 in vergrößerter Darstellung
• Fig. 6 einen Schnitt durch die Vorrichtung gemäß der Linie VI-VI in Fig. 2 während des Umstellens des Wickelns von mehreren schmalen Materialbahnen auf eine breite Materialbahn,
• Fig. 7 einen Schnitt durch die Vorrichtung längs der Linie VII-VII in Fig. 2 und
• Fig. 8 eine Seitenanansicht der mit Gleichlaufführungen versehenen Wendescheibe nach Fig. 7.

An embodiment of the invention is explained below with reference to the drawing. In this shows

• 1 is a side view of the winding device in a schematic representation,
• 2 is a plan view of the device along the line 11-11 in Fig. 1,
• 3 shows a section through the device according to line 111-111 in FIG. 1
• 4 shows the middle part of the winding device shown in FIG. 1 during the changeover of the operating mode from the winding of a wide film on one winding point to the winding of narrowly divided material webs on two winding points,
• 5 shows the web lifter pivoted into its operating position according to FIG. 4 in an enlarged view
• 6 shows a section through the device according to line VI-VI in FIG. 2 during the changeover of the winding from several narrow material webs to a wide material web,
• Fig. 7 shows a section through the device along the line VII-VII in Fig. 2 and
• 8 is a side view of the reversing disk provided with synchronous guides according to FIG. 7.

The two side walls 1, 2 of a frame are connected to one another by cross members 3 and a shaft 4. The shaft 4 is rotatably supported in the side walls 1 and 2 and can be driven by a motor 5. In its central region, the shaft 4 carries a contact roller 6, which is firmly connected to the shaft 4.

Near the contact roller 6 there are two bearing rings 7 and 8, which each have a lever arm 9 and 10, are freely rotatable on the shaft 4. The ends of the lever arms 9 and 10 facing away from the bearing rings 7 and 8 carry a web lifter 11 which extends over the entire width of the contact roller 6 and is shown more clearly in FIG. 5. As can be seen from FIG. 5, the web lifter 11 consists of a profile tube 12 which is approximately semicircular in cross section for receiving a rodless cylinder 13. A knife carrier 14 is fixedly connected to the piston of this cylinder 13 and protrudes from a slot 15 of the profile tube 12 and has a knife blade 16 at its free end. Compressed air can be blown outwards through a plurality of slots 17 provided in the profile tube 12. The pivoting of the web lifter, for example from its position shown in FIG. 1 to that shown in FIG. 5, takes place via a sprocket 18 connected to a bearing ring 7, which is connected via a chain 19 to the sprocket 20 of a geared motor 21.

Coaxial with the bearing rings 7 and 8, further bearing rings 22 to 27 have been placed on the shaft 4 and, like the bearing rings 7 and 8, have freely pivotable lever arms 28 to 33. With the ends of two lever arms each, the cutter bars 34, 35 and 36 are firmly connected, of which the cutter bars 34 and 35 have pressure rollers 34 'and 35' near the actual cutter, which are mounted between the lever arms 28, 33 and 30, 32 . All cutter bars 34 to 36 can be pivoted via piston-cylinder units 37 to 42, the piston-cylinder units 37 to 42 being connected to the side walls 1 and 2 of the machine frame via holders.

2 and 3 in particular show that the frame side walls 1 and 2 have offset circular recesses. A large ball bearing is permanently inserted into each of these recesses, in each of which a turning disc 43 is rotatably mounted. All four turning disks 43 are each equipped with two linear guides 44 running parallel to one another. The Both linear guides 44 of each turning disc 43 are surrounded by play with U-shaped profile pieces 45, the two U-shaped profile pieces 45 belonging to a turning disc 43 being firmly connected to a bearing plate 46. A motor 47, which carries a sprocket 48, is screwed to each end shield. This sprocket 48 is connected via a chain 49 to the drive sprocket 50 of the winding shaft 51. The corresponding winding shaft bearings 52a, 52b are fixedly mounted in the bearing plates 46. Two mutually opposite bearing plates 46 can then be displaced on the linear guides 44 via piston rodless units 52 ', 52 ".

It is clear from FIG. 2 that the two upper piston cylinder units 52 'shown in FIG. 3 are provided for the displacement of the winding shaft bearings 52a and the two lower piston cylinder units 52 "are provided for the displacement of the two winding shaft bearings 52b. In the right half of FIG. 2, the piston-cylinder units 52 ', 52 "are only shown in a hint. However, the conditions here are the same as on the left-hand side of FIG. 2. All piston-cylinder units 52 ′, 52 ″ are firmly connected to the turning disks 43 by means of holders 53. Since the piston-cylinder units 52 ′, 52 ″ are pneumatically operated, care must be taken to ensure that there is synchronism when moving a winding shaft 51 so that the winding shaft 51 does not tilt. For this purpose, both the upper and the lower half of each turning disc 43 are encompassed by a parallel guide chain 54 or 55, the upper parallel guide chain 54 being guided via guide rollers 56 with the end shield 46 'and the lower parallel guide chain 55 being guided via guide rollers 57 with the End shield 46 "is firmly connected.

3 and 7 show, a continuous shaft 58 is rotatably mounted below the turning discs 43, which has two sprockets 59. These two sprockets are connected to the two lower parallel guide chains 55. In order to bridge the distance in the central area of the turning disks 43 between the upper chains 54 and the lower chains 55, two chain pieces are placed on each turning disk 43 in this area, the ends 61 and 62 of which are firmly connected to the turning disks 43. From Fig. 8 it is clear that the transition chain pieces 59 and 60 are adjacent to the parallel guide chains 54 and 55. In order to be able to bring both the transition chain pieces 59 and 60 and the parallel guide chains 54 and 55 into engagement with the chain wheel 59, this is designed as a wide double chain wheel.

The turning disks 43 themselves are each equipped with an outer ring gear 63. A gear 64 meshes with the teeth of these sprockets, of which only one gear 64 is shown in FIG. 3. The two gear wheels 64, each belonging to two turning disks 43, are connected to one another by the turning disk drive shaft 65 and can be driven by the motor 66, which is fixedly connected to a frame side wall and the drive shaft of which is flanged to the turning disk drive shaft 65.

Corresponding to the width of the web to be wound, winding sleeves 67 sit on the winding shaft. The material web rolls 68 to be wound on these winding sleeves 67 are assigned pressure rollers 69 which are articulated via levers 70 on a rod 71 which is mounted in the frame side walls. The pressure rollers 69 are moved via pneumatic piston-cylinder units 72.

FIG. 3 shows that each turning plate 43 has two locking bolts 73, 74 which can engage in corresponding openings in the end shields 46 in order to be able to lock the movement of the end shields 46 with respect to the turning plates 43. This happens whenever the two end shields 46 of two turning disks 43 are in the middle position, which is shown in the left half of FIG. 1.

The operation of the device is described in more detail below:

1, a wide continuous material web 75 is fed via a guide roller 76 to a longitudinal cutting device 77, by means of which the wide material web is cut into two or more narrower webs. These narrower webs reach the contact roller 6 via a further deflection roller 78. One of the two narrow webs of material is wound on the left and the other on the right side of the device shown in FIG. 1. The left side shows an almost full web of material web 68, which is displaced into the middle together with the associated winding shaft 51 by means of the upper piston-cylinder units 52 'shown in FIGS. 2 and 3 and locked there. The bearing plate 46 is shown for the material web roll 68 pushed into the middle. In addition to these two end plates 46 carrying the web of material web 68, the two turning disks 43 carry two further end plates, which are not shown for the sake of simplicity. A winding sleeve 67 'is placed and braced on the winding shaft carried by these end shields. This winding sleeve 67 'is covered with strips of glue. The narrow web of material 75 'consequently runs over the contact roller 6, 6, the winding tube 67' to the web of material web 68, to which the web is pressed via the support roller 69. At this moment, the piston-cylinder units 37 and 40 are actuated, as a result of which the cutter bar 34 and the pressure roller 34 'assigned to it are pivoted into the narrow material web 75'. First, the pressure roller 34 'lies against the winding tube 67' and presses the new beginning of the web onto this glued winding tube 67 '. The cross cutting knife is then operated to separate the web with the aid of a rodless cylinder and the material web 75 'is cut. The pressure roller 34 'assigned to the cutter bar 34 presses the new web start on the glued winding tube 67 ', so that a new web roll is formed at this point, while the then full web roll 68 is removed after the process in the left outer end position.

The right-hand side of FIG. 1 shows a material web roll 68 'which has not yet been completely wound and on which the second narrow web part 75 "runs. As soon as the roll 68' is also finished, the support roller 69 is pivoted onto the film roll. The end shields 46 are then 'Move to the right into the middle of the two turning disks 43 and lock there. After the end shields 46' have been locked, the turning disks 43 are pivoted counterclockwise by the drive motor 66 until the newly inserted winding sleeve 67 "is in the winding position in which then the two linear guides 44 again run horizontally. After this has been done, the cutter bar 35 is pivoted counterclockwise by the piston-cylinder units 38 and 42, so that the material web 75 "can be cut through and a new winding can be formed. In the position shown in FIG. 1, consequently, both on the left as well as on the right side of the device winding rollers formed.

In the event that the web 75 is not to be severed and instead of two or more narrow webs only a single large web is to be wound up, this wide web is only wound up with the winding device shown on the left-hand side of FIG. 1. For this purpose, the support rollers are first pivoted onto the rollers. The end shields 46 'shown on the right in FIG. 1 are then moved to the center of the turning disks 43 and locked there. The turning disks 43 are then rotated through the drive motor 66 through 180 ° until the end shields 46 "assume the position shown in FIG. 6 on the right side of the drawing. However, the winding shaft normally carried by the end shields 46" has been removed beforehand in order to to create a free passage for the separating knife 36, which cuts through the narrow strip still running onto the material roll 68 '. The narrow web tab 75 ″ which is still present from the interface of the knife 36 to the full web width 75 is guided around the contact roller 6 by the narrow web part 75 ′.

As soon as the uncut web 75 has passed the winding tube 67 ', the width of which corresponds to the width of the uncut web 75, the web 75 is severed by the knife 34, so that the wide web not divided in the longitudinal direction on the previously glued winding tube 67' 75 is wound up. While the right side of the device shown in FIG. 6 remains completely without function during further operation, web rolls are formed on the left side of the device without interruption, which correspond to the width of the material web 75 fed. The role change taking place on the left was previously described with reference to FIG. 1 and is known per se.

From this mode of operation shown in FIG. 6, in which a wide web is wound up on the left side of the device, the device according to the invention can be switched back to an mode of operation in both the left and the right side of the device without interruption for example, a narrow web is wound up. For this purpose, the web lifter 11 is first pivoted from its basic position shown with dash-dotted lines into the position shown with solid lines via the drive motor 21. This situation is shown in Fig. 5. During the pivoting movement of the web lifter 11, the end shield 46 "is in a position remote from the contact roller 6. Only when the web lifter 11 has assumed the position shown in FIGS. 4 and 5 is the longitudinal cutting device 77 broken into the operating position, as a result of which the web 75 is divided into two narrow webs 75 ', 75 ". The bearing plate 46 "is then moved into the position shown in FIG. 4 on the linear guides 44. A winding sleeve 67", which corresponds to the width of the narrow web to be wound up, is placed on the winding shaft 51 previously inserted in the bearing plate 46. The winding sleeve 67 "presses the web 75" against the contact roller 6, while the web 75 'is not gripped by the winding tube 67 ", since the winding tube 67" and web 75 "are congruent with one another with the same width.

The knife 16 of the web lifter is then actuated and only cuts through the web 75 ", but not the web 75 '.

Due to the fact that the winding sleeve 67 "has been glued before it is inserted, the web 75" is then wound onto the winding sleeve 67 "while the web 75 'runs onto the material web roll 68, which was previously wound with a wide web 75. After this has happened, a roll change takes place on the left side of the device, ie the material web roll 68 is moved to the center of the turning disks 43 and locked there.

Then the two turning disks belonging to the material web roll 68 are rotated through the motor 66 by 180 °, whereby a new winding sleeve 67 'is pivoted into the winding position. This position is shown on the left-hand side of FIG. 2, with the only difference that in FIG. 2 the material web roll 68 is a narrowly wound roll.

Claims (13)

1. An apparatus for winding up into stock rolls (68, 68') several narrow webs (75', 75") of material formed by the longitudinal cutting of a wide web (75) of material

with guide rollers (76, 78) for the webs with cutters (77) for the longitudinal cutting of the rear web (75) of material

with winding up devices with winding cores (67, 67') for the narrow material webs (75', 75"),

provision being made, on both sides of a central guide roller (6) causing the narrow material webs (75', 75") to diverge in their direction of movement, for two winding up devices (68, 68') each, in one rotary frame each, rotatably mounted in the machine frame by means of turn over discs (43) provided with rotary drives (66) with the axis of rotation being parallel to the guide roller (6) and

there being allocated to the respective winding up device (68, 68') arranged on the inside with reference to the guide roller (6), one severing cutter (34; 35) each, pivotably mounted in the machine frame and having an auxiliary roller (34'; 35'),
characterized in that

the winding up shafts (51) are carried by means of guide ways (44) of the turn over discs (43) for displacement on a diameter line parallel to themselves.

2. An apparatus according to claim 1, characterized in that each of the respective two winding up devices (68, 68') is displaceable from an end zone of the guide ways (44) into the centre zone of the rotary frame and can there be locked by means of locking elements (73, 74) in such a way that the winding up shaft (51) of the displaced winding up device is aligned with the axis of rotation of the rotary frame.

3. An apparatus according to claim 1 and/or 2, characterized in that the central guide roller (6) forms a contact roller whereto the stock rolls (68, 68') being formed are applied during the winding up process.

4. An apparatus according to claim 1-3, characterized in that during the winding up process a small gap remaining approximately the same is formed between the guide roller (6) and the stock rolls (68, 68').

5. An apparatus according to one of claims 1-4, characterized in that in the machine frame, provision is made for rollers pivotably mounted by means of levers, which rollers can be applied or pivoted on to the stock rolls (68, 68') before any displacement of the stock rolls (68, 68'), that is to say, at the beginning of every roll change, in order to prevent any lateral straying of the web during the displacement and to avoid any air bubbles after removal from the contact roller.

6. An apparatus according to one of claims 1-5, characterized in that the winding up devices are displaceable by means of hydraulic piston cylinder units (52', 52") in their guide ways (44).

7. An apparatus according to one of claims 1-6, characterized in that opposite sliders displaceable in the guide ways (44) and carrying the winding up device with its drives are interconnected for synchronized running with the ends of chains (54, 55) running over guide ways concentric to the axis of rotation in the peripheral zone of the turn over discs (43), which chains mesh with sprocket wheels (59) mounted on shafts (58) fixed to the frame.

8. An apparatus according to one of claims 1-7, characterized in that the cutters (77) longitudinally cutting the wide material web can be lifted off from the latter and in that a cutter (34) is pivotably mounted in the machine frame on pivoting levers on one side of the guide roller (6), which cutter severs one of the narrow webs passing to one stock roll (68).

9. An apparatus according to one of claims 1-8, characterized in that a web lifter (11) is pivotably mounted on pivoting levers in the machine frame coaxially with the guide or contact roller (6) and extending over its length, which lifter is provided with a severing cutter (16) severing only one of the two narrow webs.

10. An apparatus according to claim 9, characterized in that the severing cutter (16) of the web lifter (11) severs the narrow web or several narrow webs running only over the smaller angle of contact over the guide roller (6) towards the winding up device.

11. An apparatus according to claim 9 and/or 10, characterized in that the curved working surface of the web lifter (11) is provided with perforations (17) for the emergence of pressurized air.

12. An apparatus according to one of claims 9-11, characterized in that the severing cutter (16) is carried for transverse displacement in a longitudinal slot (15) of the sliding shoe (11) and in that it is displaceable by the piston of a cylinder (13) without a piston rod.

13. An apparatus according to one of claims 1-13, characterized in that the web lifter and/or the pivotably mounted cutters (34, 35, 36) are pivotably mounted by means of mounting rings (7, 8, 22 ... 27) on the shaft of the guide roller (6).

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