Method and device for positioning edge cutting devices of a longitudinal cutting device for a material web in a roll cutting machine

Abstract

The invention relates to a method and a device for longitudinal cutting and winding up a running material web (3) in a roll cutting machine (1) into finished rolls, in particular a paper or cardboard web, by means of at least three cutting devices (2.1, 2.2, 2.3, 2.4, 2.5) that produce in the running material web (3) at least one longitudinal cut in a first cutting position (S1, S2, S3, S4, S5) before a format change (13) in a first format, and wherein during the format change (13) an adjustment (23) of at least one cutting device takes place transversely to a running direction (L) of the material web (3), and wherein after the format change (13), at least one longitudinal cut is made at a second cutting position (S6, S7, S8, S9) and a second, new format is produced, and wherein at least one edge cutting device (2.1, 2.5) cuts off at least one edge strip (16.1, 16.2, 16.3, 16.4). It is essential to the invention that all cutting devices (2.1, 2.2, 2.3, 2.4, 2.5) cut the material web (3) in an imaginary common plane, and that the adjustment (23) of the at least one edge cutting device (2.1, 2.5) takes place while the material web (3) is running.

Description

[0001] Method and device for positioning edge cutting devices of a longitudinal cutting device for a material web in a roll cutting machine

[0002] The invention relates to a method for longitudinal cutting and winding a running material web, in particular a paper or cardboard web, in a roll cutting machine into several finished rolls formed from individual material web layers, by means of a longitudinal cutting device which comprises at least three cutting devices, each comprising a pair of knives with a lower knife device and an upper knife device, and wherein the at least three cutting devices each produce a longitudinal cut in the running material web in a first cutting position in a first format before a format change, and wherein a continuous adjustment of at least one cutting device takes place transversely to a running direction of the material web, and wherein after the format change at least one longitudinal cut is produced at a second, new cutting position in a second, new format, and wherein at least one, preferably two,the at least three cutting devices are designed as at least one edge cutting device and cuts off at least one edge strip, and wherein the edge strip is guided into at least one discharge device.,

[0003] The invention also relates to a longitudinal cutting device for cutting a running material web, in particular a paper or cardboard web, in a roll cutting machine, particularly suitable for carrying out the method according to the invention, comprising at least three cutting devices, each comprising a pair of knives, and wherein each pair of knives comprises a lower knife device supporting the material web and an upper knife device dipping into the material web, and all lower knife devices are mounted on a common knife crossbar and all upper knife devices on another common knife crossbar so as to be adjustable transversely to the running direction, and wherein each upper knife device is connectable to an adjusting device and each lower knife device is connectable to an adjusting device, and wherein two cutting devices are designed as edge cutting devices in such a way as to produce a respective edge strip.

[0004] The invention is explained below in connection with the treatment of a paper web. However, it is also applicable to other material webs that require similar handling. These include, for example, but are not limited to, webs of cardboard, paperboard, plastic, or metal foil.

[0005] Paper webs are produced in relatively large widths of up to over 11 meters in a paper machine. The paper web is produced virtually endlessly. The direction of travel of the material web in the paper machine defines the longitudinal or x-direction in a clockwise coordinate system, and the transverse or y-direction in the horizontal plane of the material web.

[0006] At the end of the paper machine, the produced paper web is wound onto a winding core in its full width. This winding core is replaced cyclically, usually during ongoing production. The resulting web-wide winding roll is commonly referred to as a mother roll or full reel.

[0007] To be manageable for a subsequent user, such as a printing company, the paper web wound on a master roll must be cut into several parallel sub-webs, each with a width suitable for the respective subsequent user. These widths can vary considerably from case to case, so the paper web is usually divided according to an individually definable cutting pattern or format. This is usually done in a downstream roll cutting machine.

[0008] Such roll cutting machines with at least one longitudinal cutting device are known, for example, from the German utility model DE29812753 U1.

[0009] The well-known slitting machines, which feature multiple longitudinal cutting devices, produce individual, narrower wound rolls, or so-called finished rolls, from a wide material web of a parent roll. By additionally cutting across, several sets of finished rolls are usually produced from one parent roll. To produce different finished roll formats, cutting devices in the form of individual pairs of knives can be positioned transversely to the direction of travel of the material web.

[0010] In a known manner, the knife pairs, usually in the form of circular knives, each consist of a lower knife, a cup knife, or counter knife that supports the web during cutting, and an upper knife or pointed knife that plunges into the web. Their cutting edges must be precisely aligned with each other in the desired cutting position. Typically, the lower knife is driven, while the pointed knife, as the upper knife, is mounted for free rotation. This is described, for example, in German patent DE3419843C2.

[0011] As is known in the art, a slitting machine is used to cut a material web lengthwise into sub-webs, usually of a smaller width. These sub-webs are wound in the slitting machine into so-called finished rolls, shipping rolls, winding rolls, or sub-rolls, and together form a finished roll set, a finished roll set, or a so-called "set."

[0012] The typical process in a slitter-reel machine with at least one slitting device and a subsequent rewinder is explained using the following example. For simplicity, we assume that a total of three finished rolls are produced and that the material web is already guided semi-automatically or fully automatically through the entire system to the rewinder and its cores in a conventional manner. There, once the material web has been divided into sub-webs following activation of the slitting device, it is attached to a winding core set or core set located in the winding bed. The actual production process can now begin, in which the sub-webs are wound under tension around the winding cores to form finished rolls comprising several layers of material web.

[0013] Once the first set of finished rolls has been wound, a first "set change" takes place. This means that the partial webs are separated transversely to the running direction, the finished roll set is ejected, and the newly formed web ends of the partial webs are attached to a new core set. This "set change" usually takes place when the material web is at a standstill.

[0014] After the downtime due to the set change, production of a second set or a second set of finished rolls is started and completed. The processes described above are of course repeated over and over again. The formats of the finished rolls correspond to the widths desired and requested by the end customer and can vary greatly. For this reason, the finished roll formats in a slitting machine can change several times during production. In the rarest of extreme cases, from set to set, which means that only one set of finished rolls with the same format is wound. If the width of the desired finished rolls changes and a so-called "format change" or cutting pattern change is carried out, the cutting devices of the slitting device in the slitting machine are adjusted to the desired distance from one another in the width direction or across the running direction of the material web.This means that the finished rolls are produced in a new, desired width or format.

[0015] Once the second set of finished rolls has been completed, a so-called format change, cutting pattern change, or width change of the partial web is performed during the second set change – usually while the system is at a standstill. This format change is usually initiated shortly before the end of the second winding process because, depending on the geometry of the slitter-rewinder, a certain length of the material web still needs to be fed to the cutting device, which cuts the web across the running direction. This typically results in another line downtime, in addition to the second set change-related downtime, since the cutting devices are adjusted during the standstill.The typical process sequence during the rewinding process is: deceleration from full production speed; stop for the format change; continuation at creep speed; stop for the set change, during which the material web is also separated crosswise to the running direction; creep speed for winding the first layers onto the new winding cores; acceleration to full production speed. If a format change occurs during the second set change, a new core set corresponding to the new widths is inserted, and a third set of finished rolls with the new format settings is produced. The above processes are then repeated.

[0016] By adjusting the cutting devices, the cut setting in the material web is changed. In conjunction with the change in the cut setting of the slitter in a slitter-winder, the width of the edge trim can naturally also change. The edge trim or edge strip remaining at the edge of the material web is guided through a discharge device into a pulper, shredding fan, or extraction system. When changing the edge strip width during a "format change," after a new and an old cut setting, an "untrimmed neck" usually remains between the edge strips. This neck is torn off manually by the operating personnel in order to safely transfer the edge strip to the pulper.

[0017] A method for changing the blade setting of a slitter-rewinder during slitting to produce material webs of different widths and simultaneously perform edge trimming is known from EP 1313597 A1. By using a second automated edge trimming device for edge trimming, in addition to the slitting device used, manual operator interaction to remove an otherwise protruding edge strip during format changes can be avoided, thus increasing production capacity.

[0018] Nowadays, one goal is to design the slitter-rewinder and its associated operations so that their operation requires only one person, controlling the slitter-rewinder operation from a control room. Removing the neck between the edge strips slit after a new and an old blade adjustment by tearing out a piece from that tip, as described above, was a manual process, so the slitter-rewinder's other related tasks had to be interrupted, and the slitter-rewinder could not start until the "untrimmed neck" was removed. This reduces the slitter's production capacity. In addition, an additional worker was often required to perform this operation, which must be done by hand.This manual process also poses a risk to occupational safety, as it is performed in a dangerous location near cutting devices. In order to perform at least one format change (also known as a pattern change) in the material web, the slitter-rewinder must be shut down. With the material web also at a standstill, at least one pair of knives is then retracted from the material web, positioned at the new cutting position using at least one adjusting device, and then retracted into the material web. The slitter-rewinder can now be put back into operation.

[0019] This currently practiced procedure for changing the pattern or format unfortunately has the major disadvantage that, on the one hand, the rotary cutting machine has to be switched off and, on the other hand, a great deal of time is required for the change.

[0020] A "format change" refers to a process step in which the cutting devices are adjusted transversely to the direction of travel from an old cutting position to a new cutting position. This process step, or the format change, is assigned at least one time range and one material web range in the direction of travel of the material web. The at least one time range can include different process steps for adjusting the cutting devices. The time range of the format change typically begins at the point in time at which at least one cutting device changes operating mode or the adjustment transversely to the direction of travel of the material web begins.For example, the format changeover time range can extend from the change in the operating state of at least one cutting device, preferably to a standby state, the adjustment of the cutting device transversely to the running direction, to the renewed change in the operating state of the at least one cutting device, preferably to a cutting state. Alternatively, it is possible for the format changeover time range to begin at the time of the start of an adjustment transversely to the running direction from an old, previous cutting position and end with the reaching of a new cutting position.

[0021] Furthermore, a material web area or an area in the direction of travel of the material web is assigned to the format change, where the cutting position adjustment is usually located. This material web area can, at a minimum, occupy only a line or position perpendicular to the travel direction on the material web when the material web is stationary, or, in the case of a material web moving at a certain speed, it can be assigned an area with an extension or length in the travel direction.

[0022] The object of the invention is to provide an improved method for automatic format change and an improved longitudinal cutting device, in particular for a roll cutting machine, which reduces the required number of longitudinal cutting devices and the method for format change in complexity and costs.

[0023] A further object of the invention is to implement the above-mentioned objective not only for new slitter-rewinders, but also particularly advantageously for the modernization of existing older slitter-rewinders with an existing longitudinal cutting device as defined in the generic term. The utilization of the slitter-rewinder can be advantageously increased through the modernization while simultaneously reducing investment costs. Furthermore, time-consuming and risky manual interaction during format changes, which is typically still necessary with these older systems, is no longer necessary.

[0024] The present invention is characterized by the features of the independent claims. Advantageous embodiments can be found in the subclaims, the description, and the drawings.

[0025] According to the invention, the object is achieved in that the at least three cutting devices cut the material web in an imaginary, common plane, and in that the adjustment of the at least one edge cutting device takes place while the material web is moving. Advantageously, the adjustment of one of the two edge cutting devices takes place while the material web is in motion and the edge cutting device is engaged or in the cutting state with the material web and thus produces a longitudinal cut at a cutting position in the running direction of the material web before and after the format change. In the material web area of ​​the format change in the cutting state, the adjustment while the material web is moving results in a cut at a specific angle in the running direction of the material web, the orientation of which deviates from the longitudinal cutting direction in the plane of the running direction and transverse to the running direction.

[0026] This advantageously eliminates the need for manual interaction by the operating personnel when changing formats.

[0027] Advantageously, the time required for format changes can be reduced, as the adjustment takes place while the material web is running. The time saved can have a direct impact on production capacity and result in increased production capacity.

[0028] In a further alternative embodiment, the at least one edge cutting device remains continuously in the cutting state and in engagement with the material web during the adjustment from the first cutting position to the second cutting position.

[0029] In a further alternative embodiment, the adjustment of the edge cutting devices takes place at a speed of the material web greater than 10 m / min, in particular greater than 40 m / min, particularly preferably greater than 80 m / min.

[0030] Advantageously, a reliable and safe adjustment of the edge cutting devices can be carried out in the cut state at a material web speed of greater than 10 m / min. Preferably, a constant creep speed of greater than 10 m / min is selected. Furthermore, the time required to adjust the edge cutting devices for the changeover process can be further optimized by allowing the adjustment of the edge cutting devices to take place when the material web is decelerating from production speed, i.e. in a transient process state, and thus shifting it to a region of the winding process which is usually determined by parameters not related to the format change, such as the inertial masses of the parent or finished rolls, thus further reducing or eliminating the time required at creep speed for adjustment.

[0031] In a further alternative embodiment, a speed of adjustment of the edge cutting devices transverse to the running direction of the material web of less than or equal to 100%, in particular less than or equal to 56%, in particular preferably substantially 56%, of the speed of the material web is controlled. Advantageously, with a corresponding adjustment speed according to the above parameters, an optimal cutting angle for the cutting device is established for a high-quality cut. This cutting angle must not be too blunt, nor must the adjustment speed be too high, as this would adversely affect the reliable removal of the edge strip. Furthermore, the cutting device with the corresponding lower and upper blade devices remains oriented in the material web plane with its preferred alignment in the longitudinal direction.An adjustment with the above parameters transverse to the running direction does not lead to a build-up of the material web at the cutting device and / or an interruption of the longitudinal cut, despite a deviation from the optimal cutting direction in the longitudinal direction.

[0032] In an alternative embodiment, a further degree of freedom for the cutting device for adjusting the lower knife device and the upper knife device in the cutting direction, deviating from the running direction, is conceivable, but for reasons of complexity this is only justifiable for particularly high-quality cuts.

[0033] In a further alternative embodiment, when adjusting the at least one edge cutting device, the control is carried out in such a way that a length of a material web area for the format change of up to a maximum of 1 m, in particular up to 0.5 m, is set.

[0034] This means that a minimum permissible speed for adjusting the edge cutting devices can be determined depending on the material web speed and the desired change in the distance between the positions transverse to the direction of travel. The time required for adjustment during the format changeover ideally leads to a limitation of the changeover area in the direction of travel and thus to a reduction in the amount of cutting required by the non-longitudinal cut.The first few meters of the material web on a new set of finished rolls, or the first inner layers of the finished rolls, as well as the last few meters of the almost completely wound finished rolls or the last outer layers, are typically marked as scrap for further production, as they may contain possible splices or other contamination. The first and last few meters of a finished roll are usually treated as scrap for technical reasons to ensure clean threading. The material web area of ​​the format change in the machine direction is therefore within the usual scrap range and therefore does not negatively impact production.

[0035] In a further alternative embodiment, the adjustment of the at least one edge cutting device from a larger initial width of the edge strip before a format change to a smaller width of the new edge strip after a format change takes place after the format change has been reached.

[0036] Furthermore, in a further alternative embodiment, a material web section having a variable width resulting from the format change is wound up with the first or inner material web layers of a new finished roll of a corresponding partial web.

[0037] Furthermore, in a further alternative embodiment, a speed of adjustment of the edge cutting device is set to less than or equal to 100%.

[0038] Advantageously, the adjustment speed when extending the cutting device to a smaller width of the edge strip can be selected higher due to a lower risk of paper jamming.

[0039] In a further alternative embodiment, the adjustment of the at least one edge cutting device from a smaller initial width of the edge strip before the format change to a larger width of the new edge strip after the format change takes place before the format change is reached.

[0040] In a further alternative embodiment, by adjusting the edge cutting devices from a smaller initial width of the edge strip before the format change to a larger width of the new edge strip after the format change, a material web section having a variable width resulting from the format change is wound up with the last or outer material web layers of an almost finished roll of the corresponding partial web before the format change is reached.

[0041] In a further alternative embodiment, a speed of adjustment of the edge cutting device is set to less than or equal to 56%.

[0042] Advantageously, the adjustment speed of the edge cutting device can be selected to be lower for a larger width of the edge strip, i.e. when adjusted towards the center of the material web, due to a higher risk of paper jamming, whereby 56% of the material web speed has proven to be optimal.

[0043] In a further alternative embodiment, the adjustment of the edge cutting devices during a format change is automatically controlled by a control unit of the roll cutting machine.

[0044] With regard to the device, it is essential that the two edge cutting devices each comprise at least one coupling element between the upper knife device and the lower knife device, and that the two edge cutting devices each comprise at least one guide element for the cut-off edge strip.

[0045] Advantageously, the otherwise usual separate edge cutting device for edge strip trimming is integrated into a single longitudinal cutting device, thus significantly reducing complexity and costs.

[0046] Advantageously, the integration into an imaginary knife plane, which extends transversely to the running direction and the rotation centers of the upper and lower knives, can result in several advantages. For example, the number of guide rollers required to guide the material web can be reduced to a minimum, usually a maximum of two guide rollers. Furthermore, the number of required discharge devices for the edge trim and / or for a new thread or web break in the slitter-winder can be used, which thereby reflects further savings and a reduction in complexity and thus also less maintenance expenditure.

[0047] In a further alternative embodiment, at least one of the two edge cutting devices is adjustable during the longitudinal cut being carried out or during the intervention in the material web or in the cutting state, along the knife cross member extending transversely to the running direction of the material web.

[0048] In a further alternative embodiment, the at least one mechanical guide element can be firmly or rigidly connected to the lower knife device, the upper knife device and / or the coupling element in such a way that synchronization of the upper knife device and the lower knife device is enabled and adjustment transverse to the running direction is enabled.

[0049] In a further alternative embodiment, the at least one coupling element is designed as a mechanical coupling rod.

[0050] In a further alternative embodiment, the at least one mechanical guide element is designed as a guide plate and / or an air blowing device and / or a discharge device subjected to a vacuum.

[0051] In a further alternative embodiment, the longitudinal cutting device comprises a measuring system, preferably at least one magnetic sensor rod, in particular for the absolute position determination of each cutting device transverse to the running direction.

[0052] Furthermore, in a further alternative embodiment, each cutting device on the lower knife device and / or the upper knife device can comprise a separate sensor, in particular for determining the position transverse to the running direction. In a further alternative embodiment, the edge cutting devices have an adjustment range of up to 750 mm, in particular up to 500 mm, from the respective edge of the material web to the center of the material web.

[0053] In a further alternative embodiment, each lower knife device and each upper knife device of each cutting device each comprises its own separate adjusting device, which is suitable for carrying out an adjustment transversely to the running direction, preferably each comprising its own separate electric linear drive and / or electric drive with a gear guide.

[0054] In a further alternative embodiment, the adjusting device of all upper knife devices is designed as a single rotating belt drive, which enables the adjustment on the common knife crossbar of the upper knife devices and the adjusting device of all lower knife devices is also designed as a single rotating belt drive, which enables the adjustment on the common knife crossbar of the lower knife devices.

[0055] Advantageously, all lower knife devices comprise a common, single adjusting device transverse to the running direction and all upper knife devices comprise a common, single adjusting device transverse to the running direction, in particular preferably each comprise a common belt drive running across the width of the web, preferably each comprising a toothed belt running across the width of the web.

[0056] In a possible embodiment of the adjusting device with a belt drive running across the width of the web, preferably a toothed belt running across the width of the web, the carriages of the upper knife device and the carriages of the lower knife device are designed in such a way that a controllable, positive connection of the carriages with the belt drive running across the width of the web can be made possible for adjustment.

[0057] In an alternative embodiment, the belt drive running across the width of the web is designed as an endless belt, in particular an endless toothed belt, running across the width of the web in a direction transverse to the running direction. The belt preferably runs only in one direction transverse to the running direction of the material web and is guided by at least two deflection rollers arranged at the edge of the slitting device, with at least one deflection roller being driven and comprising a controlled drive, preferably an electric motor. The arrangement or orientation of the belt running across the width of the web is selected such that both the left- and right-moving sections of the circulating belt are guided simultaneously by all carriages of the corresponding upper knife device or by all carriages of the lower knife device.Each carriage includes a controllable locking system that allows it to connect to either the left-moving section or the right-moving section of the web-wide, continuous belt of the corresponding adjusting device. The connection between the carriage and the adjusting device is preferably established by a positive locking mechanism. This enables the carriage of the upper knife device or the carriage of the lower knife device, depending on the adjustment direction, to be connected in a positive, controllable manner to the section of the web-wide, endlessly circulating belt of the respective belt drive, running in the respective direction.

[0058] Advantageously, it is possible to enable simultaneous adjustment of all cutting devices, in particular all upper knife devices and all lower knife devices, regardless of the desired adjustment direction, in particular to the left and / or to the right.

[0059] Furthermore, it is advantageously possible to carry out a simultaneous adjustment of one upper knife device or lower knife device to the left and another upper knife device or lower knife device to the right with a single common belt drive, while maintaining the direction of movement of one belt drive of the upper knife devices and the one belt drive of the lower knife devices. For example, a first of two upper knife devices is connected to the section of the belt running across the width of the web moving to the right, and the second upper knife device is connected to the section of the same belt running across the width of the web moving to the left. This enables a simultaneous adjustment of the first upper knife device to the right and the second upper knife device to the left.

[0060] In an alternative embodiment, the at least one edge-cutting device is designed with a coupling element such that only the included upper blade device or only the included lower blade device can be connected to a corresponding adjusting device. In a further alternative embodiment, the at least one edge-cutting device is designed with a coupling element such that the edge-cutting device comprises its own, separate adjusting device, which is arranged separately from the remaining cutting devices.

[0061] In a further alternative embodiment, the edge cutting devices each comprise at least one separate adjusting device, in particular preferably at least one spindle drive, designed such that the separate adjusting device adjusts only one edge cutting device.

[0062] In a further embodiment, it is conceivable that the edge cutting device comprises two separate adjusting devices, such that the upper knife device and the lower knife device are each adjusted by a separate adjusting device.

[0063] In a further alternative embodiment, the control devices are connected to a control unit.

[0064] In a further alternative embodiment, the at least one guide element comprises at least one perforated region with through-openings, which is designed such that a stable air boundary layer is formed between the edge strips and the perforated region of the guide element.

[0065] In a further alternative embodiment, the at least one guide element comprises at least a first perforated region and a second perforated region with through-openings, wherein the second region has at least a 50% higher flow rate of air per unit area, particularly preferably more than 25%, than the second perforated region.

[0066] Advantageously, the flow rate in the area of ​​the longitudinal section is increased and the distributions are more highly resolved in order to transport even narrower edge strips stably and without fluttering.

[0067] In a further alternative embodiment, the through-openings are designed to be supplied with air by a fan. In a further alternative embodiment, the edge-cutting devices each comprise a first guide element and a second guide element, wherein the second guide element is designed as a guide baffle and is configured such that the edge strip runs between the two guide elements.

[0068] Advantageously, the edge-cutting device includes a second guide element, which can provide additional support for the edge strip from an opposite side of the material web. The second guide element, designed as a guide plate, can be less stable and solid than the first guide element to facilitate a rotational mounting of the guide plate, which allows the guide plate and the edge strip a certain degree of flexibility to reduce possible edge strip tears caused by an overly rigid design.

[0069] In a further alternative embodiment, the lower knife device comprises a carriage and the upper knife device comprises a carriage, and wherein the carriages are each adjustably mounted on a knife cross member extending transversely to the running direction of the material web, and wherein these each comprise a knife holder for mounting the associated knife.

[0070] “Automatic” means that during normal operation of the slitter-rewinder there is no manual interaction by the operator to change the width of the finished rolls.

[0071] "Adjustment" refers to the adjustment of at least one cutting device included in a longitudinal cutting device, transverse to the direction of travel of the material web. The adjustment is continuous, without, for example, a grid. The adjustment range extends at least across the entire width of the longitudinal cutting device and thus usually across the width of the material web.

[0072] The "adjustment angle" is the angle between the running direction of the material web and the resulting cutting line in the material web plane. This results from an adjustment of the cutting device from a first to a second cutting position transverse to the running direction over a certain period of time, while the material web continues to move. The distance adjusted in the running direction of the format change corresponds to the adjacent side, and the distance adjusted transverse to the running direction corresponds to the opposite side of the adjustment angle, which can thus be calculated using a trigonometric "tangent." The adjustment angle can also be defined by the speed of the material web and the travel speed of the edge cutting device transverse to the material web.

[0073] A "control system" is understood here as the entirety of the functional components required to execute control and regulation tasks, as well as their interconnections. This includes control units, regulators, devices for recording actual values, disturbance variables, and actuating devices, as well as their interconnections.

[0074] The invention is explained below with reference to figures. The invention expressly extends to embodiments that are not defined by feature combinations from explicit references to the claims, whereby the disclosed features of the invention may be combined with one another—to the extent that this is technically reasonable.

[0075] Corresponding elements of the exemplary embodiments in the figures are provided with the same reference numerals. The functions of such elements in the individual figures correspond to one another unless otherwise stated and unless contradictions arise. A repeated description is therefore omitted. It is also pointed out that the differing features of the exemplary embodiments shown can be interchanged and combined with one another. The invention is therefore not limited to the combinations of features shown in the exemplary embodiments shown.

[0076] The figures show in detail:

[0077] Fig. 1: A simplified and schematic side view of the design of a slitting device for a roll cutting machine. Fig. 2: A simplified and schematic top view of a material web moving in the direction of travel, showing an example of a format change of the cutting devices in a slitting device, the associated partial webs, edge strips, and the resulting cuts in the material web.

[0078] Fig.3 An enlarged view of the edge areas of Figure 2 with the parameters for adjusting the edge cutting devices.

[0079] Fig. 4 A representation of a perforated guide element for stabilizing the edge strips.

[0080] Fig. 4a An enlargement of the perforated area of ​​the guide element.

[0081] Figure 1 shows a longitudinal cutting device 2 for a slitter-winder 1 comprising five cutting devices 2.1 to 2.5. The cutting devices 2.1 to 2.5 each comprise a pair of knives 4, with a lower knife device 5 and an upper knife device 6. The lower knife device 5 comprises a supporting lower knife 15 and the upper knife device 6 comprises an upper knife 15 that is adjustable and plunges in the direction of the lower knife. The cutting devices 2.1 to 2.5 can assume at least one "operating state", whereby a distinction is usually made or switched between a "cutting state" and a "waiting state". In the "cutting state", the cutting device is engaged with the material web 3 and cuts it; in the "waiting state", the cutting device is disengaged so that no cut is produced in the material web 3. At least three cutting devices are in a cutting state.

[0082] The knife pair 4 in Figure 1 is designed, by way of example, as a rotating circular knife pair comprising an upper knife 15 and a lower knife 14. The two knives 14, 15 are each rotatably and / or drivably mounted on their own knife holder 11, 12. The knife holders 11, 12 are further adjustably connected to a carriage 7, 8 each. The knife holders 11, 12 enable the upper knife 15 to be moved out of a material web 3. In this case, the corresponding cutting device positioned at a "cutting position" S1 to S9 is transferred from a "cutting state" to a "waiting state". The upper knife is usually moved out essentially orthogonally to the material web surface. The control unit 21 controls the operating state of the cutting devices.Furthermore, adjustments of the knives in terms of immersion depth, angle of attack to the material web and contact pressure are possible by means of the knife holders 11, 12; these can either be adjusted manually by the operator or automatically controlled by the adjustment device and the control unit.

[0083] The carriages 7, 8 comprised in the lower and upper knife devices 5, 6 are each adjustably mounted on an associated knife crosshead 9, 10. The carriages 7, 8 are controllable via at least one adjusting device 17, 18 via a control unit 21 and are adjustable transversely to the running direction L of the material web 3, in the material web width direction.

[0084] If the cutting device is in a “cutting state”, the cutting device is in engagement with the material web 3 and performs a cut S, preferably a longitudinal cut S, in the material web 3.

[0085] If the cutting device is in a “waiting state”, the cutting device is usually not in engagement with the material web 3 and does not perform a cut S, preferably no longitudinal cut S, in the material web 3.

[0086] Advantageously, the edge trimming is carried out by the cutting devices 2.1, 2.5 included in the longitudinal cutting device 2, positioned at the edge and designed such that they cut at least one edge strip 16 from the outer partial webs or the material web. The cutting devices 2.1, 2.5 suitable for edge trimming are also referred to as so-called edge cutting devices 2.1, 2.5. The resulting superfluous or unnecessary edge strips 16 are fed via a discharge device 24 to a fabric dissolver, pulper, shredding fan or suction device (not shown) for recycling. The discharge device 24 can comprise simple mechanical elements designed as guide or guiding elements and / or additional elements such as, for example, another edge strip suction device.

[0087] Figure 1 also shows at least two guide rollers 25, over which the material web 3 is guided across its entire width before and after the slitting device 2 and simultaneously supported. This advantageously avoids possible vibrations of the running material web 3 in the area of ​​the slitting device 2. The material web 3 is usually drawn off from an upstream master roll (not shown) and cut by the slitting device 2, in which the material web 3 is produced into partial webs I to VII. The partial webs are then wound onto their own separate winding core or winding tube (not shown) to form finished rolls. The beginning of a finite section of a partial web is connected to a new winding core and then spanned by continuous winding to form so-called material web layers.The dimension of the winding cores in the transverse direction of the material web 3 corresponds to the corresponding widths of the partial webs I to VII. The winding cores or winding sleeves of the finished rolls are usually located next to each other in the transverse direction in a common theoretical winding axis, but it is also conceivable that the winding axes of the finished rolls are located in different positions in the running direction and / or in different height positions relative to each other.

[0088] Figure 1 also shows a coupling element 19, which is included in an edge-cutting device and establishes a connection between the upper knife device 6 and the lower knife device 5. The coupling element 19 is firmly connected to the upper knife device 6 and the lower knife device 5, yet is detachably connected for maintenance purposes. The coupling element 19 is designed such that it is firmly and detachably connected to a sufficiently large, fixed area of ​​the lower and upper knife devices 5, 6, which are movable transversely to the running direction L, in order to achieve stable fastening and coupling of the lower and upper knife devices.

[0089] In other alternative embodiments, it is also conceivable, for example, to select components included in the lower and upper knife devices 5, 6 as a fastening point. Among these, it would be conceivable to use the carriages 7, 8 of the lower and upper knife devices and / or a fixed part of the knife holders 11, 12 as a fastening point. Furthermore, an intermediate connection of the coupling element 19 to a guide element 20 would also be conceivable, which in turn are fastened to one of the above-listed locations on the lower and upper knife devices 5, 6. An example of a coupling could be: carriage 8 of the upper knife device 6 to coupling element 19, coupling element 19 to guide element 20, guide element 20 to knife holder 11 of the lower knife device 5.

[0090] The resulting coupling is statically rigid and adjustable, preferably synchronously, with the lower and upper knife devices 5, 6 transversely to the running direction L of the material web 3. The coupling element 19 enables fixed synchronization of the adjustment of both knife devices 5, 6. The coupling element 19 also enables the distribution of the adjustment force required for adjustment by the adjusting devices 17, 18. The adjustment of both knife devices 5, 6 can be handled entirely by one adjusting device 17, 18 or only partially. For example, only the adjusting device 17 of the lower knife device 5 adjusts the knife pair 4, or only the adjusting device 18 of the upper knife device 6, or the adjusting device 17 of the lower knife device 5 shares the required adjustment force proportionally, for example, half each, with the adjusting device 18 of the upper knife device 6.

[0091] In a further embodiment not shown, it is conceivable that at least one separate adjusting device 17 or 18 is provided for each edge-cutting device. The separate adjusting device on the edge-cutting devices 2.1, 2.5 can be designed, for example, as a mechanical spindle drive.

[0092] Furthermore, Figure 1 shows, by way of example, an embodiment with two guide elements 20, a first guide element 20 and a second guide element 20b. The first and second guide elements enable secure guidance of the cut-off edge strip 16. A first guide element 20 is located below the material web 3 or on the side of the material web 3 where the lower knife device 5 is located, and the second guide element 20b is located above the material web 3 or on the side of the material web 3 where the upper knife device 6 is located. The material web 3 and the cut-off edge strips 16 run between the first and second guide elements 20, 20b before the edge strip 16 is guided into the discharge device 24.

[0093] In one exemplary embodiment, the second guide element 20b can be fixedly and / or movably connected to the coupling element 19 and / or in another embodiment to the lower blade device 5 and the upper blade device 6, preferably to the carriages 7, 8. In Figure 1, the first guide element 20 is fixedly connected to the carriage 7 of the lower blade device 5 and the coupling element 19. The second guide element 20b is movably connected to the coupling element 19, in particular rotationally about the connection point of the coupling element 19 to the second guide element 20b.

[0094] Figure 2 shows a chronological sequence of how the partial webs I to IV before a format change 13 and the partial webs V to VII after a format change 13 with the freely selectable width formats Bi to Bvn are cut lengthwise in the running direction L from the material web 3 and wound up into new finished rolls in a downstream winding device (not shown).

[0095] The longitudinal cutting device 2 can be engaged or in the cutting state during all process states, but an adjustment 23 of the cutting devices usually takes place when the machine is at a standstill and the cutting device is disengaged or placed in a standby state.

[0096] Advantageously, the adjustment 23 of the edge cutting devices 2.1, 2.5 is carried out with a moving material web 3, at speeds greater than 10 m / min, in particular greater than 40 m / min, particularly preferably greater than 80 m / min of the material web 3. It is necessary for the edge cutting device to be in the cutting state and to cut the material web 3.

[0097] During acceleration, deceleration or at production speed, the cutting devices are usually kept constant in their position and operating state.

[0098] The control unit 21 ensures that, depending on the operating state of the roll cutting machine 1, the cutting devices 2.1, 2.2, 2.3, 2.4, 2.5 are in the correct cutting positions S1 to S9 and in the correct operating state (cutting state or standby state), which means that the respective cutting devices 2.1 to 2.5 are in the correct target position in the transverse direction of the material web 3 and / or the cutting device is in or out of engagement with the material web.

[0099] In an alternative embodiment, a sensor integrated into the slides 7, 8, in particular a magnetic sensor rod, reports the respective position of the slides back to the control unit 21, which can be used as an input signal for adjustment.

[0100] In the exemplary representation of Figure 2, the cutting devices 2.1, 2.5 carry out the edge trimming 16.1, 16.2, 16.3, 16.4 and are therefore referred to as edge cutting devices 2.1, 2.5.

[0101] In the initial state, a first cutting pattern or a first format is produced by the longitudinal cutting device 2 and the cutting devices 2.1 to 2.5. The cutting devices 2.2 to 2.4 are positioned at the cutting positions S2 to S4 and each create a longitudinal cut and cut the partial webs I to IV from the undivided material web 3. The edge cutting devices 2.1, 2.5 cut the edge strips 16.1 and 16.2 from the partial webs I and IV located at the edge or the material web 3 simultaneously with the cuts S1 and S5. The edge strips 16.1 and 16.2 move like the rest of the material web 3 and the partial webs I to IV in the running direction L, and the cutting devices 2.1 to 2.5 remain stationary in the running direction L in the longitudinal cutting device 2. The illustration in Figure 2 shows a temporal sequence or movement of the material web 3 in the running direction L. The stationary cutting devices 2.1 to 2.5 and the associated components are in the same position relative to the running direction L of the material web within the roll cutting machine.

[0102] The edge strips 16.1 and 16.2 are guided into the discharge device 24 via the at least one guide element 20 essential to the invention. The guide elements 20 are advantageously fixedly connected to at least one carriage 7, 8 of the respective edge cutting device 2.1, 2.5 or the coupling element 19 and are adjusted transversely to the running direction L synchronously with the edge cutting device, enabling reliable discharge of the edge strip 16 into the discharge device 24.

[0103] The coupling element 19, which is essential to the invention, connects the lower knife device 5 to the upper knife device 6, thus enabling a precisely synchronous adjustment 23 when the edge cutting device 2.1, 2.5 is engaged. A precisely synchronous adjustment is particularly advantageous because a deviation of just a few millimeters between the two knife devices can lead to an interruption of the longitudinal cut, thus preventing the edge strip from being fed into the pulper. In a minor case, this typically leads to a further downtime of the slitter-winder or, in a severe case, to a web break with further consequences.

[0104] Once the desired diameter of the wound finished rolls of partial webs I to IV has been reached, a format change 13 can be carried out. Figure 2 shows by way of example how the cutting device 2.3 produces a cut S3 in accordance with the prior art, is disengaged when the material web 3 comes to a brief standstill, and the cutting device 2.3 undergoes an adjustment 23 transversely to the material web 3, here to the right, and is re-engaged with the material web 3. When the movement of the material web 3 is resumed, the new cut S8 is produced after the format change 13, which now divides the new partial webs VI, VII from one another.

[0105] In this example, cutting device 2.2 creates cut S2 before the format change 13, and this cut is not adjusted during the format change. After the format change, cutting device 2.2 creates the new cut S7 at the same position and divides the new partial webs V and VI.

[0106] The cutting device 2.4, which cuts the partial webs III and IV in a first format prior to the format change 13, is in this example disengaged or placed in a standby state during the format change 13. After the format change, the cutting device 2.4 does not cut the material web 3 in a second, new format and remains in its previous cutting position S4 until further notice. Further details of the edge trimming in Figure 2 are described in the enlarged, more detailed Figure 3.

[0107] Figure 3 shows an enlarged view of the corresponding marginal edges 16.1, 16.2, 16.3, 16.4 of Figure 2 during a format change 13. In an alternative embodiment, the required time range and material web section before the format change is designated 13.1 and the range after the format change is designated 13.2.

[0108] For ease of explanation, the adjustment 23 of the edge cutting devices 2.1, 2.5 in this example is advantageously carried out in the same direction transverse to the running direction L, here to the left to a new position shown in dashed lines. However, the adjustment 23 of the edge cutting devices 2.1, 2.5 depends on the desired formats of the finished rolls and the available width of the undivided material web 3 and can therefore be carried out individually, independently of one another, and continuously.

[0109] In Figure 3, the edge strip 16.1 is divided from the partial web I by the edge cutting device 2.1 with a cut S1 before the format change 13. And from its original starting width in a first format, to a smaller width of the edge strip 16.3 after the format change 13 in a second, new format, adjusted by the distance 32 transverse to the running direction L. The new edge strip 16.3 is divided from the new partial web V by the continued cut S6 by the edge cutting device 2.1 in the new cutting position S6.

[0110] The edge strip 16.2 before the format change 13 is separated from the partial web IV with a cut S5 by the edge cutting device 2.5. And from its original starting width in a first format, to a larger width of the edge strip 16.4 after the format change 13 in a second, new format, adjusted by the distance 32 transverse to the running direction L. The new edge strip 16.4 is thereby separated from the new partial web VII by the continued cut S9 by the edge cutting device 2.5 in the new cutting position S9. In the illustration in Figure 3, the same distance 32 of the adjustment 23 of both edge cutting devices is assumed for the sake of simplicity; however, this distance can expressly also have different adjustment ranges for each edge cutting device. All edge strips 16.1 to 16.4 are advantageously guided into the discharge device 24 via the at least one guide element 20 in the direction of the arrow.

[0111] In a possible alternative advantageous embodiment, the edge cutting devices 2.1, 2.5 are adjusted while the material web 3 moves in the running direction L. The edge cutting devices 2.1, 2.5 are engaged and the enclosed knife pairs 4 are in operation. The adjustment speed and the adjustment range 32 to be covered by the edge cutting devices 2.1, 2.5 transverse to the running direction L, in combination with the movement speed of the material web 3 in the running direction L, result in a transition cutting line S1 - S6 and / or S5 - S9. This creates a format change area 13.1 before the format change 13 and a format change area 13.2 after the format change 13, which is determined by a length 31 in the running direction L of the material web 3. Furthermore, this results in an adjustment angle 30, which represents an angle of the transition cutting line S1 -S6 and / or S5-S9 to the running direction L.

[0112] In a possible alternative advantageous embodiment, the speed in the transverse direction of the adjustment 23 is set such that an adjustment angle 30 of less than or equal to 45°, in particular less than or equal to 30°, in particular preferably substantially 30°, to the running direction L. Using this possible parameter of the adjustment angle 30, the control unit 21 can determine the correct adjustment speed in combination with the web speed. The adjustment angle 30 corresponds to a speed of the adjustment 23 of the edge cutting devices 2.1, 2.5 transverse to the running direction L of the material web 3 of less than or equal to 100%, in particular less than or equal to 56%, in particular preferably substantially 56%, of the speed of the material web 3 in the running direction L.

[0113] If the adjustment 23 of the edge cutting devices 2.1 is carried out from a larger initial width of the edge strip 16.1 before the format change 13 to a smaller width of the new edge strip 16.3 after the format change 13, the adjustment 23 is only carried out after the format change time 13 has been reached, while the material web is still in motion. A format change 13 carried out in this way results in an area 13.2 on the material web after the format change, creating a short material web section 33 or transition material web section with a variable width. The material web section 33 is advantageously wound up with the first or inner material web layers of the new partial web V.

[0114] This has the advantage that the material web section 33 which is not actually to be used is wound up with the first inner layers of a new finished roll, which is sorted out as rejects by the user of the finished rolls by means of an adhesive or traces of the transfer using the transfer techniques usually used.

[0115] If the adjustment 23 of the edge cutting devices 2.5 is carried out from a smaller initial width of the edge strip 16.2 before the format change 13 to a larger width of the new edge strip 16.4 after the format change 13, the adjustment 23 is carried out before the format change time 13 is reached, while the material web is still moving. A format change 13 carried out in this way results in an area 13.1 on the material web before the format change, creating a material web section 34 or transition material web section with a variable width. The material web section 34 is advantageously wound up with the last or outer material web layers of the old partial web IV.

[0116] This has the advantage that the material web section 34 which is not actually to be used is wound up with the last outer layers of an old, almost completely wound up finished roll. Here too, the end layer is usually glued or otherwise fastened to the previous layer and these layers are also usually sorted out as rejects by the user of the finished roll.

[0117] Figure 4 shows a further alternative embodiment of at least one guide element 20. The guide element 20 is designed with perforations 40 in at least one region 41, 42. The perforations 40 are designed as through-openings 40 and enable an air flow through the guide element from a side facing away from the material web to the side of the guide element 20 on which the material web and / or the edge strip 16.1, 16.2, 16.3, 16.4 moves. The air flow formed through the through-openings 40 enables the stabilization of the separated edge strip 16 and reduces its tendency to flutter, particularly at production speeds.This is achieved by a negative pressure generated by the moving material web 3 and / or edge strip 16 on the side of the guide element facing the material web. The air flow generated by the negative pressure forms a stable air boundary layer or an air cushion between the material web 3 and / or edge strip 16 moving above the guide element, which can periodically break off if there are no through openings.

[0118] In an alternative embodiment, the guide element 20 comprises at least two differently designed regions 41, 42 with different shapes, sizes and / or distributions of the through-openings 40. It is particularly advantageous if the region 42 following the cutting position 2.1, 2.5 in the running direction L has a narrower and / or larger air flow rate of the through-openings 40 arranged in this region 42 than the region 41 remote from the cutting position in the transverse direction. Such a distribution of the through-openings 40 is particularly advantageous with smaller widths of the edge strip 16 and advantageously counteracts the additional turbulence caused by the rotation of the pair of knives.

[0119] In a further alternative embodiment, the at least one guide element 20 comprises at least a first perforated region 41 and a second perforated region 42 with through-openings 40, wherein the second region 42 has at least a 50% higher air flow rate per unit area, particularly preferably more than 25%, than the second perforated region 41. Due to the increased turbulence downstream of the edge cutting device 2.1, 2.5, viewed in the running direction L, an increased air requirement is necessary to form a stable air boundary layer, as well as a more detailed, higher-resolution distribution of the through-openings in order to reliably remove even smaller widths of the edge strips. The through-openings 40 can have different shapes, sizes and / or distributions, in particular circular, elliptical, oval, square, rectangular, square-rounded and / or rectangular-rounded shapes.The distribution of the through openings can be evenly distributed and / or chaotically distributed; it is also possible for the through openings to be offset from one another and / or in alignment.

[0120] The number and dimensions, in particular the diameter or passage area, of the through-openings 40, the transverse spacing 43, and the longitudinal spacing 44 of the through-openings are to be selected such that a sufficient flow rate of air into the air boundary layer is achieved. The spacings 43 and 44 are shown in Fig. 4a as an enlarged section of the perforated area from Fig. 4.

[0121] The holes can be arranged in series, as shown for example in the second area 42, and / or offset from one another, as shown in the first area 41. A staggered arrangement is particularly advantageous for achieving a more even distribution of the air.

[0122] In a further alternative embodiment, the guide element 20 is connected to a fan via through-openings 40, and the through-openings 40 are actively supplied with a controllable air flow, thus forming an actively controllable air boundary layer.

[0123] 1 roll cutting machine Longitudinal cutting device

[0124] 2.1 , 2.2, 2.3, 2.4, 2.5 Cutting device

[0125] 3 Material web

[0126] 4 pairs of knives

[0127] 5 Lower knife device

[0128] 6 Upper knife device

[0129] 7, 8 sleds

[0130] 9, 10 knife traverse

[0131] 11 , 12 knife holder

[0132] 13 Format change time or position

[0133] 13.1 Area before the format change

[0134] 13.2 Area after the format change

[0135] 14 knives (upper knife, plunging knife)

[0136] 15 knives (lower knife, counter knife, pot knife)

[0137] 16 verge strips

[0138] 16.1 , 16.2 Margin strip before format change, first format

[0139] 16.3, 16.4 Margin strips after format change, second format

[0140] 17, 18 Adjusting device

[0141] 19 Coupling element

[0142] 20 guide element

[0143] 20b Second guide element, guide baffle

[0144] 21 Control unit

[0145] 22 imaginary common cutting plane

[0146] 23 Adjustment direction of the cutting devices (arrow)

[0147] 24 discharge device

[0148] 25 Guide roller

[0149] 30 adjustment angles

[0150] 31 Format change area in the direction of travel of the material web

[0151] 32 Format change area across the material web

[0152] 33 Material web section on inner layers

[0153] 34 Material web section on outer layers 40 Through opening

[0154] 41 Area with fewer passage openings per area

[0155] 42 Area with more passage openings per area

[0156] 43 Distance of the passage openings in the transverse direction

[0157] 44 Distance of the passage openings in the longitudinal direction

[0158] BI, BII, BIH, BIV, BV, BVI, BVII Width of the individual lanes

[0159] L Direction of travel (arrow)

[0160] I, II, III, IV partial web before format change

[0161] V, VI, VII partial web after format change

[0162] S section, longitudinal section

[0163] S1, S2, S3, S4, S5 cutting line, cutting position before format change

[0164] S6, S7, S8, S9 cutting line, cutting position after format change

Claims

Patent claims 1. Method for longitudinally slitting and winding a running web of material (3), in particular a paper or cardboard web, in a roll slitting machine (1) into several finished rolls formed from individual layers of material, by means of a longitudinal slitting device (2) comprising at least three cutting devices (2.1, 2.2, 2.3, 2.4, 2.5), each comprising a pair of knives (4) with a lower knife device (5) and upper knife device (6), wherein the at least three cutting devices each produce a longitudinal slit (S) in the running web of material (3) in a first cutting position (S1, S2, S3, S4, S5) in a first format before a format change (13), and wherein an adjustment (23) of at least one cutting device (2.1, 2.2, 2.3, 2.4, 2.5)5) transverse to a running direction (L) of the material web (3), and wherein, after the format change (13), at least one longitudinal cut (S) is produced at a second, new cutting position (S6, S7, S8, S9) in a second, new format, and wherein at least one, preferably two, of the at least three cutting devices (2.1, 2.2, 2.3, 2.4, 2.5) is designed as an edge cutting device (2.1, 2.5) and cuts off at least one edge strip (16, 16.1, 16.2, 16.3, 16.4), and wherein the at least one edge strip (16, 16.1, 16.2, 16.3, 16.4) is guided into at least one discharge device (24), characterized in that the at least three cutting devices (2.1, 2.2, 2.3, 2.4, 2.5) cut the material web (3) in an imaginary, common plane (22), and that the adjustment (23) of the at least one edge cutting devices (2.1 , 2.5) takes place while the material web (3) is running.

2. Method according to claim 1, characterized in that the at least one edge cutting device (2.1 , 2.5) remains continuously in the cutting state during the adjustment (23) from the first cutting position (S1 , S5) to the second cutting position (S6, S9). A method according to claim 1 or 2, characterized in that the adjustment (23) of the at least one edge-cutting device (2.1, 2.5) is carried out at a speed of the material web (3) greater than 10 m / min, in particular greater than 40 m / min, and more preferably greater than 80 m / min. A method according to any of the preceding claims, characterized in that the speed of the adjustment (23) of the at least one edge-cutting device (2.1, 2.5) transverse to the direction of travel (L) of the material web (3) is controlled to be less than or equal to 100%, in particular less than or equal to 56%, and more preferably substantially 56%, of the speed of the material web (3). Method according to one of the preceding claims, characterized in that the adjustment (23) of the at least one edge cutting devices (2.1 , 2.5) from a larger initial width of the edge strip (16.1 , 16.2) before the format change (13), to a smaller width of the new edge strip (16.3, 16.4) after the format change (13), occurring after the format change (13.2) has been reached. A method according to one of the preceding claims, characterized in that the adjustment of the at least one edge-cutting device (2.1, 2.5) from a smaller initial width of the edge strip (16.1, 16.2) before the format change (13), to a larger width of the new edge strip (16.3, 16.4) after the format change (13), occurs before the format change (13.1) has been reached. A method according to claim 5, characterized in that. A variable-width material web section (33) created after the format change (13) is wound with the first or inner layers of a new finished roll of a corresponding sub-web (V). Method according to claim 6, characterized in that a variable-width material web section (34) created before the format change (13) is wound with the last or outer layers of an almost finished roll of the corresponding sub-web (IV). Longitudinal cutting device (2) for cutting a running material web (3), in particular a paper or cardboard web, in a roll slitting machine (1), particularly suitable for carrying out the method according to the preceding claims, comprising at least three cutting devices (2.1, 2.2, 2.3, 2.4, 2.5).5), each comprising a pair of knives (4), wherein each pair of knives (4) comprises a lower knife device (5) supporting the material web (3) and an upper knife device (6) immersing in the material web (3), and wherein all lower knife devices (5) are adjustably mounted transversely to the direction of travel L on a common knife traverse (9) and all upper knife devices (6) are mounted on another common knife traverse (10), and wherein each upper knife device (6) is connectable to an adjusting device (18) and each lower knife device (5) is connectable to an adjusting device (17), and wherein two cutting devices are designed as edge cutting devices (2.1, 2.5) to produce a respective edge strip (16.1, 16.2, 16.3, 16.4), characterized in that the two edge cutting devices (2.1, 2.5) each have at least one coupling element (19) between the The upper blade device (6) and the lower blade device (5) comprise. and that the two edge cutting devices (2.1 , 2.5) each comprise at least one guide element (20) for the cut edge strip (16.1 , 16.2, 16.3, 16.4).

10. Longitudinal cutting device (2) according to claim 9, characterized in that the at least one mechanical guide element (20) can be connected to the lower knife device (5), the upper knife device (6) and / or the coupling element (19) in a fixed or rigid manner, in particular by a mechanical coupling rod, such that synchronization of the upper knife device (6) and the lower knife device (5) and adjustment transverse to the direction of travel (L) is enabled.

11. Longitudinal cutting device (2) according to claim 9 or 10, characterized in that the adjusting device (18) of all upper knife devices (6) is designed as a single circulating belt drive (18) which enables adjustment on the common knife traverse (10) of the upper knife devices and the adjusting device (17) of all lower knife devices (5) is designed as a single circulating belt drive (17) which enables adjustment on the common knife traverse (9) of the lower knife devices.

12. Longitudinal cutting device (2) according to one of the preceding claims, characterized in that the longitudinal cutting device (2) comprises a measuring system, preferably at least one magnetic sensor rod, suitable for determining the position of each cutting device (2.1 , 2.2, 2.3, 2.4, 2.5) transversely to the direction of travel (L).

13. Longitudinal cutting device (2) according to one of the preceding claims, characterized in that the at least one guide element (20) comprises at least one perforated area (41, 42) with through openings (40), designed such that a stable air boundary layer can form between the edge strips (16.1, 16.2, 16.3, 16.4) and the perforated area of ​​the guide element (20). Longitudinal cutting device (2) according to one of the preceding claims, characterized in that the at least one guide element (20) comprises at least a first perforated area (41) and a second perforated area (42) with through-openings (40), wherein the second area (42) is designed such that at least 50% higher air flow rate per unit area, particularly preferably more than 25%, than the second perforated area (41). Longitudinal cutting device (2) according to one of the preceding claims, characterized in that the two edge cutting devices (2.1 , 2.5) each comprise a first guide element (20) and a second guide element (20b), wherein the second guide element (20b) is designed as a guide plate (20b) and is designed such that the edge strip (16.1 , 16.2, 16.3, 16.4) between the two guide elements (20, 20b).

Images