DE102022108688A1 - Method and device for positioning edge cutting devices of a longitudinal cutting device for a material web in a roll cutting machine - Google Patents

Abstract

The invention relates to a method and a device for longitudinally 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), which produce at least one longitudinal cut in the running material web (3) in a first cutting position (S1, S2, S3, S4, S5) before a format change (13) in a first format, and 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 after the format change (13) at least one longitudinal cut at a second cutting position (S6, S7, S8, S9) and a second, new format is generated, and 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) in one imaginary, common plane cut the material web (3), 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.

Description

The invention relates to a method for longitudinally 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, and each of which has a pair of knives with a lower knife device and upper knife device, and wherein the at least three cutting devices in the running material web each produce a longitudinal cut in a first cutting position in a first format before a format change, and wherein a stepless 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, of the at least three cutting devices is designed as at least one edge cutting device and cuts off at least one edge strip, and where the edge strip is guided into at least one removal device.

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 of which includes a pair of knives, and each pair of knives has one supporting the material web Lower knife device and an upper knife device immersed in the material web, and all lower knife devices are mounted on a common knife crossbar and all upper knife devices on another common knife crossmember are adjustable transversely to the direction of travel, and wherein each upper knife device can be connected to an adjusting device and each lower knife device can be connected 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.

The invention is explained below in connection with the treatment of a paper web. However, it can also be used with other material webs that can be handled in a similar way. These include, for example, but are not limited to, sheets made of cardboard, cardboard, plastic or metal foils.

Paper webs are produced in relatively large widths of up to over 11 m in a paper machine. The production of the paper web takes place virtually endlessly. The running direction 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 lying in the horizontal material web plane.

At the end of the paper machine, the full width of the paper web produced is wound onto a winding core. This winding core is replaced cyclically, usually during ongoing production. The web-wide winding roll created in this way is usually referred to as a mother roll or solid reel. In order to be manageable for a later user, for example a printing company, the paper web wound on a mother roll must be cut into several parallel partial webs, the widths of which are suitable for the respective later user. These widths can vary greatly from case to case, so that the paper web is usually divided according to an individually definable cutting pattern or format. This is usually done in a downstream slitting machine.

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

The known roll cutting machines, which have several longitudinal cutting devices, produce individual narrower winding rolls or so-called finished rolls from a wide material web of a mother roll. Additional cross-cutting usually produces several sets of finished rolls from one master roll. In order to be able 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.

In a known manner, the pairs of knives, usually in the form of circular knives, each consist of a lower knife, pot knife or counter knife which supports the web during cutting and an upper knife or pointed knife which dips into the web, the cutting edges of which must be positioned exactly relative to one another in the desired cutting position. The lower knife is usually driven, while the pointed knife is mounted so that it can rotate freely as the upper knife. This is, for example, in the German patent specification DE3419843C2 described.

As is known in the prior art, a roll cutting machine is used to cut a material web in the longitudinal direction into sub-webs which usually have a smaller width. These partial webs are wound into so-called finished, shipping, winding or partial rolls in the roll cutting machine and together form a finished roll set, a finished roll throw or a so-called “set”.
The usual process in a roll cutting machine with at least one longitudinal cutting device and a subsequent rewinder is explained using the following example. For the sake of simplicity, we assume that a total of three finished rolls are produced and that the material web is already semi-automatically or fully automatically through the entire system in a known manner is guided into the roll-up and the sleeves there. There, the material web, as soon as it has been divided into partial webs as a result of previous activation of the longitudinal cutting device, is attached to a winding core set or winding core set lying in the winding bed. Now the actual production process can begin, in which the partial webs are wound under tension around the winding cores as finished rolls comprising several layers of material webs.
Once the first set of finished rolls has been completely wound, a first “set change” takes place, i.e. the partial webs are separated transversely to the direction of travel, the finished roll set is ejected and the newly formed beginnings of the partial webs are attached to a new core set. This “set change” usually occurs when the material web is at a standstill.
After the set change-related standstill, production of a second set or a second set of finished rolls is started and completed. Subsequently, the processes listed above are of course repeated again and again. The formats of the finished rolls or the widths correspond to the widths desired and requested by the end customer and can be very different, which is why the finished roll formats in a roll cutting machine can change several times during production, rarely Extreme case 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 longitudinal cutting device in the roll cutting machine are adjusted at the desired distance from one another in the width direction or transversely to the running direction of the material web. This means that the finished rolls are produced in a new, desired width or in a new format.
Once the second set of finished rolls has been completed, in the course of the second set change - usually when the system is at a standstill - a so-called format change, pattern change or width change of the partial web is also carried out. This format change is usually initiated shortly before the end of the second winding process, since depending on the geometry of the slitting machine, a certain length of the material web still has to be guided to the separating device, which separates the web transversely to the direction of travel. The system usually experiences a further standstill, in addition to the second set change-related standstill, since the cutting devices are adjusted when at a standstill. The usual sequence of process states in the winding process is: braking from full production speed; Standstill for format change; Continue driving at crawling speed; Standstill for set change, whereby the material web is also separated transversely to the direction of travel; Creep speed for winding the first layers onto the new winding cores; Accelerate to full production speed.

If a format change has occurred during the second set change, a new set of cores corresponding to the new widths is inserted and a third set of finished rolls is produced with the new format setting. Subsequently, the processes listed above are repeated again.
By adjusting the cutting devices, the cutting setting in the material web is changed. In conjunction with changing the cutting setting of the longitudinal cutting device in a winder, the width of the edge trim can of course also change. The edge trimming or edge strip remaining at the edge of the material web is guided through a discharge device into a pulper or pulper or tearing fan or suction device. When changing the edge strip width during a "format change" after a new and an old cutting setting, a so-called "untrimmed neck" remains between the edge strips, which is torn off by hand by the operating personnel in order to be able to safely transfer the edge strip into the pulper .

A method for changing the knife setting of a roll cutting machine during longitudinal cutting to produce material webs of different widths and at the same time an edge trim is available EP 1313597 A1 known. By using a second automated edge cutting device for edge trimming, in addition to the longitudinal cutting device used, the manual interaction of the operating personnel to remove an edge strip that would otherwise protrude during a format change can be avoided and production capacity can be increased

Today, one goal is to design the slitter rewinder and its associated operations so that their operation requires only one person to control the operation of the slitter rewinder from a control room. Removing the neck between the edge strips slotted after a new and old blade adjustment by tearing a piece out of that tip, as described above, was a manual process, so the other tasks of the slitter rewinder associated with the process had to be interrupted and the slitter rewinder first could start when the “uncircumcised neck” was removed. This reduces the production capacity of the winder. Additionally, an additional worker was often needed to carry out this process, which must be done by hand. This manual operation also poses a risk in terms of worker safety as it is carried out in a dangerous location close to cutting equipment. In order to be able to carry out at least one format change in the material web, also known as a pattern change, the reel cutting machine must be switched off. With the material web immediately standing, at least one pair of knives is then moved out of the material web, positioned at the new cutting position by means of at least one adjusting device and then retracted into the material web. The roll cutting machine can now be put back into operation.

Unfortunately, this currently used method for changing a cutting pattern or format has the major disadvantage that, on the one hand, the rewinder has to be switched off and, on the other hand, a lot of time is required for the change mentioned.

“Format change” is understood as a process step of adjusting the cutting devices transversely to the direction of travel from an old cutting position to a new cutting position. At least one time range and one material web area in the running direction of the material web are assigned to this process step or the format change. The at least one time range can include different process steps for adjusting the cutting devices. The time range of the format change usually begins from the point in time at which at least one cutting device changes the operating state or the adjustment transversely to the running direction of the material web begins. For example, the format change time range can extend from the change in the operating state of at least one cutting device, preferably to a waiting state, the adjustment of the cutting device transversely to the direction of travel to the renewed change in the operating state of the at least one cutting device, preferably to a cutting state. Alternatively, it is possible that the format change time range begins from the time at which an adjustment transversely to the direction of travel begins from an old, previous cutting position and ends when a new cutting position is reached.
Furthermore, the format change is assigned a material web area or an area in the running direction of the material web, in which the adjustment of the cutting positions is usually located. This material web area can minimally only assume a line or position transverse to the running direction on the material web when the material web is at a standstill, or in the case of a material web moving at a speed, an area with an extent or length in the running direction can be assigned.

The object of the invention is to provide an improved method for automatic format change and an improved slitting device, in particular for a slitting machine, which reduces the required number of slitting devices and the method for format changing in complexity and cost.
A further object of the invention is to implement the above-mentioned objective not only for new slitting machines, but also particularly advantageously for the modernization of existing, older slitting machines with an existing slitting device defined in the preamble. The utilization of the roll cutting machine can be advantageously increased through modernization while at the same time keeping investment costs low. In addition, time-consuming manual interaction when changing formats, which is risky for the operating personnel, is no longer necessary during operation, which is usually still necessary with these older systems.

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

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 devices takes place while the material web is running.

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 in engagement 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 running results in a cut at a certain angle in the running direction tion of the material web, which deviates from the longitudinal cutting direction in its orientation in the plane of the running direction and transversely to the running direction.
This advantageously eliminates the need for manual interaction by the operating personnel when changing formats.
Advantageously, the time required for the format change can be shorter because 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.

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

In a further alternative embodiment, the edge cutting devices are adjusted 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.
Advantageously, a reliable and safe adjustment of the edge cutting devices can be carried out in the cutting state at a speed of the material web of greater than 10 m/min. A constant creep speed greater than 10 m/min is preferably selected. Furthermore, the time required for adjusting the edge cutting devices for the changing process can advantageously be further optimized in that the adjustment of the edge cutting devices can take place when the material web is braked from production speed, i.e. in a transient process state, and is thus relocated to an area of the winding process, which is usually carried out by Non-format change-related parameters such as inertial masses of the mother or finished rolls are determined and thus the time required at creep speed for adjustment can be further reduced or eliminated.

In a further alternative embodiment, a speed of adjustment of the edge cutting devices transversely 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, at 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 become too blunt or the adjustment speed too high, as this will have a negative impact on the safe removal of the edge strip. Furthermore, the cutting device with corresponding lower and upper knife device remains oriented in the material web plane with its preferred orientation in the longitudinal direction. An adjustment with the above parameters transversely to the running direction does not lead to a build-up of the material web on the cutting device and/or an interruption of the longitudinal cut, despite a deviation from the optimal cutting direction in the longitudinal direction. In an alternative embodiment, a further degree of freedom for the cutting device for adjusting the lower knife device and 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.

In a further alternative embodiment, when the at least one edge cutting devices are adjusted, the control is carried out in such a way that a length of a material web area for the format change of a maximum of up to 1 m, in particular up to 0.5 m, is set.
This means that a minimum permissible speed for the adjustment of the edge cutting devices can result depending on the material web speed and the desired change in the distance of the positions transverse to the running direction.

The time required for adjustment during the format change ideally leads to a limitation of the expansion of the change area in the running direction and thus to a reduction in the cut caused by the cut not being carried out in the longitudinal direction. The first 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 meters of the almost completely wound finished rolls or the last outer layers, are usually marked as scrap for further production because, for example, there are possible splices or other contamination find, and usually the first and last meters of a finished roll are handled as scrap for technical reasons to ensure clean threading. The material web area of the format change in the running direction is therefore in the usual scrap area and therefore does not have a negative impact on production.

In a further alternative embodiment, the at least one edge cutting devices are adjusted 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, after the format change has been achieved.
Furthermore, in a further alternative embodiment, a format change occurs The material web section, which has a variable width, is wound up with the first or inner material web layers of a new finished roll of a corresponding partial web.
Furthermore, in a further alternative embodiment, a speed of adjustment of the edge cutting device of less than or equal to 100% is set.
Advantageously, the adjustment speed when moving out the cutting device can be chosen to be higher to a smaller width of the edge strip due to a lower risk of paper jamming.

In a further alternative embodiment, the at least one edge cutting devices are adjusted 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, before the format change is reached.
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, before reaching the format change, a through the format - Alternating material web section with a variable width is wound up with the last or outer material web layers of an almost finished roll of the corresponding partial web.
In a further alternative embodiment, a speed of adjustment of the edge cutting device of less than or equal to 56% is set.
Advantageously, the adjustment speed of the edge cutting device can be chosen to be lower to a greater width of the edge strip, i.e. when adjusting towards the center of the material web, due to a higher risk of paper jamming, with 56% of the material web speed being shown to be optimal.

In a further alternative embodiment, the adjustment of the edge cutting devices during a format change is automatically controlled by a control device on the roll cutting machine.

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 edge strip.
Advantageously, the otherwise usual, separate edge cutting device for edge strip trimming is integrated into a single longitudinal cutting device, and thus the complexity and costs can be significantly reduced.
Advantageously, the integration into an imaginary knife plane, which extends transversely to the direction of travel and the centers of rotation 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 be reduced; Furthermore, the number of removal devices required for the edge strip and/or in the event of a new performance or a web break can be used in the slitting machine, which thereby reflects further savings and reduction in complexity and thus also less maintenance costs.

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

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, such that synchronization of the upper knife device and the lower knife device is made possible and an adjustment transverse to the direction of travel is made possible.
In a further alternative embodiment, the at least one coupling element is designed as a mechanical coupling rod.

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.

In a further alternative embodiment, the longitudinal cutting device comprises a measuring system, preferably at least one magnetic sensor rod, in particular for determining the absolute position of each cutting device transversely to the direction of travel.
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 transversely to the direction of travel.

In a further alternative embodiment, the edge cutting devices comprise a Adjustment range up to 750mm, in particular up to 500mm, from the respective edge of the material web to the middle of the material web.

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 direction of travel, preferably each its own, separate electric linear drive and/or electric drive with a gear wheel guide.

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 bedknife devices. Advantageously, all lower knife devices comprise a common, single adjusting device transverse to the running direction and all upper knife devices a common, single adjusting device transversely to the running direction, in particular preferably each having a common, web-wide rotating belt drive, preferably each comprising a web-wide running toothed belt.
In a possible embodiment of the adjusting device with a web-wide revolving belt drive, preferably web-wide revolving toothed belt, the carriages of the upper knife device and the carriages of the lower knife device are designed such that a controllable, positive connection of the carriages with the web-wide revolving belt drive for adjustment can be made possible. In an alternative embodiment, the belt drive, which runs the width of the web, is designed as an endless belt, in particular an endless toothed belt, which runs the width of the web in a direction transverse to the direction of travel. 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 on the edge of the longitudinal cutting 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 the width of the web is chosen so that both the left and right moving sections of the circulating belt are guided through all carriages of the corresponding upper knife device or through all carriages of the lower knife device at the same time. Each carriage includes a controllable locking system, which makes it possible to connect either to the section moving to the left or to the section moving to the right of the web-wide belt of the corresponding adjusting device. The connection takes place between the carriage and the adjusting device, preferably through a positive connection. This enables the carriage of the upper knife device or the carriage of the lower knife device, depending on the adjustment direction, to have a positive, controllable connection with the section of the web-wide and endlessly rotating belt of the respective belt drive running in the respective direction.
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.
Furthermore, while maintaining the direction of movement of the one belt drive of the upper knife devices and the one belt drive of the lower knife devices, it is advantageously possible to simultaneously adjust one upper knife or lower knife device to the left and another upper knife or lower knife device to the right, using a single common belt drive. In this case, for example, a first of two upper knife devices connects to the section of the web-wide revolving belt moving to the right and the second upper knife device connects to the left-moving section of the same web-wide revolving band. This enables a simultaneous adjustment of the first upper knife device to the right and the second upper knife device to the left.

In an alternative embodiment, the at least one edge cutting device is designed with a coupling element such that only the upper knife device included or only the lower knife device included 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 includes its own, separate adjusting device, which is arranged separately from the remaining cutting devices.
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 only adjusts one edge cutting device.
In a further embodiment, it is conceivable that the edge cutting device comprises two separate adjusting devices, such that the upper measurement The servo device and the lower knife device can each be adjusted by a separate adjusting device.

In a further alternative embodiment, the control devices are connected to a control device.

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

In a further alternative embodiment, the at least one guide element comprises at least a first perforated area and a second perforated area with through openings, the second area having at least a 50% higher flow rate of air per unit area, particularly preferably more than 25%, than the second perforated area having. Advantageously, the flow rate in the area of the longitudinal cut is increased and the distributions are more highly resolved in order to transport even narrower edge strips stably and without a tendency to flutter.

In a further alternative embodiment, the through openings are designed so that they are 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 guide plate and is designed such that the edge strip runs between the two guide elements. Advantageously, the edge cutting device includes a second guide element, which can provide further support for the edge strip from an opposite side of the material web. The second guide element designed as a guide baffle can be designed to be less stable and solid than the first guide element in order to promote rotational mounting of the guide baffle, which enables the guide baffle and the edge strip to have a certain degree of flexibility in order to prevent any edge strip tears due to one to reduce rigid execution.

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 crossbar extending transversely to the direction of travel of the material web, and these each comprise a knife holder for storing the associated knife.

“Automatic” means that during normal operation of the roll cutting machine there is no manual interaction by the operating personnel in order to change the format of the widths of the finished rolls.

“Adjustment” is understood to mean an adjustment of at least one cutting device included in a longitudinal cutting device transversely to the running direction of the material web. The adjustment is infinitely variable without, for example, a grid. The adjustment range extends at least over the entire width of the longitudinal cutting device and thus usually over the width of the material web.

The “adjustment angle” is understood to mean the angle between the running direction of the material web and the resulting cutting line in the plane of the material web. This results from an adjustment carried out over a certain period of time from a first to a second cutting position of the cutting device transverse to the direction of travel and a material web moving at the same time. The distance of the format change adjusted in the direction of travel corresponds to the adjacent side and the distance of the opposite side adjusted transversely to the direction of travel corresponds to the adjustment angle, which can therefore 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 in the transverse direction to the material web.

A “control” here is understood to mean the entirety of the functional components and their connections required to carry out control and regulation tasks. This includes control devices, regulators, devices for recording actual values, disturbance variables and adjusting devices as well as their connections to one another.

The invention is explained below with reference to figures. The invention also expressly extends to those embodiments which are not given by combinations of features from explicit references to the claims, with which the disclosed features of the invention can be combined with one another - to the extent that this makes technical sense.

Corresponding elements of the exemplary embodiments in the figures are provided with the same reference numbers. The functions of such elements in the individual figures correspond to one another unless otherwise described it does not lead to contradictions. A repeated description is therefore omitted. It is also pointed out that the different features of the exemplary embodiments shown can be exchanged and combined with one another. The invention is therefore not limited to the combinations of features shown in the exemplary embodiments shown.

• 1 Eine vereinfachte und schematische Seitenansicht des Aufbaus einer Längsschneidevorrichtung für eine Rollenschneidemaschine.
• 2 Eine vereinfachte und schematische Draufsicht auf eine in Laufrichtung bewegenden Materialbahn mit einem beispielhaften Format-Wechsel der Schneidevorrichtungen in einer Längsschneidevorrichtung, den dazugehörigen Teilbahnen, Randstreifen und der sich ergebenden Schnitte in der Materialbahn.
• 3 Eine vergrößerte Darstellung der Randbereiche der 2 mit den Parametern für die Verstellung der Randschneidevorrichtungen.
• 4 Eine Darstellung eines perforierten Führungselementes zur Stabilisierung der Randstreifen.
• 4a Eine Vergrößerung des perforierten Bereiches des Führungselementes.

The figures show in detail:

• 1 A simplified and schematic side view of the structure of a slitting device for a slitting machine.
• 2 A simplified and schematic top view of a material web moving in the running direction with an exemplary format change of the cutting devices in a longitudinal cutting device, the associated partial webs, edge strips and the resulting cuts in the material web.
• 3 An enlarged view of the edge areas of the 2 with the parameters for adjusting the edge cutting devices.
• 4 A representation of a perforated guide element to stabilize the edge strips.
• 4a An enlargement of the perforated area of the guide element.

1 shows a longitudinal cutting device 2 for a roll cutting machine 1 comprising five cutting devices 2.1 to 2.5. The cutting devices 2.1 to 2.5 each include 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 includes an immersing upper knife 15 that can be adjusted in the direction of the lower knife. The cutting devices 2.1 to 2.5 can assume at least one “operating state”, a distinction is usually made between an “cutting state” and a “waiting state” or switching. In the “cutting state” the cutting device is in engagement with the material web 3 and cuts it; in the “waiting state” the cutting device is disengaged in such a way that no cut is produced in the material web 3. There are at least three cutting devices in a cutting state.
The knife pair 4 is in 1 exemplified as a rotating pair of circular knives, which includes an upper knife 15 and a lower knife 14. The two knives 14, 15 are each mounted on their own knife holder 11, 12 so that they can be rotated and/or driven. The knife holders 11, 12 are also connected to a slide 7, 8 in an adjustable manner. The knife holders 11, 12 enable the upper knife 15 to be moved out of a material web 3. The corresponding cutting device positioned at a “cutting position” S1 to S9 is transferred to a “waiting state” in a “cutting state”. The upper knife is usually moved out essentially orthogonally to the material web surface. The control device 21 controls the operating status 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 through the knife holders 11, 12; these can either be adjusted manually by the operator or controlled automatically by the adjusting device and the control unit.
With the carriages 7, 8 included in the lower and upper knife device 5, 6, the lower and upper knife devices 5, 6 are mounted in an adjustable manner on an assigned knife cross member 9, 10. The carriages 7, 8 can be controlled via at least one adjusting device 17, 18 via a control device 21 and can be adjusted transversely to the running direction L of the material web 3 in the material web width direction.
If the cutting device is in a “cutting state”, the cutting device is in engagement with the material web 3 and carries out a cut S, preferably a longitudinal cut S, in the material web 3.
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 carry out a cut S, preferably no longitudinal cut S, in the material web 3.
The edge edge trimming is advantageously carried out by the cutting devices 2.1, 2.5, which are included in the longitudinal cutting device 2 and are positioned at the edge and designed in such a way 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 unneeded edge strips 16 are fed via a removal device 24 to a pulper, pulper, shredding fan (not shown) or a suction device for recycling. The removal device 24 can include simple mechanical elements, which are designed as guide or guiding elements, and/or also include additional elements such as, for example, further edge strip suction.
1 also shows at least two guide rollers 25, over which the material web 3 is guided over the entire width before and after the longitudinal cutting device 2 and is supported at the same time. This enables an advantageous avoidance of possible vibrations of the running material web 3 in the area of the longitudinal cutting device 2. The material web 3 is usually pulled off from an upstream mother roll, not shown, and through the longitudinal cutting device 2, in which the material web 3 cut to create partial tracks I to VII. The partial webs are then wound onto a separate winding core or a 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 wrapping 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 usually lie next to one another in the transverse direction in a common theoretical winding axis, but it is also conceivable that the winding axes of the finished rolls are in different ones Positions in the running direction and/or in different height positions to each other.
Continues to show 1 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 and detachably connected to the upper knife device 6 and the lower knife device 5 for maintenance purposes. The coupling element 19 is designed in such a way that it is firmly and releasably connected to a sufficiently large, fixed area of the lower and upper knife device 5, 6, which is movable transversely to the running direction L, in order to achieve a stable attachment and coupling of the lower and upper knife device.
In other alternative embodiments, it is also conceivable, for example, to select components included in the lower and upper knife device 5, 6 as a fastening point, including the slides 7, 8 of the lower and upper knife device and / or also a fixed part of the knife holder 11, 12 to be used as a fastening point. Furthermore, an intermediate connection of the coupling element 19 with a guide element 20 would also be conceivable, which in turn are attached to the lower and upper knife devices 5, 6 at one of the points listed above.

An example of a coupling can be the following: carriage 8 of the upper knife device 6 on the coupling element 19, the coupling element 19 on the guide element 20, the guide element 20 on the knife holder 11 of the lower knife device 5.
The coupling produced is statically fixed 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 a fixed synchronization of the adjustment of both knife devices 5, 6. The coupling element 19 also enables the adjustment force required for the adjustment to be divided by the adjusting devices 17, 18. The adjustment of both knife devices 5, 6 can be carried out completely by one adjusting device 17, 18 or only be taken over proportionately. For example, only the adjusting device 17 of the lower knife device 5 adjusts the pair of knives 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 as a percentage, for example in half, with the adjusting device 18 of the upper knife device 6.
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.
Continues to show 1 For 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 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 edge strips 16 run between the first and second guide elements 20, 20b before the edge strip 16 is guided into the removal device 24.
In an exemplary embodiment, the second guide element 20b can be firmly and/or movably connected to the coupling element 19 and/or in another embodiment to the lower knife device 5 and the upper knife device 6, preferably with the carriages 7, 8. In 1 the first guide element 20 is firmly connected to the carriage 7 of the lower knife device 5 and the coupling element 19. The second guide element 20b is movably connected to the coupling element 19, in particular rotatably about the connection point of the coupling element 19 to the second guide element 20b.

2 shows a time sequence as from the material web 3 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 B _I to B _VII cut lengthways in the running direction L and one downstream winding, not shown, to be wound up into new finished rolls.
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 cutting device is at a standstill and the cutting device is disengaged or put into a waiting state.
Advantageously, the adjustment 23 becomes the edge Cutting devices 2.1, 2.5 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 that the edge cutting device is in the cutting state and cuts the material web 3. During acceleration, deceleration or production speed, the cutting devices are usually kept constant in their position and operating state.
The control unit 21 ensures that, depending on the operating state of the roll cutting machine 1, the cutting device 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 waiting state), which is understood to mean the respective one Cutting device 2.1 to 2.5 is 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.
In an alternative embodiment, a sensor integrated into the carriage 7, 8, in particular a magnetic sensor rod, reports back to the control unit 21 the respective position of the carriage, which can be used as an input signal for adjustment.
The cutting devices 2.1, 2.5 lead in the exemplary illustration 2 the edge edge trimming 16.1, 16.2, 16.3, 16.4 and are therefore referred to as edge cutting devices 2.1, 2.5.
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 produce 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 out the edge strips 16.1 and 16.2 at the same time as the cuts S1 and S5 the partial webs I and IV located on the edge or the material web 3. The edge strips 16.1 and 16.2 move on 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 representation of the 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 located in the same position within the roll cutting machine in relation to the running direction L of the material web. The edge strips 16.1 and 16.2 are guided into the removal device 24 via the at least one guide element 20 that is essential to the invention. The guide elements 20 are advantageously firmly 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 and enable reliable removal of the edge strip 16 into the removal device 24.
The coupling element 19, which is essential to the invention, connects the lower knife device 5 with the upper knife device 6 and thus enables an exactly synchronous adjustment 23 with an edge cutting device 2.1, 2.5 in engagement. An exact synchronous adjustment is particularly advantageous since a deviation of the two knife devices of just a few millimeters can lead to an interruption of the longitudinal cut and thus the edge strip is no longer discharged into the pulper. In a mild case, this usually leads to a further standstill of the slitting machine or, in a severe case, to a web break with further consequences.
After 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. This is done in 2 Shown by way of example is how the cutting device 2.3 produces a cut S3 in accordance with the prior art, is disengaged when the material web 3 is at a short standstill and the cutting device 2.3 undergoes an adjustment 23 transversely to the material web 3, here to the right, and engages again the material web 3 is set. When the movement of the material web 3 is resumed, the new cut S8 is now created after the format change 13, which now divides the new partial webs VI, VII from each other.
In this example, the cutting device 2.2 creates the cut S2 before the format change 13 and this is not adjusted during the format change. After the format change, the cutting device 2.2 creates the new cut S7 at the same position and divides the new partial webs V and VI.
The cutting device 2.4, which cuts the partial web III and IV in a first format before the format change 13, is in this example disengaged during the format change 13 or put into a waiting state. 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 of the 2 are shown in the context in the enlarged version, with more details 3 described.

3 shows an enlarged view of the corresponding edge edges 16.1, 16.2, 16.3, 16.4 2 in the event of a format change 13. The required time range and mate, which is advantageous in an alternative embodiment, are used rialbahn section before the format change is labeled 13.1 and the area after the format change is labeled 13.2.
In this example, the adjustment 23 of the edge cutting devices 2.1, 2.5 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, for easier explanation. 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 each other and continuously.
In 3 The edge strip 16.1 is divided from the partial web I with a cut S1 by the edge cutting device 2.1 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 transversely 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.
The edge strip 16.2 before the format change 13 is divided 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 transversely to the running direction L. The new edge strip 16.4 is divided 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 representation of the 3 For simplicity, the same distance 32 of the adjustment 23 of both edge cutting devices is assumed, but this distance can also expressly have different adjustment ranges for each edge cutting device. All edge strips 16.1 to 16.4 are advantageously guided into the removal device 24 via the at least one guide element 20 in the direction of the arrow.
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 in engagement and the included 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 transversely to the running direction L, in combination with the movement speed of the material web 3 in the running direction L, results 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 section line S1-S6 and/or S5-S9 to the running direction L.
In a possible alternative advantageous embodiment, the speed in the transverse direction of the adjustment 23 is set so 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. With this possible parameter of the adjustment angle 30, the correct adjustment speed in combination with the path speed can be determined by the control unit 21. The adjustment angle 30 corresponds to a speed of the adjustment 23 of the edge cutting devices 2.1, 2.5 transversely 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. 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 has been reached 13, carried out 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 and a short material web section 33 or transition material web section with a variable width is created. The material web section 33 is advantageously wound up with the first or inner material web layers of the new partial web V.
This has the advantage that the material web section 33 that is not actually being 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 using the transfer techniques usually used using an adhesive or traces of the transfer.
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 , carried out while the material web is still in motion. A format change 13 carried out in this way results in an area 13.1 in front of the format change on the material web and a material web section 34 or transition material web section with a variable width is created. The material web section 34 is advantageously with the last or outer material web layers of the old partial web IV.
This has the advantage that the material web section 34 that is not actually being used is also wound up with the last outer layers of an old, almost fully wound 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 scrap by the user of the finished roll.

4 shows a further alternative embodiment of at least one guide element 20, the guide element 20 being designed with perforations 40 in at least one area 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 divided edge strip 16 to be stabilized and reduces its tendency to flutter, especially at production speeds. This is caused 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 moving above the guide element 16, which can periodically tear off if there are no through openings.
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 amount of air flow, which has through openings 40 arranged in this area 42 than the area 41 remote from the cutting position in the transverse direction. Such a distribution of the through openings 40 has a particularly advantageous effect on smaller widths of the edge strip 16 and has an advantageous effect on the edge strip 16 Rotation of the pair of knives counteracts additional turbulence.
In a further alternative embodiment, 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, the second area 42 having at least a 50% higher flow rate of air per unit area, particularly preferably more than 25%. , as the second perforated area 41. Due to the increased turbulence after the edge cutting device 2.1, 2.5 seen in the running direction L, an increased air requirement is necessary in order to form a stable air boundary layer, as well as a smaller, higher resolution distribution of the through openings in order to safely remove even smaller edge strip widths. The through openings 40 can have different shapes, sizes and/or distributions, in particular circular, elliptical, oval, square, rectangular, rounded square and/or rounded rectangular 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.
The number and dimension, in particular diameter or passage area, of the through openings 40, the distances in the transverse direction 43 and the distances in the longitudinal direction 44 of the through openings are to be chosen so that a sufficient flow rate of air occurs in the air boundary layer. The distances 43 and 44 are in 4a as an enlarged section of the perforated area 4 shown.
The holes can be arranged in a row, 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 in order to achieve a more even distribution of air.
In a further alternative embodiment, the guide element 20 with through openings 40 is connected to a fan and the through openings 40 are actively supplied with a controllable air flow and thus form an actively controllable air boundary layer.

Reference symbol list

1

Roll cutting machine

2

Longitudinal cutting device

2.1, 2.2, 2.3, 2.4, 2.5

cutting device

3

material web

4

Pair of knives

5

Bottom knife device

6

Upper knife device

7, 8

Sleds

9, 10

Knife traverse

11, 12

Knife holder

13

Format change time or position

13.1

Area before the format change

13.2

Area after the format change

14

Knife (upper knife, plunging knife)

15

Knives (bottom knife, counter knife, pot knife)

16

Edge strips

16.1, 16.2

Edge strip before the format change, first format

16.3, 16.4

Edge strip after format change, second format

17, 18

Adjusting device

19

Coupling element

20

Leadership element

20b

Second guide element, guide baffle

21

Control unit

22

imaginary common cutting plane

23

Adjustment direction of the cutting devices (arrow)

24

discharge device

25

guide roller

30

Adjustment angle

31

Format change area in the running direction of the material web

32

Format change area across the material web

33

Material web section on inner layers

34

Material web section on outer layers

40

Passage opening

41

Area with fewer through openings per area

42

Area with more openings per area

43

Distance between the through openings in the transverse direction

44

Distance between the through openings in the longitudinal direction

BI,BII,BIII,BIV,BV,BVI,BVII

Width of the individual lanes

L

Running direction (arrow)

I, II, III, IV

Partial web before format change

V, VI, VII

Partial web after format change

S

Section, longitudinal section

S1, S2, S3, S4, S5

Cutting line, cutting position before the format change

S6, S7, S8, S9

Cutting line, cutting position after the format change

QUOTES INCLUDED IN THE DESCRIPTION

This list of documents listed by the applicant was generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• DE 29812753 U1 [0006]
• DE 3419843 C2 [0008]
• EP 1313597 A1 [0011]

Claims (15)

Method for longitudinally cutting and winding a running material web (3), in particular a paper or cardboard web, in a roll cutting machine (1) into several finished rolls formed from individual material web layers, by means of a longitudinal cutting device (2), which has at least three cutting devices (2.1, 2.2, 2.3, 2.4, 2.5), and which each comprise a pair of knives (4) with a lower knife device (5) and an upper knife device (6), and wherein the at least three cutting devices in the running material web (3) each make a longitudinal cut (S) in one 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) transversely 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 is, 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 at least one edge strip (16, 16.1, 16.2, 16.3, 16.4) cuts off, and wherein the at least one edge strip (16, 16.1, 16.2, 16.3, 16.4) is guided into at least one removal device (24), characterized in that the at least three cutting devices (2.1, 2.2, 2.3, 2.4, 2.5) in one imaginary, common plane (22) cut the material web (3), 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. Procedure according to Claim 1 , characterized in that the at least one edge cutting device (2.1, 2.5) continuously remains in the cutting state during the adjustment (23) from the first cutting position (S1, S5) to the second cutting position (S6, S9). Procedure according to Claim 1 or 2 , characterized in that the adjustment (23) of the at least one edge cutting devices (2.1, 2.5) at a speed of the material web (3) greater than 10 m/min, in particular greater than 40 m/min, particularly preferably greater than 80 m/min , he follows. Method according to one of the preceding claims, characterized in that a speed of adjustment (23) of the at least one 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%, the speed of the material web (3) is controlled. 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), after the format change (13.2) has been reached. Method according to one of the preceding claims, characterized in that the adjustment of the at least one edge cutting devices (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), before the format change (13.1) is reached. Procedure according to Claim 5 , characterized in that a variable-width material web section (33) created after the format change (13) is wound up with the first or inner material web layers of a new finished roll of a corresponding partial web (V). Procedure according to Claim 6 , characterized in that a material web section (34) of variable width created before the format change (13) is wound up with the last or outer material web layers of an almost finished roll of the corresponding partial web (IV). Longitudinal cutting device (2) for cutting a running material web (3), in particular a paper or cardboard web, in a roll cutting 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), each of which comprises a pair of knives (4), and each pair of knives (4) comprises a lower knife device (5) supporting the material web (3) and an upper knife device (6) immersed in the material web (3), and all lower knife devices ( 5) on a common knife beam (9) and all upper knife devices (6) on another common knife beam (10) are mounted so that they can be adjusted transversely to the running direction L, and each upper knife device (6) can be connected to an adjusting device (18) and each lower knife device ( 5) can be connected to an adjusting device (17), and two cutting devices as Edge cutting devices (2.1, 2.5) are designed 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 upper knife device (6). and the lower knife device (5), 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). Longitudinal cutting device (2). Claim 9 , characterized in that the at least one mechanical guide element (20) can be connected firmly or rigidly, in particular a mechanical coupling rod, to the lower knife device (5), the upper knife device (6) and / or the coupling element (19), such that synchronization the upper knife device (6) and the lower knife device (5) and an adjustment transversely to the running direction (L) is made possible. Longitudinal cutting device (2). Claim 9 or 10 , characterized in that the adjusting device (18) of all upper knife devices (6) is designed as a single rotating belt drive (18), which enables adjustment on the common knife cross member (10) of the upper knife devices and the adjusting device (17) of all lower knife devices (5) is designed as a single rotating belt drive (17), which enables adjustment on the common knife crossbar (9) of the lower knife devices. 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) . 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 between the edge strips (16.1, 16.2, 16.3, 16.4) and the perforated area of the guide element (20) can form a stable air boundary layer. 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 region (41) and a second perforated region (42) with through openings (40), the second region (42 ) is designed such that at least a 50% higher flow rate of air 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), the second guide element (20b) acting as a guide guide plate (20b). is carried out and is designed such that the edge strip (16.1, 16.2, 16.3, 16.4) can be guided between the two guide elements (20, 20b).

Images