DE102012200852A1 - Upper blade holder for blade assembly for roller winding cutting device for longitudinal cutting of paper web, has engaging device designed and arranged such that upper blade is moved in sections along distances in superimposed manner - Google Patents

Abstract

The holder (1) has an engaging device (8) moving an upper blade (4) along a vertical z-direction and a horizontal y-direction at distance against a lower blade (9) and bringing the upper blade from a resting position into a cutting position. The engaging device is designed and arranged such that the upper blade is moved in sections along vertical and horizontal distances in a circular arc shape and an ellipse arcuate shape in a superimposed manner. The upper blade is pivoted from the resting position into the cutting position at a main axle (5). An independent claim is also included for a method for longitudinal cutting of a continuous material web.

Description

The invention relates to a knife holder for an upper knife for a knife assembly for a device for longitudinal cutting of a running material web, wherein the knife assembly to each other assignable upper blade and lower blade, and wherein the upper blade movable by means of a Anstellinrichtung along a vertical and a horizontal path against the lower blade and a rest position in a cutting position can be brought.

The invention further relates to a device for longitudinal cutting of a running material web.

Finally, the invention also relates to a method for longitudinal cutting of a running material web.

The invention will be described below with reference to a paper web as an example of a material web. However, it is also applicable to other webs that can be handled in a similar manner. As an example of a winding device is used in the sequence of a slitter, in particular a back-up roll slitter, to which the invention is particularly advantageously applicable.

In order to make the production process of paper production as efficient as possible, efforts are being made to produce paper webs as wide as possible at the highest possible speed.

The resulting paper webs are wound up for further processing or transport on empty reeds and then often called full reels or mother rolls, which currently usually reach lengths of up to 10.5 m, diameter of over 4 m and weights of up to 170 tons. For some finishing processes, but especially for transport outside the home, such large and heavy rolls are too unwieldy and consequently have to be cut in the longitudinal direction of the paper web and then rewound onto narrower rolls, so-called partial web rolls or finished rolls. Such a partial or finished roller is then between 0.2 m and 4.3 m wide and usually has a diameter in the range of 0.8 m to 1.8 m.

This task is usually accomplished by so-called slitter-cutting machines, which essentially consist of a unwinding device, a cutting section and a roll-up device, wherein the cutting section has a number of disk-shaped cutters adapted to the possible pitches.

In the cutting section of a slitter reel, several such knife holders are axially adjustable on a knife bar above the associated lower knives. As an example of the prior art from the German Patent 1024341 As is known, to change the cutting width program, the upper knives are first axially pressed off the lower knives, and then raised. After adjusting the new cutting widths on the cutter bar, the upper blades are first lowered and then turned back axially, against the previously set at appropriate intervals associated lower blade. Thus, there are two successive linear movements guided around different guides.

A knife holder with the aforementioned features is in the DE 41 14059 A1 described; the cutter head carrying the circular knife sits at the end of a lowering piston rod, by means of which the circular blade can be lowered into or raised from its cutting plane. The arranged in the cutter head adjusting device ensures an adjustment of the circular blade transverse to the axis of the lowering piston rod to rest on a lower blade or lifts the circular blade outside the cutting process of the lower blade.

In order to carry out these movements, the adjusting device has an actuating piston which can be actuated in the direction of the cutting position of the circular blade, while a compression piston acting on the adjusting rod provides for the return of the circular blade out of the cutting position, which biases the adjusting piston rod into the ready position of the circular blade.

Thus, over the effect of the preloaded compression spring overcoming, applied by the compressed air applied to the Anstellkolbens pressure force in the direction of the cutting position of the circular blade and the prevailing between the circular blade and an associated lower blade cutting force predetermined or adjustable.

With such a design of a knife holder now has the disadvantage that the aforementioned type of cutting force control due to the compression springs used to own tolerances and non-constant spring characteristics in their accuracy is not sufficient; are used as part of a cutting machine, a plurality of such blade holder, so means each set equal to the blade holder and its Anstellkolben air drive pressure not equal cutting force, because in function of the respectively assumed stroke position of the circular blade and the Anstellkolbenstange and depending on spring tolerances and spring characteristic the associated compression spring counteracts the force acting in the direction of the cutting position of the circular blade air drive pressure a different sized spring force.

From the DE 2657792 A1 a knife holder is known in which waiving a provision of the provision of the Anstellkolbenstange in the hold position causing compressive spring, the movement of the Anstellkolbenstange both in the cutting position and in the ready holding position via Druckluftbeaufschlagung. However, such a design is complicated because of the regulation of the required in both directions of compressed air drive.

A knife assembly with the generic features is in a equipped with individual knife holders slitter from the DE 297 12 149 U1 known. In the knife holder known therefrom, the lowering device consists of two parallel guided in a holder housing guide rods, is attached to the lower, free end of the cutter head and the upper ends are connected to a common piston, with a suitable medium, preferably compressed air, for carrying out the Lowering movement of the cutter head can be acted upon. In this knife holder, the depth adjustment consists of a threaded sleeve disposed between the guide rods, which is adjustable by means of an out of the holder housing adjusting threaded spindle in position. The piston is fixedly connected to a stop element, which sits on the set as a counter-stop threaded sleeve during the lowering movement of the piston, whereby a determination of the cutting position of the circular blade is formed in its overlap with the associated lower blade of the slitter.

With the use of a longitudinal cutting machine, it has proven to be extremely important in terms of reproducible compliance with the cutting conditions, to set an exact overlap between the held on the knife holder circular blade and the associated lower blade. Here, in the known knife holder, the stepless adjustment of the depth stop on the adjusting threaded spindle disadvantageous because often the accuracy of the depth adjustment by the operators is not given the required attention and certain adjustments during operation are not completely ruled out.

The invention is therefore based on the object of simplifying the longitudinal cutting of material webs and the necessary equipment at least in places the task.

The object is achieved by a knife holder according to the preamble of claim 1, characterized in that the adjusting device is designed and arranged such that the upper blade at least partially overlaid along the vertical and horizontal paths to be overcome is movable.

In this way, the adjusting movement and the associated control of the upper blade is considerably simplified. In addition, the total path is shorter by the overlay.

Due to the at least partially overlapping the vertical and horizontal distances to be overcome, the basic prerequisite is created to move the upper blade by means of a single drive in the cutting position. In this way, considerable costs for the otherwise always necessary second drive or a complex reversing gear for implementing a respective separate movement can then be saved in two mutually perpendicular directions of movement. This also reduces the maintenance and repair costs. Also reduces the parts list in the production, so that can be produced more efficiently. Irrespective of this, however, the space requirement also drops. If several knife arrangements are to be positioned side by side over a movable, colloquially so-called material web, they can be placed closer together. This means that the producible minimum web width of the material web to be cut drops, as a result of which expensive post-processing processes can also be saved.

Since, in addition to the space required, the weight of a single knife assembly is reduced by providing a knife holder according to the invention, the component carrying it can also be called the knife holder traverse and along which the knife holders can be positioned in the Y direction over the material web within a device for longitudinal cutting , can be performed in "lighter" design, or can accommodate more individual knife holder or knife assemblies with the same sizing.

If the upper blade is moved from the rest position to the cutting position by means of only a single drive, the number of degrees of freedom that becomes effective in the cutting position decreases. Although these degrees of freedom are locked in operation by locking, but always subject to a certain "game". The locking forces acting on them must be precisely adjusted and coordinated. It is difficult, however, that a moving web of material next to its actual movement (in the X direction) also " Flapping movements "and even the movement in the direction of travel (X-direction) is subject to irregularities due to pull fluctuations. These secondary movements are chaotic - so they are unpredictable in intensity, intensity and direction.

Depending on the movement, they load the locking forces opposing the respective degree of freedom, which ultimately leads to fluctuations in the cutting force, even if the cutting edge of the upper blade does not move - or does not move visibly.

By standing in connection with the provision of a knife holder according to the invention reduction of the number of degrees of freedom so a homogenization of the cutting force is achieved. This results in less dust and the risk of a web break is drastically reduced. Also, the cutting edge of the generated part track looks cleaner, which significantly increases the saleability of the product produced.

It is advantageous if the upper blade is movable along the paths to be overcome.

In a smooth movement, without jump or heel, the Anstellzeit is significantly shortened and the wear in and on the Anstelleinrichtung is minimized. Thus, the time of use of the slitter can be controlled more accurately. The reduced wear results in fewer production losses.

It is particularly advantageous if the upper blade in a smooth shape, preferably at least in sections in a circular arc or elliptical arc shape along the paths to be overcome movable, in particular is feasible.

This makes the movement particularly smooth and even. Also, the required drive power is reduced. Experiments have shown that very good cross-sectional images are also generated directly in the region of the beginning of cutting by this harmonic adjusting movement.

Preferably, the knife holder has an axis about which the upper knife is pivotable from the rest position to the cutting position.

The fact that the upper blade is movable from the rest position to the cutting position in a continuous pivoting movement, the longitudinal cutting of webs and the necessary equipment will greatly simplify. The structure of the knife holder can be reduced in such an embodiment of the invention to particularly few parts compared to the prior art. Such a knife holder is correspondingly robust. Of particular advantage is also the low control or standard effort, since, for example, a simple linear movement, a drive sufficient to safely, clean, trouble-free and repeatable from its rest position to its cutting position to the upper blade, by a single pivoting movement about a defined axis spend or in the reverse direction to move the upper blade from the cutting position back to the rest position.

The knife holder and knife arrangement become particularly simple and robust when the axis is cylindrical.

The depth adjustment then takes place, for example, by displacement of the entire knife holder in the Z direction. For this purpose, a spindle drive can be provided. If material webs with substantially the same properties and basis weights are always cut in the apparatus for longitudinal cutting, it can certainly be advantageous if the depth adjustment is made simply by one or more spacers between knife holder and machine connection, in particular thus a knife carrier traverse, for cost reasons.

However, the axis can also have at least one eccentric region, in particular in a cam shape.

With suitable alignment, an automatic depth adjustment is possible.

Since the peripheral speed during pivoting about an eccentric also changes, the speed with which the upper blade penetrates the material web on its way from the rest position into the cutting position can be determined by shaping and alignment of the eccentric region.

Especially advantageous, but also a little more elaborate and expensive, it is natural, if the eccentric range is adjustable.

Thus, the knife holder can also meet different requirements by different material web properties and speeds.

In other cases, it may be advantageous if the knife holder has a linear guide, which is inclined relative to the material web, that they between the rest position and cutting position to be overcome portions of the top knife, in the vertical (Z) and in horizontal (Y- ) Direction overcast.

Along an inclined grade, the distance to be bridged from a rest position to a cutting position must be overcome over the shortest possible distance.

The angle of inclination with respect to the horizontal, ie also with respect to the upper side of the moving material web, can then be determined constructively according to the desired incision angle, which depends in particular on the properties and the speed of the material web to be cut, or can be variably adjusted in predetermined angular ranges. If material webs with very different properties are to be cut, it can be of considerable advantage if an angle adjustment device which can be adjusted during operation is provided. Under material webs with very different properties, for example, paper webs with strong differences in basis weight, for example from 42 g / m ² to over 80 g / m ² or 100 g / m ² to 160 g / m ² to understand.

Preferably, the knife holder comprises a movable guard, which is movable from a provision in a protective position in which it prevents contact between the upper blade and the material web.

The protection can thus be brought between the upper blade and the material web when the upper blade is outside the cutting position, preferably in the region of the rest position. It is also conceivable that the protection laterally flanks the upper blade in such a way that it prevents contact between upper blade and material web.

This makes it possible to provide the rest position of the upper blade in a close settled on the material web to be cut area, whereby the Anstellweg of rest position in the cutting position is very small. This has the particular advantage that the time required becomes very short, even if the upper blade is not moved as fast as usual. A control / regulation can therefore be very accurate. In addition, the resulting travel forces are kept small and thus reduces the wear.

Preferably, the lower vertex of the upper blade formed as a circular blade is then only less than 15 mm away from the surface of the moving paper web. However, an edge provided with effective protection of an upper knife can even be brought up to about 3 mm ... 6 mm to the surface of the moving material web.

Then even electromagnets can be provided as actuators - so that both the Anstellzeit as well as the risk of a web break are minimized.

It is particularly preferred that the protection is in operative connection with the adjusting device such that it is automatically moved into a provision when the upper blade is moved from the rest position into the cutting position.

This always ensures that not the protection itself is rammed into the material web or - depending on the design of the protection - the upper blade bounces against the protection. The former could be the case, for example, if the protection is arranged parallel to the disk-shaped upper blade and prevents flanking contact between the vertex of the circular blade and the moving material web by lateral flanking. The latter could be the case, for example, if the protection is arranged parallel to the surface of the material web to be protected and is movable between the vertex of the circular blade and the surface of the material web.

In addition, it may be preferred that the upper blade can be brought from the rest position into the cutting position by means of a single drive, wherein the adjustment of the cutting force by the same drive is vornehmbar.

The entire construction is thereby further simplified and thus both cheaper and more robust. Next it is again "easier", which brings the follow-up benefits already described above.

Of particular advantage, however, is that the cutting force depends only on the force / pressure of a drive and thus is absolutely precisely controlled. In this way, first-class cutting results are to be expected. Since the cutting force automatically adjusts according to the wear of the cutting edge of the upper blade while maintaining constant the Anstellkraft or Anstelldrucks, these results are achieved without maintenance practically over the entire useful life of a cutting edge or an upper blade.

Advantageously, a stop is provided for setting a, between upper and lower blade trainees, cutting angle by which the movement of the upper blade in the cutting position can be limited.

Since a stop forms a definable limit, so can easily repeatable positioning and Cutting angle adjustment of the upper blade to the lower blade are guaranteed. Favorable cutting angles are associated with the processing of tissue, paper or cardboard webs in the range between 0.2 ° and 2 °, usually around 0.5 °.

The stop can be elegantly integrated in the pivoting or sliding mechanism of the adjusting device. In the vast majority of cases, a fixed edge or surface will be sufficient, which works absolutely maintenance-free and trouble-free and is also extremely inexpensive to manufacture.

In some cases, it may also be required that the stop is adjustable to perform.

In order to prevent unnecessary wear of the adjusting device and the cutting edge of the upper blade, as well as its storage, it may also be useful to incorporate a damping mechanism in the stop. This can be a rubber or polymer plate in the simplest case. In other cases, however, such a damping device may also comprise a small spring or a small hydraulic or pneumatic cylinder. The effective damping force must then be included in the calculation of the cutting force generating size. For this purpose, the damping device and the size generating the cutting force may expediently be coupled to a common pressure system.

With particular advantage, the adjusting device is designed and arranged such that it is suitable next to a first movement path along which the upper blade from the rest position can be brought into the cutting position form a second movement path, which differs at least partially from the first movement path and along which the upper blade can be brought from the cutting position to the rest position.

Motion path refers to upper blade. For a specific response he should refer to the cutting area in the narrower sense and to the point of view of the theoretical point of view at the tip of the upper knife.

Particularly preferred is that the first and the second movement path each form part of a closed movement path.

In fact, it may be advantageous for the upper knife to be inserted into the material web with the interposition of vertical and horizontal path portions in order, inter alia, to minimize the risk of a web break, but to pull it out of the material web in essentially vertical motion, precisely for the same reason, namely to minimize the risk of web breaks.

• – Pneumatikzylinder
• – Hydraulikzylinder
• – Zahnrad
• – Zahnstange
• – Kniegelenk
• – Seilzug
• – Linearmotor
• – Linearführung
• – Keilmechanismus
• – Magnet, insbesondere Elektromagnet

Advantageously, the drive comprises at least one of the following components:

• - Pneumatic cylinder
• - Hydraulic cylinder
• - gear
• - rack
• - Knee joint
• - cable
• - Linear motor
• - Linear guide
• - wedge mechanism
• - Magnet, in particular electromagnet

In a device according to the preamble of claim 12, the object of the invention is achieved in that the device comprises at least one knife holder according to one of claims 1 to 11.

The advantages of such a device will become apparent from the description of advantages of the knife holder according to the invention and its preferred embodiments, as well as from the following description of the embodiments in conjunction with the illustrated figures.

In a method according to the preamble of claim 13, the object of the invention is achieved in that for longitudinal cutting of the material web, a knife assembly is used which comprises a knife holder according to one of claims 1 to 11.

Again, there are already significant advantages of such a method of the advantage descriptions of the knife holder according to the invention and its preferred embodiments, as well as from the following description of the embodiments in conjunction with the illustrated figures.

It should be noted, however, that such a method is to be used particularly advantageously if the material web is cut longitudinally prior to winding, and in particular between a winding and a winding.

From a winding area, in practice, there are always unpredictable demands on its surroundings.

In the case of a trough-shaped or lid-like formation of a cross section through the running material web, it may be necessary, for example, to provide a trim edge before web width winding. Similarly, a trim may be necessary if the web width to be generated Winder - so the mother role - to be brought to a certain axial dimension for a post-processing.

In so-called roll winding devices, ie in devices which have a take-off and a take-up area, partial webs or finished rolls should generally be produced when the cutting section is provided, the added width, together with the losses from the cutting widths and a possible edge trim, again the original width der Mutterrolle.

The required pattern changes here due to the customer's wishes mostly from role to roll design, so that in connection with the resulting improvements in the quality of cutting control or controllability and reduced wear, as well as the minimization of the risk of web breaks the advantages of the invention particularly good use. Since a large number of knife arrangements, for example between 10 and 40, are usually also provided in a roll winding device or a roll cutting winding device, the achievable cost advantages are also particularly pronounced here.

With particular advantage, the upper blade is moved from the rest position into the cutting position through an already running material web.

This makes it possible to keep the loss of production as low as possible. Although then a certain proportion of running meters of material web uncut again the recovery (usually a so-called pulper) are supplied. However, since start-stop times and the directly associated with stopping and restarting the machine loads or signs of wear are prevented, the effectiveness of such a developed process increases significantly.

The invention will be explained in more detail below with reference to exemplary embodiments with reference to the drawing. In this show:

1a to 6b Various preferred embodiments of knife holders, in which an upper blade from a rest position (part b of each figure) in a cutting position (part a of the respective figure) is pivotable.

7 : Example of a drive, through which both the adjusting movement, as well as the cutting force regulation are regulated.

8th : Detail view of the material web penetration by means of overlaid vertical and horizontal travel portions of the upper knife

9a and 9b : An embodiment of a knife holder, in which an upper blade from a rest position (part b of each figure) in a cutting position (part a of the respective figure) along a linear, inclined to the surface of the material web, guide is movable.

10 : Detail view of a protection device

11 : Detail view of a second protection device

12 : An exemplary roll wrap cutter

In the 1a to 6b Various preferred embodiments of knife holders are shown in a highly schematic manner, in which an upper blade from a rest position RP (part b of each figure) in a cutting position SP (part a of the respective figure) is pivotable. Where not explicitly stated, the same parts have the same reference numerals in the figures. The knife holder 1 comprise a housing or body 2 the upper side in a manner not shown, for example, on a knife holder traverse or simply cross-beam of a roll winding cutter 31 , (as they are in 12 exemplified in schematic form) is stored. In general, the knife holder 1 so stored on the crossbeam that he can position in the Y direction over the produced or to be processed material web M and releasably fix. Such positioning operations are generally carried out automatically today. The pictured knife holder 1 have appropriate mechanisms, which are known to the skilled person and have not been shown here for reasons of clarity. In a lower area of the body 2 is a knife holder 3 provided, on which the actual upper knife 4 changeable fixable, so it is mountable. The knife holder 3 includes next to an axis 5 To the trained as a circular knife upper blade 5 is rotatable, a support device 6 and a locking or locking device 7 , The knife holder 3 is in common with the upper knife worn by her 4 by means of an adjusting device 8th against the lower knife 9 unemployable. The terms upper blade and lower blade should, as already mentioned, also be valid for the purposes of this document if the upper blade is arranged on the underside with respect to the material web M to be processed, or if the material web M not horizontally but along a slope or even perpendicular runs, though she through the knife assembly 10 is cut longitudinally and upper and lower blades are each side opposite.

The hiring facility 8th comprises in the first preferred embodiment according to the 1a and 1b now a joint 11 to that the knife holder 3 opposite the main body 2 is arranged pivotably in a preferably defined angular range. It is advantageous if the joint 11 one or two stops 12 has, by the pivoting movement is one or both sides limited. The pivoting movement in this embodiment can be initiated by a drive 13 , which is designed as a small pneumatic cylinder and, if necessary, would be replaced by a hydraulic cylinder. However, one would like to prevent the provision of hydraulic units above the material web M, because leaks in the hydraulic system over the period of use can never be completely avoided and then there is a risk that hydraulic fluid drips or flows on the web M and thereby damaging the material web M or even unusable , The drive (pneumatic cylinder) 13 is formed in the illustrated case so that it in addition to the adjusting movement of the upper blade 4 also regulates its cutting force. For this purpose, the pressure in the cylinder is continuously monitored and regulated by a control device R exactly.

Alternatively to the stop described above 12 in the joint 11 It may therefore be useful in connection with an undisturbed cutting force control, the stop function in the pneumatic cylinder 13 integrate trained drive.

In 1b is the upper knife 4 in the rest position RP and is swung out by an angle of about 30 ° from the cutting position. In a conventional circular blade diameter of about 200 mm and a pivoting movement about a joint 11 whose midline is the midline of the major axis 5 then results in approximately a vertical distance h of approximately 25 mm between the blade of the upper blade and the material web when the blade 4a the material web M in the cutting position SP has penetrated by a few tenths to a few millimeters. Such a distance closes an unwanted contact of the moving material web M with the blade 4a of the upper knife 4 sure out. The angle can also differ from the mentioned 30 °, as long as a given security is guaranteed and the blade in its upper area not with the housing 2 collided.

The embodiment of the 2a and 2 B is different from the one in the 1 illustrated embodiment in that the adjusting 8th is not provided laterally of the body, but is attached to the 45 ° to the horizontal inclined bottom. The drive here is an electric motor 14 provided, whose output shaft directly as a joint 11 serves or with which the joint 11 is connected via a suitable gearbox. As can be seen from the pictures, the case can 2 be significantly stronger in this embodiment and also withstand the cutting loads of massive material webs M. Also offers the case 2 enough space to accommodate various facilities. However, the space requirement is also greater in this embodiment. In rest position, the space requirement in the Y direction of such a construction by about 20% to 25% greater than after the 1 , which limits the minimum section width.

Related to the in the 2a and 2 B illustrated embodiment, the embodiment differs 3a and 3b in that the joint 11 with an eccentric 11a communicates, via an adjustment 11b in the circumferential direction around the joint 11 is adjustably arranged, wherein the adjusting device 11b can be omitted if over the period of use of Messeranornung always similar webs, so for example, paper webs with only a small basis weight spectrum, for example, from 70 g / m ² to 80 g / m ^{2 to be} cut.

The peripheral surface 11c of the eccentric 11a may, for example, directly on the inclined underside of the body 2 roll off. Advantageous in a design with an eccentric 11a it is that the path components and / or the movement speed at the blade 4a Change within the pivoting process and automatically generate a particularly high pivoting speed and a particularly powerful puncture, for example, under normal Anschwenkbedingungen.

Again referred to in the 1 illustrated embodiment, the embodiment differs according to the 4a and 4b in that the adjusting device 8th instead of or in addition to the pneumatic cylinder 13 a knee joint mechanism 15 has, which can translate the forces to be transmitted in a suitable manner and in at least one of the two end positions (SP, RP) is automatically locked. Such a knee joint mechanism 15 can also do without pneumatic or for example, simply work against a spring force. Advantageous to such a purely mechanical adjusting device 8th or on one, with a mechanical locking (here dead center of the knee joint) provided adjusting 8th is that, for example, in case of failure of a system pressure, the upper blade 4 remains in its intended position. An unintentional "collapse" of the upper knife 4 in the material web M due to gravity is thus safe to exclude.

Again referred to in the 1 illustrated embodiment, the embodiment differs according to the 5a and 5b in that the drive as a rotary actuator 16 is formed, which offers high power reserves and also for the strongest cardboard tracks or even reinforced paper or cardboard tracks is permanently suitable. The semi-rotary drive has a damped stop on both sides, so that the angular range between the rest position RP and the cutting position is precisely defined on the one hand, but also intercepted by the integrated damping on the other. At the same time, the drive needs 16 Not even before reaching the final cutting position SP reduce the pitch, which is a clean penetration of the material to be cut very good and also reduces the positioning time. The fact that even the upper stop, that is the stop against the knife holder 3 is supported in the rest position RP, is damped, it comes also not to wear when an upper blade of a knife assembly is not in use is exposed to vibrations that are transmitted, for example, from the cross member, not shown, but explained above. A loose shaking the locking or locking device 7 or other parts and resulting hazards are effectively prevented. A rotary actuator is also particularly precisely regulated and provided here as a common drive for the adjusting movement and for regulating the cutting force.

Again referred to in the 1 illustrated embodiment, the embodiment differs according to the 6a and 6b in that an unillustrated drive by a, against a tension spring 17b working, cable 17a takes effect. So here the simplest means are used, which emphasize above all the possible price advantages of a knife holder according to the invention. However, such a design is only suitable for rather less demanding material webs.

In contrast, the in 7 Pictured knife holder 1 again a high-quality solution with the drive shown.

Here is a rack 18 in a linear guide, preferably a dovetail 19 movably mounted without play. The linear guide is with the main body 2 firmly connected or formed directly from this. The rack is at its upper end with the piston rod of a pneumatic cylinder 20 connected, which serves as a common drive for the adjusting movement and the cutting force control and its operating pressure by a sensor 21 is constantly monitored and so from a control device R is constantly controlled exactly.

Also firmly connect to the main body is an axis 22 to get a gear 23 is rotatably arranged so that the upper blade is at least partially, here even completely superimposed on the basis of the circular shape of the gear along the vertical and horizontal distances to be overcome movable. The gear 23 is now again with a major axis 5 connected to a knife holder 3 rotatably mounted and in an upper knife 4 through a closure device 7 is securely fixed. The upper knife 4 is frictionally locked in the area of its blade 4a through the bottom knife 9 driven, so it rotates about the main axis 5 only in the cutting position SP. That means the blade 4a when entering the material web M not yet around the main axis 5 rotates. Where not stated otherwise, this principle also applies to the other illustrated embodiments.

8th now shows a detailed view of the web penetration by superimposed vertical (Z-direction) and horizontal (Y-direction) Weganteilen the upper blade 4 along a circular path shown in dashed lines. In the lower right corner is a section of the lower knife 9 shown that is generally already driven at high speed when the upper blade reaches its cutting position SP.

It can be seen that the material web M is very close to the lower blade 9 is penetrated. Roughly speaking, the puncture distance in the Y direction is approximately equal to the amount of the overlap or depth of cut set and is usually in the range of only 2 mm to 3 mm. At such a small distance, the material web M, for example, a paper web through the top 9a of the lower knife 9 safely supported. This will make a clean cut possible. The web also undergoes only a minimal stretch because it does not have to escape down until an excess of force on the blade is reached. Consequently, the fibers of a paper web in the vicinity of the groove are not torn open as usual. The risk of a web break is so already already minimized.

In addition, the material web during the puncture by the superposition of Weganteile already in a kind of squeezing movement against the side surface (work surface) 9b led the lower knife. This process is continuous, that the circular blade is circular in section.

Attempts have also confirmed that a clean cut is still possible when the blade 4a of the upper knife 4 is already classified as worn or at least largely worn by customary standards. This will increase the useful life of an upper knife 4 significantly extended, which significantly reduces operating costs over one year. In fact, it is the case that the upper knives are usually changed only in time because they are no longer sharp enough to produce a clean puncture without the risk of a web break.

In both 9a and 9b is now an embodiment of a knife holder 1 represented in which an upper knife 4 from a - shown here exceptionally in part a of the figure - rest position RP in a cutting position SP (here part b of the figure) along a linear, inclined to the surface of the material web M, guide 24 is movable.

The knife holder 3 is with a guide body 25 connected. The guide body 25 is free of play sliding in the lead 24 movable, taking the lead 24 Part of the housing 2 is, or is related to. The angle of inclination α in the two figures is about 68 ° and is thus theoretically particularly well suited to a conventional blade angle of a conventional circular blade for papermaking or paper processing 4 Voted. In addition, the circular blade pierces at an angle of well above 45 °, for example, of over 60 °, the material web very clean. Regardless, however, other, possibly very different angles are quite possible. Surprisingly, it can namely be suitable for very soft material webs, such as fine tissue, to provide a rather flat angle of inclination of about 27 ° to 35 °.

In the environment of the leadership 24 In the illustrated preferred embodiment, electromagnets are shown 26 and 27 above and below the guide body 25 arranged. By alternating switching of the guide body jumps 25 between the two electromagnets 26 . 27 back and forth. At the same time the upper knife reaches 4 at investment of the guide body 25 at the upper electromagnet 26 its rest position and when the guide body 25 at the bottom electromagnet 27 its cutting position. The two electromagnets 26 . 27 At the same time, they serve as a travel limit or stop and can do so in their position within the housing 2 also be adjustable or even electronically adjustable.

In a practical embodiment, the lower electromagnet 27 designed such that it by applying different voltage variable tensile forces on the guide body 25 can exert, so the cutting force of the upper knife 4 can be resolved very finely resolved.

In the 9 and 10 now protective devices are shown which prevent inadvertent contact between the blade 4a of the upper knife 4 and the material web M effectively prevent. Both figures are executed as non-scale and schematized detail views in order to focus on the essentials.

In 10 is the protection 28 designed as a rubber or plastic plate, which is parallel to the face of the upper knife 4 is aligned. The protection 28 is in the case 2 stored that during the movement of the upper knife 4 from its rest position RP in its cutting position SP remains at rest. That's why the protection needs 28 not be associated with a special movement mechanism, which is a rapid shift of protection 28 could accomplish. In the case shown is only a device for height adjustment 29 provided, but for cost reasons in somewhat simpler cases could well be waived. The device for height adjustment 29 however allows exact positioning of the protection 28 and a possible adjustment in case of possible wear. The protection 28 is now so stored and trained that the blade 4a of the upper knife 4 the work surface 9a of the lower blade by a movement from the rest position RP in the cutting position SP along the dashed line can reach unhindered. In contrast, the bottom is 28a of protection 28 a few millimeters wide and also has a certain extent, which extends in the image plane (ie in the X direction). The area of the bottom 28a In any case, it is dimensioned so that it even with sudden contact between web M and protection 28 can not come to a damage of the material web M. If appropriate, the protection may also be resiliently mounted, wherein the spring travel must of course be less than the coverage height with which the protection 28 the blade 4a towers over. Furthermore, the edges of the bottom can also be used 28a be broken or rounded.

A very simple embodiment of a protection is that the bottom of the case 2 itself serves as protection, but then expediently forms a kind of sliding surface and / or is covered with a protective cover.

In 11 is a protection 28 shown with a hitch 30 is in operative connection, so that it is automatically from a protective position SSt in a provision BSt, preferably positively controlled, movable when the upper blade 4 is moved from the rest position RP in the cutting position SP. The forced control can be realized via a Getriebekulisse so a molded sliding surface.

12 finally shows an exemplary embodiment of a roll winding device according to the invention 31 , which is realized here in the form of a carrier roll winding device. Essential components of this slitter 31 are an unwinding device 32 in which, in width, substantially the working width of one of the slitter-winder 31 upstream and not shown here paper machine corresponding, paper web M from a parent role 33 is deducted, a cutting section 34 in which the paper web M is longitudinally divided into selectable width formats for producing partial webs M 'and a winding arrangement located in the region of its winding 35 ,

The cutting section 34 For this purpose, a plurality of blade arrangements in the Y direction along a cross-beam 36 are positionable. The crossbeam is in the present example in an upper part 36a who is the knife holder 1 with the upper knives 4 wears and a lower part 36b who split the bottom knife carries. To vibrations of the running material web M in the cutting section 34 To prevent this area is in the example shown by pulleys 37 limited. The winding arrangement 35 has two support rollers 38 on, of which at least one is drivable. Preferably, both support rollers 38 drivable and are connected via a common control and / or regulating device in connection, which may also be in communication with the known from the preceding figure descriptions control device R, or may be identical to this. The above-arranged circular arc cutouts shown in the above figures on the control device R are intended to indicate a radio signal. Of course, cable-based transmissions are also conceivable. In connection with the winding arrangement of a slitting device designed as a slitter-winder, it has proven useful if the first support roll, in the running direction of the paper web M, is used 38 speed controlled and the second support roller 38 is torque-controlled. Also, an elastic storage of at least one support roller 38 conceivable. Similarly, the axes of the support rollers 38 be stored at different height levels in the Z direction. Furthermore, the support rollers 38 have different diameter. Of course, at least one of the two support rollers 38 Also, one, on the web M effective becoming coating or sheathing, while, for example, the other support roller 38 is designed as a steel roller. Furthermore, at least one of the support rollers 38 have a passive or active damping or a repayment element. However, these advantageous embodiments are known to the person skilled in the art and are not shown here in detail for reasons of clarity.

In addition to the support rollers 38 form the at least one winding roll to be wound 39 and the platen roller 40 essential elements of the winding arrangement 35 , Although in 1 only the front of a single winding roll 39 is visible, it should be assumed that in the Y-direction extending in the image plane more bobbins 39 exactly behind the illustrated winding roll 39 in which from the two support rollers 38 formed winding bed, are.

The forming during the winding process winding rollers 39 consist in their core each of a winding tube, with the beginning of a finite portion of a paper web M, or a partial web M ', connected and then spanned by continuous wrapping to form so-called winding layers.

From the illustrated embodiments can be deviated from in various embodiments, without departing from the scope of the invention.

LIST OF REFERENCE NUMBERS

1

 knife holder

2

 Basic body / housing

3

 knife receiver

4

 Upper knife / circular knife

4a

 Cutting edge / blade

5

 Axis / main axis

6

 support means

7

 Closing or locking device

8th

 positioning device

9

 lower blade

9a

 Top of the lower knife

9b

 Side surface (working surface) of the lower blade

10

 blade assembly

11

 joint

11a

 eccentric

11b

 Adjustment device (for eccentric)

11c

 Peripheral surface (of the eccentric)

12

 attack

13

 Drive (pneumatic cylinder)

14

 Drive (electric motor)

15

 toggle mechanism

16

 Drive (rotary actuator)

17a

 cable

17b

 mainspring

18

 rack

19

 Linear guide (dovetail)

20

 pneumatic cylinder

21

 sensor

22

 axis

23

 gear

24

 guide

25

 guide body

26

 electromagnet

27

 electromagnet

28

 Protection / protection

28a

 Bottom (of the protection)

29

 Device for height adjustment

30

 positioning device

31

 Device for longitudinal cutting of a material web (roll winding cutting device)

32

 unwinding

33

 motherhood

34

 slitting section

35

 winding arrangement

36

 Knife holder crossbeam / crossbeam

36a

 Knife holder traverse / cross-beam (upper part)

36b

 Knife holder crossbeam / crossbeam (lower part)

37

 idler pulley

38

 king roll

39

 reel

40

 platen

α

 angle

M

 Material web, paper web

R

 control device

S

 (lower) vertex

RP

 rest position

SP

 cutting position

BSt

 provision

sst

 protective position

X

 Longitudinal direction (X-direction)

Y

 Horizontal direction (Y direction), transverse direction

Z

 Vertical direction (Z direction)

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been 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 1024341 [0008]
• DE 4114059 A1 [0009]
• DE 2657792 A1 [0013]
• DE 29712149 U1 [0014]

Claims (15)

Knife holder for an upper knife for a knife assembly for a device for longitudinal cutting of a running material web, the knife assembly comprising superimposed upper blade and lower blade, and wherein the upper blade by means of a Anstelleinrichtung along a vertical (Z-direction) and a horizontal (Y-direction) path movable against the lower blade and can be brought from a rest position to a cutting position, characterized in that the adjusting device is designed and arranged such that the upper blade at least partially overlaid along the vertical and horizontal paths to be overcome is movable. Knife holder according to claim 1, characterized in that the upper blade is movable along the paths to be overcome. Knife holder according to one of claims 1 to 2, characterized in that the upper blade in a smooth shape, preferably at least partially movable in a circular arc or elliptical arc shape along the paths to be overcome, in particular feasible. Knife holder according to one of claims 1 to 3, characterized in that the knife holder has an axis about which the upper knife is pivotable from the rest position to the cutting position. Knife holder according to one of claims 1 to 3, characterized in that the knife holder has a linear guide which is inclined relative to the material web, that they between the rest position and cutting position to be overcome path portions of the upper knife, in the vertical (Z) and in horizontal (Y-) direction covered. Knife holder according to one of claims 1 to 3, characterized in that the knife holder comprises a movable guard, which is movable from a provision in a protective position in which it prevents contact between the upper blade and the material web. Knife holder according to claim 6, characterized in that the protection is in operative connection with the adjusting device such that it is automatically moved into a provision when the upper blade is moved from the rest position to the cutting position. Knife holder according to one of claims 1 to 7, characterized in that the upper blade can be brought by means of a single drive from the rest position to the cutting position, wherein the adjustment of the cutting force by the same drive is vornehmbar. Knife holder according to one of claims 1 to 8, characterized in that for adjusting a, be formed between upper and lower blade, cutting angle, a stop is provided by which the movement of the upper blade in the region of the cutting position can be limited. Knife holder according to one of claims 1 to 9, characterized in that the adjusting device is designed and arranged such that it is suitable next to a first movement path along which the upper knife from the rest position to the cutting position can be brought to form a second movement path, extending from the first movement path at least partially different and along the upper blade of the cutting position can be brought into the rest position. Knife holder according to one of claims 1 to 10, characterized in that the drive comprises at least one of the following components: - Pneumatic cylinder - Hydraulic cylinder - gear - rack - Knee joint - cable - Linear motor - Linear guide - wedge mechanism - Magnet, in particular electromagnet Device for longitudinal cutting of a moving material web, characterized in that the device comprises at least one knife holder according to one of claims 1 to 11. A method for longitudinal cutting of a running material web, characterized in that for cutting the length of the material web a knife assembly is used which comprises a knife holder according to one of claims 1 to 11. A method according to claim 13, characterized in that the material web is cut longitudinally before a winding and in particular between a winding and a winding. Method according to one of claims 13 or 14, characterized in that the upper blade is moved from the rest position into the cutting position through an already running material web.

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