EP2200788B1 - Device and method for guiding a material web - Google Patents

Device and method for guiding a material web Download PDF

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Publication number
EP2200788B1
EP2200788B1 EP08828979.8A EP08828979A EP2200788B1 EP 2200788 B1 EP2200788 B1 EP 2200788B1 EP 08828979 A EP08828979 A EP 08828979A EP 2200788 B1 EP2200788 B1 EP 2200788B1
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EP
European Patent Office
Prior art keywords
web
material web
longitudinal cutting
cutting device
longitudinal
Prior art date
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Active
Application number
EP08828979.8A
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German (de)
French (fr)
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EP2200788A1 (en
Inventor
Holger Frische
Werner Beckonert
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Windmoeller and Hoelscher KG
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Windmoeller and Hoelscher KG
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Publication of EP2200788A1 publication Critical patent/EP2200788A1/en
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Publication of EP2200788B1 publication Critical patent/EP2200788B1/en
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B26—HAND CUTTING TOOLS; CUTTING; SEVERING
    • B26D—CUTTING; DETAILS COMMON TO MACHINES FOR PERFORATING, PUNCHING, CUTTING-OUT, STAMPING-OUT OR SEVERING
    • B26D5/00—Arrangements for operating and controlling machines or devices for cutting, cutting-out, stamping-out, punching, perforating, or severing by means other than cutting
    • B26D5/02—Means for moving the cutting member into its operative position for cutting
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B26—HAND CUTTING TOOLS; CUTTING; SEVERING
    • B26D—CUTTING; DETAILS COMMON TO MACHINES FOR PERFORATING, PUNCHING, CUTTING-OUT, STAMPING-OUT OR SEVERING
    • B26D1/00—Cutting through work characterised by the nature or movement of the cutting member or particular materials not otherwise provided for; Apparatus or machines therefor; Cutting members therefor
    • B26D1/01—Cutting through work characterised by the nature or movement of the cutting member or particular materials not otherwise provided for; Apparatus or machines therefor; Cutting members therefor involving a cutting member which does not travel with the work
    • B26D1/02—Cutting through work characterised by the nature or movement of the cutting member or particular materials not otherwise provided for; Apparatus or machines therefor; Cutting members therefor involving a cutting member which does not travel with the work having a stationary cutting member
    • B26D1/03—Cutting through work characterised by the nature or movement of the cutting member or particular materials not otherwise provided for; Apparatus or machines therefor; Cutting members therefor involving a cutting member which does not travel with the work having a stationary cutting member with a plurality of cutting members
    • B26D1/035—Cutting through work characterised by the nature or movement of the cutting member or particular materials not otherwise provided for; Apparatus or machines therefor; Cutting members therefor involving a cutting member which does not travel with the work having a stationary cutting member with a plurality of cutting members for thin material, e.g. for sheets, strips or the like
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B26—HAND CUTTING TOOLS; CUTTING; SEVERING
    • B26D—CUTTING; DETAILS COMMON TO MACHINES FOR PERFORATING, PUNCHING, CUTTING-OUT, STAMPING-OUT OR SEVERING
    • B26D9/00—Cutting apparatus combined with punching or perforating apparatus or with dissimilar cutting apparatus
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B26—HAND CUTTING TOOLS; CUTTING; SEVERING
    • B26D—CUTTING; DETAILS COMMON TO MACHINES FOR PERFORATING, PUNCHING, CUTTING-OUT, STAMPING-OUT OR SEVERING
    • B26D7/00—Details of apparatus for cutting, cutting-out, stamping-out, punching, perforating, or severing by means other than cutting
    • B26D2007/0012—Details, accessories or auxiliary or special operations not otherwise provided for
    • B26D2007/0068—Trimming and removing web edges
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B26—HAND CUTTING TOOLS; CUTTING; SEVERING
    • B26D—CUTTING; DETAILS COMMON TO MACHINES FOR PERFORATING, PUNCHING, CUTTING-OUT, STAMPING-OUT OR SEVERING
    • B26D5/00—Arrangements for operating and controlling machines or devices for cutting, cutting-out, stamping-out, punching, perforating, or severing by means other than cutting
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B26—HAND CUTTING TOOLS; CUTTING; SEVERING
    • B26D—CUTTING; DETAILS COMMON TO MACHINES FOR PERFORATING, PUNCHING, CUTTING-OUT, STAMPING-OUT OR SEVERING
    • B26D7/00—Details of apparatus for cutting, cutting-out, stamping-out, punching, perforating, or severing by means other than cutting
    • B26D7/18—Means for removing cut-out material or waste
    • B26D7/1845—Means for removing cut-out material or waste by non mechanical means
    • B26D7/1863—Means for removing cut-out material or waste by non mechanical means by suction
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2301/00—Handling processes for sheets or webs
    • B65H2301/40—Type of handling process
    • B65H2301/41—Winding, unwinding
    • B65H2301/414—Winding
    • B65H2301/4148—Winding slitting
    • B65H2301/41487—Winding slitting trimming edge

Definitions

  • the invention relates to a device according to the preamble of claim 1 and a method according to the preamble of claim 12 for guiding a material web which uses at least one longitudinal cutting means for adjusting the width of the material web, with which the web along its direction of movement (z) separable is.
  • Devices of this type are known. They are typically found downstream of equipment or machines that make or at least process the webs in a manner that results in variations in the width of the web.
  • the first category (production of webs) includes, for example, film extrusion lines in which variations in the format of the extruded films are inherent in the system. Especially with so-called cast film systems, these fluctuations are not negligible. Even with blown film equipment, there are fluctuations in the diameter of the bubble, which of course leads to variations in the width of the flattened or cut film. Even when cutting such a film fluctuations in the cutting line can occur, which also makes a trim edge of the film web necessary.
  • the second category (processing of webs) includes machines, for example laminating machines and other machines, which have a great influence on the shape of the material web.
  • Downstream of such devices for guiding and adjusting the width of the material web are often winding points, which wind the web to a winding.
  • the device for guiding and adjusting the Width of the web also structurally combined with the winding device or part of the winding device.
  • a device may also be located in the web transporting direction downstream of the device for guiding and adjusting the width of the material web which further processes the web in some way. This can happen for example through a printing press.
  • material webs of plastic, preferably plastic film, or paper are usually transported by the transport device.
  • the width of the web is adjusted by trimming it.
  • one or both edges of the web can be “cut off”.
  • the expert calls this measure “edge trimming”.
  • knife blades or wedges are known as longitudinal cutting means.
  • a jet of a medium such as water which is for example of the EP1007280 B1 is taught.
  • Even a welding agent such as a laser comes as a cutting tool in question.
  • these cutting means have the advantage not to wear. However, they have the disadvantage of high media or energy consumption.
  • the WO 2005/105635 A1 shows a device for guiding a material web, which has at least one longitudinal cutting means for adjusting the width of the material web, with which the web along its Movement direction (z) in at least two partial webs, one of which is the edge strips, is separable.
  • the edge strip is passed to a gripping and transporting device and separated at a later time, by means of a cutting device.
  • pamphlets US 3762250 and DE 9203472 U1 show devices with slitters and beyond sensors for web observation.
  • the DE9203472U shows a device according to the preamble of claim 1 and a method according to the preamble of claim 12.
  • the material web can be deflected laterally away from the knife edge, wherein the knife edge no longer performs any edge trimming. This can cause problems in the further processing of the web. Also machine downtime can not be excluded, which can cause high costs.
  • the object of the present invention is to propose a device which avoids the disadvantages described above.
  • the width of the web is detected by a sensor.
  • the reflection or transmission of the film eg optically
  • the cutting means is deactivated so moved away in the case of a knife from the cutting position. This avoids that the knife obstructs the run of the material web when it comes by an increase in its width back into the cutting area. Without removing the knife from the cutting position, the widening web would run against the blunt flank of the knife and "build up" on this, as it may occur in devices of the prior art.
  • a cross-cutting device is provided in addition to the longitudinal cutting device.
  • the task of the cross-cutting device is namely to provide a partial web (edge strip) after reentry of the material web in the region of the longitudinal cutting device, with a cross section. Since the knife of the longitudinal cutting device, only after renewed exceeding the nominal width of the material web is guided in this, the partial webs (edge strip and main film web) are still connected to each other via a film web. In order for at least two separate partial webs to form, a cross section of a partial web (in this case edge strips) must take place.
  • the at least one transverse cutting device is mounted further downstream than the longitudinal cutting device and provided with a control unit.
  • This control unit calculates the time difference in which the knife of the cross cutting device must enter the material web to perform the cross section when the beginning of the longitudinal section has arrived at the cross section.
  • the time difference, which must have the cross section compared to the "new" longitudinal section, is mainly dependent on the conveying speed of the material web.
  • only one entry or exit of web material in the region of a longitudinal cutting device is detected by a sensor.
  • the knife Upon entering the web material in the region of a slitter, the knife is inserted into the web. This process is called “activation” of the slitter.
  • activation When the web material emerges from the region of the longitudinal cutting device, the knife is pulled out of the material web. This process is called “deactivation” of the slitter.
  • the longitudinal cutting device is activated only when the material web already protrudes beyond the potential cutting region of the longitudinal cutting device, the so-called effective region of the longitudinal cutting device.
  • the proportion of the edge region, which the expert calls "waste" is below 10% of the total material web width.
  • the edge strip (or the partial web) is no longer connected to the film web in the web running direction behind the longitudinal cutting device and can be supplied to the device for removing a partial web, which preferably consists of a suction device.
  • An advantage of providing the cross cutting device is that the cross section for separating the edge strip from the film web need not be made manually, which is too complicated during machine operation and therefore causes machine downtime.
  • the above-mentioned suction device for discharging a partial web can, in a particularly preferred embodiment, consist of a suction proboscis which is adjustably mounted perpendicular to the transport direction of the material web.
  • the edge strip can be optimally removed from the remaining material web.
  • the individual partial webs are transported synchronously via a conveyor roller. Subsequently, a partial web (here the edge strip) is removed from the suction device.
  • the longitudinal cutting device can be folded away with a component orthogonal to the material web or to the plane of the material web surface.
  • optical sensors When selecting the sensors that provide the readings that indicate the width or presence of the web, it is beneficial to use optical sensors. If these are mounted and adjusted to measure the transmission or reflection of light, advantageously sensors will be used which can measure the intensity of the light falling on the effective area of the sensor. For sensors measuring light reflection for these purposes, often the radiation source and the sensor will be mounted on one side of the web. To implement such systems, integrated light source and sensor devices are available on the market.
  • This Gutsignal is at least significantly weaker when material of the web is on the path of the light between the light source and the sensor. From this difference in intensity, a very useful measurement signal can be obtained.
  • Fig. 1 shows the front view and Fig. 2 the side view along the section AA of a device according to the invention.
  • the material web 1 is guided via a guide roller 2 to a spreader roller 22, which serves for stretching the material web 1 transversely to the transport direction z.
  • the material web 1 is transported downstream to the first longitudinal cutting devices 5a, 5b, which divide the material web 1 into individual advantages 1a, 1b, 1c and the edge region or edge section 1a ', 1b'.
  • the longitudinal cutting devices 5a, 5b are mounted on a cutter bar 18 and laterally displaceable on this.
  • the longitudinal cutting devices 5a, 5b consist of a holder, which can each accommodate two blade pushers, the respective lower blade cutting the material web 1.
  • the upper blade can be replaced by a simple pusher 8, the worn lower blade during operation.
  • the lateral position of the longitudinal cutting devices 5a, 5b can be reproducibly adjusted by means of scale units which are mounted on the cutter bar 18.
  • the knife bar 18 can be pivoted with the longitudinal cutting devices 5a, 5b for easier feeding or threading of the material web 1 at the start of production pneumatically through the cylinder 19 orthogonal to the material web 1.
  • the cutter bar includes a pivoting motion that also includes components in the direction of the solder on the web surface (in FIG. 3 y-direction) is pivoted away from the material web 1.
  • a pivoting motion that also includes components in the direction of the solder on the web surface (in FIG. 3 y-direction) is pivoted away from the material web 1.
  • a knife bar of course, only one knife or several knives could be individually swung away in such a way. It is important that the movement or movements encourage the knives out of the plane of the web in the area of the cut.
  • Each longitudinal cutting device 5a, 5b is provided with a spring-loaded fender for Secured protection of the cutting blades. When swinging the knife bar, the cutting blades disappear inside the mudguard.
  • the blade slider 8 is additionally equipped with a pneumatic cylinder 7, with which the blades can be moved away from the material web 1 or toward the material web 1.
  • the driving in of the blade into the material web 1 is referred to below as “activation” and the driving away with “deactivation” of the longitudinal cutting devices 5a.
  • the pneumatic cylinder 7 is controlled by a control device comprising two sensors 3a, 3b, which are mounted above the longitudinal cutting devices 5a. These are, for example, optical sensors, for example infrared sensors. But tactile sensors are also conceivable here. These sensors 3a, 3b detect whether the width of the edge strip 21 is greater than the distance between sensor 3a and 3b.
  • a transverse pivoting 21 of the cutter bar 18 is attached.
  • the longitudinal cutting devices 5a, 5b equipped with a L Lucasschangtechnik 20 so that the material web 1 is not always performed on the same position of the blade.
  • the blades of the slitter 5 a, 5 b are equipped with a heater, since tests have shown that heated blades give a better cut quality.
  • This assembly consists of two plates 15, which are connected to one another via cross members, and is mounted rotatably about the axis 13 to the lateral frame 25 of the device.
  • the rubberized preferred roller 9 which is mounted between the plates 15, are pressed against the lower guide roller 4.
  • two laterally displaceable discharge devices 11 for the edge strips 1a ', 1b' are arranged.
  • This can be suction funnels, but also purely mechanical pick-off devices.
  • the lateral positioning of the discharge devices 11 can be done via a scale.
  • a suction hose 14 and a not shown here associated exhaust fan are mounted.
  • a cross-cutting device 10 is movably mounted. The knife of the cross-cutting device 10 can be moved via a pneumatic cylinder 12 in the direction of the material web 1. The material web 1 then passes over a further guide roller, to a spreader roller 17, via cooling rollers 24 and a contact roller to the web winding 23rd
  • the material web 1 can pass outside the region of the longitudinal cutting devices 5a.
  • the absence of the edge region 21 is detected by the sensor 3b, which sends a signal to the longitudinal cutting means 5a, so that the pneumatic cylinder 7 pulls the blade with the lower blade holder 8 from the material web 1. Now no edge strip 21 is separated from the web 1 more.
  • this 1 again enters the region of the longitudinal cutting devices 5a.
  • the sensor 3a registers the shrinkage of the material web 1 in the edge region. If the edge region is large enough so that an edge strip 21 can be cut off, this is registered by the sensor 3b and a signal from this 3b is sent to the longitudinal cutting devices 5a. Then, the blade with the lower blade holder 8 is guided to the material web 1 with the pneumatic cylinder 7 and a longitudinal section performed.
  • the edge strip 21 is still connected to the benefit 1a, 1c and now runs together with this 1a, 1b, 1c further downstream in the direction of the roll 23.
  • the edge strip 21 from the benefits 1a, 1c to separate and insert into the discharge device 11 can, shortly after immersion of the blade of the longitudinal cutting device 5a in the web 1, a cross section of the edge strip 21 by the cross-sectional device 10 done.
  • the cross-cutting device 10 is supplied with a signal from the control device, which takes place with a time delay to the entry of the blade of the longitudinal cutting devices 5a in the web 1.
  • the cross cutting blade of the cross cutting device 10 is connected to the pneumatic cylinder 12 in the direction of Material web 1 moves. By the blade of the cross-cutting blade of the edge strip 21 is slowed down in its movement downstream.
  • FIGS. 3 to 5 show a sketched procedure of an embodiment of a method according to the invention at three different times.
  • FIG. 1 the situation is shown at a first time point A.
  • the blades 31 are in their cutting position 35. They have severed the web 1 along the cutting line 32.
  • the web is moved in the direction z indicated by the arrow.
  • the dashed line 33 indicates which path the cutting line continues to take when the blades 31 remain in their cutting position as the web is moved further.
  • the sensor 29 to see. He is the cutting blades 31 upstream of the web running direction. Already in FIG. 3 Therefore, it can be foreseen that the area of narrower web 34 first reaches sensor 29 and then only position 35 of blades 31.
  • FIG. 4 shows the situation that arises at this second time.
  • the narrower web section 34 has already reached the sensor 29. This has activated an actuator, not shown, which pulls the blades 31 from its cutting position.
  • This circumstance will be in FIG. 4 symbolized by the dotted lines 30, which represent the emerging from the web knives.
  • This "emergence process" can happen so quickly that part of the in FIG. 4 dashed line 30 is no longer severed. In this case, however, there could be complications, since the edge strips 21 then hang on the web and are not completely separated. If the edge strips 21 of a discharge 11th be fed as they are in the FIGS. 1 and 2 shown, this may lead, inter alia, to the demolition of the edge strips 21 and thus damage to the web edges. Therefore, it seems advantageous to leave the knife or blades 31 in a cutting-active position 35 until they actually reach the constriction of the web 1 and completely separate the edge strip or strips 21.
  • FIG. 5 illustrates Another very advantageous possibility: to bring the knives 31 back into cutting position (best by a movement that contains at least components in the direction of the solder on the plane of the web 1, spatial direction y), if wider locations of the web already the one or more knives 31 (at least one knife or cutting means will be needed) will have passed.
  • FIG. 5 illustrated situation: The edge strips 21 initially remain connected via web material which is located between the dipping point 35 of the knives 31 and the center of the area of narrower foil web. After dipping the knives in the web, they separate again the web 1 from the edge strips 21, which is indicated by the line 32 in the lower part of the FIG. 5 is shown.
  • the beginning of the edge strip 31, which is partially separated after a region of narrower film, is first fed to further processing by following the web 1.
  • further processing will initially consist of winding on a web winding 23.
  • the edge strip 21 is severed by a cross cutting cut and the leading end of the severed edge strip 21 is received by a discharge device 11.
  • One endeavor can be to keep the length of the part of the marginal strip, which is wound with on the winding, small, so that the cross cutting cut is made directly at the beginning or shortly after the beginning of the marginal strip.
  • the following means can advantageously be used for the technical implementation of the methods presented above:
  • a controller / computer communicating with at least a portion of the aforementioned machine components and configured to perform the method. This is often computer-implemented, preferably done with a program.
  • the relevant computer program or suitable data sequences can be made available to a control device / computer on a data medium or as a data stream (eg by e-mail).
  • Knife or knife actuators which move the knives out of the web plane are advantageous for carrying out the methods outlined above.
  • Good here is a movement that contains at least one component which is orthogonal to the plane of the web in the cutting area (y-direction). This can be a pivoting movement. However, a translation is also conceivable. This can also be exactly orthogonal to the orbital plane.
  • the discharge device can advantageously be equipped with a suction device, so that it sucks the film to be discharged. Some (at least one), if not all, longitudinal and transverse cutting operations and the associated blade movements should be able to be done on-the-fly, that is, while the machine is running.

Description

Die Erfindung betrifft eine Vorrichtung gemäß dem Oberbegriff des Anspruchs 1 sowie ein Verfahren gemäß dem Oberbegriff des Anspruchs 12 zur Führung einer Materialbahn, welche beziehungsweise welches zur Einstellung der Breite der Materialbahn zumindest ein Längsschneidmittel nutzt, mit welcher die Bahn entlang ihrer Bewegungsrichtung (z) trennbar ist.The invention relates to a device according to the preamble of claim 1 and a method according to the preamble of claim 12 for guiding a material web which uses at least one longitudinal cutting means for adjusting the width of the material web, with which the web along its direction of movement (z) separable is.

Vorrichtungen dieser Art sind bekannt. Sie finden sich in der Regel stromabwärts von Anlagen oder Maschinen, die die Materialbahnen herstellen oder zumindest in einer Weise bearbeiten, die zu Schwankungen der Breite der Bahn führt.Devices of this type are known. They are typically found downstream of equipment or machines that make or at least process the webs in a manner that results in variations in the width of the web.

In die erste Kategorie (Herstellung von Materialbahnen) gehören zum Beispiel Folienextrusionsanlagen, bei denen Schwankungen des Formats der extrudierten Folien systemimmanent sind. Gerade bei so genannten Gießfolienanlagen sind diese Schwankungen nicht zu vernachlässigen. Auch bei Blasfolienanlagen kommt es zu Schwankungen des Durchmessers der Blase, was natürlich auch zu Schwankungen der Breite der flachgelegten oder aufgeschnittenen Folie führt. Auch beim Aufschneiden einer solchen Folie können Schwankungen der Schnittlinie auftreten, was ebenfalls einen Randbeschnitt der Folienbahn notwendig macht.The first category (production of webs) includes, for example, film extrusion lines in which variations in the format of the extruded films are inherent in the system. Especially with so-called cast film systems, these fluctuations are not negligible. Even with blown film equipment, there are fluctuations in the diameter of the bubble, which of course leads to variations in the width of the flattened or cut film. Even when cutting such a film fluctuations in the cutting line can occur, which also makes a trim edge of the film web necessary.

In die zweite Kategorie (Bearbeiten von Bahnen) gehören Maschinen, beispielsweise Laminiermaschinen und andere Maschinen, die großen Einfluss auf die Gestalt der Materialbahn ausüben.The second category (processing of webs) includes machines, for example laminating machines and other machines, which have a great influence on the shape of the material web.

Stromabwärts solcher Vorrichtungen zur Führung und Einstellung der Breite der Materialbahn befinden sich oft Wickelstellen, die die Materialbahn zu einem Wickel aufwickeln. Oft ist die Vorrichtung zur Führung und Einstellung der Breite der Materialbahn auch baulich mit der Wickelvorrichtung vereinigt beziehungsweise Bestandteil der Wickelvorrichtung.Downstream of such devices for guiding and adjusting the width of the material web are often winding points, which wind the web to a winding. Often, the device for guiding and adjusting the Width of the web also structurally combined with the winding device or part of the winding device.

Statt der Wickelvorrichtung kann sich jedoch auch eine Vorrichtung in der Bahntransportrichtung stromabwärts der Vorrichtung zur Führung und Einstellung der Breite der Materialbahn befinden, die die Bahn in irgendeiner Weise weiterverarbeitet. So etwas kann zum Beispiel durch eine Druckmaschine geschehen. Die genannten Beispiele zeigen, dass in der Regel Materialbahnen aus Kunststoff, vorzugsweise Kunststofffolie, oder Papier durch die Transportvorrichtung transportiert werden.However, instead of the winding device, a device may also be located in the web transporting direction downstream of the device for guiding and adjusting the width of the material web which further processes the web in some way. This can happen for example through a printing press. The examples mentioned show that material webs of plastic, preferably plastic film, or paper are usually transported by the transport device.

Wie eingangs angemerkt, wird die Breite der Materialbahn durch ein Beschneiden derselben eingestellt. So können zum Beispiel ein oder beide Ränder der Bahn "abgeschnitten" werden. Der Fachmann nennt diese Maßnahme "Randbeschnitt". Allerdings ist es ebenso bekannt, eine Bahn in mehrere "Nutzen", das heißt mehrere zu nutzende Materialbahnen längs ihrer Laufrichtung zu zerschneiden.As noted initially, the width of the web is adjusted by trimming it. For example, one or both edges of the web can be "cut off". The expert calls this measure "edge trimming". However, it is also known to cut a web into several "benefits", that is to say a plurality of material webs to be used along its direction of travel.

Als Längsschneidmittel sind natürlich Messerklingen oder Keile bekannt. Es ist jedoch auch möglich, den Längsschnitt durch einen Strahl eines Mediums wie Wasser vorzunehmen, was beispielsweise von der EP1007280 B1 gelehrt wird. Auch ein Schweißmittel wie ein Laser kommt als Schneidmittel in Frage. Gegenüber den Längsschneideinrichtungen mit Messern oder Keilen haben diese Schneidmittel den Vorteil nicht zu verschleißen. Sie haben jedoch den Nachteil eines hohen Medien- oder Energieverbrauchs.Of course, knife blades or wedges are known as longitudinal cutting means. However, it is also possible to make the longitudinal section through a jet of a medium such as water, which is for example of the EP1007280 B1 is taught. Even a welding agent such as a laser comes as a cutting tool in question. Compared with the longitudinal cutting devices with knives or wedges, these cutting means have the advantage not to wear. However, they have the disadvantage of high media or energy consumption.

Insbesondere bei Längsschneidemitteln, die ein Messer oder einen Keil zum Zerschneiden der Bahn aufweisen, führen größere Bahnschwankungen oft zu einer Deaktivierung der Schneidvorrichtung oder gar zu Schwierigkeiten im Bereich der nach gelagerten Verarbeitung oder Aufwicklung der Bahn.Especially with longitudinal cutters having a knife or a wedge for cutting the web, larger web variations often lead to deactivation of the cutting device or even difficulties in the area of downstream processing or winding of the web.

Die WO 2005/105635 A1 zeigt eine Vorrichtung zur Führung einer Materialbahn, welche zur Einstellung der Breite der Materialbahn zumindest ein Längsschneidmittel aufweist, mit welcher die Bahn entlang ihrer Bewegungsrichtung (z) in zumindest zwei Teilbahnen, von denen eine der Randstreifen ist, trennbar ist. Der Randstreifen wird einer Greif- und Transportvorrichtung übergeben und zu einem späteren Zeitpunkt, mittels einer Schneidvorrichtung, abgetrennt.The WO 2005/105635 A1 shows a device for guiding a material web, which has at least one longitudinal cutting means for adjusting the width of the material web, with which the web along its Movement direction (z) in at least two partial webs, one of which is the edge strips, is separable. The edge strip is passed to a gripping and transporting device and separated at a later time, by means of a cutting device.

Auch die Druckschriften US 3762250 und DE 9203472 U1 zeigen Vorrichtungen mit Längsschneideeinrichtungen und darüber hinaus Sensoren zur Bahnbeobachtung.Also the pamphlets US 3762250 and DE 9203472 U1 show devices with slitters and beyond sensors for web observation.

Die Druckschrift US 3 545 686 zeigt eine Querschneidevorrichtung.The publication US 3,545,686 shows a cross cutting device.

Die DE9203472U zeigt eine Vorrichtung gemäß dem Oberbegriff des Anspruchs 1 sowie ein Verfahren gemäß dem Oberbegriff des Anspruchs 12.The DE9203472U shows a device according to the preamble of claim 1 and a method according to the preamble of claim 12.

Bei Vorrichtungen zum Fördern und Bearbeiten von Materialbahnen können Schwankungen der Breite der Materialbahn dazu führen, dass das Messer der Längsschneidvorrichtung nicht mehr in Kontakt mit der Materialbahn steht. Dies ist dann der Fall, wenn die Bahnbreite durch Produktionsfehler schmaler als die Sollbreite oder gerade gleich dieser Sollbreite ist. In diesem Fall fällt kein Randstreifen an.In devices for conveying and processing material webs, variations in the width of the material web can lead to the blade of the longitudinal cutting device no longer being in contact with the material web. This is the case when the web width is narrower than the target width due to production errors or just equal to this target width. In this case, no edge strip is applied.

Erhöht sich anschließend die Breite der Materialbahn über den Bereich der Längsschneidevorrichtung hinaus, so kann die Materialbahn seitlich von der Messerflanke abgelenkt werden, wobei die Messerschneide keinen Randbeschnitt mehr durchführt. Dadurch können Probleme bei der Weiterverarbeitung der Bahn entstehen. Auch Maschinenstillstände sind nicht auszuschließen, was hohe Kosten verursachen kann.If the width of the material web then increases beyond the region of the longitudinal cutting device, then the material web can be deflected laterally away from the knife edge, wherein the knife edge no longer performs any edge trimming. This can cause problems in the further processing of the web. Also machine downtime can not be excluded, which can cause high costs.

Daher besteht die Aufgabe der vorliegenden Erfindung darin, eine Vorrichtung vorzuschlagen, die die oben beschriebenen Nachteile vermeidet.Therefore, the object of the present invention is to propose a device which avoids the disadvantages described above.

Diese Aufgabe wird durch die kennzeichnenden Merkmale des Anspruchs 1 gelöst.This object is solved by the characterizing features of claim 1.

Bei einer erfindungsgemäßen Vorrichtung wird die Breite der Bahn mit einem Sensor detektiert. Dazu kann die Reflexion oder Transmission der Folie (z. B. optisch) an bestimmten Punkten entlang der Breite der Bahn gemessen werden. Ist in dem Bereich, in dem der Schnitt vorgenommen werden soll, keine Folie vorhanden, dann wird das Schneidmittel deaktiviert also im Falle eines Messers aus der Schneidposition weggefahren. Dadurch wird vermieden, dass das Messer den Lauf der Materialbahn behindert, wenn diese durch eine Zunahme ihrer Breite wieder in den Schneidbereich kommt. Ohne Abziehen des Messers aus der Schneidposition, würde die breiter werdende Materialbahn gegen die stumpfe Flanke des Messers laufen und sich an dieser "aufbauen", wie es bei Vorrichtungen des Standes der Technik vorkommen kann.In a device according to the invention, the width of the web is detected by a sensor. For this purpose, the reflection or transmission of the film (eg optically) can be measured at certain points along the width of the web. Is not in the area in which the cut is to be made Foil present, then the cutting means is deactivated so moved away in the case of a knife from the cutting position. This avoids that the knife obstructs the run of the material web when it comes by an increase in its width back into the cutting area. Without removing the knife from the cutting position, the widening web would run against the blunt flank of the knife and "build up" on this, as it may occur in devices of the prior art.

Erfindungsgemäß ist zusätzlich zu der Längsschneidvorrichtung noch eine Querschneidvorrichtung vorgesehen. Die Aufgabe der Querschneidvorrichtung besteht nämlich darin, eine Teilbahn (Randstreifen) nach Wiedereintritt der Materialbahn in den Bereich der Längsschneidvorrichtung, mit einem Querschnitt zu versehen. Da das Messer der Längsschneidvorrichtung, erst nach erneutem Überschreiten der Sollbreite der Materialbahn in diese geführt wird, sind die Teilbahnen (Randstreifen und Hauptfolienbahn) noch über eine Folienbahne miteinander verbunden. Damit wieder zumindest zwei voneinander getrennte Teilbahnen entstehen können, muss ein Querschnitt einer Teilbahn (hier Randstreifen) erfolgen.According to the invention, a cross-cutting device is provided in addition to the longitudinal cutting device. The task of the cross-cutting device is namely to provide a partial web (edge strip) after reentry of the material web in the region of the longitudinal cutting device, with a cross section. Since the knife of the longitudinal cutting device, only after renewed exceeding the nominal width of the material web is guided in this, the partial webs (edge strip and main film web) are still connected to each other via a film web. In order for at least two separate partial webs to form, a cross section of a partial web (in this case edge strips) must take place.

Erfindungsgemäß ist die zumindest eine Querschneidvorrichtung weiter stromabwärts angebracht als die Längsschneidvorrichtung und mit einer Steuereinheit versehen. Diese Steuereinheit berechnet die Zeitdifferenz in welcher das Messer der Querschneidevorrichtung in die Materialbahn eintreten muss, um den Querschnitt durchzuführen, wenn der Beginn des Längsschnitts an der Querschnittstelle angekommen ist. Die Zeitdifferenz, die der Querschnitt gegenüber dem "neuen" Längsschnitt haben muss, ist vor allem abhängig von der Fördergeschwindigkeit der Materialbahn.According to the invention, the at least one transverse cutting device is mounted further downstream than the longitudinal cutting device and provided with a control unit. This control unit calculates the time difference in which the knife of the cross cutting device must enter the material web to perform the cross section when the beginning of the longitudinal section has arrived at the cross section. The time difference, which must have the cross section compared to the "new" longitudinal section, is mainly dependent on the conveying speed of the material web.

In einer besonders bevorzugten Ausführungsform wird lediglich ein Eintreten oder Austreten von Bahnmaterial in den Bereich einer Längsschneidevorrichtung von einem Sensor detektiert. Beim Eintreten des Bahnmaterials in den Bereich einer Längsschneidevorrichtung wird das Messer in die Materialbahn eingeführt. Dieser Vorgang wird mit "Aktivierung" der Längsschneidevorrichtung bezeichnet. Beim Austreten des Bahnmaterials aus dem Bereich der Längsschneidevorrichtung wird das Messer aus der Materialbahn herausgezogen. Dieser Vorgang wird "Deaktivierung" der Längsschneidevorrichtung genannt.In a particularly preferred embodiment, only one entry or exit of web material in the region of a longitudinal cutting device is detected by a sensor. Upon entering the web material in the region of a slitter, the knife is inserted into the web. This process is called "activation" of the slitter. When the web material emerges from the region of the longitudinal cutting device, the knife is pulled out of the material web. This process is called "deactivation" of the slitter.

In den meisten Fällen wird die Längsschneidevorrichtung erst dann aktiviert, wenn die Materialbahn bereits über den potentiellen Schnittbereich der Längsschneidevorrichtung, den so genannten Wirkbereich der Längsschneidevorrichtung, herausragt.In most cases, the longitudinal cutting device is activated only when the material web already protrudes beyond the potential cutting region of the longitudinal cutting device, the so-called effective region of the longitudinal cutting device.

Idealerweise liegt der Anteil des Randbereiches, den der Fachmann mit "Verschnitt" bezeichnet, unterhalb von 10% der gesamten Materialbahnbreite.Ideally, the proportion of the edge region, which the expert calls "waste", is below 10% of the total material web width.

Nach dem Querschneiden ist der Randstreifen (oder die Teilbahn) in Bahnlaufrichtung hinter der Längsschneidevorrichtung nicht mehr mit der Folienbahn verbunden und kann der Vorrichtung zum Abführen einer Teilbahn, die in bevorzugter Weise aus einer Absaugvorrichtung besteht, zuführbar gemacht werden.After cross-cutting, the edge strip (or the partial web) is no longer connected to the film web in the web running direction behind the longitudinal cutting device and can be supplied to the device for removing a partial web, which preferably consists of a suction device.

Ein Vorteil des Vorsehens der Querschneidvorrichtung besteht darin, dass der Querschnitt zum Trennen des Randstreifens von der Folienbahn nicht mehr händisch vorgenommen werden muss, was während des Maschinenbetriebes zu kompliziert ist und deswegen Maschinenstillstände verursacht.An advantage of providing the cross cutting device is that the cross section for separating the edge strip from the film web need not be made manually, which is too complicated during machine operation and therefore causes machine downtime.

Die oben bereits erwähnte Absaugvorrichtung zum Abführen einer Teilbahn kann in einer besonders bevorzugten Ausführungsform aus einem Saugrüssel bestehen, der senkrecht zur Transportrichtung der Materialbahn justierbar angebracht ist. Dadurch kann der Randstreifen optimal von der restlichen Materialbahn abgeführt werden.The above-mentioned suction device for discharging a partial web can, in a particularly preferred embodiment, consist of a suction proboscis which is adjustably mounted perpendicular to the transport direction of the material web. As a result, the edge strip can be optimally removed from the remaining material web.

In einer weiteren bevorzugten Ausführungsform werden die einzelnen Teilbahnen über eine Förderwalze synchron weiter transportiert. Anschließend wird eine Teilbahn (hier der Randstreifen) von der Absaugvorrichtung abgeführt.In a further preferred embodiment, the individual partial webs are transported synchronously via a conveyor roller. Subsequently, a partial web (here the edge strip) is removed from the suction device.

In einer weiteren Ausführungsform ist die Längsschneidvorrichtung mit einer Komponente orthogonal zur Materialbahn beziehungsweise zur der Ebene der Materialbahnoberfläche wegklappbar. Dadurch wird das Einfädeln des Materialstranges bei Produktionsbeginn vereinfacht. Aus diesem Grund ist auch die oben beschriebene Förderwalze zum Transport der einzelnen Teilbahnen gleichermaßen wegklappbar gelagert.In a further embodiment, the longitudinal cutting device can be folded away with a component orthogonal to the material web or to the plane of the material web surface. As a result, the threading of the material strand is simplified at the start of production. For this reason, the conveying roller described above for transporting the individual partial webs is equally stored folded away.

Bei der Auswahl der Sensoren, die die Messwerte liefern, aus denen sich die Breite oder das Vorhandensein der Materialbahn ablesen lässt, ist die Verwendung optischer Sensoren von Vorteil. Wenn diese derart angebracht und eingestellt sind, dass sie die Transmission oder Reflektion von Licht messen, werden vorteilhafterweise Sensoren eingesetzt werden, die die Intensität des auf die Wirkfläche des Sensors fallenden Lichtes messen können. Bei Sensoren, die die Lichtreflexion zu diesen Zwecken messen, werden oft die Strahlungsquelle und der Sensor auf einer Seite der Materialbahn angebracht sein. Zur Realisierung solcher Systeme sind integrierte Vorrichtungen aus Lichtquelle und Sensor am Markt erhältlich.When selecting the sensors that provide the readings that indicate the width or presence of the web, it is beneficial to use optical sensors. If these are mounted and adjusted to measure the transmission or reflection of light, advantageously sensors will be used which can measure the intensity of the light falling on the effective area of the sensor. For sensors measuring light reflection for these purposes, often the radiation source and the sensor will be mounted on one side of the web. To implement such systems, integrated light source and sensor devices are available on the market.

Es kann vorteilhaft sein, als Gutsignal das von der Folie oder dem Material der Bahn reflektierte Licht zu messen. Insbesondere bei Materialbahnen, die im Bereich des aufreffenden Lichtes keine glatte sondern eine wellige oder faltige Oberfläche aufweisen, stößt diese Methode jedoch an Grenzen.It can be advantageous to measure the light reflected by the film or the material of the web as a signal of goodness. In particular, in material webs that have not smooth but a wavy or wrinkled surface in the area of the incident light, but this method is reaching its limits.

Insbesondere in diesem Zusammenhang hat es sich als vorteilhaft erwiesen, in der Richtung des von der Strahlungsquelle ausgesendeten Lichtstrahles "hinter" der Materialbahn einen stark reflektierenden Gegenstand, wie einen Spiegel anzubringen. Dieser Spiegel kann so justiert werden, dass er ein starkes "Gutsignal" zurück auf die Wirkfläche des Sensors wirft.In particular, in this context, it has proven to be advantageous, in the direction of the light beam emitted by the radiation source "behind" the material web to attach a highly reflective object, such as a mirror. This mirror can be adjusted so that it throws a strong "good signal" back to the effective surface of the sensor.

Dieses Gutsignal wird zumindest deutlich schwächer, wenn sich Material der Materialbahn auf dem Weg des Lichtes zwischen Lichtquelle und Sensor befindet. Aus diesem Intensitätsunterschied kann ein sehr brauchbares Messsignal gewonnen werden.This Gutsignal is at least significantly weaker when material of the web is on the path of the light between the light source and the sensor. From this difference in intensity, a very useful measurement signal can be obtained.

Bei solchen Vorrichtungen ist weiterhin von Vorteil, die Lichtquelle, den Bereich der Materialbahn, auf den das Licht fällt und den Sensor so zu positionieren, dass von der Materialbahn reflektierte Licht nicht direkt auf die Wirkfläche des Sensors fällt. Andernfalls könnte es insbesondere bei stark reflektierenden Bahnen zu Falschmessungen kommen.In such devices, it is furthermore advantageous to position the light source, the region of the material web onto which the light falls and to position the sensor in such a way that light reflected from the material web does not fall directly onto the active surface of the sensor. Otherwise, incorrect measurements could occur, especially with highly reflective webs.

Weitere Ausführungsbeispiele der Erfindung gehen aus der gegenständlichen Beschreibung und den Ansprüchen hervor.Further embodiments of the invention will become apparent from the description and the claims.

Die einzelnen Figuren zeigen:

Fig. 1
Querschnitt einer Vorrichtung zur Führung einer Materialbahn im Normalbetrieb
Fig. 2
Draufsicht einer Vorrichtung zur Führung einer Materialbahn im Normalbetrieb
Fig. 3
Eine Skizze eines Verfahrensablaufs zu einem ersten Zeitpunkt A
Fig. 4
Eine Skizze eines Verfahrensablaufs zu einem zweiten Zeitpunkt B
Fig. 5
Eine Skizze eines Verfahrensablaufs zu einem dritten Zeitpunkt C
The individual figures show:
Fig. 1
Cross section of a device for guiding a material web in normal operation
Fig. 2
Top view of a device for guiding a material web in normal operation
Fig. 3
A sketch of a procedure at a first time point A
Fig. 4
A sketch of a procedure at a second time B
Fig. 5
A sketch of a procedure at a third time point C

Fig. 1 zeigt die Vorderansicht und Fig. 2 die Seitenansicht entlang der Schnittes A-A einer erfindungsgemäßen Vorrichtung. Die Materialbahn 1 wird über eine Leitwalze 2 zu einer Breitstreckwalze 22, welche zum Strecken der Materialbahn 1 quer zur Transportrichtung z dient, geführt. Nach weiteren Leitwalzen 4 wird die Materialbahn 1 stromabwärts zu den ersten Längsschneidvorrichtungen 5a, 5b transportiert, die die Materialbahn 1 in einzelne Nutzen 1a, 1b, 1c und den Randbereich bzw. Randschnitt 1a', 1b' aufteilen. Fig. 1 shows the front view and Fig. 2 the side view along the section AA of a device according to the invention. The material web 1 is guided via a guide roller 2 to a spreader roller 22, which serves for stretching the material web 1 transversely to the transport direction z. After further guide rollers 4, the material web 1 is transported downstream to the first longitudinal cutting devices 5a, 5b, which divide the material web 1 into individual advantages 1a, 1b, 1c and the edge region or edge section 1a ', 1b'.

Die Längsschneidvorrichtungen 5a, 5b sind auf einem Messerbalken 18 montiert und seitlich auf diesem verschiebbar. Die Längsschneidvorrichtungen 5a, 5b bestehen aus einem Halter, welcher jeweils zwei Klingenschieber aufnehmen kann, wobei die jeweilige untere Klinge die Materialbahn 1 schneidet. Gegebenenfalls kann die obere Klinge über eine einfache Schiebevorrichtung 8 die verschlissene untere Klinge im laufenden Betrieb ersetzen. Die seitliche Position der Längsschneidvorrichtungen 5a, 5b kann mittels Skaleneinheiten, die auf dem Messerbalken 18 angebracht sind, reproduzierbar eingestellt werden. Außerdem kann der Messerbalken 18 mit den Längsschneidvorrichtungen 5a, 5b zum leichteren Einziehen bzw. Einfädeln der Materialbahn 1 bei Produktionsbeginn pneumatisch durch den Zylinder 19 orthogonal zur Materialbahn 1 abgeschwenkt werden. Speziell bei dieser Vorrichtung ist gemeint, dass der Messerbalken mit einer Schwenkbewegung, die auch Komponenten in Richtung des Lots auf der Materialbahnoberfläche enthält (in Figur 3 y-Richtung) von der Materialbahn 1 abgeschwenkt wird. Alternativ zu einem Messerbalken könnte natürlich auch nur ein Messer oder mehrere Messer individuell in einer solchen Weise weggeschwenkt werden. Wichtig ist, dass die Bewegung oder die Bewegungen die Messer aus der Ebene der Bahn im Bereich des Schnitts fördern. Jede Längsschneidvorrichtung 5a, 5b ist mit einem federgelagerten Schutzblech zur Absicherung der Schneidklingen ausgestattet. Beim Abschwenken des Messerbalkens verschwinden die Schneidklingen innerhalb des Schutzblechs. Bei den Längsschneidvorrichtungen 5a, die den Randschnitt 1a', 1b' vornehmen, ist der Klingenschieber 8 zusätzlich mit einem Pneumatikzylinder 7 ausgestattet, mit dem die Klingen von der Materialbahn 1 weg bzw. zur Materialbahn 1 hin gefahren werden kann. Dabei wird das Hineinfahren der Klinge in die Materialbahn 1 im Folgenden mit "Aktivierung" und das Wegfahren mit "Deaktivierung" der Längsschneidvorrichtungen 5a bezeichnet. Angesteuert wird der Pneumatikzylinder 7 durch eine Steuervorrichtung, die zwei Sensoren 3a, 3b umfasst, die oberhalb der Längsschneidvorrichtungen 5a montiert sind. Dabei handelt es sich beispielsweise um optische Sensoren z.B. Infrarotsensoren. Aber auch Tastsensoren sind hier denkbar. Diese Sensoren 3a, 3b detektieren, ob die Breite des Randstreifens 21 größer ist, als der Abstand zwischen Sensor 3a und 3b.The longitudinal cutting devices 5a, 5b are mounted on a cutter bar 18 and laterally displaceable on this. The longitudinal cutting devices 5a, 5b consist of a holder, which can each accommodate two blade pushers, the respective lower blade cutting the material web 1. Optionally, the upper blade can be replaced by a simple pusher 8, the worn lower blade during operation. The lateral position of the longitudinal cutting devices 5a, 5b can be reproducibly adjusted by means of scale units which are mounted on the cutter bar 18. In addition, the knife bar 18 can be pivoted with the longitudinal cutting devices 5a, 5b for easier feeding or threading of the material web 1 at the start of production pneumatically through the cylinder 19 orthogonal to the material web 1. Specifically, in this device, it is meant that the cutter bar includes a pivoting motion that also includes components in the direction of the solder on the web surface (in FIG FIG. 3 y-direction) is pivoted away from the material web 1. As an alternative to a knife bar, of course, only one knife or several knives could be individually swung away in such a way. It is important that the movement or movements encourage the knives out of the plane of the web in the area of the cut. Each longitudinal cutting device 5a, 5b is provided with a spring-loaded fender for Secured protection of the cutting blades. When swinging the knife bar, the cutting blades disappear inside the mudguard. In the longitudinal cutting devices 5a, which make the edge section 1a ', 1b', the blade slider 8 is additionally equipped with a pneumatic cylinder 7, with which the blades can be moved away from the material web 1 or toward the material web 1. In this case, the driving in of the blade into the material web 1 is referred to below as "activation" and the driving away with "deactivation" of the longitudinal cutting devices 5a. The pneumatic cylinder 7 is controlled by a control device comprising two sensors 3a, 3b, which are mounted above the longitudinal cutting devices 5a. These are, for example, optical sensors, for example infrared sensors. But tactile sensors are also conceivable here. These sensors 3a, 3b detect whether the width of the edge strip 21 is greater than the distance between sensor 3a and 3b.

Zur Verminderung des Kantenaufbaus an den Stirnflächen der Materialbahnrolle 23 ist eine Querchangierung 21 des Messerbalkens 18 angebracht. Zur Erhöhung der Klingenstandzeit bzw. -Einsatzzeit sind die Längsschneidvorrichtungen 5a, 5b mit einer Längschangierung 20 ausgestattet, damit die Materialbahn 1 nicht immer auf derselben Position der Klinge geführt wird. Außerdem sind die Klingen der Längsschneidvorrichtungen 5a, 5b mit einer Heizvorrichtung ausgestattet, da Tests gezeigt haben, dass beheizte Klingen eine bessere Schnittqualität ergeben.To reduce the edge structure at the end faces of the material web roll 23, a transverse pivoting 21 of the cutter bar 18 is attached. To increase the blade life or use time, the longitudinal cutting devices 5a, 5b equipped with a Längschangierung 20 so that the material web 1 is not always performed on the same position of the blade. In addition, the blades of the slitter 5 a, 5 b are equipped with a heater, since tests have shown that heated blades give a better cut quality.

Unterhalb der Längsschneidvorrichtungen 5a, 5b beginnt der Aufteilbereich der Nutzen 1a, 1b, 1c der Materialbahn 1. Diese Baugruppe besteht aus zwei Platten 15, die über Traversen miteinander verbunden sind und ist drehbar um die Achse 13 zum Seitengestell 25 der Vorrichtung gelagert.Below the longitudinal cutting devices 5a, 5b, the dividing region of the benefits 1a, 1b, 1c of the material web 1 begins. This assembly consists of two plates 15, which are connected to one another via cross members, and is mounted rotatably about the axis 13 to the lateral frame 25 of the device.

Mit dem Pneumatikzylinder 16 kann die gummierte Vorzugwalze 9, die zwischen den Platten 15 gelagert ist, gegen die untere Leitwalze 4 gedrückt werden. Unterhalb der gummierten Vorzugswalze 9 und zwischen den beiden Platten 15 sind zwei seitlich verschiebbare Abführvorrichtungen 11 für die Randstreifen 1a', 1b' angeordnet. Dabei kann es sich um Absaugtrichter, aber auch um rein mechanische Abgreifvorrichtungen handeln. Die seitliche Positionierung der Abführvorrichtungen 11 kann über eine Skalentafel erfolgen.With the pneumatic cylinder 16, the rubberized preferred roller 9, which is mounted between the plates 15, are pressed against the lower guide roller 4. Below the rubberized feed roller 9 and between the two plates 15, two laterally displaceable discharge devices 11 for the edge strips 1a ', 1b' are arranged. This can be suction funnels, but also purely mechanical pick-off devices. The lateral positioning of the discharge devices 11 can be done via a scale.

An der hier beschriebenen Abführvorrichtung 11 sind ein Absaugschlauch 14 und ein hier nicht gezeigtes zugehöriges Absauggebläse montiert. An der oberen Öffnung der Abführvorrichtung 11 ist eine Querschneidevorrichtung 10 beweglich gelagert. Das Messer der Querschneidevorrichtung 10 kann über einen Pneumatikzylinder 12 in Richtung der Materialbahn 1 bewegt werden. Die Materialbahn 1 läuft anschließend über eine weitere Leitwalze, zu einer Breitstreckwalze 17, über Kühlwalzen 24 und einer Kontaktwalze zum Materialbahnwickel 23.At the discharge device 11 described here, a suction hose 14 and a not shown here associated exhaust fan are mounted. At the upper opening of the discharge device 11, a cross-cutting device 10 is movably mounted. The knife of the cross-cutting device 10 can be moved via a pneumatic cylinder 12 in the direction of the material web 1. The material web 1 then passes over a further guide roller, to a spreader roller 17, via cooling rollers 24 and a contact roller to the web winding 23rd

Durch Breitenschwankungen bzw. seitliches Verlaufen der Materialbahn 1 kann die Materialbahn 1 außerhalb des Bereichs der Längsschnitteinrichtungen 5a gelangen. Das Fehlen des Randbereichs 21 wird vom Sensor 3b erkannt, der ein Signal zu den Längsschnitteinrichtungen 5a sendet, so dass der Pneumatikzylinder 7 die Klinge mit dem unteren Klingenhalter 8 aus der Materialbahn 1 zieht. Jetzt wird kein Randstreifen 21 mehr von der Materialbahn 1 abgetrennt.By width variations or lateral running of the material web 1, the material web 1 can pass outside the region of the longitudinal cutting devices 5a. The absence of the edge region 21 is detected by the sensor 3b, which sends a signal to the longitudinal cutting means 5a, so that the pneumatic cylinder 7 pulls the blade with the lower blade holder 8 from the material web 1. Now no edge strip 21 is separated from the web 1 more.

Wenn jetzt die Materialbahn 1 wieder breiter wird, läuft diese 1 wieder in den Bereich der Längsschnitteinrichtungen 5a ein. Der Sensor 3a registriert das Einlaufen der Materialbahn 1 in den Randbereich. Ist der Randbereich groß genug, so dass ein Randstreifen 21 abgetrennt werden kann, so wird dies vom Sensor 3b registriert und von diesem 3b ein Signal zur Längsschnitteinrichtungen 5a gesendet. Daraufhin wird mit dem Pneumatikzylinder 7 die Klinge mit dem unteren Klingenhalter 8 zur Materialbahn 1 geführt und ein Längsschnitt durchgeführt. Der Randstreifen 21 ist aber noch mit dem Nutzen 1a, 1c verbunden und läuft nun zusammen mit diesem 1a, 1b, 1c weiter stromabwärts in Richtung des Wickels 23. Um den Randstreifen 21 vom Nutzen 1a, 1c zu trennen und in die Abführvorrichtung 11 einführen zu können, muss kurz nach Eintauchen der Klinge der Längsschnitteinrichtung 5a in die Materialbahn 1 ein Querschnitt des Randstreifens 21 durch die Querschnittvorrichtung 10 erfolgen. Hierzu wird der Querschneidvorrichtung 10 ein Signal von dessen Steuereinrichtung zugeführt, wobei dies zeitverzögert zum Eintritt der Klinge der Längsschnitteinrichtungen 5a in die Materialbahn 1 erfolgt. Das Querschneidemesser der Querschneidevorrichtung 10 wird mit dem Pneumatikzylinder 12 in Richtung der Materialbahn 1 bewegt. Durch die Klinge des Querschneidemessers wird der Randstreifen 21 in seiner Bewegung stromabwärts abgebremst. Durch die Nachförderung des Randstreifens 21, durch den NIP (Walzenspalt der unteren Walze 4 und gummierter Vorzugwalze 9), entsteht eine Randschleifenschlaufe 26, die sich in die unter der Materialbahn 21 befindliche Abführvorrichtung 11 legt. Gleichzeitig steigt die Zugspannung im Randstreifen 21 hinter der bremsenden Klinge der Querschneidvorrichtung 10, da die Vorzugwalzen 24 sowie der Wickel 23 am Randstreifen 21 ziehen. Die erhöhte Zugspannung im Randstreifen 21 in Kombination mit der Klinge der Querschneidvorrichtung 10 trennen den Randstreifen 21 ab. Das anliegende Vakuum in der Abführvorrichtung 11 saugt die Schleife 26 des Randstreifens 21 an und fördert ihn 21 in die Entsorgung.If now the material web 1 becomes wider again, this 1 again enters the region of the longitudinal cutting devices 5a. The sensor 3a registers the shrinkage of the material web 1 in the edge region. If the edge region is large enough so that an edge strip 21 can be cut off, this is registered by the sensor 3b and a signal from this 3b is sent to the longitudinal cutting devices 5a. Then, the blade with the lower blade holder 8 is guided to the material web 1 with the pneumatic cylinder 7 and a longitudinal section performed. The edge strip 21 is still connected to the benefit 1a, 1c and now runs together with this 1a, 1b, 1c further downstream in the direction of the roll 23. To the edge strip 21 from the benefits 1a, 1c to separate and insert into the discharge device 11 can, shortly after immersion of the blade of the longitudinal cutting device 5a in the web 1, a cross section of the edge strip 21 by the cross-sectional device 10 done. For this purpose, the cross-cutting device 10 is supplied with a signal from the control device, which takes place with a time delay to the entry of the blade of the longitudinal cutting devices 5a in the web 1. The cross cutting blade of the cross cutting device 10 is connected to the pneumatic cylinder 12 in the direction of Material web 1 moves. By the blade of the cross-cutting blade of the edge strip 21 is slowed down in its movement downstream. By the Nachförderung of the edge strip 21, by the NIP (nip of the lower roller 4 and rubberized feed roller 9), an edge loop loop 26, which lays in the under the web 21 located discharge device 11 is formed. At the same time, the tension in the edge strip 21 behind the braking blade of the cross-cutting device 10 increases because the preferred rollers 24 and the winding 23 pull on the edge strip 21. The increased tensile stress in the edge strip 21 in combination with the blade of the cross-cutting device 10 separate the edge strip 21 from. The applied vacuum in the discharge device 11 sucks the loop 26 of the edge strip 21 and promotes him 21 in the disposal.

Die Figuren 3 bis 5 zeigen einen skizzierten Verfahrensablauf eines Ausführungsbeispiels eines erfindungsgemäßen Verfahrens zu drei unterschiedlichen Zeitpunkten. In Figur 1 ist die Situation zu einem ersten Zeitpunkt A gezeigt. Die Messer 31 befinden sich in ihrer Schneidposition 35. Sie haben die Bahn 1 entlang der Schnittlinie 32 durchtrennt. Die Bahn wird in der von dem Pfeil angegebenen Richtung z bewegt. Demzufolge gibt die gestrichelte Linie 33 an, welchen Weg die Schnittlinie weiter nimmt, wenn die Messer 31 in ihrer Schneidposition verbleiben, wenn die Bahn weiter bewegt wird. In Figur 3 ist auch noch der Sensor 29 zu sehen. Er ist den Schneidmessern 31 entgegen der Bahnlaufrichtung vorgelagert. Schon in Figur 3 ist daher absehbar, dass der Bereich schmalerer Bahn 34 erst den Sensor 29 und dann erst die Position 35 der Messer 31 erreicht.The FIGS. 3 to 5 show a sketched procedure of an embodiment of a method according to the invention at three different times. In FIG. 1 the situation is shown at a first time point A. The blades 31 are in their cutting position 35. They have severed the web 1 along the cutting line 32. The web is moved in the direction z indicated by the arrow. Accordingly, the dashed line 33 indicates which path the cutting line continues to take when the blades 31 remain in their cutting position as the web is moved further. In FIG. 3 is also the sensor 29 to see. He is the cutting blades 31 upstream of the web running direction. Already in FIG. 3 Therefore, it can be foreseen that the area of narrower web 34 first reaches sensor 29 and then only position 35 of blades 31.

Dieser Zustand ist zum Zeitpunkt B eingetreten. Figur 4 zeigt die Situation, die sich zu diesem zweiten Zeitpunkt ergibt. Der schmälere Bahnabschnitt 34 hat bereits den Sensor 29 erreicht. Dieser hat einen nicht gezeigten Aktor aktiviert, der die Messer 31 aus ihrer Schneidposition herauszieht. Dieser Umstand wird in Figur 4 durch die gepunkteten Linien 30 symbolisiert, die das aus der Bahn auftauchende Messer darstellen. Dieser "Auftauchvorgang" kann so schnell vor sich gehen, dass ein Teil der in Figur 4 gestrichelten Linie 30 nicht mehr durchtrennt wird. In diesem Fall könnte es jedoch Komplikationen geben, da die Randstreifen 21 dann an der Bahn hängen bleiben und nicht zur Gänze abgetrennt werden. Wenn die Randstreifen 21 einer Abführvorrichtung 11 zugeführt werden, wie sie in den Figuren 1 und 2 gezeigt ist, kann dies unter anderem zum Abriss der Randstreifen 21 und damit zur Beschädigung der Bahnränder führen. Daher erscheint es vorteilhaft, das Messer beziehungsweise die Messer 31 so lange in einer schneidaktiven Position 35 zu belassen, bis sie 31 tatsächlich die Engstelle der Bahn 1 erreichen und den oder die Randstreifen 21 vollständig abtrennen.This condition has occurred at time B. FIG. 4 shows the situation that arises at this second time. The narrower web section 34 has already reached the sensor 29. This has activated an actuator, not shown, which pulls the blades 31 from its cutting position. This circumstance will be in FIG. 4 symbolized by the dotted lines 30, which represent the emerging from the web knives. This "emergence process" can happen so quickly that part of the in FIG. 4 dashed line 30 is no longer severed. In this case, however, there could be complications, since the edge strips 21 then hang on the web and are not completely separated. If the edge strips 21 of a discharge 11th be fed as they are in the FIGS. 1 and 2 shown, this may lead, inter alia, to the demolition of the edge strips 21 and thus damage to the web edges. Therefore, it seems advantageous to leave the knife or blades 31 in a cutting-active position 35 until they actually reach the constriction of the web 1 and completely separate the edge strip or strips 21.

Auch beim Wiederbeginn des Schneidvorganges ist die zeitliche Abfolge, in der die Aktoren, die die Messerposition steuern, angesteuert werden, wichtig. Wenn die Messer 31 in der schneidaktiven Position sind, wenn die breiter werdende Bahn 1 wieder den Wirkbereich der Messer kommt (in x Richtung quer zur Transportrichtung der Bahn z) kann es dazu kommen, dass die Bahn 1 vom Messer 31 weg nach Innen gedrückt wird, kein Randbeschnitt stattfindet und es zur Bildung von Falten beim Aufwickeln der solcherart gestauchten Bahn 1 kommt.Even when the cutting process starts again, the chronological sequence in which the actuators that control the knife position are controlled is important. If the blades 31 are in the cutting-active position, when the widening web 1 again comes to the effective range of the knives (in the x-direction transverse to the transport direction of the web z), it is possible that the web 1 is pressed away from the knife 31 inward , no edge trimming takes place and there is the formation of wrinkles when winding the thus compressed web 1.

Einer solchen Entwicklung könnte jedoch vorgebeugt werden, indem der Anstellwinkel der Messer in der Ebene der Bahn 1 bei Beginn des Schnittes anders ist als während des normalen Schnittbetriebes.However, such a development could be prevented by the angle of attack of the knife in the plane of the web 1 at the beginning of the cut is different than during normal cutting operation.

Eine weitere sehr vorteilhafte Möglichkeit besteht darin, die Messer 31 erst dann wieder in Schnittposition zu bringen (am Besten durch eine Bewegung, die zumindest Komponenten in Richtung des Lotes auf die Ebene der Bahn 1 enthält, Raumrichtung y), wenn breitere Stellen der Bahn bereits das oder die Messer 31 (zumindest ein Messer oder Schneidmittel wird man brauchen) passiert haben. Wenn in dieser Weise verfahren wird, ergibt sich zum Zeitpunkt des Einschneidens in die Bahn die in Figur 5 dargestellte Situation:
Die Randstreifen 21 bleiben zunächst über Bahnmaterial, das sich zwischen der Eintauchstelle 35 der Messer 31 und dem Zentrum des Bereichs schmalerer Folienbahn befindet, verbunden. Nach dem Eintauchen der Messer in die Bahn trennen diese wieder die Bahn 1 von den Randstreifen 21, was durch die Linie 32 im unteren Bereich der Figur 5 dargestellt ist.Another very advantageous possibility is to bring the knives 31 back into cutting position (best by a movement that contains at least components in the direction of the solder on the plane of the web 1, spatial direction y), if wider locations of the web already the one or more knives 31 (at least one knife or cutting means will be needed) will have passed. When proceeding in this way, at the time of cutting into the web, the in FIG. 5 illustrated situation:
The edge strips 21 initially remain connected via web material which is located between the dipping point 35 of the knives 31 and the center of the area of narrower foil web. After dipping the knives in the web, they separate again the web 1 from the edge strips 21, which is indicated by the line 32 in the lower part of the FIG. 5 is shown.

Die zu letzt diskutierte Vorgehensweise hat den Nachteil, dass der lediglich teilweise abgetrennte Randstreifen 21 zunächst nicht von der Abführvorrichtung 11 einer adäquaten Weiterverwertung zugeführt werden kann, da das vorauseilende Ende der oder des Randstreifens 21 ja noch an der Bahn 1 hängt. Allerdings wird durch das Mitführen der oder des Randstreifens eben auch verhindert, dass dieser lose an sich drehenden Bauteilen vorbeigeführt wird und eine Blockade der ganzen Maschine herbeiführt, indem er 21 sich zum Beispiel um drehende Wellen der Vorrichtung wickelt. Daher kann es vorteilhaft sein, einen Querschnitt durch den Randstreifen 21, der diesen 21 endgültig von der Bahn 1 trennt, zu einem relativ späten Zeitpunkt, da schon eine vorbestimmte Bahnlänge teilweise abgetrennten Randstreifens 21 die Querschneideinrichtung 10 passiert hat, vorzunehmen. Unmittelbar nach oder bereits vor diesem Querschnitt sollte die Abführvorrichtung 11 in einer Weise aktiviert sein, die es ihr 11 gestattet, das nach dem Quertrennschnitt nun lose vorauseilende Ende eines Randstreifens 21 zu arretieren.The last discussed approach has the disadvantage that the only partially separated edge strip 21 initially can not be supplied by the discharge device 11 of an adequate recycling, since the leading end of the or the edge strip 21 still depends on the web 1. However, by the entrainment of the or the edge strip just also prevents these loosely rotating components from passing and causing a blockage of the whole machine by, for example, winding around rotating shafts of the device. Therefore, it may be advantageous to make a cross-section through the edge strip 21 which finally separates this 21 from the web 1 at a relatively late time, since a predetermined length of web of partially separated edge strip 21 has already passed through the cross-cutter 10. Immediately after or even before this cross-section, the discharge device 11 should be activated in a manner which allows it 11 to lock the now loosely leading end of an edge strip 21 after the cross cutting cut.

Das Ergebnis des zuletzt beschriebenen Vorgehens besteht darin, dass der Anfang des nach einem Bereich schmalerer Folie teilweise abgetrennten Randstreifens 31 zunächst einer weiteren Verarbeitung zugeführt wird, indem er der Bahn 1 folgt. In der Regel wird die weitere Verarbeitung zunächst in einem Aufwickeln auf einem Bahnwickel 23 bestehen. In der Folge wird der Randstreifen 21 durch einen Quertrennschnitt durchtrennt und das vorauseilende Ende des durchtrennten Randstreifens 21 wird von einer Abführvorrichtung 11 aufgenommen.The result of the procedure described last is that the beginning of the edge strip 31, which is partially separated after a region of narrower film, is first fed to further processing by following the web 1. As a rule, further processing will initially consist of winding on a web winding 23. As a result, the edge strip 21 is severed by a cross cutting cut and the leading end of the severed edge strip 21 is received by a discharge device 11.

Ein Bestreben kann darin bestehen, die Länge des Teils des Randstreifens, der mit auf dem Wickel aufgewickelt wird, klein zu halten, den Quertrennschnitt also direkt am Beginn oder kurz nach dem Beginn des Randstreifens durchzuführen. Zu der technischen Ausführung der oben dargestellten Verfahren sind folgende Mittel vorteilhaft einsetzbar:
Eine Steuervorrichtung/Computer, die zumindest mit einem Teil der oben erwähnten Maschinenkomponenten in Verbindung steht und zur Ausführung des Verfahrens eingestellt ist. Dies wird oft computerimplementiert vorzugsweise mit einem Programm geschehen.One endeavor can be to keep the length of the part of the marginal strip, which is wound with on the winding, small, so that the cross cutting cut is made directly at the beginning or shortly after the beginning of the marginal strip. The following means can advantageously be used for the technical implementation of the methods presented above:
A controller / computer communicating with at least a portion of the aforementioned machine components and configured to perform the method. This is often computer-implemented, preferably done with a program.

Das betreffende Computerprogramm oder geeignete Datensequenzen können einer Steuervorrichtung/Computer auf einem Datenträger oder als Datenstrom (z. B. per E-Mail) zugänglich gemacht werden.The relevant computer program or suitable data sequences can be made available to a control device / computer on a data medium or as a data stream (eg by e-mail).

Zur Ausführung der oben skizzierten Verfahren sind Messer- beziehungsweise Messeraktoren vorteilhaft, die die Messer aus der Bahnebene hinaus bewegen. Gut ist hierbei eine Bewegung, die zumindest eine Komponente enthält, die orthogonal zur Ebene der Bahn im Schnittbereich verläuft (y-Richtung). Dies kann eine Schwenkbewegung sein. Es ist jedoch auch eine Translation denkbar. Diese kann auch genau orthogonal zur Bahnebene verlaufen. Die Abführvorrichtung kann vorteilhafterweise mit einer Absaugvorrichtung ausgestattet sein, so dass sie abzuführende Folie ansaugt. Einige (zumindest einer), wenn nicht alle Längs- und Querschneidevorgänge und die zugehörigen Messerbewegungen sollten fliegend, das heißt bei laufender Maschine durchgeführt werden können. Bezugszeichenliste 1 Materialbahn 2 Leitwalze 3 Sensoren 4 Leitwalze 5 Längsschneidevorrichtung 6 Klingenschieber 7 Pneumatikzylinder 8 Klingenschieber 9 Vorzugwalze 10 Querschneidevorrichtung 11 Abführvorrichtung 12 Pneumatikzylinder 13 Achse 14 Absaugschlauch 15 Platten 16 Pneumatikzylinder 17 Breitstreckwalze 18 Vorzugwalzen 19 Zylinder 20 Längschangierung 21 Randstreifen 22 Breitstreckwalze 23 Wickel 24 Kühlwalzen 25 Seitengestell 26 Randschleifenschlaufe z Bahnlaufrichtung/Pfeil in Bahnlaufrichtung 29 Sensor 30 Aus der Bahn "auftauchendes" Messer 31 Messer in Schneidposition 32 Schnittlinie 33 Gestrichelte Linie in der Fortsetzung der Schnittlinie 32 34 Bereich schmalerer Folie/Bereich einer Breitenschwankung 35 Eintauchstelle / Arbeitsstellung 35 der Messer 31 A,B,C Zeitpunkte im Verfahrensablauf x Raumrichtung in der Ebene der Bahn, orthogonal zur Laufrichtung z y Raumrichtung lotrecht zur Ebene der Bahn im Wirkbereich des Messers z Laufrichtung der Bahn Knife or knife actuators which move the knives out of the web plane are advantageous for carrying out the methods outlined above. Good here is a movement that contains at least one component which is orthogonal to the plane of the web in the cutting area (y-direction). This can be a pivoting movement. However, a translation is also conceivable. This can also be exactly orthogonal to the orbital plane. The discharge device can advantageously be equipped with a suction device, so that it sucks the film to be discharged. Some (at least one), if not all, longitudinal and transverse cutting operations and the associated blade movements should be able to be done on-the-fly, that is, while the machine is running. LIST OF REFERENCE NUMBERS 1 web 2 guide roll 3 sensors 4 guide roll 5 Slitter 6 blade push 7 pneumatic cylinder 8th blade push 9 advancement roller 10 Cross-cutting device 11 discharge device 12 pneumatic cylinder 13 axis 14 suction hose 15 plates 16 pneumatic cylinder 17 Spreader roll 18 feed rollers 19 cylinder 20 Längschangierung 21 edge strips 22 Spreader roll 23 reel 24 chill rolls 25 side frame 26 Edge loop loop z Web direction / arrow in web direction 29 sensor 30 From the train "emerging" knife 31 Knife in cutting position 32 intersection 33 Dashed line in the continuation of section line 32 34 Area of narrower film / range of width variation 35 Immersion point / working position 35 of the knives 31 ABC Timing in the procedure x Direction of space in the plane of the web, orthogonal to the direction z y Direction of space perpendicular to the plane of the web in the effective range of the knife z Direction of the train

Claims (19)

  1. A device for guiding a material web (1), which device has at least one longitudinal cutting means (5a, 5b) for adjusting the width of the material web (1), with which device the web (1) can be separated along its direction of movement (z) into at least one main film web (1a, 1b, 1c) and at least one edge strip (1a', 1b'), comprising
    • at least one sensor, with which sensor (3a, 3b) measured values can be recorded, from which measured values the width of the web (1) can be determined,
    • at least one actuating device for the at least one longitudinal cutting means (5a, 5b), with which actuating device the longitudinal cutting means (5a, 5b) can be activated and deactivated,
    which longitudinal cutting means (5a, 5b) can be controlled on the basis of signals of the at least one sensor,
    characterized by
    at least one transverse cutting device (10) for the severing of an edge strip (1a', 1b'), which transverse cutting device can be activated by a control device,
    wherein the transverse cutting device (10) is mounted further downstream than the longitudinal cutting means (5a, 5b) and
    wherein the control device is configured to calculate the time difference in which the cutter of the transverse cutting device (10) must enter the material web, in order to carry out the transverse cut, when the beginning of a longitudinal cut has arrived at the transverse cut location.
  2. The device according to the preceding claim,
    characterized in that
    the material web (1) can be broken down by means of a longitudinal cutting device (5a, 5b) into at least two partial webs (1a, 1 a', 1b, 1b', 1c), wherein at least one partial web (1 a, 1a', 1b, 1b', 1c) consists of an edge region (21) of the material web (1).
  3. The device according to any one of the preceding claims,
    characterize by
    a control device, with which control device signals can be sent to the longitudinal cutting device (5a, 5b) for the activation or deactivation of the same (5a, 5b).
  4. The device according to any one of the three preceding claims,
    characterized in that
    the cutter of the transverse cutting device (10) can be moved in the direction of the material web (1) by means of a pneumatic cylinder (12).
  5. The device according to any one of the preceding claims,
    characterized in that
    at least one discharge device (11) is provided for removing at least one partial web (1a, 1a', 1b, 1b', 1c).
  6. The device according to the preceding claim,
    characterized in that
    the removal device (11) for removing a partial web (1a, 1a', 1b, 1b', 1c) comprises a fan, with which fan an air flow can be generated, which sucks the partial web.
  7. The device according to any one of the preceding claims,
    characterized by
    a feed roller (9), which is mounted in the web running direction between the longitudinal cutting device (5a, 5b) and the discharge device (11), with which feed roller at least two partial webs (1a, 1a', 1b, 1b', 1c) can be synchronously transported.
  8. The device according to Claim 7,
    characterized in that
    a feed roller (9) for feeding in the material web (1) when commencing production can be pivoted away orthogonally to the material web (1).
  9. The device according to any one of the preceding claims,
    characterized in that
    at least one longitudinal cutting device (5a, 5b), which is preferably mounted on a cutter bar (18), can be pivoted away orthogonally to the material web (1) for feeding in the material web (1) when commencing production.
  10. The device according to Claim 9,
    characterized in that
    the longitudinal cutting devices (5a, 5b) are mounted transversely displaceably on a cutter bar (18).
  11. The device according to any one of the preceding claims,
    characterized in that
    the blades of the longitudinal cutting device (5a, 5b) are equipped with a heating device.
  12. A method for guiding a material web (1), which material web is subjected by an upstream production- or processing process to width fluctuations, in which at least one longitudinal cutting means (5a, 5b) is used for adjusting the width of the material web (1), with which longitudinal cutting means the web (1) is separated along its direction of movement (z) into at least one main film web (1a, 1b, 1c) and at least one edge strip (1a', 1b'),
    - wherein measured values are recorded by at least one sensor, from which it is determined whether web material is located in the operating area of the at least one longitudinal cutting means (5a, 5b), and
    - wherein the longitudinal cutting device (5a, 5b) is deactivated, if, as a result of a reduction of the width of the web, no web material is in the cutting area of the at least one longitudinal cutting means (5a, 5b)
    characterized in
    • that at least one transverse cutting device (10) is activated by a control device for severing an edge strip (1a', 1b'),
    wherein the transverse cutting device (10) is mounted further downstream than the longitudinal cutting means (5a, 5b) and
    wherein the control device calculates the time difference, in which time difference the cutter of the transverse cutting device (10) must enter the material web, in order to carry out the transverse cut, when the beginning of the longitudinal cut has arrived at the transverse cut location.
  13. The method according to the preceding claim,
    characterized in
    that when web material enters the region of the longitudinal cutting device (5a, 5b) again the latter (5a, 5b) is reactivated.
  14. The method according to the preceding claims 12 to 13,
    characterized in that
    the edge strip (21) is braked by the cutter of the transverse cutting device (10), wherein the edge strip (21) is further transported by a feed roller (9), so that an edge loop (26) is created, which is sucked by the discharge device (11).
  15. The method according to the preceding clams 12 to 14,
    characterized in that
    due to the braking of the edge strip (21) by the cutter of the transverse cutting device (10) and simultaneous increase in the tension by the feed roller (24) of the edge strip (21) the edge strip (21) is separated further downstream from the material web (1).
  16. The method according to any one of the preceding claims 12 to 15,
    characterized in that
    an optical sensor is used, which measures the intensity of the light beam, which returns to a light source, which is located on the same side of the material web (1), as the optical sensor.
  17. The method according to the preceding claim,
    characterized in that
    the light beam is directed to the material web (1), if material of the material web is located in the operating area of the at least one longitudinal cutting device (5a, 5b).
  18. The method according to the preceding claim,
    characterized in that
    the light beam strikes a mirror, if no material of the material web is located in the operating area of the at least one longitudinal cutting device (5a, 5b) and that the mirror directs light of the light beam back to the sensor device.
  19. The method according to any one of the preceding Claims 12 to 18,
    characterized in that
    - the longitudinal cutting device (5a, 5b) used for the longitudinal cutting of the web (1) - or for severing an edge strip 21 - contains at least one cutter (31),
    - and that this at least one cutter (31) carries out a movement - preferably a pivot movement - at least during a movement into its cutting position (35) or out of its cutting position (35)
    - which has at least one component parallel to a perpendicular to the plane of the web (1) in the area of the cutting position (35).
EP08828979.8A 2007-09-05 2008-09-05 Device and method for guiding a material web Active EP2200788B1 (en)

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DE102007042025.2A DE102007042025B4 (en) 2007-09-05 2007-09-05 Device and method for guiding a material web
PCT/EP2008/007281 WO2009030491A1 (en) 2007-09-05 2008-09-05 Device and method for guiding a material web

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110919532A (en) * 2019-12-02 2020-03-27 霍修沛 Improved wire drawing wheel for metal material wire drawing treatment
CN110919532B (en) * 2019-12-02 2021-07-09 顾建伟 Improved wire drawing wheel for metal material wire drawing treatment

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EP2200788A1 (en) 2010-06-30
WO2009030491A1 (en) 2009-03-12
DE102007042025B4 (en) 2018-12-20
DE102007042025A1 (en) 2009-03-26

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