EP1307393B1 - Method and device for cutting through a running web of material and for fixing the start of the following web section on a core - Google Patents

Abstract

For the winding of a material web on a driven winding roll, it is cut through after the completed winding of a winding roll and the start of the following web is fastened on a winding core. The web is fed in the winding roll via a guide device, preferably consisting of a winding roller, and, after being cut through in a guide channel laid around a winding tube. In order to be able to wind the web with alternating outer sides into a winding roll, the web is fed, according to the desired outer side, from the left or from the right on winding in the winding tube. The winding tube is driven with a corresponding one of two opposite directions of rotation.

Description

The invention relates to a method for severing a current to a driven winding roll web and for determining the trailing web start on a winding core or a winding tube according to the preamble of claim 1 and an apparatus for performing this method.

Continuously produced material webs, for example flat-lay tubular webs or single-layer webs made of thermoplastic material produced in a blown film line, must be wound up into reel rolls for storage and handling. Here, each running to a winding roll web must be severed after the finish winding a winding roll and the web start of the trailing path to Anwickeln on a winding core or a winding tube to be able to continue the winding process without disturbing or redirecting the continuously fed web.

A winding method, a web separation device and a web winder are already known in principle from WO 99/06313 A. DE-B-1 274 853 is also concerned with a winding device for webs, preferably for high-speed paper webs.

It is known to wind the beginning of a web to be wound up into a winding roll onto a winding tube, which is provided with an adhesive application for defining the web beginning.

In order to avoid this applied with an additional effort adhesive application, devices for glueless winding of webs on cores are known. A known device for glueless Anwickeln a web start on a winding core or a winding tube consists of an attached to a provided with suction holes in their jacket feed roll Wikkelhülse on which after the severing of the web of the web formed thereby web wound is wound by the fact that in the nip between the Feed roller and the winding tube, a suction box is retracted, which is provided at an extended edge with a web-cutting knife and then to the knife with a schalenfönnig curved wall which forms a cup-shaped curved channel with a portion of the circumference of the winding tube, at the front End is sucked in the manner in the area of the nip through the suction box air in such a way that the web start is sucked into the guide channel, and is determined by the winding tube, that the web start in the gap between the feed roller and the winding tube einl In which he is covered by the trailing path, so that the web start is set after a turn on the winding tube.

A particular problem with the winding of winding cores or cores with a web start, however, is that the webs to be wound up into reels are asymmetrical, which means that they have sides with different properties. Depending on the further processing of wound up to winding rolls webs, it is therefore desirable that one or the other side on the winding roll lies outside. To be able to produce bobbins on which the webs with changing outer sides, so once wound up with one and the other with the other outer side, it is necessary to drive the feed roller and the winding core or the winding tube with opposite directions of rotation what it makes it necessary to supply the web beginning of the winding tube formed by separation of the web depending on the direction of rotation from opposite directions of the feed roller. Such a supply of the web start to the winding tube from opposite directions is not possible in the known device.

The object of the invention is therefore to provide a method of the type described above, which makes it possible to supply the web start of a wound up to a winding roll web to a winding core or a winding tube in the manner depending on the direction of rotation approximately tangentially that the web optionally with the one or the other side can be wound outboard to a winding roll.

According to the invention, this object is achieved in a method of the type specified by the features of claim 1.

A first apparatus for carrying out the method according to claim 1 comprising a guide means guiding the web to the winding roll, with a knife severing the web and means for redirecting the web start from the guide means to the driven winding tube and having a guide channel for laying the web around the web Winding sleeve is characterized according to the invention characterized in that the guide means for winding the web with changing outer sides of the winding tube and the winding tube or the winding core are mutually driven opposite Födereinrichtungen. According to this first embodiment of the device according to the invention, it is therefore only necessary to supply the web with the one or the other side outboard of the guide device, preferably a feed roller, by reversing the conveying or rotating direction, so that the web with one or the other Side outboard is wound on the winding core or the winding tube. In this case, the Wikkelkem or the winding tube is to be provided in both directions of rotation, starting from the point of introduction of the web beginning with guide channels, which lay around the web start in the manner around the winding core or the winding tube, that it is determined after a turn from the incoming overlapping track.

According to a preferred embodiment, it is provided that the guide device consists of a driven suction roll with a detachable from a axially extending gap of the shell separating knife and both sides of the gap of pivotally mounted Mantetschalen, which the dug from the envelope cylinder web start depending on the direction of the web left or Start right around in the guide channel. So to be able to wind a web with the desired side au-ßenliegend to a winding roll, it is only necessary to give up the web with the desired side on the suction roll and then wrap the web with left or right turn on the winding core or the winding tube and then finish.

According to a further development of the invention it is provided that the winding tube is concentrically and surrounded by the formation of the existing of its annulus guide channel of a cylindrical housing which is provided with an axial inlet gap for the web start

Conveniently, the cylindrical housing consists of two pivotally mounted housing shells, which release the winding tube in the swung-out state. In this way, the winding tube can be easily inserted into the cylindrical housing and release it again.

The winding tube itself is provided in a known manner with a drive so that it rotates at the same peripheral speed as the feed roller.

According to a further preferred embodiment, is claimed for the device for redirecting the front end of a web independent protection, it is provided that the pivotable shell shells consist of a comb-like grate whose offset circumferentially towards the gap freely expiring finger in the swung-out state accordingly arranged fingers enforce, which form on both sides of the edge region of the inlet gap of the housing. The comb-like interspersing fingers of the front edges of the pivotable shell shells and the front edges of the cylindrical housing on both sides of the inlet gap lift the passage of the web start this from the feed roller and direct it into the existing of an annulus guide channel, so that the web start around the winding tube is passed around until it is covered by the trailing path and clamped.

According to a further preferred embodiment, it is provided that for displacing the inlet gap, the housing is pivotally mounted about the central axis of the winding tube. By appropriate pivoting of the housing, one or the other of the inlet gap of the housing bounding edge, which is preferably formed by rust-like fingers, are aligned to the feed roller or each of this swung-out mantle shell, that lifted the web start from the feed roller and for wrapping the winding tube is introduced into the surrounding guide channel.

Conveniently, a pivot drive is provided for the housing shells, by which they are pivotable between their open and their closed position. The pivot drive may consist of with their one ends hinged to the housing shells links at the hinged interconnected other end, a pneumatic cylinder is articulated

In order to improve the installation of the web start in the guide channel to the Gehülse around, each of the housing shells may be provided at a suitable location with suction nozzles. The air sucked in by the suction nozzles promotes the laying around of the web beginning around the winding tube and the entrance of the web start into the gusset formed by the trailing path therewith.

According to another embodiment, it is provided that the housing shells are provided with blowing air nozzles which are approximately tangential in the direction of the supplied At the beginning of the blowing process, blow blowing air into the guide channel and guide the leading end of the sheet stretched around the winding sleeve until it is clamped by the covering web. The blast air avoids problems that may arise in the suction air in that the web is stopped at the suction nozzles.

The outer shell pivoting out of the feed cylinder drives can consist of pneumatic cylinders.

According to an inventive development, for which as a device for separating a running web by a transverse section independent protection is claimed, it is provided that the knife consists of individual at equal intervals attached to a knife bar knives and that the cutter bar in axial guides of the roller is guided so that it extends radially out of the blades, moves in the axial direction and retracts radially. To ensure a clean cut, while the axial movement of the knife in its extended state must be at least as large as the mutual distance of the knife.

Conveniently, the cutter bar is provided in the region of its ends with roller pairs which run in trapezoidal guides of the feed roller.

If, however, the blades are guided parallel to the axis of the knife cylinder during the cutting cut, disruptions in the cut may occur if material accumulations are present in the web to be cut. Such accumulations of material can result in webs of plastic film, for example, from thick areas or the folded edges of gussets. In webs made of any material accumulations of material for the knife form as it were abutting edges, which hinder a clean execution of the cut. In order to perform a clean cut even if the knives when stacking the web encounter accumulations of material, the invention is provided in a further embodiment, that overlap the radial and axial movements of the knife each other. This overlay causes the blades during cutting a movement in the plane of the web to be cut and additionally one of these Exercise motion overlay motion that is perpendicular to the plane. So, as the knives make cutting movements in the plane of the web and across it, a clean cut is guaranteed even when the knives collide with accumulations of material.

The knife bar is expediently guided in curved guides, for example circular-arc-shaped guides, of the suction and knife cylinder.

According to another embodiment, it is provided that the cutter bar is mounted on provided with a rotary actuator parallel link, the knife pivot on a circular arc-shaped path.

In particular, the invention also relates to the winding of continuous webs of material, preferably film webs based on synthetic or semisynthetic polymers, on a series of cores by means of a winding device which has a winding roller, at least one guide roller and at least one separating device.

For continuous operation it is necessary that the replacement of the finished wound tubes by fresh tubes without interrupting the flow of often running at high speeds of a few hundred meters per minute web takes place. Such webs are z. B. of continuously operating Folienherstellungs- and / or film coating machines and must therefore be wound continuously on a series of Folienwickein. For this purpose, various systems are known, see, for. EP 0 017 277 (US 4 191 341), US 4 693 157 and EP 0 394 197 (US 4 852 820)

The winding of the empty tubes requires a secure connection of the sleeve with the front end of a new section of the web, which forms in transverse separation of the web together with the running on the full winding rear end of the preceding track section. This is not a trivial task and causes problems because the process is very quick and with great certainty must be done. For this purpose, various methods are known, for example, the application and adhesion of the film web to adhesive areas on the winding tube, tack-free electrostatic application and tack-free application by means of a compressed air stream.

The inventor has described in WO 9906313 a method and an apparatus in which the Anrolleln is achieved with a slot-shaped over the web width extending opening with an arcuate suction air flow, which causes the required contact of the front end of the new web section with the fresh winding tube and enables a tack-free connection of the film web with the winding tube.

However, this known device can not readily be used for winder in which a given web of material is either clockwise or counterclockwise, i. "bi-directional", can be performed on the winding roller. A winder that allows such bi-directional winding is particularly needed for the winding of film webs having on their two sides of a different nature, for. B. only one side or are coated differently on both sides. Depending on the nature of the use and / or further processing, the customers wish that one or the other side lies on the outer side of the film roll in the film winding.

A further object of the invention is therefore to specify a bi-directional winding method and a device suitable for carrying out this method, wherein the winding can also be accomplished with the suction air flow method known in principle from WO 9906313.

This object is achieved according to a further embodiment of the invention by a web winding method, ie by a method for winding a continuously moving web on a sequence of winding tubes by means of a winding device having a winding roller, at least one guide roller and at least one separating device; this is the case when operating the separator formed front end of the running material web wound by a suction air flow to the winding tube; for operation according to the invention of the Wikkelvorrichtung as a bi-directional winder for wrapping each winding tube a winding sleeve comprehensive this bell is used, which is formed by two elongated shells which are movably connected to close and open the bell; each of the shells has near its movable end a suction slot extending at least approximately over the length of the winding tube, and only one of the two suction slots, preferably the suction slot located downstream in the direction of rotation of the winding roller, is actuated for winding; the at least one separating device is arranged in the interior of the winding roller

Such, arranged in the interior of a winding roller separation device which allows a smooth and safe web separation even at high operating speeds of a few hundred meters per minute, typically in the range up to about 10 m / sec, is not known to the knowledge of the inventor.

Therefore, in a second embodiment, the invention relates to a web separation device, ie a separation device for use in a web winding device of the kind described above, wherein the separation device is disposed inside the winder roll at a working width extending slot of the winding roll shell and a plurality of each other in moving connection having acute separating elements, which are designed to effect the separation process by the jacket of the winding roller in the radial direction outwardly and at least approximately parallel to the axis of the winding roller in the axial direction, wherein the length of the movement of each separating element is selected in the axial direction in that the material web is severed transversely throughout. With such a separation device is a smooth and secure transverse separation of the web even at web speeds of up to about 10 m / sec or possibly even more possible.

Web dividers having a plurality of pointed dividers are known per se, e.g. from the above-mentioned US Pat. No. 4,852,820, however, do not effect the separation process by a two-dimensional movement but only by a radial movement. However, the design of the tips and cutting preferred separation elements described therein is also suitable for the present invention, which is why reference is made in this regard to the above-mentioned document.

According to a third embodiment, the invention relates to a web winder, ie a
Apparatus for winding a continuous web of material on a sequence of cores with a winding roller, at least one guide roller, at least one separating device and means for winding the front end of the moving web formed by the operation of the separator through a suction air flow on the winding tube; the according to the invention for bidirectional operation suitable winding device has a respective abzuwikkelnde winding tube comprehensive and formed by two elongated shells bell, each of the shells near their free, ie not connected to the other shell end, at least approximately over the length of the winding tube extending suction slot Has; the bell also has means to actuate one of the two suction slots, preferably the suction slot located downstream in each case in the direction of rotation of the winding roller, for winding, and the separating device lies in the interior of the winding roller.

The invention is in principle suitable for the continuous winding of webs of different materials, such as paper textile material and metal foils, but is used in particular in the course of the production and / or processing of endless films or tapes based on synthetic or semisynthetic polymers, such as the known continuous film webs based on cellulose and cellulose derivatives, polyalkylenes, polyesters, polyether, polyurethanes, polyamides and the like, in particular if these films have a different surface finish on both sides thereof.

Advantageously, the web of material is held in contact with the winding roll by a vacuum applied in the interior of the winding roll, the shell of which is perforated in a manner known per se, has a relatively non-slip surface and has e.g. can wear a rubber coating. The process of the invention can be operated at web speeds in a typical range of about 30-400 meters per minute or more. It is advantageous if the speed of the air flow at the respective actuated suction slot is at least twice and preferably at least three times higher than the running speed of the material web. Preferably, the suction air flow is thereby directed to flow around at least about 3/4 of the circumference of the winding tube (i.e., at least 270 °).

Furthermore, it is expedient if the material web is applied to the separating roller at least about half of the circumference of the winding roller at this, that is. at least approximately 180 ° of the winding roller. Optionally, the separator located inside the winding roller can lie in a chamber; which is completed against the interior of the winding roller, practically only via a corresponding slot and, if necessary, suitable Durchbrtechungen in the wall of the winding roller can be in communication with the ambient air. When initiating a web separation process, the chamber can be supplied with compressed air to at least cancel the adhesion of the web to the winding roller or to accelerate the web ends formed during the separation process in the radial direction to the outside.

The supply of the winding device with fresh cores from a magazine is state of the art, as well as the arrangement of the sleeves on a winding core and the transfer of the sleeves and cores from the magazine in the positions for coiling and finish winding. Conveniently, each of the Wikkelwalze fitting winding tube and the core carrying it is driven in a conventional manner and with known means centrally in one direction, which is opposite to the working direction of the winding roller.

The bell is connected to a source of negative pressure, also called "vacuum source", and to means of opening and closing. Suitable vacuum sources, e.g. Vacuum pumps, belong here as well to the state of the art, as the necessary means of movement and require no detailed description here. The applied negative pressure is typically in the range of about minus 250 to about minus 900 mbar.

The suction air flow generated in the interior of the bell under the effect of this negative pressure can furthermore be assisted in the manner known from the above-mentioned WO 9906313 by lateral inflows of ambient air. The shape of the bell forming shells according to the invention is generally designed so that an annular gap for the passage of the suction air flow is formed between the inner walls of the shells and the fresh winding tube. In general, the suction air flow in this gap has a flow velocity at the particular negative pressure that is typically at least twice as great as the running speed of the film web. When the suction slots are arranged at the end of this annular suction air channel, the front end resulting from web separation can be guided by the suction air flow over almost the entire circumference of the winding sleeve, preferably by at least about 270 ° of this circumference.

Fig. 1

eine Stimansicht einer schematisch dargestellten Vorrichtung zum kontinuierlichen Aufwickeln einer laufenden Materialbahn zu Wickelrollen, auf die die Bahn wahlweise mit der einen oder der anderen Seite außenliegend aufgewickelt wird, in einem Zustand, in dem eine Wickelrolle nahezu fertig gewickelt ist,

Fig. 2

die Vorrichtung nach Fig. 1, in der eine Wickelhülse mit angewickeltem Bahnanfang aus ihrer Anwickelstellung in ihre Stellung zum Fertigwickeln der Wickelrolle verfahren ist,

Fig. 3

einen Querschnitt durch den die Bahn zuführenden Saug- und Messerzylinder mit einer in ihrer Anwickelstellung befindlichen Wickelhülse in einem Zustand, in dem die über den Zylinder laufende Bahn mit einem Quertrennschnitt versehen ist,

Fig. 4

eine der Fig. 3 entsprechende Darstellung, in der eine ausschwenkbare Mantelschale den nachlaufenden Bahnanfang zur Einführung in den die Wickelhülse umgebenden Führungskanal ausgehoben hat,

Fig. 5

eine den Fig. 3 und 4 entsprechende Darstellung, in der der Bahnanfang in den die Wickelhülse umgebenden Führungskanal eingeführt ist,

Fig. 6

einen Längsschnitt durch den Saug- und Messerzylinder, aus der der die Messer tragende Messerbalken ersichtlich ist,

Fig. 7

einen vergrößerten Ausschnitt aus Fig. 6,

Fig. 8

einen Axialschnitt durch den Saug- und Messerzylinder mit Wickelhülse im ausgehobenen Zustand der Finger einer Messerschale nach Fig. 4 ,

Fig. 9

einen vergrößerten Ausschnitt aus Fig. 8,

Fig. 10

einen den Fig. 6 und 7 entsprechenden Längsschnitt durch den Saug- und Messerzylinder, der mit kreisbogenförmigen Führungen für Messerbalken versehen ist,

Fig. 11

einen der Fig. 10 entsprechenden Längsschnitt, bei dem der Messerbalken durch endseitige Parallellenker verschwenkbar ist,

Fig. 12

eine schematische Darstellung eines zweiten erfindungsgemäßen Wickelverfahrens mit einer erfindungsgemäßen Wickelvorrichtung in einer ersten Wickelrichtung, wobei sich die Anwickelglocke in Ruhestellung befindet und geöffnet ist,

Fig. 13

eine ähnliche Darstellung wie in Fig.12, jedoch bei Betrieb in einer zweiten Wickelrichtung, wobei sich die Anwickelglocke in Arbeitsstellung befindet und die Schalen um eine frische Wickelhülse geschlossen sind,

Fig. 14

die Anwickeiglocke in schematischer Darstellung mit geöffneten Schalen und

Fig. 15

die Anwickelglocke von Fig. 14 mit einer von den Schalen umschlossenen und an der Wickelwalze anliegenden frischen Wickehülse,
und

Fig. 16

die halbschematische Darstellung eines Beispiels einer erfindungsgemäßen Bahntrenntrenneinrichtung.

It is in itself possible to work with more than one bell for wrapping, but for reasons of constructive simplicity, the use of a single bell is generally preferred. The bell or each bell is normally movable between a rest position and a working position, which can be accomplished by means known per se. Furthermore, the movements required for carrying out the method according to the invention or for the operation of the device can be carried out in a manner known per se with conventional pneumatically, hydraulically or electrically operated movement means. This is within the skill of the art and needs no particular explanation here Embodiments of the invention are explained below with reference to the drawing. In this shows

Fig. 1

an end view of a schematically illustrated apparatus for continuously winding a moving web of material to wound rolls, on which the web is wound on either side of one or the other side outboard, in a state in which a winding roll is wound almost finished,

Fig. 2

1, in which a winding tube with a wound web start is moved from its Anwickelstellung into its position for the final winding of the winding roll,

Fig. 3

a cross section through the suction and knife cylinder supplying the web with a winding tube in its winding position in a state in which the web running over the cylinder is provided with a cross-cutting cut,

Fig. 4

3 shows a representation corresponding to FIG. 3, in which a swing-out jacket shell has dug the trailing edge of the web for introduction into the guide channel surrounding the winding tube,

Fig. 5

a representation corresponding to Figs. 3 and 4, in which the web start is introduced into the surrounding the winding tube guide channel,

Fig. 6

a longitudinal section through the suction and knife cylinder, from which the knife-carrying cutter bar is visible,

Fig. 7

an enlarged detail of FIG. 6,

Fig. 8

an axial section through the suction and knife cylinder with winding tube in the excavated state of the fingers of a knife shell of Fig. 4,

Fig. 9

an enlarged detail of FIG. 8,

Fig. 10

6 and 7 corresponding longitudinal section through the suction and knife cylinder, which is provided with circular arc-shaped guides for cutter bar,

Fig. 11

a longitudinal section corresponding to FIG. 10, in which the cutter bar can be swiveled by end-side parallel links,

Fig. 12

a schematic representation of a second winding method according to the invention with a winding device according to the invention in a first winding direction, wherein the Anwickelglocke is in the rest position and is open,

Fig. 13

12, but when operating in a second winding direction, wherein the Anwickelglocke is in the working position and the shells are closed by a fresh winding tube,

Fig. 14

the Anwicke bell in a schematic representation with opened trays and

Fig. 15

14 with an enclosed by the shells and applied to the winding roller fresh Wicking sleeve,
and

Fig. 16

the semi-schematic representation of an example of a web separation device according to the invention.

From Fig. 1 are end views of the suction and knife cylinder 1, located in its Anwickelstellung winding tube 2 and the almost finished wound roll 3 can be seen. The continuously fed material web 4 is fed to the suction and knife cylinder 1 via the deflection roller 5. It then runs approximately over half the circumference of the suction and knife cylinder 1 and is then wound up to the winding roll 3, wherein the winding core or the winding tube and the forming on this winding roll to be employed directly to the drive of the circumference of the suction and knife cylinder can. If the forming winding roll is driven directly by the suction and knife cylinder 1, it is a so-called contact winder. But the winding roll can also be formed by a so-called gap winder, in which the winding roll or its winding core or winding tube is provided with its own drive.

The stand of the winding roll 3, not shown, is guided via guides 6 on frame-fixed rods or rails 7 in such a way that the winding roll 3 according to the increase in diameter removed from the suction and knife cylinder 1.

If the web is to be wound into a winding roll 3, in which the other side of the web is on the outside, the web 4 runs from the deflection roller 5 in the direction of the arrow A On the further guide roller 8 on the suction and knife cylinder 1, reversing the direction of rotation, wherein the corresponding trajectory is shown in dashed lines.

From Fig. 2, the state is seen in which the continuously fed web provided with a transverse separating cut and the web beginning thereby formed is wound on the winding tube 2, which then apparent from their apparent from Fig. 1 Anwickelstellung in their from Fig. 2 apparent Position has been moved along the curved path 9, in which it is located in a winding frame for finish winding.

In Fig. 1, the winding tube 2 is bordered by a two kiappbaren housing shells 11, 12 existing housing 10 which surrounds the winding tube 2 concentrically to form a guide channel 13. Between the stimuli of the closed to a housing 13-housing shells 11,12 an inlet gap 14 is formed, in which the web beginning formed by a cross-cutting cut enters depending on the direction of rotation coming from the left or from the right. In this case, each of the web start of the suction and knife lifting cylinder edge of the inlet gap 14 is pivoted in a diameter plane 15 of the suction and knife cylinder, in which the edge of the jacket of the suction and knife cylinder is most approximated.

The winding core or the winding tube 2 is mounted with its shaft journal in a bearing shell 16 and provided in a known and not shown manner with a drive. From Fig. 3, the suction and knife cylinder 1 and the winding tube 2 with this enclosing housing 3 can be seen in the apparent from Fig. 1 position in which the web 4 is already separated by a cross cutting and the winding tube 2 in its Anwickelstellung located.

The suction and knife cylinder 1 has a steel shell 20, which is closed by end plates 21, which carries the suction and knife cylinder overlapping and driving shaft journals 22. The steel jacket 20 is provided with suction air holes 23 in axially extending rows. The interior of the suction and knife cylinder 1 is connected by a line and a rotary feedthrough in a known manner to a suction air source.

The jacket 20 of the suction and knife cylinder 1 is provided with a preferably vulcanized coating 24, the suction holes 23 also enforce, made of rubber or other elastomeric material.

The steel shell 20 including the coating 24 enclosing this is provided with an axially extending slot 25, the knife 26 enforce to sever the web 4. The slot 25 is bounded by edges of the steel shell, which are provided at equal intervals with circumferentially freely tapered recesses 28. In these recesses 28 are according to the radius of the suction and knife cylinder curved finger-like plates 29 which close the recesses 28 in the pivoted state. The plates 29 are also covered by the vulcanized rubber layer 24, but which is provided with the side edges of the plates 29 in alignment with circumferentially extending separating cuts, so that the plates 29 are pivotally connected at their inner ends only by the rubber layer 24 with the steel shell 20 , The swing plates 29 are provided with welded rams 30 which are interconnected by an axially extending rod 31. With the rod 31, the piston rod 32 of a pneumatic cylinder 33 is pivotally connected, which is hinged to a tab 34 which is welded to the inner portion 35 of the shaft journal 22. The pneumatic cylinder 33 is supplied via unillustrated rotary unions for its operation compressed air.

The pneumatic cylinders 33 are provided in duplicate, for swinging the finger-like plates 29 on both sides of the slot 25.

The legs 41, 42 of a U-shaped profile 43, in which a knife bar 44 is guided, are welded with the webs 40 surrounding the finger-like plates 29, whose end faces delimit the gap 25. The knife bar 44 is at equal intervals with knives 45 with triangular Provided cutting 46, which serve the transverse separation of the web 4. The knife bar 44 is provided in the region of its front and rear ends on both sides with rollers 47 which are guided in trapezoidal guide grooves 48 which are incorporated into the inner flanks of the legs 41, 42 of the profile 43. The knife bar 44 is articulated by a link 50 to a pivotally mounted on the end wall 21 of the suction and knife cylinder 1 lever 51, which in turn is pivoted to its reciprocal pivoting to the piston rod 54 of a pneumatic cylinder 53, in a sleeve 55 is pivotally mounted, which is welded in the end wall 21.

By appropriate axial displacement of the cutter bar 44 via the drive 50 to 55, the blades 45 are thereby excavated from the gap 25, moved in the axial direction and retracted again into the gap 25, that the rollers 47 run up the run-up slopes of the trapezoidal guides 48, over the straight extending middle section are moved in the axial direction and then be retracted by expiry on the other sloping edge. In order to carry out a continuous cut, the central sections of the guides 48, which run parallel to the axis of the suction and knife-type scanners, are at least as long as the distance of the knives 45 from one another.

The shells 11, 12 of the winding sleeve 2 enclosing housing 10 are pivotally mounted about a common axis 60 which are connected to support plates 61 which are mounted concentrically to the central axis 62 of the winding tube 2 pivotally. For pivoting the support plates 1, these are guided over guide rollers 63 in a fixed guide 64, which is curved concentrically to the axis 62. For pivoting the shells 11, 12 from their positions shown in solid lines in the dashed positions 11 ', 12', the shells 11, 12 articulated on their outer sides with arms 66, 67, the other ends hinged together and about the common pivot axis 68 are pivotally connected to the piston rod of a pneumatic cylinder 69 which is pivotally connected to the support plates 61. By appropriate actuation of the pneumatic cylinder 29, the housing shells 11, 12 for release Swing out the winding tube 2 and swing in to form the annular guide channel.

The housing shells 11, 12 are each provided in rows with Saugluftstutzen 70, 71, is sucked through the air depending on the direction of rotation of the suction and knife cylinder and the winding tube to support the wrapping around the web start in the guide channel to the winding tube 2 around.

Instead of the Saugluftstutzen 70, 71 and the dashed arranged in rows Blasluftdüsen 72, 73 can be provided, can be blown through the blowing air into the annular guide channel to umschlingend around the winding tube 2 in a corresponding manner the web start.

From Fig. 3, the state can be seen in which the cutting blades 26 have cut through the process in the axial direction in the slot 25, the web 4, wherein the end of the wound web and formed by the separating cut web start on the suction and knife cylinder through the Suction holes 23 is held.

As can be seen from Fig. 4, lift the finger-like plates 29 by appropriate pivoting through the pneumatic cylinder the web start from the enveloping cylinder of the suction and knife cylinder, so that this taken over by the fingers of one edge of the inlet slot of the housing and in the ring-shaped guide channel 13 is initiated.

From Fig. 5, the situation can be seen, in which the tail of the finished wound winding roll supplied and the web start has largely wrapped around the winding tube 2 to be wound.

In the embodiment of FIG. 10, the cutter bar 44 is guided by the rollers 47 in circular arc-shaped guides 48 a, which are incorporated into the inner edges of the legs 41, 42 of the profile 43. Through this kind of leadership lead the knife bar 44 and thus also the knife 45 during the cut of a circular arc-shaped movement, which has the consequence that the cutting movement in the plane of the web to be separated is superimposed on a cutting movement transverse thereto. In order to provide the web with a continuous cut, the cutting blades in the plane of the web move in the direction of the axis of the cutting cylinder, which is at least as large as the distance of the individual blades 45 from each other.

In the embodiment of FIG. 11, the cutter bar 44 is mounted at its ends to parallel core 80, whose other ends are mounted on brackets 81, which are welded to the end plates 21 of the knife cylinder. The length of the handlebars is such that they give the cutter bar a curve movement through which the blades 45 are guided by the web to be cut in such a way that the cutting movement in the plane of the web is superimposed on a transverse movement. The curvature of the knife bar is aligned so that the knife in the middle of their reciprocating motion reach the apex of the circular arc-shaped movement. For pivoting the parallel link 80, the piston rod of a pneumatic cylinder 82 is articulated to a parallel link, which in turn is pivotally mounted in a holder of the knife cylinder.

Foresightfully, it should be emphasized in relation to Figures 12 and 13 that the wrapping and finish-winding scheme illustrated therein is not critical to the invention in that it concerns the feeding of the cores and their transfer from a first to a second winding stage. Essential for the invention, however, are the Anwickeln by means of negative pressure in bi-directional operation and the web separation.

According to the scheme shown in FIG. 12, the web B, which is, for example, an endless plastic film, runs in the direction of and around the deflection roller 114, which can be moved horizontally in a manner known per se for regulating the web tension in the direction of the dashed double arrow. Then the web runs on and around a second guide roller 115 and from there to the winding roller 112, which is driven by a drive, not shown in the direction of the arrow R, ie counterclockwise, rotating at the desired operating speed. Inside the winding roller 112, two separating devices 116, 116 a are arranged. However, the use of two separators to peripherally opposed separators is not critical. Rather, it is also possible to work with a single separating device or with a plurality of winding rollers distributed uniformly around the circumference of the winding roller, which not least also depends on the circumference of the winding roller and its operating speed.

To initiate the Anwickelns takes the first pivot arm 115 'a fresh Wikkelhülse 111, which has a winding core in a conventional manner and from a (not shown) magazine with a (not shown) conveyor in the end of the pivot arm 115' is inserted. The winding tube comes into contact with the winding roller 112 or very close to this and is of this and / or its own (not shown) central drive of the sleeve or its core in Fig. 1 in opposite directions to the winding roller, i. clockwise, rotated. This is referred to as the "first reel station or phase". The bell 19 is in the representation of Fig. 1 is still at rest, i. it is removed from the winding roller 12 and its shells are open.

Since none of the separating devices 116, 116a has been actuated in the state of the tube change shown in FIG. 12, the web B travels from the winding roller 112 to the almost full film roll 113 in the "second winding station or phase". The film roll 113 is also connected to a central drive (not shown) and rotates in the direction of the arrow R, i. clockwise.

It should be emphasized that the second winding station in Figures 12 and 13, although by a pivot arm 117, 127 is shown to make the running there take-off winding and the delivery of the full film wrap in a simple manner that the arm 117, 127 but Of course, by a known Can be replaced, which brings the holder for the film roll 113, 123 by means of a movement device in the respective required position, for the acquisition of the wound winding tube 111, 121 and for the preferably adjustable contact pressure in the final winding of the film roll on the winding roller and finally for the discharge of the finished film roll is required.

Likewise, in the practice of the present invention, it is possible to guide the winder drum on a carriage and to hold the film winder stationary in the second winder station, as described in US Pat. No. 5,275,348.

The advantages of the adjustability of the pressure (linear pressure, eg in kg / m), with which the film roll 112, 123 in the second winding station on the winding roller 112, 122 is applied, to a value between zero and a few hundred kg are in the above-mentioned patent No. 4,191,341, to which reference is expressly made, and whose control of the pressure between the winding roller and the film roll in the second winding station is preferably also used in the present invention.

The control of the winding tension, which is likewise preferred for the present invention, and the apparatus measures suitable for this purpose are described in the aforementioned US Pat. No. 5,275,348, to which reference is likewise made for further explanation.

Fig. 13 shows again a web B, on and around the first guide roller 124, but not on and around the broken drawn and not in operation here deflecting roller 125 but directly on the in the direction of the solid part of the arrow R, ie here in Clockwise, rotating winding roller 122 runs, in the interior of which also two mutually peripherally opposed separating devices 126, 126a are arranged. In other words, the winding direction is reversible even if the web B always in the same direction in the film winder enters, ie in Figs. 12 and 13 alike "from the bottom left". The pivot arm 125 is now in a position between 1 o'clock and 2 o'clock and the winding tube guided by it is enclosed by the bell 129 in the working position.

As will be explained in more detail below, 126 and 126a of the still running on the film roll 123 web section is now separated by actuation of a separator and the resulting front end of the following track section in the bell 129 on the fresh winding tube 111 inside the bell 129th initially wound.

Now, the finished film roll 123 can be moved to the broken position 127b, i.e., by actuating the pivot arm 127. in the unloading position 123a, brought and transported away. The pivoting arm 127 then moves from the position 127b in the broken-through position into the position 127a, which is also shown in broken lines, and is now ready to take over the winding tube wound in the bell 129.

To initiate the transfer of the wound winding tube from the first to the second winding phase, the bell 129 must be opened and the pivot arm 125 are brought into the broken position 125a. After delivery of the coiled fill roll, the swing arm 125 returns to the vertical position of FIG. 12 before receiving the next fresh roll tube.

14 shows the diagram of the Anwickelglocke 119 already indicated in Fig. 12 in the open state. Their two shells 131, 132 are articulated, for example with hinges 331.332 on the support 133. Each shell has a substantially closed interior 310, 320 which is enclosed by an outer wall 311, 321, an Innwand 312, 322, one of the shape of the winding roller adapted, ie correspondingly curved connecting wall 313, 323 and two side walls. The side walls (of which only the rear walls 318, 328 seen by the viewer are shown) each have a wall continuation with a approximately semicircular recess, which corresponds to the shape of the winding tube and this encloses so that at a in each case connected to the vacuum source interior 310, 320 and then prevailing therein negative pressure to minimize lateral inflow of air.

Near the free lower ends E1, E2 of the shells 131, 132, the suction slots 319, 329 are arranged, and each cavity 310, 320 has at the upper end a passage 324, 325 for connection to the interior 330 of the support tube 133. It is understood that the support for the bell does not necessarily have to serve as a connection to the vacuum source. This connection can also be accomplished by a separate and, for example, flexible conduit, which is optionally connected to the means (for ease of illustration in the figures omitted) for moving the bell from working position to rest and for opening and closing the shells. The means for moving the bell from a "rest position" to a working line is preferred but not critical to the invention. On the other hand, the ability of the shells to open and close the bell is essential, because this is the introduction of the fresh winding tube into the first winding station (or "Anwickelstation") and the transfer of the wound winding tube from the first to the second winding station (or "Fertigwickelstation"). is required.

As "suction slits" are understood here both continuous and discontinuous perforations, i. the "suction slot" can also be an equivalent row of holes.

To control the suction air flow in the present example, a slide 334 is arranged in the support 133 in order to block the connection with the vacuum source either for both shells 131, 132 (when the bell is at rest or on the way from or to its working position), or (in the working position according to FIG. 14) to establish the connection of the vacuum source with only one of the two cavities 310, 320.

Fig. 15 shows the bell 129 of Fig. 14 now in working position on the winding roller. It is understood that the bell closes only when the fresh winding neck 121 has been transferred with its core 121a of a pivoting arm of FIG. 12 or equivalent mechanism from the magazine in the Anwickelposition shown in FIG. 15 and held in this position becomes.

Of the winding roller is shown in Fig. 15 for ease of illustration, only a part of the shell of the winding roller 134, which is provided with a plurality of preferably approximately uniformly distributed on the shell of the winding roller openings 341 to the film web B in a conventional manner below the effect of the pressure prevailing in the interior of the winding roller vacuum to hold firmly on the winding roller.

Upon actuation of the cutting device 136, the film web B is separated by a transversely to the direction of movement (counterclockwise, arrow R) extending continuous section in a manner explained in more detail below. For this purpose, a plurality of separating elements 364 is arranged to move together in the direction of the double arrow in and through the slot 360. To form the continuous cross-web cut, the dividers are moved radially (i.e., in the direction of the double-headed arrow) outwardly as well as axially (i.e., perpendicular to the plane of the drawing) to effect web separation. The movement length in the axial direction is dimensioned so that each separating element at least travels through the distance to the adjacent separating element.

The combination of radial and axial movement is essential for smooth web separation in the processing of film webs because they typically have some ductility and tend to deflect from a blade acting on them without supporting the film. Opposite pointed dividers, this tendency is less pronounced, ie a perforation is easier, for a quick and smooth web separation but not sufficient. The required additional separation effect is due to the axial movement the preferably provided with sharp side edges pointed separating elements causes, as explained below in more detail.

By separating cut the rear end of the preceding film section is formed, which is pulled past the Anwickelglocke 129 and runs on the (not shown here) finished film roll. At the same time created by the cut the front end of the following track section, which is to be wound on the Wikkelhülse 121.

It is within the scope of the invention to generate an overpressure in a chamber 361 surrounding the cutting device 136 in order to accelerate the front end of the following material web outwards in the radial direction in order to at least reduce the adhesion to the winding roller. However, this measure is not critical.

It is essential that the formed in the web separation front end of the following web B is applied and wound in the region of the bell 129 by local negative pressure between the winding tube 121 and the front end of the web B on the winding tube, according to the invention even in bi-directional operation the winding device.

In general, for this purpose, the respective "downstream" ie in Fig. 15 in the direction of movement R of the web B "back" lying shell 131 and not in the direction of movement "upstream" or more "front" lying shell 132 is actuated. This operation is effected in that the respective interior of the corresponding chamber is connected to the vacuum sources, here for example by operation of the slide 334 coincides so that the opening 335 in the slider with the opening 325 at the upper end of the shell 131 matches and thereby the Innraum 310 of the shell 131 is connected via the interior 330 of the carrier 133 with the vacuum source.

As a result of the negative pressure generated in the interior 330 of the shell 131 ambient air is sucked through the gaps 351, 352 between the web B on the winding roller 134 and generates in the channels 136, 137 a passing through the suction slot 319 of the shell 131 suction air flow. At an air flow speed, which, as already indicated, is preferably at least twice as long as the running speed of the web, the severed front end of the following web section is drawn into the channel 136 and through the channel 137 and, as the winding tube 121 rotates, contacts the latter , Generally, the common length of the channels 136, 137 is sized to encompass at least 270 ° of the circumference of the winding tube. By arranging the suction gap 319 of the shell 131 close to its lower end E1 (FIG. 14), the suction air flow guided through the channels 136, 137 upon actuation of the shell 131 surrounds the winding tube in almost the same amount.

As a result of the continued rotation of the winding tube 121, each subsequent layer of the film web B, which runs onto the winding tube 121, fixes the layers already thereon; so that a tension-resistant connection between the film web B and the winding tube 121 comes about, i. the critical part of the Anwickelvorgangs is completed and the wound with multiple layers of the film web sleeve 121 as explained above can be transferred from the first to the second winding station.

In the reverse direction of rotation of the winding roller 134 (ie clockwise and counter to the direction R), the Anwickelvorgang runs in an analogous manner, ie the front end of the web B is wound by means of the suction air stream, which in turn is sucked through the column 351, 352, but this time by operating the shell 132 by connecting the associated interior space 320 to the vacuum source via the slider 334 which shifts to release the 324, and the resulting suction air flow first into the channel 137, then the channel 136 and finally through the suction gap 329 at the free lower end E2 of the shell 132 runs. The separation process is effected by the separator, which tapers next to the gap 352.

Fig. 16 illustrates the principle of a preferred web separation device 140 according to the invention which is useful not only for the web winding method described herein but also for other purposes requiring rapid, secure and smooth severing of a web of material, particularly a polymeric film web , require.

The effect of a web separation device 140 according to the invention is essentially based on the fact that several, e.g. via a slide 142 motion-connected tip separating elements 141 in the radial direction (ie, the directions of the double arrow MR) through the (not shown in FIG. 16 slot in the shell of the winding drum are guided outwards and perforate the web B accordingly, and also in the axial direction (ie, in the direction of the double arrow MA), at least to the extent that each of the elements 141 travels at least one length L distance corresponding to the distance between two adjacent elements 141. Thus, the initial perforation of the web B is achieved by means of the sharp side edges 411, 412 As already indicated, this separation technique is advantageous for the web separation of the usually extensible polymer films.

This can be achieved in a structurally simple and therefore preferred manner in that the separating elements 141 are arranged on the slide formed as a slide 142, which is guided in a manner not shown that of the recesses 143 and the fixed Führungsbofzen 144th at each actuation of the drive 148 in the direction of the double arrow MA first in the radial outward direction for contact all pointed separating elements 141 brought to the film web, then laterally in the axial direction and finally in the radial direction is moved inwards. The pointed separating elements 141 cause this first a perforation and immediately connect thanks to the axial movement by means of the cutting edges 411, 412 a cutting through the film web. By the further movement of the sliding block 142 until the stop of the pin 144 at the opposite end of the recess 143 the cutting elements 141 finally pulled back so far that the film web B does not come into contact with the separating elements 141

As can be seen from FIG. 16, the limitation of the movement in the axial direction defined by the openings 143 can certainly be greater than the distance between two adjacent separating elements 141, in particular if this ensures the safety and completeness of the web separation. In addition, the movement of the separating elements in the axial direction need not necessarily be linear, but may be e.g. Wavy zigzag course, with appropriate adjustment of the passage openings for the separating elements in the shell of the winding roller.

It is understood that the drive 148 preferably generates a sudden movement which is completed in fractions of a second, typically less than 0.1 sec. This determines the duration of the separation process, which in turn can be adapted to the web speed.

It will be readily apparent that the above description of specific preferred embodiments of the invention may be modified by those skilled in the art in various ways. The scope of application of the invention is therefore determined by the professional interpretation of the following claims.

Claims (23)

1. Method for severing a material web (4) running to a driven winding reel and for securing the trailing web start on a winding core or winding tube (2), in which the web (4) is guided to the winding reel (3, 113, 123) via a guide device preferably consisting of a winding roller (1) and, after being severed in a guide duct (13; 136, 137), is laid around the winding tube, characterized in that the web is fed, during winding, to the winding tube from left or from right, depending on the desired outer face, and the winding tube or winding core is driven in a corresponding direction of rotation, the said directions of rotation being in each case opposite to one another.
2. Apparatus for carrying out the method according to Claim 1, with a guide device (1) guiding the web (4) to the winding reel (3), with a knife (45) severing the web (4), and with means for diverting the web start from the guide device onto the driven winding tube (2), and with a guide duct (13) for laying the web (4) around the winding tube (2), characterized in that the guide device can be driven in order to wind the web with alternating outer faces onto the winding tube (2), and the winding tube or winding core can be driven in conveying directions opposite to one another.
3. Apparatus according to Claim 2, characterized in that the guide device consists of a driven suction roller (1) with a severing knife (26, 45) extendable from an axially running gap (25) of the casing and, on both sides of the gap (25), of pivotably arranged casing shells (29) which introduce the web start lifted out of the enveloping cylinder to the guide duct (13) in rotation to the left or to the right, depending on the running direction of the web (4).
4. Apparatus according to Claim 2 or 3, characterized in that the winding tube (2) is concentrically surrounded, so as to form the guide duct (13) consisting of an annular space, by a cylindrical housing (10) which is provided with an axial entry gap (14) for the web start.
5. Apparatus according to one of Claims 2 to 4, characterized in that the cylindrical housing (10) consists of two pivotably mounted housing shells (11, 12) which, in the outwardly pivoted state, release the winding tube (2).
6. Apparatus for diverting the front end of a material web according to one of Claims 2 to 5, characterized in that the pivotable casing shells consist of a comb-like grid or finger-like plates (29) which or whose fingers running out freely toward the gap (25) in the circumferential direction pass, in the outwardly pivoted state, through fingers which are arranged so as to be offset correspondingly and which on both sides form the edge regions of the entry gap (14) of the housing (10).
7. Apparatus according to one of Claims 2 to 6, characterized in that, in order to displace the entry gap (14), the housing (10) is mounted pivotably about the mid-axis (62) of the winding tube (2).
8. Apparatus according to one of Claims 2 to 7, characterized in that a pivoting drive (66 to 69) for the housing shells (11, 12) is provided.
9. Apparatus according to Claim 8, characterized in that the pivoting drive consists of links (66, 67) which are articulated at their one ends on the housing shells (11, 12) and on whose other ends connected to one another in an articulated manner a pneumatic cylinder (69) is articulated.
10. Apparatus according to one of Claims 2 to 7, characterized in that each of the housing shells (11, 12) is provided with suction-air nozzles (70, 71).
11. Apparatus according to one of Claims 2 to 9, characterized in that each of the housing shells is provided with blast-air nozzles (72, 73).
12. Apparatus according to one of Claims 2 to 11, characterized in that the casing shells (29) are provided with pivoting drives consisting of pneumatic cylinders (33).
13. Apparatus for severing a running web by means of a transversely running severing cut according to one of Claims 2 to 12, characterized in that the knife (26) consists of individual knives (45, 46) fastened at equal intervals to a knife bar (24), and in that the knife bar (44) is guided in guides (48) of the suction and knife cylinder (1) in such a way that the said knife bar moves the knives (45) out radially, moves them in the axial direction and moves them in again radially.
14. Apparatus according to Claim 13, characterized in that the knife bar (44) is provided in the region of its ends with rollers (47) which run in trapezoidal guides (48).
15. Apparatus according to Claim 13, characterized in that the radial and axial movements of the knives (45) are superposed one on the other.
16. Apparatus according to Claim 15, characterized in that the knife bar (44) is guided in curved guides, for example circularly arcuate guides (48a), of the suction and knife cylinder (1).
17. Apparatus for severing a running web by means of a transversely running severing cut according to one of Claims 2 to 12, characterized in that the knife consists of individual knives (45, 46) fastened at equal intervals to a knife bar (24), and in that the knife bar (44) is mounted on parallel links (80) which are provided with a pivoting drive (82) and which pivot the knives (45) on a circularly arcuate path.
18. Method for winding a continuously running material web (B) onto a series of winding tubes (111) by means of a winding apparatus (101), according to Claim 1, with a winding roller (112), with at least one deflecting roller (114) and with at least one severing device (116), the front end, formed during the actuation of the severing device, of the running material web being wound on the winding tube (111) by means of a suction-air stream, characterized in that, to operate the winding -apparatus (101) as a bidirectional winder, for winding each winding tube (111) a bell (119, 129) surrounding this winding tube is used, which is formed by two elongate shells (131, 132) which are connected movably to one another for closing and opening the bell (119, 129), each of the shells (131, 132) having near its movable end (E1, E2) a suction slot (319, 329) extending at least approximately over the length of the winding tube, and in each case only one of the two suction slots, preferably the suction slot (319) lying downstream in the direction of rotation (R) of the winding roller (112, 134), is actuated for winding, and in that the at least one severing device (116; 136) is arranged inside the winding roller (112; 134).
19. Method according to Claim 18, characterized in that the severing device (116) arranged inside the winding roller (112) possesses a plurality of pointed severing elements (141) with lateral cutting edges (411, 412) which, to cause the severing operation, are designed to be movable by means of the casing (149) of the winding roller outwards in the radial direction (MR) and at least approximately parallel to the axis of the winding roller in the axial direction (MA), the length of movement of each severing element (141) in the axial direction (MA) in the axially parallel direction being selected such that the material web (B) is continuously severed transversely.
20. Method according to Claim 18 or 19, characterized in that the material web (B) is held in contact with the winding roller by means of a vacuum prevailing inside the winding roller (112).
21. Method according to one of Claims 18 to 20, characterized in that the web material (B) is preferably a plastic film and is wound onto the winding tubes (11) at a running speed of about 30 - 400 m/min.
22. Method according to Claim 21, characterized in that the speed of the air stream at the suction slot (319, 329) during its actuation is at least twice and preferably at least three times as high as the running speed of the material web, and the suction-air stream is guided around at least about 270° of the circumference of the winding tube.
23. Method according to one of Claims 18 to 22, characterized in that, during the actuation of the severing device (116; 140), the material web (B) bears against the winding roller at least over about half the circumference of the latter.

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