EP1640300A2 - Device for winding a continuous material web - Google Patents

Abstract

A material length (4) is moved to a winding roller (3) by pref. a winding cylinder (1) and after cutting is placed in a guide channel (13) around a winding core (2). The length is fed to the winding sleeve from left or right dependent upon the desired front, and sleeve or core are driven accordingly in one of two opposite directions. The material guide winding cylinder is also driven in opposite directions. The device may have a driven suction roller (1) to act as guide unit, with a cutting knife moving out of a gap in the roller jacket.

Description

The invention relates to a device for winding a continuous web.

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 to form winding reels 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 disturbance or diversion of the continuously fed web.

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 initial web formed thereby is wound up by the fact that in the nip between the Feed roll 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 cup-shaped curved wall which forms a cup-shaped curved channel with a portion of the circumference of the winding tube, at the front End in the region of the nip through the suction box air is sucked 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 runs, 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 winding rolls to be wound up 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 is located on the winding roll outside. In order 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.

A fundamental object is therefore to provide a device 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 one or the other Side outside can be wound up to a winding roll.

The solution to this problem consists of a web winder, i. a device for winding a continuous material web on a series of cores with a winding roller, at least one guide roller, at least one separating device and means for winding the formed on actuation of the separator front end of the moving material web by a suction air flow to the winding tube; the winding device according to the invention suitable for bi-directional operation has a bell which comprises the winding sleeve to be respectively wound and formed by two elongated shells, each of the shells being close to its free, i.e. not connected to the other shell end, has a at least approximately over the length of the winding tube extending suction slot; the bell further has means for actuating 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, polyethers, polyurethanes, polyamides and the like, in particular if these films have a different surface finish on both sides thereof.

Conveniently, 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 provided with perforations 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 may be located in a chamber which is closed against the interior of the winding roller, practically only via a corresponding slot and, if necessary, suitable openings 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 the Anwickeln and finish wrapping. 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 also 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.

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

Fig. 1

eine Stirnansicht einer schematisch dargestelltenrichtung 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 Anwickelglocke 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.

Embodiments of the invention are explained below with reference to the drawing. In this shows

Fig. 1

an end view of a schematically illustrated direction for continuously winding a moving web of material to wound rolls, on which the web is wound externally on one or the other side optionally 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,

Figure 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 Anwickelglocke in a schematic representation with open 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 front 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 forming on this winding roll can be employed to drive them directly on the circumference of the suction and knife cylinder. 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 to a winding roll 3, in which the other side of the web is outside, the web 4 runs from the guide roller 5 in the direction of 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 enclosed by a two foldable housing shells 11, 12 existing housing 10 which surrounds the winding tube 2 concentrically to form a guide channel 13. Between the end edges of the housing shells 11, 12 closed to a housing 13, an inlet gap 14 is formed into 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.

With the finger-like plates 29 enclosing rust-like webs 40 whose ends limit the gap 25, the legs 41, 42 of a U-shaped profile 43 are welded, in which a knife bar 44 is guided. The cutter 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 which is pivotable in a sleeve 55 is stored, which is welded into 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 cylinder, are made at least as long as the spacing 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 it is taken over by the fingers of one edge of the inlet slot of the housing and in the annular 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 on 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 curve movement of the cutter bar is oriented such that the knife in the middle of their reciprocating motion reach the apex of the circular arc 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 wrapped film sleeve, the pivot arm 125 returns to the vertical position shown in FIG. 12 before it picks up the next fresh winding 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 the sake of simplicity of illustration in the figures) for moving the bell from division of labor to rest and for opening and closing the shells. The means for moving the bell from a "rest position" to a division of labor 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 slots" are understood here both continuous and discontinuous openings, 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 tube 121 has been transferred with its core 121 a of a pivoting arm of FIG. 12 or a similar mechanism from the magazine in the Anwickelposition shown in FIG. 15 and in this position is held.

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 sleeve 121, each successive layer of the film web B running onto the winding sleeve 121 fixes the layers already thereon so that a tension-proof connection between the film web B and the winding sleeve 121 is achieved, i. the critical part of the Anwickelvorgangs is completed and the angepeite with multiple layers of the film web sleeve 121 as described 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 actuating the shell 132 by connecting the associated interior space 320 to the vacuum source via the slides 334 shifted to release the 324 and the suction air flow resulting thereby 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.

Figure 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 or web wrapping apparatus described herein but also for other purposes requiring rapid, secure and smooth cutting of a web, especially a polymer 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 142 formed as a guide slide, which is guided in a manner not shown that of the recesses 143 and the fixed guide pin 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 (6)

Apparatus (101) for winding a continuously moving material web (B) onto a succession of winding cores (111) with a winding roller (112), at least one deflecting roller (114), at least one separating device (116) and a device for activating upon actuation of the Separating device formed front end of the running material web (B) by a suction air flow to the winding tube (111) to wind, characterized in that the winding device (101) for bi-directional operation for the Anwickeln as means for Anwickeln a winding each of the winding sleeve (111 ) has extensive bell formed by two elongated shells (131, 132) (119, 129). Apparatus according to claim 1, characterized in that each of the shells (131, 132) near its respective free end (E1, E2) has a suction slot (319, 329) extending at least approximately over the length of the winding tube (111). Device according to one of claims 1 or 2, characterized in that the bell (119, 129) has means (311, 312; 320, 321; 325; 334; 130) for in each case one of the suction slots, preferably in each case in the direction of rotation ( R) of the winding roller (112) downstream suction slot (319), to be wound on. Device according to one of claims 1 to 3, characterized in that the separating device (116) in the interior of the winding roller (112) is arranged. Apparatus according to any one of the preceding claims, characterized in that the winding roller (112, 134) has a plurality of apertures (341) and is connected to a source of negative pressure, around a web of material (B) adjacent the winder drum (112, 134) to maintain firm contact with the winding roller (112). Device according to one of the preceding claims, characterized in that the shells (131, 132) in the closed state of the bell (129) together with a winding tube (111) enclosed by the bell (129) have an approximately annular channel for guiding a suction air flow around the bell Winding sleeve (111) form to guide the suction air flow by at least about 270 ° of the circumference of the winding tube (111).

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