EP1449772A1 - Method and device for wrapping a film around a cylindrical roll of material - Google Patents

Abstract

The assembly (10) to wrap a product roll (13,14), with a stretch plastics film, wraps the two end surfaces (33,34) and a mantle surface (32) of the roll. The film is unwound from a film head (12), with spatial movements on a robot arm carrier (11) through an automated and computer-assisted positioning system. The swing axis of the carrier is on a straight line at right angles to the roll center axis at the center point of the roll, independent of the product roll dimensions. The film head has a unit to establish the size and position of the product roll.

Description

The invention relates at least to a device for wrapping one in a receiving and drive device about a supporting axis rotatably mounted, with two end faces and one lateral surface provided, cylindrical product roll with a plastic stretch film, which is rollably attached to a moveable film head, which is arranged on a movable support device, the Device an automatic, computer-aided position control of the film head.

Such a device is known from US 5 203 139. Die Device has a turret turret, which with several driven pin is provided, on which in turn product rolls are rotatably mounted. A roll of film is in a film head Movable linearly in three spatial directions and around two axes pivoted. With the help of the device it is possible to Pack product roll with film while another roll of product wrapped and for example a third film roll already packaged is removed from the turret. That way it is possible to continue the packaging process continuously without wait for product roll replacement.

The disadvantage of this device is that with the help of Revolver head smaller product roles, such as Rolls of film can be packed, but not heavy rolls of film which are wrapped in metal foils or steel sheets. Besides, is limited mobility of the film head. Also regarding the Flexibility with regard to different product roll dimensions and the precision of the winding process is the device improvement.

Such a device is also from DE 691 06 801 known. In this device, the film roll is on one by two Axis swiveling foil head arranged. In addition, the Foil head can be shifted in height on a linear guide Carrier stored. The product to be packaged is on a Rotary table that can be rotated about an axis by means of a drive. A disadvantage of this device is that the film head is very has limited flexibility of movement. One to the product adjusted optimal wrap is not always possible. Also this device has disadvantages in terms of flexibility different product roll dimensions, the Packaging capacity and the accuracy of the Packaging process.

Based on the latter state of the art, it is therefore the object of the invention to provide a device with which improved accuracy of the packaging process as well as a higher Capacity and greater flexibility in terms of different Product roll dimensions is achieved.

The solution to the problem results from the characteristics of Claim 1, in particular from the characterizing features, after which the support device controlling the film head in one unchangeable position to in the receiving and drive device arranged product roll is pivotally mounted, the Pivot axis of the support device regardless of the size of the Product roll on a right angle to the roll center axis in the area of the Roller center arranged straight line.

The advantage of the device according to the invention is that that the focus of the product role is independent of the Dimensions of the product roll always in the same position Swivel axis of the support device is located and therefore the product roll can be measured and packed very precisely. That way it is therefore possible to flexibly adapt the packaging process to different Adjust dimensions of the product roll, increasing accuracy of the packaging process and the capacity is increased. With the device according to the invention can be the product roll pack completely dust and moisture proof. Finally are due to the defined arrangement also the requirements for the Control of the carrier is lower, which saves costs become.

In a first embodiment, the film head has a Set up from which despite the wrapping process decreasing diameter of the film roll a defined distance between the film head and the outer surface of the product roll is achievable. A defined distance between the film head and the The outer surface of the product roll is particularly advantageous for one controllable packaging process. Despite different Product roll size can thus be a constant Packaging quality can be achieved. Such a facility can consist of a laser sensor, for example, which by means of a Laser beam determines the distance to the product roll and to a Passes control that causes the support device, the Film head at a calculated distance from the surface of the product roll to keep.

In a preferred embodiment, the device for Creation of a defined distance from one of the film rolls upstream deflection roller formed during the winding process provides a defined film withdrawal line. In this way it is possible to reduce the diameter of the film roll To disregard the unwinding process. The distance between The film head and lateral surface of the product roll is always going out measured by the pulley, since it provides the pull line from which leaves the foil head from the foil.

In a further embodiment of the invention, the film head a device on the one during the winding process Substantially constant stretching of the plastic stretch film guaranteed.

According to a further embodiment, the film roll can be used for this be arranged on an unwinding device which with a Brake device is provided, which depending on the during the wrapping process decreasing diameter of the The essentially constant stretch of the stretch film causes. Due to the decreasing film roll diameter of the decreasing lever arm increasing unwinding resistance can be kept constant by such a braking device, the less the brakes are applied, the lower the Foil roll diameter is.

The braking device is according to a further embodiment designed as a magnetic powder brake. Such a magnetic powder brake is available as a standard component on the market and allows an accurate Setting the braking force too.

Another embodiment of the invention provides that the Film head has a clamping and cutting device for the film. After the film has been removed, this can be done using the clamping device Foil end held in a defined position and in the following Winding process can be placed precisely on the product roll. The cutting device cuts the film by hand superfluous and the process more economical.

According to a further embodiment, the clamping and Cutting device with a pressure device for the film end Mistake. After the separation process, the product roll side Foil end can be easily applied to the product roll where it adheres, for example, through static charge.

This pressure device can according to another Embodiment can be designed as a brush, which the Pressure device makes inexpensive and insensitive to failure.

Another embodiment provides that in the swivel range a device for the carrying device of the film head Provision and attachment of an adhesive element on Foil start is arranged. By means of such a device is a economical and precise application of the adhesive tape on the Foil start possible.

According to a further embodiment, Processing area of the robot arm at least two recording and Drive devices are arranged. While wrapping one Foil roll, the loading and unloading process can another film roll on another recording and Drive device can be made, reducing the capacity of the device according to the invention is significantly enlarged.

Furthermore, the invention relates to an automatic computerized process for wrapping one around one Support axis rotatable, with two end faces and a lateral surface provided, cylindrical product roll with a plastic stretch film, wherein the film is arranged on a moveable film head.

Such a method is known from US 5 203 139. at This procedure alternates sections of the left and the right end of the product roll wrapped up until both ends are completely covered. When switching between the End faces also the already partially packaged outer surface of the Product roll wrapped in foil. The procedure is therefore related to Efficiency, but also in terms of packaging precision and the capacity disadvantageous. Also in terms of flexibility, to be able to pack different product roll dimensions the method has disadvantages.

Such a method is also known from DE 691 06 801 known. In this process, an initial section of a film first attached to a lateral surface of a product. Then a film head carrying the film roll drives the product parallel to the lateral surface, with the film head first by 90 ° was pivoted and in this way continuously a film web is applied. The end face of the product is covered by the Film head is rotated about a further pivot axis, which to the first pivot axis is orthogonal. This procedure is both in its flexibility in terms of product dimensions as well Accuracy of packaging needs improvement.

Based on the latter state of the art, it is therefore the object of the invention to provide a method with which improved accuracy and flexibility with regard to changing Product roll dimensions as well as a higher capacity and Economy of the packaging process is achieved.

a) Messung der Länge der Produktrolle und des Abstandes einer definierten Abzugslinie des Folienkopfes zur Mantelfläche der Produktrolle;

b) Anbringung eines Klebemittels an den Folienanfang;

c) Anbringen der Folie an der Mantelfläche der Produktrolle;

d) Antrieb der Produktrolle mit konstanter Drehzahl;

e) Verfahren des Folienkopfes parallel zu einer Längsmittelachse der Produktrolle zumindest teilweise über einen ersten Endbereich hinaus;

f) Schwenken des Folienkopfes um 90° in Bewegungsrichtung;

g) Nach Abdeckung eines bis zur Achse reichenden Teilbereiches der Stirnseite Rückschwenken des Folienkopfes;

h) Danach mehrmaliges Wiederholen der Verfahrensschritte f) und g), wobei bis an die Umfangsfläche der Traghülse umlaufend anliegend jeweils unterschiedliche Bereiche der Stirnseite bis zur vollständigen Umhüllung abgedeckt werden;

i) Verfahren des Folienkopfes parallel zur Längsmittelachse des Produktes zumindest teilweise über einen zweiten Endbereich der Produktrolle hinaus, wodurch gleichzeitig die Mantelfläche der Produktrolle vollflächig umwickelt wird;

j) Durchführung der unter f), g) und h) aufgeführten Verfahrensschritte;

k) Schwenken des Folienkopfes in die Ausgangsstellung sowie Bewegung des Folienkopfes in Richtung Produktrollenmitte;

l) Abbremsung der Produktrolle bis zum Stillstand;

m) Klemmung und Durchtrennung der Folie;

n) Bewegung des Folienkopfes in unmittelbare Nähe der Mantelfläche;

o) Andrücken des Folienendes.

The solution to the problem results from the features of claim 11, in particular the following method steps:

a) measurement of the length of the product roll and the distance of a defined withdrawal line of the film head to the outer surface of the product roll;

b) attaching an adhesive to the beginning of the film;

c) attaching the film to the outer surface of the product roll;

d) driving the product roll at constant speed;

e) moving the film head parallel to a longitudinal central axis of the product roll at least partially beyond a first end region;

f) pivoting the film head by 90 ° in the direction of movement;

g) after covering a portion of the end face extending up to the axis, pivoting back of the film head;

h) then repeating process steps f) and g) a number of times, covering different areas of the end face lying all the way up to the circumferential surface of the support sleeve until it is completely covered;

i) moving the film head parallel to the longitudinal central axis of the product at least partially beyond a second end region of the product roll, whereby at the same time the entire surface of the product roll is wrapped;

j) carrying out the process steps listed under f), g) and h);

k) swiveling the film head into the starting position and moving the film head towards the center of the product roll;

l) deceleration of the product roll to a standstill;

m) clamping and cutting the film;

n) movement of the film head in the immediate vicinity of the lateral surface;

o) pressing the film end.

The method according to the invention has the in relation to the Advantages mentioned device.

In one embodiment, the film head after the Packing a product roll to another recording and Drive device pivoted and the packaging process on one another product role repeated, during which the already packaged is exchanged for an unpacked product roll. During the Packing a roll of film can do more in this way Film rolls brought into the receiving and drive device or are taken from it, creating an almost continuous Packaging process is possible. The capacity of the device will thus significantly increased and the economy increased.

Fig. 1a eine Seitenansicht einer Vorrichtung zum Umwickeln einer Produktrolle in Ausgangsstellung zum Verpacken einer Produktrolle 13,

Fig. 1b eine Seitenansicht einer Vorrichtung zum Umwickeln einer Produktrolle in Ausgangsstellung zum Verpacken einer Produktrolle 14,

Fig. 1c eine Draufsicht auf eine Vorrichtung zum Umwickeln einer Produktrolle gemäß Fig. 1a und 1b unter Kennzeichnung des Schwenkwinkels des Folienkopfes,

Fig. 2a eine Seitenansicht der Vorrichtung während des Aufbringens eines doppelseitigen Klebebandstreifens auf den Folienanfang,

Fig. 2b eine Draufsicht auf die Vorrichtung gemäß Fig. 2a,

Fig. 3a eine vergrößerte Frontansicht des Folienkopfes während der Aufnahme des Klebebandstreifens,

Fig. 3b eine vergrößerte Ansicht des Folienkopfes gemäß des Ansichtspfeils III in Fig. 3a,

Fig. 4a eine seitliche Ansicht der Vorrichtung beim Messen des Produktrollendurchmessers,

Fig. 4b eine Draufsicht auf die Vorrichtung gemäß Fig. 4a,

Fig. 5a eine seitliche Ansicht der Vorrichtung während der Bestimmung der Position in der linken Stirnfläche,

Fig. 5b eine Draufsicht auf die Vorrichtung gemäß Fig. 5a,

Fig. 6a eine Seitenansicht der Vorrichtung beim Messen der Position der rechten Stirnfläche,

Fig. 6b eine Draufsicht auf die Vorrichtung gemäß Fig. 6a,

Fig. 7a eine seitliche Ansicht der Vorrichtung während des Aufklebens der Folie auf die Mantelfläche der Produktrolle,

Fig. 7b eine Draufsicht auf die Vorrichtung gemäß Fig. 7a,

Fig. 8a eine seitliche Ansicht der Vorrichtung während die Produktrolle in Rotation versetzt wird,

Fig. 8b eine Draufsicht auf die Vorrichtung gemäß Fig. 8a,

Fig. 9a eine seitliche Ansicht der Vorrichtung während des Umwickelns unter Einhaltung des Abstands A zwischen Mantelfläche der Produktrolle und Umlenkrolle des Folienkopfes,

Fig. 9b eine Draufsicht auf die Vorrichtung gemäß Fig. 9a,

Fig. 10a eine seitliche Ansicht der Vorrichtung während des Umwickelns eines rechten Endbereichs der Produktrolle,

Fig. 10b eine Draufsicht auf die Vorrichtung gemäß Fig. 10a,

Fig. 11a eine seitliche Ansicht der Vorrichtung beim Aufbringen der Folie auf einen Teilbereich der rechten Stirnfläche der Produktrolle,

Fig. 11b eine Draufsicht auf die Vorrichtung gemäß Fig. 11a,

Fig. 12a eine seitliche Ansicht der Vorrichtung während des Umwickeln eines rechten Endbereichs der Produktrolle, nachdem bereits mehrere Teilbereiche der Stirnfläche abgedeckt wurden,

Fig. 12b eine Draufsicht auf die Vorrichtung gemäß Fig. 12a,

Fig. 13a eine seitliche Ansicht der Vorrichtung nachdem der Folienkopf zu einem linken Endbereich der Mantelfläche bewegt wurde,

Fig. 13b eine Draufsicht auf die Vorrichtung gemäß Fig. 13a,

Fig. 14a eine seitliche Ansicht der Vorrichtung beim Aufbringen der Folie auf einen Teilbereich der linken Stirnseite der Produktrolle,

Fig. 14b eine Draufsicht auf die Vorrichtung gemäß Fig. 14a,

Fig. 15a eine seitliche Ansicht der Vorrichtung während des Umwickeln eines linken Endbereichs der Produktrolle, nachdem bereits mehrere Teilbereiche der Stirnfläche abgedeckt wurden,

Fig. 15b eine Draufsicht auf die Vorrichtung gemäß Fig. 15a,

Fig. 16a eine seitliche Ansicht der Vorrichtung nachdem der Folienkopf in die Mitte der Mantelfläche der Produktrolle bewegt wurde,

Fig. 16b eine Draufsicht auf die Vorrichtung gemäß Fig. 16a,

Fig. 17 eine vergrößerte Darstellung des Folienkopfes und der Produktrolle gemäß Fig. 16a,

Fig. 18 eine seitliche Ansicht des Folienkopfes und der Produktrolle gemäß Fig. 17, jedoch mit geschwenktem Folienkopf sowie geschlossenen Klemmzangen,

Fig. 19 eine seitliche Ansicht des Folienkopfes während des Zertrennens der Folie und

Fig. 20 eine seitliche Ansicht des Folienkopfes beim Aufbürsten des abgeschnittenen Folienendes auf die Mantelfläche der Produktrolle.

Further advantages result from the description of an exemplary embodiment. Show it:

1a is a side view of a device for wrapping a product roll in the starting position for packaging a product roll 13,

1b is a side view of a device for wrapping a product roll in the starting position for packaging a product roll 14,

1c is a plan view of a device for wrapping a product roll according to FIGS. 1a and 1b, indicating the pivoting angle of the film head,

2a is a side view of the device during the application of a double-sided tape strip to the beginning of the film,

2b is a plan view of the device of FIG. 2a,

3a is an enlarged front view of the film head during the recording of the tape strip,

3b is an enlarged view of the film head according to the view arrow III in Fig. 3a,

4a is a side view of the device when measuring the product roll diameter,

4b is a plan view of the device of FIG. 4a,

5a is a side view of the device while determining the position in the left end face,

5b is a plan view of the device according to FIG. 5a,

6a is a side view of the device when measuring the position of the right end face,

6b is a plan view of the device according to FIG. 6a,

7a is a side view of the device while the film is stuck onto the outer surface of the product roll,

7b is a plan view of the device according to FIG. 7a,

8a is a side view of the device while the product roll is set in rotation,

8b is a plan view of the device of FIG. 8a,

9a is a side view of the device during wrapping while maintaining the distance A between the outer surface of the product roll and the deflection roll of the film head,

9b is a plan view of the device according to FIG. 9a,

10a is a side view of the device while wrapping a right end portion of the product roll,

10b is a plan view of the device according to FIG. 10a,

11a is a side view of the device when the film is applied to a partial area of the right end face of the product roll,

11b is a plan view of the device of FIG. 11a,

12a shows a side view of the device during the wrapping of a right end region of the product roll after several partial regions of the end face have already been covered,

12b is a plan view of the device according to FIG. 12a,

13a is a side view of the device after the film head has been moved to a left end region of the lateral surface,

13b is a plan view of the device according to FIG. 13a,

14a is a side view of the device when the film is applied to a partial area of the left end face of the product roll,

14b is a plan view of the device according to FIG. 14a,

15a shows a side view of the device during the wrapping of a left end region of the product roll after several partial regions of the end face have already been covered,

15b is a plan view of the device according to FIG. 15a,

16a is a side view of the device after the film head has been moved into the middle of the outer surface of the product roll,

16b is a plan view of the device according to FIG. 16a,

17 is an enlarged view of the film head and the product roll according to FIG. 16a,

18 shows a side view of the film head and the product roll according to FIG. 17, but with the film head pivoted and closed clamping pliers,

Fig. 19 is a side view of the film head during the cutting of the film and

Fig. 20 is a side view of the film head when brushing the cut film end on the outer surface of the product roll.

In the drawings an apparatus for wrapping a Product roll designated as a whole with the reference number 10. Such 1 essentially consists of a device 10 Robot arm 11, a film head 12, two not shown Devices for receiving and driving product rolls 13 and 14, an adhesive device 15 shown in FIG. 2, and one not shown robot controller.

The robot arm 11 has according to FIG. 1 for fixed attachment a foot 16 on the floor, for example also a Attaching the foot 16 to a ceiling or wall is possible. A pivot axis z of the robot arm 11 is on a perpendicular to the central axis M of the product rolls 13, 14 by a Center P of the product rolls 13, 14 straight line y. The Center P is independent of the dimensions of the Product rolls 13, 14 always in the same position to the swivel axis z of the robot arm 11. In this way, the dimensions of the Product roles 13, 14 determined very precisely and then the Packaging can be carried out precisely. Because of this defined Arrangement can be due to lower requirements cheaper controls for the robot arm 11 used become.

The robot arm 11 has the elements 11a, 11b, 11c and 11d on which can be pivoted by means of the joints 17, 18 and 19 are interconnected. By means of these three joints 17, 18, 19, and two further joints 20 and 21, the film head 12 is inside a working area of the robot arm 11 very precisely in any position movable.

The film head 12 is by means of the robot arm 11, as shown in FIGS. 1a to 1c, between the two film rolls 13 and 14 pivotable. During the packaging of a product roll 13 it is like shown in Fig. 1a, possible another already packaged Exchange product roll 14 for an unwrapped, which the Capacity of the device 10 is increased.

3a, b, the film head 12 is shown in more detail. He essentially has two conical bolts 22 Magnetic powder brakes (not shown) for holding and taking along a core, not shown, of the film roll 24, a deflection roll 25, two clamps 26a and 26b, a cutting device 27, one Brush 28 and a distance sensor 29 (see Fig. 5b).

The distance sensor 29 is in a fixed position Deflection roller 25, which a defined withdrawal line L (see Fig. 3b) for provides the film web 37. By the distance sensor 29 the Distance to product roll 13 determined and this data to the Machine control of the robot arm 11 passes on, the The target position of the deflection roller 25 can be calculated. That way it is possible depending on the dimensions of the product rolls 13, 14 one defined distance between the deflection roller 25 and the outer surface 32 of the Product roll 13 and thus a defined free length of the film web 37 observed.

The hanging of the product rolls 13, 14 in the receiving and Drive device takes place in the end regions 30 and 31 Support sleeve are gripped by expansion bolts that engage in the support sleeve and spread out there, so that when the expansion bolts rotate, too the support sleeve together with the product roll 13, 14 is set in rotation.

The packaging process is now carried out as follows:

The film head 12 is first according to FIG Adhesive tape dispenser 15 pivoted. There, as shown in FIGS. 2b and 3a, b shows a strip of double-sided adhesive tape 36 applied longitudinally to the film web 37. It serves during the Gluing the guide roller 25 as an abutment for the film web 37. The film web 37 is meanwhile closed by the Clamping pliers 26a, b kept under tension (see Fig. 3a, b).

4a and 4b, the film head 12 is then in the middle, always parallel to the straight line y, with a certain distance moved up to the product roll 13. From the data supplied by the Distance sensor 29 can the diameter of the product roll 13 and so that the size of the end faces 33, 34 of the product roll 13 is determined become.

The film head moves to measure the product roll 13 12 in a next step parallel to the central axis M via the End face 34 of the product roll 13 in a defined end position and then approaches the end face 34 again until the Position of the end face 34 is found (see Fig. 5a, b). As well the film head also moves to measure the positions of the right End face 33, as can be seen from FIGS. 6a, b.

The film head 12 then moves back in front of the center Product roll 13 and then approaches as in Figures 7a and 7b shown, a lateral surface 32. One with the tape strip 36th 650 mm wide starting area 23 of the film web 37 is glued to the lateral surface 32 by the deflection roller 25 with the adhesive tape strip 36 provided sheet 37 to the Shell surface 32 of the product roll 13 presses. The product roll 13 will then, as shown in Fig. 8a, b, rotated, whereby the Foil web 37 is wound around the product roll 13.

For a defined packaging process, it is necessary to To keep film web 37 under even tension. With decreasing diameter of the film roll 24 increases due to the unwinding lever arm the unwinding resistance. For this The reason is the conical, rotating with the film roll 24 Provide bolts 22 with magnetic powder brakes, not shown, which brake less, the smaller the diameter of the Film roll 24 is and thus a constant tension Ensure film web 37.

So that the packaging process under defined conditions is completely manageable, takes the deflection roller 25 of the film head 12 according to FIG. 9a, b when packing a fixed distance A to Shell surface 32 of the product roll 13. The film head 12 moves at the distance A towards the end face 33, whereby the The outer surface 32 of the product roll 13 is wrapped with the film web 37 becomes. The film head 12 is controlled so that the film web 37 at the edge areas overlapping helically around the Shell surface 32 of the product roll 13 wraps. The film head 12 moves now so far beyond the end face 33 of the product roll 13 that the film web 37 also projects partially beyond the end face 33, such as shown in Fig. 10b.

The film head 12 then swings in the direction of movement 90 ° and moves into an optimal one for wrapping around the end face 33 Position, the film head 12 also closer by means of the joint 19 the end face 33 can be pivoted up. As in Fig. 11a is shown, a portion of the end face 33 with the Foil sheet 37 covered, the sheet 37 so close to one Circumferential surface 35 of the support sleeve region 30 is guided past that no uncovered areas arise. After packing the Part of the end face 33 pivots the film head 12 again 90 ° back so that, according to FIG. 10, the outer surface 38 again with the Foil web 37 is wrapped.

Then, depending on the dimensions of the product roll, 13 the film head 12 automatically several times at certain time intervals by 90 ° between those shown in FIGS. 10 and 11 Positions pivoted so that as described above and in Fig. 12 shown further partial areas of the end face 33 with the film web 37 be provided until the entire end face 33 is tightly packed, the film web 37 collar-like on the peripheral surface 35 of the Support sleeve end 30 is present. The pivoting of the film head 12 takes place automatically by the control of the robot arm 11 calculated time intervals based on the product dimensions and the constant rotation speed of the product roll 13 matched are.

After the end face 33 has been completely packed, it pivots Foil head back into the position for wrapping the outer surface 32 and travels at distance A in the direction of the end face 34 (see Fig. 13a, b). The operations of packaging the end face 33 are now as in FIGS 14 and 15 shown, carried out analogously to the front 34 to wrap. Then the film head 12, the Covering circumferential surface 32, moved centrally in front of the product roll 13 (see Fig. 16). The end faces 33 and 34 as well as the whole The outer surface 32 of the product roll 13 is now with the film web 37 covered.

After complete packaging, the rotation of the product roll 13 stopped and the film head 12 for severing the film web 37 pivoted about the hinge 19, as shown in Fig. 18. The Foil web 37 thereby moves into the effective range of Clamping pliers 26 of the cutting device 27 and the brush 28 Film web 37 is under by closing the clamps 26 The film head 12 is held in tension in the direction of the lateral surface 32 the product roll 13 moves and then the film web 37 by means of of the cutting device 27 (see FIG. 19). Subsequently 20 with the brush 28 under Swiveling the film head 12 brushed onto the surface 32. The film web 37 adheres to the static charge Shell surface 32 of the product roll 13.

The wrapping process of the product roll 13 is now complete, the film head 12 moves away from the surface 32 of the product roll 13 and becomes 180 ° from the robot arm 11 to the product roll 14 pivoted (see Fig. 1c). There can now be another one without waiting Start wrapping while the product roll 13 is off removed from the device and an unpacked product roll in the Recording and drive device can be hung.

Claims (13)

Device for wrapping at least one cylindrical product roll rotatably mounted in a receiving and drive device about a supporting axis, provided with two end faces and a lateral surface, with a plastic stretch film, which is fastened in a rollable manner on a moveable film head which is arranged on a movable carrying device, wherein the device has an automatic, computer-aided position control of the film head, characterized in that the carrying device (11) controlling the film head (12) is pivotably mounted in an unchangeable position in relation to the product roll (13, 14) arranged in the receiving and drive device, that the pivot axis (z) of the carrying device (11) is located on a straight line arranged at right angles to the roll center axis (M) in the region of the roll center point (P), regardless of the size of the product roll (13, 14). Device according to claim 1, characterized in that the film head (12) has a device from which a defined distance between the film head (12) and the lateral surface (32) of the product roll (despite the decreasing diameter of the film roll (24) during the winding process. 14) can be reached. Apparatus according to claim 2, characterized in that the device for creating a defined distance is formed from a deflection roller (25) arranged upstream of the film roll (24) and which provides a defined film withdrawal line (L) during the winding process. Device according to claim 1 or 2, characterized in that the film head (12) has a device which guarantees an essentially constant stretch of the plastic stretch film during the winding process. Apparatus according to claim 2, characterized in that the film roll (24) is arranged on an unwinding device which is provided with a braking device which, depending on the diameter of the film roll (24) decreasing during the wrapping process, the substantially constant elongation of the film web ( 37) brings about. Apparatus according to claim 5, characterized in that the braking device is designed as a magnetic powder brake. Device according to one of the preceding claims, characterized in that the film head (12) has a clamping and cutting device (26, 27) for the film web (37). Apparatus according to claim 7, characterized in that the clamping and cutting device (26, 27) is provided with a pressure device (28) for the film end. Apparatus according to claim 8, characterized in that the pressure device is designed as a brush (28). Device according to one of the preceding claims, characterized in that a device (15) for making available and attaching an adhesive element (36) at the beginning of the film is arranged in the pivoting range of the carrying device (11) of the film head (12). Device according to one of the preceding claims, characterized in that at least two receiving and drive devices are arranged in the machining area of the robot arm. Automatic, computer-assisted process for wrapping a cylindrical product roll, which can be rotated about a supporting axis, has two end faces and a lateral surface, with a plastic stretch film, the film being arranged on a moveable film head, by the following process steps: a) measurement of the length of the product roll and the distance of a defined withdrawal line of the film head to the outer surface of the product roll; b) attaching an adhesive to the beginning of the film; c) attaching the film to the outer surface of the product roll; d) driving the product roll at constant speed; e) moving the film head parallel to a longitudinal central axis of the product roll at least partially beyond a first end region; f) pivoting the film head by 90 ° in the direction of movement; g) after covering a portion of the end face extending up to the axis, pivoting back of the film head; h) then repeating process steps f) and g) a number of times, with different areas of the end face lying against the circumferential surface of the support sleeve being covered up to complete encapsulation; i) moving the film head parallel to the longitudinal central axis of the product at least partially beyond a second end region of the product roll, whereby at the same time the entire surface of the product roll is wrapped; j) carrying out the process steps listed under f), g) and h); k) pivoting the film head into the starting position and moving the film head towards the center of the product roll; l) deceleration of the product roll to a standstill; m) clamping and cutting the film; n) movement of the film head in the immediate vicinity of the lateral surface; o) pressing the film end. A method according to claim 12, characterized in that after the packaging of a product roll, the film head is pivoted to a further receiving and drive device and the packaging process is repeated on a further product roll, during which the already packaged product roll is exchanged for an unpacked product roll.

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