WO2003084816A1

WO2003084816A1 - Method and device for winding a roll, in particular a paper roll with packing material

Info

Publication number: WO2003084816A1
Application number: PCT/EP2003/003145
Authority: WO
Inventors: Ugur Bastas; Krister Lundgren; René Müller; Heinz Schneider; Bo Wigforss; Johnny Wilhelmsson
Original assignee: Lamb Ag Switzerland
Priority date: 2002-04-04
Filing date: 2003-03-26
Publication date: 2003-10-16
Also published as: DE10214939A1; AU2003216888A1

Abstract

According to the invention, a roll (10) may be wound with packing material (16) with two longitudinal edges (18) and a free front transverse edge (20), whereby the roll (10) is mounted with the roller sleeve surface (12) thereof on a roller frame (22). The packing material (16) is fed with the front transverse edge (20) thereof first, tangentially to the roll (10), between the same and the roller frame (22), whilst the roll (10) is rotated about the axis (A) thereof. The packing material (16) is thus drawn between roll (10) and roller frame (22). The packing material (16) emerging behind the roller frame (22) is retained on the roll sleeve surface (12) whilst the roll (10) is further rotated, whereby a surface of the packing material (16) near the front transverse edge (20) which, on winding the roll (10), no longer touches the roller sleeve surface (12), is held in tension by a lifting arrangement. The packing material (16) is pulled tight by the lifting arrangement which is synchronously rotated about the roll (10) in the same direction.

Description

Method and device for wrapping a roll, in particular paper roll, with

packing material

The invention relates to a method and a device for wrapping a roll, in particular a paper roll, with packing material.

Rolls of paper are usually packaged for storage and transportation by wrapping them with packing material - mostly packing paper. This is done in such a way that the roll to be wrapped is supported with its outer surface on a roller mill which has an inlet roller and an outlet roller. The packing material is fed tangentially to the roll between it and the roller mill. According to DE 198 31 277 A, a pressure sensitive adhesive should be applied to an initial area of the packaging material before it gets under the roll so that the packaging material follows when the roll is rotated. The roll is then rotated in a direction of rotation corresponding to the feed direction, thereby taking the packing material between the roll and the roll mill. The bond between the roll and the packaging material caused by the adhesive also holds it against the roll behind the roller mill, so that it can be turned further without the packaging material detaching from the roll. As soon as the first turn of the packaging material around the roll has been completed, the packaging material can be glued into itself or covered with adhesive strips so that it finally holds.

Such an adhesive binding between the beginning of the packaging material and the roll has the disadvantage that when the roll is unpacked, its outer layer, usually in the form of several outer paper turns, is destroyed and must be disposed of separately from the packaging material for appropriate recycling. It can also happen that adhesive residues adhere to the roll and cause malfunctions when they are further processed, for example in a rotary printing press.

DE 30 04470 A discloses a device with which a method according to the preamble of claim 1 can be carried out. To the known device belongs a support frame which is fastened on the outlet side of the roll frame to a foundation be ^¬, engages over the roller mill arcuate and is sized so that a has to be packed paper roll of the largest occurring diameter under the support frame space. A guide belt for packaging material and an application device are arranged on the support frame, which enables the guide belt to be placed on the outer surface of the roll to be packaged and thereby the packaging material press material against the roll. The application device can assume a support position in which it supports a section of the guide belt at a distance from the roll, so that it lifts the guide belt at a specific lifting point from the outer surface of the roll to be packaged. To guide the front end of the packing material around the roll, the application device can be moved along the guide belt in such a way that its lifting point moves around the roll, the guide belt progressively contacting the outer surface of the roll and with the roll rotating and the packing material being fed at the same time this holds tightly against the surface of the roll. In this known device, the adaptation of the guide belt to the diameter of the paper roll to be packaged, which is necessary from case to case, is very complex.

From US 3,593,490 A a device for packing bales of textile material is known, which has two sets of rolls, each with three packing materials, mounted on a height-adjustable frame at a distance from each other. One of these roller sets is arranged on the inlet side and lower than the other roller set which is arranged on the outlet side. A feed conveyor ends at the inlet side, and this is followed by a ramp bridging the roller set on the inlet side, on which the textile bale can roll over the first roller set into the area between the two roller sets. Packing material is drawn off from one of the packaging material rolls of the inlet-side roll set, the free end of which is welded at the start of operation to the free end of the packaging material drawn off from a packaging material roll of the outlet-side roll set, so that a weld seam is formed in the middle between the two roll sets. The textile bale rolled over the ramp comes to a standstill on this, the packaging material loaded in this way being supported in the region of its weld seam on a conveyor belt which begins near the inlet-side roller set and extends outwards below the outlet-side roller set. Each of the roller sets equipped with packing material is assigned guide rollers which are controlled by a linkage supported on the frame and participate in an upward movement of the frame which begins as soon as the textile bale to be packed has reached its rest position on the conveyor belt. During the upward movement of the frame, the strands of packaging material welded to one another are guided upwards by the guide rollers along an inlet or outlet side jacket surface section of the textile bale, then welded together above two parallel weld seams and finally cut through between these weld seams. In this way, one is made up of two half turns set wrapping of the textile bale formed and at the same time ensured that the two strands of packaging material drawn from a packing material roll of the inlet-side and the outlet-side roll set are in turn connected to one another by a weld seam. The packaged textile bale is now conveyed out of the device by means of the conveyor belt, and then the frame, together with both sets of rollers, is lowered back into its starting position, so that the feed conveyor can feed another textile bale for packaging.

The invention is therefore based on the object of designing a method of the type described and an apparatus for carrying out the method in such a way that it is easier to dispense with sticking the packaging material to the outer surface of the roll to be wrapped.

As far as the method is concerned, the object is achieved according to the invention with the features of claim 1, and insofar as it relates to the device with the features of claim 6. Advantageous further developments result from the subclaims.

An embodiment with further details of the invention is explained below with reference to schematic drawings. In it are:

Fig.l to 4 side views of a device for wrapping a roll with packing material in several successive working positions;

5 shows the top view of the device in the working position according to FIG. 2;

6 to 9 a gripper of the device in several working positions;

10 shows an enlarged detail from FIG. 3;

11 shows a simplified side view corresponding to FIG. 1;

12 shows the view in the direction of arrows XII-XII in FIG. 11;

13 shows a side view of a robot belonging to the device;

14 shows the partial top view in the direction of arrow XIV in FIG. 13.

The device shown serves for packaging rolls 10, which can be wound, for example, from printing paper. Each of these rollers 10 has a central axis A, a cylindrical roller surface 12 and two circular end faces 14 normal to axis A. In the direction of its axis A, each individual roller 10 has a width B which can vary within wide limits; in Figure 5 is a roll 10 with the largest occurring width B with full lines, and a roll 10 'with the smallest occurring width B' with dashed lines.

For wrapping a roll 10 in each case, packing material 16, for example packing paper, of width C is used, which is pulled off a supply roll (not shown), has two parallel longitudinal edges 18 and, when packaging each individual roll 10, has a front transverse edge 20 normal to the longitudinal edges 18 starts. FIG. 5 shows that a roll 10 of width B is wrapped in packing material 16 of a significantly larger width C; For a roll 10 'of the smallest occurring width B', packing material 16 'of width C is accordingly provided. In these cases, the packing material 16 or 16 'is arranged in such a way that it protrudes uniformly over both end faces 14 or 14' of the roll 10 or 10 'to be packaged and then after the roll has been wrapped around and after each end cover has been put on the end faces are folded radially inwards and thus come to rest on the end covers. All of this is done in the usual way and is therefore not shown.

The illustrated device for wrapping a roll 10 with packing material 16 each includes a roller mill 22 of a likewise conventional type, which has horizontally mounted rollers parallel to one another, namely an inlet roller 24 and an outlet roller 26, onto which the roller 10 by means of a conveyor, not shown, in is also launched in the usual way. At least one of the rollers 24 and 26 can be driven such that the roller 10 rotates in the direction indicated by an arrow 28, while the packing material 16 is conveyed into the roller gap formed between the roller and the roller mill 22, in FIG to 4 from right to left.

Relatively soft packing material 16 is usually used, which can easily be folded radially in the manner described after the roll has been wrapped. Such packaging material will not in any case reliably run straight and wrinkle-free into the nip between the roller 10 and the roller mill 22 and pass through it. Packing material 16 of some common types must therefore not be left to its own devices but must be guided around the roll 10 until it has formed at least one complete turn. Using the roller 10 itself as the only guiding means is out of the question if, as provided, one should refrain from using an adhesive with which the Packing material 16 is fastened in the region of its front transverse edge 20 to the lateral surface 12 of the roll 10.

For guiding the packing material 16 around the roll 10, two robots 30 are therefore provided in the device shown, which are arranged on a pedestal 32 near the outlet side of the roller mill 22, ie to the left in FIGS. Each robot 30 has a base 34 fastened on the associated pedestal 32, on which a rotating body 36 can be rotated in a numerically controlled manner about a stationary vertical axis D. On the rotating body 36, a boom 38 is pivotable about a first horizontal axis E, also numerically controlled. At the end of the boom 38, a bearing body 40 is pivotable about a second horizontal axis F; this movement is also numerically controlled. In the bearing body 40, an elongated leg 42 is mounted so as to be rotatable about its longitudinal axis G; this adjustability is also numerically controlled. At the end of the leg 42, a gripper joint 44 is formed which defines an axis H of the joint. With the numerical control it can be achieved that the hinge axis H of each of the two robots 30 extends parallel to the axis A of the roll 10 to be encased, regardless of the angular position of the two rotating bodies 36, depending on the width B of the roll 10 to be encased, take in every single case.

At the gripper joint 44 of each of the two robots 30, a gripper arrangement begins with a gripper arm 46, which can be rotated numerically in a controlled manner about the joint axis H, and at the end of which a gripper 48 is arranged. Each gripper 48 has a base part 50 which is pivotably articulated on the associated gripper arm 46 about a tilt axis K parallel to the articulation axis H and is connected to this by a spring 52 which tends to hold the base part 50 in a position in which it is forms a linear continuation of the associated gripper arm 46. Against the resistance of this spring 52, the base part 50 can be tilted backwards against the direction of rotation 28 of the roller 10 and against the normal direction of rotation of the gripper arm 46 which corresponds to it.

The base part 50 contains a pneumatic spring in the form of a piston-cylinder unit, through which a holding part 54 is guided so as to be displaceable along a displacement axis L. The displacement axis L extends parallel to the associated hinge axis H, and the holding part 54 is biased pneumatically in the sense of a displacement away from the adjacent roller end face 14. An abutment 56 is formed on the holding part 54. forms against which a clamping plate 58 can be clamped by means of a pneumatic clamping device 60.

On the inlet side of the roller mill 22, that is to say to the right of this in FIGS. 1 to 5, a packing material guide 62 is provided which has a stationary support 64 for the packing material 16 and a pair of guide plates 66 arranged above it for holding down one of the longitudinal edges 18 of the packing material. 11 and 12, each of the two guide plates 66 is fastened to an arm 68 which, by means of a pneumatic swivel device 70, moves from the working position shown in full lines in FIGS. 1, 11 and 12 to a broken line in FIGS. 11 and 12 indicated ineffective rest position is pivotable.

On the gripper arm 46 of each of the two robots 30, a plurality of pipes 72 are adjustably fastened, which are connected to a vacuum device and each carry one or more suction cups 74, so that the two robots 30 are able to each take up a front cover from a supply and put it on create one of the end faces 14 of the roller 10.

The wrapping of the roll 10 with packing material 16 takes place as follows:

According to Fig.l, the roller 10 is rotated in the direction of arrow 28 and the packaging material 16, guided by the packaging material guide 62, is moved into the nip between the outer surface 12 of the roller 10 and the inlet roller 24 of the roller mill 22. Before the front transverse edge 20 of the packing material 16 is gripped by the inlet roller 24 and clamped between the latter and the roller surface 12, the grippers 48 of the two robots 30 assume the position shown in FIGS. 1 and 6, in which the two grippers 48 each have one of the two longitudinal edges 18 of the packing material 16 projecting laterally beyond the roll 10 near its front transverse edge 20, and then take it in accordance with FIG clamp between the abutment 56 and the clamping plate 58 of the gripper 48 in question.

The two robots 30 are then controlled in such a way that the base parts 50 of the two grippers 48 move away from one another parallel to the axis A of the roller 10, and the aim is to take the associated holding part 54 with them. The pneumatic spring installed in each base part 50 enables the associated holding part 54 to yield a tensile force in the direction of the displacement axis L, that is to say parallel to the roller axis A, on the packing material 16 in the region of its front Applying the transverse edge 20 and thus tensioning the packaging material in such a way that it surely runs wrinkle-free into the nip between roller 10 and infeed roller 24.

At the same time, the two robots 30 are controlled in such a way that each of them grips their gripper joint 44 in an approximately circular movement parallel to the adjacent end face 14 of the roller 10 and also the associated gripper arm 46 begins a rotation about the gripper joint in the direction of arrow 76. These two movements are coordinated with one another in such a way that each of the two grippers 48 executes a circular movement adapted to the diameter of the roller 10. This ensures that the packing material 16 moves smoothly between the roller mill 22 and the roller 10, ie does not get caught between the inlet roller 24 and the outlet roller 26. In the meantime, the guide plates 66, which are no longer required, are moved into their rest position according to FIG.

From the position shown in FIG. 2, the two robots 30 are solely responsible for ensuring that the packaging material 16, starting with its front transverse edge 20, is held against the roll surface 22. The two robots 30 are controlled in such a way that their grippers 48 endeavor to run ahead of the packing material 16. However, since its longitudinal edges 18 cannot slip in the grippers 48, a compensation is created by the tiltability of the base part 50 of each gripper 48 about the associated tilt axis K, the associated spring 52 ensuring that the longitudinal edge pulled forward by the relevant gripper 48 18 of the packing material 16 is kept evenly tensioned without being exposed to the risk of tearing. If one of the base parts 50 tilts too much with respect to the associated gripper arm 46, this is evaluated by means of a sensor as a signal that the movement of the associated robot 30 must be slowed down somewhat. An impermissible excess of tension in the direction of the front transverse edge 20 is prevented by the fact that the holding part 54 of each gripper 48 can yield according to FIG. 9 against the resistance of the associated pneumatic spring.

According to Figure 4, the two robot 30 have reached a position in which the Packma has completed its first turn around the roller 10 ^¬ TERIAL 16 and is introduced again into the roll gap, so that the front transverse edge 20 between the roller 10 and the now beginning second turn of the packaging material 16 is clamped. As soon as this is guaranteed, the two grippers 48 open, so give that Packing material 16 free and are brought into a rest position by rotating the associated rotating body 36 about its vertical axis D. By further turning the roller 10, it receives any number of further turns of the packing material 16. Meanwhile, the gripper arms 46 with their suction cups 74 each grip one of the end caps, not shown, which are mentioned. As soon as the packaging material winding around the outer surface 12 of the roll 10 has been completed and the last winding of packaging material has been fastened to the penultimate one, for example by applying adhesive, the packaging process is continued in the usual manner by applying an end cover to each of the two end faces 14 of the roll 10 will etc.

The above description is based on the prerequisite that can be met in most cases that a wrapping material 16 is used to wrap the roll 10, the width C of which is so much greater than the roll width B that both longitudinal edges 18 of the packing material 16 are sufficiently far beyond the protrude adjacent end face 14 of the roller 10 in order to be gripped by means of one of the grippers 48. However, in the event that this requirement is not met, for example because a protrusion of the packaging material is not desired, the device described can still be used, provided that the packaging material is stiff enough to move between the roll 10 and the device without the aid of a gripping device To be able to move roller mill 22. In such a case, the device described can only begin its working cycle behind the roller mill 22, in that the grippers 48 engage in one of the longitudinal edges 18 of the packaging material 16, approximately in the position shown in FIG.

Instead of two grippers 48, which are each carried and moved by a robot 30, a gripping device working with negative pressure can be used, which takes up a waiting position behind the discharge roller 26 and parallel to it, and for example a suction pipe 78 of the type indicated in FIG. 11 can have suction nozzles 80 pointing upwards in this position. The suction pipe 78 is rotatable about its axis M parallel to the axis A of the roller 10 on one of the two robots 30, or on both, for example on the gripper joints 44 and is, like the grippers 48 described above, around the lateral surface 12 of the Roll 10 guided around, starting approximately in a position corresponding to Figure 2 and ending in a position corresponding to Figure 4. The suction nozzles are always directed radially inwards, towards the roller axis A. The foregoing is intended to clarify that the terms “gripper” and “gripper arrangement” are not limited to means for mechanically clamping the packing material 16. Depending on the nature of the packaging material 16, in addition to detection by negative pressure, detection by electrostatic charging can also be considered.

5641

Claims

claims

1. A method for wrapping a roll (10), esp. Paper roll, with packing material (16), which has two longitudinal edges (18) and a free front transverse edge (20), wherein

- The roll (10) to be wrapped is mounted with its roll surface (12) on a roller mill (22) which has an inlet side and an outlet side,

- The packing material (16), with its front transverse edge (20) ahead, is fed tangentially to the roll (10) between the latter and the roller mill (22) on its inlet side,

- The roller (10) is rotated about its axis (A) in a direction of rotation (28) corresponding to the feed direction, whereby the packing material (16) between the roller (10) and the roller mill (22) is taken to its outlet side,

- The packaging material (16) emerging on the outlet side of the roller mill (22) is still held against the roller surface (12), and

- The roll (10) is rotated further until the roll surface (12) is enveloped by at least one turn of the packing material (16), characterized in that

- A surface of the packing material (16) close to the front transverse edge (20), which will not come into contact with the roll circumferential surface (12) during the subsequent wrapping of the roll (10), is connected in a tensile manner to a driver arrangement,

- The packing material (16) is pulled tight by the driver assembly, and

- The driver arrangement is moved synchronously and in the same direction as the rotation of the roller (10) around it and at the same time is rotated about an axis (H) parallel to its axis (H) such that the driver arrangement has its original orientation with respect to the roller surface (12) maintains on its path of movement extending in the mentioned direction of rotation (28) from the outlet side to the inlet side of the roller mill (22).

2. The method according to claim 1 for wrapping a roll (10) with packing material (16), the longitudinal edges (18) of which protrude axially beyond the roll, characterized in that the longitudinal edges (18) of the packing material (16) already on the inlet side of the roller mill (22) captured by the driver arrangement, from there to the outlet side, and moved further.

3. The method according to claim 2, characterized in that both longitudinal edges (18) of the packaging material (16) are gripped by the driver arrangement and the packaging material (16) is also pulled taut transversely to its longitudinal edges (18).

4. The method according to claim 1, characterized in that the packing material (16) is only detected on the outlet side of the roller mill (22) by the driver arrangement.

5. The method according to claim 4, characterized in that the packing material (16) is sucked in by the driver arrangement while it is at the bottom.

6. Device for wrapping a roll (10), in particular a paper roll, with packing material (16), which has two longitudinal edges (18) and a free front transverse edge (20), comprising:

- A roller mill (22) with an inlet side and an outlet side, on which an inlet roller (24) or an outlet roller (26) are arranged, on which the roller (10) with its outer surface (12) is supported and about its axis ( A) can rotate, and

- A packing material guide (62) through which the packing material (16) can be fed tangentially to the roller (10) from the inlet side between the latter and the inlet roller (24), characterized in that

- The roller mill (22) is arranged adjacent to at least one robot (30) which carries a driver arrangement and is able to move it from the outlet side around the roller (10) to the inlet side of the roller mill (22), and

- The driver arrangement is designed to a transverse edge (20) close surface of the packing material (16), which does not come into contact with the roll surface (12) during the subsequent wrapping of the roll (10), to detect tensile force.

7. The device according to claim 6, characterized in that

two robots (30) each have a gripper joint (44) that can rotate at an adjustable distance parallel to each end face (14) of the roller (10) about its axis (A),

- On each gripper joint (44), a gripper arm (46) as a component of the driver arrangement is mounted such that it can be driven in rotation about an articulation axis (H) parallel to the axis (A) of the roller (10), and - Each gripper arm (46) carries a gripper (48) capable of gripping the packing material (16) on one of its longitudinal edges (18).

8. The device according to claim 7, characterized in that the gripper (48) at least one of the two robots (30) with the associated gripper arm (46) about an axis (A) of the roller (10) parallel axis (K) resilient is pivotally connected.

9. The device according to claim 7 or 8, characterized in that each gripper arm (46) additionally carries a device (72, 74) with which it is able to take up an end cover and to apply to an end face (14) of the roller (10).

10. The device according to claim 6, characterized in that the driver arrangement has a suction tube (76) carried by at least one robot (30) and adjustable parallel to the axis (A) of the roller (10), said suction tube (76) on the outlet side of the roller mill (22) the packaging material (16) emerging from this can suck.

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