EP1798172A2 - Device and method for unwinding a material web - Google Patents

Abstract

There are two unwinding positions where the web (6, 14) is taken from the roll (3, 4) in succession. The web is unwound by first and second drives successively, in these positions. The first drive has greater torque than the second. The first drive comprises a motor connected through a gear to the roll. The second drive enables greater speed than the first. Between the positions, equipment for suction, parting and/or splicing (7, 16) the web is provided. The two unwinding positions are arranged in succession, in the running direction of the web. An independent claim is included for the corresponding method.

Description

The invention relates to a device for unwinding a material web, in particular a paper or board web, from a roll, in particular for subsequent cutting in the longitudinal direction and for subsequent winding on a plurality of adjacent shipping rolls.

Furthermore, the invention also relates to a method for unwinding a material web, in particular a paper or board web from a roll, in particular for subsequent cutting in the longitudinal direction and for subsequent winding on a plurality of adjacent shipping rolls.

Such a device is known in the art and is used for unwinding a material web, which is then cut by one or more cutting devices in the longitudinal direction and divided into individual webs, to then be wound on cores to so-called mailing rolls. For this purpose, for example Stützdrehzen- or support rollers winding machines. Carrier roll winding machines have two driven carrier rolls, on which the winding rolls rest during winding next to each other with aligned sleeves. The carrier roll winding machines have a roll ejecting device which ejects a set of finished wound rolls from the roll bed formed by the two support rollers in a roll change. The finished set of bobbins is doing from the ejection device on the vertex of a support roller away on a Lowering platform pressed.

In apparatuses for unwinding a material web, as known from the prior art, in order to maintain the web tension required for the operation of the material web, the winding drum, i. H. the winding roll, regeneratively braked.

Especially with large bobbins this leads to high installed capacities. When the roll is full, a big moment has to be applied; at small diameters of bobbins high speeds arise to maintain the same web speed of the unwinding web. On the other hand, high drive torque and high speeds do not occur simultaneously. Nevertheless, a generator must be installed, which is able to apply both the high speeds and the high torques. Sometimes a transmission with fixed reduction between the generator and the drum is switched on.

It is the object of the invention to provide both an improved apparatus and an improved method of unwinding the web.

According to the invention, this object is achieved in a device of the type mentioned above in that the device has a first and a second unwinding in which the web is successively unwound from the roll, wherein the web in the first unwinding position by a first drive and in the second unwinding by a second drive from the winding roll can be unwound. The invention makes it unnecessary to install a high drive power; At the same time, costs can be saved.

Advantageous developments emerge from the subclaims, the description and the drawings.

An advantage is a device in which the first drive in relation to the second Drive allows high torque. Additionally or alternatively, it may be provided that the first drive comprises a motor and a gearbox interposed between the motor and the winding roller at the first unwinding position. As the diameter of the winding roll decreases, the transmission can shift to a lower gear stage. If the diameter of the winding roll or the drum has been reduced so that it can be taken over by the motor, which is arranged regularly at the second unwinding position, then this is engaged at the other end of the winding roll. The switching between the two motors is preferably carried out during the set change; ie, when a set of shipping rolls is finished wound from the strips of unwound web.

Preferably, the second drive allows a high speed in relation to the first drive.

Advantageously, means for sucking, separating and / or splicing the web in the area between the two unwinding positions can be installed.

It is also advantageous if the two unwinding positions are arranged one behind the other in the web running direction.

According to the invention, the method is characterized in that the material web from the roll, as long as it still has the full circumference or a large circumference, is unwound at the first unwinding position by a first drive with a high torque or with a gear, and that the material web, as soon as the circumference of the roller has reduced to a predetermined maximum extent, it is unwound at the second unwinding position by a drive with a small torque.

In an advantageous embodiment of the method, it is provided that the second drive is moved from the second position to the first position as soon as a roller present in the first position is completely unwound.

It is also advantageous if the second drive is coupled to the shaft of the roller opposite the first drive in the first unwinding position. As a result, the conditions are created for, after the first drive is uncoupled from the roll, the second drive serves as a drive.

Furthermore, it is advantageously provided that the roller, after it has been unwound to the predetermined circumference, is moved together with the second drive to the second unwinding position and is unwound therefrom to the end.

It is also advantageous that, while the roll is moved to the second unwinding position, a new roll is inserted at the first unwinding position, coupled to the first drive with a coupling in the region of a bearing mounted on a shaft journal, and then up to the predetermined one Scope is handled.

In addition, it is advantageously provided that, when the end of the material web to be unwound from the roll in the second unwinding position is reached, it is joined by splicing by means of at least one adhesive strip or glue with the material web to be unwound from the roll in the first unwinding position. Overall, the spool change is accelerated by the invention.

The invention will be explained in more detail in an embodiment with reference to the drawings.

Fig. 1a-Fig. 5b

jeweils Draufsichten und zugehörige stirnseitige Ansichten einer Vorrichtung mit zwei Abwickelpositionen zum Abwickeln einer Rolle einer Materialbahn in verschiedenen

Stadien des Abwickelvorgangs.Show it

Fig. 1a-Fig. 5b

each plan views and associated end views of a device with two unwinding positions for unwinding a roll of a web in different

Stages of the unwinding process.

In a device with two winding positions 1, 2 (FIG. 1a, b) for unwinding reels 3, 4, a material web 6 is unwound during the unwinding process from the full winding reel 3 at the first unwinding position 2 by a first drive 5. In this case, the material web 6 is guided past a splicing device 7.

The winding rollers 3, 4 are respectively via bearings 8, 9 and 10, 11 at least substantially in one plane on a support device 12th

Simultaneously with the still full winding roll 3 (full tambour, "mother roll"), the winding roll 4, which is already substantially unwound, unwound in the winding position 2 by a second drive 13 to the end of a web 14, via a guide roller 15 and a splicer 16 is passed over.

The second drive 13 is dimensioned by its power so that its drive motor for generating a small torque just sufficient to allow the remaining processing of the web 14 of the winding roller 4 in the unwinding position 2. In contrast to the second drive 13, the first drive 5 is dimensioned such that its torque is sufficient to unwind the material web 6 from the still full winding roller 3. The winding roll 3 is usually at least as long unwound by the first drive 5 until the first set of shipping rolls (finished rolls) has arisen.

The first drive 5 may include a motor and a switched between the winding roll and the engine gear instead of a high torque motor having two or more switching stages and switches depending on the diameter of the winding roll in the corresponding switching stage, so that the engine always is loaded with an approximately equal load by the torque of the winding roll.

In a further step (FIG. 2 a, b), just before the material web 14 is unwound from the winding roll 4, it is separated by a separating or cutting device (not shown) around an end 17 of the material web 14 with a beginning 18 connect the web 6. This is therefore guided by the splicing device 7 in the direction of an arrow 19 in the vicinity of the splicing device 16 and connected by means of at least one adhesive strip or glue with the material web 14. As a result, the winding roller 4 is now ready to be lifted out of the unwinding position 2.

In the next step (FIG. 3 a, b), first of all the second drive 13 is pulled out of a coupling, which is arranged in the region of the bearing 11. The second drive 13 is moved in the direction of an arrow 20 to the winding roller 3 in the unwinding position 2; There he is coupled together via an integrated coupling in the region of the bearing 9 with the winding roller 3. Then, the winding roller 4 is removed from the unwinding position 2 in the direction of an arrow 21. However, this is still driven by the first drive 5, as required according to the winding circumference of the winding roll 3.

After the second drive 13 is engaged in the direction of an arrow 22 (FIG. 4a, b) in a coupling of the winding reel 3 arranged in or near the bearing 9 in the region of the winding position 1 and after the second drive 13 has begun, the winding reel 3, the first drive 5 is disengaged from a clutch arranged in the region of the bearing 8 in the direction of an arrow 23. Then, while being simultaneously driven by the second drive 13, the winding roll 3 is moved together with it in the direction of an arrow 24 to the position 2. At the same time, the splicing device 7 is moved back in the direction of an arrow 25 to its original position below the winding position 1.

Subsequently, the winding roller 3 by the second drive 13 in the winding position 2 (Fig. 5a, b), in which originally the winding roller 4 was found had finished, finished. Meanwhile, a new winding roll 26 is brought in the direction of arrow 27 in the winding position 1, in which previously had the winding roll 3, and the first drive 5 is engaged. Subsequently, the same unwinding processes proceed as previously described.

Of course, in addition to the known unwinding process described above, additional unwinding operations can be realized with the device. Such a supplementary unwinding process is present, for example, when the system is to be restarted after a prolonged maintenance shutdown. Of course, FIGS. 1a to 5b can be used for a better description thereof.

In the unwinding position 1, a new Volltambour ("mother role") is inserted. For the sake of simplicity, we assume that a total of two finished roll rolls ("shipping roll") can be produced from this full-bodied roll. The operator now pulls the provided with a "tip" path from the parent roll, which has been set to motor by a first drive 5 in rotation, and leads them in a known manner semiautomatic through the entire system to the winding station. There it is, as soon as they have been divided into single tracks due to prior activation of the cutting section, attached to the lying in the winding bed sleeve set. Now, the actual production process can start, in which the individual webs under train - the first drive 5 works for this purpose as a generator - wrapped around the sleeves.

The unwinding position 2 is initially empty. Now that the first roll of shipping rolls has been finished, a first change of set takes place, ie the single sheets are separated, the litter is ejected and the new web starts are fastened to a new set of tubes.

After the set change-related standstill, the production of the second dispatch roll throw is recorded. The web material for this set comes still from the parent roll stored in the unwinding position 1. Meanwhile, the second unwinding position 2 is still empty.

In the course of the second change of set - ie at standstill of the system - is now the second drive 13, which has been previously moved to a position in which it is aligned with the center axis of the first mother roll 3 in the first unwinding position 1, with the "rest" Mother roll 3 coupled. Then, the first drive 5 is disengaged. Subsequently, the "residual" mother roll 3 is transferred together with the second drive 13 from its previous unwinding position 1 in the second unwinding position 2. Once that's done, then "the production of the second dispatch roll design starts". The first unwinding position 1 is initially free.

While the second roll of mailing rolls is being wound, the operator feeds the uncoiled first unwinding position 1 with a new master roll and prepares it for the subsequent splicing operation. Since this preparation takes place while the machine is running, the previously customary is clearly abbreviated - an advantage that might be further highlighted in the description. Now, if the second dispatch roll design almost finished wound and the original mother role accordingly almost empty, so the remaining track of the old mother roll is connected in a known manner with the path of the new full cylinder. The third finished rolling draft is therefore based on web material of the new, stored in unwinding position 1 Volltambours. In the following episode, the above-mentioned processes are of course repeated again and again.

LIST OF REFERENCE NUMBERS

1

winding position

2

winding position

3

reel

4

reel

5

First drive

6

web

7

splicer

8th

camp

9

camp

10

camp

11

camp

12

carrying device

13

Second drive

14

web

15

deflecting

16

splicer

17

The End

18

Beginning

19

arrow

20

arrow

21

arrow

22

arrow

23

arrow

24

arrow

25

arrow

26

reel

27

arrow

Claims (13)

Device for unwinding a material web (6, 14), in particular a paper or board web, from a winding roll (3, 4), in particular for subsequent cutting in the longitudinal direction and for subsequent winding onto a plurality of adjacent mailing rolls,
characterized,
in that the device has a first and a second unwinding position (1, 2) in which the material web (6, 14) can be unwound successively from the winding reel (3, 4), wherein the material web (6, 14) in the first unwinding position ( 1) by a first drive (5) and in the second unwinding position (2) by a second drive (13) of the winding roller (3, 4) is unwound. Device according to claim 1,
characterized,
in that the first drive (5) allows a high torque in relation to the second drive (13). Apparatus according to claim 1 or 2,
characterized,
in that the first drive (5) comprises a motor and a transmission interposed between the motor and the winding roller (3) at the first unwinding position (1). Device according to one of claims 1 to 3,
characterized,
in that the second drive (13) enables a high speed in relation to the first drive (5). Device according to one of claims 1 to 4,
characterized,
in that means for sucking, separating and / or splicing (7, 16) the material web (6, 14) are present in the region between the first (1) and the second unwinding position (2). Device according to one of claims 1 to 5,
characterized,
that the two unwinding positions (1, 2) are arranged in the web running direction behind the other. Method for unwinding a material web (14), in particular a paper or board web, from a winding roll (3, 4), in particular for subsequent cutting in the longitudinal direction and for subsequent winding onto a plurality of adjacent mailing rolls,
characterized,
that the material web (6, 14) from the winding roll (3), as long as it still has the full circumference or a large circumference, unwound at the first unwinding position (1) by a first drive (5) with a high torque or with a gear is, and that the web (6, 14), as soon as the circumference of the winding roll (3) has reduced to a predetermined maximum extent, at the second unwinding position (2) by a second drive (13) with a small torque is unwound. Method according to claim 7,
characterized,
in that the second drive (13) moves from the second position (2) to the first position (1) is moved as soon as an existing in the first position (1) winding roller (3) is completely unwound. Method according to claim 7 or 8,
characterized,
in that the second drive (13) is coupled to the shaft journal of the winding roller (3) opposite the first drive (5) in the first unwinding position (1). Method according to claim 8 or 9,
characterized,
in that the first drive (5) is decoupled from the winding roller (3) as soon as the second drive (13) is coupled. Method according to claim 10,
characterized,
that the winding roller (3), after it has been unwound to the predetermined circumference, is moved together with the second drive (13) to the second unwinding position (2) and is unwound from the latter to the end. Method according to claim 11,
characterized,
in that , while the winding roll (3) is moved to the second unwinding position (2), a new winding roll (26) is inserted at the first unwinding position (1) and coupled with one of its shaft journals to the first drive (5) and then up to is handled to the specified extent. Method according to one of claims 7 to 12,
characterized,
that when the end of the winding roll (3) in the second Unwinding position (2) unwinding material web (6, 14) is achieved, this is connected by splicing by means of at least one adhesive strip or glue to the unwound from the winding roll (26) in the first unwinding position (1) web (6, 14).

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