EP3038962A1

EP3038962A1 - Device for automatically unwinding web-shaped materials and method for operating such a device

Info

Publication number: EP3038962A1
Application number: EP14725167.2A
Authority: EP
Inventors: Jesus López Marin
Original assignee: PSA Technology Sarl
Current assignee: PSA Technology Sarl
Priority date: 2013-08-30
Filing date: 2014-05-20
Publication date: 2016-07-06
Anticipated expiration: 2034-05-20
Also published as: DE102013109427B4; EP3038962B1; US20160207727A1; US10005636B2; DE102013109427A1; WO2015028159A1

Abstract

The invention relates to a device for automatically unwinding web-shaped materials (8) from a parent roll (3) and to a method for operating such a device. The device comprises an input arm (2) and a first drive unit (6), wherein the parent roll (3) is rotatably supported on the input arm (2) by means of a winding core (4) of the parent roll and the first drive unit (6) serves to apply a driving force to the parent roll (3). In order to achieve high productivity, the unwinder (1) has a removal arm (13), with which a second drive unit (14) for applying a driving force to the parent roll (3) is associated, wherein the parent roll (3) can be transferred from the input arm (2) onto the removal arm (13) during an unwinding process. The material web (8) is then unwound from the parent roll (3) supported on the input arm (2) down to a specifiable minimum diameter, wherein the parent roll (3) is then transferred onto the removal arm (13) during the ongoing unwinding process and is actively unwound further there, wherein a new parent roll (3') is received by the input arm (2). Thus, uninterrupted unwinding is enabled.

Description

Apparatus for automatic unwinding of sheet-like materials and method for operating such a device

The invention relates to a device for the automatic unwinding of sheet-like materials according to the preamble of claim 1, which will be referred to as unwinders, and a method of operating such a device according to claim 8. Such devices or unwinders are used, for example, in the production of sheetlike Materials used. The web is wound following a production line with a winder on a winding core to a parent roll. The mother roll has relatively large dimensions, for example, a diameter of 2 m and more and a web width of more than 2 m.

The finished wound parent rolls are first buffered in a transfer area, which thus serves as a buffer. After that, the mother roll will be offline with help a unwinding unwound and assembled, for example, in a downstream cutting system according to customer requirements.

Due to the offline operation of the cutting machine with the device for automatic unwinding, ie the unwinder, the production line can run for a limited time at a higher production speed than the cutting machine. The necessary replacement of parent rolls in the unwinder results in downtimes. In this case, one end of the web of the new parent roll to the downstream cutting system must be performed by the unwinder after removing the winding core of the unwound parent roll. This requires the intervention of at least one operator, involves a certain susceptibility to errors and leads to downtime. Since an exchange of the parent roll must take place every few hours, these downtimes negatively affect the efficiency of the entire system. It is an object of the invention to provide an apparatus and method for efficient operation. In particular, downtime should be minimized when changing the parent role or even completely eliminated.

According to the invention, this object is achieved by a device having the features of claim 1 or by a method having the features of claim 8. Advantageous embodiments can be found in the subclaims.

In an apparatus for automatically unwinding a web from a master roll having an input arm and at least one first drive unit, wherein the parent roll is rotatably mountable on the input arm with its winding core and a drive force can be introduced into the parent roll with the drive unit, the invention provides the unwinder has a removal arm to which at least one second drive unit is assigned for introducing a drive force into the parent roll, wherein the parent roll can be transferred from the input arm to the removal arm during an unwinding operation.

In such an unwinder, the master roll can be stored both on the input arm and on the removal arm and actively handled by the first or second drive unit. During the unwinding of the input arm, on which it is rotatably mounted at the beginning of the unwinding process, the mother roll is initially only engaged by the first Drive unit rotated and then passed to the removal arm. At the removal arm, the parent roll is also rotatably mounted and can be further developed there, wherein the necessary for a rotation of the mother roll driving force is introduced by the second drive unit. In this case, the master roll can be uninterrupted unwound during the transfer from the input arm to the removal arm, for example, by the first drive unit continues to drive the parent roll until the second drive unit takes over the drive task. The input arm and the removal arm are in particular pivotally mounted. While the master roll is unwound on the picker arm and driven by the second drive unit, the input arm may already be pivoted and receive a new parent roll prepared for unwinding. Accordingly, the unwinder according to the invention enables uninterrupted processing without having to be shut down for a change of parent rolls. This increases throughput and efficiency of the system.

In a preferred development, the device has a pressure roller, which can be applied to a circumference of the mother roller, in particular mounted on the input arm, wherein the web is guided away from the master roll via the pressure roller and adapted at a displacement of the parent roll and thus a displacement of its axis of rotation can be. The pressure roller is pivotally mounted in particular on an arm and arranged for example below the mother roll. The pressure roller does not necessarily have to be strictly cylindrical in shape, but can also be formed, for example, by a circulating belt or the like.

Preferably, the first drive unit on the input arm and / or the second drive unit on the removal arm is designed in particular as a winding shaft drive mounted on the front side. With the help of such a winding shaft drive, the winding core of the mother roll can be driven directly in the center. Optionally, it may also be provided to provide a winding shaft drive on each end face. This makes it possible to set the parent roll in rotation, without making contact with the web and to burden the web with a driving force.

Alternatively or additionally, it can be provided that the first drive unit is formed on the input arm as a first drive rocker and / or the second drive unit on the removal arm as a second drive rocker. A drive rocker can be applied by swiveling to a circumference of the parent roll and can thus provide a driving force for rotating ren of the mother roll and thus bring to unwind the web. Since the drive rocker is applied to the circumference of the parent roll, it is control technology very easy to keep a winding speed constant. The first drive rocker is arranged in particular above the mother roll, wherein the web is unwound down from mother roll.

Preferably, the first drive rocker and / or the second drive rocker on one or more belt drives. A belt drive can comprise one or more belts. A belt drive can be applied over a relatively large area to the circumference of the parent roll and thus cause a good power transmission. Therefore, the web can also consist of relatively sensitive materials.

The first drive rocker can be applied in particular from above to the parent roll. A pivot point of the drive rocker may in particular lie above a movement path of the pivot point of the parent roll. The second drive rocker is then below the first drive rocker, as it comes only at a caused by the unwinding reduced diameter of the mother roll used. In this case, the second drive rocker is brought in particular laterally or from above to the mother roll when it is transferred to the removal arm or has been.

In a preferred embodiment, the unwinder on a cutting device, which is designed in particular as a Kappmesser with backbone. With this cutting device, the web can be severed transversely to the web running direction, so that a remainder of the web can remain on the otherwise unwound winding core. In particular, the cutting device acts on the web between the removal arm or the parent roll mounted on the removal arm and the pressure roller. The cut of the web can then be placed in areas that can be relatively easily fed to a committee. For example, it is thus avoided that such a cut lies within a ready-made roll.

The unwinder preferably has a roll-laying stand, from which a newly provided mother roll can be received by the removal arm. The new mother roll is made available on the roll rack stand, while the previous parent roll is still unwound. The new mother role comes from the transfer area or buffer, avoiding waiting for a new parent role, which would disrupt the unwinding process.

Advantageously, the device has a removal device with which the unwound winding core can be removed from the removal arm. The winding core need not be completely unwound, but may for example still have some windings of the web. The removal device can transport the winding core away, for example, upwards or laterally from the removal arm. The object is achieved by a method for operating a device for automatically unwinding a web from a mother roll according to the invention that the web is unwound from the stored on the input arm mother roll to a predetermined minimum diameter, the mother roll then during unwinding process to the removal arm passed on and further processed there, wherein the input arm a new mother role is included. Thus, there is a continuous operation of the unwinder. It may optionally be provided to adjust the winding speed during the transfer from the input arm to the removal arm and / or when starting the winding process with a new parent roll. Both during storage of the parent roll on the removal arm and on the input arm, the parent roll can be actively handled, that are each driven via at least one drive unit. This allows continuous unwinding in both positions.

For transferring the master roll, the input arm and the removal arm are preferably moved toward one another, wherein in particular a drive via the first drive rocker takes place at least until the parent roll is mounted on the removal arm and is driven by the second drive unit. It can be provided to move only the input arm and keep the removal arm immobile. In a preferred embodiment, one end of the web, which is unwound from the stored on the removal arm and in particular driven mother roll, at a beginning of the stored on the input arm and driven new mother role ipsple, in particular for the stored on the removal arm mother roll incoming web is pressed with a pressure roller to the circumference of the new parent roll. The end of the web on the nearly completed So terrolle is connected to the beginning or the outer winding layer of the web on the new mother roll. This process is simplified, for example, by using a double-sided adhesive tape. In this case, there is a relatively large, solid compound by using the pressure roller, a corresponding contact pressure is applied. A threading of a new beginning of a web is thus not necessary, but can be a continuous operation. This also allows complete automation without the intervention of an operator. When the webs are pressed against one another with the aid of the pressure roller, due to the simultaneous driving of both parent rolls, no relative speed and therefore no friction occur.

Features and advantages described in the context of the scheduler are transferable to the method in an analogous manner. The same applies to features and advantages described in connection with the method.

The invention will be described in more detail below with reference to a preferred embodiment in conjunction with the drawings. Herein show:

1 to 9 a side view of an apparatus for automatically unwinding a web at different times during a unwinding process.

In the figures, a device for the automatic unwinding of a web, so an unwinder 1 is shown schematically in side view, which has an input arm 2, on which a mother roll 3 is rotatably mounted with a winding core 4. On the winding core 4, a web is wound, for example, nonwoven material. The parent roll 3 is removed, for example, from a buffer or transfer area of a nonwoven production plant and transferred to the input arm 2. For the transfer, a roll storage stand 5 is provided, on which a new mother roll can be kept in a waiting position until it is taken over by the input arm 2.

To generate the rotation of the master roll 3 serves as a first drive rocker formed first drive unit 6, which is arranged above the mother roll 3 and the input arm 2. The first drive rocker 6 has one or more belt drives 7 and is applied to a circumference of the parent roll 3 to a in To transmit circumferentially directed force. This is an unwinding of the mother roll 3, wherein the web 8 is guided via a pressure roller 9 and a guide roller 10, for example, to a downstream cutting system or other processing plant. In addition, it can be provided for driving the mother roll 3 to provide a winding shaft drive as a center drive, which is mounted for example on the input arm and acts directly on the winding core 4. However, this is not shown in the figures.

The pressure roller 9 is pivotally mounted on an arm 1 1 and in particular to the periphery of the mother roll 3 can be pressed. The input arm 2 is mounted pivotably, wherein a trajectory 12 of a rotation axis of the parent roll 3 is shown in dashed lines.

The unwinder 1 further comprises a removal arm 13 which is pivotally mounted. The mother roll 3 can be transferred from the input arm 2 to the removal arm 13, which are pivoted toward each other. The removal arm 13 is associated with a second formed as a second drive rocker drive unit 14, which is then applied to the periphery of the parent roll 3, when the mother roll 3 is mounted on the removal arm 13. Accordingly, it is possible to actively process the parent roll continuously, regardless of whether it is mounted on the input arm 2 or on the removal arm 13. Like the first drive rocker 6, the second drive rocker 14 can also have one or more belt drives.

1 shows an already unwound winding core 4 ', which is transported away from the unwinder 1 by means of a removal device (not shown).

For severing the web, the unwinder 1 has a cutting device with a Kappmesser 15 and a counter-strike bar 16. Thus, the web is severed transversely to the web running direction when the mother roll is mounted on the removal arm 13. The cut is then made between the parent roll 3 mounted on the removal arm 13 and the pressure roll 9.

Starting from Figure 1, the operation of the unwinder will now be described in more detail. In Figure 1 is a mother roll 3 on the input arm 2. The first drive rocker 6 is brought to the periphery of the mother roll 3 and the web 8 is unwound via the pressure roller 9 and the guide roller 10 and fed to a cutting unit, not shown. After a diameter of the mother roll has been correspondingly reduced by the unwinding of the mother roll, so that sufficient space is available, a new master roll 3 ^{'is provided} on the roll-laying stand 5 (FIG. 2). In this case, both the input arm 2 and the first drive rocker 6 has already been pivoted in the direction of the removal arm 13 in order to increase the available space.

In Figure 3, the time is now shown, in which the mother roll 3 is taken over by the removal arm 13. For this, the removal arm 13 engages overhanging ends of the winding core 4 and takes over the mother roll 3, without interrupting a rotation of the mother roll 3. The drive of the parent roll 3 is taken over by the second drive rocker 14, which is assigned to the removal arm 13. Optionally, both the first drive rocker 6 and the second drive rocker 14 may abut briefly on the circumference of the parent roll to ensure a steady transition.

In FIG. 4, the master roll 3 is held solely by the removal arm 13 and is driven by the second drive rocker 14, wherein the withdrawal of the material web 8 continues via the pressure roll 9 and the deflection roll 10. The input arm 2 is pivoted in the direction roll stand 5 to accommodate a new master roll 3 '. The first drive rocker 6 has been pivoted upwardly to allow the introduction of the new master roll 3 in an unwinding position. This is shown in FIG. The new mother roll 3 'is ready to participate in the unwinding process. Still, however, the web is unwound from the previous mother roll 3.

FIG. 6 now shows the beginning of a splicing process in which the material web coming from the parent roll 3 mounted on the removal arm 13 is spliced to the fabric web located on the new mother roll 3 '. This is done with the help of the pressure roller 9, which presses the webs together and generates the pressure forces required for the formation of the splice. At the same time, the cutting device is prepared with the Kappmesser 15 and the counter-ledge 16 to produce a section through the web. FIG. 7 now shows the actual splicing process, with an initially two-ply material web being taken off after the pressure roller 9.

FIG. 8 shows how the product web coming from the previous mother roll 3 is severed by the cutting knife 15. Accordingly, the master roll 3 is finished unwound and, as shown in Figure 9, can be removed. A beginning of the wound on the new master roll 3 'web is automatically removed via the pressure roller 9 and the guide roller 10, without any interruption. The unwinder is in the same position as shown in FIG. Accordingly, a new development cycle begins.

By the method according to the invention or the device according to the invention a non-stop processing is possible. It is provided to perform an active unwinding of the parent roll by corresponding drive units both on the unloading arm and on the input arm, ie to use both positions for unwinding. This results in a significant increase in efficiency, especially in off-line systems, such as those used in nonwoven fabric production. Downtimes that were previously required due to the replacement of the parent roll, can be completely eliminated. In addition, complete automation is possible.

The invention is not limited to one of the above-described embodiments, but can be modified in many ways.

All of the claims, the description and the drawings resulting features and advantages, including design details, spatial arrangements and method steps may be essential to the invention both in itself and in various combinations. Reference numeral left

1 unwinder

2 input arm

3 mother role

3 'new mother role

4 winding core

4 'unwound hub

5 roll rack stand

6 first drive unit / first drive rocker

7 belt drive

8 web

9 pressure roller

10 guide roller

1 1 arm

12 trajectory

13 extraction arm

14 second drive unit / second drive rocker

15 cutting knife

16 counter-strike bar

Claims

claims

Device for automatically unwinding a web (8) from a master roll (3), with an input arm (2) and at least one first drive unit (6), wherein the parent roll (3) can be mounted rotatably on the input arm (2) with its winding core (4) and with the drive unit (6) a driving force in the parent roll (3) can be introduced, characterized in that the unwinder (1) has a removal arm (13), the at least one second drive unit (14) for introducing a driving force into the mother roll (3) is assigned, wherein the parent roll (3) during a unwinding from the input arm (2) to the removal arm (13) can be transferred.

Unwinder according to claim 1, characterized in that it has a pressure roller (9) which can be applied to a circumference of the input arm (2) mounted mother roll (3, 3 ^' ), wherein the web (8) via the pressure roller (9) away from the parent roll (3, 3 ^' ).

Unwinder according to claim 1 or 2, characterized in that the first drive unit (6) on the input arm (2) and / or the second drive unit (14) on the removal arm (13) is designed as a particular end-mounted winding shaft drive.

Unwinder according to one of the preceding claims, characterized in that the first drive unit (6) on the input arm (2) as the first drive rocker and / or the second drive unit (14) on the removal arm (13) is designed as a second drive rocker.

Unwinder according to claim 4, characterized in that the first drive rocker (9) and / or the second drive rocker (14) one or more belt drives (7).

Unwinder according to one of the preceding claims, characterized in that it comprises a cutting device which is designed in particular as Kappmesser (15) with counter-rebate strip (16).

7. unwinder according to one of the preceding claims, characterized in that it comprises a roll-depositing stand (5) from which the parent roll (3,3 ^' ) by the input arm (2) is receivable. 8. unwinder according to one of the preceding claims, characterized in that it comprises a removal device with which the unwound winding core (4 ^' ) from the removal arm (13) is removable.

9. A method for operating a device having the features of one of the preceding claims, characterized in that the web (8) from the on the input arm (2) mounted mother roll (3) is unwound to a predetermined minimum diameter, wherein the parent roll (3) is then transferred to the removal arm (13) during the unwinding process, where it continues to be unwound, a new parent roll (3 ^' ) being received by the input arm (2).

10. The method according to claim 9, characterized in that for the transfer of the mother roll (3) of the input arm (2) on the removal arm (13) are moved towards or towards each other, wherein in particular a drive via the first drive unit (6) takes place at least as long until the master roll (3) is driven by the second drive unit (14).

1 1. A method according to claim 9 or 10, characterized in that one end of the web (8), which is unwound from the on the removal arm (13) mounted and driven mother roll (3), to a beginning of the on the input arm (2) and driven new mother roll (3 ^' ) is spliced, for which in particular from the on the removal arm (13) mounted mother roll (3) coming web is pressed with a pressure roller (9) to the periphery of the new mother roll (3 ^' ).