EP3157850B1 - Holding and unrolling device for flat and/or film material wound on rolls, container packaging system, and method for switching a roll with flat and/or film material - Google Patents

Description

The present invention relates to a holding and unrolling device for roll-wound flat and / or sheet material with the features of independent claim 1. Furthermore, the invention relates to a container packaging plant according to claim 11. Furthermore, the invention relates to a method for changing a roll wound thereon Flat and / or sheet material within a holding and unwinding device with the features of independent method claim 12.

When packaging objects in a packaging machine, it is necessary to supply a consumable material or a flat or sheet material from a so-called storage unit. The storage unit comprises, for example, a roll containing the wound flat or sheet material. The roll is rotatably provided by a holding device disposed in the packaging machine such that during packaging of the articles the sheet material can be continuously pulled from the roll. This film roll is usually placed on a rotatable film mandrel, so that the film roll is aligned parallel to the machine center. In the continuous packaging of articles, the film is withdrawn from the rotatably mounted film roll and fed to the machine for packaging. Such a holding and unwinding device for wound on rolls flat or sheet material is for example from DE 20 2011 001 929 U1 known.

The DE 691 09 992 T2 describes a packaging machine with a film support device. A film roll is supported by the film support in the packaging machine. For this purpose, the film roll is pushed onto a mandrel or on a film support shaft until the film roll abuts against a flange.

From the DE 698 08 690 T2 is a method of operating a sheet feeding apparatus and supplying sheets to a packaging machine. The apparatus comprises a roll supporting device having a support shaft for rotatably supporting a film roll extending in an axial direction. The A roller support device includes a roller stopper fixedly attached to the support shaft for contacting a rear end surface of the film wound around the film roller when the film roller is mounted on the support shaft.

Normally, a roll with flat or foil material wound thereon is pushed onto the foil mandrel as it is being exchanged. The stopper is previously positioned so that the film roll lies in machine means assuming optimal winding. Subsequently, the film roll is clamped on the mandrel and thus has a fixed position in the machine. The film mandrel can not recognize the winding quality of the film rolls. In addition, the film roll must be pushed by hand from the film mandrel.

A disadvantage here proves that the film roll stop can not be moved during production. However, the film web can come out of the machine center during operation if the film is e.g. very crooked or irregularly wound. The operation of inserting the film roll in the machine is very unergonomic, since the film mandrel sits below the film wrapping module and therefore the operator must bend over under the machine.

A device for film thickness detection is eg from the WO 2007/114691 A1 known. As the closest prior art, the device or the method according to the document EP 2 163 499 A1 considered.

A primary object of the invention is therefore seen to provide a film or web guide which is tolerant to unevenly or eccentrically wound wrapping material or which can compensate for misalignment of the wrapping material. In addition, should be facilitated with the invention, a change of such roles and made user-friendly.

This object of the invention is achieved with the subject matter of independent claim 1. Features of advantageous developments of the invention will become apparent from the dependent claims.

With the present invention, an adjustable stop to be supplied to the film mandrel, which is motorized. This stop is located on the service side of the machine, so that the film mandrel remains accessible for a roll change, so that a new film roll can be pushed onto the mandrel after consumption of a film roll. A second stop folds on the operating side of the film mandrel and positioned at the end of the film roll, so that the film roll of the is included in both attacks. These stops can be controlled, for example, via an optical sensor such as, for example, a light barrier, which detects the winding quality of the film, and then averages and moves the film roll on the mandrel. In addition, this stop the film roll can push completely off the mandrel, which facilitates the change of used film rolls. The foil mandrel should be able to leave the machine to allow ergonomic insertion of the film roll into the machine.

The particular advantage of the invention is that the insertion of the film roll is designed ergonomically for the operator. In addition, by automatically positioning the film roll, a poor or uneven winding of the film on the roll can be compensated, so that the film feed is optimized in a packaging machine.

To achieve the above object, the invention proposes a holding and unwinding device for wound on rolls flat and / or sheet material, which is equipped with a rotatable mandrel mounted on at least one side for largely play-free recording of a hollow or hollow cylindrical core of a roll to be unwound. The rotatable mandrel is also associated with an axial guide device for a respective roller located on the mandrel and rotatably mounted there, which is adjustable in the longitudinal direction or in the axial direction of the mandrel. This adjustability of the axial guide device is optionally decoupled from the mandrel or coupled thereto. A motor drive serves to adjust the axial guide device and / or a roller mount which carries or comprises at least the mandrel and the axial guide device. The adjustment takes place parallel to the longitudinal direction of the rotatable mandrel.

Optionally, the device comprises a suitable sensor device, in particular an optical sensor device, which can serve to detect a winding quality and / or a positional parallelism of the flat and / or film material wound on the roll. The motor drive, which serves to adjust the axial guidance device parallel to the direction of longitudinal extension of the rotatable mandrel, in this embodiment, signal and / or control technically coupled to the sensor device, so that the detected by means of the sensor device inaccuracy or lack of alignment of the unwinding web or film are detected and in dependence on the sensor signal, the adjustment of the Axialführungseinrichtung can be constantly adjusted during operation.

The above-mentioned roller holder may in particular comprise the mandrel, the axial guide device, possibly stops, a complete frame of the holder incl. The mandrel and the stops.

In particular, it may be provided that the roller or the roller holder is movable relative to a frame of a container packaging system in a direction perpendicular to the film transport direction and in particular also horizontal direction by means of a motor drive. Such a drive can for example. Adjust one or two stops in their positions between which the roller is clamped or held in the axial direction of the mandrel. Here it can be provided that the roller is moved by the drive relative to the mandrel, wherein in this variant arranged on the mandrel clamping the film or the sheet material which spans the roller in the radial direction on the mandrel, is released for the adjustment.

Alternatively or additionally, a drive may be provided, which adjusts the mandrel together with the roller thereon and in particular together with the lateral stops for the roller in the axial direction of the mandrel, wherein the mandrel and the stops are each mounted on one or more axial guides. In this variant, the clamping of the roller in the radial direction need not be solved for the adjustment.

Alternatively or additionally, a drive may be provided which can adjust a holder on which the mandrel and in particular the lateral stops for the roller are mounted, in the axial direction of the mandrel. The holder in turn is then located on an axial guide, which is connected to a machine frame. In this variant, the clamping of the roller in the radial direction need not be solved for the adjustment.

For the three described alternative variants, the drive can be used once for fine adjustment of the role during operation, in particular with a stroke that is less than 30% of the film width, and / or on the other hand for moving in and out of the role of the machine for a Foil or material web change (in particular strokes of greater than 50%, preferably over 100% of the film width) outside the operation of the machine or outside of the unwinding of the roll to be changed.

The aforementioned motor-adjustable axial guide device for the role with the flat and / or sheet material thereon can in particular by at least two stop or contact elements arranged on both sides of the roll with flat and / or sheet material are formed, between which the roll rotates. Depending on the supplied sensor values, the two stop or contact elements can be displaced parallel to the axis direction of the mandrel in one or the other direction. It can be provided in particular that the at least two stop or contact elements are adjustable together in the longitudinal direction of the rotatable mandrel. Optionally, however, even slight deviations from a precisely parallel adjustment process can be allowed if, for example, the roll width changes slightly during unwinding of the material. This may be the case when the inner region of the sheet or foil material is wound more uniformly, so that during unwinding of the material, the overall width of the roll is slightly reduced. To allow for such cases as possible no lateral play between the stop or contact elements and the rotating roller, one of the two lateral elements can be delivered slightly to the role.

The axial guide device or the at least two stop or contact elements can in particular be arranged in each case on separate carriages or else on a common carriage. These carriages or the common carriage are / is arranged to be motor-adjustable below the mandrel parallel to its direction of longitudinal extension. These guide carriages are preferably anchored on a running rail or the like, so that they can be adjusted uniformly and largely without play in the axial direction of the mandrel; The same applies to a common adjustment slide.

Furthermore, it is provided that the roller with flat and / or foil material is centered in a state fixed and / or clamped on the rotatable mandrel by the axial guide device or the at least two stop or contact elements. The rotatable mandrel, the Axialführungseinrichtung or the at least two stop or contact elements and fixed on the mandrel and / or clamped roller with flat and / or sheet material may preferably be adjustable and / or centered together in operation in the longitudinal direction of the mandrel. In this case, the mandrel guide is coupled to the axial guide means, ie, the mandrel moves in its axial direction together with the Axialführungseinrichtung. Alternatively, it can be provided that the mandrel retains its position during operation, while only the axial guide means on the carriage adjustment is parallel to the axial direction of the mandrel movable.

Furthermore, it may be advantageous if the Axialführungseinrichtung or the at least two stop or contact elements and fixed on the mandrel and / or clamped roller with flat and / or sheet material together before commissioning and / or unwinding of the on the roll located flat and / or sheet material are pre-centered together.

Furthermore, it can be provided in a variant of the device according to the invention that a free end of the mandrel associated with outer stop or contact element for pushing a new role on the mandrel or for removing a worn-out roller is pivotally mounted on the carriage. As a result, the mandrel for the removal of a used or for the assembly with a new role with it befindlichem flat or sheet material is accessible.

To facilitate pushing on a new role on the mandrel or to remove a worn-out roller, the mandrel can be moved either in the direction of its free end displaceable and / or extendable or out of its position. Thus, if the film mandrel for receiving the film roll can be driven outwards, this facilitates an ergonomic loading with another role.

In addition, for example, a welding unit for automatic and / or semi-automatic connection of a film or flat material end with a material start a newly inserted role together or offset in time with the mandrel to be movable or displaceable in the direction of its free end, which also ergonomic Feeding serves.

Furthermore, it can be provided in a variant of the device according to the invention that the sensor device, an optical sensor such as, for example, a light barrier, a camera with downstream image analysis or similar. comprises, which is signal and / or control technology coupled at least with the motor drive for the slidable in the longitudinal direction of the mandrel slide.

The present invention further comprises a container packaging system with a holding and unrolling device for wound on rolls flat and / or sheet material, a downstream in the transport direction of the flat and / or sheet material Folieneinschlagmodul for wrapping containers with the flat and / or sheet material and a arranged in the container transport direction downstream of the film wrapping module shrinking device for shrinking the film or the sheet material to the container. The holding and unwinding device, part of this Container packaging system is, may be formed in particular according to one of the previously described embodiments.

The mentioned film or sheet wound on the roll normally serves as packaging material which is processed within such a packaging machine, in particular for the packaging of packaged goods such as beverage containers or for the packaging of larger units such as complete palletizable layers Such piece goods compilations or pallets with stacked cargo or container layers. The holding and unwinding device according to the invention for flat and / or film material wound on rolls is in particular part of such a packaging machine. Since the rolls have to be changed at regular intervals during operation, but are located in a relatively inaccessible area of the packaging machine, it is important to optimize both the roll guidance and the accessibility, which is provided by means of the present invention.

A further object of the invention is to provide an improved changing method for rolls having sheets or webs wound thereon, which makes it easier to change such rolls and makes them more user-friendly.

To achieve the further object, the present invention comprises a method for changing a roll with flat and / or sheet material wound thereon within a holding and unwinding device according to one of the previously described embodiments. The role is pushed with its hollow or hollow cylindrical core on a rotatable mandrel mounted on at least one side. The mandrel is associated with an axial guide device which is adjustable in the longitudinal direction of extension of the mandrel and axially guides the roller during a unwinding process. At least one of the free end of the mandrel associated outer abutment or contact element of the Axialführungseinrichtung is arranged for the purpose of pushing a new role on the mandrel or for removing a used roll pivotally mounted on a parallel to the longitudinal axis of the mandrel motorized slide and is in the Swapped changing method for releasing the role or fixed after changing again in place. Optionally, the mandrel for pushing a new role on the mandrel or for removing a used-up role in the direction of its free end can be moved and / or extended. Moreover, it may be advantageous in a variant of the method, if a welding unit for automatic and / or semi-automatic connection of a film or flat material end with a material beginning of a newly inserted role together or offset in time with the mandrel moved outwards or towards the free end.

• Fig. 1 zeigt eine schematische Perspektivansicht einer Ausführungsvariante einer Halte- und Abrollvorrichtung für Flach- oder Folienmaterial, das auf einer Rolle aufgewickelt ist.
• Fig. 2 zeigt eine weitere Perspektivansicht der Vorrichtung gemäß Fig. 1, jedoch ohne die Rolle mit Flach- oder Folienmaterial.
• Fig. 3 zeigt eine schematische Seitenansicht der Vorrichtung gemäß Fig. 1 und Fig. 2, bei der ein Teil einer Axialführungseinrichtung zum Zwecke des Rollenwechsels verschwenkt ist.

In the following, embodiments of the invention and their advantages with reference to the accompanying figures will be explained in more detail. The proportions of the individual elements to one another in the figures do not always correspond to the actual size ratios, since some shapes are simplified and other shapes are shown enlarged in relation to other elements for better illustration.

• Fig. 1 shows a schematic perspective view of an embodiment of a holding and unwinding device for flat or sheet material, which is wound on a roll.
• Fig. 2 shows a further perspective view of the device according to Fig. 1 but without the roll with flat or foil material.
• Fig. 3 shows a schematic side view of the device according to Fig. 1 and Fig. 2 in which a part of an axial guide device is pivoted for the purpose of roll change.

For identical or equivalent elements of the invention, identical reference numerals are used. Furthermore, for the sake of clarity, only reference symbols are shown in the individual figures, which are required for the description of the respective figure. The illustrated embodiments are merely examples of how the device or method of the invention may be configured and are not an exhaustive limitation.

The schematic representations of FIGS. 1 to 3 1 shows a variant of an inventive holding and unwinding device 10 for flat or film material 14 wound on rollers 12 (FIG. Fig. 1 ). The holding and unwinding device 10 according to the invention has a rotatable mandrel 16 mounted on one side for the largely play-free reception of a hollow or hollow cylindrical core of the roll 12 with the flat or film material 14 to be unwound. The mandrel 16 has an elongate cylindrical shape and can rotate about an approximately horizontal axis. The one-sided bearing comprises a bearing block 18 and an electric drive motor 17, which can optionally also act as a brake to support the rolling of the sheet 14 optionally either easier and / or in one desired way to influence. The roll 12 with flat material 14 or film can be pushed over a free end 20 of the mandrel 16 in the axial direction and, after it has been unrolled and consumed, are pulled off again in the direction of the free end 20 of the mandrel 16.

As the FIGS. 1 to 3 can also be seen, the rotatable mandrel 16 is assigned a multi-part Axialführungseinrichtung 22 for each located on the mandrel 16 roller 12, which is adjustable in the longitudinal direction or in the axial direction of the mandrel 16. The both sides of the roller 12 arranged and this laterally leading Axialführungseinrichtung 22 is adjustable by motor, in particular electric motor, and is formed in the embodiment shown by two on both sides of the roller 12 arranged stop or contact elements 24 and 26, between which the roller 12 rotates. The two contact elements 24 and 26 are each formed by bearing plates made of sheet metal and are displaceable parallel to the longitudinal direction of the mandrel 16. For this purpose, the two contact elements 24 and 26 are respectively provided on their lower sides with slide guides 28 which engage around a flat running rail 30 on both its longitudinal sides and are displaceably guided there. The running rail 30 also serves as an anchorage for the bearing block 18, which carries the drive motor 17 and the bearing of the mandrel 16. The longitudinal extension directions of the mandrel 16 and the running rail 30 are parallel, so that the mandrel 16 is above the running rail 30, which also acts as a base and can be anchored via a plurality of screw 32 to a machine frame, not shown here.

The device 10 is further equipped with a merely indicated sensor device 34 for detecting a winding quality and / or a position parallelism of wound on the roll 12 flat and / or sheet material 14, with a motor drive for the adjustment of the axial guide means 22 along the running rail 30th signal and / or control technology is coupled. The signaling or control technology coupling is such that, for example, a detected by the sensor device 34 inaccuracy in the film or flat material winding or missing exact alignment of the unwinding web 14 or film are detected and in response to the sensor signals, the adjustment of the axial guide 22nd by motorized displacement of the two contact elements 24 and 26 on and along the slide rail 30 can be adjusted continuously during operation.

The sensor device 34 can, in particular, include an optical sensor, such as a light barrier, a camera with downstream image evaluation, or the like, which is / are signal and / or control-coupled to the motor drive for the axial guidance device 22, which in turn is adapted for positioning the roller 12 on the mandrel 16 provides.

Depending on the supplied sensor values, the two stop or contact elements 24 and 26 can be displaced parallel to the axial direction of the mandrel 16 in one or the other direction. Optionally, this slight deviations from a precisely parallel adjustment can be allowed if, for example, the roll width during unwinding of the material 14 changes slightly. This may be the case when the inner region of the sheet material 14 is wound more uniformly, so that during unwinding of the material 14, the overall width of the roll 12 is slightly reduced. In order to allow for such cases as possible no lateral clearance between the abutment or abutment elements 24, 26 and the rotating roller 12, one of the two lateral elements 24 or 26 can be delivered to the roll 12 as required slightly.

The two contact elements 24 and 26 each have mutually facing parallel contact surfaces on which the end faces of the roller 12 are guided. The mandrel 16 penetrates these contact surfaces of the system elements 24, 26 without contact; the corresponding recesses 36 for the mandrel 16 are dimensioned accordingly.

At the bearing block 18 to the drive motor 17 facing first contact element 24, a bearing plate 38 is arranged, the sliding elements such as. Balls 40, where the adjacent end face of the roller 12 can roll, so that it is largely resistant and low friction. A corresponding element is missing on the second contact element 26 or is not recognizable / illustrated there, but may also be present. If there should be no end shield in the vicinity of the free end 20 of the mandrel 16, the roller 12 can possibly slide there under light touch.

Even if this is in the FIGS. 1 to 3 is not recognizable, a corresponding end shield is typically also arranged on the pivotable second contact element 26, which is preferably constructed and designed similar to the one arranged on the first contact element 24 and in the Figures 2 and 3 clearly recognizable end plate 38. In this way it can be ensured that a developed roll 12 is guided on both sides friction and can be easily rotated.

As the schematic side view of Fig. 3 illustrated, this second abutment member 26 is designed hinged so that a new roll 12 can be pushed onto the mandrel 16 or a used roll 12 can be deducted from this. In this way, the mandrel 16 for the removal of a spent or for the assembly of a new roll 12 with it befindlichem flat or sheet material 14 is accessible. The second abutment element 26 has in each case joints 42 at its connection points to the respective lateral slide guide 28, so that in the in Fig. 3 shown manner in the free end 20 of the mandrel 16 pioneering direction can be pivoted downwards.

To facilitate pushing on a new roller 12 on the mandrel 16 or for removing a used-up roller 12, the mandrel 16 can be selectively displaced from a machine environment towards its free end 20 and / or extendable or moved out of position (not shown); this can facilitate ergonomic loading with another roller 12. In addition, for example, a (not shown here) welding unit for automatic and / or semi-automatic connection of a film or flat material end with a material start a newly inserted roll 12 together or offset in time with the mandrel 16 outward towards the free end 20 movable or displaceable, which also serves the more ergonomic loading.

The mentioned film or sheet material 14, which is wound on the roll 12, normally serves as a packaging material, which is processed within a packaging machine, not shown here, for example. For packaging of packages with piece goods such as beverage containers or for the packaging of larger units such as complete palettierfähigen layers such piece goods compilations or pallets with stacked cargo or bundle layers. The holding and unwinding device 10 according to the invention for flat and / or film material 14 wound on rollers 12 is in particular part of such a packaging machine. Since the rollers 12 have to be changed at regular intervals during operation, but are located in a relatively inaccessible area of the packaging machine, it is important to optimize both the roller guide and the accessibility, which is made possible by the device 10 described.

The invention has been described with reference to a preferred embodiment. The invention has been described with reference to a preferred embodiment. However, it is conceivable for a person skilled in the art that modifications or changes in the Invention can be made without departing from the scope of the following claims.

LIST OF REFERENCE NUMBERS

10

Holding and unrolling device, device

12

role

14

Flat and / or sheet material, material web

16

mandrel

17

drive motor

18

bearing block

20

free end

22

axial guidance

24

first investment element

26

second contact element

28

Carriage, guide carriage, slide guide

30

runner

32

screw

34

sensor device

36

recess

38

end shield

40

Ball, rolling elements

42

joint

Claims (14)

1. A holding and unwinding apparatus (10) for flat material and/or film material (14) wound onto rolls (12), with a rotatable mandrel (16) mounted at least on one side for receiving largely free of play a hollow or a hollow cylindrical core of a roll (12) to be unwound, with an axial guidance device (22) for a role (12) located on the mandrel (16) and rotatably mounted thereon, the axial guidance device (22) being adjustable in longitudinal extension direction of the mandrel (16), wherein a motor drive is provided for the adjustment of the axial guidance device and/or of a roll holder - comprising at least the mandrel (16) and the axial guidance device - parallel to the longitudinal extension direction of the rotatable mandrel (16), characterised in that

   - the axial guidance device (22) is formed by at least two stop elements or, as applicable, abutment elements (24, 26), which are disposed on both sides of the roll (12) with flat material and/or film material (14), and between which the roll (12) rotates, and in that

   - the at least two stop elements or, as applicable, abutment elements (24, 26) are in each instance disposed on carriages (28) or on a common carriage (28), which carriage/carriages (28) is/are motor-adjustable below the mandrel (16) parallel to the longitudinal extension direction thereof, and in that

   - an outer stop element or, as applicable, abutment element (26) assigned to the free end (20) of the mandrel (16) is swivellably disposed on the carriage (28) for a new roll (12) to be slid onto the mandrel (16) or, as applicable, for a used-up roll (12) to be removed.
2. The apparatus according to claim 1, with a sensor device (36) for the detection of a winding quality and/or of a parallelism of layers of the flat material and/or film material (14) wound onto the roll (12), wherein the motor drive for the adjustment of the axial guidance device parallel to the longitudinal extension direction of the rotatable mandrel (16) is signal-technically and/or regulation-technically coupled with the sensor device (36).
3. The apparatus according to claim 1 or 2, in which the roll holder comprises the mandrel (16), the axial guidance device, stops, a complete frame of the holder including the mandrel (16) and the stops.
4. The apparatus according to claim 1, in which the at least two stop elements or, as applicable, abutment elements (24, 26) are adjustable together in longitudinal extension direction of the rotatable mandrel (16).
5. The apparatus according to one of the claims 1 to 4, in which the roll (12) with flat material and/or film material (14) is centred in a fixed and/or clamped condition on the rotatable mandrel (16) by the axial guidance device (22) or, as applicable, by the at least two stop elements or, as applicable, abutment elements (24, 26).
6. The apparatus according to claim 5, in which the rotatable mandrel (16), the axial guidance device (22) or, as applicable, the at least two stop elements or, as applicable, abutment elements (24, 26), as well as the roll (12) with flat material and/or film material (14) fixed and/or clamped on the mandrel (16) are adjustable and/or centrable together in longitudinal extension direction of the mandrel (16) during operation.
7. The apparatus according to claim 5, in which the rotatable mandrel (16), the axial guidance device (22) or, as applicable, the at least two stop elements or, as applicable, abutment elements (24, 26), as well as the roll (12) with flat material and/or film material (14) fixed and/or clamped on the mandrel (16) are pre-centrable together prior to operation start-up and/or prior to an unwinding of the flat material and/or film material (14) located on the roll (12).
8. The apparatus according to claim 1, in which the mandrel (16) is shiftable and/or extendable toward its free end (20) for a new roll (12) to be slid onto the mandrel (16) or, as applicable, for a used-up roll (12) to be removed.
9. The apparatus according to claim 1 or 7, in which a welding unit for the automatic and/or partly automatic connection of an end of film material or flat material (14) to a material start of a newly inserted roll (12) is movable or shiftable outward, together with the mandrel (16) or in a temporally staggered manner, toward the free end (20) of the mandrel (16).
10. The apparatus according to one of the claims 1 to 9, in which the sensor device (36) comprises an optical sensor, which is signal-technically and/or regulation-technically coupled at least with the motor drive for the carriage/carriages (28) that is/are shiftable in longitudinal extension direction of the mandrel (16).
11. A container packaging facility with a holding and unwinding apparatus (10) for flat material and/or film material (14) wound onto rolls (12), a film wrapping module for the wrapping of containers into the flat material and/or film material (14), the film wrapping module being disposed downstream in transport direction of the flat material and/or film material (14), and a shrinking apparatus for heat shrinking the film or, as applicable, the flat material onto the containers, the shrinking apparatus being disposed downstream in container transport direction from the film wrapping module, which holding and unwinding apparatus (10) is designed according to one of the claims 1 to 10.
12. A method for changing a roll (12) with flat material and/or film material (14) wound thereonto inside a holding and unwinding apparatus (10) according to one of the claims 1 to 8, which roll (12) is slidable with its hollow or its hollow cylindrical core onto a rotatable mandrel (16) that is mounted at least on one side, wherein an axial guidance device (22) is assigned to the mandrel (16), which axial guidance device (22) is adjustable in longitudinal extension direction of the mandrel (16), and which axial guidance device (22) axially guides the roll (12) during an unwinding process, and wherein at least one outer stop element or, as applicable, abutment element (26) of the axial guidance device (22) - the stop element or, as applicable, abutment element (26) being assigned to the free end (20) of the mandrel (16) - is swivellably disposed on a carriage (28) that is motor-adjustable parallel to the longitudinal axis of the mandrel (16) for a new roll (12) to be slid onto the mandrel (16) or, as applicable, for a used-up roll (12) to be removed, and is swivelled to release the roll (12),
    characterised in that

    - the axial guidance device (22) is formed by at least two stop elements or, as applicable, abutment elements (24, 26), which are disposed on both sides of the roll (12) with flat material and/or film material (14), and between which the roll (12) rotates, and in that

    - the at least two stop elements or, as applicable, abutment elements (24, 26) are in each instance disposed on carriages (28) or on a common carriage (28), which carriage/carriages (28) is/are motor-adjusted below the mandrel (16) parallel to the longitudinal extension thereof, and in that

    - an outer stop element or, as applicable, abutment element (26) assigned to the free end (20) of the mandrel (16) is swivelled on the carriage (28) for a new roll (12) to be slid onto the mandrel (16) or, as applicable, for a used-up roll (12) to be removed.
13. The method according to claim 12, in which the mandrel (16) is shifted and/or extended toward its free end (20) for a new roll (12) to be slid onto the mandrel (16) or, as applicable, for a used-up roll (12) to be removed.
14. The method according to claim 12 or 13, in which a welding unit for the automatic and/or partly automatic connection of an end of film material or flat material (14) to a material start of a newly inserted roll (12) is moved or shifted outward, together with the mandrel (16) or in a temporally staggered manner, toward the free end (20) of the mandrel (16).

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