Clamping system for clamping label roll

Abstract

The invention relates in particular to a clamping system (24) for clamping a label roll (12) having an annular roll core. The clamping system (24) has an inner gripper (26) with a plurality of inner gripping jaws (28) distributed in a circumferential direction about a central axis (M) of the clamping system (24) and radially movable relative to the central axis (M) for internally gripping the label roll (12) on an inner circumferential surface of the annular roll core. The clamping system (24) further comprises at least one distance sensor (34) arranged to detect a distance between the clamping system (24) and the roll of labels (12).

Description

Technical Field

[0001] The invention relates to a clamping system for clamping a label roll. The invention also relates to a device for handling a label roll having such a clamping system. The invention also relates to a method for operating such a clamping system or such a device. Technical Background

[0002] In the container processing equipment, a labeling device for labeling the container can be included. For example, the labeling device can label the container with a label from a label roll (a roll with label material).

[0003] Traditionally, the label roll is added manually by the operator. If necessary, the user must perform further tasks, such as cutting the label strip to the correct position, applying double-sided tape to the label strip, or introducing the label strip into the automatic gluing.

[0004] DE 10 2021 125 133 A1 describes a mobile robot, a supply system and a method for changing label rolls at a labeling unit for labeling containers. The mobile robot accordingly comprises a vehicle device for changing the position of the robot and a manipulator device with a multi-axis manipulator and an associated end effector for manipulating the label rolls. Since the end effector is configured to support the outer circumference of the label roll and the empty roll core of the label roll, ergonomically problematic work steps when adding label rolls can be completed entirely by the machine with high precision and in a material-saving manner.

[0005] A disadvantage of the robot unit of DE 10 2021 125 133 A1 may be that, due to the small cylinder, the clamping force is relatively small and the actual maintenance of the clamping force is not disclosed. The gripper jaws are merely locked in place. With the robot unit, exact centering of the label roll is not possible, since, for example, the gripper jaws are not mechanically coupled. The diameter of the robot unit is very large, i.e. larger than the diameter of the label roll. In order to transport the label roll from the pallet to the roll holder, the clamping position must be changed from the inner gripper to the outer gripper and an intermediate depositing of the roll must be carried out, which has a negative impact on the cycle time and process reliability. Since the label roll is temporarily completely clamped on the outer circumference, the label tape can be damaged and the secure holding of the label roll is problematic. The robot unit does not prevent a possible telescoping of the label roll. Furthermore, an opened label roll cannot be handled with loose label tape.

[0006] It is an object of the present invention to provide an improved technique for handling label rolls for loading labelling devices. Preferably, at least some of the explained disadvantages of the prior art may be overcome. Summary of the invention

[0007] This object is achieved by the features of independent claim 1. Advantageous developments are given in the dependent claims and in the description.

[0008] One aspect of the present disclosure relates to a (e.g. pneumatic) clamping system for clamping a label roll having an annular core. The clamping system has a preferably pneumatic internal clamper, preferably an internal centering clamper, which has a plurality of (e.g. three) internal clamping jaws, which are distributed in a circumferential direction (e.g. uniformly) around a central axis of the clamping system and are radially movable relative to the central axis for internally clamping the label roll on the inner circumferential surface of the annular core. The clamping system also includes at least one distance sensor (e.g. an ultrasonic sensor, a reflected light scanner, a laser sensor or a capacitive sensor), which is arranged to detect the distance between the clamping system and the label roll.

[0009] Advantageously, internal clamping may be the safest and most reliable method for clamping label rolls for dynamic handling operations. By clamping on the roll core, damage to the label roll may be avoided. The detected distance may advantageously be used to determine the position of the (not yet clamped) label roll relative to the clamping system. Thus, preferably, a fine positioning of the internal clamper relative to the label roll and / or the roll core is possible, so that a particularly reliable clamping of the label roll can be enabled. By additionally knowing the thickness (height) of the label roll to be clamped, a precise positioning of the internal clamper may allow an appropriate immersion depth of the internal clamper in the roll core, with the result that both very narrow and very thick label rolls may be clamped particularly reliably inside.

[0010] The inner jaws may preferably be aligned parallel to the central axis.

[0011] In one embodiment, the at least one distance sensor has a plurality of distance sensors, which are preferably distributed in a circumferential direction (e.g. uniformly) around the central axis, preferably arranged alternately with the plurality of inner jaws. The plurality of distance sensors may advantageously allow the relative orientation of the label roll relative to the clamping system to be determined. As a result, the inner clamp for the inner clamping can be moved to an optimal alignment relative to the label roll, i.e. preferably parallel to the annular core / coaxially on the inner side of the annular core.

[0012] In another embodiment, at least one distance sensor can be aligned parallel to the central axis. Thus, distances parallel to the central axis can be advantageously detected.

[0013] In one embodiment, a plurality of internal clamping jaws are mechanically coupled to each other for a common, preferably synchronous radial movement, preferably by means of positive guide gears, particularly preferably by means of positive guide wedge hook gears. Advantageously, the common, preferably synchronous movement can allow a centered clamping of the roll core and thus of the label roll.

[0014] In another embodiment, the plurality of inner jaws each have a (e.g. curved) contact surface for abutting against the inner circumferential surface of the core, wherein the contact surface is profiled, preferably corrugated or serrated. The contour on the contact surface can advantageously allow the inner jaws to be pressed into the soft cardboard core first, thereby reliably preventing the core from slipping off.

[0015] In another embodiment variant, the plurality of inner clamping jaws are each elastically preloaded radially outwards relative to the central axis (e.g. by means of a spring). Advantageously, the elastic preload of the inner clamping jaws can allow the inner clamping jaws to clamp outwards without compressed air. Thus, preferably, in the event of a malfunction, for example in the event of a malfunction of the compressed air, a safe retention of the label roll can be ensured.

[0016] In one embodiment, the inner gripper has a preferably pneumatic pressure control valve for adjusting the gripping force (clamping force) of the inner gripper, preferably by adapting the reaction force or supporting force to the (or said) elastic prestress of the plurality of inner jaws. Adjusting the gripping force by means of the pressure control valve can advantageously support the use of the gripping system as a universal gripping system, since the gripping force can be adapted to label rolls of different sizes and therefore different weights. Thus, in particular in the case of narrow or open (partially unrolled) label rolls, the risk of deformation and damage of the roll core due to excessive gripping forces can be reduced.

[0017] In one embodiment, the inner gripper has a preferably pneumatic non-return valve for maintaining the gripping force (clamping force) of the inner gripper. In the event of a malfunction, the non-return valve can advantageously maintain the gripping force until the robot stops. Optionally, even if a slow pressure loss occurs through the non-return valve, a safe tensioning of the label roll can be further ensured by elastic pre-tensioning.

[0018] In another embodiment, the clamping system further comprises a preferably pneumatic outer clamp having a plurality of (e.g. four or six) outer jaws which are (e.g. uniformly) distributed outside the plurality of inner jaws in a circumferential direction around the central axis and which are radially movable relative to the central axis to fix the label roll on the outer circumferential surface of the label roll. Advantageously, an additional external clamping of the label roll can be made possible by means of the outer clamp. In particular narrow label rolls can tend to telescope, for example if they are only tensioned on the roll core, and are exposed to dynamic forces during fast robot movements. Therefore, in order to increase process reliability and reduce cycle times for changing rolls, the clamping system can be provided with an outer clamp, which can improve the handling of narrow label rolls in particular. Since the label roll is further tensioned on the roll core by the inner clamp and preferably only relatively small forces act on the label roll by the outer clamp, the risk of damaging the label roll can be minimized. Advantageously, the outer clamp can also allow the handling of already opened label rolls, in which the tape ends are no longer fixed (e.g. by adhesive tape), but are loose. Thus, the possibility of automatic type changeover can also be advantageously provided, since the gripper system can secure the opened label roll and remove it from the roll plate and transport it, for example, to a preparation location.

[0019] In one embodiment, the plurality of outer jaws are rounded and / or made of a material that can be elastically pressed and / or made of a softer material than the inner jaws. The rounded shape of the jaws or the soft and / or elastic material of the outer jaws can advantageously help to avoid damage to the label roll as much as possible.

[0020] In another embodiment, the maximum clamping force (clamping force) achievable by the outer gripper is less than the maximum clamping force (clamping force) achievable by the inner gripper. Advantageously, this allows the label roll to be actually fixed only on the outside, while the actual clamping is performed by the inner gripper.

[0021] In a variant embodiment, the plurality of outer jaws are mechanically coupled to the plurality of inner jaws for radial movement with the plurality of inner jaws relative to the central axis, and the outer jaws are additionally movable radially relative to the central axis independently of the plurality of inner jaws. Alternatively or additionally, the outer clamp is fastened to the outside of the plurality of inner jaws. Alternatively or additionally, the plurality of outer jaws are movable parallel to the central axis, preferably retractable and extendable. Advantageously, by means of the mechanical coupling, particularly preferably by fastening the outer clamp directly to the inner jaws, a direct force flow during the clamping process can be ensured. Thus, the outer clamp can advantageously be designed to be particularly rigid and lightweight.

[0022] In another embodiment variant, the plurality of external jaws has a plurality of (e.g. two or three) first external jaws and a plurality of (e.g. two or three) second external jaws. The plurality of first external jaws are arranged outside the plurality of internal jaws so as to be distributed (e.g. uniformly) in a circumferential direction around the central axis. The plurality of second external jaws are arranged outside the plurality of first external jaws, and the plurality of second external jaws are distributed (e.g. uniformly) in a circumferential direction around the central axis. The configuration with first (inner) external jaws and second (outer) external jaws can advantageously allow a very large clamping range for clamping label rolls of very different diameters, while having a compact and simple structure. Thus, preferably, all conventional label roll diameters up to 600 mm can be fixed externally by the external clamp.

[0023] In one embodiment, the external clamp has a plurality of radial lifting cylinders, which are connected to the external clamping jaws for radially moving the plurality of external clamping jaws relative to the central axis. Preferably, each of the plurality of radial lifting cylinders can be fastened externally to each of the plurality of internal clamping jaws. By connecting the radial lifting cylinders to the outside of the internal clamping jaws, preferably directly, a direct force flow during clamping can advantageously be ensured. As mentioned above, the external clamp can thus advantageously be designed to be particularly rigid and lightweight.

[0024] In a further embodiment, a plurality of radial lifting cylinders each have a displacement measuring sensor. When the label roll is clamped externally, the outer diameter of the label roll can advantageously be checked with the aid of the distance measuring sensor. When the outer diameter of the label roll is known, the correct positioning of the outer clamping jaws can also be checked. Furthermore, telescoping of a particularly poorly wound label roll can advantageously be determined if the outer diameter of the roll changes downwards due to slippage / unwinding of the label tape. Then, for example, a warning can be issued and, for example, an operator intervention can be triggered.

[0025] In one embodiment, each of the plurality of radial lifting cylinders is connected to two outer jaws for radially moving the two outer jaws (e.g., one of the first outer jaws and one of the second outer jaws). Therefore, the structure of the outer clamp can be advantageously simplified, and the outer clamp can be constructed more compactly.

[0026] In another embodiment, the outer gripper has a plurality of axial lifting cylinders connected to the outer jaws for axially moving the plurality of outer jaws parallel to the central axis, wherein preferably each of the plurality of axial lifting cylinders is connected to each of the outer jaws for axially moving the outer jaws. The axial retraction and extension may advantageously allow the outer jaws to be retracted when not needed, for example if it would interfere with the inner gripping, or if it would interfere with the positioning of the gripping system. The axial retraction and extension may also advantageously allow, for example, only certain outer jaws, for example only the first outer jaw or only the second outer jaw, to engage with the outer circumferential surface of the label roll.

[0027] In a variant embodiment, the plurality of radial lifting cylinders are connected together with the outer clamping jaws to the plurality of axial lifting cylinders for radially moving the plurality of axial lifting cylinders relative to the central axis. Preferably, each of the plurality of radial lifting cylinders can be connected to two of the plurality of axial lifting cylinders for radially moving the two axial lifting cylinders. Alternatively or additionally, the plurality of axial lifting cylinders are connected between the plurality of radial lifting cylinders on the one hand and the outer clamping jaws on the other hand.

[0028] Another aspect of the present disclosure relates to a device for handling a label roll having an annular core. The device has a clamping system as disclosed herein. The device further comprises a preferably fixed robot, preferably a multi-axis robot, particularly preferably a bent-arm robot, wherein the robot carries the clamping system as an end effector. The device further comprises a handling device, which is configured to operate the robot according to a distance between the label roll and the clamping system detected by at least one distance sensor, for (e.g., precisely) positioning the clamping system for clamping the label roll with the help of an internal clamp. Optionally, the handling device is also configured to operate the robot for (e.g., precisely) positioning the clamping system for clamping the label roll with the help of the internal clamp further according to a detection or a predetermined thickness of the label roll, preferably for adjusting the immersion depth of the internal clamp in the core according to the thickness. Advantageously, the device can allow the same advantages already explained with reference to the clamping system to be achieved.

[0029] In one embodiment, the at least one distance sensor comprises a plurality of distance sensors. The processing device is further configured to

[0030] - determining the orientation of the label roll relative to the gripping system based on the distances detected by the plurality of distance sensors, and

[0031] - an operating robot for aligning a gripper system for gripping the label roll by means of the inner gripper according to the determined alignment, preferably for aligning a plurality of inner grippers parallel to the roll core for gripping the label roll.

[0032] As already mentioned, even in the case of very narrow label rolls, the label roll can thus advantageously be clamped in a particularly material-saving and safe manner, thereby achieving a large dynamic when handling the clamped label roll.

[0033] In another embodiment, the gripping system or robot comprises a camera for photographing the label roll, preferably a 2D or 3D camera, and the processing device is further configured to:

[0034] - determining the position of the label roll based on the camera's image, and operating the robot to position the gripping system (e.g. in advance) based on the determined position to grip the label roll with the help of the internal gripper; and / or

[0035] - determining the positions of a plurality of label rolls within the roll stack based on the camera images and operating the robot to (eg pre-)position the gripping system to grip the respective uppermost label roll of the roll stack with the aid of the internal grippers based on the determined positions.

[0036] Advantageously, the camera can allow a pre-positioning of the clamping system, making possible a subsequent fine positioning by means of the at least one distance sensor. Advantageously, the camera can also be used to rotate the clamping system about its central axis, so that the outer clamping jaw is positioned in such a way that it can dip into the gap between the label rolls of one or more roll stacks. Thus, the outer clamping can advantageously take place at the earliest possible time.

[0037] In one embodiment, the clamping system further comprises an external clamp, which is preferably pneumatic, and the external clamp has a plurality of external jaws, which are preferably distributed outside the plurality of internal jaws in a circumferential direction around the central axis (e.g. uniformly), and can be radially moved relative to the central axis to fix the label roll on the outer peripheral surface of the label roll. The external clamp can have a plurality of radial lifting cylinders, which are connected to the external jaws and are used to radially move the plurality of external jaws relative to the central axis. The plurality of radial lifting cylinders each have a displacement measurement sensor. The processing device is also configured to

[0038] - determining the diameter of the label roll fixed externally by means of external clamping jaws based on the signal output of the distance measuring sensor; and optionally,

[0039] - comparing the determined diameter with a set diameter of the label roll to identify the correct positioning of the plurality of external jaws; and / or

[0040] - Determine the diameter several times in succession on the same label roll in order to detect expansion and contraction of the label roll if the diameter decreases.

[0041] Another aspect of the present disclosure relates to an apparatus for labeling containers. The apparatus has a (e.g. rotary) labeling apparatus having a labeling unit for labeling containers. The apparatus also includes an apparatus for handling label rolls as disclosed herein. The robot is configured to automatically load the label rolls onto a roll holder connected to the labeling unit by means of a gripping system for unwinding the respective label rolls onto a labeling belt for supplying to at least one labeling unit for labeling containers.

[0042] Preferably, the clamping shaft and the plurality of inner clamping jaws of the roll holder may be shaped and / or arranged complementary to each other, preferably allowing the plurality of inner clamping jaws to dip into gaps between the clamping elements of the clamping shaft during transfer of the label roll.

[0043] Another aspect of the present disclosure relates to a container processing device (e.g., for tempering, manufacturing, cleaning, coating, testing, filling, closing, pasteurizing, labeling, printing, lettering, laser lettering and / or packaging of containers for liquid or pasty media, preferably beverages, liquid foods or products from the pharmaceutical or healthcare industries). The container processing device may include the gripping system disclosed herein or the device disclosed herein.

[0044] For example, the container can be a bottle, jar, can, carton, vial, tube, etc.

[0045] The term "processing device" can preferably refer to an electronic device (for example designed as a drive circuit or having a microprocessor and a data memory) and / or a mechanical, pneumatic and / or hydraulic controller, which can take over control tasks and / or regulation tasks and / or processing tasks depending on the design. Although the term "control" is used here, it can also appropriately include or mean "regulation" or "feedback control" and / or "processing".

[0046] Another aspect of the present disclosure relates to a method for operating a clamping system as disclosed herein or a device as disclosed herein, wherein the method comprises at least one of the following:

[0047] - detecting at least one distance between the clamping system and the label roll by means of at least one distance sensor;

[0048] - (e.g. finely) positioning and / or aligning the inner gripper to the annular core of the label roll according to the detected at least one distance, preferably with the aid of a robot;

[0049] - after positioning and / or alignment, the label roll is internally clamped on the inner circumferential surface of the roll core by a plurality of inner jaws of the inner clamp, preferably by elastic prestressing of the plurality of inner jaws; and optionally:

[0050] - fixing the internally clamped label roll to the outer peripheral surface of the label roll by means of a plurality of outer clamping jaws of an outer clamp of the clamping system; and / or

[0051] - regulating the holding force (clamping force) of the inner holder by means of a preferably pneumatic pressure control valve; and / or

[0052] During the transfer of the label roll between the inner gripper and the clamping shaft, the inner gripper is aligned with the clamping shaft of a roll holder (eg connected to a labelling unit), preferably such that the inner jaws can be immersed in the gaps between the clamping elements of the clamping shaft.

[0053] Advantageously, the method may allow achieving the same advantages already explained with reference to the clamping system.

[0054] The preferred embodiments and features of the present invention described above may be combined with each other as needed. BRIEF DESCRIPTION OF THE DRAWINGS

[0055] Other details and advantages of the present invention will be described below with reference to the accompanying drawings. In the accompanying drawings:

[0056] Figure 1 shows a perspective view of a device according to an embodiment of the present disclosure;

[0057] Figure 2 A perspective view showing a clamping system according to an embodiment of the present disclosure; and

[0058] Figure 3 A side view of an exemplary clamping system is shown.

[0059] The embodiments shown in the figures correspond at least in part, so similar or identical parts are given the same reference numerals, and in order to avoid repetition, reference is also made to the description of other embodiments or figures for explanation. DETAILED DESCRIPTION

[0060] Figure 1 The robot 20, the processing device 22 (only in Figure 1 ) and a device 10 with a clamping system 24 (schematically shown in FIG. 1 ). Figure 2 and Figure 3 The gripping system 24 is shown in more detail. The device 10 may preferably be incorporated into a container handling plant.

[0061] The device 10 is configured to process a label roll 12. The device 10 can capture a label roll 12 from a roll stand 14, move it to a roll holder 16, and deliver it to the roll holder 16. The device 10 can also capture a label roll 12 from a roll holder 16, move it to the roll stand 14, and deposit it on the roll stand 14.

[0062] The roll stand 14 may be a tray, such as Figure 1 Optionally, the roll stand 14 may be a workbench, for example, on which the label roll 12 may be stored.

[0063] For example, a user can manually, for example by means of a pallet truck or a forklift, refill the roll rack 14 with label rolls 12. Alternatively or additionally, the label rolls can be automatically refilled on the roll rack 14, for example by means of an automated guided vehicle (AGV).

[0064] The roll holder 16 may be, for example, a reel for holding and unwinding the label roll 12. Figure 1 As shown, the roll holder 16 may be aligned horizontally. Alternatively, the roll holder 16 may be aligned vertically, for example.

[0065] The roll holder 16 may preferably have a clamping shaft 18. By means of the clamping shaft 18, the label roll 12 can be clamped securely on the roll holder 16.

[0066] The clamping shaft 18 can preferably have a plurality of clamping elements for clamping the label roll 12. The clamping elements can be moved radially, for example retracted and extended, for example relative to the central longitudinal axis of the clamping shaft 18. The clamping elements are preferably distributed (for example uniformly) around the circumference of the clamping shaft 18. The clamping elements can be spaced apart from each other. The clamping elements are preferably arranged equidistantly from each other and / or from the central longitudinal axis of the clamping shaft 18. The clamping elements can be designed, for example, as clamping claws or clamping strips.

[0067] The roll holder 16 can be connected to the labeling unit of the labeling device for supplying the label tape rolled up from the label roll (not shown in the figure) to the labeling unit. The labeling unit can be configured to apply the label from the label tape to the container. The labeling unit can be interchangeably connected and separated, for example, by a quick coupling mechanism preferably without tools, at the periphery of the labeling device. The labeling device can be rotated by a drive. The labeling device can preferably be designed as a rotary labeling device with a turntable that can be rotated by means of a drive. The containers can be kept at a distance from each other on the circumference of the turntable in the processing station and labeled by the labeling unit. Optionally, the labeling device can be designed as, for example, a linear labeling device, for example, with only one processing station or with a plurality of processing stations arranged side by side and / or one after another.

[0068] However, the roll holder 16 may also be, for example, just a tray or a table or a conveyor.

[0069] The robot 20 may carry a gripping system 24 as an end effector. The robot 52 may automatically load the label roll 12 from the roll stand 14 onto the roll holder 16 with the aid of the gripping system 24.

[0070] The robot 20 is preferably a multi-axis robot, particularly preferably a bending arm robot. For example, the bending arm robot can be a 5-axis, 6-axis or 7-axis bending arm robot. Other types of robots are also conceivable. The robot 20 is preferably a fixed robot. However, the robot 20 can also be a mobile robot. The robot 20 can be an industrial robot with or without collaborative functions.

[0071] The processing device 22 may be configured to operate the robot 20 and / or the gripping system 24. For example, the processing device 22 may operate the robot 20 to move, position, and / or align the gripping system 24. For example, the processing device 22 may operate the gripping system 24 to grip (e.g., internally and / or externally grip) the label roll 12 and release the gripped label roll 12.

[0072] The clamping system 24 is preferably a pneumatic clamping system. The clamping system 24 is configured to clamp a label roll 12 having an annular roll core. The clamping system 24 has a central axis M.

[0073] Preferably, the clamping system 24 is sized and designed so that it can clamp label rolls 12 having a diameter in the range between approximately 160 mm and 600 mm.

[0074] The gripping system 24 has an internal gripper 26, which is preferably pneumatic, and a plurality of distance sensors 34. Optionally, the gripping system 24 may also include an external gripper 38, which is preferably pneumatic, for example.

[0075] Preferably, the inner clamp 26 may be an inner centering clamp. The inner centering clamp may be self-centering. The inner centering clamp may close in the center and clamp the annular roll core of the label roll 12 in the center.

[0076] Preferably, the internal clamp 26 can clamp the label roll 12 on the roll core by tensioning / clamping the label roll 12 from the inside.

[0077] The inner gripper 26 has a plurality of inner jaws 28. Preferably, exactly two or three inner jaws 28 are included.

[0078] The inner jaw 28 may be in the form of a cylindrical jacket segment, for example. The inner jaw 28 may extend elongately, preferably parallel to the central axis M, for example.

[0079] The inner jaws 28 are distributed in the circumferential direction around the central axis M. The inner jaws 28 may be spaced apart from one another. The inner jaws 28 are preferably arranged equidistantly relative to one another and / or relative to the central axis M. For example, the inner jaws 28 may be arranged relative to the central axis M at an angle of 360° / number of inner jaws.

[0080] Preferably, the arrangement of the inner clamping jaws 28 can be substantially complementary to the arrangement of the clamping elements of the clamping shaft 18 (see Figure 1 During the transfer of the label roll 12 to or from the clamping shaft 18 , the inner clamping jaws 28 can preferably be oriented such that they each dip into a gap between two clamping elements of the clamping shaft 18 .

[0081] The inner jaws 28 may each have a contact surface for abutting against the inner circumferential surface of the roll core of the label roll 12. The contact surface may be oriented radially outwardly relative to the central axis M. The contact surface may preferably be arcuate. Preferably, the contact surface is profiled, for example corrugated or serrated.

[0082] The inner jaw 28 may be, for example, a metal milled component or a metal forged component.

[0083] The inner jaws 28 are radially movable relative to the central axis M for internally clamping the label roll 12 on the inner circumferential surface of the annular core. The radial movement can preferably be achieved by applying elastic prestress and / or pneumatic pressure to the inner clamp 26.

[0084] For example, the inner gripper 26 may have a pneumatic cylinder-piston unit which is mechanically coupled via gears to the inner jaw 28. Preferably, an elastic element for pre-tensioning the piston on the cylinder may be arranged in the cylinder.

[0085] Alternatively, any other suitable drive for driving the radial movement of the inner jaw 28 is possible.

[0086] The inner jaws 28 can preferably be mechanically coupled to each other. For example, the inner jaws 28 can be moved together radially relative to the center axis M, preferably synchronously, by means of a mechanical coupler. The mechanical coupler can be designed, for example, as a positive guide gear, preferably a positive guide wedge hook gear.

[0087] Preferably, the inner jaws 28 are elastically preloaded radially outwards in each case relative to the center axis M. For example, the inner clamp 26 can have an elastic element. The elastic element can preload the inner jaws 28 radially outwards relative to the center axis M, preferably by elastically preloading a piston onto the cylinder of the inner clamp 26. For example, the elastic element can be arranged in the cylinder of the inner clamp 26. The elastic element can be, for example, a spring, preferably a helical spring. The helical spring is preferably arranged coaxially with the center axis M. Preferably, in a pressure-free state (no compressed air acts on the cylinder of the inner clamp), the inner jaws 28 can be preloaded radially outwards.

[0088] The inner clamp 26 may also have a check valve 30, preferably pneumatic, for maintaining the clamping force of the inner clamp 26 (see Figure 2 ).

[0089] The internal clamp 26 preferably has a function for adjusting the clamping force or the clamping force. For example, the internal clamp 26 may have a pressure control valve 32. The pressure control valve 32 may be a pneumatic pressure control valve (see Figure 2 ).

[0090] The pressure control valve 32 can preferably adapt the clamping force by adapting the reaction force to the elastic prestressing of the inner clamping jaw 28 caused by the elastic element. For example, the clamping force can be reduced in the case of narrow label rolls 12. The elastic element for prestressing the inner clamping jaw 28 can be adapted accordingly to the heaviest label rolls 12.

[0091] Alternatively, the pressure control valve 32 can adapt the clamping force, for example by adapting the supporting force to the elastic prestressing of the inner jaws 28 caused by the elastic element. In this case, the elastic element for prestressing the inner jaws 28 can be designed to be weaker than in the previous case. For example, the heaviest label rolls 12 can be held only under low dynamic forces or remain stationary. In production operation, the clamping force can be increased accordingly by applying compressed air to the cylinders of the inner gripper 26. This compressed air action can optionally be adapted to the corresponding label roll type via the pressure control valve 32.

[0092] The gripping force / clamping force of the inner gripper 26 can preferably be adapted to the material of the core of the label roll 12 via the pressure control valve 32. For example, the handling device 22 can adjust the operation (position) of the pressure control valve 32 according to the intended material of the core. For example, a plastic core may require a greater gripping force than a cardboard core.

[0093] The pressure control valve 32 can be adjusted manually or automatically (adjustable). For example, the processing device 22 can be configured to adjust the pressure control valve 32 according to the desired clamping force of the internal clamp 26 and / or according to the predetermined weight of the label roll 12 and / or according to the material of the roll core of the label roll 12.

[0094] At least one distance sensor 34 is arranged to detect the distance between the clamping system 24 and the label roll 12. Preferably, the at least one distance sensor 34 may be aligned parallel to the central axis M.

[0095] Specifically, each distance sensor 34 may preferably detect the distance between the side (top side) of the label roll 12 facing the clamping system 24 and the corresponding distance sensor 34 .

[0096] Preferably, at least one distance sensor 34 can detect the distance to the rolled-up label strip of the label roll 12 and the distance to the roll core of the label roll 12. Since the label strip can protrude over the roll core, damage to the label strip can be prevented when the different detection distances are taken into account when positioning the gripper system 24 by the handling device 22. On the other hand, if, for example, only the distance to the roll core is detected and taken into account, there is a risk that the inner gripper jaws move too far in the label roll 12.

[0097] The at least one distance sensor 34 may be configured as, for example, an ultrasonic sensor, a reflected light scanner, a laser sensor, or a capacitive sensor.

[0098] Preferably, a plurality of distance sensors 34 are included, for example exactly two or three distance sensors 34. The distance sensors 34 may preferably be arranged distributed in a circumferential direction around the central axis M. Preferably, the distance sensors 34 and the inner jaws 28 may alternate in a circumferential direction around the central axis M.

[0099] For example, the distance sensors 34 may be arranged equidistantly relative to the central axis M and / or relative to each other. For example, the distance sensors 34 may be arranged relative to the central axis M at an angle of 360° / number of distance sensors to each other.

[0100] Preferably, the processing device 22 can operate the robot 20 for positioning the gripping system 24 to grip the label roll 12 with the help of the internal gripper 26 according to the detected one or more distances. Therefore, the internal gripper 26 can preferably be positioned at a relatively precise distance from the label roll 12.

[0101] Optionally, the positioning of the gripper system 24 can also depend on the thickness (height) of the label roll 12. The immersion depth of the inner gripper 26 in the roll core can preferably be adjusted according to the thickness of the label roll 12. The thickness can be predetermined, for example, by known, detected or predetermined type parameters of the label roll 12. Alternatively, the thickness can be detected, for example, by a camera 36 (see Figure 3 ).

[0102] Preferably, by taking the thickness into account, the clamping length along the center axis M can be optimized or maximized without the risk of the inner clamping jaws 28 protruding beyond the roll core. For example, very narrow label rolls 12 can also be shot out of the stack without damaging or moving the corresponding label roll 12 located below it. In the case of wide or thick and therefore heavy label rolls 12, the inner clamping jaws 28 can be moved further into the roll core, thereby ensuring a reliable clamping of the label roll 12.

[0103] The gripping system 24 may also preferably have an alignment function. For example, the handling device 22 may also be configured to determine the orientation of the label roll 12 relative to the gripping system 24 based on the distances detected by the plurality of distance sensors 34. The robot 20 may then also operate based on the determined alignment to align the gripping system 24 for gripping the label roll 12 by means of the inner gripper 26. Thus, preferably, the inner gripper 28 may be aligned parallel to the roll core of the label roll 12, so that the label roll 12 may be gripped particularly reliably and centered.

[0104] For example, the distance between the gripper system 24 and the label roll 12 can be detected at several positions (e.g. three positions). The detection can preferably be performed by a plurality of (e.g. three) distance sensors 34 arranged uniformly on the circumference. Alternatively, the measurement can be performed by only one distance sensor 34, which can be moved by the robot 20 to several (e.g. three) different measuring positions.

[0105] The processing device 22 may be configured to calculate the tilt of the gripper system 24 relative to the label roll 12 from the distances detected at the plurality of positions. The processing device 22 may be configured to compensate (level) the robot 20 for this tilt by adjusting the gripper system 24's posture.

[0106] The optical camera 36 may be part of the clamping system 24, such as Figure 3 As shown in the example in. Optionally, the camera 36 can be carried directly by the robot 20, for example. The camera 36 can be, for example, a 2D or 3D camera.

[0107] The camera 36 is configured to photograph the label roll 12. Based on the photographing of the camera 36, ​​the processing device 22 can, for example, determine the position of the label roll 12 on the roll stand 14 and operate the robot to position the clamping system 24 for clamping the label roll 12. It is also possible to determine the positions of multiple label rolls 12 in the roll stack from the photographing of the camera 36 and position the clamping system 24 taking into account the determined positions.

[0108] For example, based on the filming of the camera 36, ​​a preliminary positioning of the gripper system 24 relative to the label roll 12 can be performed. For precise positioning, for example, the distance detected by the distance sensor 34 can be taken into account.

[0109] The distance and / or the direction between the gripper system 24 and the label roll 12 can also be determined from the (eg 3D) recording of the camera 36 .

[0110] The device 10 can also be automatically aligned relative to the roll holder 16 and / or the clamping shaft 18 by means of the distance sensor 34 and / or the camera 36 .

[0111] The outer clamp 38 can fix the label roll 12 that has been clamped internally on the outer peripheral surface of the label roll 12. Preferably, the maximum clamping force that can be applied by the outer clamp 38 can be smaller than the maximum clamping force that can be applied by the inner clamp 26.

[0112] The outer gripper 38 may have a plurality of outer jaws 40 , 42 , a plurality of radial lift cylinders 44 , and / or a plurality of axial lift cylinders 46 , 48 .

[0113] The outer clamping jaws 40 , 42 are used to fix the label roll from the outside. In order to fix the label roll 12 on the outer peripheral surface of the label roll 12 , the outer clamping jaws 40 , 42 can be radially moved relative to the central axis M.

[0114] The outer jaws 40, 42 can preferably be designed for material-friendly external clamping of the label roll 12. For example, the outer jaws 40, 42 can be round. The outer jaws 40, 42 can be made of a material that can be elastically pressed in. The outer jaws 40, 42 can be made of a softer material than the inner jaws 28.

[0115] The outer jaws 40, 42 may be, for example, T-shaped or rod-shaped. Preferably, the outer jaws 40, 42 may be radially aligned toward the central axis M.

[0116] The outer jaws 40, 42 may be arranged outside the inner jaw 28 so as to be distributed in the circumferential direction around the central axis M. Preferably, a plurality of first (inner) outer jaws 40 and a plurality of second (outer) outer jaws 42 are included.

[0117] The first outer jaws 40 may be arranged outside the inner jaws 28 so as to be distributed around the central axis M in the circumferential direction, preferably equidistant from each other and / or equidistant from the central axis M. For example, the first outer jaws 40 may be arranged from each other at an angle of 360° / number of first outer jaws relative to the central axis M.

[0118] The second outer jaws 42 may be arranged outside the first outer jaws 40 so as to be distributed around the central axis M in the circumferential direction, preferably equidistant from each other and / or equidistant from the central axis M. For example, the second outer jaws 42 may be arranged from each other at an angle of 360° / number of second outer jaws relative to the central axis M.

[0119] The first and second outer jaws 40, 42 together with their lifting cylinders 44 and optionally 46, 48 can allow a very large clamping range. The first outer jaw 40 can externally fix a label roll 12 having a smaller diameter than the label roll 12, which can externally fix the second outer jaw 42.

[0120] For example, the first outer jaw 40 can fix a label roll 12 having a diameter between about 160 mm and 380 mm on the outside. For example, the second outer jaw 42 can fix a label roll 12 having a diameter between about 380 and 600 mm on the outside.

[0121] The radial lifting cylinders 44 are used to apply a clamping force to the outer peripheral surface of the label roll 12 via the outer clamping jaws 40 , 42 .

[0122] Specifically, the radial lifting cylinders 44 may be connected to the outer jaws 40, 42 and radially move them relative to the central axis M. Preferably, one of the radial lifting cylinders 44 may be respectively connected to one of the first outer jaw 40 and the second outer jaw 42 for radial movement of the two outer jaws 40, 42.

[0123] The outer clamp 38 can be fixed to the outside of the plurality of inner jaws 28, preferably by screws. For example, one of the radial lifting cylinders 44 can be fastened to the outside of the corresponding one of the inner jaws 28, preferably by screws, for example at the end face. Thus, the outer jaws 40, 42 can be mechanically coupled to the inner jaws 28 so as to move radially with the inner jaws 28 relative to the center axis M. By retracting and extending the radial lifting cylinders 44, the outer jaws 40, 42 can also be moved radially relative to the center axis M independently of the plurality of inner jaws 28.

[0124] Preferably, the outer jaws 40, 42 can also be moved parallel to the center axis M, preferably retractable and extendable. Specifically, axial lifting cylinders 46, 48 can be connected to the outer jaws 40, 42 and can move the outer jaws 40, 42 parallel to the center axis M. Each of the axial lifting cylinders 46, 48 is preferably connected to each of the corresponding outer jaws 40, 42 for parallel movement of these outer jaws 40, 42 relative to the center axis M.

[0125] Preferably, a plurality of first (inner) axial lift cylinders 46 and a plurality of second (outer) axial lift cylinders 48 are included.

[0126] The first axial lift cylinder 46 may be arranged radially inside the second axial lift cylinder 48 relative to the center axis M. The first axial lift cylinders 46 may be distributed in a circumferential direction around the center axis M, preferably equidistant from each other and / or equidistant from the center axis M. The second axial lift cylinders 28 may be distributed in a circumferential direction around the center axis M, preferably equidistant from each other and / or equidistant from the center axis M.

[0127] A first axial lift cylinder 46 may be connected to the first outer jaw 40 for axially moving the first outer jaw 40 parallel to the center axis M. A second axial lift cylinder 48 may be connected to the second outer jaw 42 for axially moving the second outer jaw 42 parallel to the center axis M.

[0128] While the axial lifting cylinders 46 , 48 can be retracted and extended, the outer clamping jaws 40 , 42 can preferably be guided in each case on at least one guide column.

[0129] The axial lifting cylinders 46, 48 may be connected between the plurality of radial lifting cylinders 44 and the outer jaws 40, 42. Preferably, the plurality of radial lifting cylinders 44 may be connected to the axial lifting cylinders 46, 48 together with the outer jaws 40, 42 for radial movement of the axial lifting cylinders 46, 48 relative to the center axis M.

[0130] For example, one of the radial lift cylinders 44 may be connected to two axial lift cylinders 46, 48 (e.g., one of the first axial lift cylinders 46 and one of the second axial lift cylinders 48), respectively, for radial movement of the two axial lift cylinders 46, 48. In each case, the two axial lift cylinders 46, 48 may preferably be located on the radial lift cylinder 44.

[0131] The method for processing the label roll 12 may include, for example, the following steps.

[0132] In order to receive the label roll 12, the label roll 12 can first be clamped on the inner circumferential surface of the roll core by the inner jaws 28 of the inner gripper 26. Then, the internally clamped label roll 12 can be fixed on the outer circumferential surface of the label roll 12 by a plurality of outer jaws 40 or 42. For external fixing, the outer jaws 40 or 42 can first be extended by means of axial lifting cylinders 46 or 48. Then, the outer jaws 40 or 42 can be moved radially inwardly relative to the center axis M by means of radial lifting cylinders 44 until the desired external clamping is achieved on the outer circumferential surface of the label roll 12.

[0133] Preferably, the outer gripper 38 may be designed such that in the retracted state of the axial lifting cylinders 46, 48, the interference profile created by the outer jaws 40, 42 is smaller than the outer diameter of the label roll of 550-600 mm.

[0134] Preferably, each radial lifting cylinder 44 can have a preferably analog distance measuring sensor. The processing device 22 can determine the diameter of the label roll 12 fixed externally, for example, by the external clamping jaws 40 or 42, from the signal output of the distance measuring sensor.

[0135] Preferably, the determined diameter may be compared to a set diameter of the label roll 12 to identify the correct positioning of the plurality of outer jaws 40 , 42 .

[0136] It is also possible to determine the diameter several times in succession on the same label roll 12 in order to detect (unwanted) expansion and contraction of the label roll 12 in the event of a reduction in diameter.

[0137] The invention is not limited to the preferred embodiments described above. On the contrary, a large number of variants and variations are possible, which also utilize the concept of the invention and therefore fall within the scope of protection. In particular, the invention also claims the subject matter and features of the dependent claims independent of the cited claims. In particular, the individual features of independent claim 1 are disclosed independently of each other. Furthermore, features of the dependent claims are disclosed independent of all features of independent claim 1, and for example features regarding the presence and / or configuration of an internal clamp, an internal clamping jaw and / or at least one distance sensor independent of independent claim 1. All range descriptions provided herein are to be understood as disclosed, i.e. all values ​​falling within the respective ranges appear to be disclosed individually, for example, preferably also as narrower outer boundaries of the respective ranges.

[0138] Reference numerals list

[0139] 10 Device for handling label rolls

[0140] 12 Label Roll

[0141] 14 Roll Stand

[0142] 16 roll holder

[0143] 18 Clamping shaft

[0144] 20 Robot

[0145] 22 Processing device

[0146] 24 Clamping system

[0147] 26 Internal gripper

[0148] 28 Internal jaws

[0149] 30 Check valve

[0150] 32 Pressure control valve

[0151] 34 Distance Sensor

[0152] 36 Cameras

[0153] 38 External holder

[0154] 40 external jaws

[0155] 42 external gripper

[0156] 44 Radial lift cylinder

[0157] 46 Axial lift cylinder

[0158] 48 Axial lift cylinder

[0159] M Center axis

Claims

1. A clamping system (24) for clamping a label roll (12) having an annular roll core, wherein: The clamping system (24) comprises: a preferably pneumatic internal gripper (26), preferably an internal centering gripper, wherein the internal gripper (26) has a plurality of internal gripping jaws (28) which are distributed in a circumferential direction around a center axis (M) of the gripping system (24) and are radially movable relative to the center axis (M) for internally gripping the label roll (12) on the inner circumferential surface of the annular core; and At least one distance sensor (34) is arranged to detect the distance between the clamping system (24) and the label roll (12).

2. The clamping system (24) according to claim 1, wherein: The at least one distance sensor (34) comprises a plurality of distance sensors (34), the plurality of distance sensors (34) being distributed in a circumferential direction around the central axis (M), preferably arranged alternately with the plurality of inner jaws (28); and / or The at least one distance sensor (34) is aligned parallel to the central axis (M).

3. The clamping system (24) according to claim 1 or claim 2, wherein: The plurality of inner jaws (28) are mechanically coupled to one another for a common, preferably synchronous radial movement, preferably by means of positive guide gears, particularly preferably by means of positive guide wedge hook gears; and / or The plurality of inner jaws (28) each have a contact surface for abutting against the inner circumferential surface of the winding core, wherein the contact surface is profiled, preferably corrugated or serrated.

4. The clamping system (24) according to any one of the preceding claims, wherein: The plurality of inner jaws (28) are each elastically preloaded radially outward relative to the central axis (M); and / or The internal gripper (26) has a preferably pneumatic pressure control valve (32) for adjusting the gripping force of the internal gripper (26), preferably by adapting the reaction force or supporting force to the elastic prestress of the plurality of internal jaws (28); and / or The inner clamp (26) has a preferably pneumatic check valve (30) for maintaining the clamping force of the inner clamp (26).

5. The clamping system (24) according to any one of the preceding claims, wherein: The clamping system (24) further comprises an external clamp (38) which is preferably pneumatic, and has a plurality of external clamping jaws (40, 42), which are distributed outside the plurality of internal clamping jaws (28) in a circumferential direction around the central axis (M) and can be radially moved relative to the central axis (M) to fix the label roll (12) on the outer peripheral surface of the label roll (12), wherein, preferably, - the plurality of outer jaws (40, 42) are round and / or made of a resiliently compressible material and / or made of a softer material than the inner jaws (28); and / or - the maximum clamping force achievable by the outer clamp (38) is less than the maximum clamping force achievable by the inner clamp (26).

6. The clamping system (24) according to claim 5, wherein: The plurality of outer jaws (40, 42) are mechanically coupled to the plurality of inner jaws (28) for radial movement with respect to the central axis (M) and the plurality of inner jaws (28), and the outer jaws (40, 42) are further movable radially with respect to the central axis (M) independently of the plurality of inner jaws (28); and / or The outer clamp (38) is secured to the exterior of the plurality of inner jaws (28); and / or The plurality of outer jaws (40, 42) are movable parallel to the central axis (M), preferably retractable and extendable.

7. The clamping system (24) according to claim 5 or claim 6, wherein: The plurality of external clamping jaws (40, 42) include a plurality of first external clamping jaws (40) and a plurality of second external clamping jaws (42), The plurality of first external jaws (40) are arranged outside the plurality of internal jaws (28) so as to be distributed in a circumferential direction around the central axis (M), and the plurality of second external jaws (42) are arranged outside the plurality of first external jaws (40), and the plurality of second external jaws (42) are distributed in a circumferential direction around the central axis (M).

8. The clamping system (24) according to any one of claims 5 to 7, wherein: The external gripper (38) has a plurality of radial lifting cylinders (44) connected to the external clamping jaws (40, 42) for radially moving the plurality of external clamping jaws (40, 42) relative to the central axis (M), wherein, preferably, - each of the plurality of radial lift cylinders (44) is externally fastened to each of the plurality of internal jaws (28); and / or - each of the plurality of radial lifting cylinders (44) has a displacement measuring sensor; and / or - Each of the plurality of radial lifting cylinders (44) is connected to each of the outer clamping jaws (40, 42) for radially moving the two outer clamping jaws (40, 42).

9. The clamping system (24) according to any one of claims 5 to 8, wherein: The external clamp (38) has a plurality of axial lifting cylinders (46, 48), which are connected to the external clamping jaws (40, 42) for axially moving the plurality of external clamping jaws (40, 42) parallel to the center axis (M), wherein, preferably, each of the plurality of axial lifting cylinders (46, 48) is connected to each of the external clamping jaws (40, 42) for axially moving the external clamping jaws (40, 42).

10. The clamping system (24) according to claim 8 and claim 9, wherein: The plurality of radial lifting cylinders (44) are connected together with the outer clamping jaws (40, 42) to the plurality of axial lifting cylinders (46, 48) for radially moving the plurality of axial lifting cylinders (46, 48) relative to the central axis (M), wherein preferably: - each of the plurality of radial lift cylinders (44) is connected to each of the plurality of axial lift cylinders (46, 48) for radially moving the two axial lift cylinders (46, 48); and / or The plurality of axial lifting cylinders (46, 48) are connected between the plurality of radial lifting cylinders (44) and the outer clamping jaws (40, 42).

11. A device (10) for processing a label roll (12) having an annular roll core, wherein: The device (10) comprises A clamping system (24) according to any one of the preceding claims; A preferably stationary robot (20), preferably a multi-axis robot, particularly preferably a bent-arm robot, wherein the robot (20) carries the gripping system (24) as an end effector; and The device (10) comprises a handling device (22) configured to operate the robot (20) according to the distance between the label roll (12) and the gripping system (24) detected by the at least one distance sensor (34) for positioning the gripping system (24) to grip the label roll (12) by means of the internal gripper (26); and optionally, The handling device (22) is also configured to operate the robot (20) for positioning the clamping system (24) for clamping the label roll (12) by means of the internal clamp (26) further according to the detected or predetermined thickness of the label roll (12), preferably for adjusting the immersion depth of the internal clamp (26) in the roll core according to the thickness.

12. The device (10) according to claim 11, wherein: The at least one distance sensor (34) includes a plurality of distance sensors (34); and The processing device (22) is further configured to determine the orientation of the label roll (12) relative to the clamping system (24) based on the distances detected by the plurality of distance sensors (34), and - operating the robot (20) for aligning the clamping system (24) for clamping the label roll (12) by means of the internal clamp (26) according to the determined alignment, preferably for aligning the plurality of internal clamping jaws (28) parallel to the roll core to clamp the label roll (12).

13. The device (10) according to claim 11 or claim 12, wherein: The gripping system (24) or the robot (20) comprises a camera (36), preferably a 2D or 3D camera, for photographing the label roll (12), and The processing device (22) is further configured to: determine the position of the label roll (12) according to the shooting of the camera (36); and operating the robot (20) to position the gripping system (24) according to the determined position to grip the label roll (12) by means of the internal gripper (26); and / or - Determining the positions of a plurality of label rolls (12) within the roll stack based on the images taken by the camera (36), and operating the robot (20) to position the clamping system (24) so ​​as to clamp the corresponding uppermost label roll (12) of the roll stack with the aid of the internal clamp (26) based on the determined positions.

14. The device (10) according to any one of claims 11 to 13, wherein: The clamping system (24) further comprises an external clamp (38) which is preferably pneumatic, and has a plurality of external clamping jaws (40, 42) which are distributed outside the plurality of internal clamping jaws (28) in a circumferential direction around the central axis (M) and are radially movable relative to the central axis (M) to fix the label roll (12) on the outer peripheral surface of the label roll (12). The outer gripper (38) has a plurality of radial lifting cylinders (44) connected to the outer jaws (40, 42) for radially moving the outer jaws (40, 42) relative to the central axis (M), The plurality of radial lift cylinders (44) each have a displacement measuring sensor, and The processing device (22) is also configured to - determine the diameter of the label roll (12) fixed to the outside by means of the external clamping jaws (40, 42) based on the signal output of the distance measuring sensor; and optionally, - comparing the determined diameter with a set diameter of the label roll (12) to identify the correct positioning of the plurality of outer jaws (40, 42); and / or - The diameter is determined several times in succession on the same label roll (12) in order to detect expansion and contraction of the label roll (12) if the diameter decreases.

15. A method for operating a clamping system (24) according to any one of claims 1 to 10 or a device (10) according to any one of claims 11 to 14, wherein: The method comprises: detecting at least one distance between the clamping system (24) and the label roll (12) by means of the at least one distance sensor (34); Positioning and / or aligning the inner gripper (26) to the annular core of the label roll (12) according to the detected at least one distance, preferably with the aid of a robot (20); After positioning and / or alignment, the label roll (12) is internally clamped on the inner circumferential surface of the roll core by the plurality of internal clamping jaws (28) of the internal clamp (26), preferably by elastic prestressing of the plurality of internal clamping jaws (28); and optionally: The internally clamped label roll (12) is fixed to the outer peripheral surface of the label roll (12) by a plurality of external clamping jaws (40, 42) of an external clamp (38) of the clamping system (24); and / or regulating the clamping force of the inner clamp (26) by means of a preferably pneumatic pressure control valve (32); and / or During the transfer of the label roll between the internal gripper (26) and the clamping shaft (18), the internal gripper (26) is aligned with the clamping shaft (18) of the roll holder (16), preferably so that the plurality of internal jaws (28) can be immersed in the gaps between the clamping elements of the clamping shaft (18).

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