Device for clamping a roll of material and machine comprising the device

Abstract

The invention relates to a device (10) for clamping a roll of material (62) onto a rotatably mounted mandrel (12), in particular a labeling machine, comprising at least one elastomer body (14) extending along an axis of rotation (16) and having at least one through-opening (18) extending along the axis of rotation, at least one guide element (20) rotatable about the axis of rotation and extending at least partially through the through-opening, and at least one clamping element (22) attached to the guide element, characterized in that the clamping element is arranged at a radial distance (46) from the axis of rotation and extends to the elastomer body.wherein the clamping element is further pivotable about the axis of rotation at least between a first angular position and a second angular position by means of a rotation of the guide element, and the through-opening has a first radius (48) at the first angular position and a second radius (50) at the second angular position, which is smaller than the first radius and the distance, so that the elastomer body is pressed radially outwards at least at the second angular position when the clamping element is arranged in the second angular position. The invention provides a device that has reduced complexity, can be manufactured cost-effectively, and requires little maintenance.

Description

[0001] The invention relates to a device for clamping a roll of material and a machine comprising the device.

[0002] Material rolls, such as label rolls, can be used to transport flat materials, for example, labels, in a compact form. To remove the material from the rolls, the rolls can be mounted along their longitudinal axis on rotating mandrels to unwind the material. Mounting the material rolls can be simplified by using mandrels with a smaller diameter than the corresponding opening of the material roll. Once the material roll is mounted on a mandrel, it can be clamped to the mandrel using a clamping mechanism.

[0003] It is known from EP 3 663 215 B1 that a mandrel has a support system for material rolls, which has a segmented cylindrical outer skin. A roller mechanism is arranged under the segments of the outer skin, with which at least some of the segments of the outer skin can be moved outwards to clamp a material roll arranged on the mandrel.

[0004] The object of the invention is therefore to provide a device that has reduced complexity, can be manufactured cost-effectively and can be maintained with little effort.

[0005] The problem is solved by the features of the independent claims. Advantageous further developments are the subject of the dependent claims and the following description.

[0006] In a device for clamping a roll of material onto a rotatably mounted mandrel, in particular a labeling machine, comprising at least one elastomer body extending along an axis of rotation and having at least one through-opening extending along the axis of rotation, at least one guide element rotatable about the axis of rotation and extending at least partially through the through-opening, and at least one clamping element attached to the guide element, the clamping element is arranged at a radial distance from the axis of rotation and extends to the elastomer body, wherein the clamping element is further pivotable by means of a rotation of the guide element at least between a first angular position and a second angular position about the axis of rotation, and the through-opening has a first radius at the first angular position and a second radius at the second angular position.which is smaller than the first radius and the distance, so that the elastomer body is pressed radially outwards at least at the second angular position when the clamping element is arranged in the second angular position.

[0007] The invention provides a device with which an elastomer body can be pressed outwards with the clamping element to clamp a roll of material onto a mandrel. The clamping element is rotatable about the axis of rotation with a guide element at least between a first angular position and a second angular position, and is arranged at a radial distance from the axis of rotation. That is, in the radial direction, the clamping element is spaced from the axis of rotation and can project from the guide element. This distance can be measured from the axis of rotation to a contact surface of the clamping element with the elastomer body. Furthermore, the guide element with the clamping element is arranged in a through-opening of the elastomer body, with the clamping element extending from the guide element to the elastomer body. The clamping element thus has a contact surface with which it touches the wall of the through-opening.The elastomer body extends circumferentially around the guide element and the clamping element. It also extends around the axis of rotation. At the through-hole, the elastomer body has a first radius at the first angular position of the clamping element and a second radius at the second angular position. The first radius is larger than the second radius. Furthermore, the second radius is smaller than the radial distance. This means that when the clamping element is in the second angular position, the elastomer body is pushed outwards at the through-hole by the clamping element by the difference between the second radius and the radial distance. The material of the elastomer body is displaced by the clamping element. Since the material of the elastomer body is incompressible, the elastomer body expands radially, at least at the second angular position, and can therefore clamp a surrounding roll of material.When the clamping element is in the first angular position, the outward expansion of the elastomer body can be reduced to such an extent that a surrounding roll of material is detached from the device. The invention thus provides a simply constructed device that is inexpensive to manufacture and easy to maintain.

[0008] The clamping element can, for example, slide or roll along a wall of the through-opening of the elastomer body between the first angular position and the second angular position.

[0009] According to one example, it is conceivable that the elastomer body may have at least one receptacle for the clamping element arranged at the through-opening in the first angular position and / or in the second angular position.

[0010] This allows the clamping element to be received by the corresponding receptacle at the appropriate angle. This enables the clamping element to be easily and securely locked in place by positioning it in the receptacle. The elastomer body can be clamped by positioning the clamping element in the receptacle according to the toggle lever principle. The clamping element can thus be positioned at the appropriate angle with minimal effort and high accuracy.

[0011] According to another example, it is conceivable that the elastomer body at the through-opening may have a running and / or sliding surface for the clamping element, which may extend between the first angular position and the second angular position.

[0012] This allows the wall of the opening to have a gradually decreasing radius from the first circumferential angular position to the second. By moving the clamping element circumferentially from the first reset position to the second angular position, the clamping force exerted by the clamping element on the elastomer body can therefore be gradually increased. The running and / or sliding surface can be understood as a curved track along which the clamping element is guided during circumferential movement. This simplifies the actuation of the clamping element and protects the elastomer body.

[0013] Furthermore, it is conceivable, for example, that the elastomer body may have at least one radial projection extending into the through-opening, which may limit the running and / or sliding surface in the circumferential direction.

[0014] The projection thus provides a stop that, in the circumferential direction, creates an obstacle or a positive locking mechanism to prevent movement of the clamping element in that direction. The clamping element cannot be moved over the projection, or only with increased force. This allows for even greater accuracy in positioning the clamping element in the first and second angular positions.

[0015] According to another example, it is conceivable that the elastomer body can have at least two segments, in particular disc elements, each extending around the axis of rotation and stacked along the axis of rotation.

[0016] The segments can be made of a rubber material, for example, cut or stamped from a sheet. The segments can be round and have a central opening. All segments can be identical. When the segments are stacked, their openings can be aligned, thus forming the opening of the entire elastomer body. This allows for the simple production of the elastomer body using cost-effective material. Furthermore, damage to the elastomer body can be repaired with minimal effort.

[0017] The elastomer body can, for example, have at least one recess which is arranged on an outer surface of the elastomer body pointing away from the axis of rotation, preferably at the second angular position.

[0018] The recess can, for example, be a slot located on an outer surface of the elastomer body. This allows material to be pressed into the slot during expansion of the elastomer body by the clamping element in the second angular position, enabling the areas of the elastomer body located circumferentially next to the slot to be pushed radially outwards with minimal force. Thus, during radial expansion of the elastomer body in the second angular position, the slot can be at least slightly unfolded, thereby facilitating this radial expansion.

[0019] Furthermore, it is conceivable that the device may have at least one retaining element mounted radially spaced and non-rotatably to the axis of rotation, which has a positive locking connection with the elastomer body between the first and second angular positions in the radial direction.

[0020] The retaining element holds a section of the elastomer body between the first and second angular positions during radial expansion. This reduces radial expansion in the held sections compared to the sections at the second angular position. This allows for increased radial expansion in the sections at the second angular position, as the elastomer material must deflect around the retaining element during circumferential radial expansion. For example, if two retaining elements are used, with the second angular position located between them (from a perspective of the axis of rotation), the material flow during radial expansion can be channeled by the retaining elements to the sections of the elastomer body at the second angular position.This allows the radial expansion of the elastomer body at the second angular position to be increased.

[0021] The clamping element can, for example, be designed as a roller or cylinder that is rotatably arranged on the guide element about a longitudinal axis arranged eccentrically to the axis of rotation.

[0022] The clamping element can therefore be made from a round material and arranged on the guide element without bearings. The longitudinal axis of the round material can be aligned parallel to the axis of rotation. This allows for a simple, robust design that requires minimal maintenance.

[0023] According to another example, it is conceivable that the device may have a central roller or cylinder which is rotatable in the guide element about the axis of rotation and is radially coupled to the roller or cylinder.

[0024] The roller and the central roller roll against each other when the clamping element is moved between the first and second angular positions. If several clamping elements are provided, each designed as a roller, all rollers can roll on the central roller when the guide element is rotated.

[0025] The device can, for example, have at least two limiting elements that restrict the elastomer body to limit an axial expansion of the elastomer body in the axial direction, wherein the elastomer body is arranged between the two limiting elements.

[0026] The two limiting elements can, for example, be two metal discs between which the elastomer body is clamped. The limiting elements can be connected to each other, for example, by the retaining elements described above. This prevents axial expansion of the elastomer body by the limiting elements. This allows for further expansion in the radial direction.

[0027] According to another example, it is conceivable that the device could have a rotary drive for rotating the guide element around the axis of rotation.

[0028] The rotary drive allows the guide element to be automatically rotated to clamp and release a roll of material.

[0029] The invention further relates to a machine for transferring material from a material roll to objects, in particular a labeling machine, comprising at least one roll carrier system for the material roll with at least one mandrel for insertion into an opening of the material roll and at least one device according to one of the preceding claims, wherein the device forms at least a part of the mandrel.

[0030] The advantages, effects, and further developments of the machine result from the advantages, effects, and further developments of the device described above. To avoid repetition, reference is therefore made to the preceding description in this regard.

[0031] The invention is described below with reference to an exemplary embodiment and the accompanying drawing. The drawing shows: Figure 1 is a schematic representation of the machine; Figure 2 is a schematic representation of the device; Figure 3a is a detailed schematic representation of different assembly times of the device; and Figure 4a is a schematic representation of the clamping process with the device.

[0032] In Figure 1 Figure 1 shows a machine designed to transfer material from a material roll 62 onto objects. The machine as a whole is represented by the reference symbol 60.

[0033] The machine 60 can be configured as a labeling machine. The material rolls 62 can be carrier tape rolls, onto which labels may be attached or from which labels may have been removed. The material rolls 62 are arranged on mandrels 12, which are rotatably mounted on a support system 64. Devices 10 for clamping the material rolls 62 are arranged on the mandrels 12.

[0034] The device 10 is shown in a schematic external representation in its entirety in Figure 2 The device 10 has an elastomer body 14 which, together with a housing 15 which can be placed on the device 10 in a cap-like manner, can form the mandrel 12.

[0035] The elastomer body 14 can be clamped between two limiting elements 52, 54. A first limiting element 52 can be arranged below the elastomer body 14 and a second limiting element 54 above the elastomer body 14. The housing 15 can be placed on the second limiting element 54.

[0036] Furthermore, the limiting elements 52, 54 can be made of a rigid material and limit the expansion of the elastomer body 14 in a direction towards the housing 15 or away from the housing 15.

[0037] The elastomer body 14 can be formed from several segments 32-38, for example, disc elements. The segments 32-38 can be made of a rubber material. The segments 32-38 can be stamped or cut from a sheet-shaped rubber material.

[0038] In the Figures 3a to 3f Individual expansion stages of device 10 are shown. As in the Figures 3b and 3c The elastomer body 14 is shown to have a through-opening 18.

[0039] The device 10 has at least one guide element 20, which is at least partially arranged in the through-opening 18. The guide element 20 is rotatably mounted. It can be connected to the Figure 2 The rotary drive 56 shown is driven.

[0040] Furthermore, the device has at least one clamping element 22. The clamping element 22 can, for example, be a projection extending radially away from the guide element 20. Alternatively, the clamping element 22 can be designed as a roller rotatable about a longitudinal axis 23.

[0041] The clamping element 22 extends to a wall of the through-opening 18. The clamping element 22 has a contact surface that is in contact with the wall of the through-opening 18. The clamping element 22 is also positioned at a distance from the axis of rotation 16. In this example, the distance is measured from the contact surface with the wall of the through-opening 18 to the axis of rotation 16. The distance of the clamping element 22 to the axis of rotation 16 does not change when the guide element 20 rotates in this example.

[0042] In this example, three clamping elements 22 are shown. However, the device 10 can have any number of clamping elements 22.

[0043] The elastomer body 14 can be further fixed in a radial direction by means of retaining elements 42. According to Figure 3a The retaining elements 42 can be connected to the first limiting element 52.

[0044] Segments 32-38 can have openings through which the retaining elements 42 can be guided. During assembly, segments 32-38 with the through-opening 18 can be arranged over the guide element 20 and the clamping elements 22, and the retaining elements 42 can be guided through the openings. In this way, segments 32-38 can be stacked on top of each other, as shown in Figure 3c is shown.

[0045] What's next in 3D figureAs shown, the second limiting element 54 can then be connected to the retaining elements 42. This can be done, for example, with screws or other fasteners. A shaft 58 can be arranged on the guide element 20, which can act as a centering element for the housing 15. This is, for example, Figure 3e depicted.

[0046] Figure 3f Figure 1 shows a longitudinal section of the device 10 along the axis of rotation 16. The rotary drive 56 can be arranged on the side of the device 10 opposite the housing 15.

[0047] In the Figures 4a to 4cThe clamping of a material roll 62 using the device 10 is shown in individual steps. Instead of the material roll 62 itself, only the circumference of its opening, into which the mandrel 12 can be inserted, is shown. Furthermore, these figures illustrate an example in which no holding elements 42 are provided. However, the explanations for this example apply analogously to an example that has at least one holding element 22.

[0048] In Figure 4a The clamping elements 22 are each arranged in their first angular position. The distance of the clamping elements to the axis of rotation 16 is indicated by reference numeral 46. The distance 46 is defined up to the contact surface between the clamping element 22 and the elastomer body 14. In the first angular position, the wall of the through-opening 18 can have a first recess 24. The recess 24 has a first radius at its lowest point, extending from the axis of rotation 16, which is defined according to Figure 4c is designated with the reference number 48.

[0049] A second mounting point 26 is arranged at the position of the second angular position. The second radius of the second mounting point 26 is referenced with the reference symbol 50 and marks the lowest point of the mounting point 26 starting from the axis of rotation 16.

[0050] The second radius 50 is smaller than both the first radius 48 and the radial distance 46. The first radius 48 can, for example, be less than or equal to the radial distance 46. However, this does not preclude the possibility that the first radius 48 could also be larger than the radial distance 46.

[0051] When the clamping element 22 is arranged in the second angular position, the elastomer body 14 is therefore bulged radially outwards in the region of the second angular position. This is exemplified in Figure 4c depicted.

[0052] The elastomer body 14 presses against the material roller 62 in this area. The overlap between the elastomer body 14 and the radius of the opening of the material roller 62 exemplifies the radial expansion of the elastomer body 14. The material roller 62 is not physically present in this figure, so the overlap merely shows that the elastomer body 14 is able to clamp the material roller 62.

[0053] A running and / or sliding surface 28 is arranged on the wall of the passage opening 18 between the first mounting 24 and the second mounting 26. The corresponding clamping element 22 can, for example, roll or slide along the running and / or sliding surface 28 when the clamping element 22 is moved between the first angular position and the second angular position. This is, for example, Figure 4b depicted.

[0054] In this example, the clamping elements 22 are designed as rollers. They can roll off a central roller 44, which can extend along the axis of rotation 16 and is rotatable about it. The central roller 44 can be arranged in the guide element 20.

[0055] The radius of the running and / or sliding surface 28 decreases from the first receptacle 24 to the second receptacle 26. Adjacent to the second receptacle 26, the sliding surface 28 can have a radius smaller than the second radius 50. Therefore, at the transition from the running and / or sliding surface 28 to the second receptacle 26, the clamping element 22 can act on the elastomer body 14 according to the toggle lever principle.

[0056] A projection 30 can adjoin the second receptacle 26 and the first receptacle 24, respectively, and extends radially from the elastomer body 14 into the through-opening 18. The projection 30 can act as a stop when the clamping element 22 is positioned in the first receptacle 24 or the second receptacle 26. Starting from a movement of the clamping element 22 away from the running and / or sliding surface 28, precise positioning of the clamping element 22 in the receptacle 24, 26 can thus be achieved.

[0057] The elastomer body can further have recesses 40 on its outer surface oriented towards the material roll 62, which can, for example, be designed as slots. The recesses 40 can extend parallel and radially to the axis of rotation 16. They can also be arranged at the angular position of the second radius 50 or the second receptacle 26. When the clamping element 22 is arranged in the second angular position, the recesses 40 can be unfolded in the elastomer body 14 by the generated tension. This can facilitate the expansion of the elastomer body 14 in the radial direction.

[0058] The example described above does not in any way limit the invention. Rather, the invention can be modified in numerous ways. All features of the invention described above can be essential to the invention, either alone or in combination. Reference symbol list

[0059] 10 Device 12 Mandrel 14 Elastomer body 15 Housing 16 Rotary axis 18 Through opening 20 Guide element 22 Clamping element 24 First mount 26 Second mount 28 Running and / or sliding surface 30 Projection 32 Segment 34 Segment 36 Segment 38 Segment 40 Recess 42 Retaining element 44 Central roller 46 Radial distance 48 First radius 50 Second radius 52 First limiting element 54 Second limiting element 56 Rotary drive 58 Shaft 60 Machine 62 Material roller 64 Support system

Claims

1. Device (10) for clamping a material roll (62) on a rotatably mounted mandrel (12), in particular a labeling machine, comprising at least one elastomer body (14) which extends along a rotational axis (16) and has at least one through-opening (18) extending along the rotational axis (16), at least one guide element (20) which is rotatable about the rotational axis (16) and which extends at least partially through the through-opening (18), and at least one clamping element (22) which is fastened to the guide element (20), characterized in thatthe clamping element (22) is arranged at a radial distance (46) from the axis of rotation (16) and extends as far as the elastomer body (14), wherein the clamping element (22) is further pivotable about the axis of rotation (16) by means of a rotation of the guide element (20) at least between a first angular position and a second angular position, and the through-opening (18) has a first radius (48) at the first angular position and a second radius (50) at the second angular position, which is smaller than the first radius (48) and than the distance (46), so that the elastomer body (14) is pressed radially outwards at least at the second angular position when the clamping element (22) is arranged in the second angular position.

2. Device (10) according to claim 1, characterized in thatthe elastomer body (14) has at least one receptacle (24, 26) for the clamping element (22) arranged at the through opening (18) at the first angular position and / or at the second angular position.

3. Device (10) according to claim 1 or 2, characterized in that the elastomer body (14) has a running and / or sliding surface (28) for the clamping element (22) at the through opening (18), which extends between the first angular position and the second angular position.

4. Device (10) according to claim 3, characterized in that the elastomer body (14) has at least one projection (30) projecting radially into the through-opening (18) and delimiting the running and / or sliding surface (28) in the circumferential direction.

5. Device (10) according to one of the preceding claims, characterized in thatthe elastomer body (14) has at least two segments (32, 34, 36, 38), in particular disc elements, which each extend around the axis of rotation (16) and are arranged stacked along the axis of rotation (16).

6. Device (10) according to one of the preceding claims, characterized in that the elastomer body (14) has at least one recess (40) which is arranged on an outer surface of the elastomer body (14) facing away from the axis of rotation (16), preferably at the second angular position.

7. Device (10) according to one of the preceding claims, characterized in that the device (10) further comprises at least one holding element (42) which is radially spaced apart and mounted in a rotationally fixed manner to the axis of rotation (16) and which has a positive connection with the elastomer body (14) in the radial direction between the first and second angular positions.

8. Device (10) according to one of the preceding claims, characterized in thatthe tensioning element (22) is designed as a roller or cylinder which is arranged on the guide element (20) so as to be rotatable about a longitudinal axis (23) arranged eccentrically to the axis of rotation (16).

9. Device (10) according to claim 8, characterized in that the device (10) has a central roller (44) or cylinder which is rotatably mounted in the guide element (20) about the axis of rotation (16) and is rotationally coupled to the roller or cylinder in the radial direction.

10. Device (10) according to one of the preceding claims, characterized in that the device (10) has at least two limiting elements (52, 54) which limit the elastomer body (14) for limiting an axial extension of the elastomer body (14) in the axial direction, wherein the elastomer body (14) is arranged between the two limiting elements (52, 54).

11. Device (10) according to one of the preceding claims, characterized in thatthe device (10) has a rotary drive (56) for rotating the guide element (20) about the axis of rotation (16).

12. Machine (60) for transferring material from a material roll (62) to objects, in particular a labeling machine, comprising at least one roll support system (64) for the material roll (62) with at least one mandrel (12) for insertion into an opening of the material roll (62) and at least one device (10) according to one of the preceding claims, wherein the device (10) forms at least part of the mandrel (12).

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