Turret winder, system, and method

Abstract

A turret winder comprises: two roll receptacles (2, 3) each designed for holding and mounting a material roll (27, 35), the roll receptacles (2, 3) being formed on a swivel wheel (30); an area securing device (4), the area securing device (4) being designed to delimit a working area (26), which can be entered by an operator, from a machine area (38), which cannot be entered by an operator, wherein the area securing device (4) has a scanner (6) that can be moved along an axis (5).

Description

[0001] Turret winder, system and process

[0002] The present invention relates to a turret winder, in particular for a printing press. Furthermore, the invention relates to a system comprising such a turret winder and a method for producing windable products.

[0003] A turret winder, e.g. for a printing press, is used in particular to wind up printed products produced by the printing press (winding up) or to unwind material webs fed to the printing press as a material roll (unwinding).

[0004] For this purpose, the turret winder has two roll holders, each designed to hold and store a roll of material. The roll holders are mounted on a swivel wheel. The swivel wheel serves to swivel the material rolls from a position facing the printing press, in which the material roll is used by the printing press, to a position facing away from the printing press, in which the material roll can be replaced.

[0005] Turret winders are equipped with an area protection device. This device is designed to demarcate a work area that an operator may enter from a machine area that an operator may not enter. Optical systems, such as light barriers, are often used for this purpose.

[0006] Conventional turret winders often feature a fixed light barrier for area protection, which protects the entire swivel range of the winder, i.e., the swivel wheel including the material rolls it holds. Furthermore, such turret winders typically feature a second light barrier and a mechanical grid for additional area protection, located between the roll holders of the swivel wheel. This additional area protection protects the material roll being processed, facing the printing press, from the outer winding station or roll holder.

[0007] The disadvantage is that two separate systems are used for area protection and, in particular, area protection arranged between the roller holders makes access to the swivel wheel and maintenance of the swivel wheel more difficult.

[0008] Against this background, the present invention is based on the technical problem of providing a turret winder that reliably enables area protection, in particular area protection that has fewer components and / or requires less installation space. Furthermore, a system with such a turret winder and a method for producing windable products are to be provided.

[0009] The technical problem described above is solved by the features of the independent claims. Further embodiments of the invention emerge from the dependent claims and the following description.

[0010] According to a first aspect, the invention relates to a turret winder with two roll holders, each configured to hold and store a roll of material. The roll holders are formed on a swivel wheel. The device for area protection is configured to demarcate a work area that may be entered by an operator from a machine area that may not be entered by an operator. The turret winder is characterized in that the device for area protection comprises a scanner that can be moved along an axis.

[0011] The movable scanner replaces the light barrier described above, as well as the light barrier located between the roll holders, including the mechanical grid. This eliminates the area security components located between the roll holders, freeing up space between the roll holders and improving accessibility for maintenance and assembly. The light barrier for securing the entire dispensing area can also be eliminated, allowing the area security devices described above to be completely replaced by the movable scanner. According to one design of the turret winder, no additional area security device, such as a stationary light barrier or the like, is provided in addition to the scanner that can be moved along the axis.

[0012] The scanner, together with the axis, therefore forms a dynamically positionable light barrier that can be positioned to secure different areas depending on the operating mode of the turret winder.

[0013] It can be provided that the working area and the machine area are defined depending on an operating mode, wherein the scanner is arranged at a first position of the axis for a first operating mode, wherein the swivel wheel and the material rolls are arranged completely within the machine area, and wherein the scanner is arranged at a second position of the axis for a second operating mode, wherein the swivel wheel is not arranged completely within the machine area, wherein one of the roll holders is arranged within the machine area and one of the roll holders is arranged outside the machine area and within the working area.

[0014] In the first operating mode, the entire swivel range of the swivel wheel, including both winding stations or roll holders, is protected from the scanner or, from the operator's perspective, is located behind a scanning plane of the scanner. In the first operating mode, the scanning plane is at a distance from the swivel wheel, viewed in the longitudinal direction of the axis.

[0015] In the second operating mode, only one of the roll holders, specifically the one facing the printing press, is protected by the scanner or, from the operator's perspective, is located behind a scanning plane of the scanner. The roll holder facing the operator is therefore accessible for handling and assembly work. In the second operating mode, the scanner's scanning plane runs between the roll holders of the swivel wheel.

[0016] The scanner can be configured for person detection and linked to an emergency stop function. If a person enters the machine area, a machine stop or emergency stop is triggered.

[0017] With reference to the turret winder in question, a distinction was previously made between a machine area and a work area, with reference to "entry" of these areas by a person. The term "entry" encompasses not only the passage of a person or operator into the area in question, but also any intervention or reaching into or reaching into this area by a person. This means that it is already recognized if only a hand, arm, head, or foot of a person exceeds or injures the relevant area boundary.

[0018] When we talk about a storage of the material roll on the turret winder, this means that the material roll is mounted on a frame of the turret winder so that it can rotate about a rotation axis.

[0019] In particular, the material roll can be automatically inserted into a dedicated storage area of ​​the turret winder and also automatically removed from the turret winder. Corresponding systems for automated roll changing are known.

[0020] A respective roll holder can be configured to receive a material roll with a width of more than 50 cm, in particular to receive a material roll with a width of more than 100 cm, furthermore in particular to receive a material roll with a width of less than or equal to 250 cm.

[0021] Each roll holder can be designed to hold a roll of material weighing more than 100 kg.

[0022] The material roll can have a sleeve or winding shaft designed to receive a material web from the material roll. The respective sleeve or winding shaft of the material roll has, in particular, opposite end sections with which the material roll rests in the roll holder. Such a sleeve or winding shaft can be made of a metallic material.

[0023] A material web of the material roll can be a multi-layer material web or a single-layer material web. A material web of the material roll can have one or more layers of paper and / or plastic film and / or metal foil.

[0024] The thickness of a material web can be greater than or equal to 5 pm (micrometers) or 10 pm, in particular greater than or equal to 25 pm, and further in particular less than or equal to 1 mm. The scanner can be movable along an axis. The axis can be a controlled axis, in particular a numerically controlled axis.

[0025] A scanner's travel path can be defined as a straight line, allowing the scanner to be moved in a purely linear manner. According to alternative embodiments, a scanner's travel path can be defined as a circular arc or a wave-shaped profile. It is clear that achieving the inventive goal only requires that the scanner can assume various defined positions or be movable between various defined positions, with the type of travel path playing a subordinate role. The scanner can be pivotably mounted and pivotable about an axis or pivotable along a pivot path.

[0026] The axis for moving the scanner can be a linear axis, such as a ball screw, a toothed belt axis, a rack and pinion axis, a pneumatic linear axis, or the like.

[0027] The scanner can be held, in particular, by means of a mount on a movable carriage of the linear axis. The mount can, in particular, comprise one or more sheet metal components, which can, in particular, be detachably connected to the movable carriage, for example, by screwing.

[0028] The linear axis can be attached to a stationary frame of the turret winder. In particular, the linear axis can be detachably connected to the stationary frame of the turret winder, for example, by screwing. The linear axis can be attached to the stationary frame of the turret winder by means of an axis mount. The axis mount can, for example, comprise a sheet metal part, in particular an angled sheet metal part or the like.

[0029] The linear axis can be arranged perpendicular to a rotational axis of the material roll when viewed from above. This allows the scanner to be moved along the entire thickness or diameter of the material roll. The length of the linear axis can be greater than the maximum permissible thickness of the material roll.

[0030] According to one embodiment of the turret winder, the linear axis together with the movable scanner is arranged above the material roll when viewed in the vertical direction, in particular, measured from a hall floor on which the turret winder is installed, more than 2 m above the hall floor.

[0031] The axis may include a device for determining the scanner's position along the axis, such as a rotary encoder, a displacement encoder, or the like. Certain axes already have displacement measuring systems integrated into the axis design. However, it may also be possible for an axis to be used in combination with a separate device for determining an axis position.

[0032] For example, it can be provided that a device for determining an axial position of the scanner has a stationary rack and a pinion that can be moved with the scanner, wherein the pinion is in engagement with the rack and wherein a rotary encoder is assigned to the pinion in order to determine a longitudinal position of the scanner along the rack on the basis of a measured rotation of the pinion.

[0033] For example, the axis can be a pneumatically movable linear axis with a corresponding movable carriage on which the scanner is mounted. Likewise, a previously described pinion can be mounted on the carriage in combination with the corresponding rotary encoder to record the position of the scanner along the linear axis based on the rotations of the pinion in engagement with an associated rack. It is understood that the rack extends parallel to the longitudinal extent or linear travel path of the linear axis.

[0034] It can be provided that the scanner can be moved by means of the axis along a distance greater than or equal to 100 cm and less than or equal to 400 cm.

[0035] The scanner can be a laser scanner, wherein the laser scanner covers a scanning angle greater than or equal to 90°, in particular greater than or equal to 180°, in particular greater than or equal to 270°. Alternatively or additionally, the laser scanner can have a range of more than 2 m and less than 5 m.

[0036] According to one embodiment of the turret winder, the area protection device can be configured to measure the diameter of the material roll. Known devices used in turret winders for measuring the diameter of a material roll include, for example, optically measuring distance sensors, such as a laser distance sensor. A disadvantage here is that laser distance sensors are not suitable for opaque or high-gloss materials. Depending on the nature of the material roll, manual user intervention is therefore required to determine the diameter or to synchronize or perform a roll change.

[0037] While stationary distance sensors or point sensors are only suitable for probing a single point of an outer diameter of a respective material roll and determining a corresponding distance thereto, from which in turn the diameter of the material roll can be deduced, the device in question, which has the scanner movable along the axis, is suitable for recording a large number of measuring points of the circumference of the material roll or the outer contour of the material roll as a whole in order to achieve a significantly more reliable and precise determination of the circumference of the material roll.

[0038] In addition to determining the diameter of the material roll, the scanner can also be set up to determine the diameter of a core or winding shaft of the material roll.

[0039] According to a further aspect, the invention relates to a system, a machine for producing windable products, such as a printing press for producing a printed product, an extrusion line for producing a film product, a tubing machine for producing a tubular product, or the like, comprising a turret winder for winding or unwinding a roll of material, wherein the turret winder is designed in accordance with the invention. It can be provided that the system has both a turret winder for winding a roll of material and a turret winder for unwinding a roll of material, both of which can be designed in accordance with the invention.

[0040] According to a further aspect, the invention relates to a method comprising the method steps: producing a windable product by means of a system according to the invention, wherein the scanner is used to monitor the machine area, wherein the scanner in particular triggers a machine stop by means of the emergency stop function if a person is detected in the machine area.

[0041] If the scanner is also used to measure a diameter of the material roll, one embodiment of the method comprises the step of measuring a diameter of the material roll by means of the movable scanner, wherein the scanner is moved by means of the axis during the measurement.

[0042] The invention is described in more detail below with reference to exemplary embodiments of the drawings. They show schematically:

[0043] Fig. 1 shows a turret winder according to the invention in a perspective view;

[0044] Fig. 2 shows a linear axis and a scanner of the turret winder from Fig. 1;

[0045] Fig. 3 is a side view of the linear axis and the scanner from Fig. 2;

[0046] Fig. 4 shows the turret winder from Fig. 1 in a side view in a section, with the scanner in a first end position;

[0047] Fig. 5 shows the turret winder from Fig. 1 in a side view in a section, with the scanner in a first measuring position;

[0048] Fig. 6 shows the turret winder from Fig. 1 in a side view in a section, with the scanner in a second measuring position;

[0049] Fig. 7 shows the turret winder from Fig. 1 in a side view in a section, with the scanner in a second end position;

[0050] Fig. 8. a printing system according to the invention;

[0051] Fig 9 shows a flow chart of a method according to the invention.

[0052] Fig. 1 shows a turret winder 1 according to the invention with a first roll holder 2 and a second roll holder 3. To simplify the following explanations, a Cartesian coordinate system x, y, z is introduced. The first roll holder 2 and the second roll holder 3 are each provided for holding and storing a respective associated roll of material, whereby in the present illustration, no roll of material is arranged in the respective roll holders 2, 3.

[0053] The roller holders 2, 3 are formed on a swivel wheel 30, which can be pivoted about an axis 32 by means of a drive 31 for roller changes. The swivel wheel 30 and the drive 31 are externally toothed and mesh with each other.

[0054] The turret winder 1 has a device 4 for area protection. The device 4 for area protection is also a device 4 for measuring the diameter of a material roll.

[0055] The device 4 has a scanner 6 that can be moved along an axis 5.

[0056] In this case, axis 5 is a pneumatic linear axis 5. The structure of the area protection device 4 is described in more detail below with reference to Figures 2 and 3. The area protection device 4 is shown individually in Fig. 2 in an enlarged perspective view. The area protection device 4 is shown individually in Fig. 3 in a side view.

[0057] The pneumatic linear axis 5 is assigned a device 7 for determining an axis position of the scanner 6 (Fig. 3).

[0058] The device 7 for determining the axis position of the scanner 6 has a rotary encoder 8, a pinion 9 and a rack 10.

[0059] The rack 10 and the linear axis 5 are fixedly connected to a frame 11 of the turret winder 1 and are oriented parallel to each other when viewed along their longitudinal extent.

[0060] The pinion 9 engages with the rack 10, and the pinion 9 is held on a shaft 12 of the rotary encoder 8. The rotary encoder 8, together with the scanner 6, is attached to a movable carriage 13 of the pneumatic linear axis 5 by means of a holder 20. If the movable carriage 13 of the pneumatic linear axis 5 is now moved along the longitudinal extent L of the linear axis 5 (parallel to the x-axis), its linear, translational movement is converted into a rotation of the shaft 12 of the rotary encoder 8 by the rolling tooth engagement between the pinion 9 and the rack 10. Based on a measured angle of rotation of the rotary encoder 8, the longitudinal position of the scanner 6 in the x-direction can be determined based on the known gear geometry.

[0061] The pneumatic linear axis 5 has two spaced-apart end positions 14, 15. The end positions 14, 15 can also be referred to as end positions. Each end position 14, 15 is assigned a device 16, 17 for end position sensing.

[0062] The device 16 for end position sensing has a stationary component 18 in the form of a switching flag 18. The device 16 for end position sensing has a component 19 in the form of an electronic initiator 19 that can be moved by means of the axis 5. The initiator 19 is attached to the holder 20, to which the rotary encoder 8 and the scanner 6 are also attached.

[0063] The device 17 for end position sensing has a stationary component 21 in the form of a switching flag 21. The device 17 for end position sensing has a component 22 in the form of an electronic initiator 22 that can be moved by means of the axis 5. The initiator 22 is also attached to the holder 20.

[0064] As soon as the movable carriage 13 reaches one of the end positions 14, 15, the switching flag 18, 21 assigned to the respective end position 14, 15 is located on the front side directly in front of the initiator 19, 22 assigned to the respective end position 14, 15, which detects the assigned switching flag 18, 21 and in this way indicates that the respective end position 14, 15 has been reached.

[0065] The switching flag 21 is attached to an axle bracket 23, which also supports the axle 5 and the rack 10. The axle bracket 23 is attached to the frame 11.

[0066] Furthermore, a cable carrier 24 or energy chain 24 is provided, which is attached to the frame 11 by a further bracket 25. One end of the energy chain 24 is connected to the bracket 20 so that it is guided in the longitudinal direction L. The energy chain 24 serves in a known manner to carry cables that are required for the operation of the scanner 6, the rotary encoder 8, and the initiators 19, 22 and are connected to them.

[0067] The brackets 20, 23, 25 may comprise formed sheets and / or angles.

[0068] As can be seen from Fig. 1, the scanner 6 covers a scanning plane S which runs essentially parallel to the yz-plane and which is schematically represented by the dashed lines emanating from the scanner 6.

[0069] The scanner 6 can be moved parallel to the x-direction along a distance greater than 100 cm by means of the axis 5. The longitudinal extension L shown in Fig. 2 is therefore greater than 100 cm.

[0070] The scanner 6 is a laser scanner 6, which is capable of covering a scanning angle greater than 90°. The laser scanner 6 has a range of more than 2 m and less than 5 m.

[0071] Fig. 4 shows the linear axis 5 with the scanner 6 in the end position 15, which is sensed by the position sensing device 17 using the switching flag 21 and the initiator 22. To the right of the scanning plane S shown in Fig. 4 is a work area or operating area 26 in which people are located.

[0072] Fig. 4 shows a material roll 27 held in the roll holder 2. The material roll 27 has a sleeve 28, which can also be referred to as a winding shaft, on which a material web 29 is wound.

[0073] To measure a diameter d of the material roll 27, the scanner 6 is moved by means of the linear axis 5 at a constant speed in the direction of the material roll 27, wherein the position of the scanner 6 in the longitudinal direction or x-direction is measured by means of the rotary encoder 8.

[0074] In the position shown in Fig. 5, the scanner 6 detects the outer contour of the material roll 27 and continues to move to the position shown in Fig. 6, where the scanner 6 also detects the outer contour of the material roll 27. The diameter d can be calculated from the positions in the longitudinal direction or x-direction detected by the rotary encoder 8. Fig. 7 shows the scanner 6 in the end position 14, which is sensed by the end position sensing device 16 using the switching flag 18 and the initiator 19.

[0075] The area protection device 4 delimits the working area 26, which may be entered by an operator during machine operation, from a machine area 38, which may not be entered by an operator during machine operation.

[0076] Depending on the operating state or operating mode of the turret winder 1, the working area 26 and the machine area 38 can be different areas, as indicated in Figures 7 and 4.

[0077] The working area 26 and the machine area 38 are defined here depending on an operating mode, with the scanner 6 being arranged at a first position of the axis 5 for a first operating mode shown in Fig. 4, namely the end position 15 (see Fig. 1). The swivel wheel 30, the material roll 27, and the roll holders 2, 3 are arranged entirely within the machine area 38. According to Fig. 4, the scanning plane S is at a distance from the swivel wheel 30 when viewed in the longitudinal direction L.

[0078] For a second operating mode, the scanner 6 is arranged at a second position on the axis 5, namely the end position 14 (see Fig. 1). The working area 26 and the machine area 38 are therefore defined differently for the second operating mode than the first operating mode, since the scanner 6 has assumed a different position in the x-direction and the scanning plane S is therefore shifted in the x-direction.

[0079] For the second operating mode, the swivel wheel 30 is not arranged entirely within the machine area 38, but is partially accessible to an operator in the work area 26, with the roll holder 3 being arranged within the machine area 38 and the roll holder 2 being arranged outside the machine area 38 and within the work area 26. This allows a person to access the material roll 27 during operation while the material roll 35 is being used by a printing press 33 (see Fig. 8).

[0080] The scanner 6 can be configured for person recognition and coupled with an emergency stop function. Fig. 8 shows a schematic and highly simplified illustration of a printing system 34, with the printing press 33 for producing a printed product and with the turret winder 1 for winding or unwinding the material roll 27. Since this is a turret winder 1, an additional material roll 35 is shown as an example, which is held and mounted with its sleeve 36 in the roll holder 3 of the turret winder 1, with a material web 37 of the material roll 35 being used by the printing press 33.

[0081] A method can therefore be specified, comprising the method steps: (A) producing a printed product by means of the printing system 34; (B) wherein a diameter d of the material roll 27 is measured by means of the movable scanner 6 and wherein the scanner 6 is moved by means of the axis 5 during the measurement; and (C) wherein the scanner 6 is used to monitor the machine area 38 and wherein the scanner 6 triggers a machine stop by means of the emergency stop function if a person is detected in the machine area 38.

[0082] Reference symbol

[0083] 1 turret winder

[0084] 2 roll holders

[0085] 3 roll holder

[0086] 4 Device for measuring a diameter

[0087] 5 Linear axis / pneumatic linear axis

[0088] 6 scanners / laser scanners

[0089] 7 Device for determining the axis position

[0090] 8 rotary encoders

[0091] 9 pinions

[0092] 10 rack

[0093] 11 frame

[0094] 12 Wave

[0095] 13 sleds

[0096] 14 Final position

[0097] 15 End position

[0098] 16 Position query device

[0099] 17 Position query device

[0100] 18 Switch flag

[0101] 19 Initiator

[0102] 20 bracket

[0103] 21 Switch flag

[0104] 22 Initiator

[0105] 23 Bracket / axle bracket

[0106] 24 cable drag / energy chain

[0107] 25 bracket

[0108] 26 Operating area / working area

[0109] 27 Material roll 28 Core / winding shaft

[0110] 29 Material railway

[0111] 30 swivel wheel

[0112] 31 Drive

[0113] 32 Axis

[0114] 33 printing press

[0115] 34 printing system

[0116] 35 material roll

[0117] 36 Sleeve / winding shaft

[0118] 37 Material web

[0119] S Scan plane d Diameter x Coordinate axis y Coordinate axis z Coordinate axis

[0120] (A) Process step

[0121] (B) Process step

[0122] (C) Process step

Claims

Patent claims 1 . Turret winder, - with two roll holders (2, 3), each designed to hold and store a roll of material (27, 35), - wherein the roller receptacles (2, 3) are formed on a swivel wheel (30), - with a device (4) for securing the area, - wherein the device (4) for area protection is designed to delimit a working area (26) which may be entered by an operator from a machine area (38) which may not be entered by an operator, characterized in that - the device (4) for area protection has a movable scanner (6).

2. Turret winder according to claim 1, characterized in that the working area (26) and the machine area (38) are defined depending on an operating mode, wherein the scanner (6) is arranged in a first position for a first operating mode, wherein the swivel wheel (30) and the material rolls (27, 35) are arranged entirely within the machine area (38), and wherein the scanner (6) is arranged in a second position for a second operating mode, wherein the swivel wheel (30) is not arranged entirely within the machine area (38), wherein one of the roll holders (2, 3) is arranged within the machine area (38) and one of the roll holders (2, 3) is arranged outside the machine area (38) and within the working area (26).

3. Turret winder according to claim 1 or claim 2, characterized in that the scanner (6) is configured for person recognition and is coupled to an emergency stop function.

4. Turret winder according to one of the preceding claims, characterized in that the scanner is movable along an axis (5), in particular that the axis (5) is a linear axis (5), such as a ball screw drive, a toothed belt axis, a rack axis, a pneumatic linear axis (5) or the like, in particular that the linear axis (5) is arranged perpendicular to a rotation axis of the material roll (27, 35) when viewed in a plan view.

5. Turret winder according to claim 4, characterized in that the axis (5) has a device (7) for determining an axis position of the scanner (6) along the axis (5), such as a rotary encoder (8), a displacement encoder or the like.

6. Turret winder according to claim 4 and claim 5, characterized in that the device (7) for determining an axial position of the scanner (6) has a stationary rack (10) and a pinion (9) which can be moved with the scanner (6), wherein the pinion (9) is in engagement with the rack (10) and wherein a rotary encoder (8) is assigned to the pinion (9) in order to determine a longitudinal position of the scanner (6) along the rack (10) on the basis of a measured rotation of the pinion (9).

7. Turret winder according to one of the preceding claims 4 - 6, characterized in that the axis (5) has two mutually spaced end positions (14, 15) between which the scanner (6) can be moved, wherein each end position (14, 15) is assigned a device (16, 17) for end position query and wherein each device (16, 17) for end position query has in particular a stationary component (18, 21) and a component (19, 22) that can be moved by means of the axis (5).

8. Turret winder according to one of the preceding claims 4 - 7, characterized in that the scanner (6) can be moved by means of the axis (5) along a distance (L) greater than or equal to 100 cm and less than or equal to 400 cm.

9. Turret winder according to one of the preceding claims, characterized in that the scanner (6) is a laser scanner (6), wherein the laser scanner (6) in particular covers a scanning angle greater than or equal to 180°, in particular greater than or equal to 270° and / or wherein the laser scanner (6) in particular has a range of more than 2 m and less than 5 m.

10. Turret winder according to one of the preceding claims, characterized in that the device (4) for area protection is designed to measure a diameter of the material roll (27, 35).

11. System, with a machine (33) for producing windable products, such as a printing press for producing a printed product, an extrusion line for producing a film product, a hose machine for producing a hose product or the like, with a turret winder (1) for winding or unwinding a roll of material (27, 35), wherein the turret winder (1) is designed according to one of the claims described above.

12. Procedure, with the procedural steps: Manufacturing a windable product by means of a system (34) according to claim 11; the scanner (6) is used to monitor the machine area (38).

13. Method according to claim 12 and claim 10, characterized in that a diameter (d) of the material roll (27, 35) is measured by means of the movable scanner (6) and the scanner (6) is moved by means of the axis (5) during the measurement.

14. Method according to claim 12 or claim 13, characterized in that a position of the movable scanner (6) is adapted as a function of the diameter (d).

15. Method according to claim 13 or 14, characterized in that - the diameter of the material roll (27, 35) is measured by detecting two diametrical points on the material roll (27, 35) using the scanner; and / or the diameter of the material roll (27, 35) is measured by detecting a circumferential point on the material roll (27, 35) using the scanner (6), wherein the diameter is calculated using a known center point of the material roll (27, 35), wherein the center point has been measured in particular by means of a reference run of the scanner (6).

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