Device for producing a cotton wrap

Description

[0001] The invention relates to a device for producing a lap roll from a plurality of fiber slivers, comprising a machine frame and at least one drafting system with a pair of input rollers and a pair of output rollers, as well as a calendering unit and a winding unit. The at least one drafting system is designed to draft the fiber slivers and form a pre-lap web. The calendering unit for forming the lap web is arranged downstream of the at least one drafting system. After their production, the lap rolls are fed to a combing machine and serve as a template for the production of combed yarns. The quality and uniformity of the produced lap rolls thus directly influence the quality of the fiber strands resulting from the combing process.

[0002] Generic devices for producing a cotton roll are known, for example, from GB 778 404 A, DE 10 2016 100990 A1, CH 695 500 A5 and EP 0 679 740 A1.

[0003] Another generic device for producing a lap roll is known, for example, from EP 0 718 422 A1. A plurality of fiber slivers are fed to the device. The fiber slivers are taken from provided cans and fed to a drafting system as a fiber sliver sheet. In the disclosed device, a fiber sliver sheet is processed in each of two drafting systems and converted into a pre-lap web. A fiber sliver sheet is understood to be the arrangement of the fiber slivers upstream of a drafting system, where the fiber slivers are placed next to one another and fed into an input roller of the drafting system. The pre-lap webs from the two drafting systems are then stacked on top of one another and fed to a third drafting system. After the third drafting system, the pre-lap webs combined to form a pre-lap web are calendered. The calendering process is carried out as a multiple calendering process.During the calendering process, the pre-batting web is pressed through several clamping points between the individual calender rolls and guided to a winding unit. The winding unit is designed as a roller winder, with a lap roll being formed between two winding rolls on a core. A disadvantage of the disclosed device is the long distances traveled by the individual pre-batting webs before reaching the calendering stage. This circumstance also necessitates the third drafting system to achieve good quality of the pre-batting web and a uniformity of the fiber layers in the pre-batting web through a drafting process of the combined pre-batting webs. IN 2015CHE4024 A also discloses a device for producing a lap roll with a winding unit and two drafting systems for forming pre-batting webs.The drafting systems are located upstream of the winding unit, meaning the stacked pre-batting webs have to travel a long distance before entering the calendering system. The pre-batting webs are transported downstream of the drafting systems by calendering. The calendering process stretches the pre-batting webs, resulting in a loss of quality over long transport distances and the resulting high weight of the pre-batting webs being drawn. The tensile forces further stretch the pre-batting webs, which can lead to incorrect drafting. This incorrect drafting results in unevenly stretched pre-batting webs being fed into the calendering system. If the transport surfaces on which the pre-batting webs must be guided are not ideal due to the transport paths, the top layer of fibers in the pre-batting webs can also be damaged.

[0004] Furthermore, IN 2012CHE2812 A discloses a device for producing a lap roll with a winding unit and a multiple calendering unit without a pre-drawing system. The fiber slivers, which have already been appropriately drawn in a separate process, are fed directly from cans to the calendering unit. Here, too, it is disadvantageous that the individual fiber slivers travel different transport distances, which can lead to incorrect drafting.

[0005] It is therefore the object of the invention to design a feed of a pre-cotton web in such a way that the formation of a high-quality lap is possible and incorrect drafts are avoided.

[0006] To achieve this object, a device for producing a lap roll from a plurality of fiber slivers with a machine frame is proposed, wherein the device comprises at least one drafting system with a pair of input rollers and a pair of output rollers as well as a calendering and a winding unit. The at least one drafting system is designed to draft the fiber slivers and form a pre-lap web. The calendering is arranged downstream of the at least one drafting system to form the lap web. The at least one drafting system, the calendering and the winding unit are held in the machine frame. By combining the individual components of the device in a single machine frame, a compact design of the entire device is possible. This also results in the device requiring less space in a spinning preparation area or fiber preparation for the spinning mill.The travel path provided for the pre-batting web between the output roller pair of at least one drafting system and the inlet to a nip line formed in the calendering system is 200 mm to 500 mm. It has been shown that the best results in terms of batting quality are achieved with a travel path of the batting web from the output roller to the calendering system of 200 mm to 400 mm, in particular 300 mm. If the travel path is too long, exceeding 500 mm, the disadvantages of the prior art can only be remedied to a limited extent. If a shorter travel path is selected, the design complexity of the device increases. By creating the short travel path for the pre-batting web, incorrect drafting between the output roller pair of the drafting system and the inlet to the first nip line of the calendering system is avoided.The pre-wad web also has only minimal contact with guide elements between the output roller pair of the drafting system and the entry into the first nip line of the calendering, which minimizes damage to the surfaces of the pre-wad web.

[0007] The calendering process involves at least two rollers being pressed against each other to form a continuous web of pre-batting into a batting that is as compact as possible, which is then fed to the winding unit. The at least two calender rollers form a nip line between them, into which the pre-batting web is fed and formed into the batting web. Today, two different winders are generally used as winding units. Firstly, so-called roller winders are used, in which the batting rolls are formed on winding rollers. In the second version, so-called belt winders, the batting roll is formed in a circulating belt. In both belt winders and roller winders, one or more pairs of calender rollers are installed upstream of the actual winding process. The calendering process presses and compacts the batting webs before they enter the winding unit.

[0008] Advantageously, the drafting system has at least one intermediate roller pair between the input roller pair and the output roller pair. By inserting an intermediate roller pair between the input roller pair and the output roller pair, the drafting effect on the fiber slivers caused by the drafting system is divided into two zones. This creates a pre-draft zone between the input roller pair and the intermediate roller pair, and a main draft zone between the intermediate roller pair and the output roller pair. This allows for a higher draft or even the same total draft in smaller increments. The creation of multiple draft zones enables gentle drafting of the fiber slivers.

[0009] Preferably, two drafting systems are provided. By using two drafting systems, two pre-batting webs can be placed on top of each other to produce a batting web. The individual pre-batting webs are made of thinner fiber slivers, or the fiber slivers can be subjected to greater drafting in the drafting system. Both measures lead to higher quality of the pre-batting webs and thus to an improvement in the overall batting web. The pre-batting webs are placed on top of each other and combined into a batting web by calendering.

[0010] Advantageously, the drafting systems are arranged inclined in opposite directions. This arrangement has the advantage that the pre-batting webs formed by the drafting systems are subject to the same transport conditions until they are joined. It is advantageous if a travel path provided for a second pre-batting web between an output roller pair of the second drafting system and the inlet to the calendering system is also 200 mm to 500 mm. Accordingly, the travel path provided for the first pre-batting web between the output roller pair of the first drafting system and an inlet to the calendering system and the travel path provided for the second pre-batting web between an output roller pair of the second drafting system and the inlet to the calendering system are preferably the same. This has the advantage that both pre-batting webs are subject to the same conditions.Due to the short travel distances, incorrect distortions are largely avoided, whereby the stresses for both pre-cotton webs are at least identical, which counteracts possible irregularities in the cotton web to be formed.

[0011] Advantageously, drafting systems are arranged one above the other, and the pre-batting webs formed by the drafting systems are superimposed before calendering. Arranging the drafting systems vertically one above the other enables a compact and space-saving design and makes it possible to accommodate the drafting systems in the machine frame. Separate support for the drafting systems, as is common today, is no longer necessary. Furthermore, this geometric arrangement of the drafting systems allows the pre-batting webs to be superimposed before calendering without creating different paths for the individual pre-batting webs. Combining the pre-batting webs before calendering leads to precise introduction of the pre-batting webs into the calendering system, thus minimizing distortions or build-up as well as disturbances to the surfaces of the pre-batting webs at the inlet to the calendering system.

[0012] Preferably, calendering is carried out by a single pair of calender rolls forming a nip line. Compared to calendering with multiple nip lines, this has the advantage that the surfaces of the batting are not irritated by transport over multiple roll surfaces, thus avoiding damage to the surfaces of the batting or the fibers located on the surface. It has also been shown that, with a sufficiently high compressive force between the pair of calender rolls, such a single pressing of the batting is sufficient to achieve a high-quality batting roll. Depending on the properties of the pre-batting web before the pair of calender rolls and the requirements for the pressed batting after passing through the nip line, a clamping force of 8 kN to 30 kN is sufficient.

[0013] Preferably, an element for guiding the pre-batting web is provided upstream of the clamping line. This element serves to ensure precise insertion of the pre-batting web into the calendering clamping line. Guide rods, guide tables, or guide surfaces can be used as elements for guiding the pre-batting web. These can be sheet metal constructions or appropriately shaped or machined profiles. The pre-batting web can be guided over a guide surface or between two guide surfaces. If the pre-batting web is guided on both sides, rollers or rolls can also be used. The guide surfaces can be stationary or, in the case of rollers, can move along with the pre-batting web. It is advantageous if the distance between each outlet of the drafting system and the element for guiding the pre-batting web is the same.Here, too, the principle applies that only equal treatment of the pre-cotton webs can lead to the required high quality of the cotton web.

[0014] For further processing of the batting web, the winding unit has a rotating belt for winding the batting web onto a core, with at least five rollers rotatably mounted in the machine frame around which the belt rotates. In an alternative embodiment, the winding unit has a first winding roller and a second winding roller for winding the batting web onto a core and a shield, with the winding rollers rotatably mounted in the machine frame. Winding units of these alternative designs are known, with both embodiments being suitable for winding a batting web formed by the device according to the invention. For a more detailed description of the winding units, reference is made to the figures.

[0015] Further advantages of the invention are shown and described in more detail in the following exemplary embodiments. Figure 1 shows a schematic representation of a device for producing a cotton web according to the prior art; Figure 2 shows a schematic representation of a first embodiment of the device according to the invention; Figure 3 shows a schematic representation of a second embodiment of the device according to the invention; and Figure 4 shows a schematic representation of a third embodiment of the device according to the invention.

[0016] Figure 1shows a purely schematic representation of a device for producing a batting web 18 according to the prior art. The device comprises a first drafting system 6, a second drafting system 11 and a calendering system 17. A fiber sliver sheet 5 consisting of individual fiber slivers is fed to the first drafting system 6. The drafting system roller pairs of the first drafting system 6 form a first pre-batting web 10 from the fiber sliver sheet 5, which is guided away from the first drafting system 6 in the direction of the second drafting system 11 (shown by arrows). A fiber sliver sheet 5 consisting of individual fiber slivers is also fed to the second drafting system 11. The drafting system roller pairs of the second drafting system 11 form a second pre-batting web 15 from the fiber sliver sheet 5. The second pre-batting web 15 is then deposited onto the first pre-batting web 10.The stacked pre-batting webs 15 and 10 are then fed together in the running direction 16 to the calendering unit 17. The calendering unit 17 is shown as an example of a quadruple calender, in which the pre-batting web is guided through three clamping lines formed by four calender rolls. The calendering unit 17 forms the pre-batting webs 15 and 10 into the batting web 18. Due to the arrangement of the drafting units 6 and 11, the travel paths of the pre-batting webs 15 and 10 are different and are therefore subject to different tensile forces caused by transport.

[0017] The batting web 18 is then guided past the calendering stage 17 into a winding unit of a belt winder and wound onto a core 21 to form a batting roll 19 that is rotatably mounted about a stationary winding axis 20. The core 21 is driven by a revolving, endless belt 23, which forms a loop 26 between a deflection roller 24 and an opening roller 25, in which loop the core 21, or rather the batting roll 19, is received. In the present case, the batting roll 19 is driven counterclockwise in the direction of rotation 22 by the belt 23. The loop 26 of the belt 23 that wraps around the batting roll 19 becomes larger as the batting roll 19 grows, with the belt 23 being tensioned by a tension roller 29 throughout the entire winding process. The belt 23 is further guided over an ejection roller 27 and a guide roller 28.

[0018] Figure 2shows a schematic representation of a first embodiment of the device according to the invention. The device comprises a drafting system 6, a calendering system 17, and a winding unit, which are held in a common machine frame 30. The machine frame, in turn, stands on a foundation 31. Cans 1, which contain the fiber slivers 4 to be processed, are also mounted on the foundation 31. A creel 2 is provided above the cans 1. The fiber slivers 4 are conveyed from the cans 1 to the device via creel rollers 3 provided on the creel 2 and fed to the drafting system 6 as a fiber sliver sheet 5. In this case, the term sliver sheet 5 refers to a specific number of fiber slivers 4 that are arranged side by side. The drafting system 6 has an input roller pair 7 and an output roller pair 9.The fiber sliver sheet 5 is drafted by the drafting system 6, or rather the drafting system rollers 7 and 9, which run at different speeds, and is transformed into a pre-batting web 10. The pre-batting web 10 is fed to the calendering unit 17. The calendering unit 17 transforms the pre-batting web 10 into the batting web 18. The calendering unit 17 is represented by a pair of calendering rollers, which form a nip line 32 between them. On its way from the drafting system 6 to the calendering unit 17, the pre-batting web 10 travels a path A between the pair of output rollers 9 and an entry into the nip line 32 of the calendering unit 17. An element 33 is provided for trouble-free guidance of the pre-batting web 10 from the drafting system 6 to the nip line 32. The element 33 for guiding the pre-wadding web 10 can also be omitted if the drafting system 6 is arranged sufficiently close to the calendering system 17. Element 33 is shown as an example of a guide profile.

[0019] The illustration shows a belt winder as an example of a winding unit. The batting web 18 is then guided past the calendering unit 17 into the belt winder and wound onto a core 21 to form a batting roll 19 that is rotatably mounted about a stationary winding axis 20. The core 21 is driven by a revolving, endless belt 23, which forms a loop 26 between a deflection roller 24 and an opening roller 25, in which loop the core 21, or rather the batting roll 19, is received. In the present case, the batting roll 19 is driven counterclockwise in the direction of rotation 22 by the belt 23. The loop 26 of the belt 23 wrapping around the batting roll 19 increases as the batting roll 19 grows, with the belt 23 being tensioned by a tension roller 29 throughout the entire winding process. The belt 23 is further guided over an ejection roller 27 and a guide roller 28.

[0020] Figure 3shows a schematic representation of a second embodiment of the device according to the invention. The device comprises a first drafting system 6 and a second drafting system 11, a calendering system 17 and a winding unit, which are held in a common machine frame 30. The machine frame, in turn, stands on a foundation 31. Cans 1, which contain the fiber slivers 4 to be processed, are also mounted on the foundation 31. A creel 2 is provided above the cans 1. The fiber slivers 4 are conveyed from the cans 1 to the device via creel rollers 3 provided on the creel 2 and fed as a fiber sliver sheet 5 to the first drafting system 6 and as a further fiber sliver sheet 5 to the second drafting system 11. The first drafting system 6 has an input roller pair 7, a middle roller pair 8 and an output roller pair 9.The first drafting system 6, or rather the drafting system rollers 7, 8, and 9, which run at different speeds, subject the fiber sliver sheet 5 to drafting and transform it into a first pre-batting web 10. The second drafting system 11 has an input roller pair 12, a middle roller pair 13, and an output roller pair 14. The second drafting system 11, or rather the drafting system rollers 12, 13, and 14, which run at different speeds, subject the fiber sliver sheet 5 to drafting and transform it into a second pre-batting web 15.

[0021] The first pre-batting web 10 and the second pre-batting web 15 are placed on top of one another and fed to the calendering unit 17. The calendering unit 17 forms a batting web 18 from the pre-batting webs 10 and 15. The calendering unit 17 is represented by a pair of calendering rollers which form a nip line 32 between them. On its way from the first drafting unit 6 to the calendering unit 17, the first pre-batting web 10 travels a path A between the pair of output rollers 9 and an entry into the nip line 32 of the calendering unit 17. On its way from the second drafting unit 11 to the calendering unit 17, the second pre-batting web 15 travels a path B between the pair of output rollers 14 and an entry into the nip line 32 of the calendering unit 17. In a preferred embodiment, the paths A and B are of equal length.

[0022] An element 33 is provided for the smooth guidance of the pre-batting webs 10 and 15 from the drafting systems 6 and 11 to the clamping line 32. Element 33 is provided, for example, at the point where the first pre-batting web 10 and the second pre-batting web 15 join and is shown as a guide arranged on both sides of the pre-batting webs 10 and 15. Element 33 for guiding the pre-batting webs 10 and 15 can also be omitted if the drafting systems 6 and 11 are arranged sufficiently close to the calendering system 17.

[0023] The first drafting system 6 and the second drafting system 11 are arranged at an inclination relative to one another. The first drafting system 6 is arranged with a positive inclination α relative to an axis of symmetry 34, and the second drafting system 11 is arranged with a negative inclination β relative to the axis of symmetry 34. The axis of symmetry 34 is to be understood as the line which lies between the drafting systems 6 and 11 and which has the same distance from the respective drafting system roller pairs 7 to 9 and 12 to 14 of the two drafting systems 6 and 11 when the angles of inclination α and β are equal. In the arrangement of the drafting systems 6 and 11 shown, the axis of symmetry 34 corresponds to a horizontal line.

[0024] The illustration shows a belt winder as an example of a winding unit. The batting web 18 is then guided past the calendering unit 17 into the belt winder and wound onto a core 21 to form a batting roll 19 that is rotatably mounted about a stationary winding axis 20. The core 21 is driven by a revolving, endless belt 23, which forms a loop 26 between a deflection roller 24 and an opening roller 25, in which loop the core 21, or rather the batting roll 19, is received. In the present case, the batting roll 19 is driven counterclockwise in the direction of rotation 22 by the belt 23. The loop 26 of the belt 23 wrapping around the batting roll 19 increases as the batting roll 19 grows, with the belt 23 being tensioned by a tension roller 29 throughout the entire winding process. The belt 23 is further guided over an ejection roller 27 and a guide roller 28.

[0025] Figure 4shows a schematic representation of a third embodiment of the device according to the invention. The device comprises a first drafting system 6 and a second drafting system 11, a calendering system 17, and a winding unit. A fiber sliver sheet 5 is fed to the first drafting system 6, and another fiber sliver sheet 5 is fed to the second drafting system 11. The first drafting system 6 has an input roller pair 7 and an output roller pair 9. The fiber sliver sheet 5 is drafted by the first drafting system 6, or rather the drafting system rollers 7 and 9 running at different speeds, and is transformed into a first pre-batting web 10. The second drafting system 11 has an input roller pair 12 and an output roller pair 14. By means of the second drafting device 11, or the drafting device rollers 12 and 14 running at different speeds, the fiber sliver sheet 5 is subjected to drafting and is transformed into a second pre-batting web 15.

[0026] The first pre-batting web 10 and the second pre-batting web 15 are guided out of the drafting systems 6 and 11 in the running direction 16 and placed on top of one another in the region of an element 33 for guiding the pre-batting webs 10 and 15 and then fed to the calendering system 17. The calendering system 17 forms a batting web 18 from the pre-batting webs 10 and 15. The calendering system 17 is represented by a pair of calendering rollers which form a nip line 32 between them. On its way from the first drafting system 6 to the calendering system 17, the first pre-batting web 10 travels a path A between the pair of output rollers 9 and an entry into the nip line 32 of the calendering system 17. On its way from the second drafting system 11 to the calendering unit 17, the second pre-batting web 15 travels a path B between the output roller pair 14 and an entry into the nip line 32 of the calendering unit 17. In a preferred embodiment, the paths A and B are of equal length.

[0027] The first drafting system 6 and the second drafting system 11 are arranged inclined relative to one another. The first drafting system 6 is arranged with a positive inclination α relative to an axis of symmetry 34 and the second drafting system 11 is arranged with a negative inclination β relative to the axis of symmetry 34. The axis of symmetry 34 is to be understood as the line which is located between the drafting systems 6 and 11 and which has the same distance to the respective drafting roller pairs 7 and 9 as well as 12 and 14 of the two drafting systems 6 and 11 when the angles of inclination α and β are equal. In the arrangement of the drafting systems 6 and 11 shown, the axis of symmetry 34 is arranged obliquely relative to a horizontal line. The arrangement of the axis of symmetry 34 is determined by the position of an inlet into the calendering system 17. Compared to the arrangement in Figure 3, in which a direct inlet of the pre-cotton webs 10 and 15 into the clamping line 32 is provided, is in an arrangement according to Figure 4 An indirect infeed of the pre-cotton webs 10 and 15 into the clamping line 32 is provided. The pre-cotton webs 10 and 15 are introduced into the clamping line 32 via the surface of one of the calender rolls. In the embodiment shown, the travel paths of the pre-cotton webs 10 and 11 between the respective output roll pairs 9 and 14 and the element 33 for guiding or joining the pre-cotton webs 10 and 15 are also of equal length.

[0028] The illustration shows a roller winder as an example of a winding unit. After calendering 17, the batting web 18 is transferred to a first winding roller 35. From the first winding roller 35, the batting web 18 reaches a core 21 and is wound up thereon. The winding process is supported by the second winding roller 36; the two winding rollers 35 and 36 rotate in parallel and drive the core 21 and the resulting batting roll 19 in the direction of rotation 22. The core 21 rotates about a winding axis 20. The core 21 is held together with the winding axis 20 in a shield 37; the bearing of the winding axis 20 is arranged displaceably in the shield 37, so that the core 21 moves further and further away from the winding rollers 35 and 36 as the batting roll 19 grows larger.

[0029] The present invention is not limited to the illustrated and described embodiments. Modifications within the scope of the claims are also possible. List of reference symbols

[0030] 1Can 2Cream 3Cream roller 4Sliver 5Sliver sheet 6First drafting system 7Input roller pair 8Middle roller pair 9Output roller pair 10First pre-batting web 11Second drafting system 12Input roller pair 13Middle roller pair 14Output roller pair 15Second pre-batting web 16Running direction of pre-batting web 17Calendaring 18Batting web 19Batting roll 20Winding axis 21Core 22Rotation direction of batting roll 23Belt 24Deflection roller 25Opening roller 26Loop 27Ejection roller 28Guide roller 29Tension roller 30Machine frame 31Foundation 32Clamping line 33Guide 34Symmetry axis 35First winding roller 36Second Winding roller 37Sign ALoad of first pre-batting web BLoad of second pre-batting web αIncline angle of first drafting system βIncline angle of second drafting system

Claims

1. Device for manufacturing a batting roll (19) from a plurality of fiber slivers (4), having a machine frame (30), at least one drawing frame (6), a calendering process (17), and a winding assembly, wherein the at least one drawing frame (6) is designed to draw the fiber slivers (4) and form a pre-batting web (10) and has a pair of input rollers (7) and a pair of output rollers (9), and wherein the calendering process (17) is arranged downstream of the at least one drawing frame (6) in order to form the batting web (18), characterized in that the at least one drawing frame (6) and the calendering process (17) and the winding assembly are held in the machine frame (30), and in that a travel path (A), provided for the pre-batting web (10), between the pair of output rollers (9) of the at least one drawing frame (6) and an entry into a clamping line (32) formed in the calendering process (17) is 200 mm to 500 mm.

2. Device according to claim 1, characterized in that the drawing frame (6) has at least pair of center rollers (8) between the pair of input rollers (7) and the pair of output rollers (9).

3. Device according to claim 1 or 2, characterized in that two drawing frames (6, 11) are provided.

4. Device according to claim 3, characterized in that the drawing frames (6, 11) are arranged inclined in opposite directions.

5. Device according to claim 3 or 4, characterized in that a travel path (B), provided for a second pre-batting web (15), between a pair of output rollers (14) of the second drawing frame (11) and an entry into a clamping line (32) formed in the calendering process (17) is 200 mm to 500 mm.

6. Device according to claim 5, characterized in that the travel path (A), provided for the first pre-batting web (10), between the pair of output rollers (9) of the first drawing frame (6) and an entry into a clamping line (32) formed in the calendering process (17) and the travel path (B), provided for the second pre-batting web (15), between a pair of output rollers (14) of the second drawing (11) and an entry into a clamping line (32) formed in the calendering process (17) are the same.

7. Device according to at least one of claims 3 through 6, characterized in that the drawing frames (6, 11) are arranged one above the other, and a superposition of pre-batting webs () formed by the drawing frames () is provided upstream of the calendering process (17).

8. Device according to at least one of the preceding claims, characterized in that the calendering process (17) is provided by a single pair of calender rollers forming a clamping line (32).

9. Device according to at least one of the preceding claims, characterized in that an element (33) for guiding the pre-batting web (10, 15) is provided upstream of the clamping line (32).

10. Device according to claim 9, characterized in that a distance between the respective pair of discharge rollers (9, 14) of the drawing frames (6, 11) and the element (33) for guiding the pre-batting web (10, 15) is the same.

11. Device according to at least one of the preceding claims, characterized in that the winding assembly has a circumferential belt (23) for winding the batting web (18) onto a core (21), wherein, in the machine frame (30), at least five rollers (24, 25, 27, 28, 29) are rotatably mounted around which the belt (23) revolves.

12. Device according to at least one of claims 1 through 10, characterized in that the winding assembly has a first winding roll (35) and a second winding roll (36) for winding the batting web (18) onto a core (21), wherein the winding rolls (35, 36) are rotatably mounted in the machine frame (30).