Method for producing roving for ring spinning machine and device

Abstract

The present invention relates to a method for producing a roving (VG) for a ring spinning machine from at least one fiber strip (FB) drawn in a preceding drawing process carried out in a section (9), wherein the at least one drawn fiber strip (FB), after leaving the section (9), is introduced by means of a guide (3) into a downstream lay-up cylinder (2) rotatable about a vertical axis of rotation (a) or a downstream lay-up cylinder (2) rotatable about a vertical axis of rotation (a) and vertically movable along the axis of rotation (a), and is laid down in the lay-up cylinder (2) in the form of a roving (VG). The invention further relates to a device for producing a roving according to the described method and to a system for producing a roving.

Description

TECHNICAL AREA

[0001] The present invention is situated in the field of spinning preparation and deals with the production of roving for use as a template for a ring spinning machine, whereby a flyer spinning machine is dispensed with. TECHNOLOGICAL BACKGROUND

[0002] In a common configuration, a ring spinning machine, more precisely the ring spinning creel of the drawing unit of the ring spinning machine, is fed a roving. This roving is on a roving spool and is fed to the ring spinning machine from the flyer, where the roving is produced, via a conveyor system.

[0003] The fiber slivers coming from the carding mill and, if applicable, from the combing mill, are first doubled and simultaneously drawn using drafting machines, according to the state of the art, and then laid down in cans. The resulting draft sliver is then presented to the flyer for further processing. There, the draft sliver is drawn further and then slightly twisted by means of a corresponding twisting process – creating a so-called protective twist – and wound onto a roving spool as roving (also called fiber roving, flyer roving, or simply roving). The protective twist serves to strengthen the roving so that it does not unravel and can be wound onto the roving spool, transported to the ring spinning machine, and unwound again. In this way, defects (e.g., thin spots in the roving) can be avoided. On the other hand, the protective twist must be easily unwound.The roving must remain flexible to allow for the subsequent ring spinning process. A typical flyer output is 20-30 meters of roving per minute. Increasing productivity is either impossible or only possible to a limited extent, as higher speeds result in greater centrifugal forces that the flyer, especially the wings, and the feeder bobbin must withstand.

[0004] Attempts have already been made to bypass the roving machine in the form of a flyer to increase production, for example by introducing the section of the ring spinning machine, i.e., feeding the draft sliver directly from the drafting unit to the ring spinning machine to save costs and space. For instance, it is known to deposit fiber slivers with a fineness of approximately 5 ktex into cans after a first drafting unit, which is usually part of a drafting unit. These cans are then fed to the ring creel, where they are unwound and fed to a spinning station of a ring spinning machine. Since slight distortions can occur at the ring creel, fine slivers below 3.5 ktex were not used here. Because the distortion at the ring spinning machine is limited, only coarse ring yarns can be spun using this known method.The result is therefore unsatisfactory in terms of yarn quality, the complexity of the setup (direct feeding of drawing cans to the ring spinning machine), the difficult handling, and the aforementioned distortions. Furthermore, its use is limited to coarse ring yarns. For finer yarns, the current method involves inserting a flyer, which draws a fiber sliver with an example sliver weight of 5 k tex into a roving with a weight of 200–1200 tex and winds it onto a roving spool, which is then fed to a ring spinning machine.

[0005] One way to replace the flyer is shown in WO 2005 / 026420 A1. The invention relates to a drawing-pre-spinning machine combination in which several fiber slivers are first doubled and drawn in the same machine, and then a roving is produced from them. The roving is produced by imparting a twist (rotation) to the drawing sliver, the twist being imparted by means of one or more air streams. For this purpose, the device described in WO 2005 / 026420 A1 comprises a drawing unit and, downstream, one or more twist-imparting means.

[0006] The air currents, however, more or less negate the parallelization of the fibers achieved by the spinning process. Therefore, the quality of the resulting roving does not meet the requirements of modern spinning mills and is in need of improvement.

[0007] WO 2006 / 092176 A1 discloses another possibility for a flyerless spinning process, particularly for fine yarns. The invention described therein relates to a method for the direct spinning of fiber ribbon and a suitable device, wherein the protective twist is applied either by means of a pneumatically actuated compression nozzle or mechanically directly after the section.

[0008] The quality of the produced roving also proves to be disadvantageous or unsatisfactory here.

[0009] The present invention aims to minimize or eliminate the aforementioned disadvantages, particularly with regard to the quality of the produced roving. PRESENTATION OF THE INVENTION

[0010] The object of the present invention is in particular to propose a method for producing a roving for use on a ring spinning machine, which overcomes the disadvantages in terms of productivity and quality shown in the prior art.

[0011] The problem is solved according to the invention by a method for producing a roving for a ring spinning machine as well as a device and a system.

[0012] The essence of the invention lies in a method for producing a roving for a ring spinning machine from at least one fiber strip stretched in a preceding stretching process carried out in a line, wherein the at least one stretched fiber strip, after leaving the line to impart a true rotation, is introduced via a guide means into a downstream lay-up cylinder rotatable about an axis of rotation or a downstream lay-up cylinder rotatable about an axis of rotation and vertically movable along the axis of rotation and is laid down in the lay-up cylinder in the form of a roving.

[0013] A roving is a stretched fiber sliver, also called a roving, which is provided with a so-called protective twist (in this case, a true twist, as described below) and serves as a template for a ring spinning machine. The roving acts as a template for the actual ring spinning process. In the ring spinning machine, it is stretched many times further, depending on the desired yarn fineness. Rovises, for example, have a weight of 0.1–6 ktex. A roving also has a protective twist. As already mentioned, the protective twist strengthens the roving, allowing it to be wound onto a roving spool for the ring spinning machine (e.g., a roving bobbin) without falling off or coming loose, and to be transported on this spool to the ring spinning machine. Furthermore, a roving, compared to yarn (here: ring yarn), is susceptible to drafting. This drafting takes place in the drafting unit of the ring spinning machine.

[0014] Within the scope of the invention, the term "roving" is used as soon as the drawn fiber strip reaches the clamping point on the last pair of rollers before entering the guiding element – ​​be this the last pair of rollers of the drafting unit or drafting unit module, the drafting section, the calender roller, or a downstream conveying roller or deflecting roller. The actual rotation is imparted to the roving between said clamping point and the rotating lay-up cylinder, whereby the roving is pressed against the inner wall of the lay-up cylinder by centrifugal forces, and the rotation of the lay-up cylinder between the clamping point on the corresponding pair of rollers and the roving, which is held against the inner wall of the lay-up cylinder (rotatable about a vertical axis of rotation) by centrifugal forces, results in an actual rotation.This means that the roving is actually twisted between the two fixed points, namely the clamping point described above and the inner wall of the lay-up cylinder (the point where the centrifugal force presses the roving against the inner wall), by the rotation of the lay-up cylinder. The parallelism created during the drawing process is largely preserved.

[0015] When the invention refers to the inner wall of the lay-up cylinder, this does not necessarily mean the inner wall in the strictest sense. Rather, it also means that layers of roving may already be present on the inner wall, i.e., part of the roving cake has already been formed.

[0016] A drawing unit or module comprises several pairs of rollers – this does not preclude a four-over-three drawing unit – for drawing multiple, mixed fiber strips from the upstream processing unit, e.g., in the form of carded strips. The drawing unit can be a separate machine with multiple drawing sections, which is loaded with, for example, carded strips stored in cans, or it can be a drawing module directly downstream of the upstream processing unit, e.g., the carding machine. The drawing unit or module can, for example, be a regulated drawing unit that uses sensors to automatically regulate the draft between the individual pairs of rollers. It can also be unregulated. The drawing unit or module performs a drawing process and produces a drawn fiber strip – also called a stretched strip.

[0017] The drawing process itself serves to mix, draw, refine, and homogenize the roving fed from the pre-worker to the drawing unit or drawing module, and takes place in the drawing unit (e.g., regulating unit) or a drawing module. A drawn roving—also called a roving—is produced in the drawing unit or drawing module. The drawn roving has a weight of 1–6 ktex. While, according to the prior art, the drawn roving is deposited via a belt channel in a rotating platform within a spinning can, according to the invention, it is introduced into a depositing cylinder located downstream of the drawing unit or drawing module, which is rotatable about a vertical axis of rotation, or into a depositing cylinder located downstream of the drawing unit or drawing module, which is rotatable about a vertical axis of rotation and vertically movable along the axis of rotation—this is accomplished according to the invention via a guide. In this process, the roving is given a true twist.This occurs directly after the stretched fiber tape leaves the track or track module, i.e., the stretched fiber tape is not transported to another machine, e.g., the flyer, thus shortening the process.

[0018] A stretched fiber ribbon is a fiber ribbon that is output from a stretching unit or stretching module and thus represents the product of a stretching process preceding the spinning process.

[0019] In the context of the invention, a true twist is a twist that is generated mechanically—as opposed to pneumatically—and in which the parallelization of the fibers achieved through the drawing process is not destroyed, as is the case when using, for example, an air nozzle that separates and swirls the fibers. Maintaining the parallelization achieved in the drawing process has a positive effect on the quality of the roving, which also makes it suitable for the production of fine ring yarn.As mentioned above, the true twist is imparted to the roving between the clamping point and the rotating lay-up cylinder. Centrifugal forces deposit the roving against the inner wall of the lay-up cylinder, and centrifugal forces then cause the rotation of the lay-up cylinder between the clamping point on the corresponding pair of rollers and the roving held against the inner wall of the lay-up cylinder (which rotates about a vertical axis). In other words, the roving is twisted between two fixed points: the clamping point of the last pair of rollers to be passed and the point on the inner wall of the lay-up cylinder where the roving adheres due to centrifugal force.

[0020] The departure from the track to initiate a true rotation takes place here - that is, when the stretched fiber strip passes the clamping point of the last pair of rollers before entering the guide.

[0021] The guide leads the roving, after it has left the track (i.e., passed the last possible clamping point in the track / track section or the drawing module), into the lay-up cylinder, which rotates around a vertical axis or is rotatable around a vertical axis and movable vertically along that axis. The guide does not clamp the roving; it does not provide a fixed point for imparting rotation. Instead, it allows the roving to move freely, enabling the actual rotation to propagate towards the clamping point. In the operating position, the guide and / or the lay-up cylinder, which is rotatable around a vertical axis, perform a vertical relative movement along that axis. Depending on the design, the guide may be rotatable around an axis. This axis does not necessarily have to coincide with the axis of rotation of the lay-up cylinder.

[0022] The position of the guide element within the layup cylinder at a specific point in the process defines the height at which the roving is laid up within the layup cylinder. If the layup cylinder also moves vertically, this movement must be taken into account when determining the layup height. Depending on the embodiment, this vertical relative movement is achieved either by the layup cylinder shifting vertically along the axis of rotation, or by the guide element, which is arranged coaxially, shifting vertically along the axis of rotation, or by both moving vertically. Layup occurs, for example, layer by layer from the outside in—that is, from an inner wall of the rotating layup cylinder, or possibly of the inner cylinder, towards the vertical axis of rotation of the rotating layup cylinder.The lay-up can occur from top to bottom, i.e., along the yarn path, or from bottom to top, i.e., against the yarn path along the vertical axis of rotation. The vertical relative movement between the guide and the lay-up cylinder depends on the speed of the yarn feed, the rotational speed of the lay-up cylinder, the desired fineness or weight of the yarn, and finally, the chosen presentation for feeding onto a ring spinning machine or the required structure of the yarn cake.

[0023] The storage cylinder is hollow, allowing the guide element to project coaxially into it. The storage cylinder may have a textured or coated inner wall.

[0024] In its operating position, the lay-up cylinder rotates around its vertical axis at speeds between 2,000 and 20,000 rpm. The lay-up cylinder can be at least partially closed at both the top (the inlet opening into which the guide protrudes or into which the roving is inserted) and the bottom (the opening opposite the inlet opening).

[0025] The diameter of the storage cylinder measures 150 mm and between 150 and 500 mm. The length of the storage cylinder is 350 mm and between 350 and 700 mm.

[0026] Both the delivery cylinder, which rotates around a vertical axis of rotation, or the delivery cylinder, which is rotatable around a vertical axis of rotation and vertically displaceable along that axis, and the guide element have means for mounting either on a housing downstream of the conveyor or on the conveyor or conveyor module itself. Furthermore, drives and at least one control unit are provided, which control the rotational speed of the delivery cylinder as well as the vertical movement of the delivery cylinder, or, depending on the embodiment of the guide element, the vertical movement of the guide element. Sensors for determining the delivery speed of the upstream conveyor or conveyor module, as well as sensors for, e.g., the current (fill) level of the delivery cylinder or the weight of the roving cake, are optionally provided.

[0027] According to the invention, the device for producing a roving, which comprises a guide means for the roving and a lay-up cylinder rotatable about a vertical axis of rotation or a lay-up cylinder rotatable about a vertical axis of rotation and vertically movable along the axis of rotation, is supplied with the stretched fiber strip after leaving the path, where it undergoes a true rotation in the sense of the invention and is laid down as roving on the inner wall of the lay-up cylinder.

[0028] Advantageously, the guide element is movable vertically along the axis of rotation and protrudes at least partially into the depositing cylinder during the process.

[0029] Firstly, this ensures that the roving reaches the rotating layup cylinder and is not delivered into empty space – i.e., not into the layup cylinder – due to turbulence caused by the high rotational speed of the layup cylinder. Secondly, the guide element extending into the layup cylinder determines the relative height of the layup within the cylinder's interior / inner wall. If the guide element does not extend into the layup cylinder, the roving will be delivered into empty space, especially if the process is restarted after the initial "opening".

[0030] If the guide element is vertically movable along the axis of rotation, it is sufficient for the delivery cylinder to rotate around the vertical axis of rotation, thus creating a relative movement. This does not preclude both the delivery cylinder and the guide element from exhibiting vertical movements along the axis of rotation during the process. The guide element is aligned coaxially with the delivery cylinder.

[0031] The relative movement between the guide means and the depositing cylinder enables the formation of a roving cake in the depositing cylinder or alternatively in a removable inner cylinder arranged in the depositing cylinder.

[0032] During the process, this means during the formation of the roving cake, i.e., in operating position.

[0033] Advantageously, leaving the track includes passing calender rolls, in particular a clamping point of the calender rolls, or passing the conveyor rolls downstream of the calender rolls, in particular a clamping point of the conveyor rolls.

[0034] Calender rolls are designed in pairs and form a clamping point between them – as do any conveyor rolls or deflection rolls that may be present. Measuring rolls, e.g., RQM measuring rolls, can also be used instead of calender rolls. As long as these also have a clamping point and thus contribute to achieving a true rotation, they are to be considered equivalent to a pair of calender rolls or a pair of conveyor rolls within the scope of the invention.

[0035] A conveying roller can serve to redirect the conveying direction – for example, if the device according to the invention is not arranged axially below the fleece nozzle or the clamping point of the calender rollers, but is, for example, laterally displaced. These are also referred to as deflection rollers.

[0036] If exiting the drawing board or drawing module involves passing a pair of calender rolls, this offers the advantage that no structural modifications to the drawing board or drawing module are necessary. Only a device according to the invention needs to be installed downstream. Alternatively, exiting the drawing board can involve passing a clamping point of an exit-side pair of rolls of the drawing board or drawing module, with a nonwoven die subsequently arranged, depending on the design. The nonwoven die does not create a clamping point and therefore does not contribute to imparting a true twist in the roving.

[0037] Furthermore, leaving the line can involve passing through a belt accumulator. The belt accumulator offers the advantage that if the discharge cylinder is full and needs to be replaced or emptied, or if other interruptions occur in the roving formation / actual twisting, the upstream drawing process does not have to be stopped immediately, but can continuously supply drawn fiber strip. The arrangement of the belt accumulator varies – it can be positioned before the calender roll pair. If a feeder roll pair is also provided, the belt accumulator can be positioned between the calender roll and the feeder roll. The belt accumulator can be positioned after the feeder roll – however, in this case, another roll pair or similar component with a clamping point is necessary to achieve actual twisting. The belt accumulator can assist with any necessary deflection. Furthermore, the belt accumulator can be designed as a storage loop.

[0038] The method advantageously involves the imparting of true rotation between the clamping point of the calender rolls or the clamping point of the conveyor rolls and the roving, which is deposited against an inner wall of the rotatable lay-up cylinder by means of centrifugal forces. The lay-up cylinder can be either rotatable about a vertical axis or rotatable about a vertical axis and movable vertically along that axis. This represents an efficient and easily implemented method for imparting protective rotation at high speeds without loss of quality. Productivity can also be increased by this method due to the high rotational speed of the lay-up cylinder.

[0039] Advantageously, the twist factor αe of the true twist lies between 0.3 and 2.0. This means that the roving is given a true twist, resulting in a twist factor between 0.3 and 2.0. It is therefore not a spun yarn, but a roving with a protective twist. The twist factor αe is derived from the following relationship: Twist per inch corresponds to the twist factor αe multiplied by the square root of the yarn count (Ne), which, when solved for the twist factor αe, yields the following: Twist factor αe is the twist per inch divided by the square root of the roving count in Ne, or, converted to the numerical system, twist per meter divided by the square root of the roving count in Nm.

[0040] It is advantageous if a multi-layered roving cake is formed on the inner wall of the rotatable lay-up cylinder, which together with the lay-up cylinder forms a presentation for presentation on a ring spinning machine, or which can be formed into a presentation for presentation on a ring spinning machine.

[0041] The lay-up cylinder is a lay-up cylinder rotatable about a vertical axis of rotation or rotatable about a vertical axis of rotation and vertically movable along the axis of rotation. This aspect of the invention offers the advantage that a flyer can be completely dispensed with, which significantly increases efficiency in yarn production. An advantageous further development of the invention provides that a removable inner cylinder is located in the lay-up cylinder, on the inner wall of which the roving cake is formed. The term "presentation for feeding to a ring spinning machine" refers to the form of the roving, here the roving cake, in which it is fed to the ring spinning machine, more precisely to the creel of the ring spinning machine. This is often a roving spool, although other presentations are also conceivable, such as the lay-up cylinder filled with the roving cake or an inner cylinder filled with the roving cake.

[0042] Furthermore, the first layer is advantageously deposited on the inner wall of the depositing cylinder by the combined action of the cylinder's rotation and a vertical relative movement between the guide and the rotating cylinder. The rotation of the depositing cylinder and the vertical relative movement between the cylinder and the guide must be coordinated. This first layer gives the roving cake its stability and transportability, and it provides support for the subsequent layers.

[0043] To ensure continued transportability, it is advantageous if each subsequent layer following the first is placed offset from the first layer, and each subsequent layer is placed offset from the corresponding preceding layer.

[0044] According to one embodiment of the invention, the roving cake is rewound or laid down into the shape of a presentation. Depending on the roving quality, this allows for the provision of a transportable presentation. Depending on the presentation requirements, rewinding, laying down, or turning the roving cake down is more advantageous than using the presentation cylinder lined with the roving cake or, alternatively, an inner cylinder lined with the roving cake and removable from the presentation cylinder for feeding into the ring spinning machine.

[0045] The essence of the invention lies in a device for producing roving for a ring spinning machine according to the embodiments of the inventive method described above. The device comprises at least one lay-up cylinder that can be arranged along a line and rotated about a vertical axis of rotation, or one that can be arranged along a line and rotated about a vertical axis of rotation and moved vertically along the axis of rotation, and a guide means, wherein the lay-up cylinder and the guide means are substantially coaxially aligned.

[0046] The coaxial alignment of the depositing cylinder and the guide is advantageous because the rotation of the depositing cylinder exerts a centrifugal force on the roving. With coaxial alignment, this force acts uniformly on the roving, enabling the formation of a uniform roving cake. A vertical relative movement occurs between the guide and the depositing cylinder. Either the depositing cylinder, which rotates around a vertical axis, is movable vertically along this axis, while the guide is fixed in this position, or, as described later, the guide is movable vertically along the axis of rotation. Depending on the delivery speed, both the guide and the depositing cylinder can be designed to be vertically movable, allowing for the deposit of a uniform roving cake within the depositing cylinder.Furthermore, the described relative movement between the lay-up cylinder and the guide means can reduce, regulate, and control tensions in the roving, which depend, among other things, on the radius (here: exit of guide tube to inner wall of lay-up cylinder or position of roving cake) and the rotational speed of the lay-up cylinder.

[0047] Both the discharge cylinder and the guide can be pivotally mounted on the track or track module. This allows for the "opening" of a discharge cylinder filled with roving as well as the correction of any errors during the process.

[0048] Advantageously, the guide protrudes into the lay-up cylinder in the operating position. During the process, the operating position refers to the time when the roving cake is being formed. In this position, the lay-up cylinder rotates around a vertical axis at a predetermined speed, generating a specific relative motion between the lay-up cylinder and the guide. This motion deposits the roving layer by layer within the lay-up cylinder, specifically against its inner wall. The fact that the guide protrudes at least partially into the lay-up cylinder offers the advantage that the roving adheres to the inner wall of the cylinder due to the centrifugal force generated in the operating position, preventing it from being displaced into the air.

[0049] According to an advantageous embodiment, the guiding element is a guide tube or at least one guide eyelet. Neither a guide tube nor at least one guide eyelet disturbs the alignment of the fibers; on the contrary, they support the fiber position. If the guiding element is designed in the form of at least one guide eyelet, a possible embodiment is that the guiding element consists of two guide eyelets, namely an upper and a lower one, the lower of which can be movably designed. Both eyelets, e.g., horizontally oriented, can be connected to each other via a vertical connecting tube, with the lower eyelet being movably connected to it. An advantage of this embodiment is that starting up (resuming the process) would be facilitated, since, among other things, the fiber tape or roving can be more easily inserted into the upper eyelet when the lower one is opened.

[0050] According to an advantageous embodiment of the invention, the at least one rotatable lay-up cylinder comprises a removable inner cylinder. Layer by layer of the roving cakes is formed in the inner cylinder during the process. The inner cylinder can be removed from the lay-up cylinder and attached to it.

[0051] It is particularly advantageous if the inner cylinder lined with roving serves as a template for presentation on a ring spinning machine. This allows the roving to be directly processed into yarn on the ring spinning machine and significantly increases the efficiency of the yarn production process, as a process step such as the flyer can be omitted.

[0052] The invention further provides a system for producing roving for a ring spinning machine according to the inventive method described above and its alternatives. The system comprises a section extending a fiber strip and a downstream lay-up cylinder that rotates about a vertical axis of rotation or is rotatable about a vertical axis of rotation and vertically movable along the axis of rotation. The roving is introduced into the lay-up cylinder by means of a guide to impart a true rotation. The system also includes a control device. The guide is an integral part of the system and can be configured as already described. The lay-up cylinder is also configured as already described. In the operating position, the lay-up cylinder and the guide interact as described above, namely through the rotation of the lay-up cylinder and a vertical relative movement between the lay-up cylinder and the guide.The rotational movement and the vertical relative movement are coordinated by means of a control device. Additionally, the system can include one or more nonwoven nozzles, calender roller pairs, conveyor roller pairs, and one or more belt accumulators, as well as means for mounting the discharge cylinder and the guide element on the track.

[0053] It is particularly advantageous if the drafting unit (here, the final drafting section) or drafting module used in the system has a so-called 3D nonwoven die. Such a nonwoven die is shown in WO 2004 / 104278 A1. It is a nonwoven guide device for a textile machine with a drafting unit, which serves to compact a nonwoven fabric exiting the drafting unit in a spread-out form. The device has an inlet section and a downstream outlet section, which has a narrower cross-section compared to the inlet section. The nonwoven guide device is characterized by at least one guide surface arranged between the inlet section and the outlet section, which is designed such that the fibers inner in the transverse direction of the nonwoven are guided less directly to the outlet section than the outer fibers. A nonwoven die designed in this way is also called a 3D nonwoven die.All embodiments shown in WO 2004 / 104278 A1 are possible for carrying out the invention and are hereby deemed to be disclosed in connection with the invention.

[0054] A 3D nonwoven nozzle ensures that the outer fibers of the fiber sliver are not subjected to greater stress than the fibers in the middle, thus ensuring a more homogeneous distortion result in the stretched fiber sliver, leading to a higher quality roving and consequently spun yarn. BRIEF EXPLANATIONS OF THE FIGURES

[0055] The invention is further described in the following exemplary embodiments. These show, schematically: Figure 1: Advantageous embodiment of a device for carrying out the method according to the invention. Figure 2: Advantageous embodiment of a presentation for use on a ring spinning machine.

[0056] Fig. 1 Figure 1 schematically shows an embodiment of a device 1 for carrying out the inventive method for presentation on a ring spinning machine. The device 1 comprises a lay-up cylinder 2 rotatable about a rotational axis a and a guide means 3, here a guide tube, which is vertically displaceable along the rotational axis a. As mentioned, alternatively the lay-up cylinder 2 can be movable vertically along the rotational axis a instead of the guide means 3, or both can be movable vertically along the rotational axis a. Control and coordination are achieved by the control unit 10.

[0057] The device includes a drafting unit / drafting module 9, which drafts the fiber ribbon and feeds it through a nonwoven die 7, specifically a 3D nonwoven die, to a pair of calender rolls 8. After leaving the drafting unit, specifically after passing the clamping point of the calender rolls 8, the roving is referred to as VG. The actual rotation occurs between the clamping point of the calender rolls 8 / the calender roll pair and the VG, which is pressed against the inner wall 2.1 of the lay-up cylinder 2 by the rotation of the lay-up cylinder 2, which is rotatable about an axis of rotation a. The roving VG is fed via a guide tube 3 into the lay-up cylinder 2, which rotates during the process, and is laid down layer by layer on its inner wall 2.1, thus forming a roving cake 4. The lay-up cylinder 2, provided / filled with the roving cake 4, serves as a presentation 5 for a ring spinning machine 6.To prevent the roving cake from detaching from the lay-up cylinder due to gravity, means for fixing the roving cake in the lay-up cylinder (or, if applicable, in the inner cylinder as described above) are provided, depending on the embodiment.

[0058] Fig. 2 Figure 1 schematically shows a spinning station of a ring spinning machine 6 with a feeder 5 for the ring spinning machine 6. Depending on the embodiment, the feeder does not differ from known feeders and is achieved by rewinding, laying down, or tipping the roving cake onto a roving bobbin. The feed to the respective spinning station of the ring spinning machine is carried out according to the prior art.

Claims

1. Method for producing a roving (VG) for a ring spinning machine from at least one fiber strip (FB) stretched in a preceding stretching process carried out in a section (9), wherein the at least one stretched fiber strip (FB) is introduced after leaving the section (9) via a guide means (3) into a downstream lay-up cylinder (2) rotatable about a vertical axis of rotation (a) or a downstream lay-up cylinder (2) rotatable about a vertical axis of rotation (a) and vertically movable along the axis of rotation (a) and is laid down in the lay-up cylinder (2) in the form of a roving (VG).

2. Method according to claim 1, wherein the guide means (3) is movable vertically along the axis of rotation (a) and projects at least partially into the storage cylinder (2) during the method.

3. Method according to one of the preceding claims, wherein leaving the path (9) comprises passing calender rolls (8), in particular a clamping point of the calender rolls (8), or passing conveyor rolls downstream of the calender roll (8), in particular a clamping point of the conveyor rolls.

4. Method according to claim 3, wherein leaving the track (9) additionally includes passing through a tape storage area.

5. Method according to one of claims 3 or 4, wherein the imposition of the actual rotation takes place between the clamping point of the calender rolls (8) or the clamping point of the conveyor rolls and the roving (VG) deposited by means of centrifugal forces on an inner wall (2.1) of the rotatable depositing cylinder (2).

6. Method according to one of the preceding claims, wherein a rotation factor α e the actual rotation lies between 0.3 and 2.

0.

7. Method according to one of the preceding claims, wherein a multi-layered roving cake is formed on the inner wall (2.1) of the rotatable lay-up cylinder, which together with the lay-up cylinder forms a presentation for presentation on a ring spinning machine or which can be formed into a presentation for presentation on a ring spinning machine.

8. Method according to claim 7, wherein the deposit in a first position in an inner wall (2.1) of the deposit cylinder (2) is effected by the interaction of the rotation of the deposit cylinder (2) and a vertical relative movement between the guide means (3) and the deposit cylinder (2).

9. Method according to claim 8, wherein a further layer following the first layer is placed offset on the first layer and each subsequent layer is placed offset on the correspondingly preceding layer.

10. Method according to claim 7, wherein the roving cake is rewound or turned out into the shape of a presentation (5).

11. Device for producing a roving (VG) for a ring spinning machine according to a method according to one of the preceding claims, comprising at least one lay-up cylinder arrangable to follow a line (9), rotatable about a vertical axis of rotation (a) or rotatable about a vertical axis of rotation (a) and movable vertically along the axis of rotation (a), and a guide means (3), wherein the lay-up cylinder (2) rotatable about an axis of rotation (a) and the guide means (3) are substantially coaxially aligned.

12. Device according to claim 11, wherein the guide means (3) projects into the storage cylinder (2) in the operating position.

13. Device according to one of claims 11 or 12, wherein the guide means (3) is a guide tube or at least a guide eyelet.

14. Device according to one of claims 11 - 13, wherein the at least one storage cylinder (2) comprises a removable inner cylinder.

15. Device according to claim 14, wherein the inner cylinder lined with roving (VG) represents a presentation (5) for presentation to a ring spinning machine (6).

16. System for producing a roving (VG) for a ring spinning machine according to a method according to one of claims 1 to 10, comprising a section (9) extending a fiber ribbon (FB), a device according to one of claims 11 - 15 and a control device (10).

17. System for producing a roving (VG) according to claim 16, wherein the section extending a fiber ribbon (FB) comprises a 3D nonwoven nozzle (7).

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