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EP-4474538-B1 - DRAFTING DEVICE, SPINNING STATION AND METHOD

EP4474538B1EP 4474538 B1EP4474538 B1EP 4474538B1EP-4474538-B1

Inventors

  • MEISSNER, Sarah
  • SCHIFFERS, DIRK
  • Seshayer, Chandrassekaran

Dates

Publication Date
20260513
Application Date
20240605

Claims (10)

  1. A spinning station comprising - at least one spinning nozzle (40), in particular an air-jet spinning nozzle; - at least one yarn end preparation device; - at least one yarn take-off; and - a drafting arrangement (101) comprising a plurality of roller pairs drivable differently from one another, which are configured and arranged to guide a sliver (31) between a respective top roller and a bottom roller of the respective roller pairs in their rotational operation, in order to draft the sliver (31); wherein the drafting arrangement (101) is configured and arranged to carry out a piecing process (100) after a separation of the sliver (31) in the drafting arrangement (101), in which at least two roller pairs are connected in a defined manner via their drive, wherein the spinning nozzle (40) and the yarn end preparation device are arranged and configured to initiate a piecing operation; wherein the yarn take-off is arranged and configured to take off a yarn from the spinning nozzle after a spinning process; wherein at least one drivable roller pair of the drafting arrangement (101) is coordinately connected via the drive of the roller pair for separating the sliver (31), characterised in that the yarn take-off is configured and arranged to be coordinately connected to the at least one roller pair for piecing or for spinning, wherein a run-up profile of the at least one roller pair comprises a piecing ramp (710, 720, 730) with at least two support points (725, 735, 745), wherein the support point (725, 735, 745) means a definition of a variable speed which is to be reached after a variable time, wherein the spinning nozzle (40) is configured and arranged to assume at least one operating position and a cleaning position different therefrom; and - the yarn end preparation device is configured and arranged to open up at least a yarn end by means of a supply of compressed air.
  2. The spinning station according to claim 1, characterised in that the at least two roller pairs for a defined connection are selected from the list of the following roller pairs: - input roller pair, - middle roller pair and/or - apron roller pair.
  3. The spinning station according to one of claims 1 or 2, characterised in that the spinning nozzle (40), in particular an air-jet spinning nozzle, is configured and arranged to assume at least one cleaning position.
  4. The spinning station according to any one of the preceding claims, characterised in that the drafting arrangement (101) is configured and arranged to separate the sliver (31) by the coordinated connection of at least two roller pairs.
  5. The spinning station according to any one of the preceding claims, characterised in that the drafting arrangement (101) is configured and arranged to coordinate the separation of the sliver (31) with a transfer of the spinning nozzle (40) into a cleaning position.
  6. The spinning station according to any one of the preceding claims, characterised in that the drafting arrangement (101) is configured and arranged to maintain a defined temperature of the drive of one of the roller pairs and/or of a rubber coating of the rollers of one of the roller pairs, in particular while the spinning station is inactive.
  7. A method (100) comprising the steps of: - separating a sliver by coordinately connecting at least one roller pair, in particular at least two roller pairs, of a drafting arrangement (101) of a spinning station according to any one of claims 1 to 6; - piecing by coordinately connecting at least two roller pairs of the drafting arrangement (101); and - piecing by coordinately connecting at least one yarn take-off of the spinning station to return the yarn end into the spinning nozzle; - spinning a yarn, in particular after successful piecing, comprising a coordinated connection of the yarn take-off and at least one roller pair of the drafting arrangement (101).
  8. A control device configured and arranged to carry out a method (100) according to claim 7.
  9. A textile machine comprising - a spinning station according to any one of claims 1 to 6; and - a control device according to claim 8; and wherein the textile machine is configured and arranged to carry out a method (100) according to claim 7.
  10. A computer program product configured to carry out a method (100) according to claim 7 when it is executed on a control device according to claim 8 of a textile machine according to claim 9.

Description

The invention relates to a spinning station with a drawing device. The invention relates to a method. The invention relates to a control device. The invention relates to a textile machine. The invention relates to a computer program product. Drafting devices are known in the art. They are used particularly in textile machines, and especially in air-jet spinning machines for air spinning. In air spinning, a fiber sliver, also called a drafting sliver, is drawn according to the desired yarn fineness by means of a drafting device, in particular a 4-roll drafting device, and fed to a spinneret. The spinneret is, in particular, a functional component of a spinning station. Within the spinneret, a portion of the fed fibers can be wound around the parallel fiber core by means of a rotary flow. This creates, in particular, the air-jet yarn-specific yarn structure of a yarn core consisting of parallel fibers and wrapping fibers lying at a specific angle to the yarn core, which contribute to the yarn's strength. If individual rollers of the drafting unit are idle for an extended period, the fiber sliver can become compressed over time. Similarly, frequent shutdowns of the textile machine and/or the drafting unit can make the fiber sliver a potential source of defects in the air-jet spinning process. In the event of a thread break, thread cut, or fiber sliver break, re-spinning may be necessary to resume spinning. However, compression of the fiber sliver can hinder re-spinning and lead to a weak point in the resulting yarn. In the prior art, spinning stations are known that can be used for both spinning and joining threads. In this process, a thread end, for example after a thread break, is prepared for joining so that fibers can be reattached to the thread to allow further spinning. This makes it possible to continue a spinning process, for example after a thread break has occurred. In air-jet spinning machines, according to one embodiment, joining is based in particular on bringing a broken thread end together with newly arriving fibers from the fiber spool in the vortex chamber of the air-jet spinning nozzle. The timing of the thread end return and the speeds of the The drawing machine and its timing are important for spinning a yarn. Incorrect timing during spinning can lead to unevenness in the yarn, which can negatively affect yarn quality. EP 1 072 702 A2 discloses a spinning site according to the preamble of claim 1. Further spinning stations according to the state of the art are also made of US 5 809 764 A known. The purpose of the invention is therefore to improve a spinning process, in particular a spinning process, to make the resulting thread more uniform and thus to reduce resources for a spinning process. The problem is solved by a spinning unit having the features of claim 1. Furthermore, the problem is solved by a method having the features of claim 7. The problem is solved by a control device having the features of claim 8. The problem is further solved by a textile machine having the features of claim 9. The problem is solved by a computer program product having the features of claim 10. Advantageous embodiments of the invention are the subject of the dependent claims. This can be a drafting device for a textile machine. The textile machine can be, in particular, an air-jet spinning machine. The drafting device can have several pairs of rollers that can be driven independently of each other. The roller pairs can be designed and arranged to guide a fiber ribbon between an upper and a lower roller of each pair during operation, in order to stretch the fiber ribbon. The drafting device can be designed and configured to carry out a spinning process after the fiber ribbon has been cut within the drafting device. The drafting device can be designed and configured to selectively add at least two pairs of rollers via their drives during the spinning process. This allows the roller pairs to be controlled in a specific manner and operated in different modes. Different operating modes can differ by at least one parameter, as described elsewhere. In particular, the rollers can have different speeds and/or different accelerations. This makes it possible, for example, to... It is possible to accelerate from a complete stop (i.e., from a standstill) to an operating state (linearly) during the spinning process. This also eliminates the need to warm up the rollers from a standstill. Instead, the rollers can be kept warm. This improves spinning, especially the initial spinning, and results in a more uniform yarn, thereby reducing the resources required for the spinning process. A drafting device can also include a drafting unit and/or be designated as such. Such a drafting unit can, in particular, comprise a number of roller pairs. These can, in particular, each have at least one active roller, which can be designated as the active roller or the drive roller. The drive roller can preferably be a single driven rolle