EP3533739B1 - Method for operating a textile machine and textile machine - Google Patents

Method for operating a textile machine and textile machine Download PDF

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Publication number
EP3533739B1
EP3533739B1 EP19154516.9A EP19154516A EP3533739B1 EP 3533739 B1 EP3533739 B1 EP 3533739B1 EP 19154516 A EP19154516 A EP 19154516A EP 3533739 B1 EP3533739 B1 EP 3533739B1
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EP
European Patent Office
Prior art keywords
negative pressure
workstations
additional
textile machine
spinning
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Application number
EP19154516.9A
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German (de)
French (fr)
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EP3533739A1 (en
Inventor
Dirk Brakensiek
Bert Schlömer
Detlef Schelter
Michael Spitzer
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Saurer Spinning Solutions GmbH and Co KG
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Saurer Spinning Solutions GmbH and Co KG
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Publication of EP3533739A1 publication Critical patent/EP3533739A1/en
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H54/00—Winding, coiling, or depositing filamentary material
    • B65H54/02—Winding and traversing material on to reels, bobbins, tubes, or like package cores or formers
    • B65H54/22—Automatic winding machines, i.e. machines with servicing units for automatically performing end-finding, interconnecting of successive lengths of material, controlling and fault-detecting of the running material and replacing or removing of full or empty cores
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H54/00—Winding, coiling, or depositing filamentary material
    • B65H54/70—Other constructional features of yarn-winding machines
    • B65H54/707—Suction generating system
    • D—TEXTILES; PAPER
    • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
    • D01H—SPINNING OR TWISTING
    • D01H11/00—Arrangements for confining or removing dust, fly or the like
    • D01H11/005—Arrangements for confining or removing dust, fly or the like with blowing and/or suction devices
    • D—TEXTILES; PAPER
    • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
    • D01H—SPINNING OR TWISTING
    • D01H4/00—Open-end spinning machines or arrangements for imparting twist to independently moving fibres separated from slivers; Piecing arrangements therefor; Covering endless core threads with fibres by open-end spinning techniques
    • D01H4/04—Open-end spinning machines or arrangements for imparting twist to independently moving fibres separated from slivers; Piecing arrangements therefor; Covering endless core threads with fibres by open-end spinning techniques imparting twist by contact of fibres with a running surface
    • D01H4/06—Open-end spinning machines or arrangements for imparting twist to independently moving fibres separated from slivers; Piecing arrangements therefor; Covering endless core threads with fibres by open-end spinning techniques imparting twist by contact of fibres with a running surface co-operating with suction means
    • D—TEXTILES; PAPER
    • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
    • D01H—SPINNING OR TWISTING
    • D01H4/00—Open-end spinning machines or arrangements for imparting twist to independently moving fibres separated from slivers; Piecing arrangements therefor; Covering endless core threads with fibres by open-end spinning techniques
    • D01H4/04—Open-end spinning machines or arrangements for imparting twist to independently moving fibres separated from slivers; Piecing arrangements therefor; Covering endless core threads with fibres by open-end spinning techniques imparting twist by contact of fibres with a running surface
    • D01H4/08—Rotor spinning, i.e. the running surface being provided by a rotor
    • D—TEXTILES; PAPER
    • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
    • D01H—SPINNING OR TWISTING
    • D01H4/00—Open-end spinning machines or arrangements for imparting twist to independently moving fibres separated from slivers; Piecing arrangements therefor; Covering endless core threads with fibres by open-end spinning techniques
    • D01H4/42—Control of driving or stopping
    • D01H4/44—Control of driving or stopping in rotor spinning
    • D—TEXTILES; PAPER
    • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
    • D01H—SPINNING OR TWISTING
    • D01H4/00—Open-end spinning machines or arrangements for imparting twist to independently moving fibres separated from slivers; Piecing arrangements therefor; Covering endless core threads with fibres by open-end spinning techniques
    • D01H4/48—Piecing arrangements; Control therefor
    • D01H4/50—Piecing arrangements; Control therefor for rotor spinning
    • D—TEXTILES; PAPER
    • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
    • D01H—SPINNING OR TWISTING
    • D01H5/00—Drafting machines or arrangements ; Threading of roving into drafting machine
    • D01H5/18—Drafting machines or arrangements without fallers or like pinned bars
    • D01H5/60—Arrangements maintaining drafting elements free of fibre accumulations
    • D01H5/66—Suction devices exclusively
    • D—TEXTILES; PAPER
    • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
    • D01H—SPINNING OR TWISTING
    • D01H5/00—Drafting machines or arrangements ; Threading of roving into drafting machine
    • D01H5/18—Drafting machines or arrangements without fallers or like pinned bars
    • D01H5/60—Arrangements maintaining drafting elements free of fibre accumulations
    • D01H5/66—Suction devices exclusively
    • D01H5/68—Suction end-catchers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2701/00—Handled material; Storage means
    • B65H2701/30—Handled filamentary material
    • B65H2701/31—Textiles threads or artificial strands of filaments

Definitions

  • the invention relates to a method for operating a textile machine and a textile machine with several similar work stations, each of which has a basic negative pressure requirement for regular production operations and an additional negative pressure requirement after an interruption in production at the work location, and with a suction air system with a limited suction power to provide the negative pressure at the workplaces.
  • Such a textile machine has a suction air system with at least one controllable suction air unit, the suction power of which can be regulated via the speed of a drive motor.
  • the vacuum requirement of an individual job can, however, especially if the jobs, such as in the DE 101 39 075 A1 described, as essentially self-sufficient workplaces are designed to increase significantly at times.
  • Workplaces of open-end rotor spinning machines always have such an increased additional vacuum requirement, for example, when new spinning has to be carried out at a workstation. This means when, after a spinning interruption, the thread end that has accumulated on the surface of a cheese has to be searched for, picked up by a workstation's own vacuum nozzle, transported to the associated open-end spinning device and prepared there for the piecing process.
  • open-end rotor spinning machines are usually equipped with a suction air system, in which the speed of the drive motor of the suction air unit can be increased to a maximum speed if necessary to increase the vacuum level
  • these known textile machines often result in considerable difficulties when the suction air requirement of the textile machine overall is above the maximum suction air supply of the suction air system concerned.
  • the suction air system of the textile machine although the drive motor of the suction air unit is already running at maximum speed, cannot provide enough negative pressure to simultaneously supply all workplaces that require additional negative pressure with the necessary suction air, without the spinning negative pressure required by the workplaces simultaneously falling a minimum level drops.
  • suction air is constantly required, for example to operate a bobbin dedusting system, i.e. a device that ensures that the dirt and dust produced when the thread runs off the bobbin is disposed of during the winding process.
  • a bobbin dedusting system i.e. a device that ensures that the dirt and dust produced when the thread runs off the bobbin is disposed of during the winding process.
  • the workplaces of such textile machines have what is known as a thread catching nozzle, which is also constantly supplied with suction air during the rewinding process.
  • textile machines of this type also have, for example, in the DE 44 46 379 A or in the DE 195 11 960 A1 described, via a machine's own suction air system with a suction air unit, the drive motor of which is connected to a frequency converter and its speed can be set in a defined manner. This means that the speed of the drive motor can be adjusted within certain limits according to the suction air requirement of the textile machine.
  • the drive motor of the suction air unit runs during the regular work process preferably at a speed at which the negative pressure in the suction air system does not fall below a certain minimum level, i.e. at which the so-called basic suction air requirement of the textile machine is met.
  • the speed of the drive motor of the suction air unit is increased in order to provide a predeterminable increased vacuum, and in this way the increased demand for suction air is realized.
  • the speed of the drive motor of the suction air unit is adjusted so that the pressure level in the suction air system is always kept at a minimum value when processing the first event that requires additional suction air and other similar events that have occurred in the meantime. After the last of these events has been processed, the speed of the drive motor of the suction air unit is then regulated back to the speed to cover the basic vacuum requirement.
  • the invention is based on the object of developing a method which enables the numerous workstations of a textile machine producing cross-wound bobbins to be restarted as quickly as possible, even when difficult conditions exist.
  • a method for operating a textile machine with several similar work stations each of which has a basic negative pressure requirement for regular production operations and an additional negative pressure requirement after a production interruption at the work location, and with a suction air system with a limited suction power to provide the negative pressure proposed to the workplaces.
  • a minimum negative pressure is specified here.
  • the number of workplaces simultaneously supplied with additional negative pressure is limited so that the minimum negative pressure is not undershot.
  • a sub-negative pressure is specified which is below the minimum negative pressure and, in the event of a specified event, the number of workplaces simultaneously supplied with additional negative pressure is limited so that the sub-negative pressure is not undershot.
  • the method according to the invention has the particular advantage that in this way the suction air potential made available by the suction air system of the textile machine can be used to a greater extent for the additional supply of jobs.
  • the drive motor of the suction air unit of the suction air system preferably runs simultaneously at maximum speed and generates a maximum compressed air potential in the suction air system of the textile machine.
  • a relatively large vacuum reserve is then available, which can advantageously be used to supply a large number of workplaces with additional compressed air and thus to resume production of a large number of other workplaces. In the case of an open-end rotor spinning machine, production is resumed by re-spinning the workplaces.
  • the invention creates a maximum of quality with an optimized production speed. It is ensured that the minimum negative pressure required for quality in regular production operations is maintained.
  • the negative pressure is only lowered to the sub-negative pressure in the event of certain predetermined events in order to be able to resume regular production as quickly as possible.
  • the quality losses that may occur as a result of the lower negative pressure are hardly significant overall, since the sub-negative pressure is only set for a short time.
  • the event is the start-up of the textile machine after a machine standstill, during which all workplaces have an additional vacuum requirement in order to resume production. If the sub-vacuum is set after a machine standstill, the workstations of the textile machine can resume their regular production operations as quickly as possible. Such machine downtimes can be caused, for example, by malfunctions in the power supply equipment or by lot changes.
  • the event is the start-up of a group of workstations which at the same time have an additional vacuum requirement.
  • Such a definition of the event is particularly useful in multi-batch operation of the textile machine.
  • a multi-lot operation there can be several groups of workplaces on which different lots are produced.
  • a group of workplaces is then formed from several workplaces on which the same batch is produced.
  • this group of workplaces then simultaneously has an additional vacuum requirement.
  • the number of workplaces that can be simultaneously supplied with additional negative pressure is increased from a somewhat low number to a significantly larger number.
  • the number of jobs that can be supplied with additional negative pressure at the same time can for example be increased from about ten jobs to about twenty jobs, as has been customary up to now, which almost halves the start-up time of the textile machine that has hitherto been customary.
  • the number of workplaces that can be supplied with additional negative pressure at the same time is not only dependent on the sub-negative pressure set, but also on other, in some cases quite different, factors.
  • the maximum number of workplaces that can be supplied with additional negative pressure at the same time also depends, for example, on the material and the material thickness of the bobbins to be produced on the workplaces, the degree of soiling of the dirt chambers of the suction air system, the installation height of the textile machine and similar parameters.
  • Coarser and hairier yarns require a higher negative pressure than fine, smoother yarns in order to suck off a yarn end from a pay-off bobbin and to be able to prepare and splice the yarn end in preparation tubes for a yarn splice.
  • the temporary lowering of the level of the negative pressure prevailing in the suction air system to a sub-negative pressure can be set by the operating personnel in a defined manner. This means that by lowering the level of the negative pressure in the suction air system to a temporary sub-negative pressure, which can be initiated by the operating personnel, if necessary, especially after a machine standstill, it is possible to react immediately in such a way that the subsequent production start of the workstations of the textile machine as much as possible demanded a short period of time.
  • a textile machine with several similar work stations each of which has a basic negative pressure requirement for regular production operations and an additional negative pressure requirement after an interruption in production at the work station, and with a suction air system with a limited suction power to provide the negative pressure at the work stations is also proposed .
  • the control device can also be given a sub-negative pressure which is below the minimum negative pressure.
  • the control device is designed to temporarily limit the number of workplaces simultaneously supplied with additional negative pressure in the event of a predetermined event so that the sub-negative pressure is not undershot.
  • the operator can therefore enter two negative pressures on the control device. These are, on the one hand, the minimum negative pressure, which is used by the control device in regular production operation as the lower limit, and, on the other hand, the sub-negative pressure to which the negative pressure is lowered by the control device during the specified event.
  • the textile machine according to the invention with its control device is designed to carry out the method according to the invention and its preferred embodiments.
  • the start-up of the textile machine after a machine standstill, in which all workplaces have an additional vacuum requirement is stored as an event in the control device.
  • the start-up of a group of workstations that simultaneously have an additional vacuum requirement can also be stored as an event in the control device.
  • the temporary lowering of the spinning vacuum preferably increases the number of work stations that can be simultaneously supplied with additional vacuum from a first number to a second number.
  • the method according to the invention is preferably used in connection with an open-end rotor spinning machine and the textile machine according to the invention is preferably designed as an open-end rotor spinning machine.
  • the production company is thus a spinning company. After the production interruption, that is to say in this case a spinning interruption, the additional negative pressure is required for the re-spinning of the job.
  • the negative pressure is the spinning negative pressure.
  • the Figure 1 shows, based on a diagram through a curve 1, the negative pressure profile p in the suction air system of a textile machine.
  • Curve 1 shows the negative pressure profile p both during regular spinning operation and after restarting the textile machine after a lot change or an involuntary machine standstill. Curve 1 specifically shows the predeterminable level of the spinning vacuum that is present in the rotor housings of the open-end spinning devices in the area of the work stations of a rotor spinning machine.
  • Curve 2 shows schematically the speed profile of the drive motor of the suction air unit of the textile machine, i.e. the speed profile of the drive motor both during regular spinning operation and after restarting the textile machine after a lot change or an involuntary machine standstill.
  • Z 1 shows the number of jobs that can additionally be supplied with negative pressure when the jobs work with a minimum spinning negative pressure p min .
  • Z 2 reveals the number of jobs that can additionally be supplied with negative pressure when the jobs are operated with a sub-spinning negative pressure p sub .
  • the abscissa shows the course of the method according to the invention over time, the various points in time described in more detail below being identified by A, B, C, etc.
  • the level of the spinning vacuum prevailing in the rotor housings is indicated by p and the speed level of the drive motor of the suction air unit of the textile machine is indicated by d.
  • the drive motor of the suction air unit of the open-end rotor spinning machine runs during the regular spinning operation of the textile machine at a speed d max compared to its maximum speed. lower speed d is .
  • a predeterminable minimum spinning vacuum p min prevails during this time. Since all workplaces are initially running properly, the number of workplaces to be supplied with additional negative pressure at the same time is 0.
  • control device of the textile machine ensures that the drive motor of the suction air unit is set to its maximum speed d max . is accelerated. This maximum speed d max . is reached at time B, for example.
  • the level of the spinning negative pressure in the suction air system would be if at time B there was no additional negative pressure requirement due to the aforementioned workplaces to be re-spun, as indicated by the dashed line 1 ', to a maximum spinning vacuum p max . increase, which is well above the minimum spinning vacuum p min . would be.
  • the control of the textile machine has at the same time derived from the difference between the maximum spinning vacuum p max . and the minimum spinning vacuum p min . as well as the additional negative pressure consumption of an individual job, the number Z 1 of jobs is calculated that from time B is simultaneously supplied with additional negative pressure, that is, can be spun again at the same time without the spinning negative pressure in the suction air system falling below the minimum spinning negative pressure p min . drops, that is, despite the supply of a number Z 1 of work stations with additional negative pressure, the spinning negative pressure in the suction air system remains at a minimum spinning negative pressure p min .
  • the maximum speed d max of the drive motor of the suction air unit is again reduced to speed d ist , which happened at time D.
  • the level of the spinning negative pressure in the suction air system remains at a minimum spinning negative pressure Pmin.
  • the point in time at which a major malfunction occurs is shown with E. That is, at time E, the rotor spinning machine switches off, for example due to a fault in the power supply devices, and comes to a standstill, which happened at time F. At time F, the speed of the drive motor is do and the spinning vacuum in the suction air system is correspondingly p 0 .
  • the operating personnel sets a sub-spinning vacuum p sub on the control of the textile machine. That means when starting up the open-end rotor spinning machine there is temporarily a sub-spinning negative pressure p sub in the area of the suction air system of the textile machine , which is below the minimum spinning negative pressure p min which is usual during regular spinning operation of the rotor spinning machine. lies.
  • the rotor spinning machine is restarted at time G. Since at time G there are a large number of additional suction air requests from workplaces that all want to spin again immediately after the incident, the control device of the textile machine immediately ensures that the drive motor of the suction air unit is set to its maximum speed d max . accelerated, which is reached at time H. This means that if there were no additional negative pressure requirement from jobs that want to piecing, a maximum spinning negative pressure p max would now be in the suction air system of the textile machine, as indicated by the dashed curve 1 '. to rule. However, in the control device of the textile machine, the difference between the set sub-spinning negative pressure p sub and the maximum spinning negative pressure p max .
  • the number Z 2 of work stations is calculated that can be simultaneously supplied with additional suction air while the textile machine is running without the risk of the negative pressure in the suction air system of the textile machine falling below the specified sub-spinning negative pressure p sub decreases.
  • the control of the textile machine corrects the negative spinning pressure set in the suction air system of the textile machine. This means that the sub-spinning negative pressure p sub temporarily set when the open-end rotor spinning machine is started up is again reduced to the minimum spinning negative pressure p min which is usual during regular spinning operation of the rotor spinning machine. raised.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Spinning Or Twisting Of Yarns (AREA)
  • Looms (AREA)
  • Treatment Of Fiber Materials (AREA)

Description

Die Erfindung betrifft ein Verfahren zum Betreiben einer Textilmaschine und eine Textilmaschine mit mehreren gleichartigen Arbeitsstellen, die jeweils einen Grundbedarf an Unterdruck für den regulären Produktionsbetrieb und zusätzlichen Unterdruckbedarf nach einer Produktionsunterbrechung an der Arbeitsstelle haben, und mit einer Saugluftanlage mit einer begrenzten Saugleistung zur Bereitstellung des Unterdrucks an den Arbeitsstellen.The invention relates to a method for operating a textile machine and a textile machine with several similar work stations, each of which has a basic negative pressure requirement for regular production operations and an additional negative pressure requirement after an interruption in production at the work location, and with a suction air system with a limited suction power to provide the negative pressure at the workplaces.

Im Zusammenhang mit Textilmaschinen, insbesondere Kreuzspulen herstellenden Textilmaschinen, die eine Vielzahl gleichartiger Arbeitsstellen aufweisen, beispielsweise Kreuzspulautomaten oder Offenend-Rotorspinnmaschinen, ist es bekannt, dass die Arbeitsstellen derartiger Textilmaschinen, um ordnungsgemäß arbeiten zu können, während ihres Betriebes ständig mit Saugluft versorgt werden müssen. Eine solche Textilmaschine verfügt über eine Saugluftanlage mit wenigstens einem ansteuerbaren Saugluftaggregat, dessen Saugleistung über die Drehzahl eines Antriebsmotors regulierbar ist.In connection with textile machines, in particular textile machines producing cross-wound bobbins, which have a large number of similar workstations, for example automatic cross-winding machines or open-end rotor spinning machines, it is known that the workstations of such textile machines, in order to be able to work properly, have to be constantly supplied with suction air during their operation. Such a textile machine has a suction air system with at least one controllable suction air unit, the suction power of which can be regulated via the speed of a drive motor.

Zum Betreiben der Arbeitsstellen von Offenend-Rotorspinnmaschinen wird beispielsweise ständig so genannter Spinnunterdruck benötigt. Dieser jeweils in den Rotorgehäusen der Offenend-Spinnvorrichtungen anstehende Spinnunterdruck sorgt während des Spinnbetriebes dafür, dass die von einer so genannten Auflösewalze aus einem Vorlagefaserband ausgekämmten Einzelfasern über einen Faserleitkanal pneumatisch in einen Spinnrotor eingespeist und von dem mit hoher Drehzahl umlaufenden Spinnrotor zu einem Faden gedreht werden. Das heißt, die Arbeitsstellen von Offenend-Rotorspinnmaschinen weisen während des regulären Spinnbetriebes einen bestimmten, nahezu konstanten Grundbedarf an Unterdruck auf.To operate the work stations of open-end rotor spinning machines, what is known as a spinning vacuum is constantly required, for example. This negative spinning pressure in the rotor housings of the open-end spinning devices ensures during the spinning operation that the individual fibers combed out of a feed sliver by a so-called opening roller are pneumatically fed into a spinning rotor via a fiber guide channel and turned into a thread by the spinning rotor rotating at high speed . This means that the workplaces of open-end rotor spinning machines have a certain, almost constant basic requirement for negative pressure during regular spinning operation.

Der Unterdruckbedarf einer einzelnen Arbeitsstelle kann sich allerdings, insbesondere wenn die Arbeitsstellen, wie beispielsweise in der DE 101 39 075 A1 beschrieben, als im Wesentlichen autark arbeitende Arbeitsstellen ausgebildet sind, zeitweise deutlich erhöhen. Einen solchen erhöhten zusätzlichen Unterdruckbedarf weisen Arbeitsstellen von Offenend-Rotorspinnmaschinen beispielsweise immer dann auf, wenn an einer Arbeitsstelle neu angesponnen werden muss. Das heißt, wenn nach einer Spinnunterbrechung das auf die Oberfläche einer Kreuzspule aufgelaufene Fadenende durch eine arbeitsstelleneigene, unterdruckbeaufschlagbare Saugdüse gesucht, aufgenommen, zu der zugehörigen Offenend-Spinnvorrichtung transportiert und dort für den Anspinnvorgang vorbereitet werden muss. Obwohl Offenend-Rotorspinnmaschinen in der Regel mit einer Saugluftanlage ausgestattet sind, bei der bei Bedarf zur Erhöhung des Unterdruckniveaus die Drehzahl des Antriebsmotors des Saugluftaggregates bis auf eine Maximaldrehzahl gesteigert werden kann, ergeben sich bei diesen bekannten Textilmaschinen oft erhebliche Schwierigkeiten, wenn der Saugluftbedarf der Textilmaschine insgesamt über dem maximalen Saugluftangebot der betreffenden Saugluftanlage liegt. Das heißt, die Saugluftanlage der Textilmaschine kann, obwohl der Antriebsmotor des Saugluftaggregates bereits mit Maximaldrehzahl läuft, nicht genügend Unterdruck bereitstellen, um alle Arbeitsstellen, die zusätzlichen Unterdruck anfordern, gleichzeitig mit der nötigen Saugluft versorgen, ohne dass gleichzeitig der von den Arbeitsstellen benötigte Spinnunterdruck unter ein Mindestniveau absinkt.The vacuum requirement of an individual job can, however, especially if the jobs, such as in the DE 101 39 075 A1 described, as essentially self-sufficient workplaces are designed to increase significantly at times. Workplaces of open-end rotor spinning machines always have such an increased additional vacuum requirement, for example, when new spinning has to be carried out at a workstation. This means when, after a spinning interruption, the thread end that has accumulated on the surface of a cheese has to be searched for, picked up by a workstation's own vacuum nozzle, transported to the associated open-end spinning device and prepared there for the piecing process. Although open-end rotor spinning machines are usually equipped with a suction air system, in which the speed of the drive motor of the suction air unit can be increased to a maximum speed if necessary to increase the vacuum level, these known textile machines often result in considerable difficulties when the suction air requirement of the textile machine overall is above the maximum suction air supply of the suction air system concerned. This means that the suction air system of the textile machine, although the drive motor of the suction air unit is already running at maximum speed, cannot provide enough negative pressure to simultaneously supply all workplaces that require additional negative pressure with the necessary suction air, without the spinning negative pressure required by the workplaces simultaneously falling a minimum level drops.

Nach einem Maschinenstillstand können folglich stets nur eine sehr begrenzte Anzahl von Arbeitsstellen gleichzeitig mit zusätzlicher Saugluft versorgt und damit gleichzeitig neu angesponnen werden, mit der Folge, dass es eine geraume Zeit dauert, bis eine Offenend-Rotorspinnmaschine nach einem Maschinenstillstand wieder vollständig neu hochgefahren ist. Solche Maschinenstillstände treten insbesondere in so genannten Dritt- oder Entwicklungsländern relativ häufig auf, da in diesen Ländern Störungen in den Stromversorgungseinrichtungen nicht selten sind und solche Störungen häufig zu einem Abschalten der Textilmaschinen führen.After a machine standstill, only a very limited number of work stations can be simultaneously supplied with additional suction air and thus re-spun at the same time, with the result that it takes a long time before an open-end rotor spinning machine is completely restarted after a machine standstill. Such machine standstills occur relatively frequently, especially in so-called third or developing countries, since faults in the power supply facilities are not uncommon in these countries and such faults often lead to the textile machines being switched off.

Ein Maschinenstillstand ist allerdings auch bei einem regulären Partiewechsel gegeben. Auch in einem solchen Fall dauert es eine relativ lange Zeit, bis aufgrund der begrenzten Anzahl der jeweils gleichzeitig zusätzlich mit Unterdruck versorgbaren Arbeitsstellen eine Offenend-Rotorspinnmaschine wieder neu angesponnen ist.However, a machine downtime is also given with a regular lot change. In such a case, too, it takes a relatively long time until an open-end rotor spinning machine is spun again due to the limited number of work stations that can be additionally supplied with negative pressure at the same time.

Auch an den Arbeitsstellen von Kreuzspulautomaten wird ständig Saugluft benötigt, um beispielsweise eine Kopsentstaubung zu betreiben, das heißt, eine Einrichtung, die während des Umspulprozesses dafür sorgt, dass der beim Ablaufen des Fadens vom Spinnkops entstehende Schmutz und Staub entsorgt wird. Außerdem verfügen die Arbeitsstellen solcher Textilmaschinen über eine so genannte Fadenfangdüse, die während des Umspulprozesses ebenfalls ständig mit Saugluft beaufschlagt ist.Even at the workplaces of automatic package winder, suction air is constantly required, for example to operate a bobbin dedusting system, i.e. a device that ensures that the dirt and dust produced when the thread runs off the bobbin is disposed of during the winding process. In addition, the workplaces of such textile machines have what is known as a thread catching nozzle, which is also constantly supplied with suction air during the rewinding process.

An den Arbeitsstellen solcher Textilmaschinen entsteht des Weiteren ein nicht unerheblicher zusätzlicher Saugluftbedarf, wenn es zu einem Fadenbruch gekommen ist, oder wenn der Faden durch einen kontrollierten Reinigerschnitt getrennt wurde. In diesen Fällen kommen arbeitsstelleneigene, unterdruckbeaufschlagbare Fadenhandhabungseinrichtungen zum Einsatz, die dafür sorgen, dass der Spulprozess an der betreffenden Arbeitsstelle möglichst rasch wieder aufgenommen werden kann.At the workplaces of such textile machines, there is also a not inconsiderable additional need for suction air if a thread breakage has occurred or if the thread has been separated by a controlled cleaner cut. In these cases, the workstation's own thread handling devices that can be subjected to negative pressure come into play Use that ensures that the winding process can be resumed as quickly as possible at the relevant work site.

Um den Saugluftbedarf ihrer Arbeitsstellen, der, wie vorstehend angedeutet, recht unterschiedlich sein kann, decken zu können, verfügen auch derartige Textilmaschinen, wie beispielsweise in der DE 44 46 379 A oder in der DE 195 11 960 A1 beschrieben, über eine maschineneigene Saugluftanlage mit einem Saugluftaggregat, dessen Antriebsmotor an einen Frequenzumrichter angeschlossen und bezüglich seiner Drehzahl definiert einstellbar ist. Das heißt, die Drehzahl des Antriebsmotors kann entsprechend des Saugluftbedarfs der Textilmaschine innerhalb bestimmter Grenzen angepasst werden.In order to be able to cover the suction air requirement of their workplaces, which, as indicated above, can be quite different, textile machines of this type also have, for example, in the DE 44 46 379 A or in the DE 195 11 960 A1 described, via a machine's own suction air system with a suction air unit, the drive motor of which is connected to a frequency converter and its speed can be set in a defined manner. This means that the speed of the drive motor can be adjusted within certain limits according to the suction air requirement of the textile machine.

Bei solchen Textilmaschinen läuft der Antriebsmotor des Saugluftaggregates während des regulären Arbeitsprozesses vorzugsweise mit einer Drehzahl, bei der der Unterdruck in der Saugluftanlage ein bestimmtes Mindestniveau nicht unterschreitet, das heißt, bei der der so genannte Saugluft-Grundbedarf der Textilmaschine gedeckt ist.In such textile machines, the drive motor of the suction air unit runs during the regular work process preferably at a speed at which the negative pressure in the suction air system does not fall below a certain minimum level, i.e. at which the so-called basic suction air requirement of the textile machine is met.

Bei der Meldung eines Ereignisses, das in der Folge zu einem erhöhten Saugluftbedarf führt, wird, um einen vorgebbaren erhöhten Unterdruck bereitzustellen, die Drehzahl des Antriebsmotors des Saugluftaggregats gesteigert und auf diese Weise der erhöhte Saugluftbedarf realisiert. Die Drehzahl des Antriebsmotors des Saugluftaggregats wird dabei jeweils so angepasst, dass bei der Abarbeitung des ersten zusätzliche Saugluft benötigenden Ereignisses sowie weiterer zwischenzeitlich eintretender ähnlicher Ereignisse das Druckniveau in der Saugluftanlage stets auf einem Mindestwert gehalten wird. Nach Abarbeitung des letzten dieser Ereignisse wird die Drehzahl des Antriebsmotors des Saugluftaggregats dann wieder auf die Drehzahl zur Deckung des Unterdruck-Grundbedarfs zurückgeregelt.When an event is reported that subsequently leads to an increased demand for suction air, the speed of the drive motor of the suction air unit is increased in order to provide a predeterminable increased vacuum, and in this way the increased demand for suction air is realized. The speed of the drive motor of the suction air unit is adjusted so that the pressure level in the suction air system is always kept at a minimum value when processing the first event that requires additional suction air and other similar events that have occurred in the meantime. After the last of these events has been processed, the speed of the drive motor of the suction air unit is then regulated back to the speed to cover the basic vacuum requirement.

Die in der DE 44 46 379 A oder in der DE 195 11 960 A beschriebenen Verfahren gehen dabei vom so genannten Minimalprinzip aus, bei dem versucht wird, mit geringstem Mitteleinsatz ein bestimmtes Ziel zu erreichen. Die vorbeschriebenen Verfahren sind allerdings nur dann erfolgreich einsetzbar, wenn das Angebot an Saugluft stets über der Nachfrage nach Saugluft liegt.The one in the DE 44 46 379 A or in the DE 195 11 960 A The procedures described are based on the so-called minimum principle, in which an attempt is made to achieve a specific goal with the least amount of resources. The methods described above can only be used successfully if the supply of suction air is always greater than the demand for suction air.

Durch die DE 10 2007 006 679 A1 ist außerdem ein Verfahren bekannt, das nach dem Maximalprinzip arbeitet. Das heißt, bei diesem bekannten Verfahren wird aus der maximalen Saugleistung der Saugluftanlage, die durch die bekannte Maximaldrehzahl des Antriebsmotors des Saugluftaggregats vorgegeben ist sowie aus der vorliegenden Ist-Drehzahl des Antriebsmotors des Saugluftaggregats, die sich aus dem augenblicklichen Unterdruckbedarf der Textilmaschine ergibt, ein Wert für eine Drehzahlreserve berechnet, anhand dessen die Anzahl der noch mit zusätzlichem Unterdruck versorgbaren Arbeitsstellen bestimmt wird. Aus dieser Anzahl wird, erhöht um die Anzahl der momentan bereits auf der Basis der Ist-Drehzahl des Antriebsmotors mit zusätzlichem Unterdruck versorgten Arbeitsstellen, eine Höchstanzahl von Arbeitsstellen ermittelt, die noch gleichzeitig mit zusätzlichem Unterdruck versorgt werden können. Unterdruck-Anforderungen von Arbeitsstellen, die diese Höchstanzahl von zusätzlich versorgbaren Arbeitsstellen überschreiten, werden - zumindest zunächst - abgewiesen.Through the DE 10 2007 006 679 A1 a method is also known which works according to the maximum principle. This means that in this known method, the maximum suction power of the suction air system, which is specified by the known maximum speed of the drive motor of the suction air unit, and the present actual speed of the drive motor of the suction air unit, which is derived from the current vacuum requirement of the Textile machine results, a value for a speed reserve is calculated, based on which the number of jobs that can still be supplied with additional negative pressure is determined. From this number, increased by the number of workplaces currently already supplied with additional negative pressure on the basis of the actual speed of the drive motor, a maximum number of workplaces is determined that can still be supplied with additional negative pressure at the same time. Vacuum requirements from workplaces that exceed this maximum number of additional workplaces that can be supplied are - at least initially - rejected.

Ausgehend vom vorstehend beschriebenen Stand der Technik, liegt der Erfindung die Aufgabe zugrunde, ein Verfahren zu entwickeln, das auch beim Vorliegen schwieriger Bedingungen eine möglichst zügige Wiederinbetriebnahme der zahlreichen Arbeitsstellen einer Kreuzspulen herstellenden Textilmaschine ermöglicht.Proceeding from the prior art described above, the invention is based on the object of developing a method which enables the numerous workstations of a textile machine producing cross-wound bobbins to be restarted as quickly as possible, even when difficult conditions exist.

Zur Lösung der Aufgabe wird eine Verfahren zum Betreiben einer Textilmaschine mit mehreren gleichartigen Arbeitsstellen, die jeweils einen Grundbedarf an Unterdruck für den regulären Produktionsbetrieb und zusätzlichen Unterdruckbedarf nach einer Produktionsunterbrechung an der Arbeitsstelle haben, und mit einer Saugluftanlage mit einer begrenzten Saugleistung zur Bereitstellung des Unterdrucks an den Arbeitsstellen vorgeschlagen. Dabei wird ein Mindest-Unterdruck vorgegeben. Die Anzahl der gleichzeitig mit zusätzlichem Unterdruck versorgten Arbeitsstellen wird so begrenzt, dass der Mindest-Unterdruck nicht unterschritten wird. Erfindungsgemäß wird ein Sub-Unterdruck vorgegeben, der unter dem Mindest-Unterdruck liegt und bei einem vorgegebenen Ereignis temporär die Anzahl der gleichzeitig mit zusätzlichem Unterdruck versorgten Arbeitsstellen so begrenzt wird, dass der Sub-Unterdruck nicht unterstritten wird.To solve the problem, a method for operating a textile machine with several similar work stations, each of which has a basic negative pressure requirement for regular production operations and an additional negative pressure requirement after a production interruption at the work location, and with a suction air system with a limited suction power to provide the negative pressure proposed to the workplaces. A minimum negative pressure is specified here. The number of workplaces simultaneously supplied with additional negative pressure is limited so that the minimum negative pressure is not undershot. According to the invention, a sub-negative pressure is specified which is below the minimum negative pressure and, in the event of a specified event, the number of workplaces simultaneously supplied with additional negative pressure is limited so that the sub-negative pressure is not undershot.

Vorteilhafte Ausführungsformen des erfindungsgemäßen Verfahrens sind Gegenstand der Unteransprüche.Advantageous embodiments of the method according to the invention are the subject of the subclaims.

Das erfindungsgemäße Verfahren hat insbesondere den Vorteil, dass auf diese Weise das von der Saugluftanlage der Textilmaschine zur Verfügung gestellte Saugluftpotential in einem größeren Maße zur zusätzlichen Versorgung von Arbeitsstellen ausgenutzt werden kann. Das heißt, die Arbeitsstellen der Textilmaschine weisen, da der zunächst als Betriebsdruck eingestellte Sub-Unterdruck unter dem während des regulären Betriebes üblichen Mindest-Unterdruck liegt, einen deutlich geringeren Saugluftbedarf auf, als Arbeitsstellen, bei denen der Mindest-Unterdruck anliegt.The method according to the invention has the particular advantage that in this way the suction air potential made available by the suction air system of the textile machine can be used to a greater extent for the additional supply of jobs. This means that the workstations of the textile machine, since the sub-vacuum initially set as the operating pressure is below the minimum negative pressure customary during regular operation, have a significantly lower suction air requirement than workstations at which the minimum negative pressure is applied.

Der Antriebsmotor des Saugluftaggregates der Saugluftanlage läuft vorzugsweise gleichzeitig mit Maximaldrehzahl und erzeugt dabei in der Saugluftanlage der Textilmaschine ein maximales Druckluftpotential. Dann steht eine relativ große Unterdruckreserve bereit, die vorteilhaft zur Versorgung einer größeren Anzahl von Arbeitsstellen mit zusätzlicher Druckluft und damit zur Wiederaufnahme der Produktion einer Vielzahl weiterer Arbeitsstellen genutzt werden kann. Im Falle einer Offenend-Rotorspinnmaschine erfolgt die Wiederaufnahme der Produktion durch Neuanspinnen der Arbeitsstellen.The drive motor of the suction air unit of the suction air system preferably runs simultaneously at maximum speed and generates a maximum compressed air potential in the suction air system of the textile machine. A relatively large vacuum reserve is then available, which can advantageously be used to supply a large number of workplaces with additional compressed air and thus to resume production of a large number of other workplaces. In the case of an open-end rotor spinning machine, production is resumed by re-spinning the workplaces.

Die Erfindung schafft ein Maximum an Qualität bei optimierter Produktionsgeschwindigkeit. Es wird sichergestellt, dass der im regulären Produktionsbetrieb für die Qualität erforderliche Mindest-Unterdruck eingehalten wird. Nur bei bestimmten vorgebenden Ereignissen wird der Unterdruck auf den Sub-Unterdruck abgesenkt, um die reguläre Produktion möglichst schnell wieder aufnehmen zu können. Die durch den geringeren Unterdruck ggf. auftretenden Qualitätseinbußen fallen insgesamt kaum ins Gewicht, da der Sub-Unterdruck nur kurzzeitig eingestellt wird.The invention creates a maximum of quality with an optimized production speed. It is ensured that the minimum negative pressure required for quality in regular production operations is maintained. The negative pressure is only lowered to the sub-negative pressure in the event of certain predetermined events in order to be able to resume regular production as quickly as possible. The quality losses that may occur as a result of the lower negative pressure are hardly significant overall, since the sub-negative pressure is only set for a short time.

In vorteilhafter Ausführungsform ist das Ereignis der Hochlauf der Textilmaschine nach einem Maschinenstillstand, bei dem alle Arbeitsstellen einen zusätzlichen Unterdruckbedarf haben, um die Produktion wieder aufzunehmen. Wenn nach einem Maschinenstillstand der Sub-Unterdruck eingestellt wird, können die Arbeitsstellen der Textilmaschine möglichst schnell ihren regulären Produktionsbetrieb wieder aufnehmen. Solche Maschinenstillstände können beispielsweise durch Störungen in den Stromversorgungseinrichtungen oder auch Partiewechsel verursacht werden.In an advantageous embodiment, the event is the start-up of the textile machine after a machine standstill, during which all workplaces have an additional vacuum requirement in order to resume production. If the sub-vacuum is set after a machine standstill, the workstations of the textile machine can resume their regular production operations as quickly as possible. Such machine downtimes can be caused, for example, by malfunctions in the power supply equipment or by lot changes.

Die Erfahrung zeigt, dass insbesondere in so genannten Dritt- oder Entwicklungsstaaten Stromstörungen recht häufig auftretende Ereignisse sind und damit ungewollte Maschinenstillstände fast regelmäßig auftreten.Experience shows that, especially in so-called third or developing countries, power disruptions are quite frequent occurrences and thus unwanted machine downtimes occur almost regularly.

Da sowohl bei einer Stromstörung als auch bei einem Partiewechsel die Textilmaschine zunächst in den Maschinenstillstand ausläuft, so dass anschließend alle Arbeitsstellen Kreuzspulen herstellender Textilmaschinen wieder die Produktion aufnehmen müssen und bekanntlich die Hochlaufzeit einer Textilmaschine immer dann relativ kurz ist, wenn möglichst viele ihrer Arbeitsstellen gleichzeitig wieder angesponnen werden, wird nach einem Maschinenstillstand durch die Einstellung eines sehr niedrigen Sub-Unterdruckes ermöglicht, die Anzahl der gleichzeitig zusätzlich mit Unterdruck versorgbaren Arbeitsstellen erheblich zu erhöhen und damit die Hochlaufzeit der Textilmaschine deutlich zu verkürzen.Since, both in the event of a power failure or when changing batches, the textile machine initially shuts down, so that all workplaces in textile machines producing cross-wound bobbins then have to resume production and, as is well known, the startup time of a textile machine is always relatively short when as many of their workplaces as possible are back at the same time are spun, after a machine standstill, the setting of a very low sub-negative pressure enables the number of workplaces that can be additionally supplied with negative pressure at the same time to be increased considerably, thus significantly reducing the start-up time of the textile machine.

Gemäß einer Alternative der vorliegenden Erfindung ist das Ereignis der Hochlauf einer Gruppe von Arbeitsstellen, die gleichzeitig einen zusätzlichen Unterdruckbedarf haben. Eine solche Definition des Ereignisses ist vor allem bei einem Mehrpartienbetrieb der Textilmaschine sinnvoll. Bei einem Mehrpartienbetrieb kann es mehrere Gruppen von Arbeitsstellen geben, auf denen unterschiedliche Partien produziert werden. Eine Gruppe von Arbeitsstellen wird dann von mehreren Arbeitsstellen gebildet, auf denen die gleiche Partie produziert wird. Bei einem Partiewechsel hat diese Gruppe von Arbeitsstellen dann gleichzeitig einen zusätzlichen Unterdruckbedarf.According to an alternative of the present invention, the event is the start-up of a group of workstations which at the same time have an additional vacuum requirement. Such a definition of the event is particularly useful in multi-batch operation of the textile machine. In a multi-lot operation, there can be several groups of workplaces on which different lots are produced. A group of workplaces is then formed from several workplaces on which the same batch is produced. In the event of a lot change, this group of workplaces then simultaneously has an additional vacuum requirement.

In vorteilhafter Ausführungsform ist des Weiteren vorgesehen, dass durch temporäre Absenkung des Spinnunterdruckes während des Hochlaufs auf den Sub-Unterdruck die Anzahl der gleichzeitig mit zusätzlichem Unterdruck versorgbaren Arbeitsstellen von einer etwas niedrigen Anzahl auf eine deutlich größere Anzahl erhöht wird. Die Anzahl der gleichzeitig mit zusätzlichem Unterdruck versorgbaren Arbeitsstellen kann beispielsweise von, wie bislang üblich, etwa zehn Arbeitsstellen auf etwa zwanzig Arbeitsstellen erhöht werden, was nahezu zu einer Halbierung der bislang üblichen Hochlaufzeit der Textilmaschine führt.In an advantageous embodiment it is further provided that by temporarily lowering the spinning negative pressure during run-up to the sub-negative pressure, the number of workplaces that can be simultaneously supplied with additional negative pressure is increased from a somewhat low number to a significantly larger number. The number of jobs that can be supplied with additional negative pressure at the same time can for example be increased from about ten jobs to about twenty jobs, as has been customary up to now, which almost halves the start-up time of the textile machine that has hitherto been customary.

Die Anzahl der jeweils gleichzeitig mit zusätzlichem Unterdruck versorgbaren Arbeitsstellen ist dabei allerdings nicht nur vom eingestellten Sub-Unterdruck abhängig, sondern noch von weiteren, zum Teil recht unterschiedlichen Faktoren.The number of workplaces that can be supplied with additional negative pressure at the same time is not only dependent on the sub-negative pressure set, but also on other, in some cases quite different, factors.

Die Höchstanzahl der noch gleichzeitig mit zusätzlichem Unterdruck versorgbaren Arbeitsstellen hängt beispielsweise auch vom Material und der Materialstärke der auf den Arbeitsstellen zu fertigenden Spulen, dem Verschmutzungsgrad der Schmutzkammern der Saugluftanlage, der Aufstellhöhe der Textilmaschine und ähnlichen Parametern ab.The maximum number of workplaces that can be supplied with additional negative pressure at the same time also depends, for example, on the material and the material thickness of the bobbins to be produced on the workplaces, the degree of soiling of the dirt chambers of the suction air system, the installation height of the textile machine and similar parameters.

Gröbere und haarigere Garne fordern beispielsweise einen höheren Unterdruck, um ein Fadenende von einer Ablaufspule abzusaugen und das Fadenende in Vorbereitungsröhrchen der Arbeitsstellen für einen Fadenspleiß vorbereiten und spleißen zu können, als feine, glattere Garne. Das bedeutet, je geringer der Unterdruckbedarf einer einzelnen Arbeitsstelle ist, umso mehr Arbeitsstellen können gleichzeitig mit zusätzlichem Unterdruck versorgt werden. Da sich auch die Unterdruckverhältnisse in der Saugluftanlage einer Textilmaschine, beispielsweise aufgrund zunehmender Verschmutzung der Schmutzkammern, laufend ändern, wird außerdem das Druckniveau in der Saugluftanlage ständig überwacht und in einer Steuereinrichtung der Textilmaschine die Anzahl der jeweils noch gleichzeitig mit zusätzlichem Unterdruck versorgbaren Arbeitsstellen fortlaufend neu berechnet.Coarser and hairier yarns, for example, require a higher negative pressure than fine, smoother yarns in order to suck off a yarn end from a pay-off bobbin and to be able to prepare and splice the yarn end in preparation tubes for a yarn splice. This means that the lower the vacuum requirement of an individual work station, the more work stations can be supplied with additional underpressure at the same time. Since the vacuum conditions in the suction air system of a textile machine change continuously, for example due to increasing contamination of the dirt chambers, the pressure level in the suction air system is also constantly monitored and the number of workstations that can be supplied with additional vacuum at the same time is continuously recalculated in a control device of the textile machine .

Durch eine solche Vorgehensweise wird nicht nur sichergestellt, dass das Unterdruckniveau in der Saugluftanlage nicht unter den vorgegebenen, von den Arbeitsstellen temporär für den Betrieb notwendigen Sub-Unterdruck sinkt, sondern auch gewährleistet, dass alle Arbeitsstellen, die mit zusätzlichem Unterdruck versorgt werden, auch stets ausreichend Saugluft erhalten.Such a procedure not only ensures that the negative pressure level in the suction air system does not fall below the specified sub-negative pressure temporarily required by the workplaces for operation, but also ensures that all workplaces that are supplied with additional negative pressure also always get enough suction air.

Vorzugsweise ist die temporäre Absenkung des Niveaus des in der Saugluftanlage herrschenden Unterdruckes auf einen Sub-Unterdruck dabei definiert durch das Bedienpersonal einstellbar. Das heißt, durch eine solche, durch das Bedienpersonal initiierbare Absenkung des in der Saugluftanlage anstehenden Niveaus des Unterdruckes auf einen temporären Sub-Unterdruck kann im Bedarfsfall, speziell nach einem Maschinenstillstand, sofort so reagiert werden, dass die nachfolgende Produktionsaufnahme der Arbeitsstellen der Textilmaschine eine möglichst kurze Zeitspanne beansprucht.Preferably, the temporary lowering of the level of the negative pressure prevailing in the suction air system to a sub-negative pressure can be set by the operating personnel in a defined manner. This means that by lowering the level of the negative pressure in the suction air system to a temporary sub-negative pressure, which can be initiated by the operating personnel, if necessary, especially after a machine standstill, it is possible to react immediately in such a way that the subsequent production start of the workstations of the textile machine as much as possible demanded a short period of time.

Zur Lösung der Aufgabe wird außerdem eine Textilmaschine mit mehreren gleichartigen Arbeitsstellen, die jeweils einen Grundbedarf an Unterdruck für den regulären Produktionsbetrieb und zusätzlichen Unterdruckbedarf nach einer Produktionsunterbrechung an der Arbeitsstelle haben, und mit einer Saugluftanlage mit einer begrenzten Saugleistung zur Bereitstellung des Unterdrucks an den Arbeitsstellen vorgeschlagen. Es ist eine Steuereinrichtung vorhanden, der ein Mindest-Unterdruck vorgebbar ist und die Steuereinrichtung ist dazu ausgebildet, die Anzahl der gleichzeitig mit zusätzlichem Unterdruck versorgten Arbeitsstellen so zu begrenzen, dass der Mindest-Unterdruck nicht unterstritten wird. Erfindungsgemäß ist der Steuereinrichtung zusätzlich ein Sub-Unterdruck vorgebbar ist, der unter dem Mindest-Unterdruck liegt. Die Steuereinrichtung ist erfindungsgemäß dazu ausgebildet, bei einem vorgegebenen Ereignis temporär die Anzahl der gleichzeitig mit zusätzlichem Unterdruck versorgten Arbeitsstellen so zu begrenzen, dass der Sub-Unterdruck nicht unterstritten wird.To solve the problem, a textile machine with several similar work stations, each of which has a basic negative pressure requirement for regular production operations and an additional negative pressure requirement after an interruption in production at the work station, and with a suction air system with a limited suction power to provide the negative pressure at the work stations is also proposed . There is a control device that can predetermine a minimum negative pressure and the control device is designed to limit the number of workplaces simultaneously supplied with additional negative pressure so that the minimum negative pressure is not undershot. According to the invention, the control device can also be given a sub-negative pressure which is below the minimum negative pressure. According to the invention, the control device is designed to temporarily limit the number of workplaces simultaneously supplied with additional negative pressure in the event of a predetermined event so that the sub-negative pressure is not undershot.

Erfindungsgemäß kann der Bediener an der Steuereinrichtung also zwei Unterdrücke eingeben. Das sind zum einen der Mindest-Unterdruck, der von der Steuereinrichtung im regulären Produktionsbetrieb als untere Grenze verwendet wird, und zum anderen der Sub-Unterdruck, auf den der Unterdruck durch die Steuereinrichtung bei dem vorgebenden Ereignis abgesenkt wird.According to the invention, the operator can therefore enter two negative pressures on the control device. These are, on the one hand, the minimum negative pressure, which is used by the control device in regular production operation as the lower limit, and, on the other hand, the sub-negative pressure to which the negative pressure is lowered by the control device during the specified event.

Die erfindungsgemäße Textilmaschine mit ihrer Steuereinrichtung ist zur Durchführung des erfindungsgemäßen Verfahrens und seiner bevorzugten Ausführungsformen ausgebildet. Gemäß einer bevorzugten Ausführung ist in der Steuereinrichtung der Hochlauf der Textilmaschine nach einem Maschinenstillstand, bei dem alle Arbeitsstellen einen zusätzlichen Unterdruckbedarf haben, als Ereignis hinterlegt.The textile machine according to the invention with its control device is designed to carry out the method according to the invention and its preferred embodiments. According to a preferred embodiment, the start-up of the textile machine after a machine standstill, in which all workplaces have an additional vacuum requirement, is stored as an event in the control device.

In der Steuereinrichtung kann auch der Hochlauf einer Gruppe von Arbeitsstellen, die gleichzeitig einen zusätzlichen Unterdruckbedarf haben, als Ereignis hinterlegt sein.The start-up of a group of workstations that simultaneously have an additional vacuum requirement can also be stored as an event in the control device.

Bei dem der Steuereinrichtung vorgegebenen Ereignis wird vorzugsweise durch die temporäre Absenkung des Spinnunterdruckes die Anzahl der gleichzeitig mit zusätzlichem Unterdruck versorgbaren Arbeitsstellen von einer ersten Anzahl auf eine zweite Anzahl erhöht.In the event specified for the control device, the temporary lowering of the spinning vacuum preferably increases the number of work stations that can be simultaneously supplied with additional vacuum from a first number to a second number.

Das erfindungsgemäße Verfahren kommt vorzugsweise in Verbindung mit einer Offenend-Rotorspinnmaschine zur Anwendung und die erfindungsgemäße Textilmaschine ist vorzugsweise als Offenend-Rotorspinnmaschine ausgebildet. Der Produktionsbetrieb ist damit ein Spinnbetrieb. Nach der Produktionsunterbrechung, das heißt in diesem Fall einer Spinnunterbrechung, ist der zusätzliche Unterdruck für das Wiederanspinnen der Arbeitsstelle erforderlich. Der Unterdruck ist der Spinnunterdruck.The method according to the invention is preferably used in connection with an open-end rotor spinning machine and the textile machine according to the invention is preferably designed as an open-end rotor spinning machine. The production company is thus a spinning company. After the production interruption, that is to say in this case a spinning interruption, the additional negative pressure is required for the re-spinning of the job. The negative pressure is the spinning negative pressure.

Das erfindungsgemäße Verfahren wird nachfolgend anhand eines in der Zeichnung schematisch angedeuteten Ausführungsbeispiels näher erläutert. Im Ausführungsbeispiel wird von einer Offenend-Rotorspinnmaschine ausgegangen.The method according to the invention is explained in more detail below with the aid of an exemplary embodiment schematically indicated in the drawing. In the exemplary embodiment, an open-end rotor spinning machine is assumed.

Die Figur 1 zeigt anhand eines Diagramms durch eine Kurve 1 schematisch den Unterdruckverlauf p in der Saugluftanlage einer Textilmaschine.The Figure 1 shows, based on a diagram through a curve 1, the negative pressure profile p in the suction air system of a textile machine.

Die Kurve 1 zeigt dabei den Unterdruckverlauf p sowohl während eines regulären Spinnbetriebes als auch nach dem Wiederanlauf der Textilmaschine nach einem Partiewechsel oder einem unfreiwilligen Maschinenstillstand. Die Kurve 1 zeigt speziell das im Bereich der Arbeitsstellen einer Rotorspinnmaschine in den Rotorgehäusen der Offenendspinnvorrichtungen anliegende, vorgebbare Niveau des Spinnunterdruckes.Curve 1 shows the negative pressure profile p both during regular spinning operation and after restarting the textile machine after a lot change or an involuntary machine standstill. Curve 1 specifically shows the predeterminable level of the spinning vacuum that is present in the rotor housings of the open-end spinning devices in the area of the work stations of a rotor spinning machine.

Die Kurve 2 offenbart schematisch den Drehzahlverlauf des Antriebsmotors des Saugluftaggregates der Textilmaschine, das heißt, den Drehzahlverlauf des Antriebsmotors sowohl während eines regulären Spinnbetriebes, als auch nach dem Wiederanlauf der Textilmaschine nach einem Partiewechsel oder einem unfreiwilligen Maschinenstillstand.Curve 2 shows schematically the speed profile of the drive motor of the suction air unit of the textile machine, i.e. the speed profile of the drive motor both during regular spinning operation and after restarting the textile machine after a lot change or an involuntary machine standstill.

Mit Z1 bzw. Z2 ist außerdem jeweils graphisch die Anzahl der jeweils gleichzeitig mit zusätzlichem Unterdruck versorgbarer und damit wiederanspinnbarer Arbeitsstellen der Rotorspinnmaschine dargestellt.With Z 1 and Z 2 , the number of work stations of the rotor spinning machine that can be simultaneously supplied with additional negative pressure and thus re-spinnable is also shown graphically.

Z1 zeigt dabei die Anzahl der zusätzlich mit Unterdruck versorgbaren Arbeitsstellen, wenn die Arbeitsstellen mit einem Mindest-Spinnunterdruck pmin arbeiten. Z2 offenbart die Anzahl der zusätzlich mit Unterdruck versorgbaren Arbeitsstellen, wenn die Arbeitsstellen mit einem Sub-Spinnunterdruck psub betrieben werden.Z 1 shows the number of jobs that can additionally be supplied with negative pressure when the jobs work with a minimum spinning negative pressure p min . Z 2 reveals the number of jobs that can additionally be supplied with negative pressure when the jobs are operated with a sub-spinning negative pressure p sub .

Die Abszisse zeigt dabei den zeitlichen Verlauf des erfindungsgemäßen Verfahrens, wobei die verschiedenen, nachfolgend näher beschriebenen Zeitpunkte mit A, B, C etc. gekennzeichnet sind.The abscissa shows the course of the method according to the invention over time, the various points in time described in more detail below being identified by A, B, C, etc.

Auf der Ordinate ist das Niveau des in den Rotorgehäusen herrschenden Spinnunterdruckes mit p sowie das Drehzahlniveau des Antriebsmotors des Saugluftaggregates der Textilmaschine mit d.On the ordinate, the level of the spinning vacuum prevailing in the rotor housings is indicated by p and the speed level of the drive motor of the suction air unit of the textile machine is indicated by d.

Wie ersichtlich, läuft der Antriebsmotor des Saugluftaggregates der Offenend-Rotorspinnmaschine während des regulären Spinnbetriebes der Textilmaschine auf einem gegenüber seiner Maximaldrehzahl dmax. niedrigeren Drehzahl dist. Im Bereich der Rotorgehäuse der Offenend-Spinnvorrichtungen der Arbeitsstellen herrscht während dieser Zeit ein vorgebbarer Mindest-Spinnunterdruck pmin. Da alle Arbeitsstellen zunächst ordnungsgemäß laufen, beträgt die Anzahl der zu diesem Zeitpunkt gleichzeitig mit zusätzlichem Unterdruck zu versorgenden Arbeitsstellen 0.As can be seen, the drive motor of the suction air unit of the open-end rotor spinning machine runs during the regular spinning operation of the textile machine at a speed d max compared to its maximum speed. lower speed d is . In the area of the rotor housing of the open-end spinning devices of the work stations, a predeterminable minimum spinning vacuum p min prevails during this time. Since all workplaces are initially running properly, the number of workplaces to be supplied with additional negative pressure at the same time is 0.

Zum Zeitpunkt A kommt es zu zusätzlichen Saugluftanforderungen einer Anzahl von Arbeitsstellen, beispielsweise, weil es an den Arbeitsstellen zu Spinnunterbrechungen aufgrund von Fadenbrüchen gekommen ist und die Arbeitsstellen wieder neu anspinnen wollen.At time A there are additional suction air requirements from a number of work stations, for example because spinning interruptions have occurred at the work stations due to thread breaks and the work stations want to re-spin.

In einem solchen Fall sorgt die Steuereinrichtung der Textilmaschine dafür, dass der Antriebsmotor des Saugluftaggregates auf seine Maximaldrehzahl dmax. beschleunigt wird. Diese Maximaldrehzahl dmax. ist beispielsweise zum Zeitpunkt B erreicht.In such a case, the control device of the textile machine ensures that the drive motor of the suction air unit is set to its maximum speed d max . is accelerated. This maximum speed d max . is reached at time B, for example.

Aufgrund der Maximaldrehzahl dmax des Antriebsmotors des Saugluftaggregates würde das Niveau des Spinnunterdruckes in der Saugluftanlage, wenn zum Zeitpunkt B kein zusätzlicher Unterdruckbedarf durch die vorgenannten, wieder neu anzuspinnenden Arbeitsstellen vorläge, wie durch die gestrichelte Linie 1' angedeutet, auf einen Maximal-Spinnunterdruck pmax. ansteigen, der deutlich über dem Mindest-Spinnunterdruck pmin. läge.Due to the maximum speed d max of the drive motor of the suction air unit, the level of the spinning negative pressure in the suction air system would be if at time B there was no additional negative pressure requirement due to the aforementioned workplaces to be re-spun, as indicated by the dashed line 1 ', to a maximum spinning vacuum p max . increase, which is well above the minimum spinning vacuum p min . would be.

Allerdings hat die Steuerung der Textilmaschine gleichzeitig aus der Differenz zwischen dem Maximal-Spinnunterdruck pmax. und dem Mindest-Spinnunterdruck pmin. sowie dem zusätzlichen Unterdruckverbrauch einer einzelnen Arbeitsstelle die Anzahl Z1 von Arbeitsstellen berechnet, die ab dem Zeitpunkt B gleichzeitig mit zusätzlichem Unterdruck versorgt, das heißt, gleichzeitig wieder neu angesponnen werden können, ohne dass dabei der Spinnunterdruck in der Saugluftanlage unter den Mindest-Spinnunterdruck pmin. absinkt, das heißt, trotz der Versorgung einer Anzahl Z1 von Arbeitsstellen mit zusätzlichem Unterdruck bleibt der Spinnunterdruck in der Saugluftanlage auf einem Mindest-Spinnunterdruck pmin.However, the control of the textile machine has at the same time derived from the difference between the maximum spinning vacuum p max . and the minimum spinning vacuum p min . as well as the additional negative pressure consumption of an individual job, the number Z 1 of jobs is calculated that from time B is simultaneously supplied with additional negative pressure, that is, can be spun again at the same time without the spinning negative pressure in the suction air system falling below the minimum spinning negative pressure p min . drops, that is, despite the supply of a number Z 1 of work stations with additional negative pressure, the spinning negative pressure in the suction air system remains at a minimum spinning negative pressure p min .

Wenn zum Beispiel zum Zeitpunkt C das Wiederanspinnen der Anzahl Z1 von Arbeitsstellen abgeschlossen ist, wird die Maximaldrehzahl dmax des Antriebsmotors des Saugluftaggregates wieder auf die Drehzahl dist zurückgenommen, was zum Zeitpunkt D geschehen ist. Das Niveau des Spinnunterdruckes in der Saugluftanlage bleibt dabei auf einem Mindest-Spinnunterdruck Pmin.If, for example, the re-spinning of the number Z 1 of jobs has been completed at time C, the maximum speed d max of the drive motor of the suction air unit is again reduced to speed d ist , which happened at time D. The level of the spinning negative pressure in the suction air system remains at a minimum spinning negative pressure Pmin.

Mit E ist der Zeitpunkt dargestellt, zu dem es zu einer größeren Betriebsstörung kommt. Das heißt, zum Zeitpunkt E schaltet sich die Rotorspinnmaschine, beispielsweise aufgrund einer Störung in den Stromversorgungseinrichtungen, ab und läuft in den Stillstand aus, was zum Zeitpunkt F geschehen ist. Zum Zeitpunkt F beträgt die Drehzahl des Antriebsmotors do und entsprechend beträgt der Spinnunterdruck in der Saugluftanlage p0.The point in time at which a major malfunction occurs is shown with E. That is, at time E, the rotor spinning machine switches off, for example due to a fault in the power supply devices, and comes to a standstill, which happened at time F. At time F, the speed of the drive motor is do and the spinning vacuum in the suction air system is correspondingly p 0 .

Da ein solcher Maschinenstillstand an allen Arbeitsstellen der Textilmaschine zu Spinnunterbrechungen führt, müssen nach Beendigung des Maschinenstillstandes alle Arbeitsstellen der Rotorspinnmaschine wieder neu angesponnen werden.Since such a machine standstill leads to spinning interruptions at all workplaces of the textile machine, all workplaces of the rotor spinning machine have to be spun again after the end of the machine standstill.

Da bekanntlich die Maschinenlaufzeit einer Textilmaschine für den Gesamtwirkungsgrad einer Maschine mitentscheidend ist, ist es vorteilhaft, wenn nach einem Maschinenstillstand alle Arbeitsstellen einer betroffenen Textilmaschine möglichst schnell wieder in Betrieb genommen werden. Um die Hochlaufzeit der Textilmaschine möglichst kurz zu halten, sollten daher möglichst viele Arbeitsstellen gleichzeitig wieder angesponnen werden, das heißt, gleichzeitig mit zusätzlichem Unterduck versorgt werden können.Since, as is well known, the machine running time of a textile machine is one of the decisive factors for the overall efficiency of a machine, it is advantageous if all workstations of an affected textile machine are put back into operation as quickly as possible after a machine standstill. In order to keep the start-up time of the textile machine as short as possible, as many jobs as possible should be spun again at the same time, that is, it should be possible to supply additional vacuum at the same time.

Zu diesem Zweck stellt das Bedienpersonal an der Steuerung der Textilmaschine einen Sub-Spinnunterdruck psub ein. Das heißt, beim Hochfahren der Offenend-Rotorspinnmaschine herrscht im Bereich der Saugluftanlage der Textilmaschine temporär ein Sub-Spinnunterdruck psub, der unter dem während des regulären Spinnbetriebes der Rotorspinnmaschine üblichen Mindest-Spinnunterdruck pmin. liegt.For this purpose, the operating personnel sets a sub-spinning vacuum p sub on the control of the textile machine. That means when starting up the open-end rotor spinning machine there is temporarily a sub-spinning negative pressure p sub in the area of the suction air system of the textile machine , which is below the minimum spinning negative pressure p min which is usual during regular spinning operation of the rotor spinning machine. lies.

Der Neustart der Rotorspinnmaschine erfolgt zum Zeitpunkt G. Da zum Zeitpunkt G sofort eine Vielzahl von zusätzlichen Saugluftanforderungen von Arbeitsstellen vorliegen, die nach dem Störfall alle sofort wieder anspinnen wollen, sorgt die Steuereinrichtung der Textilmaschine sofort dafür, dass der Antriebsmotor des Saugluftaggregates auf seine Maximaldrehzahl dmax. beschleunigt, die zum Zeitpunkt H erreicht wird. Das bedeutet, wenn kein zusätzlicher Unterdruckbedarf durch Arbeitsstellen, die anspinnen wollen, vorläge, würde in der Saugluftanlage der Textilmaschine jetzt, wie durch die gestrichelte Kurve 1' angedeutet, ein Maximal-Spinnunterdruck pmax. herrschen. Allerdings wurde in der Steuereinrichtung der Textilmaschine gleichzeitig aus der Differenz zwischen dem eingestellten Sub-Spinnunterdruck psub und dem Maximal-Spinnunterdruck pmax. sowie dem jeweiligen zusätzlichen Unterdruckverbrauch einer einzelnen Arbeitsstelle die Anzahl Z2 von Arbeitsstellen berechnet, die während des Hochlaufes der Textilmaschine gleichzeitig mit zusätzlicher Saugluft versorgt werden können, ohne dass die Gefahr besteht, dass der Unterdruck in der Saugluftanlage der Textilmaschine unter den vorgegebenen Sub-Spinnunterdruck psub sinkt.The rotor spinning machine is restarted at time G. Since at time G there are a large number of additional suction air requests from workplaces that all want to spin again immediately after the incident, the control device of the textile machine immediately ensures that the drive motor of the suction air unit is set to its maximum speed d max . accelerated, which is reached at time H. This means that if there were no additional negative pressure requirement from jobs that want to piecing, a maximum spinning negative pressure p max would now be in the suction air system of the textile machine, as indicated by the dashed curve 1 '. to rule. However, in the control device of the textile machine, the difference between the set sub-spinning negative pressure p sub and the maximum spinning negative pressure p max . as well as the respective additional negative pressure consumption of an individual work station, the number Z 2 of work stations is calculated that can be simultaneously supplied with additional suction air while the textile machine is running without the risk of the negative pressure in the suction air system of the textile machine falling below the specified sub-spinning negative pressure p sub decreases.

Vom Zeitpunkt H an wird fortlaufend jeweils eine maximal mögliche Anzahl Z2 von Arbeitsstellen gleichzeitig mit zusätzlicher Saugluft versorgt, wobei, wie vorstehend erläutert, sichergestellt wird, dass der Unterdruck in der Saugluftanlage nicht unter das Sub-Spinnunterdruckniveau psub absinkt. Nach einer bestimmten Zeit, die durch den Zeitpunkt I gekennzeichnet ist, sind alle Arbeitsstellen der Textilmaschine wieder neu angesponnen, das heißt, es liegt kein zusätzlicher Unterdruckbedarf durch Arbeitsstellen mehr vor. Das heißt, zum Zeitpunkt I ist eine Situation gegeben, in der das Saugluftangebot des Saugluftaggregates aufgrund des mit Maximaldrehzahl dmax. rotierenden Antriebsmotor die Saugluftnachfrage übersteigt. Zum Zeitpunkt I wird daher begonnen, die Drehzahl dmax. des Antriebsmotors des Saugluftaggregates zurückzunehmen, die dann zum Zeitpunkt K wieder das Drehzahlniveau dist aufweist. Gleichzeitig wird durch die Steuerung der Textilmaschine der in der Saugluftanlage der Textilmaschine eingestellte Spinnunterdruck korrigiert. Das heißt, der temporär beim Hochfahren der Offenend-Rotorspinnmaschine eingestellte Sub-Spinnunterdruck psub wird wieder auf den während des regulären Spinnbetriebes der Rotorspinnmaschine üblichen Mindest-Spinnunterdruck pmin. angehoben.From time H on, a maximum possible number Z 2 of work stations is continuously supplied with additional suction air at the same time, whereby, as explained above, it is ensured that the negative pressure in the suction air system does not drop below the sub-spinning negative pressure level p sub . After a certain time, which is characterized by the point in time I, all workstations of the textile machine are spun again, that is, there is no longer any additional negative pressure requirement due to workstations. That is, at time I there is a situation in which the suction air supply of the suction air unit due to the maximum speed d max . rotating drive motor exceeds the suction air demand. At the point in time I, the speed d max is therefore started. of the drive motor of the suction air unit, which then has the speed level d ist again at time K. At the same time, the control of the textile machine corrects the negative spinning pressure set in the suction air system of the textile machine. This means that the sub-spinning negative pressure p sub temporarily set when the open-end rotor spinning machine is started up is again reduced to the minimum spinning negative pressure p min which is usual during regular spinning operation of the rotor spinning machine. raised.

BezugszeichenlisteList of reference symbols

Kurve 1Curve 1
Verlauf des Unterdruckniveaus in der SaugluftanlageCourse of the negative pressure level in the suction air system
Kurve 1'Curve 1 '
Verlauf des Unterdruckniveaus bei pmax ohne zusätzliche DruckluftverbraucherCourse of the negative pressure level at p max without additional compressed air consumers
Kurve 2Curve 2
Verlauf der Motordrehzahl des SaugluftaggregatesCourse of the engine speed of the suction air unit
AA.
Zeitpunkttime
BB.
Zeitpunkttime
CC.
Zeitpunkttime
DD.
Zeitpunkttime
EE.
Zeitpunkttime
FF.
Zeitpunkttime
GG
Zeitpunkttime
HH
Zeitpunkttime
II.
Zeitpunkttime
KK
Zeitpunkttime
p0p0
Unterdruck bei stillstehendem SaugluftaggregatNegative pressure when the suction air unit is at a standstill
psubpsub
Sub-SpinnunterdruckSub-spin vacuum
pminpmin
Mindest-SpinnunterdruckMinimum spinning vacuum
pmaxpmax
Maximal-SpinnunterdruckMaximum spinning vacuum
d0d0
Drehzahl des Motors bei stillstehendem SaugluftaggregatSpeed of the motor with the suction air unit at a standstill
distdist
Ist- Drehzahl des MotorsActual speed of the motor
dmaxdmax
Maximal- Drehzahl des MotorsMaximum speed of the motor
Z1Z1
Anzahl der zusätzlichen Arbeitsstellen bei pmin Number of additional jobs at p min
Z2Z2
Anzahl der zusätzlichen Arbeitsstellen bei psub Number of additional jobs at p sub

Claims (8)

  1. Method for operating a textile machine with several identical workstations which each have a basic requirement for negative pressure for regular production operation and an additional requirement for negative pressure following an interruption to production at the workstation, and with a vacuum system with limited suction force to exert the negative pressure at the workstations,
    whereby a minimum negative pressure (pmin) is specified and
    whereby the number of workstations to be simultaneously supplied with additional negative pressure is limited so that the minimum negative pressure (pmin) is always met, characterised in that
    a sub-negative pressure (psub) is specified which is below the minimum negative pressure (pmin) and
    if a specified event occurs, the number of workstations simultaneously supplied with additional negative pressure is temporarily limited so that the sub-negative pressure (psub) is always met.
  2. Method according to claim 1, characterised in that the event is the start-up of the textile machine following a machine stoppage, during which all workstations have an additional requirement for negative pressure.
  3. Method according to claim 1, characterised in that the event is the start-up of a group of workstations that simultaneously have an additional requirement for negative pressure.
  4. Method according to one of the previous claims, characterised in that if the specified event occurs, the number of workstations that can be simultaneously supplied with additional negative pressure is increased from a first number (Z1) to a second number (Z2) by the temporary reduction of the negative spinning pressure.
  5. Textile machine with several identical workstations which each have a basic requirement for negative pressure for regular production operation and an additional requirement for negative pressure following an interruption to production at the workstation, and with a vacuum system with limited suction force to exert the negative pressure at the workstations,
    whereby a control unit is present which can be used to specify a minimum negative pressure (pmin), and the control unit is designed so that the number of workstations simultaneously supplied with additional negative pressure is limited so that the minimum negative pressure (pmin) is always met,
    characterised in that
    the control unit can also be used to specify a sub-negative pressure (psub) which is below the minimum negative pressure (pmin) and
    the control unit is designed so that if a specified event occurs, the number of workstations simultaneously supplied with additional negative pressure is temporarily limited so that the sub-negative pressure (psub) is always met.
  6. Textile machine according to claim 5, characterised in that the start-up of the textile machine following a machine stoppage during which all workstations have an additional requirement for negative pressure is stored as an event in the control unit.
  7. Textile machine according to claim 5, characterised in that the start-up of a group of workstations that simultaneously have an additional requirement for negative pressure is stored as an event in the control unit.
  8. Textile machine according to one of claims 5 to 7, characterised in that if the event specified in the control unit occurs, the number of workstations that can be simultaneously supplied with additional negative pressure is increased from a first number (Z1) to a second number (Z2) by the temporary reduction of the negative spinning pressure.
EP19154516.9A 2018-01-31 2019-01-30 Method for operating a textile machine and textile machine Active EP3533739B1 (en)

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US20190233980A1 (en) 2019-08-01
US11066271B2 (en) 2021-07-20

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