EP3070038B1 - Method, device and computer program for allocation of vacuum air to vacuum air requesting work stations of a textile machine - Google Patents

Description

The invention relates to a method for allocating suction air provided by a suction air system of a textile machine to suction jobs of the textile machine. However, the invention also relates to a device, a controller and a computer program for carrying out at least parts of this method.

Textile machines such as e.g. Automatic winder and spinning machines consist of a large number of similar jobs that u.a. for their various work organs at least temporarily need suction, which is usually provided by one or more Saugluftanlagen the textile machine available, wherein below without limitation of generality for the sake of simplicity is always spoken of only a single Saugluftanlage.

For example, winder machines typically include e.g. via a thread catching and cleaning nozzle, which on the one hand causes a cleaning of loose particles during the winding process and on the other hand exercises the security function to catch the lower thread at certain yarn breaks. The thread-catching and cleaning nozzle is thus continuously supplied with suction air, at least during the regular winding operation. Likewise, e.g. the rotor cup of an open-end spinning machine during the regular spinning operation, but also during the piecing process, continuously supplied with suction air. But even these work organs require at least during a shutdown of the workplace, e.g. due to a recoverable only by intervention of the operator disturbance no suction.

Other working bodies of the workstations, on the other hand, only come into action from time to time and for a relatively short time and therefore only need suction air. For example, the suction nozzles of winding and spinning machines only for receiving the upper thread from the package in case of yarn breakage or a change of the supply medium (Kops- or spinning can change) or a change of the package are required.

For the quality of the products produced by the textile machine, e.g. the packages and the wound on them threads, it is important that the working organs of the suction pressure when needed in each case is available in sufficient strength, which is then present at the work organs vacuum so in a predetermined range. Furthermore, it maximizes the productivity of the machine, if the required suction air is provided as soon as possible after an appropriate request, since the working body otherwise has to spend an unproductive waiting time. On the other hand, the interpretation of the Saugluftanlage increased to the maximum possible Saugluftbedarf out their costs inappropriately. Similarly, maintaining a suction air level above the level just required increases the energy consumption and thus the maintenance cost of the machine.

Therefore, it has prevailed in the prior art, for a certain waiting times to accept suction air at least in extreme situations, and regulate the other hand, the Saugluftstärke the Saugluftanlage as accurately as possible to the required Saugluftbedarf. But since, above all, due to the length of the suction air ducts in the textile machine, a regulation of the suction air is relatively sluggish, the required suction air strength can often not be met with purely tracking regulations.

Therefore, for example, in the DE19511960A1 proposed that a working organ should register his suction before, so submit a Saugluftanforderung, whereupon the Saugstärkenregelung in time before polling this suction sufficiently increases the suction to even after allotment of Saugluftanforderung, so release the suction to this request, a sufficient suction for to maintain all affiliated working bodies. For this purpose, the determined via an inverter speed of the suction unit is increased accordingly in practice, which leads to an increased power consumption of the same. Upon reaching the maximum allowable current consumption further Saugluftanforderungen are no longer allocated, but the requesting work organ put in waiting position. Waiting work organs are only operated again when the power consumption of the suction unit has dropped sufficiently by processing previous Saugluftanforderungen.

The DE102006050220A1 has the solution of the just discussed DE19511960A1 then expanded for a priority-driven queue. Concerning. productivity Critical Saugluftanforderungen is given a higher priority than uncritical and waiting in the queue on suction jobs vacuum is allocated primarily according to their priority and secondarily then, for example, according to the order of their request input. In particular, the waiting times of scarce resources such as the responsible for several jobs operating units and operating personnel can be shortened.

The DE102006050220A1 manages the suction air requirements of the work organization at the workstation level. Specifically, it allows a maximum of Saugluftzuteilungen to a certain number of jobs. If this maximum number is reached, suction air requirements of further jobs are put into the queue. Suction air can not be allocated to a waiting workstation until one of the workplaces just supplied has finished its work for which it had requested the suction air, ie the workstation announces the termination of its previous intake air requirement.

Against this background, it is an object of the present invention to propose a more efficient allocation of suction air provided by the suction air system of the textile machine on suction air requesting jobs of the textile machine, which allows, compared to the prior art more working organs and preferably more jobs simultaneously with suction supply.

• dass die Saugluftanforderungen eine Information über den planmäßigen Verlauf ihres Saugluftbedarfs enthalten, und
• dass die Beurteilung, ob die Zuteilung einer Saugluftanforderung eine Überschreitung der Maximalkapazität der Saugluftanlage erwarten lässt, den planmäßigen Verlauf des Saugluftbedarfs dieser Saugluftanforderung sowie der zum Zeitpunkt der Beurteilung bereits zugeteilten Saugluftanforderungen berücksichtigt.

This object is achieved on the one hand by a method for allocating provided by a Saugluftanlage a textile machine suction on suction air requesting jobs of the textile machine, Saugluftanforderungen whose allocation would be expected to exceed a maximum capacity of Saugluftanlage be set in a queue and being in the queue waiting Saugluftanforderungen be allocated only if their allocation can expect no exceeding of the maximum capacity of the Saugluftanlage more, characterized

• that the Saugluftanforderungen contain information about the scheduled course of their Saugluftbedarfs, and
• that the assessment of whether the allocation of a suction air requirement can be expected to exceed the maximum capacity of the suction air system, the scheduled Course of Saugluftbedarfs this Saugluftanforderung and taken into account at the time of the assessment Saugluftanforderungen.

However, the object is also achieved by a device for carrying out this method, characterized in that the device comprises one or more controls, which are provided for generating or for receiving and the method further processing of Saugluftanforderungen the jobs of the textile machine.

To solve the task so u.a. Each of the controls just mentioned, which can be designed in particular as a program-controlled and otherwise known in the art controls, the invention is then in the control programs controlling computer programs.

All of these solutions and solution components are therefore part of the scope of the invention.

The inventors have realized that it is not important for the decision as to whether a suction air requirement can still be operated within the maximum capacity of the suction air system, how many work stations have just been assigned suction air. Because the suction air requirement of a job varies greatly depending on which process the job is currently working on. However, it should be noted that the suction air requirement can change and even increase during the execution of a process. Therefore, it must be ensured during the intake air allocation that sufficient suction air is available throughout the process in order to be able to process the process completely. Because otherwise the process would have to be stopped in the middle because of Saugluftmangel and then be completely repeated, which would lead to delays and duplication.

Thus, there is a process in the open-end spinning machine, for example in the re-piecing after thread breakage. For this purpose, the suction nozzle must first locate the upper thread on the package and insert it into the withdrawal tube projecting into the spinning rotor and the overlying removal rollers of the yarn removal device. After that, the suction nozzle is no longer needed, but the storage nozzle, which is the initial during run-up compensates for the speed differences between the initially faster take-off rollers and the package by pneumatically drawing in excess yarn in a loop of thread. At the end of the run-up, the speeds of the take-off rolls and the take-up reel have become equal and the thread loop has been pulled out of the storage nozzle by the now faster running take-up reel, which also no longer requires suction air and the piecing process is completed.

The invention thus provides that a workstation does not simply request suction air in the sense of a digital request or not, but rather qualifies its suction air requirement with regard to the planned course of its suction air requirement. It is therefore necessary to plan in advance how the demand for suction air will develop during the execution of the process that requires the suction air. In this case, the information about the scheduled course of Saugluftbedarfs e.g. consist only of the indication of the maximum required during the process to be processed Saugluftbedarfs. In the case of the o.g. Piecing process requires e.g. The suction nozzle about four times as much suction as the storage nozzle, so that the maximum demand here occurs right at the beginning and the further need decreases after switching off the suction nozzle to about a quarter.

The entity that decides on the allocation of a suction air request then uses the information about the suction air requirement to judge whether the suction air system can service this suction air requirement in addition to the already allocated within its maximum capacity. In the event that the information about the scheduled course of the suction air requirement only consists of the planned maximum requirement, this assessment consists e.g. It is to add the maximum demand of the new Saugluftanforderung to the sum of the maximum demand of the already-operated Saugluftanforderungen, and allot the Saugluftanforderung only when the total sum is still within the maximum capacity of the Saugluftanlage.

However, more qualified information about the suction requirement also belongs to the scope of the invention. It is thus also possible, for example, to specify this information in detail as a suction air requirement over the process time, that is to specify in detail already at the first suction air request, in which period from the allocation onwards which intake air requirement prevails and in particular when the process will be ended. With From such a detailed demand forecast, the decision-making authority can then very differentiated plan which Saugluftanforderungen within the maximum capacity of the Saugluftanlage can be allocated in parallel. In particular, in addition to a priority and input order of the suction air requirements, this instance can then also take into account which allocation order would lead to an overall optimum productivity of the textile machine.

The information about the scheduled course of the suction air requirement of a Saugluftanforderung can be coded in this case in a suitable manner. So it is e.g. It is also possible to deposit the scheduled course of the suction air requirement of the individual processes in one or more central or also distributed in decentralized memories, which can be accessed by the Saugluftzutilinstanz. Then it suffices to say in the suction air request the requesting process e.g. identified by a short code and the arbitration instance then retrieves the scheduled course of the suction air requirement of this process from the corresponding memory.

As a borderline case but also belongs to the invention that a Saugluftanforderung the planned course of their intake air requirement only indicates that it only tells the Saugluftbedarf the first step in processing the process in action working organ. If this working organ has the highest suction air requirement occurring during the course of the process, ie the maximum suction air requirement of the process initially exists, this message coincides with the specification of the maximum requirement already mentioned above. Otherwise, however, an increase in the suction air requirement during the process in this embodiment of the invention can lead to an exceeding of the maximum capacity of the suction air system, as can happen even in the case of unscheduled events, see FIG. their discussion below. However, this can be taken into account depending on the application and in particular for small or short-term excesses and is part of the scope of the invention.

It follows from the above-described procedure that the allocation of Saugluftanforderungen is not limited to a predetermined number of simultaneously assigned jobs, but that it depends on the differentiated Saugluftbedarf the active work processes. If, for example, two assigned piecing processes are already in the phase where only the storage nozzle is active, they have in common only the half Saugluftbedarf that needs a fresh-spinning job due to their Saugdüsenaktivität. The allocation instance can now evaluate the jobs of these two advanced piecing processes instead of the factor 2 by a factor of ½ compared to a freshly spinning job and use them as freely recognized 3/2 eg for allocating the suction air requirement of a freshly piecing job. As a result, the object of the invention is achieved, more involved in the work processes working organs and in the case of Anspinnprozesses also more spinning jobs at the same time to supply with suction than was possible in the prior art.

At this point it should be inserted that was previously and also in the following simplifying always spoken of a Saugluftanforderung a job of the textile machine or is. This way of speaking takes into account that textile machines which are customary today have a workstation control system which coordinates the working bodies of the workstation. All the workstation related control operations with respect to the suction air thus usually run on such a workstation control.

However, it will be apparent to those skilled in the art that the invention is concerned with the allocation of aspirating air requirements, each of which is triggered by a cohesive work process, eg, from the aforementioned. Piecing. Ultimately, it's about generating suction air requirements for such processes and deciding on their allocation. Which instances control these processes, generate their Saugluftanforderungen, then accept these requirements and continue to process them up to the allocation, and which instances then process the processes themselves eventually and the changes in the Saugluftbedarfs possibly weiterermelden, there are many possibilities for the skilled person. Thus, even though the workstation controls and the central control of the textile machine are a preferred choice for these instances in the presently popular textile machines, the invention is not limited thereto.

Since the assessment of whether an intake air requirement that has not yet been allocated can still be operated depends on how much intake air the already assigned suction air requirements will still require, it always makes sense to always have an up-to-date overview of the currently serviced suction air requirements. Because while processing a It will usually happen that the suction air requirement changes during the process. Thus, in the example of the piecing process already given above, the suction air requirement at the transition from the operation of the suction nozzle to that of the storage nozzle drops to approximately one quarter of the initially required requirement.

Such a change in Saugluftbedarfes can thus already occur in its scheduled course. Of course, if the demand information given with the suction air request was sufficiently detailed, then the arbitration instance can take this into account during the entire process execution time. However, if the demand information contained only the maximum requirement, it makes sense to inform the arbitration instance of each decrease in the maximum demand still planned for the remainder of the process execution. This is all the more true in unplanned events; because these can not be foreseen in even the most detailed information about the scheduled course of Saugluftbedarfs.

Therefore, the invention provides in a development that, in the course of processing an assigned Saugluftanforderung entering their requesting job change the scheduled course of Saugluftbedarfs is used to update the Saugluftanforderung, which updated Saugluftanforderung then the further assessment whether new Saugluftanforderungen be allocated can, is based. So, for example, the workstation control, which controls the processing of the process supplied with suction air, any completion of a partial activity, whether planned or unscheduled, e.g. in an error situation, monitor and report any change in the further intake air demand caused thereby for the future to the metering instance. In the simplest case, this happens e.g. by reporting the changed maximum suction air requirement still required for the subsequent process execution.

In the case of a detailed requirement information in the example of Anspinnprozesses such an update is necessary, for example, if the upper thread could not be included within the planned time of the package and therefore now a new recording attempt to be made, which still requires strong suction. Because without such an update, the granting authority would assume that that the suction nozzle no longer works, but now the storage nozzle comes into action and requires only a quarter of the original suction air. In the case of the allocation of a further intake air requirement, it could thus come to an exceeding of the maximum capacity of the suction air system. By timely updating the Saugluftanforderung the piecing job that the high suction air demand continues to exist, such a misjudgment is avoided.

To be able to compare the suction air requirements of the suction air requirements and the still free capacity of the suction air system as simply as possible, the invention proposes in a special embodiment to express the suction air requirement and the maximum capacity of the suction air system in volume flow units. These volume flow units, abbreviated VSE, are a dimensionless variable whose numerical values are selected in a size which is favorable for practical handling. In the example of the piecing process, the suction nozzle requires e.g. 80 VSE, while the storage nozzle only requires 20 VSE. The suction air system of a specific type of textile machine can be used as a maximum capacity depending on the level of expansion, e.g. 600 or 1200 VSE.

A limiting situation of the method according to the invention results when the suction air requirement of an already assigned intake air requirement exceeds its original scheduled course as a result of an unscheduled event. In the case of a detailed Saugluftbedarfsinformation this has already been discussed above, if due to a repetition of the attempt of Oberfadenaufnahme on the package higher suction demand of 80 VSE, for example, longer than planned, while the metering authority in anticipation of the released 60 VSE forgive these already anticipating other Saugluftanforderungen Has. But even in the case of information only about the maximum planned requirement such situations may occur. Thus, during the piecing process during run-up, the thread may break again or the piecing of the thread inserted into the withdrawal tube may already fail at the fiber ring located in the rotor cup. In all these cases, the suction nozzle must be put back into operation and the Saugluftbedarf the piecing process increases by this unscheduled event again from 20 to 80 VSE. To solve this situation, the invention proposes two variants.

On the one hand, the allocation of Saugluftanforderung can be maintained in any case, even if it exceeds the maximum capacity of the Saugluftanlage is exceeded. Because such an excess will usually be of relatively short duration and relatively small extent, so that the decrease in Saugluftstärke in the Saugluftanlage will have little effect on the quality of the manufactured products of the textile machine. On the other hand, the continuation of a once started process typically has a positive effect on the productivity of the textile machine, since restarting a process normally causes considerable delays and in some cases it also necessitates repeating otherwise already successfully executed subprocesses.

For some textile machines, however, this process may lead to unacceptable quality losses. Therefore, the invention provides in the alternative variant, in a caused by an unscheduled event exceeding the original scheduled course of Saugluftbedarfs already assigned Saugluftanforderung this allocation to revoke, if otherwise the maximum capacity of the Saugluftanlage would be exceeded. If a continuation of this work process with unscheduled high intake air demand would therefore lead to exceeding the maximum capacity of the suction air system, the work process would be aborted and he would have to direct his suction request again to the arbitration instance to start again after allotment.

In addition, however, other alternatives can be provided if this leads in the specific case to a higher productivity of the textile machine. For example, for some of the work processes already allocated, their intake air supply can be quickly reduced without difficulty, or even completely prevented, even for a certain period of time, in order to create enough free capacity for the increased suction air requirement of the unplanned work process. After processing the unscheduled increased demand then these reduced Saugluftanforderungen can be fully absorbed again. An example of such a temporary ligation is the piecing process at its beginning when the suction nozzle is still in the vicinity of the package. Then, the suction air can be completely stopped and, while the suction nozzle waiting for action in its receiving position on suction, the thread end remains on the package. After resuming the suction air supply the recording process is resumed without further loss of time, since the suction nozzle is still in thread take-up position. Another point in the Anspinnprozessenden holding point at which the Saugluftversorgung can be interrupted without additional loss of time, between the end of Saugluftversorgung the suction nozzle and the beginning of the same for the storage nozzle, since the thread is securely held there in the take-off rollers and the exhaust pipe.

As already suggested in the meantime, the invention can also be used with the primarily priority-controlled queue of the initially mentioned type DE102006050220A1 be combined. In other words, when the suction air capacity is released, the priority of the suction air requirements can be taken into account for the decision as to which of the suction air requirements that have not yet been assigned, and in particular be used as the first decision criterion. Thus, for example, in the queue, the suction air requirements of the highest priority class can be allocated first, and if an allocation is not possible for all of these suction air requirements, these are assigned secondarily, for example, in the order of their receipt.

As already mentioned, the invention would be based on the z.Z. widespread textile machines preferred realized that the generation of Saugluftanforderungen the workstations controls would leave, which they would also send to the central control of the textile machine, after which the central control take over the further processing to the allocation. Advantageously, the invention proposes to use the programmability of these controllers and to realize the invention in corresponding computer programs for these controllers.

Instead of using a central control, however, the scope of the invention also includes the realization, for example, in a purely distributed control network. Thus, in principle, the use of the workstations controls, which inform each other about their Saugluftbedarf and agree by negotiation by the inventive method, which Saugluftanforderungen are ripened ready. But even the job center controls are not a must, but in extreme cases, the intelligence can even be located directly at the individual work organs. On the other hand, there are certain bundling because of the context within a process and also certain centralizations because of the allocation of the central resource the suction system certainly makes sense. If several suction air systems are used in a larger textile machine, these central intelligences could also be duplicated per suction air system and bundled together with their control system.

Fig. 1

schematisch eine Vorderansicht einer Textilmaschine, hier einer Offenendspinnmaschine, an der das erfindungsgemäße Verfahren zur Anwendung kommt;

Fig. 2

in perspektivischer Ansicht eine Arbeitsstelle, also Spinnstelle, der Offenendspinnmaschine aus Figur 1;

Fig. 3

schematisch den Aufbau dreier CAN-Telegramme für Saugluftanforderungen und -aktualisierungen;

Fig. 4

eine mögliche Abfolge von Saugluftanforderungen, ihrer Zuteilungen bzw. Verweigerungen und den jeweiligen Zustand der Warteschlange;

wobei dieselben Bauteile in allen Figuren mit denselben Bezugszeichen bezeichnet sind.The invention will be explained in more detail below with reference to an embodiment shown in the drawings and some of its variants. Show it

Fig. 1

schematically a front view of a textile machine, here an open-end spinning machine, to which the inventive method is used;

Fig. 2

in perspective view of a job, ie spinning station, the open-end spinning machine FIG. 1 ;

Fig. 3

schematically the structure of three CAN telegrams for Saugluftanforderungen and updates;

Fig. 4

a possible sequence of suction air requests, their grants and the respective state of the queue;

wherein the same components in all figures are denoted by the same reference numerals.

In the essence of the DE102006050220A1 taken and also numbered there as 1 and 2 figures is on the one hand in FIG. 1 schematically a front view of an entire textile machine, more specifically an open-end spinning machine, and in FIG. 2 in a perspective view one of their jobs, so one of their spinning stations represented. The invention implemented in computer programs, for example, can be used on the workstation controls and the central control of this textile machine.

Since open-end spinning machines and their jobs are well known in the art and their operation in the DE102006050220A1 in detail read is the description of the limited FIGS. 1 and 2 to a listing of their reference signs and the reference to deviations from DE102006050220A1 ,

FIG. 1 shows an open-end rotor spinning machine 5 with their jobs 1; End frames 31 and 32; as a cleaning and changer car 7 trained operating unit; Central control unit 10; Suction unit 20 with vacuum source 30, whose electric motor drive 29 and more precisely whose inverter is controlled via a control line 33 from the central control unit 10; as well as with CAN bus 28 to connect the (in Fig. 1 not designated) control devices 25 of the jobs. 1

FIG. 2 shows next to some already in FIG. 1 mentioned components a spinning station 1 with open-end spinning device 2; Yarn draw-off tube 21; Anspinnorgan 16; Thread monitor 26; Thread withdrawal device 27; by means of stepper motor 6 pivotable suction nozzle 4; Thread 9; pneumatically actuable storage nozzle 60; Paraffining device 17; Cross-wound bobbin 8, winding device 3 with creel 22, via a reversible single drive 56 acted upon drive drum 23 and driven by a stepping motor 57 Fadenchangiereinrichtung 24; and a device 35 with pneumatic connection lines 11, 12 and 13 connected to the central suction air system via shut-off means 14 and 15, wherein the workstation control 25 inter alia for sending the Saugluftanforderungen SD via the CAN bus 28 to the central control unit 10 and via the lines 18 and 19 is provided for controlling the shut-off means 14 and 15.

To achieve greater flexibility in the suction air supply is the shut-off 15, unlike the DE102006050220A1 , but not in the common for suction nozzle 4 and storage nozzle 60 connecting line 13, but in the own for the storage nozzle 60 connecting line 11. This then also allows the Saugluftversorgung only the suction nozzle 4 with separated by the blocking means 15 of the central suction system 20 storage nozzle 60th

FIG. 3 schematically shows the structure of three CAN telegrams, which would send a workstation controller 25 via the CAN bus 28 to the central controller 10. It is in the upper part of FIG. 3 the CAN message for the initial Saugluftanforderung before the start of a process, while the middle and the lower part of each update of the Saugluftanforderung after the occurrence of a change in the Job represents. The telegrams first identify the requesting workstation and, within the workstation, the requesting process. Then, a distinction is made between initial request and update and the maximum suction air requirement expected during the course of the process, more precisely the intake air requirement change from the previous expectation, is specified. The initial request still gives priority, since in this example a priority-driven queue is used.

In the telegram structure shown here, in particular the request update, the central controller 10 only needs to remember the sum of all already assigned VSEs (and the waiting processes). Because the updates each indicate their Saugluftbedarfsänderung directly, and in this example, an update should always be allocated, the central controller 10 must only offset this each with the stored VSE sum to always know the current status of the assigned VSE. Similarly, when assigning the example 80 VSE of the initial Saugluftanforderung this is in fact just as a change in the total Saugluftbedarfs. Here, too, the central controller 10 has to balance this 80 VSE only to the stored VSE sum.

Here it is particularly clear that the Saugluftzuteilung not done in contrast to the prior art according to the number of simultaneously supplied with suction air 1 jobs. For the central controller 10 does not know this number at all, but only remembers the sum of the VSE assigned at the same time. Thus, the central controller 10 knows in the example of FIG. 3 which is based on the piecing process, in the end not that this process is completed at this job 1. Because the central controller 10 only nettes the total sum of the VSE and no partial sums of the VSE at the process and workstation level, so do not know that the VSE of this concrete piecing process now offset to 0, so this no longer expects Saugluftbedarf and thus with respect to the Saugluftvergabe can be considered as finished.

Although the central control 10 job and process ID must be notified. Because they need this on the one hand to tell this in Saugluftzuteilung this by answer CAN telegram, and on the other hand, to stop this Saugluftanweigerung this Saugluftanforderung in the queue. But storing the requested Saugluftbedarfs takes place only in the latter case, that is, in the case of allotment, and again, only the initially reported suction air demand, here of 80 VSE, is set in the queue, while a balancing of the suction air requirement at the workstation and process level in the central control 10 never takes place.

Finally, depending on the embodiment of the invention, the CAN telegram can still be simplified by omitting the process ID. This is e.g. possible if at work at the same time always only a single process is active or if the job 1 in the first lack of Saugluftzuteilung no further suction air requirements for more of their processes. Because then the job 1 is always clear which of their processes is still waiting for suction and the central controller 10 can manage the not yet rationsreifen Saugluftanforderungen purely using the workstation IDs in the queue.

FIG. 4 to illustrate the Saugluftzumilungsverfahrens an example of a possible sequence of Saugluftanforderungen represents and indicates the operated work organs and the respective state of the queue. In an open-end spinning machine, the suction air system can provide a maximum of 600 VSE, is started in line 1 at time 1 by a starting situation of 540 VSE allocated, of which twice each 100 VSE on the high-priority cleaning and changer car RWW accounts, four times each 80 VSE on the suction nozzles SD, which are given low priority in the automatic piecing process, and once 20 VSE on a storage nozzle which is also prioritized in the automatic piecing process. At this point in time 1, the queue is still empty.

In line 2 is a third cleaning and changer car RWW with a suction air requirement of 100 VSE high priority added, but because of the otherwise exceeding the maximum capacity of 600 VSE can not be operated, but is put into the queue. Correspondingly, in line 3, the requirement of the suction nozzle of 80 VSE, which is highly prioritized by the operating personnel during manual piecing, must be set with the subsequent time input to the waiting queue.

At time 4, however, a storage nozzle stops operating and releases its 20 VSEs. These are used to deliver the now totally free 80 VSE to the waiting high priority manual suction nozzle request from line 3. So here is one Uses allocation methodology which, within the same priority class, does not strictly address the timing of intake air requirements, but primarily seeks to maximize the capacity of the vacuum system; otherwise the requirement of the third cleaning and swap body RWW, which had already been received earlier at time 2, would have blocked the operation of the manual suction nozzle request SD from the later time 3, although the RWW request from line 2 was exceeded (540 - 20 + 100 = 620> 600) itself could not have been assigned.

The further processes of the times 5 to 7 take place analogously to the scheme just discussed. Italics is then set in lines 8 and 9 nor a Vergabemethodik that prefers at least one earlier received, but lower priority Saugluftanforderung a higher priority, provided that the higher priority even within the maximum capacity of the Saugluftanlage can not be assigned. The skilled person can, however, supplement many other alternatives, all of which have their specific advantages and disadvantages.

Thus, although the Saugluftzuteilung invention has been described in the foregoing only in certain variants, it is clear to those skilled in the art that other variants are possible. The same applies to the here only exemplary selected processes of piecing and the cleaning and Wechslerwagentätigkeit at the open-end spinning machine. The inventive intake air allocation is e.g. equally applicable to the splicing process of a winder, where also the suction nozzle, the gripper tube, the dissolution tube, the splice channel and the thread catching and cleaning nozzle have different suction air requirements at different times.

Further, for the sake of completeness, it should be pointed out that the indefinite article does not exclude that components designated by it can not also be present multiple times. Likewise, the description of a particular component does not necessarily mean that its functions could not be distributed among several alternative components, or that the functions of several described components could not be grouped together.

Claims (10)

1. Method for allocating negative pressure, which is provided by a vacuum system (20) of a textile machine (5), to workstations (1) of the textile machine (5) that demand negative pressure, wherein negative pressure demands (SD) whose allocation would presumably cause a maximum capacity of the vacuum system (20) to be exceeded are put into a queue, and wherein negative pressure demands (SD) waiting in the queue are not allocated until it is no longer to be expected that the allocation of said negative pressure demands (SD) would cause the maximum capacity of the vacuum system (20) to be exceeded,
   characterised in that

   - the negative pressure demands (SD) contain information about the planned course of the negative pressure requirement of the negative pressure demands (SD), and

   - the evaluation of whether the allocation of a negative pressure demand (SD) would presumably cause the maximum capacity of the vacuum system (20) to be exceeded takes into account the planned course of the negative pressure requirement of said negative pressure demand (SD) and the negative pressure demands (SD) already allocated at the time of the evaluation.
2. Method according to claim 1, characterised in that a change in the planned course of the negative pressure requirement that arises during the processing of an allocated negative pressure demand (SD) in the demanding workstation (1) of said negative pressure demand (SD) is used to update the negative pressure demand (SD), which updated negative pressure demand (SD) is then taken as a basis of the further evaluation of whether new negative pressure demands (SD) can be allocated.
3. Method according to claim 1 or 2, characterised in that the negative pressure requirement of the negative pressure demands (SD) and the maximum capacity of the vacuum system (20) are expressed in volumetric flow rate units (VSE).
4. Method according to claim 1 or 2, characterised in that, if the negative pressure requirement of an allocated negative pressure demand (SD) exceeds the original planned course of said negative pressure requirement because of an unplanned event, the allocation of said negative pressure demand (SD) is maintained even if this causes the maximum capacity of the vacuum system to be exceeded.
5. Method according to claim 1 or 2, characterised in that, if the negative pressure requirement of an allocated negative pressure demand (SD) exceeds the original planned course of said negative pressure requirement because of an unplanned event, the allocation of said negative pressure demand (SD) is cancelled if the maximum capacity of the vacuum system would otherwise be exceeded.
6. Method according to claim 1 or 2, characterised in that priorities are assigned at least to the negative pressure demands (SD) put into the queue, and the negative pressure demands (SD) waiting in the queue are handled primarily in accordance with the order of the priority of said negative pressure demands (SD).
7. Device (10, 25) for carrying out a method according to claim 1,
   characterised in
   that the device (10, 25) comprises one or more controllers (10, 25) for the generation or the receipt and the further processing, in accordance with claim 1, of the negative pressure demands (SD) of the workstations (1) of the textile machine (5).
8. Device (10, 25) according to claim 7, characterised in that

   - a controller (25) associated with a particular workstation (1) of the textile machine (5) is provided for the generation of the negative pressure demands (SD) of said workstation (1), and

   - that a central controller (10) of the textile machine (5) is provided for the receipt and the further processing, in accordance with claim 1, of the negative pressure demands (SD) for the entire textile machine (5).
9. Controller (10, 25) for a device according to claim 7,
   characterised in that
   the controller (10, 25) is provided for the generation or the receipt and the further processing, in accordance with claim 1, of a negative pressure demand (SD) of a workstation (1) of the textile machine (5).
10. Computer program for a controller (10, 25) according to claim 9, wherein the controller (10, 25) is program-controlled,
    characterised in that,
    when the computer program runs on the controller (10, 25), the controller (10, 25), in the operation thereof, generates or receives and further processes, in accordance with claim 1, a negative pressure demand (SD) of a workstation (1) of the textile machine (5).

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