EP3757264B1 - Method for operating a partially or fully automatic spinning machine for creating cross-wound spools - Google Patents

Description

The present invention relates to a method for operating a partially or fully automatic spinning machine for producing cross-wound bobbins, in particular an open-end rotor spinning machine, with a plurality of similar, at least partially self-sufficient work stations arranged next to one another, each of the work stations having a spinning device for producing a thread and a winding device having a bobbin holder for winding the thread onto a cross-wound bobbin. When one of the work stations reaches the end of a batch, the work station in question is stopped.

Partially or fully automatic spinning machines are known in various designs from the state of the art. The workstations of these spinning machines each have a spinning device, for example an open-end spinning rotor, for producing a thread, a winding device for winding the produced thread onto a cross-wound bobbin and a large number of other elements for producing the thread and for handling the produced thread and the fiber material provided. The essential components for producing the thread are the so-called spinning means, which in a rotor spinning machine include the spinning rotor, the thread take-off nozzle and the opening roller.

If a so-called batch change is to be carried out on a spinning machine or at an individual work station, i.e. a yarn with different properties than before is to be produced, a lot of conversion work is required at the individual work stations. In the simplest case, only other empty tubes have to be provided and some operating parameters of the spinning machine or the work station have to be changed. As a rule However, the fibre material provided and at least some of the aforementioned spinning elements must also be replaced by an operator.

In the case of centrally driven spinning machines, it is always necessary to carry out the batch change at all jointly driven workstations at the same time. In contrast, in the case of spinning machines with so-called at least partially self-sufficient workstations, which can carry out a large part of the maintenance work independently using control elements arranged at the workstations, it is possible to produce different yarn batches at the individual workstations. In any case, however, converting the workstations to the new batch takes a considerable amount of time, which leads to longer downtimes at the workstations and the associated loss of productivity.

In order to reduce the time required for servicing several workstations or for resetting the workstations when changing batches, EN 10 2004 044 551 A1 It is proposed that the advisory work that is required be divided into manual and machine-based work steps. In this way, the operating personnel can carry out the manual work steps at work stations that have already been shut down, while an automatic maintenance device carries out the work steps that are to be carried out mechanically. In the case of a centrally driven spinning machine, where the batch change is carried out simultaneously at a large number of work stations, this can result in considerable time savings.

The EP 2 955 143 A1 describes a semi-automatic spinning machine in which display means are arranged at the individual work stations to show the yarn batch produced at the work station. The display means are preferably designed as LED lights.

From the EN 10 2014 018 628 A1 It is also known to arrange an LED light rail at each work station on a spinning machine. The light rail shows the yarn batch produced and/or operating status at the respective work station. This allows the operating personnel to quickly identify which work stations are producing the same yarn batch on a spinning machine with multiple batches, on which several yarn batches are produced at the same time. The operating personnel can also use the different colored LED lights to identify which problem is present at which work station and use this to determine an advantageous sequence for dealing with the problems.

From the EP 2 762 617 A1 It is also known to use a flashing LED signal to indicate that the work station in question has reached the end of the batch. The D1 now provides that the LED assigned to a work station that has reached the end of the batch begins to flash. The operator can tell from the flashing that the work station in question has reached the end of the batch, but this does not give him any information as to whether or not he needs to work on this work station and what activities he may need to carry out.

From the republished EP 3 511 452 A1 It is also known to arrange graphic display elements at the workstations, each of which is assigned to several workstations. The individual display areas of the display can be adjusted in size. The document also describes that the display can also show the maintenance requirements of the workstations during normal operation . However, nothing is said about reaching the end of the game.

The object of the present invention is to propose a method for operating a spinning machine and a spinning machine which has a enables batch changes to be made as quickly as possible, even at individual workstations.

The problem is solved by a method having the features of patent claim 1.

In the method for operating a partially or fully automatic spinning machine for producing cross-wound bobbins, in particular an open-end rotor spinning machine, with a plurality of similar work stations arranged next to one another, each of the work stations has a spinning device for producing a thread and a winding device having a bobbin holder for winding the thread onto a cross-wound bobbin. When a batch end is reached at one of the work stations, the work station in question is stopped.

It is proposed that a requirement to carry out at least one manual maintenance activity be indicated at the work station that has reached the end of the batch. This enables the operating personnel to quickly identify which work stations require manual activities and can therefore carry out these activities quickly and preferentially. This means that the work stations that need to be converted for a batch change can also be processed very quickly by the operator. The work stations can then resume production quickly and downtimes at the work stations concerned can be kept to a minimum.

It is also advantageous if the current batch is displayed at the workstations, especially by means of a color display. The operating personnel can then quickly see which workstations are producing the same batch of yarn. This also helps to ensure that the Operating personnel are supported in determining a sensible sequence for carrying out manual maintenance. In addition, this makes it easier for operating personnel to check the condition and equipment of the respective work stations, for example whether the correct fiber material or the correct empty tubes are available for the yarn batch in question.

In principle, the need to carry out at least one manual maintenance activity at the work station which has reached the end of the batch can be indicated in various ways.

After a first execution of the method, the need to carry out at least one manual maintenance activity is indicated by an occupancy status of the bobbin holder of the relevant work station. The occupancy statuses of the bobbin holder can be, for example, "empty", "occupied" or "misoccupied". If there is a discrepancy between the occupancy status of the bobbin holder and the display of the current batch at the work station, this signals to the operating personnel that at least one manual maintenance activity needs to be carried out. In this case, the display of the manual maintenance requirement is therefore carried out by components of the respective work stations themselves.

If a storage position for empty tubes is provided at the work station, it is alternatively or additionally possible for the need to carry out at least one manual maintenance activity to be indicated by an occupancy status of the storage position for empty tubes. Here too, the occupancy statuses "empty", "occupied" or "misoccupied" are conceivable. If, for example, there is a discrepancy between the occupancy status of the storage position where an empty tube from the new batch is already located and the display of the still current, old batch at the work station, this in turn signals to the operating personnel a need to carry out at least one manual maintenance activity.

For example, at the work station that has reached the end of the batch, a wound cross-wound bobbin from a current batch is automatically removed and the need to carry out at least one manual maintenance activity is indicated by an empty bobbin holder. The operating personnel can see from the empty bobbin holder that changeover work for a batch change must be carried out at this work station, because otherwise a new empty tube from the current batch would have been automatically inserted.

It is also possible that an empty tube from a new batch is provided in the supply position at the work station that has reached the end of the batch and the need to carry out at least one manual maintenance activity is indicated by the empty tube provided. Since the spool holder is still in the "empty" occupancy status, the operating personnel can see that manual maintenance activities must be carried out at this work station because otherwise the new empty tube would already have been inserted automatically. It is also possible that an empty tube from the new batch was provided in the supply position, but the current, old batch is displayed at the work station. From this discrepancy, the operating personnel can also see that there is a need to carry out at least one manual maintenance activity.

According to another design, at the work station that has reached the end of the batch, a wound cross-wound bobbin from a current batch is automatically removed and an empty tube from a new batch is automatically inserted. In this case, the need to carry out at least one manual maintenance activity is indicated by an incorrectly occupied bobbin holder, since the empty tube of the new batch that has already been inserted does not match the display of the current batch at the work station.

Of course, it is also possible for the need to carry out at least one manual maintenance activity to be indicated by a combination of the three different indicators, namely the occupancy status of the spool holder, the occupancy status of the supply position and the display of the batch at the work station. Various combinations are possible here.

According to the invention, the need to carry out at least one manual maintenance activity is indicated by an optical display element in the form of a graphic display assigned to the work station. The operating personnel therefore do not have to draw conclusions from the prevailing constellation at the work station, as in the first two embodiments mentioned, but receive a direct and clear indication of the need to carry out at least one manual maintenance activity. It is not conceivable according to the invention that the need to carry out at least one manual maintenance activity is only indicated by a colored light or a specific flashing light, which of course must be different from the displays of other states at the work station. The operating personnel must therefore know the exact meaning of the various colors and/or flashing signals in order to be able to assign them to different states on the spinning machine. Since the optical display element, on the other hand, is a graphic display, the operator is clearly and unambiguously informed in the form of text or graphic symbols that there is a need to carry out at least one manual maintenance activity.

It is therefore particularly advantageous if the need to carry out at least one manual maintenance task is indicated in the form of a graphic symbol. Such graphic symbols can be easily understood regardless of the language of the operating personnel.

It is also advantageous if, after actuating an input device assigned to the display element, at least a first manual maintenance activity to be carried out is displayed by the display element. The operator can thus find out which manual maintenance activity specifically needs to be carried out by actuating the input device. It is advantageous if the input device is a button on the display. In this case, the optical display element and the input device are combined in a touchscreen.

It is also advantageous if, after the operator has confirmed that the first manual maintenance activity has been carried out, a further manual maintenance activity to be carried out is displayed on the display element. The operator must therefore confirm that the first manual maintenance activity has been carried out and then receives precise information about which further specific maintenance activity is to be carried out. Of course, this can also be repeated several times so that the operator is guided step by step to carry out the necessary manual maintenance activities. Here, too, it is advantageous if the confirmation of the execution of the respective maintenance activity is made using a button on the graphic display.

For example, the operator can be instructed to replace the spinning rotor as the first maintenance task to be carried out, and to replace the fiber material as the second maintenance task. Another maintenance task to be carried out can be to provide suitable empty tubes and, if necessary, replace the take-off nozzle.

After an alternative execution of the procedure, a spinning agent exchange and/or a fiber material exchange is displayed as the manual maintenance activity to be carried out. The operating personnel can immediately see from the "spinning agent exchange" or "fiber material exchange" display that several manual maintenance tasks have to be carried out and these particularly complex work areas are then given priority.

In order to indicate to the operator as early and as quickly as possible the particularly high conversion effort required when changing the spinning agent, it can therefore also be advantageous, in deviation from the present method, to indicate the spinning agent change directly as a requirement to carry out at least one manual maintenance activity. This means that the operating personnel can already recognize as they walk past and without operating the input device that complex conversion work is required.

It is particularly advantageous if the first and/or subsequent manual maintenance activities are displayed in the form of a text display and/or in the form of a graphic symbol.

Furthermore, it is advantageous if, in the event of an impending batch change, the new batch is displayed at the relevant work station in addition to the current batch, in particular by means of a color display. This allows the operator to recognize before the end of the batch at the relevant work station that complex changeover work is pending and to have all the necessary new spinning agents, fiber materials, etc. ready. The time required for the batch change at the work station can thus be reduced even further.

Finally, it is advantageous if, after confirmation of the execution of the first and/or at least one further manual maintenance activity by the operator, the new batch is started at the work station, preferably started independently by the work station. Manual confirmation of the execution of the required maintenance activities by the operator can ensure that all required steps have been carried out correctly. This avoids false detections, which can occur when control software queries them automatically.

Furthermore, a spinning machine for producing cross-wound bobbins, in particular an open-end rotor spinning machine, with a plurality of similar work stations arranged next to one another is claimed. Each of the work stations has a spinning device for producing a thread and a winding device having a bobbin holder for winding the thread onto a cross-wound bobbin. The spinning machine also has a control device and a display element for carrying out the method described above.

Figur 1

eine Vorderansicht einer kreuzspulenherstellenden Spinnmaschine in Form einer Übersichtsdarstellung,

Figur 2

eine schematische Seitenansicht einer Arbeitsstelle einer kreuzspulenherstellenden Spinnmaschine,

Figur 3

eine Ansichtsdarstellung eines optischen Anzeigeelements mit einer ersten Anzeige,

Figur 4-8

eine Ansichtsdarstellung eines optischen Anzeigeelements mit verschiedenen weiteren Anzeigen,

Figur 9

eine schematische Seitenansicht einer Arbeitsstelle einer kreuzspulenherstellenden Spinnmaschine mit einem Spulenhalter mit einem ersten Belegungszustand,

Figur 10

eine schematische Seitenansicht einer Arbeitsstelle einer kreuzspulenherstellenden Spinnmaschine mit einem Spulenhalter mit einem zweiten Belegungszustand, sowie

Figur 11

eine schematische Seitenansicht einer Arbeitsstelle einer kreuzspulenherstellenden Spinnmaschine mit einer Vorratsposition für Leerhülsen.

Further advantages of the invention are described in the following embodiments. They show:

Figure 1

a front view of a cross-wound bobbin spinning machine in the form of an overview,

Figure 2

a schematic side view of a workstation of a cross-wound bobbin spinning machine,

Figure 3

a view of an optical display element with a first display,

Figure 4-8

a view of an optical display element with various other displays,

Figure 9

a schematic side view of a workstation of a cross-wound bobbin spinning machine with a bobbin holder with a first loading state,

Figure 10

a schematic side view of a workstation of a cross-wound bobbin spinning machine with a bobbin holder with a second loading state, and

Figure 11

a schematic side view of a work station of a cross-wound bobbin spinning machine with a storage position for empty tubes.

In the following description of the figures, the same reference symbols are used for features that are identical or at least comparable in the individual versions or the individual figures. Some of the features are therefore only explained when they are first mentioned or only once using a suitable figure. If these features are not explained again separately in connection with the other figures, their design and/or mode of operation corresponds to the design and mode of operation of the identical or comparable features described. For reasons of clarity, if there are several identical features or components in a figure, only one or only a few of these identical features are labeled.

Figure 1 shows a schematic front view of a spinning machine 1 for producing cross-wound bobbins in an overview. The spinning machine 1 is designed as an automatic or at least partially automatic spinning machine 1 and has a large number of similar work stations 2 arranged next to one another, which are arranged between two end frames not specified here. Each of the work stations 2 has a feed device for a fiber material 7, which in the case of an open-end rotor spinning machine is designed as an opening roller 8 (see Figure 1 ). Furthermore, each of the work stations 2 has a spinning device 3 for producing a thread 6, a take-off device 9 for drawing off the produced thread 6 and a winding device 4 for winding the produced thread 6 onto a cross-wound bobbin 10. The work stations 2 are designed as at least partially self-sufficient work stations. This means that the individual work stations 2 have a large number of individual drives for driving their thread-producing organs, so that the individual work stations can also be operated independently of the other work stations 2 of the spinning machine 1. Furthermore, the work stations 2 can independently resolve at least some of the faults that occur during operation without the need for an operating robot or the intervention of an operator. Other components, not shown here, such as handling organs and maintenance organs, are therefore arranged at the work stations 2. Furthermore, a display element 12 is provided at each of the work stations 2, which can, for example, display various operating states of the work stations 2 or the respective yarn batch produced. As an alternative to the illustration shown, it is also conceivable that two work stations 2 are assigned a display element 12 together.

Figure 2 shows a work station 2 of such a spinning machine 1 in a schematic side view. The spinning machine 1 is designed as an open-end rotor spinning machine and therefore has an opening roller 8 as a feed device and a spinning rotor 13 as a spinning element of the spinning device 3. The thread 6 produced in the spinning rotor 13 is drawn off via a take-off nozzle 14 and fed to the winding device 4. The winding device 4 has a bobbin holder 5 in which an empty tube 11 (see Fig.9 and 10 ) which can then be wound into a cross-wound bobbin 10. A winding roller 19 is provided to drive the winding device 4. The individual drives of the at least partially self-sufficient work stations 2 as well as other handling and maintenance elements of the work stations 2 are in Figure 2 also not shown.

On such spinning machines 1 with at least partially self-sufficient work stations 2, it is possible to produce several yarn batches simultaneously at different work stations 2. A batch change from an old, still current yarn batch to a new yarn batch can therefore also be carried out at a single work station 2. In order to carry out a batch change, numerous conversion operations are usually required after the work station 2 has been shut down, which include, for example, replacing the fiber material 7 provided and at least some of the spinning means, which here are formed by the spinning rotor 13, the opening roller 8 and the take-off nozzle 14. Furthermore, the provision of other empty tubes 11 (see Fig.9 and 10 ) is required. In order to keep the downtimes and the associated production losses of the work stations 2 intended for a batch change as low as possible, it is intended that a need to carry out at least one manual maintenance activity is indicated at a work station 2 which has reached the end of the batch.

Preferably, the manual maintenance requirement is indicated by an optical display element 12, as described below with reference to Figures 3 to 8 Alternatively, however, it is also possible to indicate the need to carry out at least one manual maintenance activity by an occupancy state of the coil holder 5, as can be seen from the Figures 9 and 10 described.

Figure 3 shows a view of an optical display element 12, which is designed as a graphic display 15. Figure 3 The display 15 shows a first display that indicates a regular operating state of the workstation 2. In this regular operating state, the current batch, here designated "A", is shown by a color display 20 (shown here in light dots). Furthermore, the regular operating state itself is shown by an easily understandable graphic symbol 16. The display element 12 is assigned an input device 17, by means of which the Operators can make inputs and communicate with a control unit of workstation 2 (not shown here) and/or a central control unit (also not shown). In the present case, the display element 12 or the display 15 and the input device 17 are combined in one structural unit, so that the input device 17 is formed by various buttons 18 of the display 15. In the display shown here, the display 15 has, for example, a button 18 for retrieving information. By pressing this button, the operator can access the menu of the control unit of workstation 2 and make various settings there.

Figure 4 shows a view of the display element 12 or the display 15, which indicates a need to carry out at least one manual maintenance activity when the end of the batch of the relevant work station 2 is reached. The current batch is still shown by the color display 20. The need to carry out at least one manual maintenance activity is shown here by another, easily understandable graphic symbol 16. The operating personnel can use this symbol to very quickly see that manual activities are to be carried out at this work station 2 and can therefore work on these work stations 2 preferentially or plan the maintenance of the relevant work stations better. The display of the need to carry out at least one manual maintenance activity is again designed as a button 18 in the present case, which can be recognized both by the frame surrounding the button 18 and by the prompt to actuate it by means of the check mark. If the operator now presses this button 18, he receives more detailed information on which specific maintenance activities are to be carried out in a subsequent display.

Figure 5 now shows another display on the display 15, which the operator can see after pressing the button 18 of the previous display ( Figure 4 ) or, in the general case after actuating the input device 17, displays the manual maintenance activity to be carried out. In the present example, the task "Check Spinning Components" is displayed in the form of a display text. This and any subsequent displays inform the operator that he must check the spinning components and replace them if necessary.

The advantage here is that the same displays can be used for both faults in regular spinning operations that lead to a standstill at work station 2 and when maintenance is required due to an upcoming batch change. The operator only needs to be informed that at least one manual maintenance activity needs to be carried out and is then guided through the menu and given step-by-step instructions. The operator therefore does not need to differentiate between faults in regular operations and batch changes and does not need to think about which manual maintenance activities he needs to carry out in which case, but simply needs to follow the instructions that can be called up one after the other, as will be explained below.

Of course, it would also be conceivable not to perform the manual maintenance work as in Figure 5 in the form of a display text, but also by a graphic symbol. For example, in Figure 6 a display on the display 15 is shown, which the operator can see after pressing the button 18 of the previous display ( Figure 4 ) displays the task "Replace spinning device" as a manual maintenance activity to be performed.

The displays of the manual maintenance activities to be carried out (Figures 5 and 6) also contain a button 18, by means of which the operator must confirm the execution of the maintenance activity after it has been completed. After the operator has confirmed the execution of the maintenance activity , another required manual maintenance activity may be displayed, which the operator must also confirm, whereupon another required manual maintenance activity may be displayed. Once all required manual maintenance activities have been carried out and confirmed by the operator, work station 2 can resume production independently and start the new batch.

Since the exchange of spinning agents in the event of a batch change is time-consuming, it can also be advantageous to display the required spinning agent exchange directly to the operator. This is shown in the display of the Figure 7 The required maintenance activity "Replace spinning device" is displayed to the operator by a graphic symbol 16. The display of the required maintenance activity is again shown as a button 18, by means of which the operator can directly confirm that the maintenance activity has been carried out. The current batch is still shown in display 15 with the color display 20. The button 18 for retrieving information is also included. It is conceivable that the operator receives this display after he has pressed the button for the Figure 4 Alternatively, it is also possible for the "Change spinning agent" display to appear directly when the relevant work station 2 has reached the end of the batch. The operating personnel can thus see at first glance that the need to carry out at least one manual maintenance activity involves a batch change with a spinning agent change and can give priority to these work stations 2. This is particularly advantageous if specially trained personnel are required for such a spinning agent change. The personnel can thus immediately see whether simple manual maintenance activities are to be carried out or a spinning agent change for which specially trained personnel is required.

In order to further reduce the time required for retooling workstations 2 in the event of a batch change, it may also be advantageous to indicate in advance that a batch change is pending at the relevant workstation 2. This is indicated in the display of the Figure 8 Workstation 2 is still in regular operation, which can be seen from the graphic symbol 16. Just as in Figure 4 The button 18 for retrieving information is also visible. In the upper part of the display 15, however, in contrast to the representation of the Figure 4 In addition to the colour display 20 of the current batch (light dotted and marked "A"), the colour display 21 of the new batch (dark dotted and marked "B") can also be seen. The operator can thus have all the necessary spinning materials and the like ready and after the batch has been finished, which is indicated by the display according to the Figure 4 or 7 is recognizable, carry out the spinning agent exchange and all other necessary steps.

The Figures 9 to 11 finally show an alternative embodiment in which the need to carry out at least one manual maintenance activity is indicated by the occupancy state of the spool holder 5 or the occupancy state of a supply position 22 for empty tubes 11.

This shows Figure 9 a situation in which workstation 2 has reached the end of the batch and has already been shut down. In this case, empty tubes 11 of the new batch are already provided at spinning machine 1. The batch change has already been initiated by the control unit of workstation 2 and/or spinning machine 1 by inserting an empty tube 11 of the new batch into bobbin holder 5, as can be seen from the dark dotted color of the empty tube. However, display element 12 still shows the color display 20 of the just finished, still current batch. The inserted empty tube 11 does not match the displayed batch, so that bobbin holder 5 has the "incorrectly loaded" status. Operating personnel can therefore recognize from the idle workstation 2 and the incorrect occupancy of the bobbin holder that a batch change is pending and manual activities must be carried out.

Similarly, in Figure 10 the work station 2 is shown after the end of the batch has been reached and the machine has stopped. However, no new empty tube 11 has been inserted. The bobbin holder 5 is therefore in the "empty" state. The operating personnel can now see from the "empty" state and the display of the current batch that a batch change is pending and that manual activities must be carried out.

Figure 11 shows a work station 2, which additionally has a supply position for empty tubes 11, whereby the need to carry out at least one manual maintenance activity is indicated by the empty tube 11 provided. Here, the work station 2 has again reached the end of the batch and has already been shut down. Just as with Fig.9 empty tubes 11 of the new batch are already provided on the spinning machine 1. The batch change has already been initiated by the control unit of the work station 2 and/or the spinning machine 1 by providing an empty tube 11 of the new batch (dark dotted color) in the supply position 22, but has not yet been inserted into the bobbin holder 5. The bobbin holder 5 therefore has the "empty" occupancy status. The operating personnel can therefore recognize from the empty tube provided and the "empty" occupancy status of the bobbin holder that a batch change is pending and that manual activities must be carried out.

In the present case, the color display 20 of the currently completed batch is also shown by the display element 12. The empty tube 11 provided in the supply position 22 therefore does not match the displayed batch, from which the operating personnel can also recognize that a batch change is pending and manual activities must be carried out. are.

The invention is not limited to the embodiments shown. Modifications, such as a combination of features, even if these are shown and described in different embodiments, are possible within the scope of the patent claims.

List of reference symbols

1

spinning machine

2

place of work

3

Spinning device

4

Winding device

5

Spool holder

6

thread

7

Fibre material

8th

Opening roller

9

Extractor

10

Cross-wound bobbin

11

Empty tube

12

Display element

13

Spinning rotor

14

Extractor nozzle

15

Display

16

graphic symbol

17

Input device

18

button

19

Spool roller

20

Color display of the current game

21

Color display of the new batch

22

Stock position

Claims (13)

1. Method for operating a partially or fully automatic cross-wound bobbin-producing spinning machine (1), in particular an open-end rotor spinning machine, having a plurality of identical workstations (2) which are arranged next to one another and are at least partially self-sufficient, wherein each of the workstations (2) has a spinning device (3) for producing a thread (6) and a winding device (4), which has a bobbin holder (5), for winding the thread (6) onto a cross-wound bobbin (10), and wherein, when a batch end of one of the workstations (2) is reached, the relevant workstation (2) is stopped, characterized in that , at the workstation (2) which has reached the batch end, a requirement for carrying out at least one manual maintenance activity in the form of text or a graphic symbol (16) is displayed by an optical display element (12), which is assigned to the workstation (2) and is in the form of a graphic display (15).
2. Method according to the preceding claim, characterized in that the respectively current batch is displayed at the workstations (2), in particular by a color indication (20).
3. Method according to one of the preceding claims, characterized in that the requirement for carrying out at least one manual maintenance activity is displayed by an occupancy state of the bobbin holder (5) and/or by an occupancy state of an inventory position (22) for empty tubes (11) of the relevant workstation (2).
4. Method according to one of the preceding claims, characterized in that, at the workstation (2) which has reached the batch end, a wound cross-wound bobbin (10) of a still current batch is automatically removed and the requirement for carrying out at least one manual maintenance activity is displayed by an empty bobbin holder (5).
5. Method according to one of the preceding claims, characterized in that, at the workstation (2) which has reached the batch end, an empty tube (11) of a new batch is provided in the inventory position and the requirement for carrying out at least one manual maintenance activity is displayed by the provided empty tube (11).
6. Method according to one of the preceding claims, characterized in that, at the workstation (2) which has reached the batch end, a wound cross-wound bobbin (10) of a still current batch is automatically removed and the empty tube (11) of the new batch is automatically inserted and the requirement for carrying out at least one manual maintenance activity is displayed by an incorrectly occupied bobbin holder (5).
7. Method according to one of the preceding claims, characterized in that, after an input device (17), in particular a first push button (18), which is assigned to the display element (12) has been actuated, at least one first manual maintenance activity which is to be carried out is displayed by the display element (12).
8. Method according to one of the preceding claims, characterized in that, after the operator has confirmed that the first manual maintenance activity has been carried out, in particular after a further push button (18) of the graphic display (15) has been actuated, a further manual maintenance activity which is to be carried out is displayed by the display element (12).
9. Method according to one of the preceding claims, characterized in that a change of spinning means and/or a change of fiber material is displayed as a requirement for carrying out at least one manual maintenance activity or as a manual maintenance activity which is to be carried out.
10. Method according to one of the preceding claims, characterized in that the first and/or the further manual maintenance activity is displayed in the form of a text display and/or in the form of a graphic symbol (16).
11. Method according to one of the preceding claims, characterized in that, in the event of an imminent batch change at the relevant workstation (2), the new batch is also displayed, in particular by a color indication (21), in addition to the current batch.
12. Method according to one of the preceding claims, characterized in that, after the operator has confirmed that the first and/or the at least one further manual maintenance activity has been carried out, the new batch is started at the workstation (2), preferably started independently by the workstation (2).
13. Partially or fully automatic cross-wound bobbin-producing spinning machine (1), in particular an open-end rotor spinning machine, having a plurality of identical workstations (2) which are arranged next to one another and are at least partially self-sufficient, wherein each of the workstations (2) has a spinning device (3) for producing a thread (6) and a winding device (4), which has a bobbin holder (5), for winding the thread (6) onto a cross-wound bobbin (10), and having a control device and a display element (12) for carrying out the method according to one of the preceding claims.

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