Method for carrying out a sleeve change

Abstract

The invention relates to a method for carrying out a tube change by means of a changing device on a spinning machine, comprising the following steps: - detecting at least two points in time at which a thread guide reaches a first predetermined position, wherein the thread guide oscillates along a thread guide guide, - calculating a time period on the basis of the at least two detected points in time, wherein the time period specifies a time which the thread guide requires to reach a second predetermined position along the thread guide guide starting from the first predetermined position, - determining a point in time on the basis of the calculated point in time which is specific for the thread guide reaching the second predetermined position starting from the first predetermined position along the thread guide guide, - initiating a measure for carrying out a tube change on the basis of the determined point in time.Furthermore, the invention relates to a changing device for carrying out a sleeve change.

Description

[0001] The present invention relates to a method for carrying out a tube change by means of a changing device on a spinning machine, a changing device and a computer program for this purpose. State of the art

[0002] Spinning machines are widely used in the textile industry to produce yarns. For example, spinning machines can combine manual and automated processes, with operators feeding the spinning material into the machine and monitoring the spinning operations while the machine carries out the actual spinning process. Spinning machines can be used for different types of fibers to produce a wide variety of yarns, also known as threads, and are available in various configurations depending on the specific production requirements. Semi-automatic spinning machines have different types of manual bobbin changes, depending on the type or manufacturer of the machine. For example, a thread can be manually cut by an operator and disposed of separately until a new thread is produced after the bobbin is changed or...The operator inserts a new bobbin and the bobbin can be fed back into the winding process. The disadvantage of these changes is that the cycle time for the operator to change the bobbin is very time-consuming and can be very long, meaning that the thread still being produced by the spinning machine during this time often has to be disposed of as waste. Disclosure of the invention

[0003] Therefore, it is an object of the invention to eliminate or at least reduce the disadvantages of the prior art. In particular, it is an object to perform a bobbin change on a spinning machine, in particular a rotor or air-jet spinning machine, and especially a semi-automatic rotor spinning machine, without substantially interrupting the spinning process or keeping the interruption as short as possible.

[0004] The invention relates to a method having the features of claim 1, a changing device having the features of claim 10, and a computer program having the features of claim 12. Further features and details of the invention emerge from the respective subclaims, the description, and the drawings. Features and details described in connection with the method according to the invention naturally also apply in connection with the changing device according to the invention and the computer program according to the invention, and vice versa, so that with regard to the disclosure of the individual aspects of the invention, reference is always made to each other.

[0005] The invention particularly relates to a method for carrying out a tube change using a changing device on a spinning machine. The method comprises the following steps: Detecting at least two points in time at which a thread guide reaches a first predetermined position, wherein the thread guide oscillates along a thread guide guide, calculating a time period on the basis of the at least two detected points in time, wherein the time period specifies a time which the thread guide requires to reach a second predetermined position along the thread guide guide starting from the first predetermined position, determining a point in time on the basis of the calculated point in time which is specific for the thread guide reaching the second predetermined position starting from the first predetermined position along the thread guide guide, initiating a measure for carrying out a sleeve change on the basis of the determined point in time.

[0006] Determining the specific time at which the yarn guide reaches the second predetermined position along the yarn guide guide enables the changing device to separate the yarn from the yarn guide at that specific time, thus initiating the replacement of the fully wound tube, a so-called full bobbin, with an empty tube. On the other hand, determining the aforementioned time can also serve to initiate the action of aligning the suction device to the area of ​​a tube plate holding the empty tube at that specific time, in the case of a yarn that has already been separated and sucked away for storage, so that the changing device, also referred to as a changer or service unit, can initiate the action of aligning the suction device to the area of ​​a tube plate holding the empty tube, so that the yarn can be taken away by the tube plate and the winding process can be continued. Such tube plates are well known in the art.The tube plate is a component of a winding device on a spinning machine, designed to rotatably support the tube to be wound by means of the tube plate. For example, the tube plate can have circumferentially distributed notches to carry the thread, forming a thread catch hook to catch and carry the thread provided for carrying in the area of ​​the tube plate as the tube plate rotates. This has the advantage of significantly reducing the interruption of the winding process. The temporal synchronization of the tube change with the cutting and re-attachment of the thread in the traversing area, depending on the specified position of the thread guide, enables very short interruption times, particularly in the single-digit second range, to the winding process due to the tube change.The term "traversing range of a yarn" refers to spinning machine technology and describes the area in which the yarn (the "thread") traverses back and forth within a winding device to ensure continuous tube winding and thus production. The term "traversing range" thus describes the area in which the "traversing" of the yarn takes place. In other words, the traversing range can be understood as the stroke range of the yarn guide, whereby the stroke range of the yarn guide can be variably adjusted, particularly depending on the situation and / or production.

[0007] Furthermore, it is conceivable that the initiation includes the following further steps if a wound core or a winding spool is to be replaced by an empty core: Separating the thread from the thread guide in a traversing area of ​​the thread at the specific time, sucking off the separated thread by a thread suction device, exchanging the wound tube for an empty tube by means of replacement means.

[0008] Cutting the yarn at a specific time allows the separated yarn to be sucked away by the yarn suction device. This also has the advantage that the yarn is cut at the second predetermined position in the yarn traversing range at the specific time, allowing the replacement of the winding package with an empty tube to be initiated more quickly. Furthermore, cutting the yarn allows it to be made available for further use during the tube change.

[0009] It is also optionally conceivable that the separation of the thread includes the following further step: Storing the separated thread in a thread storage unit, in particular in a storage chamber.

[0010] This eliminates the need to dispose of the thread as waste and further reduces production costs. Storing the thread has the advantage that the stored thread can be reused for the winding process after a tube change.

[0011] It may optionally be possible for the initiation to include the following further steps, depending on whether a wound core or a winding spool has been replaced by an empty core: Aligning the suction device to the area of ​​a tube plate holding the empty tube by means of a guide means depending on the specific time, taking over and carrying along the thread by the rotating tube plate depending on the specific time, picking up the thread by the thread guide depending on the takeover and carrying along.

[0012] Aligning the suction device at a specific time allows the thread to be picked up by the rotating tube plate at the right time, so that the thread is carried along by the rotating tube plate. This advantageously allows the winding process to continue.

[0013] Within the scope of the invention, it can be provided that the second predetermined position of the oscillating thread guide corresponds to a left and / or right end position along the thread guide guide. This position of the thread in the oscillating range of the thread or in the lifting range of the thread guide ensures effective cutting and / or takeover as well as entrainment of the thread before and / or after the tube change. Furthermore, this position allows the thread to be within the effective range of the thread cutting unit in order to be separated from the thread guide by the thread cutting unit at a specific time. After a tube change has been completed, this position allows the thread suction device to be aligned towards the nearby tube plate so that the thread can be taken over and entrained.

[0014] Within the scope of the invention, it can be provided that the first predetermined position of the oscillating yarn guide, at which the at least two points in time are detected, corresponds to a position between the center of a oscillating range of the yarn guide extending along the yarn guide and a left or right end position along the yarn guide. This position enables reliable detection of the direction of movement of the yarn guide, in particular in the direction of the second predetermined position, based exclusively on the at least two detected points in time, thereby enabling a reliable determination of the point in time and, moreover, the use of a cost-effective detection means is sufficient.

[0015] Alternatively, within the scope of the invention, the first predetermined position can correspond to the center of a traversing range of the yarn guide running along the yarn guide guide. This position is particularly beneficial for a space-saving design of the changing device through the appropriate arrangement of a detection means for detecting the at least two points in time. In addition, by comparing the calculated time periods and / or points in time, it can be easily determined whether the yarn guide is exposed to any influences along the yarn guide guide that require an inspection of the yarn guide and / or the yarn guide guide.

[0016] Furthermore, it can be provided alternatively within the scope of the invention that the first predetermined position is identical to the second predetermined position. The correspondence between the first and second positions, in conjunction with the correspondence of the second predetermined position with the left and / or right end position, advantageously facilitates the detection and / or determination of the dwell time of the thread guide at the second predetermined position, whereby the initiation of the measure can be carried out in a more reliable manner.

[0017] For example, it may be provided that the method includes the following further step: Receiving the at least two detected times with respect to the first predetermined position of the thread guide from a detection means.

[0018] This enables the at least two detected times to be received by the changer, in particular by the processing device of the changer, so that the determination and calculation means of the processing device can determine and calculate the time at which the thread guide reaches the second predetermined position along the thread guide guide. This has the advantage that the appropriate time with respect to the second predetermined position of the thread guide can be determined in order to initiate a measure regarding the implementation of the bobbin change. The detection means can optionally be designed as an optical sensor. The transmission of the at least two detected times to the processing device can be wired and / or wireless.

[0019] In a further embodiment, the tube change can be performed within a cycle time of less than 10 seconds, preferably between 3 and 5 seconds, with the cycle time being measured from the time the thread is cut to the time the thread is taken up. This has the advantage that the amount of thread produced during the tube change can be kept low. Furthermore, it allows the volume of the thread storage unit to be kept small, corresponding to the respective cycle time.

[0020] Another option is to use a semi-automatic rotor spinning machine. The use of a semi-automatic rotor spinning machine allows for significantly increased production speed and efficiency compared to manual processes. This has the advantage of ensuring faster production of spinning materials. These machines can advantageously ensure more uniform twist and tension of the spinning material, which allows for higher quality and consistency in the final products. Furthermore, such machines can often be used in a variety of ways and can be adapted to different spinning materials and requirements, increasing flexibility in production.

[0021] The invention also relates to a changing device for performing a tube change on a spinning machine, in particular according to a preferred embodiment of the above-described method according to the invention. The changing device comprises the following elements: a detection means for detecting at least two points in time at which a thread guide reaches a first predetermined position, wherein the thread guide oscillates along a thread guide guide, a processing device comprising: a calculation means for calculating a time period based on the at least two detected points in time, wherein the time period specifies a time which the thread guide requires to reach a second predetermined position along the thread guide guide starting from the first predetermined position, a determination means for determining a point in time based on the calculated point in time which is specific for the thread guide reaching the second predetermined position starting from the first predetermined position along the thread guide guide, an initiation means for initiating a measure for carrying out the tube change based on the determined point in time.

[0022] Thus, the changing device according to the invention brings with it the same advantages as have been described in detail with reference to a method according to the invention.

[0023] Optionally, it can preferably be provided that the changing device comprises further components: a thread separating unit for separating and / or severing a thread to be wound onto the tube, wherein the thread separating unit is further preferably arranged in the region of the second predetermined position, a thread suction device for suctioning the thread, which is designed to be positionable, in particular pivotable, and an exchange means for exchanging a wound tube or a winding package with an empty tube.

[0024] This allows the method according to the invention to be carried out quickly and efficiently. The respective component of the changer can assist the changer in carrying out the tube change. The thread-separating unit can be designed, for example, as a cutting device or scissors, so that the thread can be separated by cutting, in particular at the second predetermined position. The suction device for sucking out a thread can be a device that can be used to efficiently and precisely remove a thread from a specific location.

[0025] It can have a suction mechanism that creates a vacuum to suck in the thread and then transport it, for example, to a collecting device or a storage unit for the thread. Furthermore, the thread suction device can have a positioning device, in particular a pivoting device, to define the position of the thread suction device with a suction opening that sucks in the thread for thread capture and positioning. Positioning devices for the defined positioning of an element are sufficiently known from the prior art. The exchange means can, for example, be a gripping and transport mechanism that can be used to remove a wound tube or winding package from the winding device and replace it with or against an empty tube.

[0026] The invention also relates to a data processing device, in particular a processing device comprising means for carrying out the steps of the method according to the invention. Thus, the device according to the invention provides the same advantages as those described in detail with reference to a method according to the invention.

[0027] The invention also relates to a computer program, in particular a computer program product, comprising instructions that, when executed by a computer, cause the computer to execute the method according to the invention. Thus, the computer program according to the invention provides the same advantages as those described in detail with reference to a method according to the invention.

[0028] A data processing device, for example the device according to the invention, which executes the computer program can be provided as the computer. The computer can have at least one processor for executing the computer program. A non-volatile data memory can also be provided, in which the computer program is stored and from which the computer program can be read by the processor for execution.

[0029] It is also conceivable for the computer to comprise at least one integrated circuit such as a microprocessor or an application-specific integrated circuit (ASIC) or an application-specific standard product (ASSP) or a digital signal processor (DSP) or a field-programmable gate array (FPGA) or the like. The computer can furthermore have at least one interface for data exchange, e.g. an Ethernet interface or an interface for LAN (Local Area Network) or WLAN (Wireless Local Area Network) or System-on-a-Chip (SoC) or another radio interface such as Bluetooth or Near Field Communication (NFC). Furthermore, the computer can be designed as one or more control units, i.e. also as a system of control units. The computer can, for example, also be provided in a cloud and / or as a server in order to make data processing available for a local application via the interface.It is also possible that the computer is designed as a mobile device, such as a smartphone.

[0030] The invention may also provide a computer-readable storage medium comprising the computer program according to the invention. The storage medium is designed, for example, as a data storage device such as a hard disk and / or a non-volatile memory and / or a memory card. The storage medium can, for example, be integrated into the computer. Furthermore, the method according to the invention can also be embodied as a computer-implemented method.

[0031] Further advantages, features, and details of the invention will become apparent from the following description, which describes exemplary embodiments of the invention in detail with reference to the drawings. The features mentioned in the claims and in the description may be essential to the invention individually or in any combination. They show: Fig. 1 shows a schematic visualization of a method according to embodiments of the invention. Fig. 2 shows a schematic representation of the invention according to embodiments of the invention. Fig. 3 shows a schematic overview of the invention according to embodiments of the invention.

[0032] In the following figures, identical reference numerals are used for the same technical features, even in different embodiments.

[0033] In Fig. 1 a method 100 according to embodiments of the invention is shown schematically. Fig. 1 illustrates, according to embodiments of the invention, a method for carrying out a tube change on a semi-automatic spinning machine by means of a changing device 10. The method 100 comprises the following steps: In step 101, at least two points in time are recorded at which a thread guide 5 reaches a first predetermined position 6A, for example a position between a center of a traversing range of a thread guide 5 along a thread guide rod 4, which is designed as a thread guide guide, and a right-hand end position along the thread guide rod 4, wherein the thread guide 5 traverses along the thread guide rod 4 between a left and the right-hand end position. The combination of thread guide 5 and thread guide rod 4 is sufficiently known from the prior art. Alternatively, the thread guide 5 can be arranged on a thread guide belt as a thread guide guide instead of on a thread guide rod 4 in a previously known manner.The distance between the left and right end positions along the thread guide defines a traversing width or a stroke width of the thread guide 5. The stroke width of the thread guide 5 can be variably adjusted in a program-controlled and / or computer-aided manner. In step 102, a time period is calculated based on the at least two recorded points in time, wherein the time period specifies a time required by the thread guide 5 to reach a second predetermined position 6B along the thread guide rod 4 from the first predetermined position 6A.

[0034] In step 103, a time point specific for the yarn guide 5 to reach the second predetermined position 6B from the first predetermined position 6A along the yarn guide rod 4 is determined based on the calculated time period. In step 104, an action for performing a tube change is initiated based on the determined time point.

[0035] Fig. 2 shows a schematic representation of the invention according to embodiments of the invention. In Fig. 2 A changing device 10 according to embodiments of the invention is shown. The changing device 10 or the changer 10 according to Fig. 2 comprises, for example, detection means 11, a thread separating unit 12, a thread suction device 13, a thread storage unit 14, a processing device 15, a guide means 19, a computer program 20 and an exchange means 30.

[0036] The processing device 15 can in this Fig. 2 The illustrated embodiment includes the following elements: a calculation means 16 for calculating 102 a time period on the basis of the at least two detected points in time, wherein the time period specifies a time which the thread guide 5 requires to reach a second predetermined position 6B along the thread guide rod 4 from the first predetermined position 6A, a determination means 17 for determining 103 a point in time on the basis of the calculated time period which is specific for the thread guide 5 reaching the second predetermined position 6B starting from the first predetermined position 6A along the thread guide rod 4, an initiation means 18 for initiating 104 a measure for carrying out the tube change on the basis of the determined point in time.

[0037] The processing device 15 can be designed as a data processing device which can carry out the method according to the invention with the means 16, 17, 18.

[0038] The detection means 11 serves to detect 101 at least two points in time at which a thread guide 5 reaches a first predetermined position 6A, wherein the thread guide 5 oscillates along the thread guide rod 4. A detection means 11 can, for example, be an optical sensor. An optical sensor 11 is an electronic device that serves to detect light or other electromagnetic radiation and convert it into electrical signals. These sensors play an important role in various applications, including measurement technology and automation technology. The optical sensor 11 in Fig. 2 can detect a movement and / or position of objects such as that of an iridescent thread guide 4.

[0039] The thread cutting unit 12 serves to cut or separate a thread 3. It can be designed, for example, as a cutting device or scissors. It can cause a thread 3 cut by the thread cutting unit 12 to no longer be used for a spinning or winding process, since the thread supply to the tube to be wound or to the winding package is interrupted.

[0040] The thread suction device 13 serves to suction a thread. The suction device 13 comprises a suction tube with which a thread 3, in particular a severed thread 3, can be suctioned off using negative pressure. The suctioned thread 3 can then be stored, for example, in the thread storage unit 14 for later use in a spinning process. The thread storage unit 14 can be designed, for example, as a storage chamber of the changer 10 for storing the thread 3.

[0041] Furthermore, the changer 10 can have a positioning device 19, which serves to position and align the thread suction device 12 such that when the thread 3 is taken over, it is carried along by the rotating tube plate 2. Due to the rotation of the tube plate 2, which has hook-shaped catching devices, the thread 3 to be taken over is caught by the catching devices of the tube plate 2 and carried along. The positioning device 19 of the changer 10 thus ensures that the thread 3 to be taken over can be guided by the thread suction device 13 towards and into the area of ​​the tube plate 2 in order to be carried along there. The positioning device 19 can, for example, be in the form of a guide plate or a guide channel along which the thread suction device 13 can be guided or guided.

[0042] The changer 10 in Fig. 2 further comprises exchange means 30, which serve to replace a wound tube or the winding package with an empty tube 1. The exchange means 30 can be designed as a mechanical device, which, for example, has movable gripping devices that serve to exchange the winding package with the empty tube 1.

[0043] Furthermore, Fig. 2 a computer program 20. The changer 10, in particular the processing device 15, can carry out the method according to the invention by means of this program 20.

[0044] Fig. 3 shows a schematic overview of the invention according to embodiments of the invention. In Fig. 3 A tube plate 2 and a tube 1 or bobbin 1 of a semi-automatic spinning machine are shown. The tube plate 2 may have hook-shaped catching devices on its outer circumference, which can be used to "catch" or carry a thread 3 to continue the winding and spinning process.

[0045] A spinning machine can have a plurality of spinning stations and winding stations associated with the respective spinning stations. The spinning machine can be, for example, a semi-automatic rotor spinning machine. A changing device 10 according to the invention or a changer 10 can be associated with a spinning station, which enables the spinning station to interrupt the thread feed to the winding package during a tube change.

[0046] Furthermore, Fig. 3 a yarn guide bar 4, on and along which a yarn guide 5 traverses (arrow B). With reference to the yarn guide 5, "traversing" generally refers to the movement or back and forth of the yarn guide 5 on and along the yarn guide bar 4 and along the tube 1. This movement serves to guide the yarn 3 evenly and ensure that it is properly wound onto the tube 1 to be wound. Traversing can also be used to guide the yarn 3 in specific patterns or for special spinning requirements. The yarn guide 5 of the spinning machine moves on and along the yarn guide bar 4 to ensure that the yarn 3 is wound evenly onto the package or tube 1. This back and forth movement of the yarn guide 5 serves to guide the yarn 3 and ensure that it is wound evenly, without tangling or being unevenly wound onto the tube 1 to be wound.

[0047] In Fig. 3 Also shown are detection means 11, which serve to detect 101 at least two points in time at which the thread guide 5 reaches a first predetermined position 6A, wherein the thread guide 5 oscillates on and along the thread guide rod 4 (arrow B). The first predetermined position 6A can be provided, for example, between a center of a traversing range of the thread guide 5 along the thread guide rod 4, which is designed as a thread guide guide, and a right end position, or also right reversal position, of the thread guide 5 along the thread guide rod 4.

[0048] Based on the first predetermined position 6A of the thread guide 5 and the at least two points in time detected thereby, the changer 10 can determine or calculate the position or the correct point in time of the thread 3 or of the thread guide 5 in order to sever or cut the thread 3 at the specific point in time. At this specific point in time, according to the calculation by the changer 10, the thread 3 is located at a second predetermined position 6B in the traversing area, in which an effective area of ​​the thread cutting unit 12 of the changer 10 is also provided, so that the thread 3 can be severed. As soon as this has happened, the thread 3 is sucked away by the suitably positioned thread suction device 13. The thread 3 sucked away in this way can then be stored, for example, in a thread storage unit 14 until the tube is changed by the exchange means 30.In other words: the thread 3 is separated at the specific time and disposed of in the storage unit 14, i.e. stored, until the thread 3 is fed back into the winding process after the tube has been changed and an empty tube has been inserted by the exchange means 30. Once the exchange for an empty tube 1 has taken place, the thread suction device 13 is brought into the area of ​​the tube plate 2. A positioning device 19, comprising, for example, a guide plate, assists in this process and guides the thread suction device 13 towards and into the area of ​​the rotating tube plate 2 in order to achieve entrainment of the thread 3 by the rotating tube plate 2. For this purpose, the tube plate 2 can have hook-shaped catching devices which ensure that the thread 3 is entrained.

[0049] The core of the invention is the determination of a point in time based on at least two detected points in time, which is specific for the thread guide 5 with the thread 3 to reach the second predetermined position 6B along the thread guide rod 4. In Fig. 3 The second predetermined position 6B is shown, by way of example, as the right end position or right reversal position of the thread guide 5. By detecting at least two points in time with respect to a first predetermined position 6A, it is possible to (pre)calculate when the oscillating thread guide 5 will reach the second predetermined position 6B, so that a measure relating to a tube change can then be initiated on the machine. For this purpose, the changer 10 has determination and calculation means 16, 17 which serve to carry out the method according to the invention. The determination and calculation means 16, 17 can be provided, for example, by a processing device 15, such as a computer comprising a processor and memory.Furthermore, the processing device 15 may comprise initiation means 18, such as control commands in the form of electrical signals to the respective components concerned, in order to initiate the execution of the sleeve change.

[0050] In particular, according to Fig. 3 For example, the thread 3 must be severed in order to carry out the tube change. After the thread 3 has been severed, it is sucked away by the thread suction device 13 so that the thread 3 can be reused after the bobbin change has been completed. During and / or after the bobbin change, the position of the thread guide 5 is recorded together with the associated times so that the appropriate time can be determined again at which the thread 3 can be transferred to the tube plate 2 by means of the thread suction device 13 by means of takeover and transport. The method according to the invention thus makes it possible to ensure that the interruption of the winding process or the cycle time for the tube change can be only a few seconds.

[0051] The above explanation of the embodiments describes the present invention exclusively within the scope of examples. Of course, individual features of the embodiments can be freely combined with one another, provided they are technically feasible, without departing from the scope of the present invention. Bezugszeichenliste

[0052] 1Bobbin, spool 2Bobbin plate 3Thread 4Thread guide, thread guide rod 5Thread guide 6AFirst specified position 6BSecond specified position, end position 10Change device, changer 11Detection means 12Thread separation unit 13Thread suction device 14Thread storage unit 15Processing device 16Calculation means 17Determination means 18Initiation means 19Positioning device, guide means 20Computer program 30Means of exchange 100Procedure 101Capturing at least two points in time 102Calculating a time span 103Determining a point in time 104Initiating an action

Claims

1. A method (100) for performing a tube change by means of a changing device on a spinning machine, comprising the following steps: - detecting (101) at least two points in time at which a thread guide (5) reaches a first predetermined position (6A), wherein the thread guide (5) traverses along a thread guide guide (4), - calculating (102) a time period based on the at least two detected points in time, wherein the time period specifies a time required by the thread guide (5) to reach a second predetermined position (6B) along the thread guide guide (4) from the first predetermined position (6A), - determining (103) a point in time based on the calculated time period which is specific for the thread guide (5) reaching the second predetermined position (6B) from the first predetermined position (6A) along the thread guide guide (4),- initiating (104) an action to perform a sleeve change based on the determined time., 2. Method (100) according to claim 1, characterized in that the initiation (104) comprises the further following steps if an exchange of a wound tube with an empty tube (1) is to take place: - separating the thread (3) from the thread guide (5) in a traversing area of ​​the thread (3) at the specific time, - sucking off the separated thread (3) by a thread suction device (13), - exchanging the wound tube with the empty tube (1) by exchange means (30).

3. Method (100) according to claim 2, characterized in that the separation of the thread (3) comprises the further following step: - storing the separated thread (3) in a thread storage unit (14), in particular in a storage chamber.

4. Method (100) according to claim 1, characterized in thatthe initiation comprises the following further steps, depending on whether a wound tube has been replaced by an empty tube (1): - aligning the suction device (13) with the area of ​​a tube plate (2) holding the empty tube (1) by means of a guide means (19) depending on the specific time, - taking over and carrying along the thread (3) by the rotating tube plate (2) depending on the specific time, - taking up the thread (3) by the oscillating thread guide (5) depending on the taking over and carrying along.

5. Method (100) according to one of the preceding claims, characterized in that the second predetermined position (6B) of the oscillating thread guide (5) corresponds to a left and / or a right end position along the thread guide guide (4).

6. Method (100) according to one of the preceding claims, characterized in thatthe first predetermined position (6A) of the oscillating thread guide (5), at which the at least two points in time are detected, corresponds to a position between the center of a oscillating region of the thread guide (5) running along the thread guide guide (4) and a left or a right end position along the thread guide guide (4).

7. Method (100) according to one of the preceding claims, characterized in that the method (100) comprises the further subsequent step: - receiving the at least two detected times with respect to the first predetermined position (6A) of the thread guide (5) from a detection means (11).

8. Method (100) according to one of the preceding claims, characterized in that carrying out the sleeve change comprises a cycle time of less than 10 seconds, preferably between 3 and 5 seconds, wherein the cycle time is measured from the time of separating the thread (3) to the time of taking up the thread (3).

9. Method (100) according to one of the preceding claims, characterized in that the spinning machine is a rotor spinning machine, in particular a semi-automatic rotor spinning machine, or an air-jet spinning machine.

10. Changing device (10) for carrying out a tube change on a spinning machine, in particular according to a method according to one of the preceding claims, characterized in thatthe changing device (10) comprises the following elements: - a detection means (11) for detecting (101) at least two points in time at which a thread guide (5) reaches a first predetermined position (6A), wherein the thread guide (5) oscillates along a thread guide guide (4), - a processing device (15) comprising: - a calculation means (16) for calculating (102) a time period based on the at least two detected points in time, wherein the time period specifies a time required by the thread guide (5) to reach a second predetermined position (6B) along the thread guide guide (4) from the first predetermined position (6A), - a determination means (17) for determining (103) a point in time based on the calculated time period, which point in time is specific for the thread guide (5) reaching the second predetermined position (6B) from the first predetermined position (6A) along the thread guide guide (4),- an initiating means (18) for initiating (104) a measure for carrying out the sleeve change on the basis of the determined time., 11. Changing device (10) according to claim 10, characterized in that the changing device (10) further comprises: - a thread separating unit (12) for separating a thread (3) to be wound onto the tube, wherein the thread separating unit (12) is arranged in the region of the second predetermined position (6B), - a thread suction device (13) for sucking off the thread (3), which is designed to be positionable, in particular pivotable, and - an exchange means (30) for exchanging a wound tube with an empty tube (1).

12. A computer program (20) comprising instructions which, when the computer program (20) is executed by a change device (10), cause the change device (10) to carry out the method (100) according to one of claims 1 to 8.

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