Method for carrying out a sleeve change, changing device and computer program

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 performing a sleeve 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 for yarn production. For example, spinning machines can combine manual and automated processes, allowing operators to load the material into the machine and monitor the spinning process while the machine performs the actual spinning. Spinning machines can be used with various types of fibers to produce a wide variety of yarns, also known as thread, and are available in different configurations depending on the specific production requirements. With so-called semi-automatic spinning machines, various types of manual bobbin changes are known, depending on the type and manufacturer of the machine. For example, a thread can be manually cut by an operator and disposed of separately until a new thread is ready after the bobbin change.The yarn can be reintroduced into the winding process by the operator inserting a new spool. A disadvantage of these changes is that the cycle time for the operator to change the spool is very long, meaning that the yarn produced by the spinning machine during this time often has to be disposed of as waste.

[0003] Document DE 44 32 702 B4 discloses a method according to the preamble of claim 1.

[0004] Document EP 0 311 827 A2 discloses a method for guiding, holding and separating a thread during bobbin changes, wherein the thread is guided by a microprocessor-controlled stepper motor by means of a changing thread guide during all bobbin and bobbin change operations. Disclosure of the invention

[0005] 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, especially a rotor or air spinning machine, and in particular a semi-automatic rotor spinning machine, in which the spinning process is essentially not interrupted or the interruption is kept as short as possible.

[0006] The invention relates to a method with the features of claim 1, an exchange device with the features of claim 9, and a computer program with the features of claim 11. Further features and details of the invention will become apparent from the respective dependent claims, 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 exchange device and the computer program according to the invention, and vice versa, so that the disclosure of the individual aspects of the invention always includes, or allows for, reciprocal reference.

[0007] The invention relates in particular to a method for carrying out a sleeve change by means of a changing device on a spinning machine. The method is characterized by the following steps: Recording at least two times at which a thread guide reaches a first predetermined position, whereby the thread guide moves along a thread guide path; calculating a time interval based on the at least two recorded times, wherein the time interval specifies a time that the thread guide needs to reach a second predetermined position along the thread guide path from the first predetermined position; determining a time point based on the calculated time interval, which is specific to the fact that the thread guide reaches the second predetermined position from the first predetermined position along the thread guide path; initiating a measure to carry out a sleeve change based on the determined time point.

[0008] Determining the precise moment when the thread guide reaches the second predetermined position along the guide allows the changing unit to detach the thread from the guide at that specific time. This initiates the replacement of the fully wound spool (a so-called full spool) with an empty one. Conversely, determining this same time also enables the changing unit (also known as a changer or service unit) to align the suction device with the area of ​​a spool holder that holds the empty spool. This allows the thread to be picked up from the spool holder and the winding process to continue. Such spool holders are well known in the art.The core plate is a component of a spinning machine's winding unit, designed to hold the core to be wound so that it can rotate. For example, the core plate can have circumferentially distributed notches that form a thread-catching hook to catch and carry the thread provided in the core plate area as it rotates. This has the advantage of significantly reducing the downtime of the winding process. Synchronizing the core change with the cutting and re-laying of the thread in the changing area, based on the predetermined position of the thread guide, allows for very short downtimes of the winding process, particularly in the single-digit second range.The term "thread change range" refers to spinning machine technology and describes the area in which the yarn (the "thread") changes direction within a winding device to ensure continuous core winding and thus production. The term "thread change range" therefore describes the area in which the thread "changes." In other words, the thread change range can be understood as the stroke range of the thread guide, which is variably adjustable depending on the situation and / or production requirements.

[0009] Furthermore, it is conceivable that the initiation includes the following steps if a wound sleeve or a winding coil is to be replaced by an empty sleeve: Separation of the thread from the thread guide in a changing area of ​​the thread at the specified time, suction of the separated thread by a thread suction device, exchange of the wound sleeve for an empty sleeve by means of a replacement medium.

[0010] Cutting the thread at the specified time allows the cut thread to be extracted by the thread extraction device. Furthermore, this has the advantage that the thread is cut at the second predetermined position within the thread's changeover area at the specified time, thus enabling a faster exchange of the lead-in spool with an empty core. Additionally, cutting the thread allows it to be made available for further use during the core change.

[0011] It is also conceivable, optionally, that cutting the thread includes the following further step: Storing the separated thread in a thread storage unit, in particular in a storage chamber.

[0012] This eliminates the need to dispose of the thread as waste and further reduces production costs. Storing the thread has the advantage that it can be reused for the winding process after a spool change.

[0013] Optionally, the initiation process may include the following further steps, depending on whether a wound sleeve or a winding spool has been replaced by an empty sleeve: Aligning the suction device with the area of ​​a sleeve plate holding the empty sleeve by means of a guide device depending on the specific time, taking over and carrying the thread by the rotating sleeve plate depending on the specific time, picking up the thread by the thread guide depending on the takeover and carrying.

[0014] Aligning the suction device according to a specific time ensures that the thread is picked up by the rotating core plate at the correct moment, allowing the thread to be carried along by the rotating core plate. This allows the winding process to continue advantageously.

[0015] Within the scope of the invention, it can be provided that the second predetermined position of the changing thread guide corresponds to a left and / or a right end position along the thread guide path. This position of the thread within the thread change range or within the stroke range of the thread guide ensures effective separation and / or transfer and carrying of the thread before and / or after the core change. Furthermore, this position allows the thread to be within the effective range of the thread cutting unit, enabling it to be separated from the thread guide by the cutting unit at a specific time. After a core change, this position allows the thread extraction device to be aligned towards the nearby core plate, so that the thread can be picked up and carried along.

[0016] Within the scope of the invention, it can be provided that the first predetermined position of the changing thread guide, at which the at least two time points are recorded, corresponds to a position between the center of a changing range of the thread guide extending along the thread guide path and a left or right end position along the thread guide path. This position enables reliable detection of the direction of movement of the thread guide, particularly in the direction of the second predetermined position, solely based on the at least two recorded time points, thereby enabling reliable determination of the time and also allowing the use of a cost-effective detection means.

[0017] Alternatively, the invention may provide that the first predetermined position corresponds to the center of a changing area of ​​the thread guide extending along the thread guide path. This position is particularly advantageous for a space-saving design of the changing device by appropriately arranging a detection means for recording the at least two points in time. Furthermore, by comparing the calculated time intervals and / or points in time, it can be easily determined whether the thread guide is exposed to any influences along the thread guide path that necessitate an inspection of the thread guide and / or the thread guide path.

[0018] Alternatively, the invention may provide that the first predetermined position is identical to the second predetermined position. The agreement of the first and second positions, in conjunction with the second predetermined position corresponding to 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, thereby enabling a more reliable initiation of the action.

[0019] For example, the procedure may include the following subsequent step: Receiving at least two recorded time points in relation to the first predetermined position of the thread guide from a recording device.

[0020] This allows the changer, and in particular its processing unit, to receive at least two recorded time points, enabling the processing unit's determining and calculating means to determine and calculate the time at which the thread guide reaches the second predetermined position along the thread guide path. This has the advantage that the appropriate time relative to the second predetermined position of the thread guide can be determined to initiate the bobbin change process. The detection means can optionally be designed as an optical sensor. The transmission of the at least two recorded time points to the processing unit can be wired and / or wireless.

[0021] In another possibility, the process of changing the core can be designed to have a cycle time of less than 10 seconds, preferably between 3 and 5 seconds, where the cycle time is measured from the time the thread is cut until the time it is picked up. This has the advantage that the amount of thread produced during the core change can be kept low. Furthermore, this allows the volume of the thread storage unit to be kept small, corresponding to the respective cycle time.

[0022] Another possibility is that the spinning machine is a semi-automatic rotor spinning machine. Using a semi-automatic rotor spinning machine allows for a significant increase in production speed and efficiency compared to manual methods. This has the advantage of ensuring faster production of spinning materials. These machines can advantageously ensure more uniform rotation and tension of the spinning material, resulting in higher quality and consistency of the final products. Furthermore, such machines are often versatile and can be adapted to different spinning materials and requirements, thus increasing production flexibility.

[0023] The invention also relates to a changing device for performing a sleeve change on a spinning machine according to a preferred embodiment of the aforementioned inventive method. The changing device comprises the following elements: A detection means for recording at least two times at which a thread guide reaches a first predetermined position, wherein the thread guide moves along a thread guide guide; a processing device comprising: a calculation means for calculating a time interval based on the at least two recorded times, wherein the time interval specifies a time that the thread guide needs to reach a second predetermined position along the thread guide guide from the first predetermined position; a determination means for determining a time based on the calculated time interval, which is specific to the fact that the thread guide reaches the second predetermined position from the first predetermined position along the thread guide guide; an initiation means for initiating a measure to carry out the sleeve change based on the determined time.

[0024] The exchange device according to the invention thus offers the same advantages as have been described in detail with reference to a method according to the invention.

[0025] Optionally, it may be preferably provided that the changing device includes further components: a thread cutting unit for separating and / or cutting a thread to be wound onto the sleeve, wherein the thread cutting unit is further preferably arranged in the area of ​​the second predetermined position, a thread extraction device for extracting the thread, which is positionable, in particular pivotable, and an exchange means for replacing a wound sleeve or a winding spool with an empty sleeve.

[0026] This enables the inventive method to be carried out quickly and efficiently. The respective component of the changer can assist the changer in performing the sleeve change. The thread cutting unit can, for example, be designed as a cutting device or scissors, so that the thread can be cut, particularly at the second predetermined position. The suction device for removing a thread can be a device that serves to remove a thread efficiently and precisely from a specific location.

[0027] It can have a suction mechanism that creates a vacuum to draw in the thread and then transport it, for example, into a collecting device or a storage unit for the thread. Furthermore, the thread extraction device can have a positioning device, in particular a swiveling device, to precisely position the thread extraction device with a suction opening for thread capture and positioning. Positioning devices for precisely positioning an element are well 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 spool or lead-in spool from the winding device and replace it with an empty spool.

[0028] The invention also relates to a device for data processing, in particular a processing device, comprising means for carrying out the steps of the method according to the invention. The device according to the invention thus offers the same advantages as those described in detail with reference to a method according to the invention.

[0029] The invention also relates to a computer program, in particular a computer program product, comprising instructions which, when executed by a computer, cause the computer to execute the method according to the invention. Thus, the computer program according to the invention offers the same advantages as those described in detail with reference to a method according to the invention.

[0030] The computer can be a data processing device, for example, the device according to the invention, which executes the computer program. The computer can have at least one processor for executing the computer program. A non-volatile data storage device 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.

[0031] It is also conceivable that the computer includes at least one integrated circuit such as a microprocessor, an application-specific integrated circuit (ASIC), an application-specific standard product (ASSP), a digital signal processor (DSP), a field-programmable gate array (FPGA), or the like. The computer may also have at least one interface for data exchange, such as an Ethernet interface, an interface for LAN (Local Area Network), WLAN (Wireless Local Area Network), a system-on-a-chip (SoC), or another wireless interface such as Bluetooth or near-field communication (NFC). Furthermore, the computer may be implemented as one or more control units, i.e., also as a system of control units. The computer may, for example, also be intended to operate in a cloud and / or as a server to provide data processing for a local application via the interface.It is also possible that the computer is designed as a mobile device, such as a smartphone.

[0032] The invention can also relate to a computer-readable storage medium comprising the computer program according to the invention. The storage medium is, for example, designed as a data storage device such as a hard drive and / or 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 implemented as a computer-implemented method.

[0033] Further advantages, features, and details of the invention will become apparent from the following description, in which exemplary embodiments of the invention are described in detail with reference to the drawings. The features mentioned in the claims and in the description can each be essential to the invention individually or in any combination. The drawings show: Fig. 1 is a schematic visualization of a method according to embodiments of the invention. Fig. 2 is a schematic representation of the invention according to embodiments of the invention. Fig. 3 is a schematic overview of the invention according to embodiments of the invention.

[0034] In the following figures, identical reference numerals are used for the same technical features even for different embodiments.

[0035] In Fig. 1 A method 100 according to exemplary embodiments of the invention is shown schematically. Fig. 1 Figure 10 illustrates a method for performing a core change on a semi-automatic spinning machine using a changing device 10, according to exemplary embodiments of the invention. The method 100 comprises the following steps: In step 101, at least two time points are recorded at which a yarn guide 5 reaches a first predetermined position 6A, for example, a position between the center of a changing range of a yarn guide 5 along a yarn guide bar 4, which is designed as a yarn guide guide, and a right end position along the yarn guide bar 4, wherein the yarn guide 5 changes between a left and the right end position along the yarn guide bar 4. The combination of yarn guide 5 and yarn guide bar 4 is well known from the prior art. Alternatively, instead of being arranged on a yarn guide bar 4, the yarn guide 5 can be arranged on a yarn guide belt as a yarn guide guide in a previously known manner.The distance between the left and right end positions along the thread guide defines a change width or stroke width of the thread guide 5. The stroke width of the thread guide 5 can be set variably by program control and / or computer assistance. In step 102, a time interval is calculated based on at least two recorded time points, where the time interval specifies the time the thread guide 5 needs to reach a second predefined position 6B along the thread guide rod 4, starting from the first predefined position 6A.

[0036] In step 103, a time point is determined based on the calculated time interval, which is specific to when the thread guide 5 reaches the second predefined position 6B from the first predefined position 6A along the thread guide rod 4. In step 104, a measure to perform a sleeve change is initiated based on the determined time point.

[0037] Fig. 2 Figure 1 shows a schematic representation of the invention according to exemplary embodiments of the invention. Fig. 2 A changing device 10 according to exemplary embodiments of the invention is shown. The changing device 10 or also the changer 10 according to Fig. 2 includes, for example, a collection device 11, a thread cutting unit 12, a thread extraction device 13, a thread storage unit 14, a processing device 15, a guiding device 19, a computer program 20 and an exchange device 30.

[0038] The processing device 15 can be used in this in Fig. 2 The illustrated embodiment includes the following elements: a calculation means 16 for calculating 102 a time interval based on the at least two recorded time points, wherein the time interval specifies a time which the thread guide 5 needs to reach a second specified position 6B along the thread guide rod 4 from the first specified position 6A, a determination means 17 for determining 103 a time point on the basis of the calculated time interval, which is specific for the fact that the thread guide 5 reaches the second specified position 6B from the first specified position 6A along the thread guide rod 4, an initiation means 18 for initiating 104 a measure to carry out the sleeve change on the basis of the determined time point.

[0039] The processing device 15 can be designed as a data processing device which can carry out the method according to the invention using the means 16, 17, 18.

[0040] The detection means 11 serves to detect at least two times in time at which a thread guide 5 reaches a first predetermined position 6A, whereby the thread guide 5 moves 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 the movement and / or position of objects such as a changing thread guide 4.

[0041] 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 that is cut by the thread cutting unit 12 to no longer be used for a spinning or winding process, since the thread feed to the spool to be wound or to the winding bobbin is interrupted.

[0042] The yarn extraction device 13 is used to extract yarn. The extraction device 13 comprises a suction tube with which a yarn 3, in particular a cut yarn 3, can be extracted by means of negative pressure. The extracted yarn 3 can then be stored, for example, in the yarn storage unit 14 for later use in a spinning process. The yarn storage unit 14 can, for example, be configured as a storage chamber of the yarn changer 10 for storing the yarn 3.

[0043] Furthermore, the changer 10 can have a positioning device 19, which serves to position and align the thread extraction device 12 so that, when the thread 3 is picked up, it is carried along by the rotating sleeve plate 2. The rotation of the sleeve plate 2, which has hook-shaped catching devices, causes the thread 3 to be picked up to be caught by these devices and carried along. The positioning device 19 of the changer 10 thus ensures that the thread 3 to be picked up can be guided by the thread extraction device 13 towards and into the area of ​​the sleeve plate 2, where it is picked up. The positioning device 19 can, for example, comprise a guide plate or a guide channel along which the thread extraction device 13 can be guided.

[0044] The changer 10 in Fig. 2 The assembly further comprises exchange means 30, which serve to enable a wound sleeve or the winding spool to be exchanged for an empty sleeve 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 spool for the empty sleeve 1.

[0045] Furthermore, it shows Fig. 2 a computer program 20. The changer 10, in particular the processing device 15, can execute the method according to the invention by means of this program 20.

[0046] Fig. 3 Figure 1 shows a schematic overview of the invention according to exemplary embodiments of the invention. Fig. 3 A reel table 2 and a reel 1 or bobbin 1 of a semi-automatic spinning machine are shown. The reel table 2 can have hook-shaped catching devices on its outer circumference, which can serve to "capture" or carry along a thread 3 in order to continue the winding and spinning process.

[0047] A spinning machine can have a plurality of spinning stations and winding stations associated with the respective spinning stations. The spinning machine can, for example, be a semi-automatic rotor spinning machine. A changing device 10 or a changer 10 according to the invention can be assigned to a spinning station, which enables the spinning station to interrupt the yarn feed to the take-up bobbin during a bobbin change.

[0048] Furthermore, it shows Fig. 3 A thread guide bar 4, on and along which a thread guide 5 moves (arrow B). With regard to the thread guide 5, "moving" generally refers to the movement or back-and-forth motion of the thread guide 5 on and along the thread guide bar 4 and along the spool 1. This movement is used to guide the thread 3 evenly and to ensure that it is wound properly onto the spool 1 to be wound. The moving motion can also be used to guide the thread 3 in specific patterns or for special spinning requirements. The thread guide 5 of the spinning machine moves on and along the thread guide bar 4 to ensure that the thread 3 is wound evenly onto the take-up bobbin or spool 1. This back-and-forth motion of the thread guide 5 is used to guide the thread 3 and to ensure that it is wound evenly without becoming tangled or unevenly wound onto the spool 1 to be wound.

[0049] In Fig. 3 Furthermore, detection means 11 are shown, 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 moves on and along the thread guide rod 4 (arrow B). The first predetermined position 6A can, for example, be located between the middle of a movement range of the thread guide 5 along the thread guide rod 4, which is designed as a thread guide, and a right end position, or also a right reversal position, of the thread guide 5 along the thread guide rod 4.

[0050] Based on the first predetermined position 6A of the thread guide 5 and the at least two time points recorded therein, the thread changer 10 can determine or calculate the position or the correct time of the thread 3 or the thread guide 5 in order to cut the thread 3 at the specified time. At this specific time, according to the calculation by the thread changer 10, the thread 3 is located at a second predetermined position 6B within the changing area, which also includes the operating area of ​​the thread cutting unit 12 of the thread changer 10, so that the thread 3 can be cut. As soon as this has occurred, the thread 3 is extracted by the suitably positioned thread extraction device 13. The extracted thread 3 can then be stored, for example, in a thread storage unit 14 until the sleeve change is carried out using the exchange medium 30.In other words, the thread 3 is cut at the specified time and disposed of in the storage unit 14, i.e., stored until it is reintroduced into the winding process after the core exchange and the insertion of an empty core by the exchange device 30. Once the exchange for an empty core 1 has taken place, the thread extraction device 13 is moved into the area of ​​the core plate 2. A positioning device 19, including, for example, a guide plate, assists in guiding the thread extraction device 13 towards and into the area of ​​the rotating core plate 2 to ensure that the thread 3 is carried along by the rotating core plate 2. For this purpose, the core plate 2 can have hook-shaped retaining devices that ensure the thread 3 is carried along.

[0051] The core of the invention is the determination of a point in time based on at least two recorded points in time, which is specific to the point at which the thread guide 5 with the thread 3 reaches the second predetermined position 6B along the thread guide rod 4. Fig. 3 The second predetermined position 6B is exemplified as the right end position or right reversal position of the thread guide 5. By recording at least two time points with respect to a first predetermined position 6A, it is possible to (pre-)calculate when the changing thread guide 5 will reach the second predetermined position 6B, so that a measure regarding a sleeve change on the machine can then be initiated. For this purpose, the changer 10 has determining and calculating means 16, 17, which serve to carry out the method according to the invention. The determining and calculating 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 can include initiating means 18, such as control commands in the form of electrical signals to the respective affected components, to initiate the sleeve change.

[0052] In particular, according to Fig. 3 For example, the thread 3 is cut to allow for the core change. After the thread 3 is cut, it is extracted by the thread extraction device 13, so that the thread 3 can be reused after the core change. During and / or after the core change, the position of the thread guide 5 is recorded along with the corresponding times, so that the appropriate time can again be determined at which the thread 3 can be transferred to the core plate 2 by means of the thread extraction device 13. The method according to the invention thus makes it possible to achieve a cycle time of only a few seconds between the interruption of the winding process or the core change.

[0053] The preceding explanation of the embodiments describes the present invention exclusively by way of examples. Bezugszeichenliste

[0054] 1Spool, spool 2Spool plate 3Thread 4Thread guide, thread guide rod 5Thread guide 6AFirst preset position 6BSecond preset position, end position 10 Changer, Changer 11 Detection device 12 Thread cutting unit 13 Thread extraction device 14 Thread storage unit 15 Processing device 16 Calculation device 17 Determination device 18 Initiation device 19 Positioning device, Guide device 20 computer programs 30 Exchange agent 100 Procedure 101 Recording at least two points in time 102 Calculating a time span 103 Determining a point in time 104 Initiating a measure

Claims

1. A method (100) for carrying out a bobbin change by means of a changing device on a spinning machine, characterized by the following steps: - detecting (101) at least two points in time at which a thread carrier (5) reaches a first specified position (6A), wherein the thread carrier (5) oscillates along a thread carrier guide (4), - 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 carrier (5) requires to reach a second specified position (6B) along the thread carrier guide (4) from the first specified position (6A), - determining (103), on the basis of the calculated time period, a point in time specific to the thread carrier (5) reaching the second specified position (6B) along the thread carrier guide (4) from the first specified position (6A), - initiating (104) a measure to carry out a bobbin change on the basis of the determined point in time.

2. The method (100) according to claim 1, characterized in that the initiation (104) comprises the following further steps when a wound bobbin is to be replaced by an empty bobbin (1): - separating the thread (3) from the thread carrier (5) in an oscillating region of the thread (3) at the determined point in time, - suctioning off the separated thread (3) by means of a thread suction apparatus (13), - replacing the wound bobbin with the empty bobbin (1) using replacement means (30).

3. The 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. The method (100) according to claim 1, characterized in that the initiation comprises the following further steps depending on whether a wound bobbin has been replaced by an empty bobbin (1): - aligning the suction apparatus (13) with the region of a bobbin plate (2) holding the empty bobbin (1) by means of a guide means (19) on the basis of the determined point in time, - taking over and carrying along the thread (3) by means of the rotating bobbin plate (2) on the basis of the determined point in time, - taking up the thread (3) by means of the oscillating thread carrier (5) on the basis of the takeover and carrying along.

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

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

7. The method (100) according to any one of the preceding claims, characterized in that changing the bobbin involves a cycle time of less than 10 seconds, preferably between 3 and 5 seconds, the cycle time being measured from the time the thread (3) is separated to the time the thread (3) is taken up.

8. The method (100) according to any 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.

9. A changing device (10) for carrying out a bobbin change on a spinning machine, according to a method according to any one of the preceding claims, characterized in that the changing device (10) comprises the following elements: - a detection means (11) for detecting (101) at least two points in time at which a thread carrier (5) reaches a first specified position (6A), the thread carrier (5) oscillating along a thread carrier guide (4), - a processing device (15) comprising: - a calculation means (16) for calculating (102) a time period on the basis of the at least two detected points in time, the time period specifying a time which the thread carrier (5) requires to reach a second specified position (6B) along the thread carrier guide (4) from the first specified position (6A), - a determination means (17) for determining (103), on the basis of the calculated time period, a point in time specific to the thread carrier (5) reaching the second specified position (6B) along the thread carrier guide (4) from the first specified position (6A), - an initiation means (18) for initiating (104) a measure for carrying out the bobbin change on the basis of the determined point in time.

10. The changing device (10) according to claim 9, characterized in that the changing device (10) further comprises: - a thread separation unit (12) for separating a thread (3) to be wound onto the bobbin, the thread separation unit (12) being arranged in the region of the second specified position (6B), - a thread suction apparatus (13) for suctioning off the thread (3), which is designed to be positionable, in particular pivotable, and - a replacement means (30) for replacing a wound bobbin with an empty bobbin (1).

11. A computer program (20), comprising instructions that, when the computer program (20) is executed by a changing device (10) according to claims 9 or 10, cause this changing device to carry out the method (100) according to any one of claims 1 to 8.

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