Method for inserting yarn into spinning station of spinning machine, spinning station of spinning machine, and spinning machine

Abstract

The invention provides a method for inserting a yarn into a spinning position of a spinning machine, in particular a rotor spinning machine, comprising: picking up the yarn from the surface of a bobbin while inserting the yarn into a feeding device located at the yarn picking-up position; moving the feeding device into which the yarn is inserted from the yarn pickup position to a yarn conveying position; the yarn is cut to form yarn ends, and the yarn ends are sucked into a yarn guide pipe or an open-end spinning nozzle of a spinning position to be connected. According to the invention, the yarn can be directly conveyed to the opening of the yarn guide tube or the open-end spinning nozzle from the yarn tube only through one-time movement of the feeding device, and then the yarn is cut; the prepared yarn ends are connected directly in the yarn guide tube or the air-jet spinning nozzle by means of compressed air.

Description

TECHNICAL FIELD

[0001] The invention relates to a method for threading a yarn into a spinning position of a spinning machine, in particular a rotor spinning machine, in which method a yarn is picked from the surface of a bobbin and simultaneously inserted into a feed device located at the yarn pick-up position; the feed device with the inserted yarn is moved from the yarn pick-up position to a yarn delivery position; the yarn is cut to form a yarn end, and the yarn end is sucked into a gas flow spinning nozzle of a guide tube or a spinning position for connection. BACKGROUND

[0002] When a spinning machine is to be connected, a yarn is to be led out of a bobbin and introduced into the opening of a guide tube; in the case of an air-jet spinning machine, the yarn is to be fed to the inlet of a gas flow spinning nozzle. The yarn end inserted into the opening of the guide tube or the inlet of the spinning nozzle is withdrawn by a certain length for connection. In modern spinning machines, this process is carried out by means of a plurality of automated operating elements installed at the spinning position.

[0003] DE 102 01 533 B4 discloses an open rotor spinning machine in which each spinning position is provided with a rotatable suction nozzle and a connection mechanism for the preparation of a yarn end for spinning. After interruption of the spinning process, in order to reconnect, the suction nozzle is first rotated upward in order to find the yarn end on the bobbin, and then the suction nozzle with the sucked-in yarn end is first rotated downward and then upward. In order to position the yarn end in the area of the connection mechanism and to introduce it into the yarn path of the spinning position, the suction nozzle has to be rotated several times up and down and the yarn has to be guided to the target position by means of a plurality of guide elements.

[0004] EP 3 476 987 A1 discloses a spinning machine in which each spinning position is provided with a fixed suction nozzle and a movable yarn feeder. After interruption of the spinning process, the yarn catching contour of the yarn feeder can be moved into the interior of the suction nozzle so that the yarn end sucked in by the suction nozzle can be guided synchronously into the yarn feeder. Subsequently, the yarn feeder first feeds the yarn to an intermediate position of a yarn reset device. In this reset device, the yarn is cut and the newly generated yarn end is blown in a second step in the direction of the yarn outlet of the guide tube. However, this patent does not provide any information about the preparation of the yarn end for renewed spinning. SUMMARY

[0005] The invention is intended to provide a lossless and stable method for connecting a yarn end, as well as a corresponding spinning position and a spinning machine.

[0006] The objects of the invention are achieved by the features specified in the independent claims.

[0007] In one aspect, the application provides a method for threading a yarn into a spinning position of a spinning machine, in particular a rotor spinning machine, comprising: picking up the yarn from the surface of a bobbin and simultaneously inserting it into a feed device located at a yarn pick-up position; moving the feed device together with the inserted yarn from the yarn pick-up position to a yarn delivery position; and cutting the yarn to form a yarn end and sucking the yarn end into a guide tube or an air-jet spinning nozzle of the spinning position for threading.

[0008] The application allows the yarn to be directly delivered from the bobbin to the opening of the guide tube or the air-jet spinning nozzle by a single movement of the feed device, and then to be cut and connected in the air-jet spinning nozzle by means of compressed air.

[0009] Since the yarn is inserted into the feed device at the same time as it is picked up and is directly delivered to the opening by a single movement of the feed device, the step of returning the yarn end to the guide tube or the air-jet spinning nozzle is eliminated, ensuring reliable operation of the process. Furthermore, multiple transfers of the yarn between different operating components and multiple pick-ups by the operating components are also avoided, thus improving the reliability of the overall process, since each transfer of the yarn between two operating components can be prone to error. Furthermore, the yarn is subjected to less mechanical stress, and the quality of the yarn is improved, in particular for finer yarns. The single movement can also be interrupted briefly; furthermore, the single movement can also be a composite movement, provided that the yarn is not transferred to another operating component.

[0010] In another aspect, the application also provides a spinning machine having a plurality of spinning positions. The spinning positions can be designed as spinning positions of a rotor spinning machine or as spinning positions of an air-jet spinning machine. The spinning position comprises a winding device for winding the yarn produced in the spinning position onto a bobbin, a feed device which can be moved from a yarn pick-up position to a yarn delivery position for delivering the yarn picked up from the surface of the bobbin, and a separating device for separating the yarn to form a yarn end. Furthermore, the spinning position comprises a guide tube or an air-jet spinning nozzle to which a negative pressure can be applied for sucking in the yarn end. The spinning position can be used to carry out the method. The guide tube is provided with a negative pressure by being connected to an existing negative pressure channel of the textile machine. The same applies to the air-jet spinning nozzle of an air-jet spinning machine. Alternatively, the negative pressure in the guide tube or the air-jet spinning nozzle can also be established by means of an ejector. It is also conceivable to use a combination in which the yarn suction process is carried out exclusively by means of an ejector.

[0011] The yarn delivery position of the feeding device is directly at the opening area of the guide tube or the air spinning nozzle. Likewise, the separating device is directly at the opening area of the guide tube or the air spinning nozzle at least during the cutting of the yarn. Furthermore, the guide tube or the air spinning nozzle comprises at least one compressed air nozzle for preparing the yarn end to be connected.

[0012] The prepared yarn end can also be connected directly in the guide tube or the air spinning nozzle, so that the step of transferring the yarn end from one operating component to the next operating component can also be dispensed with at this point, and a separate yarn end preparation device is also not required. Although the delivery of the yarn end by means of a single movement of the feeding device is difficult to realize in terms of the geometry of the spinning station and the requirements for the positioning accuracy of the yarn end, and is therefore initially relatively complex, the process reliability is increased by the reduced number of steps for the delivery of the yarn end, a more gentle treatment of the yarn is achieved, and the costs are reduced, so that the above-mentioned disadvantages are offset.

[0013] In another aspect, the application also provides a spinning machine having a plurality of spinning stations.

[0014] Preferably, the yarn is picked up by a suction nozzle which is fixedly arranged on the spinning station and inserted into the feeding device. Since the suction nozzle does not need to be rotated for picking up and delivering the yarn end, it can be more easily adapted to the geometric conditions of the spinning station. At the same time, the feeding device with a fixed suction nozzle can be designed more compactly and more space-savingly than a feeding device with a rotating suction nozzle.

[0015] Therefore, the spinning station comprises a suction nozzle which is fixedly arranged on the spinning station for picking up the yarn, and which cooperates with the feeding device for simultaneously picking up the yarn and inserting the yarn into the feeding device. However, a rotatable suction nozzle can also simultaneously assume the function of the feeding device.

[0016] Preferably, the yarn is delivered from the yarn tube and / or the fixed suction nozzle to the opening of the guide tube or the air spinning nozzle by a rotational movement of the feeding device. Therefore, the feeding device is rotatably arranged on the spinning station. In this way, the yarn end can be easily and safely delivered to the opening by only one movement. However, this rotational movement can also be combined with an additional linear movement, or the feeding device can be moved in a purely linear manner or in another manner.

[0017] Preferably, the yarn is delivered from the feeding device to the opening of the guide tube or the air spinning nozzle in the form of a yarn loop. By forming a yarn loop, the yarn can be more easily picked up into the feeding device and delivered by the feeding device. At the same time, it is advantageous if the feeding device also automatically positions the yarn in the center of the spinning station.

[0018] Preferably, the feed device is moved, in particular rotated, from the yarn delivery position into the spinning position after the yarn end has been sucked into the guide tube or the air spinning nozzle. In this way, the feed device does not interfere with the yarn production during the normal spinning operation. The feed device can accordingly be moved, in particular rotated, from the yarn delivery position into the spinning position, in which the feed device is located outside the yarn path of the yarn produced at the spinning station.

[0019] Preferably, the guide tube or the air spinning nozzle is transported from the working position into the yarn receiving position before the yarn end is sucked in. For example, the cover of the rotor housing carrying the guide tube can be partially opened before the feed device is moved, in particular rotated, into the yarn delivery position, thereby moving the guide tube from the closed working position into the partially open yarn receiving position. On the one hand, this makes it possible to clean the spinning rotor and blow out the fiber ring in a known manner, and also to optimize the movement space conditions for the feed device, thereby making the layout of the spinning station more compact and avoiding the guide tube obstructing the movement of the feed device. On the other hand, it is also possible to further increase the safety of the yarn delivery. Likewise, the air spinning nozzle can also be lifted or rotated from the normal working position into the yarn receiving position in order to enable the feed device to move unhindered into the yarn delivery position and to optimize the relative position of the feed device and the air spinning nozzle for better sucking in of the yarn end. However, depending on the design and geometry of the station, it is also possible to leave the guide tube or the air spinning nozzle in the normal working position in order to receive the yarn end.

[0020] Preferably, the cover is closed before the yarn is separated and the feed device is moved, in particular rotated, into the spinning position. In this way, a sufficiently large underpressure can be established for sucking in the yarn, and the guide tube is in the normal working position at the instant when the yarn is cut and the yarn end is sucked in. Alternatively, it is also possible to cut and suck in the yarn with the cover open and then to close the cover.

[0021] Preferably, the at least one compressed air nozzle for preparing the yarn end in the spinning station is a yarn introduction nozzle, which effects or assists the sucking in of the yarn end into the guide tube or the air spinning nozzle. In any case, the yarn introduction nozzle is usually provided on the guide tube or the air spinning nozzle. If the yarn introduction nozzle is also used for preparing the yarn end, if necessary after modification, a separate yarn end preparation device can be dispensed with.

[0022] Preferably, the yarn introduction nozzle is pressurized with a pneumatic pressure which is adapted to the type of yarn during this process. As an additional or alternative option, the pressurization time of the yarn introduction nozzle can be determined depending on the type of yarn.

[0023] Preferably, the pressurization of the yarn introduction nozzle is performed in a distributed manner. Therein, in a first step the yarn is sucked in by the air flow, and in a second step the yarn end for the thread connection is prepared by the air flow.

[0024] Preferably, the spinning machine comprises a plurality of compressed air nozzles, which can be individually pressurized independently of one another or in a group- wise manner independently of one another. However, it is also possible to drive a plurality of compressed air nozzles simultaneously.

[0025] Preferably, the time sequence and the respective air pressure parameters for the pressurization of the compressed air nozzles, which are adapted and optimized for the yarn type, are stored in a data matrix in a control unit of the textile machine, for example. Preferably, further process parameters related to the yarn type are stored in the data matrix, such as the time sequence of the movements of the individual elements, for example the movement of the feed device and the possible movement of the guide tube or the air jet spinning nozzle, as well as the delivery speed of the latter and the drawing device for the return yarn. These parameters can be automatically called from the data matrix and applied at the intended production stations when producing the respective production batch.

[0026] Preferably, the at least one compressed air nozzle is connected to the guide tube in a tangential or radial manner with respect to the cross section of the guide tube and is inclined with respect to the longitudinal axis of the guide tube. This can result in a swirl flow which is advantageous for the spinning end preparation.

[0027] It is also conceivable that the guide tube or the air jet spinning nozzle is provided with a plurality of compressed air nozzles, which can be arranged at the same longitudinal coordinate and distributed in a circumferential manner. It is also conceivable that the plurality of compressed air nozzles of the guide tube or the air jet spinning nozzle are arranged at different longitudinal coordinates. Only a part of these compressed air nozzles can be used for the yarn end preparation or have a dual function, i.e. can be used both for the yarn end preparation and as yarn introduction nozzle. In this case, another part of the compressed air nozzles is designed only as yarn introduction nozzle.

[0028] Preferably, the guide tube comprises an overpressure valve. The overpressure valve preferably comprises a flap-like element which covers the exhaust port of the guide tube during the spinning operation, in particular a flap-like element made of plastic material or a stainless steel mesh. If, upon sucking in the yarn end, an excessive pressure builds up in the guide tube due to the yarn preparation or the yarn suction, the valve opens automatically and allows the excessive pressure to escape through the exhaust port. Conversely, if, after sucking in the yarn and during the spinning process, a negative pressure occurs in the guide tube, the overpressure valve closes automatically under the influence of the negative pressure and remains closed. The flap-like element is therefore preferably designed to be flexible or is arranged movably at the exhaust port.

[0029] Preferably, the separating device is fixedly arranged on the spinning position. In this way, the design of the spinning device is both simple and economical, since no drive elements for driving the separating device need to be provided.

[0030] Preferably, the separating device is arranged on the yarn testing device, in particular on a movable yarn testing device, which is also advantageous. In this way, the separating device can be arranged on the spinning unit in a simple and cost-effective manner. The yarn testing device is movable relative to the drawing device, but is stationary relative to the remainder of the spinning position. BRIEF DESCRIPTION OF DRAWINGS

[0031] Further advantages of the application will be explained in the following examples. Shown in the drawings are:

[0032] Figure 1 Fig. 1 is a front view of a spinning machine with a plurality of spinning positions arranged side by side.

[0033] Figure 2 Fig. 2 is a side view of a spinning position of the spinning machine in Fig. 1 during a spinning operation.

[0034] Figure 3 Figure 2 Fig. 3 is a schematic view of the spinning position in Fig. 2 during interruption of the spinning operation.

[0035] Figure 4 Fig. 4 is a longitudinal sectional view of a guide tube with a compressed air nozzle for preparing a yarn end. Figure 2 Fig. 5 is a schematic view of the yarn end of the spinning position in Fig. 2 being introduced into the guide tube.

[0036] Figure 5 Fig. 6 is a longitudinal sectional view of a guide tube with a compressed air nozzle for preparing a yarn end.

[0037] Figure 6 Fig. 7 is a schematic view of the yarn end of the spinning position in Fig. 2 being introduced into the guide tube.

[0038] Figure 7 Fig. 8 is a side view of a spinning position of the spinning machine in Fig. 1 during a spinning operation according to a second embodiment of the application.

[0039] Figure 8 Fig. 9 is a schematic view of the spinning position in Fig. 8 during interruption of the spinning operation. Figure 7

[0040] Fig. 10 is a schematic view of the yarn end of the spinning position in Fig. 8 being introduced into the guide tube. Figure 9 Figure 7 Fig. 11 is a side view of a spinning position of the spinning machine in Fig. 1 during a spinning operation according to a third embodiment of the application.

[0041] Figure 10

[0042] Figure 11 ​​Fig. 1 is a schematic view of a yarn guide with an air outlet for a spinning position of a spinning machine with a pressure relief valve closed.

[0043] Figure 12 Fig. 2 is a schematic view of a yarn guide with an air outlet for a spinning position of a spinning machine with a pressure relief valve open. Figure 11

[0044] Reference signs

[0045] 1 Spinning machine

[0046] 2 Spinning position

[0047] 3 Yarn

[0048] 4 Winding device

[0049] 5 Yarn tube

[0050] 6 Feeding device

[0051] 7 Yarn end

[0052] 8 Yarn guide

[0053] 9 Air jet

[0054] 10 Opening

[0055] 11 Suction nozzle

[0056] 12 Cover

[0057] 13 Separating device

[0058] 14 Compressed air nozzle

[0059] 15 Yarn introduction nozzle

[0060] 16 Covering element

[0061] 17 Longitudinal axis

[0062] 18 Yarn testing device

[0063] 19 Frame

[0064] 20 Spinning device

[0065] 21 Transport device

[0066] 22 Spinning rotor

[0067] 23 Drafting device

[0068] 24 Negative pressure channel

[0069] 25 Rotor housing

[0070] 26 Nozzle hole

[0071] ​27 first opening

[0072] 28 mouth

[0073] 30 overpressure valve

[0074] 31 sheet-like element

[0075] 32 exhaust port

[0076] 33 edge

[0077] I thread pick-up position

[0078] II thread delivery position

[0079] III spinning position DETAILED DESCRIPTION

[0080] Figure 1 is a front view of a spinning machine 1, a plurality of spinning positions 2 are arranged side by side between two machine frames 19. Each spinning position 2 has a plurality of spinning components and handling members for spinning the supplied fiber material into a thread 3. The spinning machine 1 can be designed as a rotor spinning machine or as a air-jet spinning machine. In particular, each spinning position 2 comprises a delivery device 21, a spinning device 20 and a winding device 4 for winding the produced thread 3 onto a bobbin 5. In a rotor spinning machine, the delivery device 21 comprises an opening device and a thread feeding device, the spinning device 20 is a spinning rotor 22 (see Figure 2 ); in an air-jet spinning machine, the delivery device 21 comprises a drafting device, the spinning device 20 is an air- spinning nozzle 9 (see Figure 8 ). Furthermore, each spinning position 2 is provided with a suction nozzle 11, which can be subjected to a negative pressure, in order to position the thread 3, which is accumulated on the bobbin 5, in the event of a spinning operation being interrupted.

[0081] Figure 2Figure 1 shows a side view of a spinning position 2 of a spinning machine 1 according to an embodiment of the application during a spinning operation. The delivery device 21 (here in the form of an opening device), the spinning device 20, the suction nozzle 11 and the winding device 4 are shown. According to this embodiment, the delivery device 21 is arranged in the cover element 12, which encloses the spinning device 20 (more precisely the rotor housing 25 of the spinning device 20) together with the spinning rotor cup 22 during the spinning operation. As shown by the arrow and the dashed line, the cover element 12 can be rotated downwards for opening the spinning position 2 for maintenance. The spinning rotor cup 22 is arranged rotatably in the rotor housing 25, to which a negative pressure can be applied, for producing the yarn 3. The rotor housing 25 is connected to the negative pressure channel 24. The produced yarn 3 is fed into the guide tube 8 with the opening 10, drawn off by the drawing device 23 and wound onto the bobbin 5. Since the guide tube 8 is connected to the rotor housing 25, a negative pressure also exists in the guide tube. The suction nozzle 11 is likewise connected to this or another negative pressure channel 24, but is not shown here.

[0082] In this embodiment, the suction nozzle 11 is also designed as a feeding device 6, as shown in the following figure. Furthermore, the separating device 13 is shown, which in this embodiment is stationary and arranged above the opening 10 of the guide tube 8 of the spinning position 2. In some embodiments, the separating device 13 is arranged movably on the spinning position 2 and is only moved into the region of the opening 10 of the guide tube 8 during the jointing process to cut off the yarn 3. Furthermore, a yarn testing device 18 (see Figure 5 and Figure 8 ) can also be arranged on the spinning position 2 to check the presence and quality of the produced yarn 3, but is not shown here. In some embodiments, the separating device 13 can also be arranged on the yarn testing device 18, which is arranged movably on the spinning position 2 or can also be stationary on the spinning position 2. In the spinning operation shown here, the suction nozzle 11 is in the spinning position III, outside the yarn path of the produced yarn 3. If the spinning operation at the spinning position 2 is interrupted, for example due to a yarn break or a cleaner cut, the yarn 3 (see Figure 4 ), more precisely the yarn end 7 (see Figure 4 ), is attached to the bobbin 5.

[0083] Figure 3 for Figure 2The diagram shows a scenario where spinning operation at the spinning position is interrupted. To reconnect the yarn 3, it is first necessary to locate and pick up the yarn 3 on the yarn tube 5. Therefore, the suction nozzle 11 rotates from spinning position III to yarn pickup position I. Since the suction nozzle 11 also functions as a feeding device 6, the yarn 3 is simultaneously introduced into the feeding device 6. In this way, the yarn 3 can be picked up and smoothly conveyed through the feeding device 6 without the need for transfer between the suction nozzle 11 and the feeding device 6. This also reduces the steps required to introduce the yarn 3 into the feeding device 6, thereby improving process reliability.

[0084] Figure 4 for Figure 2 The diagram shows the yarn end 7 being introduced into the yarn guide tube 8 at the spinning position. The suction nozzle 11 (also used here as the feeding device 6) rotates from the yarn pick-up position I to the yarn delivery position II. Simultaneously, as the feeding device 6 (here, the suction nozzle 11) moves to the yarn delivery position II, the yarn 3 is inserted into the traction device 23. At the yarn delivery position II, the opening 28 of the suction nozzle 11 (see...) Figure 3 (Not labeled here for clarity) is located in the opening 10 region of the yarn guide tube 8. At this time, the mouth 28 of the suction nozzle 11 is located above the opening 10 of the yarn guide tube 8 and is centered relative to it. Therefore, the suction nozzle 11 may include a center alignment element and / or a guide element for guiding the yarn 3. In this way, the yarn 3 is located at the suction nozzle 11 or the yarn delivery position II of the feeding device 6 directly above the opening 10 of the yarn guide tube 8. The yarn 3 can then be cut by the separating device 13. This produces a new yarn end 7, which is immediately sucked into the yarn guide tube due to the negative pressure in the yarn guide tube 8. Then, by, for example, briefly moving the traction device 23, the yarn 3 is fed back a certain length to pre-treat the yarn end 7 before splicing. Subsequently, the yarn end 7 can be fed back to the spinning rotor 22 in a further step. In this embodiment, the yarn intake can be achieved through an injection nozzle in the opening 10 region of the yarn guide tube 8. Therefore, with just one movement, especially a rotational movement, the yarn 3 can be picked up from the yarn tube 5 and directly conveyed to the yarn guide tube 8. This avoids multiple transfers of the yarn 3 between different processing elements and also avoids using guide elements that severely wear down the yarn to guide the yarn 3, thus ensuring that the splicing process is less prone to errors.

[0085] In the next step, at least one compressed air nozzle is used to prepare the yarn end 7 within the yarn guide tube 8. The process of preparing the yarn end 7 will be described below. Figure 5 and Figure 6 Please provide a detailed explanation.

[0086] Figure 5 A longitudinal cross-sectional view of a yarn guide tube 8 with a compressed air nozzle 14 used for preparing yarn ends 7.

[0087] Figure 6 This is a schematic cross-sectional view of the yarn guide tube 8 with compressed air nozzle 14 used for preparing the yarn end 7. The airflow spinning nozzle 9 can also adopt a similar structural design, so the following description is equally applicable.

[0088] from Figure 5 and Figure 6 As can be seen, the nozzle orifice 26 of the compressed air nozzle 14 is both inclined relative to the longitudinal axis 17 of the yarn guide tube 8 and secantly arranged relative to the cross-section of the yarn guide tube 8. This creates a correspondingly oriented air vortex within the yarn guide tube 8. This air vortex can untangle the outer fibers of the yarn end 7 and separate them from the yarn end 7, thereby forming a pointed yarn end suitable for splicing. Contrary to the illustration, the nozzle orifice 26 can also be arranged tangentially relative to the cross-section of the yarn guide tube 8.

[0089] In a preferred embodiment of the invention, the compressed air nozzle 14 for preparing the yarn end 7 also serves as the yarn inlet nozzle 15, used to convey the yarn 3 into the yarn guide tube 8 or to assist in drawing the yarn end 7 into the yarn guide tube 8. Therefore, the compressed air nozzle 14 has the dual function of conveying yarn and preparing the yarn end 7. Its advantage is that the preparation of the yarn end can be completed in one step by drawing in the yarn end 7 or receiving it from the suction nozzle 11 or the feeding device 6, without having to separately convey the yarn end to the yarn end preparation device. This helps to achieve non-destructive processing of the yarn 3, thereby improving the reliability of the process.

[0090] As described above, unlike the illustration, the yarn guide tube 8 or the airflow spinning nozzle 9 may also have multiple compressed air nozzles 14 or nozzle holes 26. For example, the multiple compressed air nozzles 14 or nozzle holes 26 of the yarn guide tube 8 or the airflow spinning nozzle 9 may be arranged at the same longitudinal coordinate and distributed on the circumference.

[0091] Multiple nozzle holes 26 of the yarn guide tube 8 or the air-flow spinning nozzle 9 can also be set at different longitudinal coordinates. Not all nozzle holes 26 need to be used for yarn end preparation.

[0092] In a preferred embodiment of the invention, the yarn guide tube 8 or the airflow spinning nozzle 9 may be replaceable or have replaceable inserts. This allows for the installation or use of the most suitable element for different types of yarn. For example, the compressed air nozzle 14 may be designed as the yarn introduction nozzle 15, or may be arranged in different ways to reverse the generated vortex direction, thereby preparing S-twist or Z-twist yarns.

[0093] In the process of preparing the yarn end 7 for the joint, the yarn 3 is clamped by the traction device 23. After the yarn end preparation, the prepared yarn end 7 can be fed back into the spinning rotor 22 (for example by briefly driving the traction device 23 in the next step) for the joint operation.

[0094] After the yarn 3 has been severed by the separating device 13, the suction nozzle 11 or the feed device 6 is moved back (in this embodiment, rotated) to the spinning position III (see Figure 2 ), on which the suction nozzle does not interfere with the yarn path of the yarn 3, which is now produced again.

[0095] Figure 7 is a side view of the spinning position 2 of the spinning machine 1 in embodiment two of the application during the spinning operation. In contrast to the embodiment shown in Figures 2 to 4 , in this embodiment, the suction nozzle 11 is fixed at the spinning position 2. The suction nozzle 11 is also connected to the negative pressure channel 24 or another negative pressure channel 24. During the spinning operation, the yarn 3 produced in the spinning device 20 enters the suction nozzle 11 through the first opening 27, passes through the suction nozzle 11 and exits the suction nozzle 11 from the mouth 28 of the suction nozzle 11, where it is finally wound onto the bobbin 5. The spinning position 2 also comprises a separate feed device 6, which cooperates with the suction nozzle 11 in order to insert the yarn 3 into the feed device 6 while picking up the yarn 3. Otherwise, the structure of the spinning position 2 is identical to the embodiment shown in Figures 2 to 4 , with the exception that in the embodiment shown in Figures 7 to 9 , the various changes described in Figures 2 to 4 can also be implemented. During the spinning operation shown here, the feed device 6 is located on the spinning position III outside the yarn path of the produced yarn 3.

[0096] Figure 8 is a schematic view of the spinning position shown in Figure 7 during interruption of the spinning operation. In order to position the yarn 3 on the bobbin 5, it is sucked into the suction nozzle 11 and inserted into the feed device 6, which has been moved (in this embodiment, rotated) from the spinning position III to the yarn pickup position I. The feed device 6 comprises a guide hole or guide hook, which extends into the interior of the suction nozzle 11 on the yarn pickup position I. The feed device 6 also comprises a cover 16, which closes the first opening 27 of the suction nozzle 11 on the yarn pickup position I. By applying a negative pressure to the suction nozzle 11 by opening a valve (not shown), the yarn on the bobbin 5 is sucked into the suction nozzle and simultaneously inserted into the feed device 6, more precisely into the guide hole or guide hook.

[0097] Figure 9 is a schematic view of the spinning position shown in Figure 7The diagram shows the yarn end 7 being introduced into the yarn guide tube 8 at spinning position 2. For this purpose, the feeding device 6 moves (in this example, rotates) from yarn pickup position 1 to yarn delivery position 2. At yarn delivery position 2, the guide hole or guide hook of the feeding device 6 is located in the opening 10 area of ​​the yarn guide tube 8. To position the yarn 3 at yarn delivery position 2 of the feeding device 6 directly above the opening 10 of the yarn guide tube 8, the guide hole or guide hook also includes a center alignment element, and, if necessary, a guide element for guiding the yarn 3. In this case, the yarn 3 is delivered to the opening 10 of the yarn guide tube 8 in the form of a loop. In this case, the loop is divided into two sections by a guide member (not shown here) arranged on spinning position 2. The front section (shown as the left side in the figure) seen from the front of the spinning device 20 forms a yarn end 7 to be joined after the yarn 3 is cut. During the transfer of the feeding device 6 to the yarn conveying position II, the yarn end 7 is introduced into the traction device 23 through the yarn guide.

[0098] At this point, if the yarn 3 is placed directly within the opening 10 area of ​​the yarn guide tube 8, it can be cut again using the separating device 13. Therefore, in this embodiment, the separating device 13 is used to separate the rear section (the right-side segment shown in the figure) directly above the yarn guide tube 8. Then, the newly formed yarn end 7 is drawn into the yarn guide tube 8 by the negative pressure in the rotor housing 25 and the yarn guide tube 8, and if necessary, by the yarn introduction nozzle 15. As mentioned earlier, unlike the illustration, the yarn end 7 can also be drawn in solely by the yarn introduction nozzle 15, while the rear section is sucked out by the suction nozzle 11 and sent for processing. Then, according to... Figures 4 to 6 The preparation and splicing processes of the yarn end 7 are performed in the manner described above. Similarly, after the yarn end 7 is sucked in, the feeding device 6 returns to the spinning position III.

[0099] like Figures 2-9 As shown, before connecting the broken yarn, the cover 12 of the rotor housing 25 carrying the yarn guide tube 8 is slightly opened by a wider gap to blow the fiber ring out of the spinning rotor 22, preferably before the feeding device 6 moves to the yarn delivery position II. This optimizes time and saves space for the suction nozzle 11 or the feeding device 6, allowing the mouth 28 of the suction nozzle 11 or the yarn guide hole or guide hook of the feeding device 6 to be placed closer to the opening 10 of the yarn guide tube 8 at the yarn delivery position II. By slightly opening the cover 12, the yarn guide tube 8 with the opening 10 can be moved out of the rotation path of the suction nozzle 11 or the feeding device 6. In this way, the suction nozzle 11 or the feeding device 6 can be positioned at a smaller distance from the opening 10 at the spinning position 2. Before yarn separation, the cover 12 is closed, and the suction nozzle 11 or the feeding device 6 is in the yarn delivery position II. Then, the suction nozzle 11 or the feeding device 6 moves to the spinning position III.

[0100] Figure 10 is a side view of the spinning position 2 of the spinning machine 1 according to embodiment three during a spinning operation. As in the previous embodiments, the spinning position 2 comprises a yarn testing device 18 and a yarn end picking device 6. The yarn testing device 18 is arranged on a guide device 23, which is movable relative to the spinning position 2. The yarn end picking device 6 is arranged on a feed device 21, which is movable relative to the guide device 23. Figures 2 to 4 and Figures 7 to 9 Unlike the previous embodiments, the spinning device 20 is designed as an air-jet spinning device comprising an air-jet spinning nozzle 9. The spinning position 2 comprises a drafting device as a feed device 21. Furthermore, according to the illustration, a separating device 13 is arranged on the yarn testing device 18, which is movable relative to the guide device 23, but is stationary relative to the rest of the spinning position 2. The air-jet spinning nozzle 9 is similar to the previously shown guide tube 8 with an opening 10 for sucking in the yarn end 7. Likewise, a negative pressure can be applied to the air-jet spinning nozzle 9 via a negative pressure channel 24. In order to feed the yarn 7 to the opening 10 of the air-jet spinning nozzle 9 after an interruption in the spinning process, the feed device 6 has to be rotated first into the yarn end picking position I. The subsequent course is as described in Figures 7 to 9 , the yarn is then fed directly to the opening 10 of the air-jet spinning nozzle 9. It is understood that the spinning position 2 with the air-jet spinning device can also use a suction nozzle 11, as shown in Figures 2 to 4 , which simultaneously assumes the function of the feed device 6.

[0101] The prepared yarn end 7 is spliced directly in the air-jet spinning nozzle 9 with the aid of compressed air. The air-jet spinning nozzle 9 therefore comprises a compressed air nozzle 14, which is not shown here. The arrangement of the nozzle holes 26 (also not shown) of the compressed air nozzle 14 is similar to that shown in Figure 5 and Figure 6 , which is inclined relative to the longitudinal axis 17 of the air-jet spinning nozzle 9 and the openings of the nozzle holes 26 are tangential to the cross section of the air-jet spinning nozzle 9. The compressed air nozzle 14 can also be designed as a yarn introduction nozzle 15.

[0102] Figure 11 and Figure 12 is a side view of the guide tube 8 of the spinning position 2 of the spinning machine 1. The guide tube 8 comprises an overpressure valve 30. The overpressure valve 30 comprises a flake-like element 31, which is movably mounted on the guide tube 8, which can close or open a gas outlet 32 of the guide tube 8.

[0103] Figure 11The overpressure valve 30 is shown in the closed state. The flap-like element 31 covers the air outlet 32. The flap-like element can be, for example, a flexible thin plastic sheet, only the upper edge 33 of which is fixed to the guide tube 8, in particular at the air outlet 32. The plastic sheet can be fixed, for example, with screws, rivets or glue. A detachable form-fit connection can also be used, in which the edge of the plastic sheet is inserted into a corresponding slot in the guide tube. The upper edge 33 thus forms a kind of hinge. During the spinning operation shown here, the guide tube 8 is under negative pressure. This negative pressure ensures that the flap-like element 31 is automatically drawn onto the air outlet 32 and covers it, thus ensuring reliable suction of the thread end 7.

[0104] Figure 12 The overpressure valve 30 in the open state in the guide tube is shown. Outside the spinning operation, overpressure can occur in the guide tube 8 if compressed air is introduced into the guide tube 8 by means of one or more compressed air nozzles 14 or by means of one or more thread introduction nozzles 15 in order to prepare the thread end. In this case, the overpressure in the guide tube 8 automatically lifts the lower part of the flap-like element 31 out of the guide tube 8, thus opening the overpressure valve 30 and allowing the excess pressure to escape through the overpressure valve 30. In addition to the thin plastic sheet, which is usually made of a flexible plastic material such as silicone, it is also possible to use a flap-like material made of a fine stainless steel mesh.

[0105] The application is not limited to the embodiments shown and described, but can be modified within the scope of the patent claims.

Claims

1. A method of threading a yarn (3) into a spinning machine (1), comprising: picking up a thread (3) from the surface of a bobbin (5) and simultaneously inserting said thread (3) into a feed device (6) located at a thread picking position (I); moving said feed device (6) with said thread (3) inserted into it from said thread picking position (I) to a thread delivery position (II); cutting said thread (3) to form a thread end (7) and sucking said thread end (7) into a guide tube (8) or an air-jet spinning nozzle (9) of a spinning position (2) for connection; characterized in that said thread (3) is delivered directly from said bobbin (5) to the opening (10) of said guide tube (8) or said air-jet spinning nozzle (9) by a single movement of said feed device (6), then cut and the prepared thread end (7) is connected directly in said guide tube (8) or said air-jet spinning nozzle (9) by means of compressed air.

2. The method of claim 1, wherein, said thread (3) is picked up by a suction nozzle (11) fixedly arranged on said spinning position (2) and simultaneously inserted into said feed device (6).

3. The method of claim 2, wherein, said thread (3) is delivered from said bobbin (5) and / or said fixed suction nozzle (11) to the opening (10) of said guide tube (8) or said air-jet spinning nozzle (9) by a rotational movement of said feed device (6).

4. The method of claim 1, wherein, said thread (3) is delivered by said feed device (6) to the opening (10) of said guide tube (8) or said air-jet spinning nozzle (9) to form a thread loop.

5. The method of claim 1, wherein, After sucking said thread end (7) into said guide tube (8) or said air-jet spinning nozzle (9), said feed device (6) is moved to a spinning position (III) at which said feed device (6) is located outside the thread path of the thread (3) produced by said spinning position (2).

6. The method of claim 5, wherein, Before sucking said thread end (7) into said guide tube (8) or said air-jet spinning nozzle (9), said guide tube (8) or said air-jet spinning nozzle (9) is moved from an operating position to a thread receiving position; before said feed device (6) is moved to said thread delivery position (II), a cover element (12) of a rotor housing (25) carrying said guide tube (8) is partially opened, and / or before cutting said thread (3) and moving said feed device (6) to said spinning position (III), said cover element (12) is closed.

7. A spinning position (2) of a spinning machine (1) which can be used to carry out the method according to any one of claims 1 to 6, comprising: a winding device (4) for winding a thread (3) produced by said spinning position (2) onto a bobbin (5); a feed device (6) which can be moved from a thread picking position (I) to a thread delivery position (II) for delivering a thread (3) picked up from the surface of said bobbin (5); a separating device (13) for separating said thread (3) to form a thread end (7); and a suction nozzle (11) fixedly arranged on said spinning position (2) for picking up said thread (3) and simultaneously inserting said thread (3) into said feed device (6). a yarn guide tube (8) or an air jet spinning nozzle (9) which can be subjected to negative pressure and which is used to draw in the yarn end (7); characterized in that the yarn delivery position (II) of the feed device (6) is located directly in the region of an opening (10) of the yarn guide tube (8) or the air jet spinning nozzle (9); the separating device (13) is located directly in the region of the opening (10) of the yarn guide tube (8) or the air jet spinning nozzle (9) at least during the separation of the yarn (3); and the yarn guide tube (8) or the air jet spinning nozzle (9) comprises at least one compressed air jet (14) for preparing the yarn end (7) to be connected.

8. Spinning station (2) according to claim 7, characterized in that The spinning position (2) further comprises a suction nozzle (11) which is fixedly arranged on the spinning position (2) for picking up the yarn (3), which suction nozzle cooperates with the feed device (6) to simultaneously pick up the yarn (3) and insert the yarn (3) into the feed device (6).

9. Spinning station (2) according to claim 7, characterized in that The at least one compressed air jet (14) for preparing the yarn end (7) is a yarn introduction jet (15) which carries out or assists in carrying out the operation of drawing the yarn end (7) into the yarn guide tube (8) or the air jet spinning nozzle (9).

10. Spinning station (2) according to claim 7, characterized in that The at least one compressed air jet (14) communicates with the yarn guide tube (8) in tangential or radial fashion with respect to the cross section of the yarn guide tube (8) and is inclined with respect to the longitudinal axis of the yarn guide tube (8).

11. Spinning station (2) according to claim 7, characterized in that The yarn guide tube (8) comprises an overpressure valve (30) which comprises a lamellar element (31) which covers a gas outlet (32) of the yarn guide tube (8) at least during the spinning operation, the lamellar element (31) being made of a plastic material or a stainless steel mesh.

12. Spinning position (2) according to claim 7, characterized in that The separating device (13) is fixedly arranged on the spinning position (2) and / or the separating device (13) is arranged on a movable yarn testing device (18).

13. Spinning position (2) according to claim 7, characterized in that The feed device (6) is rotatably arranged on the spinning position (2).

14. Spinning position (2) according to claim 7, characterized in that The feed device (6) can be further moved or rotated from the yarn delivery position (II) to a spinning position (III) on which the feed device (6) is located outside the yarn path of the yarn (3) produced by the spinning position (2).

15. Spinning machine (1) comprising a plurality of spinning positions according to any one of claims 8 to 14 arranged side by side.

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