Feeding device and method for collecting and guiding synthetic threads extruded from a spinning device

Abstract

The present disclosure relates to a feeding device (1) with a suction gun (2) for collecting synthetic threads (4) extruded from a spinning device (3), and with a thread collecting device (5) for collecting and feeding the threads (4) to a winding device (6) for winding the threads (4), wherein the threads (4) can be guided through a thread shaft (7) arranged between the spinning device (3) and the winding device (6) by means of the thread collecting device (5), wherein the suction gun (2) is movably positioned between the spinning device (3) and an inlet (7.E) of the thread shaft (7). The present disclosure further relates to a method for collecting and guiding synthetic threads (4) extruded from a spinning device (3), which method can be carried out in particular with a feeding device (1) as described above.

Description

[0001] The present disclosure relates to a feeding device. The present disclosure further relates to a method for collecting and guiding synthetic threads extruded from a spinning device, which method can be carried out in particular with such a feeding device.

[0002] The synthetic threads extruded from the spinning device are guided through a thread shaft to a winding device. The winding device then winds the threads into bobbins. In such a spinning device, the freshly extruded threads must be guided from the spinning device, in particular from the spinning device's spinnerets, to the winding device in a so-called dispensing process so that the threads can then be wound onto the bobbins by the winding device. A plastic melt flows through the nozzle holes of the spinneret and then enters the space between the spinneret and the winding device. The area adjacent to the spinneret is also referred to as the spin-out area.The area adjacent to the winding device is also referred to as the take-up area, where the threads are transported from the spinning area to the take-up area during the tucking process. During the tucking process, the threads can be transported manually, i.e. by an operator, from the spinning area to the take-up area. For example, the operator in the spinning area forms a ball of these threads and throws this ball to the take-up area, where another operator, for example, takes up the ball, in particular separates the threads, and feeds the threads to the winding device. This manual feeding of the threads from the spinning device to the winding device requires a relatively high level of personnel deployment as well as a great deal of experience and manual skill on the part of the respective operators. This can lead to unwanted snagging or tearing of the threads, particularly when inexperienced operators are involved.The respective feeding and application process must then be repeated, which involves considerable time and operator effort. This also results in high material waste.

[0003] Furthermore, suction guns are generally known, for example from DE 10 2005 031 279 A1, DE 10 2013 018 012 A1, DE 10 2019 004 674 A1, and DE 10 2021 002 710 A1. These guns are used to collect the extruded threads in the receiving area during the application process, so that the threads can then be applied to process units such as godets and / or thread guides arranged upstream of the winding device, as well as to the winding device itself, using the suction gun. Thus, such suction guns are designed to be mobile and can be guided by an operator or an automated operating system.

[0004] The present invention is based on the object of providing a tuyere device and a method for collecting and guiding synthetic threads extruded from a spinning device that reduce or eliminate the problems of the prior art. In particular, the operating effort and operational reliability of the tuyere process, especially for guiding threads from the spinning device to the winding device, are to be reduced, while simultaneously simplifying the tuyere process.

[0005] This object is achieved by a device according to claim 1.

[0006] Further advantageous embodiments are the subject of the subclaims.

[0007] More specifically, the object is achieved by a feeding device with a suction gun for collecting synthetic threads extruded from a spinning device and with a thread collecting device for collecting and feeding the threads to a winding device for winding the threads, wherein the threads can be guided through a thread shaft arranged between the spinning device and the winding device by means of the thread collecting device, wherein the suction gun is movably positioned between the spinning device and an inlet of the thread shaft.

[0008] In particular, a suction mouth of the suction gun is movably positioned between the spinning device and the entrance to the thread shaft. The suction gun is movably positioned, in particular, between the spinning device and the entrance to the thread shaft for collecting and feeding the threads to the thread collecting device. The suction gun is movably positioned, in particular, between the spinning device and the thread collecting device for collecting and feeding the threads to the thread collecting device. The suction gun is positioned, in particular, between the spinning device and a suction mouth of the thread collecting device. Thus, in the application process, the threads can first be collected with the suction gun after they have left the spinning device. The threads are removed by means of the suction gun and stretched in the process.Because they are already stretched, the threads can then be easily fed to the thread collecting device and then easily guided through the thread shaft by means of the thread collecting device. The movable positioning of the suction gun between the spinning device and the entrance to the thread shaft ensures that the desired high degree of stretching of the threads is achieved and that the threads can still be easily fed from the suction gun to the thread collecting device. In particular, a preferably automatic transfer from the thread collecting device to a further, second suction gun is easily possible. The second suction gun is arranged in a transfer position for this transfer in a receiving area formed adjacent to the winding device.This additional, second suction gun then enables the threads to be applied to the winding device and also to process units upstream of the winding device, such as godets and / or thread guides. By stretching the threads using the suction gun before feeding them to the thread collecting device, it is successfully avoided that threads with an excessively thick diameter or clumped threads are fed to the thread collecting device. Overall, the application device reduces the operating effort and operational reliability for the application process, in particular for guiding threads from the spinning device to the winding device, and at the same time simplifies the application process. The area adjacent to the spinning device is also referred to as the spin-out area.An operator can carry out all activities to be carried out in the spinning area from a platform arranged at a distance from the spinning device, in particular below the spinning device. Such activities include, for example, cleaning the spinning device, but also collecting the threads using the suction gun and feeding the threads from the suction gun to the thread collecting device. The spinning area is formed in particular between the platform and the spinning device. The suction gun is thus positioned so as to be movable, in particular in the spinning area and / or adjacent to the spinning area. The thread shaft preferably extends from the spinning area in the direction of the winding device. The thread shaft preferably extends from the said platform in the direction of the winding device. In particular, the entrance to the thread shaft is arranged and / or formed in the region of this platform.Preferably, the suction gun is movably positioned between a first plane, in which the threads leave the spinning device, and a second plane, in which the entrance of the thread shaft is located. The first and second planes are preferably each oriented substantially horizontally. In particular, the suction gun is movably positioned between the first plane and a third plane, in which an opening of the thread collecting device facing the spinning device is located. The third plane is also preferably oriented substantially horizontally.

[0009] The thread collecting device is advantageously coupled to a compressed air supply. The threads can be fed to the winding device using compressed air provided by the compressed air supply. The suction gun can be pressurized with the compressed air provided by the compressed air supply via the thread collecting device. Thus, only one compressed air supply is required for the thread collecting device and the suction gun. The coupling of the thread collecting device to the compressed air supply preferably takes place in the receiving area adjacent to the winding device. The compressed air can then be fed from the receiving area to the suction gun positioned between the spinning device and the entrance to the thread shaft via the thread collecting device.

[0010] The thread collecting device preferably further comprises a thread collecting channel, a compressed air channel, and a nozzle. The compressed air channel is coupled to the compressed air supply. The nozzle can be pressurized with the compressed air provided by the compressed air supply via the compressed air channel. The compressed air can be introduced into the thread collecting channel in the direction of the winding device by means of the nozzle to guide the threads through the thread collecting channel in the direction of the winding device.

[0011] Within the yarn collecting channel, an air flow generated by the compressed air leads in the direction of the winding device. The nozzle is preferably arranged and / or formed at an end of the yarn collecting device facing away from the winding device, in particular in the spinning area. This has the advantage that the air flow in the yarn collecting channel has the greatest energy / mass flow at the end at which the yarns enter the yarn collecting device during operation of the yarn collecting device, in particular at the end of the yarn collecting device facing away from the winding device, so that the yarns in the yarn collecting channel are accelerated most strongly by the air flow at this end of the yarn collecting device.The air flow can preferably be fed to the thread collecting device at the end at which the threads are led out of the thread collecting device during operation of the thread collecting device, in particular at an end of the thread collecting device facing the winding device.

[0012] The suction gun is preferably coupled to a connection of the compressed air channel and / or the nozzle by means of a coupling device. The connection is arranged in a spinning-out region of the spinning device formed adjacent to the spinning device. This allows the suction gun to be coupled to the connection of the compressed air channel and / or the nozzle for the application process and for the suction gun to be decoupled from the connection of the compressed air channel and / or the nozzle for the regular operation of the spinning device and the winding device. The regular operation of the spinning device and the winding device is thus not disrupted by the suction gun.

[0013] It can be advantageous if the suction gun with the coupling device can be coupled to different connections of the respective compressed air duct and / or the respective nozzle, each arranged in a spinning area of ​​different spinning devices. Usually, several spinning devices are arranged next to one another in a factory. One and the same suction gun can then always be used on the spinning device on which the application process is to be carried out. It is therefore sufficient to provide only a single suction gun for a certain number of spinning devices, since the application process cannot usually be carried out on two or more of this number of spinning devices at the same time. On the above-mentioned platform, an operator can then preferably move back and forth between the various spinning devices. One platform is preferably provided for several spinning devices.Preferably, a first floor is formed by means of the platform, wherein the winding device or the winding devices are arranged on a floor.

[0014] In a preferred embodiment of the application device, the coupling device is arranged and / or formed at one end of a movable hose of the suction gun. This facilitates the positioning of the suction gun between the spinning device and the entrance of the yarn shaft and the coupling of the coupling device to the connection. The coupling of the coupling device is enabled at various relative positions of the suction gun to the yarn collecting device by the movable hose, depending on the length and flexibility of the hose.

[0015] In a particularly preferred embodiment of the application device, the suction gun is coupled to a mobile container into which the threads collected by the suction gun can be removed. Preferably, the threads can then be recycled from the container after the application process. The container also ensures that the threads collected by the suction gun do not move uncontrollably in the area of ​​the spinning device and the unwinding device after collection, which could lead to disruptions in their operation.

[0016] The object underlying the invention is also achieved by a method for collecting and guiding synthetic threads extruded from a spinning device according to claim 8.

[0017] More specifically, the object is then achieved by a method for collecting and guiding synthetic threads extruded from a spinning device, which can be carried out in particular with a feeding device as described above, wherein the following steps are preferably carried out in the order mentioned: • a suction gun of the application device is positioned between the spinning device and an entrance of a thread shaft arranged between the spinning device and a winding device; • the synthetic threads extruded from the spinning device are collected using the suction gun; • the threads collected with the suction gun are guided to a thread collecting device of the application device and transferred to the thread collecting device; • The threads are guided through the thread shaft and to the winding device using the thread collecting device.

[0018] This multitude of steps can be performed by just one operator. Overall, the method can be carried out with minimal effort and high reliability for the application process, particularly for guiding threads from the spinning device to the winding device. The suction gun is preferably positioned by the operator in the desired position. In particular, the suction gun is supported on the platform arranged at a distance from the spinning device and / or held by the operator. After the threads have left the spinning device, the threads are preferably fed manually by the operator to the suction gun and thus collected.

[0019] Advantageously, the threads are guided individually from the suction gun to the thread collecting device and transferred to the thread collecting device. However, it is also conceivable to guide two or more threads, in particular all of them, extruded by the spinning device from the suction gun to the thread collecting device simultaneously.

[0020] More preferably, the threads break upon transfer to the thread collecting device, particularly due to the suction forces acting on the threads from the thread collecting device and the suction gun. After breaking, the threads extruded by the spinning device are then guided toward the winding device by the thread collecting device. If the threads are guided individually from the suction gun to the thread collecting device, the suction force of the thread collecting device acts only on this single thread, ensuring particularly reliable breakage.

[0021] According to an advantageous embodiment of the method, the threads are severed using scissors or a knife upon transfer to the thread collecting device. Such scissors or a knife can be carried by the operator and / or arranged and / or formed on the thread collecting device and / or the suction gun. The scissors or knife enable particularly fast and reliable cutting.

[0022] Preferably, the threads are guided from the suction gun to the thread collection device by means of a thread guide hook and / or by an operator's hand and transferred to the thread collection device. The thread guide hook enables particularly controlled guidance of the threads.

[0023] The aforementioned application device is, in particular, part of a melt spinning system for producing partially or fully drawn synthetic threads for textile or technical applications. The method for collecting and guiding synthetic threads extruded from a spinning device is then, in particular, part of a process for applying the threads to such a melt spinning system for producing partially or fully drawn synthetic threads for textile or technical applications.

[0024] In the following, preferred embodiments are presented in more detail with reference to the attached figures. Fig. Figure 1 schematically shows an embodiment of the application device in a side view at a specific time of a method for collecting and guiding synthetic threads extruded from a spinning device. Fig. 2 shows schematically the embodiment of the application device in a side view to a, in contrast to the Fig. 1, the subsequent point in time of the process for collecting and guiding synthetic threads extruded from the spinning device. Fig. 3 shows schematically the embodiment of the application device in a side view to a, in contrast to the Fig. 2, the subsequent point in time of the process for collecting and guiding synthetic threads extruded from the spinning device.

[0025] The mooring device 1 according to the Fig. 1 to 3 has, among other things, a suction gun 2 for collecting synthetic threads 4 extruded from a spinning device 3 and a thread collecting device 5 for collecting and feeding the threads 4 to a winding device 6 for winding the threads 4. The threads 4 can be guided by means of the thread collecting device 5 through a thread shaft 7 arranged between the spinning device 3 and the winding device 6. The suction gun 2 is movably positioned between the spinning device 3 and an inlet 7.E of the thread shaft 7.

[0026] The spinning device 3 has a plurality of spinnerets, preferably arranged in a row, by means of which a multifilament synthetic thread 4 can be extruded. The thread collecting device 5 is arranged penetrating the thread shaft 7. The thread collecting device 5 is arranged in a corner region of the thread shaft 7, which preferably has a rectangular cross-section.

[0027] The thread collecting device 5 is coupled to a compressed air supply 8. The threads 4 can be fed to the winding device 6 by means of compressed air provided by the compressed air supply 8. The suction gun 2 can be pressurized via the thread collecting device 5 with the compressed air provided by the compressed air supply 8. The compressed air supply 8 has, for example, a compressor and / or pressure accumulator (not shown here), which is connected to the thread collecting device 5 by means of corresponding lines.

[0028] The thread collecting device 5 has a thread collecting channel, a compressed air channel, and a nozzle 9. The compressed air channel is coupled to the compressed air supply 8. The nozzle 9 can be pressurized via the compressed air channel with the compressed air provided by the compressed air supply 8. By means of the nozzle 9, the compressed air can be introduced into the thread collecting channel in the direction of the winding device 6 for guiding the threads 4 through the thread collecting channel in the direction of the winding device 6.

[0029] The compressed air supply 8 is arranged in a receiving area B adjacent to the winding device 6 A coupled to the compressed air channel. The nozzle 9 is located at an end of the yarn collecting device 5 facing away from the winding device 6, in particular in a spinning area B formed adjacent to the spinning device 3 Sthe spinning device 3. The thread collecting device 5 has a wall for forming the thread collecting channel and the compressed air channel. The wall thus fulfills a dual function, namely forming both the thread collecting channel and the compressed air channel, so that overall, particularly few components are required to form the thread collecting device 5. The compressed air channel is positioned at least partially parallel to the thread collecting channel and / or the compressed air channel and the thread collecting channel have essentially the same length.

[0030] The suction gun 2 can be coupled to a connection 11 of the compressed air channel and / or the nozzle 9 by means of a coupling device 10. The connection 11 is arranged in a spinning area B adjacent to the spinning device 3. S of the spinning device 3. In and / or adjacent to the spinning area B SA cooling air supply 14 is arranged, by means of which cooling air can be supplied to the threads 4 radially and / or in a cross-flow. The cooling air supply 14 is arranged between the spinning device 3 and the thread shaft 7. The inlet 7.E of the thread shaft 7 thus faces the cooling air supply 14 and / or the spinning device 3. A platform 15 is arranged at a certain distance from the spinning device 3, in particular below the spinning device 3, such that an operator can access all in the spinning area B Scan carry out the activities to be carried out from this platform 15. The connection 11, for example, is accessible to the operator from this platform 15. The cooling air supply 14 has, in particular, a door (not shown here), which can be opened and closed, wherein the door can be opened, in particular, for collecting the threads 4 by means of the suction gun 2, so that the threads 4 can be guided through the door opening from the spinning device 3 to the suction gun 2. The threads 4 can then be guided from the suction gun 2 through the door opening to the thread collecting device 5. In the closed state of such a door, a channel essentially open only to the winding device 6 is formed by means of the cooling air supply 14 and the thread shaft 7, so that, in particular, the thread collecting device 5 in the spinning area B S is not accessible from outside this channel. Towards the winding device 6, especially in the receiving area B A, the thread collecting device 5 protrudes from the thread shaft 7.

[0031] The suction gun 2 is connected to the coupling device 10 with various, each in a spinning area B S can be coupled to the connections 11 of the respective compressed air channel and / or the respective nozzle 9 arranged on different spinning devices 3. The connections 11 of the different spinning devices 3 are of identical construction. A single suction gun 2 can then be used to collect and feed the threads 4 extruded by means of different spinning devices 3 to the thread collecting devices 5 of different spinning devices 3, namely in particular when the threads 4 are to be applied to one of the different spinning devices 3.

[0032] The coupling device 10 is arranged and / or formed at one end of a movable hose 12 of the suction gun 2. In the coupled state, the hose 12 is arranged, in particular, to penetrate the aforementioned door opening. The suction gun 2 is coupled to a mobile container 13, into which the threads 4 collected by the suction gun 2 can be discharged.

[0033] Based on the Fig. 1 to 3, a method for collecting and guiding synthetic threads 4 extruded from the spinning device 3 is now described, which can be carried out in particular with the application device 1 described above. Fig. Figures 1 to 3 illustrate successive stages of this process. The process comprises the following steps, which are preferably performed in the order mentioned: • a suction gun 2 of the application device 1 is positioned between the spinning device 3 and the inlet 7.E of the thread shaft 7 arranged between the spinning device 3 and the winding device 6; • the synthetic threads 4 extruded from the spinning device 3 are collected by means of the suction gun 2; • the threads 4 collected with the suction gun 2 are guided to the thread collecting device 5 and transferred to the thread collecting device 5; • the threads 4 are guided through the thread shaft 7 and to the winding device 6 by means of the thread collecting device 5.

[0034] Fig. 1 shows the time when the threads 4 are collected by the suction gun 2 and discharged into the container 13. Previously, the suction gun 2 was connected to the connection 11 by means of the coupling device 10, so that the suction gun 2 is pressurized with compressed air from the compressed air supply 8 to collect the threads 4. The compressed air generates a suction flow at a suction opening of the suction gun 2. The threads 4 are transferred from the suction gun 2 to the thread collecting device 5 in an at least partially drawn state, with the drawing occurring precisely through suction by the suction gun 2.

[0035] The threads 4 are guided individually from the suction gun 2 to the thread collecting device 5 and transferred to the thread collecting device 5. Fig. 2 shows the time when five of the eight threads 4 shown here are collected by the suction gun 2 and discharged into the container 13. Three of the eight threads 4 shown here are Fig. 2 is already guided through the thread shaft 7 by means of the thread collecting device 5 and to the winding device 6. Fig. 3 shows the time when all threads 4 shown here are guided through the thread shaft 7 and to the winding device 6 by means of the thread collecting device 5.

[0036] The threads 4 break when transferred to the thread collecting device 5, in particular due to the suction forces acting on the threads 4 from the thread collecting device 5 and the suction gun 2. The flow channels of the suction gun 2 and the thread collecting device 5 are dimensioned accordingly for this purpose, and a correspondingly high air pressure is provided by the compressed air supply 8. After breaking, the section of the threads 4 coming from the spinning device 3 is guided to the winding device 6 by the thread collecting device 5. The section of the threads 4 facing away from the spinning device 3, namely one thread end, is carried away by the suction gun 2, in particular until this thread end is completely located in the container 13.

[0037] The threads 4 can also be cut by means of scissors or a knife when being transferred to the thread collecting device 5.

[0038] The threads 4 are guided from the suction gun 2 to the thread collecting device 5 by means of a yarn guide hook and / or by means of an operator's hand and are transferred to the thread collecting device 5.

[0039] The threads 4 are transferred from the thread collecting device 5, in particular its thread collecting channel, adjacent to the winding device 6 to a further, second suction gun (not shown here). This second suction gun (not shown here) could protrude into the thread collecting channel for this transfer, wherein in particular a suction mouth of the second suction gun is enclosed by a wall of the thread collecting device 5. Once all the threads 4 have been sucked off by means of this second suction gun, the threads 4 can preferably be applied together to the winding device 6, in particular to godets and / or thread guides of the winding device 6 (not shown here), by appropriately moving the second suction gun. The application process is then completed, and the threads 4 extruded by means of the spinning device 3 can be wound into bobbins using the winding device 6. List of reference symbols 1 mooring device 2 suction guns 3 spinning device 4 threads 5 Thread collecting device 6 winding device 7 Thread shaft 7.E Entrance of the thread shaft 7 8 Compressed air supply 9 Nozzle 10 Coupling device 11 Connection 12 hose 13 containers 14 Cooling air supply 15 Platform B S Spinning area B A Recording area QUOTES CONTAINED IN THE DESCRIPTION

[0000] This list of documents submitted by the applicant was generated automatically and is included solely for the convenience of the reader. This list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions. Cited patent literature

[0000] DE 10 2005 031 279 A1

[0003] DE 10 2013 018 012 A1

[0003] DE 10 2019 004 674 A1

[0003] DE 10 2021 002 710 A1

[0003]

Claims

[1] Feeding device (1) with a suction gun (2) for collecting synthetic threads (4) extruded from a spinning device (3) and with a thread collecting device (5) for collecting and feeding the threads (4) to a winding device (6) for winding the threads (4), wherein the threads (4) can be guided by means of the thread collecting device (5) through a thread shaft (7) arranged between the spinning device (3) and the winding device (6), wherein the suction gun (2) is movably positioned between the spinning device (3) and an inlet (7.E) of the thread shaft (7). [2] Attachment device (1) according to claim 1, characterized bythat the thread collecting device (5) is coupled to a compressed air supply (8), wherein the threads (4) can be fed to the winding device (6) by means of compressed air provided by the compressed air supply (8), wherein the suction gun (2) can be pressurized with the compressed air provided by the compressed air supply (8) via the thread collecting device (5). [3] Attachment device (1) according to claim 1 or 2, characterized by that the thread collecting device (5) has a thread collecting channel, a compressed air channel and a nozzle (9), wherein the compressed air channel is coupled to the compressed air supply (8), wherein the nozzle (9) can be pressurized via the compressed air channel with the compressed air provided by the compressed air supply (8), wherein by means of the nozzle (9) the compressed air can be introduced into the thread collecting channel in the direction of the winding device (6) for guiding the threads (4) through the thread collecting channel in the direction of the winding device (6). [4] Attachment device (1) according to at least one of the preceding claims, characterized by that the suction gun (2) can be coupled to a connection (11) of the compressed air channel and / or the nozzle (9) by means of a coupling device (10), wherein the connection (11) is arranged in a spinning-out area (B S ) of the spinning device (3). [5] Attachment device (1) according to at least one of the preceding claims, characterized by that the suction gun (2) with the coupling device (10) is connected to different, each in a spinning area (B S ) of different spinning devices (3) arranged connections (11) of the respective compressed air channel and / or the respective nozzle (9). [6] Attachment device (1) according to at least one of the preceding claims, characterized bythat the coupling device (10) is arranged and / or formed at one end of a movable hose (12) of the suction gun (2). [7] Attachment device (1) according to at least one of the preceding claims, characterized by that the suction gun (2) is coupled to a mobile container (13) into which the threads (4) collected with the suction gun (2) can be removed. [8] Method for collecting and guiding synthetic threads (4) extruded from a spinning device (3), which can be carried out in particular with a feeding device (1) according to at least one of the preceding claims, wherein the following steps are preferably carried out in the order mentioned: • a suction gun (2) of the application device (1) is positioned between the spinning device (3) and an inlet (7.E) of a thread shaft (7) arranged between the spinning device (3) and a winding device (6); • the synthetic threads (4) extruded from the spinning device (3) are collected by means of the suction gun (2); • the threads (4) collected with the suction gun (2) are guided to a thread collecting device (5) of the application device (1) and transferred to the thread collecting device (5); • the threads (4) are guided through the thread shaft (7) and to the winding device (6) by means of the thread collecting device (5). [9] Method according to claim 8, characterized by that the threads (4) are guided individually from the suction gun (2) to the thread collecting device (5) and transferred to the thread collecting device (5). [10] Method according to claim 8 or 9, characterized by that the threads (4) break when being transferred to the thread collecting device (5), in particular due to the suction forces acting on the threads (4) by the thread collecting device (5) and the suction gun (2). [11] Method according to claims 8 to 10, characterized by that the threads (4) are cut by means of scissors or a knife when being transferred to the thread collecting device (5). [12] Method according to at least one of the preceding claims 8 to 11, characterized by that the threads (4) are guided from the suction gun (2) to the thread collecting device (5) by means of a yarn guide hook and / or by means of an operator's hand and are transferred to the thread collecting device (5).

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