WO2018108964A1

WO2018108964A1 - Method and apparatus for feeding a thread group

Info

Publication number: WO2018108964A1
Application number: PCT/EP2017/082517
Authority: WO
Inventors: Rainald Voss; Jürgen STRÖWER; Marc-André HERRNDORF; Tobias MÜNSTERMANN
Original assignee: Oerlikon Textile Gmbh & Co. Kg
Priority date: 2016-12-14
Filing date: 2017-12-13
Publication date: 2018-06-21
Also published as: JP7030810B2; CN110072791A; CN110072791B; JP2020502381A; DE112017006258A5

Abstract

The invention relates to a method and an apparatus for feeding a thread group in a melt-spinning process comprising at least one winding apparatus (2) having a plurality of godets (11.1-11.3) and a plurality of winding points (3.1-3.4) downstream of the godets (11.1-11.3). The thread group is sucked in by a suction flow in a tubular connection piece (14) of a suction device (1) and continuously discharged. The thread group is guided in a superimposed manner by a movement of the tubular connection piece (14), the suction flow in the tubular connection piece (14) being controlled by an operating pressure of compressed air fed to the suction devices (1). To obtain sufficient thread tension and secure thread guidance in every phase of the feeding process, the operating pressure of the compressed air is changed depending on one of a plurality of operating cycles in order to change the suction flow. To this end, a control valve (17) interacts with a control unit (23).

Description

Method and device for applying a yarn sheet

The invention relates to a method for applying a yarn sheet in a melt spinning process with at least one winding device according to the preamble of claim 1 and to an apparatus for applying a yarn sheet in a melt spinning process with at least one winding device according to the preamble of claim 6.

A generic method and a generic device for applying a group of threads in a melt spinning process with at least one take-up device is known for example from DE 10 2011 016 786 AI.

In the production or processing of threads in melt spinning plants, it is customary that at the beginning of a process a group of threads is first picked up by a suction device and continuously fed to a waste container. The suction device is preferably designed as a manually guided suction gun, so that a manual guidance of the yarn sheet is possible by a superimposed movement of the suction. Thus, the group of threads can be created according to a sequence of processes at godets and winding stations of a take-up device. For this purpose, an operator must take into account the thread guide provided in the process in order to obtain a trouble-free process startup. In particular, it is necessary that at any time of the application process, the yarn sheet is continuously withdrawn and sucked. In addition to the operation of the take-up device, control measures for maintaining a desired thread guide on the suction device are therefore also necessary.

It is an object of the invention to improve the generic method and the generic device for applying a group of yarns in a melt spinning process with at least one take-up device such that the yarn sheet is safely withdrawn by the suction device in each situation of the application process and guided to a waste container.

Another object of the invention is to make the generic method and the generic device for applying a group of threads repeatable and reproducible.

This object is achieved by a method with the features of claim 1 and by a device having the features of claim 6.

Advantageous developments are defined by the features and feature combinations of the respective subclaims. The invention is based on the recognition that during an application process, various operating cycles are passed through, which in particular require different suction powers of the suction device. For example, a bundle of threads, which is placed on a rotating godet when it is being applied, requires a higher suction power in relation to a group of threads which is deflected stationarily on thread guides. If the thread tension is too low, rotating godets will cause undesirable winder formation. In order to obtain the desired suction flow or suction force for each operating cycle, the operating pressure of the compressed air is changed as a function of the respective operating cycle. For this purpose, a control unit cooperates with the control valve of the suction device, so that each operating cycle when the yarn sheet is applied can be executed with a desired suction force on the yarn sheet.

Since the application of a group of threads in a take-up device with a plurality of godets takes place according to a predetermined sequence, the development of the method according to the invention is particularly advantageous, in which each drive cycles is assigned a predetermined operating pressure of the compressed air and that the operating pressures of the operating cycles are set by a control program. This sets in the suction at any time of the application process, a desired suction flow and suction for pulling and removing the yarn sheet.

In order to start the application process after each process interruption or after a process start, the method variant has proven particularly useful, in which the control program for changing the operating pressures of the compressed air is started by a control unit in response to an input signal. Thus, a compressed air profile can be automatically preset on the suction device in order to obtain the respective desired suction flow for guiding the yarn sheet. In order to comply with the same conditions as possible withdrawal conditions on the yarn sheet during an operating cycle, the development of the invention is preferably carried out in which a yarn tension on one of the threads of the yarn sheet during at least one of the operating cycles is measured and in which the operating pressure of the compressed air in response to a Thread tension reading is changed. For example, the yarn sheet can be guided with a substantially constant yarn tension.

This also gives the possibility to carry out the application process by auxiliary devices that generate a deflection of the yarn sheet. In that regard, the method variant is provided in which the suction nozzle is kept stationary during at least one of the operating cycles.

In that regard, the inventive method for mobile or stationary suction is particularly suitable. The device according to the invention for applying a group of yarns has the particular advantage that both manually controlled or automated application processes can thus be carried out safely. Due to the suction force adapted to the respective operating cycle for receiving and removing the thread saw, different thread guides can be realized during the application process.

Since the application of the yarn sheet at the beginning of the process or after a process interruption essentially takes place after a fixed run on the godets and the winding stations of the takeup device, the development of the device according to the invention is preferably carried out, in which the control unit has a processor for storing and executing a control program, by which one of several operating pressures of the compressed air is assigned to each of the operating cycles. Thus, the control valve can be controlled in accordance with the control program such that a desired suction force is present at the suction device for the respective operating cycle.

Regardless of whether the application process is performed by an operator or automatically, the control unit can preferably be controlled via a control key in order to trigger a start of the control program.

In the event that the control valve is associated with the suction device, the development of the invention is preferably carried out, in which the control valve is wirelessly connected to the control unit. In principle, however, it is also possible to assign the control valve stationary to the compressed air line. In this case, a wiring could be realized.

In order to obtain a desired thread tension as possible via the suction power and suction force of the suction device, the development of the device according to the invention is particularly advantageous, in which a measuring device for Measurement of a thread tension is provided on one of the threads of the yarn sheet, which is connected to the control unit. This makes it possible to realize a regulation of the suction force of the suction device in order to generate the most constant possible yarn tension on the yarn sheet. In this case, the possibility is also given that a measuring device is integrated in the suction device, which detects the thread tension of the yarn sheet.

A flexible application possibility is given in particular by the development of the device according to the invention, in which the suction device is designed as a mobile suction gun, which is performed manually by an operator or automatically by a robot.

In principle, however, it is also possible to carry out the suction device as a stationary suction unit, which is assigned to the take-up device. It is essential that during the various application processes on the godets and winding positions, the desired suction forces for pulling and receiving the yarn sheet are set.

The method according to the invention will be explained in more detail below with reference to an exemplary embodiment of the device according to the invention for applying a group of threads in a melt spinning process with reference to the attached drawings.

They show:

1 schematically an embodiment of the device according to the invention for applying a yarn sheet in a melt spinning process,

FIG. 2 schematically shows a view of an embodiment of a suction device for the device shown in FIG. 1, FIG. Fig. 3 shows schematically a time course of an operating pressure of the suction device according to Figure 2 when applying.

FIG. 1 schematically shows a first exemplary embodiment of the device according to the invention for applying a group of yarns in a melt-spinning process. In this case, only one winding device with several godets is shown, which is usually arranged below a spinning position of a spinning device for the extrusion of a yarn sheet. In such spinning devices, it is common that the freshly spun threads are peeled off by godets and wound after stretching in several winding positions parallel to coils. In that regard, a winding device 2 with a plurality of winding points 3.1 to 3.4 and a plurality of godets 11.1 to 11.3 arranged above the winding points 3.1 to 3.4 is schematically shown in FIG.

The godets 11.1 to 11.3 are held cantilevered on a godet carrier 12, wherein the godet carrier 12 is supported on a machine frame 13 of the take-up device 2. The godets 11.1 to 11.3 are coupled to drives, which are not shown here.

The winding device 2 has in this embodiment, a number of four winding points 3.1 to 3.4, in order to wind the yarn sheet 21 formed of four threads to form coils. The number of threads and the number of winding positions are exemplary. Thus, within a group of threads 10, 12 or 16 threads can be wound in parallel side by side to form coils. For this purpose, two winding spindles 4.1 and 4.2 are held cantilevered on a spool revolver 6. The winding spindles 4.1 and 4.2 are driven by separate spindle drives 5.1 and 5.1. The bobbin revolver 6 is coupled to a turret drive 6.1, so that the winding spindles 4.1 and 4.2 are alternately in an operating range and an alternating selbereich are feasible. In the operating range, the winding spindles 4.1 and 4.2 cooperate with a pressure roller 7.

For laying the threads, a traversing device 8 is provided, which has a traversing unit for each winding point 3.1 to 3.4.

The traversing device 8 is preceded by a separate deflection roller 9.1 to 9.4 for each winding point 3.1 to 3.4. The pulleys 9.1 to 9.4 are freely rotatably supported on a displaceable roller carrier 10. The pulleys 9.1 to 9.4 are used to separate the yarn sheet 21, which are performed in operation with simple wraps on the godets 11.1 to 11.3.

For applying and threading the threads of the yarn sheet 21, a mobile suction device 1 is provided by which an operator, not shown, the running threads for applying and threading to the godets 11.1 to 11.3 and the winding points 3.1 to 3.4 leads. For further explanation of the suction device 1, reference is made in addition to the illustration in FIG. 2 shows an embodiment of the suction device 1 is shown. The suction device 1 is designed here as a suction gun 15 and has a connection body 28, on which a pipe socket 14 is held. The pipe socket 14 forms at its free end a suction opening 18. Within the connecting piece 28 of the pipe socket 14 is connected to a waste line 19, so that adjusts a continuous suction channel. To generate a suction flow on the pipe socket 14, a compressed-air line 16 is connected to the connection body 28, the compressed-air line 16 opening into the suction channel via injector bores, not shown here. In this embodiment, a control valve 17 is integrated on the connecting body 28, which is associated with the compressed air line 16 in order to change an operating pressure of the supplied compressed air. As is apparent from the representation in Figure 1, the control valve 17 is wirelessly connected to a control unit 23. For this purpose, the control unit 23 has a transmitter 24 and the control valve 17 has a receiver 25.

The suction device 1 is connected via the waste line 19 with a waste container 20. The compressed air line 16 connects the suction device 1 with a compressed air source 22. In the situation shown in Figure 1, the suction device 1 is in an operating cycle to apply the yarn sheet 21 to the pulleys 9.1 to 9.4. For this purpose, the suction device 1 is designed as a mobile suction gun 15, which is operated in this embodiment by an operator. In this case, the suction device 1 is used in different operating cycles to create the yarn sheet before a process start a melt spinning plant. In order to be able to carry out such operating cycles during the application of the yarn sheet with the suction force required for drawing off and discharging the yarn sheet, a control program is started via the control unit 23. For this purpose, the control unit 23 has a processor in which the operating pressures of the suction device 1 assigned to the operating cycles are stored and executed in accordance with the control program. To start the control program for controlling the suction device 1, a control button 30 is provided on a control panel 29. The operator can start the application process via the control key 30. In this case, the operating pressures given by the control program per operating cycle of the suction device 1 are abandoned.

In the embodiment shown in Figure 1, an operating cycle is shown, in which the threads of the yarn sheet 21 are already applied to the godets 11.1 to 11.3 and in which the threads are separated on the individual pulleys 9.1 to 9.4. Separation is carried out by guiding the suction pad tole 15 in cooperation with a displacement of the roller carrier 10. In Fig. 1, this situation is shown in dashed lines.

After the separation has taken place, the roller carrier 10 is fixed in an operating position. Now, the suction gun 15 can be placed in a takeover position, in which auxiliary equipment, not shown here create the threads in the winding points 3.1 to 3.4. In this case, a change in the pressure setting on the suction device 1. In FIG. 3, an exemplary embodiment of various pressure settings during the application process is schematically illustrated.

FIG. 3 shows a diagram which represents an operating pressure of the compressed air on the ordinate and an operating time of the application of the yarn sheet on the abscissa. The application process is divided into a total of four operating cycles in this exemplary embodiment. In a first operating cycle, which is marked with I, a takeover of the yarn sheet by the suction device 1 takes place. For this purpose, the yarn sheet must be absorbed by the suction port of the pipe socket. The suction force at the suction opening of the pipe socket is especially high in the range of low operating pressures. Therefore, the operating pressure of the compressed air is set to the value pi. The operating cycle I is set via the control program over a time interval, which is indicated by ti to t ₂ in FIG.

According to the embodiment of Figure 1, a second cycle of operation could serve to create the yarn sheet on the circumference of the godets 11.1 to 11.3. In this phase, the highest possible operating pressure is set at the suction device in order to obtain a correspondingly high yarn tension in the yarn sheet 21 via the highest possible suction force. Thus, the threads can be performed with sufficient thread tension on the circumference of the godets 11.1 to 11.3, so that a winding formation is avoided. For this purpose, the operating pressure of Compressed air in the suction device 1 is set to the value p ₂ , as shown in Fig. 3.

In a next operating cycle, the yarn sheet is applied to the pulleys 9.1 to 9.4. In this operating time, a slightly lower operating pressure is required, which is characterized by p ₃ in the operating cycle III. The time intervals, which are identified by the code letters ti to t ₅ , are different in length depending on the respective application situation and are specified by the control program. The time intervals of one of the operating cycles can also vary if the operation is determined by manual activities. So there is slow and fast operator.

In a final operating cycle of the application process, the yarn sheet is applied in the winding points 3.1 to 3.4. In this operating time, a maximum adjustment of the operating pressure at the suction device 1 is required. In that regard, the operating pressure p _{4 is} set during the operating cycle IV.

The pressure profile shown in Figure 3 for controlling the compressed air to the suction device 1 is exemplary. What is essential here is that a thread tension that is desired for the respective application process prevails.

To improve the individual application phases, there is also the possibility that during one operating cycle a yarn tension is measured on one of the threads of the yarn sheet. For this purpose, a measuring device 27 is shown in dashed lines in Figure 1. The measuring device 27 is upstream of the godets 11.1 to 11.3 in the yarn path, wherein the yarn tension is monitored at least at one of the threads. The measuring device 27 is connected to the control unit 23. Thus, the predetermined via the control valve 17 pressure settings on the suction device 1 can be controlled according to a thread tension. The suction device 1 shown in Figures 1 and 2 is also exemplary. Thus, such suction guns 15 can also advantageously automated lead, for example by a robot arm. In this case, the control valve 17 is connected via a control line 31 to a control unit. In FIG. 2, the control line 31 is represented by broken lines for this purpose.

Basically, however, there is also the possibility that the control valve 17 is not associated with the suction device 1, but is formed stationary within the compressed air line 16. For this purpose, an embodiment of a control valve 17 is shown in dashed lines in Figure 1. The control valve 17 is arranged downstream of the compressed air source 26 in the illustrated embodiment, so that the compressed air line 16 is connected directly into the connection body 28 of the suction device 1. Furthermore, the suction device can also be formed by a stationary suction unit. Such stationary suction units can for example be assigned directly to the take-up device. Essential to the invention is that the operating pressure for generating a suction flow and for removing the yarn sheet depending on the respective operating cycle is changeable.

The method according to the invention and the device according to the invention can be used both during a process start of a melt spinning process and after a process interruption in the melt spinning process. Thus, a group of threads can be taken over by the suction device immediately after piecing. It is also possible to take over the yarn sheet after a process interruption of a stationary suction device.

Claims

claims

A method of applying a group of yarns in a melt spinning process with at least one winding device with several godets and a plurality of winding stations downstream of the godets, in which the group of threads is sucked through a suction flow in a pipe socket of a suction device and continuously discharged, wherein the yarn sheet by a movement of the Is guided superimposed pipe socket and / or a yarn guide and in which the suction flow is controlled in the pipe socket by an operating pressure of the suction device supplied compressed air,

characterized in that

the operating pressure of the compressed air is changed to change the suction flow in response to one of a plurality of operating cycles.

Method according to claim 1,

characterized in that

each of the operating cycles is assigned a predetermined operating pressure of the compressed air and that the operating pressures of the operating cycles are adjusted by a control program.

Method according to claim 2,

characterized in that

the control program for changing the operating pressures of the compressed air is started by a control unit in response to an input signal.

Method according to one of claims 1 to 3,

characterized in that

a yarn tension is measured on one of the threads of the yarn sheet during at least one of the operating cycles and that the operating pressure of the Compressed air is changed as a function of a thread tension measured value.

Method according to one of claims 1 to 4,

characterized in that

the suction nozzle is kept statio-när during at least one of the operating cycles.

Device for applying a yarn sheet in a melt spinning process with at least one winding device (2) with several godets (11.1

- 11.3) and a plurality of the godets (11.1 - 11.3) downstream winding points (3.1 - 3.4), with a suction device (1) having a pipe socket (14) with a suction opening (18) on a compressed air line (16) for generating a suction flow is connected and which is connected by a waste line (19) with a waste container (20), and with a control valve (17) through which an operating pressure of the compressed air is adjustable,

characterized in that

a control unit (23) cooperating with the control valve (17) is provided, by means of which the operating pressure of the compressed air for changing the suction flow is changed as a function of one of a plurality of operating cycles.

Device according to claim 6,

characterized in that

the control unit (23) comprises a processor for storing and executing a control program by which each of the operating cycles is assigned one of a plurality of operating pressures.

Device according to claim 7 or 8, characterized in that

the control unit (23) is connected to at least one control key (30), by which a start of the control program can be triggered.

Device according to one of claims 6 to 8,

characterized in that

the control valve (17) is wirelessly connected to the control unit (23) and that the control valve (17) is associated with the suction device (1) or the compressed air line (16).

Device according to one of claims 6 to 9,

characterized in that

a measuring device (27) for measuring a thread tension on one of the threads of the yarn sheet (21) is provided, which is connected to the control unit (23).

11. Device according to one of claims 6 to 9,

characterized in that

the suction device (1) is designed as a mobile suction gun (15), which is guided manually or automatically.

12. Device according to one of claims 6 to 9,

characterized in that

the suction device (1) is designed as a stationary suction unit which is assigned to the take-up device.