CN115676513A

CN115676513A - Device for drawing and winding a thread

Info

Publication number: CN115676513A
Application number: CN202210882175.4A
Authority: CN
Inventors: M-A·赫尔恩多夫; A·哈米德
Original assignee: Oerlikon Textile GmbH and Co KG
Current assignee: Oerlikon Textile GmbH and Co KG
Priority date: 2021-07-27
Filing date: 2022-07-26
Publication date: 2023-02-03
Also published as: JP7425127B2; DE102022117598B3; JP2023018670A

Abstract

The invention relates to a device for drawing and winding a thread. The device comprises a godet roller housing for accommodating at least two godet rollers with driven godet roller covers, a frame for accommodating a plurality of winding stations distributed along a drivable winding spindle, and a thread laying device. The thread laying device has a movable thread guide at each winding station, which can be guided back and forth between a positioning position and an operating position in order to distribute the threads between the winding stations. In order to position and distribute the thread at the beginning of the process without operator work, a rotatably mounted thread tensioning roller is arranged between the thread guiding roller covers of the thread guiding roller in the thread trend and is provided with a measuring device for acquiring the total thread tension of the thread.

Description

Device for drawing and winding a thread

Technical Field

The invention relates to a device for drawing off and winding up threads in a melt spinning process.

Background

In the melt spinning process, the threads produced in the form of a thread sheet are drawn off, oriented and then wound in a parallel manner to form bobbins at the end of the process. For this purpose, a drawing-off and winding device is used, which, depending on the production process, has a plurality of godets and a plurality of winding stations arranged below the godets and jointly in a machine frame. Due to the low construction height and compactness of such a device, the operator can perform manual operations in a simple manner, in particular at the start of the process. However, modern systems are basically equipped with auxiliary devices to make them easier for the operator to handle. For example, in order to distribute the threads of the thread sheet between the winding stations and to be able to thread them, it is common initially to guide the threads with a movable suction jet so as to be received by the thread guide and distributed between the winding stations.

Such a generic device is known, for example, from DE102017004866 A1. In this connection, the winding stations are arranged in the machine frame so as to be distributed along the driven winding spindles. A godet roller frame is supported on the top side of the machine frame, and a plurality of godet rollers for drawing out the thread sheets are arranged on the godet roller frame. A thread laying device having a plurality of movable thread guides is arranged in the region between the godet roller and the winding station. The thread guides for distributing the threads between the winding stations can each be guided in a guide rail between a positioning position and an operating position. To this end, the thread guide is fastened to a rail which is moved by the operator.

In principle, however, wire placement devices are also known in such devices, in which case the operator can be relieved of further work, since the guidance of the wire guides in the guide rails between the positioning position and the operating position can be controlled by means of actuators. Such a generic device is for example from WO2016/180679. In this respect, the operator's work at the start of the process is limited to positioning the thread pieces by simply winding onto the godet covers of the godets before distribution between the winding stations.

However, as the use of auxiliary devices is increasing during the positioning of the wire, the skill of the operator to continuously receive the wire with the suction jet and to generate a wire tension in the wire sufficient for the respective operation is lost. Therefore, on the one hand, it is necessary to avoid thread breakage in the case of too high a thread tension and, on the other hand, thread curling in the case of too low a thread tension in the thread.

Disclosure of Invention

It is therefore an object of the present invention to develop a generic device for drawing out and winding up a thread, which enables an operator to be reliably freed from work by means of an auxiliary device.

Another object of the invention is to provide a generic device for drawing and winding a thread, whose thread laying device allows an automated operating capacity.

According to the invention, this object is achieved in that a rotatably mounted thread tensioning roller is arranged in the thread run between the godet roller covers of the godet rollers and has a measuring device for detecting the total thread tension of the thread.

The invention is based on the recognition that the thread tension generated by the suction jet acts on the entire thread sheet during the positioning of the thread sheet in the melt spinning process. In this respect, significant thread tensions in the individual threads are independent of the continuous receiving and discharging of the thread pieces by means of the suction jet. In this regard, the present invention utilizes a wire tensioning roller that is partially wrapped with wire to monitor the wire tension of the wire piece at an earlier point in the positioning process. This advantageously involves the use of a godet roller which is held in a fixed manner in order to achieve the desired winding of the thread sheet on the circumference of the thread-tensioning roller on the thread-tensioning roller between the godet roller covers of the godet roller in the course of the thread run. For this purpose, the thread tensioning roller has a measuring device for detecting the total thread tension of the thread.

Another important advantage of the invention is that the total (collecting) thread tension can be continuously monitored not only during the positioning of the thread sheet but also during the winding of the thread sheet. In particular, in the phase of a bobbin change in the winding station, anomalies in the thread tension can be detected. Thus, even individual thread breaks can be detected from the signal curve of the measuring device.

The measuring device can advantageously be formed by a drive motor of the thread tensioning roller, wherein at least one motor parameter for determining the drive torque is continuously detected.

As an alternative, however, it is also possible to use at least one strain gauge (DMS sensor) mounted on the shaft of the wire tensioning roller as a measuring device. The load exerted by the wire sheet on the wire tensioning roller can thus be obtained directly.

In order to allow continuous monitoring of the total thread tension of the thread piece, provision is also made for the measuring device to be connected to a monitoring unit, by means of which signal evaluation for determining the instantaneous thread tension can be carried out continuously. Thus, a first current/target comparison of the thread tension of the thread pieces can already be carried out in the monitoring unit to directly generate a corresponding control signal if a predetermined target value is exceeded or fallen below.

For this purpose, the monitoring unit is preferably connected directly to the machine control unit. The machine control unit can be used to perform corresponding corrections, for example compressed air setting conditions at the suction jet.

In order to position the thread in the region of the godet roller, a development of the device according to the invention has proven particularly successful in that the thread tensioning roller can be guided by means of a sliding guide on the godet roller frame along a movement path which intersects the common tangent of the godet roller housings of the godet rollers. The thread tension roller can thus be guided laterally next to the galette in a straight thread run, so that the thread tension roller automatically receives the thread piece during the guidance along the movement path.

For this purpose, the wire tensioning roller is kept out of contact with the wire in the positioning position and is kept in contact with the wire in the operating position. The positioning of the thread sheet on the circumference of the godet roller cover of the godet roller is thus ensured by the movement of the thread tension roller along the movement path. Once the wire is wound up by the wire tensioning roller and once the wire tensioning roller reaches the operating position, the wire tension of the wire sheet is acquired and monitored.

Depending on the thread fineness and on the number of threads guided by the thread tensioning rollers, the thread tensioning rollers are held in a freely rotatable manner or can be driven by a drive motor on the carriage. Therefore, the tension of the fine-fiber thread can also be reliably obtained by the thread tension roller. In this case, the wire tensioning roller can already be driven by the motor in the positioning position.

The carriage for moving the wire tensioning roller is preferably guided by a controllable linear drive. Thus, the actuation of the linear drive to initiate the positioning operation by means of the wire tensioning roller can be triggered manually by the operator or automatically by means of a timer.

The device for drawing off and winding a thread according to the invention is therefore particularly suitable for continuously monitoring the thread tension of a thread sheet at the start of and during a process.

Drawings

For further explanation of the invention, an embodiment of a device for drawing off and winding a thread according to the invention will now be explained in more detail with reference to the accompanying drawings, in which:

fig. 1 schematically shows a side view of an embodiment of the device for drawing and winding a thread according to the invention;

FIG. 2 schematically illustrates a front view of the embodiment of FIG. 1;

figure 3 schematically shows a cross-sectional view of the wire tensioning roller of the embodiment of figure 1;

fig. 4.1 and 4.2 schematically show a side view detail of the embodiment of fig. 1 in various operating situations in the wirelaying apparatus; and

fig. 5 schematically illustrates a rear view of the guide roller housing of the embodiment of fig. 4.1.

Detailed Description

In fig. 1 and 2, an embodiment of the device for drawing out and winding up a number of threads of the invention is schematically shown in several views. This example was used in a melt spinning process to draw freshly extruded filaments from a spinning device and then wind each filament of a filament sheet to form a package. In this regard, fig. 1 shows the embodiment in a side view, and fig. 2 shows the embodiment in a front view. If one of the figures is not explicitly mentioned, the following description applies to all figures.

In this embodiment, the apparatus for drawing off and winding a thread according to the invention comprises a total of five winding stations 1.1 to 1.5, which are arranged adjacent to one another in the machine frame 3. The winding stations 1.1-1.5 are arranged along the winding spindles 14, which are held in a projecting manner. In each winding station 1.1 to 1.5, the respective thread of the thread disk 2 is wound to form bobbins 26, wherein the bobbins 26 are held adjacent to one another on the winding spindle 14. The number of winding stations 1.1-1.5 and the number of threads of the thread sheet 2 are exemplary in this case. In principle, such a plant may comprise up to 16 winding stations.

The winding stations 1.1-1.5 have the same construction and each have a traversing unit 13. Each traversing unit 13 contains a guide mechanism (not shown in detail here) for guiding the thread assigned to the winding stations 1.1 to 1.5 back and forth within the thread laying stroke. The traverse unit 13 may be formed of, for example, a reversible threaded shaft traverse mechanism, a belt traverse mechanism, or a flywheel traverse mechanism.

For parallel winding of the threads of the thread sheet 2, each winding station 1.1-1.5 is assigned a winding bobbin 16 on the circumference of the driven winding spindle 14. For this purpose, the winding bobbin 16 is clamped on the circumference of the winding spindle 14. In this case, the winding spindles 14 extend through all winding stations 1.1 to 1.5, so that the threads are wound in parallel in the winding stations 1.1 to 1.5 to form bobbins 26.

In order to place the thread on the surface of the bobbin 26, a pressure roller 12 is provided, which extends parallel to the winding spindle 14 and is therefore assigned to the winding stations 1.1 to 1.5. The pressure roller 12 is arranged in the area between the traverse unit 13 and the winding spindle 14. The winding spindle 14 is mounted projecting on a winding turret 15, which is rotatably held in the machine frame 3. The winding turret 15 holds the second winding spindle 14, which is offset by 180 ° with respect to the first winding spindle 14. The rotation of the winding turret 15 allows the two winding spindles 14 to be alternately guided to the winding area and the change area, so that the thread 2 can be continuously wound in the winding stations 1.1 to 1.5 to form a bobbin 26. Both the winding spindle 14 and the winding turret 15 are connected to a drive (not shown here).

In one end region of the machine frame 3, the thread guiding roller frame 5 is arranged above the traversing unit 13. The godet roller frame 5 is supported on the machine frame 3. Two godet rollers 6 are arranged on the godet roller frame 5. In this case, each godet 6 has a godet cover 6.1 projecting in front of the godet frame 5 and a godet drive 6.2 arranged behind the godet frame 5. Above the godet roll 6, a yarn collector 25 is provided. The filament collecting device 25 is provided with a suction and discharge unit 25.1 and a filament collector 25.2.

Furthermore, an interlacing device 7 (interlacing device) with a respective processing channel for each thread 2 is held on the godet roller frame 5.

Rotatably mounted thread tensioning rollers 8 are arranged between the godet roller housings 6.1 of the godet rollers 6 in the course of the thread. The thread tension roller 8 projects parallel to the thread roller cage 6.1 on the thread roller frame 5 and is partially wound by the thread 2 of the thread sheet in the thread running direction. The wrap angle on the circumference of the wire tension roller 8 lies in the range of about 180 °. For further explanation of the wire tensioning roller 8, reference is also made to fig. 3.

Fig. 3 schematically shows the wire tensioning roller 8 in cross section. The wire tension roller 8 has a roller shell 30. The roll mantle 30 is fastened to the tip of the roll shaft 31. The roller shaft 31 is rotatably mounted in the carriage 10 via a bearing 33 through a bearing end in a manner projecting with respect to the roller cover 30. In this embodiment the carriage 10 is arranged to be movable in a sliding guide (not shown here). The thread tensioning roller 8 has a measuring device 32 for detecting the tensile load produced by the thread guided over the circumference of the roller shell 30. In this embodiment, the measuring device 32 is formed by at least one strain gauge (DMS sensor) 34 fixed on the roll shaft 31. For this reason, a plurality of strain gauges (DMS sensors) 34 are generally used in order to acquire a bending load on the roller shaft 31 by a mechanism called a bridge circuit. The strain gauge (DMS sensor) 34 is connected to a monitoring unit 35 through a signal line 36.

The thread tension roller 8 is thus mounted freely rotatably on the thread guide roller frame 5 and is driven by the thread 2 of the thread piece. In principle, however, it is also possible to drive the thread tension roller 8 by means of a drive motor. This alternative embodiment is illustrated by the dashed line in fig. 3. The bearing end of the roller shaft 31 is thus connected to the drive motor 37. In this case, the measuring device 32 may be formed by the drive motor 37 itself. The drive torque for driving the wire tensioning roller 8 can thus be detected using at least one motor parameter of the drive motor 37. For this purpose, the drive motor 37 is likewise connected to the monitoring unit 35 by means of signal lines. In the monitoring unit 35, the signal is used to enable continuous monitoring of the thread tension of the thread guided on the roll mantle 30.

In the operating situation shown in fig. 1 and 2, the thread 2 is wound continuously around the circumference of the winding spindle 14 to form a bobbin 26. The wire tensioning roller 8 is used to continuously monitor the wire tension applied to the wire sheet. For this purpose, the monitoring unit 35 is connected to a machine control unit 38. As shown in fig. 2, the machine control unit 38 is connected to the drive means (6.2, 11 and 25.4) and sensors (not shown here) and also to the operating panel 23. In particular during the operating phase in which the creeling takes place between the winding spindles 14, there is a risk of too high a thread tensile stress, which could potentially even lead to thread breakage. In this respect, it is particularly advantageous to monitor the thread tension by means of the thread-tensioning roller 8, in order to be able to perform a quick action. Thus, if a thread break is determined by thread tension monitoring in the monitoring unit 35, the machine control unit 38 can be provided with a control command that causes the thread-collecting device 25 to be activated. Thus, the thread pieces 2 are cut by the thread collecting device 25 and guided to the waste thread container.

However, too low a winding tension may occur during the winding of the yarn to form the bobbin. The wire tensioning roller 8 can also detect this and activate the corresponding machine control system.

As can be seen from the illustrations in fig. 1 and 2, in this exemplary embodiment the thread tensioning roller 8 is movably held on the thread guide roller frame 5 and cooperates with the thread laying device 4. The thread laying device 4 has a plurality of movable thread guides 17 above the winding stations 1.1 to 1.5 in order to distribute the threads at the start of the process in the winding stations 1.1 to 1.5.

For the explanation of the thread laying device 4, reference is also made to fig. 4.1 to 4.2. Fig. 4.1 and 4.2 show a detail of the side view of the embodiment of fig. 1 in different operating situations of the thread laying device 4. Reference is additionally made to fig. 5, which shows the rear side of the guide roller frame 5 in the operating situation shown in fig. 4.1.

The thread tension roller 8 projects parallel to the godet roller cover 6.1 of the godet roller 6 on the front side of the godet roller frame 5. The wire tension roller 8 is rotatably held on the carriage 10. The carriage 10 is guided in the slide rail 9. A sliding guide 9 extends between the godet rollers 6 so that the wire tensioning roller 8 can be guided along a movement path which intersects a tangent of the godet roller housing 6.1.

As can be taken from the illustration of fig. 5, the carriage 10 is connected to a linear drive 11. The linear drive 11 can be controlled by the machine control unit 38 such that the carriage 10 guides the wire tensioning roller 8 back and forth between a positioning position and an operating position. In this case, the linear drive 11 is shown by way of example in the form of a spindle drive, which is connected to the carriage 10 via a spindle 11.1. In this case, both the positioning position and the operating position of the wire tensioning roller 8 are provided in the end side region of the slide rail 9.

Furthermore, the godet drive 6.2 of the godet 6 and the suction connection 25.3 of the thread collection device 25 and the thread collection drive 25.4 are arranged on the rear side of the godet frame 5. The thread collector 25.2 can be activated by a thread collecting drive 25.4 in order to collect the thread pieces in case of a thread break and to supply them to the suction and discharge unit 25.1.

For separating and distributing the thread web 2, the thread laying device 4 has a respective thread guide in the form of a deflection roller 17 at each winding station 1.1-1.5. Each thread guide 17 is held on a guide rail 18 by means of a movable guide slide 19. The guide rail 18 is arranged in the upper region of the machine frame 3 and extends along the winding spindles 14 via a horizontal guide 18.1. The horizontal guide 18.1 is followed by a curved guide 18.2 of the guide rail 18, which extends beyond the spindle end of the winding spindles 14 toward the operating end. The curved guide 18.2 is followed by a vertical guide 18.3, which is oriented offset by approximately 90 ° with respect to the horizontal guide 18.1 of the guide rail 18. A first stop 21 is formed on the guide 18.3 of the guide rail 18. A second stop 21 is provided at the opposite free end of the horizontal guide 18.1 of the guide rail 18. The thread guide 17 can thus be guided back and forth between the operating position and the positioning position by a movement of the guide carriage 19 along the guide rail 18. For this purpose, one of the outer guide sliders 19 is coupled to an actuator (not shown here). The actuator used can be, for example, a cylinder without a piston rod for moving the first or last guide slide 19 of the thread guide 17 between its positioning position and its operating position. Likewise, the actuator can also be realized by a linear electric drive extending parallel to the guide rail 18 and moving the associated guide slider 19.

As can be gathered in particular from the illustration in fig. 4.2, the guide slider 19 is connected by an elastic band 20. The length of the elastic band 20 is dimensioned such that, in the pulled-out state, each guide slide 19 is in the operating position of the associated thread guide 17 in the winding stations 1.1 to 1.5. The thread guides 17, which are designed in the form of deflection rollers, each form the end of a traversing cam in their operating position, which is generated by the traversing unit 13 during the thread guidance during the winding. The deflecting roller 17 thus forms, in its operating position, a thread inlet to the respective winding station 1.1-1.5.

In order to be able to position the thread web 2 at the start of the process on the godet 6 and the winding stations 1.1 to 1.5, the threads 2 are guided jointly by the suction jet 24. The suction jet 24 can in this case be guided by an automated operating mechanism. In this case, the thread pieces drawn out from the spinning device are continuously supplied to the waste thread container by the suction ejector 24. The thread piece is then held on a freely rotatable guide roller 22 by means of a suction jet 24. The guide rollers 22 are arranged at the end of the machine frame 3, so that the thread web 2 forms a thread running plane which extends from the circumference of the thread guide roller cage 6.1 as far as the guide rollers 22. This situation is shown in fig. 4.1. In this case, in the positioning position, the thread-tensioning roller 8 is held laterally close to the thread movement plane but not in contact with the thread. Likewise, the thread guide 17 is held essentially in the vertical guide 18.3 of the guide rail 18 transversely close to the thread movement plane of the thread sheet 2. The thread laying device 4 is then ready for positioning the thread pieces on the thread guide roller cage 6.1 and for separating and distributing the thread pieces between the winding stations 1.1-1.5.

In the case of manual operation, the operator executes a control command through the operation panel 23 to activate the linear drive device 11 to move the wire-tensioning roller 8. The wire tensioning roller 8 moves in the sliding guide 9 and automatically collects the wire piece 2. The thread tensioning roller 8 produces a thread loop in the thread sheet up to the operating position. In the operating position of the thread tensioning roller 8, the thread web 2 is guided over the circumferential surface of the thread guiding roller cage 6.1. In addition, the thread 2 is automatically guided in the process into the processing channel of the interlacing device 7. This is shown in figure 4.2. The wire tensioning roller 8 is locked and held in the operating position.

To distribute the thread 2 between the winding stations 1.1-1.5, an actuator (not shown here) is activated to move the guide slide 19. This activation can be effected by an additional handle of the operator or, as an alternative, in a time-controlled manner after the linear drive for the wire tensioning roller 8 has been activated. In the plane of drawing, the thread guides or deflection rollers 17 can be guided from the position to the operating position in a staggered manner with respect to one another, so that the threads are separated and each deflection roller 17 receives a respective thread. The guide roller 22 has a guide groove forming a convergence point of the yarn on the circumferential surface. The thread 2 thus extends in a radial manner from the circumferential surface of the guide roller cage 6.1 to the guide roller 22. In this way, a predetermined distance of the threads relative to one another is set in the thread sheet in the region of the deflection roller 17. Once the thread guide 17 has reached its operating position in the winding stations 1.1-1.5, the thread sheet 2 is transferred by means of the suction jet 24 to an auxiliary device (not shown in greater detail here) in order to be able to grasp and start winding the thread 2 in the winding stations 1.1-1.5. In this case, the suction jet 24 may be guided by an automatic operation device. In this respect, the device for drawing and winding a thread according to the invention is particularly suitable for implementing a fully automatic process control.

During the positioning, the wire tension of the wire sheet can be continuously monitored by the wire tensioning roller 8. In this case, the thread tension can already be measured during the movement phase of the thread tensioning roller. But alternatively the thread tension is measured and monitored, preferably in the operating position of the thread tensioning roller 8. The thread tension generated by the suction jet 24 can thus advantageously be adjusted to a level required for a respective positioning operation. In particular, during the distribution of the thread 2 between the winding stations 1.1 to 1.5, a higher thread pull stress is required to produce a larger loop. The momentary thread tension in the thread piece of the thread 2 is captured by the measuring device 32 in the thread tensioning roller 8 and transmitted to the monitoring unit 35. The monitoring unit 35 may, for example, provide the thread tension profile of the positioning process as a target value, so that after the actual/target comparison a corresponding control command may be provided to the machine control unit 38. The machine control unit 38 may be used to set the pressure set point at the suction jet 24, for example, in an automated manner. It is therefore advantageously possible to use the aid means without intervention by the operator in order to position the thread sheet in the winding position at the start of the process.

Claims

1. An apparatus for drawing off and winding up threads in a melt spinning process, comprising a godet roller holder (5), a machine frame (3) and a thread laying device (4), the godet roller holder (5) being intended to accommodate at least two godets (6) having driven godet roller shells (6.1), the machine frame (3) being intended to accommodate a plurality of winding stations (1.1-1.5) distributed along a drivable winding spindle (14), the thread laying device (4) having a thread guide (17) at each winding station (1.1-1.5), the thread guide (17) being guidable between a positioning position and an operating position in each case for distributing the threads between the winding stations (1.1-1.5), characterized in that a rotatably mounted thread tensioning roller (8) is arranged in the thread run between the godet roller shells (6.1) of the godet roller (6) and has a measuring device (3) for acquiring the total thread tension of the threads (2).

2. Device according to claim 1, characterized in that the measuring device (32) is formed by a drive motor (37) of the thread tensioning roller (8), wherein at least one motor parameter for determining the drive torque is continuously acquired.

3. Device according to claim 1, characterized in that the measuring device (32) is constituted by at least one strain gauge (DMS sensor) (34), the strain gauge (DMS sensor) (34) being arranged on the shaft (31) of the wire tensioning roller (8).

4. Device according to any one of claims 1 to 3, characterized in that the measuring means (32) are connected to a monitoring unit (35) by means of which a signal evaluation for determining the instantaneous thread tension can be carried out continuously.

5. An apparatus according to claim 4, characterized in that the monitoring unit (35) is connected to a machine control unit (38).

6. Device according to any one of claims 1 to 5, characterized in that the wire tensioning roller (8) can be guided between a positioning position and an operating position in order to position the wire on the circumference of the guide roller cage (6.1).

7. The device according to claim 6, characterized in that the wire tensioning roller (8) can be guided along a movement path intersecting a tangent of the godet roller cover (6.1) of the godet roller (6) by means of a sliding guide (9) on the godet roller frame (5).

8. A device according to claim 6, characterised in that the wire tensioning roller (8) is kept out of contact with the wire (2) in the positioning position and in contact with the wire (2) in the operating position.

9. Device according to any one of claims 6 to 8, characterized in that the wire tensioning roller (8) is held on a carriage (10) in a freely rotatable manner or together with the drive motor.

10. Apparatus according to claim 9, characterized in that the carriage (10) can be guided in the slide guide (9) by means of a controllable linear drive (11).