EP3168338B1 - Workstation of a two-for-one twister or cabling machine - Google Patents

Description

The present invention relates to a work station of a two-for-one twisting or cabling machine, which has a rotatably mounted spindle and a balloon thread guide eye that is height-adjustable by means of a drive.

Since a simple thread with regard to its strength and / or its evenness can often not meet the requirements that are placed on it during further processing or the end product, it is common in the textile industry to initiate a yarn refinement by using two or more threads twisted together. This textile process of yarn refinement is generally referred to as twisting, although a distinction is made between different types of twisting, for example between two-for-one twisting and cabling.

In two-for-one twisting, for example, two threads are often connected to one another with an S or a Z twist, with both threads each being given an additional twist. During cabling, on the other hand, a second thread is rotated around a feed thread, the rotation of the individual thread essentially remaining unchanged.

In the case of two-for-one twisting, there are also different types of presentation with regard to the way in which the threads are fed to the twisting machine. The feed threads can originate, for example, from a plied feed bobbin, which is stored in a protective pot of the twisting spindle, or a feed thread is unwound from two feed bobbins arranged one above the other in the protective pot of the twisting spindle.

In the present application, the term thread encompasses all linear structures, such as yarns, film tapes, tubular and tape-shaped textiles and the like. For the sake of simplicity, the term “thread” is used in the context of this application for all possible alternative embodiments.

In the textile machine industry, in connection with the finishing process, twisting, various embodiments of two-for-one twisting have been used for a long time. or cabling machines known and described in detail in numerous patents.

In all of these known two-for-one twisting or cabling machines, at least one running thread in the form of a thread balloon circles a twisting or cabling spindle in the area of each work station before it is wound into a take-up bobbin by means of a winding device.

Since, in particular with friction-sensitive yarn materials, such as polypropylene, polyester or polyacrylic, there is a risk that the thread will break if the thread balloon comes into contact with the stationary protective cup of the spindle during the twisting or cabling process, it was with such double-wire twisting or cabling machines initially customary to adjust the diameter of the thread balloon so that it is safely above the diameter of the stationary protective pot.

However, since large thread balloons are known to lead to relatively large ventilation losses and thus to increased energy requirements at the workplaces of the two-for-one twisting or cabling machines, various attempts have been made in the past to improve the diameter, especially in connection with less friction-sensitive yarn materials such as cotton to reduce or limit the thread balloons.

In the DE 44 04 555 C1 For example, two-for-one twisting spindles are described which, in addition to a stationary protective pot accommodating the supply bobbin, have a cylinder-like balloon limiter that encompasses the protective pot.

In such two-for-one twisting spindles, the formation of a thread balloon with a relatively large diameter is effectively prevented by the fact that the thread immediately runs against the inside of the balloon limiter after leaving the thread discharge plate of the spindle, which is relatively large in diameter.

For the two-for-one twisting spindle according to DE-OS 1 813 801 If the supply bobbin is not arranged in a protected manner in a stationary protective pot, but is open on a component of the two-for-one twisting spindle designed as a bobbin carrier.

In order to avoid contact between the circumferential thread balloon supported on the outside on a cylindrical balloon limiter and the supply bobbin, a cylindrical thread guide arranged between the balloon limiter and the supply bobbin is provided in these known twin-wire spindles, which surrounds the supply bobbin at the top edge of the balloon limiter.

Through the DE 101 51 167 A1 a cabling and / or two-for-one twisting spindle is disclosed which, in addition to a balloon thread guide eyelet 11, has at least one, but preferably three, balloon limiting rings 32, 33, 34. While the balloon thread guide eye 11 according to the DE 101 51 167 A1 is arranged stationary above the spindle, the three balloon limiting rings 32, 33, 34, which have different diameters, are vertically adjustable.

A disadvantage of these known two-for-one twisting spindles, however, is the relatively long physical contact between the rotating thread balloon and the stationary balloon limiter.

Since the stresses acting on the thread through such stationary balloon limiters are relatively high, such two-for-one twisting spindles can only be used for relatively insensitive threads.

It has therefore already been proposed to influence the size of the thread balloon by intervening in a controlling or regulating manner in the thread tension of the thread forming the thread balloon at the workplaces of two-for-one twisting or cabling machines.

Such, for example in the DE 10 2008 033 849 A1 The two-for-one twisting or cabling machines described usually have a large number of juxtaposed, usually identically designed work stations, the work stations each having a stationary protective pot to accommodate at least one supply bobbin, a twisting or cabling spindle and a device for influencing the thread tension.

In the case of a work station that works according to the two-for-one twisting process, a single or multiple plied thread is drawn off upwards from a supply bobbin arranged in the protective pot and over a thread on the bobbin axis Controllable yarn feed mechanism arranged on a twisting spindle is introduced into the upper end of the hollow bobbin axis of the twisting spindle.

That is, the plied thread is deflected downwards at the thread feed mechanism and arrives at a rotatably mounted, drivable thread twist distribution element which is arranged below the protective pot and which is designed, for example, as a so-called twist plate. The running, plied thread leaves the twisting plate, which can be designed, for example, as an ejection plate with storage disk, via a radial opening arranged in the twisting plate and is then guided to a stationary balloon thread guide arranged above the protective pot. Due to the rotation of the twisting plate between the twisting plate and the balloon thread guide eyelet arranged above the protective pot, the pinned thread forms a thread balloon rotating around the protective pot, the size of the thread balloon being set during the twisting process being adjustable by the thread feed mechanism.

At a work station that works according to the cabling process, two separately arranged supply spools are used. As usual, a first supply reel is positioned in a protective pot at the work station, while a second supply reel is arranged in an associated creel.

From this supply bobbin stored in the creel, a so-called outer thread is drawn off by a defined controllable thread feed mechanism and introduced from below into the hollow bobbin axis of a rotatably mounted, drivable thread twist distribution element, which is designed, for example, as a twist plate.

The running outer thread leaves the storage disk via a radial opening and is then guided, for example via the twisting plate, to a stationary balloon thread guide arranged above the protective pot.

Due to the rotation of the twisting plate between the twisting plate and the balloon thread guide eyelet arranged above the protective pot, the outer thread also forms a thread balloon rotating around the protective pot, the size of which can be adjusted by the thread feeder during the cabling process.

After passing the balloon thread guide eyelet, both the twisted and the cabled thread are wound up by a winding device to form a take-up bobbin.

In the workstations of the two-for-one twisting or cabling machines described above, in which the height of the circulating thread balloon is limited by a balloon thread guide or a balloon thread guide eyelet, it is often not possible or, as a rule, at least extremely difficult to make changes with regard to the operation of the workstation the height of the thread balloon.

However, textile devices are also known in the textile machine industry in which the height of the thread balloon can be adjusted.

In the DE 37 39 175 A1 For example, a creel is described in which the unwinding behavior of the supply bobbins is optimized in that the distance between the supply bobbin in question and an associated balloon thread guide changes continuously during operation, depending on the weight of the supply bobbin.

That is, in this known creel, either the supply bobbins or the balloon thread guides are movably mounted.

Also in the DE 10 103 892 A1 the height adjustment of a balloon thread guide eyelet is mentioned. However, this reference describes a method and a device with which the thread withdrawal speed of supply bobbins arranged in the creel of a warping machine is to be optimized.

Textile machines with movably mounted balloon thread guides or balloon thread guide eyes are also known in connection with ring spinning machines.

In the DE 44 02 582 A1 For example, a ring spinning machine is described, the balloon thread guides of which are mounted so that they can be adjusted in height, as is customary in such textile machines. That is, the ring spinning machine has several machine banks arranged one above the other on both of its longitudinal machine sides, with further, vertically movably mounted machine banks being installed above a stationary spindle bank, as is known. At the top of these vertically movable machine banks the balloon thread guides of the numerous workplaces of the ring spinning machine are arranged. With such an arrangement, all balloon thread guides on one side of the machine are always displaced together during the spinning operation; a separate control of the balloon thread guide of an individual work station is not possible.

With the ring spinning machine according to EP 1 071 837 B1 a comparable arrangement is given, but here the balloon thread guides are also arranged in a tiltable manner on their vertically displaceable machine bench. Such a tiltable arrangement of the balloon thread guides improves access to the ring spinning spindles and thus considerably facilitates the automation of the bobbin changing process of the ring spinning machine.

Furthermore, in the EP 2 260 132 B1 a twisting or cabling machine described, the work stations are each equipped with a vertically adjustable thread balloon guide. In this known textile machine, the production speed of the work stations is to be increased by appropriate positioning of the thread balloon guide, while the yarn quality is to be maintained. With regard to the manner in which the thread balloon guide is positioned, this reference does not contain any information.

Based on the above-mentioned prior art, the invention is based on the object of creating a workstation of a two-for-one twisting or cabling machine which is designed so that the balloon thread guide eyelet of a workstation, which is height-adjustable by a drive, can always be positioned in an optimal operating position.

According to the invention, this object is achieved in that the drive is coupled to a control device that controls the drive so that it shifts the balloon thread guide eyelet between working positions that are dependent on production parameters and a rest position during production interruptions and related transient working phases and that a device for recording a measured variable is available that is available to the control device and which causes the regulation of the drive to change the position of the balloon thread guide eyelet.

Advantageous embodiments of the device according to the invention are the subject of the subclaims.

The device according to the invention has the particular advantage that it is ensured at all times during operation of the work station that the balloon thread guide eyelet is advantageously positioned. That is, a control device immediately ensures that the drive positions the balloon thread guide eyelet in an optimal operating position as a function of a measured variable that is provided by an assigned device. In the event of production interruptions, the balloon thread guide eyelet is positioned, for example, in a rest position in which the spindle of the work station is easily accessible to the operating personnel.

In a first advantageous embodiment it is also provided that the device for detecting a measured variable is a measuring device which monitors the energy consumption of the spindle drive during operation of the work station.

This means that the current that is picked up by the spindle drive is determined by means of a measuring device and a measured variable is generated therefrom, which enables information about the current operating status of the work site, especially the size of the thread balloon and thus the position of the balloon thread guide eyelet.

That is, by measuring the power or the torque of the drive device of the spindle, the measuring device creates a measured variable which can be used by the control device in order to advantageously position the balloon thread guide eyelet by means of an associated drive.

The measuring device for detecting a measured variable that can be processed by the control device can, however, also have other embodiments.

For example, a time measuring device can also be used which, for example, sets a measured variable after a certain period of time that the workplace needs to run up to operating speed again after a standstill, which the control device processes in such a way that the drive is caused to move the balloon thread guide eyelet from a rest position to a working position.

In a further advantageous embodiment, the device for detecting a measured variable can also be designed as a sensor device which detects the size of a thread balloon encircling the spindle during operation of the work station. The sensor device is designed, for example, as a light barrier which has a light source and a light receiver and which scans the rotating thread balloon with a light beam.

With such a sensor device, the thread forming the thread balloon generates a signal with each revolution by shading the light beam, which is processed by the sensor device to a measured variable and passed on to the control device.

A thread tension sensor can also be used as a device for detecting a measured variable, which is arranged in the area of the thread path of a twisted or cabled thread, preferably between the rest position of the balloon thread guide eyelet and a thread feed mechanism upstream of the winding device.

Such a thread tension sensor connected to the control device is also able to generate a measured variable from the measured thread tension, on the basis of which the control device then causes the balloon thread guide eyelet to be optimally positioned at the work site.

In an advantageous embodiment, each of the work stations of the two-for-one twisting or cabling machine is also equipped with an adjustable thread tension influencing device, which is designed, for example, as a thread feed mechanism or as a thread brake.

The thread tension of a rotating thread balloon can be adjusted very finely with both a thread feed mechanism and a thread brake, that is, one Such controllable thread tension influencing device, in conjunction with an advantageous working position of the balloon thread guide eyelet, enables the size and shape of the circulating thread balloon to be optimized at any time, and thus a significant reduction in the energy requirement of the job in question.

In an advantageous embodiment, the control device is also designed in such a way that, during operation of the work station, together with the thread tension control device, it ensures that the balloon thread guide eye is moved from a first working position to a second working position in order to reduce the energy consumption of the spindle drive, with the balloon thread guide eye in the second working position is preferably arranged between the first working position and the rest position of the balloon thread guide eyelet.

The control device is preferably designed in such a way that signals related to a specific event at the relevant work station, e.g. spindle start, thread breakage, end of run time or lot change, immediately lead to a defined control of the drive of the balloon thread guide eyelet and thus to an advantageous positioning in a rest position or a working position can be used. The design of the control device ensures that the balloon thread guide eyelet is advantageously positioned at all times during operation of the work station. That is, the control device immediately ensures that a drive positions the balloon thread guide eyelet optimally according to the event, depending on a measured variable which is provided by an assigned device and which is related to a specific event at the relevant work site.

Further details of the invention can be found in the exemplary embodiments illustrated below with reference to the drawings.

Fig. 1

schematisch, in Seitenansicht eine Arbeitsstelle einer Kabliermaschine, mit einer erfindungsgemäßen, mittels eines Antriebes höhenverstellbaren, in einer Ruhestellung positionierten Ballonfadenführeröse, wobei an den Antrieb der Ballonfadenführeröse eine Regeleinrichtung angeschlossen ist, die mit einer Zeitmesseinrichtung in Verbindung steht; die Arbeitsstelle befindet sich im Stillstand,

Fig. 2

die Arbeitsstelle gemäß Fig.1 während des Betriebes, wobei die Ballonfadenführeröse aus einer Ruhestellung in eine Arbeitsposition abgesenkt wurde,

Fig. 3

eine zweite Ausführungsform einer Arbeitsstelle einer Kabliermaschine mit einer an den Antrieb der Ballonfadenführeröse angeschlossenen Regeleinrichtung sowie einer Einrichtung, die während des Betriebes der Arbeitsstelle die Energieaufnahme des Spindelantriebs überwacht,

Fig. 4

eine weitere Ausführungsform einer Arbeitsstelle einer Kabliermaschine mit einer an den Antrieb der Ballonfadenführeröse angeschlossenen Regeleinrichtung sowie einer als Lichtschranke ausgebildeten Sensoreinrichtung, die während des Betriebes der Arbeitsstelle den Durchmesser eines umlaufenden Fadenballons überwacht,

Fig. 5

eine dritte Ausführungsform einer Arbeitsstelle einer Kabliermaschine mit einer an den Antrieb der Ballonfadenführeröse angeschlossenen Regeleinrichtung sowie einem Fadenzugkraftsensor zur Überwachung der Fadenspannung zum Beispiel eines Cordfadens,

Fig. 6

eine Arbeitsstelle einer Kabliermaschine mit einer an den Antrieb der Ballonfadenführeröse angeschlossenen Regeleinrichtung, Einrichtungen zur Erstellung von Messgrößen, die die Regeleinrichtung verarbeitet, um die Ballonfadenführeröse zu positionieren sowie einem mit der Regeleinrichtung verbundenen Fadenlieferwerk für den Außenfaden,

Fig. 7

eine Arbeitsstelle mit einer Regeleinrichtung, die eine definierte Verlagerung der Ballonfadenführeröse aus einer ersten in eine zweite Arbeitsposition ermöglicht,

Fig. 8

schematisch, in Seitenansicht eine Arbeitsstelle einer Doppeldrahtzwirnmaschine mit einer mittels eines Antriebes höhenverstellbaren Ballonfadenführeröse, wobei der Antrieb mit einer Regeleinrichtung verbunden ist, an die außerdem ein Fadenzugkraftsensor sowie ein Fadenlieferwerk angeschlossen sind.

It shows:

Fig. 1

schematically, in side view, a work station of a cabling machine, with an inventive, height-adjustable by means of a drive, balloon thread guide eyelet positioned in a rest position, a control device being connected to the drive of the balloon thread guide eyelet, which is connected to a time measuring device; the job is at a standstill,

Fig. 2

the job according to Fig. 1 during operation, whereby the balloon thread guide eyelet was lowered from a rest position to a working position,

Fig. 3

a second embodiment of a work station of a cabling machine with a control device connected to the drive of the balloon thread guide eyelet and a device that monitors the energy consumption of the spindle drive while the work station is in operation,

Fig. 4

a further embodiment of a work station of a cabling machine with a control device connected to the drive of the balloon thread guide eyelet and a sensor device designed as a light barrier that monitors the diameter of a rotating thread balloon while the work station is in operation,

Fig. 5

a third embodiment of a work station of a cabling machine with a control device connected to the drive of the balloon thread guide eyelet and a thread tension sensor for monitoring the thread tension, for example a cord,

Fig. 6

a work station of a cabling machine with a control device connected to the drive of the balloon thread guide eyelet, devices for the creation of measured variables which the control device processes in order to position the balloon thread guide eyelet and a thread feed mechanism connected to the control device for the outer thread,

Fig. 7

a work station with a control device that enables a defined displacement of the balloon thread guide eyelet from a first to a second working position,

Fig. 8

schematically, in a side view, a work station of a two-for-one twisting machine with a balloon thread guide eyelet which can be adjusted in height by means of a drive, the drive being connected to a control device to which a thread tension sensor and a thread feed mechanism are also connected.

In the Fig. 1 is shown schematically in side view a work station 1 of a cabling machine with a balloon thread guide eyelet 9, which is adjustable in height by a drive 18. The drive 18 is connected to a control device 20. The work station 1 is at a standstill, that is, the spindle drive 3 is switched off; the spindle 2 does not rotate.

As in Fig. 1 indicated, a (not shown in detail) creel 4 is positioned above or behind the work station 1, which usually serves to receive a plurality of supply bobbins 7.

A so-called outer thread 5 is drawn off from at least one of these supply bobbins 7, hereinafter referred to as the first supply bobbin 7.

As can be seen, the outer thread 5 withdrawn from the first supply bobbin 7 is deflected several times before it enters the hollow axis of rotation of the spindle drive 3 in the area of an axis of rotation 35 of the spindle 2.

The outer thread 5 leaves the hollow axis of rotation of the spindle drive 3 through a so-called thread outlet bore, which is arranged slightly below a protective pot 19 and points radially outwards, and arrives at the outer region of a thread deflection device 8.

The outer thread 5 is deflected upwards in the area of the thread deflecting device 8 and arrives at a balloon thread guide eyelet 9, where it meets an inner thread 16.

When the spindle is at a standstill, the outer thread 5 is there, as in FIG Fig. 1 shown, on the outer wall of the protective pot 19.

As already indicated above, the work station 1 has a rotatably mounted spindle 2 and a thread deflection device 8 which rotates about an axis of rotation 35.

A protective pot 19 is arranged on the thread deflecting device 8 and has a hood 6 with a thread brake 10. A second supply bobbin 15 is stored in the protective pot 19, from which the so-called inner thread 16 is withdrawn overhead, which arrives via the thread brake 10 to the balloon thread guide eyelet 9 arranged above the spindle 2, where it makes contact with the outer thread 5.
The protective pot 19, which receives the second supply bobbin 15 and which is mounted on the rotatable thread deflection device 8, is secured against rotation, preferably by a magnetic device (not shown). The rotatably mounted thread deflection device 8 of the spindle 2 is acted upon by a drive. This means that either, as in the present exemplary embodiment, a direct drive in the form of a spindle drive 3 is provided, or, for example, in FIG Fig. 8 shown, an indirect drive device.

The threads (outer thread 5 and inner thread 16) that meet in the balloon thread guide eyelet 9 pass via a thread conveying device 11 to a winding and winding device 12, where they are wound up to form a take-up bobbin 14.
This means that the threads 5 and 16 cabled to form a cord 13, for example, during an ongoing work process in the area of the balloon thread guide eyelet 9, are wound on the winding and winding device 12 to form a take-up bobbin 14, which is designed, for example, as a cheese. Cords are twisted, cabled or twisted yarns.

For this purpose, the winding and winding device 12 has, inter alia, a drive roller 17 which drives the take-up bobbin 14 in a frictionally engaged manner during the working process.

Like in the Fig. 1 shown schematically, the balloon thread guide eyelet 9 is mounted so as to be vertically displaceable and is connected to a drive 18 which in turn is connected to a control device 20 which is connected to a timing device 23 is. The control device 20 ensures that when the work station 1 is stationary, the drive 18 positions the balloon thread guide eyelet 9 in a rest position RS in which the balloon thread guide eyelet 9 is slightly raised. That is, the balloon thread guide eyelet 9 is positioned so that there is a relatively large distance between the balloon thread guide eyelet 9 and the hood 6 of the protective pot 19, which has a positive effect on the accessibility of the spindle 2 or the protective pot 19.

The Fig. 2 shows the work station 1 described above during operation, that is, while a cord 13 is being cabled at the work station, for example.
As already mentioned above in connection with the Fig. 1 explained, an outer thread 5 is withdrawn from a first supply bobbin 7 arranged in a creel 4, which, deflected several times, runs into the hollow rotation axis of the spindle drive 3 in the area of the axis of rotation 35 of the spindle 2.

The outer thread 5 leaves the hollow axis of rotation of the spindle drive 3, as is known, through a so-called thread outlet bore which is arranged slightly below a protective pot 19 and points radially outward and is part of a rotating thread deflection device 8.
When leaving the thread deflecting device 8, the running outer thread 5 is deflected upwards and, forming a thread balloon B, the shape and size of which is determined, among other things, by the position of the balloon thread guide eyelet 9 and which encircles the protective pot 19, to the balloon thread guide eyelet 9, where it opens the inner thread 16 hits, which is simultaneously drawn overhead from a second supply bobbin 15, which is stored in a protective pot 19 of the spindle 2. In the area of the balloon thread guide eyelet 9, the outer thread 5 and the inner thread 16 are cabled to form a cord 13, which is transported by the thread conveyor 11 to the winding and winding device 12 and wound up there to form a take-up bobbin 14.

At the start of the work process, the balloon thread guide eyelet 9, which is vertically adjustable by means of a drive 18, is initially positioned in a rest position RS. The thread balloon B1 then has a relatively large height and a relatively large diameter D1 on. Such a design is quite unfavorable in terms of air friction and leads to a relatively high energy requirement for the spindle drive 3.
A control device 20 connected to the drive 18 of the balloon thread guide eyelet 9, which is connected to a time measuring device 23, therefore ensures that the balloon thread guide eyelet 9 is in a working position as soon as the spindle 2 has reached its operating speed or before the spindle 2 reaches its operating speed AP is lowered, in which the thread balloon B2 has a significantly lower height and also a significantly smaller diameter D2. In this way it is possible to significantly reduce the energy requirement of the spindle drive 3 of the work station 1.
The time which the spindle 2 needs to reach its operating speed is monitored by means of the time measuring device 23. That is, the time measuring device 23 provides the control circuit 20 with a measured variable i which the latter uses to control the drive 18. However, the time measuring device 23 can also work with a fixed value, after which it provides the control circuit 20 with a measured variable i.

In the Fig. 3 The illustrated embodiment of a work station 1 of a cabling machine differs only slightly in its structural design from the one above with reference to FIG Figures 1 and 2 described embodiment.
The following description of the Fig. 3 is therefore essentially limited to a brief explanation of the differences.

In the embodiment according to Fig. 3 the drive 18 for positioning the balloon thread guide eyelet 9 is coupled to a control device 20, which in turn is connected to a device for detecting a measured variable, which in the embodiment shown is a measuring device 21 that monitors the energy consumption of the spindle drive 3 during operation of the workstation 1 .
This means that when the spindle 2 reaches its operating speed and the energy consumption of the spindle drive 3 has reached a certain level, the measuring device 21 provides the control device 20 with a measured variable i which the control device 20 uses to control the drive 18.
The drive 18 is regulated, for example, in such a way that it displaces the balloon thread guide eyelet 9 from its rest position RS into its working position AP, in which the thread balloon B2 has a significantly smaller height and also a significantly smaller diameter D2. In this way it is possible to significantly reduce the energy requirement of the spindle drive 3 of the work station 1.

The ones in the Figures 4 and 5 The illustrated embodiments of a work station 1 of a cabling machine differ from the work station according to FIG Fig. 3 only with regard to the design of their facilities for recording a measured variable i.

In the embodiment according to Fig. 4 the device for detecting a measured variable i is a sensor device 25 which is designed as a light barrier, that is to say has a light source 26 and a light receiver 27.

Such optically working light barriers are shaded by the running thread of a rotating thread balloon B, in the exemplary embodiment the outer thread 5 coming from the first supply bobbin 7, intermittently from a light beam 28 with each revolution of the thread balloon B, which provides information about the current speed of the spindle 2 and the diameter of the thread balloon B allows.
With such a sensor device 25, connected to the control device 20 and formed as a light barrier, not only can the diameter of the thread balloon B be determined, but also the speed of the spindle 2 can be monitored relatively easily and a measured variable i can be transmitted to the control device 20 when the operating speed is reached become. The control device 20 then ensures that the drive 18 optimizes the balloon thread guide eyelet 9 with respect to its position, that is, the drive 18 transfers the balloon thread guide eyelet 9 from its rest position RS to the working position AP.

In the embodiment according to Fig. 5 the device for detecting a measured variable i is a thread tension sensor 24, which is arranged in the thread path of a cord 13 shortly before the winding and winding device 12.
With such a thread tension sensor 24, the thread tension of the cord 13 is monitored and a measured variable i is generated when the thread tension reaches a predetermined limit value.

When such a measured variable i is obtained, the control device 20 then ensures, as usual, that the drive 18 moves the balloon thread guide eyelet 9 into the working position AP, which leads to a smaller thread balloon and thus to a reduction in the thread tension.

In the Fig. 6 a work station 1 of a cabling machine is shown, which has a control device 20 connected to the drive 18 for the balloon thread guide eyelet 9, various devices for detecting a measured variable i and a thread tension influencing device 22 connected to the thread path of the outer thread 5.

Preferably, one of the devices connected to the control device 20 for detecting a measured variable i is a measuring device 21, which, as above, is based on the Fig. 3 stated, the energy consumption of the spindle drive 3 is monitored during the operation of the workstation 1.
In the embodiment of Fig. 6 A thread tension sensor 24 is also used as a further device for detecting a measured variable i, which scans the cord 13 and is installed, for example, just below a thread conveyor 11.
The thread tension influencing device 22 switched into the thread path of the outer thread 5 is, for example, an adjustable thread feed mechanism or an adjustable thread brake.

With a design of a work station 1, as described above, it is ensured that the control device 20, depending on the measured variables i of the devices 21 and / or 24, always ensures that the drive 18 positions the balloon thread guide eyelet 9 advantageously at all times, and also ensures that the thread tension influencing device 22 keeps the thread tension of the thread balloon B2 at an optimal value.

The Fig. 7 shows a workstation 1 of a cabling machine on a slightly larger scale.

As can be seen, at this work station 1 the balloon thread guide eyelet 9 can be shifted between a rest position RS, which is advantageous in the event of production interruptions, and work positions AP ₁ , AP ₂ dependent on spinning parameters and related transient work phases.

That is, the control device 20 is designed so that, depending on a measured variable i provided, for example, by a measuring device 21, the drive 18 for the balloon thread guide eyelet 9 is controlled so that the balloon thread guide eyelet 9 first moves from its rest position RS into an advantageous working position AP _{1 is} relocated. The balloon thread guide eyelet is later transferred to an optimal working position AP ₂ , the thread tension of the outer thread 5 being increased somewhat at almost the same time by means of the thread tension influencing device 22, for example a thread feeder, thereby creating a thread balloon B3 with an optimal diameter D3.
In the course of the adjustment work to optimize the thread balloon B, the working positions of the balloon thread guide eyelet 9 naturally also result in a large number of working positions that lie _{between the working position AP 1} and the working position AP _2.

The Fig. 8 shows a schematic side view of a workstation 1 of a two-for-one twisting machine. The work station 1 has, among other things, a spindle 2 designed as a twisting spindle with a protective pot 19 for receiving at least one supply bobbin 15, a rotatably mounted thread deflection device 8 and a vertically adjustable balloon thread guide loop 9.
The balloon thread guide eyelet 9 can be positioned either in a rest position RS or in one of the working positions AP ₁ and AP ₂ or intermediate positions by a drive device 29 which is connected to a control device 20.

As can be seen, a thread tension sensor 24, a thread feed mechanism 31 and a drive device 30 for the spindle 2 or its thread deflection device 8 are also connected to the control device 20.

A thread 28 withdrawn from a supply bobbin 15 is introduced from above into a hollow axis of rotation of the thread deflecting device 8 arranged in the area of an axis of rotation 35 of the spindle 2 and passes through the thread feed mechanism 31.
The thread 28 leaves the hollow axis of rotation through a so-called thread outlet bore, which is arranged somewhat below a protective pot 19 and points radially outwards, and arrives at the outer region of the thread deflection device 8.
As usual, the thread 28 is deflected upwards at the thread deflection device 8 and, forming a thread balloon B1, arrives at the balloon thread guide eye 9, which at this point in time, i.e. when the spindle has reached operating speed 2 or before, is in a rest position RS is positioned.

The thread 28, which is designed as a double wire, arrives via a thread conveying device 11 to a winding and winding device 12, where the twisted thread is wound up to form a take-up bobbin 14.

In the present exemplary embodiment, the spindle 2 has an indirect drive device 30. That is to say, the thread deflecting device 8 has a whorl 32, which is acted upon by a drive belt 33, which also runs via a drive wharve 34 of a drive shaft 36, for example in a machine position. The drive shaft 36 is connected to a drive 38 via a belt drive 37, for example.
As soon as a measuring device 21 connected to the drive 38, which monitors the energy consumption of the drive 38, for example, registers, for example, that the spindle 2 is running at operating speed, a measured variable i is sent to the control device 20, which then ensures that the drive device 29, the balloon thread guide eyelet 9 is transferred from the rest position RS to a working position AP ₁ .

In order to further increase the profitability of _{the two-for-one twisting machine, following the displacement of the balloon thread guide eyelet 9 into the working position AP 1,} the thread tension of the plied thread 28, which circulates as a thread balloon B2, can be increased by means of the thread feeder 31 and at the same time the balloon thread guide eyelet 9 can be moved into an optimal working position AP ₂ be transferred, creating a thread balloon B3 with an optimal diameter D3.

In the course of transferring the balloon thread guide loop 9 from the working position AP ₁ to the working position AP ₂ , there are of course a large number of further working positions that lie _{between the working position AP 1} and the working position AP _2.

Claims (11)

1. Workstation (1) of a two-for-one twisting or cabling machine, which workstation (1) comprises a rotatably mounted spindle (2) and a balloon thread guide eye (9), the height of which can be adjusted by means of a drive (18, 29),
   characterised in that
   the drive (18, 29) is coupled to a control device (20), which controls the drive (18, 29) in such a way that the drive (18, 29) moves the balloon thread guide eye (9) between working positions (AP₁, AP₂), which are dependent on production parameters, and a rest position (RS) in the event of production interruptions and related transient working phases, and
   in that a device (21, 23, 24, 25) for capturing a measurement variable (i) is provided, which measurement variable (i) is provided to the control device (20) and brings about the control of the drive (18, 29) for changing the position of the balloon thread guide eye (9).
2. Workstation (1) of a two-for-one twisting or cabling machine according to claim 1, characterised in that the device for capturing a measurement variable (i) is a measuring device (21) that monitors the energy uptake of the spindle drive (3) during the operation of the workstation (1).
3. Workstation (1) of a two-for-one twisting or cabling machine according to claim 1, characterised in that the device for capturing a measurement variable (i) is a time-measuring device (23).
4. Workstation (1) of a two-for-one twisting or cabling machine according to claim 1, characterised in that a sensor device (25) is used as the device for capturing a measurement variable (i), which sensor device (25) captures, during the operation of the workstation (1), the size of a thread balloon (B) revolving around the spindle (2).
5. Workstation (1) of a two-for-one twisting or cabling machine according to claim 1, characterised in that the device for capturing a measurement variable (i) is a thread tensile-force sensor (24).
6. Workstation (1) of a two-for-one twisting or cabling machine according to claim 1, characterised in that a controllable thread tension influencing device (22, 31) is installed in the region of the thread path of a balloon thread (5, 28).
7. Workstation (1) of a two-for-one twisting or cabling machine according to claim 6, characterised in that the thread tension influencing device (22, 31) is in the form of a thread delivery unit.
8. Workstation (1) of a two-for-one twisting or cabling machine according to claim 6, characterised in that the thread tension influencing device (22, 31) is in the form of a thread brake, by means of which the thread tension of the balloon thread (5, 28) can be set.
9. Workstation (1) of a two-for-one twisting or cabling machine according to claim 1, characterised in that the control device (20) is designed such that signals related to a certain event at the workstation (1) in question, e.g. spindle start, thread break, run-time end or lot change, are used for defined control of the drive (18, 29) of the balloon thread guide eye (9) and for the positioning of the balloon thread guide eye (9) in an associated working position (AP₁) or a rest position (RS).
10. Workstation (1) of a two-for-one twisting or cabling machine according to claim 1, characterised in that the control device (20) is designed such that the control device (20) ensures, during the operation of the workstation (1), that the balloon thread guide eye (9) is moved from a first working position (AP₁) into a second working position (AP₂) in order to reduce the energy uptake of the spindle drive (3).
11. Workstation (1) of a two-for-one twisting or cabling machine according to claim 10, characterised in that the second working position (AP₂) of the balloon thread guide eye (9) is arranged between the first working position (AP₁) and the rest position (RS) of the balloon thread guide eye (9).

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