EP0746644B1 - Process for moving the thread in a position for changing the traveller and device therefor - Google Patents

Abstract

PCT No. PCT/CH95/00264 Sec. 371 Date Aug. 5, 1996 Sec. 102(e) Date Aug. 5, 1996 PCT Filed Nov. 13, 1995 PCT Pub. No. WO96/19602 PCT Pub. Date Jun. 27, 1996A lever (30) is pivotably mounted about ax axis Z on a carrier journal (24) which is pivotable about an axis X and with which electromagnets (46, 48) cooperate. The lever carries a thread-receiving member (20) and is under the effect of a tension spring (42). When the thread is intercepted by the thread-receiving member during the forward rotation of the cop, there follows a deflection of the thread-receiving member, which takes place with the tension spring being tensioned at the same time and which is caused by the thread, on a path approximate to the movement of the traveller on the ring. The tensioned tension spring pivots the thread-receiving member during the paying-out of thread which occurs as a result of the subsequent reverse rotation of the cop. As a result of the intermediate blocking about one of the axes, the thread-receiving member moves on a path lying approximately in a tangential plane relative to the ring. Starting from the old traveller retained on the ring, the thread is stretched on a threading-in zone extending in this plane. During the attachment of the new traveller onto the ring, the thread is grasped on the threading-in zone and is thereby threaded into the ring.

Description

The invention relates to a method according to the preamble of claim 1.

Such a method is known from DE-OS 4230736. For the time being, the cop is turned backwards by one Thread reserve by unwinding thread from the bobbin create. Interlocking moving combs, between which the thread extends through, lay the Thread reserve in loops between the comb teeth. The on the old runner sitting on the ring is then placed in a predetermined one Circumferential position spent on the ring, for which the cop forward twisted and thread between the comb teeth must be pulled.

The thread is then from both sides of the runner a catch hook and sought in opposite directions on a predetermined path with respect to the ring spanned. The thread length required for this is from the Thread reserve retightened. Before or when putting on the new one Runner on the ring, this runner catches the thread in the part stretched between the catch hooks. In connection to inserting the new runner becomes the rest of the thread reserve wound up on the cops again.

Searching and grasping the thread unwound from the cop lie steps that make the economy of the known Can question the procedure. Even if both catch hooks find the thread around this in the predetermined path at least there is the problem, the danger to counter a thread break during tensioning. The one for that The thread length required to clamp on the ring is relatively large and initially had to be processed in a time-consuming manner. Around To avoid thread breakage, the tension must be under Limit the thread tension take place by the two Thread hook is exercised. To make matters worse, the thread length is needed on both sides of the ring traveler, but only one of which is directly connected to the reserve Can be pulled from the side. The runner change takes it takes a relatively long time.

The object of the invention is to create a method that the tensioning of the thread is essential for threading simplified and can be carried out without major delay leaves.

The invention solving this problem is due to the measures characterized by claim 1.

Since here a search. Detecting the thread above Positioning of the old runner and the Thread is detected without a thread reserve being formed beforehand preparatory steps and times. This method is reliable and elegant the search for the thread in so far as it deals with the Kopsum automatically puts in the catch position. On the other hand the runner wrapped in thread as a result of the cop movement positioned, it can be used for clamping of the thread on the threading section as one of its end points be used. This shortens the thread length required and pulling thread out on two sides avoid yourself.

The invention also relates to a device having the features of claim 7.

The invention accordingly results in a device the conditions at the spinning station takes advantage, namely on the one hand the well-known course of the Thread orbit during the cop rotation and on the other hand the Ring positioned old runner. Based on that works the device is extraordinary despite its simple design reliable and takes little time to complete Rotor change process. For reliability of great importance that the device itself a single thread take-up organ for thread engagement does what the risk of thread breaks when changing the rotor significantly belittles.

By using the attacking on the thread take-up organ Energy storage means is caused when clamping tensile forces effective on the thread in the threading section do not exceed the dimension which the thread conveys the same thread take-up element itself beforehand transferred. Thread breaks during the bobbin change are effectively avoided.

Fig. 1

schematisch im Grundriss eine Spinnstelle einer Ringspinnmaschine mit einem die erfindungsgemässe Vorrichtung umfassenden Läuferwechselapparat in der Läuferwechselstellung;

Fig.2

eine schematische und perspektivische Darstellung der erfindungsgemässen Vorrichtung in einer ersten Arbeitsstellung;

Fig. 3

die Vorrichtung in der Darstellungsart nach Fig. 2, jedoch in einer anderen Arbeitsstellung;

Fig. 4-9

die Schritte des erfindungsgemässen Verfahrens;

Fig. 10

der Spindelhilfsantrieb des Läuferwechselapparates.

The method according to the invention and the device according to the invention are explained below using an exemplary embodiment and referring to the drawing. Show it:

Fig. 1

schematically in plan a spinning station of a ring spinning machine with a rotor changing apparatus comprising the device according to the invention in the rotor changing position;

Fig. 2

a schematic and perspective view of the inventive device in a first working position;

Fig. 3

the device in the representation of Figure 2, but in a different working position.

Fig. 4-9

the steps of the method according to the invention;

Fig. 10

the spindle auxiliary drive of the rotor changing apparatus.

With R in Fig. 1 is that of a not shown Spinning ring arranged spinning ring of a single spinning station called a ring spinning machine. A thread Y that through one arranged above a spinning spindle S, not shown balloon limiter extends by a rotor T 'located on the spinning ring R in order to then on the bobbin sitting on the spinning spindle S. K accumulate. In the spinning operation, the spinning spindle S in Driven clockwise in a known manner, so that the Runner T 'revolves in the same direction.

For the time being, the method according to the invention for Moving the thread for threading, related changing the rotor at a spinning position, explained become. In this case, reference is made to those resulting from FIGS Movements referenced.

This procedure begins with the fact that one at the affected spinning position by turning the cop K briefly Y thread and thus also the runner T 'over a distance orbits at the spinning ring R. During the run this route you catch one leading to the runner Thread section. This can be done reliably manage that the thread Y in immediate Neighborhood of the ring, i.e. on a well-known track, expected (Fig. 5). In a further step, you tension a thread section to a threading section Y1, the to the ring has a predetermined position and direction. For now To do this, move the thread by means of further thread circulation Runner T 'in a suitable position and holds it there relative to the ring R (Fig. 7). You save over one by turning the cop after catching the Thread created a force. Exclusively this stored force is used to pull thread Clamping on the threading section, with which the thread tension automatically limited to a permissible level remains.

This threading section begins or has one of its end points on the held runner T '. To for the threading section Gaining the required length of thread is preferred thread from the cop K immediately during tensioning handled. The subsequent placement of the new runner T '' on the ring can be done for example in a way which is known from EP-A1-0505715. The new Runner T '' is on a predetermined path and with it Back first, led from the radially outside to the ring R. In the present case, it is the train one that crosses the threading section Y1. At least with C-shaped or similarly profiled runners the further movement leads directly to a hooking on Ring flange. The new rotor T '' thus grips the thread necessarily before touchdown (Fig. 8). In the patch Runner T '' the thread is thus threaded.

In a further step, the new one Connect the runner and the old runner, you move the thread again by twisting the cops and check, whether the runner was taken on the ring becomes. This allows positive feedback on the im Frame of the runner change carried out without errors or win completed proceedings.

Before the device according to the invention is explained, should on the necessary in the operational context Runner change apparatus can be entered. The one with 2 in general designated rotor changing device is on the ring spinning machine temporarily, e.g. for the runner change on everyone Spinning positions of the same can be moved longitudinally, attached. For every runner change the apparatus 2 is stationary one Spinning station opposite and in one for the runner change suitable position on the spinning ring R. The apparatus 2 comprises on the one hand a changing device 4, for example formed in the manner shown in EP-A1-0505715 is. In addition, part of apparatus 2 is a comparison in addition to the known changing device Auxiliary drive 6 (Fig. 10) for the spindle S, hereinafter referred to as the drive. The presence of one such drive is based on the objective, namely in the present case the change of runners with existing, perform intact thread.

As can be seen from FIG. 10, the drive 6 comprises one electric drive motor 12 via a lost motion clutch 13 and a flexible shaft 14 with a friction wheel 15 on the one hand and connected to a ratchet wheel 16 on the other is. The ratchet wheel 16, which has a suitably toothed peripheral surface possesses, a lifting hook 18 in still to be explained Assigned way. Means not shown keep the friction wheel 15 engaged for changing the rotor Kops K.

Finally, the apparatus 2 is the device according to the invention 10, hereinafter referred to as a movement device, assigned, the structure of which is explained with reference to FIGS. 2 and 3 becomes. The drive 6 and the movement device 10 are together with the changing device 4 of spinning station movable to the spinning position, the friction wheel 15 additionally is movable approximately across this direction of travel. The apparatus 2 is equipped with a programmable controller, which enables autonomous operation on the spinning machine.

The movement device 10 comprises a movable part stored, fork-shaped thread take-up element 20, which is pivotable on predetermined tracks. in the illustrated embodiment is that Thread take-up member 20 on the changing device 4 gimbal mounted. Specifically, a bearing element 22 is on the changing device 4 rigidly attached, in which a Carrier pin 24 about an approximately horizontal axis X is pivotally mounted. On the support pin 24 is a Swivel bearing 26 rigidly attached, in which an axle journal 28 of an L-shaped lever 30 is pivotable about an axis Z. is stored. The lever 30 carries on its from the journal 28 distal end of the thread take-up member 20. The axis Z is in

a radial plane of the axis X pivotable. In the 2 runs the pivot position of the carrier pin 24 Axis Z approximately horizontal. The parts 22 to 28 form one Cardan joint for the thread take-up member 20, the Axes X and Z represent the gimbal and joint axes.

On the support pin 24 there are a stop arm 32 Actuating plate 34 and a signal plate 36 rigid attached. With the journal 28 are a tension arm 38 and a signal plate 40 non-rotatably connected. An energy store in the form of a tension spring 42 is at 44 on the Change device 4 rigidly anchored and engages the tension arm 38 on. The actuating plate 34 are two electromagnets 46 and 48 with return springs 47 and 49 assigned and with the stop arm 32 act in end positions to be explained an adjustable stop screw 50 bwz. an inductive Sensor 52 together. Further inductive sensors 54 and 56 and 58 are the two metallic signal plates 36 and 40 assigned. With the support pin 24 is an adjustable Stop screw 60 connected to the under the Preload of the tension spring 42 supports the tensioning arm 38.

2 and 3, the parts of the movement device are in a first or in a further work situation physically shown. In addition, these figures contain schematics the positions denoted by a) -f) and by simple lines indicated movement paths of the thread organ. On the positions or locations is in the course of Explanation of the operation of the device in context with the description of the rotor change process 4 - 9 are received.

For now, it should be mentioned that the actual runner change program in apparatus 2, preferably using one of the Change device 4 associated shift shaft, stored is. When rotating, this can be done using appropriate switching or Actuate control cam switching elements. Furthermore, can such a selector shaft must be able to drive tools, to make appropriate movements. For example a shift shaft can be used, the similar to the drive shaft according to the aforementioned EP-A1 is. Work tools directly from the shift shaft are preferably the ring traveler lifting device and the insertion device. Both tools belong the changing device 4. For the purposes of the following Explanation applies that the shift shaft for everyone Rotor change a predetermined rotation, e.g. a full one Revolution without interruption and preferably with constant Speed of rotation.

In the starting position of the movement device 10, in which this for the rotor change at a spinning station is ready for use, the spring 47 stops by action the actuating plate 34 the carrier pin 24 in one Rotational position in which the thread take-up member 20 is in a rest position a) (indicated by dash-dotted lines in FIG. 2) located. In this rest position, the thread take-up member 20 both outside the machine profile and therefore also held outside the balloon area of the spinning station. Fig. 4 shows the corresponding position of the Thread take-up member 20 relative to the spinning ring R in Layout. The stop arm 32 is also in the dash-dotted line and the stop screw 50 distant location. The presence of the stop arm 32 in this position sensor 52 registers what symbolized by the plus sign in sensor 52 is, however, this has no immediate consequence. The same applies to the signals from sensors 56 and 58 both register the presence of signal plate 40. In Figure 4 is the system of the electromagnet 46 on the Actuating plate 34 indicated.

1 automatically for example Runner change process of apparatus 2 to be initiated begins when the drive of the selector shaft is switched on. Their Rotation causes excitation of the train magnet Electromagnet 46. This will over the actuator plate 34 the rotation of the support pin 24 about the X axis enables. This triggered by the electromagnet 46 Twisting causes the thread take-up member to deflect 20 from the rest position into a working position b), which is shown in FIG is shown in solid lines and which of the situation in corresponds to the representation according to FIG. 5. The stop arm 32 runs on the stop screw 50, whereby the Swiveling in a position determining the work situation of the support pin 24 is limited. The sensor 54 detects reaching this position by the moving signal plate 36. The importance of the working situation b) of Thread take-up member 20 becomes from below explained connection obviously.

In any case, the sensor 54 registers the reaching of Working position of the support pin 24 and thus the Thread take-up member 20 and switches the drive 6 or whose electric motor 12 in the forward direction of rotation. In this direction of rotation is normally, i.e. in the Spinning, by the rotation transferred to the cop K, here clockwise (Fig. 5), thread Y on this wound up. As is known, the Kops rotation has one in the same direction orbital movement of the rotor T 'on the ring R result. It will be the runner from Thread Y dragged along. The thread take-up member 20 is in working position b) above and immediately above the spinning ring R in the orbit of itself thread extending between balloon limiter and rotor T ' Y. In addition, the thread take-up member 20 is approximately in Counterclockwise open. As a result, it leads through the Rotation of the cop K clockwise generated the rotation Thread now for automatic entry into the Thread take-up member 20. The thread Y caught and by hanging it on Thread take-up member 20 a tensile force effective. This leads to Deflection of the thread take-up member 20 as Result of the direction of pull, to a composite Movement according to the intended degrees of freedom. To the one, the support pin 24 is pivoted about the axis X. On the other hand, the lever 30 is deflected around the pivoted axis Z. Both movements affect each other the tension arm 38 and the tension spring 42. The mainspring 42 is further tensioned by the thread transferred Traction is stored in this. The thread take-up organ 20 can thanks to the compound movement of the web of the rotor T 'on the ring R, which is indicated by the in Fig. 6 shown position is indicated. Especially from the Location of the stop arm 32 to the stop screw 50, the Signal plate 36 to the sensor 54 and that of the tension arm 38 to the stop screw 60 in Fig. 3 are involved Movements visible.

The sensor 54 registers the pivoting of the signal plate 40 and thus delivers a signal that reaching a predetermined position c) of the thread take-up member 20 means. The position c) is approximately that of FIG. 6 and that Signal stops drive 6. Fig 6 is for the location of the runner T 'also representative at this shutdown.

Occurs within a predetermined period of time since power on of the spindle drive at the start of the change process no signal from sensor 54, then this means e.g. that there is no thread at the spinning position because there was a thread break before. In the illustrated embodiment the rotor change process is canceled. The drive 6 is stopped by the apparatus control and the control shaft turned back to the starting position. The Apparatus 2 is then used to change the runner on one next spinning position free. Whether a basically also at missing thread possible runner change is carried out, is obviously without in the present context Matter.

Under normal conditions at the spinning position Switching shaft meanwhile actuated the rotor lifting device and the lifting hook 18 (see Fig. 10) placed on the ring R. The drive then switches on immediately second time in the forward direction, i.e. clockwise the Kops K turned on, but this time through the switching shaft. Thus, the runner T 'who is at the deflection of the thread take-up member 20 was also carried along, on the lifting hook 18 and in the effective range of this assigned ratchet wheel 16 drawn. When the Kops K clockwise leads this ratchet wheel 16 in turn a clockwise rotation and moves the rotor T ' by dragging into a on the lifting hook 18th blocked location. This also blocks the ratchet wheel 16 itself, whereby the electric motor and the friction wheel 14 are blocked, i.e. suddenly stopped. This prevents the Pulling force on thread Y increases. So that's what comes Thread take-up member 20 in an equilibrium position d) Standstill, which is close to the blocked rotor T ' located, but is in any case distant from it. The corresponding positions of the rotor T 'and the Thread take-up member 20 result from FIG. 7.

The shift shaft has more suitable after a time interval Duration causes the reversal of the electric motor 12 and the cop K is now rotated counterclockwise. Accordingly thread Y is unwound from it and reduced thereby the effective on the thread take-up member 20 String of threads. The saved as additional spring tension Energy therefore has a tendency to the thread take-up member 20 to move in the sense of reducing this energy. However, when the drive 6 was reversed, triggered by the shift shaft, also the electromagnet 48 excited. This prevents this via the actuating plate 34 Swiveling the support pin 24 from the position according to Fig. 3. A movement of the thread take-up member 20 about the X axis is therefore impossible. Therefore, the Relaxation of the tension spring 42 by pivoting the Thread take-up member 20 exclusively around the Z axis surrender. Its path on which unwound thread Y is therefore taken in an imaginary, the Ring R cutting and approximately vertical plane. Due to the spatial orientation of the Axes X and Z is this plane transverse to the direction of movement of the rotor insertion mechanism. The thread Y will now spanned in this plane until the sensor 58 responds. 8 is the corresponding end position e) of the Thread take-up member 20 shown, the between Thread take-up member and runner T ', one Thread Y forming thread Y1 can also be seen is. The one The threading section Y1 just formed runs in elevation viewed and starting from the runner T 'slightly upwards inclined, but immediately above the surface of the ring R.

The unwinding of thread Y from the Kops K, triggered by the Switching shaft, is due to pivoting of the signal plate 40th together with the thread take-up member 20 by the signal of Sensor 58 has been terminated. It should be added that the Reverse rotation of the electric motor 10 no unblocking the Lock wheel 16 or no release of the blocked rotor T ' has the consequence. The corresponding reverse rotation will taken up by the lost motion clutch 13.

The rotor insertion device is now triggered by the selector shaft actuated and thereby by means of an insertion hook 19 the same a new rotor T '', in against the ring R. open orientation, brought up. The directed towards the ring R. Path of movement of the hook or slider T '' crosses approximately at right angles or cuts directly Threading section Y1. The new rotor T '' detects it forcibly the thread Y before the insertion hook 19 put it on the ring R. Located then the rotor T '' on the ring R, is in it Y thread included or passed. From this fact will be used later, which is further below is still received.

The insertion hook 19 is moved by means of the selector shaft Reached the touchdown position withdrawn to the starting position. Now the thread can be grasped in the new rotor T '' is, the old runner T 'can be removed from the ring R. This is done by the switching shaft Retraction movement of the lifting hook 18. Has the old runner T 'released the ring, then the thread Y slides out of the the former out. The drive shaft now becomes the drive 6 switched on in the forward direction. The pulls in Winding direction rotating cops K on the thread Y what on the rotor T '' and on the thread Y still containing Thread take-up member 20 also affects. At still attracted electromagnet 48 leads to a Back pivoting of the lever 30 about the Z axis against Force of the tension spring 42. The thread take-up member 20 is in the position f) pivoted. The sensor 58 detects the Corresponding lever pivoting by a predetermined path Movement of the signal plate 40.

The response of the sensor 58 immediately causes this Shut down the drive 6 and cause the magnets 46 and 48 fall off. Under the action of the return spring 47, which overcomes the force of the tension spring 42 becomes the support pin 24 pivoted about the axis X. This leads for the time being for a withdrawal of the thread take-up member 20 approximately in radial direction. The new runner T '' leading thread Y released. The magnetic spring 47 can relieve and pivots the thread take-up member 20 Axis Z in the starting position a).

That in a predetermined time interval, e.g. since switching on of the spindle drive or the cop rotation Response of the sensor 56 is from the control device as a message for the successfully completed Carrier change process understood. This message, itself qualitatively different from the fact that the Completion of the rotary movement of the selector shaft determined can be linked to a signal from sensor 52 the rotor changing device for moving to the next Spinning position free. Alternatively, the control device trigger this movement.

It is understood that the spring characteristic and the Bias of the tension spring 42 on the present Circumstances and especially on tensile strength values of the thread are matched.

The gimbal-mounted thread take-up element 20 and the one with these moving parts are designed with low mass. The resulting forces on the thread are accordingly or the tensile stresses occurring at any time in one ultimately limited size by the spring. Since that Pulling thread through the acting as an energy store Spring occurs and at most generate tensile stresses in the thread can this thread when storing power itself should have broken threads caused by excessive tensile stresses, therefore do not occur. At Proper thread material can also be placed on the no new runner or when removing the old runner Thread breakage arise.

After a predetermined time interval, no successful Signal indicating rotor change from sensor 56, then the change process is canceled. As the cause of the error comes e.g. the lack of new runners in the changing device 4 into consideration. The control device can be set up be to register the unsuccessful runner change, to an operator according to a predeterminable Number of malfunctions an acoustic and / or visual To deliver a signal or to shut down the rotor changing device 2. Usually the apparatus 2 is allowed, too after an unsuccessful runner change process to go to a next spinning station.

It is understood that the energy storage also others Shapes, e.g. by storing location energy. Instead of a single energy storage device, which is created by movements around both axes, i.e. Pivoting of the carrier 24 as well as pivoting the pivot take up energy or can deliver, can be basically the same The result of each axis is its own energy storage assign.

From the above explanations it can be seen that the Overall movement device have small dimensions can. This leaves the dust encapsulation of the bearings etc. same, although little space is available. The Movement device also has the advantage of Assignment of the sensors to the carrier and to the axle journal Monitoring the rotor change process from a distance, i.e. from outside the ring area.

Claims (13)

1. A method of moving the thread into a position for changing the ring traveller on a ring spinning machine, in which thread unwound from the cop by retrorotation is tensioned on a predetermined path adjacent the spinning ring, during which process a threading section (Y1) is formed, and is taken up by a new traveller as this is fitted onto the spinning ring, characterised in that during forward rotation of the cop, the thread is picked-up and, starting from whichever was the old traveller, it is tensioned solely towards one of its sides in order thus to form the threading section (Y1).
2. A method according to claim 1, characterised in that during forwards rotation of the cop and after pick-up energy is stored via the thread pull and tensioning of the thread is carried out solely by the previously stored energy.
3. A method according to claim 1 or 2, characterised in that the length of thread required for tensioning on the predetermined path is gained directly by retrorotation of the cop during tensioning.
4. A method according to one of claims 1 to 3, characterised in that, for pick-up, the thread is awaited in the immediate vicinity of the ring on an encircling path and in that for tensioning the thread, the old traveller is, as the end of the predetermined path, held fast in relation to the ring.
5. A method according to claim 1, characterised in that energy is stored by the driving of a thread pick-up means which takes up the thread by the action of the thread pull and in that when this energy is released the threading section (Y1) is formed on a predetermined path.
6. A method according to claim 5, characterised in that release of the stored energy is triggered by retrorotation of the cop.
7. A device provided on the traveller changing assembly for ring spinning machines and intended for moving the thread, with a movably mounted thread pick-up means (20) comprising a receiver for the thread and engaged by means (42) for tensioning the thread at the spinning ring (R) in a threading section (Y1), characterised in that a single thread pick-up means (20) is provided which has a plurality of degrees of freedom and a predetermined thread pick-up position and in that energy storage means are provided which engage the thread pick-up means (20) and which, upon forwards rotation of a cop, store energy transmitted from the thread to the thread pick-up means (20) and deliver to the pick-up means (20) during retrorotation of the cop, energy stored by the energy storage means and in that the thread pick-up means (20), upon relaxing of the energy storage means, passes through a predetermined path moving away from the spinning ring (R) in order to construct thereby the threading section (Y1).
8. A device according to claim 7, characterised in that the thread pick-up means (20) is mounted for universal movement and in that the guide means comprise a blocking member (48) for blocking pivoting about one of the two axes (X) of the universal mounting.
9. A device according to claim 8, characterised in that the energy storage means (42) is disposed in order to counteract movement of the thread pick-up means (20) about both universal axes (X,Z) by the action of thread pull during cop rotation and in that the blocking member (48) is constructed to be actuated by the traveller changing assembly (2).
10. A device according to claim 9, characterised in that the energy storage means (42) is disposed so that upon blockage of the thread pick-up means (20) about one of the axes (X), relaxation is allowed by pivoting about the other of the axes (Z).
11. A device according to one of claims 8 to 10, characterised in that the energy storage means is a traction spring (42) and in that the blocking member is an electromagnet (48) constructed to be energised by the traveller changing assembly (2).
12. A device according to claim 7, characterised in that the thread pick-up means (20) is mounted on a carrier journal (24) adapted to pivot by its journal (28) about an axis (Z) and which is for its part mounted on a changing device (4) so that it can pivot about an axis (X), the axis (X) of the journal extending at right-angles to the axis (X) of the carrier journal, this latter axis extending substantially crosswise to the direction of movement of an inserted hook (19) of a traveller inserting device and in that a pretensioned drawspring (42) is connected to the journal (28) and in that pivoting about the axis (X) of the carrier journal is retroactive on the drawstring (42).
13. A device according to claim 12, characterised in that in accordance with predetermined positions of the thread pick-up means (20), sensors (52, 54, 56 and 58) of a device for controlling the traveller changing apparatus are provided on the journal (28) and also on the carrier journal (24).

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