EP2907781A1 - Method, device and computer program for resolving thread ends for splicer - Google Patents

Abstract

The present invention relates to a method for yarn end resolution for a splicer comprising the steps of: (i) cutting the thread through a cutting device of the splicer, wherein the thread is in the catchment area of a holding and Auflöseröhrchens the splicer, (ii) no later than after cutting the Threading of a suction flow to the holding and Auflöseröhrchen, (iii) sucking the thread end by the voltage applied to the holding and Auflöseröhrchen suction flow into the holding and Auflöseröhrchen, (iv) dissolution of the thread end by a in the holding and Auflöseröhrchen latest now applied dissolution characterized in that between steps (ii) and (iii) the following step is inserted: (ii.A) conveying the thread end into the catchment area of the holding and dissolving tube by interaction of suction flow and a yarn retraction device. Moreover, the invention relates to a device for carrying out the method and a computer program for loading on a program-controlled device for carrying out the method.

Description

The invention relates to a method and apparatus for Fadenendeauflösung for a splicer and a computer program for controlling such a method.

Such Fadenendauflösungsvorrichtungen in conjunction with splicers have long been known, for example from the DE4420979A1 , In this case, a splicer is a device for connecting two yarn ends, wherein here and below a thread should always be understood to mean a structure consisting of twisted individual fibers.

Before the actual connection, the thread ends must first be prepared. That is, the filament is first cut to length by a cutter of the splicer, after which the filament twist at the filament end is reversed to some length by reverse rotation, which is typically done by pneumatically disentangling the filament twist in a special dissolution tube of the splicer. For this purpose, the thread end is first drawn after cutting to length by a suction flow into the tube to then eliminate it by means of a prevailing inside the Auflöseröhrchens and acting on the thread end Auflöseströmung the thread rotation and wegzublasen loose fibers, so that a so-called dissolved thread end with possible receives many parallel fibers, which then with the fibers of the other thread end to be connected, typically pneumatically, can be spliced again.

The appearance and quality of a splice hang, inter alia. strongly from the yarn end resolution. Only at an optimal resolution results in thread connections whose appearance and strength are not significantly different from the rest of the thread. An optimum splice connection can be achieved, for example, only if the thread ends are prepared in a shape and in a length which are matched to the respective yarn parameters of the thread.

In order to reliably suck the thread end into a dissolving tube, it is sufficient for many types of yarn whose threads have a certain flexibility, ie flexibility, if any part of the thread is in the catchment area of the dissolution tube when cutting to length. That is, if at the latest shortly after the cutting of the thread, the suction flow is applied to the Auflöseröhrchen, it is sufficient in such cases to suck the thread and finally position with the thread end in the Auflöseröhrchen. In these cases, the suction flow typically causes the portion of the thread in the collection area of the disintegration tube to begin to move towards the interior of the disintegration tube, initially forming a loop moving toward the interior of the disintegration tube. Upon further pulling the loop into the Auflöseröhrchen finally slides the thread end into the Auflöseröhrchen until the loop dissolves and the thread is sucked in with the thread end leading into the Auflöseröhrchen.

However, in particular for less flexible, ie rather rigid yarns, the process just described is often unsuccessful or can not be satisfactorily combined with the dissolution flow in the dissolution tube. Thus, it is possible on the one hand that a yarn is so rigid that the strengths of the suction flow which are customary in practice are not at all sufficient for loop formation, so that the yarn can not be sucked in at all. On the other hand, although suction can be achieved in some yarns by a sufficiently strong suction flow, these suction flows often prevent optimal resolution thereafter.

To understand the latter, it must be pointed out that the suction and dissolution flows are not independent of each other. Thus, usually only uniform nozzles are used in the dissolution tube, that is, in the Auflöseröhrchen only one or more similarly arranged nozzles such a medium, ie preferably air or alternatively with water added air, blown that before the dissolution tube, ie at his the Thread facing side, a suction tube directed into the suction, while the Auflöseröhrchen on the one hand, a thread rotation dissolving vortex arises, but at the same time further into the inside of the Auflöseröhrchens, ie, directed to the end of the Auflöseröhrchens out, on the one hand before the suction flow To ensure the Auflöseröhrchen and on the other hand to carry away the triggered at the Fadenendeauflösung fibers through the end facing away from the thread of the Auflöseröhrchens. But even if you have different types of nozzles for the Auflöseröhrchen, can be suction and Do not completely decouple the dissolution flow, since, for example, the suction flow must ultimately always bring about a suction in the direction of the end of the dissolution tube facing away from the thread, which in any case also influences the part of the thread located in the dissolution tube and thus its dissolution.

That is, as a result, the suction flow always has some effect on the yarn end resolution and therefore can not be arbitrarily set to overcome the bending stiffness of the yarn to be taken in any case.

In order to ensure a reliable sucking in particular also more rigid yarns, the already mentioned suggested DE 4420979 A1 Therefore, to arrange the cutter in the immediate vicinity of the mouth of the Auflöseröhrchens. In particular, if you then additionally tilts the Auflöseröhrchen in the direction of the cutting device, then you can suck in many cases, even more rigid yarns satisfactorily.

While this solution for quite rigid yarns is quite justified, the immediate vicinity of the cutting device and Auflöseröhrchen also brings disadvantages. Of course, this immediate neighborhood considerably restricts the constructive freedom in the arrangement of the components of the splicer. Also, it is structurally not possible to bring the cutting device and Auflöseröhrchen arbitrarily close to each other, since the Auflöseröhrchen yes must be mounted as a cavity within a block of material to which the cutting device can be at best adjacent. In any case, the thread end is outside the mouth of the Auflöseröhrchens and so the suction still requires a, if only small, looping of the thread for the Einsaugvorgang, which can lead to particularly rigid yarns can not really be sucked with this method reliably ,

It is therefore an object of the present invention to provide a method for yarn end resolution for a splicer, which at least reduces the problems described and in particular allows the reliable sucking even more rigid threads in a Auflöseröhrchen without imposing strong constructive restrictions on the choice and assembly of its components splicer ,

1. (i) Ablängen des Fadens durch eine Schneidvorrichtung des Spleißers, wobei sich der Faden im Einzugsbereich eines Halte- und Auflöseröhrchens des Spleißers befindet,
2. (ii) Spätestens nach dem Ablängen des Fadens Anlegen einer Saugströmung an das Halte- und Auflöseröhrchen,
3. (iii) Einsaugen des Fadenendes durch die am Halte- und Auflöseröhrchen anliegende Saugströmung in das Halte- und Auflöseröhrchen,
4. (iv) Auflösung des Fadenendes durch eine im Halte- und Auflöseröhrchen spätestens nun angelegte Auflöseströmung,
   dadurch gekennzeichnet,
   dass zwischen die Schritte (ii) und (iii) folgender Schritt eingeschoben wird:
   • (ii.A) Beförderung des Fadenendes in den Einzugsbereich des Halte- und Auflöseröhrchens durch Zusammenspiel von Saugströmung und einer Fadenrückzugsvor richtung.

The object is achieved by a method for yarn end resolution for a splicer with the following steps:

1. (i) cutting the filament through a cutting device of the splicer, the filament being in the draw-in area of a holding and disintegrating tube of the splicer,
2. (ii) at the latest after cutting the thread, applying a suction flow to the holding and dissolving tube,
3. (iii) sucking the thread end through the suction flow fitting the holding and dissolving tube into the holding and dissolving tube,
4. (iv) dissolution of the thread end by means of a dissolving flow applied at the latest in the holding and dissolving tube,
   characterized,
   that the following step is inserted between steps (ii) and (iii):
   • (ii.A) Transport of the thread end in the catchment area of the holding and Auflöseröhrchens by interaction of suction flow and a Fadenrückzugsvor direction.

The object is also achieved by a device for thread end resolution for a splicer, wherein the device has the following components simultaneously belonging to the splicer, namely a cutting device, a holding and Auflöseröhrchen and a yarn retracting device, and wherein the device comprises at least one control device,
characterized,
the components belonging to the splicer are structurally arranged in relation to one another and the control device is set up in such a way that in its operation the device carries out the method for thread end resolution for the splicer which has just been described.

Furthermore, the object is achieved by a computer program for the yarn end resolution device just described for a splicer, wherein the control device of the device is program-controlled,
characterized,
that the device when the computer program on the control device runs in its operation the just described method for yarn end resolution for the splicer executes.

In contrast to the prior art, therefore, the proposed method does not require that the thread end is already in the immediate vicinity of the Auflöseröhrchens when cutting, but it is sufficient that any part of the thread is in the catchment area of a Auflöseröhrchens the splicer.

It is important to apply the suction flow to the dissolution tube in time so that it can hold the thread near the dissolution tube. That is, at the latest, the suction flow must be applied shortly after the thread is cut to prevent the thread from falling down by gravity and leaving the catchment area of the dissolution tube. It is more favorable, however, if the suction flow is already applied during cutting or even before cutting to length. As a result, in the process according to the invention, the dissolution tube now not only has the task to suck in the thread and dissolve the thread end, but additionally exerts a holding function on the thread until the time of suction, which is why the dissolution tube in the claim formulation and in the following also more apt is called holding and Auflöseröhrchen.

The invention thus does not provide, in contrast to the prior art, that the thread end is sucked in immediately after cutting, but the thread retraction device first pulls the thread back, with the thread end moves away from the cutting device in the direction of the holding and Auflöseröhrchens and the suction flow ensures that the thread remains in the catchment area of the holding and dissolving tube during the entire retraction process. Finally, the thread end approaches so far the holding and Auflöseröhrchen that the suction flow can suck it into the holding and Auflöseröhrchen, the point of the necessary approach of the thread end to the holding and Auflöseröhrchen depends on the bending stiffness of the thread.

Since the invention thus provides a retraction movement of the thread end direction holding and Auflöseröhrchen after cutting the thread, eliminating the requirement in the prior art restriction that cutting device and holding and Auflöseröhrchen must be immediately adjacent, whereby the distance of the cutting device and the holding and Auflöseröhrchens can be freely optimized according to the other criteria of Fadenendeauflösungs- and Fadenspleißprozesses.

Further, since the retraction movement of the thread end is not limited, so it can also be performed to the point where the thread end itself reaches the mouth of the holding and Auflöseröhrchens, extremely rigid threads can still be reliably absorbed, as in this positioning of the Thread end for sucking no more looping of the thread must be made, but the Einsaugvorgang immediately with the thread end ahead, so with the thread end toward the interior of the holding and Auflöseröhrchens pointing begins.

In which position of the thread end of the Einsaugvorgang finally uses depends on the flexibility of the thread and is for the reliability of the suction also not important. Because if the retraction movement is always carried out in extreme cases to the point at which the thread end is located in the mouth region of the holding and Auflöseröhrchens, the Einsaugvorgang will always be successful. If, for more flexible yarns, the suction process has already been used before, further retraction merely causes the thread end to be transported somewhat towards the thread-like end of the holding and dissolving tube, but the catchment area of the holding and dissolving tube is never left in this case either ,

However, such unwanted retraction of a once soaked yarn is not desirable because it affects the exposure time of the dissolving flow to the yarn end, which, as mentioned above, in turn also constitutes an important factor for optimum yarn end resolution. Therefore, the invention advantageously provides for terminating the retraction movement when the thread has been absorbed.

As just said, it is thus particularly advantageous for higher bending stiffness, when the yarn retraction device in step (ii.A) positioned the yarn end in the catchment area of the holding and Auflöseröhrchens that the voltage applied to the holding and Auflöseröhrchen suction flow leading the thread with the thread end sucked into the holding and Auflöseröhrchen.

To optimize the Fadenendeauflösung itself, it is important, as already indicated, that the thread end is sucked up to a certain position in the holding and Auflöseröhrchen, so a thread piece of certain length of the dissolution flow is suspended in the holding and Auflöseröhrchen. For this purpose, the invention provides in a development that the yarn retraction device releases the thread after sucking in the thread end something again to allow a deeper suction into the holding and Auflöseröhrchen until the optimal thread length is in the holding and Auflöseröhrchen.

For some types of splicer, it makes sense to use existing thread transfer devices as thread retractors anyway in the splicer. Here is particularly to think of the so-called feeder, which serve in a splicer to further retract the two threads to be connected after preparation of their thread ends until the thread ends come to lie in the splice channel with an optimal overlap length of the two threads.

Alternatively, however, the thread withdrawal device can also be realized by a separate component, which then only takes over tasks in the Fadenendeauflösung. This has the advantage that the components for the yarn transport at Fadenendeauflösung and e.g. can be optimized separately when positioning the thread ends in the splice channel, which may be advantageous in some splitter types depending on the geometric arrangement of the individual modules of the splicer.

Such a separate component for yarn transport at yarn end resolution saw, for example, the already mentioned DE 4420979 A1 before, who called this component looper and as concrete embodiments, a rotary wing, a thread-pulling device and a pneumatic device, ie specifically provided a slot-like, running in the direction of yarn direction mouth region of a suction nozzle. However, the recognized DE 4420979 A1 not the inventive uses of such a loop former, but limited itself to form before the cutting of the thread a thread reserve in the form of a loop, which was then used after cutting and immediate sucking the thread end to suck the thread further into the holding and Auflöseröhrchen to let to increase the length of thread to be resolved.

Ideally, when using a separate rotary wing as a thread retracting device of this thread in contrast to DE 4420979 A1 not in the immediate vicinity of the holding and Auflöseröhrchens grab and deform into a thread reserve loop, but it would change constructively so that it forms the loop, for example, on the side facing away from the holding and Auflöseröhrchen side of the splice. Because in a like in the DE 4420979 A1 described construction of the rotary wing would run the risk that if the thread in the vicinity of the holding and Auflöseröhrchens with subsequent thread transport through the rotary wing away from the holding and Auflöseröhrchen the thread would leave the catchment area of the holding and Auflöseröhrchens, whereby the suction flow of Holding and Auflöseröhrchens could no longer fulfill their holding function.

The same remark naturally applies to any yarn retraction device. That is, each yarn retraction device must grasp and move the thread so that the thread does not leave the catchment area of the holding and dissolving tube. This can e.g. happen that the yarn retraction device does not move the thread away from the holding and Auflöseröhrchen, so that the movement of the thread in the mouth region of the holding and Auflöseröhrchens is a pure rectilinear withdrawal movement of the thread. Such a movement can, as mentioned in the previous section, e.g. achieve by using a loop forming, which forms the loop on the side facing away from the holding and Auflöseröhrchen the splice channel. Because then gives the splice channel caused by the looping direction change of the thread not to the holding and Auflöseröhrchen side facing the splice on, but the thread path between splice and Halteund Auflöseröhrchen remains unchanged. Since the feeders usually seize the thread on the side facing away from the holding and Auflöseröhrchen side of the splice, they meet exactly the desired condition.

The thread retracting device can, of course, depending on the splitter type, other functions are transferred. In particular, further functions in the area of yarn end preparation must be considered. For example, the DE 3305479 A1 before cutting off the threads after dissolving their thread ends again, ie, to remove the outermost thread part, as this could have received an inhomogeneous structure by the dissolution process, so as to only the homogeneous part of the dissolved thread end left allow. For that saw the DE 3305479 A1 before, the thread after Fadenendeauflösung by a thread catcher there called yarn retraction device again pull something out of the holding and Auflöseröhrchen to then cut off the outermost thread end with a holding and Auflöseröhrchen immediately adjacent another cutting device. This function can also be transmitted to a yarn retracting device according to the invention.

Advantageously, an inventive method for Fadenendeauflösung in a splicer for both threads to be joined, so used both for the so-called upper thread and for it to be spliced so-called lower thread. Because in this case the yarn ends of both threads, which are typically of the same yarn, would be dissolved in a reliable manner.

As already mentioned in the introduction, the optimum settings for the individual process steps of a splicing operation are dependent on the particular yarn to be spliced. Thus, advanced splicers e.g. the displacement of the cutting devices, ie the change in the distance of the cutting device from its associated holding and Auflöseröhrchen. The concrete settings for the splicing of a specific yarn can be carried out in a control unit, e.g. a single winding unit, which is assigned to the splicer, or else in a central control unit of the entire textile machine, which belong to the individual splicer, the settings are stored e.g. can be made by the operator of the textile machine.

If the geometry of the relevant components of the splicer, so in particular the relative position of the cutting devices to their associated holding and Auflöseröhrchen known, the individual working positions of the yarn retractor can be determined purely geometrically. That is, e.g. a winding unit-related or also a control unit which is central to the textile machine can control the movement of the yarn retraction device, depending on the process progress of the operations in the splicer, starting from the cutting of the upper and lower thread to the end of the thread end preparation.

It can be used for the movement of the yarn retracting device advantageously, for example, a the yarn retracting device directly moving electric stepper motor, for which the control device in each case specifies the direction of movement and number of steps. Alternatively, however, the stepper motor can also initially drive a cam disk about its axis, while the outer contour of the cam disk then moves the yarn retraction device via a mechanical gear. Finally, with a fixed geometrical coupling of the individual movement processes in the yarn end resolution, a conventional belt-driven cam can also be used, which codes the entire movement of the yarn retraction device on its outer contour.

However, any purely mechanical movement is always subject to wear of the moving components, whereby play between contacting components and Bewegungshysteresen set with time. Eventually, over time, the actual positions of the components in a sequence of movements may deviate from the precalculated ones. To counteract this, it is known to calibrate component positions as needed, e.g. to approach fixed reference positions by means of fixed stops, which make it possible to reconcile the control with the actual movements. Such a calibration is also for the o.g. Movement of the thread retracting device in geometrically fixed predetermined working positions applicable, with the extreme positions of the movement of the yarn retractor offer as reference positions for calibration. For example, minimal thread retraction at the time of cutting to length, which is therefore a reference position, e.g. by attaching a mechanical stop offers. Accordingly, when using the feeder as a yarn retraction device maximum yarn retraction after insertion of the thread ends in the splice, which could serve as a calibration again.

Alternatively, and a higher reliability over the life bidding but you can also provide a feedback control of the yarn retractor. That is, you can actively monitor the thread position via a sensor and pass it to the control device of the thread retracting device. This can then control the thread withdrawal and also the release of the thread according to the sensor signals until the thread has taken the respective desired positions.

Different types and positions of the sensor or the joint use of multiple sensors are feasible. For example, in the case of yarn monitoring in the prior art, sensors which operate on a capacitive or optical basis are already well known. Specifically, plate capacitors are in use, but also photocells, which the shading caused by the thread, e.g. measure a light emitting diode. In a corresponding structure, these sensors can detect the thread movement and its speed, for which purpose laser diodes are also used, whose self-interference signal can be measured in a laser Doppler anemometry arrangement.

For thread monitoring within the scope of the invention, however, only the arrival of the thread end can be monitored in the mouth region of the holding and Auflöseröhrchens. This could be done e.g. a plate capacitor or a light barrier between the cutting device and holding and Auflöseröhrchen in the immediate vicinity of the holding and Auflöseröhrchens or even in the outer, the cutting device facing part of the mouth region of the holding and Auflöseröhrchens attach. As long as the thread end has not yet passed this sensor, the sensor would give a signal to the presence of the thread throughout the sensor area and the controller would continue to retract the thread by means of the thread retractor until the sensor no longer reported such a thread signal, so the thread end the sensor area reached or left.

The sensor, e.g. attach the plates of the plate capacitor or LED and photodiode of the light barrier either in front of the holding and dissolution tube to each of its sides. It would also be conceivable, however, to attach these elements in the axis of the holding and Auflöseröhrchens before the mouth and within the holding and Auflöseröhrchens.

Of course, the person skilled in the art also has further options for designing the invention details and, in particular, he can combine the variants described here within the scope of the technical feasibility. Thus, if the feeder is used as a thread retracting device, this of course also for the further suck in let the thread end in the holding and Auflöseröhrchen, ie for the enlargement of the sucked into the holding and Auflöseröhrchen thread length.

For carrying out the method, on the one hand, a specially designed device can be used, by using known splicers, e.g. be supplemented by adding a separate thread retractor, or by expanding the feeder control of a known splicer accordingly. The latter can be done for example by special controls. However, it is particularly advantageous if the existing control device of the feeder is programmable and the additional movement can then be implemented by a corresponding computer program or the adaptation of the previously existing computer program.

All such devices as well as the computer programs described are part of the present invention.

In the following the invention with reference to an embodiment shown in the drawings and some of its variants will be explained in more detail.

Fig. 1

in Seitenansicht eine Arbeitsstelle eines Kreuzspulautomaten mit einem Spleißer mit einer erfindungsgemäß ausgestatteten Vorrichtung zur Fadenendeauflösung;

Fig. 2

in perspektivischer Ansicht den Spleißer aus Fig. 1;

Fig. 3a - 3f

in einem schematischen Schnitt durch Fig. 2 die Dynamik der Fadenbewegung während der Fadenendeauflösung;

wobei dieselben Bauteile in allen Figuren mit denselben Bezugszeichen bezeichnet sind.Show it

Fig. 1

in side view, a job of a cross-winding machine with a splicer with an inventively equipped device for Fadenendeauflösung;

Fig. 2

in perspective view of the splicer Fig. 1 ;

Fig. 3a - 3f

in a schematic section through Fig. 2 the dynamics of the thread movement during the yarn end resolution;

wherein the same components in all figures are denoted by the same reference numerals.

In FIG. 1 is a schematic side view of a generally designated by the reference numeral 1 cheesemaking fabricating textile machine, in the embodiment, a cross-winding machine, shown.

As is known, have such automatic packages 1 between their (not shown) Endgestellen a variety of similar jobs, in this case winding units 2, up. On these winding units 2 spinning cops 9, which were preferably produced on a (not shown) ring spinning machine, rewound to large-volume cheeses 15, which are handed over after their completion by means of an automatically operating (also not shown) service unit on a machine-length cheese package transport 21.

As a rule, such automatic packages 1 also have a logistics device in the form of a package and tube transport system 3. In this bobbin and tube transport system 3 run, positioned on transport plates 8 in a vertical orientation, spinning cops 9 and empty tubes 9 'to. Next are in FIG. 1 nor the following components of the bobbin and tube transport system 3 shown: the Kopszuführstrecke 4, the reversibly driven storage section 5, one of the leading to the winding units 2 transverse transport sections 6 and the sleeve return path. 7

The supplied spinning cops 9 are rewound in the unwinding position AS, which is located in each case in the region of the transverse transport sections 6 at the winding units 2, to large-volume cheeses 15. For this purpose, the individual winding units 2 have, as is known, various devices which ensure the proper operation of these winding units 2.

These devices include a suction nozzle 12, a gripper tube 25 and a splicer 10, which is preferably formed as a pneumatic splicer. Furthermore, such a cross-winding machine 1 has a central control unit 49, which is connected for example via a machine bus 50 with the winding station computers 29 of the individual winding units 2.

The pneumatic splicer 10 is slightly set back relative to the regular yarn path and has, s. also FIG. 2 an upper thread clamping and cutting device 11, a lower thread clamping and cutting device 17, a feeder 30 and a (in Fig. 1 but not in Fig.2 shown) pivotally mounted splicer cover 23rd

The cheese 15 is freely rotatably held during the winding process in the coil frame 28 of a winding device 24 and lies with its surface on a grooved drum 14, which carries the cross-wound bobbin 15 via frictional engagement.

As already stated above, each winding unit 2 has a suction nozzle 12 which can be pressurized with negative pressure and a gripper tube 25 which can be subjected to negative pressure. The suction nozzle 12 is rotatably mounted about an axis of rotation 16, the gripper tube 25 limited about an axis of rotation 26.

The FIG. 2 shows in a perspective view of the splicer 10 Fig. 1 The splicer 10 serves to connect the coming of the cheese 15 so-called upper thread 31 with the coming of the spinning cop 9 so-called lower thread 32, which connection eg after delivery of a new spinning cop 9, a thread break or a controlled so-called cleaner cut to remove yarn defects is necessary.

In, FIG. 2 the suction nozzle 12 has just brought back the upper thread 31 from the cheese 15 and inserted into the splice 20 of the splice head 19, while the gripper tube 25 has brought the lower thread 32 from the spinning cop 9 and also inserted into the splice 20. The upper thread 31 is also threaded into the clamping element 11 'of the upper thread clamping and cutting device 11 and into the cutting element 17 "of the bottom arranged Fadenklemm- and cutting device 17. Accordingly, the lower thread 32 is in the clamping element 17' of the lower thread clamping and cutting device 17 and in the cutting element 11 "of the upper thread clamping and cutting device 11.

As in FIG. 2 indicated, the splice head 19 is connected for example via a screw 27 to a base body 22 having a plurality of pneumatic connections and in the pneumatically acted upon among other holding and Auflöseröhrchen 18 are admitted. Furthermore, the feeder 30 of the splicer 10 is also shown again. This is limited rotatably mounted about a pivot shaft 40 and is by a separate drive 42, for example, a stepper motor defined in the direction of rotation 40 'and back again movable. The drive 42 is controllable via a control line 50 'from the winding station computer 29. It is also conceivable that the drive 42 has a sensor, for example an angle measuring sensor, which signals the position of the drive 42 to the winding station computer 29. This is not shown here. alternative to the winding station computer 29, the control can also be done by the central control unit 49.

Finally, in FIG. 2 a capacitive sensor, ie a plate capacitor with the plates 35 and 35 'on both sides of the holding and Auflöseröhrchens 18 located in the figure below. This sensor is used to detect the upper thread 31 in the region of the holding and Auflöseröhrchens below 18. As long as the thread end of the upper thread 31, which in FIG. 2 is still in the suction opening of the suction nozzle 12, not yet in the measuring range of the plate capacitor 35, 35 'comes, ie as long as the upper thread 31 still extends completely in the measuring range, the plate capacitor 35, 35' no change in capacitance. Then pulls the lying in the figure above arm of the feeder 30, which acts in this embodiment as a yarn retractor for the upper thread 31, the upper thread 31 back until the yarn end of the upper thread 31 enters the measuring range, then the capacitance of the plate capacitor 35 changes , 35 '.

About a in the drawing to the plate 35 'connected measuring line 50 "learns the winding unit computer 29 of this capacity change, whereupon the winding station 29 stops the movement of the feeder 30 by the control line 50' whose drive 42 stops.

In this embodiment, since both the upper and lower arms of the shuttle 30 are fixedly connected to the pivot shaft 40, they move in synchronization with each other. That is, in this embodiment, it is assumed that the Fadenendauflösungsvorgänge, and also the subsequent retraction of the thread ends into the splice channel 20, for upper thread 31 and lower thread 32 synchronously. Therefore, a single sensor 35, 35 'is sufficient here for determining the position of the thread ends relative to the holding and Auflöseröhrchen 18, which is mounted here just as a plate capacitor laterally from the lower holding and Auflöseröhrchen 18.

Alternatively, it is of course also possible to separate the two arms of the feeder 30 from each other, ie to use separate feeder 30 for the upper thread 31 and lower thread 32. Correspondingly, separate drives 42 and control lines 50 'would then also have to be used, and then the upper holding and dissolving tube 18 should also be used with its own sensor 35, 35' for determining the position of the thread end of the lower thread 32 relative to the upper holding and Auflöseröhrchen 18 and associated measuring line 50 "to the sensor 35, 35 'are provided.

As already stated, an optical can also be used instead of a capacitive sensor, e.g. instead of the plates 35, 35 'of the plate capacitor LED and photodiode of a light barrier. And, instead of the position of the sensor elements 35, 35 'on either side of the holding and dissolving tube 18, positions in front of and within the holding and dissolution tube 18 are also practical. In this case, however, care must be taken at the position within the holding and Auflöseröhrchens 18 that this sensor element does not hinder the dissolution process of the thread end.

Furthermore, the changes in the sensor signal, when the thread end comes into the catchment area of the holding and Auflöseröhrchens 18 and is finally sucked, of course, on the sensor type and position depending, as well as the Gamparametern. Therefore, some calibration of the sensor signals is e.g. useful when using a new type of thread, but this can also be done by a trial-and-error procedure in a test splice series. For example, the threshold values for the sensor signal change can be changed on a trial basis in which the winding station computer 29 stops the drive 42 and thus the feeder 30 until splices of satisfactory quality are produced in a test splice series.

The FIGS. 3a-3f make a schematic section through the splicer 10 of FIG. 2 They show, essentially in a sectional plane extending through the lower thread 32 and perpendicular to the base body 22. They show in a temporal sequence, the movement of the two, again synchronously coupled here, arms of the feeder 30 and thereby caused by the suction flow movement of the Lower thread 32, which illustrates the dynamics of the thread movement during Fadenendeauflösung. For clarity, the other components and in particular the representation of the upper thread 31 are omitted.

It should be noted that the movement of the thread in practice will not run in a plane, since the thread is deflected several times in practice. So is already in FIG. 2 recognizable that the lower and upper holding and Auflöseröhrchen 18 are laterally offset from each other and the splice channel 20 extends obliquely between them. Thus, upper thread 31 and lower thread 32 also run obliquely in splice channel 20, while they are more vertical below and above splice channel 20. In practice, the threads are additionally deflected to other components, and therefore their movement does not run in a single plane.

The principle of the thread movement, namely the looping in the thread through the feeder 30, which causes the withdrawal of the thread end, remains unaffected. Therefore, for ease of understanding and representability, the thread movement in the FIGS. 3a-3f only schematically shown in one plane.

FIG. 3a initially represents the state in which the lower thread 32 is fixed in its lower part by the clamping element 17 'of the lower thread clamping and cutting device 17, and in its upper part in the cutting element 11 "of the upper thread clamping and cutting device 11 its middle part of the lower thread 32 is located in the splice 20 of the splice head 19 attached to the base body 22 and above it in the catchment area of the upper holding and Auflöseröhrchens 18. The two arms of the feeder 30 are spaced from the thread and affect his way not yet.

FIG. 3b then represents the state after cutting the lower thread 32 in its upper portion by the cutting element 11 "of the upper thread clamping and cutting device 11 and the first engagement of the lower arm of the feeder 30 in the yarn path. At the latest immediately after cutting to a suction flow is applied to the upper holding and dissolution tube 18 to hold the upper part of the lower thread 32 in the draw-in area of the upper holding and dissolving tube 18. The part of the lower thread 32 lying in this draw-in area slightly curves under the suction flow the interior of the upper holding and dissolution tube 18, see reference numeral 33. However, the stiffness of the lower thread 32 prevents suction into the upper holding and dissolution tube 18.

The lower arm of the feeder 30 has already intervened by rotation of the feeder 30 about its pivot shaft 40 in the direction of rotation 40 'in the yarn path of the lower thread 32 and the loop 34 formed. This looping causes the withdrawal of the thread end 32 'of the lower thread 32 in the direction of the upper holding and Auflöseröhrchens 18, ie down in the plane.

The upper arm of the feeder 30 may have previously touched the upper part of the lower thread 32, but this guiding effect does not matter for the threadline, and at the latest, after the thread end 32 'of the lower thread 32 is below the upper arm of the feeder 30, there no contact of this arm with the lower thread 32 more. However, the upper arm of the feeder 30 of course assumes the same function for the upper thread 31 as that of the lower arm of the feeder 30 for the lower thread 32, that is, the operations for the upper thread 31 not shown here are analogous to those for the lower thread 32 Operations.

In Figure 3c the lower arm of the feeder 30 was further pivoted by rotation of the feeder 30 about its pivot shaft 40 in the direction of rotation 40 'until the lower thread 32 was pulled back by increasing the loop formation 34 so that its thread end 32' in the upper mouth region of the upper holding and dissolution tube 18. that is, Figure 3c illustrates the situation just before sucking the thread end 32 'inside the upper holding and Auflöseröhrchens 18. The termination of the feeder movement at this point, as discussed in detail above, on the one hand, should the drive 42 is designed as a stepping motor, via a From the geometric ratios calculated number of steps of this motor be controlled by the winding station computer 29. Alternatively, however, a sensor 35, 35 'for the active detection of when the thread end 32' reaches the upper mouth area of the upper holding and Auflöseröhrchens 18 are provided, which then informs the winding station computer 29 accordingly.

Since the thread end 32 'of the lower thread 32 is now in the upper mouth region of the upper holding and Auflöseröhrchens 18, the stiffness of the lower thread 32 is now no longer an obstacle to the suction of the thread end 32' in the interior of the upper holding and Auflöseröhrchens 18 , ie, since now the previously in FIG. 3b Still present and due to the thread stiffness not resolvable loop 33 no longer exists, the lower thread 32 can now be sucked in with its thread end 32 'in the upper holding and Auflöseröhrchen 18.

3d figure shows then the subsequent state in which the feeder 30 is pivoted back a piece about its pivot shaft 40 counter to the direction of rotation 40 'and the in the loop 34 has formed thread reserve again partially dissolved. In parallel, the thread end 32 'under the action of the suction flow before and in the thread-facing end of the upper holding and Auflöserohrchens 18 further into the interior of the upper holding and Auflöseröhrchens 18 has moved.

In this case, the winding station computer 29 controls this return movement until a desired thread length for the dissolution of the thread end 32 'is within the range of action of the currently switched-on dissolution stream inside the upper holding and dissolving tube 18. That is, with this return movement, the length over which the yarn end 32 'is dissolved can be accurately adjusted. Again, the scope of the return movement can be effected via a calculated from the geometric ratios back-step number of realized as a stepper motor drive 42. Alternatively, however, an active control via a sensor signal is also conceivable here, for which purpose, however, a corresponding sensor should additionally be mounted inside the upper holding and dissolving tube 18 and connected to the winding station computer 29.

As previously explained, in practice, the suction and dissolution flow is achieved before and in the holding and Auflöseröhrchen 18 by a uniform application of one or more located in the holding and Auflöseröhrchen 18 nozzles with compressed air. This results in the nozzle area and in the direction of the yarn-free exit of the holding and Auflöseröhrchens 18 facing in this direction and tangentially applied to the inner surface of the holding and Auflöseröhrchens 18 and acting as a dissolution flow rotational flow, which is in front of the nozzles in the direction of the yarn-oriented output Holding and Auflöseröhrchens 18 as suction flow pronounced. In principle, however, it is also open to the person skilled in the art to choose here other nozzle shapes and a plurality of mutually independent impingements with pressure or suction air. Further, in practice, as the flow medium, i. as "pressure or suction air", on the one hand actually preferably simple air are used, other media such. However, air enriched with water droplets should not be excluded.

FIG. 3e Next, the situation immediately after completion of the yarn end resolution. That is, it is after the situation of 3d figure no further thread movement takes place, but only the dissolution flow in the upper holding and Auflöseröhrchen 18 has done its job and the thread end 32 'over the thread length 32 "dissolved.

FIG. 3f Finally, the situation after showing the in FIG. 3e shown Fadenendeauflösung the feeder 30 again a piece about its pivot shaft 40 in the direction of rotation 40 'is vorschwenkt and its lower arm, the loop 34 has increased again. As a result, the thread end 32 'is slid out of the upper holding and Auflöseröhrchen 18 and is now completely with the dissolved thread length 32 "in the splice 20 of the splice head 19th

Again, the movement was controlled by the winding station computer 29, e.g. by selecting the number of steps of the drive 42 designed as a stepper motor on the basis of the geometric conditions, or again on the basis of a sensor signal, what then the attachment of a further sensor for monitoring the arrival of the thread end 32 'would be provided in the splice 20.

Further processing, i. First, the actual splicing of upper thread 31 and lower thread 32 and the subsequent operations are carried out in a known manner.

Although the yarn end release according to the invention has been described above in connection with a splicer for a cheese winder, it will be apparent to those skilled in the art that other uses such as e.g. may be advantageous in connection with open-end spinning machines. Because even with such textile machines, it is known to be common practice to carefully prepare the suture ends prior to re-spinning in appropriate dissolution tubes.

Further, for the sake of completeness, it should be pointed out that the indefinite article does not exclude that components designated by it can not also be present multiple times. Likewise, the description of a particular component does not necessarily mean that its functions could not be distributed among several alternative components, or that the functions of several described components could not be grouped together.

Claims (10)

A thread end resolution method for a splicer comprising the steps of: (i) cutting the filament through a cutting device of the splicer, the filament being in the draw-in area of a holding and disintegrating tube of the splicer, (ii) at the latest after cutting the thread, applying a suction flow to the holding and dissolving tube, (iii) sucking the thread end through the suction flow fitting the holding and dissolving tube into the holding and dissolving tube, (iv) dissolution of the thread end by means of a dissolving flow applied at the latest in the holding and dissolving tube,
characterized,
that the following step is inserted between steps (ii) and (iii): (ii.A) Transport of the thread end in the catchment area of the holding and Auflöseröhrchens by interaction of suction flow and a yarn retractor. A method according to claim 1, characterized in that the yarn retraction device in step (ii.A) positioned the yarn end in the catchment area of the holding and Auflöseröhrchens that the voltage applied to the holding and Auflöseröhrchen suction flow the yarn with the yarn end leading into the holding and Auflöseröhrchen sucks. A method according to claim 1 or 2, characterized in that between steps (iii) and (iv) the following step is inserted: (iii.A) Enlargement of the length of the thread sucked into the holding and dissolution tube by interaction of suction flow and thread withdrawal device. A method according to claim 1 or 2, characterized in that the yarn retracting device is also used for the Fadenendeauflösung subsequent operations of the splicer, in particular for a successful immediately before splicing positioning of the thread end in splice of the splicer. A method according to claim 1 or 2, characterized in that the yarn retracting device is used exclusively for the yarn end resolution serving steps of the splicer. A method according to claim 1 or 2, characterized in that the method for the Fadenendeauflösung of to be spliced upper and lower threads is used. A method according to claim 1 or 2, characterized in that the yarn retracting device is controlled by a control device which knows the geometric conditions in the splicer including the relative position of the cutting device for holding and Auflöseröhrchen and controls the yarn retractor in calculated on the basis of this geometry working positions. A method according to claim 1 or 2, characterized in that the yarn retraction device is controlled by a control device which receives a sensor signal on the position of the thread end in the catchment area of the holding and Auflöseröhrchens and controls the yarn retraction device in response to the sensor signal. Device for yarn end resolution for a splicer, the device comprising the following components simultaneously belonging to the splicer, namely a cutting device, a holding and Auflöseröhrchen and a yarn retracting device, and wherein the device comprises at least one control device,
characterized,
in that the components belonging to the splicer are structurally arranged in relation to one another and the control device is set up in such a way that the device, in its operation, carries out a method according to claim 1 for the thread end resolution for the splicer. Computer program for a device according to claim 9 for yarn end resolution for a splicer, wherein the control device of the device is program-controlled,
characterized,
in that , when the computer program is running on the control device, the device performs in its operation a method of claim 1 for thread splitting resolution for the splicer.

Images