EP0241850B1 - Device for drawing off a thread - Google Patents

Description

The invention relates to a thread take-off device for pulling a continuously running thread with a suction device which removes the thread in an air stream. In addition, the invention relates to methods for applying a freshly spun chemical thread coming from the spinneret to rapidly rotating machine parts.

The invention solves the problem of designing the so-called suction guns or other suction devices in such a way that they can apply sufficiently high thread tensile forces even at high thread speeds of more than 4,000 m / min.

Suction guns or other suction devices serve the purpose of pulling off continuously occurring threads, in particular man-made fibers during the business interruption, for example during the bobbin change in a man-made fiber spinning machine, and feeding them to the waste. The thread is subjected to a strong air flow in these suction pistols. However, the limit of the possibility of using such devices is at thread speeds of approx. 4000 m / min (65 to 70 m / s). It becomes particularly impossible to apply the necessary thread tensions when the thread is to be placed on godets or winding machines and / or is conveyed by means of godets. There is a risk that the thread will form a winder on the godet / winding machine due to insufficient thread tension. At these thread speeds, the compressors or are required because of the very high power requirement Vacuum pumps represent a significant cost factor, although these machines are only needed for short periods in the event of business interruptions.

Finally, the efficiency of such suction pistols and air injectors is so low that economical use is no longer possible at high thread speeds.

In order to be able to exceed the limit of approx. 4000 m / min with thread suction devices and to be able to generate sufficient thread tensile forces, it was proposed to generate the suction flow through a liquid, in particular through water, wherein pressures of approx. 80 bar and more were mentioned. However, this procedure was unsuccessful. On the one hand, the need to remove the water quantities without excessive effort was a difficult task. In addition, there were flow-related obstacles, since even for the free flow of a friction-free liquid, a pressure of 51 bar is required to achieve a flow rate of 6000 m / min (100 m / s). Finally, the thread must first be taken over by an air suction flow and then by the liquid flow, which is only incomplete.

According to the invention, the threading device is arranged directly upstream of the suction device. This thread feed mechanism consists of at least one driven roller to be looped by the thread. The suction mouth is arranged in the immediate vicinity of the surface of the roll in the thread path behind the roll and preferably on an outlet tangent thereof.

The invention further provides measures by which it is ensured that the thread does not form any winders on the thread feed mechanism. In one embodiment, this two rollers arranged at a short distance from one another and rotating in the same direction are provided, at least one of which can be driven and the roller axes of which are interleaved or form an acute angle with one another. The thread is guided over this feed mechanism in such a way that it runs onto the rollers in the area of the wide center distance and that the suction device is arranged in the area of the small roller distance. In this embodiment, the suction device can connect to the lower works substantially in the axial direction or encompass the end of the supply works, whereby a thread guide must be present which prevents the thread from unwinding again overhead from the supply works. Alternatively, the suction device can be arranged transversely to the roll axes, so that the thread is drawn off tangentially from the rolls.

Alternatively, the formation of the winder is avoided in that the thread feed mechanism is formed from only one roll, which is of conical design. In this embodiment, the roll is cantilevered at its thick end, so that any curlers that may form always slide off towards the thin end and can be removed there. On the other hand, due to the taper, a constant, axial feed is effected, so that _ as with the delivery unit with two rollers, the axes of which are interlaced with one another, _ several turns are not superimposed.

The thread take-off device according to this invention can be mounted as a stationary unit, in which case mechanical or pneumatic means for applying the thread to the thread feed mechanism must be provided at the same time. Above all, however, the thread take-off device can be designed as a portable handling device, comparable to the previous suction pistols.

According to the invention, several devices and procedures tailored to them are available for applying the thread to the thread feed mechanism of the thread take-off device.

If the roll or rolls of the yarn feeder are stored on the fly and the suction device is arranged at the area of the bearing end, the following method is proposed, in particular in chemical fiber spinning systems: the thread which is produced by the spinneret at a relatively low speed is first caught by the suction device, so that the thread is drawn off with the tensile force that can be generated by the suction device alone. Now the handling device is pivoted in such a way that the roller axis or roller axes traverse the thread path once or several times in a wobbling movement. As a result, the thread forms one or more loops on the roll or rolls. The handling device must be held in this way at the end of this process, or the thread must be inserted in a thread guide located on the handling device at the end of this process. be that it tapers to the roles or the role substantially tangentially. In this way it is avoided that the point of run-up of the thread migrates to the feed mechanism in the axial direction. The thread pulling device can now exert such a high thread tension on the thread that the thread can be applied to high-speed machine parts such as godets and / or winding devices without the risk of winder formation.

Mechanical options for threading are also available. Here too, the procedure is such that the thread is first caught by the suction device. Then the mechanical application device is put into operation. This method is also particularly suitable in spinning systems for catching the thread coming from the nozzle. After threading the thread to the Thread take-off device, the thread with high thread tension can also be applied to high-speed machine parts such as godets and / or winding devices.

When the thread is applied to the thread feed mechanism, it is drawn off with greater tensile force, the tensile force corresponding on the one hand to the torque of the drive motor and on the other hand to the number of wraps. The torque characteristics of the motor on the one hand and the number of wraps must be coordinated so that there is no thread breakage. The suction device is now only used for the purpose of applying a low tensile force in the thread end running off. This tensile force in the running thread end only has to be so great that a sufficient tensile force in the incoming thread end is induced by wrap friction. On the other hand, only a low tensile force of the running thread end can be compensated for by additional looping.
An additional possibility for setting and / or regulating the thread tension is given in that the point at which the thread runs up is axially adjustable and in that the thread feed mechanism consists of a conical roller.

Mechanical devices for thread application can be designed such that the thread pulling device is pivoted about the thread axis after the thread has been caught in the suction device.

However, the invention proposes a mechanically simple and safe-acting application device. This consists of a thread guide that bypasses the thread feed mechanism on an envelope and thereby traverses the thread path in the area of the suction device. The thread guide preferably also gives the thread an axial feed. Above all, it can be a flyer-like thread guide that is coaxial or parallel to the roll axis or _ in a yarn feed unit that consists of two rollers _ is pivotally mounted in a plane between the roller axes. The axial feed can be effected in that the flyer is mounted in a thread or in that the thread guide located on its outer arm is of helical design.

Alternatively, the invention provides pneumatic threading means which cooperate with the suction device. In one embodiment, whoever invention that allows high thread speeds with high catch safety and that is also very simple and compact to integrate into a handling device, the air flow conveying the thread is guided tangentially on and in a vortex, a roller and then subtracted tangentially. The roller is constantly driven with the direction of rotation of the vortex. With a conical roller, the air flow hits the roller circumference in a normal plane in the area of the thicker end (thread inlet plane). In this thread infeed plane, the peripheral speed is at least equal to the thread speed. The air vortex then continues towards the thinner end of the conical roller.

In an effective embodiment, the roller for generating the air vortex is surrounded by a flow channel which forms a narrow gap with the roller and is so wide open to the roller that the thread can leave the flow channel. The flow channel can be a helically curved, slotted tube. For the avoidance of winders, it is even more favorable _ for reasons that are explained below _ if the roller is surrounded by a housing. The inner shell of this housing forms a narrow gap with the roller. The gap width is dimensioned so that the thread on the roller can also form a small winder. In the inner casing is a helical flow channel Cut groove that extends around the roller with at least half a turn. Thread inlet channel and thread outlet channel, which penetrate the housing, open in front of and behind this groove, respectively. The channels are preferably aligned with the groove ends. The roller can in turn be conical in order to achieve an axial advance of the thread turns. The interior of the housing can also be conical.

Conical rollers also have the advantage that the thread tension is automatically set on them. When a certain tensile force is exceeded, the thread turns slip to the area of the thin end and thus to an area of lower peripheral speed. As described, this effect can also be achieved deliberately by adjusting the thread's point of contact.

Another possibility for generating an air vortex is that the roller is mounted in a housing which is adapted to the circumference of the roller with a gap. The thread inlet channel and the thread discharge channel open into this housing, both channels lying on a tangent to the roller. Otherwise, the inner wall of the housing is smooth. The direction of rotation is chosen so that the roll circumference and the air are aligned. As a result of the rotation of the roller, in this embodiment the air flow generated by the suction device is first deflected to an air vortex on the roller, the so-called Coanda effect also playing a role. The thread is thus first drawn around the roller in an air vortex before it is caught by the suction device. It has surprisingly been found that surprisingly good catch safety can also be achieved with this embodiment.

If the roller is conical in this embodiment, multiple wrapping of the roller can also be effected by axially displacing the thread suction channel with respect to the thread feed channel to the thin end. Slipping of the thread turns ensures that the free thread end caught by the roller reaches the area of the thread suction channel and is drawn off there.

A further possibility of the pneumatic application of the thread to the thread delivery unit is provided if the roller of the delivery unit is conical and is overhung. Here, the thread suction channel is arranged on a tangent of the roll in the region of the free end without the mouth of the thread suction channel preventing the thread wound on the winding body from slipping off to the free end of the winding body. The mouth of the thread suction channel is designed so that it engages around the free end of the conical roller in a plate or pot-like manner. In this version, the thread is first brought into circumferential contact with the conical roller. It then forms a winder on the conical roller, which slides towards the free, thinner end. The slipping windings fall into the plate or pot-shaped mouth of the thread suction channel. From there they are drawn off by the suction device until the thread is drawn smoothly and runs tangentially from the conical roll.

The invention is based on the knowledge that it is unproblematic to catch a delivered thread end by means of a suction gun or an air flow, especially if the thread comes fresh from the spinneret. According to the knowledge of the invention, the tensile force that is required in order to avoid winder formation at the delivery unit following the spinneret is only possible with mechanical support of the air flow through a delivery unit. On the other hand, offers the invention by using the conical roller the advantage that a winder formation at the delivery plant is impossible. Possible winders slip on the conical roller and are always carried along by the air flow escaping through the thread outlet pipe.

To remove the winder, it is further provided that the conical roller is overhung and that the housing is open towards the free end. This ensures that any winders slide over the free end of the roller and can fall out of the housing or be pulled out. It is also possible to connect the open end of the housing to another suction channel, which then opens into the waste.

In this application, all rollers are referred to as conical rollers which have a continuously decreasing diameter from the thread run-up level to at least the normal plane in which the thread suction channel lies (thread run-off level). In addition to truncated cones, paraboloids, hyperboloid stumps and the like are also considered.

High-speed electric motors can be used to drive the yarn feed mechanism. Air turbines are also advantageously used. When the thread is pneumatically applied to the supplying unit, a sequence control can be used, by means of which initially only the air turbine with the thread supplying unit is put into operation. Only when the yarn feeder has reached its target speed is the suction device also pressurized with compressed air. The thread feed unit can continue to run idle or with a reduced air requirement so that the necessary suction energy is available. After switching on the suction device, the thread is sucked in, applied to the thread feed mechanism and sucked off. Now the air turbine is again charged with the larger part of the available air volume, so that by the The desired tractive force can be applied. On the other hand, only a lower amount of energy is required to suck the thread from the delivery mechanism. With this sequential circuit, the thread is prevented from coming into circumferential contact with the thread feed mechanism before it has reached its desired speed. This increases the security of the application and reduces the risk of windings.

Exemplary embodiments of the invention are described below with reference to the drawing.

Fig. 1

ein Fadenabzuggerät mit einem Fadenlieferwerk, das aus zwei Rollen besteht;

Fig. 2"

mit einer Vorrichtung zum Anlegen des Fadens; 3"

Fig. 4

Fadenabzuggerät mit einer Vorrichtung zum Anlegen des Fadens;

Fig. 5,

Fadenabzuggerät mit pneumatischem Anlegen des 6, 7 Fadens;

Fig. 8,

Fadenabzuggerät mit pneumatischem Anlegen des 9 Fadens.

Show it

Fig. 1

a thread take-off device with a thread feed mechanism which consists of two rollers;

Fig. 2 "

with a device for applying the thread; 3 "

Fig. 4

Thread take-off device with a device for applying the thread;

Fig. 5,

Thread take-off device with pneumatic application of the 6, 7 thread;

Fig. 8,

Thread take-off device with pneumatic feeding of the 9 thread.

1 consists of the suction device 24 and the thread feeder 1. The suction device consists of the suction pipe 16 and an injector attachment with an annular channel 23, which is connected via air supply 22 to a compressed air source. Blow ducts 21 lead from the ring duct 23 into the thread outlet duct 31, where the compressed air flowing out generates a strong suction flow in the direction of the arrow.

Before the inlet of the suction pipe 16, the yarn feed mechanism 1 is arranged transversely to the air duct axis 28. The bracket 40 is connected by connection 41 to the wall of the suction pipe 16. Two rollers 32, 33 are mounted in the holder 40 in such a way that that the roller axes 45, 46 extend at an acute angle 34 to one another. It is particularly advantageous for the delivery mechanism 1 to be arranged in front of the intake pipe 16 in such a way that the air duct axis 48 extends essentially in a plane tangent to the two rollers 32, 33. In addition, the air duct axis 48 strikes the yarn feed mechanism 1 in its end or outlet area 47, while a substantial part of the longitudinal extent of the feed mechanism 1 projects laterally beyond the suction pipe 16. It is therefore provided that the thread runs in the area of the smaller center distance from the delivery mechanism 1.

The thread outlet 31 is connected to a flexible tube which leads into a waste container. The thread take-off device forms a handling unit which has a handle, not shown. In particular, the suction pipe 16 and / or the thread outlet channel 31 can serve as a handle.

The roller 32 is driven by a high-speed electric motor in the drive housing 8. The drive housing 8 is fastened on the holder 40. The roller 33 is freely rotatable in the holder 40.

To thread the thread, the thread coming, for example, from the spinneret 57 is first drawn straight into the suction tube 16 of the suction device 24 in operation: thread run 20.1, shown in broken lines. It should be taken into account that the thread is not delivered by the spinneret 57 at a defined speed. Therefore, the suction forces exerted by the suction device 24 are sufficient to pull off the thread and to prevent it from becoming entangled and knotted. In the meantime, the roller 32 has also been set in rotation, the rotational speed of the roller being so high that its peripheral speed essentially corresponds to the nominal speed of the thread and the peripheral speed of the feed mechanism 30, to which that of the spinneret coming thread to be created corresponds. Before the thread is applied to the lowering unit, the thread pulling device is pivoted several times so that the supply unit 1 executes a wobbling movement around the thread axis, so that the thread which has just been running is looped once or several times around the two rollers 32, 33 of the supply unit With increasing wrap, the delivery mechanism and in particular the driven roller 32 exerts an increasing frictional force on the thread, so that the thread is now drawn off with essentially its desired speed and high tensile force. The thread take-off device is now guided several times around the godet 30 and the thread is thereby placed on the godet 30 with the desired number of wraps (thread path 20.2). Likewise, the thread can now be placed with the thread take-off device on a winding device 49, which is only indicated schematically (thread run 20.3).

In the embodiment according to FIG. 2, the delivery unit 1 and the suction device 24 are essentially coaxial or parallel, the outlet end 47 of the delivery unit 1 pointing to the inlet of the expanded suction channel 16. It is shown that the outlet end 47 of the delivery unit 1 projects into the enlarged inlet of the suction channel 16. However, it is also possible and advantageous, as is shown in FIG. 3, that the suction channel 16 opens parallel over the plane in which the two roller axes 45, 46 lie. In the embodiment shown, the holder 40, in which the rollers 32, 33 are mounted, is connected to the wall of the suction pipe 16 by connection 41. In the embodiment shown in FIG. 2, too, the two roller axes 45, 46 of the delivery mechanism 1 run at an acute angle to one another. A cap 43 with counter bearing supports the two rollers on its free end and covers the run-up ends of the two rollers so that its edge largely prevents the thread from slipping off the rollers 32, 33.

The suction pipe 16 is in turn connected to a suction device 24, which consists of an annular duct 23 with a compressed air connection 22 and the blowing ducts 21 and generate a strong suction flow in the suction pipe 16. The thread is discharged into the waste through thread outlet channel 31.

To apply the thread to the godet 30, the thread coming from the spinneret is first caught in the suction tube 16 by the suction device 24 and drawn off straight in the thread path 20.1. Now the thread take-off device is pivoted several times in such a way that the air duct axis 48 and the delivery mechanism execute a wobbling movement around this thread run 20.1, so that a desired number of turns are formed on the delivery mechanism 1. Previously, the rollers 32 and 33 of the delivery mechanism were put into operation by an air turbine located in the holder 40. Therefore, the thread is now withdrawn from the spinneret at the speed and tensile force specified by the air turbine. The connection 41 serves at the same time as a thread guide, which prevents the thread from being pulled off the delivery mechanism by the delivery mechanism due to the suction force exerted by the suction device.

Now the thread can be applied to the godet 30 in the thread run 20.2.

Apart from the fact that the thread running from the delivery mechanism 1 is taken over tangentially in FIG. 1 and axially in FIG. 2 by the suction device 24, the interaction of the delivery mechanism 1 and the suction device 24 is essentially identical. The thread 20 to be drawn is in each case wrapped in a plurality of turns 36 around the two rollers 32, 33 of the thread feed unit 1 in operation and is drawn off with increased tensile force as a result of the frictional contact between the rollers 32, 33 and the thread which results. The arrangement of the two rollers 32, 33 at an angle 34 causes each other that the individual thread turns 36 are axially offset from each other. In the area of the outlet end 47 of the thread feeder 1, the thread is taken over and removed by the suction flow of the suction tube 16.

1 and 2, the two rollers 32, 33 with their axes 45, 46 form an acute angle 34 to one another. Instead, the arrangement can also be such that the axes 45 and 46 lie in two substantially parallel planes and thus to one another aligned that they intersect in the projection in one of the two planes at an acute angle.

At least one of the two rollers 32, 33 is driven at such a high speed that the peripheral speed corresponds at least to the thread speed. This can e.g. in that an air turbine is arranged in the holder 40, as described, but the drive by an electric motor is also possible.

With the device according to the invention, a thread can be applied to godets and other thread conveyors, in particular also to a winding device, at peripheral speeds which are well over 4,000 e.g. 7,000 m / min. This is obviously due to the fact that the necessary thread tension is generated by the thread feed mechanism 1 and can be set so high that no winder forms on the godet or the winding device. High flow velocities are then required to remove the thread running from the feed mechanism 1, but only relatively low tensile forces are required.

FIGS. 3A, 3B, 3C serve to explain a thread take-off device with an application device for the thread. The rollers 32 and 33 of the thread feed mechanism 1 are rotatably mounted on the holder 40. Roller 33 is driven by a turbine, whose housing is designated 8, driven. The roller axes of rollers 32 and 33 intersect at an acute angle. Heath rollers are mounted in the holder 40 in such a way that their center distance decreases from their free end to their bearing end 47. The drive direction of the roller 33 is indicated by arrow 35. The suction device lying in the holding device 40, the suction tube 16 of which lies between the two rollers 32 and 33 and above the plane connecting the roller axes, is accommodated in the holder 40. The suction device consists, as has already been described for the embodiment of FIGS. 1 and 2, of an annular channel, which surrounds the suction channel 16 and is connected to it by blowing channels. The ring channel is supplied with compressed air through a compressed air connection 22. The compressed air connection 22 penetrates a handle 39 at the same time. The channel guide inside the holder 40 is not shown in detail.

The thread application device is a U-shaped bracket 50. The bracket 50 is pivotally mounted at one end in the holder 40. The end is arranged essentially parallel to the bisector between the two roller axes. Furthermore, the pivot bearing in the holder 40 and the bearing end of the bracket 50 has a high helix thread 51, the function of which will be described later. A thread guide 52 is mounted on the other U flank. This thread guide 52 is a so-called "wolf tooth", i.e. the thread guide 52 has a catch slot into which the thread can enter laterally but not out again.

The thread guide 52 is pivotable about axis 53, but the thread guide is not axially movable.

The bracket 50 can be pivoted in the direction of the arrow 54, ie in the direction of rotation of the yarn feed mechanism.

The suction device ends in a thread outlet channel 31 to which a waste bag 44 is clamped. The steep thread 51 is designed so that when the bracket 50 is pivoted in the direction of arrow 54, the bracket executes an axial movement in the direction of arrow 55.

The thread pulling device is handled as follows for thread catching and for threading the thread on a godet; First, the thread coming from a spinneret, not shown, is brought into the area of the mouth of the suction tube 16 and drawn off. This is possible because the thread is not delivered by the spinneret at a defined and particularly high speed. In the meantime, the air turbine in the housing 8 has also been pressurized with compressed air and consequently the roller 33 is set in rotation, so that the roller is driven essentially at the desired peripheral speed of the godet 30 (FIG. 3C) to which the thread is to be applied. The thread has a thread run 20.1 (Fig. 3A). The bracket 50 is now rotated against the direction of the arrow 54. The thread guide 52 gets into the thread path and catches the thread with its "wolf tooth" (FIG. 3A). The bracket 50 is now rotated in the direction of the arrow 54. 3B shows, the thread guide 52 can adjust itself to the thread by pivoting about axis 53. The pivoting movement of the bracket 50 in the direction of arrow 54 winds the thread around the rollers 33 and 32. Since, during the rotational movement in the direction 54, the bracket 50 simultaneously executes an axial movement in the direction of the arrow 55 as a result of the pitch of the steep thread 51, as shown in FIG. 3C, several axially offset thread turns 36 are wound around the rollers 32, 33. The now maintained thread path 20.3 is characterized in that the incoming thread is first passed through the thread guide 52, redirected by this thread guide 52 to the roller 33, then guided in two essentially complete loops around the rollers 32 and 33 and then in the area of the End 47 of the roller is sucked off the roller 33 in the suction opening 16 and guided into the waste bag 44. The thread can now be placed against the godet 30 rotating at high peripheral speed (FIG. 3C) and possibly also a subsequent winding device.

Characterized in that the axes of the rollers 32, 33 intersect at an acute angle, the thread vibrations 36 are placed axially next to each other so that there is no winder formation.

4 has only a rotatably driven, cylindrical roller 33 on a holder 40 as the thread feed mechanism. The suction pipe 16 of the suction device, not shown in the rest, opens in the region of the outlet end 47 of the roller 33, the roller 33 is driven with the direction of rotation 35. An air turbine can be used for the drive, which, like the suction device, is fed with compressed air through compressed air connection 22. The suction device is constructed, for example, as described in connection with the exemplary embodiments according to FIGS. 1 to 3.

The application device in turn consists of a U-shaped bracket 50. One U flank is coaxially mounted in a pivotable direction 54, but independently of the roller 33. The other free U flank has a thread-shaped thread guide 56 at its end. To catch the thread, the thread is first caught by the mouth of the suction device 16 and drawn off with a thread run 20.1 (dashed line). Now the bracket is pivoted into position 50.1, in which the threaded wire 56 engages behind the thread in the thread path 20.1 with its outermost end. The bracket 50 is now rotated further with the pivoting direction 54. The pitch of the threaded wire 56 is selected so that the thread rises in the threads with the direction of arrow 55. This will the thread _ in the illustrated case _ wrapped in about 3 turns around the roller 33 and otherwise held by the threaded wire 56 as a thread guide in the thread path 20.3. It should be noted that only a few loops are possible on the cylindrical roller 33, otherwise there is a risk of winder formation. However, it is also possible to make the roller 33 conical with this application device. It should also be mentioned that, in the latter case, the U-leg, about which the bracket 50 can be pivoted, can also lie axially parallel to the roller 33 instead of coaxially.

For the rest of the application procedure, reference is made to the description of the preceding exemplary embodiments.

The embodiment of FIGS. 5 to 7 is characterized by pneumatic means for threading. The conical roller 33 of the yarn feeder 1 is firmly connected to the shaft 2 and the turbine wheel 3. The shaft 2 is rotatably supported between the conical roller 33 and the turbine wheel 3 by bearings 4 in the housing 5. The housing 5 consists of a trigger housing 6, a bearing housing 7 and a drive housing 8. A conical bore 9 is made in the trigger housing 6 and ends in a cylindrical bore 10. The conical bore surrounds the conical roller 33 with a narrow gap 11. The gap 11 is e.g. 1 mm wide. In the inner shell of the conical bore, a groove 12 is cut, which is helical. The inlet end 13 of the groove 12 is aligned with the thread inlet channel 14. The outlet end 15 of the groove 12 is aligned with the thread suction channel 16.

The thread inlet channel 14 can be filled with injector nozzles 17, which are fed via the air connection 18 and the ring channel 19. The injector 17, 18, 19 generates a negative pressure in the entrance of the thread inlet channel 14, so that a supplied thread end 20 is sucked in here.

In particular, however, a suction device 24 is arranged behind the roller 1. For this purpose, the thread suction channel 16 is filled with the injector nozzles 21, which also point in the thread running direction and which are fed through the air inlet tube 22 and the ring channel 23. The injector 21, 22, 23 generates or supports the suction air flow in the channel strip, which consists of thread inlet channel 14, groove 12 and thread suction channel 16.

The turbine wheel 3 is fixedly attached to the shaft end 2, which faces away from the conical roller 1. The turbine wheel 3 consists of the two end disks 25, between which the turbine blades 26 (section according to FIG. 7) are fastened, e.g. by welding. One end disk 25 of the turbine wheel 3 is firmly seated on the shaft 2. The turbine housing 8 forms an annular channel 80 with and around the turbine wheel 3. The compressed air channel 27 opens into this annular channel. The compressed air channel 27 is directed essentially tangentially into the annular channel. Its orientation and the shape of its mouth is generally known in the construction of compressed air turbines and is not described in more detail here. The required air pressure can build up in the ring channel 80. The turbine wheel can be driven at speeds of up to 10,000 rpm.

The blades 26 of the turbine wheel 3 leave the outflow channel 28 free in the center of the turbine wheel. The outflow channel is closed on the bearing side by an end plate 25. The outflow channel 18 opens to the free end of the shaft 2 in the axial air outlet 29 of the housing, the end plate 25 also having a correspondingly large hole.

It must be noted in particular that, according to the experience available, the groove 12 in the jacket of the conical bore 9 is particularly advantageous for threading, in particular for safety in catching and the reproducibility of thread catching is. The groove creates a flow field of high energy in the cross-sectional area of the groove, the flow direction of which is well defined by the groove geometry. This ensures that the thread is conveyed from the thread inlet channel 14 and the inlet end 13 of the groove to the outlet end 15 of the groove and thus into the thread suction channel 16.

About the function:

To start up the thread take-off device, the compressed air channel 27 is pressurized with compressed air and the turbine wheel 3 with the shaft 2 and the winding body 1 is thereby rotated until the peripheral speed of the godet 30 is reached. Now the injector nozzles 17 and 21 are charged with compressed air via air connection lines 18 and in particular 22. This creates a suction flow at the entrance of the thread inlet channel 14, which continues as a vortex flow around the roller 1 and as an air flow in the outlet channel 16. The air speed is higher than the thread speed. To catch the thread supplied by a spinneret, for example, it is only necessary that the air flows at least at the thread speed. It is not necessary that large impulse forces are exerted on the thread. Rather, the thread is wound in a swirl of air around the cone roller 1 in a fraction of a second. It is inevitable that the thread comes into contact with the cone roller. Now the thread is drawn off by frictional contact with the conical roller 1. It should be noted that the peripheral speed of the conical roller 1 in the area of the thread inlet plane is at least equal to the thread speed specified by the feed mechanism 30. Preferably, the peripheral speed of the conical roller 1 is also greater in the area of the thread outlet (groove end 15) than the thread speed. Therefore, the cone exerts considerable friction on the thread. This frictional force is sufficient to pull the thread with such high thread tension subtract from the lowering unit 30 in such a way that it can be applied to the supply unit 30 without a thread winder forming on the supply unit 30.

5A shows a manual sequence control. The air supply is switched off without operation (position I). In the position II of the valve set by hand, only the air turbine is supplied with compressed air via line 27. The valve is then switched to a further operating position III. In position III, the suction device 24 is acted upon via line 22 with the essential part of the available compressed air quantity, while the turbine now receives a reduced quantity via a throttle. It is also possible to completely shut off the supply line to the turbine via the throttle. For the formation of the thread turn on the thread delivery unit, it is usually sufficient if the thread delivery unit runs in tar travel. In the further position IV, the valve is switched so that the suction device 24 is only supplied with compressed air via another throttle, while the essential part of the compressed air is supplied to the turbine.

It has already been mentioned that the groove promotes vortex formation and thread transport with an axial feed and therefore the safety of catching is increased. Contrary to expectations, however, tests have shown that good safety of catching even without this groove, i.e. is achieved with a roller with a smooth inner casing 9.

The rotation of the roller 1 contributes in particular to the formation of eddies and the thread transport with axial feed from the thread inlet to the thread outlet. The thread inlet can lie on the same normal plane as the thread outlet. Here, however, the risk of winder formation is somewhat coarser. Fin axial feed is achieved in particular by _ thread inlet channel, as is also shown in FIG. 5 and thread suction channel are axially offset from one another and that the suction device lies behind the roller, that is to say in the thread suction channel, so that a defined suction flow results from the thread inlet into the thread outlet. This reduces the risk of winders.

After trapping, the air flow in the channel strip consisting of thread inlet duct 14, groove 12 and thread suction duct 16 can be substantially reduced, since the thread conveyance now takes place essentially by frictional contact with the conical roller 1.

It is important that the cone roller has a continuously decreasing diameter towards its free end in the entire area that comes into contact with the thread. The coefficient of friction and the cone angle are coordinated so that the thread cannot be held on the surface by self-locking, but in any case slips when it is under the corresponding thread tension. For this reason, it is excluded that a winder forms on the cone roller 1. Fin winder will automatically tend to slip towards the free end of the roller. The winder must also pass the groove end 15 or the entrance of the thread suction channel 16. Most winders are therefore already caught here and suctioned through the thread suction channel 16 by means of the injectors 21. If the winder is too stubborn for this, it continues to slide to the free end of the cone roller 1, where it falls off the cone roller 1 and either falls out of the housing or can be removed. As indicated by 31, a flexible hose can also be connected to the free end of the housing, which leads into the waste. It can be assumed that there is considerable air pressure in the gap 11 between the housing inner wall 9 and the cone 1 as a result of the air flow in the channel strip 14, groove 12, thread outlet 16. Therefore there is in this Gap 11 sufficient air flow to the free end to remove thread and winder remnants. In addition, it was found that a possible winder blocks the gap 11 like a piston and is therefore conveyed towards the free end by the air pressure which builds up behind it.

Further exemplary embodiments with the possibility of pneumatic thread application are shown in FIGS. 8 and 9. 8 is constructed as follows:

The housing 5 has a bore which is conical in its lower part 9. The housing 5 is closed on its upper face by a cover 77. The cover 77 is connected to the housing by screws 74. In a socket 8 of the cover 77, which is concentric with the pipe 9 in the housing 5, there is the position 4 of the winding body 1. The winding body 1 is part of a structural unit with the shaft 2, the turbine wheel 3 and the winding body 1. The shaft 2 is firmly connected to an end face 25 of the turbine wheel and is freely rotatably supported in the bushing 8 by two ball bearings. The turbine wheel 3 consists of the two end disks 25, between which the turbine blades 26 (section according to FIG. 7) are fastened, for example by welding. The winding body 1 is seated on one end disk 25 of the turbine wheel 3. The winding body 1 is a bonus which has essentially the same conicity as the bore 9 in the housing 5. As a result, the winding body forms an annular thread chamber 9 in this bore, which also tapers conically towards the free end of the winding body 1 with respect to its mean diameter. In the embodiment according to FIG. 8, the cone angle of the winding body 1 is smaller than the cone angle of the bore 9. As a result, the width of the thread chamber 9 also tapers towards the end of the winding body 1. At its upper, clamped end the winding body 1 has a bead 38 which forms a narrow channel in the form of an annular nozzle 79 with the cylindrical part of the bore in the housing 5.

The upper cylindrical part of the bore in the housing 5 forms an annular channel 80 with and around the turbine wheel 3. The compressed air channel 27 opens into this annular channel 80. The compressed air channel 27 is directed essentially tangentially into the annular channel. Its orientation and the shape of its mouth is generally known in the construction of compressed air turbines and is not described in more detail here. Since the bead 38 of the winding body 1 of the cylindrical chamber wall in the housing 5 forms an annular nozzle with strong throttle resistance, the required air pressure can build up in the annular channel 80. The turbine wheel can be driven at speeds of up to 10,000 rpm.

The blades 26 of the turbine wheel leave the outflow channel 28 free in the center of the turbine wheel. The outflow channel is closed on the bearing side by the end plate 25. The outflow channel 28 opens to the free end of the winding body 1 in its central channel 81, the other end plate 25 also having a correspondingly large hole. The pin 73 in the center of the turbine wheel 3 is shaped such that the air passing between the blades 26 is deflected in the direction of the central channel 81 in the winding body 1.

On the side of the bead 38 facing away from the ring channel 80, the thread inlet 14 opens into the housing bore 5. The thread inlet 14 lies essentially on a tangential plane of the winding body 1. The thread inlet 14 can lie on a normal plane of the winding body 1. However, the thread inlet channel 14 can also be arranged such that it crosses the axis of the winding body 1 at an obtuse angle in the projection according to FIG. 8. With others Words: The thread conveyed by thread inlet 14 can also have a movement component in the direction of the free end of the winding body 1.

An end piece 68 is attached to the housing 5. In this end piece, the thread chamber 9 ends in a conical, rounded blind hole 69. The end piece 68 also has a wide incision 70 on its edge. The incision is rounded towards the blind hole and, in the installed state, lies in a normal plane in the region of the thinnest end of the rotating body 1. The incision 70 is aligned with the suction channel 16, which is flanged to the housing end piece 68 and is fitted with injectors 21. The cross section of the suction channel 16 is essentially adapted to the adjacent cross section of the incision 70 with which the incision 70 opens into the suction channel 16.

About the function:

The same sequence control described above for FIGS. 5 and 5A is used for thread application. First, the turbine with the rotating body 1 is started. Then the compressed air supply to the turbine is essentially switched off and the suction device in the suction pipe 16 is supplied with compressed air. The thread is now held in front of the thread inlet 14 and sucked in. The peripheral speed of the rotating body 1 corresponds at least to the thread speed. The thread now comes into circumferential contact with the rotating body and is formed into turns, dip around the rotating body. As a result of the taper of the rotating body and due to the air flow which emanates from the annular channel 80 via the bead 38, the turns are conveyed to the thin end. There, the windings collect and as a result of the air flow coming through the central channel 81 _ starting from the turbine wheel 3 _ and as a result of the air flow in the filament chamber 9, the vault falling from the rotating body 1 is not only collected in the blind hole 69, but also due to the air flow to the suction channel 16 at the same time also promoted in the direction of the incision 70 and the suction channel 16. There the bulge is detected by the injectors 21 and placed under a certain tension. This causes the vault to pull out into a smooth thread again. Since the suction channel 16 lies in a normal plane which intersects the rotary body in the region of its thinnest, the thread is now drawn off tangentially from the rotary body, as indicated by line 71. Now the major part of the compressed air is returned to the turbine. The suction device receives only so much compressed air that a sufficiently high thread tension 52 of the thread running off the roller 1 is generated in order to generate the thread tension resulting from the looping in the thread running towards the roller 1.

The thread turns, which are formed in the normal plane of the thread inlet in the rotating body, continue to slide due to the conicity, the low friction and the air flow on the cone. The thread tension in the reverberation of the thread inlet 14 can be adjusted by setting the speed and the torque of the rotating body 1 as desired and so high that a godet (not shown here) can be applied without the winder being formed on the godet. The turns slipping on the bonus, on the other hand, lose their thread tension, so that the thread can be easily conveyed in the suction channel 16. The suction flow required for this can be generated with the injectors 21 without any particular effort.

In this version, the thread pulling device is also suitable for storing a thread in the form of a fleece, felt or as waste.

The embodiment according to FIG. 9 essentially corresponds to the embodiment according to FIG. 8 with regard to the thread guidance.

This thread take-off device can be used in particular for waste disposal or for the further processing of the thread.

For a description of the exemplary embodiment according to FIG. 9, reference is made to FIG. 8. The structure of the thread take-off device can be found in the description of FIG. 8 with the following addition:
As a thread inlet, the housing 5 has a wide slot 61 on its circumference. This slot extends over part of the circumference with such a central angle that the thread can be placed through this slot 61 with a wrap around the winding body 1. A casing 62 is displaceable on the housing 5. The jacket is pressed into its outer right position by spring 63. The force of the springs can be adjusted by screw 64. The jacket 62 has the thread inlet connector 14 on its circumference.

The thread inlet nozzle is directed essentially tangentially to the circumference of the rotating body 1 and its thread channel also extends through the jacket 62. The thread inlet nozzle 14 can be populated with the indicated injectors 18 which cause a suction flow in the inlet nozzle. The thread inlet connector 14 is designed so that it lies in the outer right position, which is shown in Fig. 9, substantially on the normal plane and the working area of the winding body, which has the largest diameter.

The thread guide 65 is fastened to the jacket 62. The thread 59 coming from a spinneret and to be applied to the take-off unit 60 or coming from the take-off unit 60 is tensioned between the fixed thread guides 66 and 67 on the one hand and the thread guide 65 movable with the jacket 62 on the other hand. As a result, the jacket 62 is shifted to the left against the force of the spring 63 as the thread tension increases. Fixed means that the thread guides are immovable with respect to the housing 5 of the thread take-off device.

For the function, reference is also made to the description of FIG. 8. The following deviations and additions result:

Threading in circumferential contact with the rotating body is facilitated if the jacket 62 is moved to the left against the spring force 63 in FIG. 9, so that the thread initially runs onto a smaller diameter of the rotating body 1. After catching, the jacket is released into its right extreme position predetermined by the spring 63 and a stop.

Since the suction channel 16 lies in a normal plane, which cuts the rotating body in the region of its thinnest end, the thread is drawn off tangentially from the rotating body after it has been put on, as indicated by line 71.

The thread turns on the rotating body continue to slide due to the taper and the low friction, the thread tension above the thread inlet 14 not only by adjusting the speed of the rotating body 1, but also by shifting the jacket 62 and thus the point of the thread on the roller 1 as desired and can be set so high that the thread can be placed on the delivery godet 30 running at a constant, high peripheral speed without 30 winder being produced on the delivery godet. The turns slipping on the cone, on the other hand, lose their thread tension, so that the thread, e.g. is guided into the waste or onto a collection or transport container in which the suction channel 16 can easily be conveyed. The air flow required for this can be generated with the injectors 21 without any particular effort.

As indicated in Fig. 9, the thread can also be withdrawn from another delivery plant. Furthermore, the thread pulling device can regulate the thread tension between the Delivery godet 30 and the thread take-off device are used. For this purpose, the thread is placed around the thread guides 66, 67, 65 in the manner shown, which serve to measure the thread tension.

The width of the slot 61 determines the working area in which the point of the thread can be moved onto the winding body 1. Depending on the position of the thread guide 65 and the thread inlet connector 14, the thread is wound on the winding body 1 at a higher or lower winding speed. As a result, the thread tension can be controlled and regulated by adjusting the position of the jacket 62. When the thread tension increases, the thread guide 65 and thus also the jacket 62 are shifted to the left. As a result, the thread inlet connector 14 lies on a normal plane with a smaller diameter. As a result, the winding speed drops and the thread tension decreases. There is therefore an equilibrium state between the thread tension on the one hand and the spring force 63. Therefore, the target value of the thread tension can be specified by setting the spring force 63. This ensures that the thread tension, which is given to the thread by the take-off device, is always sufficient to avoid winders on the take-off mechanism 60 or to exert constant thread forces on the thread to influence the thread properties.

Claims (17)

1. Thread take-off device for drawing off a running thread, having a thread supply mechanism (1) with a driven roller, round which the thread is to be looped, and having a downstream suction apparatus which carries the thread away in an air stream, characterised in that the suction mouth (16) of the suction apparatus (24) is disposed in the direct vicinity of the surface of the supply mechanism (1) and along a run-off tangent of the run-off end (4, 7) of the supply mechanism transversely, preferably substantially at right angles, to the longitudinal extension of the supply mechanism (1).

2. Device according to claim 1, characterised in that the supply mechanism (1) comprises a conical roller which is over-mounted at its thick end.

3. Thread take-off device for drawing off a running thread according to one of the preceding claims, having a thread supply mechanism (1) with a driven roller, round which the thread is to be looped, and having a downstream suction apparatus which carries the thread away in an air stream, characterised in that the suction mouth (16) lies in the direct vicinity of the surface of the supply mechanism (1) and adjoins the supply mechanism substantially in an axial or paraxial direction, with the run-off end (47) of the supply mechanism (1) being directed towards the inlet of the suction pipe (16).

4. Device according to claim 3, characterised in that the suction pipe (16) of the suction apparatus (24) has a widened inlet, that the run-off end (47) of the supply mechanism (1) protrudes into and is enveloped by said suction pipe, and that a thread guide (41) is disposed on a tangent of the run-off end.

5. Device according to one of the preceding claims, characterised in that the thread supply mechanism (1) and the suction apparatus (24) are combined into a handling unit.

6. Device according to one of claims 1 or 3 to 5, characterised in that the supply mechanism (1) comprises two rollers (32, 33) disposed adjacent to one another at a slight distance apart and rotating in the same direction, of which at least one is drivable and whose roller axes (25, 26) cross towards one another or together enclose an acute angle (34).

7. Device according to one of the preceding claims, characterised by a thread application device comprising a thread guide (52, 56) which travels round the supply mechanism (1) and is open transversely to its direction of movement.

8. Device according to claim 7, characterised in that the thread guide (52, 56) in travelling round the supply mechanism (1) imparts an axial feed movement (55) to the thread.

9. Device according to one of claims 1 to 6, characterised in that the supply mechanism (1) is surrounded above the region of thread looping by a flow channel (gap 2, groove 12) which winds more than 180°, preferably 360° or more, round the supply mechanism, which forms with the surface of the rollers (32, 33) of the supply mechanism a gap of at least the thread thickness which is open at its end facing the surface and which at its ends is flush with the thread inlet channel (14) and the thread extraction channel (16), with the thread extraction channel (16) being connected to the suction apparatus (24) so that a suction air flow directed from the thread inlet channel to the thread extraction channel is produced in the thread inlet channel, the flow channel and the thread extraction channel.

10. Device according to claim 9, characterised in that the flow channel (groove 12) has an axial feed component.

11. Device according to claim 9 in conjunction with one of claims 1 to 5, characterised in that the supply mechanism (1) comprising only one roller (33) is supported in a housing (5) which with the surface of the roller (33) forms the narrow gap (11).

12. Device according to claim 9, 10 and 11, characterised in that cut into the housing wall (9) as a flow channel is a helical groove (12) which winds at least 180° round the roller (1).

13. Device according to claim 11 or 12, characterised in that the thread inlet (14) and the thread outlet channel (16) connected to the suction apparatus (24) each lie substantially along a tangent of the supply mechanism and are offset, preferably axially, relative to one another.

14. Device according to one of claims 11 to 13, characterised in that the supply mechanism (1) is a conical roller (33), and the housing shell (9) is adapted conically to the roller.

15. Device according to one of claims 11 to 14, characterised in that the roller (33) is supported at one end and the housing is axially open at the free end of the roller.

16. Process for applying a synthetic thread coming from the spinning nozzle onto a rotating machine part, in particular a galette or take-up device, which is driven at a peripheral speed in excess of 4000 m/min with the aid of a suction air stream, characterised in that the suction air stream is conveyed in a vortex around a supply mechanism and is drawn off tangentially, with the supply mechanism being driven at least at the peripheral speed of the rotating machine part and with the vortex having the same direction of rotation as the supply mechanism.

17. Process for applying a synthetic thread coming from the spinning nozzle onto a rotating machine part, in particular a galette or take-up device, which is driven at a peripheral speed in excess of 4000 m/min with the aid of a suction apparatus, wherein the thread delivered by the spinning nozzle is first intercepted and extracted by the suction apparatus and is then brought at a point directly in front of the suction apparatus into frictional contact with a thread supply mechanism, which is driven at a peripheral speed which is at least equal to the peripheral speed of the rotating machine part, characterised in that in a sequence control the thread supply mechanism is driven by compressed air; the suction apparatus is acted upon by the bulk of the compressed air and the thread is sucked in, is applied onto the supply mechanism running with a reduced drive energy and is extracted; the thread supply mechanism is driven with the bulk of the compressed air and the suction apparatus is acted upon only by a residual quantity of the compressed air.

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