WO2004013028A1

WO2004013028A1 - Device for catching a thread at the beginning of a reeling operation

Info

Publication number: WO2004013028A1
Application number: PCT/EP2003/008100
Authority: WO
Inventors: Görke CARSTEN; Matthias Hollstein
Original assignee: Georg Sahm Gmbh & Co. Kg
Priority date: 2002-08-01
Filing date: 2003-07-24
Publication date: 2004-02-12
Also published as: CN1675119A; ATE338004T1; ES2270112T3; JP4021895B2; WO2004013028A9; DE50304877D1; JP2005534589A; DK1525150T3; EP1525150A1; CN1323020C; EP1525150B1; DE10235209C1

Abstract

Disclosed is a device for catching a thread (11), which continuously arrives at a reeling machine with at least two reeling spindles (5,6), at the beginning of a reeling operation and for winding the thread (11) in order to form a reel (8) on a sleeve (7) which can be placed upon the reeling spindle (5,6). The inventive device has a catching bushing (16) which is placed on the free end of the reeling spindle (5,6) and which comprises a catching slit (17) and a friction bar (20) arranged in the centre of the catching bushing (16). A guide bushing (18) is provided in addition to the catching bushing on each reeling spindle (5,6), comprising a guiding slit (19) which surrounds the catching bushing (16) in a radial direction and which is arranged such that it is axially offset in relation to the catching bushing (16). A clamping device (34) is provided between the clamping bushing (16) and the guide bushing (18) in order to fix the thread (11) when the reels are changed automatically.

Description

DEVICE FOR CATCHING A THREAD AT THE BEGINNING OF A REEL TRAVEL

The present invention relates to a device for catching a thread continuously arriving at a winding machine with at least two winding spindles at the beginning of a winding trip and for winding the thread into a bobbin on a sleeve which can be placed on the winding spindle, the device comprising a catch bushing arranged at the free end of the winding spindle with catch slot and a friction bolt arranged in the center of the catch bushing. Such a device is about continuously winding a thread that is continuously produced or in any case continuously feeding into a winding machine, apart from the first application process, into bobbins on tubes. The winding machine has at least two winding spindles to enable an automatic bobbin change. As a rule, these two winding spindles are arranged on a turntable and are pivoted alternately into an operating position, while the wound bobbin which has just ended is removed from the winding spindle which is not in the operating position and a new sleeve is pushed on. For an automatic bobbin change, it is necessary to cut the thread. With this cutting process, the end of the thread on the bobbin just finished is determined at the same time. On the other hand, a thread start is formed with which the winding travel on the new tube begins. It is important to thread the thread for the first time after production has started or after a business interruption. This is done by hand, ie using a suction gun. This unique process is followed by any number of automatic bobbin changes. The part of the thread that usually runs through a top thread guide to a thread guide or a traversing thread guide in front of a bobbin in the operating position is called the "incoming thread". The thread between the thread guide or traversing thread guide and the winding spindle which is in operation is called "running thread". The "running thread" is that Part of the thread that is between the winding spindle in operation and the almost fully wound bobbin.

STATE OF THE ART

A device of the type described in the opening paragraph is known from the applicant's publication "SAHM 230E 230GE" No. 70141-913 / 3, edition 10/96. Each winding spindle has a device for catching the thread at its free end. This device essentially consists of two parts, namely a catch bushing with a catch slot and a coaxially arranged friction bolt. The catch bush is a bush or sleeve-shaped part with an axial length of a few centimeters. The outside diameter of the catch bushing is the same or slightly smaller than the outside diameter of the winding spindle. The inner diameter of the catch bushing is somewhat smaller, so that a solid, resilient body is created, which, however, is usually designed as a plastic body. In the front of the catch bushing, a catch slot begins, which is arranged obliquely to the surface line of the catch bushing or to the axis of the winding spindle. The angle at which the catch slot is arranged obliquely is relatively large, ie the catch slot is arranged relatively steep. The catch slot begins on the front side and ends closed in the catch bushing at a certain axial depth. The catch bushing is arranged on the winding spindle in such a way that at least the axial region in which the catch slot extends is not covered by a properly pushed-on and fixed bushing. The catch slot is arranged to match the direction of rotation of the winding spindle in order to be able to insert a thread approached from the end face into the catch slot. In the interior of the catch bushing, which is hollow in this respect, the friction bolt is arranged, which has a substantially smaller outside diameter than corresponds to the inside diameter of the catch bushing. This creates an annular space between the friction pin and the catch bushing, into which the front end of a suction pistol is inserted by hand and the thread can thus be put on. The friction pin has the task of exerting a certain friction on the thread by winding the thread on it while the winding spindle is rotating, which serves to achieve a fixation of the thread. The total friction, which leads to a fixation, that is, a fixation of the thread, is also determined by several influencing variables, for example also by the formation of the bottom of the catch slot in which the thread is deflected. Another The friction component is generated by the area of the thread that forms on the outer circumference of the catch bush immediately after entering the catch slot.

This known device for catching a thread continuously arriving at a winding machine only allows manual application with a suction gun, which must be repeated for each bobbin at the beginning of the winding cycle. For this purpose, the incoming thread is sucked off from the suction gun, ie made manageable. The front end of the suction gun is inserted into the space between the friction bolt and the catch bush. When the winding spindle rotates, there is an end face contact of the thread on the catch bushing, so that the thread can run into the catch slot. During this procedure, the thread is sucked off further via the suction gun. As soon as the thread has entered the catch slot, there is an increase in friction on the thread. The increasing friction means that the thread slips less and is sucked off by the suction gun at a decreasing speed. Finally, the total friction becomes so great that the thread stands still relative to the catch slot, that is, the thread is fixed to the device. Due to the continued winding on the friction pin, a small part of the thread is pulled out of the suction gun. By simultaneously removing the front end of the suction gun from the free space, it is possible to cut the thread with scissors or the like. The thread then runs due to the laying triangle and / or the action of a traversing device on the sleeve, overcoming the jump in diameter from the outside diameter of the catch bushing to the outside diameter of the sleeve. Then the bobbin winding then begins in any case, possibly with the formation of a previous fixing winding, reserve winding or the like. The thread is guided accordingly by the thread guide or the traversing thread guide. The known device is already advantageous in that it enables the use of normal cylindrical sleeves without any catching device. Rather, the catching device is located on each winding spindle and is therefore available again for each winding. The disadvantage is that the known device is only a thread application by hand, ie. H. with a suction gun. An automatic spool change is not possible.

On the other hand, e.g. B. from DE 197 43 278 C2 or DE 196 46 335 A1 special sleeves known, which are equipped with a catch area. The catch area can consist of an incision made over part of the circumference of the sleeve, the one Clamping gap for fixing the thread forms. It is also possible to form such a clamping gap by means of an incision made on the end face of the sleeve. In connection with this, complexly constructed traversing devices with a plurality of thread guides are used in order to bring the thread relative to the clamping gap, which lies outside the normal traversing stroke. Such special sleeves advantageously allow an automatic spool change. However, they require the use of comparatively expensive special sleeves. The thread tail unit must be of relatively complicated design, including the separate drives for up to three thread guides, which have to take over the thread depending on the operating situation.

Another direction of development of a safety gear is known from DE 196 37 298 A1. The sleeve is held on the right and left by a centering plate, so that it is possible to use normal sleeves. One of the centering plates is designed as a catching device in a special way, i. H. studded with catch noses. The catch lugs are arranged on a larger diameter than the outer diameter of the sleeve. Here too, the thread is caught in conjunction with a traversing thread guide. A disadvantage of this device is that the two centering plates have to be separated from one another in order to change the spool. This makes the training and the drive of the centering plate complex. Such a catching device is indeed suitable for automatic thread transfer. However, it cannot be firmly connected to a winding spindle, in particular not to a winding spindle which has a free projecting end. A new sleeve can only be pushed on if the catch device is temporarily removed from the winding spindle.

OBJECT OF THE INVENTION

The invention has for its object to develop a device of the type described above so that on the one hand the thread by hand, that is, with a suction gun, for. B. after a business interruption, as well as subsequently an automatic bobbin change when using normal tubes without catch area is possible. SOLUTION

According to the invention, this is achieved in a device of the type described at the outset in that, in addition to the catch bushing, a guide bushing with a guide slot is provided on each winding spindle, which surrounds the catch bushing in the radial direction and is axially offset from the catch bushing, and that between the catch bushing and the guide bush is provided with a clamping device for fixing the thread in the case of an automatic bobbin change.

The new device further develops the generic device. She uses the generic device to realize the advantages of applying by hand, as it becomes necessary after a work break. To implement the automatic spool change, however, the catch bushing with catch slot is assigned a guide bushing with guide slot. The guide bush has a larger diameter than the catch bush and, viewed axially in the direction of the winding spindle, adjoins the catch bush inwards, that is, in the direction of the coil to be formed. The guide bush has an end face which is arranged axially overlapping with the catch slot of the catch bush. The guide bush thus surrounds the catch bush in a small axial area. The outer diameter of the guide bushing is expediently equal to or smaller than the inner diameter of the sleeves used. The guide bush has a guide slot which is assigned to the catch slot of the catch bush, so that a connection of the two slots to one another is possible at least in the axial direction. Since the device fulfills its function when the winding spindle is rotating, it is not necessary to assign the catch slot to the guide slot in certain angular ranges. Of course, the guide slot must be arranged on the same side at an angle to the surface line of the guide bush or to the axis of the winding spindle as the catch slot. The catch bushing and the guide bushing are arranged on different diameters, but differ relatively little in terms of their diameter jump, while a large diameter jump is still required between the catch bushing and the friction bolt, as is necessary for manually threading the thread. Furthermore, a clamping device is provided between the catch bushing and the guide bushing for fixing the thread during the automatic bobbin change. This clamping device serves to fix the thread, that is to say fix it, so that it stands still relative to this clamping point. This fixation is used in two ways. On the one hand, it serves to sever the thread, that is, the thread that is running out Thread to allow the almost finished wound bobbin. In the other direction, the beginning of the running thread is formed and placed on the winding spindle, so that a new winding is started on a new tube.

With the new device, the first application process can be carried out by hand using a suction gun as follows:

The incoming thread is picked up and sucked off by the suction gun. The front end of the suction gun is inserted into the space between the friction pin and the catch bush. When the winding spindle rotates, there is contact with the thread on the end of the catch bush. The thread runs into the catch slot. Depending on the relative position of the guide slot on the guide bush, there are initially a few wraps around the circumference of the catch bush with the thread subsequently passing into the guide slot. All this is achieved even without being influenced by a thread tail unit due to the laying triangle, according to which the thread always strives to take the shortest distance. During this handling, thread is still sucked into the suction gun, ie the thread slips at all contact points. At the same time, the thread is also wound onto the friction pin, since the catch slot encircles the friction pin. This increases the total frictional force on the thread and ultimately becomes so large that a clamping effect occurs. This total frictional force results from the wrapping of the friction bolt with the thread, the friction of the thread in the catch slot and possibly on the circumference of the catch bush and the friction in the guide slot. With the onset of the clamping action and the relative fixation of the thread to the guide slot, the thread is taken over by the winding spindle or the device, so that a winding process then begins. Here, the thread is taken over by the thread tail or the traversing thread guide of the thread tail and moved depending on the desired winding result, e.g. B. first by means of a fixing winding, possibly a reserve winding, and finally in the normal laying stroke to form the coil. In parallel, the thread is manually cut by a process such. B. with scissors, between the friction pin and the front end of the suction gun. During this application process, the thread also exceeds the edge of the sleeve and the resulting jump in diameter. However, this is not chosen too large to keep the associated jump in thread tension manageable. After the first bobbin has been largely wound, an automatic bobbin change takes place at the end of the winding cycle. For this purpose, the turntable with the two winding spindles is rotated in such a way that the second winding spindle with the previously fitted normal sleeve comes into the operating position, while the sleeve with the almost finished wound bobbin is turned into the ready position. The thread slips on the circumference of the new sleeve in accordance with the movements of the traversing thread guide. The traversing thread guide is finally moved outside the normal laying stroke in such a way that the running thread comes into contact with the area and the circumference of the catch bush. A deflection device, which works with the aid of a deflection arm or some other controlled device, prevents the thread from falling off the full bobbin. To this extent, the running thread is properly wound on the full bobbin. The running thread is prevented from entering the catch slot by contact with the circumference of the catch bushing. The aim of this is not to let the thread come into contact with the friction pin in order to avoid an excessive diameter jump which could have a negative effect on the thread tension. To this extent, the running thread is guided on the circumference of the catch bush and runs alone into the guide slot of the guide bush. This results in a change in direction and speed of the thread running off and, consequently, a jerky increase in tension. This leads to the thread suddenly being fixed in the clamping device between the catch bush and guide bush. This fixation leads to tearing of the thread, even with very tensile thread material. By clamping the thread in the clamping device, on the other hand, a new thread start is formed and fixed in the operating position in the area of the new winding spindle, so that a new winding process can now begin automatically on the new winding spindle or sleeve. Here too, the laying triangle can be used to wind the thread around the circumference of the guide sleeve by a few windings, then to cross the front edge of the sleeve and finally to reach the middle position of the laying triangle. These movements of the thread in the lateral direction can be facilitated or supported by the traversing thread guide, by movements of the thread tail unit and / or by axial displacement of the winding spindle. At the beginning of a winding after fixing the thread, a fixing winding, a reserve winding and finally the bobbin can also be formed here. SR catch slot and the guide slot can be arranged at different angles to the anti-lines of the catch bush or the guide bush. The guide slot is steeper than the catch slot. An angle of between 45 ° and 90 ° to the surface line of the guide bushing can be provided for the guide slot, n angles in the range of 80 ° being preferred. The angle of the catch slot is set in the range between 10 ° and about 60 ° to the surface line. There is also the possibility of arranging the slot and guide slot at the same averaged angle. It is important that the catch slot is arranged at an angle such that it is oblique to the surface line of the square bushing so that when the bobbin changes automatically, the contact of the incoming thread with the cylindrical circumference of the catch bush does not cause the thread to enter the catch slot, but only in the guide slot , leads. If the thread falls through during its circumferential contact during automatic bobbin change down to the diameter of the friction bolt, the thread then changes too much in the thread, with corresponding disadvantageous consequences. Since the outside diameter of the catch bushing runs in an area approximating the diameter of the winding spindle, an excessively large jump in tension on the thread is avoided, so that the catch slot can be arranged at an angle smaller than the guide slot to the existing surface line.

^r, the catching slot hen uncovered rea catch beech addition to in the covered axially by the guide bush rea of the catching bushing extends beyond the axial of the guide bush, there is a possibility that a part of the terminal vischen the catching slot and the guide slot upon application of the yarn by hand is given in order to achieve the same starting situation, for example, relative to a hanger thread guide, regardless of whether the thread was put on by hand or automatically put on in the automatic bobbin change.

he guide bush should have an outer diameter that is equal to or less than 3r the diameter of the winding spindle receiving the sleeve. The guide bush should thus have an outside diameter that differs too much from the outside diameter of the winding spindle, but nevertheless allows the removal of a sleeve with the coil fully developed and the pushing on of a new sleeve. In this way, the jump in thread tension, which results when the thread rises above the sleeve, is kept small, so that it is easily compensated for Control devices, for example a dancer arm, which can be earthed to the winding machine.

The clamping device is arranged axially in the region of the guide slot. The emm device is thus assigned to the guide slot so that when the thread 1 guide slot enters, the clamping device comes into effect. This is especially true for 3n automatic bobbin changes. When applying by hand, the clamping device can come into effect, but it does not have to, because the increase in friction required for fixing the thread is also determined here by the proportion of friction that is applied to the friction bolt. This proportion of friction is not available in the case of automatic coil change, so that the increase in friction by the emm device is essential here.

There are various possibilities for realizing the clamping device, so that the clamping device has a ring made of elastic material, which forms a clamping gap with the outer circumference of the guide bush for fixing the thread for the purpose of driss. With such a ring, in the simplest but very effective embodiment, it can be an O-ring inserted into a groove on the circumference of the catch bushing, the outer circumference of which rests on the inner circumference of the guide bushing) Connection with the guide slot formed a clamping gap approx. However, it is also possible to see a ring of resilient metal at this point or another clamping device. The clamping device only has to be 5in suitable to be accommodated in a small space, as the diameter difference between the catch bushing and guide bushing provides.

In principle, the base of the guide slot can be formed with sharp edges. Such a: hard-edged training can be realized by an appropriate edge design, the installation of a knife at this point is possible. It is important that the thread is deflected as far as possible, especially for the winding of bobbins made of high-strength winding material in the form of a thread or tape.

The diameter difference between the catch bush and the guide bush should be small and; r The difference in diameter between the catch bush and the friction pin should be large. This makes sense to JS for several reasons. On the one hand, this enables manual application and creates 3r required space between the friction pin and the catch bushing, so that he thread can come into contact with the end area of the catch bushing. On the other hand, the voltage jump that occurs when the thread is transferred from one diameter to the other is kept small due to small diameter differences.

BRIEF DESCRIPTION OF THE FIGURES

In the following, the invention is further explained and described on the basis of preferred exemplary embodiments shown in the figures.

ig. 1 shows a front view of the winding machine after the winding spindle with the empty tube has been pivoted into the operating position, immediately before the thread is torn.

ig, 2 shows a perspective view of the winding machine according to FIG. 1, wherein only the traversing thread guide of the thread guide is shown for reasons of clarity.

ig. 3 shows an enlargement of the front projecting end of the winding spindle according to FIG. 2.

ig. 4 shows a sectional illustration through the device for catching according to FIG

Line IV - IV in Fig. 3.

DESCRIPTION OF THE FIGURES

ig. 1 shows a front view of a winding machine 1 with a front wall 2, behind which I essentially hide the drive and control elements of the winding machine 1. In the front wall there is a turntable 3 which can be driven in steps of approximately 180 ° about a horizontal axis 4. On the turntable 3, white winding spindles 5 and 6 are provided in an opposite arrangement. The winding spindle 5 is shown in the operating position, while the winding spindle 6 can be seen in the change position. The pulse spindles 5 and 6 can be driven and stopped separately clockwise. ϊde winding spindle 5, 6 has a relatively elongated axial cylindrical part which is suitable and intended for receiving a sleeve 7, on which a coil 8 is ultimately wound or produced. Since Fig. 1 shows the state shortly after turning the reed plate 3, the spool 8 is on the sleeve 7 of the winding spindle 6, while it was> essentially wound where the winding spindle 5 with its sleeve 7 is now located.

^f eiterhin one thread is indicated in dash-dotted lines. 9 The thread 9 runs on the top of a head thread guide 10, which is provided in a stationary manner and protrudes from the front wall 2 of the winding machine 1 and on which the thread 9 is deflected. The aden 9 arrives as an incoming thread 11 to a traversing thread guide 12 of an aden tail unit 13. Because of the stroke of the hanging thread guide perpendicular to the drawing plane of FIG. Normally, the incoming thread 11 would be wound on the surface of the sleeve 7 and spool 8. In Fig. 1, however, the traversing thread guide 12 is in a position outside the normal laying stroke at such a point that the incoming thread 11 is located in the area of the device for catching the thread, e is arranged on each projecting end of each winding spindle 5, 6. The thread 14 running from the pulse spindle 5 runs via a deflection device 15 onto the circumference 3r of the bobbin 8 of the bobbin spindle 6 in the changing position. The deflection device 15 at the same time prevents the thread 14 from falling off the spool 8.

The device for catching the aden 1 1 continuously arriving at a winding machine 1 is arranged on each winding spindle 5, 6 in the same way at the projecting free end. An essential component of this device is a catch bushing 16 with a catch slot 17, furthermore a guide bushing 18 with a guide slot 19 and a friction element 20. The diameter ratios of the elements to one another can already be seen from FIG. The friction pin 20 is only about finger-thick, so it has a relatively small outer diameter. The catch bushing 16 has a considerably larger inner diameter 21 and has a certain material thickness up to its outer diameter 22, as is necessary for the formation of a solid body which is resistant to wear. The catch bushing 16 as well Your socket 18 can preferably be made of hard plastic. But le training from metal is also conceivable. It is important that the inner diameter 21 of the ing bushing 16 is considerably larger than the outer diameter of the friction bolt 20, so that an annular space 23 is created which is so large that the front ide of a suction gun for manual application of the thread 11 after an interruption in drive is possible.

e guide bush 18 surrounds the catch bush 16, however, only a short distance. The bushing 18 has an inner diameter 24 and an outer diameter 25. The outer diameter 25 of the guide bushing 18 is only slightly smaller than the diameter of the winding spindle 5 or 6, so that an empty sleeve 7 or a wound coil 8 can be taken up or removed without impairment.

j. 2 shows a perspective representation of the conditions in front of the front wall 2 of the winder 1. The perspective representation makes it easier to see the size relationships and the arrangement of the elements relative to one another. It can also be seen how and to what extent the catch bushing 16 and the guide bushing 18 overlap or do not succumb. The axially furthest part of the device from the turntable 3 is r friction pin 20 (see also FIG. 4). This is followed by the catch bushing 16, which over a known axial length in the region of its cylindrical circumference 26 is not covered axially by the bushing 18, that is to say it extends freely. The catch slot 17 is arranged in this projecting part of the circumference 26 and somewhat beyond. The cylindrical circumference 26 of the catch bushing 16 is formed by a surface line 27, which therefore extends parallel to the axis of the winding spindle 5 or 6. It can be seen from FIG. 2 that the catch slot 17 is arranged at a relatively small angle to the surface line 27. This angle 28 is shown in FIG. 3. The bushing 18 also has a cylindrical circumference 29, which is formed by a surface line 30. The angle 31 between the direction of the guide slot 19 and the anti-line 30 is comparatively larger. The guide slot 19 thus runs more obliquely than the catch slot 17. The guide slot 19 has a base 32 which is sharp-edged, as is shown in particular in FIG. 3. It can also be seen from FIG. 3 that: r catching slot 17, starting from its open edge at the front side 33, extends over the part of the circumference 26 not covered by the guide bushing 18 into a region of the catch 26 that extends radially from the guide bushing 18 is covered. On the other hand It is not important that the catch slot 17 merges directly into the guide slot 19 in the projection, as can be seen approximately from FIG. 3. The relative position of the catch slot 17 to the guide slot 19 is in itself arbitrary, because both the catch bushing 16 and the guide bushing 18 perform their function in a rotating manner, although the catch bushing 16 and the guide bushing 18 rotate together, they can jch by up to 180 ° the circumference offset from one another. This is bridged by n pieces of thread 11, which lies on the circumference 26 of the catch bush 16.

Der / ischen the catch bushing 16 and the guide bushing 18, a clamping device 34 is formed or provided. An essential component of the clamping device 34 is a ring 35 JS elastic material, for example an O-ring, which is inserted into a groove on the outer circumference 26 of the catch bush 16 and is in operative contact with the inner circumference corresponding to the inner diameter 24 of the guide bush 18. The ring 35 is in g. 3 indicated in dashed lines. Between the ring 35 and the inner circumference of the guide bush 18, a clamping gap 3 is formed in the region of the guide slot 19, in which the thread 11, 14 is fixed. The clamping device 34 with the gap 36 forms a fixing and tearing device for the thread, so that on the one hand ΪΓ incoming thread 11 can identify the start of a bobbin 8 on the sleeve 7 of the bobbin spindle 5, while at the same time the end of the thread 14 on the bobbin 8 the sleeve 7 of the mandrel spindle 6 is wound up.

G. 4 shows the overlap of the elements in the axial direction. It goes without saying that the bushing 16 and the guide bushing 18 are permanently attached to the winding spindles 5 and 6, respectively. They are used for each new sleeve 7. As sleeves 7, normal cylindrical sleeves 7 are used on the inside, which have no incision or special special catch device. LIST OF REFERENCE NUMBERS

1 winder 11 incoming thread

2 front wall 12 traversing thread guide

3 turntables 13 thread tail

4 axis 14 running thread

5 winding spindle 15 deflection device

B Spool spindle 16 catch bush

7 sleeve 17 catch slot

8 coil 18 guide bush

9 thread 19 guide slot

3 head thread guides 20 friction bolts

1 inner diameter 31 angle

2 outer diameter 32 reason

3 room 33 front

Inner diameter 34 clamping device

5 outer diameter 35 ring

3 circumference 36 clamping gap

7 surface line

3 angles

9 scope

D surface line

Claims

Device for catching a thread (11) arriving continuously on a winding machine with at least white winding spindles (5, 6) at the start of a winding cycle and for winding the thread (11) into a bobbin (8) on a winding spindle (5, 6) Insertable sleeve (7), the device comprising a catch bush (16) with a catch slot (17) arranged at the free end of the winding spindle (5, 6) and one in the center of the catch beech

16) arranged friction bolt (20), characterized in that on each ipulspindel (5, 6) in addition to the catch bushing (16) there is a guide bushing (18) with a guide slot (19) which the catch bushing (16) in the radial direction surrounds nd axially offset to the catch bushing (16), and that between the start bushing (16) and the guide bushing (18) a clamping device (34) is provided for fixing the thread (11) with automatic bobbin change.

Device according to claim 1, characterized in that the catch slot (17) and the guide slot (19) are arranged at different angles (28, 31) to the surface lines (27, 0) of the catch bushing (16) or the guide bushing (18) are.

Device according to at least one of claims 1 to 2, characterized in that the catch slot (17) is inclined at such an angle (28) to the surface line

17) the catch bushing (16) is arranged so that when the bobbin is changed automatically, the contact of the incoming thread (11) with the cylindrical circumference (26) of the start bushing (16) does not lead to an entry of the thread (11) into the catch slot (1 7) , but only in the guide slot (19).

Device according to at least one of claims 1 to 3, characterized in that the catch slot (17) is arranged obliquely to the respective surface line (27 or 30) at a smaller angle (28) than the guide slot I 9).

Device according to at least one of claims 1 to 4, characterized in that the catch slot (17) does not extend axially beyond that of the guide bush (18) covered area of the catch beech (16) extends into the area of the catch bush (16) which is axially covered by the guide bush (18).

Device according to at least one of claims 1 to 5, characterized in that the guide bush (18) has an outer diameter (25) which is equal to the smaller than the outer diameter of the winding spindle (5, 6) ^, which receives the sleeve (8) ,

Apparatus according to claim 1, characterized in that the clamping device 54) is arranged axially in the region of the guide slot (19).

Device according to at least one of claims 1 to 7, characterized in that the clamping device (34) has a ring (35) made of elastic material which, with the inner circumference of the guide bush (1 8), has a clamping gap (36) for ixing of the thread (11, 14) for the purpose of tearing.

Device according to at least one of claims 1 to 8, characterized in that the base (32) of the guide slot (19) is sharp-edged.

D. Device according to at least one of claims 1 to 9, characterized in that the difference in diameter between the catch bushing (16) and the guide bushing (18) is small and the difference in diameter between the catch bushing (16) in the friction pin (20) is large.