EP1092053B1 - Device and method for separating threads from a layer - Google Patents

Abstract

The invention relates to a method and a device for separating adjacent threads which are stretched in a first and a second location and substantially form together a surface. In order to provide a method and a device serving to reliably separate threads from a yarn layer even when the threads consist of so-called untwisted multifilaments, several threads are grasped with separating means (5, 15, 25, 35) at least in one location, whereupon the grasped threads are subjected to different relative accelerations substantially in their transversal direction. After one or several separation processes, the first thread can be easily grasped, e.g. by a drawing-in hook and then removed from the layer.

Description

The invention relates to an apparatus and a method for dividing adjacent threads that are attached to one first and a second position are clamped and together essentially form a surface or a layer.

The division of threads is a step, for example for pulling warp threads into the crockery elements a weaving machine must be made. In this In this case, the warp threads are stretched in a frame before where they form a warp thread layer together. there the individual threads are very close together. Before the They are supposed to be separated from the shift, what means that they have to be separated. The is not always easy. The problem also arises when tying in warp threads of an old one, already with Provided weft threads and thus part of a fabric Warp thread layer, to a new warp thread layer. Here too warp threads are clamped in a frame and must be separated from the layer by the knotting machine become.

In known devices and methods for dividing such Threads are e.g. Needles between the individual threads introduced to delimit adjacent threads, so that they will be recorded individually for the pull-in process later can. Or, it becomes a so-called crosshair inserted between the threads, two, to the warp threads cross cords drawn between the warp threads or woven into it. For division, e.g. alternately at one end or at both ends of the crosshair are pulled, whereby the foremost thread of the rest is separated.

A disadvantage of such known methods and devices is particularly seen in the fact that the insertion of needles for warp threads that consist of so-called multifilaments, reaches its limits. This is especially true if this Multifilaments are untwisted, have a small titer, or if the density of the thread layer is very irregular is. The procedure with the crosshair must also be inserted the cords can be divided by hand or, for example mechanically with needles, so that there the Problems just described also occur. Although the Warp threads are neatly divided and stored through the crosshairs inserting the separating cords means an additional one and often very complex operation. unclean divided warp threads lead however when weaving or already during Linking the weaving chains to interruptions and thus to insufficient Productivity. This also applies to double thread detection is provided, such as in knotting machines is applied.

Further methods are known from FR 698 064 and GB 2 117 419, where - without using a crosshair - the Divide the threads from the thread layer alone by one Rotating body is made, the circumference of a thread-like Has profile. But these methods are only suitable for dividing staple yarns or twisted multifilaments. For untwisted yarns that consist of several fibrils, the yarns are only in the individual fibrils divided up. So a clean compartment is hardly possible anymore.

The object of the invention is to provide a method or a device, in particular for using this method, propose with which the division of threads a layer of thread can be carried out safely even if the threads are made of so-called untwisted multifilaments or fibrils.

The invention as characterized by claim 1 is therefore solves this task, according to a first aspect of the invention, according to which a device for dividing individual Threads from one layer made from a variety of there are threads clamped in at least two places which is characterized in that the Device on a release agent for detecting multiple threads at least one place and to effect different ones relative accelerations of the detected threads in Essentially includes their transverse direction.

According to a second aspect, the task is solved by in claim 12 a method for dividing individual threads from a layer consisting of a variety of at least two places clamped threads is proposed which is characterized by the fact that with a release agent several threads in at least one place recorded and different relative for the recorded threads Accelerations in essentially their transverse direction be effected.

Preferred embodiments of this invention result in each case from dependent claims 2 to 10 or 13 to 21.

According to the invention, a layer consisting of a Variety of threads clamped in at least two places exists, e.g. of warp threads stretched in a frame, with a release agent several threads on at least one each Position recorded and different for the recorded threads relative accelerations in essentially theirs Transverse direction. This results in a progressive Movement, which is preferably for that of the not covered Warp thread layer most distant thread at largest, so that - if it is the distance to the second thread already allowed - from this new position captured by a pull-in needle, for example, and from the Layer can be removed. Should be a one-time acceleration of the threads captured in essentially theirs Cross direction is not enough because the first thread is still located too close to the second, the captured and deflected Threads captured at another point and then be deflected again. If it's the distance allowed to the second thread, the first thread can now from this new position, for example from a pull-in needle, captured and removed from the layer. The Detection and deflection can take place alternately as long as until the first thread is at a sufficient distance from the second Thread is located. Of course, the recorded Threads released after being followed by one Grasp and deflect their mutual position additionally should change.

1. eine - um eine zur Schicht mindestens annähernd parallele Achse - drehbare, schrauben- oder spiralförmige Förderschnecke mit einer zunehmenden Steigung;

2. zwei - um eine erste, im Wesentlichen rechtwinklig zur Ebene der Schicht stehende Achse - bewegbare Klemmbalken umfasst, welche so zueinander angeordnet werden können, dass sie die von ihnen erfassten Fäden zwischen sich einklemmen;

3. zwei sich im Wesentlichen senkrecht zur Ausdehnungsrichtung der Fäden erstreckende, elastische Balken umfasst, welche so zueinander angeordnet werden können, dass sie die von ihnen erfassten Fäden zwischen sich einklemmen;

4. drei - um eine erste, im Wesentlichen rechtwinklig zur Ebene der Schicht stehende Achse - bewegbare Trennbalken umfasst, welche so zueinander angeordnet werden können, dass sie von den Fäden mindestens teilweise umschlungen werden.

The device suitable for this purpose has at least one release agent for detecting a plurality of threads from a layer consisting of a plurality of threads clamped in at least two locations, which preferably comprises:

1. a screw or spiral screw conveyor, which can be rotated about an axis that is at least approximately parallel to the layer, with an increasing gradient;

2. comprises two clamping bars which can be moved about a first axis which is substantially perpendicular to the plane of the layer and which can be arranged in relation to one another in such a way that they clamp the threads which they have captured between them;

3. comprises two elastic beams which extend substantially perpendicular to the direction of expansion of the threads and which can be arranged relative to one another in such a way that they clamp the threads they have captured between them;

4. comprises three separating bars which can be moved about a first axis which is essentially at right angles to the plane of the layer and which can be arranged relative to one another in such a way that they are at least partially wrapped around by the threads.

The advantages achieved in this way are particularly great see that the division is now in a single step for all kinds of threads such as staple yarns, multifilaments with large or small titer and with any number twisted or untwisted fibrils safely performed can be. This procedure can also be used for partitioning applied to drawing machines and tying machine frames become. In addition, the thread is very gentle treated.

In addition, depending on requirements, each can be used individually Release agent category, i.e. to the swiveling or elastic clamping bar or to the swiveling separating bar an additional release agent of the 2nd to 4th category be assigned to the detection and deflection reciprocally to allow until the first thread in sufficient Distance from the second thread. It also has proved to be beneficial, in addition to Category 1 another so-called pusher, which controls the pressure of the threads enlarged to the screw or spiral screw conveyor, to use. Can also, to reinforce the separation effect - A second screw conveyor can be provided.

Fig. 1

Eine Draufsicht auf eine Schicht von eingespannten Fäden sowie das Erfassen von einigen Fäden gemäss einer ersten Ausführungsform der Erfindung;

Fig. 2

Das Trennen von einigen Fäden gemäss einer ersten Ausführungsform der Erfindung;

Fig. 3

Eine Draufsicht auf eine Schicht von eingespannten Fäden sowie das Erfassen von einigen Fäden gemäss einer zweiten Ausführungsform der Erfindung;

Fig. 4

Das Trennen von einigen Fäden gemäss einer zweiten Ausführungsform der Erfindung;

Fig. 5

Eine Draufsicht auf eine Schicht von eingespannten Fäden sowie das Erfassen von einigen Fäden gemäss einer dritten Ausführungsform der Erfindung;

Fig. 6

Das Trennen von einigen Fäden gemäss einer dritten Ausführungsform der Erfindung;

Fig. 7

Eine Draufsicht auf eine Schicht von eingespannten Fäden sowie das Erfassen von einigen Fäden gemäss einer vierten Ausführungsform der Erfindung;

Fig. 8

Das Trennen von einigen Fäden gemäss einer vierten Ausführungsform der Erfindung;

Fig. 9

Eine räumliche Darstellung des Trennens von einzelnen Fäden, gemäss einer bevorzugten Variante der vierten Ausführungsform;

Fig. 10

Eine räumliche Darstellung des Trennens von einzelnen Fäden, gemäss einer Kombination der zweiten mit der dritten Ausführungsform.

In the following, the invention will be explained with reference to figures, which schematically illustrate various possible embodiments, but without restricting the scope of the invention in any way. Show it:

Fig. 1

A top view of a layer of clamped threads and the detection of some threads according to a first embodiment of the invention;

Fig. 2

The separation of some threads according to a first embodiment of the invention;

Fig. 3

A plan view of a layer of clamped threads and the detection of some threads according to a second embodiment of the invention;

Fig. 4

The separation of some threads according to a second embodiment of the invention;

Fig. 5

A plan view of a layer of clamped threads and the detection of some threads according to a third embodiment of the invention;

Fig. 6

The separation of some threads according to a third embodiment of the invention;

Fig. 7

A top view of a layer of clamped threads and the detection of some threads according to a fourth embodiment of the invention;

Fig. 8

The separation of some threads according to a fourth embodiment of the invention;

Fig. 9

A spatial representation of the separation of individual threads, according to a preferred variant of the fourth embodiment;

Fig. 10

A spatial representation of the separation of individual threads, according to a combination of the second and the third embodiment.

All figures have in common that they are several side by side lying threads 1 show that in a first place in a first element 2 and at a second point in a second Element 3 are clamped so that they together form an im form a substantially flat surface or layer 4. The Elements 2 and 3 are parts of a frame, for example, as it is is used in drawing machines.

Fig. 1 shows a first embodiment of the inventive Device, which as a first release agent 5 - to Detecting a plurality of threads 1 at at least one point S and to cause different relative accelerations of the detected threads in essentially their transverse direction - Includes two bars 6, 6 '. These bars are around one first, essentially perpendicular to the level of layer 4 standing axis 7 movably arranged. They are like each other can be arranged in such a way that the threads they have captured between can get caught. The position of the first release agent 5 for grasping some threads is shown here: The bars 6, 6 'are arranged essentially parallel to one another and extend in a direction that is clear from the right-angled to the direction of expansion of the threads 1 differs.

Fig. 2 shows the release agent 5, which is essentially here perpendicular to the original direction of expansion of the threads 1 is shown pivoted: The release agent 5 was around rotated the angle 8 between the dashed detection position and the separated separation position lies. The places S at which some threads 1 were detected still have essentially the same distance to the axis of rotation 7; because of the rotation by the angle 8 but the distance between the detected threads is essential got bigger. By swiveling the release agent 5, all of the detected threads essentially experienced acceleration in the transverse direction to their direction of expansion.

Fig. 3 shows a second embodiment of the invention Device which acts as a second release agent 15 for detecting multiple threads 1 at at least one point S each and to cause different relative accelerations of the detected threads in essentially their transverse direction - Includes three bars 16, 16 'and 16 ". These bars are around a first, substantially perpendicular to Level of the layer 4 standing axis 7 movably arranged. They can be arranged in relation to one another in such a way that they can be Threads are at least partially wrapped around. The position of the second release means 15 for grasping some threads is shown here: The bars 16, 16 'and 16' 'are in Arranged and extend substantially parallel to each other itself in a direction that is clearly different from the right angle deviates to the direction of expansion of the threads 1.

Fig. 4 shows the release agent 15, which is essentially here perpendicular to the original direction of expansion of the Threads 1 is shown pivoted: The release agent 15 was rotated by the angle 8 between the dashed detection position (shown only for bars 16 ') and the drawn separation position. The places S, on which some threads 1 have been detected, still point in Essentially the same distance from the axis of rotation 7; because of the rotation through the angle 8 is the distance of the detected Threads have become much larger among themselves. By the pivoting of the separating means 15 all experienced Accelerate essentially in the transverse direction their direction of expansion.

5 shows a third embodiment of the invention Device which acts as a third release agent 25 for detecting multiple threads 1 at at least one point S each and to cause different relative accelerations of the detected threads in essentially their transverse direction - Includes two elastic beams 26, 26 '. This Beams can be arranged so that they match those of them pinched threads between them. The position of the third release means 25 for grasping some threads is shown here: The bars 26, 26 'are essentially arranged parallel to each other and at least extend approximately at right angles to the direction of expansion of the Threads 1.

Fig. 6 shows the release agent 25, which also here in Essentially perpendicular to the original direction of expansion the threads 1 is shown: the release agent 25 but was stretched in the longitudinal direction (arrow). The jobs S, on which some threads 1 have been detected, now have one progressively increasing distance to the threads not recorded on. Learned by stretching the elastic beams 26, 26 ' all the threads captured are essentially accelerating in the transverse direction to their direction of expansion.

All or only some of the described bars 6, 6 '; 16, 16 ', 16' '; 26, 26 'can have a cross section, by a curved curve, e.g. Circle, ellipse or Oval, or that of a polygon such as Triangle, square, Rectangle, pentagon or polygon, is limited. So that a friction or positive locking between the bars 6, 6 '; 16, 16 ', 16' '; 26, 26 'and the detected threads, the Surface of all or even individual bars with one special material that increases friction, e.g. Rubber, or with appropriate surface shapes, e.g. Comb, be provided. The friction should preferably be in the longitudinal direction the bar 6, 6 '; 16, 16 ', 16 "; 26, 26' larger be than in their transverse direction. It goes without saying that there are many and very different possibilities, such Bars 6, 6 '; 16, 16 ', 16 "; 26, 26' and in to store and drive the above-mentioned directions. Such possibilities are known per se from other areas and therefore not shown here.

According to the described method or using the Devices described was captured by all threads the thread 9 that is farthest from the remaining threads 1 of layer 4 is the greatest distance from the unrecorded threads are carried away.

Fig. 7 shows a fourth embodiment of the inventive Device which acts as a fourth release agent 35 for detecting multiple threads 1 at at least one point S each and to cause different relative accelerations of the detected threads in essentially their transverse direction - one - at least approximately one to layer 4 parallel axis 36 - rotatable, screw or spiral Includes screw conveyor 37 with an increasing slope 38. This screw conveyor extends at least approximately perpendicular to the direction of expansion of the threads 1.

Fig. 8 shows the release agent 35, which also here in Essentially perpendicular to the original direction of expansion the threads 1 is shown: the release agent 35 but was rotated about axis 36. The places S where some threads 1 have been recorded, now show a progressive increasing distance to the threads not detected. By the rotation of the screw 37 experienced all detected threads acceleration essentially in the transverse direction their direction of expansion. Experience through the increasing slope the threads captured a different relative Acceleration. So now the thread 9 shows the furthest of the remaining threads 1 of layer 4 is opposite the second thread 10 a greater distance than separates this from the third thread 11.

9 shows a spatial representation of the separation of individual threads, according to a preferred variant of the fourth Embodiment: At 37 there is a rotatable screw conveyor denotes which - if this screw conveyor is essentially one has a cylindrical shape - a helical, or - if this screw conveyor is essentially one has a conical shape - has a spiral shape. It can also be provided that the beginning of the Screw conveyor conical and the rest cylindrical is. In contrast, a screw conveyor is particularly advantageous 37, which at least in the area in which e.g. a gripper or a needle takes over the first thread 9, a surface which is essentially parallel to the layer 4 lies because this separates the screw has the greatest impact. As can be seen, a Pusher 12 may be provided. This pusher is from one first side of the thread layer on some threads while the screw conveyor 37 against a second side of the thread layer 4 presses on some threads. The screw conveyor 37 is about an axis 36 in a manner known per se and therefore not here illustrated manner stored and driven. she has in particular a screw or spiral circumferential Groove or rib on, whose slope progressively 38 in Direction of the thread 9 to be divided increases. The screw conveyor 37 is preferably on the, the first thread 9 of the Thread layer opposite end 13 tapers. The pusher 12 is also movably mounted in the direction of an arrow 14 and driven in a manner known per se. Will be a second Conveyor screw 37 is provided, so can a second press 12 are arranged, preferably the two screw conveyors 37 arranged between the two pushers 12 become.

In deviation from Figures 7, 8 and 9 can be provided be that a screw conveyor 37 - to reinforce the Separating effect - between two neighboring screws - or Spiral courses has additional screw or spiral starts.

If it does not succeed, the threads in a single operation to separate so that e.g. a gripper or a needle first thread 9 takes over (perhaps because the threads 1 out particularly fine, untwisted fibrils can exist) any combination two of the same or different ones Release agents 5, 15, 25, 35 described above are used become. Thus, a release agent 5, 15, 25, 35 at least partially separated threads by another Release agent 5, 15, 25, 35 added and further separated become. Through a possibly continued, reciprocal Working with the selected release agents an excellent separation result is achieved.

10 shows a spatial representation of the separation of individual threads, according to a combination of the second with the third embodiment. There is a release agent 15 here from a group of dividing bars 16, 16 ', 16' ', all at least partially wrapped in some threads 29 to 32 will or deflect them and in the thread direction are arranged one behind the other. According to this figure can the two outer dividing beams 16, 16 "on the press the same side of the thread layer while the middle Separating bar 16 'rests on the other side of the thread layer. Of course, the dividing bars 16, 16 ', 16 '', different from what is shown in this description (Fig. 3, 4, 10), on the other side of the surface 4 be arranged. The separating bars 16, 16 ', 16' 'are from a first one, identified here by a line 33 Position in the shown, indicated by a second line 34 Position pivoted. You can see here also a gripper 39, which is part of a drawing machine.

Two elastic bars 26, 26 'are a further release agent. shown. These now capture the at least partially separated ones Threads 29 to 32 to them in a further separation step additionally separate from each other. If necessary can with the dividing bars 16, 16 ', 16' '- in one third step improves the separation result so that the gripper 39, the part of a drawing machine is, can grasp the first thread 29.

The mode of operation of the method according to the invention and the Device is as follows:

The starting point of the process is a thread layer or a Number of threads 1, which are clamped in places 2 and 3 and essentially form a surface or a layer 4. First some threads 1 as shown in Figs. 2, 4, 6 and 8, captured and essentially transverse to their direction of expansion deflected so that, for example, between the threads 29 and 30 give a distance that is larger is as the distance between the unmounted threads 1. By the grasping, but above all by the deflection, which preferably happening in the area can, if the threads 1 consist of so-called multifilaments, fibril triangles 40 (see FIG. 10) form. These arise because the threads lose their original cylindrical shape and pressed into flat structures.

The aim of the separation is that a first thread 9 or 29 e.g. can be taken over by a gripper 39 or a needle can. When the threads are not twisted, the appearance of the fibril triangles can occur 40 delay a successful separation, see above that in two or more steps - or as long as until the fibril triangles no longer overlap - separated must become.

Claims (17)

1. A device for the separation of individual threads from a layer (4), which consists of a plurality of threads (1) tensioned at at least two points (2, 3),
   characterised in that
   the device comprises separation means (5, 15, 25, 35) for the acquisition of several threads at at least one point (S) in each case, and to cause different relative accelerations of the acquired threads in essentially their transverse direction.
2. The device according to Claim 1, characterised in that the separation means (5, 15, 25, 35) are designed to acquire several threads by means of friction, positive connection, or a combination of the two.
3. The device according to Claim 1 or 2, characterised in that the separation means (5, 15, 25, 35) comprise a screw-shaped or helical-shaped worm conveyor (37) with an increasing pitch (38), capable of rotation about an axis (36) at least approximately parallel to the layer (4).
4. The device according to Claim 3, characterised in that the worm conveyor (37) features additional screw or helical beginnings between two adjacent screw or helical beginnings.
5. The device according to Claim 3 or 4, characterised in that, in addition, a presser (20) is provided in order to increase the pressure of the thread onto the screw or helical-shaped worm conveyor (37).
6. The device according to Claim 1 or 2, characterised in that the separation means (5, 15, 25, 35) comprise two clamping bars (6, 6') capable of movement about a first axis (7), essentially at right angles to the plane of the layer, which can be arranged in relation to one another in such a way that they clamp between them the threads they have acquired.
7. The device according to Claim 1 or 2, characterised in that the separation means (5, 15, 25, 35) comprise two elastic bars (26, 26') extending essentially perpendicular to the direction of extension of the threads, which can be arranged in relation to one another in such a way that they clamp between them the threads they have acquired.
8. The device according to Claim 1 or 2, characterised in that the separation means (5, 15, 25, 35) comprise three separation bars (16, 16', 16") capable of movement about an axis (7) located essentially at right angles to the plane of the layer, which can be arranged in relation to one another in such a way that they are looped around at least in part by the acquired threads.
9. The device according to Claim 6, 7, or 8, characterised in that clamping bars are additionally provided to secure the acquired and at least partially separated threads, in a fixed position or capable of being moved about an axis located essentially at right angles to the plane of the layer (4).
10. A method for the separation of individual threads from a layer (4), which consists of a plurality of threads (1), tensioned at at least two places (2, 3), characterised in that several threads are acquired by a separations means (5, 15, 25, 35) at at least one point (S), and the acquired threads are provided with different relative acceleration values in essentially their transverse direction.
11. The method according to Claim 10, characterised in that, with the separation means (5, 15, 25, 35) for the acquisition of several threads, a friction connection, positive connection, or a combination of the two is created.
12. The method according to Claim 10 or 11, characterised in that the acquired threads are separated on a screw-shaped or helical worm conveyor (37), capable of rotation about an axis (36) at least approximately parallel to the layer, said conveyor featuring an increasing pitch (38).
13. The method according to Claim 12, characterised in that an additional pressure is exerted by means of a presser (12) on the thread lying on the worm conveyor (37).
14. The method according to Claim 10 or 11, characterised in that the acquired threads are clamped between two clamping bars (6, 6'), which are capable of movement about a first axis (7) located essentially at right angles to the plane of the layer (4), whereupon the threads are at least in part separated by the pivoting of the bars (6, 6') about the first axis (7).
15. The method according to Claim 10 or 11, characterised in that the acquired threads are clamped between two elastic bars (26, 26'), which extend essentially perpendicular to the direction of extension of the threads, whereupon the threads are at least in part separated in their longitudinal direction by the rotation of the bars (26, 26').
16. The method according to Claim 10 or 11, characterised in that the acquired threads are held between three separation bars (16, 16', 16") which are capable of movement about an axis (7) located essentially at right angles to the plane of the layer (4), in that these bars (16, 16', 16") are looped about at least in part by the threads, whereupon the threads are at least in part separated by the pivoting of the bars about the first axis (7).
17. The method according to one or more of Claims 10 to 16, characterised in that at least two of the separation means (5, 15, 25, 35) are used alternately.

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