CA2336098A1 - Device and method for separating threads from a layer - Google Patents
Device and method for separating threads from a layer Download PDFInfo
- Publication number
- CA2336098A1 CA2336098A1 CA002336098A CA2336098A CA2336098A1 CA 2336098 A1 CA2336098 A1 CA 2336098A1 CA 002336098 A CA002336098 A CA 002336098A CA 2336098 A CA2336098 A CA 2336098A CA 2336098 A1 CA2336098 A1 CA 2336098A1
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- threads
- picked
- layer
- bars
- separation means
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- D—TEXTILES; PAPER
- D03—WEAVING
- D03J—AUXILIARY WEAVING APPARATUS; WEAVERS' TOOLS; SHUTTLES
- D03J1/00—Auxiliary apparatus combined with or associated with looms
- D03J1/16—Apparatus for joining warp ends
- D03J1/18—Apparatus for joining warp ends for joining, e.g. tying, a complete series of fresh warp threads to the used warp threads
-
- D—TEXTILES; PAPER
- D03—WEAVING
- D03J—AUXILIARY WEAVING APPARATUS; WEAVERS' TOOLS; SHUTTLES
- D03J1/00—Auxiliary apparatus combined with or associated with looms
- D03J1/14—Apparatus for threading warp stop-motion droppers, healds, or reeds
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- Engineering & Computer Science (AREA)
- Textile Engineering (AREA)
- Yarns And Mechanical Finishing Of Yarns Or Ropes (AREA)
- Warping, Beaming, Or Leasing (AREA)
- Nonwoven Fabrics (AREA)
- Investigating Materials By The Use Of Optical Means Adapted For Particular Applications (AREA)
- Electrical Discharge Machining, Electrochemical Machining, And Combined Machining (AREA)
- Combined Means For Separation Of Solids (AREA)
- Apparatus Associated With Microorganisms And Enzymes (AREA)
- Auxiliary Weaving Apparatuses, Weavers' Tools, And Shuttles (AREA)
- Removal Of Insulation Or Armoring From Wires Or Cables (AREA)
- Preliminary Treatment Of Fibers (AREA)
Abstract
The invention relates to a method and a device for separating adjacent threa ds 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 separatio n processes, the first thread can be easily grasped, e.g. by a drawing-in hook and then removed from the layer.
Description
Device and method for dividing off threads from a layer The invention relates to a device and a method for dividing off threads which lie next to one another and are clamped at a first and a second point and which together form essentially a surface or a layer.
Dividing off threads is a work step which has to be carried out, for example, in order to draw warp threads into the harness elements of a weaving machine. In this case, the warp threads are tentered in a frame, where together they form a warp-thread layer. At the same time, the individual threads lie very closely to one another. Before being drawn in, they are to be divided off from the layer, which means that they have to be separated from one another. However, this is not always simple. A problem also arises when warp threads of an old warp-thread layer, already provided with weft threads and thus forming part of a fabric, are knotted to a new warp-thread layer. Here too warp threads are clamped into a frame and have to be separated from the layer before being knotted by the knotting machine.
In known devices and methods for dividing off such threads, for example, needles are introduced between the individual threads, in order to delimit threads lying next to one another, so that they can subsequently be picked up individually for the drawing-in operation. Or a so-called lease is introduced beforehand between the threads, two cords transverse to the warp threads being drawn or woven in between the warp threads. For dividing-off purposes, it is then possible, for example, to pull alternately on one end or on both ends of the lease, with the result that the thread which is foremost in each case is separated from the others.
One disadvantage of such known methods and devices is, in particular, to be seen in that there are limits to the introduction of needles in the case of warp threads which consist of so-called multifilaments. This is true, in particular, when these multifilaments are non-twisted or have a low linear density or when the density of the thread layer is highly irregular. Even in the method using the lease, it is necessary, for inserting the cords, to divide off, for example, by hand or mechanically with needles, so that the problems just described likewise arise there. Although the warp threads are cleanly divided off and stored by the lease, the insertion of the separating cords means an additional and often highly complicated operation.
However, during weaving, or even when the warps are being knotted, uncleanly divided-off warp threads lead to interruptions and, consequently, to inadequate productivity. This occurs even when double-thread detection is provided, such as is employed, for example, in knotting machines.
From FR 698 064 or GB 2,117,419 respectively, further methods are known in which, without using a lease, the threads are divided off the thread layer solely by means of a rotary body which has a thread-like profile on the circumference. These methods are nevertheless suitable only for dividing off staple yarns or twisted multifilaments. In the case of non-twisted yarns consisting of a plurality of fibrils, the yarns are merely divided into the individual fibrils. It is therefore virtually no longer possible to ensure a clean division.
The object of the invention is to propose a method and a device, in particular for applying this method, by means of which threads can be divided off from a thread layer reliably, specifically even when the threads consist of so-called non-twisted multifilaments of fibrils.
Dividing off threads is a work step which has to be carried out, for example, in order to draw warp threads into the harness elements of a weaving machine. In this case, the warp threads are tentered in a frame, where together they form a warp-thread layer. At the same time, the individual threads lie very closely to one another. Before being drawn in, they are to be divided off from the layer, which means that they have to be separated from one another. However, this is not always simple. A problem also arises when warp threads of an old warp-thread layer, already provided with weft threads and thus forming part of a fabric, are knotted to a new warp-thread layer. Here too warp threads are clamped into a frame and have to be separated from the layer before being knotted by the knotting machine.
In known devices and methods for dividing off such threads, for example, needles are introduced between the individual threads, in order to delimit threads lying next to one another, so that they can subsequently be picked up individually for the drawing-in operation. Or a so-called lease is introduced beforehand between the threads, two cords transverse to the warp threads being drawn or woven in between the warp threads. For dividing-off purposes, it is then possible, for example, to pull alternately on one end or on both ends of the lease, with the result that the thread which is foremost in each case is separated from the others.
One disadvantage of such known methods and devices is, in particular, to be seen in that there are limits to the introduction of needles in the case of warp threads which consist of so-called multifilaments. This is true, in particular, when these multifilaments are non-twisted or have a low linear density or when the density of the thread layer is highly irregular. Even in the method using the lease, it is necessary, for inserting the cords, to divide off, for example, by hand or mechanically with needles, so that the problems just described likewise arise there. Although the warp threads are cleanly divided off and stored by the lease, the insertion of the separating cords means an additional and often highly complicated operation.
However, during weaving, or even when the warps are being knotted, uncleanly divided-off warp threads lead to interruptions and, consequently, to inadequate productivity. This occurs even when double-thread detection is provided, such as is employed, for example, in knotting machines.
From FR 698 064 or GB 2,117,419 respectively, further methods are known in which, without using a lease, the threads are divided off the thread layer solely by means of a rotary body which has a thread-like profile on the circumference. These methods are nevertheless suitable only for dividing off staple yarns or twisted multifilaments. In the case of non-twisted yarns consisting of a plurality of fibrils, the yarns are merely divided into the individual fibrils. It is therefore virtually no longer possible to ensure a clean division.
The object of the invention is to propose a method and a device, in particular for applying this method, by means of which threads can be divided off from a thread layer reliably, specifically even when the threads consist of so-called non-twisted multifilaments of fibrils.
The invention, as characterized by Claim 1, therefore achieves this object, according to a first aspect of the invention, according to which a device for dividing off individual threads from a layer, which consists of a multiplicity of threads clamped at at least two points, is proposed, which is characterized in that the device comprises a separation means for picking up a plurality of threads at at least one point in each case and for bringing about different relative accelerations of the picked-up threads essentially in their transverse direction.
According to a second aspect, the object is achieved in that, in Claim 12, a method for dividing off individual threads from a layer, which consists of a multiplicity of threads clamped at at least two points, is proposed, which is characterized in that, by a separation means, a plurality of threads are picked up at at least one point in each case and different relative accelerations are brought about in the picked-up threads essentially in their transverse direction.
Preferred embodiments of this invention may be gathered in each case from the dependent Claims 2 to 10 and 13 to 21.
According to the invention, by a separation means, a plurality of threads are picked up at at least one point in each case from a layer which consists of multiplicity of threads clamped at at least two points, that is to say, for example, from warp threads tentered in a frame, and different relative accelerations are brought about in the picked-up threads essentially in their transverse direction. This results in a progressive travel movement which is preferably greatest for the thread furthest removed from the warp-thread layer not picked up, so that the said thread, if the distance to the second thread already allows it, can be picked up from this new position, for example by a drawing-in needle, and be removed from the layer. Should a single acceleration of the picked-up threads essentially in their transverse direction not suffice, because the first thread is still located to near to the second, the picked-up and deflected threads may be picked up at a further point and subsequently be deflected once more. If the distance to the second thread allows it then, the first thread may then be picked up from this new position, for example by a drawing-in needle, and be removed from the layer.
Pick-up and deflection may take place alternately, until the first thread is at a sufficient distance from the second thread. In this case, of course, the picked-up threads are released, after they are to change their mutual position additionally as a result of a subsequent pick-up and deflection.
The device suitable for this purpose has, for picking up a plurality of threads from a layer, which consists of a multiplicity of threads clamped at at least two points, at least one separation means which preferably comprises:
1. One helical or spiral conveying worm with an increasing pitch, which is rotatable about a axis at least approximately parallel to the layer;
2. Two clamping bars which are moveable about a first axis essentially at right angles to the plane of the layer and which may be arranged relative to one another in such a way that they clamp between them the threads picked up by them;
3. Two elastic bars which extend essentially perpendicularly to the direction of extent of the threads and which may be arranged relative to one another in such a way that they clamp between them the threads picked up by them;
4. Three separating bars which are moveable about a first axis essentially at right angles to the plane of the layer and which may be arranged relative to one another in such a way that the threads are looped at least partially round them.
The advantages achieved thereby are to be seen, in particular, in that dividing off can now be carried out reliably, in a single step, for all possible types of threads, such as staple yarns, multifilaments of high or low fibre and with any number of twisted or non-twisted fibrils. This method may also be used for dividing off on drawing-in machines and knotting-machine stands. Moreover, at the same time, the thread is treated with great care.
Furthermore, each individually usable category of separation means, that is to say the pivotable or elastic clamping bars or the pivotable separating bars, may, as required, be assigned an additional separation means of the second to fourth category, in order to make it possible to pick up and deflect alternately, until the first thread is at a sufficient distance from the second thread. It has proved advantageous, moreover, to use, in addition to category 1, a so-called presser which increases the pressure of the threads on the helical or spiral conveying worm. Also, in order to reinforce the separating effect, a second conveying worm may be provided.
The invention is explained below with reference to figures which illustrate the various design possibilities diagrammatically, but without restricting the scope of the invention in any way. Of the figures:
Fig. 1 shows a top view of a layer of clamped threads and the pick-up of some threads according to a first embodiment of the invention;
Fig. 2 shows the separation of some threads according to a first embodiment of the invention;
Fig. 3 shows a top view of a layer of clamped threads and a pick-up of some threads according to a second embodiment of the invention;
Fig. 4 shows the separation of some threads according to a second embodiment of the invention;
Fig. 5 shows a top view of a layer of clamped threads and the pick-up of some threads according to a third embodiment of the invention;
Fig. 6 shows the separation of some threads according to a third embodiment of the invention;
Fig. 7 shows a top view of a layer of clamped threads and the pick-up of some threads according to a fourth embodiment of the invention;
Fig. 8 shows the separation of some threads according to a fourth embodiment of the invention;
Fig. 9 shows a three-dimensional illustration of the separation of individual threads according to a preferred variant of the fourth embodiment;
Fig. 10 shows a three-dimensional illustration of the separation of individual threads according to a combination of the second embodiment with the third.
All the figures have in common the fact that they show a plurality of threads 1 which lie next to one another and which are clamped at a first point in a first element 2 and at a second point in a second element 3, so that together they form an essentially plane surface or layer 4. The elements 2 and 3 are, for example, parts of a frame, such as is used in drawing-in machines.
Fig. 1 shows a first embodiment of the device according to the invention, which comprises two bars 6, 6' as a first separation means 5 for picking up a plurality of threads 1 at at least one point S in each case and for bringing about different relative accelerations of the picked-up threads essentially in their transverse direction. These bars are arranged so as to be moveable about a first axis 7 essentially at right angles to the plane of the layer 4. They may be arranged relative to one another in such a way that they can clamp between them the threads picked up by them. The position of the first separation means 5 for picking up some threads is illustrated here: the bars 6, 6' are arranged essentially parallel to one another and extend in a direction which deviates markedly from the right angle to the direction of extent of thread 1.
Fig. 2 shows the separation means 5 which, here, is illustrated as being pivoted essentially at right angles to the original direction of extent of the threads 1: the separation means 5 has been rotated through the angle 8 which is between the pick-up position represented by broken lines and the separation position represented by unbroken lines. The points S, at which some threads 1 have been picked up, are always at essentially the same distance from the axis of rotation 7; on account of rotation through the angle 8, however, the distance of the picked-up threads from one another has become substantially greater. Due to the pivoting of the separation means 5, all the picked-up threads have experienced acceleration essentially in the transverse direction to their direction of extent.
Fig. 3 shows a second embodiment of the device according to the invention, which comprises three bars 16, 16' and 16" as a second separation means 15 for picking up a plurality of threads 1 at at least one point S in each case and for bringing about different relative accelerations of the picked-up threads essentially in the transverse direction. These bars are arranged so as to be moveable about a first axis 7 essentially at right angles to the plane of the layer 4. They may be arranged relative to one another in such a way that the picked-up threads loop at least partially around them. The position of the second separation means 15 for picking up some threads is illustrated here: the bars 16, 16' and 16" are arranged essentially parallel to one another and extend in a direction which deviates markedly from the right angle to the direction of extent of the threads 1.
Fig. 4 shows the separation means 15 which, here, is illustrated as being pivoted essentially at right angles to the original direction of extent of the thread 1: the separation means 15 has been rotated through the angle 8 which is between the pick-up position represented by broken lines (illustrated only for the bar 16') and the separation position represented by unbroken lines. The points S, at which some threads 1 have been picked up, are always essentially at the same distance from the axis of rotation 7; on account of rotation through the angle 8, however, the distance of the picked-up threads from one another has become substantially greater. As a result of the pivoting of the separation means 15, all the picked-up threads have experienced acceleration essentially in the transverse direction to their direction of extent.
Fig. 5 shows a third embodiment of the device according to the invention, which comprises two elastic bars 26, 26' as a third separation means 25 for picking up a plurality of threads 1 at at least one point S in each case and for bringing about different relative accelerations of the picked-up threads essentially in _ g _ their transverse direction. These bars may be arranged relative to one another in such a way that they can clamp between them the threads picked up by them. The position of the third separation means 25 for picking up some threads is illustrated here: the bars 26, 26' are arranged essentially parallel to one another and extend at least approximately at right angles to the direction of extent of the threads 1.
Fig. 6 shows the separation means 25 which, here, is illustrated likewise essentially at right angles to the original direction of extent of the threads 1: however, the separation means 25 has been stretched in the longitudinal direction (arrow). The points S, at which some threads 1 have been picked up, are at a progressively increasing distance from the threads not picked up. As a result of the stretching of the elastic bars 26, 26', all the picked-up threads have experienced acceleration essentially in the transverse direction to their direction of extent.
The bars 6, 6' ; 16, 16' , 16" ; 26, 26' described may all or else only individually have a cross section which is delimited by an arcuate curve, such as, for example, a circle, ellipse or oval, or by a polygon, such as, for example, a triangle, square, rectangle, pentagon or polygon with more than five sides. So that a frictional or positive connection is made between the bars 6, 6' ; 16, 16' , 16" ; 26, 26' and the picked-up threads, the surface of all or else of only individual bars may be provided with a special friction-increasing material, such as, for example, rubber, or with corresponding surface shapes, such as, for example, combs. Preferably, friction is to be greater in the longitudinal direction of the bars 6, 6'; 16, 16', 16" ; 26, 26' than in their transverse direction. It goes without saying that there are many and various possibilities for designing such bars 6, 6'; 16, 16', 16" ; 26, 26' and for mounting them moveably in the directions mentioned and driving them. Such possibilities are known per se from other fields and are therefore not illustrated in any more detail here.
According to the method described or using the devices described, of all the picked-up threads the thread 9 located furthest away from the remaining threads 1 of the layer 4 has been conveyed the greatest distance from the threads not picked up.
Fig. 7 shows a fourth embodiment of the device according to the invention, which comprises a helical or spiral conveying worm 37 with an increasing pitch 38, rotatable about an axis 36 at least approximately parallel to the layer 4, as a fourth separation means 35 for picking up a plurality of threads 1 at at least one point S in each case and for bringing about different relative accelerations of the picked-up threads essentially in their transverse direction. This conveying worm extends at least approximately at right angles to the direction of extent of the threads 1.
Fig. 8 shows the separation means 35, which, here, is illustrated likewise essentially at right angles to the original direction of extent of the threads 1: however, the separation means 35 has been rotated about the axis 36. The points S, at which some threads 1 have been picked up, are at a progressively increasing distance from the threads not picked up. As a result of the rotation of the conveying worm 37, all the picked-up threads have experienced acceleration essentially in the transverse direction to their direction of extent.
By means of the increasing pitch, the picked-up threads experience different relative acceleration. Thus, the thread 9 located furthest away from the remaining threads 1 of the layer 4 is at a greater distance from the second thread 10 than separates the latter from the third thread 11.
-Fig. 9 shows a three-dimensional illustration of the separation of individual threads according to a preferred variant of the fourth embodiment: 37 designates a rotatable conveying worm which has a helical design, if this conveying worm is of essentially cylindrical shape, or a spiral design, if the said conveying worm is of essentially conical shape. There may also be provision for the start of the conveying worm to be designed conically and the rest cylindrically. By contrast, a conveying worm 37 is particularly advantageous which has, at least in the region in which, for example, a gripper or a needle takes over the first thread 9, a surface which is essentially parallel to the layer 4, because the separating effect of the conveying worm is thereby at its greatest. As may be seen, a presser 12 may be provided. This presser bears on some threads from a first side of the thread layer, whilst the conveying worm 37 presses on some threads against a second side of the thread layer 4. The conveying worm 37 is mounted and driven about an axis 36 in a way which is known per se and is therefore not illustrated here. It has, in particular, a helically or spirally peripheral groove or rib, the pitch 38 of which increases progressively in the direction of the thread 9 to be divided off. The conveying worm 37 is preferably tapered at the end 13 facing away from the first thread 9 of the thread layer. The presser 12 is mounted so as to be likewise moveable in the direction of an arrow 14 and is a driven in a way known per se. If a second conveying worm 37 is provided, a second presser 12 may also be arranged, preferably the two conveying worms 37 being arranged between the two pressers 12.
In contrast to Figures 7, 8 and 9, there may be provision for a conveying worm 37 to have additional helix or spiral starts between two adjacent helix or spiral flights in order to reinforce the separating effect.
If it is not possible to separate the threads in a single operation, in such a way that, for example', a gripper or a needle takes over the first thread 9 (perhaps because the threads 1 consist of particularly fine non-twisted fibrils), two identical or different above-described separation means 5, 15, 25, 35 may be used in any desired combination. Thus, threads at least partially separated by one separation means 5, 15, 25, 35 can be received and further separated by another separation means 5, 15, 25, 35. An outstanding separation result is achieved by alternately working, if appropriate in a protracted manner, with the separation means selected in each case.
Fig. 10 shows a three-dimensional illustration of the separation of individual threads according to a combination of the second embodiment with the third.
One separation means 15 consists, here, of a group of separating bars 16, 16', 16" , round of all of which some threads 29 to 32 are at least partially looped or which deflect these and which are arranged one behind the other in the thread direction. According to this figure, the two outer separating bars 16, 16" can press onto the same side of the thread layer, whilst the middle separating bar 16' bears on the other side of the thread layer. Of course, contrary to the illustrations in this description (Fig. 3, 4, 10), the separating bars 16, 16', 16" may be arranged in each case on the other side of the surface 4. The separating bars 16, 16', 16" are mounted so as to be pivotable out of a first position, characterized here by a line 33, into the position shown, characterized by a second line 34. A gripper 39, which is part of a drawing-in machine, can also be seen here.
Two elastic bars 26, 26' are illustrated as a further separation means. These pick up the at least partially separated threads 29 to 32, in order to separate them additionally from one another in a further separating step. If necessary, the separation result may be further improved in a third work step by means of the separating bars 16, 16' , 16" , so that the gripper 39, which is part of a drawing-in machine, can grip the first thread 29.
The method and device according to the invention operate as follows:
The starting point of the method is a thread layer or a number of threads 1 which are clamped at points 2 and 3 and form essentially a surface or a layer 4. First, as shown in Fig. 2, 4, 6 and 8, some threads 1 are picked up and deflected essentially transversely to their direction of extent, so as to result, for example, in a distance between the threads 29 and 30 which is greater than the distance between the threads 1 not picked up.
As a result of the pick-up, but, above all, as a result of deflection, which preferably takes place in the plane, if the threads 1 consist of so-called multifilaments fibril triangles 40 (cf. Fig. 10) may then be formed. These occur because the threads lose their original cylindrical shape and are pressed to form sheet-like structures.
The purpose of the separation is to ensure that a first thread 9 or 29 can be taken over, for example, by a gripper 39 or a needle. In the case of non-twisted threads, the occurrence of fibril triangles 40 may delay successful separation, so that separation has to be carried out in two or more work steps, or until the fibril triangles no longer overlap.
According to a second aspect, the object is achieved in that, in Claim 12, a method for dividing off individual threads from a layer, which consists of a multiplicity of threads clamped at at least two points, is proposed, which is characterized in that, by a separation means, a plurality of threads are picked up at at least one point in each case and different relative accelerations are brought about in the picked-up threads essentially in their transverse direction.
Preferred embodiments of this invention may be gathered in each case from the dependent Claims 2 to 10 and 13 to 21.
According to the invention, by a separation means, a plurality of threads are picked up at at least one point in each case from a layer which consists of multiplicity of threads clamped at at least two points, that is to say, for example, from warp threads tentered in a frame, and different relative accelerations are brought about in the picked-up threads essentially in their transverse direction. This results in a progressive travel movement which is preferably greatest for the thread furthest removed from the warp-thread layer not picked up, so that the said thread, if the distance to the second thread already allows it, can be picked up from this new position, for example by a drawing-in needle, and be removed from the layer. Should a single acceleration of the picked-up threads essentially in their transverse direction not suffice, because the first thread is still located to near to the second, the picked-up and deflected threads may be picked up at a further point and subsequently be deflected once more. If the distance to the second thread allows it then, the first thread may then be picked up from this new position, for example by a drawing-in needle, and be removed from the layer.
Pick-up and deflection may take place alternately, until the first thread is at a sufficient distance from the second thread. In this case, of course, the picked-up threads are released, after they are to change their mutual position additionally as a result of a subsequent pick-up and deflection.
The device suitable for this purpose has, for picking up a plurality of threads from a layer, which consists of a multiplicity of threads clamped at at least two points, at least one separation means which preferably comprises:
1. One helical or spiral conveying worm with an increasing pitch, which is rotatable about a axis at least approximately parallel to the layer;
2. Two clamping bars which are moveable about a first axis essentially at right angles to the plane of the layer and which may be arranged relative to one another in such a way that they clamp between them the threads picked up by them;
3. Two elastic bars which extend essentially perpendicularly to the direction of extent of the threads and which may be arranged relative to one another in such a way that they clamp between them the threads picked up by them;
4. Three separating bars which are moveable about a first axis essentially at right angles to the plane of the layer and which may be arranged relative to one another in such a way that the threads are looped at least partially round them.
The advantages achieved thereby are to be seen, in particular, in that dividing off can now be carried out reliably, in a single step, for all possible types of threads, such as staple yarns, multifilaments of high or low fibre and with any number of twisted or non-twisted fibrils. This method may also be used for dividing off on drawing-in machines and knotting-machine stands. Moreover, at the same time, the thread is treated with great care.
Furthermore, each individually usable category of separation means, that is to say the pivotable or elastic clamping bars or the pivotable separating bars, may, as required, be assigned an additional separation means of the second to fourth category, in order to make it possible to pick up and deflect alternately, until the first thread is at a sufficient distance from the second thread. It has proved advantageous, moreover, to use, in addition to category 1, a so-called presser which increases the pressure of the threads on the helical or spiral conveying worm. Also, in order to reinforce the separating effect, a second conveying worm may be provided.
The invention is explained below with reference to figures which illustrate the various design possibilities diagrammatically, but without restricting the scope of the invention in any way. Of the figures:
Fig. 1 shows a top view of a layer of clamped threads and the pick-up of some threads according to a first embodiment of the invention;
Fig. 2 shows the separation of some threads according to a first embodiment of the invention;
Fig. 3 shows a top view of a layer of clamped threads and a pick-up of some threads according to a second embodiment of the invention;
Fig. 4 shows the separation of some threads according to a second embodiment of the invention;
Fig. 5 shows a top view of a layer of clamped threads and the pick-up of some threads according to a third embodiment of the invention;
Fig. 6 shows the separation of some threads according to a third embodiment of the invention;
Fig. 7 shows a top view of a layer of clamped threads and the pick-up of some threads according to a fourth embodiment of the invention;
Fig. 8 shows the separation of some threads according to a fourth embodiment of the invention;
Fig. 9 shows a three-dimensional illustration of the separation of individual threads according to a preferred variant of the fourth embodiment;
Fig. 10 shows a three-dimensional illustration of the separation of individual threads according to a combination of the second embodiment with the third.
All the figures have in common the fact that they show a plurality of threads 1 which lie next to one another and which are clamped at a first point in a first element 2 and at a second point in a second element 3, so that together they form an essentially plane surface or layer 4. The elements 2 and 3 are, for example, parts of a frame, such as is used in drawing-in machines.
Fig. 1 shows a first embodiment of the device according to the invention, which comprises two bars 6, 6' as a first separation means 5 for picking up a plurality of threads 1 at at least one point S in each case and for bringing about different relative accelerations of the picked-up threads essentially in their transverse direction. These bars are arranged so as to be moveable about a first axis 7 essentially at right angles to the plane of the layer 4. They may be arranged relative to one another in such a way that they can clamp between them the threads picked up by them. The position of the first separation means 5 for picking up some threads is illustrated here: the bars 6, 6' are arranged essentially parallel to one another and extend in a direction which deviates markedly from the right angle to the direction of extent of thread 1.
Fig. 2 shows the separation means 5 which, here, is illustrated as being pivoted essentially at right angles to the original direction of extent of the threads 1: the separation means 5 has been rotated through the angle 8 which is between the pick-up position represented by broken lines and the separation position represented by unbroken lines. The points S, at which some threads 1 have been picked up, are always at essentially the same distance from the axis of rotation 7; on account of rotation through the angle 8, however, the distance of the picked-up threads from one another has become substantially greater. Due to the pivoting of the separation means 5, all the picked-up threads have experienced acceleration essentially in the transverse direction to their direction of extent.
Fig. 3 shows a second embodiment of the device according to the invention, which comprises three bars 16, 16' and 16" as a second separation means 15 for picking up a plurality of threads 1 at at least one point S in each case and for bringing about different relative accelerations of the picked-up threads essentially in the transverse direction. These bars are arranged so as to be moveable about a first axis 7 essentially at right angles to the plane of the layer 4. They may be arranged relative to one another in such a way that the picked-up threads loop at least partially around them. The position of the second separation means 15 for picking up some threads is illustrated here: the bars 16, 16' and 16" are arranged essentially parallel to one another and extend in a direction which deviates markedly from the right angle to the direction of extent of the threads 1.
Fig. 4 shows the separation means 15 which, here, is illustrated as being pivoted essentially at right angles to the original direction of extent of the thread 1: the separation means 15 has been rotated through the angle 8 which is between the pick-up position represented by broken lines (illustrated only for the bar 16') and the separation position represented by unbroken lines. The points S, at which some threads 1 have been picked up, are always essentially at the same distance from the axis of rotation 7; on account of rotation through the angle 8, however, the distance of the picked-up threads from one another has become substantially greater. As a result of the pivoting of the separation means 15, all the picked-up threads have experienced acceleration essentially in the transverse direction to their direction of extent.
Fig. 5 shows a third embodiment of the device according to the invention, which comprises two elastic bars 26, 26' as a third separation means 25 for picking up a plurality of threads 1 at at least one point S in each case and for bringing about different relative accelerations of the picked-up threads essentially in _ g _ their transverse direction. These bars may be arranged relative to one another in such a way that they can clamp between them the threads picked up by them. The position of the third separation means 25 for picking up some threads is illustrated here: the bars 26, 26' are arranged essentially parallel to one another and extend at least approximately at right angles to the direction of extent of the threads 1.
Fig. 6 shows the separation means 25 which, here, is illustrated likewise essentially at right angles to the original direction of extent of the threads 1: however, the separation means 25 has been stretched in the longitudinal direction (arrow). The points S, at which some threads 1 have been picked up, are at a progressively increasing distance from the threads not picked up. As a result of the stretching of the elastic bars 26, 26', all the picked-up threads have experienced acceleration essentially in the transverse direction to their direction of extent.
The bars 6, 6' ; 16, 16' , 16" ; 26, 26' described may all or else only individually have a cross section which is delimited by an arcuate curve, such as, for example, a circle, ellipse or oval, or by a polygon, such as, for example, a triangle, square, rectangle, pentagon or polygon with more than five sides. So that a frictional or positive connection is made between the bars 6, 6' ; 16, 16' , 16" ; 26, 26' and the picked-up threads, the surface of all or else of only individual bars may be provided with a special friction-increasing material, such as, for example, rubber, or with corresponding surface shapes, such as, for example, combs. Preferably, friction is to be greater in the longitudinal direction of the bars 6, 6'; 16, 16', 16" ; 26, 26' than in their transverse direction. It goes without saying that there are many and various possibilities for designing such bars 6, 6'; 16, 16', 16" ; 26, 26' and for mounting them moveably in the directions mentioned and driving them. Such possibilities are known per se from other fields and are therefore not illustrated in any more detail here.
According to the method described or using the devices described, of all the picked-up threads the thread 9 located furthest away from the remaining threads 1 of the layer 4 has been conveyed the greatest distance from the threads not picked up.
Fig. 7 shows a fourth embodiment of the device according to the invention, which comprises a helical or spiral conveying worm 37 with an increasing pitch 38, rotatable about an axis 36 at least approximately parallel to the layer 4, as a fourth separation means 35 for picking up a plurality of threads 1 at at least one point S in each case and for bringing about different relative accelerations of the picked-up threads essentially in their transverse direction. This conveying worm extends at least approximately at right angles to the direction of extent of the threads 1.
Fig. 8 shows the separation means 35, which, here, is illustrated likewise essentially at right angles to the original direction of extent of the threads 1: however, the separation means 35 has been rotated about the axis 36. The points S, at which some threads 1 have been picked up, are at a progressively increasing distance from the threads not picked up. As a result of the rotation of the conveying worm 37, all the picked-up threads have experienced acceleration essentially in the transverse direction to their direction of extent.
By means of the increasing pitch, the picked-up threads experience different relative acceleration. Thus, the thread 9 located furthest away from the remaining threads 1 of the layer 4 is at a greater distance from the second thread 10 than separates the latter from the third thread 11.
-Fig. 9 shows a three-dimensional illustration of the separation of individual threads according to a preferred variant of the fourth embodiment: 37 designates a rotatable conveying worm which has a helical design, if this conveying worm is of essentially cylindrical shape, or a spiral design, if the said conveying worm is of essentially conical shape. There may also be provision for the start of the conveying worm to be designed conically and the rest cylindrically. By contrast, a conveying worm 37 is particularly advantageous which has, at least in the region in which, for example, a gripper or a needle takes over the first thread 9, a surface which is essentially parallel to the layer 4, because the separating effect of the conveying worm is thereby at its greatest. As may be seen, a presser 12 may be provided. This presser bears on some threads from a first side of the thread layer, whilst the conveying worm 37 presses on some threads against a second side of the thread layer 4. The conveying worm 37 is mounted and driven about an axis 36 in a way which is known per se and is therefore not illustrated here. It has, in particular, a helically or spirally peripheral groove or rib, the pitch 38 of which increases progressively in the direction of the thread 9 to be divided off. The conveying worm 37 is preferably tapered at the end 13 facing away from the first thread 9 of the thread layer. The presser 12 is mounted so as to be likewise moveable in the direction of an arrow 14 and is a driven in a way known per se. If a second conveying worm 37 is provided, a second presser 12 may also be arranged, preferably the two conveying worms 37 being arranged between the two pressers 12.
In contrast to Figures 7, 8 and 9, there may be provision for a conveying worm 37 to have additional helix or spiral starts between two adjacent helix or spiral flights in order to reinforce the separating effect.
If it is not possible to separate the threads in a single operation, in such a way that, for example', a gripper or a needle takes over the first thread 9 (perhaps because the threads 1 consist of particularly fine non-twisted fibrils), two identical or different above-described separation means 5, 15, 25, 35 may be used in any desired combination. Thus, threads at least partially separated by one separation means 5, 15, 25, 35 can be received and further separated by another separation means 5, 15, 25, 35. An outstanding separation result is achieved by alternately working, if appropriate in a protracted manner, with the separation means selected in each case.
Fig. 10 shows a three-dimensional illustration of the separation of individual threads according to a combination of the second embodiment with the third.
One separation means 15 consists, here, of a group of separating bars 16, 16', 16" , round of all of which some threads 29 to 32 are at least partially looped or which deflect these and which are arranged one behind the other in the thread direction. According to this figure, the two outer separating bars 16, 16" can press onto the same side of the thread layer, whilst the middle separating bar 16' bears on the other side of the thread layer. Of course, contrary to the illustrations in this description (Fig. 3, 4, 10), the separating bars 16, 16', 16" may be arranged in each case on the other side of the surface 4. The separating bars 16, 16', 16" are mounted so as to be pivotable out of a first position, characterized here by a line 33, into the position shown, characterized by a second line 34. A gripper 39, which is part of a drawing-in machine, can also be seen here.
Two elastic bars 26, 26' are illustrated as a further separation means. These pick up the at least partially separated threads 29 to 32, in order to separate them additionally from one another in a further separating step. If necessary, the separation result may be further improved in a third work step by means of the separating bars 16, 16' , 16" , so that the gripper 39, which is part of a drawing-in machine, can grip the first thread 29.
The method and device according to the invention operate as follows:
The starting point of the method is a thread layer or a number of threads 1 which are clamped at points 2 and 3 and form essentially a surface or a layer 4. First, as shown in Fig. 2, 4, 6 and 8, some threads 1 are picked up and deflected essentially transversely to their direction of extent, so as to result, for example, in a distance between the threads 29 and 30 which is greater than the distance between the threads 1 not picked up.
As a result of the pick-up, but, above all, as a result of deflection, which preferably takes place in the plane, if the threads 1 consist of so-called multifilaments fibril triangles 40 (cf. Fig. 10) may then be formed. These occur because the threads lose their original cylindrical shape and are pressed to form sheet-like structures.
The purpose of the separation is to ensure that a first thread 9 or 29 can be taken over, for example, by a gripper 39 or a needle. In the case of non-twisted threads, the occurrence of fibril triangles 40 may delay successful separation, so that separation has to be carried out in two or more work steps, or until the fibril triangles no longer overlap.
Claims (17)
1. Device for dividing off individual threads from a layer (4) which consists of a multiplicity of threads (1) clamped at at least two points (2, 3), characterized in that the device comprises a separation means (5, 15, 25, 35) for picking up a plurality of threads at at least one point (S) in each case and for bringing about different relative accelerations of the picked-up threads essentially in their transverse direction.
2. Device according to Claim 1, characterized in that the separation means (5, 15, 25, 35) is designed for picking up a plurality of threads by means of frictional connection, positive connection or a combination of both of these.
3. Device according to Claim 1 or 2, characterized in that the separation means (5, 15, 25, 35) comprises a helical or spiral conveying worm (37) with an increasing pitch (38) which is rotatable about an axis (36) at least approximately parallel to the layer (4).
4. Device according to Claim 3, characterized in that the conveying worm (37) has additional helix or spiral starts between two adjacent helix or spiral flights.
5. Device according to Claim 3 or 4, characterized in that a presser (20) is additionally provided for increasing the pressure of the threads on the helical or spiral conveying worm (37).
6. Device according to Claim 1 or 2, characterized in that the separation means (5, 15, 25, 35) comprises two clamping bars (6, 6') which are moveable about a first axis (7) located essentially at right angles to the plane of the layer and which may be arranged relative to one another in such a way that they clamp between them the threads picked up by them.
7. Device according to Claim 1 or 2, characterized in that the separation means (5, 15, 25, 35) comprises two elastic bars (26, 26') which extend essentially perpendicularly to the direction of extent of the threads and which may be arranged relative to one another in such a way that they clamp between them the threads picked up by them.
8. Device according to Claim 1 or 2, characterized in that the separation means (5, 15, 25, 35) comprises three separating bars (16, 16', 16" ) which are moveable about a first axis (7) located essentially at right angles to the plane of the layer and which may be arranged relative to one another in such a way that the picked-up threads are looped at least partially round them.
9. Device according to Claim 6, 7 or 8, characterized in that, furthermore, fixed clamping bars or clamping bars moveable about a second axis located essentially at right angles to the plane of the layer (4) are provided for retaining the picked-up and at least partially divided-off threads.
10. Method for dividing off individual threads from a layer (4) which consists of a multiplicity of threads (1) clamped at at least two points (2, 3), characterized in that, by a separation means (5, 15, 25, 35), a plurality of threads are picked up at at least one point (S) in each case and different relative accelerations are brought about in the picked-up threads essentially in their transverse direction.
11. Method according to Claim 10, characterized in that a frictional connection, positive connection or a combination of both of these is made by the separation means (5, 15, 25, 35) for picking up a plurality of threads.
12. Method according to Claim 10 or 11, characterized in that the picked-up threads are separated on a helical or spiral conveying worm (37) which is rotatable about an axis (36) at least approximately parallel to the layer and which has an increasing pitch (38).
13. Method according to Claim 12, characterized in that additional pressure is exerted by means of a presser (12) on the threads resting on the conveying worm (37).
14. Method according to Claim 10 or 11, characterized in that the picked-up threads are clamped between two clamping bars (6, 6') which are moveable about a first axis (7) located essentially at right angles to the plane of the layer (4), whereupon the threads are at least partially separated as a result of the pivoting of the bars (6, 6') about the first axis (7).
15. Method according to Claim 10 or 11, characterized in that the picked-up threads are clamped between two elastic bars (26, 26') which extend essentially perpendicularly to the direction of extent of the threads, whereupon the threads are at least partially separated as a result of the stretching of the bars (26, 26') in their longitudinal direction.
16. Method according to Claim 10 or 11, characterized in that the picked-up threads are held between three separating bars (16, 16', 16" ) which are moveable about a first axis (7) located essentially at right angles to the plane of the layer (4), in that the threads are looped at least partially around these bars (16, 16', 16"), whereupon the threads are at least partially separated as a result of the pivoting of the bars about the first axis (7).
17. Method according to one or more of Claims 10 to 16, characterized in that at least two of the separation means (5, 15, 25, 35) are used alternately.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CH137798 | 1998-06-29 | ||
| CH1377/98 | 1998-06-29 | ||
| PCT/CH1999/000252 WO2000000687A1 (en) | 1998-06-29 | 1999-06-10 | Device and method for separating threads from a layer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2336098A1 true CA2336098A1 (en) | 2000-01-06 |
Family
ID=4209008
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002336098A Abandoned CA2336098A1 (en) | 1998-06-29 | 1999-06-10 | Device and method for separating threads from a layer |
Country Status (10)
| Country | Link |
|---|---|
| EP (1) | EP1092053B8 (en) |
| JP (1) | JP2002519531A (en) |
| KR (1) | KR20010071630A (en) |
| CN (1) | CN1094532C (en) |
| AT (1) | ATE233336T1 (en) |
| AU (1) | AU4028599A (en) |
| CA (1) | CA2336098A1 (en) |
| DE (1) | DE59904381D1 (en) |
| TR (1) | TR200003798T2 (en) |
| WO (1) | WO2000000687A1 (en) |
Families Citing this family (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| ATE334241T1 (en) * | 2001-04-25 | 2006-08-15 | Staeubli Ag Pfaeffikon | DEVICE AND METHOD FOR SEPARATING THREADS FROM A LAYER OF THREAD |
| WO2002101132A1 (en) * | 2001-06-12 | 2002-12-19 | Stäubli Ag Pfäffikon | Method and device for tensioning a warp thread |
| SE520453C2 (en) | 2001-11-01 | 2003-07-15 | Alfa Laval Corp Ab | An apparatus for simultaneously purifying a liquid and a gas |
| PT2881506T (en) * | 2013-12-09 | 2016-11-08 | Stäubli Sargans Ag | Apparatus for separation of threads |
| CN105671724B (en) * | 2016-04-13 | 2017-09-29 | 常州信息职业技术学院 | A kind of solution of warp thread twists device |
| CN106087232A (en) * | 2016-07-21 | 2016-11-09 | 苏州科润织造有限公司 | A kind of spiral shed stick |
| EP3330418B1 (en) * | 2016-12-01 | 2019-06-26 | Stäubli Sargans AG | Yarn separating module with a capacitive sensor device |
| CN108866773A (en) * | 2018-08-03 | 2018-11-23 | 江苏罗曼罗兰集团有限公司 | It can be reduced the tying-in technique that tying-in twists head |
| EP3771758B1 (en) * | 2019-07-31 | 2022-03-30 | Stäubli Sargans AG | Yarn-clamping device and weaving preparation machine including such a yarn-clamping device |
| CN110318145B (en) * | 2019-07-31 | 2024-02-23 | 宏和电子材料科技股份有限公司 | Electronic grade glass fiber cloth sizing silk taking device |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR698064A (en) * | 1930-06-25 | 1931-01-27 | Moore And Avery Blackburn Ltd | Improvements to apparatus for selecting and separating warp threads in the preparation of warp usable in looms |
| CH331810A (en) * | 1953-08-12 | 1958-08-15 | Koefoed Hauber Marstrand Og He | Cross bar for cross-laying the threads of a thread layer |
| DE3210920C1 (en) * | 1982-03-25 | 1983-09-29 | Lindauer Dornier Gmbh, 8990 Lindau | Device for separating and providing warp threads for pulling the warp threads into healds and slats |
-
1999
- 1999-06-10 CN CN99807979A patent/CN1094532C/en not_active Expired - Fee Related
- 1999-06-10 AU AU40285/99A patent/AU4028599A/en not_active Abandoned
- 1999-06-10 WO PCT/CH1999/000252 patent/WO2000000687A1/en not_active Application Discontinuation
- 1999-06-10 AT AT99923363T patent/ATE233336T1/en not_active IP Right Cessation
- 1999-06-10 CA CA002336098A patent/CA2336098A1/en not_active Abandoned
- 1999-06-10 EP EP99923363A patent/EP1092053B8/en not_active Expired - Lifetime
- 1999-06-10 DE DE59904381T patent/DE59904381D1/en not_active Expired - Lifetime
- 1999-06-10 TR TR2000/03798T patent/TR200003798T2/en unknown
- 1999-06-10 KR KR1020007014886A patent/KR20010071630A/en not_active Application Discontinuation
- 1999-06-10 JP JP2000557034A patent/JP2002519531A/en active Pending
Also Published As
| Publication number | Publication date |
|---|---|
| ATE233336T1 (en) | 2003-03-15 |
| DE59904381D1 (en) | 2003-04-03 |
| CN1094532C (en) | 2002-11-20 |
| CN1307655A (en) | 2001-08-08 |
| EP1092053B1 (en) | 2003-02-26 |
| JP2002519531A (en) | 2002-07-02 |
| EP1092053B8 (en) | 2003-06-25 |
| AU4028599A (en) | 2000-01-17 |
| KR20010071630A (en) | 2001-07-28 |
| WO2000000687A1 (en) | 2000-01-06 |
| TR200003798T2 (en) | 2001-07-23 |
| EP1092053A1 (en) | 2001-04-18 |
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Legal Events
| Date | Code | Title | Description |
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| FZDE | Discontinued |