EP2302116B1 - Method for creating a sample warp and sample warper - Google Patents

Abstract

The method involves placing threads (11) on transport surfaces (5) by a thread eyelet (15), where the transport surfaces are arranged at a periphery of a warping drum (2) and are movable axially parallel to the warping drum. The thread eyelet and the transport surfaces are moved relative to each other during placing of the threads. A parameter of a thread application (17) on the transport surfaces is determined. Relative movement between the thread eyelet and the transport surfaces is controlled based on the determined parameter. An independent claim is also included for a sample warpper comprising a measurement device.

Description

The invention relates to a method for producing a pattern chain, in which one stores threads using thread guides on conveyor belts which are arranged on the circumference of a warping drum, seen from the front side of the warping drum form a polygon and are axially parallel to the warping drum movable, and a thread application produced, wherein the yarn guide and the conveyor belts during deposition moves relative to each other.

Furthermore, the invention relates to a sample warping machine with a warping drum, at the periphery of which a plurality of parallel to the axis of the warping drum movable conveyor belts are arranged, which form seen from the front side of the warping drum form a polygon, and a plurality of yarn guides, with the help of threads on the conveyor belts to form a Thread order can be stored, the thread guide and the conveyor belts are parallel to the axis of the warping drum relative to each other movable.

Such a method and such a sample warper are for example EP 1 479 804 A2 known. Other sample warping machines are out EP 1 930 489 A1 and DE 44 46 279 C1 known.

Another such method and another such sample warper are, for example EP 1 445 361 A2 known.

A pattern chain, which can also be referred to as a "short chain", is produced by winding one or more threads simultaneously from one end face of the warping drum around the circumference of the warping drum and thereby onto transport surfaces, which are designed, for example, as endless, circulating conveyor belts drops. When the one or more co-wound yarns having the required number of turns are wound onto the warper drum, the transport surfaces move away from the end face to make room for the subsequent yarns.

When winding the threads on the warping drum you can not arrange the individual turns in the radial direction one above the other. In this case, there is a risk that the threads fall down on the free end side and are wound by subsequent turns. This results in later rebuilding, i. when unwinding the warp from the warping drum, there are significant difficulties that can result in the tearing of the yarns.

Therefore, during the winding of the threads on the warping drum, a thread application is produced with a conical end face. The slope of this end face is chosen so that a slipping down of the threads is no longer to be feared. To this cone-shaped end face too produce, you have to move the yarn guide and the transport surfaces during winding relative to each other. Especially then, if you wound several threads simultaneously on the warping drum, so called "ribbon" generated, it is for the subsequent unwinding of some importance that the bands form a thread order with a peripheral surface that runs as closely as possible parallel to the axis of the warping drum. If this condition is not met, later a chain can result in which individual threads have very different tensions. Such a chain is later difficult to process, for example in a weaving or knitting.

Another type of warping machines, called cone chillers, is out EP 1 460 156 A2 known. Here, a cylindrical warping drum is provided which has a cone-shaped end portion. Several threads are drawn parallel to each other and at the same time from a stationary gate and wound around the circumference of the warping drum by the warping drum rotates. The threads are passed through a reed with a plurality of lanes, whereby a single thread can be passed through each lane. The reed is displaced parallel to the axis of the warping drum towards the cone as the warping drum rotates. A measuring device, which is connected to the drive for the Riet, determines the parallelism of the surface of the forming coil.

DE 43 04 956 A1 shows a similar cone warping machine in which characteristics are recorded in the production of a first coil, which characterize the shape of the coil. When skinning subsequent reels are respectively recorded at the same number of revolutions of the warping drum, the characteristics and compared with the characteristics of the first coil. If there is a deviation, the thread tension of the fed sequential tape is corrected.

Another cone warmer is out JP 08-013278 A known. Here, a reed guiding the threads is moved in response to measurement signals from a thickness sensor.

The invention has for its object to produce a pattern chain with high quality.

This object is achieved in a method of the type mentioned above by determining at least one parameter of the thread application on at least one conveyor belt and controls the relative movement between the thread guides and the conveyor belts in dependence on the determined parameter, wherein as a parameter the height of the thread order and / or the parallelism of the surface of the thread application with the axis of the warping drum and / or the slope of the free end face of the thread application used.

It controls so in which way the threads are stored on the warping drum, and controls depending on whether the thread order desired specifications or not, the relative movement between the thread guides and the conveyor belts. This makes it possible, to a greater extent than previously possible, to influence the structure of the thread application, in such a way that the so on the circumference of the warping drum generated pattern chain can be deducted later easier and with higher quality. In many cases it will be sufficient to use one of the parameters. In certain cases, however, it may be beneficial to use two or three of these quantities as parameters. For example, if one notes that the surface of the thread application is no longer parallel to the axis of the warping drum, then one must control the relative movement between the conveyor belts and the thread guides so that the thread guides are moved less far over the conveyor belts, if a slope to the end the warping drum out, which is facing away from the yarn guides, or you have to control the yarn guide and the conveyor belts relative to each other in a larger coverage when there is a reverse slope of the peripheral surface of the thread order. Another possibility is to control the slope of the free end face. If this slope is "correct", then it can generally be assumed that the structure of the thread application also meets the specifications. From the determination of the height of the thread application at successive times, one can determine the increment of the thread application and control the relative movement according to the increment.

It is preferred that at least one of the following subassemblies is controlled in order to generate the relative movement: thread guide, laying unit, on which the thread guides are movably arranged, conveyor belts and warping drum. You can also move several of these modules controlled simultaneously to achieve the desired structure of the thread order. In principle, however, it is sufficient to move one of these assemblies in order to produce the thread application with a conically bevelled end face and an axis-parallel peripheral surface.

Preferably, the warping drum is rotated when depositing the threads and limits the determination of the parameter to predetermined rotational positions of the warping drum. If you limit the determination of the parameter on the rotational positions of the warping drum, in which a conveyor belt is below a measuring device, then you can determine the parameter exactly on the conveyor belts. This is sufficient in most cases to gain enough information about the structure of the thread order, so that you can control the relative movements in a row.

If you create the thread order through a sequence of juxtaposed ribbon, it is convenient to determine the parameter only at the first ribbon and to use a function used in the first band of relative movement in all subsequent ribbon. In a pattern warping machine, one can not create a pattern chain by simultaneously winding all the threads contained in the warp side by side. On the contrary, it is always possible to wrap only one group of threads at a time. These Threads wound simultaneously next to each other are also referred to as "ribbons". In particular, if all bands are constructed identically, it may be sufficient to determine the relative movements between the thread guides and the conveyor belts only for the first ribbon by monitoring the parameter and used as a controlled variable. You can then store the course of this relative movement in a memory and use for the construction of subsequent bands. Of course, you can also make a check during the wrapping of subsequent ribbons. However, a corresponding control of the relative movement as a function of the currently measured parameters is often no longer necessary. This saves processing power and allows a uniform overall structure of the chain.

Preferably, conveyor belts are used, to which a wedge-shaped contact surface with a predetermined pitch angle is assigned at one end of a working area. This pitch angle corresponds to the slope of the cone at the other axial end of the thread application. From the beginning, one then obtains the desired structure of the thread application, i. the determination of the parameters for controlling the relative movements between the yarn guides and the conveyor belts can be done from the first turn on.

The object is achieved in a sample warping machine of the type mentioned above in that a measuring device is provided which has at least one parameter of the thread application on at least one conveyor belt determined and which is connected to a drive control, which controls the relative movement between the yarn guides and the conveyor belts in dependence on the determined parameter, the measuring device determines at least one of the following parameters: height of the thread order, parallelism of the surface of the thread application with the axis of the warping drum and slope of the free end of the thread application. As explained above in connection with the method, it is possible with the aid of the measuring device to determine one or more parameters of the thread application and thus to determine whether the thread application is produced in the desired manner. If this is not the case, then the relative movement between the thread guides and the conveyor belts is changed. Such relative movement is usually present during winding to produce the cone-like structure at an end face of the thread application. If the thread application does not meet the desired specifications, then the relative movement is made larger or smaller. For example, if the surface of the thread application is not parallel to the axis of the warping drum, then the relative movement between the thread guides and the conveyor belts is too large or too small and must be corrected accordingly. The same applies if the slope of the free end of the thread order does not meet the desired specification.

Preferably, the conveyor belts at one end of a work area is assigned a wedge-shaped contact surface with a predetermined pitch angle. This pitch angle corresponds to the cone angle at the other end of the thread application. The abutment surface may be arranged on a wedge-shaped element which is fastened directly to the respective conveyor belt. But it is also possible to arrange the wedge-shaped contact surface on a separate movable from the conveyor belts device and then move this device together when creating the thread application with the conveyor belts.

Preferably, at least one of the following subassemblies is movable to produce the relative movement: thread guide, laying unit, on which the thread guides are movably arranged, conveyor belts and warping drum. You can also move several of these assemblies at the same time. However, the control is simplified if only one of these modules is moved at the same time. You can then use the mobility of the other modules for other functions.

Preferably, the measuring device is designed as a laser measuring device. A laser measuring device can be used here as a distance measuring device to determine the height of the thread application, the parallelism of the surface at the periphery of the thread application with the axis of the warping drum and / or the slope of the free end of the thread application. A laser measuring device has a relatively high resolution or accuracy of 30 μm. This is sufficient for most of the commonly used threads.

Preferably, the warping drum on a rotary drive and an angle sensor, wherein the angle encoder is connected to the measuring device. The angle encoder thus "clocks" the measuring device, ie it tells the measuring device, when the warping drum in Rotation angle positions is where a parameter can be determined. A measuring device that detects a distance to a fixed point would then continuously determine other measured values as the warping drum rotates. Of course you can also correct these changing measured values or move the measuring device accordingly. It is easier, however, if one makes a measurement only at predetermined circumferential points of the warping drum.

Preferably, the measuring device is displaceable parallel to the axis of the warping drum. You can then control wider bands, for example, include 24 or 48 adjacent threads. The measuring device can then be moved periodically back and forth, for example, to monitor the structure of the thread application.

Preferably, a memory device is provided, in which a relative movement function can be stored, wherein the memory device is connected to the drive control. As explained above in connection with the method, it is sufficient in many cases to record the function of the relative movements, ie the time profile of the relative movement, in the first wound ribbon and then to use it for all subsequent bands. This then results in a thread application with a very high uniformity. About that In addition, with this approach, it is possible to smooth the function of the relative movement, so that the one or more drives, which cause the relative movement, can work more uniformly. As a result, an increased heat development is avoided.

einzige Figur:

eine schematische Darstellung zur Er- läuterung der Erzeugung einer Muster- kette.

The invention will be described below with reference to a preferred embodiment in conjunction with the drawings. Herein shows the

only figure

a schematic representation for the explanation of the generation of a pattern chain.

The figure shows a very schematic representation of a sample warping machine 1 with a warping drum 2, which has a rotary drive 3. With the aid of the rotary drive 3, the warping drum 2 is rotated in the direction of an arrow 4 when generating a pattern chain.

At the periphery of the warping drum 2 a plurality of conveyor belts 5 are arranged, which are movable in the direction of an arrow 6 by a drive, not shown. The conveyor belts 5 thus form transport surfaces which are movable parallel to the axis 7 of the warping drum 2, namely when generating the pattern chain from a free end 8 to the end 9, on which the rotary drive is arranged.

Each conveyor belt 5 is assigned a wedge-shaped contact surface 10. In the simplest case, the wedge-shaped bearing surface 10 is attached directly to the conveyor belt 5 and is characterized together with the conveyor belt. 5 emotional. But you can also arrange the contact surfaces 10 separately from the conveyor belts 5 and move in other ways together with the conveyor belts 5.

At the beginning of a warping operation, the abutment surfaces 10 are located adjacent the free end 8, i. the conveyor belts 5 have been moved accordingly before the beginning of the winding.

To generate a pattern chain threads 11 are withdrawn from a gate 12 shown schematically. In the gate 12 more coils 13 are arranged for this purpose, and that is usually one for each thread eleventh

The threads 11 are guided by a laying unit 14. In the laying unit 14, a schematically illustrated thread guide 15 is provided for each thread. Each yarn guide 15 may be movable parallel to the axis 7 of the warping drum 2 relative to the laying unit 14. As indicated by an arrow 16, the laying unit 14 may be movable in total parallel to the axis 7 of the warping drum 2.

The conveyor belts 5 are also movable and driven. They are moved so that their outer surface, i. the radially outer strand moves from the free end 8 to the other end 9. Finally, it is also provided that the warping drum 2 is displaceable in total parallel to its axis 7.

As shown schematically in the figure, finally, a thread application 17 is to be generated, which has a cone-shaped end face 18 whose inclination the slope of the contact surface 10 matches. In this case, an outer circumferential surface 19 of the thread application 17 is arranged parallel to the axis 7 of the warping drum 2.

In the past, this has been realized by, for example, having the thread guides 15 for each turn, for example, three times the thread diameter or more. However, this does not immediately ensure that you can also achieve the appropriate structure of the thread application 17 and thus the coil of the pattern chain.

It now uses a measuring device 20, which is designed for example as a laser measuring device. The measuring device 20 is parallel to the axis of the warping drum 2 displaced, as indicated by the double arrow 21.

The measuring device 20 determines a distance between the peripheral surface 19 of the thread application 17 and a fixed point. With the aid of the measuring device 20, it is thus possible to determine the layer thickness increase of the thread application 17. With this layer thickness increase, which results from a sequence of measurements of the thickness or the height of the thread application, one can determine the size of the relative movement between the thread guides 15 and the conveyor belts 5, which is necessary for the just-wound ribbon, so the entirety of the simultaneously wound threads 11, the angle of the contact surface 10 follows.

Although this angle can be calculated in advance. Such a determination is advantageously taken even before the beginning of the warping process, so that the first or a few turns at the beginning of the warping process with these calculated values of the "feed", ie the relative movement between the yarn guides 15 and the conveyor belts 5, is driven. Now, it is determined with the aid of the measuring device 20, whether the set feed causes the individual turns of the ribbon so superimposed that their "front", ie the rotary drive 3 side facing abuts the contact surface 10 and thus on the other end side 18 of the desired cone angle results. If this is the case, then you can continue working with the set relative movement. If this is not the case then the relative movement has to be changed. To simplify the following explanation, the relative movement is referred to as "feed". So if the cone angle at the end face 18 of the thread application 17 is too steep, then the feed must be increased. If it is too flat, then the feed must be reduced.

Alternatively or additionally, it can also be determined with the aid of the measuring device 20 whether the circumferential surface 19 of the thread application runs parallel to the axis 7 of the warping drum 2. If one notes that the peripheral surface 19 has a slope towards the end 9, then the feed must be reduced. If a slope is towards the end 9, then the feed must be increased.

Another possibility is to monitor the inclination of the end face 18. If this inclination deviates from the inclination of the contact surface 10, then so is Here a corresponding correction of the feed required.

The relative movement can be generated in various ways. In the simplest case, only one assembly is ever moved. The other assemblies are held stationary in the direction of the axis 7 of the warping drum 2.

For example, you can move the thread guides 15 to create the cone-like structure of the thread application. You can set the thread guide 15 relative to the laying unit 14 and move the laying unit 14 accordingly. You can hold the thread guide 15 and the laying unit 14 and move the conveyor belts 5 or you can hold the thread guide 15 and the laying unit 14, hold the conveyor belts 5 on the warping drum 2 and relocate the warping drum 2 total. The drive control required for this purpose is not shown for reasons of clarity.

Of course it is also possible to combine several of these movements.

The conveyor belts 5 form a polygon seen from the front side of the warping drum 2 ago. Accordingly, the thread application 17 will also form a polygon. If now the warping drum 2 is rotated by the rotary drive 3 during warping, then the distance between the measuring device 20 and the surface 19 changes solely due to the polygonal structure of the thread application 17.

In order nevertheless to be able to easily obtain the desired parameter, the warping drum 2 has an angle transmitter 22, which cooperates with an angle sensor 23. Accordingly, a non-illustrated drive control "knows" when the thread application 17 is supported by a conveyor belt 5 when passing by the measuring device 20. The measuring device 20 then only records measured values, for example, when a conveyor belt 5 passes under it.

It is possible to carry out the regulation of the feed, ie the permanent monitoring and, if necessary, readjustment of the relative movement between the yarn guides 15 and the conveyor belts 5 during the entire warping process.

In many cases, however, it is sufficient to determine the necessary relative movement only at the first ribbon. It is then possible to record the course of this relative movement over the number of revolutions in a memory device (not shown) and then use this recorded profile later to control the elements involved in the relative movement.

Here, one can also make a certain smoothing of the function, so that an excessive stress on the drives involved in the consequences of the relative movement can be avoided.

Claims (12)

1. Method for generating a pattern warp, in which threads (11) are deposited with the aid of thread guides (15) on transport belts (5) which are arranged on the circumference of a warping drum (2), which form a polygon, as seen from the end face of the warping drum (2), and which can be moved axially parallel to the warping drum (2), and a thread coat (17) is generated, the thread guides (15) and the transport belts (5) being moved in relation to one another during deposition, characterized in that at least one parameter of the thread coat (17) on at least one transport belt (5) is determined, and the relative movement between the thread guides (15) and the transport belts (5) is controlled as a function of the parameter determined, wherein the parameter used is the height of the thread coat (17) and/or the parallelism of the surface (19) of the thread coat (17) to the axis of the warping drum (2) and/or the pitch of the free end face (18) of the thread coat (17).
2. Method according to Claim 1, characterized in that, to generate the relative movement, at least one of the following subassemblies is moved in a controlled way: the thread guide (15), traversing unit (14) on which the thread guides (15) are arranged movably, transport belts (5) and warping drum (2).
3. Method according to Claim 1 or 2, characterized in that the warping drum (2) is rotated during the deposition of the threads (11), and the determination of the parameter is limited to predetermined rotary positions of the warping drum (2).
4. Method according to one of Claims 1 to 3, characterized in that the thread coat (17) is generated by means of a sequence of ribbons arranged next to one another, the parameter is determined solely in respect of the first ribbon, and a function, employed in respect of the first ribbon, of the relative movement is used for all subsequent ribbons.
5. Method according to one of Claims 1 to 4, characterized in that transport belts (5) are used, which are assigned, at one end of a working region, a wedge-shaped bearing surface (10) having a predetermined pitch angle.
6. Pattern warping machine, with a warping drum (2), on the circumference of which a plurality of transport belts (5) movable parallel to the axis (7) of the warping drum (2) are arranged, which form a polygon, as seen from the end face of the warping drum (2), and with a plurality of thread guides (15), with the aid of which threads (11) can be deposited on the transport belts (5) in order to form a thread coat (17), the thread guides (15) and the transport belts (5) being movable in relation to one another parallel to the axis (7) of the warping drum (2), characterized in that a measuring device (20) is provided, which determines at least one parameter of the thread coat (17) on at least a transport belt (5) and which is connected to a drive control which controls the relative movement between the thread guides (15) and the transport belts (5), wherein the measuring device (20) determines at least one of the following parameters: height of the thread coat (17), parallelism of the surface (19) of the thread coat (17) to the axis (7) of the warping drum (2), and pitch of the free end face (18) of the thread coat (17).
7. Pattern warping machine according to Claim 6, characterized in that the transport belts (5) are assigned, at one end of a working region, a wedge-shaped bearing surface (10) having a predetermined pitch angle.
8. Pattern warping machine according to Claim 6 or 7, characterized in that, to generate the relative movement, at least one of the following subassemblies can be moved: the thread guide (15), traversing unit (14) on which the thread guides (15) are arranged movably, transport belts (5) and warping drum (2).
9. Pattern warping machine according to one of Claims 6 to 8, characterized in that the measuring device (20) is designed as a laser measuring device.
10. Pattern warping machine according to one of Claims 6 to 9, characterized in that the warping drum (2) has a rotary drive (3) and an angle transmitter (22, 23), the angle transmitter being connected to the measuring device (20).
11. Pattern warping machine according to one of Claims 6 to 10, characterized in that the measuring device (20) is displaceable parallel to the axis (7) of the warping drum (2).
12. Pattern warping machine according to one of Claims 6 to 11, characterized in that a memory device is provided, in which a relative-movement function can be stored, the memory device being connected to the drive control.

Images