EP1930489B1 - Sample warper and method for forming a sample warp - Google Patents

Description

The invention relates to a pattern warping machine with a warping drum, on the circumference of which a plurality of transportable in the axial direction of the warping drum transport surfaces are arranged, a plurality of yarn guides, which are arranged on a yarn guide carrier, and a gate from which pull the yarn guide threads, wherein the warping drum and the yarn guide in Circumferentially movable relative to each other.

Furthermore, the invention relates to a method for producing a pattern chain in which, with the aid of yarn guides, which are attached to a yarn guide carrier, leads of multiple threads around the circumference of a warping drum and deposits there on moving in the axial direction of transport surfaces, wherein the number of threads changed per band between at least two bands.

Such a pattern warping machine and such a method are for example out DE 10 2005 003 234 A1 known. Here is a sample warping machine described with a warping drum, at the periphery of which a plurality of movable in the axial direction of the warping drum transport surfaces are arranged, a plurality of yarn guides, which are arranged on a yarn guide carrier, and a gate, from which the thread guides remove threads, wherein the warping drum and the yarn guide in the circumferential direction relative to each other are. This movement is generated by the fact that the rotary gate is rotated by a motor relative to the stationary warping drum. The warping drum is supported by a base on a floor. The rotary gate is arranged on a sliding base, which is formed on a slide rail. The rotary gate is movably mounted on the slide by a slide block and can approach or separate from the warping drum.

JP 03 764474 B1 (= DE 10 2005 050 369 A1 ) also describes a pattern warper and a method for producing a pattern string. The sample warping machine has a warping drum, on whose circumference a plurality of conveyor belts are arranged. Threads withdrawn from a rotary gate are laid on the conveyor belts by thread guides as the rotary gate rotates together with the thread guides.

EP 0 933 455 A2 shows an electronically controlled sample warping machine with a warping drum and two gates, which are arranged on an end face of the warping drum. The gates stand up with rollers on the floor.

A similar embodiment is made DE 199 24 379 A1 known. Again, a gate, which is arranged in front of the front side of a warping drum, with rollers on the floor.

A pattern warping machine, also referred to as a "short warper", serves to make pattern chains. For this purpose, several threads simultaneously guided around the circumference of a warping drum and stored there on transport surfaces, which are often formed by circulating transport belt. If a tape has been wound up with the necessary length of the threads for the pattern chain, ie with the necessary number of turns, then the transport surfaces of this tape must have transported so far that space for the support of a new band is available.

Usually, the tapes are wound so that a cone-shaped end face of the coil is formed. Ultimately, therefore, successive turns are always wound around a predetermined increment in the axial direction offset from each other.

This technique has proven itself. Modern pattern warp machines can wind up to 16 threads at a time, giving high productivity.

For some pattern designs, however, it is necessary to change the number of threads per band. In extreme cases, this can lead to a band consisting of only one thread, while another band is formed by the maximum number of threads. This would, without additional measures, result in the pattern chain having a non-uniform density.

It has therefore already been proposed to adapt the speed with which the transport belts are moved to the width of the bands, that is to the number of threads per band. So if more threads per band are wound, then the transport belts have a higher speed in the axial direction. If fewer threads are contained in a band, then the transport belts run at a lower speed, so that regardless of the number of threads per band, the bands can be joined together in the axial direction and the chain has a uniform density.

However, this solution is relatively expensive. It requires drives for the conveyor belt, the speed of which is adjustable depending on the number of threads. Since at the same time you must still make sure that the winding, which is formed by the wound threads, a conical face receives, you must consider several overlapping speeds when programming the drives for the conveyor belt, which also makes the setting very expensive.

The invention has for its object to produce a pattern chain with unequal bands with little additional effort, which has a good uniformity.

This object is achieved with a sample warping machine of the type mentioned above in that the warping drum and the yarn guide carrier are movable by a drive in the axial direction relative to each other so that two bands adjoin one another.

This configuration makes it possible to decouple the movement correction, which is required to compensate for the different bandwidths, ie the different thread counts per band, from the feed movement of the transport surfaces. This will change the setting speed greatly simplified. The necessary for driving the transport surfaces motors can be made easier because they do not have to be operated at varying speeds during a production process. Accordingly, these motors and their control can be made less expensive. Control over the movement of all elements involved is simplified. A fitter can relatively easily monitor and adjust the relative movement between the warper drum and the yarn guide carrier so that successive belts join together seamlessly, so that the pattern chain is given a uniform density.

In a preferred embodiment it is provided that the yarn guide carrier and the gate are connected to each other in the axial direction, wherein the warping drum and the gate are movable relative to each other in the axial direction. In many cases, the yarn guide carrier and the gate form a unit which can then be completely displaced relative to the warping drum. The yarn guide carrier is formed for example by a rotating relative to the warping drum element, such as a ring or an array of spokes on which or the thread guides are attached. The displacement of the yarn guide carrier relative to the warping drum or the displacement of the warping drum relative to the yarn guide carrier is a relatively simple measure for which no major effort is required.

Preferably, the transport surfaces on a drive which is adjustable to a constant speed. A drive only with a constant speed must run, can be formed inexpensively. A control that allows changing speeds is not required. Above all, such a drive can be programmed relatively easily to the parameters required for a warping operation.

Here, it is preferable that the speed is set to a value lower than the speed required for the widest band and higher than the speed necessary for the narrowest band. So averages the speed of the transport surfaces, so that all the bands of a repeat can be wound with the desired position.

Preferably, the yarn guides are movable relative to the yarn guide carrier in the axial direction. You can then use the thread guides to form the cone on the front side of the roll. Thus, one can distribute the three essential movements that are necessary for the production of the pattern chain, on three different elements. The cone is made by the movement of the thread guide relative to the thread guide carrier. The removal of the coil, which is necessary to make room for a new band, is realized by the transport surfaces. The positioning of the bands relative to the winding is realized by the relative movement between the warping drum and the yarn guide carrier in the axial direction. Since all three movements are then relatively easy to determine movements, the adjustment can also be made by staff, which has a lower qualification.

The thread guides preferably have a drive which moves the thread guides per revolution by a predetermined distance from an end face of the warping drum. For example, you can set the drive so that the yarn guide at each circulation to three times the thickness of the threads to the rear, ie away from the front side of the warping drum, are moved. This results in a cone with a cone angle of just over 18 °.

The warping drum and / or the thread guide carrier preferably have a spindle drive. In a spindle drive, a spindle is set in rotation with a thread. The thread of the spindle is in engagement with a mating thread on the warping drum or on the thread guide carrier, so that the result of the rotation of the spindle is a translational displacement of warping drum and / or yarn guide carrier in the axial direction. Since the relative movement is very small - it is in the order of the difference between the thread counts of the individual bands multiplied by the width of the threads - you can use a relatively small pitch of the thread, so that one of the drive, for the relative axial movement is required, no need to make too big demands.

In an alternative embodiment it can be provided that the warping drum and / or the yarn guide carrier have a rack and pinion drive. Hereby, the small relative movements between the warping drum and the yarn guide carrier can be realized without problems.

The object is achieved in a method of the type mentioned above in that one moves the warping drum and the yarn guide carrier relative to each other in the axial direction so that two bands adjoin one another.

This makes it possible to position the yarn guides relative to the warping drum so that the bands can then connect directly to each other even if the bands do not have the same number of threads. A band with a large number of threads requires slightly more space on the transport surface arrangement. When this band is completed, but the transport surface has not yet transported the band far enough away from the front side of the warping drum, the yarn carrier and the warper drum are moved relative to each other so that the yarn guides can wind the next band following the preceding band , The warping drum and the yarn guide carrier are therefore slightly removed from each other in this case. If, however, the finished tape had only a few threads, then the transport surfaces of this band have moved a little too far away. In this case, the warping drum and the yarn guide carrier are again positioned closer to each other, so that the next band can in turn connect to the previous band.

Preferably, the transport surfaces are moved at a constant speed. This makes it possible to use relatively simple drives. A constant speed can be set easily, so that the programming of the sample warping machine is not made too great. If the transport surfaces be moved at a constant speed, then there is less wear.

In this case, it is preferred that the transport surfaces are moved at a speed which corresponds to an average speed for all bands of a repeat. A repeat is a pattern that repeats across the width of the pattern chain. If you now set the speed of the transport surfaces so that when creating a repeat all threads have the necessary space, then you can compensate for the remaining differences resulting from different widths of the bands by the relative movement between the warping drum and the yarn guide carrier.

It is also advantageous if you move the warping drum and the yarn guide carrier at the transition between two bands. This is a relatively simple way to control whether the adjustment of the relative movement between the warper drum and the yarn guide carrier in the axial direction is selected correctly. Only a relatively short movement is required, so that the speed during the relative movement can be kept small. In the transition between two bands, the thread guides usually have to be moved in any case from the end of the cone in the axial direction to the beginning and beyond. If the thread guides can perform this movement, then there is also enough time to move the warper drum and thread guide carrier relative to each other.

Fig. 1

eine perspektivische Darstellung einer Musterkettenschärmaschine, jedoch ohne Fadenführer und Fadenführerträger,

Fig. 2

einen schematischen Teillängsschnitt durch die Musterkettenschärmaschine der Fig. 1, jedoch mit Fadenführer und Fadenführerträger,

Fig. 3

einen Fadenführer am Fadenführerträger und

Fig. 4

eine schematische Darstellung zur Erläuterung zweier Möglichkeiten zur Verstellung von Schärtrommel und Fadenführerträger relativ zueinander.

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

Fig. 1

a perspective view of a sample warping machine, but without thread guide and yarn guide carrier,

Fig. 2

a schematic partial longitudinal section through the sample warping machine of Fig. 1 , but with thread guide and thread guide carrier,

Fig. 3

a yarn guide on the yarn guide carrier and

Fig. 4

a schematic representation for explaining two ways to adjust the warping drum and yarn guide carrier relative to each other.

A sample warping machine has a warping drum 1, on the circumference of which a plurality of transport belts 2 are arranged, which are moved parallel to the axis of the warping drum in the direction of an arrow 3 when a pattern chain is being sharpened. Unspecified part bars serve as cross, sizing or other functions. The outer run of the conveyor belt 2 each forms a transport surface.

A rotary gate 7 has a rotor 8, to which a plurality of coils 9 are attached. The rotor 8 can be driven by a motor 10 via a belt drive 11 and a hollow shaft 12.

Synchronously with the hollow shaft 12, a further hollow shaft 13 is rotated ( Fig. 2 ), on which a yarn guide carrier 15 is fastened in a rotationally fixed manner, the yarn guide 14 has. The yarn guide carrier 15 has radial arms 17, which are held in a hub 16. At the outer end of the radial arms 17 lever 18 are hinged, which can be pivoted by means of a stepping motor 19 and at the top of the yarn guide 14 are arranged in the form of eyelets. Shown are the thread guide 14 three positions, of which a position a is relatively far away from the front side of the warping drum 1, a position b is arranged closer to the front side of the warping drum 1 and a position c is arranged in front of the front side of the warping drum 1. The stepper motors 19 are actuated by a control device 20.

In the active during the warping operation working positions a and b, the yarn guide 14 threads 21 from the rotary gate 7 and put it on the conveyor belt 2 from, so that a winding 22 is formed. In the position c, the thread guides 14 are inactive during the warping process, and the thread guides 14 guide unnecessary threads 21 'in a gap 23 between the conveyor belt 2 and the yarn guide carrier 15, so that they do not participate in the warping process. These threads 21 'are deposited on an auxiliary transport device 24, which for example has the form of a wire-shaped, monofilament plastic thread, which is unwound from a supply roll 25 and guided by the two hollow shafts 12, 13 to a drive device 26. On this auxiliary transport device 24 is then a waste wrap 27th wrapped, which can be collected in a waste container 28.

It can be achieved by the pivoting movement of the lever 18 and the associated axial displacement of the yarn guide 14 relative to the yarn guide carrier 15 and the warping drum 1, that on the one hand threads 21 are stored on the conveyor belt 2, on the other hand, threads 21 'not participate in the warping process , This makes it possible to wind in a single Schär order bands with a larger number of threads around the circumference of the warping drum 1 and bands with a smaller number of threads.

The yarn guides 14 are moved during the warping process so that a cone-shaped end face of the coil 22 is formed. In other words, the yarn guides are moved around the warping drum 1, for example, three times the yarn thickness during each rotation.

The transport belt 2 are moved so that after the completion of a band, so the winding of the tape with the necessary number of revolutions for the length of the pattern chain in the area of the front side of the warping drum 1 again enough space available to wrap a new tape to be able to. If necessary, this movement of the transport belt 2 must be taken into account in the movement control of the yarn guide 14.

If you now wrap bands with different numbers of threads, then these bands also need different amounts of space in the axial direction of the warping drum. 1

It is therefore the speed of the conveyor belt so that it corresponds to the average speed for a repeat. For example, if a repeat is made up of a total of 100 threads composed of 10 ribbons, with the sequence being 12-12-8-8-12-12-8-8-12-8 threads per band, then you set the speed the transport belt 2 so that it would be correct for a band with 10 threads. However, this has the consequence that the conveyor belt 2 for a band with 12 threads too slow and for a band with 8 threads to run too fast. Accordingly, after the completion of a band with 12 threads, there is basically no longer enough space in the range of movement of the thread guides 14 to be able to produce the next band.

To create this space, the yarn guide carrier 15 is moved relative to the warping drum 1, as shown by an arrow 29. So if a band has been wound with 12 threads, then the yarn guide carrier 15 is moved slightly to the right (based on the representation of Fig. 2 ), if you move on to the next band. If, however, a tape with only 8 threads has been wound, then the yarn guide carrier 15 is moved to the left, based on the representation of Fig. 2 ,

Of course, it is also possible not or not only to move the yarn guide carrier 15 in the axial direction of the warping drum 1, but also the warping drum 1 itself to produce the desired relative movement.

Since the yarn guide carrier 15 is connected to the rotary gate 7, in this embodiment, the rotary gate 7 is moved with.

Fig. 4 now shows some ways how to effect this movement. Same elements as in Fig. 1 to 3 are provided with the same reference numerals.

The warping drum 1 is rotatably mounted on a support 30 which is supported on rollers 31 on the floor F. A fixedly held motor 33 drives a threaded spindle 34, which engages in an internal thread 35 on the carrier 30. Thus, when the motor 33 is actuated, then the rotation of the threaded spindle 34 results in a displacement of the carrier 30 in the direction of the double arrow 29th

Another or additional possibility is to support a carrier 36 to which the rotary gate 7 and the thread guide carrier 15 are fastened, likewise via rollers 37 on the floor F. The carrier 36 has a drive 38 which drives a gear 39 which is engaged with a rack 14 which is mounted on the floor F.

Of course, it is also possible to drive either only the carrier 30 or only the carrier 36. It is also possible to drive the support 30 via gear 39 and toothed rack 40 and the support 36 via a threaded spindle 34.

Since the relative movement in the direction of the double arrow 29 is relatively small, a weak drive suffices. The relative movement does not have to be very fast. Basically, it is sufficient to bridge the thread difference that is formed between individual bands.

The sample warping machine has been described with a drum fixed in the course of warping and a rotating yarn guide carrier 15. However, it is also possible to hold the yarn guide carrier 15 in rotation during warping and to allow the warping drum to rotate. Also in this embodiment, one can realize an axial relative movement 29 between warping drum 1 and yarn guide carrier 15 to always create the required space on the conveyor belt 2 for tapes with different thread counts.

Claims (12)

1. Sample warper having a warping drum (1), on the circumference of which are arranged a plurality of transport surfaces (2) which are movable in the axial direction of the warping drum (1), having a plurality of thread guides (14) which are arranged on a thread guide carrier (15), and having a creel (7) from which threads (21) are drawn off by the thread guides (14), with the warping drum (1) and the thread guides (14) being movable relative to one another in the circumferential direction, characterized in that the warping drum (1) and the thread guide carrier (15) can be moved relative to one another in the axial direction by a drive (33-35, 39, 40) in such a way that two bands adjoin one another.
2. Sample warper according to Claim 1, characterized in that the thread guide carrier (15) and the creel (7) are connected to one another in the axial direction, with the warping drum (1) and the creel (7) being movable relative to one another in the axial direction.
3. Sample warper according to Claim 1 or 2, characterized in that the transport surfaces (2) have a drive which can be set to a constant speed.
4. Sample warper according to Claim 3, characterized in that the speed is set to a value which is lower than the speed required for the widest band and higher than the speed required for the narrowest band.
5. Sample warper according to one of Claims 1 to 4, characterized in that the thread guides (14) are movable in the axial direction with respect to the thread guide carrier (15).
6. Sample warper according to Claim 5, characterized in that the thread guides (14) have a drive (19) which moves the thread guides (14) away from an end side of the warping drum (1) by a predetermined distance per revolution.
7. Sample warper according to one of Claims 1 to 6, characterized in that the warping drum (1) and/or the thread guide carrier (15) have/has a spindle drive (33-35).
8. Sample warper according to one of Claims 1 to 7, characterized in that the warping drum (1) and/or the thread guide carrier (15) have/has a rack-and-pinion drive (39, 40).
9. Method for forming a sample warp, in which method, using thread guides (14) which are fastened to a thread guide carrier (15), bands composed of a plurality of threads (21) are guided around the circumference of a warping drum (1) and, there, are laid on transport surfaces (2) which move in the axial direction, with the number of threads per band being changed between at least two bands, characterized in that the warping drum (1) and the thread guide carrier (15) are moved relative to one another in the axial direction in such a way that two bands adjoin one another.
10. Method according to Claim 9, characterized in that the transport surfaces (2) are moved with a constant speed.
11. Method according to Claim 10, characterized in that the transport surfaces (2) are moved with a speed which corresponds to a mean speed for all the bands of a repeat.
12. Method according to one of Claims 9 to 11, characterized in that the warping drum (1) and the thread guide carrier (15) are moved at the transition between two bands.

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