EP2540884A1 - Sample warper - Google Patents

Abstract

The sample chain wrapping machine (1) has a warping drum (2), a thread guide assembly (7) with a thread guide (6), and multiple sub bars (9). The thread guide and the warping drum are movable relative to each other in a rotation direction around the axis of the warping drum. The sub bars are positioned in different radial positions relative to the axis of the warping drum. The sub bars distributed over their length are detachably connected with two positioning drives (14) and are displaceable by the positioning drives. A sensor arrangement (22) is connected with the positioning drives.

Description

The invention relates to a pattern warping machine having a warping drum, a yarn guide assembly having at least one yarn guide, and a plurality of sub-rods, wherein the yarn guide and the warping drum in a rotational direction about the axis of the warping drum are relatively movable and means are provided, the one through the yarn guide guide the guided thread at each partial rod above or below the partial rod.

A sample warping machine, also referred to as a "short warping machine", serves to create chains of limited length, while maintaining the greatest possible variety of patterning when creating the warp.

For this purpose, a so-called band is wound around the circumference of the warping drum. Such a band can one or more juxtaposed threads included. When the desired length of the chain has been wound up, the band is offset so that it comes to lie next to the already wound band and the process can be repeated. Optionally, one can change the order and / or the number of filaments in a belt in such a process.

If in this way the required width of the chain has been completed, then the bands are severed at the beginning and at the end of their length. To make this possible, the partial rods are provided which form crosses in a conventional manner at the beginning and at the end of the chain. Further partial rods can be provided, for example, for a sizing division.

To form the crosshair at the end of the chain, for example, the last turn of the band must be performed above the partial rod. All other turns of the band must then be below the dipstick. The term "above" the partial rod in the present specification means that the band is on the radially outer side of the partial rod (with respect to the warping drum). The term "below" the sub-bar means in the present specification that the tape is between the warping drum and the sub-bar.

To guide the threads accordingly, there are several possibilities. One possibility is to equip the sub-rods with catch fingers or hooks, which, if required to be extended to grasp a thread and guide it above the dipstick. Another possibility is to move the yarn guide while passing by the partial rod for a short time parallel to the axis of the warping drum so that the guided thread is either stored above the dipstick or the thread is passed axially past the tip of the dipstick, so that he in the further processing below the sub-rod comes to rest.

As the warping speed increases, however, it becomes increasingly difficult to ensure that the thread reaches the desired position relative to the partial bar. If the thread is mistakenly located below the split bar, although it should be located above the split bar, or vice versa, it will later be relatively difficult to properly cut and unwind the chain. Accordingly, there is a certain limit to the warping speed.

The invention has for its object to provide a high warping speed at a sample warping machine.

This object is achieved in a sample warping machine of the type mentioned above in that at least one partial rod is positionable in different positions relative to the axis of the warping drum.

This makes it possible to position the bar so that its position and the radial thickness of the thread application fit each other. This applies in particular to a partial rod in which the thread with the largest part of its turns must be arranged below the part of the rod. So you can adjust the position of the sub-rod to the desired length of the chain. The length of the chain gives the number of turns necessary to form the desired length. The number of turns is given by the length of the chain divided by the circumference of the warping drum. The number of turns multiplied by the thickness of the thread gives a measure of the radial thickness of the thread application. If you now the sub-rod positioned too close to the warping drum, so that this thickness is exceeded, then there is not enough space for the chain available. The wound-up warp yarns then bend the bar outwards so that the tip of the bar is no longer where it should be. This makes it more difficult to ensure that the thread is deposited in the desired manner above or below the partial rod. The same problem arises when the part-bar is too far away from the warping drum. In this case, although there is enough space available for the thickness of the thread application. But there remains an additional space between the thread application and the sub-rod. The filaments wound up above the partial rod then bend the partial rod radially inwards, so that the same problem arises. If, on the other hand, one can position the partial rod radially relative to the axis of the warping drum, then this problem does not arise. You can position the bar so that it is little or even not bent by the wound threads, so that his Tip always stays in the desired position. With a sufficiently precisely positioned partial rod, therefore, a high warping speed can be achieved.

Preferably, the partial rod is displaceable by a positioning drive. You can then make the positioning of the sub-rod so to speak remotely, possibly even in operation, if it should turn out that the sub-rod has not yet taken the correct position. The positioning drive can be designed in a simple manner as a linear drive. It merely has to ensure that the partial rod can be extended and retracted radially relative to the axis of the warping drum. It is not even necessary that the radial direction is strictly adhered to during the movement. The positioning drive must therefore not act perpendicular to the tangent to the warping drum, but can, if necessary, also take an angle to it.

Preferably, the partial rod is detachably connected to the positioning drive. This has the advantage that the partial rod can be easily removed from the positioning drive, if this should be necessary, for example, when unwinding the finished chain.

However, it is particularly preferred that the partial rod distributed over its length is connected to at least two positioning drives which are independently detachable from the partial rod. With at least two positioning drives, the partial rod can be held at the beginning of the warping operation at two or more locations, so that he, for example can run exactly parallel to the axis of the warping drum, which simplifies the formation of the warp. However, the chain is shifted with increasing width on the warping drum away from the end face at which the threads are placed. The positioning would in this case prevent further movement of the chain. One can therefore first solve the positioning of the part of the bar, which is the front side closest to where the threads are placed. The release and retraction of the positioning drive into the warping drum takes place shortly before the chain, which is transported away from said end face during warping, reaches this positioning drive. For this reason, the release of the positioning drive is not critical. The partial rod is already fixed by the chain at this time sufficiently.

Preferably, a sensor arrangement is provided which determines a height of a thread application, wherein the sensor arrangement is connected to the positioning drive. The sensor arrangement is thus able to position the partial rod with the aid of the positioning drive in such a way that the position fits relatively precisely to the height or thickness of the thread application. As a rule, it is necessary to warp several bands at the beginning of the warping process. If the sub-staff at this time have a wrong position, this is not critical. As soon as the formation of the thread application has stabilized, however, the partial rod can be moved into its correct position. If conveyor belts with a cone-shaped support surface are arranged on the circumference of the warping drum, then the determination of the thickness of the thread application usually after the first band possible.

In this case, it is preferable for the positioning drive to position the partial rod in a position in which the height of the thread application remains free below the partial rod. As stated above, this is the correct position of the sub-rod. The partial rod allows radially in the direction of the axis of the warping drum to a sufficient space so that all turns of the thread application or the chain can be accommodated. However, the partial rod is not so far removed from the thread application that it is bent radially inward when threads are wound radially outward on him.

Preferably, the partial rod is attached to the warping drum. In this case, one can use a warping drum with a substantially cylindrical cross-section. With such a warping drum, high warping speeds can be achieved.

Preferably, the warping drum rotates during warping and the yarn guide is fixed in the direction of rotation. Again, this is a measure to achieve relatively high warping speeds. The movement of the thread guides can then be limited to a pure movement parallel to the axis of the warping drum. This also simplifies the control.

Preferably, at the periphery of the warping drum transport surfaces are arranged, which by a transport drive be displaced parallel to the axis of the warping drum, wherein the transport drive and the positioning drive are synchronized with each other. If the transport drive has moved the transport surfaces a predetermined distance away from the front side of the warping drum, at which the threads are wound, then the first positioning can be solved by the sub-rod and the positioning drive can be retracted. It automatically ensures, so to speak, the right time at which the positioning drive clears the way for the chain.

In an alternative or additional embodiment, provision may be made for a chain width determination device to be provided which determines a length of a thread application parallel to the warping drum, the chain width determination device having a control output connected to the positioning drive. The chain width determining device can be formed for example by a sensor which detects the width of the chain or even only the position of the side facing away from said end side of the chain. Also, since the width of the wound tapes is known, the warp width detecting apparatus can be easily constituted by a counter which detects the number of tapes wound up. This also ensures that the positioning drive is retracted in good time, ie not too late and not too early, in order to free up the space that the chain needs when it is transported away from the end face where the threads are wound up.

Fig. 1

eine schematische perspektivische Ansicht einer Musterkettenschärmaschine und

Fig. 2

eine schematische Darstellung eines Positionierantriebs.

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

Fig. 1

a schematic perspective view of a sample warping machine and

Fig. 2

a schematic representation of a positioning drive.

Fig. 1 schematically shows a pattern warping machine 1 with a warping drum 2, which is connected to a rotary drive 3 shown only schematically. The rotary drive 3 is able to rotate the warping drum 2 during winding in the direction of an arrow 4.

In a creel, not shown, a plurality of coils is arranged. In the present embodiment, up to 128 coils can be arranged in the gate. From each spool, a thread is withdrawn and passed through a yarn guide eyelet 5 of a yarn guide 6. All yarn guides 6 together form a yarn guide arrangement. 7

The yarn guides 6 are in the archipelago, so when generating the pattern chain, in the direction of rotation 4 of the warping drum 2 still. However, the yarn guides 6 can be moved in the axial direction, ie parallel to the axis of the warping drum 2 in such a way that the yarn guide eyelets 5 are guided in the axial direction over the warping drum 2. The guided by the yarn guide eyelets 5 threads are then on Placed conveyor belts 8, forming the transport surfaces and, when viewed from the front side of the warping drum 2 on the warping drum 2, are arranged polygonal. The respective radially outer run of the conveyor belts 8 are moved away by a transport drive, not shown, from the end face on which the yarn guide arrangement 7 is arranged. If threads are to be taken out of the patterning process, then they are not stored on the circumference of the warping drum 2, but the yarn guide eyelets 5 are moved in front of the end face of the warping drum 2. The guided by these yarn guides 5 threads are then wound onto a center line, not shown.

In order to form so-called crosshairs or sizing divisions, part rods 9 are provided, which are arranged between conveyor belts 8. Each partial rod 9 has at its the yarn guide assembly 7 facing the end of a tip 10, which has substantially radially outward. The tip 10 is immovably arranged here on the partial rod 9.

Each partial rod 9 is held at at least two positions 11, 12 on the warping drum 2. The part rods 9 thus rotate with the warping drum 2, when the warping drum 2 is rotated.

Fig. 2 shows the holder of the partial rod 9 at the position 12. Here, the warping drum 2 has an opening 13 through which a positioning drive 14 is guided radially outward. The positioning drive 14 has an in the direction a double arrow 15 displaceable plunger 16. At the radially outer end of the plunger 16, a pair of pliers with two jaws 17, 18 is arranged, which hold the partial rod 9 by clamping. However, the jaws 17, 18 can be pivoted in the direction of arrows 19, 20. The necessary drive is not shown here for reasons of clarity. When the jaws 17, 18 have been pivoted away from the partial rod 19, the positioning drive 14 is released from the partial rod 9. The plunger 16 can then be moved radially inwards, so that the jaws 17, 18 no longer project beyond the warping drum 2.

Basically, it is sufficient if the plunger 16 has been displaced radially inward so far that the jaws 17, 18 of the pliers no longer protrude radially beyond the outer run of the conveyor belts 8. The outer strands of the conveyor belts 8 define an inner boundary 21 for the forming on the warping drum thread order, so the forming coil.

A sensor arrangement 22 is provided on the front side of the warping drum 2. On the one hand, the sensor arrangement 22 detects the position of the part rods 9. On the other hand, it also determines the height or thickness of the thread application on the conveyor belts 8.

With this thickness information, a control input 23 of the positioning drive 14 is supplied. With this thickness information, the positioning drive 14 can then position the partial rod 9 so that exactly the space between the radial inner side of the partial rod 9 and the boundary 21 is available, the thread order needed with its thickness. This has the consequence that the sub-rod 9 is not pressed by the thread application radially outward and then bent. On the other hand, however, the partial rod 9 is not bent radially inward by threads which are guided radially on the outside of the partial rod 9, in other words are arranged above the partial rod.

This embodiment has the advantage that the tips 10 of the partial rods 9 do not change their position in that the partial rods 9 are bent by the thread application. Accordingly, it is possible, when a cross is to be generated, to guide the thread guide eyelets around a tip 10 of a partial rod 9 such that the correspondingly guided thread either above the partial rod 9 (ie radially outside of the partial rod 9) or below the partial rod 9 (FIG. in other words radially below the sub-rod 9) can be performed. Since the position of the tips 10 is thus not changed by the wound threads, it is possible to produce a high warping speed, without letting the effort for controlling the thread guides 6 become too great.

When the thread application, so the forming warp, has reached a certain width (= extension parallel to the axis of the warping drum 2), then it approaches the positioning drive 14, which is arranged at the position 12, ie at the position which Adjacent end face on which the yarn guide assembly 7 is arranged. The plunger 16 of the positioning drive 14 would interfere with the further transport of the chain away from the front side here. When the chain reaches position 12, however, it already holds the partial rod 9 firmly in place. Another mount is then basically no longer necessary. The positioning drive 14 is then released by pivoting away the jaws 17, 18 from the partial rod 9 and the plunger 16 is moved so far radially inward, that the space between the boundary 21 and the partial rod 9 is free. The same process is repeated when the chain reaches the position 11 and optionally at other positions where the sub-rod 9 is held on the warping drum 2.

So that the plunger 16 of the respective positioning drive 14 is not retracted too early and not too late, one can use a number of information.

Since the chain, i. the thread application is transported by the conveyor belts or generally the transport surfaces, the transport drive can provide the information as to how far he has moved the transport surfaces. If the transport drive has thus moved the transport surfaces by a predetermined distance from the front side of the warping drum 2, on which the thread guide assembly 7 is arranged, then the thread application (= the chain) of the respective position 12 has come so far that the plunger 16 must be retracted.

Alternatively or additionally, one can also use a sensor, not shown, which determines the width of the chain or the thread application. In many cases it will also be sufficient if the sensor detects the position of the Determines edge of the chain, which faces away from the front side of the warping drum 2, on which the yarn guide assembly 7 is arranged.

Another possibility is to determine the width of the chain by adding the widths of these bands in known widths of wound tapes. A band consists of one or more threads that are wound up at the same time. As briefly mentioned above, in the present case a band can have 1 to 128 threads. Not all bands have to be the same width. But since the desired pattern is known, the composition and thus the width of the tapes is known.

In principle, the same solution can also be used if the tips 10 of the partial rods 9 are not fixedly connected to the partial rods 9. In this case, the tips 10 are designed as catching hooks which can be pivoted in the path of the threads to guide a thread above the part of the bar, or are kept out of the way of the threads to deposit the threads below the part rods 9.

You can also use the arrangement shown, when the warping drum 2 is stationary in the archipelago and the yarn guide 6 are rotated about the axis of the warping drum 2.

Claims (10)

Sample warping machine (1) with a warping drum (2), a yarn guide assembly (7) having at least one yarn guide (6), and a plurality of sub-rods (9), wherein the yarn guide (6) and the warping drum (2) in a rotational direction (4 ) are movable relative to one another about the axis of the warping drum (2) and means are provided which guide a yarn guided by the yarn guide (6) on each partial rod (9) above or below the partial rod, characterized in that at least one partial rod (9 ) is positionable in different positions relative to the axis of the warping drum (2). Sample warping machine according to claim 1, characterized in that the partial rod (9) by a Positioning drive (14) is displaceable. Sample warping machine according to claim 2, characterized in that the partial rod (9) is releasably connected to the positioning drive (14). Sample warping machine according to claim 3, characterized in that the partial rod (9) distributed over its length with at least two positioning drives (14) is connected, which are independently from the partial rod (9) detachable. Sample warping machine according to one of claims 2 to 4, characterized in that a sensor arrangement (22) is provided which determines a height of a thread application, wherein the sensor arrangement (22) is connected to the positioning drive (14). Sample warping machine according to claim 5, characterized in that the positioning drive (14) the sub-rod (9) positioned on a positioning position in which below the sub-rod (9), the height of the thread application remains free. Sample warping machine according to one of claims 1 to 6, characterized in that the partial rod (9) is detachably fastened to the warping drum (2). Sample warping machine according to claim 7, characterized in that the warping drum (2) rotates during warping and the yarn guide (6) in the direction of rotation is stationary. Sample warping machine according to one of claims 2 to 8, characterized in that the periphery of the warping drum (2) transport surfaces (8) are arranged, which are displaceable parallel to the axis of the warping drum (2) by a transport drive, wherein the transport drive and the positioning drive (14 ) are synchronized with each other. Sample warping machine according to one of claims 2 to 8, characterized in that a chain width determining device is provided which determines a length of a thread application parallel to the axis of the warping drum (2), wherein the chain width determining device has a with the positioning (14) connected control output ,

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