EP2540881B1 - Sample warper - Google Patents

Description

The invention relates to a sample warping machine (see eg EP-A-1930 489 ) with a warping drum, which has an axis and parallel to the axis movable transport surfaces at its periphery, an auxiliary transport device having a receiving area in front of a front side of the warping drum, a gate in which at least one coil is arranged, and at least one yarn guide, the is arranged between the gate and the warper drum and a thread from the spool to the warping drum, wherein the yarn guide and the warper drum relative to each other in the circumferential direction about the axis and in the axial direction parallel to the axis are movable and the thread in response to a position of the Thread guide parallel to the axis on the circumference of the warping drum or on the auxiliary transport device can be stored.

A pattern warper serves to create a pattern string, that is, a string with a limited length. For this purpose, one or more threads are simultaneously guided around the circumference of the warping drum and stored there on the transport surfaces. In order to guide the threads around the circumference of the warping drum, one can either move the thread guide (s) around the circumference of the warping drum, or use thread guides held stationary in the circumferential direction and rotate the warping drum. If several threads are wound at the same time, these threads are also called "band". The tape is slightly offset with each turn, so that a winding is formed, which has a cone-shaped end face.

To extend the patterning options, you can control the thread guides so that they either lay the thread on the circumference of the warping drum or remove the thread from the patterning process. When the thread is laid on the circumference of the warping drum, the thread guide must be in an area within the axial length of the warping drum. When the thread is taken out of the patterning process, however, the thread guide is moved in front of the front side of the warping drum, so that the thread can be stored on the auxiliary transport device.

The change between a position in which the thread is deposited on the circumference of the warping drum, and a position in which the thread is deposited on the auxiliary transport device can take place relatively frequently. Depending on the number of threads used, the patterning and the width of the chain can be such a change several hundred times per chain.

Occasionally it may be possible that a thread which is actually intended to be deposited on the drum is still being wound onto the auxiliary transport device. Also, the reverse case is possible, in which a thread that is taken out of the sample process and is to be wound up on the auxiliary transport device, for example, hooked to another yarn guide and thereby is still stored on the drum. If such an error occurs, the pattern chain is degraded.

The invention has for its object to produce a pattern chain with the highest possible quality.

This object is achieved in a sample warping machine of the type mentioned above in that a yarn speed sensor is arranged between the coil and the warping drum.

The thread speed sensor determines the current speed of the thread. Knowing this speed, one is in a position to decide whether the thread is placed on the circumference of the warping drum or on the auxiliary transport device. If the thread is deposited on the circumference of the warping drum, then a winding has a length that is proportional to the diameter of the warping drum. On the other hand, when the thread is deposited on the auxiliary transporting device, one turn has one Circumference, which depends on the diameter of the auxiliary transport device. Since both windings are generated in the same time, the determination of the yarn speed allows a reliable statement as to whether the corresponding thread is also stored there, where this is desired. A normal yarn tension sensor can not do this because the yarn is tensioned in both cases, that is, regardless of whether it is placed on the circumference of the warping drum or on the auxiliary transport device.

Preferably, the yarn speed sensor generates a first signal when the yarn moves in a first speed range and a second signal when the yarn moves in a second speed range, wherein the first speed range is different from the second speed range. So you do not need the specific value of the thread speed. On the contrary, one can be satisfied with determining whether the thread moves in a first speed range or in a second speed range. For example, if he moves in the first speed range, one can assume that he is being wound up on the auxiliary transport device. If he moves in the second speed range, however, one can assume that it forms a turn on the circumference of the warping drum. Thus, the effort for the thread speed sensor can be kept small. The evaluation is also simplified, because you basically only have to pay attention to two signals. The signals can be directly at the position be generated, at which the thread passes through the sensor. However, it is also possible to generate the first signal and the second signal only in an evaluation device of the yarn speed sensor, to which the measured values are transmitted analog or digital.

The first speed range and the second speed range preferably have a predetermined distance from each other. This results in a security area. If the thread has a speed that lies between the two speed ranges, this is a clear sign that there is another error.

The thread speed sensor preferably has a learning input with which a current thread speed can be assigned to the first speed range or the second speed range. In this case, for example, it is possible to proceed by depositing the thread on the circumference of the warping drum and generating the windings there at the later desired operating speed. As soon as the operating speed has been reached, it is possible to inform the thread speed sensor, for example by means of a signal, that this speed belongs to the second speed range. Thereafter, laying the thread on the auxiliary transport device and then informs the thread speed sensor that this speed belongs to the first speed range.

Preferably, the first speed range comprises speeds of 0 to 60 m / min and the second speed range speeds of more than 200 m / min. The distance between these two speed ranges is sufficient for stable operation. A warping drum often has a diameter of the order of about 2.3 m. The auxiliary transport device often has a diameter of less than 5 mm. Once an operating condition is reached at which the pattern string is generated at more than 30 rpm, the thread speed sensor can operate reliably.

Preferably, the yarn speed sensor is arranged at the output of the gate. Thus, the thread speed sensor has the greatest possible distance from the warping drum. Thus, if an error occurs, it is possible to stop the warping drum or the thread guides, so that not too much thread has been wound in the wrong position.

Preferably, the thread speed sensor forms a thread guide. Thus, the threads can be managed even better.

Preferably, a plurality of thread speed sensors are combined in groups. This has several advantages. On the one hand, one can form a group of sensors mechanically relatively stable. On the other hand, you can summarize the groupwise combined sensors also signal, which facilitates the evaluation.

Preferably, the thread speed sensor is connected via a bus line to a control device of the sample warping machine. The thread speed sensor notifies the controller of the actual speed of the thread, it being basically sufficient, as stated above, to indicate whether the thread is moving at a speed out of the first speed range or out of the second speed range. The controller then compares whether the speed matches the desired position. If this is not the case, it can generate an error signal and interrupt the winding process, for example.

Preferably, the yarn speed sensor is designed as a piezoelectric sensor. A piezoelectric sensor can build relatively small. It is perfect for the desired application.

Fig. 1

eine stark schematisierte Darstellung einer Musterkettenschärmaschine und

Fig. 2

eine Leiste mit acht Fadengeschwindigkeits-Sensoren.

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

Fig. 1

a highly schematic representation of a sample warping machine and

Fig. 2

a bar with eight thread speed sensors.

Fig. 1 shows in highly schematic form a sample warping machine 1 with a warping drum 2 and a Gate 3. The warping drum 2 is rotatable about an axis 4 in the present embodiment, which is symbolized by an arrow 5. At the periphery of the warping drum 2 a plurality of conveyor belts 6 are arranged, which form transport surfaces. The respective outer run of the conveyor belts 6 can be moved parallel to the axis 4. A drive required for this purpose is not shown for reasons of clarity. The conveyor belts 6 are moved in the present case so that their movement is directed from the right end side to the left end side of the warping drum 2. This refers to the representation of the Fig. 1 ,

On the right front side of the warping drum 2, an auxiliary transport device 7 is arranged, which is for example designed as a "center line" and rotates at the same speed as the warping drum 2, when a pattern chain is to be produced.

In the gate 3 a plurality of coils 8a, 8b, 8c are arranged. Shown are three coils 8a, 8b, 8c. However, it is obvious that more coils can be used, for example, 128 coils.

From each coil 8a, 8b, 8c, a thread 9a, 9b, 9c is withdrawn and passed through a yarn guide 10a, 10b, 10c. The yarn guides 10a, 10b, 10c are individually displaceable parallel to the axis 4 of the warping drum 2 by drives 11a, 11b, 11c, which are symbolized here by arrows. The thread guides 10a, 10b, 10c can be positioned to be within the axial length of the warping drum 2. This is for the thread guides 10a, 10b shown. However, the thread guides can also be positioned so that they are located in front of the front side of the warping drum 2, ie in the area of the auxiliary transport device 7. When the warping drum 2 is rotated and with it the auxiliary transport device 7, then the threads 9a, 9b are applied to the warping drum 2 wound up and the thread 9c on the auxiliary transport device 7. In each case, the threads 9a, 9b, 9c are kept taut.

For each thread 9a, 9b, 9c, a thread speed sensor 12a, 12b, 12c is provided, which determine the respectively current speed of the threads 9a, 9b, 9c. This speed does not have to be determined excessively accurately. It suffices to determine whether the threads 9a, 9b, 9c move at a speed which is in a first speed range or in a second speed range. For example, the first speed range may include speeds of 0 to 60 m / min and the second speed range may include speeds of 200 m / min or more.

With the aid of the thread speed sensors, it is then possible to determine whether the threads 9a, 9b, 9c are wound on the circumference of the warping drum 2 or on the auxiliary transport means 7. Assuming, for example, that the warping drum 2 is rotated at 100 rpm is, then the speed of the threads 9a, 9b, which are wound on the warping drum 2, 700 m / min (the circumference of the warping drum 2 is usually about 7 m), while the speed of the thread 9c, the is wound on the auxiliary transporting device 7 is less than 5 cm / min, if it is assumed that the auxiliary transport device has a diameter of 1 cm. If you use an even thinner auxiliary transport device 7, then the speed is even lower.

With the help of the thread speed sensors 12a, 12b, 12c, it is therefore possible to determine whether a thread which is actually intended to be wound on the circumference of the warping drum 2 is actually wound there or whether it is wound up on the auxiliary transport device 7 due to a malfunction. The same applies in the reverse case. It can be determined whether a thread, which is actually taken out of the warping process and intended to be wound onto the auxiliary transport device 7, is also wound there or whether it is still being wound up on the circumference of the warping drum 2.

The yarn speed sensors 12a, 12b, 12c are connected via a bus line 13 to a control device 14. The control device 14 controls the thread guides 10a, 10b, 10c via control lines 15a, 15b, 15c. It therefore "knows" where the individual yarn guides 10a, 10b, 10c are and how fast the respective yarns 9a, 9b, 9c should actually run. It can then compare these desired speeds with the actual speeds determined by the thread speed sensors 12a, 12b, 12c. If the comparison gives a match, the pattern string is sharpened as desired. If the comparison does not match, there is an error. The controller 14 may be the Then stop warping drum 2 and output an error signal so that an operator can check the situation.

The fact that one only determines whether the current speed of a thread 9a, 9b, 9c is in a speed range, it is also irrelevant whether the winding diameter has increased on the warping drum 2 or on the auxiliary transport device 7 during winding.

It is also irrelevant whether a pattern chain is produced by turning the warping drum 2 and leaving the yarn guides 10a, 10b, 10c stationary in the circumferential direction or by securing the warping drum 2 against rotation during winding and by rotating the yarn guides 10a, 10b, 10c leaves. In the latter case, the gate 3 is formed as a rotary gate, which rotates with the yarn guides 10a, 10b, 10c. The thread speed sensors 12a, 12b, 12c rotate in this case with.

Fig. 2 shows a module 15 in which eight thread speed sensors 12 are combined into one group. The signals of these eight thread speed sensors 12 are transmitted via a common line 16 to the bus line 13, so that the thread speed sensors 12 are not only mechanically combined, but also signal groupwise can be evaluated. Of course, each yarn speed sensor 12 is evaluated separately within a group.

The thread speed sensors 12 also simultaneously form thread guides, i. a closed ring, through which the threads are guided, so that one can influence the course of the threads.

The thread speed sensors are designed as piezoelectric sensors. Such sensors are offered for example by the company ROJ, city, country .

The yarn speed sensors 12a, 12b, 12c are arranged at the output of the gate 3. Thus, they have the greatest possible distance to the warping drum 2. If an error occurs, the warping drum 2 can be stopped many times before a large number of windings have been generated faulty on the warping drum 2. In the best case, the warping drum 2 can even be stopped before a complete turn has been completed. In this case, an operator can make a correction by hand.

Fig. 2 shows a learning input 17 on the module 15, with which one can form the thread speed sensors so to speak self-learning. For this purpose, in a learning phase, all threads guided by the module 15 are wound on the circumference of the warping drum 2, which for this purpose rotates at the later operating speed, for example 30, 40, 50 or 100 rpm. By a corresponding signal at the learning input 17, the thread speed sensors are informed that this speed belongs to the second speed range. Thereafter, the threads can be wound onto the auxiliary transport device 7 and by a corresponding signal at the learning input 17, the thread speed sensors learn that this speed then belongs to the first speed range.

Claims (10)

1. Sample warper with a warping drum (2) which has an axis (4) and, on its circumference, transport surfaces (6) movable parallel to the axis (4), with an auxiliary transport device (7) which has a reception region in front of an end face of the warping drum (2), with a creel (3) in which at least one bobbin (8a, 8b, 8c) is arranged, and with at least one thread guide (10a, 10b, 10c) which is arranged between the creel (3) and the warping drum (2) and which guides a thread (9a, 9b, 9c) from the bobbin (8a, 8b, 8c) to the warping drum (2), the thread guide (10a, 10b, 10c) and the warping drum (2) being movable in relation to one another in the circumferential direction about the axis (4) and in the axial direction parallel to the axis (4), and the thread (9a, 9b, 9c) being depositable, parallel to the axis (4), on the circumference of the warping drum (2) or on the auxiliary transport device (7) as a function of a position of the thread guide (10a, 10b, 10c), characterized in that a thread-speed sensor (12a, 12b, 12c) is arranged between the bobbin (8a, 8b, 8c) and the warping drum (2).
2. Sample warper according to Claim 1, characterized in that the thread-speed sensor (12a, 12b, 12c) generates a first signal when the thread (9a, 9b, 9c) is moving in a first speed range, and generates a second signal when the thread (9a, 9b, 9c) is moving in a second speed range, the first speed range differing from the second speed range.
3. Sample warper according to Claim 2, characterized in that the first speed range and the second speed range are at a predetermined distance from one another.
4. Sample warper according to Claim 2 or 3, characterized in that the thread-speed sensor has a learning input (17), by means of which a current thread speed can be assigned to the first speed range or to the second speed range.
5. Sample warper according to one of Claims 2 to 4, characterized in that the first speed range comprises speeds of 0 to 60 m/min and the second speed range comprises speeds of more than 200 m/min.
6. Sample warper according to one of Claims 1 to 5, characterized in that the thread-speed sensor (12a, 12b, 12c) is arranged at the exit of the creel (3).
7. Sample warper according to one of Claims 1 to 6, characterized in that the thread-speed sensor (12a, 12b, 12c) constitutes a thread guide.
8. Sample warper according to one of Claims 1 to 7, characterized in that a plurality of thread-speed sensors (12) are combined in groups.
9. Sample warper according to one of Claims 1 to 8, characterized in that the thread-speed sensor (12a, 12b, 12c) is connected to a control device (14) of the Sample warper (1) via a bus line (13).
10. Sample warper according to one of Claims 1 to 9, characterized in that the thread-speed sensor (12a, 12b, 12c) is designed as a piezoelectric sensor.

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