EP2284303B1 - Rotary creel of a sample warping machine, sample warping machine and method for measuring a bobbin diameter - Google Patents

Abstract

The creel (5) has carriers (9, 10) rotatably supported to a machine frame around a rotation axis, and a set of reel supports arranged on the carriers. A sensor arrangement is provided for determining a filling level of reels (12, 13) arranged in the reel supports. The sensor arrangement exhibits a sensor that is movable parallel to the rotation axis. The sensor is arranged on a sliding rail, which is arranged at the machine frame. The sensor is designed as a contactlessly operating sensor such as laser sensor. An independent claim is also included for a method for measuring a filling level of reels of a sample warping machine.

Description

The invention relates to a rotary gate of a sample warping machine with a support rotatably mounted about a rotation axis, on which a plurality of coil seats are arranged, wherein a sensor arrangement is provided, with a degree of filling and thus a remaining thread length of coils arranged in the bobbins can be determined.

Furthermore, the invention relates to a sample warping machine with a warping drum, thread guides, which are rotatable about the axis of the warping drum, and a rotary gate.

The invention also relates to a method for measuring a degree of filling of bobbins of a sample warping machine, wherein the bobbins are arranged in bobbin holders on a carrier rotatably mounted about a rotation axis.

Sample chain warping machines are typically used for the production of pattern chains or so-called short chains. In this case, threads are wound onto a warping drum with a relatively large circumference, wherein the warping drum is held against rotation during winding. A warping drum has a relatively large circumference of, for example, about 7 meters. Distributed over the circumference several conveyor belts are arranged, which run parallel to the axis of the warping drum. The threads are deposited by means of thread guides on the conveyor belts, which rotate about the axis of the warping drum. The threads are removed from a gate. If several threads are to be placed simultaneously around the circumference of the warping drum, a so-called rotary gate is required, which rotates synchronously with the yarn guides. If you do not want to store individual threads on the circumference of the warping drum, you can take them out of the warping process and wrap, for example, a soul or center line, which is arranged in the axis of the warping drum.

The thread consumption depends on the pattern of the pattern or short chain to be generated. The withdrawn from the coils from the creel threads are thus consumed in different lengths. This can cause a spool to drain before the chain is finished. Accordingly, monitoring of the yarn supply on the bobbins is usually required. If a spool has run out, the sample warping machine must be stopped. The corresponding coil must then be replaced. You can see the end of the thread of the expired coil with the beginning knot the thread of the new spool to ensure, so to speak, a continuous operation.

The monitoring of the thread supply may e.g. done by an operator. However, the rotational speed of the rotary gate must then be kept relatively low so that a user can visually monitor the coils. The operation of such a pattern warping machine thus depends greatly on the ability of the operator to interrupt the warping process at the right times. A break that is too early will waste thread material. Too late interruption generates a malfunction during operation.

In DE 35 27 473 A1 is a method and apparatus for determining a level of feed bobbins on a spinning or twisting machine operated, wherein the diameter of the coils is scanned repeatedly. The diameter is thereby determined by moving a light barrier perpendicular to the longitudinal axis of the coils and measuring the interruption of the light barrier.

Out JP 2004185885A For example, a method of measuring a degree of filling of coils is described wherein a laser beam impinges axially on a coil and the amount of light absorbed by the coil is used as a measure for determining the degree of filling of the coil.

In the post-published EP 2 163 667 A1 It is proposed to use a sensor arrangement with which a degree of filling of coils arranged in the bobbins can be determined. As a result, the warping process can take place at a relatively high speed, it being possible at any time to obtain information about how much thread material is present on the respective bobbin.

The sensor arrangement may, for example, comprise non-contact sensors, wherein the sensors are assigned either to each coil or each coil row to a sensor which is fixedly connected to the machine frame of the rotary gate. By these sensors so the coil diameter is measured only at an axial location of the respective coil. In this case, a relatively large number of sensors are required, in particular in the case of several rows of coils.

The invention is based on the object to increase the accuracy of the measurement.

This object is achieved in a rotary gate of the type mentioned above in that the sensor arrangement has at least one sensor which is movable parallel to the axis of rotation.

By the movement of the sensor, it is possible to detect the diameter of the respective coil along the axis of rotation several times, so that a degree of filling of the coil can be determined with high accuracy. In this case, a measurement can also take place during the movement of the sensor, so that the measurement results are available in a relatively short time.

In this case, the sensor is advantageously arranged on a slide rail, which is arranged on a machine frame, on which the carrier is rotatably mounted. The movement of the sensor on the slide can be done relatively low friction and smooth, ensuring a fast and smooth movement of the sensor is guaranteed. In this case, the radial position of the sensor, ie the position perpendicular to the axis of rotation, at any time exactly defined. This contributes to the good accuracy of the measurement of the degree of filling. With the sensor arrangement, a degree of filling or a coil diameter during the movement of the sensor can thus be determined.

Preferably, the sensor is designed as a non-contact sensor, in particular as a laser sensor. The measurement of the degree of filling can therefore without mechanical Contact between the coils and the sensor done. Accordingly, no signs of wear are to be expected. The reliability and accuracy of the measurement is therefore relatively high.

The sensor is preferably arranged on the slide rail such that a laser beam strikes a surface of the coils almost perpendicularly. The term "vertical" is not to be understood in the mathematically exact sense. Rather, even small deviations are possible. These are also not completely avoid, because the carrier continues to rotate during the measurement. However, the sensor should be arranged in such an angle that the laser beam intersects the axis of rotation, that is, the laser beam is located on an extension of the radius of the rotatably mounted carrier.

The coil receptacles are preferably arranged in succession in at least two groups along the axis of rotation of the carrier, the sensor being movable from a first measuring position, which is assigned to a first group, to a second measuring position, which is assigned to a second group. Even with multiple coil groups then a single sensor for measuring the degree of filling is sufficient. Although then at least two rounds of the carrier are required to measure all coils, but this is usually sufficient, since the measurement can be done with a relatively high accuracy. Thus, it can be predicted with sufficient certainty whether the thread lying on the respective spool is still sufficient for at least two revolutions of the carrier. By using only a single sensor results in a relatively inexpensive arrangement, wherein the signal transmission can be relatively simple, since no collision can occur with signals from other sensors.

The rotary gate preferably has a housing which has openings at least in the region of the measuring positions. The housing surrounds the rotatably mounted carrier and thus protects it against external influences. A contamination of the rotary gate and the threads can be as good as excluded. The risk that, for example, an object leads to damage of the rotary gate is minimized by the housing. The sensor can be arranged outside the housing, since it can measure through the openings in the region of the measuring positions. The housing itself can thereby be arranged relatively tightly around the rotatably mounted carrier, so that not unnecessarily much space is required.

Advantageously, the sensor arrangement is connected to a machine control, which calculates a residual length of a thread on the basis of the coil diameter. The calculation of the residual length of a thread based on a measured coil diameter can be done with relatively high accuracy. The residual length of the thread corresponds to the degree of filling of the coil.

Advantageously, the machine controller stops a sample warping machine when the degree of filling is less than a desired value. As stated above, the sensor assembly is capable of determining, with sufficient reliability, the degree of filling of the spool to determine whether a spool is idling threatening. If so, the sample warper is automatically stopped. This will allow the bobbin to be replaced at exactly the right time, leaving too little thread on the bobbin. At the same time it is ensured that the bobbin does not run empty and produces a "wild thread breakage". The determination of the desired value can be determined in dependence on a pattern to be generated. This can be done, for example, by connecting the machine control to a pattern control. Since the pattern control dictates how much thread it takes to make a particular pattern, the thread stock on each bobbin can be optimally utilized. At the same time it can be ensured that a knot-free or at least knot-poor pattern chain is generated.

The object is achieved in a sample warping machine of the type mentioned above in that it has such a rotary gate.

By automatically monitoring the degree of filling of the coils in the rotary gate of the thread supply of the coils can be used well. At the same time, the risk of disruption is kept low.

The sample warping machine preferably has an insertion machine which is connected to the sensor arrangement. With the help of the placement machine, an automatic bobbin change can take place, wherein the beginning of the thread of a new bobbin is connected to the end of the thread of the empty bobbin. This requires that the end of the thread of the empty Spool is still available, so the empty spool still has a residual thread. The placement machine can then cut through this residual thread to produce a thread end that can be connected to the thread beginning of the new coil. It is thus a fully automatic production of a pattern or short chain possible.

The object is achieved in a method of the type mentioned in that a sensor for measuring the degree of filling of the coil is moved parallel to the axis of rotation.

By the movement of the sensor, it is possible to determine, for example, a diameter of the coils at a plurality of axially adjacent points. The diameter of the coils is a measure of the degree of filling or for the remaining thread length. By the movement of the sensor so a very accurate measurement can be done. In this case, adjacent coil groups can be detected, which can be done with a single sensor.

Advantageously, a measurement takes place during the movement of the sensor. So it can be done relatively quickly consecutive measurements. It is thus possible to measure the coil diameter of a coil directly at a plurality of axially adjacent measuring points without the need for several revolutions of the carrier. Thus, during one rotation of the carrier all coils of a group can be detected.

Advantageously, the sample warping machine is stopped when the degree of filling is less than a desired value. This ensures that no wild thread break occurs, but that there is always a sufficient degree of filling of the coils. As a measure of the degree of filling serves, for example, the remaining length of the thread, which is still wound on the spool. This residual length of the thread can be calculated on the basis of the coil diameter.

It is particularly preferred that the desired value is determined as a function of a pattern to be generated. The setpoint can therefore vary. This makes it possible to make the best possible use of the thread supply located on the bobbin. At the same time, nodes in the pattern length can be avoided. Accordingly, one can easily create a knot-free or knot-poor pattern chain.

Advantageously, a residual length of the thread is wound onto a central cord. This central cord, which is also called "soul", is usually used for filing the threads, if they are not stored on the warping drum. By now also the remaining lengths are wound on the center line, it is ensured that the nodes that are required to connect the one thread end to the thread end of the new coil, are wound on the center line. This ensures that a knot-free pattern chain is generated.

Fig. 1

eine schematische Seitenansicht einer Muster- kettenschärmaschine,

Fig. 2

eine Seitenansicht eines Drehgatters,

Fig. 3

eine Stirnansicht eines Drehgatters,

Fig. 4

eine Seitenansicht der Sensoranordnung und

Fig. 5

eine weitere Ansicht der Sensoranordnung.

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

Fig. 1

a schematic side view of a sample warper,

Fig. 2

a side view of a rotary gate,

Fig. 3

an end view of a rotary gate,

Fig. 4

a side view of the sensor assembly and

Fig. 5

another view of the sensor assembly.

In Fig. 1 a sample warping machine 1 is shown with a warping drum 2, wherein a plurality of conveyor belts 3 are arranged on the circumference of the warping drum 2. The conveyor belts 3 are parallel to an axis 4 of the warping drum 2. The warping drum 2 is rotatably mounted. When winding threads, however, it is blocked against rotation.

Opposite a front side of the warping drum 2, a rotary gate 5 is arranged. From the rotary gate 5 threads 6 are deducted, which can be stored with the help of yarn guides 7 on the conveyor belts 3. The yarn guides 7 can be pivoted in the axial direction of the warping drum 2 via the conveyor belts 3. In this case, the threads 6 are deposited on the conveyor belts 3. The yarn guide 7 can also be pivoted so that they are the threads 6 on a Place middle cord 8, which runs approximately in the axis 4 of the warping drum 2.

In order to store the threads on the circumference of the warping drum 2 or on the conveyor belts, the threads 6 must rotate together with the yarn guides 7 to the warping drum 2. To make this possible, the rotary gate has at least one support 9, 10, on which a plurality of coil housings 11 are arranged. In each coil receptacle 11, a coil 12, 13 are arranged. From each spool 12, 13, a thread 6 is then withdrawn and fed to a corresponding yarn guide 7.

In Fig. 2 now the rotary gate 5 is shown isolated. The rotary gate 5 has a machine frame 14, on which the carrier 9 is rotatably mounted. A rotation axis of the carrier 9 corresponds to the axis 4 of the warping drum 2. The rotary gate 5 has a housing 15, which surrounds the carrier 9 with the coils 12, 13 which are held in the coil holders 11. In the housing 15 openings 16, 17 are arranged, through which by means of a sensor arrangement 18 a degree of filling of the coils 12, 13 can be determined. The sensor arrangement 18 has at least one sensor 19, which is arranged movably on a slide rail 20. The sensor 19 is thus axially movable on the slide rail 20. The slide rail 20 is attached to the machine frame 14.

In Fig. 3 the rotary gate 5 is shown in front view. The carrier 9 has a total of 24 coil holders 11 each having a coil 12. These coil holders 11 are uniform over the circumference of the rotary gate 5 distributed. The sensor 19 of the sensor arrangement 18 is designed as a contactless laser sensor. He is attached to the slide rail 20 so that the laser beam is perpendicular to the axis of rotation of the carrier 9. This results in a measurement of the coil diameter perpendicular to the coil surface. The sensor 19 is movable on the slide rail 20 parallel to the axis of rotation, ie in the representation according to Fig. 3 out of the drawing plane. This makes it possible to measure a coil diameter at a plurality of axially adjacent positions. With the help of the coil diameter, a reliable statement about the degree of filling can be obtained.

By using only one sensor 19, it is necessary for the detection of the coil diameter of all coils 12 of a coil group that a complete revolution of the carrier 9 takes place. In the case of several coil groups arranged axially one after the other, several revolutions are accordingly required, since the sensor 19 has to be moved to the next coil group in each case. In general, however, it is not necessary to have the information about the degree of filling of each coil permanently available. Rather, it is sufficient to detect each revolution or every second or third revolution, the degree of filling, especially as is usually known by the pattern control, how much thread should have been consumed. Likewise, the still required residual length of the thread is known by the pattern control in the rule, so that optionally a preferred bobbin change can take place. This will ensure that a knot-free pattern string is created.

In Fig. 4 the sensor arrangement 18 is shown isolated. The sensor 19 is arranged movable on the slide rail 20. The slide rail 20 is mounted on an angle 21, which is connectable via a mounting geometry 22 with the machine frame 14. The sensor assembly 18 can thus be easily attached to existing rotary creel 5, since no further adaptation of the rotary gate 5 is required. The angle piece 21 serves to arrange the sensor 19 in an angular position in which its laser beam can impinge perpendicularly on surfaces of the coils. In the present example, the laser is arranged at a 60 ° angle to a vertical. This makes it possible to place the sensor arrangement relatively far down. It is not necessary to arrange them directly at the height of the axis of rotation of the carrier 9. This is particularly advantageous in terms of better accessibility.

Between the sensor 19 and the slide rail 20, a connecting piece 23 is still arranged, which is fixedly connected to the sensor 19 and for example serves as a compensation element. At the same time, the connector 23 may have damping properties to dampen vibrations and thus increase the accuracy of the measurement.

In Fig. 5 a further view of the sensor assembly 19 is shown. It can be seen that at each end of the slide rail 20, an angle 21 is arranged. As a result, a secure attachment of the slide rail on the machine frame 14 is possible. The possible travel of the sensor 19, by the length of the slide rail 20th is set is selected so that the sensor can detect multiple axially adjacent coil groups. The measurement can then take place at full speed of the sensor 19. On the basis of the measured coil diameter, a degree of filling or a residual length of a wound on the coil tape can be calculated. Upon reaching a predetermined diameter limit or if the filling level is less than a target value, the sample warping machine is stopped. The respective coil can then be displayed, for example. It is also possible to transmit the position of the coil to a placement machine which performs an automatic exchange of the coil. By using the sensor arrangement, the degree of filling of the coils can also be determined reliably during operation of the sample warping machine. An emptying of the coils and thus losing the thread end in the pattern chain is almost impossible. By monitoring the degree of filling by means of a sensor which is movable parallel to the axis of rotation of the carrier of the rotary gate, a coil diameter of the coils can be determined very accurately and thus an available residual length of the thread can be predicted very accurately. This makes it possible to use the available thread length of the respective coil as well as possible. At the same time it is ensured that a thread end is not lost in the pattern chain, so that an automatic assembly with a placement machine is possible.

Claims (15)

1. Rotating creel (5) of a sample warping machine (1), having a carrier (9, 10) which is mounted in a rotatable manner about a rotation axis and on which a plurality of bobbin holders (11) are arranged, wherein there is provided a sensor arrangement (18), with which the degree of filling and thus a residual thread length of bobbins (12, 13) arranged in the bobbin holders (11) can be determined, wherein the sensor arrangement (18) has at least one sensor (19) which can be moved parallel to the rotation axis.
2. Rotating creel according to Claim 1, characterized in that the sensor (19) is arranged on a sliding rail (20) which is arranged on a machine frame (14) on which the carrier (9, 10) is mounted in a rotatable manner.
3. Rotating creel according to Claim 1 or Claim 2, characterized in that the sensor (19) is formed as a sensor that functions in a contactless manner, in particular as a laser sensor.
4. Rotating creel according to Claim 2, characterized in that the sensor is formed as a laser sensor and is arranged on the sliding rail (20) such that a laser beam strikes a surface of the bobbins (12, 13) in a virtually perpendicular manner.
5. Rotating creel according to one of Claims 1 to 4, characterized in that the bobbin holders (11) are arranged in succession in at least two groups along the rotation axis of the carrier (9, 10), wherein the sensor (19) can be moved from a first measuring position, which is associated with a first group, to a second measuring position, which is associated with a second group.
6. Rotating creel according to one of Claims 1 to 5, characterized in that the rotating creel (5) has a housing (15) which has openings (16, 17) at least in the region of the measuring positions.
7. Rotating creel according to one of Claims 1 to 6, characterized in that the sensor arrangement (18) is connected to a machine controller, which calculates a residual length of a thread on the basis of the bobbin diameter.
8. Rotating creel according to Claim 7, characterized in that the machine controller stops a sample warping machine (1) when a degree of filling of the bobbins (12, 13) is lower than a setpoint value.
9. Sample warping machine (1) having a warping drum (2), thread guides (7), which can be rotated about the axis (4) of the warping drum, and a rotating creel (5) according to one of Claims 1 to 8.
10. Sample warping machine according to Claim 9, characterized in that it has an automatic placement machine which is connected to the sensor arrangement (18).
11. Method for measuring a degree of filling and thus a residual thread length of bobbins (12, 13) in a sample warping machine (1), wherein the bobbins (12, 13) are arranged in bobbin holders (11) on a carrier (9, 10) which is mounted in a rotatable manner about a rotation axis, wherein a sensor (19) for measuring the degree of filling is moved parallel to the rotation axis.
12. Method according to Claim 11, characterized in that a measurement takes place during the movement of the sensor (19).
13. Method according to either of Claims 11 and 12, characterized in that the sample warping machine (1) is stopped when the degree of filling is lower than a setpoint value.
14. Method according to Claim 13, characterized in that the setpoint value is determined in a manner depending on a sample to be produced.
15. Method according to one of Claims 11 to 14, characterized in that a residual length of the thread (6) is wound up on a central cord (8).

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