EP1460156A2 - Sectional warper and method for producing a warp on a sectional warper - Google Patents

Abstract

The band winding machine has a sliding carriage (5) for feeding the band to make a winding (14) on the drum (2). It has a guide rail running parallel to the axis (6) of the drum and has a frustum of a cone (3) on the end of the cylindrical drum to guide winding of the tape. The cone expands outward from the end of the drum. The band is wound onto the drum to make a winding with a sloping surface parallel to the cone and a cylindrical surface (18) parallel to the surface of the drum (19). The carriage incorporates a control circuit (C) and a pair of parallel alignment sensors (A,B).

Description

The invention relates to a cone warping machine with a warping drum and a thread guide arrangement, the warping drum having a cone and the thread guide arrangement in operation by a drive which has a control device, is displaceable parallel to the axis of the warping drum and the warping drum is a band of threads feeds that form a winding on the circumference of the warping drum. The invention further relates to a method for producing a chain on a cone warping machine, in which several threads in the form of a tape are wound parallel to one another on the circumference of a warping drum, the tape being guided up a cone.

Cone warping machines are used to produce a chain, as required for weaving or warp knitting. The threads that later form the chain cannot all be fed at the same time. The chain is therefore divided into several sections, each section having a certain number of threads which are wound simultaneously in the form of a band. When the required number of turns of the tape has been applied to the warping drum, the warping process is interrupted and the threads are returned to the surface of the warping drum from the outer circumference of the roll that has formed on the warping drum, but by the width of the tape already formed winding axially offset.

So that the threads keep a stable position when winding on the warping drum, you can not simply wind the threads one above the other in the radial direction, but instead you move the threads a small distance axially with each revolution, so that a cone is formed on the end face of the winding being formed forms. The threads are offset by a thread guide arrangement, which is also referred to as a "reed". In operation, the warping drum turns and pulls the threads on it. When winding a ribbon, the reed is usually moved relative to the stationary warping drum. In principle, other possibilities of movement are conceivable. After a tape has been completely wound, the warping drum is moved to create the same starting positions for the reed.

The control of the movement of the reed relative to the warping drum is often carried out in such a way that the diameter of the winding being formed is continuously checked in the region of the band to be wound up. This increase in diameter must be in a fixed ratio to the number of windings wound. In order to be able to control the warping process with the aid of diameter monitoring, however, some inputs are required before the warping, for example the thickness or the diameter of the threads to be warmed.

The invention has for its object to simplify the control of the cone warping machine.

This object is achieved in a cone warping machine of the type mentioned at the outset in that the control device is connected to a parallelism measuring device which checks the circumference of the winding in the area of the belt for parallelism to the outer surface of the warping drum and controls the drive as a function of deviations from parallelism ,

With this configuration, the cone warping machine monitors itself during the warping, so to speak. At the beginning of the winding of a band, the threads are deposited on the surface of the warping drum. For the first layers of the winding, it can be assumed that the surface of the winding that forms is parallel to the surface of the warping drum. It can now happen that the drive does not control the thread guide arrangement at the required speed. If the drive sets too fast a propulsion, then the belt is guided too quickly up the cone, which is arranged on the warping drum. In this case, the peripheral surface of the winding that is formed no longer remains parallel to the peripheral surface of the warping drum. Rather, this circumference tilts in a direction that the inclination of the cone equivalent. The angle of inclination is of course much smaller. However, the "inclined position" of the peripheral surface of the winding means that the wound threads are not all in the same tension, which can later lead to difficulties when unwinding or rearranging. If, on the other hand, the advance is too slow, the circumferential surface of the winding that is being formed will also incline. This inclination is then opposite to the inclination of the cone. Here too there are difficulties with the thread tension later. If, on the other hand, you monitor that the surface of the winding is parallel to the surface of the warping drum, you can readjust the drive of the thread guide arrangement when differences occur, i.e. you can drive faster or slower, so that there is actually a winding with a parallel surface. This is a relatively simple measure. Entries about thread thickness or diameter or the like are not absolutely necessary. Rather, it can be concluded with great reliability from the winding that is being formed that the speed at which the thread guide arrangement must be moved relative to the warping drum.

The parallelism measuring device preferably has at least two position measuring devices which determine a radial position of the circumference of the winding at different axial positions in the area of the belt, the control device controlling the drive as a function of a difference between the radial positions. Ideally, the two radial positions are the same. In this case, the surface of the winding is parallel to the surface of the Warping drum. If there are differences in the radial positions, then this is a clear indication that the surface of the winding is "crooked". Depending on the sign of the difference, the drive of the thread guide arrangement can then be controlled differently, so that it moves the thread guide arrangement faster or slower relative to the warping drum.

The position measuring devices preferably determine the radial positions in the region of the edges of the band. The largest "measuring section" is thus available in the axial direction. Measuring points which are arranged in the region of the edges of the strip show a greater difference when the strip is skewed than measuring points which are closely adjacent. You can either use this improved resolution to use measuring devices with a lower accuracy or you can recognize an imbalance very early so that you can take countermeasures in good time.

The position measuring devices can preferably be displaced together with the thread guide arrangement. This means that separate control is no longer required to advance the position measuring devices. If you ensure that the position measuring devices and the thread guide arrangement always stay together in the same place (in relation to the warping drum), then the desired measured values are available at the point where they are needed.

It is particularly preferred that the position measuring devices are attached to the thread guide arrangement are. This is a particularly simple design. No separate axial drive is required for the position measuring devices.

The position measuring devices preferably each measure a distance between the circumference of the winding and a fixed reference radius. This makes you practically independent of the thickness of the winding that forms. The position measuring devices can be arranged outside the warping drum. The position measuring devices do not interfere with the warping operation.

The reference radii are preferably the same for all position measuring devices. This simplifies the evaluation. In principle, the output signals of the position measuring devices can be compared directly with one another without having to carry out any further conversion measures.

Alternatively or additionally, the parallelism measuring device can record warping speeds of at least two threads in the region of the two edges of the belt. As long as the surface of the winding formed is parallel, the two threads are always wound on the same diameter. So you have to have the same speed. If there is a difference in speed, this is a sign that one thread is being wound on a different diameter than the other thread. The winding speed is the same for both threads. A signal can then be obtained from the speed difference, with the aid of which the drive for the thread guide arrangement can be controlled.

The parallelism measuring device preferably works without contact. This protects the threads and reduces wear on the measuring device.

There are various options here. The parallelism measuring device can be designed, for example, as an optical measuring device. Laser measuring devices capable of measuring a distance are available on the market. Alternatively, a sonar measuring device or a capacitive measuring device can be used as the parallelism measuring device. Such measuring devices are also available on the market and work with the desired reliability.

The invention is achieved in a method of the type mentioned at the outset by checking whether the band is parallel to the outer surface of the warping drum during winding and the feed speed changes as a function of the inclination of the band to the outer surface of the warping drum.

As stated above in connection with the cone warping machine, the feed speed of the band, that is to say the lateral displacement of the threads forming the band, is correct when the threads lie parallel to the peripheral surface of the warping drum. In this case, the tape moves up the cone at the correct speed. If there is an imbalance, the feed rate must be changed. If the feed speed is too high, the front threads move up the cone too quickly and the winding gets a surface that faces the cone is inclined. If the feed speed is too slow, the surface of the reel is inclined in the other direction. By simply monitoring the parallelism of the surface of the winding being formed, the desired information for controlling the feed can be obtained.

Preferably, the tape is advanced slower towards the cone when the tape is inclined in the same direction as the cone and faster when the tape is inclined in the opposite direction. If the feed is too fast, the threads move up the cone too quickly. In this case the feed rate must be reduced. If there is a slope in the other direction, the feed rate was too slow and the feed rate must be increased.

The radial position of the surface of the roll in the region of the tape is preferably measured at at least two points. This is a relatively simple measure to determine the parallelism of the tape. It is assumed that the misalignment of a strip can be determined using the two measuring points. If the two locations have different radial positions, then it can be assumed that the surface as a whole has an inclination. If the two positions have the same radial position, then it can be assumed that the surface is parallel to the peripheral surface of the warping drum.

The warping speed of at least two threads is preferably measured in the region of the two edges of the Band. As stated above, the warping speed is also a measure from which the parallelism of the surface of the roll can be derived. All threads are wound with the same number of revolutions of the warping drum. As long as the diameters on which the threads are wound are the same, the same speed of these two threads results. If the speeds differ, this is a clear sign that one thread is being wound onto a different diameter than the other thread. In this case a correction is necessary.

The measurement is preferably carried out without contact. This applies to both the measurement of the warping speed and the measurement of the radial position of the surface. A contactless measurement does not interfere with the warping process. It protects the threads and can be carried out practically without wear.

The winding course of the first band is preferably stored and the remaining bands are warmed as a copy of the first band. This keeps the effort for controlling the feed drive of the thread guide arrangement small. If the data for the first tape from the parallelism monitoring is available when winding, it is basically no longer necessary to monitor the parallelism when winding additional tapes.

Fig. 1

eine schematische Seitenansicht einer Konusschärmaschine,

Fig. 2

eine schematische Draufsicht auf die Konusschärmaschine nach Fig. 1 im idealen Betriebszustand,

Fig. 3

die Schärmaschine nach Fig. 2 in einem ersten gestörten Zustand,

Fig. 4

die Schärmaschine nach Fig. 2 in einem zweiten gestörten Zustand,

Fig. 5

eine abgewandelte Ausführungsform und

Fig. 6

eine schematische Darstellung zur Erläuterung eines Schärvorgangs.

The invention is described below with reference to preferred embodiments in conjunction with the drawing. Show here:

Fig. 1

a schematic side view of a cone warping machine,

Fig. 2

1 shows a schematic plan view of the cone warping machine according to FIG. 1 in the ideal operating state,

Fig. 3

2 in a first disturbed state,

Fig. 4

2 in a second disturbed state,

Fig. 5

a modified embodiment and

Fig. 6

a schematic representation for explaining a warping process.

1 schematically shows a cone warping machine 1 with a warping drum 2 which has a cone 3. The warping drum 2 can be driven in rotation in the direction of an arrow 4. The drives required for this are not shown for reasons of clarity.

A thread guide arrangement 5 can be displaced parallel to the axis 6 of the warping drum, which is represented by a double arrow 7. For this purpose, a guide track 8 is arranged parallel to the axis 6 of the warping drum 2. A drive 9 interacts with the guideway 8 in order to displace the thread guide arrangement relative to the warping drum 2.

The thread guide arrangement 5 has a carriage 10 on which a reed 11 is arranged. The reed 11 has a multiplicity of lanes 12, a single thread being able to be passed through each lane, which thread is wound onto the warping drum 2 when the warping drum 2 is rotated in the direction of the arrow 4.

The cone 3 forms an angle 13 of approximately 7 ° to 15 ° with the axial direction of the warping drum 2. During a warping process, the wound threads do not want to be arranged exactly one above the other in the radial direction. This would result in the danger that the threads on the end face of a winding 14, which forms on the circumference of the warping drum 2 (see FIG. 2), could slip off the winding 14. Rather, with the help of the thread guide arrangement, each time the warping drum 2 rotates, the threads are moved a small distance in the direction of the cone 3, so that the winding 14 that forms slowly increases the cone 3 and forms an end face 15, which is also conical is. The end face 15 is aligned parallel to the surface of the cone 3. At least it should be in an ideal state.

In order to achieve this formation of the winding 14, it is necessary that the thread guide arrangement 5 is shifted at a speed parallel to the axis 6 of the warping drum 2, which is matched to the number of revolutions of the warping drum 2 and the thickness of the threads that are wound up is, so that the corresponding conical winding 14 results. The setting of the feed speed requires a considerable amount Level of experience. Even an experienced worker can make mistakes.

In order to simplify the control, two range finders A, B are now used on the thread guide arrangement. Both range finders A, B are fixedly arranged on the thread guide arrangement. However, as indicated by double arrows 16, 17, they can be adjusted in the axial direction on the thread guide arrangement. The two distance measuring devices should have a distance which essentially corresponds to the width of the winding 14, so that they can determine the distance of the peripheral surface 18 of the winding from the thread guide arrangement 5, more precisely from its carriage 10. By determining the distance, the position of the threads on the circumference of the winding 14 is determined at the same time. The distance measuring devices A, B can also be referred to as position measuring devices. The distance measuring devices A, B are connected to a control device C which controls the drive 9, as explained below, as a function of the difference in the output signals of the measuring devices A, B.

If the radial positions of the threads at the front end of the winding 14 adjacent to the cone 3 and at the rear end of the winding 14 match, then the peripheral surface 18 of the winding 14 runs parallel to the peripheral surface 19 of the warping drum 2. In this case, the feed rate is Thread guide arrangement correctly set. The winding 14 travels up the cone 3 in the desired manner.

3 shows what happens if the speed is not correct, but the thread guide arrangement 5 is moved too quickly. In this case, the winding 14 moves up the cone 3 too quickly. The surface 18 of the winding then no longer runs parallel to the circumferential surface 19 of the warping drum 2, but rather inclines, the direction of the inclination coinciding with the direction of the inclination of the cone 3. Since both the threads at the front end of the winding 14 and at rear end are wound at the same speed, it is obvious that in such an error, the threads at the front end of the winding 14 are either too tight or too long. Both lead to a source of error when unwinding or rearranging, which is undesirable.

The two range finders A, B determine this fault very quickly, however, because the distance between the thread guide arrangement 5 and the surface 18 of the winding 14 is smaller at the front end than at the rear end. The drive 9 is therefore influenced in such a way that the thread guide arrangement is moved somewhat more slowly in the direction of the cone 3. Such an intervention in the speed will of course not take place until the situation is as extreme as is shown in FIG. 3. 3 with its exaggerations only serves the purpose of explanation. Since the two distance measuring devices A, B are arranged at the greatest possible distance from one another, small diameter differences at the front and at the rear end of the winding 14 can be detected at an early stage.

FIG. 4 shows the other fault case in which the thread guide arrangement 5 has been moved too slowly in the direction of the cone 3. In this case, the surface 18 of the winding 14 is also inclined, but in the opposite direction to the inclination of the cone 3. In this case, it would be necessary to advance the thread guide arrangement faster, which is reported to the drive 9 by the two distance measuring devices can be done easily. The situation is also exaggerated in Fig. 4. One will not wait until the distance b between the distance measuring device B has become so much larger than the distance a between the surface 18 of the winding 14 and the distance measuring device A.

The distance measuring devices A, B preferably operate without contact. A particularly well-functioning distance measuring device is formed by a laser measuring device, that is to say an optical measuring device. However, it is equally possible to design the measuring device as a sonar measuring device or as a capacitive measuring device. If the two measuring devices A, B are arranged at the same distance from the axis 6 of the warping drum 2, the output signals of the two distance measuring devices A, B can be used directly and, by comparison, the parallelism of the surface 18 of the winding 14 to the surface 19 of the warping drum 2 check.

Additionally or alternatively, as shown in FIG. 5, speed measuring devices 20, 21 can be used on the thread guide arrangement 5. If the thread guide arrangement moves too slowly towards the Cone 3 has moved and a situation (also exaggerated) has occurred, as shown in FIG. 5, then the winding 14 has a smaller radius RB in the area of a thread at the front end than at the rear end RA. In this case, since the winding 14 is rotated at the same speed at the front end and at the rear end, the speed V _{B of} a thread 23 at the front end of the winding 14 is lower than the speed V _{A of} a thread 22 at the rear end of the winding 14 By comparing the speeds it is also possible to determine whether the surface 18 of the winding 14 runs parallel to the peripheral surface 19 of the warping drum 2.

In Fig. 6 it is now shown that the winding 14 forming on the warping drum 2 is composed of several partial windings 14a, 14b, 14c. Each partial wrap should have the same structure. Each partial winding is formed by winding a number of threads lying parallel to one another, a so-called ribbon, on the circumference of the warping drum 2.

It is now sufficient to apply the control described above, in which the feed speed of the thread guide arrangement 5 is controlled as a function of the parallelism of the surface 18 of the winding 14, to the first winding 14a. If one saves the winding course of this winding 14a and winds the tapes in the same way in the subsequent windings 14b, 14c, ..., then one obtains an overall wound warping drum 2 in which the surface of the winding is parallel to the surface 19 of the warping drum 2 runs.

Claims (18)

Cone warping machine with a warping drum and a thread guide arrangement, wherein the warping drum has a cone and the thread guide arrangement can be moved in operation by a drive having a control device, parallel to the axis of the warping drum, and feeds a band of threads onto the warping drum form a winding around the circumference of the warping drum, characterized in that the control device (C) is connected to a parallelism measuring device (A, B; 20, 21) which detects the circumference (18) of the winding (14) in the region of the belt Checks parallelism to the lateral surface (19) of the warping drum (2) and controls the drive (9) depending on deviations from the parallelism. Machine according to claim 1, characterized in that the parallelism measuring device (A, B) has at least two position measuring devices which determine a radial position of the circumference (18) of the winding (14) at different axial positions in the area of the belt, the control device (C) controlling the drive (9) as a function of a difference between the radial positions. Machine according to claim 1 or 2, characterized in that the position measuring devices determine the radial positions in the region of the edges of the belt. Machine according to one of claims 1 to 3, characterized in that the position measuring devices can be moved together with the thread guide arrangement (5). Machine according to claim 4, characterized in that the position measuring devices are attached to the thread guide arrangement (5). Machine according to one of claims 1 to 5, characterized in that the position measuring devices each measure a distance (a, b) between the circumference (18) of the winding (14) and a fixed reference radius. Machine according to claim 6, characterized in that the reference radii are the same for all position measuring devices. Machine according to one of claims 1 to 7, characterized in that the parallelism measuring device (20, 21) detects warping speeds (V _A , V _B ) of at least two threads in the region of the two edges of the belt. Machine according to one of claims 1 to 8, characterized in that the parallelism measuring device (A, B; 20, 21) works without contact. Machine according to claim 9, characterized in that the parallelism measuring device (A, B; 20, 21) is designed as an optical measuring device. Machine according to claim 9, characterized in that the parallelism measuring device (A, B; 20, 21) is designed as a sonar measuring device. Machine according to claim 9, characterized in that the parallelism measuring device (A, B; 20, 21) is designed as a capacitive measuring device. Method for producing a chain on a cone warping machine, in which several threads in the form of a band are wound parallel to one another on the circumference of a warping drum, the band being guided up a cone, characterized in that it is checked whether the band is parallel to the outer surface during winding the warping drum lies and the feed speed changes depending on the inclination of the belt to the outer surface of the warping drum. A method according to claim 13, characterized in that the tape is advanced towards the cone more slowly when the tape is inclined in the same direction as the cone and faster when the tape is inclined in the opposite direction. A method according to claim 13 or 14, characterized in that the radial position of the surface of the roll in the area of the tape is measured at at least two points. Method according to one of Claims 13 to 15, characterized in that the warping speed of at least two threads is measured in the region of the two edges of the belt. Method according to Claim 15 or 16, characterized in that the measurement is carried out without contact. Method according to one of claims 13 to 17, characterized in that the winding course of the first band is stored and the remaining bands are warmed as a copy of the first band.

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