JPH0899771A - Method and device for avoiding ribbon binding - Google Patents

Abstract

PURPOSE: To prevent ribbon winding by making a drive motor of a drive drum act as a moment adjuster unit so as to generate a slip to be changed, so as to prevent a match in a rotary speed ratio between the drive drum and a drive packaged. CONSTITUTION: Current setting is performed in connection with target value setting of current for a current regulator, for example, the diameter and the weight of a twill package, the length of a wound yarn and the peripheral speed of the twill package 3 by a winding station computer so as to apply positive or negative acceleration fitted to the revolution passage to the drive motor 10. The current is directly proportional to torque to be generated, and this means moment setting. Therefore, the twill package follows the drive drum 2 with the control slip, and the slip effectively prevents ribbon winding.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for avoiding ribbon winding when winding a traverse package, wherein the traverse package is driven by a driving drum having a reverse thread groove for guiding a yarn, The peripheral speed of the driving drum is constantly changing, the twill winding package is accelerated by the driving drum, and the movement of the driving drum is followed with a slip,
A winding computer of the type in which the speed of the drive motor of the drive drum is controlled, and an apparatus for carrying out the method.

[0002]

2. Description of the Related Art During winding of a traverse package, a ribbon is wound on the traverse package at a specific rotational speed ratio between the drive drum and the traverse package of the traverse package within a specific diameter range of the traverse package. May cause
In this case, the yarn is fed at a high speed into a narrow area around the twill package, which has a considerable adverse effect on the winding process of the twill package.

For example, German Patent Publication No. 370.
A method and a device for avoiding ribbon winding is known from the publication 3869A1. Intermittent slippage occurs between the drive drum and the traverse package to avoid ribbon winding. The drum speed is first increased to a predetermined value. When the drum speed reaches a predetermined value, the drive is shut off and the traverse package and drive drum slow down to a predetermined low speed. Such deceleration is related to mechanical conditions such as bearing friction and package mass. The deceleration characteristics are significantly defined by the inertial mass and load moment of the device. Due to the deviation of the electrical or mechanical parameters, the disturbing effect (Stoerwir-kung) also changes, ie the ribbon winding disturbing cycle is not constant.

German Patent Publication No. 391 of the Federal Republic of Germany
A method and device for avoiding ribbon winding is known from 6918A1. The drive drum of the Aya winding package is accelerated and braked by the drive unit in accordance with a predefinable periodic action, so that the Aya winding package follows the movement of the drive drum in phase, i.e. with slip. To do. The amplitude or frequency of the periodic action is changed in relation to the increase in the diameter of the twill package during the package winding process.

According to known methods, the rotational speed of the drive drum is adjusted between a minimum rotational speed and a maximum rotational speed. The disturbance effect is defined by the predetermined periodicity of the change in the rotational speed of the drive motor. At the same slip in the accelerating phase and the braking phase of the twill package, there is a risk that the yarn will be wound on the twill package in parallel.

[0006]

SUMMARY OF THE INVENTION The object of the invention is to further improve the disturbing effect used in the prevention of ribbon winding in the method mentioned at the outset.

[0007]

In order to achieve the object of the invention, in the method according to the invention, the drive drum is driven by a motor, which acts in a control-technical manner as a moment adjuster, and in a current regulator by a winding computer. By setting the target value of the electric current, the drive drum is accelerated by a pre-selectable constant moment and braked by another pre-selectable constant moment, so that between the Ayaki package and the drive drum, A varying slip is produced so that the matching of the rotational speed ratio of the drive drum and the drive package, which causes ribbon winding, is avoided. Furthermore, in the configuration according to the invention, the drive motor of the drive drum is a motor that acts as a moment adjuster in terms of control technology.

[0008]

Advantages of the invention The drive drum is controllable.
driven by a motor acting as a momentum regulator. Such a motor may be a three-phase synchronous motor with electronic commutation. The advantage of such a motor lies in the characteristic of control technology as a pure moment adjuster. Thereby, the acceleration and braking moments of the drive drum can be adjusted according to the invention. The slip that occurs between the drive drum and the traverse package does not depend on when the motor is working and produces a well controllable jamming effect. The moment setting defines the resulting slip.

The winding computer sets the target value of the current for the drive motor current regulator. With such a target value setting, the instant working point of the drive motor is clear. Parameters related to such work points and causing ribbon winding of a twill package,
To provide the drive motor with a positive or negative acceleration adapted to the number of revolutions, for example in relation to the traverse package diameter, the traverse package weight, the already wound yarn length and the peripheral speed of the traverse package. The current setting is performed. This causes the traverse package to follow the drive drum with a controlled slip, which effectively obstructs (prevents) ribbon winding. The winding computer provides a current setpoint for the drive motor current regulator, i.e. the final stage, such current being directly proportional to the torque produced, which means a moment setting. . This makes it possible to influence the winding process in an advantageous manner.

According to the invention, the winding computer sets the target value of the current in the current regulator, so that the drive drum is accelerated with a preselectable constant moment and another preselectable constant moment. Is braked at. In setting the current, the winding computer takes into account, according to the working program, all the parameters which are important for the winding program, for example the package mass, the crimping force of the package, the package diameter and the coefficient of friction of the yarn.

In the past, the braking characteristics of the device have been defined by the inertia of the mass and the existing load moment, whereas in accordance with the invention a torque is generated which is opposite to the load moment in the braking phase, and this torque causes the load It is possible to control the moments to offset more or less. This can have a strong influence on the braking stage.

According to the invention, it is possible to reduce the slip between the drive drum and the traverse package during the braking phase to the minimum physically possible to produce a preselected braking action for the traverse package. It is possible. Such a slip minimum does not actually exist compared to the slip in the acceleration phase. In order to achieve such a situation, the constant value of deceleration in the braking phase must not exceed the limit value that causes noticeable slip. The deceleration tilt angle is changed in relation to the limit value, but in this case the slip is roughly unchanged. Limit values are various control factors,
For example, it is related to the coefficient of friction of the yarn to be wound, the crimping force of the package on the drive drum, and the inertial force based on the winding amount of the package. According to the invention, the respective lengths of the acceleration phase or the braking phase, the cycle times and the amplitudes with reference to the average peripheral speed of the drive drum during the winding stroke are chosen within wide limits, which results in a ribbon winding disturbance. Can be optimized.

[0013]

EXAMPLE The time-speed diagram of FIG. 1 shows the course of the peripheral speed V of the drive drum and the peripheral speed v of the twill winding package. In this case, the speed of the drive drum is the maximum peripheral speed Vmax and the minimum peripheral speed vmax. It vibrates with the same amplitude centering on the average peripheral velocity Vmit between the peripheral velocity Vmin.

By setting the moment in the acceleration stage A, the drive drum is accelerated from the lower turning point Vmin with a constant moment. With a slight delay, the Aya winding package follows the driving drum from the lower turning point, and the Ay winding package reaches the peripheral speed vu at the turning point. The Aya winding package tries to follow the driving drum at the same speed, but due to the inertia of the Aya winding package, a speed difference remains between the peripheral speed V of the driving drum and the peripheral speed v of the Aya winding package. Such a speed difference is called slip S. Such slip changes as the speed of the drive drum changes. While the drive drum has already exceeded the maximum peripheral speed Vmax, the turning point Vo on the upper side of the twill winding package is achieved with a corresponding delay, from which the peripheral speed of the twill winding package rotates. It also decreases as the number decreases.

The peripheral speed of the driving drum is the upper limit value Vma.
When x is reached, another constant braking moment is produced. The choice of braking moment influences the rotational characteristics of the twill package via the drive drum. As shown, the Aya winding package then follows the drive drum with little slippage. Therefore, the risk of overlapping parallel windings due to symmetrical slip motions is avoided. In order to make it easier to see the course of the characteristic curve, the slip in the range of zero during the braking phase is shown amplified.

It should be especially taken into consideration that, in almost the same slip between the acceleration stage and the braking stage, the rotational speed ratio between the drive drum and the package sways around the average value, and the ribbon winding is not sufficiently suppressed. On the contrary, the slippage between the acceleration phase and the braking phase has the advantage that the previously mentioned dangerous rotational speed ratio is virtually always largely displaced from the ribbon winding area.

During the braking phase, the slip is negligibly small and the rotational speed ratio between the drive drum and the traverse package does not change. At this point, the actual peripheral speed of the traverse package can be defined, and the traverse package diameter is calculated from this peripheral speed. The traverse package diameter can also be determined from the winding position of the package holder relative to the reference position by another method.

In the time-velocity diagram shown in FIG. 2, successive acceleration and braking phases are of different lengths and each cycle is repeated by three successive acceleration and braking phases. Continuing acceleration phase A
1, A2, A3 are shortened in sequence, and the braking phase B is also the same.
1, B2 and B3 are also getting shorter. Braking stage B3
After, the cycle represented by the initial acceleration phase A1 is repeated.

In the time / velocity diagram shown in FIG. 3, not only are consecutive acceleration and braking stages of different lengths, but also the average peripheral velocity Vmit of the drive drum.
The amplitudes of the peripheral velocities that oscillate around the center of the circle also differ, and the peripheral velocities vary between two limit values of different amplitudes.
At the acceleration stage A1, the Ayaki package has the lower turning point Vu1.
To the upper turning point Vo1. In this case, the rotation speed of the drive drum increases from Vmin1 to Vmax1. In the first braking phase B1, the twill winding package is braked to a peripheral speed Vu2 below Vu1 by a preselected moment. The rotation speed of the driving drum is Vmin
Reduces to 2. The next acceleration stage A1 is of the same length as the preceding acceleration stage, but in this case the twill winding package is accelerated to the peripheral speed Vo2 and the drive drum reaches the peripheral speed Vmax2. The braking phase B2 is longer than the preceding braking phase and the twill winding package is again braked to the peripheral speed of the lower turning point Vu1. The driving drum reaches the peripheral speed Vmin1 by the braking moment produced. Then, the aforementioned braking and acceleration cycle is newly repeated.

In the time / speed diagram shown in FIG. 4, the current target value setting for the current regulator uses a random generator to average the drive drum between two limit values Vmax and Vmin. It is done to change the circumferential speed and all amplitudes are possible. Furthermore, the braking phase and the acceleration phase are optional.

The four diagrams show alternative embodiments of how to avoid ribbon winding by intentionally acting on the winding of a twill winding package. By setting an appropriate target value of the current in the current regulator, the drive drum is accelerated at any preselectable constant moment and at any preselectable other constant moment, as shown in the diagram. Is braked.

FIG. 5 diagrammatically shows a known construction of a winding device for the winding part (Spulstelle) of a winder, which is not shown in detail. A twill winding package 3 is mounted on the drive drum 2 of the winding unit 1. The drive drum is composed of a winding shaft, and the yarn 4 coming from a pay-out bobbin (not shown) is supplied to the peripheral surface 6 of the yarn winding package 3 by the groove 4 of the winding shaft, and the yarn is wound around the yarn. Form the layer 7. The sleeve 8 of the Aya winding package 3 is held in a package frame 9. The drive drum 2 is driven by a drive motor (three-phase synchronous motor with electronic commutation) 10. The drive drum 2 is directly attached to the extended rotor shaft 11 of the drive motor 10.

A control unit (winding unit computer) is provided for controlling the winding unit, and the control unit is connected to the database 14 via the connection unit 13. Is connected to all winding computers, not shown, and the database leads to a central control unit (not shown) of the winder.
A three-phase synchronous motor 10 for driving the drive drum 2 is connected via a control passage 15 to a winding section computer 12 for setting a current target value. The speed / actual values are transmitted via the signal path 16 to the winding computer by scanning an oscillator in the motor, for example a magnetic pole wheel.

The winding unit computer 12 is further connected with another oscillator, for example, an oscillator 17 for detecting the position of the package frame 9 when the diameter of the twill package 3 is increased. This transmitter may be, for example, a potentiometer. The oscillator 17 is connected to the winding section computer 12 via a signal path 18. Another oscillator 19 is used to detect the actual package speed.
The transmitter 19 may be composed of, for example, a magnetic pole wheel, and the number of rotations per unit time is obtained from the signal sequence of the magnetic pole wheel.
This transmitter is connected to the winding computer 12 via a signal path 20.

The thread 5 passes through the cleaner 22, and then the driving drum (winding shaft) 2 through the thread guide eye 21.
Reach The sensor 23 is used to check the yarn quality and a signal is sent to the winding part computer 12 via a signal path 24. When the detected yarn quality deviates from the predetermined standard, the cutting device 26 is operated via the signal passage 25,
In a subsequent known operation, not shown, the defective yarn portion unwound from the twill package is cut off.

FIG. 6 shows a block circuit of the motor drive section of the drive drum 2. In the drive motor (three-phase synchronous motor with electronic commutation) 10, the current regulator (final stage) 102 is provided before the original motor drive unit 101.
Is connected. Package speed is provided to the winding computer 12 via a database 14 from a central control unit (not shown) of the winder. On the basis of this, the winding computer 12 gives a signal via the control channel 15 to the current regulator 102 for adjusting the current target value. Based on the response of the rotor position via the rotor position transmitter 103, the corresponding stator winding is controlled by the final stage. Rotor position transmitter 103
Is attached to the rotor shaft 11, and the drive drum 2 is attached to an extension of the rotor shaft. The rotor position transmitter 103 may consist of a Hall sensor. The signal of the rotor position transmitter is sent to the current regulator 102 via the signal path 104, and the current regulator controls the individual stator windings via the signal path 105 based on the signal.

In order to measure the actual motor rotational speed, and thus the actual speed of the driving drum 2, a rotational speed measuring device, for example, a magnetic pole wheel is attached to the rotor shaft 11, the magnetic pole wheel is scanned, and its signal is signaled. It is sent via the passage 16 to the winding computer for setting the current target.

FIG. 7 shows a circuit of a three-phase synchronous motor (drive motor 10) with electronic commutation,
In this case, the commutation of the motor drive unit 110 is performed by the monitoring unit of the voltage profile induced in the winding that is not just flowing.

The winding computer 12 supplies the desired rotational speed value to the final stage 111 via the control path 15, which controls the current distribution to the individual stator windings via the signal path 112. In response to this, a response of the induced voltage profile in the stator winding, in which no current is flowing, is performed via the signal path 113. On the basis of such a response via the signal path 113, for example towards the microprocessor 114 in the final stage 111, the detection of the rotor position and thus the necessary distribution of the current to the individual stator windings takes place. At the same time, the rotational speed of the motor is detected by means of the microprocessor 114 and sent via the signal path 16 to the winding computer. In addition, the distribution of current to the individual stator windings is controlled via the signal path 115.

[Brief description of drawings]

[Fig. 1] Time-speed diagram of constant frequency and amplitude with acceleration phase shorter than braking phase

[Fig. 2] Time / speed diaphragm with constant amplitude and tilt angle that changes during acceleration and braking.

FIG. 3 is a time / velocity diaphragm with a tilt angle and a varying amplitude that change both during acceleration and braking.

FIG. 4 Time-Velocity Diaphragm of Periodic Change Generated by Random Generator

FIG. 5 is a schematic view of a winding device.

FIG. 6 is a block circuit diagram of a motor drive unit including a sensor type monitoring unit for the drive drum position.

FIG. 7 is a block circuit diagram of a motor drive unit including a rotor position detection device based on rotor-induced voltage.

[Explanation of symbols]

2 Drive drum, 3 Aya winding package, 4
Groove, 5 threads, 6 circumferential surface, 7 thread layers, 8
Sleeve, 9 package frame, 10 drive motor, 11 rotor shaft, 12 winding computer, 13 connection part, 14 database,
15 control passages, 16 signal passages, 17 transmitters, 18 signal passages, 19 transmitters, 20
Signal passage, 21 thread guide eye, 22 cleaner, 23 sensor, 24, 25 signal passage, 26 cutting device, 102 current regulator,
103 roller position transmitter, 104, 105
Signal passage

Claims (8)

[Claims] 1. A method for avoiding ribbon winding during winding of a traverse package, wherein the traverse package is driven by a drive drum having a reverse thread groove for guiding a yarn, and a peripheral speed of the drive drum is controlled. In the type that constantly changes, the traverse package is accelerated by the drive drum, and follows the movement of the drive drum with slip, and the winding unit computer controls the rotation speed of the drive motor of the drive drum. The drum is driven by a motor that acts technically as a moment adjuster, and the winding computer sets the target value of the current in the current regulator to accelerate the drive drum with a preselected constant moment and Braking with another constant moment of choice, which drives the Aya winding package Method for avoiding ribbon winding, characterized in that it causes a varying slip, such that a matching of the rotational speed ratio of the drive drum and the drive package between the drum and the drum is avoided. 2. The method of claim 1, wherein the braking moment is selected such that the traverse package rotates with the drive drum at least substantially without slip. 3. The driving drum is driven by a three-phase synchronous motor with electronic commutation.
The method described. 4. The time is set via the winding computer as constant values for the acceleration phase and the braking phase, respectively, for acceleration and braking in relation to the upper and lower limits of the package speed. 4. The method according to claim 1, wherein the inclination angle is calculated and the target values of the currents for acceleration and braking of the driving drum are set, respectively. 5. The number of revolutions of the traverse package and the number of revolutions of the drive drum are continuously measured and compared with each other by a winding unit computer, and the traverse is performed in a braking stage where the revolution ratio does not change based on avoidance of slip. 5. The method according to claim 2, wherein the diameter of the package is defined and the target value of the current is set in the acceleration stage and the braking stage based on the diameter. 6. A device for avoiding ribbon winding when winding a twill package, comprising a drive drum as a driving part of the twill package and having a reversing thread groove of a yarn guide for supplying a yarn. A drive motor for the drive drum (2) of the type used, which is provided with a winder computer and in which the rotation speed of the drive motor of the drive drum is controlled by the winder computer. Device for avoiding ribbon winding, characterized in that (10) is a motor acting as a moment adjuster in control technology. 7. A drive motor (10) for the drive drum (2).
Is a three-phase synchronous motor with electronic commutation, and the winding part computer (12) for setting the target value of the current of the drive motor (10) for adjusting the rotational speed of the drive drum (2). 7. Device according to claim 6, which is operatively connected to a current regulator (102, 111). 8. A sensor (17, 19) is provided for measuring the actual value data of the twill winding package (3) to be formed, said sensor (17, 19) for processing the measured value and 8. Device according to claim 6 or 7, which is connected to the winding computer (12) for influencing the setpoint value of the current in the current regulator (102, 111).