JP6953452B2 - Weaving thread supply device, control method of weaving thread supply device, and computer program products - Google Patents

Description

The present disclosure relates to a weaving yarn supply device. In particular, the present disclosure is a yarn feeder suitable for rapier looms weaving flat or tape weaving yarns where weft yarns are passed to the loom without twisting. Regarding.

A common development trend in weaving is that the speed of looms is constantly increasing. Another trend is the increasing use of flat or tape-forming weaving yarns, which are to be inserted without any twist. Examples of such weaving yarns are polypropylene tapes, carbon fiber tapes, aramid and fiberglass tapes. Currently, the speed of rapier looms weaving untwisted flat or tape weaving yarns is limited by the low capacity of untwisted yarn feeders present today.

Existing systems that supply zero-twist weaving yarn typically have an un-wind motor, which is the length of a large loop buffer located between the bobbin and the loom. Is controlled by measuring. The loop buffer can be free hanging or have a mechanical member that forms the loop buffer by gravity, compressed air, or under pressure (aspirator). Existing systems can be thought of as storage feeders, where the loom can take the amount of weaving yarn it requires, the so-called "negative weaving yarn feed" or "feed on demand".

U.S. Pat. No. 5,150,739 describes a weaving buffer that tangentially unrolls weaving threads from a bobbin and supplies the weaving threads to a container in a loop. The weaving buffer is pulled out with less force during at least part of the weaving cycle compared to the force required if the weaving yarn is pulled out directly from the weaving yarn storage as it is pulled out directly from the bobbin. It is a device that can hold a small amount of weaving yarn. Loop formation is uncontrolled, but does not really depend on the properties of the weaving yarn with the risk that the resulting loops will be entangled or twisted in a non-uniform manner. In addition, the weaving loop is propelled by gravity, which limits the speed at which the loop can be made. Since the weaving loops are free and uncontrolled by either, there is a great risk that the weaving threads will be entangled or twisted. Entangled or twisted weaving threads will cause problems in weft insertion, either by stopping the machine or by reducing the quality of the fabric.

U.S. Pat. No. 3,575,217 also supplies the weaving yarn to the container in loops, in which case the loops are assisted to form under the pressure obtained by the aspirator. Nevertheless, the loop is free and is exposed to great risk of twisting or entanglement.

In US Pat. No. 3,825,198, the loop is propelled by a moving wall at the rear and by a moving wall at both the posterior and anterior walls in one run. Nevertheless, the loop is uncontrolled and is exposed to the risk of twisting or entanglement.

These devices described above are potentially operational when weaving at low speeds, but if the weft insertion speed increases, they are unable to form loops and can proceed at the required speed. It will not work anymore, as it will not be possible or the loops will be twisted or entangled.

U.S. Patent Application 2015/02039999 introduces a movable loop roller and pulls a weft to form a U-shaped loop. The movable loop roller obtains a force that tensions the weaving yarn by spring or pressure. However, the rollers have mass and the inertial mass will produce a tension peak in the weft when the weaving is accelerated during weft insertion. The device also operates at low insertion speeds, but when the loom speed increases, it causes limitations throughout the system. In addition, when the loom speed is increased, there is less time to form the loops, so it is necessary to increase the force from the movable weaving yarn rollers towards the weaving yarns during loop formation. Thus, the movable loop roller will generate even higher weaving tension during insertion, as it must overcome not only the inertial mass of the movable loop roller but also increased spring force or increased pressure. This increased weaving tension during insertion limits the speed at which the loom can operate.

There is a constant demand for improving the supply of weaving yarn to textile machinery. Therefore, there is a demand for an improved weaving yarn feeder.

U.S. Pat. No. 5,150,739 U.S. Pat. No. 3,575,217 U.S. Pat. No. 3,825,198 U.S. Patent Application 2015/0203999

An object of the present invention is to provide an improved weaving yarn supply device.

This purpose and / or other content is obtained by a weft feeding device as described in the accompanying claims.

Therefore, a weft feed device is provided to allow weaving the fabric at high speed with no twist using a rapier loom, where the control of the weft feed is of a motor driven bobbin and a motor driven loop buffer device. It is done by controlling the speed at the same time. With this weaving system, the weft will always be controlled and will not be freed. Therefore, the risk of the weaving yarn being twisted or entangled is eliminated. The motor-driven loop buffer device is driven based on pre-stored information about the speed and position of the rapier with respect to the loom angle position. The motor-driven bobbins are driven to supply the correct weft amount during each cycle of the loom. The speed of the motor-driven loop buffer device is adjusted based on the actual weaving tension. Also, the speed of the motor-driven bobbin can be adjusted based on the actual weaving thread tension. The speed of the motor-driven bobbin can be adjusted based on other parameters such as the position of the loop buffer device. Therefore, the weft supply device can supply an accurate weft amount by driving the motor-driven bobbin at an accurate speed. Motor-driven bobbins can vary in speed on demand, but the speed variation is small, typically less than 5% over the weaving cycle. Compensation for rapid speed changes in weft insertion speed caused by rapier speed changes is made by a motor-driven loop buffer device programmed to follow the weft insertion speed changes. Finally, the control system is programmed to receive the weft actual tension feedback signal. Therefore, fine tuning in the operation of the motor-driven loop buffer device is performed based on the actual feedback tension of the weaving yarn. The goal is to keep the weaving tension constant and to have no looseness in the weaving or to make the weaving tension follow a predetermined curve over the cycle of the loom. Further, the speed of the motor-driven bobbin can be controlled based on a weft actual tension signal or a similar signal such as a signal indicating the position of the loop buffer device.

According to one embodiment, a weft feeding device for feeding the weft to a loom having at least one rapier is provided, wherein the weft continuously fed to the loom has a controlled weaving tension. This weft supply device includes a motor-driven bobbin and a motor-driven loop buffer device. The weft feeder further comprises a controller for controlling the motor of the motor driven bobbin and the motor driven loop buffer device. The controller is suitable for:
-Driving the motor of a motor-driven bobbin at a certain speed to supply an essentially determined average amount of weft that the loom consumes, where the essentially determined average amount of weft is determined by the loom. Deviates less than a preset amount from the actual average amount consumed;
-Driving the motor of a motor-driven loop buffer device based on the difference between the output speed of the weaving yarn from the motor-driven bobbin and the model of the weft insertion speed in the weaving machine; and-representing the actual weft tension. Based on the signal, the motor drive of the motor-driven loop buffer device is adjusted, or, as a supplement, the motor drive of the motor-driven loop buffer device is a signal indicating the length of the weft thread inserted into the weaving machine. Can be adjusted based on.

Thereby, the weft from the bobbin can be unwound, and a weft supply device capable of supplying the weft to the rapier loom at high speed without twisting the weft can be obtained.

According to one embodiment, the motor driven loop buffer device is formed by an arm connected to the motor of the motor driven loop buffer device. The arm can be attached directly to the output shaft of the motor of the motor-driven buffer device, or can be connected to the output shaft via a gear arrangement. According to another embodiment, the motor driven loop buffer device is formed by members that move back and forth. This provides an efficient weaving buffer that can be easily controlled.

According to one embodiment, the weft insertion speed model is based on parameters that include information about the rapier position or speed with respect to the mechanical angle position of the loom, and information about the length of the pick. Information about the momentary mechanical angle position of the loom can also be transferred from the loom to the weft feeder. In addition, information about the weft pattern can be transferred to the weft feeder prior to the start of the loom. This allows for more precise control.

According to one embodiment, the controller is based on information about the placement of the loop buffer device and / or information about the operating state of at least one moving part of the motor driven loop buffer device. Suitable for driving the motor of the device. This can further improve the control of the loop buffer.

According to one embodiment, the motor of the motor-driven bobbin is suitable for unwinding the weft from the bobbin using a center drive mechanism. In another or supplementary form, the motor-driven bobbin is suitable for unwinding the weft from the bobbin using a tangential drive mechanism.

According to one embodiment, the speed of the motor of the motor-driven bobbin is adjusted based on a signal representing the actual weft tension. As a result, the average amount of weaving yarn supplied from the bobbin can be accurately controlled. In another or supplementary form, the speed of the motor of the motor-driven bobbin is adjusted based on a signal representing the position of the motor-driven loop buffer device. According to one embodiment, when a difference between the actual average amount of weaving yarn supplied from the bobbin and the actual average amount of weaving yarn consumed by the loom is detected, the controller compensates for the difference. Therefore, it is suitable for controlling the speed of the motor of a motor-driven bobbin. This allows the average amount of weaving yarn to be controlled over time so that it is always equal to the amount of weaving yarn consumed by the loom and may accumulate over time in the weaving yarn feeding system with no residual error causing malfunction. Let's go.

According to one embodiment, the controller is suitable for utilizing the circumference of the bobbin. This is especially advantageous when the bobbin is driven using a center drive.

According to one embodiment, the controller is equal to, or within a defined range, the difference between the amount of weaving yarn unwound from the bobbin and the amount of weaving yarn consumed by the loom during insertion. In addition, it is suitable for controlling the motor of a motor-driven buffering device, such as maintaining the length of the buffered weaving yarn and thereby controlling the tension of the weaving yarn. In some embodiments, the controller is a motor driven buffering device to keep the controlled weaving tension constant over the loom cycle or to make the controlled weaving tension follow a predetermined weaving tension curve. Can be suitable for controlling the motor of.

The invention also extends to the method of controlling the weft feeding device as described above, as well as the controller and computer program product for controlling the weft feeding device as described above.

FIG. 1 is a diagram illustrating a weft thread feeding device. FIG. 2a illustrates different loop buffer configurations. FIG. 2b illustrates different loop buffer configurations. FIG. 2c illustrates different loop buffer configurations. FIG. 2d illustrates different loop buffer configurations. FIG. 3 illustrates another bobbin drive. FIG. 4 is a model for explaining the control of the weft feeding device. FIG. 5 is a flow chart illustrating the different steps performed when forming the weft buffer. FIG. 6 is a diagram of the controller.

The present invention will be described in more detail by way of an unrestricted example and with respect to the accompanying drawings.

Below, weft feeders for looms will be described. In a diagram, the same reference numerals specify the same or corresponding elements throughout several diagrams. It will be appreciated that these figures are for illustration purposes only and are not any means of limiting the scope of the invention. It is also possible to combine features from different embodiments described to meet the needs of a particular implementation.

For many types of weaving yarn, twisting is not allowed to be present in the finished fabric.
A known and reliable way to achieve this is to provide a tangential unrolling of bobbins. However, the maximum possible acceleration of the bobbin will be limited due to the inertia and limited stability of the bobbin and the wound material. Moreover, as has been noticed, the increased speed of the loom will require a weft buffer located between the bobbin and the loom. Even with buffers, the demand for weft buffers will be high as the speed of the loom increases. This is due to the high acceleration and delay in the rapier operation cycle.

FIG. 1 shows a weft supply device 12 provided with a motor-driven bobbin 13 in combination with a motor-driven loop buffer device 16. In this device 12, the weft 40 is tangentially unwound from the motor-driven bobbin 13. The weft passes through a motor-driven loop buffer device 16, which is suitable for forming a weft buffer. The weft is supplied from the motor-driven buffer device 16 to the loom 10 having at least one rapier 11. The motor-driven buffer device 16 includes a weaving thread loop forming arm 22. The arm 22 is movable to form an adjustable buffer of weft threads fed to the loom 10. The operation of the arm 22 is achieved by a motor 18 connected to the arm 22. The arm can be connected to the motor via a gear arrangement. According to one embodiment, the buffer arm is mounted directly on the output shaft of the motor 18. The force sensor 29 can also be provided to detect and output a signal representing the actual weaving thread tension. In the set-up according to FIG. 1, the weft thread inserted into the loom will always have a controlled weaving thread tension. That is, there will be no slack in the weaving yarn that can be drawn into the loom. The motor 18 and the motor 14 of the motor-driven bobbin 13 can be controlled by the controller 32 as described in more detail below.

According to one embodiment, the motor-driven bobbin 13 is configured to unravel the bobbin by a center drive, as shown in FIG.

In FIG. 1, the motor-driven loop buffer device 16 comprises a single arm 22, which arm has a weft guide 30 provided therein. The weaving thread guide may be a so-called sliding type, or the weaving thread guide may be a so-called rotating type. In particular, the weft guide 30 can be provided at one end of the arm 22, while the other end of the arm is attached to the motor 18. A form as shown in FIG. 1 with a single arm 22 gives a total weft deflection angle of about 360 °.

FIG. 2a shows another embodiment of the motor driven loop buffer device 16. The motor-driven loop buffer device 16 in FIG. 2a includes a double arm 24, which has weaving thread guides 31 and 32 provided at each end of the double arm 24. In particular, the weaving yarn guides 31 and 32 are provided at each end of the double arm 24. The central portion of the double arm 24 is attached to the motor 18. In particular, the central portion thereof can be directly attached to the shaft of the motor 18. The double arm 24 can be controlled with better dynamic characteristics compared to a single arm. However, the drawback of the double arm form is that the total deflection angles of the weft 40s are larger, about 720 °.

Another alternative motor driven loop buffer device 16 is shown in FIG. 2b. The motor-driven loop buffer device 16 in FIG. 2b includes a single arm 26 in two directions. The bidirectional single arm 26 comprises a double weft guide 34 that carries the weft in both directions, eg, past the center line with respect to the weft 40, upwards and downwards. The center line constitutes a neutral position for the buffer formed by the motor-driven loop buffer device 16. As it travels through the neutral position, the weft buffer formed by the motor-driven loop buffer device 16 changes from yarn let-out to weft take-up with a low power input.

In another embodiment shown in FIG. 2c, the bobbin is placed so that the weaving yarn advancing to the arm first advances away from the loom, resulting in a total deflection angle well less than 360 °. .. It can be as small as about 180 °.

In yet another embodiment, the motor driven loop buffer is formed by members driven forward and backward along the path. In particular, the member can be driven forward and backward along a straight path.

Another motor-driven bobbin 13 is shown in FIG. In FIG. 3, the bobbin 13 is unwound using a tangential drive in which the drive member 15 of the motor 14 is placed outside the bobbin 13. Tangent drive has the advantage that the rotational speed is linear to the unrolling speed, and the bobbin diameter does not affect the unrolling speed of the weaving yarn.

When controlling the weft supply device 12, the controller 32 can be used as described above. The controller can provide control data for controlling the motor drive speed and operation of the motor-driven loop buffer device 16. By controlling the motor-driven bobbin 13 and the motor-driven loop buffer device 16, the weft can be accurately supplied to the loom at a high weaving speed.

The input to the controller, according to one embodiment, can be: That is,
-A signal that indicates the state of the loom. This signal may be, for example, a pattern or other signal representing an event or action on the loom that can affect the actual position (mechanical angle, mechanical encoder position), pre-start, speed increase, weft insertion speed. Can be represented.
-Signal from the motor that drives the bobbin. This signal can be, for example, a signal representing the position and / or speed of the motor, such as a signal from a rotation / angle sensor such as an encoder. Other signals that indicate the state of the motor may also be available.
-Signals from the arm motors that form the loop. This signal can be, for example, a signal representing the position and / or speed of the motor, such as a signal from a rotation / angle sensor such as an encoder. Other signals that indicate the state of the motor may also be available.
-A signal indicating the current (actual) weft tension, such as a signal from a force sensor.
-A signal that represents the (actual) bobbin circumference at the moment.
-Parameter Ps that describe the special mechanism, such as the length of the arm forming the loop, the position of the weft guide, the loom setting, the position of the rapier with respect to the machine angle position, etc. In particular, a reference table for the position of the rapier with respect to the loom angle position can be provided. From such a reference table, the desired insertion speed of the weft into the loom can be estimated based on the actual weaving machine angle. This allows the arm to be controlled to a position where it is possible to supply the loom with an accurate amount of weaving yarn at the corresponding machine angle.

Speed / position control signals can be output from the controller to the arm motor and bobbin unraveling motor that form the loop.

FIG. 4 shows a description of the control system as described above.

The controller of the control system can be programmed by the angular position curve of the rapier operation, according to one embodiment. Before the machine starts, the controller can be supplied with information about the loom speed, increase and start position. During operation, the controller obtains information about the machine position, for example by means of a machine angle sensor (encoder).

The controller is programmed to operate the bobbin unwinding motor at or near the speed at which the average amount of weft consumed by the loom is unwound from the bobbin. At the same time, the controller activates the motor of the arm forming the loop so that the movement of the arm compensates for the difference between the essentially constant unwinding speed of the weft from the bobbin and the intermittent consumption of the weft by the loom. Programmed in. In general, the motor of a motor-driven buffering device buffers a buffer that is equal to or around the difference between the amount of weaving thread unwound from the bobbin and the amount of weaving thread consumed by the loom during insertion. It maintains the length of the weaving yarn, thereby driving it to control the tension of the weaving yarn. The goal of the control system, according to one embodiment, may be to follow a weaving tension curve that has or varies from weaving tension over the loom cycle. In another or supplementary form, the speed of the motor of the motor-driven bobbin is adjusted based on another input signal other than the signal representing the actual weaving tension. For example, a signal indicating the position of the motor-driven loop buffer device is available, or another signal is available indicating when the bobbin is unwound at a speed consistent with the average weaving yarn consumption. A signal indicating a cumulative error in the amount of weaving yarn supplied to the loom can also be used. This allows the error compensated by the weaving buffer to be recovered and the weaving buffer to be returned to the neutral position.

Force sensors that detect weaving tension give feedback to the control system to correct the error between expected and actual consumption in the weaving machine, both average and between actual insertions. Can be used for. The control system can also be programmed based on the feedback signal from the force sensor to correct the error between the expected and actual amount of weaving yarn unwound from the bobbin.

In a mechanism in which the bobbin is driven around its central axis, the control output signal can be rpm. However, this is a parameter to be controlled, the unraveled weft length / unit time, eg m / s. Therefore, it is important to know the actual circumference of the bobbin. This is especially important when starting the system. To obtain this information, for example, a sensor that measures the diameter of the bobbin is used, or it can be manually entered into the control system at start-up as one of the parameters P, or some other method. Can be used.

The motor of the weft feeder can be controlled by the following rules. That is, the controller for controlling the motor that operates the arm forming the loop has a preset value for the required buffer position with respect to the loom angle. The controller is also given information about the operating state of the system. When the loom is operating, the motor-driven loop forming arm will be controlled to operate accordingly in order to keep the buffer arm in the proper position at all loom angles and loom speeds. The force sensor can provide feedback to the control system, thus correcting deviations such as external influences and dynamic model defaults or actual operating errors.

A one-sided rapier machine can be used to typically weave flat tape yarns. This avoids the problem of speed shifts in transport. Also, the start of the pick is even slower, as the rapier has not reached high speed before the rapier picks up the weave.

When bilateral rapier machines are used, speed shifts in transfer can be mitigated by using additional weaving buffers. Additional buffers can include mechanical elements or spring urging members. In FIG. 2d, the mechanism has an additional weaving buffer 36. An additional weaving buffer 36 is formed here with the sensor 29, which is somewhat elastic and allows for deviations in weaving length. The amount of buffered weaving yarn is typically very small, as the rate change on transfer is short-lived. According to one embodiment, the length of the additional buffer is less than 10% of the maximum buffer of the motor driven loop buffer device 16 and is up to 1 or 2 dm and the like. Also, for one-sided rapiers, a small additional mechanical or spring-loaded buffer may be advantageous. In this case, the additional buffer can have a very short stroke, eg less than 1 or 2 cm. This allows the system to handle with small errors. Those errors may be due to, for example, mechanical speed and are not constant, the rapier takes in and out the weaving yarn with some length change from pick to pick, or the binding between the weft and warp is the pick. May change slightly from to picks etc.

FIG. 5 shows a flowchart illustrating some steps when controlling the weft supply device 12 that supplies the weaving yarn 40 to the rapier loom 10. First, in step 501, the controller is provided with information about the speed of the rapier at different times during the operation of the rapier loom. In step 501, a model of weft insertion speed in the loom during the machine cycle is formed. The operation in step 501 can be performed before the system is started and is not necessarily part of the control procedure. Typically, a reference table of relevant control data can be preloaded into the controller. Next, in step 503, the motor-driven bobbin is controlled to supply weft at an essentially constant speed, so that the amount of weft unwound corresponds to that amount of weft consumed by the rapier loom. do. Further, in step 505, the motor of the motor-driven loop buffer device is driven based on the difference between the output speed of the weaving yarn from the motor-driven bobbin and the model of the weft insertion speed in the loom. Finally, in step 507, the motor drive of the motor-driven loop buffer device is adjusted based on a signal representing the actual weft tension. Also, the speed of the motor of the motor-driven bobbin can be adjusted based on a signal representing the actual weft tension.

In FIG. 6, a controller 32 that controls the weft thread supply device 12 is drawn. As described above, the controller 32 can include an input / output 81 that accepts input signals for parameters used to control the weft feeder. For example, the input signal can be various sensor signals from a sensor in the weft feeder. For example, the sensor signal can be sourced from any type of sensor, such as an optical sensor, a mechanical sensor, a capacitance sensor. For example, the weaving thread tension sensor can be a piezo resistance type sensor, a strain gauge type sensor, or one by detecting the position of an elastic or spring-loaded weaving thread guide. Thereby, the weaving thread length can be determined. The length of the weaving yarn is a weaving yarn tension signal as a feedback signal for controlling the motor speed of the motor-driven loop buffer device, or as a feedback signal for controlling the motor speed of the motor-driven bobbin in some embodiments. It can be used as an alternative or as a combination. Other types of input signals can also be supplied, such as encoder signals and the like. Further, the signal from the rapier loom can be input to the controller 32 and can be used to control the weft supply device. In particular, loom angles can be provided. The input / output 81 outputs a motor control signal to the motor controlled by the weft supply device. The controller 32 further includes a microprocessor that can be called an arithmetic processing unit 82. The arithmetic processing unit 82 is connected to the memory 83 and can execute the computer program instructions stored in the memory 83. The memory 83 can also store data that can be accessed by the arithmetic processing unit 82. The data in the memory can include pre-stored data about the loom 10. In particular, a model of rapier motion can be stored to form a model of weft velocity to the rapier loom. Computer program instructions may be suitable for causing the controller to control the weft feeder according to the teachings of this document. The controller 32 can be placed at any suitable location. For example, the controller 32 can be integrated into the motor of the weft feeder. The controller 32 can also be distributed at different locations.

Lightweight moving arms or other weaving loop forming members can be used to limit the load on the buffer arm motor. It can be of several types, for example using lightweight and rigid materials such as carbon fiber, or lightweight designs on aluminum plates.

The above example is for illustration purposes only. Many changes can be considered and different embodiments can be combined to meet specific implementation needs.

The weft supply device as described here is a so-called positive supply system. That is, it measures and outputs a predetermined weaving yarn amount in synchronization with the loom angle. In other words, the loom controls the amount of weaving yarn available to the loom in that the loom cannot draw more weaving yarn than the weaving yarn feeder has supplied. This is in contrast to the so-called negative feeder, where the loom draws the amount of weaving yarn, without being limited by how much weaving yarn the weaving yarn feeder can supply. Therefore, in a negative supply system, the loom has more or less free access to the weaving yarn. On the other hand, in a positive feeding system, the weaving yarn feeder determines how much weaving yarn can be supplied to the loom. In a positive supply system, feedback that corrects the error between the predetermined amount of weaving yarn and the actual consumption is obtained by the sensor, especially the weaving yarn tension sensor. In one embodiment, the weaving tension sensor is combined with a small mechanical or spring-loaded weaving buffer.

Claims (15)

A weaving yarn supply device (12) that supplies weft yarns (40) to a loom (10) having at least one rapier (11), wherein the weft yarns supplied to the loom have a controlled weft yarn tension. The loom supply device comprises a motor-driven bobbin (13) and a motor-driven loop buffer device (16), and the loom supply device is a controller that further controls the motors of the motor-driven bobbin and the motor-driven loop buffer device. (32) is provided, and the controller constitutes the following items.
-Driving a motor-driven bobbin motor (14) at a speed to provide an essentially determined average weft amount consumed by the loom,
Here, the essentially determined average weft amount deviates from the actual average amount consumed by inserting the weft into the loom by less than a preset amount.
-Driving the motor of a motor-driven loop buffer device based on the difference between the output speed of the weaving yarn (40) from the motor-driven bobbin and the model of the weft insertion speed in the loom,
-Adjusting the drive of the motor of the motor-driven loop buffer device based on the signal representing the actual weft tension or the signal representing the length of the weft actually inserted into the weaving machine, where the controller (32) The difference between the amount of weaving yarn unwound from the bobbin and the amount of weaving yarn consumed by the weaving machine during insertion keeps the length of the buffered weaving yarn equal or within a predetermined range, thereby keeping the weaving yarn tension. Of the motor-driven loop buffer device (16), as well as to keep the controlled weaving tension constant or to make the controlled weaving tension follow a predetermined weaving tension curve over the weaving machine cycle. It is configured to control the motor (14),
Weaving thread supply device. The weaving yarn supply device according to claim 1, wherein the motor-driven loop buffer device is formed by arms (22, 24, 26) connected to a motor of the motor-driven loop buffer device. The motor-driven loop buffer device is an arm (22, 24, 26) directly attached to the output shaft of the motor of the motor-driven loop buffer device (16), or an arm connected to the output shaft via a gear arrangement. The weaving yarn supply device according to claim 2, which is formed by. The weaving yarn supply device according to claim 1, wherein the motor-driven loop buffer device is formed of a member that moves in one direction and the opposite direction. The weft yarn according to any one of claims 1 to 4, wherein the weft insertion speed model is based on parameters including information about the rapier position or speed with respect to the mechanical angle position of the loom and information about the length of the pick. Feeding device. The weaving thread supply device according to any one of claims 1 to 5, wherein the information about the mechanical angle position at the moment of the loom is transmitted from the loom to the weaving thread supply device. Information about the weft pattern that affects the velocity of the yarn fed to the loom, is transmitted to the yarn feeding device during and / or operation prior to the start of the loom, according to any one of claims 1 to 6 Weaving thread supply device. The weaving yarn supply device according to any one of claims 1 to 7 , wherein the motor (14) of the motor-driven bobbin is configured to unwind the weft from the bobbin using a center drive mechanism. The weaving yarn supply device according to any one of claims 1 to 8 , wherein the motor (14) of the motor-driven bobbin is configured to unwind the weft from the bobbin using a tangential drive mechanism (15). The weaving yarn feeder according to any one of claims 1 to 9 , wherein the speed of the motor (14) of the motor-driven bobbin is adjusted based on a signal representing the actual weft tension. The weaving yarn feeder according to any one of claims 1 to 10 , wherein the speed of the motor (14) of the motor-driven bobbin is adjusted based on a signal representing the position of the buffer of the motor-driven loop buffer device. When a difference is detected between the actual average amount of weaving yarn supplied from the bobbin and the actual average amount consumed by the loom, the controller controls the motor-driven bobbin to compensate for the difference. The weaving yarn supply device according to any one of claims 1 to 11 , which is configured to control the speed of the motor (14). The weaving yarn feeder according to any one of claims 1 to 12 , wherein the actual diameter of the bobbin is available by a controller. A method of controlling a weaving yarn supply device (12) for supplying a weft yarn (40) to a loom (10) having at least one rapier (11), wherein the weft yarn supplied to the loom is a controlled weft yarn. Having tension, the loom feeder comprises a motor driven bobbin (13) and a motor driven loop buffer device (16), and the loom feeder further comprises a motor driven bobbin motor and a motor driven loop buffer device. A controller (32) for controlling the control method is provided.
-Driving a motor-driven bobbin motor (14) at a speed to provide an essentially determined average weft amount consumed by the loom (503),
Here, the essentially determined average weft amount deviates from the actual average amount consumed by inserting the weft into the loom by less than a preset amount.
-Driving the motor of a motor-driven loop buffer device based on the difference between the output speed of the weaving yarn (40) from the motor-driven bobbin and the model of the weft insertion speed in the loom (505).
-Adjusting the motor drive of a motor-driven loop buffer device based on a signal representing the actual weft tension or the length of the weft actually inserted into the loom (507).
Bei to give a,
Here, the controller (32) keeps the length of the buffered weaving yarn equal to or within a predetermined range by the difference between the amount of weaving yarn unwound from the bobbin and the amount of weaving yarn consumed by the loom during insertion. The motor drive, thereby controlling the weaving tension, as well as keeping the controlled weaving tension constant or causing the controlled weaving tension to follow a predetermined weaving tension curve over the loom cycle. Control the motor (14) of the loop buffer device (16),
Control method. A computer program product comprising computer program code configured to allow a computer to control a weaving yarn feeder (12) according to the method of claim 14 when executed in a computer.

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