Classifications

• • D—TEXTILES; PAPER
  • D03—WEAVING
  • D03D—WOVEN FABRICS; METHODS OF WEAVING; LOOMS
  • D03D51/00—Driving, starting, or stopping arrangements; Automatic stop motions
  • D03D51/007—Loom optimisation
• • D—TEXTILES; PAPER
  • D03—WEAVING
  • D03D—WOVEN FABRICS; METHODS OF WEAVING; LOOMS
  • D03D47/00—Looms in which bulk supply of weft does not pass through shed, e.g. shuttleless looms, gripper shuttle looms, dummy shuttle looms
  • D03D47/28—Looms in which bulk supply of weft does not pass through shed, e.g. shuttleless looms, gripper shuttle looms, dummy shuttle looms wherein the weft itself is projected into the shed
  • D03D47/30—Looms in which bulk supply of weft does not pass through shed, e.g. shuttleless looms, gripper shuttle looms, dummy shuttle looms wherein the weft itself is projected into the shed by gas jet
• • D—TEXTILES; PAPER
  • D03—WEAVING
  • D03D—WOVEN FABRICS; METHODS OF WEAVING; LOOMS
  • D03D51/00—Driving, starting, or stopping arrangements; Automatic stop motions
  • D03D51/005—Independent drive motors
• • D—TEXTILES; PAPER
  • D03—WEAVING
  • D03D—WOVEN FABRICS; METHODS OF WEAVING; LOOMS
  • D03D51/00—Driving, starting, or stopping arrangements; Automatic stop motions
  • D03D51/12—Driving, starting, or stopping arrangements; Automatic stop motions for adjusting speed

Definitions

• the invention relates to a method for setting weaving parameters for weaving machines and a control device.
• weaving machines it is known to weave parameters such as the pressure and / or amount of compressed air supplied to a nozzle, the start and / or duration of the supply of compressed air to the nozzle, the time at which a weft thread is cut, the time at which a weft thread is released on the prewinder, and other weaving parameters store in a control unit of the weaving machine.
• predetermined weaving speeds or speeds of the weaving machine for predetermined ones.
• processing yarns and / or predetermined weaving patterns to define standard values for the weaving parameters and to send them to the weaving machine by means of a chip card to be entered or by means of a network and / or to store them in the control unit of the respective weaving machine.
• the standard values of the weaving parameters result in a setting with which a weaving machine can process a given yarn with a given weaving pattern at a given weaving speed.
• Such standard values of the weaving parameters are determined experimentally by the manufacturer of the weaving machine, for example.
• a weaving machine If a weaving machine is to be used to produce a fabric, the operator determines the weaving speed. Depending on the yarn to be processed and / or weaving pattern, he selects a set of standard values for the weaving parameters. The operator then starts the weaving machine with the standard setting, i.e. the default values of the web parameters. The operator then optimizes the values of the weaving parameters until the loom is able to optimally manufacture a fabric, i.e. for example a fabric with an optically perfect appearance, which is woven with minimal air consumption and with a minimal number of weft and / or warp thread breaks.
• the standard setting i.e. the default values of the web parameters.
• the operator optimizes the values of the weaving parameters until the loom is able to optimally manufacture a fabric, i.e. for example a fabric with an optically perfect appearance, which is woven with minimal air consumption and with a minimal number of weft and / or warp thread breaks.
• a setting with standard values of the weaving parameters is selected in a corresponding manner, which are then optimized in the manner described by the operator.
• weave patterns according to which the warp threads bind the weft threads, warp tension patterns or combinations of the mentioned patterns can be taken into account in the optimization. Optimizing the values of the web parameters therefore takes a relatively long time, especially if different types of Weft threads with different weave patterns can be processed.
• the operator changes the weaving speed (speed of the weaving machine), for example in order to check whether he can weave a fabric of the same quality at a higher speed, he again selects a setting with a set of standard values for the weaving parameters that correspond to this weaving speed assigned.
• the operator must then optimize the values of the weaving parameters for each type of weft thread and / or each type of weave and / or different warp tension patterns and / or combinations thereof. This work to optimize the values of the weaving parameters takes a relatively long time, so that adjustments to the weaving speed are often dispensed with.
• the invention has for its object to simplify a method for setting weaving parameters and in particular to carry out the weaving and / or checking the weaving possibilities at different weaving speeds.
• This task is solved by determining and setting values for the weaving parameters that are adapted to the changed weaving speed by means of current values of the weaving parameters for one weaving speed and one or more change functions.
• the invention is based on the fact that the values for the weaving parameters adapted in this way to the changed weaving speed largely agree with the values of the weaving parameters that are optimal for this weaving speed.
• This offers the advantage that the operator only has to make minor corrections and / or adjustments in order to achieve the optimal values of the weaving parameters for the changed weaving speed, so that optimal weaving parameters for the changed weaving speed are obtained relatively quickly. Since the values of the weaving parameters adapted to the changed weaving speed are determined and set automatically, the invention also offers the advantage, in particular if a drive according to the applicant's WO 99/27426 is present, that the weaving machine is used during the transition from one weaving speed to another continue weaving.
• a subsequent weft thread entry arrives at a thread monitor within the specified tolerance after changing the weaving speed, so that no weaving machine stop is caused.
• the values of the weaving parameters can be adjusted automatically, for example depending on the time of arrival of the weft thread at a thread monitor, then based on the set of weaving parameters calculated using the change function, small adjustments can be made automatically, based on measurement data or measurement results, without intervention by the Operator a set of optimal values of the weaving parameters for the changed speed can be obtained.
• the invention is particularly advantageous also in looms that weave according to a speed pattern, ie with different weaving speeds for different weft entries.
• each weft thread entry is made at its own, suitable weaving speed carried out.
• the weaving machine then sets a suitable set of values of weaving parameters for each weft thread to be entered at its suitable weaving speed, which is almost optimal.
• the method according to the invention contains the determination of the current, optimized set of weaving parameters for each weft thread entry of a weaving pattern and the determination of a new set of weaving parameters for the weft insertion of the weaving pattern at a changed weaving speed by adapting the current, optimized set of weaving parameters by means of a change function.
• the change function is determined as a function of weaving parameters of a standard setting for a first weaving speed and weaving parameters of a standard setting for a second weaving speed.
• the first weaving speed is preferably substantially the same as the current weaving speed and / or the second weaving speed is substantially the same as the changed weaving speed.
• the change function is determined as a function of at least one optimally set set of values of the weaving parameters at a given weaving speed.
• the change function for the transition to weaving with a third weaving speed is relatively accurate depending on the two optimally set values of the weaving parameters to determine and so to get a practically optimal set of values for weaving parameters for the third weaving speed.
• Such a change function can also be determined as a function of two optimally set sets of values of the weaving parameters for weaving another fabric with two different weaving speeds.
• the change function is continuously adapted as a function of at least one set of optimized values of the weaving parameters.
• the change function is preferably adapted to each automatically set set of weaving parameter values. This makes it possible to determine the change function as precisely as possible, whereby the automatic adaptation of the new set of values of the weaving parameters is restricted when the weaving speed changes. This is particularly advantageous if a weft thread is processed on a weaving machine at different weaving speeds.
• the change function is determined as a function of at least one known change function and the changed weaving speed. This means, for example, that if at least two change functions for switching between different NEN weaving speed are known, a new change function depending on the already determined change functions of the next weaving speed can be determined for the change to a subsequent weaving speed.
• the change from a first weaving speed to a second weaving speed is accompanied by a gradual change in the first weaving speed via an intermediate speed lying between the first and the second weaving speed, with a weaving parameter set for a subsequent weaving speed depending on the previous weaving parameter set an associated change function is determined.
• the set of weaving parameters is preferably automatically adapted for each intermediate speed.
• a web parameter set for a subsequent weaving speed is then determined as a function of the automatically adjusted web parameter set. This is particularly advantageous when the first and second weaving speeds differ significantly.
• One of the change functions mentioned above is preferably determined for each type of weft thread to be processed. This has the advantage that the change function can be optimally selected for each type of weft thread.
• control device for carrying out the method, which contains means for adjusting values for the weaving parameters by means of values of weaving parameters that are current for a weaving speed and one or more change functions during the transition to another weaving speed determine and adjust.
• the drawing shows a schematic representation of an air jet weaving machine with a control device according to the invention.
• the air nozzle weaving machine has a control unit 1.
• a weft thread as described in US Pat. No. 4,673,004, is emitted by a pre-spooling device 2, which has a controlled magnetic clamp 3, and blown into a shed by a main nozzle 4.
• Each main nozzle 4 is supplied with compressed air via a controlled venting device 5.
• the weft thread is guided in the shed by relay nozzles 6, each of which is fed with compressed air via a valve device 7.
• the valve devices 5 and 7 are designed, for example, as is known from US Pat. No. 5,086,812, WO 97/29231 or WO 99/64651.
• a thread monitor 8 The arrival of the weft thread on the other side of the shed is monitored with the aid of a thread monitor 8.
• An inserted weft thread is cut with a controlled weft scissors 9, for example with a weft scissors known from US 4,834,145.
• a stretching nozzle 10 as is known from US Pat. No. 5,226,458, is also provided, which is supplied with compressed air via a valve device 11.
• a controlled thread brake 12 as is known, for example, from US Pat. No. 5,226,459.
• the air jet loom contains further controlled shed forming means 13, for example an electrically controlled selection device 14, which is driven by a controlled drive motor 15 and which in turn drives the shaft frame 16.
• the shaft frame or even every warp thread is operated by its own, controlled drive motor.
• the air jet weaving machine also contains a controlled edge device 17 which has a controlled drive motor 18, as is known, for example, from US Pat. No. 5,803,133 or WO 98/14651.
• the air jet weaving machine shown in the exemplary embodiment further has a warp let-off device 20 with a controlled drive motor 19, a fabric take-off device 22 with a controlled drive motor 21, a waste take-off device 24 with a controlled drive motor 23, a warp thread monitor 25 and a warp thread tension sensor 26.
• the air jet loom has a controlled main drive motor 27, which is primarily intended for driving a sley 28 on which the relay nozzles 6, the thread monitor 8, the stretching nozzle 10 and a reed 34 are mounted. Furthermore, edge layers 32 are provided for inserting the cut thread ends into the fabric, which are known for example from WO 98/28474.
• the valve devices 5, 7 and 11 are connected to a compressed air tank 33.
• the sley 28 is driven by the main drive motor 27 via a gear 35. The position of the sley 28 is detected by means of an encoder 36.
• the main drive motor 27 drives the sley 28 directly, as is known from WO 98/31856.
• the encoder 36 determines both the position of the sley 28 and the position of the main drive motor 27.
• An air jet loom can also contain other parts, each of which is controlled by a drive motor.
• the above list of possible controllable elements is not exhaustive.
• the weaving speed is determined by the speed of the main drive motor 27, which corresponds, for example, to US Pat. No. 5,617,901 or WO 98/31856 and can be controlled at a defined speed.
• the components of the air jet weaving machine listed above are controlled according to a set of values of weaving parameters by means of the control unit 1 of the air jet weaving machine.
• the control unit 1 is connected to a memory 29 for storing at least one set of values of the weaving parameters.
• a set of weaving parameters includes time, pressure, air volume, position, speed, force and other weaving parameters.
• the values of the weaving parameters are preferably stored in the memory 29, for example, for each weft thread entry of a weaving pattern in association with the weaving speed of the air jet weaving machine.
• the memory 29 can be accommodated in the control unit 1. However, it can also be connected to the control unit 1 via a network.
• the weaving parameters are pressure and / or air quantity of the compressed air supplied to a nozzle and the start and / or duration of the compressed air supply to the associated nozzle.
• the weaving parameter represents the cutting time.
• the weaving parameters are the time at which the magnetic clamp 3 releases a weft thread and the time at which the magnetic clamp 3 closes again.
• the edge device 17 the position and the speed of the drive motor 18 of the edge device and the respective position and / or speed of the sley relative to the edge device 17 and in particular the crossing moment of the edge thread depending on the position of the sley 28 form the weaving parameters.
• the weaving parameter is the speed.
• the drive motor 23 of the waste rewinder 24 is weaving parameters the speed.
• weaving parameters are the warp thread tension or the force exerted by the warp thread.
• the weaving parameters are the time, the duration and the braking force.
• the input unit 30 is, for example, a keyboard of the air jet loom. However, the input unit can also be a reading unit of the air jet weaving machine for a memory card or a module of the control unit 1 coupled to a network.
• the current values of the weaving parameters to be adapted to the changed weaving speed are determined and stored by means of a processing unit 31.
• the processing unit 31 can be part of the control unit 1 itself. However, it can also be connected to the control unit 1 of the air jet weaving machine via a network. In this processing unit 31, for example, at least one change function, which will be described in more detail below, is also input and stored via the input unit 30.
• Each weaving parameter of the optimized values of the set of weaving parameters is then adapted by the processing unit 31 to the changed weaving speed according to a predetermined change function, as a result of which a new set of values of the weaving parameters is formed.
• the new set of values the weaving parameter is then set by means of the control unit 1 for weaving with the changed weaving speed.
• the control unit 1 will control the components of the weaving machine to carry out at least one weft insertion of a weaving pattern with the changed weaving speed in accordance with the new set of values of the weaving parameters. This procedure can be repeated for each individual weft entry of a weaving pattern.
• the change function can be entered, for example, via the input unit 30.
• the processing unit 31 can also calculate the change function itself, in particular with a set of values of the weaving parameters of a standard setting for a weaving speed, which is essentially equal to the weaving speed with the optimized values of the weaving parameters, and depending on a set of values of the weaving parameters Standard setting for a second weaving speed that is at least approximately equal to the weaving speed to which the weaving speed is to be changed.
• the change function is calculated in the processing unit 31 on the basis of optimally set values of the weaving parameters and as a function of measurement data.
• a possible change function for the adjustment of the pressure at the main nozzle 4 can be formed as follows. If the pressure for a weaving speed of 600 entries / minute is 5 bar with a standard setting and 6 bar with a standard setting for a weaving speed of 700 entries / minute, the change function for a transition from 600 to 700 entries / minute is given as Coefficient can be formed from 6/5 equal to 1.2. The pressure can then be multiplied by this coefficient. If the optimized value of the pressure during weaving at a weaving speed of 600 entries / minute is 4 bar and if a transition from 600 to 700 entries / minute is desired, the change function mentioned above results in a pressure of 4.8 bar, ie 4 bar times 1.2 for a weaving speed of 200 entries / minute.
• the processing device 31 can calculate the change function, for example, using a three-sentence calculation. Based on the example given above with the coefficient of 1.2 for a change function for the transition from 600 to 700 entries / minute, a coefficient of 1.1 results for a transition from 600 to 650 entries / minute according to a three-rate calculation. The value to be set for the pressure web parameter at 650 entries / minute is then 4.4 bar, i.e. 1.1 by 4 bar.
• the change function can be the addition of a constant, as is explained, for example, for the point in time at which the weft thread scissors 9 cut. If a standard setting specifies the value for cutting the weft scissors 9 at 600 entries / minute at 120 ° crank angle and a standard setting for 700 entries / minute specifies the cutting at 125 °, the change function consists, for example, of adding 5 degrees of angle. If, with an optimized setting, a weaving speed of 600 entries / minute is cut at 116 ° crank angle, the change function (+ 5 °) is used to set this parameter at 700 entries / minute to 121 ° crank angle.
• a value adapted to the changed speed is determined and set for each weaving parameter.
• the change functions are not limited to addition or multiplication. Other mathematical and / or statistical calculation types are suitable, such as for example mean value, squares of errors and other functions.
• a change function can be determined more precisely the more standard settings of values of the weaving parameters are known for given weaving speeds.
• a change function does not have to be entered into the processing unit 31 via the input unit 30.
• the processing unit 31 also does not have to determine the change function on the basis of the standard setting for values of web parameters entered by means of the input unit.
• a more accurate change function will usually result if the change function is determined on the basis of optimally set sets of values of the weaving parameters at two or more different weaving speeds.
• the change function can be determined by comparing the two sets of values of the weaving parameters and determining the associated coefficients, factors and / or constants. If sets of optimized weaving parameters for several weaving speeds are known, then statistical methods can be used to determine the change function.
• the associated change function can also be adapted in a corresponding manner when adapting the weaving parameters.
• the change function was a coefficient of 1.2 based on the values of standard settings of the weaving parameters. If the weaving parameters had been calculated based on the setting of optimized values, the result would have been, for example, a coefficient of 1.18. Or in the case of an automatic adjustment of the weaving parameters based on web data, the coefficient had been 1.17, for example.
• the change function can also be determined on the basis of values of the weaving parameters for a fabric that differs from the fabric for which the change function should be.
• the standard setting, on the basis of which the change function is determined can be determined by means of standard settings of another tissue - but preferably of a similar tissue.
• a new change function for a transition to other weaving speeds can be determined on the basis of these two changing functions. For example, if a change function, e.g. a coefficient of 1.2 for a transition from 600 to 700 entries / minute and a change function, for example a coefficient of 1.4 (or 1.2 + 0.2) for a transition from 700 to 800 entries / minute are known , a change can easily be determined for a transition from 800 to 900 entries / minute, for example a coefficient of 1.6, ie 1.4 + 0.2.
• the invention is particularly suitable for weaving according to a speed pattern, in which the weft entries are interwoven with different weaving speeds.
• two weft threads are woven according to a weft pattern and a speed pattern.
• a first weft A can be processed, for example, up to 800 entries / minute, whereas a second weft B can only be woven up to 600 entries / minute.
• the weft pattern comprises, for example, the successive weaving of a weft thread A, A, A, A, A, B, B, A, B and B.
• the speed pattern was then selected as follows: 700, 800, 800, 800, 700, 600, 600, 700, 600 and 600 entries / minute.
• weft B is always processed at maximum speed, while the weft A is processed before or after a transition to the weft B at a lower speed and for other weft entries at maximum speed.
• the operator optimizes the weaving parameters for weft A at a weaving speed of 800 entries / minute. For the insertion of weft B, he optimizes the weaving parameters for 600 entries / minute. The operator then adjusts the weaving parameters for weft A in accordance with the method according to the invention in order to obtain suitable weaving parameters for weaving weft A at 700 entries / minute, which he can then easily optimize again. This makes it possible to quickly optimize the weaving parameters for 700 entries / minute.
• the processing unit 31 can determine a new, more precise change function. If the weaving parameters for weaving at 800 entries / minute are then changed automatically depending on, for example, the arrival time of the weft thread, the weaving parameters for 700 entries / minute can also be adjusted according to the change function. This is advantageous, for example, when the properties of the weft thread A change depending on its position in a supply spool, as is the case, for example, with filament yarns.
• the weaving parameters can then be changed by the described method for inserting a weft thread at 700 entries / minute, so that incorrect weft entries can be prevented.
• the weaving parameters at 700 entries / minute of the weft thread A can be adjusted further on the basis of measurement data and the change function can be optimally set on the basis of several sets of weaving parameters.
• the invention is less advantageous when changing a weaving speed from, for example, 700 entries / minute to 702 entries / minute.
• the weaving parameters can be automatically adjusted in a known manner depending on measurement data.
• the primary aim of the invention is to take relatively large changes in weaving speed into account, for example changes from 700 entries / minute to at least 720 entries / minute.
• the automatic adjustments are usually not sufficient, so it is necessary to deviate from a standard setting again.
• the change can be carried out step by step. If, for example, a transition is made from 700 to 1000 entries / minute, the first step can be to 800 entries / minute, the set of new values of the weaving parameters being determined according to the invention and then optimized. Based on the optimized set of values for the weaving parameters, the next step is to go to 900 entries / minute. According to the invention, a change function can then be used to determine a new set of values of the weaving parameters, which are then optimized again. After that, the entry is changed to 1000 entries / minute.
• the weaving parameters at 800 or 900 entries / minute do not necessarily have to be set optimally. The optimization can rely on it to change the weaving parameters somewhat in the right direction.
• the weaving parameters at 800 and 900 entries / minute are preferably adjusted as a function of measurement data.
• an approximately optimal setting can be achieved at these 800 or 900 entries / minute, on the basis of which an optimization of the setting at 1000 entries / minute can be achieved with the aid of the method according to the invention, which the operator does not have to improve or only slightly.
• an associated change function can be determined, which can differ from a change function between different weaving speeds for another weft thread.
• a certain type of weft thread for example a fibrous weft thread, will require less adjustment of the pressure of the main nozzle 4 when the weaving speed changes than a smooth weft thread on which the air flowing out of the main nozzle 4 can exert less force.
• the measurement data is not limited to measuring the time of arrival of a weft thread at a thread monitor.
• These measurement data can also consist of the image of the fabric produced, which is acquired with the aid of a goods inspection system, or the image of the bar produced, which is acquired with the aid of a goods inspection system.
• the weaving parameters for the shedding means 13 or for the edge device 17 can be automatically adjusted. It is clear that a loom optimally set at a certain weaving speed can weave almost optimally at almost any other weaving speed without operator intervention, depending more weaving parameters can be automatically adjusted and the more precisely the change function can be determined.
• a change function is determined on the basis of the optimized values of the weaving parameters and another set of the values of the weaving parameters - for example a set of the values of the weaving parameters of a standard setting with the existing weaving speed.
• a new set of values of the weaving parameters is determined in accordance with this variant, for example by adapting another set of the values of the weaving parameters to a standard setting for the changed weaving speed in accordance with the change function mentioned above, which determines on the basis of the optimized values of the weaving parameters becomes.
• the method according to the invention is particularly advantageous when weaving is carried out according to a speed profile, this speed profile being changed, for example, during weaving as a function of the energy supply to the weaving machine.
• this may mean that the transition from 600 to 700 to 800 entries / minute will change during weaving to a transition from 600 to 680 to 800 entries / minute if it is found that this change in power to the main drive motor 27 or to several other drive motors of the loom is advantageous.
• the change from 700 to 680 entries / minute with respect to a weft thread insertion can take place according to the method according to the invention without the operator having to optimize the associated set of values of the weaving parameters.
• the weaving parameters are, for example, the control times for opening the gripper clamps, as is known from WO 97/40218, the speed curve of the rapier belts with which the rapiers are brought into the shed via a controlled drive motor, the point in time which the weft thread holder is moved upwards after inserting a weft thread, as is known from US Pat. No. 5,400,834, and other weaving parameters.
• the invention is not limited to air jet weaving machines or rapier weaving machines. It can also be used to set the weaving parameters of other weaving machines.
• Such weaving machines include multi-phase weaving machines such as weaving rotors or the like, rapier weft weaving machines, water jet weaving machines, pro ectile weaving machines or other weaving machines.
• the invention is particularly suitable for weaving fabrics in which different weft threads with correspondingly different weaves are interwoven with warp threads, and very particularly if this weaving takes place at different machine speeds.
• the invention is of course of the greatest advantage when many weaving parameters have to be set. This applies especially to weaving machines in which several parts are driven by their own drive motors, which are controlled by a control unit of the weaving machine.
• the method according to the invention also offers the advantage that it can be easily applied to an existing weaving machine, assuming some adjustments to an existing weaving machine.
• the invention is most advantageous in the case of a weaving machine which is equipped with a main drive motor 27 which can be controlled in terms of speed, since in this case the adaptations are restricted to the attachment of a device according to the invention.
• the invention is not limited to the embodiments described by way of example and shown in the drawing. Other variants can be implemented within the scope of the invention.

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• 2000
  • 2000-04-14 BE BE2000/0273A patent/BE1013392A3/nl not_active IP Right Cessation
• 2001
  • 2001-04-14 CN CNB018080367A patent/CN1262701C/zh not_active Expired - Lifetime
  • 2001-04-14 EP EP01938117A patent/EP1272699B1/fr not_active Expired - Lifetime
  • 2001-04-14 AT AT01938117T patent/ATE306578T1/de not_active IP Right Cessation
  • 2001-04-14 DE DE50107688T patent/DE50107688D1/de not_active Expired - Lifetime
  • 2001-04-14 AU AU2001263860A patent/AU2001263860A1/en not_active Abandoned
  • 2001-04-14 US US10/240,752 patent/US7110847B2/en not_active Expired - Fee Related
  • 2001-04-14 WO PCT/EP2001/004286 patent/WO2001079597A1/fr active IP Right Grant

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