EP2050847B1 - Verfahren zum Transport eines Schussfadens durch das Webfach einer Webmaschine - Google Patents

Verfahren zum Transport eines Schussfadens durch das Webfach einer Webmaschine Download PDF

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Publication number
EP2050847B1
EP2050847B1 EP07020515A EP07020515A EP2050847B1 EP 2050847 B1 EP2050847 B1 EP 2050847B1 EP 07020515 A EP07020515 A EP 07020515A EP 07020515 A EP07020515 A EP 07020515A EP 2050847 B1 EP2050847 B1 EP 2050847B1
Authority
EP
European Patent Office
Prior art keywords
weft thread
nozzle
thread
total charge
main component
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
EP07020515A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP2050847A1 (de
Inventor
Jan Colditz
Matthias Sachse
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Siemens AG
Original Assignee
Siemens AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Siemens AG filed Critical Siemens AG
Priority to EP07020515A priority Critical patent/EP2050847B1/de
Priority to JP2008266540A priority patent/JP2009102792A/ja
Priority to US12/288,043 priority patent/US7654290B2/en
Priority to CN200810170278.8A priority patent/CN101413177B/zh
Publication of EP2050847A1 publication Critical patent/EP2050847A1/de
Application granted granted Critical
Publication of EP2050847B1 publication Critical patent/EP2050847B1/de
Ceased legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • 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
    • D03D47/3026—Air supply systems
    • D03D47/3033—Controlling the air supply

Definitions

  • the invention relates to a method for transporting a weft thread through the shed of a weaving machine with the aid of at least one nozzle fed with a flowing transport medium. Moreover, the invention relates to a loom with at least one fed with a flowing transport medium nozzle for transporting a weft thread through the shed of the loom.
  • a directed air jet is generated by means of air nozzles, which conveys the weft thread in free flight through the shed.
  • air nozzles which conveys the weft thread in free flight through the shed.
  • several air nozzle groups (main nozzles, relay nozzles) are controlled in a time-staggered manner by pneumatic valves.
  • the main nozzles ensure the acceleration of the weft thread.
  • the relay nozzles guide the thread tip through the shed.
  • the air nozzles are controlled according to a predefined time regime.
  • the correct setting of the switching times is u. a.
  • the air pressure and the climatic conditions are often based on experience from weaving tests.
  • the start of the weft thread is defined by the time at which the yarn brake of the loom is released and the main nozzles are pressurized with compressed air.
  • the thread arrival is measured by two optical sensors.
  • US 2005/0203659 A1 is a method for controlling the transport of a weft thread in a loom with air nozzles known according to the preamble of claim 1 or claim 6.
  • the speed of the thread is measured and from there with the aid of a complicated mathematical model, the force acting on the thread tensile force calculated. On the basis of the determined tensile force, the transport of the thread is then controlled.
  • An object of the present invention is to optimize the transport of the weft thread in a weaving machine in which a weft thread is transported through the shed with the aid of at least one nozzle fed with a flowing transport medium.
  • the axial speed of the weft thread is understood to mean the speed of the weft thread in the direction of its longitudinal extent (thread axis).
  • a core idea of the invention is the preferably automatic control of the nozzles (main and / or relay nozzles) as a function of the axial speed of the weft thread.
  • the invention is concerned with the control of the relay nozzles.
  • the axial velocity of the weft thread is determined by a contactless measuring method.
  • the measuring device required for this purpose works on the basis of the German patent DE 199 00 581 B4 described physical principle of a non-optical spatial filter method, ie a spatial filter method with a non-optical transducer.
  • the measurement method is based on detecting the variable length of the weft yarn portion of the natural, randomly arranged on the weft yarn filament by means of the influent therefrom influential effect, wherein the weft on a single pickup, containing an electrode assembly with in the axial direction of thread locally dependent periodically changing sensitivity to the Influenz Sweet , passing and generating a varying total charge in at least a portion of the electrode assembly, detecting a time-related approximately periodically changing its overall charge, and detecting the varying total charge on the electrode assembly as a narrow band frequency mixture concentrated around a main component this main component the axial velocity of the passing weft thread is proportional.
  • the invention is based on the recognition that the use of a filter is required to filter out (in particular low-frequency) disturbances in the signal which would otherwise preclude useful signal utilization.
  • a non-variable, fixed filter element can for this purpose because of the high dynamics of the weft thread (accelerations up to 20000 m / s 2 ) and the resulting different signals at the beginning of the shot, on the one hand, and in the continuous course of the shot, on the other hand, are not used, since the useful frequencies present at the beginning of the thread acceleration become interference frequencies in the later course of the shot.
  • a fixed filter element is not able to remove the error-causing frequencies from the useful signal.
  • an adjustable filter element the required filtering can be performed easily. In this case, an automatic setting of the center frequency of the bandpass filter used takes place in accordance with the currently measured frequency f H of the main component of the frequency mixture.
  • the flight of the weft thread can be modeled extremely accurately.
  • the axial velocity of the weft thread can be detected at one or more points of the trajectory.
  • the air jets of the weaving machine can be adjusted automatically or even regulated.
  • the movement of the shafts is coupled to the angle of rotation of the main shaft of the weaving machine. From a fixed angle of rotation moves one shaft upwards, another shaft down. This will open the shed.
  • the shed should be open as long as possible as this will increase the available weft insertion time.
  • a pre-nozzle (not shown) and a main nozzle 5 tighten and accelerate the weft thread 4 at the weft speed as soon as the weft thread 4 from the feeder 2 is released.
  • the relay nozzle groups 6 are sequentially activated based on the predetermined engine rotation angle or the shot duration.
  • An arrival sensor 7 registers when the weft thread 4 reaches the weaving width.
  • the weft thread 4 is caught by a suction nozzle (not shown) or stretched by a stretching nozzle (not shown). The function of the stretching nozzle can take over the last relay nozzle group.
  • the reed (batten, reed) strikes the weft thread 4 to the finished fabric and the Rieder located on the reed scissors 8 cuts the weft 4 from.
  • the switching time of the machine control is an important criterion for air consumption.
  • changes in nozzle opening times can have a significant impact on energy consumption.
  • a weaving machine is equipped with a measuring device, which is referred to below as the sensor 11, cf. FIG. 4 .
  • the axial velocity of the weft thread 4 is determined in an evaluation unit 12 with the aid of the signals detected by the sensor 11.
  • a control unit 13 automatically controls the relay nozzles 6 as a function of the axial speed of the weft thread 4. It has proved to be particularly advantageous for the present application when the sensor 11 is arranged after the main nozzle 5. Because then only a single sensor 11 for all colors (weft rolls) is required. In principle, however, the sensor 11 can be arranged at any point of the yarn path.
  • the sensor 11 is designed to detect the variable length of the weft thread 4 proportion of natural, randomly arranged on the weft yarn filament by means of the emanating from these influential effect.
  • the sensor 11 comprises a pickup 14, which is arranged such that the weft thread 4 passes it.
  • the transducer 14 comprises an electrode assembly 15 with in the axial direction of thread 16 location-related periodically changing sensitivity to the influenza effect.
  • the weft thread 4 passing by the receiver 14 generates an alternating total charge At least in one part of the electrode assembly 15, a time-related approximately periodic change of the total charge is detected at the pickup 14, wherein the changing total charge is detected at the electrode assembly 15 as a focused around a main component narrow-band frequency mixture.
  • the frequency f H of this main component is proportional to the axial velocity of the passing weft thread 4, cf. DE 199 00 581 B4 ,
  • an electrostatic spatial filter method in which the weft thread is passed between two webs which form the electrode assembly 15, cf. FIG. 5 , Screen and measuring electrodes 17, 18 alternately sit on each web.
  • the shielding electrodes 17 separate the measuring electrodes 18 from each other.
  • the result is a frequency proportional to the speed in the voltage signal.
  • the second bridge has the same structure as the first, except that all electrodes are shifted by one electrode distance. As a result, the first bridge provides a signal, the second bridge is not and vice versa. As a result, the signals of both lands can be compared in a differential amplifier and noise effects can be reduced.
  • the spatial filter principle of the sensor 11 and the operation are in FIG. 5 shown.
  • the evaluation unit 12 is designed to evaluate the periodic change of the total charge for determining the axial velocity of the weft thread 4. For this purpose, the periodic changing total charge converted into periodic voltage fluctuations as a useful signal.
  • the evaluation unit 12 is furthermore designed to suppress part of the frequency mixture outside the main component.
  • the evaluation unit 12 has an adjustable, in particular an automatically nachregelbares filter element. This is preferably a bandpass filter 19 (in short: band filter).
  • a control component 21 is provided which is adapted to automatically adjust the center frequency of the bandpass filter 19 according to the currently measured frequency f H of the main component.
  • the evaluation unit 12 comprises a preamplifier 22, the bandpass filter 19, a post-amplifier 23, and a signal processing unit 24, cf.
  • FIG. 6 After the signal has been generated from the stochastically distributed charge of the weft thread 4 in the sensor 11, it is amplified in the preamplifier 22. Subsequently, filtering is carried out with the aid of the bandpass filter 19, which will be described in more detail below. Subsequently, an amplification of the signal with the post-amplifier 23 takes place. In the subsequent signal processing unit 24 with the differential amplifier, the signal is digitized or converted into a frequency-modulated square-wave signal, cf. FIG. 5 , right side.
  • the signal processing unit 24 also serves as a control component 21 for the band filter 19.
  • it comprises a PLL (Phase Lock Loop, not shown), which is preferably embodied as part of a VCO (Voltage Controlled Oscillator).
  • PLL Phase Lock Loop
  • VCO Voltage Controlled Oscillator
  • the signal processing unit 24 also includes a differential amplifier (not shown).
  • the signal processing unit 24 is an electronic data processing unit and includes, among other things, an analog-to-digital converter and a digital signal processor (DSP). Instead of the DSP, another digital microcontroller, an application-specific integrated circuit (Application Specific Integrated Circuit, ASIC), a Programmable Field Programmable Gate Array (FPGA), or a Programmable Logic Device (CPLD).
  • the signal processing unit 24 further includes a conventional data processing processor that interacts with data input and data output units.
  • the data processing unit comprises a computer program which is designed for execution in the processor.
  • the computer program comprises computer program instructions for executing the described method steps assigned to the signal processing unit 24 and for implementing the described functionalities (differential amplifiers, etc.) when the computer program is executed in the data processing unit.
  • a special digital circuit structure (FPGA, ASIC, CPLD,%) May also be provided, by the operation of which the method steps described for implementing the described signal processing unit 24 and for implementing the described Functionalities are executed or provided.
  • the bandpass filter 19 is adapted to the current measured frequency. In other words, an automatic tracking of the filter properties takes place in accordance with the measured signals.
  • the center frequency of the bandpass filter 19 is adjusted according to the current axial speed of the weft thread 4 when using a suitably trained and controllable via the control component bandpass filter 19, see.
  • FIG. 7
  • the bandwidth of the bandpass filter 19 is preferably set such that the useful signal does not leave the bandwidth within the time until the center frequency is updated.
  • the required bandwidth of the acceleration of the weft thread 4 and the cycle time of the realized by the signal processing unit 24 filter control depends.
  • the sensor signal passes through a frequency band of, for example, 5 kHz per millisecond (with a distance of the detection electrodes of, for example, 4 mm).
  • the bandwidth in the area of the start of acceleration is preferably limited to approximately 5 kHz, since otherwise the bandwidth at higher frequencies becomes too large for a meaningful signal conditioning.
  • the signal processing unit 24 must update the center frequency within 1.5 ms.
  • the clock signal of the PLL is used for determining the center frequency f M of the bandpass filter 19 used.
  • the signal conditioning has the following operating principle: At the beginning of the shot, the center frequency f M of a bandpass over a clock frequency, which is generated by the PLL, placed on the initial firing frequency + X.
  • the control components in the signal processing unit 24 supply a voltage signal to the PLL, which is a new clock signal generated, which sets the band filter 19 to the current payload signal frequency + X.
  • X is significantly dependent on the bandwidth of the bandpass filter 19 and the cycle time of the control component in the signal processing unit 24.
  • the filter element is preferably a digital filter which has a high degree of flexibility and whose parameterization can be carried out in a simple manner with the aid of a digital signal processor.
  • a digital filter but also an SC filter (switched-capacity filter) can be used, which can be parameterized for example using a PLC.
  • the axial velocity is linked to the frequency of the main component of the useful signal via a mathematical relationship and can therefore be calculated in the signal processing unit 24.
  • the position of the thread tip of the weft thread 4 at a defined, later point in time can be determined in the signal processing unit 24 from the axial speed of the weft thread 4 on the sensor 11.
  • the thread length can be determined, so that the sensor 11 can also serve as a thread length sensor.
  • a particularly comprehensive evaluation of information and, associated therewith, a particularly accurate and comprehensive control of the weaving machine 1 is possible if in the evaluation unit 12 not only the useful signals of the sensor 11 but also signals 25 of the other sensors (thread start, thread arrival, etc.) are brought together and used for evaluation.
  • the relevant for a control of the relay nozzles 6 information is transferred from the evaluation unit 12 to the control unit 13, which is designed for automatically controlling the relay nozzles 6 in dependence on the axial velocity of the weft thread 4.
  • a nozzle is understood to mean the switching on and possibly also switching off of the nozzle, here by actuating the magnetic switching valves 9.
  • the control unit 13 is designed in such a way that the relay nozzles 6 arranged in groups are then switched on one after the other when the thread tip of the weft thread 4 comes into its effective range.
  • control unit outputs a control signal 26, cf. FIG. 6 ,
  • the required measurement accuracy of the sensor 11 depends on two criteria. First, the cycle time (reaction time) of the controller used for the air nozzle section and the other part of the speed of the registered yarn. Basically, the control unit 13 will give the signal for the control of the relay nozzles 6 in advance. This lead time must be at least equal to the time to the nozzle drive signal applied (ie, the control-related delay) plus the nozzle orifice duration (including the delay of the magnetic switching valves). The measurement tolerance of the sensor 11 is added to this.
  • the control unit 13 can only output a signal at every cycle start, whereby "cycle” is understood to mean the time until the next reading of all input parameters and outputting of all output parameters. Therefore, the measurement error of the sensor 11 must be less than half the thread flight length within one cycle. In this specific case, tolerance ranges of a few centimeters result for the tested yarn material with a cycle time of 1.5 ms. An increase in the accuracy of the sensor 11 can be achieved by means of a more precise response of the control to the start of the shot and the end of the thread entry.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Looms (AREA)
EP07020515A 2007-10-19 2007-10-19 Verfahren zum Transport eines Schussfadens durch das Webfach einer Webmaschine Ceased EP2050847B1 (de)

Priority Applications (4)

Application Number Priority Date Filing Date Title
EP07020515A EP2050847B1 (de) 2007-10-19 2007-10-19 Verfahren zum Transport eines Schussfadens durch das Webfach einer Webmaschine
JP2008266540A JP2009102792A (ja) 2007-10-19 2008-10-15 織機の杼道を通して緯糸を搬送する方法および織機
US12/288,043 US7654290B2 (en) 2007-10-19 2008-10-16 Method for transporting a weft thread through the shed of a weaving machine
CN200810170278.8A CN101413177B (zh) 2007-10-19 2008-10-20 用于传送纬纱通过织机梭口的方法

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP07020515A EP2050847B1 (de) 2007-10-19 2007-10-19 Verfahren zum Transport eines Schussfadens durch das Webfach einer Webmaschine

Publications (2)

Publication Number Publication Date
EP2050847A1 EP2050847A1 (de) 2009-04-22
EP2050847B1 true EP2050847B1 (de) 2012-08-29

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EP07020515A Ceased EP2050847B1 (de) 2007-10-19 2007-10-19 Verfahren zum Transport eines Schussfadens durch das Webfach einer Webmaschine

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US (1) US7654290B2 (ja)
EP (1) EP2050847B1 (ja)
JP (1) JP2009102792A (ja)
CN (1) CN101413177B (ja)

Families Citing this family (8)

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US8960596B2 (en) 2007-08-20 2015-02-24 Kevin Kremeyer Energy-deposition systems, equipment and method for modifying and controlling shock waves and supersonic flow
WO2012068698A2 (en) * 2010-11-25 2012-05-31 Uster Technologies Ag A method and apparatus for controlling a jet loom
JP5901030B2 (ja) * 2010-11-25 2016-04-06 ウステル・テヒノロジーズ・アクチエンゲゼルシヤフト ジェットルームを制御する方法及び装置
BR112014000920A2 (pt) 2011-07-15 2017-02-14 Toyota Ind Corp tear com sensor de fios atribuído e método para operação do mesmo
CN103147212B (zh) * 2013-03-13 2014-06-04 浙江理工大学 一种喷气织机引纬速度自动控制系统及其调节方法
US10669653B2 (en) 2015-06-18 2020-06-02 Kevin Kremeyer Directed energy deposition to facilitate high speed applications
WO2016205750A1 (en) * 2015-06-18 2016-12-22 Kevin Kremeyer Directed energy deposition to facilitate high speed applications
CN118348274A (zh) * 2024-04-18 2024-07-16 杭州高腾机电科技有限公司 基于电荷的纱线智能检测系统及方法

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JPS5324458A (en) * 1976-08-10 1978-03-07 Nissan Motor Device for inserting weft in storage tube
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Also Published As

Publication number Publication date
US20090101226A1 (en) 2009-04-23
JP2009102792A (ja) 2009-05-14
US7654290B2 (en) 2010-02-02
CN101413177B (zh) 2013-02-20
EP2050847A1 (de) 2009-04-22
CN101413177A (zh) 2009-04-22

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