EP0000721B1 - Vorrichtung zum Aufwickeln von Garn - Google Patents

Vorrichtung zum Aufwickeln von Garn Download PDF

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Publication number
EP0000721B1
EP0000721B1 EP78100478A EP78100478A EP0000721B1 EP 0000721 B1 EP0000721 B1 EP 0000721B1 EP 78100478 A EP78100478 A EP 78100478A EP 78100478 A EP78100478 A EP 78100478A EP 0000721 B1 EP0000721 B1 EP 0000721B1
Authority
EP
European Patent Office
Prior art keywords
yarn
speed
sign
signals
multiplier
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.)
Expired
Application number
EP78100478A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0000721A1 (de
Inventor
Pieter Blok
Anthony Ewoud Jan Doyer
Cornelis Marinus Elenbaas
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.)
Oerlikon Barmag AG
Original Assignee
Barmag Barmer Maschinenfabrik AG
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Filing date
Publication date
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Publication of EP0000721A1 publication Critical patent/EP0000721A1/de
Application granted granted Critical
Publication of EP0000721B1 publication Critical patent/EP0000721B1/de
Expired legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H54/00—Winding, coiling, or depositing filamentary material
    • B65H54/02—Winding and traversing material on to reels, bobbins, tubes, or like package cores or formers
    • B65H54/28—Traversing devices; Package-shaping arrangements
    • B65H54/36—Yarn-guide advancing or raising mechanisms, e.g. cop-building arrangements
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H59/00—Adjusting or controlling tension in filamentary material, e.g. for preventing snarling; Applications of tension indicators
    • B65H59/38—Adjusting or controlling tension in filamentary material, e.g. for preventing snarling; Applications of tension indicators by regulating speed of driving mechanism of unwinding, paying-out, forwarding, winding, or depositing devices, e.g. automatically in response to variations in tension
    • B65H59/384—Adjusting or controlling tension in filamentary material, e.g. for preventing snarling; Applications of tension indicators by regulating speed of driving mechanism of unwinding, paying-out, forwarding, winding, or depositing devices, e.g. automatically in response to variations in tension using electronic means
    • B65H59/385—Regulating winding speed
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H61/00—Applications of devices for metering predetermined lengths of running material
    • B65H61/005—Applications of devices for metering predetermined lengths of running material for measuring speed of running yarns
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2511/00—Dimensions; Position; Numbers; Identification; Occurrences
    • B65H2511/20—Location in space
    • B65H2511/22—Distance
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2513/00—Dynamic entities; Timing aspects
    • B65H2513/10—Speed
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2513/00—Dynamic entities; Timing aspects
    • B65H2513/10—Speed
    • B65H2513/11—Speed angular
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2553/00—Sensing or detecting means
    • B65H2553/10—Sensing or detecting means using fluids, e.g. pneumatics
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2553/00—Sensing or detecting means
    • B65H2553/20—Sensing or detecting means using electric elements
    • B65H2553/23—Capacitive detectors, e.g. electrode arrangements
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2701/00—Handled material; Storage means
    • B65H2701/30—Handled filamentary material
    • B65H2701/31—Textiles threads or artificial strands of filaments

Definitions

  • the invention relates to a device for winding yarn on a sleeve to a yarn package, which device is provided with a drive having a drive motor with variable speed for winding the yarn at a constant speed, the drive being a speed control, which is based on a speed measurement of the Yarn based, includes.
  • the yarn is fed to the yarn roll via a suitable traversing device which is mounted on a bobbin spindle which is positively driven by a motor.
  • traversing devices and yarn packages can touch each other on their circumferences or form a narrow air gap with one another.
  • a contact roller can additionally be provided, which brings part of the necessary drive torque to the yarn package via the circumferential contact.
  • the speed control can be based on a yarn tension measurement.
  • the speed is controlled so that the yarn tension between the speed-giving godet and the yarn package remains constant.
  • the speed control can be used based on measuring the speed of the yarn instead of measuring the tension of the yarn.
  • this presents some problems when it is necessary for the yarn to be free-i.e. untouched by the speed measuring device. Such a situation arises in the rapid spinning of synthetic yarns. At speeds of a few thousand meters per minute, it is desirable that the yarn be spared as much as possible by contacting as few machine parts as possible before winding.
  • DE-A-1 535 086 describes a device for determining the speed and length of textile threads, which first applies electrostatic charges to the running thread in pulses and measures the speed between two defined points with the aid of these charges. However, before the electrostatic charges are applied, the thread slides over an earthed metal body, which is intended to remove any electrostatic charges present on the thread by then. Accordingly, this speed measuring device does not work completely without contact.
  • Cross-correlation is to be understood here in the general sense to mean any function which is suitable in the context of the invention and which relates to the relationship between the signals x (5) and y (t) or between the signals derived therefrom (depending on the delay time) ) reproduces.
  • detectors e.g. optoelectronic scanners are used, which convert the light reflected by the yarn back into an electrical signal.
  • detectors for measuring electrostatic charges are preferably used which emit electrical signals x (t) and y (t) which are caused by the electrical charge present on the yarn
  • charge-reacting detectors for the contactless measurement of the yarn speed V according to German patent application 1 912 510.
  • two measuring electrodes with a certain distance L from one another are arranged close to the yarn without touching it Charges induce electrical voltages in the electrodes, and the course of these voltages as a function of time takes into account a delay time broad agreement. This fact is used to determine the yarn speed from the relationship
  • an embodiment of the device is preferably used, which is characterized in that the means for determining whether the interrelation has reached its maximum comprise a differentiator for differentiating one of the two detector signals over time, so that a differentiated detector signal y '(5), and that the signals x (t) and y' (t) are fed to the correlator.
  • the correlation then takes the following form:
  • the value of ⁇ xt ( ⁇ ) is reduced to the easier determination of the zero crossing of the function ⁇ xy , ( ⁇ ).
  • a first embodiment of the latter device is characterized in that a controller is provided for regulating the speed of the drive motor, which controller has an input for the measured values of the yarn speed and an input for setting the desired value of the yarn speed and that the pushing pulse -Generator is formed by a pulse generator with a pulse repetition frequency dependent on a control voltage and that the integrator connected to the output of the multiplier is connected with its output to a control input of the pulse generator intended for supplying a control voltage, and that the output of said integrator continues with the Input for the measured values of the controller is connected.
  • Another embodiment according to the invention is characterized in that a controller is provided for regulating the speed of the drive motor, that the integrator connected to the output of the multiplier forms part of the automatic controller and that the shift pulse generator is formed by a pulse generator, the shift pulse to the shift register with a frequency feeds.
  • a comparator is preferably used as polarity detectors, which delivers output voltages at one of two logic levels "1” or "0", namely on one level if the input voltage of the comparator is above the comparison value and on the other level if the input voltage is below the comparison value.
  • a logic circuit can be used as a multiplier, which has the function X. Y + X. Y is satisfied, where X and Y are signals at the input of the multiplier.
  • the multiplier is a logic circuit with the function X. Y + X. Y formed, where X and Y are the signals at the input of the multiplier.
  • this speed control device is advantageously used on winding machines in which the traversing device forms an air gap together with the yarn package, i.e. in which the traversing device does not touch the yarn package.
  • Such a winding device is known from published Dutch patent application No. 7 305 826.
  • the yarn is changed by a thread guide which is driven by a traversing roller with a helical groove.
  • the traversing mechanism which comprises a thread guide and a traversing roller, can be moved radially to the yarn package by a displacement device controlled by a pneumatic sensor.
  • This sensor is attached to the traversing mechanism and has one or more openings located near the peripheral surface of the package, from which air flows from a compressed air source to which the sensor is connected. The air flowing out of the sensor hits the yarn package; part of this air bounces back into an air inlet opening of the sensor, which is connected to the displacement device.
  • the pressure of the air bouncing back into the sensor reaches a value at which the displacement device is operated in order to increase the distance between the yarn package and the traversing mechanism.
  • This known winding device has the disadvantage that only a part of the outflowing air bounces back into the sensor. Therefore, if the sensor is to work effectively, high air consumption is necessary.
  • the captured amount of the air flowing out of the nozzle and rebounding depends on the peripheral speed of the yarn package.
  • a winding device described below, to which the speed control device according to the invention is applied, is advantageously designed so that there is an organ extending there in the axial direction of the yarn package and forming a narrow air gap with the circumference of the yarn package, and that means are provided, which produce a tangential air flow through the air gap in relation to the yarn package, and that a pneumatic sensor is equipped with an air duct opening into the air gap or in the vicinity of the air gap, which conducts at least part of the tangential air flow, and that a jet nozzle and a trap nozzle are directed such that the tangential air flow captured in the air duct intersects the main air flow.
  • the tangential airflow can also be generated by a fan or by other airflow sources to create a forced airflow through the air gap.
  • the tantential air flow which is formed by the rotation of the yarn roll on its outer surface is used for this purpose.
  • the sensor now catches the air entrained by the yarn winder and thus controls the main air flow from the jet and catch nozzle.
  • the main air flow is more or less interrupted depending on the strength of the tangential air flow in the air gap.
  • This winding device has the advantage of lower air consumption compared to the known devices mentioned above; it can be used over a larger yarn speed range without the need to adjust the control settings of the shifting device and it reacts less violently to changes in the air gap, so that this results in a calmer positioning.
  • the organ which forms a narrow air gap together with the yarn package can e.g. be a flat or curved plate, which is held by the displacement device at a short distance from the circumferential jacket of the yarn package.
  • the organ which delimits the air gap together with the yarn package can be formed by this traversing roller.
  • a grooved roller can also be used as a traversing device and at the same time as an organ which forms the air gap together with the yarn package.
  • a preferred embodiment of the device according to the invention is characterized in that the air duct of the pneumatic sensor extends at least over a considerable part of the axial extension of the yarn package.
  • Another preferred embodiment of the device is designed in such a way that the air duct is formed by an elongated tube, one end of which is close to the air gap and is in open communication with the surroundings, and that the jet nozzle and the capture nozzle are located at a location remote from this end are attached, in such a way that the main stream is directed transversely to the longitudinal direction of the channel and the air channel between the said end and the jet and trap nozzles forms an air buffer.
  • the buffer effect of the air duct of the sensor means that pressure fluctuations occurring over time are averaged. This requires a damped control of the displacement device.
  • a particularly advantageous embodiment of the device consists in that the displacement device comprises a logic control unit which interacts with the pneumatic sensor and which, when the pressure in the collecting nozzle becomes greater than a first adjustable threshold pressure, causes the displacement device to remove the traversing device from the yarn package, and which, when the pressure in the trap nozzle becomes less than a second adjustable threshold pressure which is less than the first control value pressure, stops the removal movement of the traversing device from the yarn package.
  • This embodiment differs from the known device according to the Dutch patent application 7 305 826 advantageously in the following respects.
  • the known device there is a pneumatic amplifier between the sensor and the displacement device for the traversing device.
  • the amplifier responds at a certain first pressure of the rebounding air and then delivers compressed air to the displacement device in order to increase the distance between the traversing device and the yarn package. At a certain second pressure, which is lower than the first, the amplifier closes the supply for the compressed air to the displacement device, whereby the displacement of the traversing device is stopped.
  • the difference between the first and the second pressure, caused by the hysteresis of the pneumatic amplifier, is so great that the correction movement continues for too long, whereby the traversing device comes to a standstill further than necessary from the yarn package.
  • special precautions are taken, which consist of a relay valve located between the sensor and the amplifier and an air cushion between the output of the amplifier and the relay valve.
  • the shifting of the traversing device is stopped and the pressure in the air cushion drops again. Finally the relay valve opens again, so that the pressure signal from the sensor gets access to the amplifier again. If the traversing mechanism has not moved sufficiently far from the yarn package during this 1 second period, the process described above will be repeated. The traverse mechanism is then further removed from the yarn package for a second period of one second. This is repeated until the traversing mechanism is at a sufficient distance from the yarn package. The duration of the period (in this case 1 second) during which the adjustment takes place has of course been chosen so that the shift occurring in this period is smaller than in the state without the said special precautions. This prevents the hysteresis of the pneumatic amplifier from influencing the adjustment of the traversing mechanism.
  • the traversing mechanism Whenever the pressure signal from the sensor exceeds the response value of the amplifier, the traversing mechanism will introduce one Correction step of a certain size that is smaller than the shift that occurs without the special precautions described.
  • a disadvantage of this known embodiment is that the sensor signal has no influence on the displacement during the correction steps. There can be no question of a control circuit by means of which the distance between the traversing mechanism and the yarn package is continuously compared with the desired distance during the correction movement.
  • the known device carries out correction steps of a fixed size and decides after each correction whether a next correction step should be taken.
  • the sensor signal can continuously influence it during the displacement of the traversing device; as soon as the pressure of the sensor signal drops below the second threshold pressure, the displacement of the traversing device with respect to the yarn package is stopped.
  • the logic control device stops the displacement movement of the traversing device with respect to the yarn package when the pressure in the catching nozzle drops below the second threshold pressure.
  • this always means a relative movement of the traversing device with respect to the yarn package. This relative movement can be a translatory movement of the traversing member alone or of the yarn package alone.
  • the logic control device of the device can preferably have two pneumatic threshold value switches connected to the collecting nozzle.
  • the position of the traversing device relative to the yarn package is explained with reference to FIG. 1.
  • a large number of spun fibers emerge from the schematically indicated melt spinning device 1 and are subsequently combined to form a bundle 2.
  • the bundle 2 - hereinafter referred to as yarn - is guided to a traversing device.
  • a “traversing device” is to be understood as a device which gives the yarn a traversing movement transverse to its running direction in order to enable the yarn to be wound onto a bobbin.
  • Different constructions for the traversing device can be used for this purpose. E.g. it can be designed as a thread guide which is guided to and fro by a rod.
  • the traversing device can have a thread guide which partially engages in a helical groove which is embedded in the jacket of a roller. By rotating the roller, the thread guide is given a back and forth movement.
  • the traversing device in addition to the above-mentioned combination of thread guide and associated drive (traversing roller) additionally comprises a driven grooved roller. This grooved roller can give the yarn a reciprocating motion just before it is wound onto the core. In the case of such an arrangement, the yarn first runs through the reciprocating thread guide and then through the groove of the driven grooved roller.
  • the traversing device comprises a reciprocating thread guide 3, which is driven by a traversing roller 4 with a thread-like groove, and a grooved roller 5, which is driven by a motor, not shown in FIG. 1 .
  • a yarn package 6 which is wound on a sleeve 7, arranged on a drive shaft 8.
  • the drive shaft 8 is driven in rotation by the motor 9.
  • the yarn package 6 together with the traversing device - in this case with the grooved roller 5 - forms the boundary of a narrow air gap 10 which extends in the axial direction of the yarn package.
  • a pneumatic sensor which consists of an air duct 11, the left end 12 of which is close to the air gap 10, is arranged near the circumferential surface of the yarn package.
  • two air lines are connected on both sides, one of which is designated by the reference number 14 in FIG. 1. Both air connections are each connected via a line to a pneumatic control device 15, so the connection 14 via line 16.
  • a main air stream is supplied through one of the ducts to the duct 11, through which it passes transversely to the longitudinal direction of said duct; It is then returned to the control device 15 via another air line.
  • the rotation of the yarn package in the direction indicated by arrow 17 in FIG. 1 causes a tangential air flow, which is designated by 18.
  • the strength of the tangential air flow 18, which flows in the air duct 11, changes with the width of the air gap 10.
  • the pneumatic control device 15 is connected to a displacement device 19 which moves the grooved roll 5 away from the yarn package when the latter grows in diameter.
  • the required connection between the displacement device 19 and the grooved roller 5 is indicated schematically in FIG. 1 by a dashed line 20.
  • the pneumatic sensor 11 and the traversing roller 4 with the thread guide 3 are also connected to the displacement device 19, as shown by the broken lines 21 and 22.
  • the grooved roller 5, the pneumatic sensor 11 and the traversing roller 4 are moved further with the thread guide 3 as a whole.
  • the control of the displacement device 19 by the control device takes place via the line 23. This control can be carried out pneumatically, hydraulically or electrically.
  • FIG. 2 On its way to the yarn package 6, the yarn 2 runs over the thread guide 3 (not shown in FIG. 2) and then through the helical groove 24 in the lateral surface of the grooved roller 5.
  • the path of the last thread turn placed on the yarn package is in FIG. 2 designated with the reference number 25.
  • Grooved roller 5 is supported with its shaft ends in support plates 26 and 27 of a support bridge 28. The left, visible shaft end is designated by the reference number 29.
  • the grooved roller is driven by an electric motor 30, the stator 31 of which is attached to the support bridge 28.
  • the support bridge 28 carries the traversing roller 4 with the thread guide 3 (not visible in FIG. 2).
  • the support bridge 28 can move upwards under the action of the pneumatic cylinder (displacement device) 19.
  • the piston of the pneumatic cylinder 19 is connected to the support bridge 28 by means of a piston rod 20.
  • the support bridge 28 is guided by guide rods 32 and 33.
  • the left end 12 of the air channel 11 opens, which acts as a pneumatic sensor.
  • Said end 12 extends over a considerable part of the length of the yarn package 6 in order to compensate as far as possible for the influence of local fluctuations in the length of the air gap.
  • a jet nozzle 14 and a catch nozzle 34 are attached.
  • nozzles are connected via flexible tubes (hoses) 16 and 35 to the pneumatic control device 15, which comprises a set of units 36 to 41 arranged on a frame 42.
  • the control device is connected via compressed air lines 43 and 44 to a compressed air source (not shown) which can be connected to the pneumatic cylinder (displacement device) 19 by the unit 41 and the air line 23.
  • Another compressed air line 45 conveys compressed air to the unit 36.
  • the tangential air flow 18 collected in the air duct 11 then meets the main air flow 46 between the jet nozzle 14 and the collecting nozzle 34 at the end 13 of the duct.
  • the diagram in FIG. 3 shows in which way the tangential air flow 18 controls the position of the support bridge 28 to which the traversing device is attached.
  • Compressed air flows through the air line 45 via the throttle 36 and a line 16 to the jet nozzle 14 on the pneumatic sensor 11.
  • the air emerging from the jet nozzle 14 flows in the direction of the catch nozzle 34, which is arranged on the sensor 11 opposite the catch nozzle.
  • the inlet of the jet nozzle is connected via line 47, a throttle 37, lines 48 and 35 to the outlet of the catching nozzle 34.
  • the line 35 is also connected to a first threshold switch 38 and through a line 49 to a second pneumatic threshold switch 39.
  • the threshold switch 38 establishes a connection to the control valve 41 via a line 50, a NOT element 40 and a line 51.
  • the threshold switch 39 establishes a connection to the valve 41 via the line 52.
  • the threshold switches 38 and 39 and the NOT element 40 are connected to the compressed air source, which is not shown in detail in FIG. 3.
  • Compressed air now flows through the last-mentioned line to the pneumatic cylinder (displacement device) 19, on which the support bridge with the traversing device is moved upwards by means of its piston 20, so that the width of the air gap 10 becomes larger. While the air pressure in line 35 and thus also in line 49 has the value 1 ", the air pressure in line 52 behind the second threshold switch 39 corresponds to the value" 0 ".
  • the adjustment of the traversing device causes the width of the air gap 10 to increase, as a result of which the strength of the tangential air stream 18 increases.
  • the air pressure in the collecting nozzle 34 and consequently also the pressure in the lines 35 and 49 decrease and, if appropriate, reach a threshold value P 2 ( p 2 ⁇ P,) which corresponds to "0".
  • the second threshold switch 39 now brings the pressure in line 52 to the value "1". Since the pressure in line 51 has meanwhile dropped back to the value "0", the control valve 41 will assume a position under the influence of the pressure in line 52, in which the connection of compressed air line 44 to line 23 is interrupted.
  • the movement of the traversing device away from the yarn package is now stopped. It is also possible to control the breadth of the air gap 10 in that, in addition to the correction movement of the traversing device in the direction away from the bobbin winding, a correction movement is carried out on the yarn winding.
  • threshold switches 38 and 39 provide a logical inversion of their input signals. So in the case of the input signal "1" they deliver the output signal "O" - and vice versa. Basically, therefore, the combination of the threshold switch 38 and the NIGHT element 40 could be replaced by a threshold switch which does not cause a reversal. However, it has been found that the said combination of components achieves a more stable positioning.
  • Pneumatic threshold switches which are available under the trade name DRELOBA, are used as elements 38 and 39. Then the threshold value (P 1 or P 2 ) can be set.
  • Fig. 4 denotes a spinning device through which a number of fibers are spun into a yarn 2. Without a speed-sharing device such as To run over a godet, the yarn is wound up into a winding 6 which is driven by a motor 9 to rotate.
  • Two detectors 53 and 54 for measuring static electricity are arranged at a distance L from one another near the path of the yarn 2.
  • the two detectors consist of electrodes 55 and 56 and correspondingly from signal amplifiers 57 and 58. The detectors do not touch the yarn.
  • An electrostatic charge present on the yarn induces alternating voltages in the electrodes 55 and 56, which are amplified by the amplifiers 57 and 58. These amplified voltages x (t) and y (t) are led to a correlation device 61 via the connections 59 and 60. From this, the correlation device 61 derives a signal which is at least approximately the correlation function reproduces. This signal is ge via the connection 62 to the extreme value-seeking circuit 63 conducts, which serves to find the value ⁇ for which the function ⁇ xy ( ⁇ ) has a maximum. Systems for determining the max. The value of a function is known per se.
  • the circuit 63 adjusts the setting of the delay time in the correlator 61 via a correction device 64 and the lines 65 and 66.
  • the signal representing the delay time ⁇ is also passed via a connection 67 to the computer 68.
  • the latter outputs a signal to terminal 69, which is the quotient corresponds, where L is the distance between the sensors 53 and 54, ⁇ is the set delay time and Vg is the yarn speed to be calculated.
  • the signal from the computer 68 is passed to an automatically operating control unit 70, which serves to regulate the speed of the motor 9 in such a way that the winding speed V, of the yarn is kept at a desired value V.
  • This value is set on the control unit 70, as indicated schematically by the line 71.
  • the connection of the controller 70 to the take-up motor 9 is indicated by the reference number 72 and the drive shaft for the yarn package by the dashed line 8.
  • FIG. 5 Another embodiment of the control system according to the invention is shown in FIG. 5.
  • the extreme value searching device 63 is connected to an automatic control device 70 via a connection 74.
  • the control device 70 serves to set the drive motor 9 to such a speed that the correlation function ⁇ xy ( ⁇ ) reaches its maximum.
  • the embodiment according to FIG. 5 in its entirety presents itself as an extreme value-seeking device which is aimed at maximizing the correlation function ⁇ xy ( ⁇ ) by varying the speed of the motor 9.
  • the signals from the detectors 53 and 54 for detecting electrostatic charges are passed back to the correlator 61.
  • the signal y (t) of the detector 54 is first differentiated into y '(t) by the RC element 75-76.
  • the correlator 61 has two polarity detectors in the form of comparators 77 and 78, to which the signals x (t) and y '(5) are fed.
  • the comparators are set to a reference voltage "0" at which they provide a square wave voltage which is positive ("1") when the input signal is positive and which is zero ("0") when the input signal is negative. In this way, the output signals of the comparators indicate the polarity of the corresponding input signals. They are to be designated with sign x (t) and sign y '(t).
  • the output signal of the comparators does not necessarily have to vary between a positive value and "O", as is the case when the logic system used is of the TTL type. It is also possible to design the circuit so that this signal varies between a positive and a negative value.
  • the output signal of the comparator can be positive if the input signal is positive and negative if the input signal is negative. It is also conceivable to set a reference voltage on the comparators which has a value deviating from "0". It is assumed here that, apart from the delay time, which is caused by the distance between the two detectors 53 and 54, the input signals of the two comparators are very similar both in shape and in amplitude.
  • the output signals of the comparators 77 and 78 are fed via lines 79 and 80 to a shift register 81 and a multiplier 82.
  • the shift register 81 serves to delay the passage of the signal denoted by sign x (t) to the multiplier 82 for a time T.
  • the elements of the shift register are connected to a pulse generator 84 by a schematically indicated line 83.
  • the latter is of the type that converts a voltage into a pulse train whose pulse repetition frequency is proportional to the level of the input voltage.
  • the output signal of the comparator 77 becomes after a delay time appear at the outlet of the shift register 81.
  • This outlet signal sign is sent to multiplier 82 over line 85.
  • the multiplier 82 is a logic circuit which supplies an output signal Z to be passed on via line 86.
  • This output signal depends on the input signals x, y according to the following table:
  • the multiplier 82 only outputs an output signal "1" if the polarity of the two input signals via the connections 85 and 80 is the same.
  • the logic circuit should therefore have the function: where X and Y represent the signals at the inputs of the multiplier. It will now be clear that the closer the time delay lies, the output of the multiplier 82 will have the value "1" the longer.
  • the shift pulse generator should deliver 84 pulses, the frequency of which is the value corresponds.
  • the input of the shift pulse generator 84 is connected to the output of the multiplier 82 via lines 88 and 87, integrator 89 and line 86.
  • the multiplier 82 will deliver an output signal "0". This is determined by the integrator 89 as a deviation, which appears integrated at the output 87.
  • the frequency of the shift pulse generator 84 is changed in such a sense that the value of comes closer.
  • a state arises in which the integrator 89 also applies a voltage U to the shift pulse generator delivers. Since the tension U is proportional to f., U is also a measure of the yarn speed V g . From U c. f s follows that is.
  • the output voltage U is passed on to the controller 70 via the connections 87 and 69.
  • the setpoint for the desired yarn speed was set on this controller. This setting option is indicated schematically in FIG. 6 by arrow 71.
  • the controller 70 - of the PI type - is connected via the connection 72 to an inverter 90 for supplying the drive motor 9.
  • the three-phase motor 9 is a three-phase synchronous motor. It is fed by the inverter 90 via a cable 91.
  • the inverter 90 outputs a three-phase current, the frequency of which depends on the level of the DC voltage output by the control device 70.
  • the speed of the drive motor 9 is consequently to be controlled with the input voltage coming via the connection 72.
  • the inverter is of a type known per se and consists of a converter which converts direct voltage into a three-phase signal of a certain frequency and a power amplifier.
  • the PI controller 70 changes the input voltage of the inverter so that the yarn speed Vg is returned to the desired value V. In this way, the yarn speed in the spinning zone can be kept at a desired value V without the yarn having to pass a godet before it reaches the yarn package, which would give it the speed V.
  • the grooved roller 5 can function as a so-called lead roller. This means that the peripheral speed of the grooving roller 5 is greater than the yarn speed, whereby the yarn tension after the yarn has passed the grooving roller is lower than before.
  • Such a reduction in tension can of course only be achieved if the grooved roll is free-i.e. can turn without touching the twine. In other words, tension cannot be reduced with a roller that is in contact with the yarn package.
  • step-up roller e.g. with a trailing roller, the peripheral speed of which is less than the speed of the fed yarn.
  • a wrap angle of 240 ° or greater is recommended.
  • FIG. 7 Another modified exemplary embodiment, which is based on the principle of the speed control device according to FIG. 5, is shown in FIG. 7.
  • This embodiment differs from that according to FIG. 6 in that the shift pulse generator 84 feeds the shift register 81 with shift pulses of a fixed frequency.
  • This frequency obeys the equation: where n is again the number of elements of the shift register 81, L the distance between the detectors 53 and 54 for measuring the static electricity and V the desired yarn speed.
  • the time it takes for the yarn to travel the distance between the two detectors 53 and 54 is The time the signal sign x (t) takes to pass through the n elements of the shift register is As long as these two times differ from one another, the multiplier recognizes, as in the embodiment according to FIG.
  • Controller 70 changes the frequency of the three-phase current supplied by inverter 90 until the false signal from multiplier 82 is eliminated. The moment the times the yarn speed V 9 is again at its desired value V.
  • the time that is available for the yarn to pass through the distance L between the two detectors 53 and 54 applies as the desired value.
  • This desired value is fixed by setting the frequency of the shift pulse generator 84.
  • a logic circuit can be used both in the arrangement according to FIG. 6 and in that according to FIG. 7, which instead of the function their inverse function known as the "EXCLUSIVE OR" function:
  • FIG. 8 Another variant of the speed control system is shown in FIG. 8. This system differs from the ones described above in that the signal y (t) of the detector 54 is not differentiated.
  • the input of the penultimate element 92 of the n-bits shift register 81 is connected to a first multiplier 94 via the connection 93.
  • the other input of the multiplier 94 is connected to the output of the comparator 78 by means of the connections 95 and 80.
  • the last shift register element 96 and the comparator 78 are connected to a multiplier 82.
  • the outputs of the multipliers 82 and 94 are connected via connections 86 and 97, respectively, to an electronic counter 98, to which 99 pulses of a very constant frequency are supplied by a clock pulse generator 100 via a line.
  • the counter 98 outputs its signal via a line 101 to a digital-to-analog converter 102, which in turn outputs its analog output signal to an amplifier 105 via connections 103 and 104.
  • the amplifier 105 supplies the amplified analog signal via a connection 106 to the shift pulse generator 84.
  • This pulse generator sends shift pulses via line 83 to the shift register 81.
  • the digital-to-analog converter 102 is connected to the controller 70 via a connection 107.
  • the correlator 61 is set at a yarn speed V 9 . Then the digital-to-analog converter 102 delivers a signal corresponding to the yarn speed V to the automatic control device 70. If the value of this signal is equal to the desired value V set at the connection 71, the speed of the drive motor 9 is kept at the preselected value.
  • the time required for the yarn to travel through the distance L between the detectors 53 and 54 is then, as follows:
  • the delay caused by the first n-1 elements of the shift register is therefore
  • the time delay of the first n-2 elements of the shift register is and for all n elements
  • the signal at terminal 93 is thus sign the signal at connection 85 is sign
  • the signal sign is between the elements 92 and 96
  • the latter signal corresponds to the signal sign since it is assumed that
  • the signal at terminal 93 is thus just as much before the signal sign how the signal at port 85 is behind this. (see Fig. 9).
  • the multipliers 94 and 82 that both formed by an "EXCLUSIVE-OR" element, provide signals Z, and Z 2 , as indicated in FIG. 9.
  • the counter 98 works in such a way that the pulses Z 2 on the terminal 86 increase the counter reading, the pulses Z, on the other hand decrease the counter reading on the terminal 97. In the state shown in FIG. 9, in which each pulse Z is followed by a pulse Z 2 of the same duration, the count of the counter remains unchanged in terms of content.
  • the number of clock pulses coming from the clock pulse generator 100 which increases the counter reading during the duration of a pulse Z, is always equal to the number of clock pulses with which the counter reading is reduced again during a subsequent pulse Z 2 .
  • the digital-to-analog converter 102 converts the counter reading of the counter 98 into a proportional analog signal which, after amplification in the amplifier 105, sets the frequency f s of the shift pulse generator 84 to a value corresponding to the counter reading. In accordance with the extent to which the yarn package grows, the peripheral speed of the package and thus the yarn speed gradually increases.
  • the time difference between the signals arriving at the multiplier 94 and sign y (t) now decreases, while the shift times between the input signals sign and sign y (t) increase at multiplier 82.
  • the width of the pulses Z becomes smaller, while that of the pulses Z z, on the other hand, increases.
  • the counter 98 is then supplied with more clock pulses per unit of time which increase the counter reading than those which reduce it. The content of the counter is therefore higher, so that the speed signal at connection 107 also increases.
  • the controller 70 responds to this deviation by reducing the frequency of the inverter 90, thereby bringing the yarn speed back to its desired value.
  • a third multiplier the inputs of which are connected to the outlet of the (n-1) th element 92 of the shift register, and the line 80 make it possible to optically and / or acoustically signal if the equality is reached, in this case the output signal of the third multiplier will practically continuously have the height "0" or "1", depending on whether the logic function X. Y + X. Y or X. Y + X. Y is shown.
  • the invention can also relate to a device for winding a plurality of yarn packages.
  • a common correlator can be used for a large number of winding positions, which is connected in succession to the yarn speed sensors of all winding positions.

Landscapes

  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Structural Engineering (AREA)
  • Winding Filamentary Materials (AREA)
  • Spinning Or Twisting Of Yarns (AREA)
  • Filamentary Materials, Packages, And Safety Devices Therefor (AREA)
EP78100478A 1977-07-22 1978-07-21 Vorrichtung zum Aufwickeln von Garn Expired EP0000721B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NL7708149 1977-07-22
NL7708149A NL7708149A (nl) 1977-07-22 1977-07-22 Inrichting voor het opwikkelen van een garen.

Publications (2)

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EP0000721A1 EP0000721A1 (de) 1979-02-21
EP0000721B1 true EP0000721B1 (de) 1982-05-26

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EP78100478A Expired EP0000721B1 (de) 1977-07-22 1978-07-21 Vorrichtung zum Aufwickeln von Garn
EP78100477A Expired EP0000569B1 (de) 1977-07-22 1978-07-21 Vorrichtung zum Aufspulen von Garnen

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US (1) US4169565A (nl)
EP (2) EP0000721B1 (nl)
JP (1) JPS5438942A (nl)
DE (2) DE2860064D1 (nl)
IT (1) IT1106129B (nl)
NL (1) NL7708149A (nl)

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US4244533A (en) * 1979-09-05 1981-01-13 Ppg Industries, Inc. Method of operating an air sensor
JPS5892255U (ja) * 1981-12-14 1983-06-22 帝人株式会社 巻取機における安全装置
EP0134195B1 (en) * 1983-08-02 1987-04-29 Howa Kogyo Kabushiki Kaisha Apparatus for controlling the winding speed of roving in roving frame
EP0188544A4 (en) * 1984-07-02 1987-09-08 Frances H White WINDING DEVICE AND METHOD.
US4688734A (en) * 1985-06-28 1987-08-25 Dixie Yarns, Inc. Apparatus and method for tensionless winding of low modulus elastic yarns into a cylindrical package for uniform dyeing
US4615495A (en) * 1985-06-28 1986-10-07 Dixie Yarns, Inc. Cylindrical package of low modulus, highly elastic yarn
US5277373A (en) * 1991-12-18 1994-01-11 Morton Henry H Apparatus and method for controlling tension in a moving material
DE4225842A1 (de) * 1992-08-05 1994-02-10 Schlafhorst & Co W Vorrichtung zum Messen der Geschwindigkeit von Textilfäden an einer Wickeleinrichtung
DE4434234C2 (de) * 1994-09-24 2003-06-26 Schlafhorst & Co W Vorrichtung zum Bestimmen der Geschwindigkeit eines in Richtung seiner Längsausdehnung bewegten Textilgutes, insbesondere eines Textilfadens
US6499688B1 (en) 1996-07-29 2002-12-31 Ccs Holdings, Inc. Optical fiber ribbon winding apparatus and method
US5996925A (en) * 1997-03-03 1999-12-07 Toray Engineering Co., Ltd. Method and apparatus for detecting yarn tension and method for winding yarn
GR1003684B (el) * 2000-11-09 2001-10-03 Νικολαος Καλαιτζης Μεθοδος και συσκευη μετρησης μηκους και ταχυτητας παραδοσεως νηματος με χρηση ζευγους οπτικων αισθητηρων και προσαρμοστικου ψηφιακου ετεροσυσχετιστη σηματων.
DE10118660A1 (de) † 2001-04-14 2002-10-17 Schlafhorst & Co W Garnreinigungseinrichtung an der Spulstelle einer Textilmaschine
EP1256540A3 (en) * 2001-05-11 2003-07-16 Murata Kikai Kabushiki Kaisha Yarn winding machine and yarn winding method
DE102007011499B3 (de) * 2007-03-07 2008-07-03 Vienco Gmbh Verfahren und Anordnung zur Überwachung und Optimierung eines Spulprozesses

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DE1535086A1 (de) * 1965-03-05 1970-04-09 Alucolor Fmn Schuster & Co Verfahren zur Geschwindigkeits- und Laengenbestimmung von Textilfaeden
JPS4824983B1 (nl) * 1968-01-27 1973-07-25
CH554285A (it) * 1971-04-15 1974-09-30 Savio Spa Procedimento par azionare i rocchetti e regolare la velocita periferica dei rocchetti nelle macchine roccatrici e/o binatrici di filati e dispositivo per l'esecuzione del procedimento.
DE2219755C3 (de) * 1972-04-21 1978-04-06 Siemens Ag, 1000 Berlin Und 8000 Muenchen Vorrichtung zum Konstanthalten des Fadenzuges an Präzisionskreuzspulmaschinen
FR2182381A5 (nl) * 1972-04-28 1973-12-07 Saint Gobain Pont A Mousson
US3931938A (en) * 1974-03-18 1976-01-13 Toray Industries, Inc. Method and apparatus for winding yarn into yarn package

Also Published As

Publication number Publication date
JPS5438942A (en) 1979-03-24
JPS6115020B2 (nl) 1986-04-22
IT1106129B (it) 1985-11-11
IT7850331A0 (it) 1978-07-17
US4169565A (en) 1979-10-02
NL7708149A (nl) 1979-01-24
EP0000721A1 (de) 1979-02-21
DE2861864D1 (en) 1982-07-15
EP0000569B1 (de) 1980-07-23
EP0000569A1 (de) 1979-02-07
DE2860064D1 (en) 1980-11-13

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