EP2955142B1 - Method for eliminating a loop of yarn when winding yarn on a cross-wound bobbin on a spinning machine at a constant speed of the yarn being produced and a device for performing it - Google Patents

Method for eliminating a loop of yarn when winding yarn on a cross-wound bobbin on a spinning machine at a constant speed of the yarn being produced and a device for performing it Download PDF

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Publication number
EP2955142B1
EP2955142B1 EP15164865.6A EP15164865A EP2955142B1 EP 2955142 B1 EP2955142 B1 EP 2955142B1 EP 15164865 A EP15164865 A EP 15164865A EP 2955142 B1 EP2955142 B1 EP 2955142B1
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EP
European Patent Office
Prior art keywords
yarn
capturing
way controlled
reversible
guiding means
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EP15164865.6A
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German (de)
English (en)
French (fr)
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EP2955142A1 (en
Inventor
Jiri Sloupensky
Milan Moravec
Miroslav Stusak
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Rieter CZ sro
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Rieter CZ sro
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    • 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
    • B65H59/005—Means compensating the yarn tension in relation with its moving due to traversing 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 method of operating of a device for eliminating of yarn loop when winding yarn on a cross-wound bobbin at an operating unit of a spinning machine with a constant speed of the yarn being produced, in which during the production of the yarn the length of the working path of the yarn between a draw-off mechanism and a winding device periodically varies and the loop is eliminated by deflecting the yarn with a capturing and guiding means of a compensatory arm, which is fixedly mounted on an output element of reversible two-way controlled means connected to control mechanism.
  • the invention also relates to a device for eliminating a loop of yarn when winding yarn on a cross-wound bobbin on a spinning machine at a constant speed of the yarn being produced, which comprises a movable compensatory arm with a capturing and guiding means of yarn, whose path intersects the path of the yarn between the draw-off mechanism and the yarn winding device the compensatory arm is fixedly mounted on an output element of a reversible two-way controlled means connected to a control system.
  • the yarn is periodically slackened.
  • various compensators comprising a compensatory arm, which by one of its ends acts upon the yarn, lengthening or shortening the working path of the yarn at the operating unit in the relevant section between the draw-off mechanism of yarn and the winding device of yarn as required.
  • the compensatory arm also maintains a constant tension in the yarn, which is essential for the correct bobbin winding.
  • Known compensators comprise a reciprocating compensatory arm, which is swingingly mounted and coupled to a spring, which acts upon the arm in such a manner that the compensatory arm with its free end intersects transversely the working path of the yarn, acting upon the yarn by a defined force in a spring-loaded manner, by which means not only is the required tension in the yarn created, but at the same time the yarn, which is being slackened as a result of winding, is periodically and reversibly deflected from the straight-line working path, thereby eliminating the loop of yarn, which is periodically formed.
  • US 6 375 112 B1 discloses a device for controlling a compensator during the continuous process of spinning yarn. US 6 375 112 B1 resolves this solely in dependence on several sensors of other parts of the machine, such as the sensor of the position of the traversing yarn guide of the winding device, a sensor of the winding speed, a sensor of the tilt angle of the arms holding a bobbin being wound, etc. From the data of all these sensors a relatively demanding computing process calculates the angle of rotation and the direction of the movement of the motor shaft, on which an arm with a guide pulley is mounted.
  • EP 2 684 827 A2 describes solution exclusively designed as a drum-arm assembly and both the drum and the arm cannot work independently of each other.
  • the arm here fulfils the role of the activator of drum filling, i.e. the activator of the amount of yarn (yarn length) wound on the drum during the yarn production, whereby both during the continuous yarn production and during the transient states, as well as during the attending operations at the working unit, mutual relations between the speed and the direction of the rotation of the drum and the speed and the direction of the rotation of the arm are controlled.
  • the movement of the arm is dependent on the drum rotation, whereby the speed of the drum rotation depends on the draw-off speed of yarn, the speed of winding being adapted to it.
  • the goal of the invention is primarily to improve the elimination of a yarn loop when winding yarn on a cross-wound bobbin on a spinning machine at a constant speed of the yarn being produced and improve the parameters of the device used for eliminating a yarn loop.
  • the aim of the invention is achieved by a method, whose principle consists in that the control mechanism controls position and/or direction and/or speed and/or force application of the reversible two-way controlled means according to the operation that is being carried out at the operating unit and during the transition from the continuous spinning of the yarn to a transient state and, vice versa, during the transition from a transient state to the state of the continuous spinning of the yarn, the control of the speed and/or torque of the two-way controlled means and the control of the force applied by the capturing and guiding means of the compensatory arm on the yarn being produced and wound, is currently adjusted and is carried out according to the particular requirements of the automation operations being performed at the operating unit, while the capturing and guiding means of yarn performs a two-way controlled reciprocating motion along a circular path, the capturing and guiding means of yarn being arranged directly at the outlet of the yarn from the draw-off mechanism of yarn or the capturing and guiding means of yarn being arranged between a pair of mutually spaced support guides of yarn and performing its
  • control system is equipped with means for controlling the position and/or direction and/or speed and/or force application of the output element of the reversible two-way controlled means and for controlling the speed and/or torque of the two-way controlled means and the force applied by the capturing and guiding means of the compensatory arm on the yarn being produced and wound during the transition from the continuous spinning of the yarn to a transient state and, vice versa, during the transition from a transient state to the state of the continuous spinning of the yarn according to the particular requirements of the automation operations being performed at the operating unit, while the capturing and guiding means of yarn performs a two-way controlled reciprocating motion along a circular path, the capturing and guiding means of yarn being arranged directly at the outlet of the yarn from the draw-off mechanism of yarn or the capturing and guiding means of yarn being arranged between a pair of mutually space
  • the advantage of this solution is the fact that the compensatory arm is driven by an independent means which is controlled via the control system in such a manner that the speed of the compensatory arm and the torque generated by it are, in case of need, controlled independently of the speed of the yarn motion and the bobbin speed, which broadens the possibilities of using the device for eliminating a loop not only during the process of the continuous winding of a cross-wound bobbin, but also for the automation of attending operations at a operating unit of a textile machine producing cross-wound bobbins at a constant speed of the yarn being produced.
  • the angular momentum of the compensatory arm by means of its own independent two-way controllable reversible means is set according to the required tension in the yarn and at the same time it is also slightly regulated, for example with the aid of a sensor located close to the middle of the working path of the compensatory arm or with the aid of a detector of the reversible two-way controllable means, whereby during transition from continuous spinning to a transient state and vice versa the speed and momentum of the compensatory arm depend on the requirements of the automating operations at a particular operating unit.
  • the compensatory arm is deflected so that a compensatory momentum is created by the magnetic field of a permanent magnet, whose basic compensatory activity does not have to be controlled, since the compensatory arm is at its base driven solely by the tensile force of the yarn, a coil with a power source and the control system serving to modify the resulting compensatory momentum which counteracts the tensile force of the yarn, thus making the whole device substantially universal for different types of yarn and different working conditions.
  • the common advantage of the individual embodiments is the fact that it is possible to set the characteristics of these compensators according to the type of the yarn being produced automatically in the whole machine, without having to perform correcting operations at different operating units.
  • Fig. 1 shows a schematic arrangement of a compensator at the outlet from a draw-off mechanism of yarn from a side view
  • Fig. 1a is a front view of a schematic arrangement of the compensator at the outlet from the draw-off mechanism of yarn from a front view
  • Fig. 2 shows a schematic arrangement of the compensator in the travel path of the yarn between the draw-off mechanism of yarn and the yarn winding device
  • Fig. 3 there is a block diagram of a magnetic or electromagnetic means for eliminating a yarn loop.
  • the spinning machine comprises at least one row of identical operating units arranged next to each other, wherein each operating unit comprises a spinning unit, in which yarn is created.
  • a draw-off mechanism 1 of yarn 0 is situated above the spinning unit.
  • the draw-off mechanism 1 of yarn 0 comprises a known pair of draw-off rollers 2, 3, between which the yarn 0 passes and which are rotatably mounted in the framework of the machine.
  • One of the draw-off rollers 2, 3 is coupled to an unillustrated drive and constitutes a driven draw-off roller 2, whereby the other draw-off roller 3 is a pressure draw-off roller 3, which is rotatably mounted on a spring-loaded arm 30, by which it is pressed against the driven draw-off roller 2.
  • a winding device A of yarn 0 on a cross-wound bobbin is located in the path of the yarn 0 behind the draw-off mechanism 1 .
  • the winding device A of yarn 0 comprises a distribution device A1 of yarn 0, by which the yarn 0 being wound is distributed over the width of the bobbin A2.
  • a device for eliminating a loop of yarn is arranged at an operating unit in the path of the yarn 0 between the draw-off mechanism 1 and the winding device A.
  • the device for eliminating a yarn loop comprises a reversible two-way controlled means 4, such as an electrical, magnetic or pneumatic rotary means 4, on whose output shaft 5 is fixedly mounted at one of its end a compensatory arm 6, or an electrical or pneumatic or magnetic linear means 4, on whose output rod is mounted the compensatory arm 6.
  • a reversible two-way controlled means 4 such as an electrical, magnetic or pneumatic rotary means 4, on whose output shaft 5 is fixedly mounted at one of its end a compensatory arm 6, or an electrical or pneumatic or magnetic linear means 4, on whose output rod is mounted the compensatory arm 6.
  • the compensatory arm 6 is mounted on the shaft 5 transversely to the longitudinal axis of the shaft 5, i.e. transversely to the axis of the rotation of the shaft 5.
  • the compensatory arm 6 is situated skew in relation to the shaft 5.
  • a capturing and guiding means 7 of yarn 0 At the free end of the compensatory arm 6 is fixedly mounted a capturing and guiding means 7 of yarn 0 , which when eliminating a loop of yarn 0 transversely intersects the working path of the yarn 0 in the space between the draw-off mechanism 1 and the winding device A, which enables the capturing and guiding means 7 of yarn 0 to act upon the yarn 0 during the process of eliminating the yarn loop 0.
  • the capturing and guiding means 7 of yarn 0 When eliminating the yarn loop 0, the capturing and guiding means 7 of yarn 0 performs a two-way controlled reciprocating motion along a circular path 9, which is in the embodiment in Fig. 1 indicated by a dashed line.
  • the capturing and guiding means 7 of yarn 0 is arranged directly at the outlet of the yarn 0 from the draw-off mechanism 1 of yarn 0 and thus the circular path 9 of the capturing and guiding means 7 of yarn 0 passes along a part of the circumference of the driven draw-off roller 2.
  • the capturing and guiding means 7 of yarn 0 is arranged in the space between a pair of mutually spaced support guides of yarn 0, which permit controlled yarn loop formation as well as the control of the loop in the space between the draw-off mechanism 1 yarn and the winding device A of yarn 0.
  • the capturing and guiding means 7 of yarn 0 performs a two-way controlled reciprocating motion along the circular path 9 during the process of eliminating the yarn loop 0.
  • the capturing and guiding means 7 of yarn 0 is arranged in the space between the two mutually spaced support guides of yarn 0, which allow controlled loop formation and the control of the loop of yarn 0 in the path of the yarn 0 in the space between the draw-off mechanism 1 of yarn 0 and the winding device A of yarn 0.
  • the capturing and guiding means 7 of yarn 0 is mounted at the end of a linear reversible two-way controlled means 4 and performs a two-way controlled reciprocating motion along a linear path during eliminating the yarn 0 loop.
  • the reversible two-way controlled means 4 is turned by 90° and its output shaft 5 has a vertical longitudinal axis.
  • the capturing and guiding means 7 of yarn 0 on the compensatory arm 6 transversely intersects the working path of the yarn 0 in the space between the draw-off mechanism 1 and the winding device A, thus moving substantially along a circular path situated in a horizontal plane.
  • the reversible two-way controlled means 4 is set skew in respect to both the horizontal and vertical directions.
  • the longitudinal axis of its output shaft 5 is also situated skew and the capturing and guiding means 7 of yarn 0 on the compensatory arm 6 transversely intersects the working path of the yarn 0 in the space between the draw-off mechanism 1 and the winding device A, moving substantially along a circular path situated in an inclined (skew) plane.
  • the device for eliminating the loop of yarn 0 further comprises a detector of the position of the compensatory arm 6, which is in the illustrated example of embodiment located in the central part of the compensatory arm 6 path under consideration during the reciprocating motion during the operation of eliminating the loop of yarn 0.
  • the detector is excentrically positioned, the excentricity e being oriented in relation to the line joining the axis of the rotation of the shaft 5 of the reversible two-way controlled means 4 and the axis of the rotation of the driven draw-off roller 2.
  • the detector is mounted in the framework of the device at a point opposite a suitable detecting element located directly on the output member of the means 4, the detecting element being formed by a transverse protrusion on the shaft 5 etc.
  • the detector of the position of the compensatory arm 6 enables to monitor the passing of the compensatory arm 6 through the specific section being monitored and adjust the activity of the reversible two-way controlled means 4 accordingly, as will be described hereinafter.
  • the device for eliminating a loop of yarn 0 comprises a pair of mutually spaced detectors which are aligned with the compensatory arm 6, for example, in the end positions of the swinging motion of the compensatory arm 6 or which are aligned with the path of the compensatory arm 6, being mutually spaced outside of the end positions of the swinging motion of the compensatory arm 6 , or also in other suitable positions.
  • the reversible two-way controlled means 4 is aligned with a detector of the position and/or speed of the output element of the reversible two-way controlled means 4, such as the shaft 5 of the rotary means 4, or the output rod of the linear means 4.
  • the detector of the position and/or speed of the motion either constitutes a part of the reversible two-way controlled means 4, or it is composed of an external device aligned in a suitable place with the output element of the particular means 4, for example, with the shaft 5 of the reversible two-way controlled means 4.
  • the detector of the position and/or speed of the motion allows accurate reversible two-way controlled active motion, the accelerating, decelerating, halting etc. of the output means 4 consisting of the compensatory arm 6 and the capturing and guiding means 7 of yarn 0 according to the directions of the control system and according to instantaneous needs of the technological processes at a particular operating unit.
  • the device for eliminating a loop of yarn 0 comprises both the detector of the position of the compensatory arm 6, and the detector of the position and/or speed of the reversible two-way controlled means 4.
  • the reversible two-way controlled means 4 is composed of a brushless rotary electric drive with permanent magnets, the so-called BLDC motor, which has already been provided with a detector of the position and/or speed of the rotation of its shaft 5.
  • the reversible two-way controlled means 4 is formed by a pneumatic rotary motor or by another suitable drive, such as a drive having only a limited range of straight-line reciprocating motion or bi-directional angular displacement or turning.
  • An example of a magnetic, or, more specifically, electromagnetic means 4 with a limited range of bi-directional angular displacement is, for example, a device called a rotary solenoid.
  • FIG. 3 shows a cylindrical two-pole magnet 9, rotatably mounted about its longitudinal axis in a magnetic circuit, such as in a magnetically conductive stirrup 90, which is aligned with a coil 91 connected to a source of electrical energy for the excitation of the coil according to the instructions of the control system. Due to its polarity, the magnet 9 creates a magnetic flux in the stirrup 90.
  • the magnet 9 is connected to the compensatory arm 6 and at standstill its displacement is such that the north pole of the magnet 9 is situated opposite one pole extension of the stirrup 90, whereas the south pole of the magnet 9 is positioned opposite the other extension of the stirrup 90, and therefore the lines of force of the magnetic field pass through the stirrup 90, taking the shortest distance.
  • This embodiment of the means 4 has an important function, namely that when the yarn 0 tries to turn the magnet 9 by means of the compensatory arm 6, a torque is generated on the compensatory arm 6 by the magnetic forces, being proportionate to the displacement of the compensatory arm 6, in other words, the system itself counteracts this displacement by the action of the yarn 0 and stretches the yarn 0, thus compensating for the loop of yarn.
  • the connected coil 91 due to being excited by the electric current I (or by a change in the electric current I ) generates another magnetic flux, which is combined with the magnetic field of the rotating magnet (according to the polarity it is added to it or subtracted from it), by which means the compensatory characteristics of this embodiment of the means 4 is modified, and therefore it is possible to change the character of the compensator from the point of view of the force F acting on it, this being carried out automatically according to the textile parameters, and, what is more, it is even possible to optimize the course of the compensation during one swing of the compensatory arm 6 if the current I running through the coil 91 properly changes over time, for example, by using the method PWM.
  • the compensatory arm 6 it has been found out that it is advantageous to make the compensatory arm 6 from a material enabling achieving sufficient firmness and resistance while maintaining a minimal moment of inertia. It is, for example, advisable to use carbon composites, etc. Also, as far as the material is concerned, it is favourable if the stirrup 90 is made of a magnetically soft steel.
  • the control system controls the illustrated rotary reversible two-way controlled means 4 and its controlled action on the yarn 0, for instance in the so-called torque-speed mode, whereby the control system is either composed of an independent control system for one operating unit, or it is formed by means of a control system of the operating unit or it is composed of a control system common to more operating units, for example, to a section of the machine or it consists of a control unit common to all the operating units of the machine or it consists of means of the control system of the whole machine, etc.
  • the above mentioned torque-speed mode of control of the reversible two-way controlled means 4 enables, if required, to control mutually independently the speed of the motion of the compensatory arm 6, and, therefore, also the speed of the motion of its capturing and guiding means 7, and, in addition, it allows to control the size of the torque on the shaft 5, i.e. to control the force applied by the compensatory arm 6, or, more specifically, by its capturing and guiding means 7, on the yarn 0. Furthermore, this is all achieved regardless the speed of the motion of the drawn-off yarn 0 and the speed of the rotation of the bobbin A2 during the winding of the yarn 0.
  • the torque of the shaft 5, which is converted by the compensatory arm 6 and its capturing and guiding means 7 into a force acting on the yarn 0 being produced and wound, is set during the continuous spinning of the yarn 0 according to the required tension in the yarn 0 and is further more slightly regulated either by means of the detector of the position of the compensatory arm 6, or, more specifically, by means of its capturing and guiding means 7, and/or by means of the detector of the position and/or speed of the rotation of the shaft 5 of the reversible two-way controlled means 4.
  • the torque of the shaft 5 of the reversible two-way controlled means 4 is controlled, for example, by using a method for a modified vector control, in which there are two separate regulator circuits, wherein one regulator circuit is intended to monitor and control the torque of the compensatory arm 6, or, more specifically, of the shaft 5 of the controlled means 4.
  • the controlled means 4 is composed of an electric motor, then it is a case of controlling the magnetic flux of this electric motor.
  • both regulator circuits are made in such a manner that they do not influence each other.
  • the principle of the modified vector control of an electric motor consists in converting the space vector of the stator current into two perpendicular components in a rotating coordinate system, which may be oriented to the space vector of the stator or rotor magnetic flux, or, as the case may be, to the space vector of the resulting magnetic flux.
  • the components of the stator motor current space vector then define the torque and the magnetization of the electric motor constituting the means 4.
  • the torque of the motor is defined by a torque forming component of the stator current vector, as well as by a respective vector of the magnetic flux.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Winding Filamentary Materials (AREA)
  • Spinning Or Twisting Of Yarns (AREA)
EP15164865.6A 2014-06-09 2015-04-23 Method for eliminating a loop of yarn when winding yarn on a cross-wound bobbin on a spinning machine at a constant speed of the yarn being produced and a device for performing it Active EP2955142B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CZ2014-399A CZ305860B6 (cs) 2014-06-09 2014-06-09 Způsob eliminace smyčky příze při navíjení příze na křížem vinutou cívku na dopřádacím stroji s konstantní rychlostí vyráběné příze a zařízení k jeho provádění

Publications (2)

Publication Number Publication Date
EP2955142A1 EP2955142A1 (en) 2015-12-16
EP2955142B1 true EP2955142B1 (en) 2020-06-24

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EP15164865.6A Active EP2955142B1 (en) 2014-06-09 2015-04-23 Method for eliminating a loop of yarn when winding yarn on a cross-wound bobbin on a spinning machine at a constant speed of the yarn being produced and a device for performing it

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EP (1) EP2955142B1 (cs)
CN (1) CN105151894B (cs)
CZ (1) CZ305860B6 (cs)

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LU102827B1 (de) * 2021-06-10 2022-12-12 Saurer Spinning Solutions Gmbh & Co Kg Fadenspeichereinheit für eine Arbeitsstelle einer Textilmaschine

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WO2017144031A1 (en) * 2016-02-24 2017-08-31 Rieter Cz S.R.O. Electromagnetic device for eliminating a yarn loop when winding yarn on a cross-wound bobbin on a spinning machine at a constant speed of the yarn production
CZ2017302A3 (cs) * 2017-05-29 2018-12-12 Rieter Cz S.R.O. Elektromagnetický aktivní kompenzátor smyčky příze na pracovním místě textilního stroje a způsoby jeho řízení
CZ2017798A3 (cs) 2017-12-13 2019-06-26 Rieter Cz S.R.O. Způsob řízení kompenzátoru rozdílu odtahové a navíjecí rychlosti příze při navíjení příze na cívku na pracovním místě dopřádacího stroje a zařízení k jeho provádění
DE102018007591A1 (de) * 2018-09-26 2020-03-26 Saurer Spinning Solutions Gmbh & Co. Kg Verfahren und Vorrichtung zum Detektieren einer Fadenschlinge bei einer Arbeitsstelle einer Auflaufspulen herstellenden Textilmaschine
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CZ2019198A3 (cs) * 2019-03-29 2020-10-07 Rieter Cz S.R.O. Způsob řízení prostředků pracovního místa textilního stroje a zařízení k jeho provádění
CZ2019651A3 (cs) 2019-10-21 2021-04-28 Rieter Cz S.R.O. Způsob pohonu mechanického prvku obsahujícího přízový záchyt na textilním stroji, zařízení pro pohyb přízí na textilním stroji a textilní stroj
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Publication number Publication date
CZ2014399A3 (cs) 2016-04-13
EP2955142A1 (en) 2015-12-16
CN105151894B (zh) 2020-11-13
CN105151894A (zh) 2015-12-16
CZ305860B6 (cs) 2016-04-13

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