EP3749603B1 - Procédé et système d'alimentation en fil d'optimisation de l'alimentation en fil d'une machine textile fonctionnant de manière très discontinue ou à mouvement alternatif - Google Patents

Procédé et système d'alimentation en fil d'optimisation de l'alimentation en fil d'une machine textile fonctionnant de manière très discontinue ou à mouvement alternatif Download PDF

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Publication number
EP3749603B1
EP3749603B1 EP19703785.6A EP19703785A EP3749603B1 EP 3749603 B1 EP3749603 B1 EP 3749603B1 EP 19703785 A EP19703785 A EP 19703785A EP 3749603 B1 EP3749603 B1 EP 3749603B1
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EP
European Patent Office
Prior art keywords
yarn
tension
arm
compensating
take
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EP19703785.6A
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German (de)
English (en)
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EP3749603A1 (fr
Inventor
Tiziano Barea
Massimo Tomazzolli
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BTSR International SpA
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BTSR International SpA
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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
    • B65H51/00—Forwarding filamentary material
    • B65H51/20—Devices for temporarily storing filamentary material during forwarding, e.g. for buffer storage
    • B65H51/22—Reels or cages, e.g. cylindrical, with storing and forwarding surfaces provided by rollers or bars
    • 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
    • B65H59/10—Adjusting or controlling tension in filamentary material, e.g. for preventing snarling; Applications of tension indicators by devices acting on running material and not associated with supply or take-up devices
    • B65H59/36—Floating elements compensating for irregularities in supply or take-up of material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H51/00—Forwarding filamentary material
    • B65H51/20—Devices for temporarily storing filamentary material during forwarding, e.g. for buffer storage
    • 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
    • B65H59/388—Regulating forwarding speed
    • D—TEXTILES; PAPER
    • D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
    • D04B—KNITTING
    • D04B15/00—Details of, or auxiliary devices incorporated in, weft knitting machines, restricted to machines of this kind
    • D04B15/38—Devices for supplying, feeding, or guiding threads to needles
    • D04B15/48—Thread-feeding devices
    • 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
    • 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
    • B65H2701/36—Wires

Definitions

  • the object of the present invention is a method for feeding yarn to a machine that processes it according to the precharacterising clause of the principal claim.
  • a system according to the precharacterising clause of the corresponding independent claim is also the object of the invention.
  • Constant tension yarn feeders have long been known for feeding a yarn or wire to a textile machine, either to produce a finished manufactured article (e.g. a knitted article or a sock) or to process that yarn, possibly in combination with other yarns (e.g. machines for preparing yarn for subsequent uses).
  • a finished manufactured article e.g. a knitted article or a sock
  • other yarns e.g. machines for preparing yarn for subsequent uses.
  • known devices for feeding yarn of the type capable of feeding yarns (including metal wires) or (textile/technical) yarns at constant tension are known.
  • Said devices operate according to a known closed-loop control principle implemented through a known constant tension yarn feeder.
  • the method of control ensures that a yarn or wire is regularly fed at constant tension regardless of the rate of feed of said yarn and also regardless of changes in the tension of the yarn at the intake to said constant tension yarn feeder; all this whether the changes in tension are due to gradual emptying of the yarn bobbins or whether such changes are due to tears or additional tensions deriving from irregular unwinding of said yarns.
  • a known constant tension yarn feeder of the type mentioned above is, for example, the object of EP1492911 in the name of the same Applicant; this prior text describes a feeder comprising a tension sensor, an actuator or motor acting on a feed wheel or pulley and a control unit (or electronics) capable of assessing the tension in the yarn measured by the aforementioned sensor by comparing it with a desired working tension (or SET POINT). On the basis of this comparison the control unit acts on the motor so as to act on the pulley connected to it by braking or feeding the yarn so as to modify or maintain the tension in yarn fed to a textile machine constant (for the production of a manufactured article or for processing the yarn itself).
  • a constant tension yarn feeder comprising means, for example a load cell, capable of measuring the tension of the controlled yarn in real time, a pulley on which the yarn is wound with one or more turns, an electric motor which drives the pulley in rotation and control electronics which, depending on the tension of the measured yarn, regulate the rotation speed of the motor and consequently of the pulley to keep the measured tension in line with a predetermined and programmable value, possibly a function of the operating stage of the textile machine, is known.
  • Rotation of the motor is generally controlled in two directions, the first to deliver yarn to the machine, the second to recover it from the machine during stages of stopping or reversal to prevent yarn from becoming slack and to maintain it always at the desired tension.
  • this type of feeder device is able to keep the measured tension constant as the feed conditions change (variable yarn tension at the feeder intake, changes in rate of feed, etc.). Obviously, since there is no slip, under these working conditions the feeder is able to keep the measured tension perfectly in line with the set value and at the same time accurately measure the quantity of yarn fed, this being another fundamental parameter to ensure the quality of the finished manufactured article.
  • a feeder system including a compensator device which is connected upstream of the feed (of the type described above) and which by acting together with the yarn helps to overcome the limitations described above is known from EP2262940 , in the name of the same Applicant.
  • this system requires that it be routed to a movable arm of the compensator device and then redirected to the load cell of the feeder.
  • the compensator device lies within a control loop (tension measured with respect to the speed of the feed pulley) to ensure that the yarn tension remains constant as the position of the movable arm varies.
  • the movable arm acts as a compensator device located between the pulley (on which the yarn accumulates) and the tension detection means (load cell) and is capable of compensating for changes in the conditions under which yarn is fed or taken up as it passes through each condition in which it is taken up by the textile machine. This is to maintain the yarn tension at a constant predetermined value even during any changes in the conditions under which it is fed to the textile machine.
  • the movable arm of the known solution is constructed with a spring (for example a spiral spring), whose terminal part comprises an eye (for example of ceramic) for passage of the yarn, to allow the arm to perform its compensating function.
  • a spring for example a spiral spring
  • eye for example of ceramic
  • the compensator device of the known system in practice operates as a balance and the force of the spring is adjusted manually or automatically to ensure that its force is able to compensate for the tension in the fed yarn to keep its terminal part at the centre of the angular sector of movement.
  • the force of the spring is also associated with the working tension limits within which the device can work effectively.
  • the spring is calibrated for medium-high tensions for a specific application (e.g. 10 g), its force must be calculated accordingly; when instead the working tension is lower, the chosen force will constitute an operating limit for the device.
  • the known compensator device thus has the great limitation that the spring must be dimensioned according to the desired working tension, making the system inflexible, or that the spring must be differently dimensioned by the operator, or that the entire compensator device must be differently dimensioned as the working tension varies, which of course is not always possible.
  • the terminal part of the compensating arm is part of the spring, it too undergoes bending due to the force of the yarn and this makes reading of its position inaccurate and therefore difficult to use as a predictive signal for anticipating any compensating action by the device to vary the conditions under which the yarn is taken up; it is also difficult to keep the spring in a specific position, as it is flexible.
  • US4752044 relates to a yarn feeder apparatus with electronic tension control.
  • the apparatus comprises a housing on one side of which is located rotating means on which yarn directed towards a textile machine is wound, said yarn having previously acted together with braking means associated with such housing.
  • the yarn passes through a fixed eye and then through an eye located at the end of a movable guide arm forming an integral part of the known yarn feeder apparatus; at the outlet from the eye of this guide arm the yarn acts together with another fixed eye before leaving the apparatus.
  • the yarn guide arm is intended to form a reserve of yarn F on the outlet side of the rotating means and therefore downstream of it when yarn feed slows down due to a change in yarn take-up by the textile machine.
  • the yarn guide arm can be directly attached to a permanent magnet direct current electric motor contained in the housing of the apparatus or it can act together with a lever which is in turn an integral part of the apparatus and is moved by an electric motor within said housing.
  • an electro-optical signal transducer detects the angular position of the guide arm and emits a signal that represents the tension of the fed yarn and at the same time represents the angular position of such arm and therefore the size of the reserve of yarn created downstream of the rotating means.
  • the (direct current) electric motor forms an electromagnetic control transducer that exerts a carefully predetermined and adjustable control force on the guide arm.
  • the force is equal to the tension the yarn exerts on the eye of the guide arm.
  • This force can be adjusted by means of a potentiometer in an electric circuit comprising a power supply unit powering the direct current motor.
  • a compensation signal that is imposed on the control input to the aforesaid power supply is defined, said signal being set (and therefore of constant value) so as to correspond to a specific yarn tension.
  • the power supply unit controls the direct current motor to define an equilibrium position of the guide arm which it is able to maintain when subjected to the force of the yarn.
  • the guide arm takes up the particular equilibrium angular position between two stop pins between which the arm can only move angularly.
  • the force exerted by the yarn passing through the eye attached to the arm is balanced by the force of the direct current motor acting on the lever or on the arm itself.
  • the guide arm moves angularly with respect to the initial equilibrium position so as to generate an electrical signal corresponding to the change in position through the transducer mentioned above.
  • the signal is passed to means controlling the apparatus.
  • This means acts on the feed of an actuator that controls the rotating means so as to act on the yarn feed rate until the guide arm returns to the predetermined equilibrium position in which the yarn tension is compensated for by the control force exerted by the lever acting on the aforesaid arm generated by the electric motor connected to that lever or is in equilibrium with the force generated directly on the movable arm by the motor which acts together with it.
  • the known solution is able to detect a change in the feed conditions for the yarn that is compensated for by corresponding action on the rotating feeder device.
  • the guide arm is directly or indirectly subjected to the action of an electric motor whose function is only to counterbalance the change in tension of the yarn to keep the guide arm in the resting position.
  • the guide arm, and the actuator directly or indirectly acting together with it have a wholly passive function because it is only the action on the actuator of the rotating means that enables this arm to stay in the balance position or return to it after the arm has moved angularly between the fixed pins (attached to the housing of the apparatus).
  • Such a guide arm is always subject to a predetermined force and can only compensate for limited changes in yarn tension because of its limited movement between these fixed pins.
  • WO2005/111287 describes a yarn feeder device comprising a sensor capable of reading the tension of yarn fed to a textile machine and rotating feeding means subject to the control of an electric motor.
  • the movement of this means is controlled by a microprocessor unit which regulates the speed of this means according to the tension of the yarn detected by the tension sensor.
  • This sensor is located at the free end of a rigid arm which can move against a resistant element when the yarn changes its tension at the outlet from the rotating means and passes over an idling roller or pulley associated with the free end of the movable arm.
  • Opposition to the movement of this arm can be achieved by means of a spring or a carriage moving along a rail associated with the feeder device.
  • the rotating means and the movable rigid arm are an integral part of the known feeder device.
  • the yarn is wound at least once onto the rotating means before passing through the pulley at the end of the rigid arm. Movement of the yarn causes the arm to rotate in a direction that follows yarn feed direction and this rotation is counteracted by the opposing elements (spring or carriage), an action regulated by an operator.
  • the tension sensor detects the yarn tension, compares it with a fixed value and then adjusts the speed of the rotating means so as to keep the yarn tension close to the required value. Movement of the rigid arm prevents any excessively rapid increase in yarn tension by moving back, thus preventing the yarn from breaking.
  • WO 2013/064879 in the name of the applicant, describes a method and a system according to the precharacterising parts of the corresponding independent claims of the present document.
  • the aforesaid prior document describes a metal wire feeder device comprising a body with wire-braking means, one or more pulleys controlled by their respective motors on which the wire is wound, a wire which passes through a compensator member and a tension sensor before reaching an operating machine.
  • Control electronics are able to measure the wire tension continuously so as to match it to a predetermined value by acting on a first control loop acting on the motors and a second control loop acting on the compensator member.
  • This compensator member also comprises a compensating arm having a free end acting together with the wire and in turn free to rotate about a pin fixed on a bracket associated with body. This arm can then move within the body of a predetermined angular sector by approaching or moving away from the tension sensor (defined by a load cell).
  • the compensating arm is associated with a spring connected on one side to a support fixed to the body of the device and on the other to the compensating arm by a movable carriage which is moved, through an Archimedes or endless screw, by an electric stepper motor.
  • the compensating arm is not directly connected to the electric motor, but the latter drives and moves this compensating arm through the interposition of other components, each with its own inertia.
  • the compensating arm is associated with a position sensor connected to the control unit which is thus able to measure the position of that arm within a predetermined angular sector.
  • the compensating arm is thus able to oppose slip of the wire not in a static but in a dynamic way: the control unit can in fact vary the position of the carriage (acting on the electric motor) to which the spring is attached, bringing about a change in the force exerted by the latter on the arm and bringing it to the desired position within the predetermined angular sector. In this way the compensating arm keeps the wire always perfectly tensioned on the load cell or tension sensor, especially during the stages when the wire is not fed to the textile machine.
  • the compensating arm also creates a reserve of metal wire from which the machine can draw during unforeseen speed changes.
  • the prior document in question then describes a feeder device equipped, as an integral and inseparable component, with a compensating arm which is free to move within a predetermined angular sector.
  • the control system for the device knows the position of the arm and through an electric motor and a system of (one or more) springs is able to define the force to be applied, according to the measured tension or the read position, thus closing two possible control loops, a second loop relating to the tension (the first is the one relating to the motors connected to the pulleys) and a possible second one for the position of the arm.
  • the force applied to the arm is managed through a system of springs and a movable carriage, driven by an electric stepper motor, which is used to change the fulcrum of the lever and therefore the force that it exerts on the wire.
  • the compensating arm in practice operates as a balance and the force of the spring is adjusted automatically so that its force is able to compensate for the tension of the fed wire to keep its terminal part at the centre of the angular sector of movement.
  • compensating capacity particularly during the slackening stage, is closely linked to the length of the compensating arm and the amplitude of the angular sector; this capacity is therefore limited.
  • the known feeder device inseparably incorporates the compensator member.
  • the result is a heavy assembly of not insignificant dimensions.
  • the object of the present invention is to provide an improved method and system for controlling the feeding of discontinuously fed yarn which comprises a yarn feeder associated with a device compensating for changes in yarn take-up by the textile machine.
  • the object of the present invention is to provide a system of the type mentioned with a compensator device which is to be inserted into a control loop (tension measured with respect to the speed of the feed pulley) when feeding yarn to a textile machine that overcomes the limitations of existing solutions.
  • Another object is to provide a method of the type mentioned above that can actively or dynamically compensate for any change in tension undergone by the yarn during the aforementioned discontinuous feeding to the textile machine, during the stages of both feeding the yarn to the textile machine and removing yarn from the latter during the stages in which such feeding is interrupted.
  • a further object of the invention is to provide a system of the type mentioned above having an independent compensator device that does not vary its dynamic characteristics in relation to the set working tension.
  • Another object is to provide a system of the type mentioned above having a compensator device that allows for precise measurement of the position of the compensating means and can also operate in a predictive manner when the yarn begins to undergo tension changes at the start of a different stage in the discontinuous feed to the textile machine.
  • a further object is to provide a system of the type mentioned above having a compact compensator device that can also be applied as an additional element to a feeder device that enables the system to which it belongs to recover more yarn during the stages of slackening or reversal of the textile machine in comparison with how much can be recovered by known systems.
  • a compensator device is generically indicated by 1 and is associated with an end 2A (or is located on a side) of a feeder device or simply a feeder 2, which is in itself known, to feed a yarn F (shown as a dashed line in Figure 1 ) at constant tension to a textile machine T.
  • Yarn F can also be a metal wire and can be delivered to an operating machine such as a winder.
  • Device 1 is a complete and clearly identifiable element, in terms of both construction and use, in comparison with feeder 2.
  • Feeder 2 has a tension sensor 3, a pulley 4 (or equivalent yarn accumulation means) driven by its own electric motor (not shown) and a control unit or electronics 60, preferably with microprocessor (see Figure 10A-10C ), which is in itself known.
  • This control unit or electronics is able to assess the tension in a yarn detected by sensor 3 as it is fed to the textile machine, compare the detected tension with a predetermined value (or SET POINT value) and check and adjust the tension of the yarn (if it differs from the desired value) through acting on the aforesaid electric motor and therefore on pulley 4.
  • This feeder 2 and its parts 3, 4 are of a type and operation which are known and therefore will not be further described.
  • the feeder allows the yarn to be fed to the textile machine at constant tension, said textile machine being a production unit for manufactured products or a machine for processing the yarn.
  • Device 1 and feeder 2 define a feeding system for yarn F according to the invention.
  • Compensator device 1 is able to act together with the yarn after it has passed over pulley 4. This compensator device is therefore within the yarn tension control loop, as may be seen from Figure 1 and as will be clear from the description of the method according to the invention. Thanks to the present invention it is possible to increase the dynamic performance of the feeder system so that it will be able to compensate instantly for sudden changes in yarn take-up (positive and negative), enabling the pulley motor to change to the new speed to feed the yarn as required by the new take-up situation without causing positive or negative tension peaks in the final yarn tension.
  • compensator device 1 within the control loop always ensures that the tension of the yarn leaving feeder 2 is always the same as the one set.
  • Compensator 1 is an independent device in comparison with feeder 2 and comprises an electric motor 8, for example a direct current brush motor, preferably with very low inertia to increase its dynamics.
  • motor 8 directly moves a drive shaft having two parts projecting from opposite sides of the motor itself.
  • the first part of the drive shaft is indicated by 7 (see Figures 7-9 ), and the second part indicated by 10 may be seen in Figure 9 ; the motor is also inserted within a body 11 of the device.
  • a rigid arm 13 (which is thus attached to the drive shaft itself) is mechanically attached to the first part of the drive shaft.
  • At end 14 of arm 13 there is also an annular body (or one of another shape) of ceramic (or other material) 16 over which the yarn runs.
  • Electric motor 8 is preferably of very low inertia to allow rapid movement of arm 13 under the force of the yarn and therefore rapid compensation for this movement without it causing tension peaks in the yarn itself.
  • Arm 13 can however freely rotate (causing the motor to rotate) about an axis M (or drive shaft axis) if drawn by yarn F, both when the motor has very low inertia (preferred) and when it has limited inertia; in every case this arm has a zero or initial resting position (for example that seen in Figure 6 ) that is adopted when yarn F is taken up by textile machine T without changes in tension and without interruptions.
  • This arm may also adopt other compensation positions, as described below.
  • the assembly of arm 13 and motor 8 (i.e. substantially device 1) can operate in two different modes: passive-dynamic mode or active-predictive mode.
  • the motor In passive-dynamic mode the motor enables arm 13 (attached to the drive shaft) to be pulled by the yarn and moved from its resting position also causing the motor itself to rotate. However, this motor acts after said movement to return arm 13 to the resting position. In this mode or operating mode the motor substantially operates as a "dynamic" spring whose force (with which it acts on arm 13) can be programmed by programming and/or controlling the motor torque.
  • This force is not however predetermined and fixed (as in the solution in US4752044 ), but can vary in that it automatically adjusts to changes in the set value of the yarn tension in the various stages of the production process so as to always maintain the arm in its predetermined position whatever the set operating tension of the yarn for each particular stage in the production of a manufactured article.
  • This enables motor 8 to oppose an equal and opposite force to that which moves arm 13 (to which it is always directly connected) from the resting position to maintain this arm in its equilibrium position (for example that at "3 o'clock" in Figure 6 ).
  • motor 8 In active-predictive mode, motor 8 is able to act in advance (in "predictive" mode) as soon as it detects a change in the yarn tension (detected by sensor 3) due to a change in the operating stage of the machine.
  • motor 8 moves arm 13 carried by the drive shaft to the compensating position capable of compensating for the change in tension: if this tends to increase, motor 8 moves the arm to the compensating position at "6 o'clock" in Figure 7 , if the change tends to a decrease in yarn tension (because the textile machine has stopped or slowed down yarn take-up), the motor moves arm 13 to the compensating position at "12 o'clock” in Figure 8 .
  • This enables the yarn tension to be kept constant regardless of the operating and production stage of textile machine T.
  • Figures 11A-11C show the tension curves in situations where motor-arm assembly or device 1 is disabled ( Figure 11A ), in passive-dynamic mode ( Figure 11B ) or in active-predictive mode ( Figure 11C ).
  • curves or lines F, K, W and Y respectively define the set yarn tension (in a production operating stage, curve F), the measured yarn tension (curve K), the set point position for arm 13 (curve W) and the actual position of arm 13 (curve Y).
  • time is the abscissa
  • the ordinate is the tension measured for F and K, as well as a position value for W and Y.
  • Second part 10 of the drive shaft supports a magnet 18, which, together with arm 13 associated with motor 8, is free to rotate about its axis M within a specific circular sector (causing the drive shaft to rotate).
  • the assembly comprising arm 13 and magnet 18 can rotate freely, making a complete revolution about axis of rotation M (the axis of the drive shaft) ; in other words, both arm 13 and magnet 18 are splined onto the drive shaft with the result that both rotate about axis M in the same way, freely or within an angular sector. This enables the position of arm 13 to be immediately known by detecting the position of the magnet.
  • position detectors 19 around the magnet for example one or more linear Hall sensors 20, capable of generating a position signal addressed, for example, to a control unit 70 of compensator device 1. Thanks to the Hall sensor data this unit 70 is able to transform the motor rotation into two sinusoids offset by 90° (Sine and Cosine) from which it is possible to obtain the absolute position of the shaft and therefore of arm 13 that acts together with the yarn, arm 13 being rigidly attached to the shaft and to magnet 18, in real time.
  • control unit also advantageously comprises systems (in themselves known) to drive the electric motor to control its rotation speed and applied torque.
  • control electronics 60 of feeder 2 and control unit 70 of compensator device 1 so as to be able to set the desired torque for the motor of this device 1 and then control its rotation and read its position (and consequently, in a direct and immediate way, that of arm 13).
  • the torque setting is dynamic and not fixed as it depends on the set yarn tension or that detected by sensor 3.
  • Information exchange may take place in one of the following ways: through any serial bus, through digital or PWM signals, or through analog signals.
  • feeder 2 (through its control electronics), which acts together with said compensator device 1, is able to know the position of arm 13 in real time, in a secure and immediate way, and adjust the torque/shift/speed applied to the motor of compensator device 1. This is because of the direct connection between the drive shaft and said arm or because of the direct action of this motor on the arm.
  • the feeder system for yarn F is therefore able to close a second control loop for the position of arm 13 in an almost immediate way to keep it in the desired position, for example in its central position ("3 o'clock"), as the set tension varies. This is to compensate for movement of the yarn and changes in its tension linked to the various operating stages of the textile machine.
  • the electronics of the feeder system i.e. control unit 70 of compensator device 1 or control electronics 60 of feeder 2, as described above
  • control unit 70 of compensator device 1 or control electronics 60 of feeder 2 are able to hold the position of compensating arm 13 at the desired value.
  • This torque value will therefore allow arm 13 to be kept in equilibrium in its resting position, for example at 3 o'clock, by applying a force equal and contrary to the feed tension of the yarn to the arm, directly through the drive shaft. This is without any delay in the action on arm 13, as instead happens in the solution in WO 2013/064879 .
  • the feeder electronics will therefore be able to control the position of compensating arm 13, automatically and quickly, precisely because the arm is attached to the drive shaft, thus enabling the operator to modify the working tension at will during processing, for example, to make graduations in tension during the production cycle for a manufactured article (for example graduated compression on medical socks, etc.).
  • Each change in tension involves a change in the motor torque applied to arm 13 that will always adopt the resting position (for example "3 o'clock") or will be brought back to it to keep constant the "present" tension of the yarn or the tension that the yarn takes up during the particular feed stage required for that particular production stage.
  • the feeder system is provided with a control unit (device 1 or feeder 2), incorporating for example a microprocessor, which controls operation of the motor that directly moves arm 13.
  • a control unit device 1 or feeder 2
  • this arm together with the drive shaft to which it is connected, can initially move freely about axis M (causing the motor to rotate) when the textile machine's take-up or feed conditions vary with consequent change in the tension of the yarn passing through annular body 16 supported by arm 13.
  • any change in the position of arm 13 (with respect to a predetermined reference or resting position, e.g. "3 o'clock") is detected by the control unit of the feeder system through signals coming from position detection means 19. These data are supplied to said electronic control unit (60, 70) for the feeder system to close the control loop.
  • Control unit 70 of device 1 is able to detect by how much (angularly) arm 13 has moved from the reference position and on the basis of this value control electronics 60 of feeder 2 can monitor, change and control the power supply to the motor of pulley 4 so that it changes its rotation speed to compensate for the angular movement of arm 13 with respect to the reference position.
  • feeder 2 makes use of information on the position of arm 13 to anticipate the change (acceleration/deceleration of pulley 4), further improving the quality of the delivery tension. This is in accordance with the "active-predictive" operating mode described above.
  • compensator device 1 therefore acts as a "balance" and the electronics of the feeder system will in real time calculate the torque to be applied to motor 8 that acts together with arm 13 to keep it always in balance in a wholly automatic way. This depends on the "present" tension of yarn F (obviously to maintain the predetermined tension).
  • arm 13 will tend to rise (moving towards the "12 o'clock" position in Figure 8 ) decreasing the quantity of yarn F sent to machine T, until the motor of pulley 4 reaches the necessary rotation speed to eliminate or reduce slackening of the yarn. At this point the arm will return to its initial or resting position automatically ( Figure 6 ).
  • the resting position of arm 13 lies within a range of movement of compensating means or arm 13 which has two limiting positions (that is 6 o'clock and 12 o'clock).
  • the electronics of feeder 2 can use this information to accelerate or slow the rotation of pulley 4 to minimize the time for settling into the new ideal speed to obtain a constant preset value of the tension of yarn F and maintain it, further limiting the amplitude of the tension peak or slackening in yarn F.
  • the feeder system can change the drive of motor 8 that acts together with arm 13 to reduce the change in the delivery tension of feeder 2 even more; for example:
  • the set point or reference value for the position control loop for compensating arm 13, hitherto considered for example to be the "3 o'clock" value ( Figure 6 ), may instead be variable and suitably dynamically managed by the feeder electronics in order (for example) to provide for a possible subsequent feeding stage; for example, during the stage in which the yarn is slowed down and then stopped by the textile machine the set point could automatically pass to the 12 o'clock position so that there is a greater stock of yarn F to provide for the next acceleration on restarting, further reducing the next peak.
  • a drum or cylinder 26 on which yarn is deposited during the recovery stage, thus increasing the quantity of yarn F stored, because the amplitude of the angular rotation sector has increased, and in this case will no longer be restricted to between 6 o'clock and 12 o'clock but will be able to rotate freely about axis of rotation M.
  • the drum where the yarn is deposited may be attached to arm 13 or free to rotate on bearings that make its rotation independent.
  • the diameter of the drum determines the maximum quantity of yarn F that can be recovered from the device 1 / feeder 2 system. This drum may therefore have different dimensions depending on the quantity of yarn F that is desired to be recovered on it.
  • This drum may be cylindrical, semicylindrical or have a shape with a variable cross-section.
  • the compensator device may work without mechanical stops preventing it from rotating beyond the 6 o'clock to 12 o'clock arc, allowing arm 13 to rotate without restriction about the axis during the recovery stage. In this case arm 13 is free to deposit a much larger quantity of yarn stored during the recovery stage on drum 26, which will then be fed back to the textile machine at the next restart.
  • a single "system” is able to work at even very different feed tensions, without the need for any action by the operator.
  • This system is able to compensate for sudden changes in feed without giving rise to tension peaks or slackening of the yarn, as well as, to a small extent, to recover greater quantities of yarn F than in the solutions previously described in the state of the art.
  • annular ceramic body on arm 13 may be replaced by a body made of any other material having slip characteristics appropriate to the application.
  • the text describes the use of a direct current motor with brushes, but it is obvious that any type of electric motor or actuator (brushless, stepper, etc.) and also pneumatic could be used.
  • arm 13 is rigid, although it may have its own minimal flexibility, so as to further cushion the compensating effect, such flexibility deriving from the material or cross-section with which the arm is made.
  • this compensating arm is described as rotating, but it may be replaced by an arm that follows a linear motion using a linear actuator or motor moving longitudinally through positions equivalent to 6, 3 and 12 o'clock.
  • control unit for device 1 acting together with the control electronics for feeder 2 has been described.
  • this control unit may be the one for feeder 2 (that is it may be part of its control electronics) and act automatically when body 11 of device 1 is attached to feeder 2, automatically recognising the presence of device 1 (the presence of body 11 being detected by suitable connectors, not shown, through which the control unit acts together with the motor of device 1 and the encoder or position sensor means for the drive shaft associated with arm 13).
  • This solution is shown in Figure 10C .
  • the invention applies to the feeding of textile yarns, but also metal wires.

Landscapes

  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Tension Adjustment In Filamentary Materials (AREA)
  • Preliminary Treatment Of Fibers (AREA)
  • Yarns And Mechanical Finishing Of Yarns Or Ropes (AREA)
  • Filamentary Materials, Packages, And Safety Devices Therefor (AREA)

Claims (14)

  1. Procédé d'alimentation en fils, y compris en fils métalliques, d'une machine textile (T) à tension constante, ou d'une machine traitant le fil métallique, ladite alimentation s'effectuant de manière discontinue, c'est-à-dire avec des séquences d'étapes dans lesquelles le fil (F) se déplace avec au moins une première et au moins une deuxième condition d'alimentation ou de reprise par la machine qui diffèrent l'une de l'autre, lesdites conditions se succédant dans le temps, ladite alimentation étant effectuée par un dispositif d'alimentation en fil (2) comportant des moyens de détection de la tension (3), des moyens accumulateurs de fil (4) entraînés par leur propre moteur électrique et des moyens de commande (60) reliés à ces moyens de détection de la tension (3) et à ces moyens accumulateurs (4) et capables d'agir sur ces moyens accumulateurs (4) sur la base d'une valeur de tension obtenue à partir desdits moyens de détection de la tension (3), avec prévision de ce qu'un dispositif compensateur (1) associé audit dispositif d'alimentation (2) agisse avec le fil (F) provenant desdits moyens accumulateurs (4) avant d'agir avec lesdits moyens de détection de la tension (3), ledit dispositif compensateur (1) étant capable de compenser les changements dans les conditions d'alimentation ou de reprise du fil (F) lors de la transition entre chaque première et chaque deuxième condition d'alimentation ou de reprise faisant suite à la première, ceci permettant aux moyens de commande (60) du dispositif d'alimentation d'agir sur les moyens accumulateurs (4) pour modifier leur action sur le fil et de maintenir la valeur de la tension détectée par les moyens de détection de la tension (3) constante dans le temps et égale à une valeur de consigne, ladite tension constante étant également maintenue pendant la phase de changement des conditions d'alimentation grâce à l'interaction entre ledit fil et ledit dispositif compensateur (1), le dispositif compensateur (1) comprenant un moyen de compensation mobile (13) supportant un corps (16) capable d'agir avec le fil (F) à une extrémité libre, ledit moyen de compensation mobile pouvant se déplacer à partir d'une position de repos prédéterminée dans la direction d'alimentation du fil (F) lorsque le fil passe d'une condition de moindre reprise à une condition de plus grande reprise, mais se déplace dans la direction opposée lorsque le fil (F) passe d'une condition de plus grande reprise à une condition de moindre reprise, ledit moyen de compensation (13) revenant à la position de repos à la fin de ce changement de reprise, caractérisé en ce qu'il est prévu de commander le mouvement dudit moyen de compensation (13) par l'intermédiaire de son propre moteur électrique correspondant (8) directement et rigidement attaché audit moyen de compensation (13) et capable de commander directement le mouvement dudit moyen de compensation (13), ledit moyen de compensation (13) étant un bras rigide, le moyen de compensation (13) étant commandé en fonction de la tension réglée ou détectée du fil (F) et de la position mesurée au cours de chaque phase d'alimentation de la machine textile.
  2. Procédé selon la revendication 1, caractérisé en ce que le moyen de compensation (13) et son moteur électrique (8) qui le commande directement et strictement en mouvement fonctionnent selon un mode passif-dynamique, ledit moyen de compensation (13) pouvant se déplacer librement, avec le moteur, sous la force du fil (F) mais pouvant être ramenés en position de repos après ce mouvement par le moteur électrique (8), ledit moteur (8) générant un couple capable de maintenir ledit moyen compensateur du fil (F) en position de repos au fur et à mesure que la machine textile est alimentée en fil.
  3. Procédé selon la revendication 1, caractérisé en ce que le moyen de compensation (13) et le moteur électrique relatif (8) qui le commande en mouvement fonctionnent en mode actif-prédictif, ledit moteur (8) déplaçant le moyen de compensation (13) de la position de repos à une position de compensation correspondant à la variation de la tension du fil (F) dès qu'une telle variation est détectée.
  4. Procédé selon la revendication 1, caractérisé en ce qu'il prévoit une commande continue du moteur électrique (8) du dispositif compensateur par une unité de commande (60, 70) reliée directement ou indirectement aux moyens de détection de la tension (3).
  5. Procédé selon la revendication 1, caractérisé en ce qu'il est alternativement prévu que ledit moyen de compensation (13) tourne autour d'un axe fixe (M) d'un arbre d'entraînement sortant du moteur électrique auquel lesdits moyens de compensation sont rigidement attachés, ou se déplacent le long du dispositif compensateur (1).
  6. Procédé selon la revendication 1, caractérisé en ce qu'il est prévu une accumulation supplémentaire de fil (F) sur le dispositif compensateur (1) en plus de l'accumulation de fil sur le moyen accumulateur (4) du dispositif d'alimentation (2).
  7. Procédé selon les revendications 1 et 5, caractérisé en ce que le mouvement du moyen de compensation (13) soit angulairement limité, soit illimité.
  8. Système d'alimentation en fils, y compris en fils métalliques, à tension constante d'une machine textile (T) ou d'une machine de traitement de fils métalliques, ladite alimentation étant réalisée de façon discontinue ou avec des séquences d'étapes dans lesquelles le fil (F) se déplace avec au moins une première et au moins une deuxième condition d'alimentation ou de reprise par la machine qui diffèrent l'une de l'autre, lesdites conditions se succédant dans le temps, ledit système d'alimentation fonctionnant suivant le procédé selon la revendication 1 et comprenant un dispositif d'alimentation (2) en fil comportant des moyens de détection de la tension (3), un moyen accumulateur de fil (4) entraîné par son propre moteur électrique et un moyen de commande (60) relié à ces moyens de détection de la tension (3) et à ce moyen accumulateur (4) et capable d'agir sur ledit moyen accumulateur (4) sur la base d'une tension obtenue à partir de ces moyen de détection de la tension (3), avec prévision de ce qu'un dispositif compensateur (1) associé audit dispositif d'alimentation (2) agisse avec le fil (F) sortant dudit moyen accumulateur (4) avant qu'il n'agisse avec lesdits moyens de détection de la tension (3), ledit dispositif compensateur étant capable de compenser les changements dans les conditions d'alimentation ou de reprise du fil (F) lors de la transition entre chaque première et chaque deuxième condition d'alimentation ou de reprise consécutive à la première, ceci permettant aux moyens de commande (60) du dispositif d'alimentation d'agir sur les moyens accumulateurs (4) pour modifier leur action sur le fil et maintenir la valeur de la tension détectée par les moyens de détection de la tension (3) constante dans le temps et égale à une valeur de consigne, ladite tension constante étant maintenue même pendant les phases de changement des conditions d'alimentation grâce à l'interaction entre ledit fil et ledit dispositif compensateur (1), le dispositif compensateur (1) comporte un moyen de compensation mobile (13) capable de se déplacer à partir d'une position de repos prédéterminée dans la direction d'alimentation du fil (F) lorsque le fil passe d'une condition de moindre reprise par la machine à une condition de plus grande reprise, mais se déplaçant en sens inverse lorsque le fil (F) passe d'une condition de grande reprise à une condition de moindre reprise, ledit moyen de compensation (13) revenant à la position de repos à la fin de ce changement de reprise, caractérisé en ce que ledit moyen de compensation (13) est un bras rigide portant un corps terminal (16) capable d'agir de concert avec le fil (F), ledit bras rigide (13) étant directement et rigidement relié à son propre moteur électrique (8) qui le commande directement en mouvement en fonction de la tension réglée ou détectée dans le fil (F), ledit bras rigide étant situé entre lesdits moyens accumulateurs de fil (4) et lesdits moyens de détection de la tension (3), mais étant séparé de ces derniers.
  9. Système selon la revendication 8, caractérisé en ce que, alternativement, la position de repos du moyen de compensation (13) se situe dans une plage de mouvement de ces moyens de compensation ayant deux positions limites ou est définie dans une trajectoire circulaire de ces moyens autour d'un axe (M), ladite trajectoire n'étant pas limitée angulairement.
  10. Système selon la revendication 8, caractérisé en ce que des moyens de détection de position (19) sont prévus pour déterminer la position spatiale du bras rigide (13), lesdits moyens de détection de position (19) étant associés à l'arbre d'entraînement dudit moteur électrique portant également de manière rigide ledit bras rigide.
  11. Système selon la revendication 10, caractérisé en ce qu'il est prévu une unité de commande (60, 70) du moteur électrique (8) du dispositif compensateur (1) reliée au moyen détecteur de position (19) et capable de détecter le mouvement du moyen de compensation (13) depuis la position de repos prédéterminée par l'intermédiaire dudit moyen détecteur de position (19) et de ramener ledit moyen de compensation (13) dans la position de repos prédéterminée par la commande du moteur électrique auquel le moyen de compensation (13) est rigidement et directement attaché, ladite unité de commande (60, 70) étant directement ou indirectement reliée aux moyens de détection de la tension du fil (3), ladite unité de commande contrôlant le moteur électrique sur la base de la tension du fil (F) détectée pendant que ledit fil (F) est introduit dans la machine.
  12. Système selon la revendication 11, caractérisé en ce que ladite unité de commande (60, 70) est alternativement associée au dispositif compensateur (1) et connectée aux moyens de commande du dispositif d'alimentation (2) ou que ladite unité de commande fait partie des moyens de commande du dispositif d'alimentation (2).
  13. Système selon la revendication 8, caractérisé en ce que ledit dispositif compensateur (1) est un composant indépendant du dispositif d'alimentation (2), ledit dispositif compensateur (1) étant fixé de manière amovible au dispositif d'alimentation (2) et étant situé à une extrémité (2A) ou sur un côté dudit dispositif d'alimentation, ledit dispositif compensateur (1) étant entièrement automatique par rapport audit dispositif d'alimentation (2) mais étant intimement lié audit dispositif d'alimentation lorsqu'il y est connecté.
  14. Système selon la revendication 8, caractérisé en ce que le dispositif compensateur (1) comporte un moyen (26) tournant autour de son propre axe et capable de recevoir, lorsqu'il est enroulé, le fil (F) dans au moins l'une des conditions d'alimentation ou de reprise de la machine.
EP19703785.6A 2018-02-06 2019-02-04 Procédé et système d'alimentation en fil d'optimisation de l'alimentation en fil d'une machine textile fonctionnant de manière très discontinue ou à mouvement alternatif Active EP3749603B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT201800002452A IT201800002452A1 (it) 2018-02-06 2018-02-06 Metodo, sistema alimentatore di filo perfezionato e dispositivo per ottimizzare l'alimentazione di filo ad una macchina tessile operante con elevata discontinuita' o con un moto alternato
PCT/IB2019/050874 WO2019155346A1 (fr) 2018-02-06 2019-02-04 Procédé et système d'alimentation en fil amélioré et dispositif d'optimisation de l'alimentation en fil d'une machine textile fonctionnant de manière très discontinue ou à mouvement alternatif

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EP3749603B1 true EP3749603B1 (fr) 2024-05-22

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EP (1) EP3749603B1 (fr)
JP (1) JP7181947B2 (fr)
CN (1) CN111699144B (fr)
IT (1) IT201800002452A1 (fr)
TW (1) TWI780300B (fr)
WO (1) WO2019155346A1 (fr)

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EP3715294A1 (fr) * 2019-03-29 2020-09-30 Maschinenfabrik Rieter Ag Procédé de commande d'un poste de travail d'une machine textile, dispositif pour la mise en ouvre du procédé
ES2970444T3 (es) * 2019-11-12 2024-05-28 Karl Mayer Rotal Srl Disposición de anudado de cuerdas

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JPS5516888A (en) * 1978-04-06 1980-02-05 Du Pont Canada Method of and apparatus for winding bulked yarn
DE3627731C1 (de) * 1986-08-16 1988-03-31 Gustav Memminger Fadenliefervorrichtung mit elektronischer Fadenspannungsregelung
DE19811241A1 (de) * 1998-03-14 1999-09-30 Memminger Iro Gmbh Fadenspannungssensor mit wiederholtem Abgleich
ITMI20020770A1 (it) * 2002-04-10 2003-10-10 Tiziano Barea Dispositivo e metodo per alimentare un filo elastomerico ad una macchina tessile al fine di avere un manufatto di qualita' costante in ogni
ITMI20020945A1 (it) * 2002-05-03 2003-11-03 Tiziano Barea Metodo e dispositivo per l'alimentazione ed il recupero a tensione costante di un filato alimentato ad una macchina tessile
DE102004051520B4 (de) * 2004-10-21 2014-12-31 Memminger-Iro Gmbh Fadenliefergerät mit Rückholbetrieb und Verfahren zum Betrieb eines Fadenliefergerätes
ITMI20080410A1 (it) * 2008-03-11 2009-09-12 Btsr Int Spa Dispositivo e metodo per l'alimentazione a tensione costante di filati alimentati in modo discontinuo
EP2204481B1 (fr) * 2008-12-30 2013-07-10 L.G.L. Electronics S.p.A. Fournisseur de fil positif avec limiteur de tension
ITMI20100887A1 (it) * 2010-05-18 2011-11-19 Btsr Int Spa Metodo e dispositivo perfezionato per alimentare un filo ad una macchina operatrice con tensione e velocita' costante
ITMI20111983A1 (it) * 2011-11-02 2013-05-03 Btsr Int Spa Dispositivo alimentatore positivo per alimentare a tensione costante fili metallici
ITMI20112091A1 (it) * 2011-11-17 2013-05-18 Btsr Int Spa Alimentatore di filo, del tipo ad accumulo e con freno magnetico
ITMI20122185A1 (it) * 2012-12-20 2014-06-21 Btsr Int Spa Metodo e dispositivo per alimentare a tensione ed a quantita' costante un filo metallico ad una macchina operatrice
ITMI20130948A1 (it) * 2013-06-10 2014-12-11 Btsr Int Spa Dispositivo di recupero di filati e sistema di alimentazione di filati comprendente detto dispositivo
ITTO20130875A1 (it) * 2013-10-29 2015-04-30 Lgl Electronics Spa Alimentatore di filato positivo con controllo della tensione di alimentazione.

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CN111699144B (zh) 2022-07-22
EP3749603A1 (fr) 2020-12-16
JP7181947B2 (ja) 2022-12-01
WO2019155346A1 (fr) 2019-08-15
JP2021512834A (ja) 2021-05-20
US20210070582A1 (en) 2021-03-11
IT201800002452A1 (it) 2019-08-06
TWI780300B (zh) 2022-10-11
CN111699144A (zh) 2020-09-22

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