EP3868695B1 - Textile machine and yarn tension detection - Google Patents

Textile machine and yarn tension detection Download PDF

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Publication number
EP3868695B1
EP3868695B1 EP21153427.6A EP21153427A EP3868695B1 EP 3868695 B1 EP3868695 B1 EP 3868695B1 EP 21153427 A EP21153427 A EP 21153427A EP 3868695 B1 EP3868695 B1 EP 3868695B1
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EP
European Patent Office
Prior art keywords
tension
yarn
roller
current
rotational torque
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.)
Active
Application number
EP21153427.6A
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German (de)
English (en)
French (fr)
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EP3868695A1 (en
Inventor
Kinzo Hashimoto
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TMT Machinery Inc
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TMT Machinery Inc
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Publication date
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Publication of EP3868695A1 publication Critical patent/EP3868695A1/en
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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
    • B65H59/40—Applications of tension indicators
    • D—TEXTILES; PAPER
    • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
    • D01H—SPINNING OR TWISTING
    • D01H13/00—Other common constructional features, details or accessories
    • D01H13/14—Warning or safety devices, e.g. automatic fault detectors, stop motions ; Monitoring the entanglement of slivers in drafting arrangements
    • D01H13/16—Warning or safety devices, e.g. automatic fault detectors, stop motions ; Monitoring the entanglement of slivers in drafting arrangements responsive to reduction in material tension, failure of supply, or breakage, 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
    • B65H63/00—Warning or safety devices, e.g. automatic fault detectors, stop-motions ; Quality control of the package
    • B65H63/02—Warning or safety devices, e.g. automatic fault detectors, stop-motions ; Quality control of the package responsive to reduction in material tension, failure of supply, or breakage, of material
    • B65H63/024—Warning or safety devices, e.g. automatic fault detectors, stop-motions ; Quality control of the package responsive to reduction in material tension, failure of supply, or breakage, of material responsive to breakage of materials
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H63/00—Warning or safety devices, e.g. automatic fault detectors, stop-motions ; Quality control of the package
    • B65H63/04—Warning or safety devices, e.g. automatic fault detectors, stop-motions ; Quality control of the package responsive to excessive tension or irregular operation of apparatus
    • D—TEXTILES; PAPER
    • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
    • D01D—MECHANICAL METHODS OR APPARATUS IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS
    • D01D11/00—Other features of manufacture
    • D—TEXTILES; PAPER
    • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
    • D01D—MECHANICAL METHODS OR APPARATUS IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS
    • D01D5/00—Formation of filaments, threads, or the like
    • D01D5/12—Stretch-spinning methods
    • D01D5/16—Stretch-spinning methods using rollers, or like mechanical devices, e.g. snubbing pins
    • D—TEXTILES; PAPER
    • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
    • D01H—SPINNING OR TWISTING
    • D01H13/00—Other common constructional features, details or accessories
    • D01H13/14—Warning or safety devices, e.g. automatic fault detectors, stop motions ; Monitoring the entanglement of slivers in drafting arrangements
    • D01H13/20—Warning or safety devices, e.g. automatic fault detectors, stop motions ; Monitoring the entanglement of slivers in drafting arrangements responsive to excessive tension or irregular operation of apparatus
    • D—TEXTILES; PAPER
    • D02—YARNS; MECHANICAL FINISHING OF YARNS OR ROPES; WARPING OR BEAMING
    • D02J—FINISHING OR DRESSING OF FILAMENTS, YARNS, THREADS, CORDS, ROPES OR THE LIKE
    • D02J1/00—Modifying the structure or properties resulting from a particular structure; Modifying, retaining, or restoring the physical form or cross-sectional shape, e.g. by use of dies or squeeze rollers
    • D02J1/22—Stretching or tensioning, shrinking or relaxing, e.g. by use of overfeed and underfeed apparatus, or preventing stretch
    • D02J1/227—Control of the stretching tension; Localisation of the stretching neck; Draw-pins
    • 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
    • B65H2701/313—Synthetic polymer threads
    • B65H2701/3132—Synthetic polymer threads extruded from spinnerets

Definitions

  • the present invention relates to a method for detecting the tension of yarns running in a textile machine.
  • Japanese Laid-Open Patent Publication No. 2016-40429 discloses a spun yarn drawing apparatus.
  • the spun yarn drawing apparatus of JP 2016-40429 includes first heating rollers on which yarns spun out from a spinning apparatus are wound and second heating rollers on which the yarns sent from the first heating rollers are wound. Surface temperatures of the second heating rollers are higher than surface temperatures of the first heating rollers.
  • the yarn feeding speeds of the second heating rollers are arranged to be higher than the yarn feeding speeds of the first heating rollers, and the yarns are drawn on account of this speed difference.
  • the spun yarn drawing apparatus of JP 2016-40429 it is necessary to detect and suitably manage the tension of the running yarns, in order to suitably draw the yarns while maintaining the quality of the yarns.
  • an operator measures the tension of yarns by using a tensiometer.
  • the tension of yarns must be managed in the textile machine.
  • the tension of yarns must be managed at each of the intervals of the rollers. It is therefore quite troublesome for the operator to measure the tension of the yarns at each management point. Furthermore, because the measurement is manually done by the operator, the measurement cannot be always done.
  • Japanese Laid-Open Patent Publication No. 2019-157313 discloses an arrangement in which a tension sensor configured to measure the tension of yarns is provided in a yarn path in a draw texturing machine which is a textile machine.
  • Such a tension sensor is typically of a contact type, and the quality of the yarns may be deteriorated due to the friction between the running yarns and the tension sensor.
  • An object of the present invention is to always detect the tension of yarns with ease in a textile machine, without deteriorating the quality of the yarns.
  • a textile machine includes: a roller which is capable of winding a running yarn onto a circumferential surface of the roller; a rotational driving unit which is configured to generate a rotational torque in the roller; a torque information acquisition unit which is configured to acquire a value corresponding to the rotational torque; and a control unit, the control unit being configured to execute: a first rotational torque information acquisition process of arranging rotation speed of the roller to be constant at a predetermined speed, and acquiring, by the torque information acquisition unit, a first predetermined value corresponding to a first rotational torque generated in the roller when no yarn is wound on the roller; a second rotational torque information acquisition process of arranging the rotation speed of the roller to be constant at the predetermined speed, and acquiring, by the torque information acquisition unit, a second predetermined value corresponding to a second rotational torque generated in the roller when the yarn is wound on the roller; and a yarn tension calculation process of calculating a tension-related value related to the tension of the yarn wound onto the roller
  • the tension-related value of the yarn can be calculated based on predetermined values which correspond to a rotational torque in a case where the yarn is wound onto the roller and a rotational torque in a case where the yarn is not wound onto the roller. It is therefore unnecessary to provide a tension sensor to detect the tension of the yarn. In this way, it is possible in the textile machine to always detect the tension of the yarn with ease, without deteriorating the quality of the yarn.
  • the textile machine of the first aspect is arranged such that the tension-related value is a tension difference between the tension of the yarn on the upstream of the roller in a yarn running direction in which the yarn runs and the tension of the yarn on the downstream of the roller in the yarn running direction.
  • a tension difference between the tension of the yarn on the upstream of the roller in the yarn running direction and the tension of the yarn on the downstream of the roller in the yarn running direction is determined in advance based on the characteristics (e.g., the rotation speed and the magnitude of the rotational torque) of the roller and the type of the yarn to be wound. According to the aspect of the invention, it is possible to easily determine whether the tension of the yarn is appropriate, by comparing a tension difference calculated in the yarn tension calculation process with a tension difference determined in advance.
  • the rotational driving unit includes an output unit configured to output a current and a motor configured to generate a rotational torque corresponding to the current output from the output unit, and the control unit acquires a first current as the first predetermined value in the first rotational torque information acquisition process, acquires a second current as the second predetermined value in the second rotational torque information acquisition process, and calculates the tension-related value based on the first current and the second current in the yarn tension calculation process.
  • the tension-related value of the yarn is easily detected as compared to a case where the tension-related value is directly detected.
  • the torque information acquisition unit includes a rotational angle detection unit configured to detect a rotational angle of a rotor of the motor and a torque current calculation unit configured to calculate a current corresponding to the rotational torque based on the rotational angle.
  • the textile machine of the first or second aspect is arranged such that the control unit further executes: a first failure determination process of determining whether the first predetermined value acquired in the first rotational torque information acquisition process is out of a first predetermined range; and a first notification process of notifying that there is a failure in the textile machine, when it is determined in the first failure determination process that the first predetermined value is out of the predetermined range.
  • the first predetermined value is a value corresponding to the rotational torque of the roller when no yarn is wound onto the roller.
  • the textile machine of any one of the first to third aspects is arranged such that the control unit further executes: a second failure determination process of determining whether the tension-related value calculated in the yarn tension calculation process is out of a second predetermined range; and a second notification process of notifying that there is a failure in the tension of the yarn wound onto the roller, when it is determined in the second failure determination process that the tension-related value is out of the second predetermined range.
  • the operator is able to reliably know whether the tension of the yarn wound onto the roller is normal or not.
  • the textile machine of any one of the first to fourth aspects is arranged such that the control unit further executes: a second failure determination process of determining whether the tension-related value calculated in the yarn tension calculation process is out of a second predetermined range; and an adjustment process of adjusting the rotational torque generated in the roller by the rotational driving unit, when it is determined in the second failure determination process that the tension-related value is out of the second predetermined range.
  • the tension of the yarn wound on the roller is maintained to be always appropriate, and hence the quality of the yarn is maintained to be constant in the textile machine.
  • the textile machine of any one of the first to fifth aspects is arranged such that the control unit further executes: a third failure determination process of determining whether the tension-related value calculated in the yarn tension calculation process is out of a third predetermined range; and a third notification process of notifying that the yarn is broken, when it is determined in the third failure determination process that the tension-related value is out of the third predetermined range.
  • the operator is able to reliably and promptly know that the yarn is broken.
  • the textile machine of any one of the first to sixth aspects is arranged such that, conversion information is set in advance to convert the first predetermined value and the second predetermined value into the tension-related value, and the control unit calculates the tension-related value based on the conversion information in the yarn tension calculation process.
  • the tension-related value is calculated based on the conversion information set in advance, a complicated calculation process is unnecessary, and the tension of the yarn can be further easily detected.
  • An eighth aspect of the invention relates to a yarn tension detection method for detecting the tension of a running yarn which runs in a textile machine and is wound onto a roller capable of winding the yarn onto a circumferential surface of the roller, the textile machine comprising: a rotational driving unit generating a rotational torque in the roller; and a torque information acquisition unit acquiring a value corresponding to the rotational torque, the textile machine further comprising a control unit executing the following method steps: a first rotational torque information acquisition step of arranging rotation speed of the roller to be constant at a predetermined speed, and acquiring, by the torque information acquisition unit, a first predetermined value corresponding to a first rotational torque generated in the roller when no yarn is wound on the roller; a second rotational torque information acquisition step of arranging the rotation speed of the roller to be constant at the predetermined speed, and acquiring, by the torque information acquisition unit, a second predetermined value corresponding to a second rotational torque generated in the roller when the yarn is wound on the roller; and a yarn tension calculation
  • the rotational driving unit includes an output unit configured to output a current and a motor configured to generate a rotational torque corresponding to the current output from the output unit, a first current is acquired as the first predetermined value in the first rotational torque information acquisition step, a second current is acquired as the second predetermined value in the second rotational torque information acquisition step, the tension-related value is calculated based on the first current and the second current in the yarn tension calculation step, and the torque information acquisition unit includes a rotational angle detection unit (50) configured to detect a rotational angle of a rotor of the motor (30) and a torque current calculation unit configured to calculate a current corresponding to the rotational torque based on the rotational angle.
  • a rotational angle detection unit 50
  • a torque current calculation unit configured to calculate a current corresponding to the rotational torque based on the rotational angle.
  • the tension-related value of the yarn can be calculated based on predetermined values which correspond to a rotational torque in a case where the yarn is wound onto the roller and a rotational torque in a case where the yarn is not wound onto the roller. It is therefore unnecessary to provide a tension sensor to detect the tension of the yarn. In this way, it is possible in the textile machine to always detect the tension of the yarn with ease, without deteriorating the quality of the yarn.
  • FIG. 1 is a schematic representation of a spun yarn take-up machine 1 including a spun yarn drawing apparatus 3 of the present embodiment.
  • FIG. 2 is an enlarged view of the spun yarn drawing apparatus 3 shown in FIG. 1 .
  • the up-down direction on the plane of FIG. 1 is an up-down direction
  • the left-right direction of the plane is a left-right direction.
  • the direction perpendicular to the plane of FIG. 1 is a front-rear direction
  • the front side of the plane is a front side.
  • the spun yarn take-up machine 1 is configured to draw, by a spun yarn drawing apparatus 3, plural (six in this embodiment) yarns Y serially spun out from a spinning apparatus 2 and made of a solidified molten fibrous material such as polyester, and then to wind the yarns Y by a yarn winding apparatus 4.
  • the spinning apparatus 2 is configured to generate the yarns Y by continuously spinning out a molten fibrous material such as polyester. To the yarns Y spun out from the spinning apparatus 2, oil is applied at an oil guide 10. The yarns Y are then sent to the spun yarn drawing apparatus 3 via a guide roller 11.
  • the spun yarn drawing apparatus 3 is an apparatus for heating and drawing the yarns Y and is provided below the spinning apparatus 2.
  • the spun yarn drawing apparatus 3 includes plural (five in this embodiment) godet rollers 20 (20a to 20e) housed in a thermal insulation box 12. When these rollers are simply termed the godet rollers 20, the five godet rollers 20a to 20e are not distinguished from one another. As shown in FIG. 2 , each of the godet rollers 20a to 20e is rotationally driven by a later-described motor 30 at a predetermined yarn feeding speed. (The rotational direction of each of the godet rollers 20a to 20e is indicated by the corresponding arrow in FIG.
  • the godet rollers 20a to 20e are induction heating rollers which are induction-heated by power supply to a coil. Yarns Y are wound onto these godet rollers.
  • an inlet 12a is formed to introduce yarns Y into the thermal insulation box 12.
  • an outlet 12b is formed to take yarns Y out from the thermal insulation box 12.
  • the yarns Y are wound onto each of the godet rollers 20a to 20e at a winding angle of less than 360 degrees.
  • the yarns Y are wound onto the godet rollers 20a to 20e in order, from the lowest godet roller 20a.
  • the lower three godet rollers 20a to 20c are preheating rollers for preliminarily heating the yarns Y before drawing them.
  • the roller surface temperature of each of these rollers is arranged to be equal to or higher than the glass transition temperature of the yarns Y (e.g., set at about 90 to 100 degrees centigrade).
  • the upper two godet rollers 20d and 20e are conditioning rollers for thermally setting the drawn yarns Y.
  • the roller surface temperature of each of these rollers is arranged to be higher than the roller surface temperatures of the lower three godet rollers 20a to 20c (e.g., set at about 150 to 200 degrees centigrade).
  • the yarn feeding speeds of the upper two godet rollers 20d and 20e are higher than those of the lower three godet rollers 20a to 20c.
  • the yarns Y introduced into the thermal insulation box 12 through the inlet 12a are, to begin with, preliminarily heated to a drawable temperature while being transferred by the godet rollers 20a to 20c.
  • the preliminarily-heated yarns Y are drawn on account of a difference in yarn feeding speed between the godet roller 20c and the godet roller 20d. Subsequently, the yarns Y are further heated while being transferred by the godet rollers 20d and 20e, with the result that the drawn state is thermally set.
  • the yarns Y having been drawn in this way go out from the thermal insulation box 12 through the outlet 12b.
  • the yarns Y drawn by the spun yarn drawing apparatus 3 are sent to the yarn winding apparatus 4 via the guide roller 13.
  • the yarn winding apparatus 4 is an apparatus for winding the yarns Y, and is provided below the spun yarn drawing apparatus 3.
  • the yarn winding apparatus 4 includes members such as a bobbin holder 14 and a contact roller 15.
  • the bobbin holder 14 is cylindrical in shape, and extends in the front-rear direction.
  • the bobbin holder 14 is rotationally driven by an unillustrated motor.
  • bobbins B are attached along the axial direction to be side by side. By rotating the bobbin holder 14, the yarn winding apparatus 4 simultaneously winds the yarns Y onto the bobbins B, so as to produce packages P.
  • the contact roller 15 makes contact with the surfaces of the packages P to adjust the shape of each package P by applying a predetermined contact pressure to each package P.
  • the tension sensor is typically of a contact type, and the quality of the yarns may be deteriorated due to the friction between the running yarns and the tension sensor.
  • the spun yarn drawing apparatus 3 of the present embodiment therefore includes a motor 30 configured to rotationally drive a godet roller 20 so as to generate a rotational torque in the godet roller 20, a motor controller 40 configured to control the motor 30, and a rotational angle detection circuit 50 (rotational angle detection unit of the present invention) configured to detect the rotational angle of the rotor of each motor 30.
  • the motor 30, the motor controller 40, and the rotational angle detection circuit 50 are provided for each of the godet rollers 20a to 20e. An explanation will be given with reference to FIG. 3 .
  • the motor 30 is a permanent magnet synchronous motor which employs a permanent magnet in a rotor.
  • the motor 30 is connected to the godet roller 20 and the motor controller 40, and is able to generate a rotational torque in the godet roller 20 in accordance with a current output from the motor controller 40.
  • the motor controller 40 includes an inverter 41 (output unit of the present invention) and a control unit 60.
  • the inverter 41 is an AC inverter which is configured to convert a direct current supplied from an unillustrated power source into a sine wave alternating current.
  • the control unit 60 is configured to control the magnitude and frequency of the alternating current output from the inverter 41.
  • the rotational torque generated in the godet roller 20 is determined by the magnitude of the alternating current output from the inverter 41, whereas the rotation speed (i.e., yarn feeding speed) of the godet roller 20 rotationally driven by the motor 30 is determined by the frequency of the alternating current.
  • the rotational angle detection circuit 50 is connected to the motor 30 and the motor controller 40 and is configured to detect the rotational angle of the rotor of the motor 30 based on a current supplied to the motor 30. Information regarding the rotational angle of the rotor of the motor 30 detected by the rotational angle detection circuit 50 is sent to the control unit 60 of the motor controller 40.
  • the control unit 60 calculates a current by which a magnetic field is generated at the rotor in order to rotationally drive the godet roller 20 and a current by which a rotational torque is generated, based on a rotational angle of the rotor and a current flowing in the motor 30.
  • the control unit 60 includes a torque current calculation unit.
  • control unit 60 controls an output of the inverter 41 based on the calculated currents.
  • control unit 60 performs so-called vector control so as to independently control a current for generating a magnetic field at the rotor and a current for generating a rotational torque.
  • control unit 60 includes a memory (not illustrated) which is configured to store a rotational torque generated in each of the godet rollers 20a to 20e, in association with a current by which the rotational torque is generated.
  • the control unit 60 arranges the frequency of a sine wave alternating current output from each inverter 41 to be constant at a predetermined value so that the rotation speed of each of the godet rollers 20a to 20e is constant at a predetermined speed when no yarns Y are wound onto each of the godet rollers 20a to 20e.
  • each motor 30 therefore generates a predetermined rotational torque corresponding to the load applied to each of the godet rollers 20a to 20e, in order to keep the rotation speed of each of the godet rollers 20a to 20e, to which the load is applied due to windage loss, friction loss, etc., to be constant at a predetermined speed.
  • the rotational torque at this stage is termed a first rotational torque.
  • the control unit 60 acquires a first current (first predetermined value) output to the motor 30 in accordance with the first rotational torque and stores the first current in the memory, based on the rotational angle of the rotor of the motor 30 detected by the rotational angle detection circuit 50 (step S1).
  • the control unit 60 For each of the godet rollers 20a to 20e, the control unit 60 performs a first failure determination process of determining whether the first current acquired in the first rotational torque information acquisition process is out of a first predetermined range (step S2).
  • the first predetermined range is a range of currents output to the motor 30 when the spun yarn drawing apparatus 3 operates normally.
  • the first predetermined range is, for example, set for each of the godet rollers 20a to 20e by an operator in advance.
  • the control unit 60 executes a first notification process of notifying the operator that there is a failure in the spun yarn drawing apparatus 3 (step S3).
  • the notification is, for example, done by producing warning sound or by a notification on a display or a warning lamp.
  • the notification may be done in various ways as long as the operator is notified that there is a failure in the spun yarn drawing apparatus 3.
  • the control unit 60 stops the spun yarn drawing apparatus 3.
  • the yarns Y spun out from the spinning apparatus 2 are wound onto the godet rollers 20a to 20e (step S4) .
  • This winding of the yarns Y may be done by the operator or may be automatically done by a robot.
  • the control unit 60 then arranges the frequency of a sine wave alternating current output from each inverter 41 to be constant at a predetermined value so that the rotation speed of each of the godet rollers 20a to 20e is constant at a predetermined speed while yarns Y are wound onto each of the godet rollers 20a to 20e.
  • the rotation speed of each of the godet rollers 20a to 20e at this stage is identical with the rotation speed of each of the godet rollers 20a to 20e in the first rotational torque information acquisition step.
  • load due to the tension of the yarns Y is further applied to each of the godet rollers 20a to 20e on which the yarns Y are wound.
  • the godet roller 20d receives (i) a tension T1 of the yarns Y on the upstream of the godet roller 20d in a yarn running direction (indicated by arrows in FIG. 2 and FIG. 4 ) which run from the inlet 12a toward the outlet 12b and (ii) a tension T2 of the yarns Y on the downstream of the godet roller 20d in the yarn running direction.
  • the tension T1 acts in the direction opposite to the rotational direction of the godet roller 20d, whereas the tension T2 acts in the same direction as the rotational direction of the godet roller 20d.
  • the godet roller 20d further receives load caused by a tension difference (T1-T2) between the tensions T1 and T2 of the yarns Y.
  • each motor 30 generates a predetermined rotational torque corresponding to the load applied to each of the godet rollers 20a to 20e, in order to keep the rotation speed of each of the godet rollers 20a to 20e, to which load is applied due to the tension difference (T1-T2) in addition to the windage loss, friction loss, etc., to be constant at a predetermined speed.
  • the rotational torque at this stage is termed a second rotational torque.
  • the control unit 60 acquires a second current (second predetermined value) output to the motor 30 in accordance with the second rotational torque and stores the acquired second current in the memory, based on the rotational angle of the rotor of the motor 30 detected by the rotational angle detection circuit 50 (step S5).
  • the control unit 60 calculates a difference between the tension of the yarns on the upstream in the yarn running direction of the godet roller 20 and the tension of the yarns Y on the downstream in the yarn running direction of the godet roller 20 (hereinafter, this difference in tension may be simply referred to as a tension difference) based on a difference between the first current and the second current stored in the memory (step S6) .
  • the first current is a current corresponding to the first rotational torque generated by the motor 30 in the godet roller 20d which receives load due to the windage loss, friction loss, etc.
  • the second current is a current corresponding to the second rotational torque generated by the motor 30 in the godet roller 20d which receives load due to the tension difference (T1-T2) in addition to the windage loss, friction loss, etc.
  • the difference between the first current and the second current corresponds to the difference between the first rotational torque and the second rotational torque, and therefore corresponds to the tension difference (T1-T2). It is therefore possible to calculate, for each of the godet rollers 20a to 20e, a tension difference (T1-T2) based on a difference between the first current and the second current.
  • a conversion table for converting a difference between the first current and the second current to a tension difference is set in advance and stored in the memory of the control unit 60.
  • the control unit 60 acquires a tension difference of the yarns Y in each of the godet rollers 20a to 20e by converting a difference between the first current and the second current into a tension difference based on the conversion table.
  • the tension difference in the present embodiment is equivalent to a tension-related value related to a yarn wound onto a roller in the present invention.
  • the control unit 60 executes a second failure determination process to determine whether a tension difference of the yarns Y in each of the godet rollers 20a to 20e acquired in the yarn tension calculation process is out of a second predetermined range (step S7).
  • the second predetermined range is an allowable range of tension differences in each of the godet rollers 20a to 20e, when the tension of the yarns Y is appropriate. This range is, for example, set for each of the godet rollers 20a to 20e by an operator in advance.
  • the control unit 60 executes a second notification process of notifying the operator that the tension of the yarns Y wound onto the godet roller 20 whose tension difference is out of the second predetermined range is erroneous (step S8).
  • the notification is, in the same manner as in the first notification process, for example, done by producing warning sound or by a notification on a display or a warning lamp.
  • the notification may be done in various ways as long as the operator is notified that the tension of the yarns Y wound onto the godet roller 20 is erroneous.
  • control unit 60 performs an adjustment process of adjusting the rotational torque generated in the godet roller 20 by the motor 30 and the inverter 41 so that the tension differences of the yarns Y wound onto all godet rollers 20 fall within the second predetermined range (later-described step S11).
  • the control unit 60 executes, to begin with, a third failure determination process to determine whether a tension difference of the yarns Y on each of the godet rollers 20a to 20e is out of a third predetermined range (step S9).
  • the third predetermined range is wider than the second predetermined range in the second failure determination process (S7), and is an allowable range of tension differences on each of the godet rollers 20a to 20e when the yarns Y are not broken.
  • the third predetermined range is, for example, set for each of the godet rollers 20a to 20e by the operator in advance.
  • the control unit 60 executes a third notification process of notifying the operator that the yarns Y are broken at a part of the spun yarn take-up machine 1 (step S10).
  • the notification is, in the same manner as in the first notification process and the second notification process, for example, done by producing warning sound or by a notification on a display or a warning lamp.
  • the notification may be done in various ways as long as the operator is notified that the tension of the yarns Y wound onto the godet roller 20 is erroneous.
  • the second notification process and the third notification process are distinguishable.
  • the warning sound in the second notification process is preferably different from the warning sound in the third notification process.
  • the control unit 60 stops the spun yarn drawing apparatus 3.
  • a way of displaying a warning is preferably different between the second notification process and the third notification process.
  • the control unit 60 determines that the yarns Y are not broken at any part of the spun yarn take-up machine 1. The control unit 60 then performs an adjustment process of adjusting the rotational torque generated in any of the godet rollers 20a to 20e by the motor 30 and the inverter 40 so that the tension differences of the yarns Y wound onto all godet rollers 20 fall within the second predetermined range (step S11). Thereafter, the control unit 60 goes back to the step S5 and executes the second rotational torque information acquisition process again.
  • control unit 60 determines whether the yarn winding apparatus 4 provided below the spun yarn drawing apparatus 3 has completed the winding of the yarns Y (step S12).
  • the control unit 60 of the spun yarn drawing apparatus 3 is connected to the yarn winding apparatus 4.
  • the control unit 60 goes back to the step S5 and executes the second rotational torque information acquisition process again.
  • the spun yarn drawing apparatus 3 finishes the operation.
  • the yarns Y spun out from the spinning apparatus 2 are wound onto each of the godet rollers 20a to 20e of the spun yarn drawing apparatus 3, production of the yarns Y by the spun yarn take-up machine 1 is performed, i.e., drawing by the spun yarn drawing apparatus 3 and production of packages P by the yarn winding apparatus 4 are performed. Therefore, in the present embodiment, tension differences of the yarns Y wound onto the godet rollers 20 are always measured and adjusted to suitable values in the process of producing the yarns Y.
  • the spun yarn drawing apparatus 3 of the present embodiment includes the godet rollers 20a to 20e each being capable of winding the running yarns Y onto a circumferential surface of the godet roller, the inverter 41 configured to output a current, the motor 30 configured to generate a rotational torque corresponding to the current output from the inverter 41 in the godet rollers 20a to 20e, the rotational angle detection circuit 50 configured to detect the rotational angle of the rotor of the motor 30, and the control unit 60 including the torque current calculation unit which is configured to calculate a current corresponding to the rotational torque based on the rotational angle of the rotor.
  • the control unit 60 then executes: the first rotational torque information acquisition process of acquiring the first current corresponding to the first rotational torque generated in the godet roller 20 when no yarns Y are wound onto the godet roller 20 while the rotation speed of each of the godet rollers 20a to 20e is arranged to be constant at a predetermined speed; the second rotational torque information acquisition process of acquiring the second current corresponding to the second rotational torque generated in the godet toller 20 when the yarns Y are wound onto the godet roller 20 while the rotation speed of each of the godet rollers 20a to 20e is arranged to be constant at the predetermined speed; and the yarn tension calculation process of calculating a tension-related value related to the tension of the yarns Y wound onto each of the godet rollers 20a to 20e based on a difference between the first current and the second current.
  • the tension-related value of the yarns Y can be calculated based on a difference between the first current and the second current which correspond to the first rotational torque and the second rotational torque, respectively.
  • the first rotational torque is a rotational torque when the yarns Y are wound onto the godet rollers 20
  • the second rotational torque is a rotational torque when the yarns Y are not wound onto the godet rollers 20. It is therefore unnecessary to provide a tension sensor to detect the tension of the yarns Y. In this way, it is possible in the spun yarn drawing apparatus 3 to always detect the tension of the yarns Y with ease, without deteriorating the quality of the yarns Y.
  • the tension-related value of the yarns Y is easily detected as compared to a case where the tension of the yarns Y is directly detected. Furthermore, because the current corresponding to the rotational torque is acquired based on the rotational angle of the rotor of the motor 30, complicated control is not required and the tension of the yarns Y can be further easily detected.
  • a tension-related value of the yarns Y is a tension difference between the tension of the yarns Y on the upstream of the godet rollers 20a to 20e in the yarn running direction and the tension of the yarns Y on the downstream of the godet rollers 20a to 20e in the yarn running direction.
  • a tension difference between the tension of the yarns Y on the upstream of a godet roller 20 in the yarn running direction and the tension of the yarns Y on the downstream of the godet roller 20 in the yarn running direction is determined in advance based on the characteristics (e.g., the rotation speed and the magnitude of the rotational torque) of the godet roller 20 and the type of the yarns Y to be wound. According to the present embodiment, it is possible to easily determine whether the tension of the yarns Y is appropriate, by comparing a tension difference calculated in the yarn tension calculation process with a tension difference determined in advance.
  • the control unit 60 further executes the first failure determination process of determining whether the first current acquired in the first rotational torque information acquisition process is out of the first predetermined range and the first notification process of notifying that there is a failure in the spun yarn drawing apparatus 3 when it is determined in the first failure determination process that the first current is out of the first predetermined range.
  • the first current is a current corresponding to the rotational torque of each of the godet rollers 20a to 20e when no yarns Y are wound onto the godet rollers 20.
  • the control unit 60 further executes: the second failure determination process of determining whether the tension difference (tension-related value) calculated in the yarn tension calculation process is out of the second predetermined range; the second notification process of notifying that there is a failure in the tension of the yarns Y wound on the godet roller 20 when it is determined in the second failure determination process that the tension difference is out of the second predetermined range; and the adjustment process of adjusting the rotational torque generated in the godet roller 20 by the motor 30.
  • the operator is able to reliably know whether the tension of the yarns Y wound on each of the godet rollers 20a to 20e is normal or not. Furthermore, the tension of the yarns Y wound on the godet roller 20 is maintained to be always appropriate, and hence the quality of the yarns Y is maintained to be constant in the spun yarn drawing apparatus 3.
  • control unit 60 further executes the third failure determination process of determining whether the tension difference (tension-related value) calculated in the yarn tension calculation process is out of the third predetermined range and the third notification process of notifying that the yarns Y are broken when it is determined in the third failure determination process that the tension difference is out of the third predetermined range. According to the present embodiment, the operator is able to reliably and promptly know that the yarns Y are broken.
  • the conversion table is set in advance to convert a difference between the first current and the second current into a tension difference (tension-related value) of the yarns Y, and the control unit 60 calculates a tension difference based on the conversion table in the yarn tension calculation process. According to the present embodiment, because a tension difference is calculated based on the conversion table set in advance, a complicated calculation process is unnecessary, and the tension of yarns can be further easily detected.
  • the first predetermined value and the second predetermined value are the first current and the second current output to the motor 30, respectively.
  • the first predetermined value and the second predetermined value are stored in a memory in the control unit 60.
  • the rollers are the godet rollers 20a to 20e accommodated in the thermal insulation box 12 of the spun yarn drawing apparatus 3, and each of these godet rollers 20a to 20e has the arrangement of the present invention.
  • the control unit 60 does not execute the processes such as the first rotational torque information acquisition process, the second rotational torque information acquisition process, the yarn tension calculation process, the first to third failure determination processes, the first to third notification processes, and the adjustment process.
  • the number of the godet rollers may not be plural, and may be one. In this case, the one godet roller has the arrangement of the present invention.
  • the control unit 60 acquires the first current (first predetermined value) and the second current (second predetermined value) for each of the godet rollers 20a to 20e.
  • the control unit 60 may acquire the first current and the second current for only one of the godet rollers 20a to 20e.
  • the first current and the second current of the other godet rollers are acquired in a relative manner with reference to the first current and the second current of the one godet roller acquired by actual measurement, and these currents are stored in a memory.
  • the control unit 60 acquires, for the godet roller 20a, the first current output to the motor 30 in accordance with the first rotational torque, and stores the acquired first current in the memory.
  • the control unit 60 acquires, for each of the other godet rollers 20b to 20e, the first current output to the motor 30 in accordance with the first rotational torque in a relative manner with reference to the first current of the godet roller 20a stored in the memory, and stores the acquired first currents in the memory.
  • the second current is acquired in a similar manner. It is therefore possible to easily and rapidly execute the first rotational torque information acquisition process and the second rotational torque information acquisition process, as compared to a case where the first predetermined value and the second predetermined value are independently acquired for each of the godet rollers 20a to 20e.
  • the first predetermined range, the second predetermined range, and the third predetermined range are set for each of the godet rollers 20a to 20e.
  • the first predetermined range, the second predetermined range, and the third predetermined range may be set for only one of the godet rollers 20a to 20e.
  • the upper limits and the lower limits of the first predetermined range, the second predetermined range, and the third predetermined range of the other godet rollers are set in a relative manner, with reference to the upper limits and the lower limits of the first predetermined range, the second predetermined range, and the third predetermined range of the one godet roller.
  • the textile machine is the spun yarn drawing apparatus 3.
  • the textile machine may be a draw texturing machine.
  • the roller is feed rollers.
  • the feed rollers for example, include a drive roller and a driven roller. As the drive roller is rotationally driven while yarns are sandwiched between the drive roller and the driven roller, the yarns are fed in the yarn running direction. Therefore, to be more specific, the roller is a drive roller among the feed rollers.
  • the rollers may be godet rollers in the spun yarn take-up machine 1, which are not of the spun yarn drawing apparatus 3.
  • the motor 30 is a permanent magnet synchronous motor.
  • the motor 30 may be a DC brush motor.
  • a current supplied to the motor 30 must be a direct current.
  • the inverter 41 is therefore a DC inverter.
  • both the rotational torque and the rotation speed of the godet roller 20 are determined by the magnitude of the current controlled by the DC inverter 41. Therefore the control unit 60 does not perform the vector control, and controls a current generating a magnetic field at the rotor and a current generating the rotational torque in an integrated manner.
  • control unit 60 converts a difference between the first current and the second current into a tension difference of the yarns Y at the godet roller 20, based on the conversion table which is set in advance.
  • a mathematical expression for converting a difference between the first current and the second current into a tension difference of the yarns Y may be set in advance. In this case, the tension difference of the yarns Y is calculated by inputting the difference between the first current and the second current into the mathematical expression.
  • a tension-related value related to the tension of yarns wound onto a roller is a tension difference between the tension of the yarns Y on the upstream of the godet roller 20 in the yarn running direction and the tension of the yarns Y on the downstream of the godet roller 20 in the yarn running direction.
  • the tension-related value may directly indicate the tension of the yarns Y wound onto the godet roller 20, or may indicate the ratio of the tension of the yarns Y on the upstream of the godet roller 20 in the yarn running direction to the tension of the yarns Y on the downstream of the godet roller 20 in the yarn running direction. The user is allowed to suitably select one of these types of tension-related values.
  • the control unit 60 calculates a tension-related value of the yarns Y based on a difference between the first current and the second current.
  • the control unit 60 may calculate a tension-related value of the yarns Y based on the ratio of the first current to the second current.
  • the control unit 60 may calculate a tension-related value of the yarns Y by performing a predetermined calculation process for the first current and the second current.
  • the rotational angle detection circuit 50 is provided in the embodiment above.
  • control unit 60 stops the spun yarn drawing apparatus 3 after executing the first notification process and the third notification process.
  • control unit 60 may stop the spun yarn drawing apparatus 3 while the first notification process and the third notification process are being executed, or may stop the spun yarn drawing apparatus 3 at the same time as the execution of the first notification process and the third notification process.
  • the third failure determination process is executed after the second notification process.
  • the third failure determination process may be executed prior to the second failure determination process.
  • the control unit 60 executes the third failure determination process after the yarn tension calculation process.
  • the control unit 60 further executes the second failure determination process.
  • the third predetermined range is wider than the second predetermined range in the second failure determination process.
  • the third failure determination process may not be executed.
  • the control unit 60 executes the second notification process and the adjustment process.
  • the control unit 60 may execute only one of the second notification process and the adjustment process. For example, when the adjustment process is not executed, the control unit 60 stops the spun yarn drawing apparatus 3 after executing the second notification process.
  • the control unit 60 determines whether the yarn winding apparatus 4 provided below the spun yarn drawing apparatus 3 has completed the winding of the yarns Y. In the case, above, furthermore, the tension difference of the yarns Y calculated in the yarn tension calculation process is, for example, checked by the operator. When the tension difference of the yarns Y falls within the third predetermined range but is not an appropriate value, the control unit 60 stops the spun yarn drawing apparatus 3 based on a signal input by the operator.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Quality & Reliability (AREA)
  • Filamentary Materials, Packages, And Safety Devices Therefor (AREA)
EP21153427.6A 2020-02-20 2021-01-26 Textile machine and yarn tension detection Active EP3868695B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2020027249A JP7390207B2 (ja) 2020-02-20 2020-02-20 繊維機械及び糸張力把握方法

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EP3868695A1 EP3868695A1 (en) 2021-08-25
EP3868695B1 true EP3868695B1 (en) 2024-05-01

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Family Cites Families (13)

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Publication number Priority date Publication date Assignee Title
JPH07122193B2 (ja) * 1991-09-21 1995-12-25 新雄 垣中 サイザー
JPH06117948A (ja) * 1992-10-02 1994-04-28 Toray Ind Inc 張力測定方法および装置
DE19840408A1 (de) 1997-09-12 1999-03-18 Barmag Barmer Maschf Verfahren zum Messen einer Fadenzugkraft
JP3007346B1 (ja) 1998-12-25 2000-02-07 川崎重工業株式会社 紡糸設備の繊維延伸装置
JP2004027476A (ja) * 2003-09-05 2004-01-29 Tsudakoma Corp 経糸準備機械の張力付与方法およびその装置
JP2010180007A (ja) * 2009-02-04 2010-08-19 Murata Machinery Ltd 糸処理方法及び紡績機
JP5937945B2 (ja) * 2012-10-12 2016-06-22 Ｔｍｔマシナリー株式会社 紡糸延伸装置
JP2014185001A (ja) * 2013-03-22 2014-10-02 Toray Ind Inc 高弾性率糸条張力の調整方法、および高弾性率糸条を用いた高次加工製品の製造方法
WO2015028309A1 (de) 2013-08-31 2015-03-05 Oerlikon Textile Gmbh & Co. Kg Verfahren zum erkennen eines fadenwickels und vorrichtung zum führen eines fadens
JP6530259B2 (ja) 2014-08-12 2019-06-12 Ｔｍｔマシナリー株式会社 紡糸延伸装置、及び、紡糸延伸方法
BE1023220B1 (nl) * 2015-07-03 2017-01-03 Nv Michel Van De Wiele Aanvoerinrichting voor aanvoeren van garens, werkwijze voor het bepalen van de spanning van garens en gebruik van controlemiddelen voor het aansturen van actuatoren voor het aanvoeren van garens
EP3153609B1 (de) * 2015-10-05 2021-11-10 Hanning Elektro-Werke GmbH & Co. KG Antriebsanordnung für eine textilmaschine
JP7128574B2 (ja) 2018-03-16 2022-08-31 Ｔｍｔマシナリー株式会社 仮撚加工機

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JP7390207B2 (ja) 2023-12-01
EP3868695A1 (en) 2021-08-25
CN113279095A (zh) 2021-08-20
JP2021130552A (ja) 2021-09-09

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