EP3950552B1 - Yarn winder - Google Patents

Yarn winder Download PDF

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Publication number
EP3950552B1
EP3950552B1 EP21183951.9A EP21183951A EP3950552B1 EP 3950552 B1 EP3950552 B1 EP 3950552B1 EP 21183951 A EP21183951 A EP 21183951A EP 3950552 B1 EP3950552 B1 EP 3950552B1
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EP
European Patent Office
Prior art keywords
yarn
tension
traverse
unit
traverse guide
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
EP21183951.9A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP3950552A1 (en
Inventor
Shiro Bando
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
TMT Machinery Inc
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TMT Machinery Inc
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Filing date
Publication date
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Publication of EP3950552A1 publication Critical patent/EP3950552A1/en
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Publication of EP3950552B1 publication Critical patent/EP3950552B1/en
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H59/00—Adjusting or controlling tension in filamentary material, e.g. for preventing snarling; Applications of tension indicators
    • B65H59/005—Means compensating the yarn tension in relation with its moving due to traversing arrangements
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • 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
    • 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
    • B65H51/02—Rotary devices, e.g. with helical forwarding surfaces
    • B65H51/04—Rollers, pulleys, capstans, or intermeshing rotary elements
    • B65H51/06—Rollers, pulleys, capstans, or intermeshing rotary elements arranged to operate singly
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H54/00—Winding, coiling, or depositing filamentary material
    • B65H54/02—Winding and traversing material on to reels, bobbins, tubes, or like package cores or formers
    • B65H54/28—Traversing devices; Package-shaping arrangements
    • B65H54/2821—Traversing devices driven by belts or chains
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H54/00—Winding, coiling, or depositing filamentary material
    • B65H54/02—Winding and traversing material on to reels, bobbins, tubes, or like package cores or formers
    • B65H54/40—Arrangements for rotating packages
    • B65H54/44—Arrangements for rotating packages in which the package, core, or former is engaged with, or secured to, a driven member rotatable about the axis of the package
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H59/00—Adjusting or controlling tension in filamentary material, e.g. for preventing snarling; Applications of tension indicators
    • B65H59/38—Adjusting or controlling tension in filamentary material, e.g. for preventing snarling; Applications of tension indicators by regulating speed of driving mechanism of unwinding, paying-out, forwarding, winding, or depositing devices, e.g. automatically in response to variations in tension
    • B65H59/384—Adjusting or controlling tension in filamentary material, e.g. for preventing snarling; Applications of tension indicators by regulating speed of driving mechanism of unwinding, paying-out, forwarding, winding, or depositing devices, e.g. automatically in response to variations in tension using electronic means
    • B65H59/385—Regulating winding speed
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H59/00—Adjusting or controlling tension in filamentary material, e.g. for preventing snarling; Applications of tension indicators
    • B65H59/40—Applications of tension indicators
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2701/00—Handled material; Storage means
    • B65H2701/30—Handled filamentary material
    • B65H2701/31—Textiles threads or artificial strands of filaments

Definitions

  • the present invention relates to a yarn winder.
  • WO2020075383A1 discloses a yarn winder configured to wind a running yarn onto a bobbin, so as to form a package.
  • the yarn winder includes a traverse unit having a traverse guide for traversing the yarn along the axial direction of the bobbin, a winding unit for rotating the bobbin, and a roller (feed roller) for feeding the yarn to the winding unit.
  • Tension is applied to the yarn by the difference between the winding speed at which the yarn is wound onto the bobbin and the yarn feeding speed at which the yarn is sent by the feed roller.
  • the yarn winder includes a tension applying unit configured to apply tension to the yarn which is wound onto the bobbin) . Because tension is controlled to be at a predetermined value in this way, a package with a predetermined winding density is formed in accordance with the use.
  • the tension which is actually applied to the yarn may vary due to a reciprocal movement of the traverse guide. For example, when the traverse guide is moved from the center toward one end side in an area where the traverse guide reciprocates in a predetermined traverse direction, the tension may be unintentionally increased because the length of a yarn path is increased and the yarn is pulled outward by the traverse guide in the area where the traverse guide reciprocates in the traverse direction. Meanwhile, when the direction of the traverse guide is switched from the outward to the inward in the area where the traverse guide reciprocates in the traverse direction, the tension may be unintentionally decreased because the length of the yarn path is decreased and the yarn is temporarily pulled by the traverse guide more gently than usual.
  • time lag delay
  • the time lag is caused by, for example, the time required for calculation performed by the tension adjustment unit and the time required for the response of a tension applying unit. Due to such a delay, for example, when the traverse cycle is short (i.e., the movement of the traverse guide is quick), actual tension adjustment may not sufficiently follow a variation of tension which is caused by the movement of the traverse guide. This may cause a problem in which a variation of tension is not sufficiently suppressed.
  • WO2020075383A1 and EP1318097B1 are silent on the above-described time lag.
  • An object of the present invention is to effectively suppress a variation of tension due to the reciprocal movement of a traverse guide.
  • the adjustment information corresponding to the first time point is obtained in association with the prediction information corresponding to the second time point which is a time point after the elapse of a predetermined time (i.e., which is a predetermined time later) from the first time point.
  • "obtained in association with” indicates that there is some relation (such as calculation and link) between the adjustment information corresponding to the first time point and the prediction information corresponding to the second time point.
  • the predetermined time can be set or determined in consideration of the above-described time lag (delay).
  • the tension adjustment unit to output a signal at a time point earlier than the second time point by a predetermined time.
  • the signal is related to the adjustment, which is supposed to be actually executed at the second time point, of the tension. Because of this, the above-described delay is compensated, and thus the tension is adjusted at an appropriate timing. Therefore, the variation of the tension due to the reciprocal movement of the traverse guide is effectively suppressed.
  • the yarn winder of the first aspect is arranged such that the predetermined time is shorter than a reciprocal cycle of the traverse guide.
  • the predetermined time is shorter than the reciprocal cycle of the traverse guide. Because of this, it is possible to suppress the increase in difference between a predicted position and/or predicted speed of the traverse guide at the second time point and an actual position and/or actual speed of the traverse guide at the second time point. In this regard, the predicted position and the predicted speed are predicted at the first time point. The tension is therefore finely controllable.
  • the yarn winder of the first or second aspect further includes a tension detection unit configured to detect the tension applied to the yarn, and the tension adjustment unit obtains the adjustment information based on a detection result of the tension detection unit.
  • the tension of the yarn may be varied not only due to the reciprocal movement of the traverse guide but also due to other disturbance factors.
  • By obtaining the adjustment information based on a detection result of the tension detection unit it is possible to perform a feedback control so that the magnitude of the tension is close to a predetermined target value in the present invention. Therefore, because the variation of the tension due to disturbance factors except the reciprocal movement of the traverse guide is also suppressed, the tension is further stabilized.
  • the yarn winder of any one of the first to third aspects is arranged such that the tension applying unit includes: a winding unit configured to wind the yarn onto the bobbin; and a yarn feeding unit configured to send the yarn to the bobbin, the tension applying unit applies the tension to the yarn by utilizing a difference between a winding speed at which the yarn is wound onto the bobbin by the winding unit and a yarn feeding speed at which the yarn is sent to the bobbin by the yarn feeding unit, and the tension adjustment unit controls the tension by controlling the yarn feeding unit.
  • the tension applying unit includes: a winding unit configured to wind the yarn onto the bobbin; and a yarn feeding unit configured to send the yarn to the bobbin
  • the tension applying unit applies the tension to the yarn by utilizing a difference between a winding speed at which the yarn is wound onto the bobbin by the winding unit and a yarn feeding speed at which the yarn is sent to the bobbin by the yarn feeding unit
  • the tension adjustment unit controls the tension by controlling the yarn feeding unit.
  • the tension When the tension is applied to the yarn Y by difference between the winding speed and the yarn feeding speed, the tension can be controlled by controlling the winding speed.
  • a winding angle this angle is a helix angle
  • the tension is controlled by controlling the yarn feeding speed, the control of the tension is simplified as compared to cases where the winding unit is controlled in order to control the tension.
  • the yarn winder of any one of the first to fourth aspects is arranged such that the control unit changes a target value of the tension during the reciprocal cycle of the traverse guide.
  • control in which the variation of the tension is suppressed in consideration of the above-described time lag in the present invention is especially effective in the structure configured so that a target value of the tension is changed during the reciprocal cycle of the traverse guide.
  • the yarn winder of the fifth aspect is arranged such that the control unit arranges a target value of the tension when the traverse guide is positioned at one end in a traverse area where the traverse guide reciprocates in regard to the traverse direction to be lower than a target value of the tension when the traverse guide is positioned at a center in the traverse area.
  • the yarn When the tension of the yarn is high while the traverse guide is positioned at one end side in the traverse area, the yarn may be unintentionally pulled inward in the axial direction of the bobbin at the time of changing the direction of the traverse guide. As a result, an amount of the yarn wound onto the inside of a target position in the axial direction of the bobbin may be increased so as to deteriorate the shape of a package.
  • the tension when the traverse guide is positioned at one end side in the traverse area is arranged to be low. It is therefore possible to suppress the yarn from being unintentionally pulled inward in the axial direction of the bobbin at the time of changing the direction of the traverse guide.
  • An up-down direction and a left-right direction shown in FIG. 1 will be referred to as an up-down direction and a left-right direction of a re-winder 1.
  • a direction orthogonal to both the up-down direction and the left-right direction i.e., a direction perpendicular to the plane of FIG. 1
  • a direction in which a yarn Y runs will be referred to as a yarn running direction.
  • FIG. 1 is a schematic front view of the re-winder 1.
  • the re-winder 1 includes a frame 11, a yarn supplying unit 12, a winding unit 13, a yarn feeding unit 14, and a controller 15 (a control unit of the present invention).
  • the re-winder 1 is configured to unwind a yarn Y from a yarn supply package Ps supported by the yarn supplying unit 12 and to re-wind the yarn Y back to a winding bobbin Bw (a bobbin of the present invention) by the winding unit 13, so as to form a wound package Pw.
  • the re-winder 1 is used for, for example, re-winding the yarn Y wound on a yarn supply package Ps in a more beautiful manner and for forming a wound package Pw with a desired density.
  • the frame 11 is provided to extend in the up-down direction.
  • the frame 11 vertically extends on, e.g., an unillustrated floor.
  • the yarn supplying unit 12 is provided at a lower part of the frame 11.
  • the winding unit 13 is provided at an upper part of the frame 11, the yarn feeding unit 14 is provided at an intermediate portion of the frame 11 in the up-down direction.
  • the yarn supplying unit 12 is provided at the lower part of the frame 11.
  • the yarn supplying unit 12 is arranged to support the yarn supply package Ps which is formed by winding the yarn Y onto a yarn supplying bobbin Bs.
  • the yarn supplying unit 12 is therefore able to supply the yarn Y.
  • the winding unit 13 is configured to form the wound package Pw by winding the yarn Y onto the winding bobbin Bw.
  • the winding unit 13 is provided at the upper part of the frame 11.
  • the winding unit 13 includes a cradle arm 21, a winding motor 22, a traverse unit 23, and a contact roller 24.
  • the cradle arm 21 is, for example, attached to the frame 11 to be swingable.
  • the cradle arm 21 is arranged to support the winding bobbin Bw to be rotatable in such a way that, for example, the left-right direction is the axial direction of the winding bobbin Bw.
  • a bobbin holder (not illustrated) is rotatably attached to hold the winding bobbin Bw.
  • the winding motor 22 is a motor configured to rotationally drive the bobbin holder.
  • the winding motor 22 is, e.g., a typical stepping motor.
  • the winding motor 22 may include a rotary encoder (not illustrated) configured to detect a rotation angle of a rotational shaft (not illustrated) of the winding motor 22.
  • the winding motor 22 is configured so that the number of rotations of its rotational shaft (i.e., the number of rotations per a predetermined time) is variable.
  • the winding motor 22 is therefore able to change the winding speed at which the yarn Y is wound onto the winding bobbin Bw (i.e., the circumferential speed of a surface of the wound package Pw).
  • the winding motor 22 is electrically connected to the controller 15 (see FIG. 2 ).
  • the traverse unit 23 is configured to traverse the yarn Y along the axial direction of the winding bobbin Bw (the left-right direction in the present embodiment).
  • the traverse unit 23 is provided immediately upstream of the wound package Pw in the yarn running direction.
  • the traverse unit 23 includes a traverse motor 31, an endless belt 32, and a traverse guide 33.
  • the traverse motor 31 is, e.g., a typical stepping motor.
  • the traverse motor 31 is configured to enable its rotational shaft (not illustrated) to be rotated forward and backward.
  • the traverse motor 31 may include a rotary encoder (not illustrated) configured to detect a rotation angle of the rotational shaft (not illustrated) of the traverse motor 31.
  • the traverse motor 31 is configured so that the number of rotations of its rotational shaft is variable.
  • the traverse motor 31 is electrically connected to the controller 15 (see FIG. 2 ).
  • the endless belt 32 is a belt member to which the traverse guide 33 is attached.
  • the endless belt 32 is wound onto pulleys 34 and 35 which are separated from each other in the left-right direction and a driving pulley 36 connected to the rotational shaft of the traverse motor 31, and is substantially triangular in shape when wound onto the pulleys.
  • the endless belt 32 is reciprocally driven by the traverse motor 31.
  • the traverse guide 33 is attached to the endless belt 32 and is provided between the pulley 34 and the pulley 35 in the left-right direction.
  • the traverse guide 33 linearly and reciprocally runs in the left-right direction as the endless belt 32 is reciprocally driven by the traverse motor 31 (see arrows in FIG. 1 ).
  • the traverse guide 33 traverses the yarn Y in the left-right direction (hereinafter, this direction may be referred to as a traverse direction).
  • the contact roller 24 makes contact with the surface of the wound package Pw and applies a contact pressure to the surface, so as to adjust the shape of the wound package Pw.
  • the contact roller 24 makes contact with the wound package Pw and is rotated by the rotation of the wound package Pw.
  • the yarn feeding unit 14 is configured to send the yarn Y unwound from the yarn supply package Ps, to the winding bobbin Bw.
  • the yarn feeding unit 14 is provided between the yarn supplying unit 12 and the winding unit 13 in the yarn running direction.
  • the yarn feeding unit 14 includes a feed roller 41 and a roller drive motor 42.
  • the feed roller 41 is a roller onto which the yarn Y is wound.
  • the feed roller 41 is, e.g., a known nip roller.
  • the feed roller 41 is provided on a front surface of the frame 11.
  • the feed roller 41 is configured to rotate so that the yarn Y is sent to the downstream side in the yarn running direction.
  • the feed roller 41 is rotationally driven by the roller drive motor 42.
  • the roller drive motor 42 is, e.g., a typical stepping motor.
  • the roller drive motor 42 may include a rotary encoder (not illustrated) configured to detect a rotation angle of a rotational shaft (not illustrated) of the roller drive motor 42.
  • the roller drive motor 42 is configured so that the number of rotations of its rotational shaft is variable.
  • the roller drive motor 42 is therefore able to change the number of rotations of the feed roller 41 (i.e., able to change the yarn feeding speed of the feed roller 41).
  • the roller drive motor 42 is electrically connected to the controller 15 (see FIG. 2 ).
  • tension is applied to the yarn Y by the difference between the winding speed of the winding unit 13 and the yarn feeding speed of the yarn feeding unit 14. That is, the combination of the structure of the winding unit 13 and the structure of the yarn feeding unit 14 corresponds to a tension applying unit of the present invention.
  • Tension generally increases as the above-described difference between the speeds increases, and tension generally decreases as the above-described difference between the speeds decreases.
  • a yarn guide 16 is provided at a lower part (on the upstream side in the yarn running direction) of the yarn feeding unit 14.
  • the yarn guide 16 is provided, for example, on an extension of the central axis of the yarn supplying bobbin Bs.
  • the yarn guide 16 guides the yarn Y unwound from the yarn supply package Ps, to the downstream side in the yarn running direction.
  • a tension sensor 17 (a tension detection unit of the present invention) is provided at an upper part (on the downstream side in the yarn running direction) of the yarn feeding unit 14.
  • the tension sensor 17 is configured to detect the tension applied to the yarn Y running from the yarn feeding unit 14 toward the winding unit 13.
  • the tension sensor 17 is, e.g., an unillustrated contact-type sensor having a piezoelectric element, the disclosure is not limited to this.
  • the tension sensor 17 is electrically connected to the controller 15 (see FIG. 2 ).
  • the tension sensor 17 outputs a detection signal to the controller 15.
  • the tension sensor 17 functions as a fulcrum guide about which the yarn Y is traversed by the traverse guide 33.
  • a yarn guide (not illustrated) which functions as a fulcrum guide may be provided downstream of the tension sensor 17 in the yarn running direction.
  • the controller 15 includes members such as CPU, a ROM, and a RAM (a storage unit 51; see FIG. 2 ).
  • the storage unit 51 stores, for example, parameters such as an amount of the wound yarn Y, the winding speed, and the target tension which is supposed to be applied to the yarn Y.
  • the controller 15 controls components by using the CPU and a program stored in the ROM, based on the parameters stored in the storage unit 51.
  • the controller 15 is electrically connected to the winding motor 22, the traverse motor 31, the roller drive motor 42, and the tension sensor 17 (see FIG. 2 ).
  • the controller 15 functions as a winding control unit 52, a traverse control unit 53 (a prediction information acquisition unit of the present invention), and a roller control unit 54 (a tension adjustment unit of the present invention; see FIG. 2 ).
  • the controller 15 obtains winding information regarding a target value of the number of rotations of the winding bobbin Bw (or the winding speed of the yarn Y wound by the winding unit 13) from the storage unit 51.
  • the controller 15 outputs a signal for controlling the torque of the winding motor 22 to the winding motor 22, based on the winding information. That is, the controller 15 functions as the winding control unit 52 configured to control the winding motor 22.
  • the controller 15 further obtains target traverse information regarding a target position and target speed of the traverse guide 33, from the storage unit 51.
  • the controller 15 outputs a signal for controlling the torque of the traverse motor 31 to the traverse motor 31, based on the target traverse information. That is, the controller 15 functions as the traverse control unit 53 configured to control the traverse motor 31.
  • the controller 15 further obtains yarn feeding information regarding the number of rotations of the feed roller 41 (i.e., the yarn feeding speed of the yarn feeding unit 14).
  • the controller 15 outputs a signal for controlling the number of rotations of the feed roller 41 (specifically, the torque of the roller drive motor 42) to the roller drive motor 42, based on the yarn feeding information. That is, the controller 15 functions as the roller control unit 54 configured to control the roller drive motor 42.
  • the yarn Y unwound from the yarn supply package Ps runs toward the downstream side in the yarn running direction.
  • the running yarn Y is wound onto the rotating winding bobbin Bw while being traversed in the left-right direction (traverse direction) by the traverse guide 33.
  • the tension applied to the yarn Y is controlled to be close to a predetermined target tension mainly by adjusting the number of rotations of the feed roller 41 (i.e., by adjusting the yarn feeding speed of the yarn feeding unit 14).
  • the tension of the yarn Y is controlled in such a way that the controller 15 (roller control unit 54) adjusts the number of rotations of the feed roller 41 based on rotation number adjustment information (adjustment information of the present invention) regarding the number of rotations of the feed roller 41.
  • rotation number adjustment information adjustment information of the present invention
  • the reciprocal movement of the traverse guide 33 will be described with reference to FIG. 3 .
  • the topmost graph in FIG. 3 shows the relationship between the position, in regard to the traverse direction, of the traverse guide 33 and time points.
  • the lowermost graph in FIG. 3 shows the relationship between the speed, in regard to the traverse direction, of the traverse guide 33 and time points.
  • the horizontal axis indicates time points whereas the vertical axis indicates the position of the traverse guide 33 in regard to the traverse direction.
  • a direction leftward of the center of an area where the traverse guide 33 reciprocates i.e., traverse area
  • a direction rightward of the center of the traverse area will be regarded as a negative direction of the vertical axis of the graph.
  • the traverse guide 33 reciprocates in the left-right direction in such a way that the traverse motor 31 is driven by the controller 15.
  • the symbol "T" shown in FIG. 3 indicates the cycle in which the traverse guide 33 completes a reciprocal movement once.
  • the traverse guide 33 when it is at a time point of 0 in FIG. 3 , the traverse guide 33 is positioned at the center of the traverse area. In addition to that, when it is at a time point of T/4, the traverse guide 33 is positioned at the left end of the traverse area. In addition to that, when it is at a time point of T/2, the traverse guide 33 is positioned at the center of the traverse area. In addition to that, when it is at a time point of is 3T/4, the traverse guide 33 is positioned at the right end of the traverse area.
  • a yarn path from the fulcrum guide (tension sensor 17 in the present embodiment) to the traverse guide 33 is the shortest. Meanwhile, when the traverse guide 33 is positioned at an end of the traverse area, the yarn path is the longest.
  • the speed of the traverse guide 33 varies as shown in the lowermost graph in FIG. 3 .
  • the direction of the traverse guide 33 is switched from leftward to rightward in the traverse area in regard to the traverse direction.
  • the direction of the traverse guide 33 is switched from rightward to leftward in the traverse area in regard to the traverse direction.
  • FIG. 4 shows a graph of the relationship between the position of the traverse guide 33 and time points of a first reference example, a graph of the relationship between the number of rotations of the feed roller 41 and time points of the first reference example, and a graph of the relationship between the tension of the yarn Y and time points of the first reference example.
  • FIG. 5 shows graphs of a second reference example.
  • the topmost graph shows the relationship between the position of the traverse guide 33 and time points.
  • the graph on the middle part in the up-down direction of the figure shows the relationship between the number of rotations of the feed roller 41 and time points.
  • the lowermost graph shows the relationship between the tension of the yarn Y and time points.
  • the magnitude of tension of the yarn Y is roughly determined by the difference between the winding speed and the yarn feeding speed as described above.
  • the tension which is actually applied to the yarn Y may vary due to a reciprocal movement of the traverse guide 33. For example, when the traverse guide 33 is moved from the center toward one end side in the traverse area in regard to the traverse direction, the tension may be unintentionally increased because the length of the yarn path is increased and the yarn Y is pulled outward by the traverse guide 33 in the traverse area in regard to the traverse direction.
  • the tension may be unintentionally decreased because the length of the yarn path is decreased and the yarn Y is temporarily pulled by the traverse guide 33 more gently than usual.
  • control means for suppressing a variation of tension by reflecting a detection result of the tension sensor 17 onto the control of the roller drive motor 42.
  • This control is, e.g., a typical feedback control.
  • This control changes, e.g., the number of rotations of the feed roller 41 as shown in FIG. 4 , with the result that the yarn feeding speed is also changed.
  • this control method changes the yarn feeding speed after tension has been actually varied, the following problems may occur.
  • the adjustment of the yarn feeding speed may not sufficiently follow a variation of tension which is caused by the movement of the traverse guide 33.
  • the actual tension see a solid line in the lower most graph in FIG. 4
  • the target tension see a dotted line in the lowermost graph in FIG. 4
  • control means for adjusting the yarn feeding speed by using information regarding the position and/or speed of the traverse guide 33 there is a control means for adjusting the yarn feeding speed by using information regarding the position and/or speed of the traverse guide 33.
  • information regarding a variation of tension in accordance with the position of the traverse guide 33 is taken into consideration for the adjustment of the yarn feeding speed. That is, when it is predicted that the tension increases due to the movement of the traverse guide 33, the number of rotations of the feed roller 41 is controlled (see FIG. 5 ) so that the yarn feeding speed increases. Meanwhile, when it is predicted that the tension decreases, the number of rotations of the feed roller 41 is controlled (see FIG. 5 ) so that the yarn feeding speed decreases.
  • time lag (delay) between when the controller 15 (roller control 54) obtains information regarding the change in the number of rotations of the feed roller 41 and when the number of rotations of the feed roller 41 is actually changed.
  • the time lag is caused by factors such as the time required for calculation performed by the roller control unit 54, the inertial mass of a rotational shaft (not illustrated) of the roller drive motor 42, and the inertial mass of the feed roller 41. Due to such a delay, for example, when the traverse cycle is very short (i.e., when the movement of the traverse guide 33 is very quick), the adjustment of the yarn feeding speed may not be completed in time.
  • the control means of the second reference example see FIG.
  • the controller 15 of the present embodiment performs control as follows.
  • the later-described method of controlling tension is a method of controlling tension during one cycle (above-described T) in which the traverse guide 33 completes a reciprocal movement once, i.e., during a reciprocal cycle of the traverse guide 33.
  • the target tension is constant (see a broken line in the lowermost graph in FIG. 9 ).
  • the winding speed is substantially constant during the reciprocal cycle of the traverse guide 33.
  • the storage unit 51 stores, e.g., a table in which a target position and target speed of the traverse guide 33 are associated with time.
  • the controller 15 may be configured to calculate the target position and/or the target speed as a function of time.
  • the storage unit 51 may store a table in which one of the target position and target speed of the traverse guide 33 is associated with time. In this case, based on one of the target position and target speed of the traverse guide 33, the controller 15 may calculate the other of these.
  • the controller 15 (traverse control unit 53) controls the operation of the traverse motor 31 based on information regarding the target position and target speed of the traverse guide 33.
  • This information regarding the target position and target speed of the traverse guide 33 is also used as information regarding a future position (predicted position) and future speed (predicted speed) of the traverse guide 33 (hereinafter, this information will be referred to as prediction information).
  • prediction information For example, as shown in the table of FIG. 6 , x1 is a predicted position where the traverse guide 33 is supposed to be positioned at a predetermined time point t1 (first time point of the present invention). In addition to that, a predicted speed of traverse guide 33 is v1 at the time point t1.
  • x2 and v2 are a predicted position and predicted speed of the traverse guide 33 at a time point t2 (second time point of the present invention) which is a time point after the elapse of a predetermined time dt from the time point t1.
  • dt indicates the time shorter than the reciprocal cycle of the traverse guide 33.
  • x3 and v3 are a predicted position and predicted speed of the traverse guide 33 at a time point t3 which is a time point after the elapse of a predetermined time dt from the time point t2.
  • FIG. 7 shows the relationship between a predicted position of the traverse guide 33 at one time point and the desired number of rotations of the feed roller 41 at that time point.
  • the predicted position of the traverse guide 33 at the time point t1 is x1 as described above.
  • the desired number of rotations of the feed roller 41 is, e.g., n1 at the time point t1.
  • the "n1" indicates the number of rotations of the feed roller 41 in consideration of a variation of tension of the yarn Y due to the reciprocal movement of the traverse guide 33, and this number is used for arranging the actual tension at the time point t1 to be substantially identical to the target tension.
  • the desired number of rotations of the feed roller 41 is n2 at the time point t2 (predicted position x2).
  • the desired number of rotations of the feed roller 41 is n3 at the time point t3 (predicted position x3).
  • time lag (delay) between when the controller 15 (roller control unit 54) obtains information regarding the adjustment of the number of rotations of the feed roller 41 (i.e., rotation number adjustment information) and when the number of rotations of the feed roller 41 is actually changed.
  • a time lag is substantially equal to, e.g., an above-described predetermined time dt.
  • the roller control unit 54 controls the yarn feeding unit 14 as follows.
  • the controller 15 is set as follows on the premise that a predetermined time dt is substantially equal to the above time lag.
  • the storage unit 51 stores, e.g., a function used when a command value regarding the number of rotations of the feed roller 41 (hereinafter, this value will be referred to as a rotation number command value) is calculated based on information regarding a predicated future position and predicted future speed of the traverse guide 33 (prediction information).
  • This function is, e.g., a function with a fixed coefficient. (That is, as the same prediction information is input, this function outputs a constant rotation number command value).
  • the roller control unit 54 receives prediction information from the traverse control unit 53, and calculates a rotation number command value with use of the function.
  • the roller control unit 54 calculates a rotation number command value corresponding to the time point t1 (i.e., calculates information regarding a control signal which is supposed to be output at the time point t1 from the roller control unit 54 to the roller drive motor 42), the roller control unit 54 uses prediction information corresponding to the time point t2 which is a time point after the elapse of a predetermined time dt from the time point t1.
  • the prediction information corresponding to the time point t2 is information regarding a predicted position and predicted speed of the traverse guide 33 at the time point t2.
  • the traverse control unit 53 swiftly sends prediction information to the roller control unit 54, the prediction information corresponding to the time point t2 is available for calculating a rotation number command value corresponding to the time point t1.
  • the rotation number command value corresponding to the time point t1 is calculated as n2 (see the table of FIG. 8 and the graph on the middle part of FIG. 9 ). That is, the roller control unit 54 obtains a rotation number command value regarding the predicted position x2 and predicted speed v2 of the traverse guide 33 at the time point t2 (i.e., obtains n2), as rotation number adjustment information corresponding to the time point t1.
  • the rotation number adjustment information corresponding to the time point t1 is obtained in association with prediction information corresponding to the time point t2 which is a time point after the elapse of a predetermined time dt from the time point t1.
  • roller control unit 54 to output a control signal, used for adjusting the number of rotations of the feed roller 41 to n2, at a time point earlier than the time point t2 by a predetermined time dt (see broken lines which vertically extend at the central portion of FIG. 9 ).
  • a control signal used for adjusting the number of rotations of the feed roller 41 to n2 at a time point earlier than the time point t2 by a predetermined time dt (see broken lines which vertically extend at the central portion of FIG. 9 ).
  • a command value regarding the number of rotations of the feed roller 41 see a broken line in the graph on the middle part of FIG.
  • the roller control unit 54 may obtain a rotation number command value further in consideration of a detection result of the tension sensor 17. That is, the roller control unit 54 may finally calculate (generate) a command value regarding the number of rotations of the feed roller 41 (to be more specific, a command value regarding the torque of the roller drive motor 42) based on the above-described rotation number command value and a detection result of the tension sensor 17. Because of this, a variation of tension due to disturbance factors except the reciprocal movement of the traverse guide 33 is also suppressed.
  • rotation number adjustment information corresponding to the time point t1 is obtained in association with prediction information corresponding to the time point t2 which is a time point after the elapse of a predetermined time dt from the time point t1 (i.e., t2 is later than t1 by the predetermined time dt) .
  • This enables the roller control unit 54 to output a signal at a time point which is earlier than the time point t2 by a predetermined time dt.
  • the signal is related to the adjustment, which is supposed to be executed at the time point t2, of the number of rotations of the feed roller 41 (i.e., the adjustment of tension). Because of this, the above-described delay is compensated, and thus tension is adjusted at an appropriate timing. Therefore, a variation of tension due to the reciprocal movement of the traverse guide 33 is effectively suppressed.
  • a predetermined time dt is shorter than the reciprocal cycle of the traverse guide 33. Because of this, it is possible to suppress the increase in difference between a predicted position of the traverse guide 33 at the time point t2 and an actual position of the traverse guide 33 at the time point t2. In this regard, the predicted position is predicted at the time point t1. Tension is therefore finely controllable.
  • the yarn feeding speed of the yarn feeding unit 14 is controlled so as to control tension. Therefore, the control of tension is simplified as compared to cases where the winding unit 13 is controlled in order to control tension.

Landscapes

  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Winding Filamentary Materials (AREA)
  • Tension Adjustment In Filamentary Materials (AREA)
  • Filamentary Materials, Packages, And Safety Devices Therefor (AREA)
EP21183951.9A 2020-08-07 2021-07-06 Yarn winder Active EP3950552B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2020134762A JP2022030632A (ja) 2020-08-07 2020-08-07 糸巻取機

Publications (2)

Publication Number Publication Date
EP3950552A1 EP3950552A1 (en) 2022-02-09
EP3950552B1 true EP3950552B1 (en) 2023-05-10

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EP21183951.9A Active EP3950552B1 (en) 2020-08-07 2021-07-06 Yarn winder

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EP (1) EP3950552B1 (zh)
JP (1) JP2022030632A (zh)
CN (1) CN114057030A (zh)
TW (1) TW202206363A (zh)

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CN115057064B (zh) * 2022-05-09 2024-04-02 广州南洋电缆集团有限公司 一种剥带装置的控制方法、剥带装置及存储介质

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1318097B1 (de) 2001-12-05 2010-02-24 SSM Schärer Schweiter Mettler AG Verfahren und Vorrichtung zur Regelung der Fadenspannung auf einer Textilmaschine sowie Anwendung des Verfahrens
DE10201118A1 (de) * 2002-01-15 2003-07-24 Neumag Gmbh & Co Kg Verfahren zum Aufwickeln eines Fadens
ATE345303T1 (de) * 2003-10-04 2006-12-15 Ssm Ag Verfahren und vorrichtung zur regelung der fadenspannung auf einer textilmaschine, sowie anwendung des verfahrens
JP2007153554A (ja) 2005-12-06 2007-06-21 Murata Mach Ltd 糸巻取機
CN112739636A (zh) 2018-10-09 2021-04-30 日本Tmt机械株式会社 纱线卷取机以及纱线卷取方法

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TW202206363A (zh) 2022-02-16
JP2022030632A (ja) 2022-02-18
EP3950552A1 (en) 2022-02-09

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