EP3753887A1 - Dispositif de réglage de tension de fil - Google Patents

Dispositif de réglage de tension de fil Download PDF

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Publication number
EP3753887A1
EP3753887A1 EP20180365.7A EP20180365A EP3753887A1 EP 3753887 A1 EP3753887 A1 EP 3753887A1 EP 20180365 A EP20180365 A EP 20180365A EP 3753887 A1 EP3753887 A1 EP 3753887A1
Authority
EP
European Patent Office
Prior art keywords
yarn
adjusting device
tension adjusting
disk
opposing
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.)
Granted
Application number
EP20180365.7A
Other languages
German (de)
English (en)
Other versions
EP3753887B1 (fr
Inventor
Takaki SHIBAMOTO
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.)
Shima Seiki Mfg Ltd
Original Assignee
Shima Seiki Mfg Ltd
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Filing date
Publication date
Application filed by Shima Seiki Mfg Ltd filed Critical Shima Seiki Mfg Ltd
Publication of EP3753887A1 publication Critical patent/EP3753887A1/fr
Application granted granted Critical
Publication of EP3753887B1 publication Critical patent/EP3753887B1/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • B65H59/10—Adjusting or controlling tension in filamentary material, e.g. for preventing snarling; Applications of tension indicators by devices acting on running material and not associated with supply or take-up devices
    • B65H59/20—Co-operating surfaces mounted for relative movement
    • B65H59/22—Co-operating surfaces mounted for relative movement and arranged to apply pressure to material
    • B65H59/225—Tension discs
    • D—TEXTILES; PAPER
    • D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
    • D04B—KNITTING
    • D04B15/00—Details of, or auxiliary devices incorporated in, weft knitting machines, restricted to machines of this kind
    • D04B15/38—Devices for supplying, feeding, or guiding threads to needles
    • D04B15/44—Tensioning devices for individual threads
    • D—TEXTILES; PAPER
    • D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
    • D04B—KNITTING
    • D04B37/00—Auxiliary apparatus or devices for use with knitting machines
    • D04B37/02—Auxiliary apparatus or devices for use with knitting machines with weft knitting machines
    • 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 tension adjusting device that adjusts tension exerted on a yarn held between opposing surfaces opposing each other.
  • a yarn tension adjusting device of this type may generally be installed in a top tension device of a flat knitting machine to prevent excessive pullout of a yarn from a yarn cone.
  • the yarn tension adjusting device exerts appropriate tension on a yarn held between opposing surfaces opposing each other.
  • a first one of the opposing surfaces is movable toward or away from a second one of the opposing surfaces, and constantly urged toward the second one of the opposing surfaces by a coil spring disposed on the first one of the opposing surfaces.
  • the coil spring includes a screw member screwed on an end of a shaft extending in an expansion/contraction direction.
  • the screw member When the screw member has its length in the expansion/contraction direction changed by being fastened or unfastened, the urging force of the first one of the opposing surfaces exerted on the second one of the opposing surfaces is increased or decreased to adjust tension exerted on a yarn between opposing surfaces.
  • a yarn tension adjusting device of this type known thus far include a device that adjusts tension exerted on a needle yarn on a yarn feed path of a sewing machine along which the needle yarn is fed from a yarn spool to a needle (see Japanese Unexamined Patent Application Publication No. 2002-210279 ).
  • This yarn tension adjusting device includes a coil spring constantly urging the first one of the opposing surfaces opposing each other toward the second one of the opposing surfaces, and a plunger that presses with an electromagnetic solenoid. Adding the pressing force of the plunger to the urging force of the coil spring allows the pressing force not being fulfilled by the urging force of the coil spring to be exerted on the second one of the opposing surfaces, to adjust tension of the needle yarn over a wide range.
  • the existing yarn tension adjusting device fails to decrease the urging force of the urging means.
  • the existing yarn tension adjusting device needs to additionally have a mechanism including a plunger that moves the first one of the opposing surfaces in a direction away from the second one of the opposing surfaces by pushing it with an electromagnetic solenoid.
  • the present invention has been made in view of the above circumstances, and an object of the present invention is to provide a yarn tension adjusting device that can move a first one of opposing surfaces toward or away from a second one of the opposing surfaces to increase or decrease urging force of urging means without using two mechanisms each including an electromagnetic solenoid and a plunger to reduce the cost while avoiding size increase of the device.
  • the present invention is to provide a yarn tension adjusting device including a yarn tension adjusting device body that adjusts tension exerted on a yarn held between opposing surfaces opposing each other.
  • a first opposing surface of the opposing surfaces is movable toward or away from a second opposing surface of the opposing surfaces.
  • a permanent magnet is disposed at the first opposing surface, and an electromagnet coupled to a power source to be capable of changing a magnetic pole and electric current is disposed at the second opposing surface.
  • Urging means for constantly and elastically urging the first opposing surface toward the second opposing surface is disposed at the first opposing surface.
  • the urging means may include urging force changing means for changing urging force of the urging means.
  • the urging force changing means may change urging force of the urging means with electric means using electricity.
  • the yarn tension adjusting device body may be installed in a top tension device of a flat knitting machine.
  • the permanent magnet is disposed at the first opposing surface, which opposes the second opposing surface with the yarn interposed therebetween, and the urging means for constantly urging the first opposing surface toward the second opposing surface is disposed, whereas the electromagnet that can change the magnetic pole is disposed at the second opposing surface.
  • changing the magnetic pole of the electromagnet obtains attraction force and repulsive force with respect to the polarity of the permanent magnet.
  • the urging force of the urging means is increased by the attraction force caused when the magnetic pole of the electromagnet is changed to the polarity different from that of the permanent magnet, whereas it is decreased by the repulsive force caused when the magnetic pole of the electromagnet is changed to the polarity the same as that of the permanent magnet.
  • the permanent magnet and the urging means at the first one of the opposing surfaces, and the electromagnet, at the second one of the opposing surfaces, capable of changing the magnetic pole and the electric current form a yarn tension adjusting device.
  • two-direction movement of a first one of opposing surfaces toward or away from a second one of the opposing surfaces to increase or decrease urging force of urging means is performed by switching between attraction force and repulsive force with the change of the magnetic pole of the electromagnet and depending on the size of the attraction force and the repulsive force corresponding to the electric current to the electromagnet.
  • This structure eliminates the need of using two mechanisms each including an electromagnetic solenoid and a plunger.
  • the size increase of the yarn tension adjusting device is suppressed, and the cost can be reduced.
  • the urging force of the urging means enables exertion of certain tension on the yarn held between the opposing surfaces without depending on the magnetic force. This structure can thus reduce power consumption.
  • the first one of the opposing surfaces that moves toward or away from the second one of the opposing surfaces while including the urging means is lighter in weight than the second one of the opposing surfaces that has the electromagnet mounted thereon.
  • the mechanism that increases or decreases the urging force of the urging means is light in weight. The first one of the opposing surfaces can thus quickly respond in accordance with attraction force and repulsive force caused by changing the magnetic pole and the electric current of the electromagnet.
  • the urging means may include urging force changing means for changing the urging force.
  • the urging force can be changed without depending on the magnetic force between the permanent magnet and the electromagnet, so that tension can be exerted on the yarn as intended.
  • This structure is preferable for uniform tension control or for controlling tension exerted at intended timing with reference to the urging force of the urging means, and thus can further reduce power consumption.
  • the urging force changing means includes electric means for electrically changing the urging force of the urging means
  • the urging force of the urging means of each yarn tension adjusting device can be electrically changed, which can eliminate manual operations performed to change the urging force of the urging means.
  • changing of the urging force of the urging means with the electric means is performed on the basis of the tension value detected by a tension sensor.
  • the thread tension can be monitored with a tension sensor, so that tension changes due to external causes such as accumulation of yarn dust can be also managed.
  • the yarn tension adjusting device body may be installed in the top tension device.
  • the yarn tension adjusting device body can be readily installed in each top tension device around which is relatively spacious, instead of an existing yarn tension adjusting device that urges the opposing surfaces with only the urging force of the urging means.
  • Fig. 1 is a perspective view of a top tension device including a yarn tension adjusting device according to an embodiment of the present invention.
  • Multiple top tension devices 1 each illustrated in Fig. 1 are installed in a flat knitting machine, not illustrated.
  • Each top tension device 1 includes a yarn tension adjusting device 2.
  • Each yarn tension adjusting device 2 individually adjusts tension exerted on a yarn Y pulled out from a yarn package.
  • Each yarn tension adjusting device 2 is attached to a base end (upstream side of the yarn feed path) of a frame 10 of the top tension device 1.
  • the top tension device 1 also includes a tension arm 11, which extends toward the tip, above the frame 10.
  • Reference signs 12 to 17 denote yarn guide portions that allow the yarn Y to be inserted therethrough to guide the yarn Y.
  • the yarn guide portion 13 is disposed at the tip of an arm that swings in an up-down direction as a rotation shaft around the base end of the frame 10.
  • Fig. 2 is a perspective view of the yarn tension adjusting device 2 illustrated in Fig. 1
  • Fig. 3 is a sectional view of the yarn tension adjusting device 2 illustrated in Fig. 2
  • the yarn tension adjusting device 2 includes a yarn tension adjusting device body 20, which exerts tension on a yarn Y held between opposing surfaces 211 and 221 of first and second disks 21 and 22 opposing each other for adjustment.
  • the first and second disks 21 and 22 are disposed on the same shaft 23, and the second disk 22 of both disks 21 and 22 is fixed to a second end (right end in Fig. 3 ) of the shaft 23.
  • the first disk 21 is movable on the shaft 23. Specifically, the first disk 21 is disposed on the shaft 23 so that the opposing surface 211 (first one of the opposing surfaces) is movable toward or away from the opposing surface 221 (second one of the opposing surfaces) of the second disk 22.
  • a substantially annular permanent magnet 24 is disposed on the surface of the first disk 21 opposite to the opposing surface 211.
  • an electromagnet 25 is disposed on the surface of the second disk 22 opposite to the opposing surface 221.
  • the electromagnet 25 is coupled to a power source, not illustrated, via a converter (not illustrated) that changes the current direction and the electric current to be capable of changing the magnetic pole and the electric current. These changes are controlled by a controller of the flat knitting machine, not illustrated.
  • the electromagnet 25 includes an iron core 251 and a coil 252, wound around the iron core 251.
  • the opposing surface 221 of the second disk 22 is a magnetic pole surface.
  • the first and second disks 21 and 22 are formed from a nonmagnetic material such as stainless steel.
  • the shaft 23 has its second end fitted on the iron core 251.
  • the shaft 23 has a substantially circular insertion hole 231 at a portion between the opposing surfaces 211 and 221 of the first and second disks 21 and 22.
  • the insertion hole 231 has a communication groove 232 communicating with the outside. Tension is exerted on the yarn Y inserted through the insertion hole 231 via the communication groove 232, between the opposing surfaces 211 and 221 of the first and second disks 21 and 22.
  • the coil spring 27 is contracted between a screw member 28, which is screwed on a first end (left end in Fig. 3 ) of the shaft 23, and the surface of the first disk 21 opposite to the opposing surface 211 while having its expansion/contraction direction aligned with the shaft 23.
  • the screw member 28 has a function of urging force changing means for moving on the shaft 23 in the expansion/contraction direction of the coil spring 27 with a manual fastening/unfastening operation (change operation) to change the urging force of the coil spring 27.
  • the permanent magnet 24 is disposed on the first disk 21, which opposes the second disk 22 with the yarn Y interposed therebetween, and the coil spring 27 is provided that constantly urges the opposing surface 211 of the first disk 21 toward the opposing surface 221 of the second disk 22, whereas the electromagnet 25 that can change the magnetic pole is disposed on the second disk 22.
  • changing the magnetic pole of the electromagnet 25 with a converter obtains attraction force and repulsive force with respect to the polarity of the permanent magnet 24.
  • the electromagnet 25 is coupled to the power source to be capable of changing the electric current.
  • the attraction force and repulsive force with respect to the permanent magnet 24 can be changeable in accordance with the electric current.
  • the urging force of the coil spring 27 is increased with the attraction force that occurs when the magnetic pole of the electromagnet 25 is changed to the polarity different from that of the permanent magnet 24, whereas it is decreased by the repulsive force that occurs when the magnetic pole of the electromagnet 25 is changed to the polarity the same as that of the permanent magnet 24.
  • the permanent magnet 24 and the coil spring 27 on the first disk 21, and the electromagnet 25, on the second disk 22, capable of changing the magnetic pole and the electric current form the yarn tension adjusting device 2.
  • the urging force of the coil spring 27 enables exertion of certain tension on the yarn Y held between the opposing surfaces 211 and 221 of the first and second disks 21 and 22 without depending on the magnetic force.
  • This structure eliminates the need of constant power feed to the electromagnet 25, and thus can reduce power consumption.
  • the first disk 21 that moves with the coil spring 27 toward or away from the opposing surface 221 of the second disk 22 is lighter in weight than the second disk 22 that has the electromagnet 25 mounted thereon.
  • the mechanism that increases or decreases the urging force of the coil spring 27 is light in weight.
  • the first disk 21 can quickly respond in accordance with attraction force and repulsive force caused by changing the magnetic pole of the electromagnet 25.
  • the screw member 28 that contracts the coil spring 27 between itself and the first disk 21 functions as urging force changing means for changing the urging force of the coil spring 27 by being fastened and unfastened.
  • the urging force can be changed without depending on the magnetic force between the permanent magnet 24 and the electromagnet 25, so that tension can be exerted on the yarn Y as intended.
  • This structure is preferable for uniform tension control or for controlling tension exerted at intended timing with reference to the urging force of the coil spring 27, and thus can further reduce power consumption.
  • the yarn tension adjusting device body 20 is installed in the top tension device 1 of a flat knitting machine.
  • the yarn tension adjusting device body 20 can be readily installed in each top tension device 1 on the upper portion that is more spacious than the portion, such as the side surface of the flat knitting machine, where multiple side tensioners form a cluster of a large number of yarn feed paths, instead of an existing yarn tension adjusting device that urges the opposing surfaces with only the urging force of the urging means.
  • the screw member 28 is manually fastened or unfastened to change the urging force of the coil spring 27.
  • the screw member may be electrically fastened or unfastened by electric means such as a motor.
  • the urging force of the coil spring of each yarn tension adjusting device can be electrically changed, which can eliminate manual fastening/unfastening operations performed on the screw member.
  • the urging force of the coil spring is changed by the electric means on the basis of the value of tension detected by a tension sensor.
  • the thread tension can be monitored with a tension sensor, so that tension changes due to external causes such as accumulation of yarn dust can be also managed.
  • the urging force of the coil spring is changed by fastening or unfastening the screw member in accordance with the rotation rate of a motor at the timing before knitting with the flat knitting machine, not during knitting.
  • a quick tension control such as that required during knitting, is not required, so that a compact inexpensive motor is used.
  • the coil spring 27 is used as the urging means.
  • an N-shaped or M-shaped flat spring may be used as the urging means, and such a flat spring may be contracted between the screw member at the first end of the shaft and the surface of the first disk opposite to the opposing surface.
  • the yarn tension adjusting device 2 is installed in the top tension device 1 of a flat knitting machine.
  • the yarn tension adjusting device 2 may be installed anywhere, not to mention on the side surface of a flat knitting machine while bypassing the side tensioners on a yarn feed path along which a yarn pulled out from a yarn package is fed to a knitting needle.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Knitting Machines (AREA)
  • Sewing Machines And Sewing (AREA)
EP20180365.7A 2019-06-18 2020-06-16 Dispositif de réglage de tension de fil Active EP3753887B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2019112448A JP2020204106A (ja) 2019-06-18 2019-06-18 糸張力調整装置

Publications (2)

Publication Number Publication Date
EP3753887A1 true EP3753887A1 (fr) 2020-12-23
EP3753887B1 EP3753887B1 (fr) 2023-03-15

Family

ID=71105291

Family Applications (1)

Application Number Title Priority Date Filing Date
EP20180365.7A Active EP3753887B1 (fr) 2019-06-18 2020-06-16 Dispositif de réglage de tension de fil

Country Status (4)

Country Link
EP (1) EP3753887B1 (fr)
JP (1) JP2020204106A (fr)
KR (1) KR102393164B1 (fr)
CN (1) CN112095216B (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP4101965A1 (fr) * 2021-06-11 2022-12-14 KARL MAYER STOLL R&D GmbH Frein de fils

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR102563089B1 (ko) * 2021-12-17 2023-08-04 주식회사 펌프킨 컨택트바 스프링 장력 조절장치

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19538138A1 (de) * 1995-10-13 1997-07-03 Beck Textilmaschinen Fadenbremse
GB2325246A (en) * 1997-05-16 1998-11-18 Sipra Patent Beteiligung Yarn tensioner
WO1999028228A1 (fr) * 1997-12-03 1999-06-10 Iro Patent Ag Tendeur de fil
JP2002210279A (ja) 2001-01-19 2002-07-30 Brother Ind Ltd ミシンの糸調子装置
CN1517465A (zh) * 2003-01-09 2004-08-04 陈仁惠 压纱器的结构改良
WO2006074674A1 (fr) * 2004-12-23 2006-07-20 Memminger-Iro Gmbh Tendeur de fil a force de freinage reglable

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3232813A1 (de) * 1982-08-26 1984-03-08 Tokyo Juki Industrial Co., Ltd., Tokyo Verfahren zum steuern des oberen fadens in einer naehmaschine
CN1045479C (zh) * 1991-03-26 1999-10-06 Iro有限公司 纱线制动装置
JPH0568764A (ja) * 1991-09-13 1993-03-23 Juki Corp ミシンの下糸制御装置
JPH06170074A (ja) * 1992-10-08 1994-06-21 Tokai Ind Sewing Mach Co Ltd 刺繍ミシンの上糸テンション制御装置
JPH0770878A (ja) * 1993-09-03 1995-03-14 Tagawa Kikai Kk 糸把持装置及び流体噴射織機
JP2008023047A (ja) * 2006-07-20 2008-02-07 Juki Corp 下糸張力制御装置
JP2008119078A (ja) * 2006-11-09 2008-05-29 Juki Corp ミシンの下糸張力制御装置
WO2010147023A1 (fr) * 2009-06-16 2010-12-23 エヌエスディ株式会社 Dispositif de commande de tension de fil inférieur pour machine à coudre, et machine à coudre

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19538138A1 (de) * 1995-10-13 1997-07-03 Beck Textilmaschinen Fadenbremse
GB2325246A (en) * 1997-05-16 1998-11-18 Sipra Patent Beteiligung Yarn tensioner
WO1999028228A1 (fr) * 1997-12-03 1999-06-10 Iro Patent Ag Tendeur de fil
JP2002210279A (ja) 2001-01-19 2002-07-30 Brother Ind Ltd ミシンの糸調子装置
CN1517465A (zh) * 2003-01-09 2004-08-04 陈仁惠 压纱器的结构改良
WO2006074674A1 (fr) * 2004-12-23 2006-07-20 Memminger-Iro Gmbh Tendeur de fil a force de freinage reglable

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP4101965A1 (fr) * 2021-06-11 2022-12-14 KARL MAYER STOLL R&D GmbH Frein de fils

Also Published As

Publication number Publication date
KR20200144485A (ko) 2020-12-29
CN112095216B (zh) 2022-08-09
CN112095216A (zh) 2020-12-18
EP3753887B1 (fr) 2023-03-15
JP2020204106A (ja) 2020-12-24
KR102393164B1 (ko) 2022-04-29

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