EP3176296B1 - Verfahren zum erzeugen eines naht-anfangsoberfadens mit kurzem soll-nahtüberstand - Google Patents

Verfahren zum erzeugen eines naht-anfangsoberfadens mit kurzem soll-nahtüberstand Download PDF

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Publication number
EP3176296B1
EP3176296B1 EP16197995.0A EP16197995A EP3176296B1 EP 3176296 B1 EP3176296 B1 EP 3176296B1 EP 16197995 A EP16197995 A EP 16197995A EP 3176296 B1 EP3176296 B1 EP 3176296B1
Authority
EP
European Patent Office
Prior art keywords
upper thread
seam
thread
initial section
catcher
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
EP16197995.0A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP3176296A1 (de
Inventor
Florian Schulz
Johann Enns
Frank Breder
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.)
Duerkopp Adler AG
Original Assignee
Duerkopp Adler AG
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Duerkopp Adler AG filed Critical Duerkopp Adler AG
Publication of EP3176296A1 publication Critical patent/EP3176296A1/de
Application granted granted Critical
Publication of EP3176296B1 publication Critical patent/EP3176296B1/de
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Classifications

    • D—TEXTILES; PAPER
    • D05—SEWING; EMBROIDERING; TUFTING
    • D05B—SEWING
    • D05B59/00—Applications of bobbin-winding or -changing devices; Indicating or control devices associated therewith
    • D—TEXTILES; PAPER
    • D05—SEWING; EMBROIDERING; TUFTING
    • D05B—SEWING
    • D05B49/00—Take-up devices, e.g. levers, for the needle thread
    • D—TEXTILES; PAPER
    • D05—SEWING; EMBROIDERING; TUFTING
    • D05B—SEWING
    • D05B47/00—Needle-thread tensioning devices; Applications of tensometers
    • D—TEXTILES; PAPER
    • D05—SEWING; EMBROIDERING; TUFTING
    • D05B—SEWING
    • D05B57/00—Loop takers, e.g. loopers
    • D—TEXTILES; PAPER
    • D05—SEWING; EMBROIDERING; TUFTING
    • D05B—SEWING
    • D05B57/00—Loop takers, e.g. loopers
    • D05B57/08—Loop takers, e.g. loopers for lock-stitch sewing machines
    • D—TEXTILES; PAPER
    • D05—SEWING; EMBROIDERING; TUFTING
    • D05B—SEWING
    • D05B65/00—Devices for severing the needle or lower thread

Definitions

  • the invention relates to a method for producing a seam beginning upper thread with a desired seam projection of at most 10 mm.
  • Sewing machines are known from the EP 1 847 641 B1 , the DE 102 34 251 C1 , the DE 10 2006 019 193 A1 and the DE 101 23 075 C1 ,
  • the DE 36 04 299 A1 discloses a method for drawing a free thread end of a needle thread from an upper side of a sewing material on its underside and a device for carrying out the method.
  • the US 2005/0178307 A1 discloses a multi-needle embroidery machine.
  • the DE-PS 80 842 describes a lockstitch gripper sewing machine with free-running gripper.
  • the DE 197 466 53 C1 describes a method for shortening a fabric-side looper thread end in sewing machines with thread cutting device.
  • the EP 1 847 642 A1 describes a lockstitch sewing machine.
  • the EP 2 453 050 A1 describes a sewing machine and a method for sewing a seam beginning with such a sewing machine.
  • the EP 2 692 925 A1 describes a thread-pulling knife for a sewing machine, a thread trimming assembly and a sewing machine with such a thread-pulling knife.
  • the top thread starting section at the beginning of the seam production not only by the fabric down, as for example from the DE 102 34 251 C1
  • the generated Target seam projection can not exceed 9 mm, can not exceed 8 mm, can not exceed 7 mm and can be even smaller.
  • a cutting of the upper thread starting section according to claim 2 generates the low target seam projection immediately.
  • the upper thread catcher clamp may be located adjacent to the upper thread catcher.
  • the upper thread catcher on the one hand and the gripper on the other hand are different sewing machine components.
  • the upper thread catcher clamp can be formed by its own clamping unit, in which the upper thread starting section is controlled by means of the upper thread catcher.
  • Such a clamping unit may be formed directly on the upper thread catcher.
  • the clamp can be formed by two components already present in the sewing machine, between which the upper thread starting section is selectively introduced after being grasped by the upper thread catcher. These clamping components can be on the one hand a bobbin thread and on the other hand a bobbin case.
  • a length specification of the upper thread starting section via an upper thread guide clamp according to claim 4 prevents the upper thread starting section from becoming undesirably too long.
  • the upper thread guide clamp can ensure that the upper thread upper section is actually pulled out by the gripper and that no upper thread from a top thread run between the sewing needle and an upper thread supply is retightened.
  • An adjustment of a Oberfadenauszugs or a Oberfaden arrangement according to claim 6 via a thread tensioning device provides for an adjustable specification of an upper thread guide and processing, which can be used, for example, to adapt to different fabric qualities and / or different yarn qualities.
  • An adjustment of the thread tensioning device may be dependent on the design or the effect of a needle thread catcher clamp. In this way, an interaction of the thread tensioning device can be optimized with the upper thread catcher clamp.
  • the advantages of such an assembly correspond to those already discussed above with reference to the production method of the invention.
  • the gripper and the upper thread catcher can be one and the same component.
  • the gripper and the upper thread catcher may also be formed by separate components.
  • the assembly may include an upper thread knife for cutting off the detected upper thread starting portion.
  • an upper thread knife allows a safe cutting of the detected upper thread starting portion.
  • the upper thread cutter may be a machine component formed as a separate component from another thread-pulling knife for thread cutting at the seam end.
  • the upper thread knife can also be designed as a thread-pulling knife for thread trimming at the seam end.
  • the subassembly may have a suture feed dog, the top thread catcher being mounted on a carrier for the suture feed dog.
  • Such an assembly of the upper thread catcher and in particular of the upper thread diameter ensures that the upper thread starting section can be guided independently of a movement of the conveyor and in particular short cut.
  • the assembly may include an upper thread catcher clamp for clamping the detected upper thread starting portion.
  • the advantages of such an upper thread catcher clamp correspond to those already associated with the catcher clamping step of the production process were explained.
  • the upper thread catcher clamp may be located adjacent to the upper thread catcher. In this case, the upper thread catcher clamp can also be mounted on a carrier for a material feed dog.
  • the upper thread catcher clamp may be formed by the cooperation of a spool and a bobbin case of the sewing machine.
  • the upper thread catcher clamp may be located adjacent to the upper thread catcher. Such an arrangement of the upper thread catcher clamp facilitates controlled guidance of the upper thread starting section.
  • the assembly may include an upper thread guide clamp for specifying a length of the upper thread starting portion located in the upper thread course in front of the sewing needle.
  • the upper thread guide clamp and / or the thread tensioning device can be avoided in particular that the extended upper thread starting section gets so long that it undergoes a knotting with the lower thread when undressing.
  • the module may have a suction device for sucking off the cut upper thread section.
  • a suction device for sucking off the cut upper thread section.
  • a lockstitch sewing machine 1 has a base plate 2 with an upwardly extending therefrom the stand 3 and an angled arm 4. The latter ends in a head 5.
  • an arm shaft 6 is rotatably mounted.
  • This drives in the head 5 a crank mechanism 7 with a thread lever 8 at.
  • the crank mechanism 7 is drivingly connected to a needle bar 9 mounted axially displaceably in the head 5. This has at its lower end a needle 10.
  • the needle 10 is moved up and down by the crank mechanism 7 on a vertical axis 11.
  • a Cartesian xyz coordinate system is used below.
  • the vertical axis 11 extends along the z-direction of this coordinate system.
  • the x-direction is perpendicular to the plane of the Fig. 1 into it and runs parallel to a sewing direction of the sewing machine 1.
  • the y-direction runs in the Fig. 1 to the left.
  • the needle 10 leads in an eye of a coil 12 via a thread tensioning device and the thread lever 8 supplied needle thread 13, which is also referred to as needle thread.
  • the needle thread 13 has a free upper thread starting section 13a.
  • the base plate 2 carries a screw-mounted support plate 14, on which a workpiece 15 rests.
  • the support plate 14 is provided with a recess formed for the passage of a lower feed dog 17.
  • the latter has a tap hole 18 for the passage of the needle 10.
  • the feed dog 17 is in a known manner in drive connection with a arranged below the base plate 2 thrust and screw jack.
  • a gripper 19 having a gripper body 20 with a gripper tip 21.
  • a cup-shaped coil housing 22 for receiving a looper thread supply in the form of a coil 22a is mounted in the gripper body 20 in the gripper body 20, a cup-shaped coil housing 22 for receiving a looper thread supply in the form of a coil 22a is mounted in the gripper body 20, a cup-shaped coil housing 22 for receiving a looper thread supply in the form of a coil 22a is mounted.
  • Upper edge contours on the one hand of the coil housing 22 and on the other hand of the coil 22a are in the schematic representation after Fig. 2 indicated by dashed lines.
  • the looper thread is also called bobbin thread.
  • the gripper 19 is rotatable about a vertical, in the z-direction gripper axis 23.
  • a sewing operation direction of rotation 24 of the gripper body 20 extends in Fig. 3 clockwise about the gripper axis 23.
  • the gripper body 20 is fixedly connected to a shaft 25 which is coaxial with the gripper axis 23.
  • the shaft 25 is rotatably mounted in a bearing block 26 screwed to the base plate 2.
  • a drive shaft 27 is mounted, which is connected to a arranged in the interior of the bearing block 26 gear transmission.
  • the gear transmission has a gear ratio of 1: 2, so that in one revolution of the drive shaft 27 located on the shaft 25 gripper body 20 rotates twice.
  • the drive shaft 27 is drivingly connected to the arm shaft 6 via a belt drive 28.
  • a thread-pulling knife 29 for example, from the EP 1 847 641 B1 is known.
  • the sewing machine 1 For holding and transporting the workpiece part 15, the sewing machine 1 additionally has a presser foot 30 and an upper feed dog 31, which cooperates with the lower feed dog 17 for the material to be transported.
  • the schematic FIG. 2 also shows a course of the upper thread 13 from the spool 12 to the upper thread starting portion 13 a.
  • the upper thread 13 is guided starting from the spool 12 via a thread tensioning device 32 and the thread lever 8 and an upper thread guide clamp 33 toward the needle 10.
  • the upper thread guide clamp 33 has a tension pulley 34 which is fixed to a guide rod 35. Via a compression spring 36, the clamping plate 34 is pulled against a housing-fixed abutment 37 of the upper thread guide clamp 33 for clamping the upper thread 13.
  • abutment 37 At the abutment 37 is an in the Fig. 2 schematically illustrated solenoid 38 attached, which is controlled via a central control device 39 of the sewing machine 1 in a manner not shown.
  • This sewing machine assembly has a top thread catcher 40 for detecting the upper thread 13.
  • the upper thread catcher 40 has at its free end a catch eyelet 41 (see also Fig. 5 ), which also serves as a movable upper thread knife.
  • the free end of the upper thread catcher 40 extends in the in the Fig. 3 shown starting position under the lower feed dog 17, wherein the catch eyelet 41 is aligned with the stitch hole 18.
  • the upper thread catcher 40 has an L-shaped bent base body 42 and is mounted on a pivot bearing 43.
  • the pivot bearing 43 may be fixed to the housing or may alternatively be firmly connected to a feed dog carrier 44 of the lower feed dog 17.
  • the base body 42 of the upper thread catcher 40 By means of the pivot bearing 43, the base body 42 of the upper thread catcher 40 about a pivot axis 45 between the starting position to Fig. 3 and a cutoff end position.
  • Fig. 5 shows an intermediate position of the body 42 between the starting position and the cutting end position.
  • the pivot axis 45 is parallel to the z-direction.
  • the upper thread catcher 40 is actuated by a pneumatic drive, which is not shown in the drawing and which engages an actuating eye 46 in the base body 42, which is spaced from the pivot axis 45 in the base body 42 executed.
  • the Fig. 3 shows the stitch forming tools of the sewing machine 1 in a loop stroke position.
  • the sewing needle 10 has left its bottom dead center and is displaced upward again in the direction of the positive z-axis so far that a needle thread loop 47 has formed.
  • the hook tip 21 engages in the instantaneous position Fig. 3 on.
  • the upper thread catcher 40 is in the starting position, wherein the upper thread loop 47 has formed below the catching eye 41 of the upper thread catcher 40.
  • the upper thread loop 47 represents an upper thread section, which is transported with the sewing needle 10 through the workpiece 15 from the upper side to the lower side thereof.
  • the catch lug 41 is arranged at a very short distance below the lower feed dog 17. This distance is less than 1 mm.
  • the Fig. 2 shows a momentary position of the gripper circulation shortly after the position Fig. 3 ,
  • Fig. 4 shows the current position of the stitch forming tools after a gripper cycle of more than 180 ° compared to Fig. 3 ,
  • the hook tip 21 has pulled the top thread starting portion 13a through the fabric part 15 completely down in this cycle.
  • the upper thread starting section 13a has also the stitch hole 18 and the catch eyelet 41 to pass down.
  • the upper thread 13 extends between the hook tip 21 and the needle hole 18 above the gripper 19 and below the thread pulling knife 29 and passes from below to the fabric initially the catch eyelet 41 and then the stitch hole 18 in the lower feed dog 17.
  • the upper thread starting portion 13a with the gripper 19 so pulled out until the entire upper thread-starting portion 13a is below the fabric underside.
  • the upper thread catcher clamp 33 is closed, so that no upper thread 13 can be tightened from the upper thread supply in the upper thread run before the upper thread catcher clamp 33.
  • the upper thread guide clamp 33 opens.
  • Fig. 5 shows an intermediate position of the main body 42 of the upper thread catcher 40 between the starting position after the Fig. 3 and 4 and the cut-off end position immediately before the cutting of the upper thread starting portion 13a.
  • the upper thread catcher 40 grasps the upper thread 13 via the catch lug 41 for shortening the upper thread starting section 13a.
  • a peripheral edge of the catch 41 acts as a needle thread knife with a housing-fixed counter blade 48 of the assembly for cutting the upper thread 13 together.
  • the needle 10 has left the stitch hole 18 upwards.
  • the upper thread 13 is shortened defined.
  • a free end of the upper thread starting portion 13a is provided on the workpiece 15 at the seam beginning with a length of at most 10 mm.
  • This residual length of the upper thread starting portion 13a may be smaller than 10 mm and may be 9 mm, 8 mm or even 7 mm and may be even smaller.
  • the cutting of the upper thread 13 with the upper thread knife 41 on the counter knife 48 is the end result of guiding the detected upper thread starting portion 13a with the upper thread catcher 40, and presents processing of the upper thread starting portion 13a such that the desired seam projection of the upper thread starting portion 13a is at most 10 mm results.
  • Fig. 6 shows the with the sewing assembly after the Fig. 3 to 5 created seam 48a in a seam beginning section.
  • the sewing direction runs along the x-direction in the Fig. 6 , to the left. Due to the upper thread portion between the upper thread knife 41 and the counter knife 48, the upper thread starting portion 13a at the beginning of the seam 48a is so short that a maximum seam protrusion A of 10 mm results.
  • the module after Fig. 7 has in addition to the one after the Fig. 1 to 5 one in the Fig. 6 shown lifting device 49.
  • the lifting device 49 may be designed as a pneumatic cylinder.
  • the lifting device 49 can be controlled via the central control device 39.
  • the lifting device 49 is disposed between a bottom of the bobbin case 22 and a lower bottom wall of the bobbin 22a.
  • About the lifting device 49 can be a stroke displacement of the coil 22a relative to the coil housing 22 along a displacement path 50 reach, in the Fig. 2 is indicated.
  • a cover wall 51 of the coil 22a projects beyond one of these facing coil receptacles 52 in an upper side of the coil housing 22 by more than 0.5 mm, for example by more than 1 mm.
  • the assembly works Fig. 7 as follows: With regard to the formation of the needle thread loop 47 and the detection of this with the hook tip 21, the assembly operates after Fig. 7 first, as above in connection with the Fig. 1 to 3 described.
  • the lifting device 49 When reaching the current position accordingly Fig. 3 the lifting device 49 is actuated, so that the coil 22a projects beyond the upper edge of the coil housing 22.
  • the hook tip 21 then pulls out the upper thread 13 and pulls the upper thread starting portion 13 a through the workpiece 15 down according to what above in connection with the execution of the Fig. 1 to 5 was explained.
  • the upper thread starting section 13a comes over the bobbin case 22 due to the projection of the lid wall 51 of the bobbin 22a lie between this top wall 51 and the coil housing 22, as in the Fig. 7 shown. In one section, the upper thread 13 is then inside the spool 22a.
  • the lifting device 49 In the instantaneous position of the hook tip 21 after Fig. 7 or in a circulating position of the hook point 21 which is still advanced by about 45 °, the lifting device 49 is transferred to its starting position, so that the coil 22a is lowered again into its normal position in the coil housing 22.
  • the upper thread starting section 13a is then clamped between the spool 22a and the spool housing 22. Through the coil 22a and the coil housing 22, a needle thread catcher clamp is then formed.
  • the upper thread starting portion 13a is progressively pulled out as the seam progresses from the upper thread catcher clamp 22a, 22, wherein the upper thread starting portion 13a as well as that of the Nähgutteil 15 through the stitch hole 18th
  • the upper thread section which has been guided directly from above, is looped around by the lower thread and knotted during seaming.
  • the free beginning of the upper thread starting section 13a may then have a length in the region of the length of a stitch. If the stitch length is set to at most 10 mm, the desired target seam projection of at most 10 mm may result from the upper thread starting portion 13a.
  • Fig. 8 shows a seam 48b, which with the sewing assembly after Fig. 7 is produced.
  • the upper thread starting section 13a is not at the seam beginning of the seam 48b away at the seam 48b, but only between the stitches S i and Si + i. How big i is depends on the length of the upper thread starting portion 13a pulled out from the fabric part 15, which is gradually pulled out of the nip between the bobbin 22a and the bobbin case 22 during sewing. i can be in the range between 4 and 10, for example. Even at the seam 48b, the seam projection A of the upper thread starting portion 13a is at most 10 mm.
  • the upper thread guide clamp 33 can be omitted.
  • a desired ratio of a length dimension of the upper thread 13 drawn from the upper thread starting portion 13a and one of the upper thread running becomes when the upper thread starting portion 13a is extended and / or guided before the sewing needle 10 pulled length measure of the upper thread 13 results.
  • the more the thread tension is adjusted the larger the proportion of the length dimension drawn from the upper thread starting section 13a in comparison with the length dimension of the upper thread 13 provided by the thread tensioning device 32.
  • the sewing assembly can also have one in the Fig. 5 schematically indicated suction device 53 for sucking off the cut with the upper thread cutter 41 upper thread portion.
  • the suction device 53 is arranged adjacent to the cutting edge of the counter blade 48.
  • the suction device 53 is connected to a vacuum source.
  • the upper thread catcher 40 with the catch eyelet 41 can in a further variant of a sewing assembly for producing a seam beginning upper thread with a nominal seam projection of at most 10 mm even without a counter knife are used.
  • the upper thread catcher 40 then cooperates with an upper thread catcher clamp in the manner of the above-described clamping between the coil 22a and the coil housing 22 together.
  • This upper thread catcher clamp may be disposed adjacent to the upper thread catcher 40.
  • the upper thread starting portion 13a is not cut off but sewed in a controlled manner with the seam starting portion sewn, as described above in connection with FIGS. 7 and 8 already explained.
  • this sewing operation it can be achieved by synchronously moving the catching eyelet 41 for seaming in the +/- y direction that the upper thread starting section 13a is gradually pulled out of the upper thread catcher clip to the right (-y direction) and to the left ( + y-direction) is placed in the stitch hole so that it is always placed under the respective stitch and sewn under.
  • the side of the stitch hole 18, over which the upper thread starting section 13a is guided during sewing of the initial seam section can be designed to be straight, ie not curved his.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Sewing Machines And Sewing (AREA)
EP16197995.0A 2015-11-24 2016-11-09 Verfahren zum erzeugen eines naht-anfangsoberfadens mit kurzem soll-nahtüberstand Active EP3176296B1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102015223194.1A DE102015223194B3 (de) 2015-11-24 2015-11-24 Verfahren zum Erzeugen eines Naht-Anfangsoberfadens mit kurzem Soll-Nahtüberstand sowie Baugruppe zur Durchführung des Verfahrens

Publications (2)

Publication Number Publication Date
EP3176296A1 EP3176296A1 (de) 2017-06-07
EP3176296B1 true EP3176296B1 (de) 2019-08-21

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EP16197995.0A Active EP3176296B1 (de) 2015-11-24 2016-11-09 Verfahren zum erzeugen eines naht-anfangsoberfadens mit kurzem soll-nahtüberstand

Country Status (6)

Country Link
EP (1) EP3176296B1 (enExample)
JP (1) JP6975533B2 (enExample)
KR (1) KR102557765B1 (enExample)
CN (1) CN106757847B (enExample)
DE (1) DE102015223194B3 (enExample)
TW (1) TWI753871B (enExample)

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Publication number Priority date Publication date Assignee Title
DE102017207627A1 (de) * 2017-05-05 2018-11-08 Dürkopp Adler AG Baugruppe zum Erzeugen eines Naht-Anfangsoberfadens mit einem Soll-Nahtüberstand
DE102017207626A1 (de) * 2017-05-05 2018-11-08 Dürkopp Adler AG Verfahren zum Erzeugen eines Naht-Endunterfadens mit vorgegebenem Soll-Nahtüberstand
CN109402885A (zh) * 2018-11-28 2019-03-01 杰克缝纫机股份有限公司 缝纫机用的挑线机构及缝纫机
CN109457409A (zh) * 2018-11-28 2019-03-12 杰克缝纫机股份有限公司 缝纫机用的挑线机构及缝纫机
CN117661201B (zh) * 2022-09-01 2025-11-21 拓卡奔马机电科技有限公司 一种面线夹持剪线装置及缝纫机

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JP2002113278A (ja) * 2000-10-10 2002-04-16 Juki Corp ミシンの糸切り装置
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JP4037151B2 (ja) * 2002-04-10 2008-01-23 Ｊｕｋｉ株式会社 ミシンの上糸保持装置
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DE202006009410U1 (de) * 2006-04-21 2007-08-30 Dürkopp Adler AG Fadenziehmesser für eine Nähmaschine
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JP5885018B2 (ja) * 2011-09-13 2016-03-15 ヤマトミシン製造株式会社 二重環縫いの縫目のほつれ止め方法及び二重環縫いミシンの縫目のほつれ止め装置
DE102012213599A1 (de) * 2012-08-01 2014-02-06 Dürkopp Adler AG Fadenziehmesser für eine Nähmaschine, Fadenabschneid-Baugruppe sowie Nähmaschine mit einem derartigen Fadenziehmesser

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Publication number Publication date
TWI753871B (zh) 2022-02-01
JP2017099875A (ja) 2017-06-08
KR102557765B1 (ko) 2023-07-19
CN106757847B (zh) 2020-09-08
EP3176296A1 (de) 2017-06-07
DE102015223194B3 (de) 2017-02-23
KR20170060590A (ko) 2017-06-01
JP6975533B2 (ja) 2021-12-01
CN106757847A (zh) 2017-05-31
TW201726999A (zh) 2017-08-01

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