CN107099947A - A kind of take-up lever stroke adjustable structure and sewing machine - Google Patents
A kind of take-up lever stroke adjustable structure and sewing machine Download PDFInfo
- Publication number
- CN107099947A CN107099947A CN201710288633.0A CN201710288633A CN107099947A CN 107099947 A CN107099947 A CN 107099947A CN 201710288633 A CN201710288633 A CN 201710288633A CN 107099947 A CN107099947 A CN 107099947A
- Authority
- CN
- China
- Prior art keywords
- eccentric wheel
- eccentric
- take
- axle
- adjustable structure
- 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
Links
Classifications
-
- D—TEXTILES; PAPER
- D05—SEWING; EMBROIDERING; TUFTING
- D05B—SEWING
- D05B49/00—Take-up devices, e.g. levers, for the needle thread
Landscapes
- Engineering & Computer Science (AREA)
- Textile Engineering (AREA)
- Sewing Machines And Sewing (AREA)
Abstract
The invention belongs to sewing machine technique field, it is related to a kind of take-up lever stroke adjustable structure and sewing machine.Wherein take-up lever stroke adjustable structure includes：Upper axle；It is set in the eccentric wheel I on axle；The eccentric wheel II on eccentric wheel I is set in, and eccentric wheel II can rotate the eccentric size of regulation on eccentric wheel I；Connecting rod is arranged with outside eccentric wheel II；The other end of connecting rod is connected on crank, and crank is arranged on thread taking-up axle；Upper axle rotational band movable eccentric wheel I, eccentric wheel II are rotated, and eccentric wheel II drivening rods move up and down, and the up and down motion of connecting rod is converted into the rotary oscillation of thread taking-up axle by crank.The present invention realizes eccentric size adjustable by using eccentric wheel I and eccentric wheel the II mode being arranged on upper axle, so as to realize the change of thread taking-up axle rotational angle, realize that take-up amount size is adjustable, the elastic of needlework can preferably be adjusted, substantially increase the versatility of sewing machine, use cost is reduced, stitching is optimized.
Description
Technical field
The invention belongs to sewing machine technique field, it is related to a kind of take-up lever stroke adjustable structure and sewing machine.
Background technology
When carrying out sewing work, sewing material has different thickness.In face of the sewing material of different categories, sewing
Great change can occur for thickness, in order to better adapt to different situations, it usually needs pass through special thick material machine or thin material
Machine realizes that this causes machine versatility poor, reduce operating efficiency.
Existing take-up structure is following (as shown in Figure 1)：Include axle 1, eccentric wheel 2, connecting rod are provided with upper axle 1
3 one end is set on eccentric wheel 2, the other end and crank 4 are connected, and the crank 4 is installed on thread taking-up axle 5, in the thread taking-up axle 5
On be additionally provided with and grew line plate.Its operation principle is：Thread taking-up axle 5 is driven to swing by the eccentric wheel 2 on upper axle 1, thread taking-up axle 5
Swing drive and grow line plate swing progress take-up.
Because eccentric size of the eccentric wheel on upper axle is certain, therefore, it can only expect corresponding to the setting of thin material for thick
Eccentric size, with suitable for thickness material and thin material between sew.
The content of the invention
There is provided a kind of take-up lever stroke adjustable structure and sewing for the above mentioned problem existed the present invention be directed to existing technology
Machine, the technical problems to be solved by the invention are：The sewing of thick material how had both been can be suitably used for, the sewing of thin material is can be suitably used for again,
Reduce use cost.
The purpose of the present invention can be realized by following technical proposal：
One of purpose of the present invention is to provide a kind of take-up lever stroke adjustable structure,
A kind of take-up lever stroke adjustable structure, including：Upper axle；
Eccentric wheel I, eccentric wheel I is set on axle；
Eccentric wheel II, eccentric wheel II is set on eccentric wheel I, and eccentric wheel II can rotate regulation partially on eccentric wheel I
Heart size；
Connecting rod, one end of the connecting rod is set in outside eccentric wheel II；
Crank, one end of the crank is arranged on thread taking-up axle, and the other end is connected on the other end of connecting rod；
Upper axle rotational band movable eccentric wheel I, eccentric wheel II are rotated, and eccentric wheel II drivening rods move up and down, above and below connecting rod
Motion is converted into the rotary oscillation of thread taking-up axle by crank.
In a kind of above-mentioned take-up lever stroke adjustable structure, notch is respectively arranged with the eccentric wheel I, eccentric wheel II,
Notch alignment after regulation on eccentric wheel I, eccentric wheel II is set.
In a kind of above-mentioned take-up lever stroke adjustable structure, eccentric wheel II around eccentric wheel I often rotate 180 ° realize thick material with
The switching of the eccentric size of thin material.
In a kind of above-mentioned take-up lever stroke adjustable structure, the eccentric wheel I includes the first main body and is arranged on first
First end plate on main body end face, the first main body and first end plate eccentric setting, have been centrally located axle in first end plate
Hole, the upper shaft hole runs through the first main body.
In a kind of above-mentioned take-up lever stroke adjustable structure, the eccentric throw between first main body and first end plate is
3.25±0.05mm。
In a kind of above-mentioned take-up lever stroke adjustable structure, the eccentric wheel II includes the second main body and is arranged on second
The second end plate on main body end face, the second main body and the second end plate eccentric setting, bias has been centrally located on the second end plate
Wheel bore, the eccentric wheel hole runs through the second main body.
In a kind of above-mentioned take-up lever stroke adjustable structure, the eccentric throw between second main body and the second end plate is
0.25±0.05mm。
In a kind of above-mentioned take-up lever stroke adjustable structure, the eccentric wheel II passes through the screw and eccentric wheel that are radially arranged
I is connected.
In a kind of above-mentioned take-up lever stroke adjustable structure, one end of the connecting rod is arranged on first end plate and the second end plate
Between.
It is a further object to provide a kind of sewing machine, including above-mentioned take-up lever stroke adjustable structure.
Compared with prior art, the present invention has advantages below：
The present invention realizes eccentric size adjustable by using eccentric wheel I and eccentric wheel the II mode being arranged on upper axle, so that
The change of thread taking-up axle rotational angle is realized, realizes that take-up amount size is adjustable, can preferably adjust the elastic of needlework, solve existing
The problem of switching professional machines are needed when thick material is sewed in technology with thin material, substantially increases the versatility of sewing machine, reduces
Use cost, optimizes stitching.
Brief description of the drawings
Fig. 1 is the structural representation of background technology.
Fig. 2 is the structural representation of the present invention.
Fig. 3 is the structural representation that the present invention was provided with line plate.
Fig. 4 is the exploded perspective view of the present invention.
Fig. 5 is the eccentric wheel I of present invention structural representation.
Fig. 6 is the eccentric wheel I of present invention front view.
Fig. 7 is the eccentric wheel II of present invention structural representation.
Fig. 8 is the eccentric wheel II of present invention front view.
In figure, 1, upper axle；2nd, eccentric wheel；3rd, connecting rod；4th, crank；5th, thread taking-up axle；10th, upper axle；20th, eccentric wheel I；201st,
One main body；202nd, first end plate；203rd, upper shaft hole；30th, eccentric wheel II；301st, the second main body；302nd, the second end plate；303rd, it is eccentric
Wheel bore；40th, connecting rod；50th, crank；60th, thread taking-up axle；701st, notch；702nd, notch；703rd, notch；704th, notch；80th, line plate is crossed
Seat；90th, line plate is crossed；100th, line plate pressing plate is crossed.
Embodiment
The following is specific embodiment of the invention and with reference to accompanying drawing, technical scheme is further described,
But the present invention is not limited to these embodiments.
As illustrated in figs. 2 through 8.The present invention provides a kind of take-up lever stroke adjustable structure, including：Upper axle 10, eccentric wheel I 20, partially
Heart wheel II 30, connecting rod 40, crank 50.The eccentric wheel I 20 is set on axle 10, and is fixed by screw；The bias
Wheel II 30 is set on eccentric wheel I 20, and is fixed by screw, and eccentric wheel II 30 can rotate tune on eccentric wheel I 20
The eccentric size of section；Screw is unclamped during regulation, regulation is fixed after finishing by screw.One end of the connecting rod 40 is set in eccentric wheel
Outside II 30；One end of the crank 50 is arranged on thread taking-up axle 60, and the other end is connected on the other end of connecting rod 40.The present invention
Described crank 50 is ball crank.Strip base 80 was provided with thread taking-up axle 60, line plate 90 was provided with strip base is crossed
With crossing line plate pressing plate 100.Wherein, described eccentric wheel II 30 is connected by the screw being radially arranged with eccentric wheel I 20.
The upper rotational band movable eccentric wheel I 20 of axle 10, eccentric wheel II 30 are rotated, and the drivening rods of eccentric wheel II 30 are transported about 40
Dynamic, the up and down motion of connecting rod 40 is converted into the rotary oscillation of thread taking-up axle 60 by crank 50.
The present invention operation principle be：
When needing to sew thin material, eccentric wheel II 30 is rotated, makes the eccentric size between connecting rod 40 and upper axle 10
For small size；
When needing to sew thickness material, eccentric wheel II 30 is rotated, makes the eccentric size between connecting rod 40 and upper axle 10
For large scale.
In order that eccentric wheel II has when rotating is respectively arranged with groove on benchmark, the eccentric wheel I 20, eccentric wheel II 30
Mouthful, the notch alignment after regulation on eccentric wheel I 20, eccentric wheel II 30 is set.
Specific handoff procedure is as follows：Eccentric wheel II 30 often rotates 180 ° around eccentric wheel I 20 and realizes thick material and thin material
The switching of eccentric size.After rotation, the notch alignment on eccentric wheel I 20, eccentric wheel II 30.
Specifically, the eccentric wheel I 20 include the first main body 201 and be arranged on the end face of the first main body 201
End plate 202, the first main body 201 and the eccentric setting of first end plate 202, upper shaft hole has been centrally located in first end plate 202
203, the upper shaft hole 203 runs through the first main body 201.
Correspondingly, notch is located in first end plate 202, and is provided with two, respectively notch 701 and notch 702, along the
End plate 202 is radially arranged.That is, being spaced 180 ° of settings between notch 701 and notch 702.
More specifically, the eccentric throw D1 between first main body 201 and first end plate 202 is 3.25 ± 0.05mm.This
The preferred 3.25mm of embodiment.
Specifically, the eccentric wheel II 30 includes the second main body 301 and is arranged on the end face of the second main body 302
Second end plate 301, the second main body 301 and the plate eccentric setting of the second end 302, eccentric wheel has been centrally located on the second end plate 302
Hole 303, the eccentric wheel hole 303 runs through the second main body 301.
Correspondingly, notch is located on the second end plate 302, and is provided with two, is radially arranged along the second end plate 302.Also
It is to say, 180 ° of settings is spaced between two notches.
More specifically, the eccentric throw D2 between the end plate 302 of the second main body 301 and second is 0.25 ± 0.05mm.This
The preferred 0.25mm of embodiment.
When being currently at small size, when the eccentric size preferably between connecting rod 40 and upper axle 10 is 3mm, eccentric wheel I 20
On two notches 701,702 alignd one by one with two notches 703,704 on eccentric wheel II 30 respectively.
When the eccentric size of regulation is large scale, when preferably the eccentric size between connecting rod 40 and upper axle 10 is 3.5mm, 180 °
The notch 701 rotated on eccentric wheel II 30 to eccentric wheel I 20 aligns with the notch 704 on eccentric wheel II 30, notch 702 and
Notch 703 aligns.Notch is set to improve degree of regulation.The change of eccentric size can directly affect the angle of oscillation of thread taking-up axle 60
Degree, so as to change the stroke of routing, makes it better adapt to different sewing thickness.
Correspondingly, one end of the connecting rod 40 is arranged between the end plate 302 of first end plate 202 and second.First end plate 202
Spacing effect is played to connecting rod 40 with the second end plate 302, it is ensured that the not positioning of connecting rod 40.
The present invention further expands its adjustable extent, makes machine on the basis of existing traditional take-up lever stroke regulation
Device can better adapt to the change of sewing thickness, remain good stitching.
It is a further object to provide a kind of sewing machine, including above-mentioned take-up lever stroke adjustable structure.
Specific embodiment described herein is only to spirit explanation for example of the invention.Technology neck belonging to of the invention
The technical staff in domain can be made various modifications or supplement to described specific embodiment or be replaced using similar mode
Generation, but without departing from the spiritual of the present invention or surmount scope defined in appended claims.
Claims (10)
1. a kind of take-up lever stroke adjustable structure, it is characterised in that：Including：
Upper axle (10)；
Eccentric wheel I (20), eccentric wheel I (20) is set on axle (10)；
Eccentric wheel II (30), eccentric wheel II (30) is set on eccentric wheel I (20), and eccentric wheel II (30) can be in eccentric wheel I
(20) the eccentric size of regulation is rotated on；
Connecting rod (40), one end of the connecting rod (40) is set in eccentric wheel II (30) outside；
Crank (50), one end of the crank (50) is arranged on thread taking-up axle (60), and the other end is connected to the other end of connecting rod (40)
On；
Upper axle (10) rotational band movable eccentric wheel I (20), eccentric wheel II (30) are rotated, above and below eccentric wheel II (30) drivening rod (40)
Motion, the up and down motion of connecting rod (40) is converted into the rotary oscillation of thread taking-up axle (60) by crank (50).
2. a kind of take-up lever stroke adjustable structure according to claim 1, it is characterised in that：The eccentric wheel I (20), bias
Eccentric wheel I (20) after notch, regulation, the notch alignment on eccentric wheel II (30) is respectively arranged with wheel II (30) to set.
3. a kind of take-up lever stroke adjustable structure according to claim 1 or 2, it is characterised in that：Eccentric wheel II (30) is around inclined
Heart wheel I (20) often rotates 180 ° and realizes thick material and the switching of the eccentric size of thin material.
4. a kind of take-up lever stroke adjustable structure according to claim 1, it is characterised in that：The eccentric wheel I (20) includes
The first end plate (202) for having the first main body (201) and being arranged on the first main body (201) end face, the first main body (201) and the
End plate (202) eccentric setting, has been centrally located upper shaft hole (203) in first end plate (202), and the upper shaft hole (203) runs through
First main body (201).
5. a kind of take-up lever stroke adjustable structure according to claim 4, it is characterised in that：First main body (201) with
Eccentric throw between first end plate (202) is 3.25 ± 0.05mm.
6. a kind of take-up lever stroke adjustable structure according to claim 4, it is characterised in that：The eccentric wheel II (30) includes
The second end plate (302) for having the second main body (301) and being arranged on the second main body (301) end face, the second main body (301) and the
Two end plates (302) eccentric setting, has been centrally located eccentric wheel hole (303) on the second end plate (302), the eccentric wheel hole (303)
Through the second main body (301).
7. a kind of take-up lever stroke adjustable structure according to claim 6, it is characterised in that：Second main body (301) with
Eccentric throw between second end plate (302) is 0.25 ± 0.05mm.
8. a kind of take-up lever stroke adjustable structure according to claim 4, it is characterised in that：The eccentric wheel II (30) passes through
The screw being radially arranged is connected with eccentric wheel I (20).
9. a kind of take-up lever stroke adjustable structure according to claim 4 or 8, it is characterised in that：The one of the connecting rod (40)
End is arranged between first end plate (202) and the second end plate (302).
10. a kind of sewing machine, it is characterised in that：Including a kind of take-up lever stroke adjustable structure described in claim any one of 1-9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710288633.0A CN107099947B (en) | 2017-04-27 | 2017-04-27 | Thread take-up stroke adjustable structure and sewing machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710288633.0A CN107099947B (en) | 2017-04-27 | 2017-04-27 | Thread take-up stroke adjustable structure and sewing machine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107099947A true CN107099947A (en) | 2017-08-29 |
| CN107099947B CN107099947B (en) | 2020-05-05 |
Family
ID=59657255
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710288633.0A Active CN107099947B (en) | 2017-04-27 | 2017-04-27 | Thread take-up stroke adjustable structure and sewing machine |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107099947B (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107761271A (en) * | 2017-11-22 | 2018-03-06 | 杰克缝纫机股份有限公司 | A kind of sewing machine and its take-up eccentric |
| CN108060514A (en) * | 2018-01-16 | 2018-05-22 | 杰克缝纫机股份有限公司 | A kind of sewing machine Yarn taking-up mechanism and sewing machine |
| CN108411507A (en) * | 2018-02-08 | 2018-08-17 | 佛山市华连达机械有限公司 | A kind of full-automatic sewing machine |
| CN110952233A (en) * | 2019-12-12 | 2020-04-03 | 东莞理工学院 | Simple adjusting device of thread take-up mechanism of industrial sewing machine |
| CN113397959A (en) * | 2021-07-28 | 2021-09-17 | 黑龙江中医药大学附属第一医院（黑龙江中医药大学第一临床医学院） | Acupuncture-simulated massage rehabilitation physiotherapy device |
| CN114197120A (en) * | 2020-09-18 | 2022-03-18 | 杰克科技股份有限公司 | Thread take-up synchronous adjusting mechanism of flat seaming machine |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61176395A (en) * | 1985-01-29 | 1986-08-08 | フスクバルナ・アクチボラグ | Balance apparatus of sewing machine |
| JPH02119892A (en) * | 1988-10-28 | 1990-05-07 | Juki Corp | Movement adjusting device for thread take-up lever |
| CN1094768A (en) * | 1994-02-08 | 1994-11-09 | 周鹤鸣 | A kind of five lever take-up mechanisms of the confession regulated line amount of use in sewing machine |
| CN201459387U (en) * | 2009-07-14 | 2010-05-12 | 上海富山精密机械科技有限公司 | Mechanism for adjusting wire loop size of industrial multi-needle sewing machine |
| TW201319350A (en) * | 2011-11-14 | 2013-05-16 | Kaulin Mfg Co Ltd | Adjustable stroke of take-up thread and needle rod of sewing machine |
| CN205990521U (en) * | 2016-08-30 | 2017-03-01 | 杰克缝纫机股份有限公司 | A kind of sewing machine Yarn taking-up mechanism |
-
2017
- 2017-04-27 CN CN201710288633.0A patent/CN107099947B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61176395A (en) * | 1985-01-29 | 1986-08-08 | フスクバルナ・アクチボラグ | Balance apparatus of sewing machine |
| JPH02119892A (en) * | 1988-10-28 | 1990-05-07 | Juki Corp | Movement adjusting device for thread take-up lever |
| CN1094768A (en) * | 1994-02-08 | 1994-11-09 | 周鹤鸣 | A kind of five lever take-up mechanisms of the confession regulated line amount of use in sewing machine |
| CN201459387U (en) * | 2009-07-14 | 2010-05-12 | 上海富山精密机械科技有限公司 | Mechanism for adjusting wire loop size of industrial multi-needle sewing machine |
| TW201319350A (en) * | 2011-11-14 | 2013-05-16 | Kaulin Mfg Co Ltd | Adjustable stroke of take-up thread and needle rod of sewing machine |
| CN205990521U (en) * | 2016-08-30 | 2017-03-01 | 杰克缝纫机股份有限公司 | A kind of sewing machine Yarn taking-up mechanism |
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107761271A (en) * | 2017-11-22 | 2018-03-06 | 杰克缝纫机股份有限公司 | A kind of sewing machine and its take-up eccentric |
| CN107761271B (en) * | 2017-11-22 | 2020-10-27 | 杰克缝纫机股份有限公司 | Sewing machine and take-up eccentric device thereof |
| CN108060514A (en) * | 2018-01-16 | 2018-05-22 | 杰克缝纫机股份有限公司 | A kind of sewing machine Yarn taking-up mechanism and sewing machine |
| CN108411507A (en) * | 2018-02-08 | 2018-08-17 | 佛山市华连达机械有限公司 | A kind of full-automatic sewing machine |
| CN110952233A (en) * | 2019-12-12 | 2020-04-03 | 东莞理工学院 | Simple adjusting device of thread take-up mechanism of industrial sewing machine |
| CN110952233B (en) * | 2019-12-12 | 2021-06-04 | 东莞理工学院 | Simple adjusting device of thread take-up mechanism of industrial sewing machine |
| CN114197120A (en) * | 2020-09-18 | 2022-03-18 | 杰克科技股份有限公司 | Thread take-up synchronous adjusting mechanism of flat seaming machine |
| CN114197120B (en) * | 2020-09-18 | 2023-08-11 | 杰克科技股份有限公司 | Thread take-up synchronous regulating mechanism of flat seaming machine |
| CN113397959A (en) * | 2021-07-28 | 2021-09-17 | 黑龙江中医药大学附属第一医院（黑龙江中医药大学第一临床医学院） | Acupuncture-simulated massage rehabilitation physiotherapy device |
| CN113397959B (en) * | 2021-07-28 | 2022-10-14 | 黑龙江中医药大学附属第一医院（黑龙江中医药大学第一临床医学院） | Acupuncture-simulated massage rehabilitation physiotherapy device |
Also Published As
| Publication number | Publication date |
|---|---|
| CN107099947B (en) | 2020-05-05 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN107099947A (en) | A kind of take-up lever stroke adjustable structure and sewing machine | |
| CN207932711U (en) | A kind of automatic collecting device | |
| CN205741518U (en) | A kind of Novel sewing head | |
| CN207143455U (en) | A kind of sewing machine with sewing cloth feeding device | |
| CN207452421U (en) | A kind of use in sewing machine line sending cam | |
| CN106676765A (en) | Synchronous feeding device and sewing machine | |
| CN201546022U (en) | Cloth dragging mechanism of novel cylinder-type transverse feeding sewing machine | |
| CN106012280B (en) | Linking machines transmission system | |
| CN105457847B (en) | A kind of doctor roll rotating mechanism | |
| CN208057874U (en) | A kind of multiple tooth wheel drive mechanism of sewing quilt machine | |
| CN208121328U (en) | A kind of sewing quilt machine gear type driving mechanism | |
| CN207463564U (en) | A kind of New-type electric machine coating machine | |
| CN207787847U (en) | A kind of saw band adjusting apparatus of band sawing machine | |
| CN202317971U (en) | Rotatable jig for pin grinding machines | |
| CN107700081B (en) | Flat seaming machine and cloth feeding mechanism thereof | |
| CN202247307U (en) | Manual rotating shaft adjusting structure on lower shaft in large-specification pattern sewing machine | |
| CN206825632U (en) | A kind of digital controlled ceramic wire bonder | |
| CN205934320U (en) | Linking machine transmission system | |
| CN206467425U (en) | A kind of new sewing machine dust exhaust apparatus interface position governor motion | |
| CN204025224U (en) | Cylinder lifting linkage device | |
| CN204625967U (en) | A kind of supporting arm structure of style outsole stiching machine | |
| CN2675366Y (en) | Single plate longitudinal splicing machine | |
| CN108385285A (en) | A kind of sewing quilt machine gear type driving mechanism | |
| CN203579666U (en) | Manipulator for needle polishing process | |
| CN207883837U (en) | A kind of double end stacking mechanism |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CP03 | Change of name, title or address | ||
| CP03 | Change of name, title or address |
Address after: 318000 no.1008, east section of Donghai Avenue, Sanjia, Jiaojiang District, Taizhou City, Zhejiang Province Patentee after: Jack Technology Co.,Ltd. Address before: 318010 No. 15 Airport South Road, Jiaojiang District, Zhejiang, Taizhou Patentee before: JACK SEWING MACHINE Co.,Ltd. |