CN107338548B - Collective tension adjusting device - Google Patents
Collective tension adjusting device Download PDFInfo
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- CN107338548B CN107338548B CN201710450709.5A CN201710450709A CN107338548B CN 107338548 B CN107338548 B CN 107338548B CN 201710450709 A CN201710450709 A CN 201710450709A CN 107338548 B CN107338548 B CN 107338548B
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- tension
- sheet
- tension device
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- D—TEXTILES; PAPER
- D02—YARNS; MECHANICAL FINISHING OF YARNS OR ROPES; WARPING OR BEAMING
- D02H—WARPING, BEAMING OR LEASING
- D02H13/00—Details of machines of the preceding groups
- D02H13/22—Tensioning devices
- D02H13/26—Tensioning devices for threads in warp form
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- Engineering & Computer Science (AREA)
- Textile Engineering (AREA)
- Tension Adjustment In Filamentary Materials (AREA)
Abstract
The invention relates to a tension device for collective adjustment, which comprises an upper tensioner longitudinal beam and a lower tensioner longitudinal beam (8), wherein a plurality of tension device units (9) are arranged between the upper tensioner longitudinal beam and the lower tensioner longitudinal beam (8) in parallel, each tension device unit (9) comprises a tension device upright column (9.1), a row of fixed tension devices (9.2) are arranged on the front side of each tension device upright column (9.1), a first connecting rod (9.3) capable of sliding up and down is arranged on the left side of each row of fixed tension devices (9.2), a row of movable tension devices (9.4) are arranged on each first connecting rod (9.3), a row of yarn guide porcelain eyes (9.5) are arranged on the left side and the right side of each tension device upright column (9.1), and the yarn guide porcelain eyes (9.5) on the left side and the right side correspond to the fixed tension devices (9.2) one by one and are positioned on the same horizontal line. According to the tension device for collective adjustment, all the tensioners on the bobbin creel can be collectively adjusted, so that the labor intensity of operators is reduced, and the working efficiency is improved.
Description
Technical Field
The invention relates to a tension device for collective adjustment, and belongs to the technical field of textile machinery.
Background
When tension is adjusted by a traditional tensioner for a bobbin creel of a warping machine, yarn tension needs to be adjusted singly, and the required warping tension is different due to different yarn varieties, so that the tensioner for the bobbin creel needs to be adjusted, and an operator needs to continuously adjust the yarn tension of the tensioner according to the yarn varieties, so that the requirement of a warping process is met. Now, the general bobbin cradle tensioner is configured to be about 800 heads, and an operator needs a lot of time to adjust 800 tensioners one by one. The types of the yarns are different, and the selected tensioner forms are also different, for example, a two-column type or three-column type tensioner is generally adopted for short fiber yarns; the long polyester fiber yarns generally adopt a ring type tensioner, and the traditional tensioner cannot meet the requirements of various yarns.
Disclosure of Invention
The invention aims to solve the technical problem of providing a tension collectively adjusting device aiming at the prior art, all tensioners on a bobbin creel can be collectively adjusted, the labor intensity of operators is reduced, the working efficiency is improved, the tension collectively adjusting device can be suitable for various yarns, and the tension adjusting range of the yarns is wide.
The technical scheme adopted by the invention for solving the problems is as follows: the utility model provides an collective regulation tension device, it includes two upper and lower tensioner longerons, and parallel arrangement has a plurality of tension device units between two upper and lower tensioner longerons, the tension device unit includes the tension device stand, the tension device stand front side is provided with a fixed tension device along vertical direction, a fixed tension device left side is provided with one can follow the first connecting rod of vertical direction gliding from top to bottom, be provided with a portable tension device along vertical direction on the first connecting rod, the tension device stand left and right sides all is provided with a yarn porcelain eye of leading, it just is located same water flat line with fixed tension device one-to-one to lead yarn porcelain eye.
The fixed tension device comprises a first fixing seat, the first fixing seat is fixedly arranged on a tension device stand column, a magnet mounting seat capable of moving in the front-back direction is arranged on the first fixing seat, a first magnet is arranged at the front end of the magnet mounting seat, a first mandrel is arranged at the front end of the first fixing seat, a first rear tension sheet and a first front tension sheet are arranged on the first mandrel, the first rear tension sheet and the first front tension sheet are installed on the first fixing seat through a first fixing nut, a second magnet is arranged between the first rear tension sheet and the first fixing seat, and a yarn guide porcelain hook is arranged between the first rear tension sheet and the first front tension sheet.
The fixed tension device comprises a first fixing seat, the first fixing seat is fixedly arranged on a tension device stand column, a magnet mounting seat capable of moving in the front-back direction is arranged on the first fixing seat, a first magnet is arranged at the front end of the magnet mounting seat, a first mandrel is arranged at the front end of the first fixing seat, a first rear tension sheet and a first front tension sheet are arranged on the first mandrel, the first rear tension sheet and the first front tension sheet are installed on the first fixing seat through a first fixing nut, a second magnet is arranged between the first fixing nut and the first front tension sheet, and a yarn guide porcelain hook is arranged between the first rear tension sheet and the first front tension sheet.
The tension device is characterized in that a second connecting rod capable of sliding up and down along the vertical direction is arranged in the tension device stand column, a plurality of guide grooves are formed in the second connecting rod, the guide grooves are arranged in an inclined mode, a guide pin is arranged at the rear end of the magnet mounting seat, and the guide pin is clamped in the guide grooves.
The movable tension device comprises a connection flat iron, the connection flat iron is fixedly connected with a first connecting rod, a second fixing seat is arranged on the front side of the connection flat iron, a second mandrel is arranged at the center of the second fixing seat, a second rear tension sheet and a second front tension sheet are arranged on the second mandrel, the second rear tension sheet and the second front tension sheet are fixedly installed on the second fixing seat through a second fixing bolt, and a spring is arranged between the second rear tension sheet and the second fixing seat.
There are first transmission shaft and second transmission shaft along fore-and-aft direction parallel arrangement on the tensioner longeron of upside, be provided with first gear motor and second gear motor on the slide of front side or rear side, first gear motor and second gear motor are used for driving first transmission shaft and second transmission shaft respectively, all be provided with a plurality of drive gear boxes on first transmission shaft and the second transmission shaft, set up drive screw in the drive gear box, first connecting rod and second connecting rod upper end all are provided with drive nut, drive screw in the drive gear box on first transmission shaft and the second transmission shaft is used for driving drive nut on first connecting rod and the second connecting rod respectively to drive first connecting rod and second connecting rod up-and-down motion.
Both sides all are provided with the board that slides around the tensioner longeron of upside, be provided with the roller train that slides on the board that slides.
And linear displacement sensors are arranged on the tension device columns above the row of movable tension devices.
The collective tension adjusting device is arranged on a bobbin creel cross beam of the bobbin creel frame and can move left and right along the bobbin creel cross beam.
Compared with the prior art, the invention has the advantages that:
the tension device can adapt to various yarns, has a wide yarn tension adjusting range, can automatically control the yarn tension through the control unit of the device, meets the yarn tension requirements of different stages of warping starting, running and stopping, can be collectively adjusted by all the tensioners on the bobbin creel, reduces the labor intensity of operators and improves the working efficiency.
Drawings
Fig. 1 is a schematic view of the installation position of a collective adjustment tension device of the invention.
Fig. 2 is a schematic structural diagram of a collective adjustment tension device of the invention.
Fig. 3 is a schematic structural view of the tension device unit in fig. 2.
Fig. 4 is a schematic structural view of the fixed tension device in fig. 3.
Fig. 5 is a schematic structural view of another embodiment of the fixed tension device in fig. 3.
Fig. 6 is a schematic diagram of tension adjustment of the fixed tension device of fig. 3.
Fig. 7 is a schematic structural view of the mobile tension device of fig. 3.
Fig. 8 is a schematic view of tension adjustment of the mobile tension device of fig. 3.
Wherein:
Collective adjustment tension device 2
Bobbin creel beam 3
First reduction motor 4
Second reduction motor 5
First transmission shaft 6
Tensioner longitudinal beam 8
Tension device upright column 9.1
Stationary tensioning device 9.2
First fixing seat 9.2.1
Magnet mounting base 9.2.2
First magnet 9.2.3
First mandrel 9.2.4
First rear tension sheet 9.2.5
First front tension sheet 9.2.6
First fixing nut 9.2.7
Yarn-guiding porcelain hook 9.2.8
Second magnet 9.2.9
Guide pin 9.2.10
First connecting rod 9.3
Mobile tension device 9.4
Connecting flat iron 9.4.1
Second fixed seat 9.4.2
Second mandrel 9.4.3
Second rear tension sheet 9.4.4
Second front tension sheet 9.4.5
Spring 9.4.6
Second fixing nut 9.4.7
Thread guide porcelain eye 9.5
Linear displacement sensor 9.6
Drive nut 9.7
Second connecting rod 9.8
Guide groove 9.9
Sliding plate 10
Sliding roller set 11
And a yarn 13.
Detailed Description
The invention is described in further detail below with reference to the accompanying examples.
Referring to fig. 1, a collective tension adjusting device 2 in this embodiment is mounted on a bobbin creel beam 3 of a bobbin creel frame 1, the collective tension adjusting device 2 can move left and right along the bobbin creel beam 3, and a plurality of sections of bobbin creel frame connections can be configured according to warping process requirements;
referring to fig. 2 and 3, the tension device 2 for collective adjustment in the present embodiment includes two upper and lower tensioner longitudinal beams 8, a plurality of tension device units 9 are arranged in parallel between the two upper and lower tensioner longitudinal beams 8, each tension device unit 9 includes a tension device upright column 9.1, a row of fixed tension devices 9.2 is arranged on a front side of the tension device upright column 9.1 along a vertical direction, a first connecting rod 9.3 capable of sliding up and down along the vertical direction is arranged on a left side of the row of fixed tension devices 9.2, a row of movable tension devices 9.4 is arranged on the first connecting rod 9.3 along the vertical direction, a row of yarn guide porcelain eyes 9.5 is arranged on both left and right sides of the tension device upright column 9.1, and the yarn guide porcelain eyes 9.5 are in one-to-one correspondence with the fixed tension devices 9.2 and are located on a same horizontal line;
a linear displacement sensor 9.6 is arranged on the tension device upright post 9.1 above the row of movable tension devices 9.4;
both the front side and the rear side of the upper tensioner longitudinal beam 8 are provided with sliding plates 10, the sliding plates 10 are provided with sliding roller groups 11, and the sliding roller groups 11 are arranged on the bobbin creel beam 3;
referring to fig. 4, the fixed tension device 9.2 in this embodiment includes a first fixing seat 9.2.1, the first fixing seat 9.2.1 is fixedly disposed on a tension device column 9.1, a magnet mounting seat 9.2.2 is disposed on the first fixing seat 9.2.1 and is movable in a front-rear direction, a first magnet 9.2.3 is disposed at a front end of the magnet mounting seat 9.2.2.2, a first spindle 9.2.4 is disposed at a front end of the first fixing seat 9.2.1, a first rear tension sheet 9.2.5 and a first front tension sheet 9.2.6 are disposed on the first spindle 9.2.4, the first rear tension sheet 9.2.5 and the first front tension sheet 9.2.6 are mounted on the first fixing seat 9.2.1 through a first fixing nut 9.2.7, a second rear tension sheet 3534 is disposed between the first rear tension sheet 9.2.5 and the first fixing seat 9.2.1, and a second front tension sheet 9.2.8 is disposed between the first fixing seat 3534.2.2.3 zxft 3534 and a porcelain piece 3534 zft 3934;
in the embodiment, the clamping force of the first front tension sheet and the first rear tension sheet is controlled by the principle that like poles of the first magnet and the second magnet repel each other, when the magnet fixing seat provided with the first magnet moves forwards, the repelling force is increased, and the repelling force is reduced when the magnet fixing seat moves backwards, so that the clamping force between the front tension sheet and the rear tension sheet is changed, and the purpose of changing the yarn tension is achieved;
referring to fig. 5, the fixed tension device 9.2 in this embodiment includes a first fixing seat 9.2.1, the first fixing seat 9.2.1 is fixedly disposed on a tension device column 9.1, a magnet mounting seat 9.2.2 capable of moving in a front-back direction is disposed on the first fixing seat 9.2.1, a first magnet 9.2.3 is disposed at a front end of the magnet mounting seat 9.2.2.2, a first mandrel 9.2.4 is disposed at a front end of the first fixing seat 9.2.1, a first rear tension sheet 9.2.5 and a first front tension sheet 9.2.6 are disposed on the first mandrel 9.2.4, the first rear tension sheet 9.2.5 and the first front tension sheet 9.2.6 are mounted on the first fixing seat 9.2.1 through a first fixing nut 9.2.7, a second rear tension sheet 5332 zxft 3432 and a first front tension sheet 5362 zxft 5364 are disposed between a first fixing nut 5332 zxft 5332 and a first front tension sheet 5364 zxft 4264 zft porcelain piece 5364 zft 4234.34;
in the embodiment, the second magnet is arranged at the front end of the first front tension sheet, and the clamping force between the first front tension sheet and the first rear tension sheet is changed by the opposite attraction principle of the first magnet and the second magnet, so that the tension of the yarn is changed;
the fixed tension device is installed in parallel with the ground, the installation has the advantages that the yarn tension is not influenced by the weight of the tension sheet, the change of the yarn Zhang Li caused by the weight of the tension sheet can be avoided, but the defect is that the yarn is easy to separate from the tension sheet, and therefore, in order to solve the problem, the yarn guide porcelain hook is grabbed between the front tension and the rear tension.
Referring to fig. 4 to 6, a second connecting rod 9.8 capable of sliding up and down along the vertical direction is arranged in the tension device upright post 9.1, a plurality of guide grooves 9.9 are formed in the second connecting rod 9.8, the guide grooves 9.9 are arranged in an inclined manner, a guide pin 9.2.10 is arranged at the rear end of the magnet mounting seat 9.2.2, and the guide pin 9.2.10 is clamped in the guide groove 9.9;
the magnet mounting seat can be driven to move back and forth in the fixed seat through the up-and-down sliding of the second connecting rod, so that the distance between the first magnet and the second magnet is adjusted, and the clamping force between the first front tension sheet and the first rear tension sheet is adjusted by utilizing the repulsive force or attractive force between the first magnet and the second magnet;
referring to fig. 7, the mobile tension device 9.4 includes a connection flat iron 9.4.1, the connection flat iron 9.4.1 is fixedly connected to the first link 9.3, a second fixed seat 9.4.2 is disposed in front of the connection flat iron 9.4.1, a second spindle 9.4.3 is disposed in the center of the second fixed seat 9.4.2, a second rear tension sheet 9.4.4 and a second front tension sheet 9.4.5 are disposed on the second spindle 9.4.3, the second rear tension sheet 9.4.4 and the second front tension sheet 5272 zxft 3572 are fixedly mounted on the second fixed seat 9.4.2 by a second fixing bolt 9.4.7, and a spring 3584 is disposed between the second rear tension sheet 3524 zxft 353424 and the second fixed seat 3535 zxft 3584;
the clamping force between the second rear tension sheet and the second front tension sheet can be adjusted by adjusting the second fixing bolt and the spring;
referring to fig. 8, when the yarn requires less tension, the movable tension device does not work, and the required tension can be achieved by only adjusting the distance between the magnets of the fixed tension device; when the yarn tension exceeds the adjusting range of the fixed tension device, the movable tension device moves downwards, the yarn tension is changed by changing the wrap angle of the yarn, and the moving range is controlled by a linear displacement sensor or a similar encoder capable of detecting the moving distance. When the movable tension device moves downwards, the wrap angle of the yarn changes, and the yarn tension changes.
Referring to fig. 2, a first transmission shaft 6 and a second transmission shaft 7 are arranged on a tensioner longitudinal beam 8 on the upper side in parallel along the front-back direction, a first speed reduction motor 4 and a second speed reduction motor 5 are arranged on a sliding plate 10 on the front side or the rear side, the first speed reduction motor 4 and the second speed reduction motor 5 are respectively used for driving the first transmission shaft 6 and the second transmission shaft 7, a plurality of transmission gear boxes 12 are respectively arranged on the first transmission shaft 6 and the second transmission shaft 7, transmission screws are arranged in the transmission gear boxes 12, transmission nuts 9.7 are respectively arranged at the upper ends of the first connecting rod 9.3 and the second connecting rod 9.8, and the transmission screws in the transmission gear boxes 12 on the first transmission shaft 6 and the second transmission shaft 7 are respectively used for driving the transmission nuts 9.7 at the upper ends of the first connecting rod 9.3 and the second connecting rod 9.8 to move up and down.
In addition to the above embodiments, the present invention also includes other embodiments, and any technical solutions formed by equivalent transformation or equivalent replacement should fall within the scope of the claims of the present invention.
Claims (6)
1. A collective adjustment tension device, characterized in that: the tension device comprises an upper tensioner longitudinal beam and a lower tensioner longitudinal beam (8), a plurality of tension device units (9) are arranged between the upper tensioner longitudinal beam and the lower tensioner longitudinal beam (8) in parallel, each tension device unit (9) comprises a tension device upright column (9.1), a row of fixed tension devices (9.2) are arranged on the front side of each tension device upright column (9.1), a first connecting rod (9.3) capable of sliding up and down is arranged on the left side of each row of fixed tension devices (9.2), a row of movable tension devices (9.4) are arranged on each first connecting rod (9.3), a row of yarn guide porcelain eyes (9.5) are arranged on the left side and the right side of each tension device upright column (9.1), and the yarn guide porcelain eyes (9.5) on the left side and the right side correspond to the fixed tension devices (9.2) one by one and are positioned on the same horizontal line;
the fixed tension device (9.2) comprises a first fixed seat (9.2.1), a magnet installation seat (9.2.2) capable of moving in the front-back direction is arranged on the first fixed seat (9.2.1), a first magnet (9.2.3) is arranged at the front end of the magnet installation seat (9.2.2), a first mandrel (9.2.4) is arranged at the front end of the first fixed seat (9.2.1), a first rear tension sheet (9.2.5) and a first front tension sheet (9.2.6) are arranged on the first mandrel (9.2.4), the first rear tension sheet (9.2.5) and the first front tension sheet (26 zxft 3526) are installed on the first fixed seat (9.2.1) through a first fixing nut (9.2.7), a first tension hook (3524 zxft 3534) is arranged between the first rear tension sheet (9.2.5) and the first fixed seat (9.2.1), and a second tension sheet (3524 zxft 3534) is arranged between the first rear tension sheet (9.2.2.3.3.3.3.3.3) and a second tension sheet (3534);
or the fixed tension device (9.2) comprises a first fixed seat (9.2.1), a magnet mounting seat (9.2.2) capable of moving in the front-back direction is arranged on the first fixed seat (9.2.1), a first magnet (9.2.3) is arranged at the front end of the magnet mounting seat (9.2.2), a first mandrel (9.2.4) is arranged at the front end of the first fixed seat (9.2.1), a first rear tension sheet (9.2.5) and a first front tension sheet (9.2.6) are arranged on the first mandrel (9.2.4), the first rear tension sheet (9.2.5) and the first front tension sheet (9.2.6) are arranged on the first fixed seat (9.2.1) through a first fixing nut (9.2.7), a first fixing nut (32 zxft 3432) and a first front tension sheet (9.2.6) are arranged between the first fixed seat (9.2.2.1), and a second front tension hook (4232) is arranged between the first fixing nut (32 zxft 3432) and the first front tension sheet (5362 zxft) and a second tension hook (4232 zxft) is arranged between the first fixing nut (4264 zxft 4234);
the movable tension device (9.4) comprises a connecting flat iron (9.4.1), the connecting flat iron (9.4.1) is fixedly connected with the first connecting rod (9.3), a second fixed seat (9.4.2) is arranged on the front side of the connecting flat iron (9.4.1), a second mandrel (9.4.3) is arranged in the center of the second fixed seat (9.4.2), a second rear tension sheet (3524) and a second front tension sheet (9.4.5) are arranged on the second mandrel (9.4.3), the second rear tension sheet (4984 zxft 5272) and the second front tension sheet (9.4.5) are fixedly mounted on the second fixed seat (9.4.2) through a second fixing bolt (7945 zxft 3545), and a spring 3535 is arranged between the second rear tension sheet (4924 zxft 3584) and the second front tension sheet (353535357984).
2. A collective adjustment tension device as set forth in claim 1 wherein: the tension device is characterized in that a second connecting rod (9.8) capable of sliding up and down is arranged in the tension device upright post (9.1), a plurality of guide grooves (9.9) are formed in the second connecting rod (9.8), the guide grooves (9.9) are obliquely arranged, a guide pin (9.2.10) is arranged at the rear end of the magnet mounting seat (9.2.2), and the guide pin (9.2.10) is clamped in the guide grooves (9.9).
3. A collective adjustment tension device as set forth in claim 2 wherein: first transmission shaft (6) and second transmission shaft (7) are arranged on tensioner longeron (8) of upside along the fore-and-aft direction parallel, are provided with first gear motor (4) and second gear motor (5) on slide plate (10) of front side or rear side, and first gear motor (4) and second gear motor (5) are used for driving first transmission shaft (6) and second transmission shaft (7) respectively, all be provided with a plurality of drive gear box (12) on first transmission shaft (6) and second transmission shaft (7), set up drive screw in drive gear box (12), first connecting rod (9.3) and second connecting rod (9.8) upper end all are provided with drive nut (9.7), drive screw in drive gear box (12) on first transmission shaft (6) and second transmission shaft (7) is used for driving first connecting rod (9.3) and second connecting rod (9.8) drive nut (9.7) respectively to drive first connecting rod (9.3) and first connecting rod (9.8) up-and-down motion.
4. A collective adjustment tension device as set forth in claim 1 wherein: both sides all are provided with slide plate (10) around the tensioner longeron (8) of upside, be provided with on slide plate (10) and slide roller train (11).
5. A collective adjustment tension device according to claim 1, characterized in that: and a linear displacement sensor (9.6) is arranged on the tension device upright post (9.1) above the row of movable tension devices (9.4).
6. A collective adjustment tension device as set forth in claim 1 wherein: the collective tension adjusting device is arranged on a bobbin creel cross beam (3) of the bobbin creel frame (1), and the collective tension adjusting device (2) can move left and right along the bobbin creel cross beam (3).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710450709.5A CN107338548B (en) | 2017-06-15 | 2017-06-15 | Collective tension adjusting device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710450709.5A CN107338548B (en) | 2017-06-15 | 2017-06-15 | Collective tension adjusting device |
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| CN107338548A CN107338548A (en) | 2017-11-10 |
| CN107338548B true CN107338548B (en) | 2023-01-13 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710450709.5A Active CN107338548B (en) | 2017-06-15 | 2017-06-15 | Collective tension adjusting device |
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| CN (1) | CN107338548B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107938043A (en) * | 2018-01-02 | 2018-04-20 | 江阴市华方新技术科研有限公司 | The cleaning device of carry-over pinch rolls |
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| CN206015189U (en) * | 2016-07-22 | 2017-03-15 | 山东合信科技股份有限公司 | A kind of tension piece for the production of elastic force weft yarn |
| CN206015188U (en) * | 2016-07-22 | 2017-03-15 | 山东合信科技股份有限公司 | A kind of spun yarn unit with wire members and dust arrester |
| CN207062475U (en) * | 2017-06-15 | 2018-03-02 | 江阴市华方新技术科研有限公司 | Collective adjusts tensioner |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2073795A (en) * | 1980-04-15 | 1981-10-21 | Ciniglio A J | Skeining Device |
| CH676254A5 (en) * | 1988-02-05 | 1990-12-28 | Benninger Ag Maschf | |
| CN2394922Y (en) * | 1999-10-31 | 2000-09-06 | 常州市第八纺织机械厂 | Liquid damping compensation tension device |
| CN2903113Y (en) * | 2006-01-28 | 2007-05-23 | 祁江汀 | Warp wafer separating multiaxis coiler |
| CN201221008Y (en) * | 2008-06-10 | 2009-04-15 | 浙江宝娜斯袜业有限公司 | Adjustable yarn magnetic tension clip |
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| CN205471998U (en) * | 2016-03-17 | 2016-08-17 | 常州市乘福纺织整理有限公司 | Pile -containing fabric yarn tension device |
| CN206015189U (en) * | 2016-07-22 | 2017-03-15 | 山东合信科技股份有限公司 | A kind of tension piece for the production of elastic force weft yarn |
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| CN107338548A (en) | 2017-11-10 |
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