CN104963042B - The wire passing device of the not general light polyurethane fiber yarn of conductivity type in coating machine - Google Patents
The wire passing device of the not general light polyurethane fiber yarn of conductivity type in coating machine Download PDFInfo
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- CN104963042B CN104963042B CN201510300016.9A CN201510300016A CN104963042B CN 104963042 B CN104963042 B CN 104963042B CN 201510300016 A CN201510300016 A CN 201510300016A CN 104963042 B CN104963042 B CN 104963042B
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Abstract
The invention provides in a kind of coating machine the not general light polyurethane fiber yarn of conductivity type wire passing device, belong to textile technology field.It solves no targeting part in silk covering machine of the prior art, it is impossible to which yarn is transported in silk covering machine one by one, the technical problem such as guide effect is poor, conveying is unstable.The wire passing device of the not general light polyurethane fiber yarn of conductivity type in this coating machine, it is arranged in the frame of coating machine, it includes connecting cylinder, conductor barrel and conductor cap, connecting cylinder and conductor barrel are cylindrical, connecting cylinder is enclosed within the outside of conductor barrel, conductor barrel upper end has the convex edge of protrusion and convex edge is resisted against connecting cylinder upper end, stretch out connecting cylinder in conductor barrel lower end, conductor cap is enclosed within conductor barrel lower end and both threaded connections, there is at the inner port of conductor barrel upper end the introduction part one for seamlessly transitting, there is at the inner port of conductor cap lower end the introduction part two for seamlessly transitting.The present invention has that guide effect is good, convey reliable advantage.
Description
Technical field
The invention belongs to textile technology field, is related to a kind of wire passing device, in particularly a kind of coating machine, conductivity type is not general
The wire passing device of light polyurethane fiber yarn.
Background technology
Elastomeric yarn with spandex covered yarn as major product, range of application are more and more wider, and product consumption is increasing.
Cladding wire, also known as fasciated yarn, is a kind of yarn of new structure, and it is the outsourcing another kind long filament with long filament or chopped fiber as yarn core
Or chopped fiber sliver, outsourcing yarn coated to heart yarn in a screw fashion, does uniform, bulk plentiful, yarn light with bar
Sliding and filoplume is few, strength height, the advantage of little breakage.Cladding wire needs substantial amounts of winch spool to be rolled up in cladding winding process
Around.
Jing is retrieved, and such as Chinese patent literature discloses the silk covering machine that a kind of disposable double-contracting is covered【Application number：
201320094043.1；Notification number：CN 203080159U】.The silk covering machine that this disposable double-contracting is covered, it is characterised in that bag
Including rack and rack-mounted feeding mechanism, covering machine structure, drawing-off structure, spooler and transmission mechanism, the charging
Mechanism includes the feed wheel for driving core filaments to rotate and feeds silk roller, and the covering machine structure is two, upper and lower along core filaments direction of transfer
Arrangement, the spindle that the covering machine structure includes spool and drives spool to rotate, spindle and the transmission mechanism of upper and lower covering machine structure are passed
Dynamic connection, and drive move toward one another, the drawing-off structure to include draw roll and the pinch roller for cooperating, the volume by transmission mechanism
Taking mechanism includes the winding wheel for cooperating and batches component.
Although the silk covering machine disclosed in the patent need not repeat cladding operation, a large amount of manpowers and cost are saved,
Production efficiency is greatly improved, but, no targeting part in the silk covering machine, it is impossible to which yarn is transported to silk covering machine one by one
In, guide effect is poor, conveying is unstable, therefore, design the not general light polyurethane fiber yarn of conductivity type in a kind of coating machine
Wire passing device be necessary.
The content of the invention
The purpose of the present invention is there are the problems referred to above for existing technology, it is proposed that in a kind of coating machine, conductivity type is not general
The wire passing device of light polyurethane fiber yarn, the wire passing device is with the characteristics of making good use of, conveying reliability.
The purpose of the present invention can be realized by following technical proposal：The not general light polyurethane fiber of conductivity type in coating machine
The wire passing device of yarn, it is arranged in the frame of coating machine, it is characterised in that it includes connecting cylinder, conductor barrel and conductor cap,
The connecting cylinder and conductor barrel are cylindrical, and the connecting cylinder is enclosed within the outside of conductor barrel, and the conductor barrel is the wear-resisting of flexibility
Material, the conductor barrel upper end has the convex edge of protrusion and convex edge is resisted against connecting cylinder upper end, and company is stretched out in the conductor barrel lower end
Cylinder is connect, above-mentioned conductor cap is enclosed within conductor barrel lower end and both threaded connections, has smooth at the inner port of the conductor barrel upper end
The introduction part one of transition, has the introduction part two for seamlessly transitting at the inner port of the conductor cap lower end.
The operation principle of the present invention is as follows：Connecting cylinder is inserted in from the lower end of conductor barrel, conductor cap is threaded in and is led
The lower end of spool, conductivity type not general light polyurethane fiber yarn is penetrated in conductor barrel, by introduction part one and introduction part two
Guide effect, can make its it is more stable be input in coating machine, so as to complete over-line operation, guide effect is good, conveying can
Lean on；The intensity of conductor barrel by connecting cylinder is enclosed within outside conductor barrel, can be increased, intensity is high.
The conductor barrel lower end is located in conductor cap, has the importing for seamlessly transitting at the inner port of the conductor barrel lower end
Portion three.
Using above structure, the frictional resistance of yarn and conductor barrel lower end can be reduced, be conveyed more smooth.
In annular shape, the external diameter all same and three's coaxial inner conductor of the convex edge, connecting cylinder and conductor cap set for the convex edge
Put.
There is between the convex edge and connecting cylinder upper end resetting structure, connecting cylinder is with to remote in the presence of resetting structure
The trend moved away from convex edge.
Using above structure, connecting cylinder can be enable to away from movement, good operating stability at convex edge by resetting structure.
Described resetting structure is the rubber contact pad in annular, and the rubber contact pad is for flexible material and which is tight
It is pressed between connecting cylinder and convex edge.
Using above structure, by the elastic reaction of rubber contact pad, connecting cylinder can be enable to moving away from convex edge, together
When can play a part of buffering, damping to connecting cylinder, noise is little.
The external diameter of the rubber contact pad is identical with external diameter at convex edge and rubber contact pad on the outside of with convex edge on the outside of flush.
Using above structure, the contact area of rubber contact pad and convex edge can be increased so as to preferable stress effect can be reached
It is really good, large carrying capacity.
Alternatively scheme, described resetting structure is to be enclosed within the spring on the outside of conductor barrel, the two ends of the spring
Top pressure is in convex edge and connecting cylinder upper end respectively.
Using above structure, by the elastic reaction of spring, connecting cylinder can be enable to moving away from convex edge, while to even
Connect cylinder and can play a part of buffering, damping, noise is little.
Packing ring is cased with the conductor barrel also, the packing ring is pressed between conductor cap and connecting cylinder.
Using above structure, can prevent conductor cap from occurring loosening by packing ring, reliable lock.
Described packing ring is spring washer.
Alternatively scheme, described packing ring are flexible rubber washer.
The washer outer diameter and conductor cap external diameter match and on the outside of packing ring with conductor cap on the outside of flush.
Using above structure, the contact area of packing ring and conductor cap can be increased so as to preferable stressed effect can be reached, held
Loading capability is big.
This wire passing device also includes a gripper shoe and connecting rod, and described connecting rod the inner is connected in connecting cylinder sidepiece, described
Connecting rod outer end is hinged on gripper shoe outer end and has the latch-up structure that can be locked both therebetween, in the gripper shoe
Hold and be connected for the frame with coating machine.
Using above structure, quickly connecting rod and gripper shoe can be positioned together by latch-up structure, positioning is quick, side
Just.
The axis perpendicular of described connecting rod and connecting cylinder.
The latch-up structure includes the adjustment hole in gripper shoe through its both sides, and above-mentioned connecting rod outer end is located at adjustment hole
Place, the gripper shoe outer end are threaded with lock screw, and described lock screw the inner is located at adjustment hole and which can be resisted against
On the outside of connecting rod.
When needing to adjust the position of conductor barrel, lock screw is unscrewed, by rotating connecting rod, connecting rod drives connecting cylinder
Rotate, connecting cylinder drives conductor barrel to rotate, and so as to be adjusted to the position of conductor barrel, can meet the needs of different operating,
Highly versatile.
Alternatively scheme, described latch-up structure includes the uniform positioning recess of connecting rod external circumferential, described
The adjustment hole sidepiece of gripper shoe has in recessed lock hole, the lock hole and has top pressure spring and ball, in above-mentioned top pressure
Under the elastic force effect of spring, the ball part is stretched out adjustment hole and can be embedded in above-mentioned any one positioning recess.
When needing to adjust the position of conductor barrel, by rotating connecting rod, connecting rod drives connecting cylinder to rotate, connecting cylinder band
Dynamic conductor barrel is rotated, and conductor barrel is adjusted to after correct position, under the elastic force effect of spring, ball is embedded position accordingly it is recessed
It is in mouthful, so as to be adjusted to the position of conductor barrel, easy to adjust, quick.
There is in the gripper shoe gear edge of protrusion, above-mentioned connecting rod is resisted against gear along upside.
Using above structure, the contact area between gripper shoe and connecting rod connection can be increased, bulk strength is high.
Wear-resistant pad in a ring is cased with the gripper shoe also, above-mentioned wear-resistant pad is crushed on gear along and connecting rod between.
Using above structure, the abrasion resistance of gripper shoe and connecting rod, long service life can be increased.
Compared with prior art, in this coating machine the not general light polyurethane fiber yarn of conductivity type wire passing device with
Lower advantage：
1st, it is of the invention by yarn is penetrated in conductor barrel, by the guide effect of introduction part one and introduction part two, by yarn
Line is input in coating machine, realizes its over-line operation, and yarn can be conveyed one by one, and guide effect is good, conveying is reliable.
2nd, resetting structure is rubber contact pad, and rubber contact pad is to be pressed between connecting cylinder and convex edge；Using the knot
Structure, by the elastic reaction of rubber contact pad, can enable connecting cylinder to moving away from convex edge, while can play slow to connecting cylinder
Punching, the effect of damping, noise are little.
3rd, packing ring is cased with conductor barrel, packing ring is pressed between conductor cap and connecting cylinder；Using the structure, by packing ring
Can prevent conductor cap from occurring loosening, reliable lock.
4th, connecting cylinder is enclosed within the outside of conductor barrel, using the structure, by connecting cylinder is enclosed within outside conductor barrel, can increase wire
The intensity of cylinder, intensity is high, long service life.
Description of the drawings
Fig. 1 is the dimensional structure diagram of the present invention.
Fig. 2 is the close-up schematic view in Fig. 1 at A.
Fig. 3 is the planar structure schematic diagram of the present invention.
Fig. 4 is the complete section schematic diagram that the present invention removes part.
In figure, 1, frame；2nd, connecting rod；3rd, gripper shoe；3a, gear edge；4th, conductor barrel；4a, introduction part one；4b, convex edge；
4c, introduction part three；5th, connecting cylinder；6th, conductor cap；6a, introduction part two；7th, wear-resistant pad；8th, lock screw；9th, rubber contact pad；
10th, packing ring.
Specific embodiment
The following is the specific embodiment of the present invention and combine accompanying drawing, technical scheme is further described,
But the present invention is not limited to these embodiments.
As shown in Fig. 1, Fig. 3, Fig. 4, the wire passing device of the not general light polyurethane fiber yarn of conductivity type in this coating machine, it
It is arranged in the frame 1 of coating machine, it includes that connecting cylinder 5, conductor barrel 4 and conductor cap 6, connecting cylinder 5 and conductor barrel 4 are in cylinder
Shape, connecting cylinder 5 are enclosed within the outside of conductor barrel 4, by connecting cylinder 5 to be enclosed within the intensity that can increase conductor barrel 4 outside conductor barrel 4, intensity
It is high；Conductor barrel 4 is flexible high-abrasive material, and in the present embodiment, the material of conductor barrel 4 can adopt nylon；4 upper end of conductor barrel
With protrusion convex edge 4b and convex edge 4b is resisted against 5 upper end of connecting cylinder, connecting cylinder 5 is stretched out in 4 lower end of conductor barrel, and conductor cap 6 is enclosed within
4 lower end of conductor barrel and both threaded connections, can be fixed on connecting cylinder 5 on conductor barrel 4 by conductor cap 6, be fixed conveniently, soon
Speed；There is at the inner port of 4 upper end of conductor barrel one 4a of introduction part for seamlessly transitting, have at the inner port of 6 lower end of conductor cap flat
Slip over two 6a of introduction part for crossing；4 lower end of conductor barrel is located in conductor cap 6, has and seamlessly transit at the inner port of 4 lower end of conductor barrel
Three 4c of introduction part；Using the structure, the frictional resistance of 4 lower end of yarn and conductor barrel can be reduced, be conveyed more smooth；Convex edge 4b
In annular shape, the external diameter all same of convex edge 4b, connecting cylinder 5 and conductor cap 6 and three's coaxial inner conductor are arranged.
As shown in Fig. 1, Fig. 3, Fig. 4, there is resetting structure, in the work of resetting structure between 5 upper end of convex edge 4b and connecting cylinder
With lower connecting cylinder 5 with the trend moved at away from convex edge 4b；Using the structure, connecting cylinder 5 can be enable by resetting structure
To away from movement, good operating stability at the 4b of convex edge.
As shown in Fig. 1, Fig. 3, Fig. 4, resetting structure is the rubber contact pad 9 in annular, and rubber contact pad 9 is flexible material
Expect and which is pressed between connecting cylinder 5 and convex edge 4b, in the present embodiment, rubber contact pad 9 can be using rubber processing
Into；Using the structure, by the elastic reaction of rubber contact pad 9, can enable connecting cylinder 5 to away from the 4b of convex edge move, while
Buffering, damping can be played a part of to connecting cylinder 5, noise is little.
As shown in Fig. 1, Fig. 3, Fig. 4, the external diameter of rubber contact pad 9 is identical with external diameter at the 4b of convex edge and rubber contact pad 9 outside
Flush on the outside of side and convex edge 4b；Using the structure, the contact area of rubber contact pad 9 and convex edge 4b can be increased so as to can reach
Good, the large carrying capacity to preferable stressed effect.
According to actual conditions, it would however also be possible to employ this kind of embodiment, i.e.,：Resetting structure is to be enclosed within the bullet on the outside of conductor barrel 4
Spring, the two ends of spring distinguish top pressure in 5 upper end of convex edge 4b and connecting cylinder；Using the structure, by the elastic reaction of spring, can make
Connecting cylinder 5 can be to moving away from the 4b of convex edge, while can play a part of buffering, damping to connecting cylinder 5, noise is little.
As shown in Fig. 1, Fig. 3, Fig. 4, packing ring 10 on conductor barrel 4, is also cased with, packing ring 10 is pressed on conductor cap 6 and connecting cylinder
Between 5；Using the structure, can prevent conductor cap 6 from occurring loosening by packing ring 10, reliable lock；10 external diameter of packing ring and conductor cap 6
External diameter match and on the outside of packing ring 10 with 6 outside flush of conductor cap；Using the structure, packing ring 10 and conductor cap 6 can be increased
Contact area so as to preferable stressed effect, large carrying capacity can be reached；Packing ring 10 is spring washer 10, it is of course also possible to adopt
With this kind of embodiment, i.e.,：Packing ring 10 is flexible rubber washer 10.
As shown in Figure 1, Figure 2, Figure 3 shows, this wire passing device also includes a gripper shoe 3 and connecting rod 2, and connecting rod 2 is inner to be connected
In 5 sidepiece of connecting cylinder, the inner of connecting rod 2 is connected in the sidepiece of connecting cylinder 5 by way of welding；2 outer end of connecting rod is hinged
There is in 3 outer end of gripper shoe and therebetween the latch-up structure that can be locked both, 3 the inner of gripper shoe for coating machine
Frame 1 is connected, and the inner of gripper shoe 3 is connected with frame 1 by way of welding；Using the structure, can be fast by latch-up structure
Connecting rod 2 and gripper shoe 3 are positioned together by speed, and positioning is quick, convenient；The axis perpendicular of connecting rod 2 and connecting cylinder 5.
As shown in Figure 1, Figure 2, Figure 3 shows, latch-up structure includes the adjustment hole in gripper shoe 3 through its both sides, 2 outer end of connecting rod
At adjustment hole, 3 outer end of gripper shoe is threaded with lock screw 8, and 8 the inner of lock screw is located at adjustment hole and which can support
Lean against on the outside of connecting rod 2, connecting rod 2 can be fixed in gripper shoe 3 by lock screw 8.
According to actual conditions, it would however also be possible to employ this kind of embodiment, i.e.,：Latch-up structure includes that 2 external circumferential of connecting rod is equal
The positioning recess of cloth, in the present embodiment, the quantity of positioning recess is 12；The adjustment hole sidepiece of gripper shoe 3 has recessed
Lock hole, the quantity of lock hole is also 12；There is in lock hole top pressure spring and ball, make in the elastic force of top pressure spring
Adjustment hole is stretched out with lower ball part and can be embedded in any one positioning recess.
As shown in Figure 1, Figure 2, Figure 3 shows, there is the gear of protrusion along 3a in gripper shoe 3, connecting rod 2 is resisted against gear on the upside of 3a,
Using the structure, the contact area between gripper shoe 3 and the connection of connecting rod 2 can be increased, bulk strength is high；Also cover in gripper shoe 3
There is wear-resistant pad 7 in a ring, wear-resistant pad 7 is crushed on gear between 3a and connecting rod 2；Using the structure, 3 He of gripper shoe can be increased
The abrasion resistance of connecting rod 2, long service life.
The operation principle of the present invention is as follows：By rubber contact pad 9, connecting cylinder 5 and packing ring 10 successively from the lower end of conductor barrel 4
It is inserted in, conductor cap 6 is threaded in into the lower end of conductor barrel 4；Lock screw 8 is unscrewed, by rotating connecting rod 2,2 band of connecting rod
Dynamic connecting cylinder 5 is rotated, and connecting cylinder 5 drives conductor barrel 4 to rotate, and the position adjustments of conductor barrel 4 are good；Conductivity type not general light is gathered
Urethane fiber yarn is penetrated in conductor barrel 4, by the guide effect of two 6a of one 4a of introduction part and introduction part, which can be made more stable
Be input in coating machine.
Specific embodiment described herein is only explanation for example spiritual to the present invention.Technology neck belonging to of the invention
The technical staff in domain can be made various modifications or supplement or replaced using similar mode to described specific embodiment
Generation, but without departing from the spiritual of the present invention or surmount scope defined in appended claims.
Although more used herein frame 1, connecting rod 2, gripper shoe 3, gear along 3a, conductor barrel 4, one 4a of introduction part,
Convex edge 4b, three 4c of introduction part, connecting cylinder 5, conductor cap 6, two 6a of introduction part, wear-resistant pad 7, lock screw 8, rubber contact pad 9, pad
10 grade terms are enclosed, but is not precluded from the possibility using other terms.It is used for the purpose of more easily describing using these terms
With the essence for explaining the present invention；It is all contrary with spirit of the invention to be construed as any additional restriction.
Claims (9)
1. in coating machine the not general light polyurethane fiber yarn of conductivity type wire passing device, it is arranged in the frame of coating machine,
Characterized in that, it includes connecting cylinder, conductor barrel and conductor cap, the connecting cylinder and conductor barrel are cylindrical, the connection
On the outside of conductor barrel, the conductor barrel is flexible high-abrasive material to jacket casing, and the material of conductor barrel adopts nylon, on the conductor barrel
End is with the convex edge protruded and convex edge is resisted against connecting cylinder upper end, and connecting cylinder, above-mentioned wire cap sleeve are stretched out in the conductor barrel lower end
In conductor barrel lower end and both threaded connections, there is at the inner port of the conductor barrel upper end introduction part one that seamlessly transits, institute
State and there is at the inner port of conductor cap lower end the introduction part two for seamlessly transitting；Have between the convex edge and connecting cylinder upper end and reset
Structure, in the presence of resetting structure, connecting cylinder is with the trend moved at away from convex edge.
2. in coating machine according to claim 1 the not general light polyurethane fiber yarn of conductivity type wire passing device, which is special
Levy and be, the conductor barrel lower end is located in conductor cap, there is at the inner port of the conductor barrel lower end importing for seamlessly transitting
Portion three.
3. in coating machine according to claim 1 the not general light polyurethane fiber yarn of conductivity type wire passing device, which is special
Levy and be, in annular shape, the external diameter all same and three's coaxial inner conductor of the convex edge, connecting cylinder and conductor cap set for the convex edge
Put.
4. in coating machine according to claim 1 the not general light polyurethane fiber yarn of conductivity type wire passing device, which is special
Levy and be, described resetting structure is the rubber contact pad in annular, and the rubber contact pad is for flexible material and which is tight
It is pressed between connecting cylinder and convex edge.
5. in coating machine according to claim 4 the not general light polyurethane fiber yarn of conductivity type wire passing device, which is special
Levy and be, the external diameter of the rubber contact pad is identical with external diameter at convex edge and rubber contact pad on the outside of with convex edge on the outside of flush.
6. in coating machine according to claim 1 the not general light polyurethane fiber yarn of conductivity type wire passing device, which is special
Levy and be, described resetting structure is to be enclosed within the spring on the outside of conductor barrel, top pressure is distinguished in convex edge and company in the two ends of the spring
Connect a upper end.
7. in coating machine according to claim 1 the not general light polyurethane fiber yarn of conductivity type wire passing device, which is special
Levy and be, on the conductor barrel, be also cased with packing ring, the packing ring is pressed between conductor cap and connecting cylinder.
8. in coating machine according to claim 7 the not general light polyurethane fiber yarn of conductivity type wire passing device, which is special
Levy and be, described packing ring is spring washer.
9. in coating machine according to claim 7 the not general light polyurethane fiber yarn of conductivity type wire passing device, which is special
Levy and be, the washer outer diameter and conductor cap external diameter match and on the outside of packing ring with conductor cap on the outside of flush.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510300016.9A CN104963042B (en) | 2015-06-03 | 2015-06-03 | The wire passing device of the not general light polyurethane fiber yarn of conductivity type in coating machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510300016.9A CN104963042B (en) | 2015-06-03 | 2015-06-03 | The wire passing device of the not general light polyurethane fiber yarn of conductivity type in coating machine |
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| CN104963042A CN104963042A (en) | 2015-10-07 |
| CN104963042B true CN104963042B (en) | 2017-03-29 |
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Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104928822B (en) * | 2015-06-03 | 2017-06-20 | 海宁市亚星花色丝有限公司 | The wire passing device of high resiliency rub resistance polyurethane fiber yarn in coating machine |
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| CN101215741A (en) * | 2008-01-09 | 2008-07-09 | 江苏宏源纺机股份有限公司 | Spandex feeding device |
| CN201155002Y (en) * | 2008-01-14 | 2008-11-26 | 王至昶 | Economic core-spun yarn core silk leading-in device |
| CN102534894A (en) * | 2011-12-09 | 2012-07-04 | 罗正学 | Godet wheel device capable of preventing eccentricity and yarn faults |
| CN104928822A (en) * | 2015-06-03 | 2015-09-23 | 海宁市亚星花色丝有限公司 | Pass unit for high-elastic friction-resisting polyurethane fiber yarns in covering machines |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5766125A (en) * | 1980-10-14 | 1982-04-22 | Toray Ind Inc | Fiber transferring pipe and preparing apparatus for bound spun yarn |
| DE10344163B9 (en) * | 2003-09-22 | 2005-06-02 | Cetex Ingenieurgesellschaft für Maschinenbau mbH | Method and device for producing coregarn or cortex yarn |
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2015
- 2015-06-03 CN CN201510300016.9A patent/CN104963042B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101215741A (en) * | 2008-01-09 | 2008-07-09 | 江苏宏源纺机股份有限公司 | Spandex feeding device |
| CN201155002Y (en) * | 2008-01-14 | 2008-11-26 | 王至昶 | Economic core-spun yarn core silk leading-in device |
| CN102534894A (en) * | 2011-12-09 | 2012-07-04 | 罗正学 | Godet wheel device capable of preventing eccentricity and yarn faults |
| CN104928822A (en) * | 2015-06-03 | 2015-09-23 | 海宁市亚星花色丝有限公司 | Pass unit for high-elastic friction-resisting polyurethane fiber yarns in covering machines |
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