CN114808256B - Forming knitting machine for manufacturing seamless down jacket fabric - Google Patents
Forming knitting machine for manufacturing seamless down jacket fabric Download PDFInfo
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- CN114808256B CN114808256B CN202210506384.9A CN202210506384A CN114808256B CN 114808256 B CN114808256 B CN 114808256B CN 202210506384 A CN202210506384 A CN 202210506384A CN 114808256 B CN114808256 B CN 114808256B
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- China
- Prior art keywords
- yarn
- knitting machine
- clamping
- butt joint
- block
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- D—TEXTILES; PAPER
- D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
- D04B—KNITTING
- D04B15/00—Details of, or auxiliary devices incorporated in, weft knitting machines, restricted to machines of this kind
- D04B15/38—Devices for supplying, feeding, or guiding threads to needles
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
- B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
- B29C65/08—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using ultrasonic vibrations
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
- Y02P70/62—Manufacturing or production processes characterised by the final manufactured product related technologies for production or treatment of textile or flexible materials or products thereof, including footwear
Abstract
The invention discloses a forming knitting machine for manufacturing seamless down jacket fabric, which comprises a circular knitting machine and a creel, wherein a yarn feeding mechanism is arranged in the creel, a butt joint mechanism and a clamping mechanism are arranged on the side surface of the creel through side plates, an air cylinder and an ultrasonic adhesive device are also arranged on the surface of the side plates, and the yarn feeding mechanism circularly supplies yarn barrels through a driving wheel and a transmission chain, so that the invention has the following beneficial effects: the butt joint mechanism is arranged to butt joint the tail end of the yarn with the new yarn barrel yarn end, the butt joint can be completed in the process of not affecting the operation of the circular knitting machine, before the butt joint, when the first photoelectric switch detects that the tail end of the yarn passes, the driving source of the clamping block is controlled, the clamping block is closed, the tail end of the yarn is clamped, the front yarn is prevented from losing tension and bending, the butt joint is affected, and the alignment block is used for aligning the tail end of the yarn with the new yarn end in parallel, and the partial thickness and burrs can be reduced by maintaining tension and bonding in parallel.
Description
Technical Field
The invention relates to a forming knitting machine for manufacturing seamless down jacket fabric, and belongs to the technical field of knitting machines.
Background
The seamless down jacket fabric is generally manufactured by adopting a circular knitting machine, the circular knitting machine is a circular weft knitting machine (or called circular weft knitting machine), a loop forming system (called yarn feeding path number or loop forming path number in enterprises) of the circular knitting machine is more, the rotating speed is high, the yield is high, the flower deformation is quick, the fabric quality is good, the working procedures are few, the product adaptability is strong, and the circular knitting machine is composed of a frame, a yarn feeding mechanism, a transmission mechanism, a lubrication and dust removal (cleaning) mechanism, an electric control mechanism, a traction winding mechanism and other auxiliary devices.
The existing yarn feeding mechanism is used for feeding yarns through the yarn barrels and the yarn storage device, when the yarn barrels are finished, new yarn barrels are needed to be replaced manually and the yarns are butted, the operation is complex, the butting effect is poor, and the high-efficiency production requirement of the circular knitting machine is difficult to meet.
Disclosure of Invention
The invention provides a forming knitting machine for manufacturing a seamless down jacket fabric, which effectively solves the problems existing in the prior art.
In order to solve the technical problems, the invention provides the following technical scheme:
the utility model provides a make seamless down jacket surface fabric with shaping knitting machine, includes knitting circular knitting machine and creel, the inside of creel is provided with yarn feeding mechanism, and the side surface of creel is provided with docking mechanism and clamp and gets the mechanism through the curb plate, and the surface of curb plate still is provided with cylinder and ultrasonic bonding ware, and wherein, yarn feeding mechanism carries out circulation supply to the yarn section of thick bamboo through action wheel and drive chain;
the butt joint mechanism comprises a U-shaped groove block fixed on the surface of the side plate, a first photoelectric switch, a clamping block with a driving source, a cutting assembly and an alignment block are sequentially arranged on the inner side surface of the U-shaped groove block according to the yarn moving direction, the first photoelectric switch is electrically connected with the driving source of the clamping block, the cutting assembly comprises two cutters and a cutter groove for accommodating the cutters, the cutters take a rotating rod as an axis, the rotating rod is arranged in the U-shaped groove block, a protruding rod is arranged at the end part of the rotating rod, a sliding block for pushing the protruding rod is arranged on the side wall of the U-shaped groove block, and the output end of the air cylinder moves downwards to push the sliding block to slide so that the cutters rotate out of the cutter groove;
the clamping mechanism comprises a mechanical arm fixed on the surface of the side plate, the mechanical arm is controlled by a PLC, the end part of the mechanical arm is provided with a base plate and a clamping plate which are mutually hinged, the clamping plate is driven by a telescopic cylinder, the side surface of the base plate is also provided with a second photoelectric switch and a driving wheel for driving the yarn drum to rotate, and the second photoelectric switch and the telescopic cylinder are electrically connected with the PLC.
As a preferable technical scheme of the invention, a fixed rod is arranged on the surface of the transmission chain, the end part of the fixed rod is rotatably connected with a rotating piece, and a clamping rod for clamping the yarn barrel is arranged on the side surface of the rotating piece.
As a preferable technical scheme of the invention, the yarn is wound on the middle section of the outer surface of the main body of the yarn cylinder, and two ends of the main body of the yarn cylinder are exposed.
As a preferred technical scheme of the invention, the ultrasonic bonder comprises an ultrasonic generator and a bonding head, and is used for parallelly butting yarns.
As a preferable technical scheme of the invention, the two knife grooves are different in height, the horizontal height of the knife groove near one end of the sliding block is lower than that of the other knife groove, and the cutter in the lower knife groove is bent downwards.
As a preferred embodiment of the present invention, the side surfaces of the side plates are further provided with a yarn storage for transferring yarn to the circular knitting machine.
The beneficial effects achieved by the invention are as follows:
(1) According to the invention, the butt joint mechanism is arranged to butt joint the tail end of the yarn with the new yarn barrel yarn end, so that the butt joint can be completed in the process of not affecting the operation of the circular knitting machine, before the butt joint, when the first photoelectric switch detects that the tail end of the yarn passes, the driving source of the clamping block is controlled, so that the clamping block is closed to clamp the tail end of the yarn, the front yarn is prevented from losing tension and bending, the butt joint is affected, and the alignment block is used for aligning the tail end of the yarn with the new yarn end in parallel, and partial coarseness and burrs can be reduced by maintaining tension and bonding in parallel.
(2) The invention cuts the redundant thread after bonding by arranging the cutters, so as to keep the main thread clean and tidy, the tail end of the yarn horizontally extends during ultrasonic bonding, the new thread end is stuck with the tail end of the yarn in a V shape during pressing, the cutters are screwed in from front and back directions respectively and pressed into the gap, the bent cutters cut off the stuck part from the tail end of the yarn, and the other cutters cut off the stuck part from the new thread end.
Drawings
The accompanying drawings are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate the invention and together with the embodiments of the invention, serve to explain the invention. In the drawings:
FIG. 1 is a schematic view of the internal structure of the present invention;
FIG. 2 is a top view of the yarn feeding mechanism of the present invention;
FIG. 3 is a schematic view of a docking mechanism of the present invention;
FIG. 4 is a top view of the cutter and slider drive relationship of the present invention;
FIG. 5 is a side view of the cutter and turning bar configuration of the present invention;
FIG. 6 is a side view of the clamping mechanism of the present invention;
FIG. 7 is a top view of the clamping mechanism of the present invention;
in the figure: 1. knitting circular machine; 2. a creel; 3. a yarn feeding mechanism; 31. a driving wheel; 32. a drive chain; 33. a fixed rod; 34. a rotating member; 35. a clamping rod; 36. a yarn drum; 41. a side plate; 42. a cylinder; 43. an ultrasonic bonder; 44. a yarn storage device; 5. a docking mechanism; 51. u-shaped groove blocks; 52. a first photoelectric switch; 53. a clamping block; 54. a sliding block; 55. an alignment block; 56. a rotating rod; 57. a protruding rod; 58. a cutter; 59. a knife slot; 6. a clamping mechanism; 61. a mechanical arm; 62. a substrate; 63. a clamping plate; 64. a telescopic cylinder; 65. a second photoelectric switch; 66. and (3) driving wheels.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Examples: as shown in fig. 1-7, a forming knitting machine for making seamless down jacket fabric comprises a circular knitting machine 1 and a creel 2, wherein a yarn feeding mechanism 3 is arranged in the creel 2, a butt joint mechanism 5 and a clamping mechanism 6 are arranged on the side surface of the creel 2 through a side plate 41, and an air cylinder 42 and an ultrasonic bonder 43 are further arranged on the surface of the side plate 41.
The yarn feeding mechanism 3 circularly feeds the yarn cylinder 36 through the driving wheel 31 and the transmission chain 32, the surface of the transmission chain 32 is provided with the fixed rod 33, the end part of the fixed rod 33 is rotationally connected with the rotating piece 34, the side surface of the rotating piece 34 is provided with the clamping rod 35 for clamping the yarn cylinder 36, the yarn feeding mechanism 3 circularly feeds the yarn cylinder 36 to the front end of the docking mechanism 5, the yarn cylinder 36 is fixed on the outer surface of the clamping rod 35 through clamping, the fixation and the detachment are convenient, and the clamping rod 35 is connected with the fixed rod 33 through the rotating piece 34, so that the yarn cylinder 36 can rotate and pay off under the tensile force.
The butt joint mechanism 5 comprises a U-shaped groove block 51 fixed on the surface of the side plate 41, a first photoelectric switch 52, a clamping block 53 with a driving source, a cutting assembly and an alignment block 55 are sequentially arranged on the inner side surface of the U-shaped groove block 51 according to the yarn moving direction, the first photoelectric switch 52 is electrically connected with the driving source of the clamping block 53, the cutting assembly comprises two cutters 58 and a cutter groove 59 for accommodating the cutters 58, the cutters 58 take a rotating rod 56 as an axis, the rotating rod 56 is arranged in the U-shaped groove block 51, a protruding rod 57 is arranged at the end part of the rotating rod 56, a sliding block 54 for pushing the protruding rod 57 is arranged on the side wall of the U-shaped groove block 51, and the output end of the air cylinder 42 moves downwards to push the sliding block 54 to slide so that the cutters 58 rotate out of the cutter groove 59.
The butt joint mechanism 5 is used for butt joint of the tail end of the yarn and the thread end of a new yarn cylinder 36, butt joint can be completed in the process of not affecting the operation of the circular knitting machine 1, before butt joint, when the first photoelectric switch 52 detects that the tail end of the yarn passes, the driving source of the clamping block 53 is controlled, the clamping block 53 is closed to clamp the tail end of the yarn, the front yarn is prevented from losing tension and bending, butt joint is affected, the alignment block 55 is used for horizontally aligning the tail end of the yarn with the new thread end to keep the thread end in an up-down parallel alignment, butt joint is convenient, the ultrasonic bonder 43 is driven by the air cylinder 42 to move downwards, the yarn is fused in a small section range, meanwhile, the ultrasonic bonder 43 pushes the sliding block 54 to slide inwards, the sliding block 54 pushes the rotating rod 56 to rotate, and the cutter 58 is rotated out to cut redundant thread ends.
The clamping mechanism 6 comprises a mechanical arm 61 fixed on the surface of the side plate 41, the mechanical arm 61 is controlled by a PLC, the end part of the mechanical arm 61 is provided with a base plate 62 and a clamping plate 63 which are mutually hinged, the clamping plate 63 is driven by a telescopic cylinder 64, the side surface of the base plate 62 is also provided with a second photoelectric switch 65 and a driving wheel 66 for driving the yarn barrel 36 to rotate, and the second photoelectric switch 65 and the telescopic cylinder 64 are electrically connected with the PLC.
The clamping mechanism 6 is used for clamping the thread ends in the new yarn barrel 36 and pulling the thread ends to be aligned in parallel in the U-shaped groove block 51, wherein the mechanical arm 61 enables the base plate 62 to be attached to the yarn on the surface of the yarn barrel 36, then the driving wheel 66 is contacted with the exposed end of the yarn barrel 36 to drive the yarn barrel 36 to rotate, the thread ends of the yarn barrel 36 are shoveled out by the base plate 62, the second photoelectric switch 65 detects the thread ends and sends a signal to the PLC, the telescopic cylinder 64 is enabled to clamp the thread ends in a closing mode, meanwhile, the mechanical arm 61 pulls the thread ends to penetrate through the U-shaped groove block 51 and fall into gaps of the sliding block 54 and the alignment block 55, the new thread ends are aligned in parallel with the yarn ends at intervals of 0.5cm-1cm, and the air cylinder 42 drives the ultrasonic bonder 43 to move downwards to press a small thread ends, and the new thread ends are bonded with the yarn ends.
Yarn is wound on the middle section of the outer surface of the main body of the yarn barrel 36, and two ends of the main body of the yarn barrel 36 are exposed outside, so that the driving wheel 66 can conveniently drive the yarn barrel 36 to rotate, and a thread end is searched.
The ultrasonic bonder 43 includes an ultrasonic generator and a bonding head for parallel butt-jointing the yarns, which can make the adhesion effect more, and prevent local coarseness and burrs.
The two knife grooves 59 are different in height, the horizontal height of the knife groove 59 near one end of the sliding block 54 is lower than that of the other knife groove 59, the knife 58 in the lower knife groove 59 is in a downward bending shape, the tail of the yarn horizontally extends during ultrasonic bonding, and a new thread end and the yarn are spaced by 0.5cm-1cm, so that the knife 58 is adhered to the tail of the yarn in a V shape during bonding, the knife 58 is screwed into a gap in the front and back directions respectively, the bent knife 58 cuts off the adhered part from the tail of the yarn, and the other knife 58 is used for cutting off the adhered part from the new thread end.
The side surfaces of the side plates 41 are also provided with yarn reservoirs 44 for passing yarn to the circular knitting machine 1.
The model of the photoelectric switch is KJT-FQ, the yarn storage device 44 and the ultrasonic bonder 43 are market existing devices, the ultrasonic bonder enables yarns to be melted at high speed in bonding positions, the yarns are cooled and bonded, the yarn storage device 44 is used for adjusting and stabilizing yarn feeding tension and consists of a yarn storage cylinder internally provided with a micro motor, the yarn storage cylinder rotates under the driving of the micro motor, a yarn layer is wound, the motor is controlled by an inclined ring on the yarn storage cylinder to switch on, when the yarn layer is reduced, the inclined ring descends, the switch is switched on, and the motor drives the yarn storage cylinder to rotate to wind yarns; when the yarn reaches a certain amount, the inclined ring is lifted, the switch is disconnected, and the yarn storage cylinder stops rotating, so that a certain amount of yarn layers are always kept on the yarn storage cylinder, the yarn unwinding condition is ensured to be consistent, the yarn feeding tension is uniform, and the yarn feeding is stable.
Specifically, when the yarn feeding mechanism is used, the yarn feeding mechanism 3 firstly conveys the yarn barrel 36 to a set position, then the mechanical arm 61 enables the base plate 62 to be attached to yarns on the surface of the yarn barrel 36, then the driving wheel 66 is contacted with the exposed end of the yarn barrel 36 to drive the yarn barrel 36 to rotate, the yarn end of the yarn barrel 36 is shoveled out by the base plate 62, the second photoelectric switch 65 detects the yarn end, the telescopic cylinder 64 is closed to clamp the yarn end, the mechanical arm 61 pulls the yarn end to penetrate through the U-shaped groove block 51 and fall into gaps of the sliding block 54 and the alignment block 55, the new yarn end is aligned with the tail end of the yarns in parallel, the gap between the new yarn end and the tail end of the yarns is 0.5cm-1cm, the air cylinder 42 drives the ultrasonic adhesive 43 to move downwards to press a small yarn end to bond the new yarn end, meanwhile, the sliding block 54 is pushed to slide inwards when the ultrasonic adhesive 43 moves downwards, the sliding block 54 pushes the rotary rod 56 to rotate, the rotary rod 58 to cut the redundant yarn end, the yarn ends are restored, and the yarn continues to be fed into the circular knitting machine 1 after butting.
Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made therein without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (6)
1. The utility model provides a make seamless down jacket for surface fabric shaping knitting machine, includes knitting circular knitting machine (1) and creel (2), its characterized in that, the inside of creel (2) is provided with yarn feeding mechanism (3), and the side surface of creel (2) is provided with docking mechanism (5) and clamp and get mechanism (6) through curb plate (41), and the surface of curb plate (41) still is provided with cylinder (42) and ultrasonic bonding ware (43), and wherein, yarn feeding mechanism (3) are through action wheel (31) and drive chain (32) to yarn section of thick bamboo (36) circulation supply;
the butt joint mechanism (5) comprises a U-shaped groove block (51) fixed on the surface of a side plate (41), a first photoelectric switch (52), a clamping block (53) with a driving source, a cutting assembly and an alignment block (55) are sequentially arranged on the inner side surface of the U-shaped groove block (51) according to the yarn moving direction, wherein the first photoelectric switch (52) is electrically connected with the driving source of the clamping block (53), the cutting assembly comprises two cutters (58) and a cutter groove (59) for accommodating the cutters (58), the cutters (58) take the rotating rod (56) as an axis, the rotating rod (56) is arranged in the U-shaped groove block (51), a protruding rod (57) is arranged at the end part of the rotating rod (56), a sliding block (54) for pushing the protruding rod (57) is arranged on the side wall of the U-shaped groove block (51), and the output end of the air cylinder (42) moves downwards to push the sliding block (54) to slide, so that the cutters (58) rotate out of the cutter groove (59);
the clamping mechanism (6) comprises a mechanical arm (61) fixed on the surface of the side plate (41), the mechanical arm (61) is controlled by a PLC, a base plate (62) and a clamping plate (63) which are mutually hinged are arranged at the end part of the mechanical arm (61), the clamping plate (63) is driven by a telescopic cylinder (64), a second photoelectric switch (65) and a driving wheel (66) used for driving the yarn bobbin (36) to rotate are further arranged on the side surface of the base plate (62), and the second photoelectric switch (65) and the telescopic cylinder (64) are electrically connected with the PLC.
2. The knitting machine for producing seamless down jacket fabric according to claim 1, characterized in that the surface of the transmission chain (32) is provided with a fixed rod (33), the end part of the fixed rod (33) is rotatably connected with a rotating member (34), and the side surface of the rotating member (34) is provided with a clamping rod (35) for clamping a yarn cylinder (36).
3. The knitting machine for producing a seamless down jacket fabric according to claim 1, characterized in that the yarn is wound around the middle section of the outer surface of the main body of the yarn cylinder (36), and both ends of the main body of the yarn cylinder (36) are exposed.
4. A knitting machine for producing seamless down jackets according to claim 1, characterized in that the ultrasonic bonder (43) comprises an ultrasonic generator and an adhesive head for parallel butt-jointing of the yarns.
5. A knitting machine for making seamless down jacket fabric according to claim 1, characterized in that the two knife grooves (59) are different in height, the knife groove (59) near one end of the sliding block (54) is lower in level than the other knife groove (59), and the knife (58) inside the lower one of the knife grooves (59) is bent downward.
6. A machine for producing seamless down jackets according to claim 1, characterized in that the side surfaces of the side plates (41) are also provided with yarn reservoirs (44) for yarn transition to the circular knitting machine (1).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210506384.9A CN114808256B (en) | 2022-05-11 | 2022-05-11 | Forming knitting machine for manufacturing seamless down jacket fabric |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210506384.9A CN114808256B (en) | 2022-05-11 | 2022-05-11 | Forming knitting machine for manufacturing seamless down jacket fabric |
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| Publication Number | Publication Date |
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| CN114808256A CN114808256A (en) | 2022-07-29 |
| CN114808256B true CN114808256B (en) | 2023-06-30 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202210506384.9A Active CN114808256B (en) | 2022-05-11 | 2022-05-11 | Forming knitting machine for manufacturing seamless down jacket fabric |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB874888A (en) * | 1956-12-06 | 1961-08-10 | Burlington Industries Inc | Yarn handling and severing mechanism for circular knitting machines and methods |
| CN209619572U (en) * | 2019-08-24 | 2019-11-12 | 绍兴美科针纺有限公司 | A kind of Yarn-feeding mechanism of large circle machine |
| CN112981690A (en) * | 2021-03-15 | 2021-06-18 | 福建泳力泰针织机械有限公司 | High-stability transmission system of circular knitting machine |
| CN113023484A (en) * | 2021-03-03 | 2021-06-25 | 福建泳力泰针织机械有限公司 | Improved yarn feeding mechanism of circular knitting machine |
| CN113026189A (en) * | 2021-03-15 | 2021-06-25 | 福建泳力泰针织机械有限公司 | High intelligent three-line sweater machine |
| CN113774554A (en) * | 2021-10-20 | 2021-12-10 | 绍兴小蟋蟀纺织品有限公司 | Yarn feeding frame of large circular knitting machine |
-
2022
- 2022-05-11 CN CN202210506384.9A patent/CN114808256B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB874888A (en) * | 1956-12-06 | 1961-08-10 | Burlington Industries Inc | Yarn handling and severing mechanism for circular knitting machines and methods |
| CN209619572U (en) * | 2019-08-24 | 2019-11-12 | 绍兴美科针纺有限公司 | A kind of Yarn-feeding mechanism of large circle machine |
| CN113023484A (en) * | 2021-03-03 | 2021-06-25 | 福建泳力泰针织机械有限公司 | Improved yarn feeding mechanism of circular knitting machine |
| CN112981690A (en) * | 2021-03-15 | 2021-06-18 | 福建泳力泰针织机械有限公司 | High-stability transmission system of circular knitting machine |
| CN113026189A (en) * | 2021-03-15 | 2021-06-25 | 福建泳力泰针织机械有限公司 | High intelligent three-line sweater machine |
| CN113774554A (en) * | 2021-10-20 | 2021-12-10 | 绍兴小蟋蟀纺织品有限公司 | Yarn feeding frame of large circular knitting machine |
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| CN114808256A (en) | 2022-07-29 |
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