Folding packaging machine and method based on anti-mosquito and anti-bacterial polyester yarn processing for home use

By designing an automatic folding and packaging machine for polyester yarn, and utilizing winding, folding, and conveying mechanisms, the problem of polyester yarn packaging relying on manual labor was solved, achieving automated operation, reducing labor costs, and improving efficiency.

CN119660093BActive Publication Date: 2025-10-21杭州聚乾实业有限公司
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Patent Information

Application Number
CN202411902309.X
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2024-12-23
Publication Date
2025-10-21
Estimated Expiration
2044-12-23

AI Technical Summary

Technical Problem

The existing polyester yarn folding and packaging device relies on manual operation, which increases labor costs and has general practicality.

Method used

A folding packaging machine based on anti-mite, anti-mosquito, and antibacterial polyester yarn for home use was designed. It includes a winding mechanism, a folding mechanism, and a conveying mechanism. Through the cooperation of cylinders, hooks, and springs, the machine automatically completes the winding, folding, and conveying of polyester yarn, reducing manual intervention.

Benefits of technology

It enables automatic folding and conveying of polyester yarn, reducing labor costs and improving work efficiency and practicality.

✦ Generated by Eureka AI based on patent content.

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Abstract

The application discloses a folding packaging machine and method based on household anti-mite and anti-mosquito antibacterial polyester yarn processing, which comprises a base and relates to the technical field of polyester yarn processing folding. The folding packaging machine and method based on household anti-mite and anti-mosquito antibacterial polyester yarn processing can fold the polyester yarn through the hook and the folding groove. When in use, the cylinder is started to drive the connecting frame to move the groove plate and the side plate forward, then the hook contacts the outer side of the polyester yarn and folds backward, meanwhile, the inclined block also contacts the outer side of the polyester yarn and shrinks into the groove, when the hook and the inclined block leave the outer side of the polyester yarn, the elastic force of the second spring and the first spring drives the hook and the inclined block to reset, then the cylinder is started again to drive the connecting frame to reset, and the hook and the inclined block take down the polyester yarn wound on the winding roller. At this time, the hook hooks the polyester yarn, the limiting plate limits the polyester yarn to be pulled into the folding groove to be folded, so that the operation is convenient and fast, the labor cost is reduced, and the practicability is good.
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Description

Technical Field

[0001] The invention relates to the technical field of polyester yarn processing and folding, in particular to a folding packaging machine and a method based on the processing of household anti-mite, anti-mosquito and antibacterial polyester yarn. Background Art

[0002] Polyester yarn refers to yarn spun from polyester. Polyester, also known as polyester fiber, is a type of polymer made by spinning. Currently, it is commonly known as polyester in my country. Polyester yarn needs to be stored after production.

[0003] Reference is made to a patent application with publication number CN214934828U, which discloses a yarn anti-winding device for polyester production. This utility model facilitates the guidance of winding the polyester yarn through the connection of the limit groove and the support spring, effectively reduces the possibility of the polyester yarn getting knotted during the winding process, and improves the winding efficiency of the equipment. Under the action of the telescopic groove, it is convenient to separate the support cylinder and the insertion rod on the surface of the limit plate, thereby facilitating the disassembly of the rotating cylinder on the support plate, thereby improving the winding efficiency of the equipment.

[0004] However, the above-mentioned technical device uses a rotating drum to roll and store the polyester yarn, and the existing storage method includes rolling and storing the polyester yarn through a rotating drum, and another storage method is to fold the polyester yarn in half for storage and packaging. Although this folding packaging method saves storage space to a certain extent, its operation process often relies on manual folding and subsequent packaging work, which increases labor costs and is generally not practical. Summary of the Invention

[0005] In response to the shortcomings of the existing technology, the present invention provides a folding packaging machine and method based on the processing of anti-mite, anti-mosquito and antibacterial polyester yarn for household use, which solves the problem that the existing polyester yarn folding packaging device often relies on manual folding before subsequent packaging work, which increases labor costs and has poor practicality.

[0006] To achieve the above objectives, the present invention is implemented through the following technical solutions: a folding packaging machine based on the processing of anti-mite, anti-mosquito and antibacterial polyester yarn for household use, comprising a base, on the right side of the top surface of the base is fixedly installed a packaging device for packaging the folded polyester yarn;

[0007] a winding mechanism, disposed on the top surface of the base and used for winding the polyester yarn;

[0008] A folding mechanism is provided on the top surface of the base for folding the polyester yarn in half. The folding mechanism includes a mounting frame fixedly mounted on the top surface of the base, a cylinder fixedly mounted on the top surface of the mounting frame, a material taking assembly provided at the output end of the cylinder for removing the polyester yarn, and two folding plates for folding the polyester yarn in half are fixed to the front side of the mounting frame, folding grooves are provided on opposite sides of the two folding plates, and limit plates for limiting the position of the polyester yarn are fixedly mounted on the bottom surfaces of the two folding plates;

[0009] The conveying mechanism is arranged on the bottom surface of the base and is used to convey the folded polyester yarn for subsequent packaging.

[0010] Preferably, the material-taking assembly includes a connecting frame fixedly mounted on the output end of the cylinder, a slot plate fixedly mounted on the bottom surface of the connecting frame, a hook for removing the polyester yarn is movably hinged at the front end of the bottom surface of the inner cavity of the slot plate, a second spring is fixedly mounted on the rear side of the hook, side panels are fixedly mounted on the left and right ends of the bottom surface of the connecting frame, slots are provided at the front ends of the opposite sides of the side panels, an inclined block is movably mounted inside the slot, and a first spring is fixedly mounted on one side of the inclined block.

[0011] Preferably, the rear end of the second spring is fixedly mounted on the top surface of the inner cavity of the slot plate, the hook is located between the folding slots, the opposite side of the inclined block moves through the interior of the slot and extends to the interior of the side plate, and one end of the first spring is fixedly mounted on the inner side of the slot.

[0012] Preferably, the winding mechanism includes a placement seat fixedly mounted on the left side of the top surface of the base for placing polyester yarn, a wire ring for guiding the polyester yarn pay-off trajectory is fixedly mounted on the top surface of the base, a rear plate is fixedly mounted on the rear side of the top surface of the base, a turntable is movably mounted on the front side of the rear plate, winding rollers for winding polyester yarn are fixedly mounted on the left and right sides of the front side of the turntable, and a drive motor is fixedly mounted on the rear side of the rear plate.

[0013] Preferably, the output end of the driving motor movably passes through the rear side of the rear plate and is fixedly mounted on the rear side of the turntable.

[0014] Preferably, the conveying mechanism includes a movable groove opened on the top surface of the base, a screw is movably installed inside the movable groove, a DC motor is fixedly installed on the right side of the base, a limiting frame is fixedly installed on the top surface of the base, a placement box for placing the folded polyester yarn is movably installed on the top surface of the base, and a guide bucket is fixedly installed on the top surface of the limiting frame for guiding the falling trajectory of the folded polyester yarn.

[0015] Preferably, the bottom surface of the placement box is slidably installed inside the movable groove, the right end of the screw rod movably passes through the inside of the movable groove and is fixedly installed at the output end of the DC motor, and the left end of the screw rod threadably passes through the right side of the placement box and is movably installed inside the movable groove.

[0016] The present invention also discloses a process for a folding packaging machine based on the processing of household anti-mite, anti-mosquito and antibacterial polyester yarn, which specifically includes the following steps:

[0017] Step 1: Place the polyester yarn on the top of the winding mechanism, and then start the winding mechanism to wind the polyester yarn into an oval flat shape;

[0018] Step 2: Then start the cylinder to drive the material taking component to move forward and pass through the polyester line. Then the material taking component will reset and hook the wound polyester yarn and remove it from the winding mechanism. When the material taking component resets, it will drive the polyester yarn into the folding groove to be folded in half;

[0019] Step 3: The polyester yarn folded in half by the folding mechanism will fall into the interior of the conveying mechanism, and then the conveying mechanism is started to drive the folded polyester yarn to be conveyed to the interior of the packaging device for packaging.

[0020] The present invention provides a folding packaging machine and method based on the processing of anti-mite, anti-mosquito and antibacterial polyester yarn for household use. Compared with the existing technology, it has the following advantages:

[0021] 1. The folding packaging machine and method based on the processing of anti-mite, anti-mosquito and antibacterial polyester yarn for household use can fold the polyester yarn in half through the provided hook and folding groove. When in use, the cylinder is started to drive the connecting frame to move the groove plate and the side plate forward, and then the hook will contact the outside of the polyester yarn and fold backward. At the same time, the oblique block will also contact the outside of the polyester yarn and shrink into the groove. When the hook and the oblique block leave the outside of the polyester yarn, the elastic force of the second spring and the first spring will drive the hook and the oblique block to reset, and then the cylinder is started to drive the connecting frame to reset, at this time, the polyester yarn wrapped on the winding roller can be removed, and then the polyester yarn will be separated from the outside of the oblique block after removal. At this time, the polyester yarn will be hooked by the hook and the limited position of the limit plate and pulled into the inside of the folding groove for folding. It is convenient and fast, reduces labor costs, and has good practicality.

[0022] 2. The folding packaging machine and method for processing household anti-mite, anti-mosquito and antibacterial polyester yarn facilitates the winding of the polyester yarn into shape through the provided placement seat and winding roller. When in use, the polyester yarn is placed on the bottom surface of the placement seat, and then one end of the polyester yarn is passed through the wire ring and fixed on the outside of the winding roller. Then, the driving motor is started to drive the turntable to wind the polyester yarn into shape through the winding roller. The structure is simple and convenient.

[0023] 3. The folding packaging machine and method based on the processing of anti-mite, anti-mosquito and antibacterial polyester yarn for household use facilitates the transportation of the folded polyester yarn to the subsequent process for packaging through the provided placement box and guide bucket. The folded polyester yarn will fall into the placement box through the restriction of the guide bucket. When the placement box is full of folded polyester yarn, the DC motor is started to drive the screw to rotate, so that the placement box moves to the right and enters the interior of the packaging device for packaging processing, thereby improving work efficiency and having good practicality. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic diagram of the three-dimensional appearance of the present invention;

[0025] Figure 2 This is a schematic diagram of the three-dimensional appearance of the winding mechanism of the present invention;

[0026] Figure 3 It is a schematic diagram of the three-dimensional appearance of the conveying mechanism of the present invention;

[0027] Figure 4 This is a schematic diagram of the three-dimensional appearance of the folding mechanism of the present invention;

[0028] Figure 5 It is a schematic diagram of the three-dimensional appearance of the conveying mechanism of the present invention;

[0029] Figure 6 It is a schematic diagram of the sectional three-dimensional appearance of the folding mechanism of the present invention.

[0030] In the figure: 1-base, 2-winding mechanism, 21-placement seat, 22-wire ring, 23-back plate, 24-drive motor, 25-turntable, 26-winding roller, 3-folding mechanism, 31-cylinder, 32-mounting frame, 33-connecting frame, 34-slot plate, 35-side plate, 36-folding plate, 37-hook, 38-oblique block, 39-folding slot, 310-limiting plate, 311-notch, 312-first spring, 313-second spring, 4-conveying mechanism, 41-DC motor, 42-movable slot, 43-screw, 44-placement box, 45-guide bucket, 46-limiting frame, 5-packing device. DETAILED DESCRIPTION

[0031] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0032] See Figures 1-6 , the present invention provides three technical solutions:

[0033] The first embodiment: a folding packaging machine based on the processing of anti-mite, anti-mosquito and antibacterial polyester yarn for household use, comprising a base 1, a packing device 5 for packing the folded polyester yarn is fixedly installed on the right side of the top surface of the base 1, and the packing device 5 is an existing device for packing the folded polyester yarn, which will not be described in detail here;

[0034] A winding mechanism 2 is provided on the top surface of the base 1 and is used for winding polyester yarn;

[0035] The folding mechanism 3 is provided on the top surface of the base 1 for folding the polyester yarn in half. The folding mechanism 3 includes a mounting frame 32 fixedly mounted on the top surface of the base 1. A cylinder 31 is fixedly mounted on the top surface of the mounting frame 32. A material taking assembly is provided at the output end of the cylinder 31 for removing the polyester yarn. Two folding plates 36 for folding the polyester yarn in half are fixed to the front side of the mounting frame 32. Folding grooves 39 are provided on opposite sides of the two folding plates 36, and the cross-section of the folding grooves 39 is triangular. Limiting plates 310 for limiting the position of the polyester yarn are fixedly mounted on the bottom surfaces of the two folding plates 36, and the front sides of the top surfaces of the limiting plates 310 are inclined.

[0036] The conveying mechanism 4 is arranged on the bottom surface of the base 1 for conveying the folded polyester yarn for subsequent packaging. The material taking component includes a connecting frame 33 fixedly mounted on the output end of the cylinder 31. The bottom surface of the connecting frame 33 is fixedly mounted with a slot plate 34. The front end of the bottom surface of the inner cavity of the slot plate 34 is movably hinged with a hook 37 for removing the polyester yarn. The rear side of the hook 37 is fixedly mounted with a second spring 313. The left and right ends of the bottom surface of the connecting frame 33 are fixedly mounted with side plates 35. The front ends of the opposite sides of the side plates 35 are each provided with a slot 311. The inside of the slot 311 is movably mounted with an inclined block 38, and the inclined block 38 is movably mounted. The front side of the block 38 is inclined, and a first spring 312 is fixedly installed on one side of the inclined block 38. The rear end of the second spring 313 is fixedly installed on the top surface of the inner cavity of the slot plate 34, and the position of the hook 37 can be fixed by the elastic force of the second spring 313. The hook 37 is located between the folding grooves 39. The opposite side of the inclined block 38 is movable through the interior of the slot 311 and extends to the interior of the side plate 35. One end of the first spring 312 is fixedly installed on the inner side of the slot 311, and the elastic force of the first spring 312 can be used to reset it after passing through the polyester yarn so that it is located on the rear side of the polyester yarn.

[0037] When the hook 37 and the inclined block 38 leave the outer side of the polyester yarn, the elastic force of the second spring 313 and the first spring 312 will drive the hook 37 and the inclined block 38 to return to their original position, and then the cylinder 31 will be started to drive the connecting frame 33 to return to its original position. At this time, the polyester yarn wrapped on the winding roller 26 can be removed by the hook 37 and the inclined block 38. After being removed, the polyester yarn will be separated from the outer side of the inclined block 38. At this time, the polyester yarn will be hooked by the hook 37 and the limited position of the limiting plate 310 and pulled into the inside of the folding groove 39 for folding in half, which is convenient and fast, reduces labor cost and has good practicality.

[0038] The second embodiment is mainly different from the first embodiment in that: the winding mechanism 2 includes a placement seat 21 fixedly mounted on the left side of the top surface of the base 1 for placing polyester yarn, a wire ring 22 for guiding the polyester yarn pay-off trajectory is fixedly mounted on the top surface of the base 1, a rear plate 23 is fixedly mounted on the rear side of the top surface of the base 1, a turntable 25 is movably mounted on the front side of the rear plate 23, and winding rollers 26 for winding polyester yarn are fixedly mounted on the left and right sides of the front side of the turntable 25, a driving motor 24 is fixedly mounted on the rear side of the rear plate 23, the output end of the driving motor 24 movably passes through the rear side of the rear plate 23 and is fixedly mounted on the rear side of the turntable 25, and starting the driving motor 24 can drive the turntable 25 to rotate the winding roller 26, and then the winding roller 26 will wind the polyester yarn, which is convenient and quick.

[0039] The placement seat 21 and the winding roller 26 are provided to facilitate winding the polyester yarn into shape. When in use, the polyester yarn is placed on the bottom surface of the placement seat 21, and then one end of the polyester yarn is passed through the wire ring 22 and fixed on the outside of the winding roller 26. Then, the driving motor 24 is started to drive the turntable 25 to wind the polyester yarn through the winding roller 26 to form it. The structure is simple and convenient.

[0040] The third embodiment is mainly different from the second embodiment in that: the conveying mechanism 4 includes a movable groove 42 opened on the top surface of the base 1, a screw 43 is movably installed inside the movable groove 42, a DC motor 41 is fixedly installed on the right side of the base 1, a limiting frame 46 is fixedly installed on the top surface of the base 1, a placement box 44 for placing the folded polyester yarn is movably installed on the top surface of the base 1, and a guide bucket 45 for guiding the falling trajectory of the folded polyester yarn is fixedly installed on the top surface of the limiting frame 46. The bottom surface of the placement box 44 is slidably installed in the movable groove 42, the right end of the screw 43 movably passes through the inside of the movable groove 42 and is fixedly installed at the output end of the DC motor 41, the left end of the screw 43 threadedly passes through the right side of the placement box 44 and is movably installed in the movable groove 42, and starting the DC motor 41 can drive the screw 43 to rotate so that the placement box 44 drives the folded polyester yarn to move horizontally into the packaging device 5 for packaging operation.

[0041] The placement box 44 and the guide bucket 45 are provided to facilitate the transportation of the folded polyester yarn to the subsequent process for packaging. The folded polyester yarn will fall into the placement box 44 through the restriction of the guide bucket 45. When the placement box 44 is full of the folded polyester yarn, the DC motor 41 is started to drive the screw 43 to rotate so that the placement box 44 moves to the right and enters the interior of the packaging device 5 for packaging processing, which improves work efficiency and has good practicality.

[0042] The present invention also discloses a method for using a folding packaging machine based on the processing of household anti-mite, anti-mosquito and antibacterial polyester yarn, which specifically includes the following steps:

[0043] Step 1: Place the polyester yarn on the bottom surface of the placement seat 21, then pass one end of the polyester yarn through the wire ring 22 and fix it on the outside of the winding roller 26, then start the drive motor 24 to drive the turntable 25 to wind the polyester yarn through the winding roller 26 to form it;

[0044] When the hook 37 and the oblique block 38 leave the outside of the polyester yarn, the elastic force of the second spring 313 and the first spring 312 will drive the hook 37 and the oblique block 38 to reset, and then the cylinder 31 is started to drive the connecting frame 33 to reset. At this time, the polyester yarn wrapped on the winding roller 26 can be removed by the hook 37 and the oblique block 38. After being removed, the polyester yarn will be separated from the outer side of the oblique block 38. At this time, the polyester yarn will be hooked by the hook 37 and pulled into the inside of the folding groove 39 through the limit of the limit plate 310 for folding. When the folding is completed, the polyester yarn will be separated from the top surface of the limit plate 310.

[0045] Step 3: At this time, the yarn falls into the placement box 44 through the restriction of the guide bucket 45. When the placement box 44 is full of folded polyester yarn, the DC motor 41 is started to drive the screw 43 to rotate so that the placement box 44 moves to the right and enters the packaging device 5 for packaging.

[0046] Meanwhile, the contents not described in detail in this specification belong to the prior art known to those skilled in the art.

[0047] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that includes a list of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus.

[0048] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A folding packaging machine based on household anti-mite, anti-mosquito and antibacterial polyester yarn, comprising a base (1), characterized in that: A packing device (5) for packing the folded polyester yarn is fixedly mounted on the right side of the top surface of the base (1); A winding mechanism (2) is arranged on the top surface of the base (1) and is used for winding polyester yarn; A folding mechanism (3) is provided on the top surface of the base (1) for folding the polyester yarn in half. The folding mechanism (3) comprises a mounting frame (32) fixedly mounted on the top surface of the base (1). A cylinder (31) is fixedly mounted on the top surface of the mounting frame (32). A material taking assembly is provided at the output end of the cylinder (31) for removing the polyester yarn. Two folding plates (36) for folding the polyester yarn in half are fixed on the front side of the mounting frame (32). Folding grooves (39) are provided on opposite sides of the two folding plates (36), and the cross section of the folding grooves (39) is triangular. Limiting plates (310) for limiting the position of the polyester yarn are fixedly mounted on the bottom surfaces of the two folding plates (36), and the front side of the top surface of the limiting plates (310) is inclined. A conveying mechanism (4) is provided on the bottom surface of the base (1) and is used to convey the folded polyester yarn for subsequent packaging; The material taking assembly comprises a connecting frame (33) fixedly mounted on the output end of the cylinder (31), a slot plate (34) fixedly mounted on the bottom surface of the connecting frame (33), a hook (37) for removing the polyester yarn movably hinged at the front end of the bottom surface of the inner cavity of the slot plate (34), a second spring (313) fixedly mounted on the rear side of the hook (37), side plates (35) fixedly mounted on the left and right ends of the bottom surface of the connecting frame (33), and slots (311) are provided at the front ends of the opposite sides of the side plates (35). An inclined block (38) is movably installed inside the notch (311), a first spring (312) is fixedly installed on one side of the inclined block (38), a rear end of the second spring (313) is fixedly installed on the top surface of the inner cavity of the slot plate (34), the hook (37) is located between the folding grooves (39), the opposite side of the inclined block (38) movably passes through the interior of the notch (311) and extends to the interior of the side plate (35), and one end of the first spring (312) is fixedly installed on the inner side of the notch (311); The conveying mechanism (4) includes a movable groove (42) provided on the top surface of the base (1), a screw (43) is movably mounted inside the movable groove (42), a DC motor (41) is fixedly mounted on the right side of the base (1), a limiting frame (46) is fixedly mounted on the top surface of the base (1), a placement box (44) for placing the folded polyester yarn is movably mounted on the top surface of the base (1), and a guide bucket (45) for guiding the falling trajectory of the folded polyester yarn is fixedly mounted on the top surface of the limiting frame (46).

2. The folding packaging machine based on the processing of household anti-mite, anti-mosquito and antibacterial polyester yarn according to claim 1, characterized in that: The winding mechanism (2) comprises a placement seat (21) fixedly mounted on the left side of the top surface of the base (1) for placing polyester yarn, a wire ring (22) for guiding the polyester yarn pay-off track fixedly mounted on the top surface of the base (1), a rear plate (23) fixedly mounted on the rear side of the top surface of the base (1), a turntable (25) movably mounted on the front side of the back plate (23), winding rollers (26) for winding polyester yarn fixedly mounted on the left and right sides of the front side of the turntable (25), and a drive motor (24) fixedly mounted on the rear side of the back plate (23).

3. The folding packaging machine based on the processing of household anti-mite, anti-mosquito and antibacterial polyester yarn according to claim 2, characterized in that: The output end of the driving motor (24) movably passes through the rear side of the rear plate (23) and is fixedly mounted on the rear side of the turntable (25).

4. The folding packaging machine based on the processing of household anti-mite, anti-mosquito and antibacterial polyester yarn according to claim 1, characterized in that: The bottom surface of the placement box (44) is slidably mounted inside the movable groove (42), the right end of the screw rod (43) movably penetrates the inside of the movable groove (42) and is fixedly mounted on the output end of the DC motor (41), and the left end of the screw rod (43) is threadedly mounted on the right side of the placement box (44) and movably mounted inside the movable groove (42).

5. A method for using the folding packaging machine for processing household anti-mite, anti-mosquito and antibacterial polyester yarn according to any one of claims 1 to 4, characterized in that: The specific steps include: Step 1: Place the polyester yarn on top of the winding mechanism (2), and then start the winding mechanism (2) to wind the polyester yarn into an oval flat shape; Step 2: Then, the cylinder (31) is activated to drive the material taking component to move forward and pass through the polyester line. Then, the material taking component is reset to hook the wound polyester yarn and remove it from the winding mechanism (2). When the material taking component is reset, the polyester yarn is driven into the folding groove (39) to be folded in half. Step 3: The polyester yarn folded in half by the folding mechanism (3) falls into the interior of the conveying mechanism (4), and then the conveying mechanism (4) is started to drive the folded polyester yarn to be conveyed to the interior of the packaging device (5) for packaging.

Citation Information

Patent Citations

  • Yarn anti-winding device for polyester production

    CN214934828U

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