Precise feeding device for core yarn of polyester core-spun yarn

Abstract

The present application relates to the field of air jet vortex spinning production, and discloses a core yarn precision feeding device for polyester core-spun yarn, which comprises a frame body, a core yarn unwinding mechanism and a replacement mechanism are arranged on the frame body, the core yarn unwinding mechanism comprises a top frame, a connecting frame, a servo motor one, a bottom frame, a rotating disc one, a butt joint block one, a core yarn roll one and a rotating disc two, the top frame is fixedly connected with the connecting frame at the bottom, the servo motor one is fixedly installed on the connecting frame, the output end of the servo motor one is fixedly connected with the bottom frame, the bottom frame is fixedly connected with the rotating disc one at the bottom, the butt joint block one is fixedly connected with the core yarn roll one, the rotating disc two is rotatably installed on the frame body, and two butt joint blocks one are respectively clamped with the rotating disc one and the rotating disc two, and the core yarn unwinding mechanism is used in cooperation with the replacement mechanism, the present application has the following advantages and effects: the replacement of the core yarn roll is automatically completed, manual dismounting and carrying of the core yarn roll are not needed in the whole process, and the replacement downtime is greatly shortened.

Description

Technical Field

[0001] This invention relates to the field of air jet spinning technology, and in particular to a device for precise feeding of core yarn for polyester core-spun yarn. Background Technology

[0002] Core-spun yarn is a composite yarn consisting of a core yarn and a sheath yarn. It typically uses filament yarn as the core yarn and staple fiber as the outer sheath yarn. Its characteristic is that by combining the outer sheath yarn with the core yarn, the advantages of each can be brought into play, the shortcomings of both can be compensated, the strengths can be maximized and the weaknesses can be minimized, and the structure and characteristics of the yarn can be optimized.

[0003] Application No. 201320685811.0 discloses a core yarn feeding device for vortex spinning core-spun yarn, including a guide tension frame. The guide tension frame consists of four guide rollers: a rear guide roller, a middle rear guide roller, a middle front guide roller, and a front guide roller. The key feature is that an arc-shaped guide frame is positioned before the front guide roller on the guide tension frame. Compared with existing technologies, this invention has the following advantages: The vortex spinning core-spun yarn core yarn feeding device of this invention achieves stable tension control of the core yarn before feeding by adding an active yarn unwinding structure in conjunction with a tension frame device fixed on a cradle. Simultaneously, the spacing of the guide grooves on the guide tension frame can be adjusted according to actual spinning needs, thereby changing the tension of the core yarn. After being guided out by the tension frame, the core yarn passes through the arc-shaped guide frame and is fed between the front roller and the vortex spinning nozzle, achieving stability control before core yarn feeding, improving the core yarn coating effect, and improving yarn quality.

[0004] After the core yarn on the core yarn roll is used up, it needs to be replaced with a new core yarn. The existing replacement method is to manually remove the used core yarn roll and replace it with a new core yarn roll full of core yarn. The operation is cumbersome and requires a long downtime during replacement, which reduces the production efficiency of the equipment. Therefore, it is necessary to design a precise core yarn feeding device for polyester core-spun yarn to solve the above problems. Summary of the Invention

[0005] The purpose of this invention is to provide a device for precise feeding of core yarns for polyester core-spun yarn, so as to solve the above-mentioned problems.

[0006] The above-mentioned technical objective of the present invention is achieved through the following technical solution: a precise feeding device for core yarn of polyester core-spun yarn, comprising:

[0007] The frame is equipped with a core yarn unwinding mechanism and a replacement mechanism.

[0008] The core yarn unwinding mechanism includes a top frame, a connecting frame, a servo motor, a base frame, a turntable, a docking block, a core yarn roll, and a turntable.

[0009] The bottom of the top frame is fixedly connected to the connecting frame, the first servo motor is fixedly installed on the connecting frame, the output end of the first servo motor is fixedly connected to the base frame, the bottom of the base frame is fixedly connected to the first turntable, the first docking block is fixedly connected to the first core wire roll, the second turntable is rotatably installed on the frame, and the two first docking blocks are respectively engaged with the first turntable and the second turntable.

[0010] The core yarn unwinding mechanism is used in conjunction with the changing mechanism.

[0011] By adopting the above technical solution, the upper and lower sets of turntables provide bidirectional clamping and support for the core yarn roll, and with the help of a servo motor to provide stable power, the core yarn is unwound at a constant speed and tension, ensuring a constant core yarn conveying speed and meeting the requirements for precise core yarn feeding in the spinning process.

[0012] A further configuration of the present invention is as follows: the core yarn unwinding mechanism further includes a positioning block and a spring, the positioning block is vertically slidably mounted on a turntable, the positioning block is engaged with an upper docking block, and the spring is fixedly mounted between the positioning block and the base frame.

[0013] By adopting the above technical solution, the positioning block is moved down and engaged with the docking block by the continuous elastic force of the spring, thereby achieving axial locking of the core wire roll, preventing the core wire roll from moving up and down during unwinding, and ensuring that the feeding position remains accurate and unchanged.

[0014] A further configuration of the present invention is as follows: the replacement mechanism includes a second servo motor, a side frame, an electric telescopic rod, a push frame, a cross frame, a second docking block, and a second core wire roll. The second servo motor is fixedly mounted on the frame, and its output end is fixedly connected to the side frame. The electric telescopic rod is fixedly mounted on the side frame, and its output end is fixedly connected to the push frame. The cross frame is fixedly mounted on the push frame. The second docking block is engaged with the side frame, and the second core wire roll is fixedly connected to the second docking block.

[0015] By adopting the above technical solution, spare core yarn rolls can be stored in advance, and automatic roll replacement can be completed by relying on electric telescopic rods. There is no need for manual disassembly and replacement of the material rolls, which greatly reduces equipment downtime and improves spinning continuity.

[0016] A further feature of the present invention is that a plurality of wire guide rollers are rotatably connected to the frame.

[0017] By adopting the above technical solution, multiple sets of guide rollers limit and guide the core wire during conveying, preventing the core wire from swinging or deviating, and further improving the straightness and accuracy of the core wire feeding.

[0018] A further feature of the present invention is that both the first turntable and the second turntable are provided with a docking hole, and the first docking block is engaged with the docking hole.

[0019] By adopting the above technical solution and using a plug-in snap-fit ​​structure, disassembly and assembly are simple and quick, while ensuring that the turntable and the core wire roll rotate synchronously.

[0020] A further feature of the present invention is that the base frame has holes.

[0021] By adopting the above technical solution, passage space is reserved for the horizontal frame to move through, ensuring that the replacement mechanism can smoothly contact the positioning block and complete the unlocking action smoothly.

[0022] A further feature of the present invention is that the positioning block has a slanted hole.

[0023] By adopting the above technical solution and combining it with the inclined extrusion structure, the lateral thrust is converted into vertical lifting force, and the positioning block can be automatically lifted and unlocked without the need for additional driving components.

[0024] A further feature of the present invention is that a positioning groove is provided on the top of the docking block, and the positioning block is engaged with the positioning groove.

[0025] A further feature of the present invention is that the side of the crossbeam is provided with an inclined surface.

[0026] A further feature of the present invention is that: a horizontal hole is provided on the top of the side frame, the push frame is slidably installed in the horizontal hole, the side of the push frame is in contact with the second docking block, and a second docking hole is provided on the side frame, the second docking block is engaged with the second docking hole.

[0027] The beneficial effects of this invention are:

[0028] 1. The present invention uses a core yarn unwinding mechanism that relies on a servo motor to synchronously drive turntable one, core yarn roll one, and turntable two to rotate and unwind synchronously. Both ends are synchronously supported and limited, and the core yarn tension is uniform and stable during the unwinding process. The spring presses the positioning block into the positioning groove of the docking block one to achieve axial locking of the core yarn roll, so that there will be no slippage or deviation during spinning. With the help of multiple sets of guide rollers on the frame to guide the core yarn in a regular manner, the polyester core yarn can be continuously and accurately fed, improving the uniformity of core yarn coverage in core-spun yarn and optimizing the yarn quality.

[0029] 2. This invention utilizes a pre-installed replacement mechanism to store brand-new core yarn rolls inside the side frame. When the original core yarn roll is depleted, servo motor 2 aligns the side frame, and the electric telescopic rod pushes the cross frame to press and position the old roll, simultaneously pushing the new core yarn roll out of the empty roll, automatically completing the core yarn roll replacement. The entire process eliminates the need for manual disassembly and handling of the core yarn rolls, significantly reducing downtime during roll changes, lowering manual labor intensity, and enabling uninterrupted continuous production of jet-jet vortex spinning of core-spun yarn, effectively improving the overall production efficiency of the equipment. The overall structure is compact and interconnected, the automated roll-changing process is stable and reliable, and it is suitable for large-scale production line spinning operations of polyester core-spun yarn. Attached Figure Description

[0030] To more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings in the following description are merely exemplary. The structures, proportions, sizes, etc., drawn in this specification are only used to complement the content disclosed in the specification for those skilled in the art to understand and read, and are not intended to limit the conditions under which the present invention can be implemented. Therefore, they have no substantial technical significance, and any modification of the structure, change of the proportional relationship, or adjustment of the size is not permitted.

[0031] Figure 1 This is a schematic diagram of the structure of a precision core feeding device for polyester core-spun yarn proposed in this invention. Figure 1 .

[0032] Figure 2 This is a schematic diagram of the structure of a precision core feeding device for polyester core-spun yarn proposed in this invention. Figure 2 .

[0033] Figure 3 This is a schematic diagram of the structure of a precision core feeding device for polyester core-spun yarn proposed in this invention. Figure 3 .

[0034] Figure 4 This is a schematic diagram of the core yarn unwinding mechanism in a precision core yarn feeding device for polyester core-spun yarn proposed in this invention. Figure 1 .

[0035] Figure 5 This is a schematic diagram of the core yarn unwinding mechanism in a precision core yarn feeding device for polyester core-spun yarn proposed in this invention. Figure 2 .

[0036] Figure 6 This is a schematic diagram of the replacement mechanism in a precision feeding device for core yarn of polyester core-spun yarn proposed in this invention.

[0037] Figure 7 yes Figure 4 A schematic diagram of part A in the diagram.

[0038] Figure 8 yes Figure 5 A schematic diagram of part B in the diagram.

[0039] In the diagram: 1. Frame; 2. Core yarn unwinding mechanism; 21. Top frame; 22. Connecting frame; 23. Servo motor one; 24. Base frame; 25. Turntable one; 26. Docking hole one; 27. Docking block one; 28. Core yarn roll one; 29. ​​Turntable two; 210. Hole body; 211. Positioning block; 212. Spring; 213. Angled hole; 3. Changing mechanism; 31. Servo motor two; 32. Side frame; 33. Electric telescopic rod; 34. Push frame; 35. Horizontal frame; 36. Horizontal hole; 37. Docking hole two; 38. Docking block two; 39. Core yarn roll two; 4. Guide roller. Detailed Implementation

[0040] The following specific embodiments illustrate the implementation of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0041] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "circumferential," and "radial," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention.

[0042] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more unless otherwise explicitly specified.

[0043] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0044] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0045] See Figures 1-8 This invention provides a precise feeding device for core yarn in polyester core-spun yarn, comprising:

[0046] The frame 1 is equipped with a core yarn unwinding mechanism 2 and a changing mechanism 3.

[0047] The core yarn unwinding mechanism 2 includes a top frame 21, a connecting frame 22, a servo motor 23, a base frame 24, a turntable 25, a docking block 27, a core yarn roll 28, and a turntable 29;

[0048] The bottom of the top frame 21 is fixedly connected to the connecting frame 22. The servo motor 23 is fixedly installed on the connecting frame 22. The output end of the servo motor 23 is fixedly connected to the base frame 24. The bottom of the base frame 24 is fixedly connected to the turntable 25. The docking block 27 is fixedly connected to the core wire roll 28. The turntable 29 is rotatably installed on the frame 1. The two docking blocks 27 are respectively engaged with the turntable 25 and the turntable 29.

[0049] The core yarn unwinding mechanism 2 is used in conjunction with the changing mechanism 3.

[0050] With the above structure, servo motor 23 is started, which drives the base frame 24 to rotate. The base frame 24 drives turntable 25 to rotate. Turntable 25 drives core wire coil 28 to rotate through docking block 27. Core wire coil 28 drives turntable 29 to rotate through docking block 27. In this way, the core wire can be unwound and the core wire can be accurately fed in by the guiding action of guide roller 4.

[0051] Specifically, the core yarn unwinding mechanism 2 also includes a positioning block 211 and a spring 212. The positioning block 211 is vertically slidably mounted on the turntable 25 and is engaged with the upper docking block 27. The spring 212 is fixedly mounted between the positioning block 211 and the base frame 24.

[0052] Through the above structure, the spring 212 applies pressure to the positioning block 211, causing the positioning block 211 to engage with the docking block 27, thereby limiting the position of the docking block 27.

[0053] Specifically, the replacement mechanism 3 includes a second servo motor 31, a side frame 32, an electric telescopic rod 33, a push frame 34, a cross frame 35, a second docking block 38, and a second core wire roll 39. The second servo motor 31 is fixedly installed on the frame 1, and the output end of the second servo motor 31 is fixedly connected to the side frame 32. The electric telescopic rod 33 is fixedly installed on the side frame 32, and the output end of the electric telescopic rod 33 is fixedly connected to the push frame 34. The cross frame 35 is fixedly installed on the push frame 34. The second docking block 38 is engaged with the side frame 32, and the second core wire roll 39 is fixedly connected to the second docking block 38.

[0054] With the above structure, after the core wire roll 28 is used, the electric telescopic rod 33 is activated. The electric telescopic rod 33 drives the pusher 34 to move, and the pusher 34 drives the crossbeam 35 to move. The inclined surface on the crossbeam 35 will press against the inclined hole 213 on the positioning block 211, causing the positioning block 211 to move upward. The positioning block 211 compresses the spring 212, causing the positioning block 211 to move off the docking block 27, releasing the restriction on the core wire roll 28. The electric telescopic rod 33 continues to work, pushing... The frame 34 pushes the second docking block 38 to move, so that the second docking block 38 enters the first docking hole 26, and pushes the first docking block 27 out of the first docking hole 26. Then, the second docking block 38 is fully inserted into the first docking hole 26. Then, the electric telescopic rod 33 drives the pusher 34 to return to its original position, and the cross frame 35 separates from the positioning block 211. At this time, the spring 212 resets and drives the positioning block 211 to move down, so that the positioning block 211 is engaged with the first docking block 27, completing the quick replacement of the core wire coil.

[0055] Then start the servo motor 31 to make the side frame 32 rotate. Then put in a new core wire roll, and then the side frame 32 rotates back to its original position.

[0056] Specifically, multiple guide rollers 4 are rotatably connected to the frame 1.

[0057] The above structure is used to guide the core wire.

[0058] Specifically, both turntable 1 25 and turntable 2 29 are provided with docking holes 1 26, docking block 1 27 is engaged with docking holes 1 26, the base frame 24 is provided with a hole body 210, and the positioning block 211 is provided with a beveled hole 213.

[0059] The above structure facilitates docking.

[0060] Specifically, the top of the docking block 27 is provided with a positioning groove, the positioning block 211 is engaged with the positioning groove, and the side of the cross frame 35 is provided with an inclined surface.

[0061] With the above structure, the crossbar 35 can pass through the hole 210, and the inclined surface on the crossbar 35 can press the inclined hole 213 on the positioning block 211.

[0062] Specifically, a horizontal hole 36 is provided on the top of the side frame 32, and the push frame 34 is slidably installed in the horizontal hole 36. The side of the push frame 34 contacts the second docking block 38. A second docking hole 37 is provided on the side frame 32, and the second docking block 38 is engaged with the second docking hole 37.

[0063] The above structure facilitates the docking of the second docking block 38 with the side frame 32. The horizontal hole 36 facilitates the lateral movement of the push frame 34, which can push the second docking block 38 to move.

[0064] Working principle:

[0065] Polyester filament core yarns are pre-wound onto core yarn roll 1 28 and core yarn roll 2 39, respectively, and are locked and limited by docking blocks 1 27 and 2 38. In the initial state, the fully loaded core yarn roll 1 28 is assembled between turntable 1 25 and turntable 2 29. Core yarn roll 2 39 is pre-stored in docking hole 2 37 of the side frame 32 of the changing mechanism 3. Multiple sets of guide rollers 4 are arranged along the line on the frame 1 to guide and limit the output core yarn, ensuring that the core yarn is straight and conveyed to the jet vortex spinning nozzle to complete the wrapping spinning.

[0066] During normal spinning and feeding operations, servo motor 23 is started. Servo motor 23 is fixed to connecting frame 22 and drives the lower base frame 24 to rotate at a constant speed. The base frame 24 drives turntable 25 to rotate synchronously. The docking block 27 is installed in the docking hole 26 of turntable 25. The positioning block 211 is pressed down by spring 212 and locked into the positioning groove at the top of the docking block 27, so that the docking block 27 is axially locked and there is no axial movement. Turntable 25 drives the core yarn roll 28 to be unwound synchronously through docking block 27. The docking block 27 at the lower end of the core yarn roll 28 is engaged with turntable 29. Turntable 29 rotates synchronously with the core yarn roll to ensure that the two ends of the core yarn roll are stressed at the same time and the unwinding is stable. The released polyester core yarn is guided and constrained by each set of guide rollers 4 in sequence and is stably and accurately transported to the vortex spinning station to complete continuous coating spinning.

[0067] When the core wire on core wire roll 28 is exhausted, the device triggers an automatic roll changing process: First, the servo motor 31 of the changing mechanism 3 is started. The servo motor 31 drives the side frame 32 to rotate and align, so that the side frame 32 is aligned with the hole 210 of the base frame 24. Then, the electric telescopic rod 33 is started to extend forward. The electric telescopic rod 33 drives the pusher 34 to slide forward laterally along the horizontal hole 36 of the side frame 32. The pusher 34 simultaneously drives the cross frame 35 to move forward. The inclined surface of the cross frame 35 passes through the hole 210 and presses the inclined hole 213 of the positioning block 211. The inclined surface push force overcomes the elastic force of the spring 212 and pushes the positioning block 211 upward. The positioning block 211 disengages from the top positioning groove of the docking block 27 and releases the axial lock on the original core wire roll 28.

[0068] The electric telescopic rod 33 extends continuously, and the front end of the pusher 34 presses against the second docking block 38, pushing the pre-stored core wire roll 39 in the second docking hole 37 of the side frame 32, together with the second docking block 38, forward. During the process of pushing the second docking block 38 into the first docking hole 26 of the turntable 25, the used-up second docking block 27 and the empty core wire roll 28 are pushed outward, completing the replacement of the old and new core wire rolls. After the replacement is in place, the electric telescopic rod 33 drives the push frame 34 and the cross frame 35 to retract and reset synchronously. The cross frame 35 separates from the positioning block 211, and the spring 212 elastically resets and presses down on the positioning block 211. The positioning block 211 is re-engaged into the positioning groove of the new docking block 38, thus locking and fixing the new core yarn roll 39. The servo motor 31 drives the side frame 32 to rotate and avoid, and the servo motor 23 continuously drives the new core yarn roll to unwind. The core yarn is continuously fed into the spinning equipment through the guide roller 4. The entire roll changing process does not require manual disassembly and assembly of the roll, and the equipment does not need to be stopped for a long time, ensuring continuous and stable production of polyester core-spun yarn.

[0069] The foregoing has provided a detailed description of the precise core yarn feeding device for polyester core-spun yarn provided by the present invention. Specific embodiments have been used to illustrate the principles and implementation methods of the present invention. The descriptions of these embodiments are merely for the purpose of helping to understand the method and core ideas of the present invention. It should be noted that those skilled in the art can make various improvements and modifications to the present invention without departing from its principles, and these improvements and modifications also fall within the protection scope of the claims of the present invention.

Claims

1. A device for precisely feeding core yarns into polyester core-spun yarn, characterized in that, include: The frame (1) is provided with a core yarn unwinding mechanism (2) and a replacement mechanism (3). The core yarn unwinding mechanism (2) includes a top frame (21), a connecting frame (22), a servo motor (23), a base frame (24), a turntable (25), a docking block (27), a core yarn roll (28), and a turntable (29). The bottom of the top frame (21) is fixedly connected to the connecting frame (22), the first servo motor (23) is fixedly installed on the connecting frame (22), the output end of the first servo motor (23) is fixedly connected to the base frame (24), the bottom of the base frame (24) is fixedly connected to the first turntable (25), the first docking block (27) is fixedly connected to the first core wire roll (28), the second turntable (29) is rotatably installed on the frame (1), and the two docking blocks (27) are respectively engaged with the first turntable (25) and the second turntable (29); The core yarn unwinding mechanism (2) is used in conjunction with the changing mechanism (3).

2. The precise feeding device for core yarn of polyester core-spun yarn according to claim 1, characterized in that, The core yarn unwinding mechanism (2) also includes a positioning block (211) and a spring (212). The positioning block (211) is vertically slidably mounted on the turntable (25). The positioning block (211) is engaged with the upper docking block (27). The spring (212) is fixedly mounted between the positioning block (211) and the base frame (24).

3. The precise feeding device for core yarn of polyester core-spun yarn according to claim 1, characterized in that, The replacement mechanism (3) includes a second servo motor (31), a side frame (32), an electric telescopic rod (33), a push frame (34), a cross frame (35), a second docking block (38), and a second core wire roll (39). The second servo motor (31) is fixedly installed on the frame (1). The output end of the second servo motor (31) is fixedly connected to the side frame (32). The electric telescopic rod (33) is fixedly installed on the side frame (32). The output end of the electric telescopic rod (33) is fixedly connected to the push frame (34). The cross frame (35) is fixedly installed on the push frame (34). The second docking block (38) is engaged with the side frame (32). The second core wire roll (39) is fixedly connected to the second docking block (38).

4. The precise feeding device for core yarn of polyester core-spun yarn according to claim 1, characterized in that, Multiple guide rollers (4) are rotatably connected to the frame (1).

5. The precise feeding device for core yarn of polyester core-spun yarn according to claim 1, characterized in that, Both turntable one (25) and turntable two (29) are provided with docking hole one (26), and docking block one (27) is engaged with docking hole one (26).

6. The precise feeding device for core yarn of polyester core-spun yarn according to claim 1, characterized in that, The base frame (24) has a hole (210).

7. The precise feeding device for core yarn of polyester core-spun yarn according to claim 2, characterized in that, The positioning block (211) has a beveled hole (213).

8. The precise feeding device for core yarn of polyester core-spun yarn according to claim 2, characterized in that, The top of the docking block (27) is provided with a positioning groove, and the positioning block (211) is engaged with the positioning groove.

9. A precise feeding device for core yarn in polyester core-spun yarn according to claim 3, characterized in that, The crossbar (35) has an inclined surface on its side.

10. A precise feeding device for core yarn in polyester core-spun yarn according to claim 3, characterized in that, The side frame (32) has a horizontal hole (36) at the top. The push frame (34) is slidably installed in the horizontal hole (36). The side of the push frame (34) is in contact with the second docking block (38). The side frame (32) has a second docking hole (37). The second docking block (38) is engaged with the second docking hole (37).

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