A tension adjustment device for four-fold twist of chemical fiber and a four-fold twist spindle of chemical fiber.

Abstract

This invention discloses a tension regulating device for four-fold twisted synthetic fibers. The tension regulating device includes a vertically arranged fixed tube with a spindle shaft inserted into its upper opening. A vertically arranged tension regulating tube is fixed to the upper part of the spindle shaft. The tension regulating tube has a guide channel inside, containing a tension ball seat and a tension ball. The upper part of the tension regulating tube has a yarn outlet communicating with the upper part of the guide channel, and the lower part of the tension regulating tube has a yarn inlet communicating with the lower part of the guide channel and located below the tension ball seat. A tube cap is provided on the upper part of the tension regulating tube, with a recessed groove protruding from its upper end face. A through hole is located in the center of the recessed groove, and a guide tube is located at the opening of the recessed groove, sequentially communicating with the through hole and the guide channel. The guide tube and the recessed groove are rotatably connected via bearings. This invention provides a simple structure for a four-fold twisted synthetic fiber tension regulating device that minimizes yarn jump at the yarn outlet.

Description

Technical Field

[0001] This invention relates to a tension regulating device, and more particularly to a tension regulating device for four-fold twist of chemical fibers on a loom.

[0002] This invention relates to a spindle, and more particularly to a chemical fiber four-fold twist spindle. Background Technology

[0003] In the twisting process of synthetic fiber filaments, higher twisting is often preferred, meaning a larger twist value is added. Currently, the commonly used double-twist machine adds two twists per spindle rotation, commonly known as double twisting. Therefore, there is a desire for machines with even higher twisting efficiency, and four-fold twisting is one such example. However, in the specific use or operation of a four-fold twisting spindle, the tension of its air ring must be adjusted and controlled; otherwise, normal production is impossible. Because the structure and yarn path of a four-fold twisting spindle differ significantly from traditional double-twist spindles, its tension adjustment device must be adapted to these unique characteristics. In other words, the tension adjustment device and the four-fold twisting spindle must be combined to form a complete four-fold twisting machine. For example, Chinese Patent Publication No. CN221822427U, published on October 11, 2024, discloses a four-fold twisting spindle for synthetic fiber filaments, which presents a structure where the existing four-fold twisting spindle and tension adjustment device are separately configured.

[0004] Meanwhile, in the existing field of looms, no technical inspiration or corresponding solution has been provided on how to combine the tension adjustment device of the four-twist spindle with the four-twist spindle. Summary of the Invention

[0005] To overcome the shortcomings of the prior art, the present invention provides a tension adjustment device for four-fold twist of chemical fiber with a simple structure that can minimize yarn jumping at the yarn exit.

[0006] The technical solution adopted by the present invention to solve its technical problem is: a tension adjustment device for four-fold twist of chemical fiber, the tension adjustment device includes a vertically arranged fixed tube, a liner shaft is inserted into the upper opening of the fixed tube, the liner shaft and the fixed tube form a radial fixed and circumferential rotational fit, and a vertically arranged tension adjustment tube is fixed on the upper part of the liner shaft. The tension regulating tube has a guide wire channel arranged vertically inside. The guide wire channel has one or more tension ball seats and tension balls that can be placed at the tension ball seats. The upper part of the tension regulating tube has a yarn outlet that is connected to the upper part of the guide wire channel, and the lower part of the tension regulating tube has a yarn inlet that is connected to the lower part of the guide wire channel and located below the tension ball seats. The tension regulating tube is provided with a tube cover at the upper opening. The upper end face of the tube cover is provided with a sinking groove. The center of the sinking groove is provided with a through hole that communicates with the guide wire channel. The sinking groove is provided with a guide wire tube that communicates with the through hole and the guide wire channel in sequence. The guide wire tube and the sinking groove are rotated together by bearings.

[0007] The beneficial effects of this invention are as follows: The tension adjusting device, through the combination of a fixed tube and a tension adjusting tube, applies pressure to the yarn passing through the guide tube via tension balls. The tension on the yarn is changed by adjusting the number and material characteristics of the tension balls. The position of the guide hole on the spacer ring connected to the turntable allows the yarn passing through the guide hole to be relatively far away from the yarn inlet of the tension adjusting tube, thereby avoiding interference between the two yarns during the doubling process. Compared with the existing tension adjusting device for four-fold twist spindles, this invention has a simpler structure, more convenient tension adjustment, and a wider range of applications. The guide tube rotates within the sinker via a rotating shaft. Therefore, when the yarn passes through the yarn outlet and contacts the guide tube opening, the friction between the guide tube and the sinker is very small, causing the guide tube to rotate under the drive of the yarn. This dissipates the force on the yarn, preventing yarn jumps, improving yarn stability, and preventing yarn jumps from affecting the loom's operation.

[0008] A further feature is provided: the upper opening of the guide tube is provided with an outwardly extending yarn support plate, the edge of which is bent downward to form a smooth curved surface. The yarn support plate and the smooth curved surface reduce friction when the yarn passes through, while ensuring yarn stability.

[0009] The further configuration includes a turntable fitted onto and fixed to the tension regulating tube, a yarn separator ring located below and coaxially arranged with the turntable, the diameter of the yarn separator ring being larger than the diameter of the turntable, a connecting rod for fixing the yarn separator ring and the turntable together, and a yarn guide hole for the yarn to pass through. The yarn separator ring guides the yarn away from the yarn inlet, preventing interference between the yarns at the two locations.

[0010] The device is further configured to include an annular counterweight. A boss is protruding from the outer wall of the tension regulating tube, circumferentially surrounding the tube. The counterweight is fitted onto the tension regulating tube and rests on the boss. The counterweight increases the weight, thereby increasing the damping effect during rotation.

[0011] The design is further configured such that: a support lug protrudes from the peripheral wall of the liner shaft to press against the upper end face of the fixed tube; a recessed damping groove is provided on the upper end face of the fixed tube at a position corresponding to the support lug; a damping plate for contacting the support lug and the damping groove is placed in the damping groove; and several protrusions are provided on both sides of the damping plate. The damping plate allows for adjustment of operational stability and prevention of rotational angle deviation. By changing the material of the damping plate or the size of the protrusions on both sides, the damping force during liner shaft rotation can be altered, thus enabling its application in various environments.

[0012] A further feature is provided: a bearing is installed between the liner shaft and the inner wall of the fixed tube. This reduces the resistance during the rotation of the liner shaft, improves the stability during rotation, and avoids angular deviations during rotation.

[0013] In order to overcome the shortcomings of the prior art, the present invention provides a chemical fiber four-fold twist spindle with a simple structure that can minimize yarn jumping at the yarn exit.

[0014] The technical solution adopted by the present invention to solve its technical problem is: a chemical fiber four-fold twist spindle, characterized in that: it includes a yarn feeding bobbin, a spindle cup and a tension adjusting device, the tension adjusting device adopts the aforementioned tension adjusting device, and the tension adjusting device is inserted into the tube opening at the upper part of the yarn feeding bobbin through the lower part of the fixed tube.

[0015] The beneficial effects of this invention are as follows: The tension adjusting device, through the combination of a fixed tube and a tension adjusting tube, applies pressure to the yarn passing through the guide tube via tension balls. The tension on the yarn is changed by adjusting the number and material characteristics of the tension balls. The position of the guide hole on the spacer ring connected to the turntable allows the yarn passing through the guide hole to be relatively far away from the yarn inlet of the tension adjusting tube, thereby avoiding interference between the two yarns during the doubling process. Compared with the existing tension adjusting device for four-fold twist spindles, this invention has a simpler structure, more convenient tension adjustment, and a wider range of applications. The guide tube rotates within the sinker via a rotating shaft. Therefore, when the yarn passes through the yarn outlet and contacts the guide tube opening, the friction between the guide tube and the sinker is very small, causing the guide tube to rotate under the drive of the yarn. This dissipates the force on the yarn, preventing yarn jumps, improving yarn stability, and preventing yarn jumps from affecting the loom's operation. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of Embodiment 1 of the present invention.

[0017] Figure 2 for Figure 1 Enlarged view of part A.

[0018] Figure 3 This is a schematic diagram of the assembly of the tube cap and the guide wire tube in Embodiment 1 of the present invention.

[0019] Figure 4 This is a schematic diagram of the assembly of the guide tube and the wire support plate in Embodiment 1 of the present invention.

[0020] Figure 5 This is a schematic diagram of the structure of the turntable, connecting rod, and spacer ring in Embodiment 1 of the present invention.

[0021] Figure 6 This is a schematic diagram of the structure of Embodiment 2 of the present invention. Detailed Implementation

[0022] The present invention will now be further described with reference to the accompanying drawings: Example 1: As Figures 1-5 As shown, this embodiment is a tension adjusting device A. The tension adjusting device A includes a vertically arranged fixed tube 1. A liner shaft 2 is inserted into the upper opening of the fixed tube 1. The liner shaft 2 and the fixed tube 1 form a radially fixed and circumferentially rotating fit. A bearing 3 is provided between the liner shaft 2 and the inner wall of the fixed tube 1, and the two achieve circumferential rotation with almost no friction between them through the bearing. A vertically arranged tension adjusting tube 6 is fixed to the upper part of the liner shaft 2. The tension adjusting tube 6 has a guide yarn channel 61 arranged vertically inside. One or more tension ball seats 13 are provided in the guide yarn channel 61, and tension balls 14 can be placed in the tension ball seats 13. The upper part of the tension adjusting tube 6 has a yarn outlet 611 that communicates with the upper part of the guide yarn channel 61, and the lower part of the tension adjusting tube 6 has a yarn inlet 612 that communicates with the lower part of the guide yarn channel 61 and is located below the tension ball seats 13. A cap 9 is provided at the upper opening of the tension regulating tube 6. The tension regulating tube 6 has external threads, and the cap 9 has internal threads, thus securing them together. A recessed groove 91 protrudes from the upper end face of the cap 9. A through hole communicating with the wire guide channel 61 is located in the center of the recessed groove 91. A vertically arranged wire guide tube 11 is installed inside the recessed groove 91. The wire guide tube 11 and the inner wall of the recessed groove 91 are connected by a bearing 92. The lower opening of the wire guide tube 11 is connected to the through hole and the wire guide channel 61 in sequence. A wire support plate 111, extending outwards, is located at the upper opening of the wire guide tube 11. The edge of the wire support plate 111 is bent downwards to form a smooth curved surface. The upper part of the liner shaft 2 has external threads, while the lower part of the tension regulating tube 6 has internal threads. The tension regulating tube 6 and the liner shaft 2 are fixedly connected by these threads. In this embodiment, a turntable 5 is also included. The turntable 5 has a central opening and is fitted onto the tension regulating tube 6, sandwiched between the tension regulating tube 6 and the spindle shaft 2, thus fixing the three together. Below the turntable 5, a spacer ring 51 is coaxially arranged with the turntable 5. The diameter of the spacer ring 51 is larger than the diameter of the turntable 5. A connecting rod 52 is provided between the spacer ring 51 and the turntable 5 to fix them together. The spacer ring 51 has a guide hole 53 for the yarn to pass through. When the spindle starts, the turntable 5 can separate the unwinding yarn from the air coil yarn.

[0023] In this embodiment, a boss 62 is provided on the outer wall of the tension regulating tube 6, circumferentially surrounding the tension regulating tube 6. This boss 62 can be used to place a counterweight 8. The counterweight 8 has a ring structure and is fitted onto the tension regulating tube 6, resting precisely on the boss 62. Simultaneously, a support ear 21 is provided on the peripheral wall of the liner shaft 2 for pressing against the upper end face of the fixed tube 1. A recessed damping groove 22 is provided on the upper end face of the fixed tube 1 at a position corresponding to the support ear 21. A damping plate 4 is placed in the damping groove 22 for contacting the support ear 21 and the damping groove 22. Different sized bosses can be provided on both sides of the damping plate 4; different bosses on the damping plate 4 will produce different damping effects upon rotational contact.

[0024] In this embodiment, tension adjustment is achieved through three aspects: 1. The size and quantity of tension balls 14 can vary, allowing for 5-6 different specifications and numbers to apply different forces to the diameter of the spring wire inside the guide wire channel 61. 2. By changing the size of the damping plate 4 or the protrusions on its two sides, thus altering the friction force, the operation of the liner turntable 2 is changed. Multiple specifications of the damping plate 4 are available. 3. The overall rotation is adjusted by increasing or decreasing the number of counterweights 8 according to process requirements, thus meeting the process specifications.

[0025] Example 2: Figure 6 As shown, this embodiment includes a wire feed cylinder B, a spindle cup C, and a tension adjustment device A. The tension adjustment device A adopts the tension adjustment device in Embodiment 1. The tension adjustment device A is inserted into the tube opening at the upper part of the wire feed cylinder B through the lower part of the fixing tube 1.

[0026] In this embodiment, the wire feed bobbin B and spindle cup C can be referenced to Chinese Patent No. CN221822427U. The structure and function of the wire feed bobbin B and spindle cup C disclosed in that patent are consistent with those disclosed in this embodiment, and therefore will not be repeated. This ensures that those skilled in the art can understand the structure of the wire feed bobbin B and spindle cup C in this embodiment, as well as their assembly with the tension adjusting device A. Regarding the working principles of the wire feed bobbin B, spindle cup C, and tension adjusting device A, please refer to the patent No. CN221822427U disclosed in the background; therefore, they will not be repeated in this embodiment.

[0027] During operation, the tension of the yarn changes due to variations in the thickness of the yarn and the different unwinding states of the yarn feed bobbin B. For example, different spindle speeds result in different yarn tensions, and the yarn tension differs between a full bobbin and a nearly empty bobbin, as well as between the upper and lower ends of the unwinding bobbin. Therefore, the tension adjustment device A in this embodiment controls the yarn tension during the twisting process of the four-fold twist spindle.

Claims

1. A tension adjusting device for four-fold twist of chemical fiber, characterized in that: The tension adjustment device includes a vertically arranged fixed tube, with a liner shaft inserted into the upper opening of the fixed tube. The liner shaft and the fixed tube form a radially fixed and circumferentially rotating fit. The upper part of the liner shaft is fixed with a vertically arranged tension adjustment tube. The tension regulating tube has a guide wire channel arranged vertically inside. The guide wire channel has one or more tension ball seats and tension balls that can be placed at the tension ball seats. The upper part of the tension regulating tube has a yarn outlet that is connected to the upper part of the guide wire channel, and the lower part of the tension regulating tube has a yarn inlet that is connected to the lower part of the guide wire channel and located below the tension ball seats. The tension regulating tube is provided with a tube cover at the upper opening. The upper end face of the tube cover is provided with a sinking groove. The center of the sinking groove is provided with a through hole that communicates with the guide wire channel. The sinking groove is provided with a guide wire tube that communicates with the through hole and the guide wire channel in sequence. The guide wire tube and the sinking groove are rotated together by bearings. It also includes a turntable sleeved on and fixed to the tension regulating tube, a wire separator ring located below the turntable and coaxially arranged with the turntable, the diameter of the wire separator ring being larger than the diameter of the turntable, a connecting rod for fixing the wire separator ring and the turntable between the wire separator ring and the turntable, and a guide hole for yarn to pass through on the wire separator ring.

2. The tension adjusting device for four-fold twist of chemical fiber according to claim 1, characterized in that: The upper opening of the guide tube is provided with a wire support plate that extends outward, and the edge of the wire support plate is bent downward to form a smooth curved surface.

3. The tension adjusting device for four-fold twisted chemical fibers according to claim 1, characterized in that: It also includes a ring-shaped counterweight. The outer wall of the tension regulating tube is provided with a boss that surrounds the circumference of the tension regulating tube. The counterweight is sleeved on the tension regulating tube and its bottom is supported on the boss.

4. The tension adjusting device for four-fold twisted chemical fibers according to claim 1 or 3, characterized in that: The peripheral wall of the liner shaft is provided with a support ear for pressing against the upper end face of the fixed tube. The upper end face of the fixed tube is provided with a recessed damping groove at a position corresponding to the support ear. A damping plate for contacting the support ear and the damping groove is placed in the damping groove. Several protrusions are provided on both sides of the damping plate.

5. The tension adjusting device for four-fold twisted chemical fibers according to claim 1, characterized in that: A bearing is provided between the liner shaft and the inner wall of the fixed tube.

6. A chemical fiber four-fold twist spindle, characterized in that: It includes a wire feed cylinder, a spindle cup, and a tension adjusting device. The tension adjusting device is the tension adjusting device described in any one of claims 1-5. The tension adjusting device is inserted into the opening of the upper part of the wire feed cylinder through the lower part of the fixed tube.

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