A constant tension control device and control method for textile yarn

Abstract

A constant tension control device and control method for textile yarn, including a tensioning box and yarn arranged through the tensioning box, wherein a tensioning device and a buffer device arranged in sequence along the yarn transmission direction are provided in the tensioning box, the tensioning device including a first fixed wheel and a first moving wheel, the yarn is located between the first fixed wheel and the first moving wheel, and the first moving wheel is provided with an adjustment mechanism for adjusting the distance between the first moving wheel and the first fixed wheel; the buffer device includes a second moving wheel and a support rod for supporting the height of the second moving wheel, the yarn is wound on the second moving wheel, and a buffer spring is connected to the bottom of the support rod; compared with the prior art, the present invention adopts a purely mechanical structure and does not require power supply. At the same time, the equipment has only a small number of structural parts and no electronic components. The structure is simple, thereby saving a lot of costs.

Description

Technical Field

[0001] The present invention relates to the field of textile technology, and in particular to a constant tension control device and a control method for textile yarns. Background Art

[0002] With the continuous development of society and scientific advancement, the textile industry is also evolving. Yarn is a textile made from various textile fibers processed into products of a certain fineness. It is used in weaving, rope making, thread making, knitting, and embroidery. It can be categorized into staple yarn and continuous filament yarn. Wool yarn is commonly used to make sweaters, woolen trousers, woolen vests, scarves, hats, and gloves, as well as various clothing items in spring and autumn. Besides providing warmth, it also offers decorative effects. When yarn is woven into fabric, a tensioning mechanism is required to ensure uniformity and smoothness. Existing yarn tension control devices utilize an auxiliary motor to feed the yarn. The system dynamically detects the yarn tension during operation and adjusts the motor speed to maintain stable yarn tension. Specifically, the auxiliary motor feeds the yarn. During operation, if excessive yarn tension is detected, the auxiliary motor accelerates yarn feeding until the tension gradually reaches the rated value. Conversely, if the tension is too low, the auxiliary motor decelerates yarn feeding until the tension gradually reaches the rated value. This dynamic control method maintains stable yarn tension.

[0003] Chinese patent application number 201520151567.9 discloses a constant tension control device for a computer knitting hosiery machine. The above-mentioned constant tension control device includes a bracket, a cylinder and a rotating frame hinged on the bracket. The bracket is provided with a rubber roller. A bearing is connected to one end of the rotating frame. The other end of the rotating frame is a lifting end and abuts against the push rod of the cylinder. The rotating frame is connected to the bracket through a hinge shaft. A spring is provided on the hinge shaft. One end of the spring abuts against the lifting end of the rotating frame. The lifting end is subjected to the elastic force of the spring in a direction opposite to the force applied by the push rod. Under the action of the spring, the lifting end has a tendency to swing upward, so that the bearing can abut against the roller surface of the rubber roller. The rotating frame also has a pressing end. When the push rod descends, the pressing end abuts against the bracket. Chinese patent application number 201921531656.0 discloses a yarn production tensioning mechanism that can ensure constant tension. A tensioning box is fixed to one end of the top of the tensioning mechanism disclosed above, and a control panel is installed on one side of the tensioning box. A movable roller is provided on one side of the tensioning box. A fixed roller is fixed to the interior of the tensioning box above the movable roller via a bracket. Threaded screws are provided at both ends of the other side of the tensioning box. A servo motor is fixed to the top of the tensioning box. The output end of the servo motor is connected to two threaded screws via a pulley mechanism. A take-up reel is fixed to the other end of the top of the base plate. This utility model is equipped with a tensioning box, a movable roller, a fixed roller, a servo motor, a pulley mechanism, a threaded screw, a drive block, a straightening roller, and a wire groove. The yarn passes between the fixed roller and the movable roller, which facilitates the initial compression of the yarn.

[0004] The two yarn tension constant devices disclosed above control the yarn tension through the cooperation of multiple electronic devices. The overall device structure is complicated and has many electronic components. During actual use, the control method of each electronic component needs to be programmed, resulting in complex control methods and high technical requirements.

[0005] During the adjustment process, the yarn tension is adjusted by dynamically adjusting the motor speed. When it is detected that the yarn tension is too large, the motor accelerates the yarn feeding until the tension gradually reaches the rated value. Conversely, when the tension is too low, the motor decelerates the yarn feeding until the tension gradually reaches the rated value. In this dynamic adjustment process, the yarn transmission speed is increased by accelerating the motor, and there will be certain errors and delays. The yarn tension will fluctuate within a certain range, resulting in relatively large changes in yarn tension, poor tension stability, and difficulty in accurately controlling the yarn tension. Summary of the Invention

[0006] The present invention aims to overcome the above-mentioned defects in the prior art and provides a textile yarn constant tension control device and control method with simple structure and stable tension.

[0007] In order to achieve the above-mentioned purpose of the invention, the present invention adopts the following technical solutions: a constant tension control device for textile yarn, comprising a tensioning box and a yarn arranged through the tensioning box, the tensioning box is provided with a tensioning device and a buffer device arranged in sequence along the yarn transmission direction, the tensioning device comprises a first fixed wheel and a first moving wheel, the yarn is located between the first fixed wheel and the first moving wheel, and the first moving wheel is provided with an adjustment mechanism for adjusting the distance between the first moving wheel and the first fixed wheel; the buffer device comprises a second moving wheel and a support rod for supporting the height of the second moving wheel, the yarn is wound on the second moving wheel, and a buffer spring is connected to the bottom of the support rod.

[0008] As a preferred solution of the present invention, the adjustment mechanism includes a screw and a support frame, the first moving wheel is rotatably connected to the support frame, the screw is vertically arranged on the tensioning box, and the screw and the tensioning box are connected by threads, and the rotation of the screw drives the support frame to rise and fall.

[0009] As a preferred solution of the present invention, the screw is provided with a fine-tuning knob for rotating the screw, and a locking knob for fixing the screw is sleeved on the screw.

[0010] As a preferred solution of the present invention, a supporting spring connected to the screw rod is provided between the screw rod and the supporting frame, and the supporting spring is rotatably connected to the screw rod.

[0011] As a preferred solution of the present invention, a limit seat for horizontally limiting the support rod is formed in the tensioning box, the support rod partially passes through the limit seat and is connected to the second moving wheel, and the buffer spring is located in the limit seat.

[0012] As a preferred solution of the present invention, the tensioning box is provided with a second fixed wheel and a third fixed wheel for tensioning the yarn. The second fixed wheel and the third fixed wheel are respectively located on opposite sides of the limit seat, and the second fixed wheel and the third fixed wheel are rotatably connected to the tensioning box.

[0013] As a preferred solution of the present invention, a baffle for supporting a buffer spring is provided at the bottom of the limit seat, and a baffle buckle for fixing the baffle is provided on the outer wall of the tensioning box.

[0014] As a preferred solution of the present invention, a dynamometer connected to a buffer spring is provided at the bottom of the limit seat.

[0015] As a preferred solution of the present invention, a plurality of support pads for supporting the tensioning box are provided under the tensioning box.

[0016] A method for controlling constant tension of textile yarns, comprising the following steps:

[0017] S1. Zeroing the dynamometer: First, set the dynamometer to dynamic mode, then place the dynamometer under the buffer spring, align the dynamometer with the lower surface of the tension box, and return the dynamometer reading to zero;

[0018] S2. Pulley installation: First install the first fixed wheel, the third fixed wheel, and the second fixed wheel in the corresponding positions, then install the first moving wheel above the first fixed wheel, and install the second moving wheel between the third and second fixed wheels through the support rod;

[0019] S3, connecting the yarn: after passing the yarn through the first moving wheel and the first fixed wheel, it is wound around the third fixed wheel, the second moving wheel, and the second fixed wheel in sequence;

[0020] S4, loosening the tensioning device: rotating the locking knob and the fine-adjusting knob counterclockwise to move the first moving wheel upward, at which point the yarn is in contact only with the first fixed wheel;

[0021] S5. Setting the tension: Ensure that the yarn runs at a constant speed, then slowly adjust the fine-tuning knob in a clockwise direction. The first moving wheel moves downward, and the clamping force between the first moving wheel and the first fixed wheel on the yarn gradually increases, thereby increasing the tension of the yarn. The second moving wheel moves downward to compress the buffer spring. At this time, observe the value change of the dynamometer. When the value of the dynamometer rises to 2 times the required fixed value, stop adjusting, then tighten the locking knob, then remove the dynamometer, and insert the baffle through the baffle buckle. The tensioning device and the buffer device are in a relatively stable state.

[0022] S6. Setting completed: completing the setting of the yarn tension.

[0023] Compared with the prior art, the present invention has the following beneficial effects:

[0024] 1. The present invention adopts a purely mechanical structure and does not require power supply. At the same time, the equipment has only a small number of structural parts and no electronic components. The structure is simple, thus saving a lot of costs.

[0025] 2. The yarn tension is adjusted and locked by the tensioning device and the buffer device. The buffer device can detect the yarn tension while locking the yarn, thereby facilitating the adjustment of the tensioning device and the yarn tension. When the yarn speed is constant, the yarn tension can be adjusted by adjusting the pressure of the tensioning device on the yarn, so that the device control method is simple and the technical requirements are low. At the same time, the yarn tension can be monitored in real time through the buffer device, and the yarn pressure can be adjusted in real time through the tensioning device. The equipment structure is simple, and the yarn tension has only one pressure variable during the adjustment process. The sliding friction state of the yarn is more stable, which makes the tension fluctuation smaller and the stability higher. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a structural schematic diagram of the present invention;

[0027] Figure 2 It is a structural schematic diagram of the yarn tension setting of the present invention.

[0028] Figure numerals: fine-tuning knob 1, locking knob 2, screw 3, support spring 4, support frame 5, tensioning box 6, first moving wheel 7, support pad 8, first fixed wheel 9, third fixed wheel 10, yarn 11, second moving wheel 12, support rod 13, buffer spring 14, baffle 15, baffle buckle 16, second fixed wheel 17, limit seat 18, dynamometer 19. DETAILED DESCRIPTION

[0029] The embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0030] like Figure 1-Figure 2 As shown, a constant tension control device for textile yarn includes a tensioning box 6 and a yarn 11 arranged through the tensioning box 6. The tensioning box 6 is provided with a tensioning device and a buffer device arranged in sequence along the transmission direction of the yarn 11. The tensioning device includes a first fixed wheel 9 and a first moving wheel 7. The yarn 11 is located between the first fixed wheel 9 and the first moving wheel 7. The first moving wheel 7 is provided with an adjustment mechanism for adjusting the distance between the first moving wheel 7 and the first fixed wheel 9; the buffer device includes a second moving wheel 12 and a support rod 13 for supporting the height of the second moving wheel 12. The yarn 11 is wound on the second moving wheel 12, and a buffer spring 14 is connected to the bottom of the support rod 13.

[0031] The first fixed wheel 9 is rotatably connected to the tensioning box 6. The first fixed wheel 9 is installed in the tensioning box 6 through a fixing pin. The first moving wheel 7 is located above the first fixed wheel 9. The first moving wheel 7 is rotatably connected to the adjusting mechanism. The first moving wheel 7, the first fixed wheel 9 and the second moving wheel 12 rotate under the drive of the yarn 11.

[0032] The adjusting mechanism includes a screw 3 and a support frame 5. The first moving wheel 7 is rotatably connected to the support frame 5. The screw 3 is vertically arranged on the tensioning box 6, and the screw 3 and the tensioning box 6 are connected by threads. The rotation of the screw 3 drives the support frame 5 to rise and fall.

[0033] A fine external thread is formed on the screw rod 3 , through which a small movement of the screw rod 3 can be achieved, thereby achieving fine adjustment of the first moving wheel 7 up and down. In addition, the screw rod 3 extends upward to form a tensioning box 6 .

[0034] The screw rod 3 is provided with a fine-tuning knob 1 for rotating the screw rod 3 , and the screw rod 3 is sleeved with a locking knob 2 for fixing the screw rod 3 .

[0035] The fine-tuning knob 1 is arranged at the top end of the screw rod 3 , the locking knob 2 is in contact with the outer wall of the tensioning box 6 , and the locking knob 2 and the screw rod 3 are connected by threads.

[0036] A supporting spring 4 is provided between the screw rod 3 and the supporting frame 5 , and the supporting spring 4 is rotatably connected to the screw rod 3 .

[0037] The support spring 4 is rotatably connected to the screw rod 3 through a bearing. The support spring 4 is fixedly connected to the support frame 5. The support spring 4 is used to control the up and down movement of the first moving wheel 7 after the screw rod 3 is locked.

[0038] A limiting seat 18 for horizontally limiting the support rod 13 is formed in the tensioning box 6 . The support rod 13 partially passes through the limiting seat 18 and is connected to the second moving wheel 12 . The buffer spring 14 is located in the limiting seat 18 .

[0039] A through hole is formed on the limiting seat 18 , and the support rod 13 partially passes through the through hole of the limiting seat 18 and is connected to the second moving wheel 12 . The size of the buffer spring 14 is adapted to the inner size of the limiting seat 18 .

[0040] A second fixed wheel 17 and a third fixed wheel 10 for tensioning the yarn 11 are provided in the tensioning box 6. The second fixed wheel 17 and the third fixed wheel 10 are respectively located on opposite sides of the limiting seat 18. The second fixed wheel 17 and the third fixed wheel 10 are rotatably connected to the tensioning box 6.

[0041] The second fixed wheel 17 and the third fixed wheel 10 are symmetrically arranged about the limit seat 18, and the yarn 11 passes through the bottom of the second fixed wheel 17 and the third fixed wheel 10 respectively. The second fixed wheel 17 and the third fixed wheel 10 are respectively installed in the tensioning box 6 through fixing pins, and the second fixed wheel 17 and the third fixed wheel 10 rotate driven by the yarn 11.

[0042] A baffle 15 for supporting the buffer spring 14 is provided at the bottom of the limiting seat 18 , and a baffle buckle 16 for fixing the baffle 15 is provided on the outer wall of the tensioning box 6 .

[0043] The baffle 15 is clamped in the baffle buckle 16 , and the baffle 15 is used to support the buffer spring 14 .

[0044] A dynamometer 19 connected to the buffer spring 14 is provided at the bottom of the limiting seat 18 .

[0045] The dynamometer 19 is aligned with the lower surface of the tensioning box 6. The dynamometer 19 is used to detect the combined force of the second moving wheel 12, the support rod 13 and the buffer spring 14. The main parts of the dynamometer 19 are bent elastic steel sheets or spiral springs. When external force causes the elastic steel sheets or springs to deform, the pointer is driven to rotate through a transmission mechanism such as a lever. The position where the pointer stops on the dial is the value of the external force, which can be used to measure tension or pressure.

[0046] A plurality of support pads 8 for supporting the tensioning box 6 are provided under the tensioning box 6 .

[0047] A method for controlling constant tension of textile yarns, comprising the following steps:

[0048] S1. Return the dynamometer 19 to zero: first, set the dynamometer 19 to dynamic mode, then place the dynamometer 19 under the buffer spring 14, and align the dynamometer 19 with the lower surface of the tension box 6, and return the reading of the dynamometer 19 to zero;

[0049] The dynamometer 19 is set to dynamic mode to facilitate observation of the value changes of the dynamometer 19 when detecting the tension of the yarn 11. The dynamometer 19 is connected to the buffer spring 14, and the dynamometer 19 is aligned with the lower surface of the tensioning box 6 to prevent the dynamometer 19 from tilting and causing inaccurate measured values, thereby ensuring the accuracy of the detection.

[0050] S2. Pulley installation: First install the first fixed wheel 9, the third fixed wheel 10, and the second fixed wheel 17 in the corresponding positions, then install the first moving wheel 7 above the first fixed wheel 9, and install the second moving wheel 12 between the third fixed wheel 10 and the second fixed wheel 17 through the support rod 13;

[0051] The first fixed wheel 9 , the third fixed wheel 10 and the second fixed wheel 17 are rotatably connected relative to the tensioning box 6 , the first moving wheel 7 can move up and down relative to the first fixed wheel 9 , and the second moving wheel 12 can move up and down under the action of the support rod 13 and the buffer spring 14 .

[0052] S3, connecting yarn 11: After passing the yarn 11 through the first moving wheel 7 and the first fixed wheel 9, it is wound around the third fixed wheel 10, the second moving wheel 12, and the second fixed wheel 17 in sequence;

[0053] The yarn 11 passes through the middle of the first moving wheel 7 and the first fixed wheel 9 , and passes through the bottom of the second fixed wheel 17 and the third fixed wheel 10 respectively, and the yarn 11 passes around the top of the second moving wheel 12 .

[0054] S4. Release the tensioning device: rotate the locking knob 2 and the fine-tuning knob 1 counterclockwise to move the first moving wheel 7 upward. At this time, the yarn 11 is only in contact with the first fixed wheel 9.

[0055] After the yarn 11 is installed, the first moving wheel 7 is moved upward by adjusting the fine-tuning knob 1 so that the yarn 11 is not subjected to any force.

[0056] S5. Set the tension: Ensure that the yarn 11 runs at a constant speed, then slowly adjust the fine-tuning knob 1 in the clockwise direction. The first moving wheel 7 moves downward, and the clamping force between the first moving wheel 7 and the first fixed wheel 9 on the yarn 11 gradually increases, thereby increasing the tension of the yarn 11. The second moving wheel 12 moves downward, pressing the buffer spring 14. At this time, observe the value change of the dynamometer 19. When the value of the dynamometer 19 rises to twice the required fixed value, stop adjusting, then tighten the locking knob 2, then remove the dynamometer 19, and insert the baffle 15 through the baffle buckle 16. The tensioning device and the buffer device are in a relatively stable state.

[0057] By adjusting the fine-tuning knob 1, the first moving wheel 7 moves downward so that the yarn 11 is subjected to the clamping force of the first moving wheel 7 and the first fixed wheel 9. Since the pulling force of the movable pulley is twice the pulling force of the two lines on both sides, the value measured on the dynamometer 19 at this time is twice the tension of the yarn 11.

[0058] S6, setting completed: completing the setting of the tension of the yarn 11.

[0059] In actual use:

[0060] First, set the dynamometer 19 to dynamic mode, then place the dynamometer 19 under the buffer spring 14, and align the dynamometer 19 with the lower surface of the tensioning box 6, and reset the reading of the dynamometer 19 at this time to zero; then install the first fixed wheel 9, the third fixed wheel 10, and the second fixed wheel 17 in the corresponding positions, and then install the first moving wheel 7 above the first fixed wheel 9, and the second moving wheel 12 is installed between the third fixed wheel 10 and the second fixed wheel 17 through the support rod 13; then pass the yarn 11 through the first moving wheel 7 and the first fixed wheel 9, and then wind it around the third fixed wheel 10, the second moving wheel 12, and the second fixed wheel 17 in sequence; then rotate the locking knob 2 and the fine-tuning knob 1 counterclockwise to move the first moving wheel 7 upward. The yarn 11 is only in contact with the first fixed wheel 9; ensure that the yarn 11 runs at a uniform speed, then slowly adjust the fine-tuning knob 1 in the clockwise direction, the first moving wheel 7 moves downward, and the clamping force of the yarn 11 between the first moving wheel 7 and the first fixed wheel 9 gradually increases, thereby increasing the tension of the yarn 11, and the second moving wheel 12 moves downward to press the buffer spring 14. At this time, observe the value change of the dynamometer 19. When the value of the dynamometer 19 rises to 2 times the required set value, stop adjusting, then tighten the locking knob 2, and then remove the dynamometer 19, insert the baffle 15 through the baffle buckle 16, the tensioning device and the buffer device are in a relatively stable state, and the tension setting of the yarn 11 is completed at this time.

[0061] The above description of the disclosed embodiments will enable one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be readily apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not limited to the embodiments shown herein, but is to be embodied in the widest possible manner consistent with the principles and novel features disclosed herein.

[0062] Although this document frequently uses the following terms: fine-tuning knob 1, locking knob 2, screw 3, support spring 4, support frame 5, tensioning box 6, first moving wheel 7, support pad 8, first fixed wheel 9, third fixed wheel 10, yarn 11, second moving wheel 12, support rod 13, buffer spring 14, baffle 15, baffle buckle 16, second fixed wheel 17, limit seat 18, dynamometer 19, etc., the use of other terms is not excluded. These terms are used only to more conveniently describe and explain the essence of the present invention; interpreting them as any additional limitations is contrary to the spirit of the present invention.

Claims

1. A constant tension control device for textile yarn, comprising a tensioning box (6) and a yarn (11) arranged through the tensioning box (6), characterized in that: The tensioning box (6) is provided with a tensioning device and a buffer device which are sequentially arranged along the transmission direction of the yarn (11), the tensioning device comprises a first fixed wheel (9) and a first moving wheel (7), the yarn (11) is located between the first fixed wheel (9) and the first moving wheel (7), and the first moving wheel (7) is provided with an adjustment mechanism for adjusting the distance between the first moving wheel (7) and the first fixed wheel (9); the buffer device comprises a second moving wheel (12) and a support rod (13) for supporting the height of the second moving wheel (12), the yarn (11) is wound around the second moving wheel (12), and a buffer spring (14) is connected to the bottom of the support rod (13); the adjustment mechanism comprises a screw rod (3) and a support frame (5), the first moving wheel (7) is rotatably connected to the support frame (5), the screw rod (3) is vertically arranged on the tensioning box (6), and the screw rod (3) and the tensioning box (6) are in contact with each other. The screw rod (3) is connected by a thread, and the support frame (5) is driven to rise and fall by rotating the screw rod (3); a fine adjustment knob (1) for rotating the screw rod (3) is provided on the screw rod (3), and a locking knob (2) for fixing the screw rod (3) is sleeved on the screw rod (3); a fine-tooth external thread is formed on the screw rod (3); a limit seat (18) for horizontally limiting the support rod (13) is formed in the tensioning box (6), and the support rod (13) partially passes through the limit seat (18) and is connected to the second moving wheel (12), and the buffer spring (14) is located in the limit seat (18); a baffle (15) for supporting the buffer spring (14) is provided at the bottom of the limit seat (18), and a baffle buckle (16) for fixing the baffle (15) is provided on the outer wall of the tensioning box (6); a dynamometer (19) connected to the buffer spring (14) is provided at the bottom of the limit seat (18).

2. A constant tension control device for textile yarn according to claim 1, characterized in that: A supporting spring (4) is provided between the screw rod (3) and the supporting frame (5), and the supporting spring (4) is rotatably connected to the screw rod (3).

3. A constant tension control device for textile yarn according to claim 1, characterized in that: A second fixed wheel (17) and a third fixed wheel (10) for tensioning the yarn (11) are provided in the tensioning box (6); the second fixed wheel (17) and the third fixed wheel (10) are respectively located on opposite sides of the limiting seat (18); the second fixed wheel (17) and the third fixed wheel (10) are rotatably connected to the tensioning box (6).

4. A constant tension control device for textile yarn according to claim 1, characterized in that: A plurality of support pads (8) for supporting the tensioning box (6) are provided under the tensioning box (6).

5. A method for controlling constant tension of textile yarn, applicable to the constant tension control device for textile yarn according to any one of claims 1 to 4, characterized in that: The following steps are involved: S1. Zeroing the dynamometer (19): First, set the dynamometer (19) to the dynamic mode, then place the dynamometer (19) below the buffer spring (14), and align the dynamometer (19) with the lower surface of the tension box (6), and then reset the reading of the dynamometer (19) to zero; S2. Pulley installation: first install the first fixed wheel (9), the third fixed wheel (10), and the second fixed wheel (17) at the corresponding positions, then install the first moving wheel (7) above the first fixed wheel (9), and install the second moving wheel (12) between the third fixed wheel (10) and the second fixed wheel (17) through the support rod (13); S3, connecting the yarn (11): after passing the yarn (11) through the first moving wheel (7) and the first fixed wheel (9), the yarn (11) is wound around the third fixed wheel (10), the second moving wheel (12), and the second fixed wheel (17) in sequence; S4, loosening the tensioning device: rotating the locking knob (2) and the fine-tuning knob (1) counterclockwise to move the first moving wheel (7) upward, at which time the yarn (11) is in contact only with the first fixed wheel (9); S5. Setting the tension: ensuring that the yarn (11) runs at a uniform speed, then slowly adjusting the fine-tuning knob (1) in a clockwise direction, the first moving wheel (7) moves downward, and the clamping force between the first moving wheel (7) and the first fixed wheel (9) on the yarn (11) gradually increases, thereby increasing the tension of the yarn (11), the second moving wheel (12) moves downward, pressing the buffer spring (14), and observing the value change of the dynamometer (19). When the value of the dynamometer (19) rises to 2 times the required fixed value, stop adjusting, then tighten the locking knob (2), and then remove the dynamometer (19), insert the baffle (15) through the baffle buckle (16), and the tensioning device and the buffer device are in a relatively stable state; S6, setting completed: completing the setting of the tension of the yarn (11).

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